watchdog: sp5100_tco: Convert to use watchdog subsystem (7cd9d5ff) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/watchdog/sp5100_tco.c

+102 −256

Original line number	Diff line number	Diff line
		@@ -24,37 +24,31 @@

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/init.h>
		#include <linux/io.h>
		#include <linux/ioport.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/types.h>
		#include <linux/miscdevice.h>
		#include <linux/watchdog.h>
		#include <linux/init.h>
		#include <linux/fs.h>
		#include <linux/pci.h>
		#include <linux/ioport.h>
		#include <linux/platform_device.h>
		#include <linux/uaccess.h>
		#include <linux/io.h>
		#include <linux/types.h>
		#include <linux/watchdog.h>

		#include "sp5100_tco.h"

		/* Module and version information */
		#define TCO_VERSION "0.05"
		#define TCO_MODULE_NAME "SP5100 TCO timer"
		#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
		#define TCO_DRIVER_NAME "sp5100-tco"

		/* internal variables */
		static u32 tcobase_phys;
		static u32 tco_wdt_fired;
		static void __iomem *tcobase;
		static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
		static unsigned long timer_alive;
		static char tco_expect_close;
		static struct pci_dev *sp5100_tco_pci;

		struct sp5100_tco {
		struct watchdog_device wdd;
		void __iomem *tcobase;
		};

		/* the watchdog platform device */
		static struct platform_device *sp5100_tco_platform_device;
		/* the associated PCI device */
		static struct pci_dev *sp5100_tco_pci;

		/* module parameters */

		@@ -79,55 +73,52 @@ static bool tco_has_sp5100_reg_layout(struct pci_dev *dev)
		dev->revision < 0x40;
		}

		static void tco_timer_start(void)
		static int tco_timer_start(struct watchdog_device *wdd)
		{
		struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
		u32 val;
		unsigned long flags;

		spin_lock_irqsave(&tco_lock, flags);
		val = readl(SP5100_WDT_CONTROL(tcobase));
		val = readl(SP5100_WDT_CONTROL(tco->tcobase));
		val \|= SP5100_WDT_START_STOP_BIT;
		writel(val, SP5100_WDT_CONTROL(tcobase));
		spin_unlock_irqrestore(&tco_lock, flags);
		writel(val, SP5100_WDT_CONTROL(tco->tcobase));

		return 0;
		}

		static void tco_timer_stop(void)
		static int tco_timer_stop(struct watchdog_device *wdd)
		{
		struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
		u32 val;
		unsigned long flags;

		spin_lock_irqsave(&tco_lock, flags);
		val = readl(SP5100_WDT_CONTROL(tcobase));
		val = readl(SP5100_WDT_CONTROL(tco->tcobase));
		val &= ~SP5100_WDT_START_STOP_BIT;
		writel(val, SP5100_WDT_CONTROL(tcobase));
		spin_unlock_irqrestore(&tco_lock, flags);
		writel(val, SP5100_WDT_CONTROL(tco->tcobase));

		return 0;
		}

		static void tco_timer_keepalive(void)
		static int tco_timer_ping(struct watchdog_device *wdd)
		{
		struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
		u32 val;
		unsigned long flags;

		spin_lock_irqsave(&tco_lock, flags);
		val = readl(SP5100_WDT_CONTROL(tcobase));
		val = readl(SP5100_WDT_CONTROL(tco->tcobase));
		val \|= SP5100_WDT_TRIGGER_BIT;
		writel(val, SP5100_WDT_CONTROL(tcobase));
		spin_unlock_irqrestore(&tco_lock, flags);
		writel(val, SP5100_WDT_CONTROL(tco->tcobase));

		return 0;
		}

		static int tco_timer_set_heartbeat(int t)
		static int tco_timer_set_timeout(struct watchdog_device *wdd,
		unsigned int t)
		{
		unsigned long flags;

		if (t < 0 \|\| t > 0xffff)
		return -EINVAL;
		struct sp5100_tco *tco = watchdog_get_drvdata(wdd);

