arch/arm/mach-msm/modem-8660.c - kernel/msm - Gitiles

 /* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/reboot.h>
 #include <linux/workqueue.h>
 #include <linux/io.h>
 #include <linux/jiffies.h>
 #include <linux/stringify.h>
 #include <linux/delay.h>
 #include <linux/module.h>

 #include <mach/irqs.h>
 #include <mach/scm.h>
 #include <mach/peripheral-loader.h>
 #include <mach/subsystem_restart.h>
 #include <mach/subsystem_notif.h>

 #include "smd_private.h"
 #include "modem_notifier.h"
 #include "ramdump.h"

 #define MODEM_HWIO_MSS_RESET_ADDR       0x00902C48
 #define MODULE_NAME			"modem_8660"
 #define MODEM_WDOG_ENABLE		0x10020008
 #define MODEM_CLEANUP_DELAY_MS		20

 #define SUBSYS_FATAL_DEBUG

 #if defined(SUBSYS_FATAL_DEBUG)
 static void debug_crash_modem_fn(struct work_struct *);
 static int reset_modem;
 static int ignore_smsm_ack;

 static DECLARE_DELAYED_WORK(debug_crash_modem_work,
 				debug_crash_modem_fn);

 module_param(reset_modem, int, 0644);
 #endif

 /* Subsystem restart: Modem data, functions */
 static void *modem_ramdump_dev;
 static void modem_fatal_fn(struct work_struct *);
 static void modem_unlock_timeout(struct work_struct *work);
 static int modem_notif_handler(struct notifier_block *this,
 				unsigned long code,
 				void *_cmd);
 static DECLARE_WORK(modem_fatal_work, modem_fatal_fn);
 static DECLARE_DELAYED_WORK(modem_unlock_timeout_work,
 				modem_unlock_timeout);

 static struct notifier_block modem_notif_nb = {
 	.notifier_call = modem_notif_handler,
 };

 static void modem_unlock_timeout(struct work_struct *work)
 {
 	void __iomem *hwio_modem_reset_addr =
 			ioremap_nocache(MODEM_HWIO_MSS_RESET_ADDR, 8);
 	pr_crit("%s: Timeout waiting for modem to unlock.\n", MODULE_NAME);

 	/* Set MSS_MODEM_RESET to 0x0 since the unlock didn't work */
 	writel_relaxed(0x0, hwio_modem_reset_addr);
 	/* Write needs to go through before the modem is restarted. */
 	mb();
 	iounmap(hwio_modem_reset_addr);

 	subsystem_restart("modem");
 	enable_irq(MARM_WDOG_EXPIRED);
 }

 static void modem_fatal_fn(struct work_struct *work)
 {
 	uint32_t modem_state;
 	uint32_t panic_smsm_states = SMSM_RESET | SMSM_SYSTEM_DOWNLOAD;
 	uint32_t reset_smsm_states = SMSM_SYSTEM_REBOOT_USR |
 					SMSM_SYSTEM_PWRDWN_USR;

 	pr_err("%s: Watchdog bite received from modem!\n", MODULE_NAME);

 	modem_state = smsm_get_state(SMSM_MODEM_STATE);
 	pr_err("%s: Modem SMSM state = 0x%x!", MODULE_NAME, modem_state);

 	if (modem_state == 0 || modem_state & panic_smsm_states) {

 		subsystem_restart("modem");
 		enable_irq(MARM_WDOG_EXPIRED);

 	} else if (modem_state & reset_smsm_states) {

 		pr_err("%s: User-invoked system reset/powerdown.",
 			MODULE_NAME);
 		kernel_restart(NULL);

 	} else {

 		int ret;
 		void *hwio_modem_reset_addr =
 				ioremap_nocache(MODEM_HWIO_MSS_RESET_ADDR, 8);

 		pr_err("%s: Modem AHB locked up.\n", MODULE_NAME);
 		pr_err("%s: Trying to free up modem!\n", MODULE_NAME);

 		writel_relaxed(0x3, hwio_modem_reset_addr);

 		/* If we are still alive after 6 seconds (allowing for
 		 * the 5-second-delayed-panic-reboot), modem is either
 		 * still wedged or SMSM didn't come through. Force panic
 		 * in that case.
 		*/
 		ret = schedule_delayed_work(&modem_unlock_timeout_work,
 					msecs_to_jiffies(6000));

 		iounmap(hwio_modem_reset_addr);
 	}
 }

 static int modem_notif_handler(struct notifier_block *this,
 				unsigned long code,
 				void *_cmd)
 {
 	if (code == MODEM_NOTIFIER_START_RESET) {
 		if (ignore_smsm_ack) {
 			ignore_smsm_ack = 0;
 			goto out;
 		}
 		pr_err("%s: Modem error fatal'ed.", MODULE_NAME);
 		subsystem_restart("modem");
 	}
 out:
 	return NOTIFY_DONE;
 }

 static int modem_shutdown(const struct subsys_data *crashed_subsys)
 {
 	void __iomem *modem_wdog_addr;

