Merge topic branch 'hsi' into integration-linux-ux500-3.3

23 files changed, 6746 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index bd76394ccaf..b4b94ad97d2 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -189,6 +189,9 @@ ifneq ($(CONFIG_TIDSPBRIDGE),)
 obj-y					+= dsp.o
 endif
 
+omap-ssi-$(CONFIG_OMAP_SSI)		:= ssi.o
+obj-y					+= $(omap-ssi-m) $(omap-ssi-y)
+
 # Specific board support
 obj-$(CONFIG_MACH_OMAP_GENERIC)		+= board-generic.o
 obj-$(CONFIG_MACH_OMAP_H4)		+= board-h4.o
diff --git a/arch/arm/mach-omap2/ssi.c b/arch/arm/mach-omap2/ssi.c
new file mode 100644
index 00000000000..e822a77f5ca
--- /dev/null
+++ b/arch/arm/mach-omap2/ssi.c
@@ -0,0 +1,134 @@
+/*
+ * linux/arch/arm/mach-omap2/ssi.c
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <plat/omap-pm.h>
+#include <plat/ssi.h>
+
+static struct omap_ssi_platform_data ssi_pdata = {
+	.num_ports			= SSI_NUM_PORTS,
+	.get_dev_context_loss_count	= omap_pm_get_dev_context_loss_count,
+};
+
+static struct resource ssi_resources[] = {
+	/* SSI controller */
+	[0] = {
+		.start	= 0x48058000,
+		.end	= 0x48058fff,
+		.name	= "omap_ssi_sys",
+		.flags	= IORESOURCE_MEM,
+	},
+	/* GDD */
+	[1] = {
+		.start	= 0x48059000,
+		.end	= 0x48059fff,
+		.name	= "omap_ssi_gdd",
+		.flags	= IORESOURCE_MEM,
+	},
+	[2] = {
+		.start	= 71,
+		.end	= 71,
+		.name	= "ssi_gdd",
+		.flags	= IORESOURCE_IRQ,
+	},
+	/* SSI port 1 */
+	[3] = {
+		.start	= 0x4805a000,
+		.end	= 0x4805a7ff,
+		.name	= "omap_ssi_sst1",
+		.flags	= IORESOURCE_MEM,
+	},
+	[4] = {
+		.start	= 0x4805a800,
+		.end	= 0x4805afff,
+		.name	= "omap_ssi_ssr1",
+		.flags	= IORESOURCE_MEM,
+	},
+	[5] = {
+		.start	= 67,
+		.end	= 67,
+		.name	= "ssi_p1_mpu_irq0",
+		.flags	= IORESOURCE_IRQ,
+	},
+	[6] = {
+		.start	= 68,
+		.end	= 68,
+		.name	= "ssi_p1_mpu_irq1",
+		.flags	= IORESOURCE_IRQ,
+	},
+	[7] = {
+		.start	= 0,
+		.end	= 0,
+		.name	= "ssi_p1_cawake",
+		.flags	= IORESOURCE_IRQ | IORESOURCE_UNSET,
+	},
+};
+
+static struct platform_device ssi_pdev = {
+	.name		= "omap_ssi",
+	.id		= 0,
+	.num_resources	= ARRAY_SIZE(ssi_resources),
+	.resource	= ssi_resources,
+	.dev		= {
+				.platform_data	= &ssi_pdata,
+	},
+};
+
+int __init omap_ssi_config(struct omap_ssi_board_config *ssi_config)
+{
+	unsigned int port, offset, cawake_gpio;
+	int err;
+
+	ssi_pdata.num_ports = ssi_config->num_ports;
+	for (port = 0, offset = 7; port < ssi_config->num_ports;
+							port++, offset += 5) {
+		cawake_gpio = ssi_config->cawake_gpio[port];
+		if (!cawake_gpio)
+			continue; /* Nothing to do */
+		err = gpio_request(cawake_gpio, "cawake");
+		if (err < 0)
+			goto rback;
+		gpio_direction_input(cawake_gpio);
+		ssi_resources[offset].start = gpio_to_irq(cawake_gpio);
+		ssi_resources[offset].flags &= ~IORESOURCE_UNSET;
+		ssi_resources[offset].flags |= IORESOURCE_IRQ_HIGHEDGE |
+							IORESOURCE_IRQ_LOWEDGE;
+	}
+
+	return 0;
+rback:
+	dev_err(&ssi_pdev.dev, "Request cawake (gpio%d) failed\n", cawake_gpio);
+	while (port > 0)
+		gpio_free(ssi_config->cawake_gpio[--port]);
+
+	return err;
+}
+
+static int __init ssi_init(void)
+{
+	return platform_device_register(&ssi_pdev);
+}
+subsys_initcall(ssi_init);
diff --git a/arch/arm/mach-ux500/include/mach/hsi.h b/arch/arm/mach-ux500/include/mach/hsi.h
new file mode 100644
index 00000000000..58d33249cae
--- /dev/null
+++ b/arch/arm/mach-ux500/include/mach/hsi.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ */
+
+#ifndef __MACH_HSI_H
+#define __MACH_HSI_H
+
+#include <plat/ste_dma40.h>
+
+/* HSIT register offsets */
+#define STE_HSI_TX_ID                  0x000
+#define STE_HSI_TX_MODE                0x004
+#define STE_HSI_TX_STATE               0x008
+#define STE_HSI_TX_IOSTATE             0x00C
+#define STE_HSI_TX_BUFSTATE            0x010
+#define STE_HSI_TX_DIVISOR             0x014
+#define STE_HSI_TX_BREAK               0x01C
+#define STE_HSI_TX_CHANNELS            0x020
+#define STE_HSI_TX_FLUSHBITS           0x024
+#define STE_HSI_TX_PRIORITY            0x028
+#define STE_HSI_TX_STATICCONFID        0x02C
+#define STE_HSI_TX_DATASWAP            0x034
+#define STE_HSI_TX_FRAMELENX           0x080
+#define STE_HSI_TX_BUFFERX             0x0C0
+#define STE_HSI_TX_BASEX               0x100
+#define STE_HSI_TX_SPANX               0x140
+#define STE_HSI_TX_GAUGEX              0x180
+#define STE_HSI_TX_WATERMARKX          0x1C0
+#define STE_HSI_TX_DMAEN               0x200
+#define STE_HSI_TX_WATERMARKMIS        0x204
+#define STE_HSI_TX_WATERMARKIM         0x208
+#define STE_HSI_TX_WATERMARKIC         0x20C
+#define STE_HSI_TX_WATERMARKID         0x210
+#define STE_HSI_TX_WATERMARKIS         0x214
+#define STE_HSI_TX_PERIPHID0           0xFE0
+#define STE_HSI_TX_PERIPHID1           0xFE4
+#define STE_HSI_TX_PERIPHID2           0xFE8
+#define STE_HSI_TX_PERIPHID3           0xFEC
+
+/* HSIR register offsets */
+#define STE_HSI_RX_ID                  0x000
+#define STE_HSI_RX_MODE                0x004
+#define STE_HSI_RX_STATE               0x008
+#define STE_HSI_RX_BUFSTATE            0x00C
+#define STE_HSI_RX_THRESHOLD           0x010
+#define STE_HSI_RX_DETECTOR            0x018
+#define STE_HSI_RX_EXCEP               0x01C
+#define STE_HSI_RX_ACK                 0x020
+#define STE_HSI_RX_CHANNELS            0x024
+#define STE_HSI_RX_REALTIME            0x028
+#define STE_HSI_RX_OVERRUN             0x02C
+#define STE_HSI_RX_OVERRUNACK          0x030
+#define STE_HSI_RX_PREAMBLE            0x034
+#define STE_HSI_RX_PIPEGAUGE           0x038
+#define STE_HSI_RX_STATICCONFID        0x03C
+#define STE_HSI_RX_BUFFERX             0x080
+#define STE_HSI_RX_FRAMELENX           0x0C0
+#define STE_HSI_RX_BASEX               0x100
+#define STE_HSI_RX_SPANX               0x140
+#define STE_HSI_RX_GAUGEX              0x180
+#define STE_HSI_RX_WATERMARKX          0x1C0
+#define STE_HSI_RX_FRAMEBURSTCNT       0x1E0
+#define STE_HSI_RX_DMAEN               0x200
+#define STE_HSI_RX_WATERMARKMIS        0x204
+#define STE_HSI_RX_WATERMARKIM         0x208
+#define STE_HSI_RX_WATERMARKIC         0x20C
+#define STE_HSI_RX_WATERMARKID         0x210
+#define STE_HSI_RX_OVERRUNMIS          0x214
+#define STE_HSI_RX_OVERRUNIM           0x218
+#define STE_HSI_RX_EXCEPMIS            0x21C
+#define STE_HSI_RX_EXCEPIM             0x220
+#define STE_HSI_RX_WATERMARKIS         0x224
+#define STE_HSI_RX_PERIPHID0           0xFE0
+#define STE_HSI_RX_PERIPHID1           0xFE4
+#define STE_HSI_RX_PERIPHID2           0xFE8
+#define STE_HSI_RX_PERIPHID3           0xFEC
+
+/* HSI states */
+#define STE_HSI_STATE_IDLE             0x00
+#define STE_HSI_STATE_START            0x01
+#define STE_HSI_STATE_TRANSMIT         0x02
+#define STE_HSI_STATE_BREAK            0x03
+#define STE_HSI_STATE_FLUSH            0x04
+#define STE_HSI_STATE_HALT             0x05
+
+/* HSI exceptions */
+#define STE_HSI_EXCEP_TIMEOUT          0x01
+#define STE_HSI_EXCEP_OVERRUN          0x02
+#define STE_HSI_EXCEP_BREAK            0x04
+#define STE_HSI_EXCEP_PARITY           0x08
+
+/* HSI modes */
+#define STE_HSI_MODE_SLEEP             0x00
+#define STE_HSI_MODE_STREAM            0x01
+#define STE_HSI_MODE_FRAME             0x02
+#define STE_HSI_MODE_PIPELINED         0x03
+#define STE_HSI_MODE_FAILSAFE          0x04
+
+#define STE_HSI_MAX_BUFFERS            32
+
+/* Max channels of STE HSI controller */
+#define STE_HSI_MAX_CHANNELS           2
+
+#define STE_HSI_DMA_MAX_BURST          1
+
+struct stedma40_chan_cfg;
+
+struct ste_hsi_port_cfg {
+#ifdef CONFIG_STE_DMA40
+       bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
+       struct stedma40_chan_cfg *dma_tx_cfg;
+       struct stedma40_chan_cfg *dma_rx_cfg;
+#endif
+};
+
+struct ste_hsi_platform_data {
+       int num_ports;
+       int use_dma;
+       struct ste_hsi_port_cfg *port_cfg;
+};
+
+#endif
diff --git a/arch/arm/plat-omap/include/plat/ssi.h b/arch/arm/plat-omap/include/plat/ssi.h
new file mode 100644
index 00000000000..eb84c3a69f7
--- /dev/null
+++ b/arch/arm/plat-omap/include/plat/ssi.h
@@ -0,0 +1,204 @@
+/*
+ * plat/ssi.h
+ *
+ * Hardware definitions for SSI.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __OMAP_SSI_REGS_H__
+#define __OMAP_SSI_REGS_H__
+
+#define SSI_NUM_PORTS	1
+/*
+ * SSI SYS registers
+ */
+#define SSI_REVISION_REG		0
+#	define SSI_REV_MAJOR		0xf0
+#	define SSI_REV_MINOR		0xf
+#define SSI_SYSCONFIG_REG		0x10
+#	define SSI_AUTOIDLE		(1 << 0)
+#	define SSI_SOFTRESET		(1 << 1)
+#	define SSI_SIDLEMODE_FORCE	0
+#	define SSI_SIDLEMODE_NO		(1 << 3)
+#	define SSI_SIDLEMODE_SMART	(1 << 4)
+#	define SSI_SIDLEMODE_MASK	0x18
+#	define SSI_MIDLEMODE_FORCE	0
+#	define SSI_MIDLEMODE_NO		(1 << 12)
+#	define SSI_MIDLEMODE_SMART	(1 << 13)
+#	define SSI_MIDLEMODE_MASK	0x3000
+#define SSI_SYSSTATUS_REG		0x14
+#	define SSI_RESETDONE		1
+#define SSI_MPU_STATUS_REG(port, irq)	(0x808 + ((port) * 0x10) + ((irq) * 2))
+#define SSI_MPU_ENABLE_REG(port, irq)	(0x80c + ((port) * 0x10) + ((irq) * 8))
+#	define SSI_DATAACCEPT(channel)		(1 << (channel))
+#	define SSI_DATAAVAILABLE(channel)	(1 << ((channel) + 8))
+#	define SSI_DATAOVERRUN(channel)		(1 << ((channel) + 16))
+#	define SSI_ERROROCCURED			(1 << 24)
+#	define SSI_BREAKDETECTED		(1 << 25)
+#define SSI_GDD_MPU_IRQ_STATUS_REG	0x0800
+#define SSI_GDD_MPU_IRQ_ENABLE_REG	0x0804
+#	define SSI_GDD_LCH(channel)	(1 << (channel))
+#define SSI_WAKE_REG(port)		(0xc00 + ((port) * 0x10))
+#define SSI_CLEAR_WAKE_REG(port)	(0xc04 + ((port) * 0x10))
+#define SSI_SET_WAKE_REG(port)		(0xc08 + ((port) * 0x10))
+#	define SSI_WAKE(channel)	(1 << (channel))
+#	define SSI_WAKE_MASK		0xff
+
+/*
+ * SSI SST registers
+ */
+#define SSI_SST_ID_REG			0
+#define SSI_SST_MODE_REG		4
+#	define SSI_MODE_VAL_MASK	3
+#	define SSI_MODE_SLEEP		0
+#	define SSI_MODE_STREAM		1
+#	define SSI_MODE_FRAME		2
+#	define SSI_MODE_MULTIPOINTS	3
+#define SSI_SST_FRAMESIZE_REG		8
+#	define SSI_FRAMESIZE_DEFAULT	31
+#define SSI_SST_TXSTATE_REG		0xc
+#	define	SSI_TXSTATE_IDLE	0
+#define SSI_SST_BUFSTATE_REG		0x10
+#	define	SSI_FULL(channel)	(1 << (channel))
+#define SSI_SST_DIVISOR_REG		0x18
+#	define SSI_MAX_DIVISOR		127
+#define SSI_SST_BREAK_REG		0x20
+#define SSI_SST_CHANNELS_REG		0x24
+#	define SSI_CHANNELS_DEFAULT	4
+#define SSI_SST_ARBMODE_REG		0x28
+#	define SSI_ARBMODE_ROUNDROBIN	0
+#	define SSI_ARBMODE_PRIORITY	1
+#define SSI_SST_BUFFER_CH_REG(channel)	(0x80 + ((channel) * 4))
+#define SSI_SST_SWAPBUF_CH_REG(channel)	(0xc0 + ((channel) * 4))
+
+/*
+ * SSI SSR registers
+ */
+#define SSI_SSR_ID_REG			0
+#define SSI_SSR_MODE_REG		4
+#define SSI_SSR_FRAMESIZE_REG		8
+#define SSI_SSR_RXSTATE_REG		0xc
+#define SSI_SSR_BUFSTATE_REG		0x10
+#	define SSI_NOTEMPTY(channel)	(1 << (channel))
+#define SSI_SSR_BREAK_REG		0x1c
+#define SSI_SSR_ERROR_REG		0x20
+#define SSI_SSR_ERRORACK_REG		0x24
+#define SSI_SSR_OVERRUN_REG		0x2c
+#define SSI_SSR_OVERRUNACK_REG		0x30
+#define SSI_SSR_TIMEOUT_REG		0x34
+#	define SSI_TIMEOUT_DEFAULT	0
+#define SSI_SSR_CHANNELS_REG		0x28
+#define SSI_SSR_BUFFER_CH_REG(channel)	(0x80 + ((channel) * 4))
+#define SSI_SSR_SWAPBUF_CH_REG(channel)	(0xc0 + ((channel) * 4))
+
+/*
+ * SSI GDD registers
+ */
+#define SSI_GDD_HW_ID_REG		0
+#define SSI_GDD_PPORT_ID_REG		0x10
+#define SSI_GDD_MPORT_ID_REG		0x14
+#define SSI_GDD_PPORT_SR_REG		0x20
+#define SSI_GDD_MPORT_SR_REG		0x24
+#	define SSI_ACTIVE_LCH_NUM_MASK	0xff
+#define SSI_GDD_TEST_REG		0x40
+#	define SSI_TEST			1
+#define SSI_GDD_GCR_REG			0x100
+#	define	SSI_CLK_AUTOGATING_ON	(1 << 3)
+#	define	SSI_FREE		(1 << 2)
+#	define	SSI_SWITCH_OFF		(1 << 0)
+#define SSI_GDD_GRST_REG		0x200
+#	define SSI_SWRESET		1
+#define SSI_GDD_CSDP_REG(channel)	(0x800 + ((channel) * 0x40))
+#	define SSI_DST_BURST_EN_MASK	0xc000
+#	define SSI_DST_SINGLE_ACCESS0	0
+#	define SSI_DST_SINGLE_ACCESS	(1 << 14)
+#	define SSI_DST_BURST_4x32_BIT	(2 << 14)
+#	define SSI_DST_BURST_8x32_BIT	(3 << 14)
+#	define SSI_DST_MASK		0x1e00
+#	define SSI_DST_MEMORY_PORT	(8 << 9)
+#	define SSI_DST_PERIPHERAL_PORT	(9 << 9)
+#	define SSI_SRC_BURST_EN_MASK	0x180
+#	define SSI_SRC_SINGLE_ACCESS0	0
+#	define SSI_SRC_SINGLE_ACCESS	(1 << 7)
+#	define SSI_SRC_BURST_4x32_BIT	(2 << 7)
+#	define SSI_SRC_BURST_8x32_BIT	(3 << 7)
+#	define SSI_SRC_MASK		0x3c
+#	define SSI_SRC_MEMORY_PORT	(8 << 2)
+#	define SSI_SRC_PERIPHERAL_PORT	(9 << 2)
+#	define SSI_DATA_TYPE_MASK	3
+#	define SSI_DATA_TYPE_S32	2
+#define SSI_GDD_CCR_REG(channel)	(0x802 + ((channel) * 0x40))
+#	define SSI_DST_AMODE_MASK	(3 << 14)
+#	define SSI_DST_AMODE_CONST	0
+#	define SSI_DST_AMODE_POSTINC	(1 << 12)
+#	define SSI_SRC_AMODE_MASK	(3 << 12)
+#	define SSI_SRC_AMODE_CONST	0
+#	define SSI_SRC_AMODE_POSTINC	(1 << 12)
+#	define SSI_CCR_ENABLE		(1 << 7)
+#	define SSI_CCR_SYNC_MASK	0x1f
+#define SSI_GDD_CICR_REG(channel)	(0x804 + ((channel) * 0x40))
+#	define SSI_BLOCK_IE		(1 << 5)
+#	define SSI_HALF_IE		(1 << 2)
+#	define SSI_TOUT_IE		(1 << 0)
+#define SSI_GDD_CSR_REG(channel)	(0x806 + ((channel) * 0x40))
+#	define SSI_CSR_SYNC		(1 << 6)
+#	define SSI_CSR_BLOCK		(1 << 5)
+#	define SSI_CSR_HALF		(1 << 2)
+#	define SSI_CSR_TOUR		(1 << 0)
+#define SSI_GDD_CSSA_REG(channel)	(0x808 + ((channel) * 0x40))
+#define SSI_GDD_CDSA_REG(channel)	(0x80c + ((channel) * 0x40))
+#define SSI_GDD_CEN_REG(channel)	(0x810 + ((channel) * 0x40))
+#define SSI_GDD_CSAC_REG(channel)	(0x818 + ((channel) * 0x40))
+#define SSI_GDD_CDAC_REG(channel)	(0x81a + ((channel) * 0x40))
+#define SSI_GDD_CLNK_CTRL_REG(channel)	(0x828 + ((channel) * 0x40))
+#	define SSI_ENABLE_LNK		(1 << 15)
+#	define SSI_STOP_LNK		(1 << 14)
+#	define SSI_NEXT_CH_ID_MASK	0xf
+
+/**
+ * struct omap_ssi_platform_data - OMAP SSI platform data
+ * @num_ports: Number of ports on the controller
+ * @ctxt_loss_count: Pointer to omap_pm_get_dev_context_loss_count
+ */
+struct omap_ssi_platform_data {
+	unsigned int	num_ports;
+	int (*get_dev_context_loss_count)(struct device *dev);
+};
+
+/**
+ * struct omap_ssi_config - SSI board configuration
+ * @num_ports: Number of ports in use
+ * @cawake_line: Array of cawake gpio lines
+ */
+struct omap_ssi_board_config {
+	unsigned int num_ports;
+	int cawake_gpio[SSI_NUM_PORTS];
+};
+
+#ifdef CONFIG_OMAP_SSI_CONFIG
+extern int omap_ssi_config(struct omap_ssi_board_config *ssi_config);
+#else
+static inline int omap_ssi_config(struct omap_ssi_board_config *ssi_config)
+{
+	return 0;
+}
+#endif /* CONFIG_OMAP_SSI_CONFIG */
+
+#endif /* __OMAP_SSI_REGS_H__ */
diff --git a/drivers/Kconfig b/drivers/Kconfig
index be367428c1d..2101dea3534 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig"
 
 source "drivers/spi/Kconfig"
 
+source "drivers/hsi/Kconfig"
+
 source "drivers/pps/Kconfig"
 
 source "drivers/ptp/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 42edc9ef222..944c0b615e8 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_ATA)		+= ata/
 obj-$(CONFIG_TARGET_CORE)	+= target/
 obj-$(CONFIG_MTD)		+= mtd/
 obj-$(CONFIG_SPI)		+= spi/
+obj-y				+= hsi/
 obj-y				+= net/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_FUSION)		+= message/
diff --git a/drivers/hsi/Kconfig b/drivers/hsi/Kconfig
new file mode 100644
index 00000000000..2c76de438eb
--- /dev/null
+++ b/drivers/hsi/Kconfig
@@ -0,0 +1,20 @@
+#
+# HSI driver configuration
+#
+menuconfig HSI
+	tristate "HSI support"
+	---help---
+	  The "High speed synchronous Serial Interface" is
+	  synchronous serial interface used mainly to connect
+	  application engines and cellular modems.
+
+if HSI
+
+config HSI_BOARDINFO
+	bool
+	default y
+
+source "drivers/hsi/controllers/Kconfig"
+source "drivers/hsi/clients/Kconfig"
+
+endif # HSI
diff --git a/drivers/hsi/Makefile b/drivers/hsi/Makefile
new file mode 100644
index 00000000000..d47ca5de18c
--- /dev/null
+++ b/drivers/hsi/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for HSI
+#
+obj-$(CONFIG_HSI_BOARDINFO)	+= hsi_boardinfo.o
+obj-$(CONFIG_HSI)		+= hsi.o
+obj-y				+= controllers/ clients/
diff --git a/drivers/hsi/clients/Kconfig b/drivers/hsi/clients/Kconfig
new file mode 100644
index 00000000000..46eef1f77fd
--- /dev/null
+++ b/drivers/hsi/clients/Kconfig
@@ -0,0 +1,19 @@
+#
+# HSI clients configuration
+#
+
+comment "HSI clients"
+
+config HSI_CHAR
+	tristate "HSI/SSI character driver"
+	depends on HSI
+	---help---
+	  If you say Y here, you will enable the HSI/SSI character driver.
+	  This driver provides a simple character device interface for
+	  serial communication with the cellular modem over HSI/SSI bus.
