drivers/soc/qcom/pil-q6v5-mss.c - kernel/msm - Git at Google

 /*
  * Copyright (c) 2012-2015, 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/io.h>
 #include <linux/iopoll.h>
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/proc_fs.h>
 #include <linux/regulator/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
 #include <linux/of_gpio.h>
 #include <linux/clk/msm-clk.h>
 #include <soc/qcom/subsystem_restart.h>
 #include <soc/qcom/ramdump.h>
 #include <soc/qcom/smem.h>
 #include <soc/qcom/smsm.h>

 #include "peripheral-loader.h"
 #include "pil-q6v5.h"
 #include "pil-msa.h"

 #define MAX_VDD_MSS_UV		1150000
 #define PROXY_TIMEOUT_MS	10000
 #define MAX_SSR_REASON_LEN	81U
 #define STOP_ACK_TIMEOUT_MS	1000

 #define subsys_to_drv(d) container_of(d, struct modem_data, subsys_desc)

 static char modem_reset_reason[MAX_SSR_REASON_LEN];
 static u32  modem_reset_count = 0;

 static void log_modem_sfr(void)
 {
 	u32 size;
 	char *smem_reason, reason[MAX_SSR_REASON_LEN];

 	smem_reason = smem_get_entry_no_rlock(SMEM_SSR_REASON_MSS0, &size, 0,
 							SMEM_ANY_HOST_FLAG);
 	if (!smem_reason || !size) {
 		pr_err("modem subsystem failure reason: (unknown, smem_get_entry_no_rlock failed).\n");
 		return;
 	}
 	if (!smem_reason[0]) {
 		pr_err("modem subsystem failure reason: (unknown, empty string found).\n");
 		return;
 	}

 	strlcpy(reason, smem_reason, min(size, MAX_SSR_REASON_LEN));
 	pr_err("modem subsystem failure reason: %s.\n", reason);

 	strlcpy(modem_reset_reason, reason, min(size, MAX_SSR_REASON_LEN));
 	modem_reset_count++;

 	smem_reason[0] = '\0';
 	wmb();
 }

 static void restart_modem(struct modem_data *drv)
 {
 	log_modem_sfr();
 	drv->ignore_errors = true;
 	subsystem_restart_dev(drv->subsys);
 }

 static irqreturn_t modem_err_fatal_intr_handler(int irq, void *dev_id)
 {
 	struct modem_data *drv = subsys_to_drv(dev_id);

 	/* Ignore if we're the one that set the force stop GPIO */
 	if (drv->crash_shutdown)
 		return IRQ_HANDLED;

 	pr_err("Fatal error on the modem.\n");
 	subsys_set_crash_status(drv->subsys, true);
 	restart_modem(drv);
 	return IRQ_HANDLED;
 }

 static irqreturn_t modem_stop_ack_intr_handler(int irq, void *dev_id)
 {
 	struct modem_data *drv = subsys_to_drv(dev_id);
 	pr_info("Received stop ack interrupt from modem\n");
 	complete(&drv->stop_ack);
 	return IRQ_HANDLED;
 }

 static int modem_shutdown(const struct subsys_desc *subsys, bool force_stop)
 {
 	struct modem_data *drv = subsys_to_drv(subsys);
 	unsigned long ret;

 	if (subsys->is_not_loadable)
 		return 0;

 	if (!subsys_get_crash_status(drv->subsys) && force_stop &&
 	    subsys->force_stop_gpio) {
 		gpio_set_value(subsys->force_stop_gpio, 1);
 		ret = wait_for_completion_timeout(&drv->stop_ack,
 				msecs_to_jiffies(STOP_ACK_TIMEOUT_MS));
 		if (!ret)
 			pr_warn("Timed out on stop ack from modem.\n");
 		gpio_set_value(subsys->force_stop_gpio, 0);
 	}

 	if (drv->subsys_desc.ramdump_disable_gpio) {
 		drv->subsys_desc.ramdump_disable = gpio_get_value(
 					drv->subsys_desc.ramdump_disable_gpio);
 		 pr_warn("Ramdump disable gpio value is %d\n",
 			drv->subsys_desc.ramdump_disable);
 	}

