arch/arm/mach-msm/pil-q6v4-lpass.c - kernel/msm - Gitiles

 /* Copyright (c) 2012,2013 The Linux Foundation. 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/init.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>

 #include <mach/scm.h>
 #include <mach/subsystem_restart.h>
 #include <mach/subsystem_notif.h>
 #include <mach/ramdump.h>

 #include "smd_private.h"
 #include "sysmon.h"
 #include "peripheral-loader.h"
 #include "pil-q6v4.h"
 #include "scm-pas.h"

 struct lpass_q6v4 {
 	struct q6v4_data q6;
 	void *riva_notif_hdle;
 	void *modem_notif_hdle;
 	struct subsys_device *subsys;
 	struct subsys_desc subsys_desc;
 	int crash_shutdown;
 	void *ramdump_dev;
 	struct work_struct work;
 	int loadable;
 };

 static int pil_q6v4_lpass_boot(struct pil_desc *pil)
 {
 	struct q6v4_data *drv = pil_to_q6v4_data(pil);
 	int err;

 	err = pil_q6v4_power_up(drv);
 	if (err)
 		return err;

 	return pil_q6v4_boot(pil);
 }

 static int pil_q6v4_lpass_shutdown(struct pil_desc *pil)
 {
 	struct q6v4_data *drv = pil_to_q6v4_data(pil);
 	int ret;

 	ret = pil_q6v4_shutdown(pil);
 	if (ret)
 		return ret;
 	pil_q6v4_power_down(drv);
 	return 0;
 }

 static struct pil_reset_ops pil_q6v4_lpass_ops = {
 	.auth_and_reset = pil_q6v4_lpass_boot,
 	.shutdown = pil_q6v4_lpass_shutdown,
 	.proxy_vote = pil_q6v4_make_proxy_votes,
 	.proxy_unvote = pil_q6v4_remove_proxy_votes,
 };

 static struct pil_reset_ops pil_q6v4_lpass_ops_trusted = {
 	.init_image = pil_q6v4_init_image_trusted,
 	.auth_and_reset = pil_q6v4_boot_trusted,
 	.shutdown = pil_q6v4_shutdown_trusted,
 	.proxy_vote = pil_q6v4_make_proxy_votes,
 	.proxy_unvote = pil_q6v4_remove_proxy_votes,
 };

 static int riva_notifier_cb(struct notifier_block *this, unsigned long code,
 								void *ss_handle)
 {
 	int ret;
 	switch (code) {
 	case SUBSYS_BEFORE_SHUTDOWN:
 		pr_debug("%s: R-Notify: Shutdown started\n", __func__);
 		ret = sysmon_send_event(SYSMON_SS_LPASS, "wcnss",
 				SUBSYS_BEFORE_SHUTDOWN);
 		if (ret < 0)
 			pr_err("%s: sysmon_send_event error %d", __func__, ret);
 		break;
 	}
 	return NOTIFY_DONE;
 }

 static struct notifier_block rnb = {
 	.notifier_call = riva_notifier_cb,
 };

 static int modem_notifier_cb(struct notifier_block *this, unsigned long code,
 								void *ss_handle)
 {
 	int ret;
 	switch (code) {
 	case SUBSYS_BEFORE_SHUTDOWN:
 		pr_debug("%s: M-Notify: Shutdown started\n", __func__);
 		ret = sysmon_send_event(SYSMON_SS_LPASS, "modem",
 				SUBSYS_BEFORE_SHUTDOWN);
 		if (ret < 0)
 			pr_err("%s: sysmon_send_event error %d", __func__, ret);
 		break;
 	}
 	return NOTIFY_DONE;
 }

 static struct notifier_block mnb = {
 	.notifier_call = modem_notifier_cb,
 };

 static void lpass_log_failure_reason(void)
 {
 	char *reason;
 	char buffer[81];
 	unsigned size;

 	reason = smem_get_entry(SMEM_SSR_REASON_LPASS0, &size);

 	if (!reason) {
 		pr_err("LPASS subsystem failure reason: (unknown, smem_get_entry failed).");
 		return;
 	}

 	if (reason[0] == '\0') {
 		pr_err("LPASS subsystem failure reason: (unknown, init value found)");
 		return;
 	}

 	size = min(size, sizeof(buffer) - 1);
 	memcpy(buffer, reason, size);
 	buffer[size] = '\0';
 	pr_err("LPASS subsystem failure reason: %s", buffer);
 	memset((void *)reason, 0x0, size);
 	wmb();
 }

 static void lpass_fatal_fn(struct work_struct *work)
 {
 	pr_err("Watchdog bite received from lpass Q6!\n");
 	lpass_log_failure_reason();
 	panic("Q6 Resetting the SoC");
 }

 static void lpass_smsm_state_cb(void *data, uint32_t old_state,
 				uint32_t new_state)
 {
 	struct lpass_q6v4 *drv = data;