+config HSI_CAIF
+	tristate "CAIF HSI driver"
+	depends on HSI
+	default n
+	---help---
+	  Provides HSI-CAIF glue layer
diff --git a/drivers/hsi/clients/Makefile b/drivers/hsi/clients/Makefile
new file mode 100644
index 00000000000..dfe33584975
--- /dev/null
+++ b/drivers/hsi/clients/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for HSI clients
+#
+
+obj-$(CONFIG_HSI_CHAR)	+= hsi_char.o
+obj-$(CONFIG_HSI_CAIF)	+= cfhsi.o
diff --git a/drivers/hsi/clients/cfhsi.c b/drivers/hsi/clients/cfhsi.c
new file mode 100644
index 00000000000..cf7ce0cb1cb
--- /dev/null
+++ b/drivers/hsi/clients/cfhsi.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author:	Daniel Martensson <Daniel.Martensson@stericsson.com>
+ * License terms: GNU General Public License (GPL) version 2.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+
+#include <net/caif/caif_hsi.h>
+
+#include <linux/hsi/hsi.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>");
+MODULE_DESCRIPTION("CAIF HSI V3 glue");
+
+#define NR_OF_CAIF_HSI_CHANNELS	2
+
+struct cfhsi_v3 {
+	struct list_head list;
+	struct cfhsi_dev dev;
+	struct platform_device pdev;
+	struct hsi_msg *tx_msg;
+	struct hsi_msg *rx_msg;
+};
+
+/* TODO: Lists are not protected with regards to device removal. */
+static LIST_HEAD(cfhsi_dev_list);
+
+static struct hsi_client *cfhsi_client;
+
+static int cfhsi_tx(u8 *ptr, int len, struct cfhsi_dev *dev)
+{
+	int res;
+	struct cfhsi_v3 *cfhsi = NULL;
+
+	/* Check length and alignment. */
+	BUG_ON(((int)ptr)%4);
+	BUG_ON(len%4);
+
+	cfhsi = container_of(dev, struct cfhsi_v3, dev);
+
+	sg_init_one(cfhsi->tx_msg->sgt.sgl, (const void *)ptr,
+		    (unsigned int)len);
+
+	/* Write on HSI device. */
+	res = hsi_async_write(cfhsi_client, cfhsi->tx_msg);
+
+	return res;
+}
+
+static int cfhsi_rx(u8 *ptr, int len, struct cfhsi_dev *dev)
+{
+	int res;
+	struct cfhsi_v3 *cfhsi = NULL;
+
+	/* Check length and alignment. */
+	BUG_ON(((int)ptr)%4);
+	BUG_ON(len%4);
+
+	cfhsi = container_of(dev, struct cfhsi_v3, dev);
+
+	sg_init_one(cfhsi->rx_msg->sgt.sgl, (const void *)ptr,
+		    (unsigned int)len);
+
+	/* Read from HSI device. */
+	res = hsi_async_read(cfhsi_client, cfhsi->rx_msg);
+
+	return res;
+}
+
+void cfhsi_v3_release(struct device *dev)
+{
+	pr_warning("%s:%d cfhsi_v3_release called\n", __FILE__, __LINE__);
+}
+
+static inline void cfhsi_v3_destructor(struct hsi_msg *msg)
+{
+	pr_warning("%s:%d cfhsi_v3_destructor called\n", __FILE__, __LINE__);
+}
+
+static inline void cfhsi_v3_read_cb(struct hsi_msg *msg)
+{
+	struct cfhsi_v3 *cfhsi = (struct cfhsi_v3 *)msg->context;
+
+	/* TODO: Error checking. */
+	BUG_ON(!cfhsi->dev.drv);
+	BUG_ON(!cfhsi->dev.drv->rx_done_cb);
+
+	cfhsi->dev.drv->rx_done_cb(cfhsi->dev.drv);
+}
+
+static inline void cfhsi_v3_write_cb(struct hsi_msg *msg)
+{
+	struct cfhsi_v3 *cfhsi = (struct cfhsi_v3 *)msg->context;
+
+	/* TODO: Error checking. */
+	BUG_ON(!cfhsi->dev.drv);
+	BUG_ON(!cfhsi->dev.drv->tx_done_cb);
+
+	cfhsi->dev.drv->tx_done_cb(cfhsi->dev.drv);
+}
+
+static int hsi_proto_probe(struct device *dev)
+{
+	int res;
+	int i;
+	struct cfhsi_v3 *cfhsi = NULL;
+
+	if (cfhsi_client)
+		return -ENODEV; /* TODO: Not correct return. */
+
+	cfhsi_client = to_hsi_client(dev);
+
+	res = hsi_claim_port(cfhsi_client, 0);
+	if (res) {
+		pr_warning("hsi_proto_probe: hsi_claim_port:%d.\n", res);
+		goto err_hsi_claim;
+	}
+
+	/* Right now we don't care about AC_WAKE (No power management). */
+	cfhsi_client->hsi_start_rx = NULL;
+	cfhsi_client->hsi_stop_rx = NULL;
+
+	/* CAIF HSI TX configuration. */
+	cfhsi_client->tx_cfg.mode =  HSI_MODE_STREAM;
+	cfhsi_client->tx_cfg.flow = HSI_FLOW_SYNC;
+	cfhsi_client->tx_cfg.channels = NR_OF_CAIF_HSI_CHANNELS;
+	cfhsi_client->tx_cfg.speed = 100000; /* TODO: What speed should be used. */
+	cfhsi_client->tx_cfg.arb_mode = HSI_ARB_RR;
+
+	/* CAIF HSI RX configuration. */
+	cfhsi_client->rx_cfg.mode =  HSI_MODE_STREAM;
+	cfhsi_client->rx_cfg.flow = HSI_FLOW_SYNC;
+	cfhsi_client->rx_cfg.channels = NR_OF_CAIF_HSI_CHANNELS;
+	cfhsi_client->rx_cfg.speed = 200000; /* TODO: What speed should be used. */
+	cfhsi_client->rx_cfg.arb_mode = HSI_ARB_RR;
+
+	res = hsi_setup(cfhsi_client);
+	if (res) {
+		pr_warning("hsi_proto_probe: hsi_setup:%d.\n", res);
+		goto err_hsi_setup;
+	}
+
+	/* Make sure that AC_WAKE is high (No power management). */
+	res = hsi_start_tx(cfhsi_client);
+	if (res) {
+		pr_warning("hsi_proto_probe: hsi_start_tx:%d.\n", res);
+		goto err_hsi_start_tx;
+	}
+
+	/* Connect channels to CAIF HSI devices. */
+	for (i = 0; i < NR_OF_CAIF_HSI_CHANNELS; i++) {
+		cfhsi = kzalloc(sizeof(struct cfhsi_v3), GFP_KERNEL);
+		if (!cfhsi) {
+			res = -ENOMEM;
+			/* TODO: Error handling. */
+		}
+
+		/* Assign HSI client to this CAIF HSI device. */
+		cfhsi->dev.cfhsi_tx = cfhsi_tx;
+		cfhsi->dev.cfhsi_rx = cfhsi_rx;
+
+		/* Allocate HSI messages. */
+		cfhsi->tx_msg = hsi_alloc_msg(1, GFP_KERNEL);
+		cfhsi->rx_msg = hsi_alloc_msg(1, GFP_KERNEL);
+		if (!cfhsi->tx_msg || !cfhsi->rx_msg) {
+			res = -ENOMEM;
+			/* TODO: Error handling. */
+		}
+
+		/* Set up TX message. */
+		cfhsi->tx_msg->cl = cfhsi_client;
+		cfhsi->tx_msg->context = (void *)cfhsi;
+		cfhsi->tx_msg->complete = cfhsi_v3_write_cb;
+		cfhsi->tx_msg->destructor = cfhsi_v3_destructor;
+		cfhsi->tx_msg->channel = i;
+		cfhsi->tx_msg->ttype = HSI_MSG_WRITE;
+		cfhsi->tx_msg->break_frame = 0; /* No break frame. */
+
+		/* Set up RX message. */
+		cfhsi->rx_msg->cl = cfhsi_client;
+		cfhsi->rx_msg->context = (void *)cfhsi;
+		cfhsi->rx_msg->complete = cfhsi_v3_read_cb;
+		cfhsi->rx_msg->destructor = cfhsi_v3_destructor;
+		cfhsi->rx_msg->channel = i;
+		cfhsi->rx_msg->ttype = HSI_MSG_READ;
+		cfhsi->rx_msg->break_frame = 0; /* No break frame. */
+
+		/* Initialize CAIF HSI platform device. */
+		cfhsi->pdev.name = "cfhsi";
+		cfhsi->pdev.dev.platform_data = &cfhsi->dev;
+		cfhsi->pdev.dev.release = cfhsi_v3_release;
+		/* Use channel number as id. */
+		cfhsi->pdev.id = i;
+		/* Register platform device. */
+		res = platform_device_register(&cfhsi->pdev);
+		if (res) {
+			pr_warning("hsi_proto_probe: plat_dev_reg:%d.\n", res);
+			res = -ENODEV;
+			/* TODO: Error handling. */
+		}
+
+		/* Add HSI device to device list. */
+		list_add_tail(&cfhsi->list, &cfhsi_dev_list);
+	}
+
+	return res;
+
+ err_hsi_start_tx:
+ err_hsi_setup:
+	hsi_release_port(cfhsi_client);
+ err_hsi_claim:
+	cfhsi_client = NULL;
+
+	return res;
+}
+
+static int hsi_proto_remove(struct device *dev)
+{
+	struct cfhsi_v3 *cfhsi = NULL;
+	struct list_head *list_node;
+	struct list_head *n;
+
+	if (!cfhsi_client)
+		return -ENODEV;
+
+	list_for_each_safe(list_node, n, &cfhsi_dev_list) {
+		cfhsi = list_entry(list_node, struct cfhsi_v3, list);
+		/* Remove from list. */
+		list_del(list_node);
+		/* Our HSI device is gone, unregister CAIF HSI device. */
+		platform_device_del(&cfhsi->pdev);
+		hsi_free_msg(cfhsi->tx_msg);
+		hsi_free_msg(cfhsi->rx_msg);
+		/* Free memory. */
+		kfree(cfhsi);
+	}
+
+	hsi_stop_tx(cfhsi_client);
+	hsi_release_port(cfhsi_client);
+
+	cfhsi_client = NULL;
+
+	return 0;
+}
+
+static int hsi_proto_suspend(struct device *dev, pm_message_t mesg)
+{
+	/* Not handled. */
+	pr_info("hsi_proto_suspend.\n");
+
+	return 0;
+}
+
+static int hsi_proto_resume(struct device *dev)
+{
+	/* Not handled. */
+	pr_info("hsi_proto_resume.\n");
+
+	return 0;
+}
+
+static struct hsi_client_driver cfhsi_v3_driver = {
+	.driver = {
+		.name = "cfhsi_v3_driver",
+		.owner	= THIS_MODULE,
+		.probe = hsi_proto_probe,
+		.remove = __devexit_p(hsi_proto_remove),
+		.suspend = hsi_proto_suspend,
+		.resume = hsi_proto_resume,
+	},
+};
+
+static int __init cfhsi_v3_init(void)
+{
+	int res;
+
+	/* Register protocol driver for HSI interface. */
+	res =  hsi_register_client_driver(&cfhsi_v3_driver);
+	if (res)
+		pr_warning("Failed to register CAIF HSI V3 driver.\n");
+
+	return res;
+}
+
+static void __exit cfhsi_v3_exit(void)
+{
+	struct cfhsi_v3 *cfhsi = NULL;
+	struct list_head *list_node;
+	struct list_head *n;
+
+	/* Unregister driver. */
+	hsi_unregister_client_driver(&cfhsi_v3_driver);
+
+	if (!cfhsi_client)
+		return;
+
+	list_for_each_safe(list_node, n, &cfhsi_dev_list) {
+		cfhsi = list_entry(list_node, struct cfhsi_v3, list);
+		platform_device_del(&cfhsi->pdev);
+		hsi_free_msg(cfhsi->tx_msg);
+		hsi_free_msg(cfhsi->rx_msg);
+		kfree(cfhsi);
+	}
+
+	hsi_stop_tx(cfhsi_client);
+	hsi_release_port(cfhsi_client);
+
+	cfhsi_client = NULL;
+}
+
+module_init(cfhsi_v3_init);
+module_exit(cfhsi_v3_exit);
diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c
new file mode 100644
index 00000000000..6d5bf8d0012
--- /dev/null
+++ b/drivers/hsi/clients/hsi_char.c
@@ -0,0 +1,1118 @@
+/*
+ * hsi-char.c
+ *
+ * HSI character device driver, implements the character device
+ * interface.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Andras Domokos <andras.domokos@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <asm/atomic.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/ioctl.h>
+#include <linux/wait.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/scatterlist.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/hsi_char.h>
+
+#define HSI_CHAR_CHANNELS	8
+#define HSI_CHAR_DEVS		8
+#define HSI_CHAR_MSGS		4
+
+#define HSI_CHST_UNAVAIL	0 /* SBZ! */
+#define HSI_CHST_AVAIL		1
+
+#define HSI_CHST_CLOSED		(0 << 4)
+#define HSI_CHST_CLOSING	(1 << 4)
+#define HSI_CHST_OPENING	(2 << 4)
+#define HSI_CHST_OPENED		(3 << 4)
+
+#define HSI_CHST_READOFF	(0 << 8)
+#define HSI_CHST_READON		(1 << 8)
+#define HSI_CHST_READING	(2 << 8)
+
+#define HSI_CHST_WRITEOFF	(0 << 12)
+#define HSI_CHST_WRITEON	(1 << 12)
+#define HSI_CHST_WRITING	(2 << 12)
+
+#define HSI_CHST_OC_MASK	0xf0
+#define HSI_CHST_RD_MASK	0xf00
+#define HSI_CHST_WR_MASK	0xf000
+
+#define HSI_CHST_OC(c)		((c)->state & HSI_CHST_OC_MASK)
+#define HSI_CHST_RD(c)		((c)->state & HSI_CHST_RD_MASK)
+#define HSI_CHST_WR(c)		((c)->state & HSI_CHST_WR_MASK)
+
+#define HSI_CHST_OC_SET(c, v) \
+	do { \
+		(c)->state &= ~HSI_CHST_OC_MASK; \
+		(c)->state |= v; \
+	} while (0);
+
+#define HSI_CHST_RD_SET(c, v) \
+	do { \
+		(c)->state &= ~HSI_CHST_RD_MASK; \
+		(c)->state |= v; \
+	} while (0);
+
+#define HSI_CHST_WR_SET(c, v) \
+	do { \
+		(c)->state &= ~HSI_CHST_WR_MASK; \
+		(c)->state |= v; \
+	} while (0);
+
+#define HSI_CHAR_POLL_RST	(-1)
+#define HSI_CHAR_POLL_OFF	0
+#define HSI_CHAR_POLL_ON	1
+
+#define HSI_CHAR_RX		0
+#define HSI_CHAR_TX		1
+
+struct hsi_char_channel {
+	unsigned int		ch;
+	unsigned int		state;
+	int			wlrefcnt;
+	int			rxpoll;
+	struct hsi_client	*cl;
+	struct list_head	free_msgs_list;
+	struct list_head	rx_msgs_queue;
+	struct list_head	tx_msgs_queue;
+	int			poll_event;
+	spinlock_t		lock;
+	struct fasync_struct	*async_queue;
+	wait_queue_head_t	rx_wait;
+	wait_queue_head_t	tx_wait;
+};
+
+struct hsi_char_client_data {
+	atomic_t		refcnt;
+	int			attached;
+	atomic_t		breq;
+	struct hsi_char_channel	channels[HSI_CHAR_DEVS];
+};
+
+static unsigned int max_data_size = 0x1000;
+module_param(max_data_size, uint, 1);
+MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");
+
+static int channels_map[HSI_CHAR_DEVS] = {0, -1, -1, -1, -1, -1, -1, -1};
+module_param_array(channels_map, int, NULL, 0);
+MODULE_PARM_DESC(channels_map, "Array of HSI channels ([0...7]) to be probed");
+
+static dev_t hsi_char_dev;
+static struct hsi_char_client_data hsi_char_cl_data;
+
+static inline void hsi_char_msg_free(struct hsi_msg *msg)
+{
+	msg->complete = NULL;
+	msg->destructor = NULL;
+	kfree(sg_virt(msg->sgt.sgl));
+	hsi_free_msg(msg);
+}
+
+static inline void hsi_char_msgs_free(struct hsi_char_channel *channel)
+{
+	struct hsi_msg *msg, *tmp;
+
+	list_for_each_entry_safe(msg, tmp, &channel->free_msgs_list, link) {
+		list_del(&msg->link);
+		hsi_char_msg_free(msg);
+	}
+	list_for_each_entry_safe(msg, tmp, &channel->rx_msgs_queue, link) {
+		list_del(&msg->link);
+		hsi_char_msg_free(msg);
+	}
+	list_for_each_entry_safe(msg, tmp, &channel->tx_msgs_queue, link) {
+		list_del(&msg->link);
+		hsi_char_msg_free(msg);
+	}
+}
+
+static inline struct hsi_msg *hsi_char_msg_alloc(unsigned int alloc_size)
+{
+	struct hsi_msg *msg;
+	void *buf;
+
+	msg = hsi_alloc_msg(1, GFP_KERNEL);
+	if (!msg)
+		goto out;
+	buf = kmalloc(alloc_size, GFP_KERNEL);
+	if (!buf) {
+		hsi_free_msg(msg);
+		goto out;
+	}
+	sg_init_one(msg->sgt.sgl, buf, alloc_size);
+	msg->context = buf;
+	return msg;
+out:
+	return NULL;
+}
+
+static inline int hsi_char_msgs_alloc(struct hsi_char_channel *channel)
+{
+	struct hsi_msg *msg;
+	int i;
+
+	for (i = 0; i < HSI_CHAR_MSGS; i++) {
+		msg = hsi_char_msg_alloc(max_data_size);
+		if (!msg)
+			goto out;
+		msg->channel = channel->ch;
+		list_add_tail(&msg->link, &channel->free_msgs_list);
+	}
+	return 0;
+out:
+	hsi_char_msgs_free(channel);
+
+	return -ENOMEM;
+}
+
+static int _hsi_char_release(struct hsi_char_channel *channel, int remove)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(channel->cl);
+	int ret = 0, refcnt;
+
+	spin_lock_bh(&channel->lock);
+	if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+		goto out;
+	HSI_CHST_OC_SET(channel, HSI_CHST_CLOSING);
+	spin_unlock_bh(&channel->lock);
+
+	while (channel->wlrefcnt > 0) {
+		hsi_stop_tx(channel->cl);
+		channel->wlrefcnt--;
+	}
+
+	if (channel->rxpoll == HSI_CHAR_POLL_ON)
+		channel->poll_event |= POLLERR;
+
+	wake_up_interruptible(&channel->rx_wait);
+	wake_up_interruptible(&channel->tx_wait);
+
+	refcnt = atomic_dec_return(&cl_data->refcnt);
+	if (!refcnt) {
+		hsi_flush(channel->cl);
+		hsi_release_port(channel->cl);
+		cl_data->attached = 0;
+	}
+	hsi_char_msgs_free(channel);
+
+	spin_lock_bh(&channel->lock);
+	HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+	HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+	HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+out:
+	if (remove)
+		channel->cl = NULL;
+	spin_unlock_bh(&channel->lock);
+
+	return ret;
+}
+
+static struct hsi_client_driver hsi_char_driver;
+static struct cdev hsi_char_cdev;
+static const struct file_operations hsi_char_fops;
+static struct class *hsi_char_class;
+
+static int __devinit hsi_char_probe(struct device *dev)
+{
+	struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+	struct hsi_char_channel *channel = cl_data->channels;
+	struct hsi_client *cl = to_hsi_client(dev);
+	char devname[] = "hsi_char";
+	int i;
+	int ret;
+
+	for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
+		if (channel->state == HSI_CHST_AVAIL)
+			channel->cl = cl;
+	}
+	cl->hsi_start_rx = NULL;
+	cl->hsi_stop_rx = NULL;
+	atomic_set(&cl_data->refcnt, 0);
+	atomic_set(&cl_data->breq, 1);
+	cl_data->attached = 0;
+	hsi_client_set_drvdata(cl, cl_data);
+
+	ret = alloc_chrdev_region(&hsi_char_dev, 0, HSI_CHAR_DEVS, devname);
+	if (ret < 0) {
+		hsi_unregister_client_driver(&hsi_char_driver);
+		return ret;
+	}
+
+	cdev_init(&hsi_char_cdev, &hsi_char_fops);
+	ret = cdev_add(&hsi_char_cdev, hsi_char_dev, HSI_CHAR_DEVS);
+	if (ret) {
+		unregister_chrdev_region(hsi_char_dev, HSI_CHAR_DEVS);
+		hsi_unregister_client_driver(&hsi_char_driver);
+		return ret;
+	}
+
+	hsi_char_class = class_create(THIS_MODULE, "hsi");
+	if (IS_ERR(hsi_char_class))
+		pr_err("ERROR: hsi class creation failed!\n");
+
+	device_create(hsi_char_class, NULL, hsi_char_cdev.dev, NULL, devname);
+
+	return 0;
+}
+
+static int __devexit hsi_char_remove(struct device *dev)
+{
+	struct hsi_client *cl = to_hsi_client(dev);
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+	struct hsi_char_channel *channel = cl_data->channels;
+	int i;
+
+	for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
+		if (!(channel->state & HSI_CHST_AVAIL))
+			continue;
+		_hsi_char_release(channel, 1);
+	}
+
+	return 0;
+}
+
+static inline unsigned int hsi_char_msg_len_get(struct hsi_msg *msg)
+{
+	return msg->sgt.sgl->length;
+}
+
+static inline void hsi_char_msg_len_set(struct hsi_msg *msg, unsigned int len)
+{
+	msg->sgt.sgl->length = len;
+}
+
+static void hsi_char_data_available(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+	int ret;
+
+	if (msg->status == HSI_STATUS_ERROR) {
+		ret = hsi_async_read(channel->cl, msg);
+		if (ret < 0) {
+			list_add_tail(&msg->link, &channel->free_msgs_list);
+			spin_lock_bh(&channel->lock);
+			list_add_tail(&msg->link, &channel->free_msgs_list);
+			channel->rxpoll = HSI_CHAR_POLL_OFF;
+			spin_unlock_bh(&channel->lock);
+		}
+	} else {
+		spin_lock_bh(&channel->lock);
+		channel->rxpoll = HSI_CHAR_POLL_OFF;
+		channel->poll_event |= (POLLIN | POLLRDNORM);
+		spin_unlock_bh(&channel->lock);
+		spin_lock_bh(&channel->lock);
+		list_add_tail(&msg->link, &channel->free_msgs_list);
+		spin_unlock_bh(&channel->lock);
+		wake_up_interruptible(&channel->rx_wait);
+	}
+}
+
+static void hsi_char_rx_completed(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+	spin_lock_bh(&channel->lock);
+	list_add_tail(&msg->link, &channel->rx_msgs_queue);
+	spin_unlock_bh(&channel->lock);
+	wake_up_interruptible(&channel->rx_wait);
+}
+
+static void hsi_char_rx_msg_destructor(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+	spin_lock_bh(&channel->lock);
+	list_add_tail(&msg->link, &channel->free_msgs_list);
+	HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+	spin_unlock_bh(&channel->lock);
+}
+
+static void hsi_char_rx_poll_destructor(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+	spin_lock_bh(&channel->lock);
+	list_add_tail(&msg->link, &channel->free_msgs_list);
+	channel->rxpoll = HSI_CHAR_POLL_RST;
+	spin_unlock_bh(&channel->lock);
+}
+
+static int hsi_char_rx_poll(struct hsi_char_channel *channel)
+{
+	struct hsi_msg *msg;
+	int ret = 0;
+
+	spin_lock_bh(&channel->lock);
+	if (list_empty(&channel->free_msgs_list)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	if (channel->rxpoll == HSI_CHAR_POLL_ON)
+		goto out;
+	msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+	list_del(&msg->link);
+	channel->rxpoll = HSI_CHAR_POLL_ON;
+	spin_unlock_bh(&channel->lock);
+	hsi_char_msg_len_set(msg, 0);
+	msg->complete = hsi_char_data_available;
+	msg->destructor = hsi_char_rx_poll_destructor;
+	/* don't touch msg->context! */
+	ret = hsi_async_read(channel->cl, msg);
+	spin_lock_bh(&channel->lock);
+	if (ret < 0) {
+		list_add_tail(&msg->link, &channel->free_msgs_list);
+		channel->rxpoll = HSI_CHAR_POLL_OFF;
+		goto out;
+	}
+out:
+	spin_unlock_bh(&channel->lock);
+
+	return ret;
+}
+
+static void hsi_char_tx_completed(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+	spin_lock_bh(&channel->lock);
+	list_add_tail(&msg->link, &channel->tx_msgs_queue);
+	channel->poll_event |= (POLLOUT | POLLWRNORM);
+	spin_unlock_bh(&channel->lock);
+	wake_up_interruptible(&channel->tx_wait);
+}
+
+static void hsi_char_tx_msg_destructor(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+	spin_lock_bh(&channel->lock);
+	list_add_tail(&msg->link, &channel->free_msgs_list);
+	HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+	spin_unlock_bh(&channel->lock);
+}
+
+static void hsi_char_rx_poll_rst(struct hsi_client *cl)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+	struct hsi_char_channel *channel = cl_data->channels;
+	int i;
+
+	for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
+		if ((HSI_CHST_OC(channel) == HSI_CHST_OPENED) &&
+			(channel->rxpoll == HSI_CHAR_POLL_RST))
+			hsi_char_rx_poll(channel);
+	}
+}
+
+static void hsi_char_reset(struct hsi_client *cl)
+{
+	hsi_flush(cl);
+	hsi_char_rx_poll_rst(cl);
+}
+
+static void hsi_char_rx_cancel(struct hsi_char_channel *channel)
+{
+	hsi_flush(channel->cl);
+	hsi_char_rx_poll_rst(channel->cl);
+}
+
+static void hsi_char_tx_cancel(struct hsi_char_channel *channel)
+{
+	hsi_flush(channel->cl);
+	hsi_char_rx_poll_rst(channel->cl);
+}
+
+static void hsi_char_bcast_break(struct hsi_client *cl)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+	struct hsi_char_channel *channel = cl_data->channels;
+	int i;
+
+	for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
+		if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+			continue;
+		channel->poll_event |= POLLPRI;
+		wake_up_interruptible(&channel->rx_wait);
+		wake_up_interruptible(&channel->tx_wait);
+	}
+}
+
+static void hsi_char_break_received(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+	int ret;
+
+	hsi_char_bcast_break(msg->cl);
+	ret = hsi_async_read(msg->cl, msg);
+	if (ret < 0) {
+		hsi_free_msg(msg);
+		atomic_inc(&cl_data->breq);
+	}
+}
+
+static void hsi_char_break_req_destructor(struct hsi_msg *msg)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+
+	hsi_free_msg(msg);
+	atomic_inc(&cl_data->breq);
+}
+
+static int hsi_char_break_request(struct hsi_client *cl)
+{
+	struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+	struct hsi_msg *msg;
+	int ret = 0;
+
+	if (!atomic_dec_and_test(&cl_data->breq)) {
+		atomic_inc(&cl_data->breq);
+		return -EBUSY;
+	}