 	pil_shutdown(&drv->q6->desc);

 	return 0;
 }

 static int modem_powerup(const struct subsys_desc *subsys)
 {
 	struct modem_data *drv = subsys_to_drv(subsys);

 	if (subsys->is_not_loadable)
 		return 0;
 	/*
 	 * At this time, the modem is shutdown. Therefore this function cannot
 	 * run concurrently with the watchdog bite error handler, making it safe
 	 * to unset the flag below.
 	 */
 	INIT_COMPLETION(drv->stop_ack);
 	drv->subsys_desc.ramdump_disable = 0;
 	drv->ignore_errors = false;
 	drv->q6->desc.fw_name = subsys->fw_name;
 	return pil_boot(&drv->q6->desc);
 }

 static void modem_crash_shutdown(const struct subsys_desc *subsys)
 {
 	struct modem_data *drv = subsys_to_drv(subsys);
 	drv->crash_shutdown = true;
 	if (!subsys_get_crash_status(drv->subsys) &&
 		subsys->force_stop_gpio) {
 		gpio_set_value(subsys->force_stop_gpio, 1);
 		mdelay(STOP_ACK_TIMEOUT_MS);
 	}
 }

 static void modem_free_memory(const struct subsys_desc *subsys)
 {
 	struct modem_data *drv = subsys_to_drv(subsys);

 	pil_free_memory(&drv->q6->desc);
 }

 static int modem_ramdump(int enable, const struct subsys_desc *subsys)
 {
 	struct modem_data *drv = subsys_to_drv(subsys);
 	int ret;

 	if (!enable)
 		return 0;

 	ret = pil_mss_make_proxy_votes(&drv->q6->desc);
 	if (ret)
 		return ret;

 	ret = pil_mss_reset_load_mba(&drv->q6->desc);
 	if (ret)
 		return ret;

 	ret = pil_do_ramdump(&drv->q6->desc, drv->ramdump_dev);
 	if (ret < 0)
 		pr_err("Unable to dump modem fw memory (rc = %d).\n", ret);

 	ret = __pil_mss_deinit_image(&drv->q6->desc, false);
 	if (ret < 0)
 		pr_err("Unable to free up resources (rc = %d).\n", ret);

 	pil_mss_remove_proxy_votes(&drv->q6->desc);
 	return ret;
 }

 static irqreturn_t modem_wdog_bite_intr_handler(int irq, void *dev_id)
 {
 	struct modem_data *drv = subsys_to_drv(dev_id);
 	if (drv->ignore_errors)
 		return IRQ_HANDLED;

 	pr_err("Watchdog bite received from modem software!\n");
 	if (drv->subsys_desc.system_debug &&
 			!gpio_get_value(drv->subsys_desc.err_fatal_gpio))
 		panic("%s: System ramdump requested. Triggering device restart!\n",
 							__func__);
 	subsys_set_crash_status(drv->subsys, true);
 	restart_modem(drv);
 	return IRQ_HANDLED;
 }

 static int pil_subsys_init(struct modem_data *drv,
 					struct platform_device *pdev)
 {
 	int ret;

 	drv->subsys_desc.name = "modem";
 	drv->subsys_desc.dev = &pdev->dev;
 	drv->subsys_desc.owner = THIS_MODULE;
 	drv->subsys_desc.shutdown = modem_shutdown;
 	drv->subsys_desc.powerup = modem_powerup;
 	drv->subsys_desc.ramdump = modem_ramdump;
 	drv->subsys_desc.free_memory = modem_free_memory;
 	drv->subsys_desc.crash_shutdown = modem_crash_shutdown;
 	drv->subsys_desc.err_fatal_handler = modem_err_fatal_intr_handler;
 	drv->subsys_desc.stop_ack_handler = modem_stop_ack_intr_handler;
 	drv->subsys_desc.wdog_bite_handler = modem_wdog_bite_intr_handler;