		/* Write new heartbeat to watchdog */
		spin_lock_irqsave(&tco_lock, flags);
		writel(t, SP5100_WDT_COUNT(tcobase));
		spin_unlock_irqrestore(&tco_lock, flags);
		writel(t, SP5100_WDT_COUNT(tco->tcobase));

		wdd->timeout = t;

		heartbeat = t;
		return 0;
		}

		@@ -182,137 +173,7 @@ static void tco_timer_enable(void)
		}
		}

		/*
		* /dev/watchdog handling
		*/

		static int sp5100_tco_open(struct inode inode, struct file file)
		{
		/* /dev/watchdog can only be opened once */
		if (test_and_set_bit(0, &timer_alive))
		return -EBUSY;

		/* Reload and activate timer */
		tco_timer_start();
		tco_timer_keepalive();
		return nonseekable_open(inode, file);
		}

		static int sp5100_tco_release(struct inode inode, struct file file)
		{
		/* Shut off the timer. */
		if (tco_expect_close == 42) {
		tco_timer_stop();
		} else {
		pr_crit("Unexpected close, not stopping watchdog!\n");
		tco_timer_keepalive();
		}
		clear_bit(0, &timer_alive);
		tco_expect_close = 0;
		return 0;
		}

		static ssize_t sp5100_tco_write(struct file file, const char __user data,
		size_t len, loff_t *ppos)
		{
		/* See if we got the magic character 'V' and reload the timer */
		if (len) {
		if (!nowayout) {
		size_t i;

		/* note: just in case someone wrote the magic character
		* five months ago... */
		tco_expect_close = 0;

		/* scan to see whether or not we got the magic character
		*/
		for (i = 0; i != len; i++) {
		char c;
		if (get_user(c, data + i))
		return -EFAULT;
		if (c == 'V')
		tco_expect_close = 42;
		}
		}

		/* someone wrote to us, we should reload the timer */
		tco_timer_keepalive();
		}
		return len;
		}

		static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
		{
		int new_options, retval = -EINVAL;
		int new_heartbeat;
		void __user argp = (void __user )arg;
		int __user *p = argp;
		static const struct watchdog_info ident = {
		.options = WDIOF_SETTIMEOUT \|
		WDIOF_KEEPALIVEPING \|
		WDIOF_MAGICCLOSE,
		.firmware_version = 0,
		.identity = TCO_MODULE_NAME,
		};

		switch (cmd) {
		case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident,
		sizeof(ident)) ? -EFAULT : 0;
		case WDIOC_GETSTATUS:
		case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
		case WDIOC_SETOPTIONS:
		if (get_user(new_options, p))
		return -EFAULT;
		if (new_options & WDIOS_DISABLECARD) {
		tco_timer_stop();
		retval = 0;
		}
		if (new_options & WDIOS_ENABLECARD) {
		tco_timer_start();
		tco_timer_keepalive();
		retval = 0;
		}
		return retval;
		case WDIOC_KEEPALIVE:
		tco_timer_keepalive();
		return 0;
		case WDIOC_SETTIMEOUT:
		if (get_user(new_heartbeat, p))
		return -EFAULT;
		if (tco_timer_set_heartbeat(new_heartbeat))
		return -EINVAL;
		tco_timer_keepalive();
		/* Fall through */
		case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, p);
		default:
		return -ENOTTY;
		}
		}

		/*
		* Kernel Interfaces
		*/

		static const struct file_operations sp5100_tco_fops = {
		.owner = THIS_MODULE,
		.llseek = no_llseek,
		.write = sp5100_tco_write,
		.unlocked_ioctl = sp5100_tco_ioctl,
		.open = sp5100_tco_open,
		.release = sp5100_tco_release,
		};

		static struct miscdevice sp5100_tco_miscdev = {
		.minor = WATCHDOG_MINOR,
		.name = "watchdog",
		.fops = &sp5100_tco_fops,
		};

		static u8 sp5100_tco_read_pm_reg32(u8 index)
		static u32 sp5100_tco_read_pm_reg32(u8 index)
		{
		u32 val = 0;
		int i;
		@@ -323,14 +184,13 @@ static u8 sp5100_tco_read_pm_reg32(u8 index)
		return val;
		}