+	msg = hsi_alloc_msg(0, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+	msg->break_frame = 1;
+	msg->complete = hsi_char_break_received;
+	msg->destructor = hsi_char_break_req_destructor;
+	ret = hsi_async_read(cl, msg);
+	if (ret < 0)
+		hsi_free_msg(msg);
+
+	return ret;
+}
+
+static int hsi_char_break_send(struct hsi_client *cl)
+{
+	struct hsi_msg *msg;
+	int ret = 0;
+
+	msg = hsi_alloc_msg(0, GFP_ATOMIC);
+	if (!msg)
+		return -ENOMEM;
+	msg->break_frame = 1;
+	msg->complete = hsi_free_msg;
+	msg->destructor = hsi_free_msg;
+	ret = hsi_async_write(cl, msg);
+	if (ret < 0)
+		hsi_free_msg(msg);
+
+	return ret;
+}
+
+static inline int ssi_check_common_cfg(struct hsi_config *cfg)
+{
+	if ((cfg->mode != HSI_MODE_STREAM) && (cfg->mode != HSI_MODE_FRAME))
+		return -EINVAL;
+	if ((cfg->channels == 0) || (cfg->channels > HSI_CHAR_CHANNELS))
+		return -EINVAL;
+	if (cfg->channels & (cfg->channels - 1))
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int ssi_check_rx_cfg(struct hsi_config *cfg)
+{
+	int ret;
+
+	ret = ssi_check_common_cfg(cfg);
+	if (ret < 0)
+		return ret;
+	if ((cfg->flow != HSI_FLOW_SYNC) && (cfg->flow != HSI_FLOW_PIPE))
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int ssi_check_tx_cfg(struct hsi_config *cfg)
+{
+	int ret;
+
+	ret = ssi_check_common_cfg(cfg);
+	if (ret < 0)
+		return ret;
+	if ((cfg->arb_mode != HSI_ARB_RR) && (cfg->arb_mode != HSI_ARB_PRIO))
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int hsi_char_cfg_set(struct hsi_client *cl,
+						struct hsi_config *cfg, int dir)
+{
+	struct hsi_config *rxtx_cfg;
+	int ret = 0;
+
+	if (dir == HSI_CHAR_RX) {
+		rxtx_cfg = &cl->rx_cfg;
+		ret = ssi_check_rx_cfg(cfg);
+	} else {
+		rxtx_cfg = &cl->tx_cfg;
+		ret = ssi_check_tx_cfg(cfg);
+	}
+	if (ret < 0)
+		return ret;
+
+	*rxtx_cfg = *cfg;
+	ret = hsi_setup(cl);
+	if (ret < 0)
+		return ret;
+
+	if ((dir == HSI_CHAR_RX) && (cfg->mode == HSI_MODE_FRAME))
+		hsi_char_break_request(cl);
+
+	return ret;
+}
+
+static inline void hsi_char_cfg_get(struct hsi_client *cl,
+						struct hsi_config *cfg, int dir)
+{
+	struct hsi_config *rxtx_cfg;
+
+	if (dir == HSI_CHAR_RX)
+		rxtx_cfg = &cl->rx_cfg;
+	else
+		rxtx_cfg = &cl->tx_cfg;
+	*cfg = *rxtx_cfg;
+}
+
+static inline void hsi_char_rx2icfg(struct hsi_config *cfg,
+						struct hsc_rx_config *rx_cfg)
+{
+	cfg->mode = rx_cfg->mode;
+	cfg->flow = rx_cfg->flow;
+	cfg->channels = rx_cfg->channels;
+	cfg->speed = 0;
+}
+
+static inline void hsi_char_tx2icfg(struct hsi_config *cfg,
+						struct hsc_tx_config *tx_cfg)
+{
+	int ch;
+
+	cfg->mode = tx_cfg->mode;
+	cfg->channels = tx_cfg->channels;
+	cfg->speed = tx_cfg->speed;
+	cfg->arb_mode = tx_cfg->arb_mode;
+	for (ch = 0; ch < HSI_MAX_CHANNELS; ch++)
+		cfg->ch_prio[ch] = (tx_cfg->priority >> ch) & 1;
+}
+
+static inline void hsi_char_rx2ecfg(struct hsc_rx_config *rx_cfg,
+							struct hsi_config *cfg)
+{
+	rx_cfg->mode = cfg->mode;
+	rx_cfg->flow = cfg->flow;
+	rx_cfg->channels = cfg->channels;
+}
+
+static inline void hsi_char_tx2ecfg(struct hsc_tx_config *tx_cfg,
+							struct hsi_config *cfg)
+{
+	int ch;
+
+	tx_cfg->mode = cfg->mode;
+	tx_cfg->channels = cfg->channels;
+	tx_cfg->speed = cfg->speed;
+	tx_cfg->arb_mode = cfg->arb_mode;
+	tx_cfg->priority = 0;
+	for (ch = 0; ch < HSI_MAX_CHANNELS; ch++)
+		if (cfg->ch_prio[ch])
+			tx_cfg->priority |= (1 << ch);
+}
+
+static ssize_t hsi_char_read(struct file *file, char __user *buf,
+						size_t len, loff_t *ppos)
+{
+	struct hsi_char_channel *channel = file->private_data;
+	struct hsi_msg *msg = NULL;
+	ssize_t ret;
+
+	if (len == 0) {
+		channel->poll_event &= ~POLLPRI;
+		return 0;
+	}
+	channel->poll_event &= ~POLLPRI;
+
+	if (!IS_ALIGNED(len, sizeof(u32)))
+		return -EINVAL;
+
+	if (len > max_data_size)
+		len = max_data_size;
+
+	spin_lock_bh(&channel->lock);
+	if (HSI_CHST_OC(channel) != HSI_CHST_OPENED) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (HSI_CHST_RD(channel) != HSI_CHST_READOFF) {
+		ret = -EBUSY;
+		goto out;
+	}
+	if (channel->ch >= channel->cl->rx_cfg.channels) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (list_empty(&channel->free_msgs_list)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+	list_del(&msg->link);
+	spin_unlock_bh(&channel->lock);
+	hsi_char_msg_len_set(msg, len);
+	msg->complete = hsi_char_rx_completed;
+	msg->destructor = hsi_char_rx_msg_destructor;
+	ret = hsi_async_read(channel->cl, msg);
+	spin_lock_bh(&channel->lock);
+	if (ret < 0)
+		goto out;
+	HSI_CHST_RD_SET(channel, HSI_CHST_READING);
+	msg = NULL;
+
+	for ( ; ; ) {
+		DEFINE_WAIT(wait);
+
+		if (!list_empty(&channel->rx_msgs_queue)) {
+			msg = list_first_entry(&channel->rx_msgs_queue,
+					struct hsi_msg, link);
+			HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+			channel->poll_event &= ~(POLLIN | POLLRDNORM);
+			list_del(&msg->link);
+			spin_unlock_bh(&channel->lock);
+			if (msg->status == HSI_STATUS_ERROR) {
+				ret = -EIO;
+			} else {
+				ret = copy_to_user((void __user *)buf,
+						msg->context,
+						hsi_char_msg_len_get(msg));
+				if (ret)
+					ret = -EFAULT;
+				else
+					ret = hsi_char_msg_len_get(msg);
+			}
+			spin_lock_bh(&channel->lock);
+			break;
+		} else if (signal_pending(current)) {
+			spin_unlock_bh(&channel->lock);
+			hsi_char_rx_cancel(channel);
+			spin_lock_bh(&channel->lock);
+			HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+			ret = -EINTR;
+			break;
+		} else if ((HSI_CHST_OC(channel) == HSI_CHST_CLOSING) ||
+				(HSI_CHST_OC(channel) == HSI_CHST_CLOSING)) {
+			ret = -EIO;
+			break;
+		}
+		prepare_to_wait(&channel->rx_wait, &wait, TASK_INTERRUPTIBLE);
+		spin_unlock_bh(&channel->lock);
+
+		schedule();
+
+		spin_lock_bh(&channel->lock);
+		finish_wait(&channel->rx_wait, &wait);
+	}
+out:
+	if (msg)
+		list_add_tail(&msg->link, &channel->free_msgs_list);
+	spin_unlock_bh(&channel->lock);
+
+	return ret;
+}
+
+static ssize_t hsi_char_write(struct file *file, const char __user *buf,
+						size_t len, loff_t *ppos)
+{
+	struct hsi_char_channel *channel = file->private_data;
+	struct hsi_msg *msg = NULL;
+	ssize_t ret;
+
+	if ((len == 0) || !IS_ALIGNED(len, sizeof(u32)))
+		return -EINVAL;
+
+	if (len > max_data_size)
+		len = max_data_size;
+
+	spin_lock_bh(&channel->lock);
+	if (HSI_CHST_OC(channel) != HSI_CHST_OPENED) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (HSI_CHST_WR(channel) != HSI_CHST_WRITEOFF) {
+		ret = -EBUSY;
+		goto out;
+	}
+	if (channel->ch >= channel->cl->tx_cfg.channels) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (list_empty(&channel->free_msgs_list)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+	list_del(&msg->link);
+	HSI_CHST_WR_SET(channel, HSI_CHST_WRITEON);
+	spin_unlock_bh(&channel->lock);
+
+	if (copy_from_user(msg->context, (void __user *)buf, len)) {
+		spin_lock_bh(&channel->lock);
+		HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+		ret = -EFAULT;
+		goto out;
+	}
+
+	hsi_char_msg_len_set(msg, len);
+	msg->complete = hsi_char_tx_completed;
+	msg->destructor = hsi_char_tx_msg_destructor;
+	channel->poll_event &= ~(POLLOUT | POLLWRNORM);
+	ret = hsi_async_write(channel->cl, msg);
+	spin_lock_bh(&channel->lock);
+	if (ret < 0) {
+		channel->poll_event |= (POLLOUT | POLLWRNORM);
+		HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+		goto out;
+	}
+	HSI_CHST_WR_SET(channel, HSI_CHST_WRITING);
+	msg = NULL;
+
+	for ( ; ; ) {
+		DEFINE_WAIT(wait);
+
+		if (!list_empty(&channel->tx_msgs_queue)) {
+			msg = list_first_entry(&channel->tx_msgs_queue,
+					struct hsi_msg, link);
+			list_del(&msg->link);
+			HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+			if (msg->status == HSI_STATUS_ERROR)
+				ret = -EIO;
+			else
+				ret = hsi_char_msg_len_get(msg);
+			break;
+		} else if (signal_pending(current)) {
+			spin_unlock_bh(&channel->lock);
+			hsi_char_tx_cancel(channel);
+			spin_lock_bh(&channel->lock);
+			HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+			ret = -EINTR;
+			break;
+		} else if ((HSI_CHST_OC(channel) == HSI_CHST_CLOSING) ||
+				(HSI_CHST_OC(channel) == HSI_CHST_CLOSING)) {
+			ret = -EIO;
+			break;
+		}
+		prepare_to_wait(&channel->tx_wait, &wait, TASK_INTERRUPTIBLE);
+		spin_unlock_bh(&channel->lock);
+
+		schedule();
+
+		spin_lock_bh(&channel->lock);
+		finish_wait(&channel->tx_wait, &wait);
+	}
+out:
+	if (msg)
+		list_add_tail(&msg->link, &channel->free_msgs_list);
+
+	spin_unlock_bh(&channel->lock);
+
+	return ret;
+}
+
+static unsigned int hsi_char_poll(struct file *file, poll_table *wait)
+{
+	struct hsi_char_channel *channel = file->private_data;
+	unsigned int ret;
+
+	spin_lock_bh(&channel->lock);
+	if ((HSI_CHST_OC(channel) != HSI_CHST_OPENED) ||
+		(channel->ch >= channel->cl->rx_cfg.channels)) {
+		spin_unlock_bh(&channel->lock);
+		return -ENODEV;
+	}
+	poll_wait(file, &channel->rx_wait, wait);
+	poll_wait(file, &channel->tx_wait, wait);
+	ret = channel->poll_event;
+	spin_unlock_bh(&channel->lock);
+	hsi_char_rx_poll(channel);
+
+	return ret;
+}
+
+static long hsi_char_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	struct hsi_char_channel *channel = file->private_data;
+	unsigned int state;
+	struct hsi_config cfg;
+	struct hsc_rx_config rx_cfg;
+	struct hsc_tx_config tx_cfg;
+	long ret = 0;
+
+	if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+		return -ENODEV;
+
+	switch (cmd) {
+	case HSC_RESET:
+		hsi_char_reset(channel->cl);
+		break;
+	case HSC_SET_PM:
+		if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
+			return -EFAULT;
+		if (state == HSC_PM_DISABLE) {
+			ret = hsi_start_tx(channel->cl);
+			if (!ret)
+				channel->wlrefcnt++;
+		} else if ((state == HSC_PM_ENABLE)
+				&& (channel->wlrefcnt > 0)) {
+			ret = hsi_stop_tx(channel->cl);
+			if (!ret)
+				channel->wlrefcnt--;
+		} else {
+			ret = -EINVAL;
+		}
+		break;
+	case HSC_SEND_BREAK:
+		return hsi_char_break_send(channel->cl);
+	case HSC_SET_RX:
+		if (copy_from_user(&rx_cfg, (void __user *)arg, sizeof(rx_cfg)))
+			return -EFAULT;
+		hsi_char_rx2icfg(&cfg, &rx_cfg);
+		return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_RX);
+	case HSC_GET_RX:
+		hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_RX);
+		hsi_char_rx2ecfg(&rx_cfg, &cfg);
+		if (copy_to_user((void __user *)arg, &rx_cfg, sizeof(rx_cfg)))
+			return -EFAULT;
+		break;
+	case HSC_SET_TX:
+		if (copy_from_user(&tx_cfg, (void __user *)arg, sizeof(tx_cfg)))
+			return -EFAULT;
+		hsi_char_tx2icfg(&cfg, &tx_cfg);
+		return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_TX);
+	case HSC_GET_TX:
+		hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_TX);
+		hsi_char_tx2ecfg(&tx_cfg, &cfg);
+		if (copy_to_user((void __user *)arg, &tx_cfg, sizeof(tx_cfg)))
+			return -EFAULT;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return ret;
+}
+
+static int hsi_char_open(struct inode *inode, struct file *file)
+{
+	struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+	struct hsi_char_channel *channel = cl_data->channels + iminor(inode);
+	int ret = 0, refcnt;
+
+	spin_lock_bh(&channel->lock);
+	if ((channel->state == HSI_CHST_UNAVAIL) || (!channel->cl)) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (HSI_CHST_OC(channel) != HSI_CHST_CLOSED) {
+		ret = -EBUSY;
+		goto out;
+	}
+	HSI_CHST_OC_SET(channel, HSI_CHST_OPENING);
+	spin_unlock_bh(&channel->lock);
+
+	refcnt = atomic_inc_return(&cl_data->refcnt);
+	if (refcnt == 1) {
+		if (cl_data->attached) {
+			atomic_dec(&cl_data->refcnt);
+			spin_lock_bh(&channel->lock);
+			HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+			ret = -EBUSY;
+			goto out;
+		}
+		ret = hsi_claim_port(channel->cl, 0);
+		if (ret < 0) {
+			atomic_dec(&cl_data->refcnt);
+			spin_lock_bh(&channel->lock);
+			HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+			goto out;
+		}
+		hsi_setup(channel->cl);
+	} else if (!cl_data->attached) {
+		atomic_dec(&cl_data->refcnt);
+		spin_lock_bh(&channel->lock);
+		HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+		ret = -ENODEV;
+		goto out;
+	}
+	ret = hsi_char_msgs_alloc(channel);
+
+	if (ret < 0) {
+		refcnt = atomic_dec_return(&cl_data->refcnt);
+		if (!refcnt)
+			hsi_release_port(channel->cl);
+		spin_lock_bh(&channel->lock);
+		HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+		goto out;
+	}
+	if (refcnt == 1)
+		cl_data->attached = 1;
+	channel->wlrefcnt = 0;
+	channel->rxpoll = HSI_CHAR_POLL_OFF;
+	channel->poll_event = (POLLOUT | POLLWRNORM);
+	file->private_data = channel;
+	spin_lock_bh(&channel->lock);
+	HSI_CHST_OC_SET(channel, HSI_CHST_OPENED);
+out:
+	spin_unlock_bh(&channel->lock);
+
+	return ret;
+}
+
+static int hsi_char_release(struct inode *inode, struct file *file)
+{
+	struct hsi_char_channel *channel = file->private_data;
+	return _hsi_char_release(channel, 0);
+}
+
+static int hsi_char_fasync(int fd, struct file *file, int on)
+{
+	struct hsi_char_channel *channel = file->private_data;
+
+	if (fasync_helper(fd, file, on, &channel->async_queue) < 0)
+		return -EIO;
+
+	return 0;
+}
+
+static const struct file_operations hsi_char_fops = {
+	.owner		= THIS_MODULE,
+	.read		= hsi_char_read,
+	.write		= hsi_char_write,
+	.poll		= hsi_char_poll,
+	.unlocked_ioctl	= hsi_char_ioctl,
+	.open		= hsi_char_open,
+	.release	= hsi_char_release,
+	.fasync		= hsi_char_fasync,
+};
+
+static struct hsi_client_driver hsi_char_driver = {
+	.driver = {
+		.name	= "hsi_char",
+		.owner	= THIS_MODULE,
+		.probe	= hsi_char_probe,
+		.remove	= hsi_char_remove,
+	},
+};
+
+static inline void hsi_char_channel_init(struct hsi_char_channel *channel)
+{
+	channel->state = HSI_CHST_AVAIL;
+	INIT_LIST_HEAD(&channel->free_msgs_list);
+	init_waitqueue_head(&channel->rx_wait);
+	init_waitqueue_head(&channel->tx_wait);
+	spin_lock_init(&channel->lock);
+	INIT_LIST_HEAD(&channel->rx_msgs_queue);
+	INIT_LIST_HEAD(&channel->tx_msgs_queue);
+}
+
+static struct cdev hsi_char_cdev;
+
+static int __init hsi_char_init(void)
+{
+	struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+	struct hsi_char_channel *channel = cl_data->channels;
+	unsigned long ch_mask = 0;
+	unsigned int i;
+	int ret;
+
+	if ((max_data_size < 4) || (max_data_size > 0x10000) ||
+		(max_data_size & (max_data_size - 1))) {
+		pr_err("Invalid max read/write data size");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < HSI_CHAR_DEVS && channels_map[i] >= 0; i++) {
+		if (channels_map[i] >= HSI_CHAR_DEVS) {
+			pr_err("Invalid HSI/SSI channel specified");
+			return -EINVAL;
+		}
+		set_bit(channels_map[i], &ch_mask);
+	}
+
+	if (i == 0) {
+		pr_err("No HSI channels available");
+		return -EINVAL;
+	}
+
+	memset(cl_data->channels, 0, sizeof(cl_data->channels));
+	for (i = 0; i < HSI_CHAR_DEVS; i++, channel++) {
+		channel->ch = i;
+		channel->state = HSI_CHST_UNAVAIL;
+		if (test_bit(i, &ch_mask))
+			hsi_char_channel_init(channel);
+	}
+
+	ret = hsi_register_client_driver(&hsi_char_driver);
+	if (ret) {
+		pr_err("Error while registering HSI/SSI driver %d", ret);
+		return ret;
+	}
+
+	pr_info("HSI/SSI char device loaded\n");
+
+	return 0;
+}
+module_init(hsi_char_init);
+
+static void __exit hsi_char_exit(void)
+{
+	device_destroy(hsi_char_class, hsi_char_cdev.dev);
+	class_destroy(hsi_char_class);
+	cdev_del(&hsi_char_cdev);
+	unregister_chrdev_region(hsi_char_dev, HSI_CHAR_DEVS);
+	hsi_unregister_client_driver(&hsi_char_driver);
+	pr_info("HSI char device removed\n");
+}
+module_exit(hsi_char_exit);
+
+MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>");
+MODULE_ALIAS("hsi:hsi_char");
+MODULE_DESCRIPTION("HSI character device");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hsi/controllers/Kconfig b/drivers/hsi/controllers/Kconfig
new file mode 100644
index 00000000000..76d339eaf32
--- /dev/null
+++ b/drivers/hsi/controllers/Kconfig
@@ -0,0 +1,33 @@
+#
+# HSI controllers configuration
+#
+comment "HSI controllers"
+
+config STE_HSI
+       tristate "STE HSI controller driver"
+       depends on (ARCH_U8500 || ARCH_NOMADIK) && HSI
+       default n
+       help
+         ST-Ericsson HSI controller.
+         If you say Y here, you will enable the U8500 HSI hardware driver.
+
+         If unsure, say N.
+
+config OMAP_SSI
+	tristate "OMAP SSI hardware driver"
+	depends on ARCH_OMAP && HSI
+	default n
+	---help---
+	  SSI is a legacy version of HSI. It is usually used to connect
+	  an application engine with a cellular modem.
+	  If you say Y here, you will enable the OMAP SSI hardware driver.
+
+	  If unsure, say N.
+
+if OMAP_SSI
+
+config OMAP_SSI_CONFIG
+	boolean
+	default y
+
+endif # OMAP_SSI
diff --git a/drivers/hsi/controllers/Makefile b/drivers/hsi/controllers/Makefile
new file mode 100644
index 00000000000..475637a0f23
--- /dev/null
+++ b/drivers/hsi/controllers/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for HSI controllers drivers
+#
+
+obj-$(CONFIG_STE_HSI)		+= ste_hsi.o
+obj-$(CONFIG_OMAP_SSI)		+= omap_ssi.o
diff --git a/drivers/hsi/controllers/omap_ssi.c b/drivers/hsi/controllers/omap_ssi.c
new file mode 100644
index 00000000000..a82ea0e13cc
--- /dev/null
+++ b/drivers/hsi/controllers/omap_ssi.c
@@ -0,0 +1,1853 @@
+/*
+ * omap_ssi.c
+ *
+ * Implements the OMAP SSI driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/compiler.h>
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/hsi/hsi.h>
+#include <linux/debugfs.h>
+#include <plat/omap-pm.h>
+#include <plat/clock.h>
+#include <plat/ssi.h>
+
+#define SSI_MAX_CHANNELS	8
+#define SSI_MAX_GDD_LCH		8
+#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
+
+/**
+ * struct ssi_clk_res - Device resource data for the SSI clocks
+ * @clk: Pointer to the clock
+ * @nb: Pointer to the clock notifier for clk, if any
+ */
+struct ssi_clk_res {
+	struct clk *clk;
+	struct notifier_block *nb;
+};
+
+/**
+ * struct gdd_trn - GDD transaction data
+ * @msg: Pointer to the HSI message being served
+ * @sg: Pointer to the current sg entry being served
+ */
+struct gdd_trn {
+	struct hsi_msg		*msg;
+	struct scatterlist	*sg;
+};
+
+/**
+ * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
+ * @mode: Bit transmission mode
+ * @channels: Number of channels
+ * @framesize: Frame size in bits
+ * @timeout: RX frame timeout
+ * @divisor: TX divider
+ * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
+ */
+struct omap_ssm_ctx {
+	u32	mode;
+	u32	channels;
+	u32	frame_size;
+	union	{
+			u32	timeout; /* Rx Only */
+			struct	{
+					u32	arb_mode;
+					u32	divisor;
+			}; /* Tx only */
+	};
+};
+
+/**
+ * struct omap_ssi_port - OMAP SSI port data
+ * @dev: device associated to the port (HSI port)
+ * @sst_dma: SSI transmitter physical base address
+ * @ssr_dma: SSI receiver physical base address
+ * @sst_base: SSI transmitter base address
+ * @ssr_base: SSI receiver base address
+ * @wk_lock: spin lock to serialize access to the wake lines
+ * @lock: Spin lock to serialize access to the SSI port
+ * @channels: Current number of channels configured (1,2,4 or 8)
+ * @txqueue: TX message queues
+ * @rxqueue: RX message queues
+ * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
+ * @irq: IRQ number
+ * @wake_irq: IRQ number for incoming wake line (-1 if none)
+ * @pio_tasklet: Bottom half for PIO transfers and events
+ * @wake_tasklet: Bottom half for incoming wake events
+ * @wkin_cken: Keep track of clock references due to the incoming wake line
+ * @wk_refcount: Reference count for output wake line
+ * @sys_mpu_enable: Context for the interrupt enable register for irq 0
+ * @sst: Context for the synchronous serial transmitter
+ * @ssr: Context for the synchronous serial receiver
+ */
+struct omap_ssi_port {
+	struct device		*dev;
+	dma_addr_t		sst_dma;
+	dma_addr_t		ssr_dma;
+	void __iomem		*sst_base;
+	void __iomem		*ssr_base;
+	spinlock_t		wk_lock;
+	spinlock_t		lock;
+	unsigned int		channels;
+	struct list_head	txqueue[SSI_MAX_CHANNELS];
+	struct list_head	rxqueue[SSI_MAX_CHANNELS];
+	struct list_head	brkqueue;
+	unsigned int		irq;
+	int			wake_irq;
+	struct tasklet_struct	pio_tasklet;
+	struct tasklet_struct	wake_tasklet;
+	unsigned int		wkin_cken:1; /* Workaround */
+	int			wk_refcount;
+	/* OMAP SSI port context */
+	u32			sys_mpu_enable; /* We use only one irq */
+	struct omap_ssm_ctx	sst;
+	struct omap_ssm_ctx	ssr;
+};
+
+/**
+ * struct omap_ssi_controller - OMAP SSI controller data
+ * @dev: device associated to the controller (HSI controller)
+ * @sys: SSI I/O base address
+ * @gdd: GDD I/O base address
+ * @ick: SSI interconnect clock
+ * @fck: SSI functional clock
+ * @ck_refcount: References count for clocks
+ * @gdd_irq: IRQ line for GDD
+ * @gdd_tasklet: bottom half for DMA transfers
+ * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
+ * @lock: lock to serialize access to GDD
+ * @ck_lock: lock to serialize access to the clocks
+ * @loss_count: To follow if we need to restore context or not
+ * @max_speed: Maximum TX speed (Kb/s) set by the clients.