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

 	drv->ramdump_dev = create_ramdump_device("modem", &pdev->dev);
 	if (!drv->ramdump_dev) {
 		pr_err("%s: Unable to create a modem ramdump device.\n",
 			__func__);
 		ret = -ENOMEM;
 		goto err_ramdump;
 	}

 	return 0;

 err_ramdump:
 	subsys_unregister(drv->subsys);
 err_subsys:
 	return ret;
 }

 static int pil_mss_loadable_init(struct modem_data *drv,
 					struct platform_device *pdev)
 {
 	struct q6v5_data *q6;
 	struct pil_desc *q6_desc;
 	struct resource *res;
 	struct property *prop;
 	int ret;

 	q6 = pil_q6v5_init(pdev);
 	if (IS_ERR(q6))
 		return PTR_ERR(q6);
 	drv->q6 = q6;
 	drv->xo = q6->xo;

 	q6_desc = &q6->desc;
 	q6_desc->owner = THIS_MODULE;
 	q6_desc->proxy_timeout = PROXY_TIMEOUT_MS;

 	q6_desc->ops = &pil_msa_mss_ops;

 	q6->self_auth = of_property_read_bool(pdev->dev.of_node,
 							"qcom,pil-self-auth");
 	if (q6->self_auth) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						    "rmb_base");
 		q6->rmb_base = devm_request_and_ioremap(&pdev->dev, res);
 		if (!q6->rmb_base)
 			return -ENOMEM;
 		drv->rmb_base = q6->rmb_base;
 		q6_desc->ops = &pil_msa_mss_ops_selfauth;
 	}

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "restart_reg");
 	if (!res) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 							"restart_reg_sec");
 		q6->restart_reg_sec = true;
 	}

 	q6->restart_reg = devm_request_and_ioremap(&pdev->dev, res);
 	if (!q6->restart_reg)
 		return -ENOMEM;

 	q6->vreg = NULL;

 	prop = of_find_property(pdev->dev.of_node, "vdd_mss-supply", NULL);
 	if (prop) {
 		q6->vreg = devm_regulator_get(&pdev->dev, "vdd_mss");
 		if (IS_ERR(q6->vreg))
 			return PTR_ERR(q6->vreg);

 		ret = regulator_set_voltage(q6->vreg, VDD_MSS_UV,
 						MAX_VDD_MSS_UV);
 		if (ret)
 			dev_err(&pdev->dev, "Failed to set vreg voltage.\n");

 		ret = regulator_set_optimum_mode(q6->vreg, 100000);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "Failed to set vreg mode.\n");
 			return ret;
 		}
 	}

 	q6->vreg_mx = devm_regulator_get(&pdev->dev, "vdd_mx");
 	if (IS_ERR(q6->vreg_mx))
 		return PTR_ERR(q6->vreg_mx);
 	prop = of_find_property(pdev->dev.of_node, "vdd_mx-uV", NULL);
 	if (!prop) {
 		dev_err(&pdev->dev, "Missing vdd_mx-uV property\n");
 		return -EINVAL;
 	}

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 		"cxrail_bhs_reg");
 	if (res)
 		q6->cxrail_bhs = devm_ioremap(&pdev->dev, res->start,
 					  resource_size(res));

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

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

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

 	/* Optional. */
 	if (of_property_match_string(pdev->dev.of_node,
 			"qcom,active-clock-names", "gpll0_mss_clk") >= 0)
 		q6->gpll0_mss_clk = devm_clk_get(&pdev->dev, "gpll0_mss_clk");

 	ret = pil_desc_init(q6_desc);

 	return ret;
 }

 static int pil_mss_driver_probe(struct platform_device *pdev)
 {
 	struct modem_data *drv;
 	int ret, is_not_loadable;

