diff options
Diffstat (limited to 'drivers/modem/shrm')
| -rw-r--r-- | drivers/modem/shrm/Kconfig | 43 | ||||
| -rw-r--r-- | drivers/modem/shrm/Makefile | 11 | ||||
| -rw-r--r-- | drivers/modem/shrm/modem_shrm_driver.c | 670 | ||||
| -rw-r--r-- | drivers/modem/shrm/shrm_driver.c | 1439 | ||||
| -rw-r--r-- | drivers/modem/shrm/shrm_fifo.c | 837 | ||||
| -rw-r--r-- | drivers/modem/shrm/shrm_protocol.c | 1546 |
6 files changed, 4546 insertions, 0 deletions
diff --git a/drivers/modem/shrm/Kconfig b/drivers/modem/shrm/Kconfig new file mode 100644 index 00000000000..465c8bb10a1 --- /dev/null +++ b/drivers/modem/shrm/Kconfig @@ -0,0 +1,43 @@ +# +# SHM HW kernel configuration +# +config U8500_SHRM + bool "U8500 SHRM hardware driver" + depends on ARCH_U8500 && PHONET && MODEM_U8500 + default Y + ---help--- + If you say Y here, you will enable the STN8500 SHM hardware driver. + + If unsure, say N. +choice + prompt "Modem Image Version" + depends on U8500_SHRM + default SHRM_V1_UPDATES_VERSION + + config SHRM_V1_UPDATES_VERSION + depends on U8500_SHRM + bool "SHRM V1 UPDATES" + help + Modem Images with V1 Updates + +endchoice + +config U8500_SHRM_LOOP_BACK + bool "U8500 SHRM loopback" + depends on U8500_SHRM + default n + ---help--- + If you say Y here, you will enable the shm loopback + + If unsure, say N. + +config U8500_SHRM_MODEM_SILENT_RESET + bool "U8500 SHRM Modem Silent Reset" + depends on U8500_SHRM + default n + ---help--- + If you say Y here, you will enable the modem silent reset feature + + If unsure, say N. + + diff --git a/drivers/modem/shrm/Makefile b/drivers/modem/shrm/Makefile new file mode 100644 index 00000000000..8115c24920b --- /dev/null +++ b/drivers/modem/shrm/Makefile @@ -0,0 +1,11 @@ +# +# Makefile for SHRM drivers +# + +ifdef CONFIG_PHONET +u8500_shrm-objs := modem_shrm_driver.o shrm_fifo.o shrm_protocol.o +else +u8500_shrm-objs := shrm_driver.o shrm_fifo.o shrm_protocol.o +endif + +obj-$(CONFIG_U8500_SHRM) += u8500_shrm.o diff --git a/drivers/modem/shrm/modem_shrm_driver.c b/drivers/modem/shrm/modem_shrm_driver.c new file mode 100644 index 00000000000..f46b86bd22e --- /dev/null +++ b/drivers/modem/shrm/modem_shrm_driver.c @@ -0,0 +1,670 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Biju Das <biju.das@stericsson.com> for ST-Ericsson + * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com> for ST-Ericsson + * Author: Arun Murthy <arun.murthy@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/poll.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/uaccess.h> +#include <asm/atomic.h> +#include <linux/io.h> +#include <linux/skbuff.h> +#ifdef CONFIG_HIGH_RES_TIMERS +#include <linux/hrtimer.h> +static struct hrtimer timer; +#endif +#include <linux/if_ether.h> +#include <linux/netdevice.h> +#include <linux/phonet.h> +#include <linux/modem/shrm/shrm_driver.h> +#include <linux/modem/shrm/shrm_private.h> +#include <linux/modem/shrm/shrm_config.h> +#include <linux/modem/shrm/shrm_net.h> +#include <linux/modem/shrm/shrm.h> + +#include <mach/isa_ioctl.h> +/* debug functionality */ +#define ISA_DEBUG 0 + +#define PHONET_TASKLET +#define MAX_RCV_LEN 2048 + +static void do_phonet_rcv_tasklet(unsigned long unused); +struct tasklet_struct phonet_rcv_tasklet; + +/** + * audio_receive() - Receive audio channel completion callback + * @shrm: pointer to shrm device information structure + * @data: message pointer + * @n_bytes: message size + * @l2_header: L2 header/device ID 2->audio, 5->audio_loopback + * + * This fucntion is called from the audio receive handler. Copies the audio + * message from the FIFO to the AUDIO queue. The message is later copied from + * this queue to the user buffer through the char or net interface read + * operation. + */ +static int audio_receive(struct shrm_dev *shrm, void *data, + u32 n_bytes, u8 l2_header) +{ + u32 size = 0; + int ret = 0; + int idx; + u8 *psrc; + struct message_queue *q; + struct isadev_context *audiodev; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + idx = shrm_get_cdev_index(l2_header); + if (idx < 0) { + dev_err(shrm->dev, "failed to get index\n"); + return idx; + } + audiodev = &shrm->isa_context->isadev[idx]; + q = &audiodev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + ret = add_msg_to_queue(q, n_bytes); + spin_unlock(&q->update_lock); + if (ret < 0) + dev_err(shrm->dev, "Adding a msg to message queue failed"); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * common_receive() - Receive common channel completion callback + * @shrm: pointer to the shrm device information structure + * @data: message pointer + * @n_bytes: message size + * @l2_header: L2 header / device ID + * + * This function is called from the receive handler to copy the respective + * ISI, RPC, SECURITY message to its respective queue. The message is then + * copied from queue to the user buffer on char net interface read operation. + */ +static int common_receive(struct shrm_dev *shrm, void *data, + u32 n_bytes, u8 l2_header) +{ + u32 size = 0; + int ret = 0; + int idx; + u8 *psrc; + struct message_queue *q; + struct isadev_context *isa_dev; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + idx = shrm_get_cdev_index(l2_header); + if (idx < 0) { + dev_err(shrm->dev, "failed to get index\n"); + return idx; + } + isa_dev = &shrm->isa_context->isadev[idx]; + q = &isa_dev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + dev_dbg(shrm->dev, "Inside Loop Back\n"); + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + ret = add_msg_to_queue(q, n_bytes); + spin_unlock(&q->update_lock); + if (ret < 0) { + dev_err(shrm->dev, "Adding a msg to message queue failed"); + return ret; + } + + + if (l2_header == ISI_MESSAGING) { + if (shrm->netdev_flag_up) { + dev_dbg(shrm->dev, + "scheduling the phonet tasklet from %s!\n", + __func__); + tasklet_schedule(&phonet_rcv_tasklet); + } + dev_dbg(shrm->dev, + "Out of phonet tasklet %s!!!\n", __func__); + } + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * rx_common_l2msg_handler() - common channel receive handler + * @l2_header: L2 header + * @msg: pointer to the receive buffer + * @length: length of the msg to read + * @shrm: pointer to shrm device information structure + * + * This function is called to receive the message from CaMsgPendingNotification + * interrupt handler. + */ +static void rx_common_l2msg_handler(u8 l2_header, + void *msg, u32 length, + struct shrm_dev *shrm) +{ + int ret = 0; + dev_dbg(shrm->dev, "%s IN\n", __func__); + + ret = common_receive(shrm, msg, length, l2_header); + if (ret < 0) + dev_err(shrm->dev, + "common receive with l2 header %d failed\n", l2_header); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +/** + * rx_audio_l2msg_handler() - audio channel receive handler + * @l2_header: L2 header + * @msg: pointer to the receive buffer + * @length: length of the msg to read + * @shrm: pointer to shrm device information structure + * + * This function is called to receive the message from CaMsgPendingNotification + * interrupt handler. + */ +static void rx_audio_l2msg_handler(u8 l2_header, + void *msg, u32 length, + struct shrm_dev *shrm) +{ + int ret = 0; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + ret = audio_receive(shrm, msg, length, l2_header); + if (ret < 0) + dev_err(shrm->dev, "audio receive failed\n"); + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +static int __init shm_initialise_irq(struct shrm_dev *shrm) +{ + int err = 0; + + err = shrm_protocol_init(shrm, + rx_common_l2msg_handler, rx_audio_l2msg_handler); + if (err < 0) { + dev_err(shrm->dev, "SHM Protocol Init Failure\n"); + return err; + } + + err = request_irq(shrm->ca_wake_irq, + ca_wake_irq_handler, IRQF_TRIGGER_RISING, + "ca_wake-up", shrm); + if (err < 0) { + dev_err(shrm->dev, + "Unable to allocate shm tx interrupt line\n"); + free_irq(shrm->ca_wake_irq, shrm); + return err; + } + + err = request_irq(shrm->ac_read_notif_0_irq, + ac_read_notif_0_irq_handler, 0, + "ac_read_notif_0", shrm); + + if (err < 0) { + dev_err(shrm->dev, + "error ac_read_notif_0_irq interrupt line\n"); + goto irq_err1; + } + + err = request_irq(shrm->ac_read_notif_1_irq, + ac_read_notif_1_irq_handler, 0, + "ac_read_notif_1", shrm); + + if (err < 0) { + dev_err(shrm->dev, + "error ac_read_notif_1_irq interrupt line\n"); + goto irq_err2; + } + + err = request_irq(shrm->ca_msg_pending_notif_0_irq, + ca_msg_pending_notif_0_irq_handler, 0, + "ca_msg_pending_notif_0", shrm); + + if (err < 0) { + dev_err(shrm->dev, + "error ca_msg_pending_notif_0_irq line\n"); + goto irq_err3; + } + + err = request_irq(shrm->ca_msg_pending_notif_1_irq, + ca_msg_pending_notif_1_irq_handler, 0, + "ca_msg_pending_notif_1", shrm); + + if (err < 0) { + dev_err(shrm->dev, + "error ca_msg_pending_notif_1_irq interrupt line\n"); + goto irq_err4; + } + return err; +irq_err4: + free_irq(shrm->ca_msg_pending_notif_0_irq, shrm); +irq_err3: + free_irq(shrm->ac_read_notif_1_irq, shrm); +irq_err2: + free_irq(shrm->ac_read_notif_0_irq, shrm); +irq_err1: + free_irq(shrm->ca_wake_irq, shrm); + return err; +} + +static void free_shm_irq(struct shrm_dev *shrm) +{ + free_irq(shrm->ca_wake_irq, shrm); + free_irq(shrm->ac_read_notif_0_irq, shrm); + free_irq(shrm->ac_read_notif_1_irq, shrm); + free_irq(shrm->ca_msg_pending_notif_0_irq, shrm); + free_irq(shrm->ca_msg_pending_notif_1_irq, shrm); +} + + + +#ifdef CONFIG_HIGH_RES_TIMERS +static enum hrtimer_restart callback(struct hrtimer *timer) +{ + return HRTIMER_NORESTART; +} +#endif + +void do_phonet_rcv_tasklet(unsigned long unused) +{ + ssize_t ret; + struct shrm_dev *shrm = (struct shrm_dev *)unused; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + for (;;) { + ret = shrm_net_receive(shrm->ndev); + if (ret == 0) { + dev_dbg(shrm->dev, "len is zero, queue empty\n"); + break; + } + if (ret < 0) { + dev_err(shrm->dev, "len < 0 !!! error!!!\n"); + break; + } + } + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +static int shrm_probe(struct platform_device *pdev) +{ + int err = 0; + struct resource *res; + struct shrm_dev *shrm = NULL; + + shrm = kzalloc(sizeof(struct shrm_dev), GFP_KERNEL); + if (shrm == NULL) { + dev_err(&pdev->dev, + "Could not allocate memory for struct shm_dev\n"); + return -ENOMEM; + } + + shrm->dev = &pdev->dev; + shrm->modem = modem_get(shrm->dev, "u8500-shrm-modem"); + if (shrm->modem == NULL) { + dev_err(shrm->dev, " Could not retrieve the modem.\n"); + err = -ENODEV; + goto rollback_intr; + } + + /* initialise the SHM */ + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + dev_err(shrm->dev, + "Unable to map Ca Wake up interrupt\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_wake_irq = res->start; + res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + + if (!res) { + dev_err(shrm->dev, + "Unable to map APE_Read_notif_common IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ac_read_notif_0_irq = res->start; + res = platform_get_resource(pdev, IORESOURCE_IRQ, 2); + + if (!res) { + dev_err(shrm->dev, + "Unable to map APE_Read_notif_audio IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ac_read_notif_1_irq = res->start; + res = platform_get_resource(pdev, IORESOURCE_IRQ, 3); + + if (!res) { + dev_err(shrm->dev, + "Unable to map Cmt_msg_pending_notif_common IRQbase\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_msg_pending_notif_0_irq = res->start; + res = platform_get_resource(pdev, IORESOURCE_IRQ, 4); + + if (!res) { + dev_err(shrm->dev, + "Unable to map Cmt_msg_pending_notif_audio IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_msg_pending_notif_1_irq = res->start; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!res) { + dev_err(shrm->dev, + "Could not get SHM IO memory information\n"); + err = -ENODEV; + goto rollback_intr; + } + shrm->intr_base = (void __iomem *)ioremap_nocache(res->start, + res->end - res->start + 1); + if (!(shrm->intr_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ape_common_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_APE_COMMON_BASE; + shrm->ape_common_fifo_base = + (void __iomem *)ioremap_nocache( + U8500_SHM_FIFO_APE_COMMON_BASE, + SHM_FIFO_0_SIZE); + shrm->ape_common_fifo_size = (SHM_FIFO_0_SIZE)/4; + + if (!(shrm->ape_common_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ape_common_fifo_base; + } + shrm->cmt_common_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_CMT_COMMON_BASE; + shrm->cmt_common_fifo_base = + (void __iomem *)ioremap_nocache( + U8500_SHM_FIFO_CMT_COMMON_BASE, SHM_FIFO_0_SIZE); + shrm->cmt_common_fifo_size = (SHM_FIFO_0_SIZE)/4; + + if (!(shrm->cmt_common_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_cmt_common_fifo_base; + } + shrm->ape_audio_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_APE_AUDIO_BASE; + shrm->ape_audio_fifo_base = + (void __iomem *)ioremap_nocache(U8500_SHM_FIFO_APE_AUDIO_BASE, + SHM_FIFO_1_SIZE); + shrm->ape_audio_fifo_size = (SHM_FIFO_1_SIZE)/4; + + if (!(shrm->ape_audio_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ape_audio_fifo_base; + } + shrm->cmt_audio_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_CMT_AUDIO_BASE; + shrm->cmt_audio_fifo_base = + (void __iomem *)ioremap_nocache(U8500_SHM_FIFO_CMT_AUDIO_BASE, + SHM_FIFO_1_SIZE); + shrm->cmt_audio_fifo_size = (SHM_FIFO_1_SIZE)/4; + + if (!