 	/* Ignore if we're the one that set SMSM_RESET */
 	if (drv->crash_shutdown)
 		return;

 	if (new_state & SMSM_RESET) {
 		pr_err("%s: LPASS SMSM state changed to SMSM_RESET, new_state = %#x, old_state = %#x\n",
 				__func__, new_state, old_state);
 		lpass_log_failure_reason();
 		panic("Q6 Resetting the SoC");
 	}
 }

 #define SCM_Q6_NMI_CMD 0x1

 static void send_q6_nmi(void)
 {
 	/* Send NMI to QDSP6 via an SCM call. */
 	uint32_t cmd = 0x1;

 	scm_call(SCM_SVC_UTIL, SCM_Q6_NMI_CMD,
 	&cmd, sizeof(cmd), NULL, 0);

 	/* Q6 requires worstcase 100ms to dump caches etc.*/
 	mdelay(100);
 	pr_debug("%s: Q6 NMI was sent.\n", __func__);
 }

 #define subsys_to_lpass(d) container_of(d, struct lpass_q6v4, subsys_desc)

 static int lpass_start(const struct subsys_desc *desc)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(desc);

 	if (drv->loadable)
 		return pil_boot(&drv->q6.desc);
 	return 0;
 }

 static void lpass_stop(const struct subsys_desc *desc)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(desc);

 	if (drv->loadable)
 		pil_shutdown(&drv->q6.desc);
 }

 static int lpass_shutdown(const struct subsys_desc *subsys)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

 	send_q6_nmi();
 	if (drv->loadable)
 		pil_shutdown(&drv->q6.desc);
 	disable_irq_nosync(drv->q6.wdog_irq);

 	return 0;
 }

 static int lpass_powerup(const struct subsys_desc *subsys)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);
 	int ret = 0;

 	if (drv->loadable)
 		ret = pil_boot(&drv->q6.desc);
 	enable_irq(drv->q6.wdog_irq);

 	return ret;
 }

 static int lpass_ramdump(int enable, const struct subsys_desc *subsys)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

 	if (!enable)
 		return 0;

 	return pil_do_ramdump(&drv->q6.desc, drv->ramdump_dev);
 }

 static void lpass_crash_shutdown(const struct subsys_desc *subsys)
 {
 	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

 	drv->crash_shutdown = 1;
 	send_q6_nmi();
 }

 static irqreturn_t lpass_wdog_bite_irq(int irq, void *dev_id)
 {
 	struct lpass_q6v4 *drv = dev_id;

 	disable_irq_nosync(drv->q6.wdog_irq);
 	schedule_work(&drv->work);

 	return IRQ_HANDLED;
 }

 static int __devinit pil_q6v4_lpass_driver_probe(struct platform_device *pdev)
 {
 	const struct pil_q6v4_pdata *pdata = pdev->dev.platform_data;
 	struct lpass_q6v4 *drv;
 	struct q6v4_data *q6;
 	struct pil_desc *desc;
 	struct resource *res;
 	int ret;

 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
 	if (!drv)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, drv);
 	q6 = &drv->q6;
 	desc = &q6->desc;

 	q6->wdog_irq = platform_get_irq(pdev, 0);
 	if (q6->wdog_irq < 0)
 		return q6->wdog_irq;

 	drv->loadable = !!pdata; /* No pdata = don't use PIL */
 	if (drv->loadable) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		q6->base = devm_request_and_ioremap(&pdev->dev, res);
 		if (!q6->base)
 			return -ENOMEM;

 		q6->vreg = devm_regulator_get(&pdev->dev, "core_vdd");
 		if (IS_ERR(q6->vreg))
 			return PTR_ERR(q6->vreg);

 		q6->xo = devm_clk_get(&pdev->dev, "xo");
 		if (IS_ERR(q6->xo))
 			return PTR_ERR(q6->xo);

