watchdog: remove ks8695 driver (a65f506f) · Commits · e / devices / android_kernel_fairphone_FP5

Documentation/watchdog/watchdog-parameters.rst

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		@@ -301,15 +301,6 @@ ixp4xx_wdt:

		-------------------------------------------------

		ks8695_wdt:
		wdt_time:
		Watchdog time in seconds. (default=5)
		nowayout:
		Watchdog cannot be stopped once started
		(default=kernel config parameter)

		-------------------------------------------------

		machzwd:
		nowayout:
		Watchdog cannot be stopped once started

drivers/watchdog/Kconfig

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		@@ -477,13 +477,6 @@ config IXP4XX_WATCHDOG

		Say N if you are unsure.

		config KS8695_WATCHDOG
		tristate "KS8695 watchdog"
		depends on ARCH_KS8695
		help
		Watchdog timer embedded into KS8695 processor. This will reboot your
		system when the timeout is reached.

		config HAVE_S3C2410_WATCHDOG
		bool
		help

drivers/watchdog/Makefile

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		@@ -49,7 +49,6 @@ obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
		obj-$(CONFIG_977_WATCHDOG) += wdt977.o
		obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
		obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
		obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
		obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
		obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
		obj-$(CONFIG_SAMA5D4_WATCHDOG) += sama5d4_wdt.o

drivers/watchdog/ks8695_wdt.c

deleted100644 → 0

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		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* Watchdog driver for Kendin/Micrel KS8695.
		*
		* (C) 2007 Andrew Victor
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/bitops.h>
		#include <linux/errno.h>
		#include <linux/fs.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/miscdevice.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/platform_device.h>
		#include <linux/types.h>
		#include <linux/watchdog.h>
		#include <linux/io.h>
		#include <linux/uaccess.h>
		#include <mach/hardware.h>

		#define KS8695_TMR_OFFSET (0xF0000 + 0xE400)
		#define KS8695_TMR_VA (KS8695_IO_VA + KS8695_TMR_OFFSET)

		/*
		* Timer registers
		*/
		#define KS8695_TMCON (0x00) /* Timer Control Register */
		#define KS8695_T0TC (0x08) /* Timer 0 Timeout Count Register */
		#define TMCON_T0EN (1 << 0) /* Timer 0 Enable */

		/* Timer0 Timeout Counter Register */
		#define T0TC_WATCHDOG (0xff) /* Enable watchdog mode */

		#define WDT_DEFAULT_TIME 5 /* seconds */
		#define WDT_MAX_TIME 171 /* seconds */

		static int wdt_time = WDT_DEFAULT_TIME;
		static bool nowayout = WATCHDOG_NOWAYOUT;

		module_param(wdt_time, int, 0);
		MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
		__MODULE_STRING(WDT_DEFAULT_TIME) ")");

		#ifdef CONFIG_WATCHDOG_NOWAYOUT
		module_param(nowayout, bool, 0);
		MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
		#endif


		static unsigned long ks8695wdt_busy;
		static DEFINE_SPINLOCK(ks8695_lock);

		/* ......................................................................... */

		/*
		* Disable the watchdog.
		*/
		static inline void ks8695_wdt_stop(void)
		{
		unsigned long tmcon;

		spin_lock(&ks8695_lock);
		/* disable timer0 */
		tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
		__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
		spin_unlock(&ks8695_lock);
		}

		/*
		* Enable and reset the watchdog.
		*/
		static inline void ks8695_wdt_start(void)
		{
		unsigned long tmcon;
		unsigned long tval = wdt_time * KS8695_CLOCK_RATE;

		spin_lock(&ks8695_lock);
		/* disable timer0 */
		tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
		__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);

		/* program timer0 */
		__raw_writel(tval \| T0TC_WATCHDOG, KS8695_TMR_VA + KS8695_T0TC);

		/* re-enable timer0 */
		tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
		__raw_writel(tmcon \| TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
		spin_unlock(&ks8695_lock);
		}

		/*
		* Reload the watchdog timer. (ie, pat the watchdog)
		*/
		static inline void ks8695_wdt_reload(void)
		{
		unsigned long tmcon;

		spin_lock(&ks8695_lock);
		/* disable, then re-enable timer0 */
		tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
		__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
		__raw_writel(tmcon \| TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
		spin_unlock(&ks8695_lock);
		}

		/*
		* Change the watchdog time interval.
		*/
		static int ks8695_wdt_settimeout(int new_time)
		{
		/*
		* All counting occurs at KS8695_CLOCK_RATE / 128 = 0.256 Hz
		*
		* Since WDV is a 16-bit counter, the maximum period is
		* 65536 / 0.256 = 256 seconds.
		*/
		if ((new_time <= 0) \|\| (new_time > WDT_MAX_TIME))
		return -EINVAL;

		/* Set new watchdog time. It will be used when
		ks8695_wdt_start() is called. */
		wdt_time = new_time;
		return 0;
		}