 	/* If the modem didn't already crash, setting SMSM_RESET
 	 * here will help flush caches etc. The ignore_smsm_ack
 	 * flag is set to ignore the SMSM_RESET notification
 	 * that is generated due to the modem settings its own
 	 * SMSM_RESET bit in response to the apps setting the
 	 * apps SMSM_RESET bit.
 	 */
 	if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
 		ignore_smsm_ack = 1;
 		smsm_reset_modem(SMSM_RESET);
 	}

 	/* Disable the modem watchdog to allow clean modem bootup */
 	modem_wdog_addr = ioremap_nocache(MODEM_WDOG_ENABLE, 8);
 	writel_relaxed(0x0, modem_wdog_addr);

 	/*
 	 * The write above needs to go through before the modem is
 	 * powered up again (subsystem restart).
 	 */
 	mb();
 	iounmap(modem_wdog_addr);

 	/* Wait here to allow the modem to clean up caches etc. */
 	msleep(MODEM_CLEANUP_DELAY_MS);
 	pil_force_shutdown("modem");
 	disable_irq_nosync(MARM_WDOG_EXPIRED);


 	return 0;
 }

 static int modem_powerup(const struct subsys_data *crashed_subsys)
 {
 	int ret;

 	ret = pil_force_boot("modem");
 	enable_irq(MARM_WDOG_EXPIRED);

 	return ret;
 }

 /* FIXME: Get address, size from PIL */
 static struct ramdump_segment modem_segments[] = {
 	{0x42F00000, 0x46000000 - 0x42F00000} };

 static int modem_ramdump(int enable,
 				const struct subsys_data *crashed_subsys)
 {
 	if (enable)
 		return do_ramdump(modem_ramdump_dev, modem_segments,
 			ARRAY_SIZE(modem_segments));
 	else
 		return 0;
 }

 static void modem_crash_shutdown(
 				const struct subsys_data *crashed_subsys)
 {
 	/* If modem hasn't already crashed, send SMSM_RESET. */
 	if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
 		modem_unregister_notifier(&modem_notif_nb);
 		smsm_reset_modem(SMSM_RESET);
 	}

 	/* Wait to allow the modem to clean up caches etc. */
 	mdelay(5);
 }

 static irqreturn_t modem_wdog_bite_irq(int irq, void *dev_id)
 {
 	int ret;

 	ret = schedule_work(&modem_fatal_work);
 	disable_irq_nosync(MARM_WDOG_EXPIRED);

 	return IRQ_HANDLED;
 }

 static struct subsys_data subsys_8660_modem = {
 	.name = "modem",
 	.shutdown = modem_shutdown,
 	.powerup = modem_powerup,
 	.ramdump = modem_ramdump,
 	.crash_shutdown = modem_crash_shutdown
 };

 static int __init modem_8660_init(void)
 {
 	int ret;

 	/* Need to listen for SMSM_RESET always */
 	modem_register_notifier(&modem_notif_nb);

 #if defined(SUBSYS_FATAL_DEBUG)
 	schedule_delayed_work(&debug_crash_modem_work, msecs_to_jiffies(5000));
 #endif

 	ret = request_irq(MARM_WDOG_EXPIRED, modem_wdog_bite_irq,
 			IRQF_TRIGGER_RISING, "modem_wdog", NULL);

 	if (ret < 0) {
 		pr_err("%s: Unable to request MARM_WDOG_EXPIRED irq.",
 			__func__);
 		goto out;
 	}

 	modem_ramdump_dev = create_ramdump_device("modem");

 	if (!modem_ramdump_dev) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	ret = ssr_register_subsystem(&subsys_8660_modem);
 out:
 	return ret;
 }

 static void __exit modem_8660_exit(void)
 {
 	free_irq(MARM_WDOG_EXPIRED, NULL);
 }