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

 	is_not_loadable = of_property_read_bool(pdev->dev.of_node,
 							"qcom,is-not-loadable");
 	if (is_not_loadable) {
 		drv->subsys_desc.is_not_loadable = 1;
 	} else {
 		ret = pil_mss_loadable_init(drv, pdev);
 		if (ret)
 			return ret;
 	}
 	init_completion(&drv->stop_ack);

 	return pil_subsys_init(drv, pdev);
 }

 static int pil_mss_driver_exit(struct platform_device *pdev)
 {
 	struct modem_data *drv = platform_get_drvdata(pdev);

 	subsys_unregister(drv->subsys);
 	destroy_ramdump_device(drv->ramdump_dev);
 	pil_desc_release(&drv->q6->desc);
 	return 0;
 }

 static struct of_device_id mss_match_table[] = {
 	{ .compatible = "qcom,pil-q6v5-mss" },
 	{ .compatible = "qcom,pil-q6v55-mss" },
 	{ .compatible = "qcom,pil-q6v56-mss" },
 	{}
 };

 static struct platform_driver pil_mss_driver = {
 	.probe = pil_mss_driver_probe,
 	.remove = pil_mss_driver_exit,
 	.driver = {
 		.name = "pil-q6v5-mss",
 		.of_match_table = mss_match_table,
 		.owner = THIS_MODULE,
 	},
 };

 static int __init pil_mss_init(void)
 {
 	memset(modem_reset_reason, 0, sizeof(modem_reset_reason));
 	snprintf(modem_reset_reason, MAX_SSR_REASON_LEN - 1,
 	        "%s", "No modem crash happened.");

 	return platform_driver_register(&pil_mss_driver);
 }
 module_init(pil_mss_init);

 static void __exit pil_mss_exit(void)
 {
 	platform_driver_unregister(&pil_mss_driver);
 }
 module_exit(pil_mss_exit);

 /*
  *   /porc/modem_exception shows the times of modem crash and reason.
  */

 static int modem_exception_proc_show(struct seq_file *m, void *v)
 {
 	seq_printf(m, "[%d] %s\n", modem_reset_count, modem_reset_reason);
 	return 0;
 }

 static int modem_exception_proc_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, modem_exception_proc_show, NULL);
 }

 static const struct file_operations modem_exception_proc_fops = {
 	.open		= modem_exception_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };

 static int __init proc_modem_exception_init(void)
 {
 	proc_create("modem_exception", 0, NULL, &modem_exception_proc_fops);
 	return 0;
 }
 module_init(proc_modem_exception_init);


 MODULE_DESCRIPTION("Support for booting modem subsystems with QDSP6v5 Hexagon processors");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2012-2015, 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/io.h>
	#include <linux/iopoll.h>
	#include <linux/ioport.h>
	#include <linux/delay.h>
	#include <linux/sched.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/of.h>
	#include <linux/proc_fs.h>
	#include <linux/regulator/consumer.h>
	#include <linux/interrupt.h>
	#include <linux/dma-mapping.h>
	#include <linux/of_gpio.h>
	#include <linux/clk/msm-clk.h>
	#include <soc/qcom/subsystem_restart.h>
	#include <soc/qcom/ramdump.h>
	#include <soc/qcom/smem.h>
	#include <soc/qcom/smsm.h>

	#include "peripheral-loader.h"
	#include "pil-q6v5.h"
	#include "pil-msa.h"

	#define MAX_VDD_MSS_UV 1150000
	#define PROXY_TIMEOUT_MS 10000
	#define MAX_SSR_REASON_LEN 81U
	#define STOP_ACK_TIMEOUT_MS 1000

	#define subsys_to_drv(d) container_of(d, struct modem_data, subsys_desc)

	static char modem_reset_reason[MAX_SSR_REASON_LEN];
	static u32 modem_reset_count = 0;

	static void log_modem_sfr(void)
	{
	u32 size;
	char *smem_reason, reason[MAX_SSR_REASON_LEN];

	smem_reason = smem_get_entry_no_rlock(SMEM_SSR_REASON_MSS0, &size, 0,
	SMEM_ANY_HOST_FLAG);
	if (!smem_reason \|\| !size) {
	pr_err("modem subsystem failure reason: (unknown, smem_get_entry_no_rlock failed).\n");
	return;
	}
	if (!smem_reason[0]) {
	pr_err("modem subsystem failure reason: (unknown, empty string found).\n");
	return;
	}

