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-rw-r--r--drivers/clk/x86/Makefile2
-rw-r--r--drivers/clk/x86/clk-lpss.c99
-rw-r--r--drivers/clk/x86/clk-lpss.h36
-rw-r--r--drivers/clk/x86/clk-lpt.c86
4 files changed, 223 insertions, 0 deletions
diff --git a/drivers/clk/x86/Makefile b/drivers/clk/x86/Makefile
new file mode 100644
index 000000000000..f9ba4fab0ddc
--- /dev/null
+++ b/drivers/clk/x86/Makefile
@@ -0,0 +1,2 @@
+clk-x86-lpss-objs := clk-lpss.o clk-lpt.o
+obj-$(CONFIG_X86_INTEL_LPSS) += clk-x86-lpss.o
diff --git a/drivers/clk/x86/clk-lpss.c b/drivers/clk/x86/clk-lpss.c
new file mode 100644
index 000000000000..b5e229f3c3d9
--- /dev/null
+++ b/drivers/clk/x86/clk-lpss.c
@@ -0,0 +1,99 @@
+/*
+ * Intel Low Power Subsystem clocks.
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
+ * Heikki Krogerus <heikki.krogerus@linux.intel.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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+static int clk_lpss_is_mmio_resource(struct acpi_resource *res, void *data)
+{
+ struct resource r;
+ return !acpi_dev_resource_memory(res, &r);
+}
+
+static acpi_status clk_lpss_find_mmio(acpi_handle handle, u32 level,
+ void *data, void **retval)
+{
+ struct resource_list_entry *rentry;
+ struct list_head resource_list;
+ struct acpi_device *adev;
+ const char *uid = data;
+ int ret;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return AE_OK;
+
+ if (uid) {
+ if (!adev->pnp.unique_id)
+ return AE_OK;
+ if (strcmp(uid, adev->pnp.unique_id))
+ return AE_OK;
+ }
+
+ INIT_LIST_HEAD(&resource_list);
+ ret = acpi_dev_get_resources(adev, &resource_list,
+ clk_lpss_is_mmio_resource, NULL);
+ if (ret < 0)
+ return AE_NO_MEMORY;
+
+ list_for_each_entry(rentry, &resource_list, node)
+ if (resource_type(&rentry->res) == IORESOURCE_MEM) {
+ *(struct resource *)retval = rentry->res;
+ break;
+ }
+
+ acpi_dev_free_resource_list(&resource_list);
+ return AE_OK;
+}
+
+/**
+ * clk_register_lpss_gate - register LPSS clock gate
+ * @name: name of this clock gate
+ * @parent_name: parent clock name
+ * @hid: ACPI _HID of the device
+ * @uid: ACPI _UID of the device (optional)
+ * @offset: LPSS PRV_CLOCK_PARAMS offset
+ *
+ * Creates and registers LPSS clock gate.
+ */
+struct clk *clk_register_lpss_gate(const char *name, const char *parent_name,
+ const char *hid, const char *uid,
+ unsigned offset)
+{
+ struct resource res = { };
+ void __iomem *mmio_base;
+ acpi_status status;
+ struct clk *clk;
+
+ /*
+ * First try to look the device and its mmio resource from the
+ * ACPI namespace.
+ */
+ status = acpi_get_devices(hid, clk_lpss_find_mmio, (void *)uid,
+ (void **)&res);
+ if (ACPI_FAILURE(status) || !res.start)
+ return ERR_PTR(-ENODEV);
+
+ mmio_base = ioremap(res.start, resource_size(&res));
+ if (!mmio_base)
+ return ERR_PTR(-ENOMEM);
+
+ clk = clk_register_gate(NULL, name, parent_name, 0, mmio_base + offset,
+ 0, 0, NULL);
+ if (IS_ERR(clk))
+ iounmap(mmio_base);
+
+ return clk;
+}
diff --git a/drivers/clk/x86/clk-lpss.h b/drivers/clk/x86/clk-lpss.h
new file mode 100644
index 000000000000..e9460f442297
--- /dev/null
+++ b/drivers/clk/x86/clk-lpss.h
@@ -0,0 +1,36 @@
+/*
+ * Intel Low Power Subsystem clock.
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
+ * Heikki Krogerus <heikki.krogerus@linux.intel.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.
+ */
+
+#ifndef __CLK_LPSS_H
+#define __CLK_LPSS_H
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+
+#ifdef CONFIG_ACPI
+extern struct clk *clk_register_lpss_gate(const char *name,
+ const char *parent_name,
+ const char *hid, const char *uid,
+ unsigned offset);
+#else
+static inline struct clk *clk_register_lpss_gate(const char *name,
+ const char *parent_name,
+ const char *hid,
+ const char *uid,
+ unsigned offset)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
+#endif /* __CLK_LPSS_H */
diff --git a/drivers/clk/x86/clk-lpt.c b/drivers/clk/x86/clk-lpt.c
new file mode 100644
index 000000000000..81298aeef7e3
--- /dev/null
+++ b/drivers/clk/x86/clk-lpt.c
@@ -0,0 +1,86 @@
+/*
+ * Intel Lynxpoint LPSS clocks.
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
+ * Heikki Krogerus <heikki.krogerus@linux.intel.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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "clk-lpss.h"
+
+#define PRV_CLOCK_PARAMS 0x800
+
+static int lpt_clk_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+
+ /* LPSS free running clock */
+ clk = clk_register_fixed_rate(&pdev->dev, "lpss_clk", NULL, CLK_IS_ROOT,
+ 100000000);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ /* Shared DMA clock */
+ clk_register_clkdev(clk, "hclk", "INTL9C60.0.auto");
+
+ /* SPI clocks */
+ clk = clk_register_lpss_gate("spi0_clk", "lpss_clk", "INT33C0", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C0:00");
+
+ clk = clk_register_lpss_gate("spi1_clk", "lpss_clk", "INT33C1", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C1:00");
+
+ /* I2C clocks */
+ clk = clk_register_lpss_gate("i2c0_clk", "lpss_clk", "INT33C2", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C2:00");
+
+ clk = clk_register_lpss_gate("i2c1_clk", "lpss_clk", "INT33C3", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C3:00");
+
+ /* UART clocks */
+ clk = clk_register_lpss_gate("uart0_clk", "lpss_clk", "INT33C4", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C4:00");
+
+ clk = clk_register_lpss_gate("uart1_clk", "lpss_clk", "INT33C5", NULL,
+ PRV_CLOCK_PARAMS);
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, NULL, "INT33C5:00");
+
+ return 0;
+}
+
+static struct platform_driver lpt_clk_driver = {
+ .driver = {
+ .name = "clk-lpt",
+ .owner = THIS_MODULE,
+ },
+ .probe = lpt_clk_probe,
+};
+
+static int __init lpt_clk_init(void)
+{
+ return platform_driver_register(&lpt_clk_driver);
+}
+arch_initcall(lpt_clk_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 21:19:06 +0000