 		desc->name = pdata->name;
 		desc->dev = &pdev->dev;
 		desc->owner = THIS_MODULE;
 		desc->proxy_timeout = 10000;
 		pil_q6v4_init(q6, pdata);

 		if (pas_supported(pdata->pas_id) > 0) {
 			desc->ops = &pil_q6v4_lpass_ops_trusted;
 			dev_info(&pdev->dev, "using secure boot\n");
 		} else {
 			desc->ops = &pil_q6v4_lpass_ops;
 			dev_info(&pdev->dev, "using non-secure boot\n");
 		}

 		ret = pil_desc_init(desc);
 		if (ret)
 			return ret;
 	}

 	drv->subsys_desc.name = "adsp";
 	drv->subsys_desc.dev = &pdev->dev;
 	drv->subsys_desc.owner = THIS_MODULE;
 	drv->subsys_desc.start = lpass_start;
 	drv->subsys_desc.stop = lpass_stop;
 	drv->subsys_desc.shutdown = lpass_shutdown;
 	drv->subsys_desc.powerup = lpass_powerup;
 	drv->subsys_desc.ramdump = lpass_ramdump;
 	drv->subsys_desc.crash_shutdown = lpass_crash_shutdown;

 	INIT_WORK(&drv->work, lpass_fatal_fn);

 	drv->ramdump_dev = create_ramdump_device("lpass", &pdev->dev);
 	if (!drv->ramdump_dev) {
 		ret = -ENOMEM;
 		goto err_ramdump;
 	}

 	drv->subsys = subsys_register(&drv->subsys_desc);
 	if (IS_ERR(drv->subsys)) {
 		ret = PTR_ERR(drv->subsys);
 		goto err_subsys;
 	}
 	if (!drv->loadable)
 		subsys_default_online(drv->subsys);

 	ret = devm_request_irq(&pdev->dev, q6->wdog_irq, lpass_wdog_bite_irq,
 			IRQF_TRIGGER_RISING, dev_name(&pdev->dev), drv);
 	if (ret)
 		goto err_irq;

 	ret = smsm_state_cb_register(SMSM_Q6_STATE, SMSM_RESET,
 			lpass_smsm_state_cb, drv);
 	if (ret < 0)
 		goto err_smsm;

 	drv->riva_notif_hdle = subsys_notif_register_notifier("riva", &rnb);
 	if (IS_ERR(drv->riva_notif_hdle)) {
 		ret = PTR_ERR(drv->riva_notif_hdle);
 		goto err_notif_riva;
 	}

 	drv->modem_notif_hdle = subsys_notif_register_notifier("modem", &mnb);
 	if (IS_ERR(drv->modem_notif_hdle)) {
 		ret = PTR_ERR(drv->modem_notif_hdle);
 		goto err_notif_modem;
 	}
 	return 0;
 err_notif_modem:
 	subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
 err_notif_riva:
 	smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
 			lpass_smsm_state_cb, drv);
 err_smsm:
 err_irq:
 	subsys_unregister(drv->subsys);
 err_subsys:
 	destroy_ramdump_device(drv->ramdump_dev);
 err_ramdump:
 	if (drv->loadable)
 		pil_desc_release(desc);
 	return ret;
 }

 static int __devexit pil_q6v4_lpass_driver_exit(struct platform_device *pdev)
 {
 	struct lpass_q6v4 *drv = platform_get_drvdata(pdev);
 	subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
 	subsys_notif_unregister_notifier(drv->modem_notif_hdle, &mnb);
 	smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
 			lpass_smsm_state_cb, drv);
 	subsys_unregister(drv->subsys);
 	destroy_ramdump_device(drv->ramdump_dev);
 	if (drv->loadable)
 		pil_desc_release(&drv->q6.desc);
 	return 0;
 }

 static struct platform_driver pil_q6v4_lpass_driver = {
 	.probe = pil_q6v4_lpass_driver_probe,
 	.remove = __devexit_p(pil_q6v4_lpass_driver_exit),
 	.driver = {
 		.name = "pil-q6v4-lpass",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init pil_q6v4_lpass_init(void)
 {
 	return platform_driver_register(&pil_q6v4_lpass_driver);
 }
 module_init(pil_q6v4_lpass_init);

 static void __exit pil_q6v4_lpass_exit(void)
 {
 	platform_driver_unregister(&pil_q6v4_lpass_driver);
 }
 module_exit(pil_q6v4_lpass_exit);