	strlcpy(reason, smem_reason, min(size, MAX_SSR_REASON_LEN));
	pr_err("modem subsystem failure reason: %s.\n", reason);

	strlcpy(modem_reset_reason, reason, min(size, MAX_SSR_REASON_LEN));
	modem_reset_count++;

	smem_reason[0] = '\0';
	wmb();
	}

	static void restart_modem(struct modem_data *drv)
	{
	log_modem_sfr();
	drv->ignore_errors = true;
	subsystem_restart_dev(drv->subsys);
	}

	static irqreturn_t modem_err_fatal_intr_handler(int irq, void *dev_id)
	{
	struct modem_data *drv = subsys_to_drv(dev_id);

	/* Ignore if we're the one that set the force stop GPIO */
	if (drv->crash_shutdown)
	return IRQ_HANDLED;

	pr_err("Fatal error on the modem.\n");
	subsys_set_crash_status(drv->subsys, true);
	restart_modem(drv);
	return IRQ_HANDLED;
	}

	static irqreturn_t modem_stop_ack_intr_handler(int irq, void *dev_id)
	{
	struct modem_data *drv = subsys_to_drv(dev_id);
	pr_info("Received stop ack interrupt from modem\n");
	complete(&drv->stop_ack);
	return IRQ_HANDLED;
	}

	static int modem_shutdown(const struct subsys_desc *subsys, bool force_stop)
	{
	struct modem_data *drv = subsys_to_drv(subsys);
	unsigned long ret;

	if (subsys->is_not_loadable)
	return 0;

	if (!subsys_get_crash_status(drv->subsys) && force_stop &&
	subsys->force_stop_gpio) {
	gpio_set_value(subsys->force_stop_gpio, 1);
	ret = wait_for_completion_timeout(&drv->stop_ack,
	msecs_to_jiffies(STOP_ACK_TIMEOUT_MS));
	if (!ret)
	pr_warn("Timed out on stop ack from modem.\n");
	gpio_set_value(subsys->force_stop_gpio, 0);
	}

	if (drv->subsys_desc.ramdump_disable_gpio) {
	drv->subsys_desc.ramdump_disable = gpio_get_value(
	drv->subsys_desc.ramdump_disable_gpio);
	pr_warn("Ramdump disable gpio value is %d\n",
	drv->subsys_desc.ramdump_disable);
	}

	pil_shutdown(&drv->q6->desc);

	return 0;
	}

	static int modem_powerup(const struct subsys_desc *subsys)
	{
	struct modem_data *drv = subsys_to_drv(subsys);

	if (subsys->is_not_loadable)
	return 0;
	/*
	* At this time, the modem is shutdown. Therefore this function cannot
	* run concurrently with the watchdog bite error handler, making it safe
	* to unset the flag below.
	*/
	INIT_COMPLETION(drv->stop_ack);
	drv->subsys_desc.ramdump_disable = 0;
	drv->ignore_errors = false;
	drv->q6->desc.fw_name = subsys->fw_name;
	return pil_boot(&drv->q6->desc);
	}

	static void modem_crash_shutdown(const struct subsys_desc *subsys)
	{
	struct modem_data *drv = subsys_to_drv(subsys);
	drv->crash_shutdown = true;
	if (!subsys_get_crash_status(drv->subsys) &&
	subsys->force_stop_gpio) {
	gpio_set_value(subsys->force_stop_gpio, 1);
	mdelay(STOP_ACK_TIMEOUT_MS);
	}
	}

	static void modem_free_memory(const struct subsys_desc *subsys)
	{
	struct modem_data *drv = subsys_to_drv(subsys);

	pil_free_memory(&drv->q6->desc);
	}

	static int modem_ramdump(int enable, const struct subsys_desc *subsys)
	{
	struct modem_data *drv = subsys_to_drv(subsys);
	int ret;

	if (!enable)
	return 0;

	ret = pil_mss_make_proxy_votes(&drv->q6->desc);
	if (ret)
	return ret;

	ret = pil_mss_reset_load_mba(&drv->q6->desc);
	if (ret)
	return ret;

