[WATCHDOG] Add pnx833x_wdt (33c050c5) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/watchdog/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -729,6 +729,15 @@ config WDT_MTX1
		Hardware driver for the MTX-1 boards. This is a watchdog timer that
		will reboot the machine after a 100 seconds timer expired.

		config PNX833X_WDT
		tristate "PNX833x Hardware Watchdog"
		depends on SOC_PNX8335
		help
		Hardware driver for the PNX833x's watchdog. This is a
		watchdog timer that will reboot the machine after a programable
		timer has expired and no process has written to /dev/watchdog during
		that time.

		config WDT_RM9K_GPI
		tristate "RM9000/GPI hardware watchdog"
		depends on CPU_RM9000

drivers/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -101,6 +101,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
		obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
		obj-$(CONFIG_INDYDOG) += indydog.o
		obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
		obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
		obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
		obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
		obj-$(CONFIG_AR7_WDT) += ar7_wdt.o

drivers/watchdog/pnx833x_wdt.c

0 → 100644

+282 −0

Original line number	Diff line number	Diff line
		/*
		* PNX833x Hardware Watchdog Driver
		* Copyright 2008 NXP Semiconductors
		* Daniel Laird <daniel.j.laird@nxp.com>
		* Andre McCurdy <andre.mccurdy@nxp.com>
		*
		* Heavily based upon - IndyDog 0.3
		* A Hardware Watchdog Device for SGI IP22
		*
		* (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, 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
		* as published by the Free Software Foundation; either version
		* 2 of the License, or (at your option) any later version.
		*
		* based on softdog.c by Alan Cox <alan@redhat.com>
		*/

		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/types.h>
		#include <linux/kernel.h>
		#include <linux/fs.h>
		#include <linux/mm.h>
		#include <linux/miscdevice.h>
		#include <linux/watchdog.h>
		#include <linux/notifier.h>
		#include <linux/reboot.h>
		#include <linux/init.h>
		#include <asm/mach-pnx833x/pnx833x.h>

		#define PFX "pnx833x: "
		#define WATCHDOG_TIMEOUT 30 /* 30 sec Maximum timeout */
		#define WATCHDOG_COUNT_FREQUENCY 68000000U /* Watchdog counts at 68MHZ. */

		/** CONFIG block */
		#define PNX833X_CONFIG (0x07000U)
		#define PNX833X_CONFIG_CPU_WATCHDOG (0x54)
		#define PNX833X_CONFIG_CPU_WATCHDOG_COMPARE (0x58)
		#define PNX833X_CONFIG_CPU_COUNTERS_CONTROL (0x1c)

		/** RESET block */
		#define PNX833X_RESET (0x08000U)
		#define PNX833X_RESET_CONFIG (0x08)

		static int pnx833x_wdt_alive;

		/* Set default timeout in MHZ.*/
		static int pnx833x_wdt_timeout = (WATCHDOG_TIMEOUT * WATCHDOG_COUNT_FREQUENCY);
		module_param(pnx833x_wdt_timeout, int, 0);
		MODULE_PARM_DESC(timeout, "Watchdog timeout in Mhz. (68Mhz clock), default="
		__MODULE_STRING(pnx833x_wdt_timeout) "(30 seconds).");

		static int nowayout = WATCHDOG_NOWAYOUT;
		module_param(nowayout, int, 0);
		MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

		static int start_enabled = 1;
		module_param(start_enabled, int, 0);
		MODULE_PARM_DESC(start_enabled, "Watchdog is started on module insertion "
		"(default=" __MODULE_STRING(start_enabled) ")");

		static void pnx833x_wdt_start(void)
		{
		/* Enable watchdog causing reset. */
		PNX833X_REG(PNX833X_RESET + PNX833X_RESET_CONFIG) \|= 0x1;
		/* Set timeout.*/
		PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
		/* Enable watchdog. */
		PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_COUNTERS_CONTROL) \|= 0x1;

		printk(KERN_INFO PFX "Started watchdog timer.\n");
		}

		static void pnx833x_wdt_stop(void)
		{
		/* Disable watchdog causing reset. */
		PNX833X_REG(PNX833X_RESET + PNX833X_CONFIG) &= 0xFFFFFFFE;
		/* Disable watchdog.*/
		PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_COUNTERS_CONTROL) &= 0xFFFFFFFE;

		printk(KERN_INFO PFX "Stopped watchdog timer.\n");
		}

		static void pnx833x_wdt_ping(void)
		{
		PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
		}

		/*
		* Allow only one person to hold it open
		*/
		static int pnx833x_wdt_open(struct inode inode, struct file file)
		{
		if (test_and_set_bit(0, &pnx833x_wdt_alive))
		return -EBUSY;

		if (nowayout)
		__module_get(THIS_MODULE);