+ * @sysconfig: SSI controller saved context
+ * @gdd_gcr: SSI GDD saved context
+ * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
+ * @port: Array of pointers of the ports of the controller
+ * @dir: Debugfs SSI root directory
+ */
+struct omap_ssi_controller {
+	struct device		*dev;
+	void __iomem		*sys;
+	void __iomem		*gdd;
+	struct clk		*ick;
+	struct clk		*fck;
+	int			ck_refcount;
+	unsigned int		gdd_irq;
+	struct tasklet_struct	gdd_tasklet;
+	struct gdd_trn		gdd_trn[SSI_MAX_GDD_LCH];
+	spinlock_t		lock;
+	spinlock_t		ck_lock;
+	unsigned long		fck_rate;
+	int			loss_count;
+	u32			max_speed;
+	/* OMAP SSI Controller context */
+	u32			sysconfig;
+	u32			gdd_gcr;
+	int			(*get_loss)(struct device *dev);
+	struct omap_ssi_port	**port;
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dir;
+#endif
+};
+
+static inline unsigned int ssi_wakein(struct hsi_port *port)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+	return gpio_get_value(irq_to_gpio(omap_port->wake_irq));
+}
+
+static int ssi_for_each_port(struct hsi_controller *ssi, void *data,
+			int (*fn)(struct omap_ssi_port *p, void *data))
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	unsigned int i = 0;
+	int err = 0;
+
+	for (i = 0; ((i < ssi->num_ports) && !err); i++)
+		err = (*fn)(omap_ssi->port[i], data);
+
+	return err;
+}
+
+static int ssi_set_port_mode(struct omap_ssi_port *omap_port, void *data)
+{
+	u32 *mode = data;
+
+	__raw_writel(*mode, omap_port->sst_base + SSI_SST_MODE_REG);
+	__raw_writel(*mode, omap_port->ssr_base + SSI_SSR_MODE_REG);
+	/* OCP barrier */
+	*mode = __raw_readl(omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+	return 0;
+}
+
+static inline void ssi_set_mode(struct hsi_controller *ssi, u32 mode)
+{
+	ssi_for_each_port(ssi, &mode, ssi_set_port_mode);
+}
+
+static int ssi_restore_port_mode(struct omap_ssi_port *omap_port,
+						void *data __maybe_unused)
+{
+	u32 mode;
+
+	__raw_writel(omap_port->sst.mode,
+				omap_port->sst_base + SSI_SST_MODE_REG);
+	__raw_writel(omap_port->ssr.mode,
+				omap_port->ssr_base + SSI_SSR_MODE_REG);
+	/* OCP barrier */
+	mode =  __raw_readl(omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+	return 0;
+}
+
+static int ssi_restore_divisor(struct omap_ssi_port *omap_port,
+						void *data __maybe_unused)
+{
+	__raw_writel(omap_port->sst.divisor,
+				omap_port->sst_base + SSI_SST_DIVISOR_REG);
+
+	return 0;
+}
+
+static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port,
+						void *data __maybe_unused)
+{
+	struct hsi_port *port = to_hsi_port(omap_port->dev);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem	*base = omap_port->sst_base;
+
+	__raw_writel(omap_port->sys_mpu_enable,
+			omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	/* SST context */
+	__raw_writel(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG);
+	__raw_writel(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG);
+	__raw_writel(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG);
+	/* SSR context */
+	base = omap_port->ssr_base;
+	__raw_writel(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG);
+	__raw_writel(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG);
+	__raw_writel(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG);
+
+	return 0;
+}
+
+static int ssi_save_port_ctx(struct omap_ssi_port *omap_port,
+						void *data __maybe_unused)
+{
+	struct hsi_port *port = to_hsi_port(omap_port->dev);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	omap_port->sys_mpu_enable = __raw_readl(omap_ssi->sys +
+					SSI_MPU_ENABLE_REG(port->num, 0));
+
+	return 0;
+}
+
+static int ssi_clk_enable(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	int err = 0;
+
+	spin_lock_bh(&omap_ssi->ck_lock);
+	if (omap_ssi->ck_refcount++)
+		goto out;
+	err = clk_enable(omap_ssi->fck);
+	if (unlikely(err < 0))
+		goto out;
+	err = clk_enable(omap_ssi->ick);
+	if (unlikely(err < 0)) {
+		clk_disable(omap_ssi->fck);
+		goto out;
+	}
+	if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
+				(*omap_ssi->get_loss)(ssi->device.parent)))
+		goto mode; /* We always need to restore the mode & TX divisor */
+
+	__raw_writel(omap_ssi->sysconfig, omap_ssi->sys + SSI_SYSCONFIG_REG);
+	__raw_writel(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);
+
+	ssi_for_each_port(ssi, NULL, ssi_restore_port_ctx);
+mode:
+	ssi_for_each_port(ssi, NULL, ssi_restore_divisor);
+	ssi_for_each_port(ssi, NULL, ssi_restore_port_mode);
+out:
+	spin_unlock_bh(&omap_ssi->ck_lock);
+
+	return err;
+}
+
+static void ssi_clk_disable(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	spin_lock_bh(&omap_ssi->ck_lock);
+	WARN_ON(omap_ssi->ck_refcount <= 0);
+	if (--omap_ssi->ck_refcount)
+		goto out;
+
+	ssi_set_mode(ssi, SSI_MODE_SLEEP);
+
+	if (omap_ssi->get_loss)
+		omap_ssi->loss_count =
+				(*omap_ssi->get_loss)(ssi->device.parent);
+
+	ssi_for_each_port(ssi, NULL, ssi_save_port_ctx);
+	clk_disable(omap_ssi->ick);
+	clk_disable(omap_ssi->fck);
+out:
+	spin_unlock_bh(&omap_ssi->ck_lock);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused)
+{
+	struct hsi_controller *ssi = m->private;
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem	*sys = omap_ssi->sys;
+
+	ssi_clk_enable(ssi);
+	seq_printf(m, "REVISION\t: 0x%08x\n",
+					__raw_readl(sys + SSI_REVISION_REG));
+	seq_printf(m, "SYSCONFIG\t: 0x%08x\n",
+					__raw_readl(sys + SSI_SYSCONFIG_REG));
+	seq_printf(m, "SYSSTATUS\t: 0x%08x\n",
+					__raw_readl(sys + SSI_SYSSTATUS_REG));
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_debug_port_show(struct seq_file *m, void *p __maybe_unused)
+{
+	struct hsi_port *port = m->private;
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem	*base = omap_ssi->sys;
+	unsigned int ch;
+
+	ssi_clk_enable(ssi);
+	if (omap_port->wake_irq > 0)
+		seq_printf(m, "CAWAKE\t\t: %d\n", ssi_wakein(port));
+	seq_printf(m, "WAKE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_WAKE_REG(port->num)));
+	seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0,
+			__raw_readl(base + SSI_MPU_ENABLE_REG(port->num, 0)));
+	seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0,
+			__raw_readl(base + SSI_MPU_STATUS_REG(port->num, 0)));
+	/* SST */
+	base = omap_port->sst_base;
+	seq_printf(m, "\nSST\n===\n");
+	seq_printf(m, "ID SST\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_ID_REG));
+	seq_printf(m, "MODE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_MODE_REG));
+	seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_FRAMESIZE_REG));
+	seq_printf(m, "DIVISOR\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_DIVISOR_REG));
+	seq_printf(m, "CHANNELS\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_CHANNELS_REG));
+	seq_printf(m, "ARBMODE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_ARBMODE_REG));
+	seq_printf(m, "TXSTATE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_TXSTATE_REG));
+	seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_BUFSTATE_REG));
+	seq_printf(m, "BREAK\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SST_BREAK_REG));
+	for (ch = 0; ch < omap_port->channels; ch++) {
+		seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+				__raw_readl(base + SSI_SST_BUFFER_CH_REG(ch)));
+	}
+	/* SSR */
+	base = omap_port->ssr_base;
+	seq_printf(m, "\nSSR\n===\n");
+	seq_printf(m, "ID SSR\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_ID_REG));
+	seq_printf(m, "MODE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_MODE_REG));
+	seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_FRAMESIZE_REG));
+	seq_printf(m, "CHANNELS\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_CHANNELS_REG));
+	seq_printf(m, "TIMEOUT\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_TIMEOUT_REG));
+	seq_printf(m, "RXSTATE\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_RXSTATE_REG));
+	seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_BUFSTATE_REG));
+	seq_printf(m, "BREAK\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_BREAK_REG));
+	seq_printf(m, "ERROR\t\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_ERROR_REG));
+	seq_printf(m, "ERRORACK\t: 0x%08x\n",
+				__raw_readl(base + SSI_SSR_ERRORACK_REG));
+	for (ch = 0; ch < omap_port->channels; ch++) {
+		seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+				__raw_readl(base + SSI_SSR_BUFFER_CH_REG(ch)));
+	}
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused)
+{
+	struct hsi_controller *ssi = m->private;
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem	*gdd = omap_ssi->gdd;
+	int lch;
+
+	ssi_clk_enable(ssi);
+	seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
+		__raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG));
+	seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
+		__raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
+	seq_printf(m, "HW_ID\t\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_HW_ID_REG));
+	seq_printf(m, "PPORT_ID\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_PPORT_ID_REG));
+	seq_printf(m, "MPORT_ID\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_MPORT_ID_REG));
+	seq_printf(m, "TEST\t\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_TEST_REG));
+	seq_printf(m, "GCR\t\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_GCR_REG));
+
+	for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+		seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
+		seq_printf(m, "CSDP\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CSDP_REG(lch)));
+		seq_printf(m, "CCR\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CCR_REG(lch)));
+		seq_printf(m, "CICR\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CICR_REG(lch)));
+		seq_printf(m, "CSR\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CSR_REG(lch)));
+		seq_printf(m, "CSSA\t\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_CSSA_REG(lch)));
+		seq_printf(m, "CDSA\t\t: 0x%08x\n",
+				__raw_readl(gdd + SSI_GDD_CDSA_REG(lch)));
+		seq_printf(m, "CEN\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CEN_REG(lch)));
+		seq_printf(m, "CSAC\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CSAC_REG(lch)));
+		seq_printf(m, "CDAC\t\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CDAC_REG(lch)));
+		seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
+				__raw_readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
+	}
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_div_get(void *data, u64 *val)
+{
+	struct hsi_port *port = data;
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+
+	ssi_clk_enable(ssi);
+	*val = __raw_readl(omap_port->sst_base + SSI_SST_DIVISOR_REG);
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_div_set(void *data, u64 val)
+{
+	struct hsi_port *port = data;
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+
+	if (val > 127)
+		return -EINVAL;
+
+	ssi_clk_enable(ssi);
+	__raw_writel(val, omap_port->sst_base + SSI_SST_DIVISOR_REG);
+	omap_port->sst.divisor = val;
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_regs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ssi_debug_show, inode->i_private);
+}
+
+static int ssi_port_regs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ssi_debug_port_show, inode->i_private);
+}
+
+static int ssi_gdd_regs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ssi_debug_gdd_show, inode->i_private);
+}
+
+static const struct file_operations ssi_regs_fops = {
+	.open		= ssi_regs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct file_operations ssi_port_regs_fops = {
+	.open		= ssi_port_regs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct file_operations ssi_gdd_regs_fops = {
+	.open		= ssi_gdd_regs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+DEFINE_SIMPLE_ATTRIBUTE(ssi_sst_div_fops, ssi_div_get, ssi_div_set, "%llu\n");
+
+static int __init ssi_debug_add_port(struct omap_ssi_port *omap_port,
+								void *data)
+{
+	struct hsi_port *port = to_hsi_port(omap_port->dev);
+	struct dentry *dir = data;
+
+	dir = debugfs_create_dir(dev_name(omap_port->dev), dir);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops);
+	dir = debugfs_create_dir("sst", dir);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	debugfs_create_file("divisor", S_IRUGO | S_IWUSR, dir, port,
+							&ssi_sst_div_fops);
+
+	return 0;
+}
+
+static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct dentry *dir;
+	int err;
+
+	/* SSI controller */
+	omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
+	if (IS_ERR(omap_ssi->dir))
+		return PTR_ERR(omap_ssi->dir);
+
+	debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
+								&ssi_regs_fops);
+	/* SSI GDD (DMA) */
+	dir = debugfs_create_dir("gdd", omap_ssi->dir);
+	if (IS_ERR(dir))
+		goto rback;
+	debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
+	/* SSI ports */
+	err = ssi_for_each_port(ssi, omap_ssi->dir, ssi_debug_add_port);
+	if (err < 0)
+		goto rback;
+
+	return 0;
+rback:
+	debugfs_remove_recursive(omap_ssi->dir);
+
+	return PTR_ERR(dir);
+}
+
+static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	debugfs_remove_recursive(omap_ssi->dir);
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static int ssi_claim_lch(struct hsi_msg *msg)
+{
+
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	int lch;
+
+	for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++)
+		if (!omap_ssi->gdd_trn[lch].msg) {
+			omap_ssi->gdd_trn[lch].msg = msg;
+			omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl;
+			return lch;
+		}
+
+	return -EBUSY;
+}
+
+static int ssi_start_pio(struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	u32 val;
+
+	ssi_clk_enable(ssi);
+	if (msg->ttype == HSI_MSG_WRITE) {
+		val = SSI_DATAACCEPT(msg->channel);
+		ssi_clk_enable(ssi); /* Hold clocks for pio writes */
+	} else {
+		val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
+	}
+	dev_dbg(&port->device, "Single %s transfer\n",
+						msg->ttype ? "write" : "read");
+	val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	ssi_clk_disable(ssi);
+	msg->actual_len = 0;
+	msg->status = HSI_STATUS_PROCEEDING;
+
+	return 0;
+}
+
+static int ssi_start_dma(struct hsi_msg *msg, int lch)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem *gdd = omap_ssi->gdd;
+	int err;
+	u16 csdp;
+	u16 ccr;
+	u32 s_addr;
+	u32 d_addr;
+	u32 tmp;
+
+	if (msg->ttype == HSI_MSG_READ) {
+		err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+							DMA_FROM_DEVICE);
+		if (err < 0) {
+			dev_dbg(&ssi->device, "DMA map SG failed !\n");
+			return err;
+		}
+		csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
+			SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT |
+			SSI_DATA_TYPE_S32;
+		ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */
+		ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST |
+			SSI_CCR_ENABLE;
+		s_addr = omap_port->ssr_dma +
+					SSI_SSR_BUFFER_CH_REG(msg->channel);
+		d_addr = sg_dma_address(msg->sgt.sgl);
+	} else {
+		err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+							DMA_TO_DEVICE);
+		if (err < 0) {
+			dev_dbg(&ssi->device, "DMA map SG failed !\n");
+			return err;
+		}
+		csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
+			SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT |
+			SSI_DATA_TYPE_S32;
+		ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */
+		ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST |
+			SSI_CCR_ENABLE;
+		s_addr = sg_dma_address(msg->sgt.sgl);
+		d_addr = omap_port->sst_dma +
+					SSI_SST_BUFFER_CH_REG(msg->channel);
+	}
+	dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x"
+			" d_addr %08x\n", lch, csdp, ccr, s_addr, d_addr);
+	ssi_clk_enable(ssi); /* Hold clocks during the transfer */
+	__raw_writew(csdp, gdd + SSI_GDD_CSDP_REG(lch));
+	__raw_writew(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch));
+	__raw_writel(d_addr, gdd + SSI_GDD_CDSA_REG(lch));
+	__raw_writel(s_addr, gdd + SSI_GDD_CSSA_REG(lch));
+	__raw_writew(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length),
+						gdd + SSI_GDD_CEN_REG(lch));
+
+	spin_lock_bh(&omap_ssi->lock);
+	tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	tmp |= SSI_GDD_LCH(lch);
+	__raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	spin_unlock_bh(&omap_ssi->lock);
+	__raw_writew(ccr, gdd + SSI_GDD_CCR_REG(lch));
+	msg->status = HSI_STATUS_PROCEEDING;
+
+	return 0;
+}
+
+static int ssi_start_transfer(struct list_head *queue)
+{
+	struct hsi_msg *msg;
+	int lch = -1;
+
+	if (list_empty(queue))
+		return 0;
+	msg = list_first_entry(queue, struct hsi_msg, link);
+	if (msg->status != HSI_STATUS_QUEUED)
+		return 0;
+	if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32)))
+		lch = ssi_claim_lch(msg);
+	if (lch >= 0)
+		return ssi_start_dma(msg, lch);
+	else
+		return ssi_start_pio(msg);
+}
+
+static void ssi_transfer(struct omap_ssi_port *omap_port,
+							struct list_head *queue)
+{
+	struct hsi_msg *msg;
+	int err = -1;
+
+	spin_lock_bh(&omap_port->lock);
+	while (err < 0) {
+		err = ssi_start_transfer(queue);
+		if (err < 0) {
+			msg = list_first_entry(queue, struct hsi_msg, link);
+			msg->status = HSI_STATUS_ERROR;
+			msg->actual_len = 0;
+			list_del(&msg->link);
+			spin_unlock_bh(&omap_port->lock);
+			msg->complete(msg);
+			spin_lock_bh(&omap_port->lock);
+		}
+	}
+	spin_unlock_bh(&omap_port->lock);
+}
+
+static u32 ssi_calculate_div(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	u32 tx_fckrate = (u32) omap_ssi->fck_rate;
+
+	/* / 2 : SSI TX clock is always half of the SSI functional clock */
+	tx_fckrate >>= 1;
+	/* Round down when tx_fckrate % omap_ssi->max_speed == 0 */
+	tx_fckrate--;
+	dev_dbg(&ssi->device, "TX div %d for fck_rate %lu Khz speed %d Kb/s\n",
+			tx_fckrate / omap_ssi->max_speed, omap_ssi->fck_rate,
+							omap_ssi->max_speed);
+
+	return tx_fckrate / omap_ssi->max_speed;
+}
+
+static void ssi_error(struct hsi_port *port)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg;
+	unsigned int i;
+	u32 err;
+	u32 val;
+	u32 tmp;
+
+	/* ACK error */
+	err = __raw_readl(omap_port->ssr_base + SSI_SSR_ERROR_REG);
+	dev_err(&port->device, "SSI error: 0x%02x\n", err);
+	if (!err) {
+		dev_dbg(&port->device, "spurious SSI error ignored!\n");
+		return;
+	}
+	spin_lock(&omap_ssi->lock);
+	/* Cancel all GDD read transfers */
+	for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) {
+		msg = omap_ssi->gdd_trn[i].msg;
+		if ((msg) && (msg->ttype == HSI_MSG_READ)) {
+			__raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+			val |= (1 << i);
+			omap_ssi->gdd_trn[i].msg = NULL;
+		}
+	}
+	tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	tmp &= ~val;
+	__raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	spin_unlock(&omap_ssi->lock);
+	/* Cancel all PIO read transfers */
+	spin_lock(&omap_port->lock);
+	tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */
+	__raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	/* ACK error */
+	__raw_writel(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG);
+	__raw_writel(SSI_ERROROCCURED,
+			omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+	/* Signal the error all current pending read requests */
+	for (i = 0; i < omap_port->channels; i++) {
+		if (list_empty(&omap_port->rxqueue[i]))
+			continue;
+		msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+									link);
+		list_del(&msg->link);
+		msg->status = HSI_STATUS_ERROR;
+		spin_unlock(&omap_port->lock);
+		msg->complete(msg);
+		/* Now restart queued reads if any */
+		ssi_transfer(omap_port, &omap_port->rxqueue[i]);
+		spin_lock(&omap_port->lock);
+	}
+	spin_unlock(&omap_port->lock);
+}
+
+static void ssi_break_complete(struct hsi_port *port)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg;
+	struct hsi_msg *tmp;
+	u32 val;
+
+	dev_dbg(&port->device, "HWBREAK received\n");
+
+	spin_lock(&omap_port->lock);
+	val = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	val &= ~SSI_BREAKDETECTED;
+	__raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(0, omap_port->ssr_base + SSI_SSR_BREAK_REG);
+	__raw_writel(SSI_BREAKDETECTED,
+			omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+	spin_unlock(&omap_port->lock);
+
+	list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) {
+		msg->status = HSI_STATUS_COMPLETED;
+		spin_lock(&omap_port->lock);
+		list_del(&msg->link);
+		spin_unlock(&omap_port->lock);
+		msg->complete(msg);
+	}
+
+}
+
+static int ssi_async_break(struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	int err = 0;
+	u32 tmp;
+
+	ssi_clk_enable(ssi);
+	if (msg->ttype == HSI_MSG_WRITE) {
+		if (omap_port->sst.mode != SSI_MODE_FRAME) {
+			err = -EINVAL;
+			goto out;
+		}
+		__raw_writel(1, omap_port->sst_base + SSI_SST_BREAK_REG);
+		msg->status = HSI_STATUS_COMPLETED;
+		msg->complete(msg);
+	} else {
+		if (omap_port->ssr.mode != SSI_MODE_FRAME) {
+			err = -EINVAL;
+			goto out;
+		}
+		spin_lock_bh(&omap_port->lock);
+		tmp = __raw_readl(omap_ssi->sys +
+					SSI_MPU_ENABLE_REG(port->num, 0));
+		__raw_writel(tmp | SSI_BREAKDETECTED,
+			omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+		msg->status = HSI_STATUS_PROCEEDING;
+		list_add_tail(&msg->link, &omap_port->brkqueue);
+		spin_unlock_bh(&omap_port->lock);
+	}
+out:
+	ssi_clk_disable(ssi);
+
+	return err;
+}
+
+static int ssi_async(struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct list_head *queue;
+	int err = 0;
+
+	BUG_ON(!msg);
+
+	if (msg->sgt.nents > 1)
+		return -ENOSYS; /* TODO: Add sg support */
+
+	if (msg->break_frame)
+		return ssi_async_break(msg);
+
+	if (msg->ttype) {
+		BUG_ON(msg->channel >= omap_port->sst.channels);
+		queue = &omap_port->txqueue[msg->channel];
+	} else {
+		BUG_ON(msg->channel >= omap_port->ssr.channels);
+		queue = &omap_port->rxqueue[msg->channel];
+	}
+	msg->status = HSI_STATUS_QUEUED;
+	spin_lock_bh(&omap_port->lock);
+	list_add_tail(&msg->link, queue);
+	err = ssi_start_transfer(queue);
+	if (err < 0) {
+		list_del(&msg->link);
+		msg->status = HSI_STATUS_ERROR;
+	}
+	spin_unlock_bh(&omap_port->lock);
+	dev_dbg(&port->device, "msg status %d ttype %d ch %d\n",
+				msg->status, msg->ttype, msg->channel);
+
+	return err;
+}
+
+static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl)
+{
+	struct list_head *node, *tmp;
+	struct hsi_msg *msg;
+
+	list_for_each_safe(node, tmp, queue) {
+		msg = list_entry(node, struct hsi_msg, link);
+		if ((cl) && (cl != msg->cl))
+			continue;
+		list_del(node);
+		pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n",
+			msg->channel, msg, msg->sgt.sgl->length,
+					msg->ttype, msg->context);
+		if (msg->destructor)
+			msg->destructor(msg);
+		else
+			hsi_free_msg(msg);
+	}
+}
+
+static int ssi_setup(struct hsi_client *cl)
+{
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem *sst = omap_port->sst_base;
+	void __iomem *ssr = omap_port->ssr_base;
+	u32 div;
+	u32 val;
+	int err = 0;
+
+	ssi_clk_enable(ssi);
+	spin_lock_bh(&omap_port->lock);
+	if (cl->tx_cfg.speed)
+		omap_ssi->max_speed = cl->tx_cfg.speed;
+	div = ssi_calculate_div(ssi);
+	if (div > SSI_MAX_DIVISOR) {
+		dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n",
+						cl->tx_cfg.speed, div);
+		err = -EINVAL;
+		goto out;
+	}
+	/* Set TX/RX module to sleep to stop TX/RX during cfg update */
+	__raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
+	__raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
+	/* Flush posted write */
+	val = __raw_readl(ssr + SSI_SSR_MODE_REG);
+	/* TX */
+	__raw_writel(31, sst + SSI_SST_FRAMESIZE_REG);
+	__raw_writel(div, sst + SSI_SST_DIVISOR_REG);
+	__raw_writel(cl->tx_cfg.channels, sst + SSI_SST_CHANNELS_REG);
+	__raw_writel(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG);
+	__raw_writel(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG);
+	/* RX */
+	__raw_writel(31, ssr + SSI_SSR_FRAMESIZE_REG);
+	__raw_writel(cl->rx_cfg.channels, ssr + SSI_SSR_CHANNELS_REG);
+	__raw_writel(0, ssr + SSI_SSR_TIMEOUT_REG);
+	/* Cleanup the break queue if we leave FRAME mode */
+	if ((omap_port->ssr.mode == SSI_MODE_FRAME) &&
+		(cl->rx_cfg.mode != SSI_MODE_FRAME))
+		ssi_flush_queue(&omap_port->brkqueue, cl);
+	__raw_writel(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG);
+	omap_port->channels = max(cl->rx_cfg.channels, cl->tx_cfg.channels);
+	/* Shadow registering for OFF mode */
+	/* SST */
+	omap_port->sst.divisor = div;
+	omap_port->sst.frame_size = 31;
+	omap_port->sst.channels = cl->tx_cfg.channels;
+	omap_port->sst.arb_mode = cl->tx_cfg.arb_mode;
+	omap_port->sst.mode = cl->tx_cfg.mode;
+	/* SSR */
+	omap_port->ssr.frame_size = 31;
+	omap_port->ssr.timeout = 0;
+	omap_port->ssr.channels = cl->rx_cfg.channels;
+	omap_port->ssr.mode = cl->rx_cfg.mode;
+out:
+	spin_unlock_bh(&omap_port->lock);
+	ssi_clk_disable(ssi);
+
+	return err;
+}
+
+static void ssi_cleanup_queues(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg;
+	unsigned int i;
+	u32 rxbufstate = 0;
+	u32 txbufstate = 0;
+	u32 status = SSI_ERROROCCURED;
+	u32 tmp;
+
+	ssi_flush_queue(&omap_port->brkqueue, cl);
+	if (list_empty(&omap_port->brkqueue))
+		status |= SSI_BREAKDETECTED;
+
+	for (i = 0; i < omap_port->channels; i++) {
+		if (list_empty(&omap_port->txqueue[i]))
+			continue;
+		msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg,
+									link);
+		if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) {
+			txbufstate |= (1 << i);
+			status |= SSI_DATAACCEPT(i);
+			/* Release the clocks writes, also GDD ones */
+			ssi_clk_disable(ssi);
+		}
+		ssi_flush_queue(&omap_port->txqueue[i], cl);
+	}
+	for (i = 0; i < omap_port->channels; i++) {
+		if (list_empty(&omap_port->rxqueue[i]))
+			continue;
+		msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+									link);
+		if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) {
+			rxbufstate |= (1 << i);
+			status |= SSI_DATAAVAILABLE(i);
+		}
+		ssi_flush_queue(&omap_port->rxqueue[i], cl);
+		/* Check if we keep the error detection interrupt armed */
+		if (!list_empty(&omap_port->rxqueue[i]))
+			status &= ~SSI_ERROROCCURED;
+	}
+	/* Cleanup write buffers */
+	tmp = __raw_readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+	tmp &= ~txbufstate;
+	__raw_writel(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+	/* Cleanup read buffers */
+	tmp = __raw_readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+	tmp &= ~rxbufstate;
+	__raw_writel(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+	/* Disarm and ack pending interrupts */
+	tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	tmp &= ~status;
+	__raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(status, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+}
+
+static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg;
+	unsigned int i;
+	u32 val = 0;
+	u32 tmp;
+
+	for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+		msg = omap_ssi->gdd_trn[i].msg;
+		if ((!msg) || (msg->cl != cl))
+			continue;
+		__raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+		val |= (1 << i);
+		/*
+		 * Clock references for write will be handled in
+		 * ssi_cleanup_queues
+		 */
+		if (msg->ttype == HSI_MSG_READ)
+			ssi_clk_disable(ssi);
+		omap_ssi->gdd_trn[i].msg = NULL;
+	}
+	tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	tmp &= ~val;
+	__raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	__raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+}
+
+static int ssi_release(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	spin_lock_bh(&omap_port->lock);
+	ssi_clk_enable(ssi);
+	/* Stop all the pending DMA requests for that client */
+	ssi_cleanup_gdd(ssi, cl);
+	/* Now cleanup all the queues */
+	ssi_cleanup_queues(cl);
+	ssi_clk_disable(ssi);
+	/* If it is the last client of the port, do extra checks and cleanup */
+	if (port->claimed <= 1) {
+		/*
+		 * Drop the clock reference for the incoming wake line
+		 * if it is still kept high by the other side.
+		 */
+		if (omap_port->wkin_cken) {
+			ssi_clk_disable(ssi);
+			omap_port->wkin_cken = 0;
+		}
+		ssi_clk_enable(ssi);
+		/* Stop any SSI TX/RX without a client */
+		ssi_set_mode(ssi, SSI_MODE_SLEEP);
+		omap_port->sst.mode = SSI_MODE_SLEEP;
+		omap_port->ssr.mode = SSI_MODE_SLEEP;
+		ssi_clk_disable(ssi);
+		WARN_ON(omap_port->wk_refcount != 0);
+		WARN_ON(omap_ssi->ck_refcount != 0);
+	}
+	spin_unlock_bh(&omap_port->lock);
+
+	return 0;
+}
+
+static int ssi_flush(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg;
+	void __iomem *sst = omap_port->sst_base;
+	void __iomem *ssr = omap_port->ssr_base;
+	unsigned int i;
+	u32 err;
+
+	ssi_clk_enable(ssi);
+	spin_lock_bh(&omap_port->lock);
+	/* Stop all DMA transfers */
+	for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+		msg = omap_ssi->gdd_trn[i].msg;
+		if (!msg || (port != hsi_get_port(msg->cl)))
+			continue;
+		__raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+		if (msg->ttype == HSI_MSG_READ)
+			ssi_clk_disable(ssi);
+		omap_ssi->gdd_trn[i].msg = NULL;
+	}
+	/* Flush all SST buffers */
+	__raw_writel(0, sst + SSI_SST_BUFSTATE_REG);
+	__raw_writel(0, sst + SSI_SST_TXSTATE_REG);
+	/* Flush all SSR buffers */
+	__raw_writel(0, ssr + SSI_SSR_RXSTATE_REG);
+	__raw_writel(0, ssr + SSI_SSR_BUFSTATE_REG);
+	/* Flush all errors */
+	err = __raw_readl(ssr + SSI_SSR_ERROR_REG);
+	__raw_writel(err, ssr + SSI_SSR_ERRORACK_REG);
+	/* Flush break */
+	__raw_writel(0, ssr + SSI_SSR_BREAK_REG);
+	/* Clear interrupts */
+	__raw_writel(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(0xffffff00,
+			omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+	__raw_writel(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	__raw_writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+	/* Dequeue all pending requests */
+	for (i = 0; i < omap_port->channels; i++) {
+		/* Release write clocks */
+		if (!list_empty(&omap_port->txqueue[i]))
+			ssi_clk_disable(ssi);
+		ssi_flush_queue(&omap_port->txqueue[i], NULL);
+		ssi_flush_queue(&omap_port->rxqueue[i], NULL);
+	}
+	ssi_flush_queue(&omap_port->brkqueue, NULL);
+	spin_unlock_bh(&omap_port->lock);
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static int ssi_start_tx(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount);
+
+	spin_lock_bh(&omap_port->wk_lock);
+	if (omap_port->wk_refcount++) {
+		spin_unlock_bh(&omap_port->wk_lock);
+		return 0;
+	}
+	ssi_clk_enable(ssi); /* Grab clocks */
+	__raw_writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
+	spin_unlock_bh(&omap_port->wk_lock);
+
+	return 0;
+}
+
+static int ssi_stop_tx(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount);
+
+	spin_lock_bh(&omap_port->wk_lock);
+	BUG_ON(!omap_port->wk_refcount);
+	if (--omap_port->wk_refcount) {
+		spin_unlock_bh(&omap_port->wk_lock);
+		return 0;
+	}
+	__raw_writel(SSI_WAKE(0),
+				omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
+	ssi_clk_disable(ssi); /* Release clocks */
+	spin_unlock_bh(&omap_port->wk_lock);
+
+	return 0;
+}
+
+static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue)
+{
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct hsi_msg *msg;
+	u32 *buf;
+	u32 reg;
+	u32 val;
+
+	spin_lock(&omap_port->lock);
+	msg = list_first_entry(queue, struct hsi_msg, link);
+	if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
+		msg->actual_len = 0;
+		msg->status = HSI_STATUS_PENDING;
+	}
+	if (msg->ttype == HSI_MSG_WRITE)
+		val = SSI_DATAACCEPT(msg->channel);
+	else
+		val = SSI_DATAAVAILABLE(msg->channel);
+	if (msg->status == HSI_STATUS_PROCEEDING) {
+		buf = sg_virt(msg->sgt.sgl) + msg->actual_len;
+		if (msg->ttype == HSI_MSG_WRITE)
+			__raw_writel(*buf, omap_port->sst_base +
+					SSI_SST_BUFFER_CH_REG(msg->channel));
+		 else
+			*buf = __raw_readl(omap_port->ssr_base +
+					SSI_SSR_BUFFER_CH_REG(msg->channel));
+		dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel,
+							msg->ttype, *buf);
+		msg->actual_len += sizeof(*buf);
+		if (msg->actual_len >= msg->sgt.sgl->length)
+			msg->status = HSI_STATUS_COMPLETED;
+		/*
+		 * Wait for the last written frame to be really sent before
+		 * we call the complete callback
+		 */
+		if ((msg->status == HSI_STATUS_PROCEEDING) ||
+				((msg->status == HSI_STATUS_COMPLETED) &&
+					(msg->ttype == HSI_MSG_WRITE))) {
+			__raw_writel(val, omap_ssi->sys +
+					SSI_MPU_STATUS_REG(port->num, 0));
+			spin_unlock(&omap_port->lock);
+
+			return;
+		}
+
+	}
+	/* Transfer completed at this point */
+	reg = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	if (msg->ttype == HSI_MSG_WRITE)
+		ssi_clk_disable(ssi); /* Release clocks for write transfer */
+	reg &= ~val;
+	__raw_writel(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+	list_del(&msg->link);
+	spin_unlock(&omap_port->lock);
+	msg->complete(msg);
+	ssi_transfer(omap_port, queue);
+}
+
+static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
+	struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	unsigned int dir;
+	u32 csr;
+	u32 val;
+
+	spin_lock(&omap_ssi->lock);
+
+	val = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+	val &= ~SSI_GDD_LCH(lch);
+	__raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+
+	if (msg->ttype == HSI_MSG_READ) {
+		dir = DMA_FROM_DEVICE;
+		val = SSI_DATAAVAILABLE(msg->channel);
+		ssi_clk_disable(ssi);
+	} else {
+		dir = DMA_TO_DEVICE;
+		val = SSI_DATAACCEPT(msg->channel);
+		/* Keep clocks reference for write pio event */
+	}
+	dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
+	csr = __raw_readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
+	omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */
+	dev_dbg(&port->device, "DMA completed ch %d ttype %d\n",
+				msg->channel, msg->ttype);
+	spin_unlock(&omap_ssi->lock);
+	if (csr & SSI_CSR_TOUR) { /* Timeout error */
+		msg->status = HSI_STATUS_ERROR;
+		msg->actual_len = 0;
+		spin_lock(&omap_port->lock);
+		list_del(&msg->link); /* Dequeue msg */
+		spin_unlock(&omap_port->lock);
+		msg->complete(msg);
+		return;
+	}
+	spin_lock(&omap_port->lock);
+	val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	__raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	spin_unlock(&omap_port->lock);
+
+	msg->status = HSI_STATUS_COMPLETED;
+	msg->actual_len = sg_dma_len(msg->sgt.sgl);
+}
+
+static void ssi_gdd_tasklet(unsigned long dev)
+{
+	struct hsi_controller *ssi = (struct hsi_controller *)dev;
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem *sys = omap_ssi->sys;
+	unsigned int lch;
+	u32 status_reg;
+
+	ssi_clk_enable(ssi);
+
+	status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+	for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+		if (status_reg & SSI_GDD_LCH(lch))
+			ssi_gdd_complete(ssi, lch);
+	}
+	__raw_writel(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+	status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+	ssi_clk_disable(ssi);
+	if (status_reg)
+		tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+	else
+		enable_irq(omap_ssi->gdd_irq);
+
+}
+
+static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+	disable_irq_nosync(irq);
+
+	return IRQ_HANDLED;
+}
+
+static void ssi_pio_tasklet(unsigned long ssi_port)
+{
+	struct hsi_port *port = (struct hsi_port *)ssi_port;
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	void __iomem *sys = omap_ssi->sys;
+	unsigned int ch;
+	u32 status_reg;
+
+	ssi_clk_enable(ssi);
+	status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+	status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+
+	for (ch = 0; ch < omap_port->channels; ch++) {
+		if (status_reg & SSI_DATAACCEPT(ch))
+			ssi_pio_complete(port, &omap_port->txqueue[ch]);
+		if (status_reg & SSI_DATAAVAILABLE(ch))
+			ssi_pio_complete(port, &omap_port->rxqueue[ch]);
+	}
+	if (status_reg & SSI_BREAKDETECTED)
+		ssi_break_complete(port);
+	if (status_reg & SSI_ERROROCCURED)
+		ssi_error(port);
+
+	status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+	status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+	ssi_clk_disable(ssi);
+
+	if (status_reg)
+		tasklet_hi_schedule(&omap_port->pio_tasklet);
+	else
+		enable_irq(omap_port->irq);
+}
+
+static irqreturn_t ssi_pio_isr(int irq, void *port)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+	tasklet_hi_schedule(&omap_port->pio_tasklet);
+	disable_irq_nosync(irq);
+
+	return IRQ_HANDLED;
+}
+
+static void ssi_wake_tasklet(unsigned long ssi_port)
+{
+	struct hsi_port *port = (struct hsi_port *)ssi_port;
+	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+	if (ssi_wakein(port)) {
+		/**
+		 * We can have a quick High-Low-High transition in the line.