	ret = pil_do_ramdump(&drv->q6->desc, drv->ramdump_dev);
	if (ret < 0)
	pr_err("Unable to dump modem fw memory (rc = %d).\n", ret);

	ret = __pil_mss_deinit_image(&drv->q6->desc, false);
	if (ret < 0)
	pr_err("Unable to free up resources (rc = %d).\n", ret);

	pil_mss_remove_proxy_votes(&drv->q6->desc);
	return ret;
	}

	static irqreturn_t modem_wdog_bite_intr_handler(int irq, void *dev_id)
	{
	struct modem_data *drv = subsys_to_drv(dev_id);
	if (drv->ignore_errors)
	return IRQ_HANDLED;

	pr_err("Watchdog bite received from modem software!\n");
	if (drv->subsys_desc.system_debug &&
	!gpio_get_value(drv->subsys_desc.err_fatal_gpio))
	panic("%s: System ramdump requested. Triggering device restart!\n",
	__func__);
	subsys_set_crash_status(drv->subsys, true);
	restart_modem(drv);
	return IRQ_HANDLED;
	}

	static int pil_subsys_init(struct modem_data *drv,
	struct platform_device *pdev)
	{
	int ret;

	drv->subsys_desc.name = "modem";
	drv->subsys_desc.dev = &pdev->dev;
	drv->subsys_desc.owner = THIS_MODULE;
	drv->subsys_desc.shutdown = modem_shutdown;
	drv->subsys_desc.powerup = modem_powerup;
	drv->subsys_desc.ramdump = modem_ramdump;
	drv->subsys_desc.free_memory = modem_free_memory;
	drv->subsys_desc.crash_shutdown = modem_crash_shutdown;
	drv->subsys_desc.err_fatal_handler = modem_err_fatal_intr_handler;
	drv->subsys_desc.stop_ack_handler = modem_stop_ack_intr_handler;
	drv->subsys_desc.wdog_bite_handler = modem_wdog_bite_intr_handler;

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

	drv->ramdump_dev = create_ramdump_device("modem", &pdev->dev);
	if (!drv->ramdump_dev) {
	pr_err("%s: Unable to create a modem ramdump device.\n",
	__func__);
	ret = -ENOMEM;
	goto err_ramdump;
	}

	return 0;

	err_ramdump:
	subsys_unregister(drv->subsys);
	err_subsys:
	return ret;
	}

	static int pil_mss_loadable_init(struct modem_data *drv,
	struct platform_device *pdev)
	{
	struct q6v5_data *q6;
	struct pil_desc *q6_desc;
	struct resource *res;
	struct property *prop;
	int ret;

	q6 = pil_q6v5_init(pdev);
	if (IS_ERR(q6))
	return PTR_ERR(q6);
	drv->q6 = q6;
	drv->xo = q6->xo;

	q6_desc = &q6->desc;
	q6_desc->owner = THIS_MODULE;
	q6_desc->proxy_timeout = PROXY_TIMEOUT_MS;

	q6_desc->ops = &pil_msa_mss_ops;

	q6->self_auth = of_property_read_bool(pdev->dev.of_node,
	"qcom,pil-self-auth");
	if (q6->self_auth) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"rmb_base");
	q6->rmb_base = devm_request_and_ioremap(&pdev->dev, res);
	if (!q6->rmb_base)
	return -ENOMEM;
	drv->rmb_base = q6->rmb_base;
	q6_desc->ops = &pil_msa_mss_ops_selfauth;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "restart_reg");
	if (!res) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"restart_reg_sec");
	q6->restart_reg_sec = true;
	}

	q6->restart_reg = devm_request_and_ioremap(&pdev->dev, res);
	if (!q6->restart_reg)
	return -ENOMEM;

	q6->vreg = NULL;

	prop = of_find_property(pdev->dev.of_node, "vdd_mss-supply", NULL);
	if (prop) {
	q6->vreg = devm_regulator_get(&pdev->dev, "vdd_mss");
	if (IS_ERR(q6->vreg))
	return PTR_ERR(q6->vreg);