		/*
		* Init & exit routines
		*/
		static int sp5100_tco_setupdevice(struct device *dev)
		static int sp5100_tco_setupdevice(struct device *dev,
		struct watchdog_device *wdd)
		{
		const char *dev_name = NULL;
		u32 val;
		struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
		const char *dev_name;
		u8 base_addr;
		u32 val;
		int ret;

		/*
		@@ -361,7 +221,7 @@ static int sp5100_tco_setupdevice(struct device *dev)
		dev_dbg(dev, "Got 0x%04x from indirect I/O\n", val);

		/* Check MMIO address conflict */
		if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
		if (!devm_request_mem_region(dev, val, SP5100_WDT_MEM_MAP_SIZE,
		dev_name)) {
		dev_dbg(dev, "MMIO address 0x%04x already in use\n", val);
		/*
		@@ -391,7 +251,7 @@ static int sp5100_tco_setupdevice(struct device *dev)
		/* Add the Watchdog Timer offset to base address. */
		val += SB800_PM_WDT_MMIO_OFFSET;
		/* Check MMIO address conflict */
		if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
		if (!devm_request_mem_region(dev, val, SP5100_WDT_MEM_MAP_SIZE,
		dev_name)) {
		dev_dbg(dev, "MMIO address 0x%04x already in use\n",
		val);
		@@ -401,13 +261,11 @@ static int sp5100_tco_setupdevice(struct device *dev)
		dev_dbg(dev, "Got 0x%04x from SBResource_MMIO register\n", val);
		}

		tcobase_phys = val;

		tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
		if (!tcobase) {
		tco->tcobase = devm_ioremap(dev, val, SP5100_WDT_MEM_MAP_SIZE);
		if (!tco->tcobase) {
		dev_err(dev, "failed to get tcobase address\n");
		ret = -ENOMEM;
		goto unreg_mem_region;
		goto unreg_region;
		}

		dev_info(dev, "Using 0x%04x for watchdog MMIO address\n", val);
		@@ -416,107 +274,95 @@ static int sp5100_tco_setupdevice(struct device *dev)
		tco_timer_enable();

		/* Check that the watchdog action is set to reset the system */
		val = readl(SP5100_WDT_CONTROL(tcobase));
		val = readl(SP5100_WDT_CONTROL(tco->tcobase));
		/*
		* Save WatchDogFired status, because WatchDogFired flag is
		* cleared here.
		*/
		tco_wdt_fired = val & SP5100_WDT_FIRED;
		if (val & SP5100_WDT_FIRED)
		wdd->bootstatus = WDIOF_CARDRESET;
		val &= ~SP5100_WDT_ACTION_RESET;
		writel(val, SP5100_WDT_CONTROL(tcobase));
		writel(val, SP5100_WDT_CONTROL(tco->tcobase));

		/* Set a reasonable heartbeat before we stop the timer */
		tco_timer_set_heartbeat(heartbeat);
		tco_timer_set_timeout(wdd, wdd->timeout);

		/*
		* Stop the TCO before we change anything so we don't race with
		* a zeroed timer.
		*/
		tco_timer_stop();
		tco_timer_stop(wdd);

		release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);

		return 0;

		unreg_mem_region:
		release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
		unreg_region:
		release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
		return ret;
		}

		static struct watchdog_info sp5100_tco_wdt_info = {
		.identity = "SP5100 TCO timer",
		.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
		};

		static const struct watchdog_ops sp5100_tco_wdt_ops = {
		.owner = THIS_MODULE,
		.start = tco_timer_start,
		.stop = tco_timer_stop,
		.ping = tco_timer_ping,
		.set_timeout = tco_timer_set_timeout,
		};

		static int sp5100_tco_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct watchdog_device *wdd;
		struct sp5100_tco *tco;
		int ret;