 MODULE_DESCRIPTION("Support for booting QDSP6v4 (Hexagon) processors");
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2012,2013 The Linux Foundation. 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/init.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>
	#include <linux/err.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/interrupt.h>
	#include <linux/workqueue.h>
	#include <linux/delay.h>

	#include <mach/scm.h>
	#include <mach/subsystem_restart.h>
	#include <mach/subsystem_notif.h>
	#include <mach/ramdump.h>

	#include "smd_private.h"
	#include "sysmon.h"
	#include "peripheral-loader.h"
	#include "pil-q6v4.h"
	#include "scm-pas.h"

	struct lpass_q6v4 {
	struct q6v4_data q6;
	void *riva_notif_hdle;
	void *modem_notif_hdle;
	struct subsys_device *subsys;
	struct subsys_desc subsys_desc;
	int crash_shutdown;
	void *ramdump_dev;
	struct work_struct work;
	int loadable;
	};

	static int pil_q6v4_lpass_boot(struct pil_desc *pil)
	{
	struct q6v4_data *drv = pil_to_q6v4_data(pil);
	int err;

	err = pil_q6v4_power_up(drv);
	if (err)
	return err;

	return pil_q6v4_boot(pil);
	}

	static int pil_q6v4_lpass_shutdown(struct pil_desc *pil)
	{
	struct q6v4_data *drv = pil_to_q6v4_data(pil);
	int ret;

	ret = pil_q6v4_shutdown(pil);
	if (ret)
	return ret;
	pil_q6v4_power_down(drv);
	return 0;
	}

	static struct pil_reset_ops pil_q6v4_lpass_ops = {
	.auth_and_reset = pil_q6v4_lpass_boot,
	.shutdown = pil_q6v4_lpass_shutdown,
	.proxy_vote = pil_q6v4_make_proxy_votes,
	.proxy_unvote = pil_q6v4_remove_proxy_votes,
	};

	static struct pil_reset_ops pil_q6v4_lpass_ops_trusted = {
	.init_image = pil_q6v4_init_image_trusted,
	.auth_and_reset = pil_q6v4_boot_trusted,
	.shutdown = pil_q6v4_shutdown_trusted,
	.proxy_vote = pil_q6v4_make_proxy_votes,
	.proxy_unvote = pil_q6v4_remove_proxy_votes,
	};

	static int riva_notifier_cb(struct notifier_block *this, unsigned long code,
	void *ss_handle)
	{
	int ret;
	switch (code) {
	case SUBSYS_BEFORE_SHUTDOWN:
	pr_debug("%s: R-Notify: Shutdown started\n", __func__);
	ret = sysmon_send_event(SYSMON_SS_LPASS, "wcnss",
	SUBSYS_BEFORE_SHUTDOWN);
	if (ret < 0)
	pr_err("%s: sysmon_send_event error %d", __func__, ret);
	break;
	}
	return NOTIFY_DONE;
	}

	static struct notifier_block rnb = {
	.notifier_call = riva_notifier_cb,
	};

	static int modem_notifier_cb(struct notifier_block *this, unsigned long code,
	void *ss_handle)
	{
	int ret;
	switch (code) {
	case SUBSYS_BEFORE_SHUTDOWN:
	pr_debug("%s: M-Notify: Shutdown started\n", __func__);
	ret = sysmon_send_event(SYSMON_SS_LPASS, "modem",
	SUBSYS_BEFORE_SHUTDOWN);
	if (ret < 0)
	pr_err("%s: sysmon_send_event error %d", __func__, ret);
	break;
	}
	return NOTIFY_DONE;
	}

	static struct notifier_block mnb = {
	.notifier_call = modem_notifier_cb,
	};

	static void lpass_log_failure_reason(void)
	{
	char *reason;
	char buffer[81];
	unsigned size;

	reason = smem_get_entry(SMEM_SSR_REASON_LPASS0, &size);

	if (!reason) {
	pr_err("LPASS subsystem failure reason: (unknown, smem_get_entry failed).");
	return;
	}

	if (reason[0] == '\0') {
	pr_err("LPASS subsystem failure reason: (unknown, init value found)");
	return;
	}

	size = min(size, sizeof(buffer) - 1);
	memcpy(buffer, reason, size);
	buffer[size] = '\0';
	pr_err("LPASS subsystem failure reason: %s", buffer);
	memset((void *)reason, 0x0, size);
	wmb();
	}

	static void lpass_fatal_fn(struct work_struct *work)
	{
	pr_err("Watchdog bite received from lpass Q6!\n");
	lpass_log_failure_reason();
	panic("Q6 Resetting the SoC");
	}

	static void lpass_smsm_state_cb(void *data, uint32_t old_state,
	uint32_t new_state)
	{
	struct lpass_q6v4 *drv = data;