(shrm->cmt_audio_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_cmt_audio_fifo_base; + } + shrm->ac_common_shared_wptr = + (void __iomem *)ioremap(SHM_ACFIFO_0_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_common_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ac_common_shared_wptr; + } + shrm->ac_common_shared_rptr = + (void __iomem *)ioremap(SHM_ACFIFO_0_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_common_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ca_common_shared_wptr = + (void __iomem *)ioremap(SHM_CAFIFO_0_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_common_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ca_common_shared_rptr = + (void __iomem *)ioremap(SHM_CAFIFO_0_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_common_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ac_audio_shared_wptr = + (void __iomem *)ioremap(SHM_ACFIFO_1_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_audio_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ac_audio_shared_rptr = + (void __iomem *)ioremap(SHM_ACFIFO_1_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_audio_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ca_audio_shared_wptr = + (void __iomem *)ioremap(SHM_CAFIFO_1_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_audio_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + shrm->ca_audio_shared_rptr = + (void __iomem *)ioremap(SHM_CAFIFO_1_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_audio_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + if (isa_init(shrm) != 0) { + dev_err(shrm->dev, "Driver Initialization Error\n"); + err = -EBUSY; + } + /* install handlers and tasklets */ + if (shm_initialise_irq(shrm)) { + dev_err(shrm->dev, + "shm error in interrupt registration\n"); + goto rollback_irq; + } +#ifdef CONFIG_HIGH_RES_TIMERS + hrtimer_init(&timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + timer.function = callback; + hrtimer_start(&timer, ktime_set(0, 2*NSEC_PER_MSEC), HRTIMER_MODE_REL); +#endif + err = shrm_register_netdev(shrm); + if (err < 0) + goto rollback_irq; + + tasklet_init(&phonet_rcv_tasklet, do_phonet_rcv_tasklet, 0); + phonet_rcv_tasklet.data = (unsigned long)shrm; + + platform_set_drvdata(pdev, shrm); + + return err; +rollback_irq: + free_shm_irq(shrm); +rollback_map: + iounmap(shrm->ac_common_shared_wptr); + iounmap(shrm->ac_common_shared_rptr); + iounmap(shrm->ca_common_shared_wptr); + iounmap(shrm->ca_common_shared_rptr); + iounmap(shrm->ac_audio_shared_wptr); + iounmap(shrm->ac_audio_shared_rptr); + iounmap(shrm->ca_audio_shared_wptr); + iounmap(shrm->ca_audio_shared_rptr); +rollback_ac_common_shared_wptr: + iounmap(shrm->cmt_audio_fifo_base); +rollback_cmt_audio_fifo_base: + iounmap(shrm->ape_audio_fifo_base); +rollback_ape_audio_fifo_base: + iounmap(shrm->cmt_common_fifo_base); +rollback_cmt_common_fifo_base: + iounmap(shrm->ape_common_fifo_base); +rollback_ape_common_fifo_base: + iounmap(shrm->intr_base); +rollback_intr: + kfree(shrm); + return err; +} + +static int __exit shrm_remove(struct platform_device *pdev) +{ + struct shrm_dev *shrm = platform_get_drvdata(pdev); + + free_shm_irq(shrm); + iounmap(shrm->intr_base); + iounmap(shrm->ape_common_fifo_base); + iounmap(shrm->cmt_common_fifo_base); + iounmap(shrm->ape_audio_fifo_base); + iounmap(shrm->cmt_audio_fifo_base); + iounmap(shrm->ac_common_shared_wptr); + iounmap(shrm->ac_common_shared_rptr); + iounmap(shrm->ca_common_shared_wptr); + iounmap(shrm->ca_common_shared_rptr); + iounmap(shrm->ac_audio_shared_wptr); + iounmap(shrm->ac_audio_shared_rptr); + iounmap(shrm->ca_audio_shared_wptr); + iounmap(shrm->ca_audio_shared_rptr); + shrm_unregister_netdev(shrm); + isa_exit(shrm); + kfree(shrm); + + return 0; +} + +#ifdef CONFIG_PM +/** + * u8500_shrm_suspend() - This routine puts the SHRM in to sustend state. + * @dev: pointer to device structure. + * + * This routine checks the current ongoing communication with Modem by + * examining the ca_wake state and prevents suspend if modem communication + * is on-going. + * If ca_wake = 1 (high), modem comm. is on-going; don't suspend + * If ca_wake = 0 (low), no comm. with modem on-going.Allow suspend + */ +int u8500_shrm_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct shrm_dev *shrm = platform_get_drvdata(pdev); + int err; + + dev_dbg(&pdev->dev, "%s called...\n", __func__); + dev_dbg(&pdev->dev, "ca_wake_req_state = %x\n", + get_ca_wake_req_state()); + + /* if ca_wake_req is high, prevent system suspend */ + if (!get_ca_wake_req_state()) { + err = shrm_suspend_netdev(shrm->ndev); + return err; + } else + return -EBUSY; +} + +/** + * u8500_shrm_resume() - This routine resumes the SHRM from suspend state. + * @dev: pointer to device structure + * + * This routine restore back the current state of the SHRM + */ +int u8500_shrm_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct shrm_dev *shrm = platform_get_drvdata(pdev); + int err; + + dev_dbg(&pdev->dev, "%s called...\n", __func__); + err = shrm_resume_netdev(shrm->ndev); + + return err; +} + +static const struct dev_pm_ops shrm_dev_pm_ops = { + .suspend_noirq = u8500_shrm_suspend, + .resume_noirq = u8500_shrm_resume, +}; +#endif + +static struct platform_driver shrm_driver = { + .remove = __exit_p(shrm_remove), + .driver = { + .name = "u8500_shrm", + .owner = THIS_MODULE, +#ifdef CONFIG_PM + .pm = &shrm_dev_pm_ops, +#endif + }, +}; + +static int __init shrm_driver_init(void) +{ + return platform_driver_probe(&shrm_driver, shrm_probe); +} + +static void __exit shrm_driver_exit(void) +{ + platform_driver_unregister(&shrm_driver); +} + +module_init(shrm_driver_init); +module_exit(shrm_driver_exit); + +MODULE_AUTHOR("Biju Das, Kumar Sanghvi, Arun Murthy"); +MODULE_DESCRIPTION("Shared Memory Modem Driver Interface"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/modem/shrm/shrm_driver.c b/drivers/modem/shrm/shrm_driver.c new file mode 100644 index 00000000000..11540831f95 --- /dev/null +++ b/drivers/modem/shrm/shrm_driver.c @@ -0,0 +1,1439 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Biju Das <biju.das@stericsson.com> for ST-Ericsson + * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com> for ST-Ericsson + * Author: Arun Murthy <arun.murthy@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#define DEBUG + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/smp_lock.h> +#include <linux/poll.h> +#include <linux/mutex.h> +#include <linux/uaccess.h> +#include <asm/atomic.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/modem/shrm/shrm_driver.h> +#include <linux/modem/shrm/shrm_private.h> +#include <linux/modem/shrm/shrm_config.h> +#include <linux/modem/shrm/shrm.h> + +#include <mach/isa_ioctl.h> + + +#ifdef CONFIG_HIGH_RES_TIMERS +#include <linux/hrtimer.h> +static struct hrtimer timer; +#endif + + +#define NAME "IPC_ISA" +#define ISA_DEVICES 4 +/**debug functionality*/ +#define ISA_DEBUG 0 + +#define ISI_MESSAGING (0) +#define RPC_MESSAGING (1) +#define AUDIO_MESSAGING (2) +#define SECURITY_MESSAGING (3) + +#define SIZE_OF_FIFO (512*1024) + +static u8 message_fifo[4][SIZE_OF_FIFO]; + +static u8 wr_isi_msg[10*1024]; +static u8 wr_rpc_msg[10*1024]; +static u8 wr_sec_msg[10*1024]; +static u8 wr_audio_msg[10*1024]; + +/* global data */ +/* + * int major:This variable is exported to user as module_param to specify + * major number at load time + */ +static int major; +module_param(major, int, 0); +MODULE_PARM_DESC(major, "Major device number"); +/* global fops mutex */ +static DEFINE_MUTEX(isa_lock); +rx_cb common_rx; +rx_cb audio_rx; + + +static int isi_receive(struct shrm_dev *shrm, void *data, u32 n_bytes); +static int rpc_receive(struct shrm_dev *shrm, void *data, u32 n_bytes); +static int audio_receive(struct shrm_dev *shrm, void *data, u32 n_bytes); +static int security_receive(struct shrm_dev *shrm, + void *data, u32 n_bytes); + +static void rx_common_l2msg_handler(u8 l2_header, + void *msg, u32 length, + struct shrm_dev *shrm) +{ + int ret = 0; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + u8 *pdata; +#endif + dev_dbg(shrm->dev, "%s IN\n", __func__); + + switch (l2_header) { + case ISI_MESSAGING: + ret = isi_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, "isi receive failed\n"); + break; + case RPC_MESSAGING: + ret = rpc_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, "rpc receive failed\n"); + break; + case SECURITY_MESSAGING: + ret = security_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, + "security receive failed\n"); + break; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + case COMMMON_LOOPBACK_MESSAGING: + pdata = (u8 *)msg; + if ((*pdata == 0x50) || (*pdata == 0xAF)) { + ret = isi_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, "isi receive failed\n"); + } else if ((*pdata == 0x0A) || (*pdata == 0xF5)) { + ret = rpc_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, "rpc receive failed\n"); + } else if ((*pdata == 0xFF) || (*pdata == 0x00)) { + ret = security_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, + "security receive failed\n"); + } + break; +#endif + default: + break; + } + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +static void rx_audio_l2msg_handler(u8 l2_header, + void *msg, u32 length, + struct shrm_dev *shrm) +{ + int ret = 0; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + audio_receive(shrm, msg, length); + if (ret < 0) + dev_err(shrm->dev, "audio receive failed\n"); + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +static int __init shm_initialise_irq(struct shrm_dev *shrm) +{ + int err = 0; + + shrm_protocol_init(shrm, + rx_common_l2msg_handler, rx_audio_l2msg_handler); + + err = request_irq(shrm->ca_wake_irq, + ca_wake_irq_handler, IRQF_TRIGGER_RISING, + "ca_wake-up", shrm); + if (err < 0) { + dev_err(shrm->dev, + "Unable to allocate shm tx interrupt line\n"); + return err; + } + + err = request_irq(shrm->ac_read_notif_0_irq, + ac_read_notif_0_irq_handler, 0, + "ac_read_notif_0", shrm); + if (err < 0) { + dev_err(shrm->dev, + "error ac_read_notif_0_irq interrupt line\n"); + goto irq_err1; + } + + err = request_irq(shrm->ac_read_notif_1_irq, + ac_read_notif_1_irq_handler, 0, + "ac_read_notif_1", shrm); + if (err < 0) { + dev_err(shrm->dev, + "error ac_read_notif_1_irq interrupt line\n"); + goto irq_err2; + } + + err = request_irq(shrm->ca_msg_pending_notif_0_irq, + ca_msg_pending_notif_0_irq_handler, 0, + "ca_msg_pending_notif_0", shrm); + if (err < 0) { + dev_err(shrm->dev, + "error ca_msg_pending_notif_0_irq line\n"); + goto irq_err3; + } + + err = request_irq(shrm->ca_msg_pending_notif_1_irq, + ca_msg_pending_notif_1_irq_handler, 0, + "ca_msg_pending_notif_1", shrm); + if (err < 0) { + dev_err(shrm->dev, + "error ca_msg_pending_notif_1_irq interrupt line\n"); + goto irq_err4; + } + + return err; + +irq_err4: + free_irq(shrm->ca_msg_pending_notif_0_irq, shrm); +irq_err3: + free_irq(shrm->ac_read_notif_1_irq, shrm); +irq_err2: + free_irq(shrm->ac_read_notif_0_irq, shrm); +irq_err1: + free_irq(shrm->ca_wake_irq, shrm); + return err; +} + +static void free_shm_irq(struct shrm_dev *shrm) +{ + free_irq(shrm->ca_wake_irq, shrm); + free_irq(shrm->ac_read_notif_0_irq, shrm); + free_irq(shrm->ac_read_notif_1_irq, shrm); + free_irq(shrm->ca_msg_pending_notif_0_irq, shrm); + free_irq(shrm->ca_msg_pending_notif_1_irq, shrm); +} + +/** + * create_queue() - To create FIFO for Tx and Rx message buffering. + * @q: message queue. + * @devicetype: device type 0-isi,1-rpc,2-audio,3-security. + * + * This function creates a FIFO buffer of n_bytes size using + * dma_alloc_coherent(). It also initializes all queue handling + * locks, queue management pointers. It also initializes message list + * which occupies this queue. + * + * It return -ENOMEM in case of no memory. + */ +static int create_queue(struct message_queue *q, u32 devicetype, + struct shrm_dev *shrm) +{ + q->fifo_base = (u8 *)&message_fifo[devicetype]; + q->size = SIZE_OF_FIFO; + q->readptr = 0; + q->writeptr = 0; + q->no = 0; + q->shrm = shrm; + spin_lock_init(&q->update_lock); + INIT_LIST_HEAD(&q->msg_list); + init_waitqueue_head(&q->wq_readable); + atomic_set(&q->q_rp, 0); + + return 0; +} +/** + * delete_queue() - To delete FIFO and assiciated memory. + * @q: message queue + * + * This function deletes FIFO created using create_queue() function. + * It resets queue management pointers. + */ +static void delete_queue(struct message_queue *q) +{ + q->size = 0; + q->readptr = 0; + q->writeptr = 0; +} + +/** + * add_msg_to_queue() - Add a message inside inside queue + * + * @q: message queue + * @size: size in bytes + * + * This function tries to allocate n_bytes of size in FIFO q. + * It returns negative number when no memory can be allocated + * currently. + */ +int add_msg_to_queue(struct message_queue *q, u32 size) +{ + struct queue_element *new_msg = NULL; + struct shrm_dev *shrm = q->shrm; + + dev_dbg(shrm->dev, "%s IN q->writeptr=%d\n", + __func__, q->writeptr); + new_msg = kmalloc(sizeof(struct queue_element), + GFP_KERNEL|GFP_ATOMIC); + + if (new_msg == NULL) { + dev_err(shrm->dev, "memory overflow inside while(1)\n"); + return -ENOMEM; + } + new_msg->offset = q->writeptr; + new_msg->size = size; + new_msg->no = q->no++; + + /* check for overflow condition */ + if (q->readptr <= q->writeptr) { + if (((q->writeptr-q->readptr) + size) >= q->size) { + dev_err(shrm->dev, "Buffer overflow !!\n"); + BUG_ON(((q->writeptr-q->readptr) + size) >= q->size); + } + } else { + if ((q->writeptr + size) >= q->readptr) { + dev_err(shrm->dev, "Buffer overflow !!\n"); + BUG_ON((q->writeptr + size) >= q->readptr); + } + } + q->writeptr = (q->writeptr + size) % q->size; + if (list_empty(&q->msg_list)) { + list_add_tail(&new_msg->entry, &q->msg_list); + /* There can be 2 blocking calls read and another select */ + + atomic_set(&q->q_rp, 1); + wake_up_interruptible(&q->wq_readable); + } else + list_add_tail(&new_msg->entry, &q->msg_list); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return 0; +} + +/** + * remove_msg_from_queue() - To remove a message from the msg queue. + * + * @q: message queue + * + * This function delets a message from the message list associated with message + * queue q and also updates read ptr. + * If the message list is empty, then, event is set to block the select and + * read calls of the paricular queue. + * + * The message list is FIFO style and message is always added to tail and + * removed from head. + */ + +int remove_msg_from_queue(struct message_queue *q) +{ + struct queue_element *old_msg = NULL; + struct shrm_dev *shrm = q->shrm; + struct list_head *msg; + + dev_dbg(shrm->dev, "%s IN q->readptr %d\n", + __func__, q->readptr); + + list_for_each(msg, &q->msg_list) { + old_msg = list_entry(msg, struct queue_element, entry); + if (old_msg == NULL) { + dev_err(shrm->dev, ":no message found\n"); + return -EFAULT; + } + break; + } + list_del(msg); + q->readptr = (q->readptr + old_msg->size) % q->size; + if (list_empty(&q->msg_list)) { + dev_dbg(shrm->dev, "List is empty setting RP= 0\n"); + atomic_set(&q->q_rp, 0); + } + kfree(old_msg); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return 0; +} + +/** + * get_size_of_new_msg() - retrieve new message from message list + * + * @q: message queue + * + * This function will retrieve most recent message from the corresponding + * queue list. New message is always retrieved from head side. + * It returns new message no, offset if FIFO and size. + */ +int get_size_of_new_msg(struct message_queue *q) +{ + struct queue_element *new_msg = NULL; + struct list_head *msg_list; + struct shrm_dev *shrm = q->shrm; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + spin_lock_bh(&q->update_lock); + list_for_each(msg_list, &q->msg_list) { + new_msg = list_entry(msg_list, struct queue_element, entry); + if (new_msg == NULL) { + spin_unlock_bh(&q->update_lock); + dev_err(shrm->dev, "no message found\n"); + return -1; + } + break; + } + spin_unlock_bh(&q->update_lock); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return new_msg->size; +} + +/** + * isi_receive() - Rx Completion callback + * + * @data:message pointer + * @n_bytes:message size + * + * This function is a callback to indicate ISI message reception is complete. + * It updates Writeptr of the Fifo + */ +static int isi_receive(struct shrm_dev *shrm, + void *data, u32 n_bytes) +{ + u32 size = 0; + int ret = 0; + u8 *psrc; + struct message_queue *q; + struct isadev_context *isidev = &shrm->isa_context->isadev[0]; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + q = &isidev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + dev_dbg(shrm->dev, "Inside Loop Back\n"); + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + ret = add_msg_to_queue(q, n_bytes); + if (ret < 0) + dev_err(shrm->dev, "Adding msg to message queue failed\n"); + spin_unlock(&q->update_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * rpc_receive() - Rx