+		 * In such a case if we have long interrupt latencies,
+		 * we can miss the low event or get twice a high event.
+		 * This workaround will avoid breaking the clock reference
+		 * count when such a situation ocurrs.
+		 */
+		spin_lock(&omap_port->lock);
+		if (!omap_port->wkin_cken) {
+			omap_port->wkin_cken = 1;
+			ssi_clk_enable(ssi);
+		}
+		spin_unlock(&omap_port->lock);
+		dev_dbg(&ssi->device, "Wake in high\n");
+		hsi_event(port, HSI_EVENT_START_RX);
+	} else {
+		dev_dbg(&ssi->device, "Wake in low\n");
+		hsi_event(port, HSI_EVENT_STOP_RX);
+		spin_lock(&omap_port->lock);
+		if (omap_port->wkin_cken) {
+			ssi_clk_disable(ssi);
+			omap_port->wkin_cken = 0;
+		}
+		spin_unlock(&omap_port->lock);
+	}
+}
+
+static irqreturn_t ssi_wake_isr(int irq __maybe_unused, void *ssi_port)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(ssi_port);
+
+	tasklet_hi_schedule(&omap_port->wake_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static int __init ssi_port_irq(struct hsi_port *port,
+						struct platform_device *pd)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct resource *irq;
+	int err;
+
+	irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 1);
+	if (!irq) {
+		dev_err(&port->device, "Port IRQ resource missing\n");
+		return -ENXIO;
+	}
+	omap_port->irq = irq->start;
+	tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet,
+							(unsigned long)port);
+	err = devm_request_irq(&pd->dev, omap_port->irq, ssi_pio_isr,
+						IRQF_DISABLED, irq->name, port);
+	if (err < 0)
+		dev_err(&port->device, "Request IRQ %d failed (%d)\n",
+							omap_port->irq, err);
+	return err;
+}
+
+static int __init ssi_wake_irq(struct hsi_port *port,
+						struct platform_device *pd)
+{
+	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+	struct resource *irq;
+	int err;
+
+	irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 3);
+	if (!irq) {
+		dev_err(&port->device, "Wake in IRQ resource missing");
+		return -ENXIO;
+	}
+	if (irq->flags & IORESOURCE_UNSET) {
+		dev_info(&port->device, "No Wake in support\n");
+		omap_port->wake_irq = -1;
+		return 0;
+	}
+	omap_port->wake_irq = irq->start;
+	tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet,
+							(unsigned long)port);
+	err = devm_request_irq(&pd->dev, omap_port->wake_irq, ssi_wake_isr,
+		IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+							irq->name, port);
+	if (err < 0)
+		dev_err(&port->device, "Request Wake in IRQ %d failed %d\n",
+						omap_port->wake_irq, err);
+	err = enable_irq_wake(omap_port->wake_irq);
+	if (err < 0)
+		dev_err(&port->device, "Enable wake on the wakeline in irq %d"
+				" failed %d\n", omap_port->wake_irq, err);
+
+	return err;
+}
+
+static void __init ssi_queues_init(struct omap_ssi_port *omap_port)
+{
+	unsigned int ch;
+
+	for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) {
+		INIT_LIST_HEAD(&omap_port->txqueue[ch]);
+		INIT_LIST_HEAD(&omap_port->rxqueue[ch]);
+	}
+	INIT_LIST_HEAD(&omap_port->brkqueue);
+}
+
+static int __init ssi_get_iomem(struct platform_device *pd,
+		unsigned int num, void __iomem **pbase, dma_addr_t *phy)
+{
+	struct resource *mem;
+	struct resource *ioarea;
+	void __iomem *base;
+
+	mem = platform_get_resource(pd, IORESOURCE_MEM, num);
+	if (!mem) {
+		dev_err(&pd->dev, "IO memory region missing (%d)\n", num);
+		return -ENXIO;
+	}
+	ioarea = devm_request_mem_region(&pd->dev, mem->start,
+					resource_size(mem), dev_name(&pd->dev));
+	if (!ioarea) {
+		dev_err(&pd->dev, "%s IO memory region request failed\n",
+								mem->name);
+		return -ENXIO;
+	}
+	base = devm_ioremap(&pd->dev, mem->start, resource_size(mem));
+	if (!base) {
+		dev_err(&pd->dev, "%s IO remap failed\n", mem->name);
+		return -ENXIO;
+	}
+	*pbase = base;
+
+	if (phy)
+		*phy = mem->start;
+
+	return 0;
+}
+
+static int __init ssi_ports_init(struct hsi_controller *ssi,
+					struct platform_device *pd)
+{
+	struct hsi_port *port;
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	struct omap_ssi_port *omap_port;
+	unsigned int i;
+	int err;
+
+	omap_ssi->port = devm_kzalloc(&pd->dev,
+				sizeof(omap_port) * ssi->num_ports, GFP_KERNEL);
+	if (!omap_ssi->port)
+		return -ENOMEM;
+
+	for (i = 0; i < ssi->num_ports; i++) {
+		port = &ssi->port[i];
+		omap_port = devm_kzalloc(&pd->dev, sizeof(*omap_port),
+								GFP_KERNEL);
+		if (!omap_port)
+			return -ENOMEM;
+		port->async = ssi_async;
+		port->setup = ssi_setup;
+		port->flush = ssi_flush;
+		port->start_tx = ssi_start_tx;
+		port->stop_tx = ssi_stop_tx;
+		port->release = ssi_release;
+		hsi_port_set_drvdata(port, omap_port);
+		/* Get SST base addresses*/
+		err = ssi_get_iomem(pd, ((i * 2) + 2), &omap_port->sst_base,
+							&omap_port->sst_dma);
+		if (err < 0)
+			return err;
+		/* Get SSR base addresses */
+		err = ssi_get_iomem(pd, ((i * 2) + 3), &omap_port->ssr_base,
+							&omap_port->ssr_dma);
+		if (err < 0)
+			return err;
+		err = ssi_port_irq(port, pd);
+		if (err < 0)
+			return err;
+		err = ssi_wake_irq(port, pd);
+		if (err < 0)
+			return err;
+		ssi_queues_init(omap_port);
+		spin_lock_init(&omap_port->lock);
+		spin_lock_init(&omap_port->wk_lock);
+		omap_port->dev = &port->device;
+		omap_ssi->port[i] = omap_port;
+	}
+
+	return 0;
+}
+
+static void ssi_ports_exit(struct hsi_controller *ssi)
+{
+	struct omap_ssi_port *omap_port;
+	unsigned int i;
+
+	for (i = 0; i < ssi->num_ports; i++) {
+		omap_port = hsi_port_drvdata(&ssi->port[i]);
+		tasklet_kill(&omap_port->wake_tasklet);
+		tasklet_kill(&omap_port->pio_tasklet);
+	}
+}
+
+static void ssi_clk_release(struct device *dev __maybe_unused, void *res)
+{
+	struct ssi_clk_res *r = res;
+
+	clk_put(r->clk);
+}
+
+static struct clk *__init ssi_devm_clk_get(struct device *dev, const char *id)
+{
+	struct ssi_clk_res *pclk;
+	struct clk *clk;
+
+	pclk = devres_alloc(ssi_clk_release, sizeof(*pclk), GFP_KERNEL);
+	if (!pclk) {
+		dev_err(dev, "Could not allocate the device resource entry\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	clk = clk_get(dev, id);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "clock get %s failed %li\n", id, PTR_ERR(clk));
+		devres_free(pclk);
+	} else {
+		pclk->clk = clk;
+		devres_add(dev, pclk);
+	}
+
+	return clk;
+}
+
+static int __init ssi_add_controller(struct hsi_controller *ssi,
+						struct platform_device *pd)
+{
+	struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+	struct omap_ssi_controller *omap_ssi;
+	struct resource *irq;
+	int err;
+
+	omap_ssi = devm_kzalloc(&pd->dev, sizeof(*omap_ssi), GFP_KERNEL);
+	if (!omap_ssi) {
+		dev_err(&pd->dev, "not enough memory for omap ssi\n");
+		return -ENOMEM;
+	}
+	ssi->id = pd->id;
+	ssi->owner = THIS_MODULE;
+	ssi->device.parent = &pd->dev;
+	dev_set_name(&ssi->device, "ssi%d", ssi->id);
+	hsi_controller_set_drvdata(ssi, omap_ssi);
+	omap_ssi->dev = &ssi->device;
+	err = ssi_get_iomem(pd, 0, &omap_ssi->sys, NULL);
+	if (err < 0)
+		return err;
+	err = ssi_get_iomem(pd, 1, &omap_ssi->gdd, NULL);
+	if (err < 0)
+		return err;
+	irq = platform_get_resource(pd, IORESOURCE_IRQ, 0);
+	if (!irq) {
+		dev_err(&pd->dev, "GDD IRQ resource missing\n");
+		return -ENXIO;
+	}
+	omap_ssi->gdd_irq = irq->start;
+	tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
+							(unsigned long)ssi);
+	err = devm_request_irq(&pd->dev, omap_ssi->gdd_irq, ssi_gdd_isr,
+						IRQF_DISABLED, irq->name, ssi);
+	if (err < 0) {
+		dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
+							omap_ssi->gdd_irq, err);
+		return err;
+	}
+	err = ssi_ports_init(ssi, pd);
+	if (err < 0)
+		return err;
+	omap_ssi->get_loss = omap_ssi_pdata->get_dev_context_loss_count;
+	omap_ssi->max_speed = UINT_MAX;
+	spin_lock_init(&omap_ssi->lock);
+	spin_lock_init(&omap_ssi->ck_lock);
+	omap_ssi->ick = ssi_devm_clk_get(&pd->dev, "ssi_ick");
+	if (IS_ERR(omap_ssi->ick))
+		return PTR_ERR(omap_ssi->ick);
+	omap_ssi->fck = ssi_devm_clk_get(&pd->dev, "ssi_ssr_fck");
+	if (IS_ERR(omap_ssi->fck))
+		return PTR_ERR(omap_ssi->fck);
+	err = hsi_register_controller(ssi);
+
+	return err;
+}
+
+static int __init ssi_hw_init(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+	unsigned int i;
+	u32 val;
+	int err;
+
+	err = ssi_clk_enable(ssi);
+	if (err < 0) {
+		dev_err(&ssi->device, "Failed to enable the clocks %d\n", err);
+		return err;
+	}
+	/* Reseting SSI controller */
+	__raw_writel(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG);
+	val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+	for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) {
+		msleep(20);
+		val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+	}
+	if (!(val & SSI_RESETDONE)) {
+		dev_err(&ssi->device, "SSI HW reset failed\n");
+		ssi_clk_disable(ssi);
+		return -EIO;
+	}
+	/* Reseting GDD */
+	__raw_writel(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
+	/* Get FCK rate */
+	omap_ssi->fck_rate = clk_get_rate(omap_ssi->fck) / 1000; /* KHz */
+	dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate);
+	/* Set default PM settings */
+	val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART;
+	__raw_writel(val, omap_ssi->sys + SSI_SYSCONFIG_REG);
+	omap_ssi->sysconfig = val;
+	__raw_writel(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
+	omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
+	ssi_clk_disable(ssi);
+
+	return 0;
+}
+
+static void ssi_remove_controller(struct hsi_controller *ssi)
+{
+	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+	ssi_ports_exit(ssi);
+	tasklet_kill(&omap_ssi->gdd_tasklet);
+	hsi_unregister_controller(ssi);
+}
+
+static int __init ssi_probe(struct platform_device *pd)
+{
+	struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+	struct hsi_controller *ssi;
+	int err;
+
+	if (!omap_ssi_pdata) {
+		dev_err(&pd->dev, "No OMAP SSI platform data\n");
+		return -EINVAL;
+	}
+	ssi = hsi_alloc_controller(omap_ssi_pdata->num_ports, GFP_KERNEL);
+	if (!ssi) {
+		dev_err(&pd->dev, "No memory for controller\n");
+		return -ENOMEM;
+	}
+	platform_set_drvdata(pd, ssi);
+	err = ssi_add_controller(ssi, pd);
+	if (err < 0)
+		goto out1;
+	err = ssi_hw_init(ssi);
+	if (err < 0)
+		goto out2;
+#ifdef CONFIG_DEBUG_FS
+	err = ssi_debug_add_ctrl(ssi);
+	if (err < 0)
+		goto out2;
+#endif
+	return err;
+out2:
+	ssi_remove_controller(ssi);
+out1:
+	platform_set_drvdata(pd, NULL);
+	hsi_free_controller(ssi);
+
+	return err;
+}
+
+static int __exit ssi_remove(struct platform_device *pd)
+{
+	struct hsi_controller *ssi = platform_get_drvdata(pd);
+
+#ifdef CONFIG_DEBUG_FS
+	ssi_debug_remove_ctrl(ssi);
+#endif
+	ssi_remove_controller(ssi);
+	platform_set_drvdata(pd, NULL);
+	hsi_free_controller(ssi);
+
+	return 0;
+}
+
+static struct platform_driver ssi_pdriver = {
+	.remove	= __exit_p(ssi_remove),
+	.driver	= {
+			.name	= "omap_ssi",
+			.owner	= THIS_MODULE,
+	},
+};
+
+static int __init omap_ssi_init(void)
+{
+	pr_info("OMAP SSI hw driver loaded\n");
+	return platform_driver_probe(&ssi_pdriver, ssi_probe);
+}
+module_init(omap_ssi_init);
+
+static void __exit omap_ssi_exit(void)
+{
+	platform_driver_unregister(&ssi_pdriver);
+	pr_info("OMAP SSI driver removed\n");
+}
+module_exit(omap_ssi_exit);
+
+MODULE_ALIAS("platform:omap_ssi");
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
+MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hsi/controllers/ste_hsi.c b/drivers/hsi/controllers/ste_hsi.c
new file mode 100644
index 00000000000..beae4ff95b1
--- /dev/null
+++ b/drivers/hsi/controllers/ste_hsi.c
@@ -0,0 +1,1843 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Marcin Mielczarczyk <marcin.mielczarczyk@tieto.com> for ST-Ericsson
+ * Author: Lukasz Baj <lukasz.baj@tieto.com> for ST-Ericsson
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/hsi/hsi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
+#include <linux/mfd/dbx500-prcmu.h>
+
+#ifdef CONFIG_STE_DMA40
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#endif
+
+#include <mach/hsi.h>
+
+/*
+ * Copy of HSIR/HSIT context for restoring after HW reset (Vape power off).
+ */
+struct ste_hsi_hw_context {
+	unsigned int tx_mode;
+	unsigned int tx_divisor;
+	unsigned int tx_channels;
+	unsigned int tx_priority;
+	unsigned int rx_mode;
+	unsigned int rx_channels;
+};
+
+/**
+ * struct ste_hsi_controller - STE HSI controller data
+ * @dev: device associated to STE HSI controller
+ * @tx_dma_base: HSI TX peripheral physical address
+ * @rx_dma_base: HSI RX peripheral physical address
+ * @rx_base: HSI RX peripheral virtual address
+ * @tx_base: HSI TX peripheral virtual address
+ * @regulator: STE HSI Vape consumer regulator
+ * @context: copy of client-configured HSI TX / HSI RX registers
+ * @tx_clk: HSI TX core clock (HSITXCLK)
+ * @rx_clk: HSI RX core clock (HSIRXCLK)
+ * @ssitx_clk: HSI TX host clock (HCLK)
+ * @ssirx_clk: HSI RX host clock (HCLK)
+ * @clk_work: structure for delayed HSI clock disabling
+ * @overrun_irq: HSI channels overrun IRQ table
+ * @ck_refcount: reference count for clock enable operation
+ * @ck_lock: locking primitive for HSI clocks
+ * @lock: locking primitive for HSI controller
+ * @use_dma: flag for DMA enabled
+ * @ck_on: flag for HSI clocks enabled
+ */
+struct ste_hsi_controller {
+	struct device *dev;
+	dma_addr_t tx_dma_base;
+	dma_addr_t rx_dma_base;
+	unsigned char __iomem *rx_base;
+	unsigned char __iomem *tx_base;
+	struct regulator *regulator;
+	struct ste_hsi_hw_context *context;
+	struct clk *tx_clk;
+	struct clk *rx_clk;
+	struct clk *ssitx_clk;
+	struct clk *ssirx_clk;
+	struct delayed_work clk_work;
+	int overrun_irq[STE_HSI_MAX_CHANNELS];
+	int ck_refcount;
+	spinlock_t ck_lock;
+	spinlock_t lock;
+	unsigned int use_dma:1;
+	unsigned int ck_on:1;
+};
+
+#ifdef CONFIG_STE_DMA40
+struct ste_hsi_channel_dma {
+	struct dma_chan *dma_chan;
+	struct dma_async_tx_descriptor *desc;
+	dma_cookie_t cookie;
+};
+#endif
+
+struct ste_hsi_port {
+	struct device *dev;
+	struct list_head txqueue[STE_HSI_MAX_CHANNELS];
+	struct list_head rxqueue[STE_HSI_MAX_CHANNELS];
+	struct list_head brkqueue;
+	int cawake_irq;
+	int acwake_gpio;
+	int tx_irq;
+	int rx_irq;
+	int excep_irq;
+	struct tasklet_struct cawake_tasklet;
+	struct tasklet_struct rx_tasklet;
+	struct tasklet_struct tx_tasklet;
+	struct tasklet_struct exception_tasklet;
+	struct tasklet_struct overrun_tasklet;
+	unsigned char channels;
+#ifdef CONFIG_STE_DMA40
+	struct ste_hsi_channel_dma tx_dma[STE_HSI_MAX_CHANNELS];
+	struct ste_hsi_channel_dma rx_dma[STE_HSI_MAX_CHANNELS];
+#endif
+};
+
+#define hsi_to_ste_port(port) (hsi_port_drvdata(port))
+#define hsi_to_ste_controller(con) (hsi_controller_drvdata(con))
+#define client_to_ste_port(cl) (hsi_port_drvdata(hsi_get_port(cl)))
+#define client_to_hsi(cl) \
+	(to_hsi_controller(hsi_get_port(cl)->device.parent))
+#define client_to_ste_controller(cl)  \
+	(hsi_controller_drvdata(client_to_hsi(cl)))
+#define ste_port_to_ste_controller(port) \
+	((struct ste_hsi_controller *)hsi_controller_drvdata(	\
+		to_hsi_controller(port->dev->parent)))
+
+static u32 ste_hsir_periphid[8] = { 0x2C, 0, 0x8, 0x18, 0xD, 0xF0, 0x5, 0xB1 };
+static u32 ste_hsit_periphid[8] = { 0x2B, 0, 0x8, 0x18, 0xD, 0xF0, 0x5, 0xB1 };
+
+/*
+ * linux/amba/bus.h macros can not be used, because 8 bytes are validated:
+ * PERIPHID0..3 and PCELLID0..3 for HSIR and HSIT.
+ */
+static inline int compare_periphid(u32 *id1, u32 *id2, int count)
+{
+	while (count && *id1++ == *id2++)
+		count--;
+
+	return count;
+}
+
+static void ste_hsi_clk_free(struct clk **pclk)
+{
+	if (IS_ERR(*pclk) && *pclk != NULL)
+		clk_put(*pclk);
+	*pclk = NULL;
+}
+
+static void ste_hsi_init_registers(struct ste_hsi_controller *ste_hsi)
+{
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_BUFSTATE);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_FLUSHBITS);
+	/* TO DO: TX channel priorities will be implemented later */
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_PRIORITY);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_DATASWAP);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_DMAEN);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKID);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIC);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+
+	/* 0x23 is reset value per DB8500 Design Spec */
+	writel(0x23, ste_hsi->rx_base + STE_HSI_RX_THRESHOLD);
+
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_BUFSTATE);
+
+	/* HSIR clock recovery mode */
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_DETECTOR);
+
+	/* Bits 0,1,2 set to 1 to clear exception flags */
+	writel(0x07, ste_hsi->rx_base + STE_HSI_RX_ACK);
+
+	/* Bits 0..7 set to 1 to clear OVERRUN IRQ  */
+	writel(0xFF, ste_hsi->rx_base + STE_HSI_RX_OVERRUNACK);
+
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_DMAEN);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIC);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM);
+
+	/* Flush all errors */
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_EXCEP);
+
+	/* 2 is Flush state, no RX exception generated afterwards */
+	writel(2, ste_hsi->rx_base + STE_HSI_RX_STATE);
+
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+}
+
+static void ste_hsi_setup_registers(struct ste_hsi_controller *ste_hsi)
+{
+	unsigned int buffers, i;
+	struct ste_hsi_hw_context *pcontext = ste_hsi->context;
+
+	/*
+	 * Configure TX
+	 */
+	writel(pcontext->tx_mode, ste_hsi->tx_base + STE_HSI_TX_MODE);
+	writel(pcontext->tx_divisor, ste_hsi->tx_base + STE_HSI_TX_DIVISOR);
+	writel(pcontext->tx_channels, ste_hsi->tx_base + STE_HSI_TX_CHANNELS);
+	writel(pcontext->tx_priority, ste_hsi->tx_base + STE_HSI_TX_PRIORITY);
+
+	/* Calculate buffers number per channel */
+	buffers = STE_HSI_MAX_BUFFERS / pcontext->tx_channels;
+	for (i = 0; i < pcontext->tx_channels; i++) {
+		/* Set 32 bit long frames */
+		writel(31, ste_hsi->tx_base + STE_HSI_TX_FRAMELENX + 4 * i);
+		writel(buffers * i,
+		       ste_hsi->tx_base + STE_HSI_TX_BASEX + 4 * i);
+		writel(buffers - 1,
+		       ste_hsi->tx_base + STE_HSI_TX_SPANX + 4 * i);
+
+	/*
+	 * The DMA burst request and the buffer occupation interrupt are
+	 * asserted when the free space in the corresponding channel buffer
+	 * is greater than the value programmed in TX_WATERMARKX field.
+	 * The field value must be less than the corresponding SPAN value.
+	 */
+#ifdef CONFIG_STE_DMA40
+		writel(STE_HSI_DMA_MAX_BURST-1,
+			ste_hsi->tx_base + STE_HSI_TX_WATERMARKX + 4 * i);
+#else /* IRQ mode */
+		writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKX + 4 * i);
+#endif
+	}
+
+	/*
+	 * The value read from this register gives the synchronized status
+	 * of the transmitter state and this synchronization takes 2 HSITCLK
+	 * cycles plus 3 HCLK cycles.
+	 */
+	while (STE_HSI_STATE_IDLE != readl(ste_hsi->tx_base + STE_HSI_TX_STATE))
+		cpu_relax();
+
+	/*
+	 * Configure RX
+	 */
+	writel(pcontext->rx_mode, ste_hsi->rx_base + STE_HSI_RX_MODE);
+
+	if (STE_HSI_MODE_PIPELINED == pcontext->rx_mode)
+		/*
+		 * 0xFF: The READY line is negated after the start of the
+		 * 256th frame reception in PIPELINED mode.
+		 */
+		writel(0xFF, ste_hsi->rx_base + STE_HSI_RX_FRAMEBURSTCNT);
+	else
+		writel(0, ste_hsi->rx_base + STE_HSI_RX_FRAMEBURSTCNT);
+
+	writel(pcontext->rx_channels, ste_hsi->rx_base + STE_HSI_RX_CHANNELS);
+	/* Calculate buffers number per channel */
+	buffers = STE_HSI_MAX_BUFFERS / pcontext->rx_channels;
+	for (i = 0; i < pcontext->rx_channels; i++) {
+		/* Set 32 bit long frames */
+		writel(31, ste_hsi->rx_base + STE_HSI_RX_FRAMELENX + 4 * i);
+		writel(buffers * i,
+		       ste_hsi->rx_base + STE_HSI_RX_BASEX + 4 * i);
+		writel(buffers - 1,
+		       ste_hsi->rx_base + STE_HSI_RX_SPANX + 4 * i);
+
+	/*
+	 * The DMA burst request and the buffer occupation interrupt are
+	 * asserted when the busy space in the corresponding channel buffer
+	 * is greater than the value programmed in RX_WATERMARKX field.