 #ifdef SUBSYS_FATAL_DEBUG
 static void debug_crash_modem_fn(struct work_struct *work)
 {
 	if (reset_modem == 1)
 		smsm_reset_modem(SMSM_RESET);

 	reset_modem = 0;
 	schedule_delayed_work(&debug_crash_modem_work, msecs_to_jiffies(1000));
 }
 #endif

 module_init(modem_8660_init);
 module_exit(modem_8660_exit);
	/* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/interrupt.h>
	#include <linux/reboot.h>
	#include <linux/workqueue.h>
	#include <linux/io.h>
	#include <linux/jiffies.h>
	#include <linux/stringify.h>
	#include <linux/delay.h>
	#include <linux/module.h>

	#include <mach/irqs.h>
	#include <mach/scm.h>
	#include <mach/peripheral-loader.h>
	#include <mach/subsystem_restart.h>
	#include <mach/subsystem_notif.h>

	#include "smd_private.h"
	#include "modem_notifier.h"
	#include "ramdump.h"

	#define MODEM_HWIO_MSS_RESET_ADDR 0x00902C48
	#define MODULE_NAME "modem_8660"
	#define MODEM_WDOG_ENABLE 0x10020008
	#define MODEM_CLEANUP_DELAY_MS 20

	#define SUBSYS_FATAL_DEBUG

	#if defined(SUBSYS_FATAL_DEBUG)
	static void debug_crash_modem_fn(struct work_struct *);
	static int reset_modem;
	static int ignore_smsm_ack;

	static DECLARE_DELAYED_WORK(debug_crash_modem_work,
	debug_crash_modem_fn);

	module_param(reset_modem, int, 0644);
	#endif

	/* Subsystem restart: Modem data, functions */
	static void *modem_ramdump_dev;
	static void modem_fatal_fn(struct work_struct *);
	static void modem_unlock_timeout(struct work_struct *work);
	static int modem_notif_handler(struct notifier_block *this,
	unsigned long code,
	void *_cmd);
	static DECLARE_WORK(modem_fatal_work, modem_fatal_fn);
	static DECLARE_DELAYED_WORK(modem_unlock_timeout_work,
	modem_unlock_timeout);

	static struct notifier_block modem_notif_nb = {
	.notifier_call = modem_notif_handler,
	};

	static void modem_unlock_timeout(struct work_struct *work)
	{
	void __iomem *hwio_modem_reset_addr =
	ioremap_nocache(MODEM_HWIO_MSS_RESET_ADDR, 8);
	pr_crit("%s: Timeout waiting for modem to unlock.\n", MODULE_NAME);

	/* Set MSS_MODEM_RESET to 0x0 since the unlock didn't work */
	writel_relaxed(0x0, hwio_modem_reset_addr);
	/* Write needs to go through before the modem is restarted. */
	mb();
	iounmap(hwio_modem_reset_addr);

	subsystem_restart("modem");
	enable_irq(MARM_WDOG_EXPIRED);
	}

	static void modem_fatal_fn(struct work_struct *work)
	{
	uint32_t modem_state;
	uint32_t panic_smsm_states = SMSM_RESET \| SMSM_SYSTEM_DOWNLOAD;
	uint32_t reset_smsm_states = SMSM_SYSTEM_REBOOT_USR \|
	SMSM_SYSTEM_PWRDWN_USR;

	pr_err("%s: Watchdog bite received from modem!\n", MODULE_NAME);

	modem_state = smsm_get_state(SMSM_MODEM_STATE);
	pr_err("%s: Modem SMSM state = 0x%x!", MODULE_NAME, modem_state);

	if (modem_state == 0 \|\| modem_state & panic_smsm_states) {

	subsystem_restart("modem");
	enable_irq(MARM_WDOG_EXPIRED);

	} else if (modem_state & reset_smsm_states) {

	pr_err("%s: User-invoked system reset/powerdown.",
	MODULE_NAME);
	kernel_restart(NULL);

	} else {

	int ret;
	void *hwio_modem_reset_addr =
	ioremap_nocache(MODEM_HWIO_MSS_RESET_ADDR, 8);

	pr_err("%s: Modem AHB locked up.\n", MODULE_NAME);
	pr_err("%s: Trying to free up modem!\n", MODULE_NAME);

	writel_relaxed(0x3, hwio_modem_reset_addr);

	/* If we are still alive after 6 seconds (allowing for
	* the 5-second-delayed-panic-reboot), modem is either
	* still wedged or SMSM didn't come through. Force panic
	* in that case.
	*/
	ret = schedule_delayed_work(&modem_unlock_timeout_work,
	msecs_to_jiffies(6000));

	iounmap(hwio_modem_reset_addr);
	}
	}

	static int modem_notif_handler(struct notifier_block *this,
	unsigned long code,
	void *_cmd)
	{
	if (code == MODEM_NOTIFIER_START_RESET) {
	if (ignore_smsm_ack) {
	ignore_smsm_ack = 0;
	goto out;
	}
	pr_err("%s: Modem error fatal'ed.", MODULE_NAME);
	subsystem_restart("modem");
	}
	out:
	return NOTIFY_DONE;
	}

	static int modem_shutdown(const struct subsys_data *crashed_subsys)
	{
	void __iomem *modem_wdog_addr;