Completion callback + * + * @data:message pointer + * @n_bytes:message size + * + * This function is a callback to indicate RPC message reception is complete. + * It updates Writeptr of the Fifo + */ +static int rpc_receive(struct shrm_dev *shrm, + void *data, u32 n_bytes) +{ + u32 size = 0; + int ret = 0; + u8 *psrc; + struct message_queue *q; + struct isadev_context *rpcdev = &shrm->isa_context->isadev[1]; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + q = &rpcdev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + + ret = add_msg_to_queue(q, n_bytes); + if (ret < 0) + dev_err(shrm->dev, "Adding msg to message queue failed\n"); + spin_unlock(&q->update_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * audio_receive() - Rx Completion callback + * + * @data:message pointer + * @n_bytes:message size + * + * This function is a callback to indicate audio message reception is complete. + * It updates Writeptr of the Fifo + */ +static int audio_receive(struct shrm_dev *shrm, + void *data, u32 n_bytes) +{ + u32 size = 0; + int ret = 0; + u8 *psrc; + struct message_queue *q; + struct isadev_context *audiodev = &shrm->isa_context->isadev[2]; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + q = &audiodev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + ret = add_msg_to_queue(q, n_bytes); + if (ret < 0) + dev_err(shrm->dev, "Adding msg to message queue failed\n"); + spin_unlock(&q->update_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * security_receive() - Rx Completion callback + * + * @data:message pointer + * @n_bytes: message size + * + * This function is a callback to indicate security message reception + * is complete.It updates Writeptr of the Fifo + */ +static int security_receive(struct shrm_dev *shrm, + void *data, u32 n_bytes) +{ + u32 size = 0; + int ret = 0; + u8 *psrc; + struct message_queue *q; + struct isadev_context *secdev = &shrm->isa_context->isadev[3]; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + q = &secdev->dl_queue; + spin_lock(&q->update_lock); + /* Memcopy RX data first */ + if ((q->writeptr+n_bytes) >= q->size) { + psrc = (u8 *)data; + size = (q->size-q->writeptr); + /* Copy First Part of msg */ + memcpy((q->fifo_base+q->writeptr), psrc, size); + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + memcpy(q->fifo_base, psrc, (n_bytes-size)); + } else { + memcpy((q->fifo_base+q->writeptr), data, n_bytes); + } + ret = add_msg_to_queue(q, n_bytes); + if (ret < 0) + dev_err(shrm->dev, "Adding msg to message queue failed\n"); + spin_unlock(&q->update_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + + +/** + * isa_select() - Select Interface + * + * @filp:file descriptor pointer + * @wait:poll_table_struct pointer + * + * This function is used to perform non-blocking read operations. It allows + * a process to determine whether it can read from one or more open files + * without blocking. These calls can also block a process until any of a + * given set of file descriptors becomes available for reading. + * If a file is ready to read, POLLIN | POLLRDNORM bitmask is returned. + * The driver method is called whenever the user-space program performs a select + * system call involving a file descriptor associated with the driver. + */ +static u32 isa_select(struct file *filp, + struct poll_table_struct *wait) +{ + struct isadev_context *isadev = filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + struct message_queue *q; + u32 mask = 0; + u32 m = iminor(filp->f_path.dentry->d_inode); + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (isadev->device_id != m) + return -1; + q = &isadev->dl_queue; + poll_wait(filp, &q->wq_readable, wait); + if (atomic_read(&q->q_rp) == 1) + mask = POLLIN | POLLRDNORM; + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return mask; +} + +/** + * isa_read() - Read from device + * + * @filp:file descriptor + * @buf:user buffer pointer + * @len:size of requested data transfer + * @ppos:not used + * + * This function is called whenever user calls read() system call. + * It reads a oldest message from queue and copies it into user buffer and + * returns its size. + * If there is no message present in queue, then it blocks until new data is + * available. + */ +ssize_t isa_read(struct file *filp, char __user *buf, + size_t len, loff_t *ppos) +{ + struct isadev_context *isadev = (struct isadev_context *) + filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + struct message_queue *q; + char *psrc; + u32 msgsize; + u32 size = 0; + int ret = 0; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (len <= 0) + return -EFAULT; + q = &isadev->dl_queue; + + spin_lock_bh(&q->update_lock); + if (list_empty(&q->msg_list)) { + spin_unlock_bh(&q->update_lock); + if (wait_event_interruptible(q->wq_readable, + atomic_read(&q->q_rp) == 1)) { + return -ERESTARTSYS; + } + } else + spin_unlock_bh(&q->update_lock); + + msgsize = get_size_of_new_msg(q); + if ((q->readptr+msgsize) >= q->size) { + dev_dbg(shrm->dev, "Inside Loop Back\n"); + psrc = (char *)buf; + size = (q->size-q->readptr); + /* Copy First Part of msg */ + if (copy_to_user(psrc, + (u8 *)(q->fifo_base+q->readptr), + size)) { + dev_err(shrm->dev, "copy_to_user failed\n"); + return -EFAULT; + } + psrc += size; + /* Copy Second Part of msg at the top of fifo */ + if (copy_to_user(psrc, + (u8 *)(q->fifo_base), + (msgsize-size))) { + dev_err(shrm->dev, "copy_to_user failed\n"); + return -EFAULT; + } + } else { + if (copy_to_user(buf, + (u8 *)(q->fifo_base+q->readptr), + msgsize)) { + dev_err(shrm->dev, "copy_to_user failed\n"); + return -EFAULT; + } + } + + spin_lock_bh(&q->update_lock); + ret = remove_msg_from_queue(q); + if (ret < 0) { + dev_err(shrm->dev, + "Removing msg from message queue failed\n"); + msgsize = ret; + } + spin_unlock_bh(&q->update_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return msgsize; +} +/** + * isa_write() - Write to device + * + * @filp:file descriptor + * @buf:user buffer pointer + * @len:size of requested data transfer + * @ppos:not used + * + * This function is called whenever user calls write() system call. + * It checks if there is space available in queue, and copies the message + * inside queue. If there is no space, it blocks until space becomes available. + * It also schedules transfer thread to transmit the newly added message. + */ +static ssize_t isa_write(struct file *filp, const char __user *buf, + size_t len, loff_t *ppos) +{ + struct isadev_context *isadev = filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + struct message_queue *q; + int err, ret; + void *addr = 0; + u8 l2_header = 0; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + if (len <= 0) + return -EFAULT; + q = &isadev->dl_queue; + + switch (isadev->device_id) { + case ISI_MESSAGING: + dev_dbg(shrm->dev, "ISI\n"); + addr = (void *)wr_isi_msg; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + dev_dbg(shrm->dev, "Loopback\n"); + l2_header = COMMON_LOOPBACK_MESSAGING; +#else + l2_header = isadev->device_id; +#endif + break; + case RPC_MESSAGING: + dev_dbg(shrm->dev, "RPC\n"); + addr = (void *)wr_rpc_msg; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + l2_header = COMMON_LOOPBACK_MESSAGING; +#else + l2_header = isadev->device_id; +#endif + break; + case AUDIO_MESSAGING: + dev_dbg(shrm->dev, "Audio\n"); + addr = (void *)wr_audio_msg; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + l2_header = AUDIO_LOOPBACK_MESSAGING; +#else + l2_header = isadev->device_id; +#endif + + break; + case SECURITY_MESSAGING: + dev_dbg(shrm->dev, "Security\n"); + addr = (void *)wr_sec_msg; +#ifdef CONFIG_U8500_SHRM_LOOP_BACK + l2_header = COMMON_LOOPBACK_MESSAGING; +#else + l2_header = isadev->device_id; +#endif + break; + default: + dev_dbg(shrm->dev, "Wrong device\n"); + return -EFAULT; + } + + if (copy_from_user(addr, buf, len)) { + dev_err(shrm->dev, "copy_from_user failed\n"); + return -EFAULT; + } + + /* Write msg to Fifo */ + if (isadev->device_id == 2) { + mutex_lock(&shrm->isa_context->tx_audio_mutex); + err = shm_write_msg(shrm, l2_header, addr, len); + if (!err) + ret = len; + else + ret = err; + mutex_unlock(&shrm->isa_context->tx_audio_mutex); + } else { + spin_lock_bh(&shrm->isa_context->common_tx); + err = shm_write_msg(shrm, l2_header, addr, len); + if (!err) + ret = len; + else + ret = err; + spin_unlock_bh(&shrm->isa_context->common_tx); + } + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return ret; +} + +/** + * isa_ioctl() - To handle different ioctl commands supported by driver. + * + * @inode: structure is used by the kernel internally to represent files + * @filp:file descriptor pointer + * @cmd:ioctl command + * @arg:input param + * + * Following ioctls are supported by this driver. + * DLP_IOCTL_ALLOCATE_BUFFER - To allocate buffer for new uplink message. + * This ioctl is called with required message size. It returns offset for + * the allocates space in the queue. DLP_IOCTL_PUT_MESSAGE - To indicate + * new uplink message available in queuq for transmission. Message is copied + * from offset location returned by previous ioctl before calling this ioctl. + * DLP_IOCTL_GET_MESSAGE - To check if any downlink message is available in + * queue. It returns offset for new message inside queue. + * DLP_IOCTL_DEALLOCATE_BUFFER - To deallocate any buffer allocate for + * downlink message once the message is copied. Message is copied from offset + * location returned by previous ioctl before calling this ioctl. + */ +static int isa_ioctl(struct inode *inode, struct file *filp, + unsigned cmd, unsigned long arg) +{ + int err = 0; + struct isadev_context *isadev = filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + u32 m = iminor(inode); + + if (isadev->device_id != m) + return -1; + + switch (cmd) { + case DLP_IOC_ALLOCATE_BUFFER: + dev_dbg(shrm->dev, "DLP_IOC_ALLOCATE_BUFFER\n"); + break; + case DLP_IOC_PUT_MESSAGE: + dev_dbg(shrm->dev, "DLP_IOC_PUT_MESSAGE\n"); + break; + case DLP_IOC_GET_MESSAGE: + dev_dbg(shrm->dev, "DLP_IOC_GET_MESSAGE\n"); + break; + case DLP_IOC_DEALLOCATE_BUFFER: + dev_dbg(shrm->dev, "DLP_IOC_DEALLOCATE_BUFFER\n"); + break; + default: + dev_dbg(shrm->dev, "Unknown IOCTL\n"); + err = -1; + break; + } + return err; +} +/** + * isa_mmap() - Maps kernel queue memory to user space. + * + * @filp:file descriptor pointer + * @vma:virtual area memory structure. + * + * This function maps kernel FIFO into user space. This function + * shall be called twice to map both uplink and downlink buffers. + */ +static int isa_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct isadev_context *isadev = filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + + u32 m = iminor(filp->f_path.dentry->d_inode); + dev_dbg(shrm->dev, "%s %dIN\n", __func__, m); + + isadev = (struct isadev_context *)filp->private_data; + return 0; +} + +/** + * isa_close() - Close device file + * + * @inode:structure is used by the kernel internally to represent files + * @filp:device file descriptor + * + * This function deletes structues associated with this file, deletes + * queues, flushes and destroys workqueus and closes this file. + * It also unregisters itself from l2mux driver. + */ +static int isa_close(struct inode *inode, struct file *filp) +{ + struct isadev_context *isadev = filp->private_data; + struct shrm_dev *shrm = isadev->dl_queue.shrm; + struct isa_driver_context *isa_context = shrm->isa_context; + u8 m; + + mutex_lock(&isa_lock); + m = iminor(filp->f_path.dentry->d_inode); + dev_dbg(shrm->dev, "%s IN %d", __func__, m); + + if (atomic_dec_and_test(&isa_context->is_open[m])) { + atomic_inc(&isa_context->is_open[m]); + dev_err(shrm->dev, "Device not opened yet\n"); + mutex_unlock(&isa_lock); + return -ENODEV; + } + atomic_set(&isa_context->is_open[m], 1); + + dev_dbg(shrm->dev, "isadev->device_id %d", isadev->device_id); + dev_dbg(shrm->dev, "Closed %d device\n", m); + + if (m == ISI_MESSAGING) + dev_dbg(shrm->dev, "Closed ISI_MESSAGING Device\n"); + else if (m == RPC_MESSAGING) + dev_dbg(shrm->dev, "Closed RPC_MESSAGING Device\n"); + else if (m == AUDIO_MESSAGING) + dev_dbg(shrm->dev, "Closed AUDIO_MESSAGING Device\n"); + else if (m == SECURITY_MESSAGING) + dev_dbg(shrm->dev, "Closed SECURITY_MESSAGING Device\n"); + else + dev_dbg(shrm->dev, NAME ":No such device present\n"); + + mutex_unlock(&isa_lock); + return 0; +} +/** + * isa_open() - Open device file + * + * @inode: structure is used by the kernel internally to represent files + * @filp: device file descriptor + * + * This function performs initialization tasks needed to open SHM channel. + * Following tasks are performed. + * -return if device is already opened + * -create uplink FIFO + * -create downlink FIFO + * -init delayed workqueue thread + * -register to l2mux driver + */ +static int isa_open(struct inode *inode, struct file *filp) +{ + int err = 0; + u8 m; + struct isadev_context *isadev; + struct isa_driver_context *isa_context = container_of( + inode->i_cdev, + struct isa_driver_context, + cdev); + struct shrm_dev *shrm = isa_context->isadev->dl_queue.shrm; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (get_boot_state() != BOOT_DONE) { + dev_err(shrm->dev, "Boot is not done\n"); + return -EBUSY; + } + mutex_lock(&isa_lock); + m = iminor(inode); + + if ((m != ISI_MESSAGING) && (m != RPC_MESSAGING) && + (m != AUDIO_MESSAGING) && (m != SECURITY_MESSAGING)) { + dev_err(shrm->dev, "No such device present\n"); + mutex_unlock(&isa_lock); + return -ENODEV; + } + if (!atomic_dec_and_test(&isa_context->is_open[m])) { + atomic_inc(&isa_context->is_open[m]); + dev_err(shrm->dev, "Device already opened\n"); + mutex_unlock(&isa_lock); + return -EBUSY; + } + + if (m == ISI_MESSAGING) + dev_dbg(shrm->dev, "Open ISI_MESSAGING Device\n"); + else if (m == RPC_MESSAGING) + dev_dbg(shrm->dev, "Open RPC_MESSAGING Device\n"); + else if (m == AUDIO_MESSAGING) + dev_dbg(shrm->dev, "Open AUDIO_MESSAGING Device\n"); + else if (m == SECURITY_MESSAGING) + dev_dbg(shrm->dev, "Open SECURITY_MESSAGING Device\n"); + else + dev_dbg(shrm->dev, ":No such device present\n"); + + isadev = &isa_context->isadev[m]; + if (filp != NULL) + filp->private_data = isadev; + + mutex_unlock(&isa_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return err; +} + +const struct file_operations isa_fops = { + .owner = THIS_MODULE, + .open = isa_open, + .release = isa_close, + .ioctl = isa_ioctl, + .mmap = isa_mmap, + .read = isa_read, + .write = isa_write, + .poll = isa_select, +}; + +/** + * isa_init() - module insertion function + * + * This function registers module as a character driver using + * register_chrdev_region() or alloc_chrdev_region. It adds this + * driver to system using cdev_add() call. Major number is dynamically + * allocated using alloc_chrdev_region() by default or left to user to specify + * it during load time. For this variable major is used as module_param + * Nodes to be created using + * mknod /dev/isi c $major 0 + * mknod /dev/rpc c $major 1 + * mknod /dev/audio c $major 2 + * mknod /dev/sec c $major 3 + */ +int isa_init(struct shrm_dev *shrm) +{ + dev_t dev_id; + int