+	 * The field value must be less than the corresponding SPAN value.
+	 */
+#ifdef CONFIG_STE_DMA40
+		writel(STE_HSI_DMA_MAX_BURST-1,
+			ste_hsi->rx_base + STE_HSI_RX_WATERMARKX + 4 * i);
+#else /* IRQ mode */
+		writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKX + 4 * i);
+#endif
+	}
+
+	/*
+	 * The value read from this register gives the synchronized status
+	 * of the receiver state and this synchronization takes 2 HSIRCLK
+	 * cycles plus 3 HCLK cycles.
+	 */
+	while (STE_HSI_STATE_IDLE != readl(ste_hsi->tx_base + STE_HSI_RX_STATE))
+		cpu_relax();
+}
+
+/*
+ * When cpuidle framework is setting the sleep or deep sleep state then
+ * the Vape is OFF. This results in re-setting the HSIT/HSIR registers
+ * to default (idle) values.
+ * Function ste_hsi_context() is checking and restoring the HSI registers
+ * to these set by the HSI client by ste_hsi_setup().
+ */
+static void ste_hsi_context(struct ste_hsi_controller *ste_hsi)
+{
+	unsigned int tx_channels;
+	unsigned int rx_channels;
+
+
+	tx_channels = readl(ste_hsi->tx_base + STE_HSI_TX_CHANNELS);
+	rx_channels = readl(ste_hsi->rx_base + STE_HSI_RX_CHANNELS);
+
+	/*
+	 * Checking if the context was lost.
+	 * The target config is at least 2 channels for both TX and RX.
+	 * TX and RX channels are set to 1 after HW reset.
+	 */
+	if ((ste_hsi->context->tx_channels != tx_channels) ||
+		(ste_hsi->context->rx_channels != rx_channels)) {
+		/*
+		 * TO DO: remove "dev_info" after thorough testing.
+		 * Debug left for getting the statistics how frequently the context
+		 * is lost during regular HSI operation.
+		 */
+		dev_info(ste_hsi->dev, "context\n");
+
+		ste_hsi_init_registers(ste_hsi);
+		ste_hsi_setup_registers(ste_hsi);
+	}
+}
+
+static void ste_hsi_clks_free(struct ste_hsi_controller *ste_hsi)
+{
+	ste_hsi_clk_free(&ste_hsi->rx_clk);
+	ste_hsi_clk_free(&ste_hsi->tx_clk);
+	ste_hsi_clk_free(&ste_hsi->ssirx_clk);
+	ste_hsi_clk_free(&ste_hsi->ssitx_clk);
+}
+
+static int ste_hsi_clock_enable(struct hsi_controller *hsi)
+{
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	int err = 0;
+
+	spin_lock_bh(&ste_hsi->ck_lock);
+	if (ste_hsi->ck_refcount++ || ste_hsi->ck_on)
+		goto out;
+
+	err = clk_enable(ste_hsi->ssirx_clk);
+	if (unlikely(err))
+		goto out;
+
+	err = clk_enable(ste_hsi->ssitx_clk);
+	if (unlikely(err)) {
+		clk_disable(ste_hsi->ssirx_clk);
+		goto out;
+	}
+
+	err = clk_enable(ste_hsi->rx_clk);
+	if (unlikely(err)) {
+		clk_disable(ste_hsi->ssitx_clk);
+		clk_disable(ste_hsi->ssirx_clk);
+		goto out;
+	}
+
+	err = clk_enable(ste_hsi->tx_clk);
+	if (unlikely(err)) {
+		clk_disable(ste_hsi->rx_clk);
+		clk_disable(ste_hsi->ssitx_clk);
+		clk_disable(ste_hsi->ssirx_clk);
+		goto out;
+	}
+
+	ste_hsi->ck_on = 1;
+out:
+	if (err)
+		ste_hsi->ck_refcount--;
+
+	spin_unlock_bh(&ste_hsi->ck_lock);
+
+	return err;
+}
+
+static void ste_hsi_delayed_disable_clock(struct work_struct *work)
+{
+	struct ste_hsi_controller *ste_hsi;
+	ste_hsi = container_of(work, struct ste_hsi_controller, clk_work.work);
+
+	spin_lock_bh(&ste_hsi->ck_lock);
+
+	/*
+	 * If clock should not be off (enable clock called in meantime)
+	 * or clock is already off nothing to do
+	 */
+	if (ste_hsi->ck_refcount || !ste_hsi->ck_on)
+		goto out;
+
+	if (readl(ste_hsi->tx_base + STE_HSI_TX_STATE) != STE_HSI_STATE_IDLE ||
+	    readl(ste_hsi->rx_base + STE_HSI_RX_STATE)
+	    != STE_HSI_STATE_IDLE ||
+	    readl(ste_hsi->rx_base + STE_HSI_RX_BUFSTATE) != 0) {
+		/* Try again later */
+		int err = schedule_delayed_work(&ste_hsi->clk_work, HZ);
+		if (err < 0)
+			dev_err(ste_hsi->dev, "Error scheduling work\n");
+		goto out;
+	}
+
+	/* Actual clocks disable */
+	clk_disable(ste_hsi->tx_clk);
+	clk_disable(ste_hsi->rx_clk);
+	clk_disable(ste_hsi->ssitx_clk);
+	clk_disable(ste_hsi->ssirx_clk);
+	ste_hsi->ck_on = 0;
+
+out:
+	spin_unlock_bh(&ste_hsi->ck_lock);
+}
+
+static void ste_hsi_clock_disable(struct hsi_controller *hsi)
+{
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+
+	spin_lock_bh(&ste_hsi->ck_lock);
+
+	/* Sanity check */
+	if (ste_hsi->ck_refcount <= 0)
+		WARN_ON(ste_hsi->ck_refcount <= 0);
+
+	/* Need clock to be disable now? */
+	if (--ste_hsi->ck_refcount)
+		goto out;
+
+	/*
+	 * If receiver or transmitter is in the middle something delay clock off
+	 */
+	if (readl(ste_hsi->tx_base + STE_HSI_TX_STATE) != STE_HSI_STATE_IDLE ||
+	    readl(ste_hsi->rx_base + STE_HSI_RX_STATE)
+	    != STE_HSI_STATE_IDLE ||
+	    readl(ste_hsi->rx_base + STE_HSI_RX_BUFSTATE) != 0) {
+		int err = schedule_delayed_work(&ste_hsi->clk_work, HZ);
+		if (err < 0)
+			dev_err(&hsi->device, "Error scheduling work\n");
+
+		goto out;
+	}
+
+	/* Actual clocks disabled */
+	clk_disable(ste_hsi->tx_clk);
+	clk_disable(ste_hsi->rx_clk);
+	clk_disable(ste_hsi->ssitx_clk);
+	clk_disable(ste_hsi->ssirx_clk);
+	ste_hsi->ck_on = 0;
+
+out:
+	spin_unlock_bh(&ste_hsi->ck_lock);
+}
+
+static int ste_hsi_start_irq(struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	u32 val;
+	int err;
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		return err;
+
+	ste_hsi_context(ste_hsi);
+
+	msg->actual_len = 0;
+	msg->status = HSI_STATUS_PROCEEDING;
+
+	if (msg->ttype == HSI_MSG_WRITE) {
+		val = readl(ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM) |
+		    (1 << msg->channel);
+		writel(val, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+	} else {
+		val = readl(ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM) |
+		    (1 << msg->channel);
+		writel(val, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+
+		val = readl(ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM) |
+		    (1 << msg->channel);
+		writel(val, ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM);
+	}
+
+	return 0;
+}
+
+static int ste_hsi_start_transfer(struct ste_hsi_port *ste_port,
+				  struct list_head *queue);
+#ifdef CONFIG_STE_DMA40
+static void ste_hsi_dma_callback(void *dma_async_param)
+{
+	struct hsi_msg *msg = dma_async_param;
+	struct hsi_controller *hsi = client_to_hsi(msg->cl);
+	struct ste_hsi_port *ste_port = client_to_ste_port(msg->cl);
+	struct ste_hsi_controller *ste_hsi = client_to_ste_controller(msg->cl);
+	struct list_head *queue;
+	struct dma_chan *chan;
+	struct ste_hsi_channel_dma *hsi_dma_chan;
+	char *dma_enable_address;
+	enum dma_data_direction direction;
+	u32 dma_mask;
+
+	/* Message finished, remove from list and notify client */
+	spin_lock_bh(&ste_hsi->lock);
+	list_del(&msg->link);
+
+	if (msg->ttype == HSI_MSG_WRITE) {
+		queue = &ste_port->txqueue[msg->channel];
+		direction = DMA_TO_DEVICE;
+		dma_enable_address = ste_hsi->tx_base + STE_HSI_TX_DMAEN;
+		hsi_dma_chan = &ste_port->tx_dma[msg->channel];
+	} else {
+		queue = &ste_port->rxqueue[msg->channel];
+		direction = DMA_FROM_DEVICE;
+		dma_enable_address = ste_hsi->rx_base + STE_HSI_RX_DMAEN;
+		hsi_dma_chan = &ste_port->rx_dma[msg->channel];
+	}
+
+	dma_sync_sg_for_cpu(&hsi->device, msg->sgt.sgl,
+			    msg->sgt.nents, direction);
+	chan = hsi_dma_chan->dma_chan;
+
+	/* disable DMA channel on HSI controller */
+	dma_mask = readl(dma_enable_address);
+	writel(dma_mask & ~(1 << msg->channel), dma_enable_address);
+
+	hsi_dma_chan->desc = NULL;
+
+	dma_unmap_sg(&hsi->device, msg->sgt.sgl, msg->sgt.nents, direction);
+
+	msg->status = HSI_STATUS_COMPLETED;
+	msg->actual_len = sg_dma_len(msg->sgt.sgl);
+
+	spin_unlock_bh(&ste_hsi->lock);
+
+	msg->complete(msg);
+
+	ste_hsi_clock_disable(hsi);
+
+	spin_lock_bh(&ste_hsi->lock);
+	ste_hsi_start_transfer(ste_port, queue);
+	spin_unlock_bh(&ste_hsi->lock);
+}
+
+static void dma_device_control(struct ste_hsi_channel_dma *chan,
+			       enum dma_ctrl_cmd cmd, unsigned long arg)
+{
+	chan->dma_chan->device->device_control(chan->dma_chan, cmd, arg);
+}
+
+static void ste_hsi_terminate_dma_chan(struct ste_hsi_channel_dma *chan)
+{
+	if (chan->desc) {
+		dma_device_control(chan, DMA_TERMINATE_ALL, 0);
+		chan->desc = NULL;
+	}
+	chan->cookie = 0;
+}
+
+static void ste_hsi_terminate_dma(struct ste_hsi_port *ste_port)
+{
+	int i;
+
+	for (i = 0; i < ste_port->channels; ++i) {
+		ste_hsi_terminate_dma_chan(&ste_port->tx_dma[i]);
+		ste_hsi_terminate_dma_chan(&ste_port->rx_dma[i]);
+	}
+}
+
+static int ste_hsi_start_dma(struct hsi_msg *msg)
+{
+	struct hsi_controller *hsi = client_to_hsi(msg->cl);
+	struct ste_hsi_port *ste_port = client_to_ste_port(msg->cl);
+	struct ste_hsi_controller *ste_hsi = client_to_ste_controller(msg->cl);
+	struct dma_async_tx_descriptor *desc;
+	struct dma_chan *chan;
+	struct ste_hsi_channel_dma *hsi_dma_chan;
+	char *dma_enable_address;
+	enum dma_data_direction direction;
+	u32 dma_mask;
+	int err;
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		return err;
+
+	ste_hsi_context(ste_hsi);
+
+	if (msg->ttype == HSI_MSG_WRITE) {
+		direction = DMA_TO_DEVICE;
+		dma_enable_address = ste_hsi->tx_base + STE_HSI_TX_DMAEN;
+		hsi_dma_chan = &ste_port->tx_dma[msg->channel];
+	} else {
+		u32 val;
+		direction = DMA_FROM_DEVICE;
+		dma_enable_address = ste_hsi->rx_base + STE_HSI_RX_DMAEN;
+		hsi_dma_chan = &ste_port->rx_dma[msg->channel];
+
+		/* enable overrun for this channel */
+		val = readl(ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM) |
+		    (1 << msg->channel);
+		writel(val, ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM);
+	}
+
+	chan = hsi_dma_chan->dma_chan;
+
+	if (0 == dma_map_sg(&hsi->device, msg->sgt.sgl, msg->sgt.nents,
+			    direction)) {
+		dev_dbg(&hsi->device, "DMA map SG failed !\n");
+		err = -ENOMEM;
+		goto out;
+	}
+	/* Prepare the scatterlist */
+	desc = chan->device->device_prep_slave_sg(chan,
+						  msg->sgt.sgl,
+						  msg->sgt.nents,
+						  direction,
+						  DMA_PREP_INTERRUPT |
+						  DMA_CTRL_ACK);
+
+	if (!desc) {
+		dma_unmap_sg(&hsi->device, msg->sgt.sgl, msg->sgt.nents,
+			     direction);
+		/* "Complete" DMA (errorpath) */
+		ste_hsi_terminate_dma_chan(hsi_dma_chan);
+		err = -EBUSY;
+		goto out;
+	}
+	desc->callback = ste_hsi_dma_callback;
+	desc->callback_param = msg;
+	hsi_dma_chan->cookie = desc->tx_submit(desc);
+	hsi_dma_chan->desc = desc;
+
+	/* Fire the DMA transaction */
+	chan->device->device_issue_pending(chan);
+
+	/* Enable DMA channel on HSI controller */
+	dma_mask = readl(dma_enable_address);
+	writel(dma_mask | 1 << msg->channel, dma_enable_address);
+
+out:
+	if (unlikely(err))
+		ste_hsi_clock_disable(hsi);
+
+	return err;
+}
+
+static void __init ste_hsi_init_dma(struct ste_hsi_platform_data *data,
+				    struct hsi_controller *hsi)
+{
+	struct hsi_port *port;
+	struct ste_hsi_port *ste_port;
+	struct ste_hsi_controller *ste_hsi = hsi_to_ste_controller(hsi);
+	dma_cap_mask_t mask;
+	int i, ch;
+
+	ste_hsi->use_dma = 1;
+	/* Try to acquire a generic DMA engine slave channel */
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	for (i = 0; i < hsi->num_ports; ++i) {
+		port = &hsi->port[i];
+		ste_port = hsi_port_drvdata(port);
+
+		for (ch = 0; ch < STE_HSI_MAX_CHANNELS; ++ch) {
+			ste_port->tx_dma[ch].dma_chan =
+			    dma_request_channel(mask,
+						data->port_cfg[i].dma_filter,
+						&data->port_cfg[i].
+						dma_tx_cfg[ch]);
+
+			ste_port->rx_dma[ch].dma_chan =
+			    dma_request_channel(mask,
+						data->port_cfg[i].dma_filter,
+						&data->port_cfg[i].
+						dma_rx_cfg[ch]);
+		}
+	}
+}
+
+static int ste_hsi_setup_dma(struct hsi_client *cl)
+{
+	int i;
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct dma_slave_config rx_conf = {
+		.src_addr = 0,	/* dynamic data */
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.direction = DMA_FROM_DEVICE,
+		.src_maxburst = STE_HSI_DMA_MAX_BURST,
+	};
+	struct dma_slave_config tx_conf = {
+		.dst_addr = 0,	/* dynamic data */
+		.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.direction = DMA_TO_DEVICE,
+		.dst_maxburst = STE_HSI_DMA_MAX_BURST,
+	};
+
+	if (!ste_hsi->use_dma)
+		return 0;
+
+	for (i = 0; i < ste_port->channels; ++i) {
+		struct dma_chan *chan;
+
+		chan = ste_port->tx_dma[i].dma_chan;
+		tx_conf.dst_addr = (dma_addr_t) ste_hsi->tx_dma_base +
+		    STE_HSI_TX_BUFFERX + 4 * i;
+		chan->device->device_control(chan,
+					     DMA_SLAVE_CONFIG,
+					     (unsigned long)&tx_conf);
+
+		chan = ste_port->rx_dma[i].dma_chan;
+		rx_conf.src_addr = (dma_addr_t) ste_hsi->rx_dma_base +
+		    STE_HSI_RX_BUFFERX + 4 * i;
+		chan->device->device_control(chan,
+					     DMA_SLAVE_CONFIG,
+					     (unsigned long)&rx_conf);
+	}
+
+	return 0;
+}
+
+#else
+#define ste_hsi_init_dma(data, hsi) do { } while (0)
+#define ste_hsi_start_dma ste_hsi_start_irq
+#define ste_hsi_terminate_dma(ste_port) do { } while (0)
+#define ste_hsi_setup_dma(cl) do { } while (0)
+#endif
+
+static int ste_hsi_start_transfer(struct ste_hsi_port *ste_port,
+				  struct list_head *queue)
+{
+	struct hsi_msg *msg;
+	int err;
+
+	if (list_empty(queue))
+		return 0;
+
+	msg = list_first_entry(queue, struct hsi_msg, link);
+	if (msg->status != HSI_STATUS_QUEUED)
+		return 0;
+
+	msg->actual_len = 0;
+	msg->status = HSI_STATUS_PROCEEDING;
+
+	if (ste_port_to_ste_controller(ste_port)->use_dma)
+		err = ste_hsi_start_dma(msg);
+	else
+		err = ste_hsi_start_irq(msg);
+
+	return err;
+}
+
+static void ste_hsi_receive_data(struct hsi_port *port, unsigned int channel)
+{
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct list_head *queue = &ste_port->rxqueue[channel];
+	struct hsi_msg *msg;
+	char *bufferx;
+	u8 *buf;
+	int span;
+
+	spin_lock_bh(&ste_hsi->lock);
+
+	if (list_empty(queue))
+		goto out;
+
+	msg = list_first_entry(queue, struct hsi_msg, link);
+	if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
+		msg->actual_len = 0;
+		msg->status = HSI_STATUS_PENDING;
+	}
+
+	if (msg->status == HSI_STATUS_PROCEEDING && msg->ttype == HSI_MSG_READ) {
+		unsigned char len;
+		bufferx = ste_hsi->rx_base + STE_HSI_RX_BUFFERX + 4 * channel;
+
+		len = readl(ste_hsi->rx_base + STE_HSI_RX_GAUGEX + 4 * channel);
+		buf = sg_virt(msg->sgt.sgl);
+		buf += msg->actual_len;
+		while (len--) {
+			*(u32 *) buf = readl(bufferx);
+			buf += 4;
+			msg->actual_len += 4;
+			if (msg->actual_len >= msg->sgt.sgl->length) {
+				msg->status = HSI_STATUS_COMPLETED;
+				break;
+			}
+		}
+	}
+
+	/* re-enable interrupt by watermark manipulation */
+	span = readl(ste_hsi->rx_base + STE_HSI_RX_SPANX + 4 * channel);
+	writel(span, ste_hsi->rx_base + STE_HSI_RX_WATERMARKX + 4 * channel);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKX + 4 * channel);
+
+	/*
+	 * If message was not transmitted completely enable interrupt for
+	 * further work
+	 */
+	if (msg->status == HSI_STATUS_PROCEEDING) {
+		u32 val;
+		val = readl(ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM) |
+		    (1 << channel);
+		writel(val, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+		goto out;
+	}
+
+	/* Message finished, remove from list and notify client */
+	list_del(&msg->link);
+	spin_unlock_bh(&ste_hsi->lock);
+	msg->complete(msg);
+
+	ste_hsi_clock_disable(hsi);
+
+	spin_lock_bh(&ste_hsi->lock);
+
+	ste_hsi_start_transfer(ste_port, queue);
+out:
+	spin_unlock_bh(&ste_hsi->lock);
+}
+
+static void ste_hsi_transmit_data(struct hsi_port *port, unsigned int channel)
+{
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct list_head *queue = &ste_port->txqueue[channel];
+	struct hsi_msg *msg;
+	u8 *buf;
+	int span;
+
+	if (list_empty(queue))
+		return;
+
+	spin_lock_bh(&ste_hsi->lock);
+	msg = list_first_entry(queue, struct hsi_msg, link);
+	if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
+		msg->actual_len = 0;
+		msg->status = HSI_STATUS_PENDING;
+	}
+
+	if (msg->status == HSI_STATUS_PROCEEDING &&
+		msg->ttype == HSI_MSG_WRITE) {
+		unsigned char free_space;
+
+		free_space = readl(ste_hsi->tx_base +
+				   STE_HSI_TX_GAUGEX + 4 * channel);
+		buf = sg_virt(msg->sgt.sgl);
+		buf += msg->actual_len;
+		while (free_space--) {
+			writel(*(u32 *) buf, ste_hsi->tx_base +
+			       STE_HSI_TX_BUFFERX + 4 * channel);
+			buf += 4;
+			msg->actual_len += 4;
+			if (msg->actual_len >= msg->sgt.sgl->length) {
+				msg->status = HSI_STATUS_COMPLETED;
+				break;
+			}
+		}
+	}
+
+	span = readl(ste_hsi->tx_base + STE_HSI_TX_SPANX + 4 * channel);
+	writel(span, ste_hsi->tx_base + STE_HSI_TX_WATERMARKX + 4 * channel);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKX + 4 * channel);
+
+	if (msg->status == HSI_STATUS_PROCEEDING) {
+		u32 val;
+		val = readl(ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM) |
+		    (1 << channel);
+		writel(val, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+		goto out;
+	}
+
+	list_del(&msg->link);
+	spin_unlock_bh(&ste_hsi->lock);
+	msg->complete(msg);
+
+	ste_hsi_clock_disable(hsi);
+
+	spin_lock_bh(&ste_hsi->lock);
+	ste_hsi_start_transfer(ste_port, queue);
+out:
+	spin_unlock_bh(&ste_hsi->lock);
+}
+
+static void ste_hsi_cawake_tasklet(unsigned long data)
+{
+	struct hsi_port *port = (struct hsi_port *)data;
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	u32 prcm_line_value;
+	int level;
+
+	prcm_line_value = prcmu_read(DB8500_PRCM_LINE_VALUE);
+	level = (prcm_line_value & DB8500_PRCM_LINE_VALUE_HSI_CAWAKE0) ? 1 : 0;
+
+	dev_info(ste_hsi->dev, "cawake %s\n", level ? "HIGH" : "LOW");
+	hsi_event(hsi->port, level ? HSI_EVENT_START_RX : HSI_EVENT_STOP_RX);
+	enable_irq(ste_port->cawake_irq);
+}
+
+static irqreturn_t ste_hsi_cawake_isr(int irq, void *data)
+{
+	struct hsi_port *port = data;
+
+	/* IRQ processed only if device initialized */
+	if ((port->device.parent) && (data)) {
+		struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+		disable_irq_nosync(irq);
+		tasklet_hi_schedule(&ste_port->cawake_tasklet);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void ste_hsi_rx_tasklet(unsigned long data)
+{
+	struct hsi_port *port = (struct hsi_port *)data;
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	u32 irq_status, irq_mask;
+	unsigned int i;
+
+	irq_status = readl(ste_hsi->rx_base + STE_HSI_RX_WATERMARKMIS);
+	if (!irq_status)
+		goto out;
+
+	irq_mask = readl(ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+	writel(irq_mask & ~irq_status,
+	       ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+	writel(irq_mask, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIC);
+
+	for (i = 0; i < STE_HSI_MAX_CHANNELS; ++i) {
+		if (irq_status & (1 << i))
+			ste_hsi_receive_data(port, i);
+	}
+out:
+	enable_irq(ste_port->rx_irq);
+}
+
+static irqreturn_t ste_hsi_rx_isr(int irq, void *data)
+{
+	struct hsi_port *port = data;
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+	disable_irq_nosync(irq);
+	tasklet_hi_schedule(&ste_port->rx_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ste_hsi_tx_isr(int irq, void *data)
+{
+	struct hsi_port *port = data;
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+	disable_irq_nosync(irq);
+	tasklet_hi_schedule(&ste_port->tx_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static void ste_hsi_tx_tasklet(unsigned long data)
+{
+	struct hsi_port *port = (struct hsi_port *)data;
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	u32 irq_status, irq_mask;
+	unsigned int i;
+
+	irq_status = readl(ste_hsi->tx_base + STE_HSI_TX_WATERMARKMIS);
+	if (!irq_status)
+		goto out;
+
+	irq_mask = readl(ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+	writel(irq_mask & ~irq_status,
+	       ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+	writel(irq_mask, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIC);
+
+	for (i = 0; i < STE_HSI_MAX_CHANNELS; ++i) {
+		if (irq_status & (1 << i))
+			ste_hsi_transmit_data(port, i);
+	}
+out:
+	enable_irq(ste_port->tx_irq);
+}
+
+static void ste_hsi_break_complete(struct hsi_port *port,
+				   struct ste_hsi_controller *ste_hsi)
+{
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_msg *msg, *tmp;
+	u32 mask;
+
+	dev_dbg(port->device.parent, "HWBREAK received\n");
+
+	spin_lock_bh(&ste_hsi->lock);
+
+	mask = readl(ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+	writel(mask & ~STE_HSI_EXCEP_BREAK,
+	       ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+
+	spin_unlock_bh(&ste_hsi->lock);
+
+	list_for_each_entry_safe(msg, tmp, &ste_port->brkqueue, link) {
+		msg->status = HSI_STATUS_COMPLETED;
+		list_del(&msg->link);
+		msg->complete(msg);
+	}
+}
+
+static void ste_hsi_error(struct hsi_port *port)
+{
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_msg *msg;
+	unsigned int i;
+
+	for (i = 0; i < ste_port->channels; i++) {
+		if (list_empty(&ste_port->rxqueue[i]))
+			continue;
+		msg = list_first_entry(&ste_port->rxqueue[i], struct hsi_msg,
+				       link);
+		list_del(&msg->link);
+		msg->status = HSI_STATUS_ERROR;
+		msg->complete(msg);
+		/* Now restart queued reads if any */
+		ste_hsi_start_transfer(ste_port, &ste_port->rxqueue[i]);
+	}
+}
+
+static void ste_hsi_exception_tasklet(unsigned long data)
+{
+	struct hsi_port *port = (struct hsi_port *)data;
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	u32 error_status;
+	u32 error_interrupts;
+
+	error_status = readl(ste_hsi->rx_base + STE_HSI_RX_EXCEP);
+	/*
+	 * sometimes interrupt that cause running this tasklet is already
+	 * inactive so base handling of exception on masked interrupt status
+	 * not on exception state register.