	/* Ignore if we're the one that set SMSM_RESET */
	if (drv->crash_shutdown)
	return;

	if (new_state & SMSM_RESET) {
	pr_err("%s: LPASS SMSM state changed to SMSM_RESET, new_state = %#x, old_state = %#x\n",
	__func__, new_state, old_state);
	lpass_log_failure_reason();
	panic("Q6 Resetting the SoC");
	}
	}

	#define SCM_Q6_NMI_CMD 0x1

	static void send_q6_nmi(void)
	{
	/* Send NMI to QDSP6 via an SCM call. */
	uint32_t cmd = 0x1;

	scm_call(SCM_SVC_UTIL, SCM_Q6_NMI_CMD,
	&cmd, sizeof(cmd), NULL, 0);

	/* Q6 requires worstcase 100ms to dump caches etc.*/
	mdelay(100);
	pr_debug("%s: Q6 NMI was sent.\n", __func__);
	}

	#define subsys_to_lpass(d) container_of(d, struct lpass_q6v4, subsys_desc)

	static int lpass_start(const struct subsys_desc *desc)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(desc);

	if (drv->loadable)
	return pil_boot(&drv->q6.desc);
	return 0;
	}

	static void lpass_stop(const struct subsys_desc *desc)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(desc);

	if (drv->loadable)
	pil_shutdown(&drv->q6.desc);
	}

	static int lpass_shutdown(const struct subsys_desc *subsys)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

	send_q6_nmi();
	if (drv->loadable)
	pil_shutdown(&drv->q6.desc);
	disable_irq_nosync(drv->q6.wdog_irq);

	return 0;
	}

	static int lpass_powerup(const struct subsys_desc *subsys)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);
	int ret = 0;

	if (drv->loadable)
	ret = pil_boot(&drv->q6.desc);
	enable_irq(drv->q6.wdog_irq);

	return ret;
	}

	static int lpass_ramdump(int enable, const struct subsys_desc *subsys)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

	if (!enable)
	return 0;

	return pil_do_ramdump(&drv->q6.desc, drv->ramdump_dev);
	}

	static void lpass_crash_shutdown(const struct subsys_desc *subsys)
	{
	struct lpass_q6v4 *drv = subsys_to_lpass(subsys);

	drv->crash_shutdown = 1;
	send_q6_nmi();
	}

	static irqreturn_t lpass_wdog_bite_irq(int irq, void *dev_id)
	{
	struct lpass_q6v4 *drv = dev_id;

	disable_irq_nosync(drv->q6.wdog_irq);
	schedule_work(&drv->work);

	return IRQ_HANDLED;
	}

	static int __devinit pil_q6v4_lpass_driver_probe(struct platform_device *pdev)
	{
	const struct pil_q6v4_pdata *pdata = pdev->dev.platform_data;
	struct lpass_q6v4 *drv;
	struct q6v4_data *q6;
	struct pil_desc *desc;
	struct resource *res;
	int ret;

	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
	if (!drv)
	return -ENOMEM;
	platform_set_drvdata(pdev, drv);
	q6 = &drv->q6;
	desc = &q6->desc;

	q6->wdog_irq = platform_get_irq(pdev, 0);
	if (q6->wdog_irq < 0)
	return q6->wdog_irq;

	drv->loadable = !!pdata; /* No pdata = don't use PIL */
	if (drv->loadable) {
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	q6->base = devm_request_and_ioremap(&pdev->dev, res);
	if (!q6->base)
	return -ENOMEM;

	q6->vreg = devm_regulator_get(&pdev->dev, "core_vdd");
	if (IS_ERR(q6->vreg))
	return PTR_ERR(q6->vreg);

	q6->xo = devm_clk_get(&pdev->dev, "xo");
	if (IS_ERR(q6->xo))
	return PTR_ERR(q6->xo);