		/* ......................................................................... */

		/*
		* Watchdog device is opened, and watchdog starts running.
		*/
		static int ks8695_wdt_open(struct inode inode, struct file file)
		{
		if (test_and_set_bit(0, &ks8695wdt_busy))
		return -EBUSY;

		ks8695_wdt_start();
		return stream_open(inode, file);
		}

		/*
		* Close the watchdog device.
		* If CONFIG_WATCHDOG_NOWAYOUT is NOT defined then the watchdog is also
		* disabled.
		*/
		static int ks8695_wdt_close(struct inode inode, struct file file)
		{
		/* Disable the watchdog when file is closed */
		if (!nowayout)
		ks8695_wdt_stop();
		clear_bit(0, &ks8695wdt_busy);
		return 0;
		}

		static const struct watchdog_info ks8695_wdt_info = {
		.identity = "ks8695 watchdog",
		.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING,
		};

		/*
		* Handle commands from user-space.
		*/
		static long ks8695_wdt_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
		{
		void __user argp = (void __user )arg;
		int __user *p = argp;
		int new_value;

		switch (cmd) {
		case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ks8695_wdt_info,
		sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
		case WDIOC_GETSTATUS:
		case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
		case WDIOC_SETOPTIONS:
		if (get_user(new_value, p))
		return -EFAULT;
		if (new_value & WDIOS_DISABLECARD)
		ks8695_wdt_stop();
		if (new_value & WDIOS_ENABLECARD)
		ks8695_wdt_start();
		return 0;
		case WDIOC_KEEPALIVE:
		ks8695_wdt_reload(); /* pat the watchdog */
		return 0;
		case WDIOC_SETTIMEOUT:
		if (get_user(new_value, p))
		return -EFAULT;
		if (ks8695_wdt_settimeout(new_value))
		return -EINVAL;
		/* Enable new time value */
		ks8695_wdt_start();
		/* Return current value */
		return put_user(wdt_time, p);
		case WDIOC_GETTIMEOUT:
		return put_user(wdt_time, p);
		default:
		return -ENOTTY;
		}
		}

		/*
		* Pat the watchdog whenever device is written to.
		*/
		static ssize_t ks8695_wdt_write(struct file file, const char data,
		size_t len, loff_t *ppos)
		{
		ks8695_wdt_reload(); /* pat the watchdog */
		return len;
		}

		/* ......................................................................... */

		static const struct file_operations ks8695wdt_fops = {
		.owner = THIS_MODULE,
		.llseek = no_llseek,
		.unlocked_ioctl = ks8695_wdt_ioctl,
		.open = ks8695_wdt_open,
		.release = ks8695_wdt_close,
		.write = ks8695_wdt_write,
		};

		static struct miscdevice ks8695wdt_miscdev = {
		.minor = WATCHDOG_MINOR,
		.name = "watchdog",
		.fops = &ks8695wdt_fops,
		};

		static int ks8695wdt_probe(struct platform_device *pdev)
		{
		int res;

		if (ks8695wdt_miscdev.parent)
		return -EBUSY;
		ks8695wdt_miscdev.parent = &pdev->dev;

		res = misc_register(&ks8695wdt_miscdev);
		if (res)
		return res;

		pr_info("KS8695 Watchdog Timer enabled (%d seconds%s)\n",
		wdt_time, nowayout ? ", nowayout" : "");
		return 0;
		}

		static int ks8695wdt_remove(struct platform_device *pdev)
		{
		misc_deregister(&ks8695wdt_miscdev);
		ks8695wdt_miscdev.parent = NULL;

		return 0;
		}

		static void ks8695wdt_shutdown(struct platform_device *pdev)
		{
		ks8695_wdt_stop();
		}

		#ifdef CONFIG_PM

		static int ks8695wdt_suspend(struct platform_device *pdev, pm_message_t message)
		{
		ks8695_wdt_stop();
		return 0;
		}

		static int ks8695wdt_resume(struct platform_device *pdev)
		{
		if (ks8695wdt_busy)
		ks8695_wdt_start();
		return 0;
		}

		#else
		#define ks8695wdt_suspend NULL
		#define ks8695wdt_resume NULL
		#endif

		static struct platform_driver ks8695wdt_driver = {
		.probe = ks8695wdt_probe,
		.remove = ks8695wdt_remove,
		.shutdown = ks8695wdt_shutdown,
		.suspend = ks8695wdt_suspend,
		.resume = ks8695wdt_resume,
		.driver = {
		.name = "ks8695_wdt",
		},
		};

		static int __init ks8695_wdt_init(void)
		{
		/* Check that the heartbeat value is within range;
		if not reset to the default */
		if (ks8695_wdt_settimeout(wdt_time)) {
		ks8695_wdt_settimeout(WDT_DEFAULT_TIME);
		pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i"
		", using %d\n", wdt_time, WDT_MAX_TIME);
		}
		return platform_driver_register(&ks8695wdt_driver);
		}

		static void __exit ks8695_wdt_exit(void)
		{
		platform_driver_unregister(&ks8695wdt_driver);
		}

		module_init(ks8695_wdt_init);
		module_exit(ks8695_wdt_exit);

		MODULE_AUTHOR("Andrew Victor");
		MODULE_DESCRIPTION("Watchdog driver for KS8695");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:ks8695_wdt");