retval, no_dev; + struct isadev_context *isadev; + struct isa_driver_context *isa_context; + + isa_context = kzalloc(sizeof(struct isa_driver_context), + GFP_KERNEL); + shrm->isa_context = isa_context; + if (isa_context == NULL) { + dev_err(shrm->dev, "Failed to alloc memory\n"); + return -ENOMEM; + } + + if (major) { + dev_id = MKDEV(major, 0); + retval = register_chrdev_region(dev_id, ISA_DEVICES, NAME); + } else { + retval = alloc_chrdev_region(&dev_id, 0, ISA_DEVICES, NAME); + major = MAJOR(dev_id); + } + + dev_dbg(shrm->dev, "major %d\n", major); + + cdev_init(&isa_context->cdev, &isa_fops); + isa_context->cdev.owner = THIS_MODULE; + retval = cdev_add(&isa_context->cdev, dev_id, ISA_DEVICES); + if (retval) { + dev_err(shrm->dev, "Failed to add char device\n"); + return retval; + } + + for (no_dev = 0; no_dev < ISA_DEVICES; no_dev++) + atomic_set(&isa_context->is_open[no_dev], 1); + + isa_context->isadev = kzalloc(sizeof + (struct isadev_context)*ISA_DEVICES, + GFP_KERNEL); + if (isa_context->isadev == NULL) { + dev_err(shrm->dev, "Failed to alloc memory\n"); + return -ENOMEM; + } + for (no_dev = 0; no_dev < ISA_DEVICES; no_dev++) { + isadev = &isa_context->isadev[no_dev]; + isadev->device_id = no_dev; + retval = create_queue(&isadev->dl_queue, + isadev->device_id, shrm); + if (retval < 0) { + dev_err(shrm->dev, "create dl_queue failed\n"); + delete_queue(&isadev->dl_queue); + kfree(isadev); + return retval; + } + } + mutex_init(&isa_context->tx_audio_mutex); + spin_lock_init(&isa_context->common_tx); + + dev_err(shrm->dev, "SHRM char driver added\n"); + + return retval; +} + +void isa_exit(struct shrm_dev *shrm) +{ + int no_dev; + struct isadev_context *isadev; + struct isa_driver_context *isa_context = shrm->isa_context; + dev_t dev_id = MKDEV(major, 0); + + for (no_dev = 0; no_dev < ISA_DEVICES; no_dev++) { + isadev = &isa_context->isadev[no_dev]; + delete_queue(&isadev->dl_queue); + kfree(isadev); + } + + cdev_del(&isa_context->cdev); + unregister_chrdev_region(dev_id, ISA_DEVICES); + kfree(isa_context); + + dev_err(shrm->dev, "SHRM char driver removed\n"); +} + +#ifdef CONFIG_HIGH_RES_TIMERS +static enum hrtimer_restart callback(struct hrtimer *timer) +{ + return HRTIMER_NORESTART; +} +#endif + + +static int __init shrm_probe(struct platform_device *pdev) +{ + int err = 0; + struct resource *res; + struct shrm_dev *shrm = NULL; + + if (pdev == NULL) { + dev_err(shrm->dev, + "No device/platform_data found on shm device\n"); + return -ENODEV; + } + + + shrm = kzalloc(sizeof(struct shrm_dev), GFP_KERNEL); + if (shrm == NULL) { + dev_err(shrm->dev, + "Could not allocate memory for struct shm_dev\n"); + return -ENOMEM; + } + shrm->dev = &pdev->dev; + + /* initialise the SHM */ + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + dev_err(shrm->dev, "Unable to map Ca Wake up interrupt\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_wake_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + if (!res) { + dev_err(shrm->dev, + "Unable to map APE_Read_notif_common IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ac_read_notif_0_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 2); + if (!res) { + dev_err(shrm->dev, + "Unable to map APE_Read_notif_audio IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ac_read_notif_1_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 3); + if (!res) { + dev_err(shrm->dev, + "Unable to map Cmt_msg_pending_notif_common IRQbase\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_msg_pending_notif_0_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 4); + if (!res) { + dev_err(shrm->dev, + "Unable to map Cmt_msg_pending_notif_audio IRQ base\n"); + err = -EBUSY; + goto rollback_intr; + } + shrm->ca_msg_pending_notif_1_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(shrm->dev, + "Could not get SHM IO memory information\n"); + err = -ENODEV; + goto rollback_intr; + } + + shrm->intr_base = (void __iomem *)ioremap_nocache(res->start, + res->end - res->start + 1); + + if (!(shrm->intr_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_intr; + } + + shrm->ape_common_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_APE_COMMON_BASE; + shrm->ape_common_fifo_base = + (void __iomem *)ioremap_nocache( + U8500_SHM_FIFO_APE_COMMON_BASE, + SHM_FIFO_0_SIZE); + shrm->ape_common_fifo_size = (SHM_FIFO_0_SIZE)/4; + + if (!(shrm->ape_common_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ape_common_fifo_base; + } + + shrm->cmt_common_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_CMT_COMMON_BASE; + + shrm->cmt_common_fifo_base = + (void __iomem *)ioremap_nocache( + U8500_SHM_FIFO_CMT_COMMON_BASE, SHM_FIFO_0_SIZE); + shrm->cmt_common_fifo_size = (SHM_FIFO_0_SIZE)/4; + + if (!(shrm->cmt_common_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_cmt_common_fifo_base; + } + + shrm->ape_audio_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_APE_AUDIO_BASE; + shrm->ape_audio_fifo_base = + (void __iomem *)ioremap_nocache(U8500_SHM_FIFO_APE_AUDIO_BASE, + SHM_FIFO_1_SIZE); + shrm->ape_audio_fifo_size = (SHM_FIFO_1_SIZE)/4; + + if (!(shrm->ape_audio_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ape_audio_fifo_base; + } + + shrm->cmt_audio_fifo_base_phy = + (u32 *)U8500_SHM_FIFO_CMT_AUDIO_BASE; + shrm->cmt_audio_fifo_base = + (void __iomem *)ioremap_nocache(U8500_SHM_FIFO_CMT_AUDIO_BASE, + SHM_FIFO_1_SIZE); + shrm->cmt_audio_fifo_size = (SHM_FIFO_1_SIZE)/4; + + if (!(shrm->cmt_audio_fifo_base)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_cmt_audio_fifo_base; + } + + shrm->ac_common_shared_wptr = + (void __iomem *)ioremap(SHM_ACFIFO_0_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_common_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_ac_common_shared_wptr; + } + + shrm->ac_common_shared_rptr = + (void __iomem *)ioremap(SHM_ACFIFO_0_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_common_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + shrm->ca_common_shared_wptr = + (void __iomem *)ioremap(SHM_CAFIFO_0_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_common_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + shrm->ca_common_shared_rptr = + (void __iomem *)ioremap(SHM_CAFIFO_0_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_common_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + shrm->ac_audio_shared_wptr = + (void __iomem *)ioremap(SHM_ACFIFO_1_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_audio_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + shrm->ac_audio_shared_rptr = + (void __iomem *)ioremap(SHM_ACFIFO_1_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ac_audio_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + shrm->ca_audio_shared_wptr = + (void __iomem *)ioremap(SHM_CAFIFO_1_WRITE_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_audio_shared_wptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + shrm->ca_audio_shared_rptr = + (void __iomem *)ioremap(SHM_CAFIFO_1_READ_AMCU, SHM_PTR_SIZE); + + if (!(shrm->ca_audio_shared_rptr)) { + dev_err(shrm->dev, "Unable to map register base\n"); + err = -EBUSY; + goto rollback_map; + } + + + if (isa_init(shrm) != 0) { + dev_err(shrm->dev, "Driver Initialization Error\n"); + err = -EBUSY; + } + /* install handlers and tasklets */ + if (shm_initialise_irq(shrm)) { + dev_err(shrm->dev, "shm error in interrupt registration\n"); + goto rollback_irq; + } + +#ifdef CONFIG_HIGH_RES_TIMERS + hrtimer_init(&timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + timer.function = callback; + + hrtimer_start(&timer, ktime_set(0, 2*NSEC_PER_MSEC), HRTIMER_MODE_REL); +#endif + + return err; + +rollback_irq: + free_shm_irq(shrm); +rollback_map: + iounmap(shrm->ac_common_shared_wptr); + iounmap(shrm->ac_common_shared_rptr); + iounmap(shrm->ca_common_shared_wptr); + iounmap(shrm->ca_common_shared_rptr); + iounmap(shrm->ac_audio_shared_wptr); + iounmap(shrm->ac_audio_shared_rptr); + iounmap(shrm->ca_audio_shared_wptr); + iounmap(shrm->ca_audio_shared_rptr); +rollback_ac_common_shared_wptr: + iounmap(shrm->cmt_audio_fifo_base); +rollback_cmt_audio_fifo_base: + iounmap(shrm->ape_audio_fifo_base); +rollback_ape_audio_fifo_base: + iounmap(shrm->cmt_common_fifo_base); +rollback_cmt_common_fifo_base: + iounmap(shrm->ape_common_fifo_base); +rollback_ape_common_fifo_base: + iounmap(shrm->intr_base); +rollback_intr: + kfree(shrm); + return err; +} + +static int __exit shrm_remove(struct platform_device *pdev) +{ + struct shrm_dev *shrm = platform_get_drvdata(pdev); + + free_shm_irq(shrm); + iounmap(shrm->intr_base); + iounmap(shrm->ape_common_fifo_base); + iounmap(shrm->cmt_common_fifo_base); + iounmap(shrm->ape_audio_fifo_base); + iounmap(shrm->cmt_audio_fifo_base); + iounmap(shrm->ac_common_shared_wptr); + iounmap(shrm->ac_common_shared_rptr); + iounmap(shrm->ca_common_shared_wptr); + iounmap(shrm->ca_common_shared_rptr); + iounmap(shrm->ac_audio_shared_wptr); + iounmap(shrm->ac_audio_shared_rptr); + iounmap(shrm->ca_audio_shared_wptr); + iounmap(shrm->ca_audio_shared_rptr); + kfree(shrm); + isa_exit(shrm); + + return 0; +} +#ifdef CONFIG_PM + +/** + * u8500_shrm_suspend() - This routine puts the SHRM in to sustend state. + * @pdev: platform device. + * + * This routine checks the current ongoing communication with Modem by + * examining the ca_wake state and prevents suspend if modem communication + * is on-going. + * If ca_wake = 1 (high), modem comm. is on-going; don't suspend + * If ca_wake = 0 (low), no comm. with modem on-going.Allow suspend + */ +int u8500_shrm_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct shrm_dev *shrm = platform_get_drvdata(pdev); + + dev_dbg(shrm->dev, "%s called...\n", __func__); + dev_dbg(shrm->dev, "\n ca_wake_req_state = %x\n", + get_ca_wake_req_state()); + /* if ca_wake_req is high, prevent system suspend */ + if (get_ca_wake_req_state()) + return -EBUSY; + else + return 0; +} + +/** + * u8500_shrm_resume() - This routine resumes the SHRM from sustend state. + * @pdev: platform device. + * + * This routine restore back the current state of the SHRM + */ +int u8500_shrm_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct shrm_dev *shrm = platform_get_drvdata(pdev); + + dev_dbg(shrm->dev, "%s called...\n", __func__); + /* TODO: + * As of now, no state save takes place in suspend. + * So, nothing to restore in resume. + * Simply return as of now. + * State saved in suspend should be restored here. + */ + + return 0; +} + +static const struct dev_pm_ops shrm_dev_pm_ops = { + .suspend = u8500_shrm_suspend, + .resume = u8500_shrm_resume, +}; +#endif + +static struct platform_driver shrm_driver = { + .remove = __exit_p(shrm_remove), + .driver = { + .name = "u8500_shrm", + .owner = THIS_MODULE, +#ifdef CONFIG_PM + .pm = &shrm_dev_pm_ops, +#endif + }, +}; + +static int __init shrm_driver_init(void) +{ + return platform_driver_probe(&shrm_driver, shrm_probe); +} + +static void __exit shrm_driver_exit(void) +{ + platform_driver_unregister(&shrm_driver); +} + +module_init(shrm_driver_init); +module_exit(shrm_driver_exit); + +MODULE_AUTHOR("Biju Das"); +MODULE_DESCRIPTION("Shared Memory Modem Driver Interface"); +MODULE_LICENSE("GPL"); diff --git a/drivers/modem/shrm/shrm_fifo.c b/drivers/modem/shrm/shrm_fifo.c new file mode 100644 index 00000000000..5fe9f3c5724 --- /dev/null +++ b/drivers/modem/shrm/shrm_fifo.c @@ -0,0 +1,837 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Biju Das <biju.das@stericsson.com> for ST-Ericsson + * Author: Kumar Sanghavi <kumar.sanghvi@stericsson.com> for ST-Ericsson + * Author: Arun Murthy <arun.murthy@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/modem/shrm/shrm.h> +#include <linux/modem/shrm/shrm_driver.h> +#include <linux/modem/shrm/shrm_private.h> +#include <linux/modem/shrm/shrm_net.h> +#include <linux/mfd/dbx500-prcmu.h> + +#define L1_BOOT_INFO_REQ 1 +#define L1_BOOT_INFO_RESP 2 +#define L1_NORMAL_MSG 3 +#define L1_HEADER_MASK 28 +#define L1_MAPID_MASK 0xF0000000 +#define CONFIG_OFFSET 8 +#define COUNTER_OFFSET 20 +#define L2_HEADER_SIZE 4 +#define L2_HEADER_OFFSET 24 +#define MASK_0_15_BIT 0xFF +#define MASK_16_31_BIT 0xFF00 +#define MASK_16_27_BIT 0xFFF0000 +#define MASK_0_39_BIT 0xFFFFF +#define MASK_40_55_BIT 0xFF00000 +#define MASK_8_16_BIT 0x0000FF00 +#define MSG_LEN_OFFSET 16 +#define SHRM_VER 2 +#define ca_ist_inactivity_timer 25 /*25ms */ +#define ca_csc_inactivity_timer 25 /*25ms */ + +static u8 msg_audio_counter; +static u8 msg_common_counter; + +struct fifo_write_params ape_shm_fifo_0; +struct fifo_write_params ape_shm_fifo_1; +struct fifo_read_params cmt_shm_fifo_0; +struct fifo_read_params cmt_shm_fifo_1; + + +static u8 cmt_read_notif_0_send; +static u8 cmt_read_notif_1_send; + +void shm_fifo_init(struct shrm_dev *shrm) +{ + ape_shm_fifo_0.writer_local_wptr = 0; + ape_shm_fifo_0.writer_local_rptr = 0; + *((u32 *)shrm->ac_common_shared_wptr) = 0; + *((u32 *)shrm->ac_common_shared_rptr) = 0; + ape_shm_fifo_0.shared_wptr = 0; + ape_shm_fifo_0.shared_rptr = 0; + ape_shm_fifo_0.availablesize = shrm->ape_common_fifo_size; + ape_shm_fifo_0.end_addr_fifo = shrm->ape_common_fifo_size; + ape_shm_fifo_0.fifo_virtual_addr = shrm->ape_common_fifo_base; + spin_lock_init(&ape_shm_fifo_0.fifo_update_lock); + + + cmt_shm_fifo_0.reader_local_rptr = 0; + cmt_shm_fifo_0.reader_local_wptr = 0; + cmt_shm_fifo_0.shared_wptr = + *((u32 *)shrm->ca_common_shared_wptr); + cmt_shm_fifo_0.shared_rptr = + *((u32 *)shrm->ca_common_shared_rptr); + cmt_shm_fifo_0.availablesize = shrm->cmt_common_fifo_size; + cmt_shm_fifo_0.end_addr_fifo = shrm->cmt_common_fifo_size; + cmt_shm_fifo_0.fifo_virtual_addr = shrm->cmt_common_fifo_base; + + ape_shm_fifo_1.writer_local_wptr = 0; + ape_shm_fifo_1.writer_local_rptr = 0; + ape_shm_fifo_1.shared_wptr = 0; + ape_shm_fifo_1.shared_rptr = 0; + *((u32 *)shrm->ac_audio_shared_wptr) = 0; + *((u32 *)shrm->ac_audio_shared_rptr) = 0; + ape_shm_fifo_1.availablesize = shrm->ape_audio_fifo_size; + ape_shm_fifo_1.end_addr_fifo = shrm->ape_audio_fifo_size; + ape_shm_fifo_1.fifo_virtual_addr = shrm->ape_audio_fifo_base; + spin_lock_init(&ape_shm_fifo_1.fifo_update_lock); + + cmt_shm_fifo_1.reader_local_rptr = 0; + cmt_shm_fifo_1.reader_local_wptr = 0; + cmt_shm_fifo_1.shared_wptr = + *((u32 *)shrm->ca_audio_shared_wptr); + cmt_shm_fifo_1.shared_rptr = + *((u32 *)shrm->ca_audio_shared_rptr); + cmt_shm_fifo_1.availablesize = shrm->cmt_audio_fifo_size; + cmt_shm_fifo_1.end_addr_fifo = shrm->cmt_audio_fifo_size; + cmt_shm_fifo_1.fifo_virtual_addr = shrm->cmt_audio_fifo_base; + msg_audio_counter = 0; + msg_common_counter = 0; +} + +u8 read_boot_info_req(struct shrm_dev *shrm, + u32 *config, + u32 *version) +{ + struct fifo_read_params *fifo = &cmt_shm_fifo_0; + u32 *msg; + u32 header = 0; + u8 msgtype; + + /* Read L1 header read content of reader_local_rptr */ + msg = (u32 *) + (fifo->reader_local_rptr + fifo->fifo_virtual_addr); + header = *msg; + msgtype = (header & L1_MAPID_MASK) >> L1_MSG_MAPID_OFFSET; + if (msgtype != L1_BOOT_INFO_REQ) { + dev_err(shrm->dev, "Read_Boot_Info_Req Fatal ERROR\n"); + dev_err(shrm->dev, "Received msgtype is %d\n", msgtype); + dev_info(shrm->dev, "Initiating a modem reset\n"); + queue_kthread_work(&shrm->shm_ac_wake_kw, + &shrm->shm_mod_reset_req); + return 0; + } + *config = (header >> CONFIG_OFFSET) & MASK_0_15_BIT; + *version = header & MASK_0_15_BIT; + fifo->reader_local_rptr += 1; + + return 1; +} + +void write_boot_info_resp(struct shrm_dev *shrm, u32 config, + u32 version) +{ + struct fifo_write_params *fifo = &ape_shm_fifo_0; + u32 *msg; + u8 msg_length; + version = SHRM_VER; + + spin_lock_bh(&fifo->fifo_update_lock); + /* Read L1 header read content of reader_local_rptr */ + msg = (u32 *) + (fifo->writer_local_wptr+fifo->fifo_virtual_addr); + if (version < 1) { + *msg = ((L1_BOOT_INFO_RESP << L1_MSG_MAPID_OFFSET) | + ((config << CONFIG_OFFSET) & MASK_16_31_BIT) + | (version & MASK_0_15_BIT)); + msg_length = 1; + } else { + *msg = ((L1_BOOT_INFO_RESP << L1_MSG_MAPID_OFFSET) | + ((0x8 << MSG_LEN_OFFSET) & MASK_16_27_BIT) | + ((config << CONFIG_OFFSET) & MASK_8_16_BIT)| + version); + msg++; + *msg = ca_ist_inactivity_timer; + msg++; + *msg = ca_csc_inactivity_timer; + msg_length = L1_NORMAL_MSG; + } + fifo->writer_local_wptr += msg_length; + fifo->availablesize -= msg_length; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +/** + * shm_write_msg_to_fifo() - write message to FIFO + * @shrm: pointer to shrm device information structure + * @channel: audio or common channel + * @l2header: L2 header or device ID + * @addr: pointer to write buffer address + * @length: length of mst to write + * + * Function Which Writes the data into Fifo in IPC zone + * It is called from shm_write_msg. This function will copy the msg + * from the kernel buffer to FIFO. There are 4 kernel buffers from where + * the data is to copied to FIFO one for each of the messages ISI, RPC, + * AUDIO and SECURITY. ISI, RPC and SECURITY messages are pushed to FIFO + * in commmon channel and AUDIO message is pushed onto audio channel FIFO. + */ +int shm_write_msg_to_fifo(struct shrm_dev *shrm, u8 channel, + u8 l2header, void *addr, u32 length) +{ + struct fifo_write_params *fifo = NULL; + u32 l1_header = 0, l2_header = 0; + u32 requiredsize; + u32 size = 0; + u32 *msg; + u8 *src; + + if (channel == COMMON_CHANNEL) + fifo = &ape_shm_fifo_0; + else if (channel == AUDIO_CHANNEL) + fifo = &ape_shm_fifo_1; + else { + dev_err(shrm->dev, "invalid channel\n"); + return -EINVAL; + } + + /* L2 size in 32b */ + requiredsize = ((length + 3) / 4); + /* Add size of L1 & L2 header */ + requiredsize += 2; + + /* if availablesize = or < requiredsize then error */ + if (fifo->availablesize <= requiredsize) { + /* Fatal ERROR - should never happens */ + dev_dbg(shrm->dev, "wr_wptr= %x\n", + fifo->writer_local_wptr); + dev_dbg(shrm->dev, "wr_rptr= %x\n", + fifo->writer_local_rptr); + dev_dbg(shrm->dev, "shared_wptr= %x\n", + fifo->shared_wptr); + dev_dbg(shrm->dev, "shared_rptr= %x\n", + fifo->shared_rptr); + dev_dbg(shrm->dev, "availsize= %x\n", + fifo->availablesize); + dev_dbg(shrm->dev, "end__fifo= %x\n", + fifo->end_addr_fifo); + dev_warn(shrm->dev, "Modem is busy, please wait." + " c_cnt = %d; a_cnt = %d\n", msg_common_counter, + msg_audio_counter); + if (channel == COMMON_CHANNEL) { + dev_warn(shrm->dev, + "Modem is lagging behind in reading." + "Stopping n/w dev queue\n"); + shrm_stop_netdev(shrm->ndev); + } + + return -EAGAIN; + } + + if (channel == COMMON_CHANNEL) { + /* build L1 header */ + l1_header = ((L1_NORMAL_MSG << L1_MSG_MAPID_OFFSET) | + (((msg_common_counter++) << COUNTER_OFFSET) + & MASK_40_55_BIT) | + ((length + L2_HEADER_SIZE) & MASK_0_39_BIT)); + } else if (channel == AUDIO_CHANNEL) { + /* build L1 header */ + l1_header = ((L1_NORMAL_MSG << L1_MSG_MAPID_OFFSET) | + (((msg_audio_counter++) << COUNTER_OFFSET) + & MASK_40_55_BIT) | + ((length + L2_HEADER_SIZE) & MASK_0_39_BIT)); + } + + /* + * Need to take care race condition for fifo->availablesize + * & fifo->writer_local_rptr with Ac_Read_notification interrupt. + * One option could be use stack variable for LocalRptr and recompute + * fifo->availablesize,based on flag enabled in the + * Ac_read_notification + */ + l2_header = ((l2header << L2_HEADER_OFFSET) | + ((length) & MASK_0_39_BIT)); + spin_lock_bh(&fifo->fifo_update_lock); + /* Check Local Rptr is less than or equal to Local WPtr */ + if (fifo->writer_local_rptr <= fifo->writer_local_wptr) { + msg = (u32 *) + (fifo->fifo_virtual_addr+fifo->writer_local_wptr); + + /* check enough place bewteen writer_local_wptr & end of FIFO */ + if ((fifo->end_addr_fifo-fifo->writer_local_wptr) >= + requiredsize) { + /* Add L1 header and L2 header */ + *msg = l1_header; + msg++; + *msg = l2_header; + msg++; + + /* copy the l2 message in 1 memcpy */ + memcpy((void *)msg, addr, length); + /* UpdateWptr */ + fifo->writer_local_wptr += requiredsize; + fifo->availablesize -= requiredsize; + fifo->writer_local_wptr %= fifo->end_addr_fifo; + } else { + /* + * message is split between and of FIFO and beg of FIFO + * copy first part from writer_local_wptr to end of FIFO + */ + size = fifo->end_addr_fifo-fifo->writer_local_wptr; + + if (size == 1) { + /* Add L1 header */ + *msg = l1_header; + msg++; + /* UpdateWptr */ + fifo->writer_local_wptr = 0; + fifo->availablesize -= size; + /* + * copy second part from beg of FIFO + * with remaining part of msg + */ + msg = (u32 *) + fifo->fifo_virtual_addr; + *msg = l2_header; + msg++; + + /* copy the l3 message in 1 memcpy */ + memcpy((void *)msg, addr, length); + /* UpdateWptr */ + fifo->writer_local_wptr += + requiredsize-size; + fifo->availablesize -= + (requiredsize-size); + } else if (size == 2) { + /* Add L1 header and L2 header */ + *msg = l1_header; + msg++; + *msg = l2_header; + msg++; + + /* UpdateWptr */ + fifo->writer_local_wptr = 0; + fifo->availablesize -= size; + + /* + * copy second part from beg of FIFO + * with remaining part of msg + */ + msg = (u32 *) + fifo->fifo_virtual_addr; + /* copy the l3 message in 1 memcpy */ + memcpy((void *)msg, addr, length); + + /* UpdateWptr */ + fifo->writer_local_wptr += + requiredsize-size; + fifo->availablesize -= + (requiredsize-size); + } else { + /* Add L1 header and L2 header */ + *msg = l1_header; + msg++; + *msg = l2_header; + msg++; + + /* copy the l2 message in 1 memcpy */ + memcpy((void *)msg, addr, (size-2)*4); + + + /* UpdateWptr */ + fifo->writer_local_wptr = 0; + fifo->availablesize -= size; + + /* + * copy second part from beg of FIFO + * with remaining part of msg + */ + msg = (u32 *)fifo->fifo_virtual_addr; + src = (u8 *)addr+((size - 2) * 4); + memcpy((void *)msg, src, + (length-((size - 2) * 4))); + + /* UpdateWptr */ + fifo->writer_local_wptr += + requiredsize-size; + fifo->availablesize -= + (requiredsize-size); + } + + } + } else { + /* writer_local_rptr > writer_local_wptr */ + msg = (u32 *) + (fifo->fifo_virtual_addr+fifo->writer_local_wptr); + /* Add L1 header and L2 header */ + *msg = l1_header; + msg++; + *msg = l2_header; + msg++; + /* + * copy message possbile between writer_local_wptr up + * to writer_local_rptr copy the l3 message in 1 memcpy + */ + memcpy((void *)msg, addr, length); + + /* UpdateWptr */ + fifo->writer_local_wptr += requiredsize; + fifo->availablesize -= requiredsize; + + } + spin_unlock_bh(&fifo->fifo_update_lock); + return length; +} + +/** + * read_one_l2msg_common() - read message from common channel + * @shrm: pointer to shrm device information structure + * @l2_msg: pointer to the read L2 message buffer + * @len: message length + * + * This function read one message from the FIFO and returns l2 header type + */ +u8 read_one_l2msg_common(struct shrm_dev *shrm, + u8 *l2_msg, u32 *len) +{ + struct fifo_read_params *fifo = &cmt_shm_fifo_0; + + u32 *msg; + u32 l1_header = 0; + u32 l2_header = 0; + u32 length; + u8 msgtype; + u32 msg_size; + u32 size = 0; + + /* Read L1 header read content of reader_local_rptr */ + msg = (u32 *) + (fifo->reader_local_rptr+fifo->fifo_virtual_addr); + l1_header = *msg++; + msgtype = (l1_header & 0xF0000000) >> L1_HEADER_MASK; + + if (msgtype != L1_NORMAL_MSG) { + /* Fatal ERROR - should never happens */ + dev_info(shrm->dev, "wr_wptr= %x\n", + fifo->reader_local_wptr); + dev_info(shrm->dev, "wr_rptr= %x\n", + fifo->reader_local_rptr); + dev_info(shrm->dev, "shared_wptr= %x\n", + fifo->shared_wptr); + dev_info(shrm->dev, "shared_rptr= %x\n", + fifo->shared_rptr); + dev_info(shrm->dev, "availsize= %x\n", + fifo->availablesize); + dev_info(shrm->dev, "end_fifo= %x\n", + fifo->end_addr_fifo); + /* Fatal ERROR - should never happens */ + dev_crit(shrm->dev, "Fatal ERROR - should never happen\n"); + dev_info(shrm->dev, "Initiating a modem reset\n"); + queue_kthread_work(&shrm->shm_ac_wake_kw, + &shrm->shm_mod_reset_req); + } + if (fifo->reader_local_rptr == (fifo->end_addr_fifo-1)) { + l2_header = (*((u32 *)fifo->fifo_virtual_addr)); + length = l2_header & MASK_0_39_BIT; + } else { + /* Read L2 header,Msg size & content of reader_local_rptr */ + l2_header = *msg; + length = l2_header & MASK_0_39_BIT; + } + + *len = length; + msg_size = ((length + 3) / 4); + msg_size += 2; + + if (fifo->reader_local_rptr + msg_size <= + fifo->end_addr_fifo) { + /* Skip L2 header */ + msg++; + + /* read msg between reader_local_rptr and end of FIFO */ + memcpy((void *)l2_msg, (void *)msg, length); + /* UpdateLocalRptr */ + fifo->reader_local_rptr += msg_size; + fifo->reader_local_rptr %= fifo->end_addr_fifo; + } else { + /* + * msg split between end of FIFO and beg copy first + * part of msg read msg between reader_local_rptr + * and end of FIFO + */ + size = fifo->end_addr_fifo-fifo->reader_local_rptr; + if (size == 1) { + msg = (u32 *)(fifo->fifo_virtual_addr); + /* Skip L2 header */ + msg++; + memcpy((void *)l2_msg, (void *)(msg), length); + } else if (size == 2) { + /* Skip L2 header */ + msg++; + msg = (u32 *)(fifo->fifo_virtual_addr); + memcpy((void *)l2_msg, + (void *)(msg), length); + } else { + /* Skip L2 header */ + msg++; + memcpy((void *)l2_msg, (void *)msg, ((size - 2) * 4)); + /* copy second part of msg */ + l2_msg += ((size - 2) * 4); + msg = (u32 *)(fifo->fifo_virtual_addr); + memcpy((void *)l2_msg, (void *)(msg), + (length-((size - 2) * 4))); + } + fifo->reader_local_rptr = + (fifo->reader_local_rptr+msg_size) % + fifo->end_addr_fifo; + } + return (l2_header>>L2_HEADER_OFFSET) & MASK_0_15_BIT; + } + +u8 read_remaining_messages_common() +{ + struct fifo_read_params *fifo = &cmt_shm_fifo_0; + /* + * There won't be any Race condition reader_local_rptr & + * fifo->reader_local_wptr with CaMsgpending Notification Interrupt + */ + return ((fifo->reader_local_rptr != fifo->reader_local_wptr) ? 1 : 0); +} + +u8 read_one_l2msg_audio(struct shrm_dev *shrm, + u8 *l2_msg, u32 *len) +{ + struct fifo_read_params *fifo = &cmt_shm_fifo_1; + + u32 *msg; + u32 l1_header = 0; + u32 l2_header = 0; + u32 length; + u8 msgtype; + u32 msg_size; + u32 size = 0; + + /* Read L1 header read content of reader_local_rptr */ + msg = (u32 *) + (fifo->reader_local_rptr+fifo->fifo_virtual_addr); + l1_header = *msg++; + msgtype = (l1_header & 0xF0000000) >> L1_HEADER_MASK; + + if (msgtype != L1_NORMAL_MSG) { + /* Fatal ERROR - should never happens */ + dev_info(shrm->dev, "wr_local_wptr= %x\n", + fifo->reader_local_wptr); + dev_info(shrm->dev, "wr_local_rptr= %x\n", + fifo->reader_local_rptr); + dev_info(shrm->dev, "shared_wptr= %x\n", + fifo->shared_wptr); + dev_info(shrm->dev, "shared_rptr= %x\n", + fifo->shared_rptr); + dev_info(shrm->dev, "availsize=%x\n", + fifo->availablesize); + dev_info(shrm->dev, "end_fifo= %x\n", + fifo->end_addr_fifo); + dev_info(shrm->dev, "Received msgtype is %d\n", msgtype); + /* Fatal ERROR - should never happens */ + dev_crit(shrm->dev, "Fatal ERROR - should never happen\n"); + dev_info(shrm->dev, "Initiating a modem reset\n"); + queue_kthread_work(&shrm->shm_ac_wake_kw, + &shrm->shm_mod_reset_req); + } + if (fifo->reader_local_rptr == (fifo->end_addr_fifo-1)) { + l2_header = (*((u32 *)fifo->fifo_virtual_addr)); + length = l2_header & MASK_0_39_BIT; + } else { + /* Read L2 header,Msg size & content of reader_local_rptr */ + l2_header = *msg; + length = l2_header & MASK_0_39_BIT; + } + + *len = length; + msg_size = ((length + 3) / 4); + msg_size += 2; + + if (fifo->reader_local_rptr + msg_size <= + fifo->end_addr_fifo) { + /* Skip L2 header */ + msg++; + /* read msg between reader_local_rptr and end of FIFO */ + memcpy((void *)l2_msg, (void *)msg, length); + /* UpdateLocalRptr */ + fifo->reader_local_rptr += msg_size; + fifo->reader_local_rptr %= fifo->end_addr_fifo; + } else { + + /* + * msg split between end of FIFO and beg + * copy first part of msg + * read msg between reader_local_rptr and end of FIFO + */ + size = fifo->end_addr_fifo-fifo->reader_local_rptr; + if (size == 1) { + msg = (u32 *)(fifo->fifo_virtual_addr); + /* Skip L2 header */ + msg++; + memcpy((void *)l2_msg, (void *)(msg), length); + } else if (size == 2) { + /* Skip L2 header */ + msg++; + msg = (u32 *)(fifo->fifo_virtual_addr); + memcpy((void *)l2_msg, (void *)(msg), length); + } else { + /* Skip L2 header */ + msg++; + memcpy((void *)l2_msg, (void *)msg, ((size - 2) * 4)); + /* copy second part of msg */ + l2_msg += ((size - 2) * 4); + msg = (u32 *)(fifo->fifo_virtual_addr); + memcpy((void *)l2_msg, (void *)(msg), + (length-((size - 2) * 4))); + } + fifo->reader_local_rptr = + (fifo->reader_local_rptr+msg_size) % + fifo->end_addr_fifo; + + } + return (l2_header>>L2_HEADER_OFFSET) & MASK_0_15_BIT; + } + +u8 read_remaining_messages_audio() +{ + struct fifo_read_params *fifo = &cmt_shm_fifo_1; + + return ((fifo->reader_local_rptr != fifo->reader_local_wptr) ? + 1 : 0); +} + +u8 is_the_only_one_unread_message(struct shrm_dev *shrm, + u8 channel, u32 length) +{ + struct fifo_write_params *fifo = NULL; + u32 messagesize = 0; + u8 is_only_one_unread_msg = 0; + + if (channel == COMMON_CHANNEL) + fifo = &ape_shm_fifo_0; + else /* channel = AUDIO_CHANNEL */ + fifo = &ape_shm_fifo_1; + + /* L3 size in 32b */ + messagesize = ((length + 3) / 4); + /* Add size of L1 & L2 header */ + messagesize += 2; + /* + * possibility of race condition with Ac Read notification interrupt. + * need to check ? + */ + if (fifo->writer_local_wptr > fifo->writer_local_rptr) + is_only_one_unread_msg = + ((fifo->writer_local_rptr + messagesize) == + fifo->writer_local_wptr) ? 