	desc->name = pdata->name;
	desc->dev = &pdev->dev;
	desc->owner = THIS_MODULE;
	desc->proxy_timeout = 10000;
	pil_q6v4_init(q6, pdata);

	if (pas_supported(pdata->pas_id) > 0) {
	desc->ops = &pil_q6v4_lpass_ops_trusted;
	dev_info(&pdev->dev, "using secure boot\n");
	} else {
	desc->ops = &pil_q6v4_lpass_ops;
	dev_info(&pdev->dev, "using non-secure boot\n");
	}

	ret = pil_desc_init(desc);
	if (ret)
	return ret;
	}

	drv->subsys_desc.name = "adsp";
	drv->subsys_desc.dev = &pdev->dev;
	drv->subsys_desc.owner = THIS_MODULE;
	drv->subsys_desc.start = lpass_start;
	drv->subsys_desc.stop = lpass_stop;
	drv->subsys_desc.shutdown = lpass_shutdown;
	drv->subsys_desc.powerup = lpass_powerup;
	drv->subsys_desc.ramdump = lpass_ramdump;
	drv->subsys_desc.crash_shutdown = lpass_crash_shutdown;

	INIT_WORK(&drv->work, lpass_fatal_fn);

	drv->ramdump_dev = create_ramdump_device("lpass", &pdev->dev);
	if (!drv->ramdump_dev) {
	ret = -ENOMEM;
	goto err_ramdump;
	}

	drv->subsys = subsys_register(&drv->subsys_desc);
	if (IS_ERR(drv->subsys)) {
	ret = PTR_ERR(drv->subsys);
	goto err_subsys;
	}
	if (!drv->loadable)
	subsys_default_online(drv->subsys);

	ret = devm_request_irq(&pdev->dev, q6->wdog_irq, lpass_wdog_bite_irq,
	IRQF_TRIGGER_RISING, dev_name(&pdev->dev), drv);
	if (ret)
	goto err_irq;

	ret = smsm_state_cb_register(SMSM_Q6_STATE, SMSM_RESET,
	lpass_smsm_state_cb, drv);
	if (ret < 0)
	goto err_smsm;

	drv->riva_notif_hdle = subsys_notif_register_notifier("riva", &rnb);
	if (IS_ERR(drv->riva_notif_hdle)) {
	ret = PTR_ERR(drv->riva_notif_hdle);
	goto err_notif_riva;
	}

	drv->modem_notif_hdle = subsys_notif_register_notifier("modem", &mnb);
	if (IS_ERR(drv->modem_notif_hdle)) {
	ret = PTR_ERR(drv->modem_notif_hdle);
	goto err_notif_modem;
	}
	return 0;
	err_notif_modem:
	subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
	err_notif_riva:
	smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
	lpass_smsm_state_cb, drv);
	err_smsm:
	err_irq:
	subsys_unregister(drv->subsys);
	err_subsys:
	destroy_ramdump_device(drv->ramdump_dev);
	err_ramdump:
	if (drv->loadable)
	pil_desc_release(desc);
	return ret;
	}

	static int __devexit pil_q6v4_lpass_driver_exit(struct platform_device *pdev)
	{
	struct lpass_q6v4 *drv = platform_get_drvdata(pdev);
	subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
	subsys_notif_unregister_notifier(drv->modem_notif_hdle, &mnb);
	smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
	lpass_smsm_state_cb, drv);
	subsys_unregister(drv->subsys);
	destroy_ramdump_device(drv->ramdump_dev);
	if (drv->loadable)
	pil_desc_release(&drv->q6.desc);
	return 0;
	}

	static struct platform_driver pil_q6v4_lpass_driver = {
	.probe = pil_q6v4_lpass_driver_probe,
	.remove = __devexit_p(pil_q6v4_lpass_driver_exit),
	.driver = {
	.name = "pil-q6v4-lpass",
	.owner = THIS_MODULE,
	},
	};

	static int __init pil_q6v4_lpass_init(void)
	{
	return platform_driver_register(&pil_q6v4_lpass_driver);
	}
	module_init(pil_q6v4_lpass_init);

	static void __exit pil_q6v4_lpass_exit(void)
	{
	platform_driver_unregister(&pil_q6v4_lpass_driver);
	}
	module_exit(pil_q6v4_lpass_exit);

	MODULE_DESCRIPTION("Support for booting QDSP6v4 (Hexagon) processors");
	MODULE_LICENSE("GPL v2");