	/* If the modem didn't already crash, setting SMSM_RESET
	* here will help flush caches etc. The ignore_smsm_ack
	* flag is set to ignore the SMSM_RESET notification
	* that is generated due to the modem settings its own
	* SMSM_RESET bit in response to the apps setting the
	* apps SMSM_RESET bit.
	*/
	if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
	ignore_smsm_ack = 1;
	smsm_reset_modem(SMSM_RESET);
	}

	/* Disable the modem watchdog to allow clean modem bootup */
	modem_wdog_addr = ioremap_nocache(MODEM_WDOG_ENABLE, 8);
	writel_relaxed(0x0, modem_wdog_addr);

	/*
	* The write above needs to go through before the modem is
	* powered up again (subsystem restart).
	*/
	mb();
	iounmap(modem_wdog_addr);

	/* Wait here to allow the modem to clean up caches etc. */
	msleep(MODEM_CLEANUP_DELAY_MS);
	pil_force_shutdown("modem");
	disable_irq_nosync(MARM_WDOG_EXPIRED);



	return 0;
	}

	static int modem_powerup(const struct subsys_data *crashed_subsys)
	{
	int ret;

	ret = pil_force_boot("modem");
	enable_irq(MARM_WDOG_EXPIRED);

	return ret;
	}

	/* FIXME: Get address, size from PIL */
	static struct ramdump_segment modem_segments[] = {
	{0x42F00000, 0x46000000 - 0x42F00000} };

	static int modem_ramdump(int enable,
	const struct subsys_data *crashed_subsys)
	{
	if (enable)
	return do_ramdump(modem_ramdump_dev, modem_segments,
	ARRAY_SIZE(modem_segments));
	else
	return 0;
	}

	static void modem_crash_shutdown(
	const struct subsys_data *crashed_subsys)
	{
	/* If modem hasn't already crashed, send SMSM_RESET. */
	if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
	modem_unregister_notifier(&modem_notif_nb);
	smsm_reset_modem(SMSM_RESET);
	}

	/* Wait to allow the modem to clean up caches etc. */
	mdelay(5);
	}

	static irqreturn_t modem_wdog_bite_irq(int irq, void *dev_id)
	{
	int ret;

	ret = schedule_work(&modem_fatal_work);
	disable_irq_nosync(MARM_WDOG_EXPIRED);

	return IRQ_HANDLED;
	}

	static struct subsys_data subsys_8660_modem = {
	.name = "modem",
	.shutdown = modem_shutdown,
	.powerup = modem_powerup,
	.ramdump = modem_ramdump,
	.crash_shutdown = modem_crash_shutdown
	};

	static int __init modem_8660_init(void)
	{
	int ret;

	/* Need to listen for SMSM_RESET always */
	modem_register_notifier(&modem_notif_nb);

	#if defined(SUBSYS_FATAL_DEBUG)
	schedule_delayed_work(&debug_crash_modem_work, msecs_to_jiffies(5000));
	#endif

	ret = request_irq(MARM_WDOG_EXPIRED, modem_wdog_bite_irq,
	IRQF_TRIGGER_RISING, "modem_wdog", NULL);

	if (ret < 0) {
	pr_err("%s: Unable to request MARM_WDOG_EXPIRED irq.",
	__func__);
	goto out;
	}

	modem_ramdump_dev = create_ramdump_device("modem");

	if (!modem_ramdump_dev) {
	ret = -ENOMEM;
	goto out;
	}

	ret = ssr_register_subsystem(&subsys_8660_modem);
	out:
	return ret;
	}

	static void __exit modem_8660_exit(void)
	{
	free_irq(MARM_WDOG_EXPIRED, NULL);
	}

	#ifdef SUBSYS_FATAL_DEBUG
	static void debug_crash_modem_fn(struct work_struct *work)
	{
	if (reset_modem == 1)
	smsm_reset_modem(SMSM_RESET);

	reset_modem = 0;
	schedule_delayed_work(&debug_crash_modem_work, msecs_to_jiffies(1000));
	}
	#endif

	module_init(modem_8660_init);
	module_exit(modem_8660_exit);