1 : 0; + else + /* Msg split between end of fifo and starting of Fifo */ + is_only_one_unread_msg = + (((fifo->writer_local_rptr + messagesize) % + fifo->end_addr_fifo) == fifo->writer_local_wptr) ? + 1 : 0; + + return is_only_one_unread_msg; +} + +void update_ca_common_local_wptr(struct shrm_dev *shrm) +{ + /* + * update CA common reader local write pointer with the + * shared write pointer + */ + struct fifo_read_params *fifo = &cmt_shm_fifo_0; + + fifo->shared_wptr = + (*((u32 *)shrm->ca_common_shared_wptr)); + fifo->reader_local_wptr = fifo->shared_wptr; +} + +void update_ca_audio_local_wptr(struct shrm_dev *shrm) +{ + /* + * update CA audio reader local write pointer with the + * shared write pointer + */ + struct fifo_read_params *fifo = &cmt_shm_fifo_1; + + fifo->shared_wptr = + (*((u32 *)shrm->ca_audio_shared_wptr)); + fifo->reader_local_wptr = fifo->shared_wptr; +} + +void update_ac_common_local_rptr(struct shrm_dev *shrm) +{ + /* + * update AC common writer local read pointer with the + * shared read pointer + */ + struct fifo_write_params *fifo; + u32 free_space = 0; + + fifo = &ape_shm_fifo_0; + + spin_lock_bh(&fifo->fifo_update_lock); + fifo->shared_rptr = + (*((u32 *)shrm->ac_common_shared_rptr)); + + if (fifo->shared_rptr >= fifo->writer_local_rptr) + free_space = + (fifo->shared_rptr-fifo->writer_local_rptr); + else { + free_space = + (fifo->end_addr_fifo-fifo->writer_local_rptr); + free_space += fifo->shared_rptr; + } + + /* Chance of race condition of below variables with write_msg */ + fifo->availablesize += free_space; + fifo->writer_local_rptr = fifo->shared_rptr; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +void update_ac_audio_local_rptr(struct shrm_dev *shrm) +{ + /* + * update AC audio writer local read pointer with the + * shared read pointer + */ + struct fifo_write_params *fifo; + u32 free_space = 0; + + fifo = &ape_shm_fifo_1; + spin_lock_bh(&fifo->fifo_update_lock); + fifo->shared_rptr = + (*((u32 *)shrm->ac_audio_shared_rptr)); + + if (fifo->shared_rptr >= fifo->writer_local_rptr) + free_space = + (fifo->shared_rptr-fifo->writer_local_rptr); + else { + free_space = + (fifo->end_addr_fifo-fifo->writer_local_rptr); + free_space += fifo->shared_rptr; + } + + /* Chance of race condition of below variables with write_msg */ + fifo->availablesize += free_space; + fifo->writer_local_rptr = fifo->shared_rptr; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +void update_ac_common_shared_wptr(struct shrm_dev *shrm) +{ + /* + * update AC common shared write pointer with the + * local write pointer + */ + struct fifo_write_params *fifo; + + fifo = &ape_shm_fifo_0; + spin_lock_bh(&fifo->fifo_update_lock); + /* Update shared pointer fifo offset of the IPC zone */ + (*((u32 *)shrm->ac_common_shared_wptr)) = + fifo->writer_local_wptr; + + fifo->shared_wptr = fifo->writer_local_wptr; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +void update_ac_audio_shared_wptr(struct shrm_dev *shrm) +{ + /* + * update AC audio shared write pointer with the + * local write pointer + */ + struct fifo_write_params *fifo; + + fifo = &ape_shm_fifo_1; + spin_lock_bh(&fifo->fifo_update_lock); + /* Update shared pointer fifo offset of the IPC zone */ + (*((u32 *)shrm->ac_audio_shared_wptr)) = + fifo->writer_local_wptr; + fifo->shared_wptr = fifo->writer_local_wptr; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +void update_ca_common_shared_rptr(struct shrm_dev *shrm) +{ + /* + * update CA common shared read pointer with the + * local read pointer + */ + struct fifo_read_params *fifo; + + fifo = &cmt_shm_fifo_0; + + /* Update shared pointer fifo offset of the IPC zone */ + (*((u32 *)shrm->ca_common_shared_rptr)) = + fifo->reader_local_rptr; + fifo->shared_rptr = fifo->reader_local_rptr; +} + +void update_ca_audio_shared_rptr(struct shrm_dev *shrm) +{ + /* + * update CA audio shared read pointer with the + * local read pointer + */ + struct fifo_read_params *fifo; + + fifo = &cmt_shm_fifo_1; + + /* Update shared pointer fifo offset of the IPC zone */ + (*((u32 *)shrm->ca_audio_shared_rptr)) = + fifo->reader_local_rptr; + fifo->shared_rptr = fifo->reader_local_rptr; +} + +void get_reader_pointers(u8 channel_type, u32 *reader_local_rptr, + u32 *reader_local_wptr, u32 *shared_rptr) +{ + struct fifo_read_params *fifo = NULL; + + if (channel_type == COMMON_CHANNEL) + fifo = &cmt_shm_fifo_0; + else /* channel_type = AUDIO_CHANNEL */ + fifo = &cmt_shm_fifo_1; + + *reader_local_rptr = fifo->reader_local_rptr; + *reader_local_wptr = fifo->reader_local_wptr; + *shared_rptr = fifo->shared_rptr; +} + +void get_writer_pointers(u8 channel_type, u32 *writer_local_rptr, + u32 *writer_local_wptr, u32 *shared_wptr) +{ + struct fifo_write_params *fifo = NULL; + + if (channel_type == COMMON_CHANNEL) + fifo = &ape_shm_fifo_0; + else /* channel_type = AUDIO_CHANNEL */ + fifo = &ape_shm_fifo_1; + + spin_lock_bh(&fifo->fifo_update_lock); + *writer_local_rptr = fifo->writer_local_rptr; + *writer_local_wptr = fifo->writer_local_wptr; + *shared_wptr = fifo->shared_wptr; + spin_unlock_bh(&fifo->fifo_update_lock); +} + +void set_ca_msg_0_read_notif_send(u8 val) +{ + cmt_read_notif_0_send = val; +} + +u8 get_ca_msg_0_read_notif_send(void) +{ + return cmt_read_notif_0_send; +} + +void set_ca_msg_1_read_notif_send(u8 val) +{ + cmt_read_notif_1_send = val; +} + +u8 get_ca_msg_1_read_notif_send(void) +{ + return cmt_read_notif_1_send; +} diff --git a/drivers/modem/shrm/shrm_protocol.c b/drivers/modem/shrm/shrm_protocol.c new file mode 100644 index 00000000000..f029f4e0cfa --- /dev/null +++ b/drivers/modem/shrm/shrm_protocol.c @@ -0,0 +1,1546 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Biju Das <biju.das@stericsson.com> for ST-Ericsson + * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com> for ST-Ericsson + * Author: Arun Murthy <arun.murthy@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/hrtimer.h> +#include <linux/delay.h> +#include <linux/netlink.h> +#include <linux/kthread.h> +#include <linux/modem/shrm/shrm.h> +#include <linux/modem/shrm/shrm_driver.h> +#include <linux/modem/shrm/shrm_private.h> +#include <linux/modem/shrm/shrm_net.h> +#include <linux/modem/modem_client.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/mfd/abx500.h> +#include <mach/reboot_reasons.h> +#include <mach/suspend.h> +#include <mach/prcmu-debug.h> + +#define L2_HEADER_ISI 0x0 +#define L2_HEADER_RPC 0x1 +#define L2_HEADER_AUDIO 0x2 +#define L2_HEADER_SECURITY 0x3 +#define L2_HEADER_COMMON_SIMPLE_LOOPBACK 0xC0 +#define L2_HEADER_COMMON_ADVANCED_LOOPBACK 0xC1 +#define L2_HEADER_AUDIO_SIMPLE_LOOPBACK 0x80 +#define L2_HEADER_AUDIO_ADVANCED_LOOPBACK 0x81 +#define L2_HEADER_CIQ 0xC3 +#define L2_HEADER_RTC_CALIBRATION 0xC8 +#define MAX_PAYLOAD 1024 +#define MOD_STUCK_TIMEOUT 6 +#define FIFO_FULL_TIMEOUT 1 +#define PRCM_MOD_AWAKE_STATUS_PRCM_MOD_COREPD_AWAKE BIT(0) +#define PRCM_MOD_AWAKE_STATUS_PRCM_MOD_AAPD_AWAKE BIT(1) +#define PRCM_MOD_AWAKE_STATUS_PRCM_MOD_VMODEM_OFF_ISO BIT(2) +#define PRCM_MOD_PURESET BIT(0) +#define PRCM_MOD_SW_RESET BIT(1) + +#define PRCM_HOSTACCESS_REQ 0x334 +#define PRCM_MOD_AWAKE_STATUS 0x4A0 +#define PRCM_MOD_RESETN_VAL 0x204 + +static u8 boot_state = BOOT_INIT; +static u8 recieve_common_msg[8*1024]; +static u8 recieve_audio_msg[8*1024]; +static received_msg_handler rx_common_handler; +static received_msg_handler rx_audio_handler; +static struct hrtimer timer; +static struct hrtimer mod_stuck_timer_0; +static struct hrtimer mod_stuck_timer_1; +static struct hrtimer fifo_full_timer; +struct sock *shrm_nl_sk; + +static char shrm_common_tx_state = SHRM_SLEEP_STATE; +static char shrm_common_rx_state = SHRM_SLEEP_STATE; +static char shrm_audio_tx_state = SHRM_SLEEP_STATE; +static char shrm_audio_rx_state = SHRM_SLEEP_STATE; + +static atomic_t ac_sleep_disable_count = ATOMIC_INIT(0); +static atomic_t ac_msg_pend_1 = ATOMIC_INIT(0); +static atomic_t mod_stuck = ATOMIC_INIT(0); +static atomic_t fifo_full = ATOMIC_INIT(0); +static struct shrm_dev *shm_dev; + +/* Spin lock and tasklet declaration */ +DECLARE_TASKLET(shm_ca_0_tasklet, shm_ca_msgpending_0_tasklet, 0); +DECLARE_TASKLET(shm_ca_1_tasklet, shm_ca_msgpending_1_tasklet, 0); +DECLARE_TASKLET(shm_ac_read_0_tasklet, shm_ac_read_notif_0_tasklet, 0); +DECLARE_TASKLET(shm_ac_read_1_tasklet, shm_ac_read_notif_1_tasklet, 0); + +static DEFINE_MUTEX(ac_state_mutex); + +static DEFINE_SPINLOCK(ca_common_lock); +static DEFINE_SPINLOCK(ca_audio_lock); +static DEFINE_SPINLOCK(ca_wake_req_lock); +static DEFINE_SPINLOCK(boot_lock); +static DEFINE_SPINLOCK(mod_stuck_lock); +static DEFINE_SPINLOCK(start_timer_lock); + +enum shrm_nl { + SHRM_NL_MOD_RESET = 1, + SHRM_NL_MOD_QUERY_STATE, + SHRM_NL_USER_MOD_RESET, + SHRM_NL_STATUS_MOD_ONLINE, + SHRM_NL_STATUS_MOD_OFFLINE, +}; + +static int check_modem_in_reset(void); + +void shm_print_dbg_info_work(struct kthread_work *work) +{ + abx500_dump_all_banks(); + prcmu_debug_dump_regs(); + prcmu_debug_dump_data_mem(); +} + +void shm_mod_reset_req_work(struct kthread_work *work) +{ + unsigned long flags; + + /* update the boot_state */ + spin_lock_irqsave(&boot_lock, flags); + if (boot_state != BOOT_DONE) { + dev_info(shm_dev->dev, "Modem in reset state\n"); + spin_unlock_irqrestore(&boot_lock, flags); + return; + } + boot_state = BOOT_UNKNOWN; + wmb(); + spin_unlock_irqrestore(&boot_lock, flags); + prcmu_modem_reset(); +} + +static void shm_ac_sleep_req_work(struct kthread_work *work) +{ + mutex_lock(&ac_state_mutex); + if (atomic_read(&ac_sleep_disable_count) == 0) + modem_release(shm_dev->modem); + mutex_unlock(&ac_state_mutex); +} + +static void shm_ac_wake_req_work(struct kthread_work *work) +{ + mutex_lock(&ac_state_mutex); + modem_request(shm_dev->modem); + mutex_unlock(&ac_state_mutex); +} + +static u32 get_host_accessport_val(void) +{ + u32 prcm_hostaccess; + u32 status; + u32 reset_stats; + + status = (prcmu_read(PRCM_MOD_AWAKE_STATUS) & 0x03); + reset_stats = (prcmu_read(PRCM_MOD_RESETN_VAL) & 0x03); + prcm_hostaccess = prcmu_read(PRCM_HOSTACCESS_REQ); + wmb(); + prcm_hostaccess = ((prcm_hostaccess & 0x01) && + (status == (PRCM_MOD_AWAKE_STATUS_PRCM_MOD_AAPD_AWAKE | + PRCM_MOD_AWAKE_STATUS_PRCM_MOD_COREPD_AWAKE)) && + (reset_stats == (PRCM_MOD_SW_RESET | PRCM_MOD_PURESET))); + + return prcm_hostaccess; +} + +static enum hrtimer_restart shm_fifo_full_timeout(struct hrtimer *timer) +{ + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_print_dbg_info); + return HRTIMER_NORESTART; +} + +static enum hrtimer_restart shm_mod_stuck_timeout(struct hrtimer *timer) +{ + unsigned long flags; + + spin_lock_irqsave(&mod_stuck_lock, flags); + /* Check MSR is already in progress */ + if (shm_dev->msr_flag || boot_state == BOOT_UNKNOWN || + atomic_read(&mod_stuck) || atomic_read(&fifo_full)) { + spin_unlock_irqrestore(&mod_stuck_lock, flags); + return HRTIMER_NORESTART; + } + atomic_set(&mod_stuck, 1); + spin_unlock_irqrestore(&mod_stuck_lock, flags); + dev_err(shm_dev->dev, "No response from modem, timeout %dsec\n", + MOD_STUCK_TIMEOUT); + dev_err(shm_dev->dev, "APE initiating MSR\n"); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_print_dbg_info); + return HRTIMER_NORESTART; +} + +static enum hrtimer_restart callback(struct hrtimer *timer) +{ + unsigned long flags; + + spin_lock_irqsave(&ca_wake_req_lock, flags); + if (((shrm_common_rx_state == SHRM_IDLE) || + (shrm_common_rx_state == SHRM_SLEEP_STATE)) + && ((shrm_common_tx_state == SHRM_IDLE) || + (shrm_common_tx_state == SHRM_SLEEP_STATE)) + && ((shrm_audio_rx_state == SHRM_IDLE) || + (shrm_audio_rx_state == SHRM_SLEEP_STATE)) + && ((shrm_audio_tx_state == SHRM_IDLE) || + (shrm_audio_tx_state == SHRM_SLEEP_STATE))) { + + shrm_common_rx_state = SHRM_SLEEP_STATE; + shrm_audio_rx_state = SHRM_SLEEP_STATE; + shrm_common_tx_state = SHRM_SLEEP_STATE; + shrm_audio_tx_state = SHRM_SLEEP_STATE; + + queue_kthread_work(&shm_dev->shm_ac_sleep_kw, + &shm_dev->shm_ac_sleep_req); + + } + spin_unlock_irqrestore(&ca_wake_req_lock, flags); + + return HRTIMER_NORESTART; +} + +int nl_send_multicast_message(int msg, gfp_t gfp_mask) +{ + struct sk_buff *skb = NULL; + struct nlmsghdr *nlh = NULL; + int err; + + /* prepare netlink message */ + skb = alloc_skb(NLMSG_SPACE(MAX_PAYLOAD), gfp_mask); + if (!skb) { + dev_err(shm_dev->dev, "%s:alloc_skb failed\n", __func__); + err = -ENOMEM; + goto out; + } + + nlh = (struct nlmsghdr *)skb->data; + nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD); + dev_dbg(shm_dev->dev, "nlh->nlmsg_len = %d\n", nlh->nlmsg_len); + + nlh->nlmsg_pid = 0; /* from kernel */ + nlh->nlmsg_flags = 0; + *(int *)NLMSG_DATA(nlh) = msg; + skb_put(skb, MAX_PAYLOAD); + /* sender is in group 1<<0 */ + NETLINK_CB(skb).pid = 0; /* from kernel */ + /* to mcast group 1<<0 */ + NETLINK_CB(skb).dst_group = 1; + + /*multicast the message to all listening processes*/ + err = netlink_broadcast(shrm_nl_sk, skb, 0, 1, gfp_mask); + dev_dbg(shm_dev->dev, "ret val from nl-multicast = %d\n", err); + +out: + return err; +} + +static void nl_send_unicast_message(int dst_pid) +{ + struct sk_buff *skb = NULL; + struct nlmsghdr *nlh = NULL; + int err; + int bt_state; + unsigned long flags; + + dev_info(shm_dev->dev, "Sending unicast message\n"); + + /* prepare the NL message for unicast */ + skb = alloc_skb(NLMSG_SPACE(MAX_PAYLOAD), GFP_KERNEL); + if (!skb) { + dev_err(shm_dev->dev, "%s:alloc_skb failed\n", __func__); + return; + } + + nlh = (struct nlmsghdr *)skb->data; + nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD); + dev_dbg(shm_dev->dev, "nlh->nlmsg_len = %d\n", nlh->nlmsg_len); + + nlh->nlmsg_pid = 0; /* from kernel */ + nlh->nlmsg_flags = 0; + + spin_lock_irqsave(&boot_lock, flags); + bt_state = boot_state; + spin_unlock_irqrestore(&boot_lock, flags); + + if (bt_state == BOOT_DONE) + *(int *)NLMSG_DATA(nlh) = SHRM_NL_STATUS_MOD_ONLINE; + else + *(int *)NLMSG_DATA(nlh) = SHRM_NL_STATUS_MOD_OFFLINE; + + skb_put(skb, MAX_PAYLOAD); + /* sender is in group 1<<0 */ + NETLINK_CB(skb).pid = 0; /* from kernel */ + NETLINK_CB(skb).dst_group = 0; + + /*unicast the message to the querying processes*/ + err = netlink_unicast(shrm_nl_sk, skb, dst_pid, MSG_DONTWAIT); + dev_dbg(shm_dev->dev, "ret val from nl-unicast = %d\n", err); +} + + +static int check_modem_in_reset(void) +{ + u8 bt_state; + unsigned long flags; + + spin_lock_irqsave(&boot_lock, flags); + bt_state = boot_state; + spin_unlock_irqrestore(&boot_lock, flags); + +#ifdef CONFIG_U8500_SHRM_MODEM_SILENT_RESET + if (bt_state != BOOT_UNKNOWN) + return 0; + else + return -ENODEV; +#else + /* + * this check won't be applicable and won't work correctly + * if modem-silent-feature is not enabled + * so, simply return 0 + */ + return 0; +#endif +} + +void shm_ca_msgpending_0_tasklet(unsigned long tasklet_data) +{ + struct shrm_dev *shrm = (struct shrm_dev *)tasklet_data; + u32 reader_local_rptr; + u32 reader_local_wptr; + u32 shared_rptr; + u32 config = 0, version = 0; + unsigned long flags; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + /* Interprocess locking */ + spin_lock(&ca_common_lock); + + /* Update_reader_local_wptr with shared_wptr */ + update_ca_common_local_wptr(shrm); + get_reader_pointers(COMMON_CHANNEL, &reader_local_rptr, + &reader_local_wptr, &shared_rptr); + + set_ca_msg_0_read_notif_send(0); + + if (boot_state == BOOT_DONE) { + shrm_common_rx_state = SHRM_PTR_FREE; + + if (reader_local_rptr != shared_rptr) + ca_msg_read_notification_0(shrm); + if (reader_local_rptr != reader_local_wptr) + receive_messages_common(shrm); + get_reader_pointers(COMMON_CHANNEL, &reader_local_rptr, + &reader_local_wptr, &shared_rptr); + if (reader_local_rptr == reader_local_wptr) + shrm_common_rx_state = SHRM_IDLE; + } else { + /* BOOT phase.only a BOOT_RESP should be in FIFO */ + if (boot_state != BOOT_INFO_SYNC) { + if (!read_boot_info_req(shrm, &config, &version)) { + dev_err(shrm->dev, + "Unable