		/* Activate timer */
		if (!start_enabled)
		pnx833x_wdt_start();

		pnx833x_wdt_ping();

		printk(KERN_INFO "Started watchdog timer.\n");

		return nonseekable_open(inode, file);
		}

		static int pnx833x_wdt_release(struct inode inode, struct file file)
		{
		/* Shut off the timer.
		* Lock it in if it's a module and we defined ...NOWAYOUT */
		if (!nowayout)
		pnx833x_wdt_stop(); /* Turn the WDT off */

		clear_bit(0, &pnx833x_wdt_alive);
		return 0;
		}

		static ssize_t pnx833x_wdt_write(struct file file, const char data, size_t len, loff_t *ppos)
		{
		/* Refresh the timer. */
		if (len)
		pnx833x_wdt_ping();

		return len;
		}

		static long pnx833x_wdt_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
		{
		int options, new_timeout = 0;
		uint32_t timeout, timeout_left = 0;

		static struct watchdog_info ident = {
		.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT,
		.firmware_version = 0,
		.identity = "Hardware Watchdog for PNX833x",
		};

		switch (cmd) {
		default:
		return -ENOTTY;

		case WDIOC_GETSUPPORT:
		if (copy_to_user((struct watchdog_info *)arg,
		&ident, sizeof(ident)))
		return -EFAULT;
		return 0;

		case WDIOC_GETSTATUS:
		case WDIOC_GETBOOTSTATUS:
		return put_user(0, (int *)arg);

		case WDIOC_SETOPTIONS:
		if (get_user(options, (int *)arg))
		return -EFAULT;

		if (options & WDIOS_DISABLECARD)
		pnx833x_wdt_stop();

		if (options & WDIOS_ENABLECARD)
		pnx833x_wdt_start();

		return 0;

		case WDIOC_KEEPALIVE:
		pnx833x_wdt_ping();
		return 0;

		case WDIOC_SETTIMEOUT:
		{
		if (get_user(new_timeout, (int *)arg))
		return -EFAULT;

		pnx833x_wdt_timeout = new_timeout;
		PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = new_timeout;
		return put_user(new_timeout, (int *)arg);
		}

		case WDIOC_GETTIMEOUT:
		timeout = PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE);
		return put_user(timeout, (int *)arg);

		case WDIOC_GETTIMELEFT:
		timeout_left = PNX833X_REG(PNX833X_CONFIG +
		PNX833X_CONFIG_CPU_WATCHDOG);
		return put_user(timeout_left, (int *)arg);

		}
		}

		static int pnx833x_wdt_notify_sys(struct notifier_block *this,
		unsigned long code, void *unused)
		{
		if (code == SYS_DOWN \|\| code == SYS_HALT)
		pnx833x_wdt_stop(); /* Turn the WDT off */

		return NOTIFY_DONE;
		}

		static const struct file_operations pnx833x_wdt_fops = {
		.owner = THIS_MODULE,
		.llseek = no_llseek,
		.write = pnx833x_wdt_write,
		.unlocked_ioctl = pnx833x_wdt_ioctl,
		.open = pnx833x_wdt_open,
		.release = pnx833x_wdt_release,
		};

		static struct miscdevice pnx833x_wdt_miscdev = {
		.minor = WATCHDOG_MINOR,
		.name = "watchdog",
		.fops = &pnx833x_wdt_fops,
		};

		static struct notifier_block pnx833x_wdt_notifier = {
		.notifier_call = pnx833x_wdt_notify_sys,
		};

		static char banner[] __initdata =
		KERN_INFO PFX "Hardware Watchdog Timer for PNX833x: Version 0.1\n";

		static int __init watchdog_init(void)
		{
		int ret, cause;

		/* Lets check the reason for the reset.*/
		cause = PNX833X_REG(PNX833X_RESET);
		/If bit 31 is set then watchdog was cause of reset./
		if (cause & 0x80000000) {
		printk(KERN_INFO PFX "The system was previously reset due to "
		"the watchdog firing - please investigate...\n");
		}

		ret = register_reboot_notifier(&pnx833x_wdt_notifier);
		if (ret) {
		printk(KERN_ERR PFX
		"cannot register reboot notifier (err=%d)\n", ret);
		return ret;
		}

		ret = misc_register(&pnx833x_wdt_miscdev);
		if (ret) {
		printk(KERN_ERR PFX
		"cannot register miscdev on minor=%d (err=%d)\n",
		WATCHDOG_MINOR, ret);
		unregister_reboot_notifier(&pnx833x_wdt_notifier);
		return ret;
		}

		printk(banner);
		if (start_enabled)
		pnx833x_wdt_start();

		return 0;
		}

		static void __exit watchdog_exit(void)
		{
		misc_deregister(&pnx833x_wdt_miscdev);
		unregister_reboot_notifier(&pnx833x_wdt_notifier);
		}

		module_init(watchdog_init);
		module_exit(watchdog_exit);

		MODULE_AUTHOR("Daniel Laird/Andre McCurdy");
		MODULE_DESCRIPTION("Hardware Watchdog Device for PNX833x");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);