		/*
		* Check whether or not the hardware watchdog is there. If found, then
		* set it up.
		*/
		ret = sp5100_tco_setupdevice(dev);
		tco = devm_kzalloc(dev, sizeof(*tco), GFP_KERNEL);
		if (!tco)
		return -ENOMEM;

		wdd = &tco->wdd;
		wdd->parent = dev;
		wdd->info = &sp5100_tco_wdt_info;
		wdd->ops = &sp5100_tco_wdt_ops;
		wdd->timeout = WATCHDOG_HEARTBEAT;
		wdd->min_timeout = 1;
		wdd->max_timeout = 0xffff;

		if (watchdog_init_timeout(wdd, heartbeat, NULL))
		dev_info(dev, "timeout value invalid, using %d\n",
		wdd->timeout);
		watchdog_set_nowayout(wdd, nowayout);
		watchdog_stop_on_reboot(wdd);
		watchdog_stop_on_unregister(wdd);
		watchdog_set_drvdata(wdd, tco);

		ret = sp5100_tco_setupdevice(dev, wdd);
		if (ret)
		return ret;

		/* Check to see if last reboot was due to watchdog timeout */
		dev_info(dev, "Last reboot was %striggered by watchdog.\n",
		tco_wdt_fired ? "" : "not ");

		/*
		* Check that the heartbeat value is within it's range.
		* If not, reset to the default.
		*/
		if (tco_timer_set_heartbeat(heartbeat)) {
		heartbeat = WATCHDOG_HEARTBEAT;
		tco_timer_set_heartbeat(heartbeat);
		}

		ret = misc_register(&sp5100_tco_miscdev);
		if (ret != 0) {
		dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
		WATCHDOG_MINOR, ret);
		goto exit;
		}

		clear_bit(0, &timer_alive);

		/* Show module parameters */
		dev_info(dev, "initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
		tcobase, heartbeat, nowayout);

		return 0;

		exit:
		iounmap(tcobase);
		release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
		ret = devm_watchdog_register_device(dev, wdd);
		if (ret) {
		dev_err(dev, "cannot register watchdog device (err=%d)\n", ret);
		return ret;
		}

		static int sp5100_tco_remove(struct platform_device *pdev)
		{
		/* Stop the timer before we leave */
		if (!nowayout)
		tco_timer_stop();

		/* Deregister */
		misc_deregister(&sp5100_tco_miscdev);
		iounmap(tcobase);
		release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
		/* Show module parameters */
		dev_info(dev, "initialized. heartbeat=%d sec (nowayout=%d)\n",
		wdd->timeout, nowayout);

		return 0;
		}

		static void sp5100_tco_shutdown(struct platform_device *pdev)
		{
		tco_timer_stop();
		}

		static struct platform_driver sp5100_tco_driver = {
		.probe = sp5100_tco_probe,
		.remove = sp5100_tco_remove,
		.shutdown = sp5100_tco_shutdown,
		.driver = {
		.name = TCO_MODULE_NAME,
		.name = TCO_DRIVER_NAME,
		},
		};

		@@ -555,14 +401,14 @@ static int __init sp5100_tco_init(void)
		if (!sp5100_tco_pci)
		return -ENODEV;

		pr_info("SP5100/SB800 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
		pr_info("SP5100/SB800 TCO WatchDog Timer Driver\n");

		err = platform_driver_register(&sp5100_tco_driver);
		if (err)
		return err;

		sp5100_tco_platform_device = platform_device_register_simple(
		TCO_MODULE_NAME, -1, NULL, 0);
		sp5100_tco_platform_device =
		platform_device_register_simple(TCO_DRIVER_NAME, -1, NULL, 0);
		if (IS_ERR(sp5100_tco_platform_device)) {
		err = PTR_ERR(sp5100_tco_platform_device);
		goto unreg_platform_driver;