to read boot state\n"); + return; + } + /* SendReadNotification */ + ca_msg_read_notification_0(shrm); + /* + * Check the version number before + * sending Boot info response + */ + + /* send MsgPending notification */ + write_boot_info_resp(shrm, config, version); + spin_lock_irqsave(&boot_lock, flags); + boot_state = BOOT_INFO_SYNC; + spin_unlock_irqrestore(&boot_lock, flags); + dev_info(shrm->dev, "BOOT_INFO_SYNC\n"); + queue_kthread_work(&shrm->shm_common_ch_wr_kw, + &shrm->send_ac_msg_pend_notify_0); + } else { + ca_msg_read_notification_0(shrm); + dev_info(shrm->dev, + "BOOT_INFO_SYNC\n"); + } + } + /* Interprocess locking */ + spin_unlock(&ca_common_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void shm_ca_msgpending_1_tasklet(unsigned long tasklet_data) +{ + struct shrm_dev *shrm = (struct shrm_dev *)tasklet_data; + u32 reader_local_rptr; + u32 reader_local_wptr; + u32 shared_rptr; + + /* + * This function is called when CaMsgPendingNotification Trigerred + * by CMU. It means that CMU has wrote a message into Ca Audio FIFO + */ + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown\n", + __func__); + return; + } + + /* Interprocess locking */ + spin_lock(&ca_audio_lock); + + /* Update_reader_local_wptr(with shared_wptr) */ + update_ca_audio_local_wptr(shrm); + get_reader_pointers(AUDIO_CHANNEL, &reader_local_rptr, + &reader_local_wptr, &shared_rptr); + + set_ca_msg_1_read_notif_send(0); + + if (boot_state != BOOT_DONE) { + dev_err(shrm->dev, "Boot Error\n"); + return; + } + shrm_audio_rx_state = SHRM_PTR_FREE; + /* Check we already read the message */ + if (reader_local_rptr != shared_rptr) + ca_msg_read_notification_1(shrm); + if (reader_local_rptr != reader_local_wptr) + receive_messages_audio(shrm); + + get_reader_pointers(AUDIO_CHANNEL, &reader_local_rptr, + &reader_local_wptr, &shared_rptr); + if (reader_local_rptr == reader_local_wptr) + shrm_audio_rx_state = SHRM_IDLE; + + /* Interprocess locking */ + spin_unlock(&ca_audio_lock); + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void shm_ac_read_notif_0_tasklet(unsigned long tasklet_data) +{ + struct shrm_dev *shrm = (struct shrm_dev *)tasklet_data; + u32 writer_local_rptr; + u32 writer_local_wptr; + u32 shared_wptr; + unsigned long flags; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + /* Update writer_local_rptrwith shared_rptr */ + update_ac_common_local_rptr(shrm); + get_writer_pointers(COMMON_CHANNEL, &writer_local_rptr, + &writer_local_wptr, &shared_wptr); + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown\n", + __func__); + return; + } + + if (boot_state == BOOT_INFO_SYNC) { + /* BOOT_RESP sent by APE has been received by CMT */ + spin_lock_irqsave(&boot_lock, flags); + boot_state = BOOT_DONE; + spin_unlock_irqrestore(&boot_lock, flags); + dev_info(shrm->dev, "IPC_ISA BOOT_DONE\n"); + + if (shrm->msr_flag) { + shrm_start_netdev(shrm->ndev); + shrm->msr_flag = 0; + + /* multicast that modem is online */ + nl_send_multicast_message(SHRM_NL_STATUS_MOD_ONLINE, + GFP_ATOMIC); + } + + } else if (boot_state == BOOT_DONE) { + if (writer_local_rptr != writer_local_wptr) { + shrm_common_tx_state = SHRM_PTR_FREE; + queue_kthread_work(&shrm->shm_common_ch_wr_kw, + &shrm->send_ac_msg_pend_notify_0); + } else { + shrm_common_tx_state = SHRM_IDLE; + shrm_restart_netdev(shrm->ndev); + } + } else { + dev_err(shrm->dev, "Invalid boot state\n"); + } + /* start timer here */ + hrtimer_start(&timer, ktime_set(0, 25*NSEC_PER_MSEC), + HRTIMER_MODE_REL); + atomic_dec(&ac_sleep_disable_count); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void shm_ac_read_notif_1_tasklet(unsigned long tasklet_data) +{ + struct shrm_dev *shrm = (struct shrm_dev *)tasklet_data; + u32 writer_local_rptr; + u32 writer_local_wptr; + u32 shared_wptr; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown\n", + __func__); + return; + } + + /* Update writer_local_rptr(with shared_rptr) */ + update_ac_audio_local_rptr(shrm); + get_writer_pointers(AUDIO_CHANNEL, &writer_local_rptr, + &writer_local_wptr, &shared_wptr); + if (boot_state != BOOT_DONE) { + dev_err(shrm->dev, "Error Case in boot state\n"); + return; + } + if (writer_local_rptr != writer_local_wptr) { + shrm_audio_tx_state = SHRM_PTR_FREE; + queue_kthread_work(&shrm->shm_audio_ch_wr_kw, + &shrm->send_ac_msg_pend_notify_1); + } else { + shrm_audio_tx_state = SHRM_IDLE; + } + /* start timer here */ + hrtimer_start(&timer, ktime_set(0, 25*NSEC_PER_MSEC), + HRTIMER_MODE_REL); + atomic_dec(&ac_sleep_disable_count); + atomic_dec(&ac_msg_pend_1); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void shm_ca_sleep_req_work(struct kthread_work *work) +{ + u8 bt_state; + unsigned long flags; + + dev_dbg(shm_dev->dev, "%s:IRQ_PRCMU_CA_SLEEP\n", __func__); + + spin_lock_irqsave(&boot_lock, flags); + bt_state = boot_state; + spin_unlock_irqrestore(&boot_lock, flags); + + local_irq_save(flags); + preempt_disable(); + if (bt_state != BOOT_DONE) { + dev_err(shm_dev->dev, "%s:Modem state reset or unknown\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return; + } + shrm_common_rx_state = SHRM_IDLE; + shrm_audio_rx_state = SHRM_IDLE; + + if (!get_host_accessport_val()) { + dev_err(shm_dev->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return; + } + writel((1<<GOP_CA_WAKE_ACK_BIT), + shm_dev->intr_base + GOP_SET_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + + hrtimer_start(&timer, ktime_set(0, 10*NSEC_PER_MSEC), + HRTIMER_MODE_REL); + suspend_unblock_sleep(); + atomic_dec(&ac_sleep_disable_count); +} + +void shm_ca_wake_req_work(struct kthread_work *work) +{ + unsigned long flags; + struct shrm_dev *shrm = container_of(work, + struct shrm_dev, shm_ca_wake_req); + + /* initialize the FIFO Variables */ + if (boot_state == BOOT_INIT) + shm_fifo_init(shrm); + + mutex_lock(&ac_state_mutex); + modem_request(shrm->modem); + mutex_unlock(&ac_state_mutex); + + local_irq_save(flags); + preempt_disable(); + /* send ca_wake_ack_interrupt to CMU */ + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + } + + /* send ca_wake_ack_interrupt to CMU */ + writel((1<<GOP_CA_WAKE_ACK_BIT), + shm_dev->intr_base + GOP_SET_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); +} +#ifdef CONFIG_U8500_SHRM_MODEM_SILENT_RESET +static int shrm_modem_reset_sequence(void) +{ + int err; + unsigned long flags; + + hrtimer_cancel(&timer); + hrtimer_cancel(&mod_stuck_timer_0); + hrtimer_cancel(&mod_stuck_timer_1); + hrtimer_cancel(&fifo_full_timer); + atomic_set(&mod_stuck, 0); + atomic_set(&fifo_full, 0); + tasklet_disable_nosync(&shm_ac_read_0_tasklet); + tasklet_disable_nosync(&shm_ac_read_1_tasklet); + tasklet_disable_nosync(&shm_ca_0_tasklet); + tasklet_disable_nosync(&shm_ca_1_tasklet); + + /* + * keep the count to 0 so that we can bring down the line + * for normal ac-wake and ac-sleep logic + */ + atomic_set(&ac_sleep_disable_count, 0); + atomic_set(&ac_msg_pend_1, 0); + + /* workaround for MSR */ + queue_kthread_work(&shm_dev->shm_ac_wake_kw, + &shm_dev->shm_ac_wake_req); + + /* reset char device queues */ + shrm_char_reset_queues(shm_dev); + + /* reset protocol states */ + shrm_common_tx_state = SHRM_SLEEP_STATE; + shrm_common_rx_state = SHRM_SLEEP_STATE; + shrm_audio_tx_state = SHRM_SLEEP_STATE; + shrm_audio_rx_state = SHRM_SLEEP_STATE; + + /* set the msr flag */ + shm_dev->msr_flag = 1; + + /* multicast that modem is going to reset */ + err = nl_send_multicast_message(SHRM_NL_MOD_RESET, GFP_ATOMIC); + + /* reset the boot state */ + spin_lock_irqsave(&boot_lock, flags); + boot_state = BOOT_INIT; + spin_unlock_irqrestore(&boot_lock, flags); + + tasklet_enable(&shm_ac_read_0_tasklet); + tasklet_enable(&shm_ac_read_1_tasklet); + tasklet_enable(&shm_ca_0_tasklet); + tasklet_enable(&shm_ca_1_tasklet); + /* re-enable irqs */ + enable_irq(shm_dev->ac_read_notif_0_irq); + enable_irq(shm_dev->ac_read_notif_1_irq); + enable_irq(shm_dev->ca_msg_pending_notif_0_irq); + enable_irq(shm_dev->ca_msg_pending_notif_1_irq); + enable_irq(IRQ_PRCMU_CA_WAKE); + enable_irq(IRQ_PRCMU_CA_SLEEP); + + return err; +} +#endif + +static void shrm_modem_reset_callback(unsigned long irq) +{ + dev_err(shm_dev->dev, "Received mod_reset_req interrupt\n"); + +#ifdef CONFIG_U8500_SHRM_MODEM_SILENT_RESET + { + int err; + dev_info(shm_dev->dev, "Initiating Modem silent reset\n"); + + err = shrm_modem_reset_sequence(); + if (err) + dev_err(shm_dev->dev, + "Failed multicast of modem reset\n"); + } +#else + dev_info(shm_dev->dev, "Modem in reset loop, doing System reset\n"); + + /* Call the PRCMU reset API */ + prcmu_system_reset(SW_RESET_NO_ARGUMENT); +#endif +} + +DECLARE_TASKLET(shrm_sw_reset_callback, shrm_modem_reset_callback, + IRQ_PRCMU_MODEM_SW_RESET_REQ); + +static irqreturn_t shrm_prcmu_irq_handler(int irq, void *data) +{ + struct shrm_dev *shrm = data; + unsigned long flags; + + switch (irq) { + case IRQ_PRCMU_CA_WAKE: + suspend_block_sleep(); + if (shrm->msr_flag) + atomic_set(&ac_sleep_disable_count, 0); + atomic_inc(&ac_sleep_disable_count); + queue_kthread_work(&shrm->shm_ca_wake_kw, &shrm->shm_ca_wake_req); + break; + case IRQ_PRCMU_CA_SLEEP: + queue_kthread_work(&shrm->shm_ca_wake_kw, &shrm->shm_ca_sleep_req); + break; + case IRQ_PRCMU_MODEM_SW_RESET_REQ: + /* update the boot_state */ + spin_lock_irqsave(&boot_lock, flags); + boot_state = BOOT_UNKNOWN; + + /* + * put a barrier over here to make sure boot_state is updated + * else, it is seen that some of already executing modem + * irqs or tasklets fail the protocol checks and will ultimately + * try to acces the modem causing system to hang. + * This is particularly seen with user-space initiated modem reset + */ + wmb(); + spin_unlock_irqrestore(&boot_lock, flags); + + disable_irq_nosync(shrm->ac_read_notif_0_irq); + disable_irq_nosync(shrm->ac_read_notif_1_irq); + disable_irq_nosync(shrm->ca_msg_pending_notif_0_irq); + disable_irq_nosync(shrm->ca_msg_pending_notif_1_irq); + disable_irq_nosync(IRQ_PRCMU_CA_WAKE); + disable_irq_nosync(IRQ_PRCMU_CA_SLEEP); + + /* stop network queue */ + shrm_stop_netdev(shm_dev->ndev); + + tasklet_schedule(&shrm_sw_reset_callback); + break; + default: + dev_err(shrm->dev, "%s: => IRQ %d\n", __func__, irq); + return IRQ_NONE; + } + return IRQ_HANDLED; +} + +static void send_ac_msg_pend_notify_0_work(struct kthread_work *work) +{ + unsigned long flags; + struct shrm_dev *shrm = container_of(work, struct shrm_dev, + send_ac_msg_pend_notify_0); + + dev_dbg(shrm->dev, "%s IN\n", __func__); + update_ac_common_shared_wptr(shrm); + + mutex_lock(&ac_state_mutex); + atomic_inc(&ac_sleep_disable_count); + modem_request(shrm->modem); + mutex_unlock(&ac_state_mutex); + + spin_lock_irqsave(&start_timer_lock, flags); + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + spin_unlock_irqrestore(&start_timer_lock, flags); + return; + } + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + spin_unlock_irqrestore(&start_timer_lock, flags); + return; + } + + /* Trigger AcMsgPendingNotification to CMU */ + writel((1<<GOP_COMMON_AC_MSG_PENDING_NOTIFICATION_BIT), + shrm->intr_base + GOP_SET_REGISTER_BASE); + + /* timer to detect modem stuck or hang */ + hrtimer_start(&mod_stuck_timer_0, ktime_set(MOD_STUCK_TIMEOUT, 0), + HRTIMER_MODE_REL); + spin_unlock_irqrestore(&start_timer_lock, flags); + if (shrm_common_tx_state == SHRM_PTR_FREE) + shrm_common_tx_state = SHRM_PTR_BUSY; + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +static void send_ac_msg_pend_notify_1_work(struct kthread_work *work) +{ + unsigned long flags; + struct shrm_dev *shrm = container_of(work, struct shrm_dev, + send_ac_msg_pend_notify_1); + + dev_dbg(shrm->dev, "%s IN\n", __func__); + /* Update shared_wptr with writer_local_wptr) */ + update_ac_audio_shared_wptr(shrm); + + mutex_lock(&ac_state_mutex); + if (!atomic_read(&ac_msg_pend_1)) { + atomic_inc(&ac_sleep_disable_count); + atomic_inc(&ac_msg_pend_1); + } + modem_request(shrm->modem); + mutex_unlock(&ac_state_mutex); + + spin_lock_irqsave(&start_timer_lock, flags); + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + spin_unlock_irqrestore(&start_timer_lock, flags); + return; + } + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + spin_unlock_irqrestore(&start_timer_lock, flags); + return; + } + + /* Trigger AcMsgPendingNotification to CMU */ + writel((1<<GOP_AUDIO_AC_MSG_PENDING_NOTIFICATION_BIT), + shrm->intr_base + GOP_SET_REGISTER_BASE); + + /* timer to detect modem stuck or hang */ + hrtimer_start(&mod_stuck_timer_1, ktime_set(MOD_STUCK_TIMEOUT, 0), + HRTIMER_MODE_REL); + spin_unlock_irqrestore(&start_timer_lock, flags); + if (shrm_audio_tx_state == SHRM_PTR_FREE) + shrm_audio_tx_state = SHRM_PTR_BUSY; + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void shm_nl_receive(struct sk_buff *skb) +{ + struct nlmsghdr *nlh = NULL; + int msg; + + dev_dbg(shm_dev->dev, "Received NL msg from user-space\n"); + + nlh = (struct nlmsghdr *)skb->data; + msg = *((int *)(NLMSG_DATA(nlh))); + switch (msg) { + case SHRM_NL_MOD_QUERY_STATE: + dev_info(shm_dev->dev, "mod-query-state from user-space\n"); + nl_send_unicast_message(nlh->nlmsg_pid); + break; + + case SHRM_NL_USER_MOD_RESET: + dev_info(shm_dev->dev, "user-space inited mod-reset-req\n"); + dev_info(shm_dev->dev, "PCRMU resets modem\n"); + if (atomic_read(&mod_stuck) || atomic_read(&fifo_full)) { + dev_info(shm_dev->dev, + "Modem reset already in progress\n"); + break; + } + atomic_set(&mod_stuck, 1); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + break; + + default: + dev_err(shm_dev->dev, "Invalid NL msg from user-space\n"); + break; + }; +} + +int shrm_protocol_init(struct shrm_dev *shrm, + received_msg_handler common_rx_handler, + received_msg_handler audio_rx_handler) +{ + int err; + struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; + + shm_dev = shrm; + boot_state = BOOT_INIT; + dev_info(shrm->dev, "IPC_ISA BOOT_INIT\n"); + rx_common_handler = common_rx_handler; + rx_audio_handler = audio_rx_handler; + atomic_set(&ac_sleep_disable_count, 0); + + hrtimer_init(&timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + timer.function = callback; + hrtimer_init(&mod_stuck_timer_0, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + mod_stuck_timer_0.function = shm_mod_stuck_timeout; + hrtimer_init(&mod_stuck_timer_1, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + mod_stuck_timer_1.function = shm_mod_stuck_timeout; + hrtimer_init(&fifo_full_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + fifo_full_timer.function = shm_fifo_full_timeout; + + init_kthread_worker(&shrm->shm_common_ch_wr_kw); + shrm->shm_common_ch_wr_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_common_ch_wr_kw, + "shm_common_channel_irq"); + if (IS_ERR(shrm->shm_common_ch_wr_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + return -ENOMEM; + } + + init_kthread_worker(&shrm->shm_audio_ch_wr_kw); + shrm->shm_audio_ch_wr_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_audio_ch_wr_kw, + "shm_audio_channel_irq"); + if (IS_ERR(shrm->shm_audio_ch_wr_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + err = -ENOMEM; + goto free_kw1; + } + /* must use