	ret = regulator_set_voltage(q6->vreg, VDD_MSS_UV,
	MAX_VDD_MSS_UV);
	if (ret)
	dev_err(&pdev->dev, "Failed to set vreg voltage.\n");

	ret = regulator_set_optimum_mode(q6->vreg, 100000);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to set vreg mode.\n");
	return ret;
	}
	}

	q6->vreg_mx = devm_regulator_get(&pdev->dev, "vdd_mx");
	if (IS_ERR(q6->vreg_mx))
	return PTR_ERR(q6->vreg_mx);
	prop = of_find_property(pdev->dev.of_node, "vdd_mx-uV", NULL);
	if (!prop) {
	dev_err(&pdev->dev, "Missing vdd_mx-uV property\n");
	return -EINVAL;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"cxrail_bhs_reg");
	if (res)
	q6->cxrail_bhs = devm_ioremap(&pdev->dev, res->start,
	resource_size(res));

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

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

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

	/* Optional. */
	if (of_property_match_string(pdev->dev.of_node,
	"qcom,active-clock-names", "gpll0_mss_clk") >= 0)
	q6->gpll0_mss_clk = devm_clk_get(&pdev->dev, "gpll0_mss_clk");

	ret = pil_desc_init(q6_desc);

	return ret;
	}

	static int pil_mss_driver_probe(struct platform_device *pdev)
	{
	struct modem_data *drv;
	int ret, is_not_loadable;

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

	is_not_loadable = of_property_read_bool(pdev->dev.of_node,
	"qcom,is-not-loadable");
	if (is_not_loadable) {
	drv->subsys_desc.is_not_loadable = 1;
	} else {
	ret = pil_mss_loadable_init(drv, pdev);
	if (ret)
	return ret;
	}
	init_completion(&drv->stop_ack);

	return pil_subsys_init(drv, pdev);
	}

	static int pil_mss_driver_exit(struct platform_device *pdev)
	{
	struct modem_data *drv = platform_get_drvdata(pdev);

	subsys_unregister(drv->subsys);
	destroy_ramdump_device(drv->ramdump_dev);
	pil_desc_release(&drv->q6->desc);
	return 0;
	}

	static struct of_device_id mss_match_table[] = {
	{ .compatible = "qcom,pil-q6v5-mss" },
	{ .compatible = "qcom,pil-q6v55-mss" },
	{ .compatible = "qcom,pil-q6v56-mss" },
	{}
	};

	static struct platform_driver pil_mss_driver = {
	.probe = pil_mss_driver_probe,
	.remove = pil_mss_driver_exit,
	.driver = {
	.name = "pil-q6v5-mss",
	.of_match_table = mss_match_table,
	.owner = THIS_MODULE,
	},
	};

	static int __init pil_mss_init(void)
	{
	memset(modem_reset_reason, 0, sizeof(modem_reset_reason));
	snprintf(modem_reset_reason, MAX_SSR_REASON_LEN - 1,
	"%s", "No modem crash happened.");

	return platform_driver_register(&pil_mss_driver);
	}
	module_init(pil_mss_init);

	static void __exit pil_mss_exit(void)
	{
	platform_driver_unregister(&pil_mss_driver);
	}
	module_exit(pil_mss_exit);

	/*
	* /porc/modem_exception shows the times of modem crash and reason.
	*/

	static int modem_exception_proc_show(struct seq_file m, void v)
	{
	seq_printf(m, "[%d] %s\n", modem_reset_count, modem_reset_reason);
	return 0;
	}

	static int modem_exception_proc_open(struct inode inode, struct file file)
	{
	return single_open(file, modem_exception_proc_show, NULL);
	}

	static const struct file_operations modem_exception_proc_fops = {
	.open = modem_exception_proc_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int __init proc_modem_exception_init(void)
	{
	proc_create("modem_exception", 0, NULL, &modem_exception_proc_fops);
	return 0;
	}
	module_init(proc_modem_exception_init);


	MODULE_DESCRIPTION("Support for booting modem subsystems with QDSP6v5 Hexagon processors");
	MODULE_LICENSE("GPL v2");