+	 */
+	error_interrupts = readl(ste_hsi->rx_base + STE_HSI_RX_EXCEPMIS);
+
+	if (error_interrupts & STE_HSI_EXCEP_BREAK)
+		ste_hsi_break_complete(port, ste_hsi);
+
+	if (error_interrupts & STE_HSI_EXCEP_TIMEOUT)
+		dev_err(&hsi->device, "timeout exception occurred\n");
+	if (error_interrupts & STE_HSI_EXCEP_OVERRUN)
+		dev_err(&hsi->device, "overrun exception occurred\n");
+	if (error_interrupts & STE_HSI_EXCEP_PARITY)
+		dev_err(&hsi->device, "parity exception occurred\n");
+
+	if (error_interrupts & ~STE_HSI_EXCEP_BREAK)
+		ste_hsi_error(port);
+
+	/* Acknowledge exception interrupts */
+	writel(error_status, ste_hsi->rx_base + STE_HSI_RX_ACK);
+
+	enable_irq(ste_port->excep_irq);
+}
+
+static irqreturn_t ste_hsi_exception_isr(int irq, void *data)
+{
+	struct hsi_port *port = data;
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+	disable_irq_nosync(irq);
+	tasklet_hi_schedule(&ste_port->exception_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static void ste_hsi_overrun_tasklet(unsigned long data)
+{
+	struct hsi_controller *hsi = (struct hsi_controller *)data;
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct hsi_port *hsi_port = &hsi->port[0];
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(hsi_port);
+	struct hsi_msg *msg;
+
+	unsigned int channel;
+	u8 rised_overrun;
+	u8 mask;
+	u8 blocked = 0;
+
+	rised_overrun = (u8) readl(ste_hsi->rx_base + STE_HSI_RX_OVERRUNMIS);
+	mask = rised_overrun;
+	for (channel = 0; mask; ++channel, mask >>= 1) {
+		if (!(mask & 1))
+			continue;
+
+		do {
+			/*
+			 * No more messages, block interrupt
+			 */
+			if (list_empty(&ste_port->rxqueue[channel])) {
+				blocked |= 1 << channel;
+				break;
+			}
+			/*
+			 * Complete with error
+			 */
+			msg = list_first_entry(&ste_port->rxqueue[channel],
+					       struct hsi_msg, link);
+			list_del(&msg->link);
+			msg->status = HSI_STATUS_ERROR;
+			msg->complete(msg);
+
+			/*
+			 * Now restart queued reads if any
+			 * If start_transfer fails, try with next message
+			 */
+			if (ste_hsi_start_transfer(ste_port,
+						   &ste_port->rxqueue[channel]))
+				continue;
+		} while (0);
+	}
+
+	/* Overrun acknowledge */
+	writel(rised_overrun, ste_hsi->rx_base + STE_HSI_RX_OVERRUNACK);
+	writel(~blocked & readl(ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM),
+	       ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM);
+
+	/*
+	 * Enable all that should not be blocked
+	 */
+	mask = rised_overrun & ~blocked;
+	for (channel = 0; mask; ++channel, mask >>= 1)
+		enable_irq(ste_hsi->overrun_irq[channel]);
+}
+
+static irqreturn_t ste_hsi_overrun_isr(int irq, void *data)
+{
+	struct hsi_port *port = data;
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+	disable_irq_nosync(irq);
+	tasklet_hi_schedule(&ste_port->overrun_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static void __init ste_hsi_queues_init(struct ste_hsi_port *ste_port)
+{
+	unsigned int ch;
+
+	for (ch = 0; ch < STE_HSI_MAX_CHANNELS; ch++) {
+		INIT_LIST_HEAD(&ste_port->txqueue[ch]);
+		INIT_LIST_HEAD(&ste_port->rxqueue[ch]);
+	}
+	INIT_LIST_HEAD(&ste_port->brkqueue);
+}
+
+static int __init ste_hsi_get_iomem(struct platform_device *pdev,
+				    const char *res_name,
+				    unsigned char __iomem **base,
+				    dma_addr_t *phy)
+{
+	struct resource *mem;
+	struct resource *ioarea;
+
+	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, res_name);
+	if (!mem) {
+		dev_err(&pdev->dev, "IO memory region missing!\n");
+		return -ENXIO;
+	}
+
+	ioarea = devm_request_mem_region(&pdev->dev, mem->start,
+					 resource_size(mem),
+					 dev_name(&pdev->dev));
+	if (!ioarea) {
+		dev_err(&pdev->dev, "Can't request IO memory region!\n");
+		return -ENXIO;
+	}
+
+	*base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+	if (!base) {
+		dev_err(&pdev->dev, "%s IO remap failed!\n", mem->name);
+		return -ENXIO;
+	}
+	if (phy)
+		*phy = (dma_addr_t) mem->start;
+
+	return 0;
+}
+
+static int __init ste_hsi_acwake_gpio_init(struct platform_device *pdev,
+					   int *gpio)
+{
+	int err = 0;
+	const char *gpio_name = "hsi0_acwake";
+	struct resource *resource;
+
+	resource = platform_get_resource_byname(pdev, IORESOURCE_IO, gpio_name);
+	if (unlikely(!resource)) {
+		dev_err(&pdev->dev, "hsi0_acwake does not exist\n");
+		return -EINVAL;
+	}
+
+	*gpio = resource->start;
+	err = gpio_request(*gpio, gpio_name);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't request GPIO %d\n", *gpio);
+		return err;
+	}
+
+	/* Initial level set to 0 (LOW) */
+	err = gpio_direction_output(*gpio, 0);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't init GPIO %d\n", *gpio);
+		gpio_free(*gpio);
+	}
+
+	return err;
+}
+
+static int __init ste_hsi_get_irq(struct platform_device *pdev,
+				  const char *res_name,
+				  irqreturn_t(*isr) (int, void *), void *data,
+				  int *irq_number)
+{
+	struct resource *irq;
+	int err;
+
+	irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, res_name);
+	if (!irq) {
+		dev_err(&pdev->dev, "IO memory region missing!\n");
+		return -ENXIO;
+	}
+
+	err = devm_request_irq(&pdev->dev, irq->start, isr,
+			       IRQF_DISABLED, irq->name, data);
+	if (err)
+		dev_err(&pdev->dev, "%s IRQ request failed!\n", irq->name);
+
+	if (irq_number)
+		*irq_number = irq->start;
+
+	return err;
+}
+
+static void ste_hsi_flush_queue(struct list_head *queue, struct hsi_client *cl)
+{
+	struct list_head *node, *tmp;
+	struct hsi_msg *msg;
+
+	list_for_each_safe(node, tmp, queue) {
+		msg = list_entry(node, struct hsi_msg, link);
+		if ((cl) && (cl != msg->cl))
+			continue;
+		list_del(node);
+
+		if (msg->destructor)
+			msg->destructor(msg);
+		else
+			hsi_free_msg(msg);
+	}
+}
+
+static int ste_hsi_async_break(struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(msg->cl);
+	struct ste_hsi_port *ste_port = hsi_to_ste_port(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	int err;
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		return err;
+
+	if (msg->ttype == HSI_MSG_WRITE) {
+		if (port->tx_cfg.mode != HSI_MODE_FRAME) {
+			err = -EINVAL;
+			goto out;
+		}
+		writel(1, ste_hsi->tx_base + STE_HSI_TX_BREAK);
+		msg->status = HSI_STATUS_COMPLETED;
+		msg->complete(msg);
+	} else {
+		u32 mask;
+		if (port->rx_cfg.mode != HSI_MODE_FRAME) {
+			err = -EINVAL;
+			goto out;
+		}
+		spin_lock_bh(&ste_hsi->lock);
+		msg->status = HSI_STATUS_PROCEEDING;
+		mask = readl(ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+		/* Enable break exception on controller */
+		if (!(mask & STE_HSI_EXCEP_BREAK))
+			writel(mask | STE_HSI_EXCEP_BREAK,
+			       ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+
+		list_add_tail(&msg->link, &ste_port->brkqueue);
+		spin_unlock_bh(&ste_hsi->lock);
+	}
+
+out:
+	ste_hsi_clock_disable(hsi);
+	return err;
+}
+
+static int ste_hsi_async(struct hsi_msg *msg)
+{
+	struct ste_hsi_controller *ste_hsi;
+	struct ste_hsi_port *ste_port;
+	struct list_head *queue;
+	int err = 0;
+
+	if (unlikely(!msg))
+		return -ENOSYS;
+
+	if (msg->sgt.nents > 1)
+		return -ENOSYS;
+
+	if (unlikely(msg->break_frame))
+		return ste_hsi_async_break(msg);
+
+	ste_port = client_to_ste_port(msg->cl);
+	ste_hsi = client_to_ste_controller(msg->cl);
+
+	if (msg->ttype == HSI_MSG_WRITE) {
+		/* TX transfer */
+		BUG_ON(msg->channel >= ste_port->channels);
+		queue = &ste_port->txqueue[msg->channel];
+	} else {
+		/* RX transfer */
+		queue = &ste_port->rxqueue[msg->channel];
+	}
+
+	spin_lock_bh(&ste_hsi->lock);
+	list_add_tail(&msg->link, queue);
+	msg->status = HSI_STATUS_QUEUED;
+
+	err = ste_hsi_start_transfer(ste_port, queue);
+	if (err)
+		list_del(&msg->link);
+
+	spin_unlock_bh(&ste_hsi->lock);
+
+	return err;
+}
+
+static int ste_hsi_setup(struct hsi_client *cl)
+{
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	int err;
+	u32 div = 0;
+	int ch;
+
+	if (ste_hsi->regulator)
+		regulator_enable(ste_hsi->regulator);
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		return err;
+
+	if (cl->tx_cfg.speed) {
+		div = clk_get_rate(ste_hsi->tx_clk) / 1000 / cl->tx_cfg.speed;
+		if (div)
+			--div;
+	}
+
+	if (!ste_hsi->context)
+		ste_hsi->context = kzalloc(sizeof(struct ste_hsi_hw_context), GFP_KERNEL);
+
+	if (!ste_hsi->context) {
+		dev_err(ste_hsi->dev, "Not enough memory for context!\n");
+		return -ENOMEM;
+	} else {
+		/* Save HSI context */
+		ste_hsi->context->tx_mode = cl->tx_cfg.mode;
+		ste_hsi->context->tx_divisor = div;
+		ste_hsi->context->tx_channels = cl->tx_cfg.channels;
+		ste_hsi->context->tx_priority = 0;
+		if (HSI_ARB_PRIO == cl->tx_cfg.arb_mode)
+			for (ch = 0; ch < STE_HSI_MAX_CHANNELS; ch++)
+				if (cl->tx_cfg.ch_prio[ch])
+					ste_hsi->context->tx_priority |=
+								(1 << ch);
+
+		if ((HSI_FLOW_PIPE == cl->rx_cfg.flow) &&
+			(HSI_MODE_FRAME == cl->rx_cfg.mode))
+			ste_hsi->context->rx_mode = STE_HSI_MODE_PIPELINED;
+		else
+			ste_hsi->context->rx_mode = cl->rx_cfg.mode;
+
+		ste_hsi->context->rx_channels = cl->rx_cfg.channels;
+	}
+
+	port->tx_cfg = cl->tx_cfg;
+	port->rx_cfg = cl->rx_cfg;
+
+	ste_hsi_setup_registers(ste_hsi);
+
+	ste_port->channels = max(cl->tx_cfg.channels, cl->rx_cfg.channels);
+
+	ste_hsi_setup_dma(cl);
+
+	ste_hsi_clock_disable(hsi);
+
+	if (ste_hsi->regulator)
+		regulator_disable(ste_hsi->regulator);
+
+	return err;
+}
+
+static int ste_hsi_flush(struct hsi_client *cl)
+{
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	int i;
+
+	ste_hsi_clock_enable(hsi);
+
+	/* Enter sleep mode */
+	writel(STE_HSI_MODE_SLEEP, ste_hsi->rx_base + STE_HSI_RX_MODE);
+
+	/* Disable DMA, and terminate all outstanding jobs */
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_DMAEN);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_DMAEN);
+	ste_hsi_terminate_dma(ste_port);
+
+	/* Flush HSIT buffers */
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_STATE);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_BUFSTATE);
+
+	/* Flush HSIR pipeline and channel buffers */
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_STATE);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_PIPEGAUGE);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_BUFSTATE);
+
+	/* Flush all errors */
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_EXCEP);
+
+	/* Clear interrupts */
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIM);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_WATERMARKIC);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIM);
+	writel(0, ste_hsi->tx_base + STE_HSI_TX_WATERMARKIC);
+	writel(0xFF, ste_hsi->rx_base + STE_HSI_RX_OVERRUNACK);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_OVERRUNIM);
+	writel(0, ste_hsi->rx_base + STE_HSI_RX_EXCEPIM);
+	writel(0x0F, ste_hsi->rx_base + STE_HSI_RX_ACK);
+
+	/* Dequeue all pending requests */
+	for (i = 0; i < ste_port->channels; i++) {
+		/* Release write clocks */
+		if (!list_empty(&ste_port->txqueue[i]))
+			ste_hsi_clock_disable(hsi);
+		if (!list_empty(&ste_port->rxqueue[i]))
+			ste_hsi_clock_disable(hsi);
+		ste_hsi_flush_queue(&ste_port->txqueue[i], NULL);
+		ste_hsi_flush_queue(&ste_port->rxqueue[i], NULL);
+	}
+	ste_hsi_flush_queue(&ste_port->brkqueue, NULL);
+
+	ste_hsi_clock_disable(hsi);
+
+	return 0;
+}
+
+static int ste_hsi_start_tx(struct hsi_client *cl)
+{
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+
+	if (ste_hsi->regulator)
+		regulator_enable(ste_hsi->regulator);
+
+	gpio_set_value(ste_port->acwake_gpio, 1); /* HIGH */
+
+	return 0;
+}
+
+static int ste_hsi_stop_tx(struct hsi_client *cl)
+{
+	struct hsi_port *port = to_hsi_port(cl->device.parent);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+	struct hsi_controller *hsi = to_hsi_controller(port->device.parent);
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+
+	gpio_set_value(ste_port->acwake_gpio, 0); /* LOW */
+
+	if (ste_hsi->regulator)
+		regulator_disable(ste_hsi->regulator);
+
+	return 0;
+}
+
+static int ste_hsi_release(struct hsi_client *cl)
+{
+	int err;
+	struct ste_hsi_controller *ste_hsi = client_to_ste_controller(cl);
+
+	err = ste_hsi_flush(cl);
+	cancel_delayed_work(&ste_hsi->clk_work);
+
+	return 0;
+}
+
+static int ste_hsi_ports_init(struct hsi_controller *hsi,
+			      struct platform_device *pdev)
+{
+	struct hsi_port *port;
+	struct ste_hsi_port *ste_port;
+	unsigned int i;
+	char irq_name[20];
+	int err;
+
+	for (i = 0; i < hsi->num_ports; i++) {
+		ste_port = devm_kzalloc(&pdev->dev, sizeof *ste_port,
+					GFP_KERNEL);
+		if (!ste_port)
+			return -ENOMEM;
+
+		port = &hsi->port[i];
+		port->async = ste_hsi_async;
+		port->setup = ste_hsi_setup;
+		port->flush = ste_hsi_flush;
+		port->start_tx = ste_hsi_start_tx;
+		port->stop_tx = ste_hsi_stop_tx;
+		port->release = ste_hsi_release;
+		hsi_port_set_drvdata(port, ste_port);
+		ste_port->dev = &port->device;
+
+		err = ste_hsi_acwake_gpio_init(pdev, &ste_port->acwake_gpio);
+		if (err)
+			return err;
+
+		sprintf(irq_name, "hsi0_cawake");
+		err = ste_hsi_get_irq(pdev, irq_name, ste_hsi_cawake_isr, port,
+				      &ste_port->cawake_irq);
+		if (err)
+			return err;
+
+		sprintf(irq_name, "hsi_rx_irq%d", i);
+		err = ste_hsi_get_irq(pdev, irq_name, ste_hsi_rx_isr, port,
+				      &ste_port->rx_irq);
+		if (err)
+			return err;
+
+		sprintf(irq_name, "hsi_tx_irq%d", i);
+		err = ste_hsi_get_irq(pdev, irq_name, ste_hsi_tx_isr, port,
+				      &ste_port->tx_irq);
+		if (err)
+			return err;
+
+		tasklet_init(&ste_port->cawake_tasklet, ste_hsi_cawake_tasklet,
+			     (unsigned long)port);
+
+		tasklet_init(&ste_port->rx_tasklet, ste_hsi_rx_tasklet,
+			     (unsigned long)port);
+
+		tasklet_init(&ste_port->tx_tasklet, ste_hsi_tx_tasklet,
+			     (unsigned long)port);
+
+		tasklet_init(&ste_port->exception_tasklet,
+			     ste_hsi_exception_tasklet, (unsigned long)port);
+
+		tasklet_init(&ste_port->overrun_tasklet,
+			     ste_hsi_overrun_tasklet, (unsigned long)port);
+
+		sprintf(irq_name, "hsi_rx_excep%d", i);
+		err = ste_hsi_get_irq(pdev, irq_name, ste_hsi_exception_isr,
+				      port, &ste_port->excep_irq);
+		if (err)
+			return err;
+
+		ste_hsi_queues_init(ste_port);
+	}
+	return 0;
+}
+
+static int __init ste_hsi_hw_init(struct hsi_controller *hsi)
+{
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	int err;
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		return err;
+
+	ste_hsi_init_registers(ste_hsi);
+
+	ste_hsi_clock_disable(hsi);
+
+	return err;
+}
+
+static int __init ste_hsi_add_controller(struct hsi_controller *hsi,
+					 struct platform_device *pdev)
+{
+	struct ste_hsi_controller *ste_hsi;
+	char overrun_name[] = "hsi_rx_overrun_chxxx";
+	unsigned char i;
+	int err;
+	unsigned long rate;
+
+	ste_hsi = kzalloc(sizeof(struct ste_hsi_controller), GFP_KERNEL);
+	if (!ste_hsi) {
+		dev_err(&pdev->dev, "Not enough memory for ste_hsi!\n");
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&ste_hsi->lock);
+	spin_lock_init(&ste_hsi->ck_lock);
+	INIT_DELAYED_WORK(&ste_hsi->clk_work, ste_hsi_delayed_disable_clock);
+
+	hsi->id = pdev->id;
+	hsi->device.parent = &pdev->dev;
+	dev_set_name(&hsi->device, "ste-hsi.%d", hsi->id);
+	ste_hsi->dev = &hsi->device;
+	hsi_controller_set_drvdata(hsi, ste_hsi);
+
+	/* Get and enable regulator */
+	ste_hsi->regulator = regulator_get(&pdev->dev, "v-hsi");
+	if (IS_ERR(ste_hsi->regulator)) {
+		dev_err(&pdev->dev, "could not get v-hsi regulator\n");
+		ste_hsi->regulator = NULL;
+	} else {
+		regulator_enable(ste_hsi->regulator);
+	}
+
+	/* Get and reserve resources for receiver */
+	err = ste_hsi_get_iomem(pdev, "hsi_rx_base", &ste_hsi->rx_base,
+				&ste_hsi->rx_dma_base);
+	if (err)
+		goto err_free_mem;
+	dev_info(&pdev->dev, "hsi_rx_base = %p\n", ste_hsi->rx_base);
+
+	/* Get and reserve resources for transmitter */
+	err = ste_hsi_get_iomem(pdev, "hsi_tx_base", &ste_hsi->tx_base,
+				&ste_hsi->tx_dma_base);
+	if (err)
+		goto err_free_mem;
+	dev_info(&pdev->dev, "hsi_tx_base = %p\n", ste_hsi->tx_base);
+
+	/* Get HSIT HSITXCLK clock */
+	ste_hsi->tx_clk = clk_get(&pdev->dev, "hsit_hsitxclk");
+	if (IS_ERR(ste_hsi->tx_clk)) {
+		dev_err(&hsi->device, "Couldn't get HSIT HSITXCLK clock\n");
+		err = PTR_ERR(ste_hsi->tx_clk);
+		goto err_free_mem;
+	}
+
+	/* Get HSIR HSIRXCLK clock */
+	ste_hsi->rx_clk = clk_get(&pdev->dev, "hsir_hsirxclk");
+	if (IS_ERR(ste_hsi->rx_clk)) {
+		dev_err(&hsi->device, "Couldn't get HSIR HSIRXCLK clock\n");
+		err = PTR_ERR(ste_hsi->rx_clk);
+		goto err_clk_free;
+	}
+
+	/* Get HSIT HCLK clock */
+	ste_hsi->ssitx_clk = clk_get(&pdev->dev, "hsit_hclk");
+	if (IS_ERR(ste_hsi->ssitx_clk)) {
+		dev_err(&hsi->device, "Couldn't get HSIT HCLK clock\n");
+		err = PTR_ERR(ste_hsi->ssitx_clk);
+		goto err_clk_free;
+	}
+
+	/* Get HSIR HCLK clock */
+	ste_hsi->ssirx_clk = clk_get(&pdev->dev, "hsir_hclk");
+	if (IS_ERR(ste_hsi->ssirx_clk)) {
+		dev_err(&hsi->device, "Couldn't get HSIR HCLK clock\n");
+		err = PTR_ERR(ste_hsi->ssirx_clk);
+		goto err_clk_free;
+	}
+
+	/* Set HSITXCLK rate to 100 MHz */
+	rate = clk_round_rate(ste_hsi->tx_clk, 100000000);
+	err = clk_set_rate(ste_hsi->tx_clk, rate);
+	if (unlikely(err)) {
+		dev_err(&hsi->device, "Couldn't set HSIT clock rate\n");
+		goto err_clk_free;
+	}
+
+	/* Set HSIRXCLK rate to 200 MHz */
+	rate = clk_round_rate(ste_hsi->rx_clk, 200000000);
+	err = clk_set_rate(ste_hsi->rx_clk, rate);
+	if (unlikely(err)) {
+		dev_err(&hsi->device, "Couldn't set HSIR clock rate\n");
+		goto err_clk_free;
+	}
+
+	err = ste_hsi_clock_enable(hsi);
+	if (unlikely(err))
+		goto err_clk_free;
+
+	/* Check if controller is at specified address */
+	if (compare_periphid(ste_hsir_periphid,
+			     (u32 *) (ste_hsi->rx_base + 0xFE0), 8)) {
+		dev_err(&pdev->dev, "No hsir controller at = %p\n",
+			ste_hsi->rx_base);
+		err = -ENXIO;
+		goto err_clk_free;
+	}
+
+	/* Check if controller is at specified address */
+	if (compare_periphid(ste_hsit_periphid,
+			     (u32 *) (ste_hsi->tx_base + 0xFE0), 8)) {
+		dev_err(&pdev->dev, "No hsit controller at = %p\n",
+			ste_hsi->tx_base);
+		err = -ENXIO;
+		goto err_clk_free;
+	}
+	ste_hsi_clock_disable(hsi);
+
+	err = ste_hsi_hw_init(hsi);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to init HSI controller!\n");
+		goto err_clk_free;
+	}
+
+	for (i = 0; i < STE_HSI_MAX_CHANNELS; i++) {
+		sprintf(overrun_name, "hsi_rx_overrun_ch%d", i);
+		err = ste_hsi_get_irq(pdev, overrun_name, ste_hsi_overrun_isr,
+				      hsi, &ste_hsi->overrun_irq[i]);
+		if (err)
+			goto err_clk_free;
+	}
+
+	err = ste_hsi_ports_init(hsi, pdev);
+	if (err)
+		goto err_clk_free;
+
+	err = hsi_register_controller(hsi);
+
+	if (ste_hsi->regulator)
+		regulator_disable(ste_hsi->regulator);
+
+	if (err)
+		goto err_clk_free;
+
+	return 0;
+
+err_clk_free:
+	ste_hsi_clks_free(ste_hsi);
+err_free_mem:
+	kfree(ste_hsi);
+	return err;
+}
+
+static int ste_hsi_remove_controller(struct hsi_controller *hsi,
+				     struct platform_device *pdev)
+{
+	struct ste_hsi_controller *ste_hsi = hsi_controller_drvdata(hsi);
+	struct hsi_port *port = to_hsi_port(&pdev->dev);
+	struct ste_hsi_port *ste_port = hsi_port_drvdata(port);
+
+	if (ste_hsi->regulator)
+		regulator_put(ste_hsi->regulator);
+
+	gpio_free(ste_port->acwake_gpio);
+
+	ste_hsi_clks_free(ste_hsi);
+	hsi_unregister_controller(hsi);
+
+	kfree(ste_hsi->context);
+	kfree(ste_hsi);
+
+	return 0;
+}
+
+static int __init ste_hsi_probe(struct platform_device *pdev)
+{
+	struct hsi_controller *hsi;
+	struct ste_hsi_platform_data *pdata = pdev->dev.platform_data;
+	int err;
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "No HSI platform data!\n");
+		return -EINVAL;
+	}
+
+	hsi = hsi_alloc_controller(pdata->num_ports, GFP_KERNEL);
+	if (!hsi) {
+		dev_err(&pdev->dev, "No memory to allocate HSI controller!\n");
+		return -ENOMEM;
+	}
+	platform_set_drvdata(pdev, hsi);
+
+	err = ste_hsi_add_controller(hsi, pdev);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't add HSI controller!\n");
+		goto err_free_controller;
+	}
+
+	if (pdata->use_dma)
+		ste_hsi_init_dma(pdata, hsi);
+
+	return 0;
+
+err_free_controller:
+	platform_set_drvdata(pdev, NULL);
+	hsi_free_controller(hsi);
+
+	return err;
+}
+
+static int __exit ste_hsi_remove(struct platform_device *pdev)
+{
+	struct hsi_controller *hsi = platform_get_drvdata(pdev);
+
+	ste_hsi_remove_controller(hsi, pdev);
+	hsi_free_controller(hsi);
+
+	return 0;
+}
+
+static struct platform_driver ste_hsi_driver __refdata = {
+	.driver = {
+		   .name = "ste_hsi",
+		   .owner = THIS_MODULE,
+		   },
+	.remove = __exit_p(ste_hsi_remove),
+};
+
+static int __init ste_hsi_init(void)
+{
+	return platform_driver_probe(&ste_hsi_driver, ste_hsi_probe);
+}
+module_init(ste_hsi_init)
+
+static void __exit ste_hsi_exit(void)
+{
+	platform_driver_unregister(&ste_hsi_driver);
+}
+module_exit(ste_hsi_exit)
+
+MODULE_AUTHOR("Lukasz Baj <lukasz.baj@tieto.com");
+MODULE_DESCRIPTION("STE HSI driver.");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
new file mode 100644
index 00000000000..06b574394cd
--- /dev/null
+++ b/drivers/hsi/hsi.c
@@ -0,0 +1,496 @@
+/*
+ * hsi.c
+ *
+ * HSI core.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/hsi/hsi.h>
+#include <linux/compiler.h>
+#include <linux/rwsem.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include "hsi_core.h"
+
+static struct device_type hsi_ctrl = {
+	.name	= "hsi_controller",
+};
+
+static struct device_type hsi_cl = {
+	.name	= "hsi_client",
+};
+
+static struct device_type hsi_port = {
+	.name	= "hsi_port",
+};
+
+static ssize_t modalias_show(struct device *dev,
+			struct device_attribute *a __maybe_unused, char *buf)
+{
+	return sprintf(buf, "hsi:%s\n", dev_name(dev));
+}
+
+static struct device_attribute hsi_bus_dev_attrs[] = {
+	__ATTR_RO(modalias),
+	__ATTR_NULL,
+};
+
+static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	if (dev->type == &hsi_cl)
+		add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
+
+	return 0;
+}
+
+static int hsi_bus_match(struct device *dev, struct device_driver *driver)
+{
+	return strcmp(dev_name(dev), driver->name) == 0;
+}
+
+static struct bus_type hsi_bus_type = {
+	.name		= "hsi",
+	.dev_attrs	= hsi_bus_dev_attrs,
+	.match		= hsi_bus_match,
+	.uevent		= hsi_bus_uevent,
+};
+
+static void hsi_client_release(struct device *dev)
+{
+	kfree(to_hsi_client(dev));
+}
+
+static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
+{
+	struct hsi_client *cl;
+	unsigned long flags;
+
+	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+	if (!cl)
+		return;
+	cl->device.type = &hsi_cl;
+	cl->tx_cfg = info->tx_cfg;
+	cl->rx_cfg = info->rx_cfg;
+	cl->device.bus = &hsi_bus_type;
+	cl->device.parent = &port->device;
+	cl->device.release = hsi_client_release;
+	dev_set_name(&cl->device, info->name);
+	cl->device.platform_data = info->platform_data;
+	spin_lock_irqsave(&port->clock, flags);
+	list_add_tail(&cl->link, &port->clients);
+	spin_unlock_irqrestore(&port->clock, flags);
+	if (info->archdata)
+		cl->device.archdata = *info->archdata;
+	if (device_register(&cl->device) < 0) {
+		pr_err("hsi: failed to register client: %s\n", info->name);
+		kfree(cl);
+	}
+}
+
+static void hsi_scan_board_info(struct hsi_controller *hsi)
+{
+	struct hsi_cl_info *cl_info;
+	struct hsi_port	*p;
+
+	list_for_each_entry(cl_info, &hsi_board_list, list)
+		if (cl_info->info.hsi_id == hsi->id) {
+			p = hsi_find_port_num(hsi, cl_info->info.port);
+			if (!p)
+				continue;
+			hsi_new_client(p, &cl_info->info);
+		}
+}
+
+static int hsi_remove_client(struct device *dev, void *data __maybe_unused)
+{
+	struct hsi_client *cl = to_hsi_client(dev);
+	struct hsi_port *port = to_hsi_port(dev->parent);
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->clock, flags);
+	list_del(&cl->link);
+	spin_unlock_irqrestore(&port->clock, flags);
+	device_unregister(dev);
+
+	return 0;
+}
+
+static int hsi_remove_port(struct device *dev, void *data __maybe_unused)
+{
+	device_for_each_child(dev, NULL, hsi_remove_client);
+	device_unregister(dev);
+
+	return 0;
+}
+
+static void hsi_controller_release(struct device *dev __maybe_unused)
+{
+}
+
+static void hsi_port_release(struct device *dev __maybe_unused)
+{
+}
+
+/**
+ * hsi_unregister_controller - Unregister an HSI controller
+ * @hsi: The HSI controller to register
+ */
+void hsi_unregister_controller(struct hsi_controller *hsi)
+{
+	device_for_each_child(&hsi->device, NULL, hsi_remove_port);
+	device_unregister(&hsi->device);
+}
+EXPORT_SYMBOL_GPL(hsi_unregister_controller);
+
+/**
+ * hsi_register_controller - Register an HSI controller and its ports
+ * @hsi: The HSI controller to register
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_register_controller(struct hsi_controller *hsi)
+{
+	unsigned int i;
+	int err;
+
+	hsi->device.type = &hsi_ctrl;
+	hsi->device.bus = &hsi_bus_type;
+	hsi->device.release = hsi_controller_release;
+	err = device_register(&hsi->device);
+	if (err < 0)
+		return err;
+	for (i = 0; i < hsi->num_ports; i++) {
+		hsi->port[i].device.parent = &hsi->device;
+		hsi->port[i].device.bus = &hsi_bus_type;
+		hsi->port[i].device.release = hsi_port_release;
+		hsi->port[i].device.type = &hsi_port;
+		INIT_LIST_HEAD(&hsi->port[i].clients);
+		spin_lock_init(&hsi->port[i].clock);
+		err = device_register(&hsi->port[i].device);
+		if (err < 0)
+			goto out;
+	}
+	/* Populate HSI bus with HSI clients */
+	hsi_scan_board_info(hsi);
+
+	return 0;
+out:
+	hsi_unregister_controller(hsi);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(hsi_register_controller);
+
+/**
+ * hsi_register_client_driver - Register an HSI client to the HSI bus
+ * @drv: HSI client driver to register
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_register_client_driver(struct hsi_client_driver *drv)
+{
+	drv->driver.bus = &hsi_bus_type;
+
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(hsi_register_client_driver);
+
+static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused)
+{
+	return 0;
+}
+
+static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused)
+{
+	return 0;
+}
+
+/**
+ * hsi_alloc_controller - Allocate an HSI controller and its ports
+ * @n_ports: Number of ports on the HSI controller
+ * @flags: Kernel allocation flags
+ *
+ * Return NULL on failure or a pointer to an hsi_controller on success.