the FIFO scheduler as it is realtime sensitive */ + sched_setscheduler(shrm->shm_audio_ch_wr_kw_task, SCHED_FIFO, ¶m); + + init_kthread_worker(&shrm->shm_ac_wake_kw); + shrm->shm_ac_wake_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_ac_wake_kw, + "shm_ac_wake_req"); + if (IS_ERR(shrm->shm_ac_wake_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + err = -ENOMEM; + goto free_kw2; + } + /* must use the FIFO scheduler as it is realtime sensitive */ + sched_setscheduler(shrm->shm_ac_wake_kw_task, SCHED_FIFO, ¶m); + + init_kthread_worker(&shrm->shm_ca_wake_kw); + shrm->shm_ca_wake_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_ca_wake_kw, + "shm_ca_wake_req"); + if (IS_ERR(shrm->shm_ca_wake_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + err = -ENOMEM; + goto free_kw3; + } + /* must use the FIFO scheduler as it is realtime sensitive */ + sched_setscheduler(shrm->shm_ca_wake_kw_task, SCHED_FIFO, ¶m); + + init_kthread_worker(&shrm->shm_ac_sleep_kw); + shrm->shm_ac_sleep_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_ac_sleep_kw, + "shm_ac_sleep_req"); + if (IS_ERR(shrm->shm_ac_sleep_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + err = -ENOMEM; + goto free_kw4; + } + init_kthread_worker(&shrm->shm_mod_stuck_kw); + shrm->shm_mod_stuck_kw_task = kthread_run(kthread_worker_fn, + &shrm->shm_mod_stuck_kw, + "shm_mod_reset_req"); + if (IS_ERR(shrm->shm_mod_stuck_kw_task)) { + dev_err(shrm->dev, "failed to create work task\n"); + err = -ENOMEM; + goto free_kw5; + } + + init_kthread_work(&shrm->send_ac_msg_pend_notify_0, + send_ac_msg_pend_notify_0_work); + init_kthread_work(&shrm->send_ac_msg_pend_notify_1, + send_ac_msg_pend_notify_1_work); + init_kthread_work(&shrm->shm_ca_wake_req, shm_ca_wake_req_work); + init_kthread_work(&shrm->shm_ca_sleep_req, shm_ca_sleep_req_work); + init_kthread_work(&shrm->shm_ac_sleep_req, shm_ac_sleep_req_work); + init_kthread_work(&shrm->shm_ac_wake_req, shm_ac_wake_req_work); + init_kthread_work(&shrm->shm_mod_reset_req, shm_mod_reset_req_work); + init_kthread_work(&shrm->shm_print_dbg_info, shm_print_dbg_info_work); + + /* set tasklet data */ + shm_ca_0_tasklet.data = (unsigned long)shrm; + shm_ca_1_tasklet.data = (unsigned long)shrm; + + err = request_irq(IRQ_PRCMU_CA_SLEEP, shrm_prcmu_irq_handler, + IRQF_NO_SUSPEND, "ca-sleep", shrm); + if (err < 0) { + dev_err(shm_dev->dev, "Failed alloc IRQ_PRCMU_CA_SLEEP.\n"); + goto free_kw6; + } + + err = request_irq(IRQ_PRCMU_CA_WAKE, shrm_prcmu_irq_handler, + IRQF_NO_SUSPEND, "ca-wake", shrm); + if (err < 0) { + dev_err(shm_dev->dev, "Failed alloc IRQ_PRCMU_CA_WAKE.\n"); + goto drop2; + } + + err = request_irq(IRQ_PRCMU_MODEM_SW_RESET_REQ, shrm_prcmu_irq_handler, + IRQF_NO_SUSPEND, "modem-sw-reset-req", shrm); + if (err < 0) { + dev_err(shm_dev->dev, + "Failed alloc IRQ_PRCMU_MODEM_SW_RESET_REQ.\n"); + goto drop1; + } + +#ifdef CONFIG_U8500_SHRM_MODEM_SILENT_RESET + /* init netlink socket for user-space communication */ + shrm_nl_sk = netlink_kernel_create(NULL, NETLINK_SHRM, 1, + shm_nl_receive, NULL, THIS_MODULE); + + if (!shrm_nl_sk) { + dev_err(shm_dev->dev, "netlink socket creation failed\n"); + goto drop; + } +#endif + return 0; + +#ifdef CONFIG_U8500_SHRM_MODEM_SILENT_RESET +drop: + free_irq(IRQ_PRCMU_MODEM_SW_RESET_REQ, NULL); +#endif +drop1: + free_irq(IRQ_PRCMU_CA_WAKE, NULL); +drop2: + free_irq(IRQ_PRCMU_CA_SLEEP, NULL); +free_kw6: + kthread_stop(shrm->shm_mod_stuck_kw_task); +free_kw5: + kthread_stop(shrm->shm_ac_sleep_kw_task); +free_kw4: + kthread_stop(shrm->shm_ca_wake_kw_task); +free_kw3: + kthread_stop(shrm->shm_ac_wake_kw_task); +free_kw2: + kthread_stop(shrm->shm_audio_ch_wr_kw_task); +free_kw1: + kthread_stop(shrm->shm_common_ch_wr_kw_task); + return err; +} + +void shrm_protocol_deinit(struct shrm_dev *shrm) +{ + free_irq(IRQ_PRCMU_CA_SLEEP, NULL); + free_irq(IRQ_PRCMU_CA_WAKE, NULL); + free_irq(IRQ_PRCMU_MODEM_SW_RESET_REQ, NULL); + flush_kthread_worker(&shrm->shm_common_ch_wr_kw); + flush_kthread_worker(&shrm->shm_audio_ch_wr_kw); + flush_kthread_worker(&shrm->shm_ac_wake_kw); + flush_kthread_worker(&shrm->shm_ca_wake_kw); + flush_kthread_worker(&shrm->shm_ac_sleep_kw); + flush_kthread_worker(&shrm->shm_mod_stuck_kw); + kthread_stop(shrm->shm_common_ch_wr_kw_task); + kthread_stop(shrm->shm_audio_ch_wr_kw_task); + kthread_stop(shrm->shm_ac_wake_kw_task); + kthread_stop(shrm->shm_ca_wake_kw_task); + kthread_stop(shrm->shm_ac_sleep_kw_task); + kthread_stop(shrm->shm_mod_stuck_kw_task); + modem_put(shrm->modem); +} + +int get_ca_wake_req_state(void) +{ + return ((atomic_read(&ac_sleep_disable_count) > 0) || + modem_get_usage(shm_dev->modem)); +} + +irqreturn_t ca_wake_irq_handler(int irq, void *ctrlr) +{ + struct shrm_dev *shrm = ctrlr; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + /* initialize the FIFO Variables */ + if (boot_state == BOOT_INIT) + shm_fifo_init(shrm); + + dev_dbg(shrm->dev, "Inside ca_wake_irq_handler\n"); + + /* Clear the interrupt */ + writel((1 << GOP_CA_WAKE_REQ_BIT), + shrm->intr_base + GOP_CLEAR_REGISTER_BASE); + + /* send ca_wake_ack_interrupt to CMU */ + writel((1 << GOP_CA_WAKE_ACK_BIT), + shrm->intr_base + GOP_SET_REGISTER_BASE); + + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return IRQ_HANDLED; +} + + +irqreturn_t ac_read_notif_0_irq_handler(int irq, void *ctrlr) +{ + unsigned long flags; + struct shrm_dev *shrm = ctrlr; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + /* Cancel the modem stuck timer */ + spin_lock_irqsave(&start_timer_lock, flags); + hrtimer_cancel(&mod_stuck_timer_0); + spin_unlock_irqrestore(&start_timer_lock, flags); + if (atomic_read(&fifo_full)) { + atomic_set(&fifo_full, 0); + hrtimer_cancel(&fifo_full_timer); + } + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return IRQ_HANDLED; + } + + shm_ac_read_0_tasklet.data = (unsigned long)shrm; + tasklet_schedule(&shm_ac_read_0_tasklet); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + /* Clear the interrupt */ + writel((1 << GOP_COMMON_AC_READ_NOTIFICATION_BIT), + shrm->intr_base + GOP_CLEAR_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return IRQ_HANDLED; +} + +irqreturn_t ac_read_notif_1_irq_handler(int irq, void *ctrlr) +{ + unsigned long flags; + struct shrm_dev *shrm = ctrlr; + + dev_dbg(shrm->dev, "%s IN+\n", __func__); + /* Cancel the modem stuck timer */ + spin_lock_irqsave(&start_timer_lock, flags); + hrtimer_cancel(&mod_stuck_timer_1); + spin_unlock_irqrestore(&start_timer_lock, flags); + if (atomic_read(&fifo_full)) { + atomic_set(&fifo_full, 0); + hrtimer_cancel(&fifo_full_timer); + } + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return IRQ_HANDLED; + } + + shm_ac_read_1_tasklet.data = (unsigned long)shrm; + tasklet_schedule(&shm_ac_read_1_tasklet); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + /* Clear the interrupt */ + writel((1 << GOP_AUDIO_AC_READ_NOTIFICATION_BIT), + shrm->intr_base + GOP_CLEAR_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return IRQ_HANDLED; +} + +irqreturn_t ca_msg_pending_notif_0_irq_handler(int irq, void *ctrlr) +{ + unsigned long flags; + struct shrm_dev *shrm = ctrlr; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return IRQ_HANDLED; + } + + tasklet_schedule(&shm_ca_0_tasklet); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + /* Clear the interrupt */ + writel((1 << GOP_COMMON_CA_MSG_PENDING_NOTIFICATION_BIT), + shrm->intr_base + GOP_CLEAR_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return IRQ_HANDLED; +} + +irqreturn_t ca_msg_pending_notif_1_irq_handler(int irq, void *ctrlr) +{ + unsigned long flags; + struct shrm_dev *shrm = ctrlr; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return IRQ_HANDLED; + } + + tasklet_schedule(&shm_ca_1_tasklet); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return IRQ_HANDLED; + } + /* Clear the interrupt */ + writel((1<<GOP_AUDIO_CA_MSG_PENDING_NOTIFICATION_BIT), + shrm->intr_base+GOP_CLEAR_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return IRQ_HANDLED; + +} + +/** + * shm_write_msg() - write message to shared memory + * @shrm: pointer to the shrm device information structure + * @l2_header: L2 header + * @addr: pointer to the message + * @length: length of the message to be written + * + * This function is called from net or char interface driver write operation. + * Prior to calling this function the message is copied from the user space + * buffer to the kernel buffer. This function based on the l2 header routes + * the message to the respective channel and FIFO. Then makes a call to the + * fifo write function where the message is written to the physical device. + */ +int shm_write_msg(struct shrm_dev *shrm, u8 l2_header, + void *addr, u32 length) +{ + u8 channel = 0; + int ret; + + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (boot_state != BOOT_DONE) { + dev_err(shrm->dev, + "error:after boot done call this fn, L2Header = %d\n", + l2_header); + ret = -ENODEV; + goto out; + } + + if ((l2_header == L2_HEADER_ISI) || + (l2_header == L2_HEADER_RPC) || + (l2_header == L2_HEADER_SECURITY) || + (l2_header == L2_HEADER_COMMON_SIMPLE_LOOPBACK) || + (l2_header == L2_HEADER_COMMON_ADVANCED_LOOPBACK) || + (l2_header == L2_HEADER_CIQ) || + (l2_header == L2_HEADER_RTC_CALIBRATION)) { + channel = 0; + if (shrm_common_tx_state == SHRM_SLEEP_STATE) + shrm_common_tx_state = SHRM_PTR_FREE; + else if (shrm_common_tx_state == SHRM_IDLE) + shrm_common_tx_state = SHRM_PTR_FREE; + + } else if ((l2_header == L2_HEADER_AUDIO) || + (l2_header == L2_HEADER_AUDIO_SIMPLE_LOOPBACK) || + (l2_header == L2_HEADER_AUDIO_ADVANCED_LOOPBACK)) { + if (shrm_audio_tx_state == SHRM_SLEEP_STATE) + shrm_audio_tx_state = SHRM_PTR_FREE; + else if (shrm_audio_tx_state == SHRM_IDLE) + shrm_audio_tx_state = SHRM_PTR_FREE; + + channel = 1; + } else { + ret = -ENODEV; + goto out; + } + ret = shm_write_msg_to_fifo(shrm, channel, l2_header, addr, length); + if (ret < 0) { + dev_err(shrm->dev, "write message to fifo failed\n"); + if (ret == -EAGAIN) { + if (!atomic_read(&fifo_full)) { + /* Start a timer so as to handle this gently */ + atomic_set(&fifo_full, 1); + hrtimer_start(&fifo_full_timer, ktime_set( + FIFO_FULL_TIMEOUT, 0), + HRTIMER_MODE_REL); + } + } + return ret; + } + /* + * notify only if new msg copied is the only unread one + * otherwise it means that reading process is ongoing + */ + if (is_the_only_one_unread_message(shrm, channel, length)) { + + /* Send Message Pending Noitication to CMT */ + if (channel == 0) + queue_kthread_work(&shrm->shm_common_ch_wr_kw, + &shrm->send_ac_msg_pend_notify_0); + else + queue_kthread_work(&shrm->shm_audio_ch_wr_kw, + &shrm->send_ac_msg_pend_notify_1); + + } + + dev_dbg(shrm->dev, "%s OUT\n", __func__); + return 0; + +out: + return ret; +} + +void ca_msg_read_notification_0(struct shrm_dev *shrm) +{ + unsigned long flags; + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (get_ca_msg_0_read_notif_send() == 0) { + update_ca_common_shared_rptr(shrm); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", + __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return; + } + /* Trigger CaMsgReadNotification to CMU */ + writel((1 << GOP_COMMON_CA_READ_NOTIFICATION_BIT), + shrm->intr_base + GOP_SET_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + set_ca_msg_0_read_notif_send(1); + shrm_common_rx_state = SHRM_PTR_BUSY; + } + + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +void ca_msg_read_notification_1(struct shrm_dev *shrm) +{ + unsigned long flags; + dev_dbg(shrm->dev, "%s IN\n", __func__); + + if (get_ca_msg_1_read_notif_send() == 0) { + update_ca_audio_shared_rptr(shrm); + + local_irq_save(flags); + preempt_disable(); + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + preempt_enable(); + local_irq_restore(flags); + return; + } + + if (!get_host_accessport_val()) { + dev_err(shrm->dev, "%s: host_accessport is low\n", + __func__); + queue_kthread_work(&shm_dev->shm_mod_stuck_kw, + &shm_dev->shm_mod_reset_req); + preempt_enable(); + local_irq_restore(flags); + return; + } + /* Trigger CaMsgReadNotification to CMU */ + writel((1<<GOP_AUDIO_CA_READ_NOTIFICATION_BIT), + shrm->intr_base+GOP_SET_REGISTER_BASE); + preempt_enable(); + local_irq_restore(flags); + set_ca_msg_1_read_notif_send(1); + shrm_audio_rx_state = SHRM_PTR_BUSY; + } + dev_dbg(shrm->dev, "%s OUT\n", __func__); +} + +/** + * receive_messages_common - receive common channnel msg from + * CMT(Cellular Mobile Terminal) + * @shrm: pointer to shrm device information structure + * + * The messages sent from CMT to APE are written to the respective FIFO + * and an interrupt is triggered by the CMT. This ca message pending + * interrupt calls this function. This function sends a read notification + * acknowledgement to the CMT and calls the common channel receive handler + * where the messsage is copied to the respective(ISI, RPC, SECURIT) queue + * based on the message l2 header. + */ +void receive_messages_common(struct shrm_dev *shrm) +{ + u8 l2_header; + u32 len; + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return; + } + + l2_header = read_one_l2msg_common(shrm, recieve_common_msg, &len); + /* Send Recieve_Call_back to Upper Layer */ + if (!rx_common_handler) { + dev_err(shrm->dev, "common_rx_handler is Null\n"); + BUG(); + } + (*rx_common_handler)(l2_header, &recieve_common_msg, len, + shrm); + /* SendReadNotification */ + ca_msg_read_notification_0(shrm); + + while (read_remaining_messages_common()) { + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return; + } + + l2_header = read_one_l2msg_common(shrm, recieve_common_msg, + &len); + /* Send Recieve_Call_back to Upper Layer */ + (*rx_common_handler)(l2_header, + &recieve_common_msg, len, + shrm); + } +} + +/** + * receive_messages_audio() - receive audio message from CMT + * @shrm: pointer to shrm device information structure + * + * The messages sent from CMT to APE are written to the respective FIFO + * and an interrupt is triggered by the CMT. This ca message pending + * interrupt calls this function. This function sends a read notification + * acknowledgement to the CMT and calls the common channel receive handler + * where the messsage is copied to the audio queue. + */ +void receive_messages_audio(struct shrm_dev *shrm) +{ + u8 l2_header; + u32 len; + + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return; + } + + l2_header = read_one_l2msg_audio(shrm, recieve_audio_msg, &len); + /* Send Recieve_Call_back to Upper Layer */ + + if (!rx_audio_handler) { + dev_crit(shrm->dev, "audio_rx_handler is Null\n"); + BUG(); + } + (*rx_audio_handler)(l2_header, &recieve_audio_msg, + len, shrm); + + /* SendReadNotification */ + ca_msg_read_notification_1(shrm); + while (read_remaining_messages_audio()) { + if (check_modem_in_reset()) { + dev_err(shrm->dev, "%s:Modem state reset or unknown.\n", + __func__); + return; + } + + l2_header = read_one_l2msg_audio(shrm, + recieve_audio_msg, &len); + /* Send Recieve_Call_back to Upper Layer */ + (*rx_audio_handler)(l2_header, + &recieve_audio_msg, len, + shrm); + } +} + +u8 get_boot_state() +{ + return boot_state; +} |