+ */
+struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
+{
+	struct hsi_controller	*hsi;
+	struct hsi_port		*port;
+	unsigned int		i;
+
+	if (!n_ports)
+		return NULL;
+
+	port = kzalloc(sizeof(*port)*n_ports, flags);
+	if (!port)
+		return NULL;
+	hsi = kzalloc(sizeof(*hsi), flags);
+	if (!hsi)
+		goto out;
+	for (i = 0; i < n_ports; i++) {
+		dev_set_name(&port[i].device, "port%d", i);
+		port[i].num = i;
+		port[i].async = hsi_dummy_msg;
+		port[i].setup = hsi_dummy_cl;
+		port[i].flush = hsi_dummy_cl;
+		port[i].start_tx = hsi_dummy_cl;
+		port[i].stop_tx = hsi_dummy_cl;
+		port[i].release = hsi_dummy_cl;
+		mutex_init(&port[i].lock);
+	}
+	hsi->num_ports = n_ports;
+	hsi->port = port;
+
+	return hsi;
+out:
+	kfree(port);
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(hsi_alloc_controller);
+
+/**
+ * hsi_free_controller - Free an HSI controller
+ * @hsi: Pointer to HSI controller
+ */
+void hsi_free_controller(struct hsi_controller *hsi)
+{
+	if (!hsi)
+		return;
+
+	kfree(hsi->port);
+	kfree(hsi);
+}
+EXPORT_SYMBOL_GPL(hsi_free_controller);
+
+/**
+ * hsi_free_msg - Free an HSI message
+ * @msg: Pointer to the HSI message
+ *
+ * Client is responsible to free the buffers pointed by the scatterlists.
+ */
+void hsi_free_msg(struct hsi_msg *msg)
+{
+	if (!msg)
+		return;
+	sg_free_table(&msg->sgt);
+	kfree(msg);
+}
+EXPORT_SYMBOL_GPL(hsi_free_msg);
+
+/**
+ * hsi_alloc_msg - Allocate an HSI message
+ * @nents: Number of memory entries
+ * @flags: Kernel allocation flags
+ *
+ * nents can be 0. This mainly makes sense for read transfer.
+ * In that case, HSI drivers will call the complete callback when
+ * there is data to be read without consuming it.
+ *
+ * Return NULL on failure or a pointer to an hsi_msg on success.
+ */
+struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags)
+{
+	struct hsi_msg *msg;
+	int err;
+
+	msg = kzalloc(sizeof(*msg), flags);
+	if (!msg)
+		return NULL;
+
+	if (!nents)
+		return msg;
+
+	err = sg_alloc_table(&msg->sgt, nents, flags);
+	if (unlikely(err)) {
+		kfree(msg);
+		msg = NULL;
+	}
+
+	return msg;
+}
+EXPORT_SYMBOL_GPL(hsi_alloc_msg);
+
+/**
+ * hsi_async - Submit an HSI transfer to the controller
+ * @cl: HSI client sending the transfer
+ * @msg: The HSI transfer passed to controller
+ *
+ * The HSI message must have the channel, ttype, complete and destructor
+ * fields set beforehand. If nents > 0 then the client has to initialize
+ * also the scatterlists to point to the buffers to write to or read from.
+ *
+ * HSI controllers relay on pre-allocated buffers from their clients and they
+ * do not allocate buffers on their own.
+ *
+ * Once the HSI message transfer finishes, the HSI controller calls the
+ * complete callback with the status and actual_len fields of the HSI message
+ * updated. The complete callback can be called before returning from
+ * hsi_async.
+ *
+ * Returns -errno on failure or 0 on success
+ */
+int hsi_async(struct hsi_client *cl, struct hsi_msg *msg)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+
+	if (!hsi_port_claimed(cl))
+		return -EACCES;
+
+	WARN_ON_ONCE(!msg->destructor || !msg->complete);
+	msg->cl = cl;
+
+	return port->async(msg);
+}
+EXPORT_SYMBOL_GPL(hsi_async);
+
+/**
+ * hsi_claim_port - Claim the HSI client's port
+ * @cl: HSI client that wants to claim its port
+ * @share: Flag to indicate if the client wants to share the port or not.
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_claim_port(struct hsi_client *cl, unsigned int share)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+	int err = 0;
+
+	mutex_lock(&port->lock);
+	if ((port->claimed) && (!port->shared || !share)) {
+		err = -EBUSY;
+		goto out;
+	}
+	if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) {
+		err = -ENODEV;
+		goto out;
+	}
+	port->claimed++;
+	port->shared = !!share;
+	cl->pclaimed = 1;
+out:
+	mutex_unlock(&port->lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(hsi_claim_port);
+
+/**
+ * hsi_release_port - Release the HSI client's port
+ * @cl: HSI client which previously claimed its port
+ */
+void hsi_release_port(struct hsi_client *cl)
+{
+	struct hsi_port *port = hsi_get_port(cl);
+
+	mutex_lock(&port->lock);
+	/* Allow HW driver to do some cleanup */
+	port->release(cl);
+	if (cl->pclaimed)
+		port->claimed--;
+	BUG_ON(port->claimed < 0);
+	cl->pclaimed = 0;
+	if (!port->claimed)
+		port->shared = 0;
+	module_put(to_hsi_controller(port->device.parent)->owner);
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL_GPL(hsi_release_port);
+
+static int hsi_start_rx(struct hsi_client *cl, void *data __maybe_unused)
+{
+	if (cl->hsi_start_rx)
+		(*cl->hsi_start_rx)(cl);
+
+	return 0;
+}
+
+static int hsi_stop_rx(struct hsi_client *cl, void *data __maybe_unused)
+{
+	if (cl->hsi_stop_rx)
+		(*cl->hsi_stop_rx)(cl);
+
+	return 0;
+}
+
+static int hsi_port_for_each_client(struct hsi_port *port, void *data,
+				int (*fn)(struct hsi_client *cl, void *data))
+{
+	struct hsi_client *cl;
+
+	spin_lock(&port->clock);
+	list_for_each_entry(cl, &port->clients, link) {
+		spin_unlock(&port->clock);
+		(*fn)(cl, data);
+		spin_lock(&port->clock);
+	}
+	spin_unlock(&port->clock);
+
+	return 0;
+}
+
+/**
+ * hsi_event -Notifies clients about port events
+ * @port: Port where the event occurred
+ * @event: The event type
+ *
+ * Clients should not be concerned about wake line behavior. However, due
+ * to a race condition in HSI HW protocol, clients need to be notified
+ * about wake line changes, so they can implement a workaround for it.
+ *
+ * Events:
+ * HSI_EVENT_START_RX - Incoming wake line high
+ * HSI_EVENT_STOP_RX - Incoming wake line down
+ */
+void hsi_event(struct hsi_port *port, unsigned int event)
+{
+	int (*fn)(struct hsi_client *cl, void *data);
+
+	switch (event) {
+	case HSI_EVENT_START_RX:
+		fn = hsi_start_rx;
+		break;
+	case HSI_EVENT_STOP_RX:
+		fn = hsi_stop_rx;
+		break;
+	default:
+		return;
+	}
+	hsi_port_for_each_client(port, NULL, fn);
+}
+EXPORT_SYMBOL_GPL(hsi_event);
+
+static int __init hsi_init(void)
+{
+	return bus_register(&hsi_bus_type);
+}
+postcore_initcall(hsi_init);
+
+static void __exit hsi_exit(void)
+{
+	bus_unregister(&hsi_bus_type);
+}
+module_exit(hsi_exit);
+
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
+MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hsi/hsi_boardinfo.c b/drivers/hsi/hsi_boardinfo.c
new file mode 100644
index 00000000000..3a9e4e86652
--- /dev/null
+++ b/drivers/hsi/hsi_boardinfo.c
@@ -0,0 +1,64 @@
+/*
+ * hsi_boardinfo.c
+ *
+ * HSI clients registration interface
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/hsi/hsi.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include "hsi_core.h"
+
+/*
+ * hsi_board_list is only used internally by the HSI framework.
+ * No one else is allowed to make use of it.
+ */
+LIST_HEAD(hsi_board_list);
+EXPORT_SYMBOL_GPL(hsi_board_list);
+
+/**
+ * hsi_register_board_info - Register HSI clients information
+ * @info: Array of HSI clients on the board
+ * @len: Length of the array
+ *
+ * HSI clients are statically declared and registered on board files.
+ *
+ * HSI clients will be automatically registered to the HSI bus once the
+ * controller and the port where the clients wishes to attach are registered
+ * to it.
+ *
+ * Return -errno on failure, 0 on success.
+ */
+int __init hsi_register_board_info(struct hsi_board_info const *info,
+							unsigned int len)
+{
+	struct hsi_cl_info *cl_info;
+
+	cl_info = kzalloc(sizeof(*cl_info) * len, GFP_KERNEL);
+	if (!cl_info)
+		return -ENOMEM;
+
+	for (; len; len--, info++, cl_info++) {
+		cl_info->info = *info;
+		list_add_tail(&cl_info->list, &hsi_board_list);
+	}
+
+	return 0;
+}
diff --git a/drivers/hsi/hsi_core.h b/drivers/hsi/hsi_core.h
new file mode 100644
index 00000000000..8005509a28b
--- /dev/null
+++ b/drivers/hsi/hsi_core.h
@@ -0,0 +1,37 @@
+/*
+ * hsi_core.h
+ *
+ * HSI framework internal interfaces,
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __LINUX_HSI_CORE_H__
+#define __LINUX_HSI_CORE_H__
+
+#include <linux/hsi/hsi.h>
+
+struct hsi_cl_info {
+	struct list_head	list;
+	struct hsi_board_info	info;
+};
+
+extern struct list_head hsi_board_list;
+
+#endif /* __LINUX_HSI_CORE_H__ */
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 02324b894e1..36c560e08b3 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -3,6 +3,7 @@ header-y += can/
 header-y += caif/
 header-y += dvb/
 header-y += hdlc/
+header-y += hsi/
 header-y += isdn/
 header-y += mmc/
 header-y += nfsd/
diff --git a/include/linux/hsi/Kbuild b/include/linux/hsi/Kbuild
new file mode 100644
index 00000000000..271a770b478
--- /dev/null
+++ b/include/linux/hsi/Kbuild
@@ -0,0 +1 @@
+header-y += hsi_char.h
diff --git a/include/linux/hsi/hsi.h b/include/linux/hsi/hsi.h
new file mode 100644
index 00000000000..455120c1fb3
--- /dev/null
+++ b/include/linux/hsi/hsi.h
@@ -0,0 +1,391 @@
+/*
+ * hsi.h
+ *
+ * HSI core header file.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __LINUX_HSI_H__
+#define __LINUX_HSI_H__
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/module.h>
+
+/* HSI message ttype */
+#define HSI_MSG_READ	0
+#define HSI_MSG_WRITE	1
+
+/* HSI configuration values */
+enum {
+	HSI_MODE_STREAM	= 1,
+	HSI_MODE_FRAME,
+};
+
+enum {
+	HSI_FLOW_SYNC,	/* Synchronized flow */
+	HSI_FLOW_PIPE,	/* Pipelined flow */
+};
+
+enum {
+	HSI_ARB_RR,	/* Round-robin arbitration */
+	HSI_ARB_PRIO,	/* Channel priority arbitration */
+};
+
+#define HSI_MAX_CHANNELS	16
+
+/* HSI message status codes */
+enum {
+	HSI_STATUS_COMPLETED,	/* Message transfer is completed */
+	HSI_STATUS_PENDING,	/* Message pending to be read/write (POLL) */
+	HSI_STATUS_PROCEEDING,	/* Message transfer is ongoing */
+	HSI_STATUS_QUEUED,	/* Message waiting to be served */
+	HSI_STATUS_ERROR,	/* Error when message transfer was ongoing */
+};
+
+/* HSI port event codes */
+enum {
+	HSI_EVENT_START_RX,
+	HSI_EVENT_STOP_RX,
+};
+
+/**
+ * struct hsi_config - Configuration for RX/TX HSI modules
+ * @mode: Bit transmission mode (STREAM or FRAME)
+ * @channels: Number of channels to use [1..16]
+ * @speed: Max bit transmission speed (Kbit/s)
+ * @flow: RX flow type (SYNCHRONIZED or PIPELINE)
+ * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
+ */
+struct hsi_config {
+	unsigned int	mode;
+	unsigned int	channels;
+	unsigned int	speed;
+	/* ch_prio for TX only, Valid if arb_mode == HSI_ARB_PRIO */
+	unsigned char	ch_prio[HSI_MAX_CHANNELS];
+	union {
+		unsigned int	flow;		/* RX only */
+		unsigned int	arb_mode;	/* TX only */
+	};
+};
+
+/**
+ * struct hsi_board_info - HSI client board info
+ * @name: Name for the HSI device
+ * @hsi_id: HSI controller id where the client sits
+ * @port: Port number in the controller where the client sits
+ * @tx_cfg: HSI TX configuration
+ * @rx_cfg: HSI RX configuration
+ * @platform_data: Platform related data
+ * @archdata: Architecture-dependent device data
+ */
+struct hsi_board_info {
+	const char		*name;
+	int			hsi_id;
+	unsigned int		port;
+	struct hsi_config	tx_cfg;
+	struct hsi_config	rx_cfg;
+	void			*platform_data;
+	struct dev_archdata	*archdata;
+};
+
+#ifdef CONFIG_HSI_BOARDINFO
+extern int hsi_register_board_info(struct hsi_board_info const *info,
+							unsigned int len);
+#else
+static inline int hsi_register_board_info(struct hsi_board_info const *info,
+							unsigned int len)
+{
+	return 0;
+}
+#endif /* CONFIG_HSI_BOARDINFO */
+
+/**
+ * struct hsi_client - HSI client attached to an HSI port
+ * @device: Driver model representation of the device
+ * @tx_cfg: HSI TX configuration
+ * @rx_cfg: HSI RX configuration
+ * @hsi_start_rx: Called after incoming wake line goes high
+ * @hsi_stop_rx: Called after incoming wake line goes low
+ */
+struct hsi_client {
+	struct device		device;
+	struct hsi_config	tx_cfg;
+	struct hsi_config	rx_cfg;
+	void			(*hsi_start_rx)(struct hsi_client *cl);
+	void			(*hsi_stop_rx)(struct hsi_client *cl);
+	/* private: */
+	unsigned int		pclaimed:1;
+	struct list_head	link;
+};
+
+#define to_hsi_client(dev) container_of(dev, struct hsi_client, device)
+
+static inline void hsi_client_set_drvdata(struct hsi_client *cl, void *data)
+{
+	dev_set_drvdata(&cl->device, data);
+}
+
+static inline void *hsi_client_drvdata(struct hsi_client *cl)
+{
+	return dev_get_drvdata(&cl->device);
+}
+
+/**
+ * struct hsi_client_driver - Driver associated to an HSI client
+ * @driver: Driver model representation of the driver
+ */
+struct hsi_client_driver {
+	struct device_driver	driver;
+};
+
+#define to_hsi_client_driver(drv) container_of(drv, struct hsi_client_driver,\
+									driver)
+
+int hsi_register_client_driver(struct hsi_client_driver *drv);
+
+static inline void hsi_unregister_client_driver(struct hsi_client_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+
+/**
+ * struct hsi_msg - HSI message descriptor
+ * @link: Free to use by the current descriptor owner
+ * @cl: HSI device client that issues the transfer
+ * @sgt: Head of the scatterlist array
+ * @context: Client context data associated to the transfer
+ * @complete: Transfer completion callback
+ * @destructor: Destructor to free resources when flushing
+ * @status: Status of the transfer when completed
+ * @actual_len: Actual length of data transfered on completion
+ * @channel: Channel were to TX/RX the message
+ * @ttype: Transfer type (TX if set, RX otherwise)
+ * @break_frame: if true HSI will send/receive a break frame (FRAME MODE)
+ */
+struct hsi_msg {
+	struct list_head	link;
+	struct hsi_client	*cl;
+	struct sg_table		sgt;
+	void			*context;
+
+	void			(*complete)(struct hsi_msg *msg);
+	void			(*destructor)(struct hsi_msg *msg);
+
+	int			status;
+	unsigned int		actual_len;
+	unsigned int		channel;
+	unsigned int		ttype:1;
+	unsigned int		break_frame:1;
+};
+
+struct hsi_msg *hsi_alloc_msg(unsigned int n_frag, gfp_t flags);
+void hsi_free_msg(struct hsi_msg *msg);
+
+/**
+ * struct hsi_port - HSI port device
+ * @device: Driver model representation of the device
+ * @tx_cfg: Current TX path configuration
+ * @rx_cfg: Current RX path configuration
+ * @num: Port number
+ * @shared: Set when port can be shared by different clients
+ * @claimed: Reference count of clients which claimed the port
+ * @lock: Serialize port claim
+ * @async: Asynchronous transfer callback
+ * @setup: Callback to set the HSI client configuration
+ * @flush: Callback to clean the HW state and destroy all pending transfers
+ * @start_tx: Callback to inform that a client wants to TX data
+ * @stop_tx: Callback to inform that a client no longer wishes to TX data
+ * @release: Callback to inform that a client no longer uses the port
+ * @clients: List of hsi_clients using the port.
+ * @clock: Lock to serialize access to the clients list.
+ */
+struct hsi_port {
+	struct device			device;
+	struct hsi_config		tx_cfg;
+	struct hsi_config		rx_cfg;
+	unsigned int			num;
+	unsigned int			shared:1;
+	int				claimed;
+	struct mutex			lock;
+	int				(*async)(struct hsi_msg *msg);
+	int				(*setup)(struct hsi_client *cl);
+	int				(*flush)(struct hsi_client *cl);
+	int				(*start_tx)(struct hsi_client *cl);
+	int				(*stop_tx)(struct hsi_client *cl);
+	int				(*release)(struct hsi_client *cl);
+	struct list_head		clients;
+	spinlock_t			clock;
+};
+
+#define to_hsi_port(dev) container_of(dev, struct hsi_port, device)
+#define hsi_get_port(cl) to_hsi_port((cl)->device.parent)
+
+void hsi_event(struct hsi_port *port, unsigned int event);
+int hsi_claim_port(struct hsi_client *cl, unsigned int share);
+void hsi_release_port(struct hsi_client *cl);
+
+static inline int hsi_port_claimed(struct hsi_client *cl)
+{
+	return cl->pclaimed;
+}
+
+static inline void hsi_port_set_drvdata(struct hsi_port *port, void *data)
+{
+	dev_set_drvdata(&port->device, data);
+}
+
+static inline void *hsi_port_drvdata(struct hsi_port *port)
+{
+	return dev_get_drvdata(&port->device);
+}
+
+/**
+ * struct hsi_controller - HSI controller device
+ * @device: Driver model representation of the device
+ * @owner: Pointer to the module owning the controller
+ * @id: HSI controller ID
+ * @num_ports: Number of ports in the HSI controller
+ * @port: Array of HSI ports
+ */
+struct hsi_controller {
+	struct device		device;
+	struct module		*owner;
+	int			id;
+	unsigned int		num_ports;
+	struct hsi_port		*port;
+};
+
+#define to_hsi_controller(dev) container_of(dev, struct hsi_controller, device)
+
+struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags);
+void hsi_free_controller(struct hsi_controller *hsi);
+int hsi_register_controller(struct hsi_controller *hsi);
+void hsi_unregister_controller(struct hsi_controller *hsi);
+
+static inline void hsi_controller_set_drvdata(struct hsi_controller *hsi,
+								void *data)
+{
+	dev_set_drvdata(&hsi->device, data);
+}
+
+static inline void *hsi_controller_drvdata(struct hsi_controller *hsi)
+{
+	return dev_get_drvdata(&hsi->device);
+}
+
+static inline struct hsi_port *hsi_find_port_num(struct hsi_controller *hsi,
+							unsigned int num)
+{
+	return (num < hsi->num_ports) ? &hsi->port[num] : NULL;
+}
+
+/*
+ * API for HSI clients
+ */
+int hsi_async(struct hsi_client *cl, struct hsi_msg *msg);
+
+/**
+ * hsi_setup - Configure the client's port
+ * @cl: Pointer to the HSI client
+ *
+ * When sharing ports, clients should either relay on a single
+ * client setup or have the same setup for all of them.
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_setup(struct hsi_client *cl)
+{
+	if (!hsi_port_claimed(cl))
+		return -EACCES;
+	return	hsi_get_port(cl)->setup(cl);
+}
+
+/**
+ * hsi_flush - Flush all pending transactions on the client's port
+ * @cl: Pointer to the HSI client
+ *
+ * This function will destroy all pending hsi_msg in the port and reset
+ * the HW port so it is ready to receive and transmit from a clean state.
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_flush(struct hsi_client *cl)
+{
+	if (!hsi_port_claimed(cl))
+		return -EACCES;
+	return hsi_get_port(cl)->flush(cl);
+}
+
+/**
+ * hsi_async_read - Submit a read transfer
+ * @cl: Pointer to the HSI client
+ * @msg: HSI message descriptor of the transfer
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_async_read(struct hsi_client *cl, struct hsi_msg *msg)
+{
+	msg->ttype = HSI_MSG_READ;
+	return hsi_async(cl, msg);
+}
+
+/**
+ * hsi_async_write - Submit a write transfer
+ * @cl: Pointer to the HSI client
+ * @msg: HSI message descriptor of the transfer
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_async_write(struct hsi_client *cl, struct hsi_msg *msg)
+{
+	msg->ttype = HSI_MSG_WRITE;
+	return hsi_async(cl, msg);
+}
+
+/**
+ * hsi_start_tx - Signal the port that the client wants to start a TX
+ * @cl: Pointer to the HSI client
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_start_tx(struct hsi_client *cl)
+{
+	if (!hsi_port_claimed(cl))
+		return -EACCES;
+	return hsi_get_port(cl)->start_tx(cl);
+}
+
+/**
+ * hsi_stop_tx - Signal the port that the client no longer wants to transmit
+ * @cl: Pointer to the HSI client
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_stop_tx(struct hsi_client *cl)
+{
+	if (!hsi_port_claimed(cl))
+		return -EACCES;
+	return hsi_get_port(cl)->stop_tx(cl);
+}
+#endif /* __LINUX_HSI_H__ */
diff --git a/include/linux/hsi/hsi_char.h b/include/linux/hsi/hsi_char.h
new file mode 100644
index 00000000000..4ffe33f7376
--- /dev/null
+++ b/include/linux/hsi/hsi_char.h
@@ -0,0 +1,66 @@
+/*
+ * hsi_char.h
+ *
+ * Part of the HSI character device driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Andras Domokos <andras.domokos at nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+#ifndef __HSI_CHAR_H
+#define __HSI_CHAR_H
+
+#define HSI_CHAR_MAGIC		'k'
+#define HSC_IOW(num, dtype)	_IOW(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IOR(num, dtype)	_IOR(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IOWR(num, dtype)	_IOWR(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IO(num)		_IO(HSI_CHAR_MAGIC, num)
+
+#define HSC_RESET		HSC_IO(16)
+#define HSC_SET_PM		HSC_IO(17)
+#define HSC_SEND_BREAK		HSC_IO(18)
+#define HSC_SET_RX		HSC_IOW(19, struct hsc_rx_config)
+#define HSC_GET_RX		HSC_IOW(20, struct hsc_rx_config)
+#define HSC_SET_TX		HSC_IOW(21, struct hsc_tx_config)
+#define HSC_GET_TX		HSC_IOW(22, struct hsc_tx_config)
+
+#define HSC_PM_DISABLE		0
+#define HSC_PM_ENABLE		1
+
+#define HSC_MODE_STREAM		1
+#define HSC_MODE_FRAME		2
+#define HSC_FLOW_SYNC		0
+#define HSC_ARB_RR		0
+#define HSC_ARB_PRIO		1
+
+struct hsc_rx_config {
+	uint32_t mode;
+	uint32_t flow;
+	uint32_t channels;
+};
+
+struct hsc_tx_config {
+	uint32_t mode;
+	uint32_t channels;
+	uint32_t speed;
+	uint32_t arb_mode;
+	uint32_t priority;
+};
+
+#endif /* __HSI_CHAR_H */