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watchdog: imx2_wdt: convert to watchdog core api
Convert the imx2_wdt driver to the new watchdog core api. Signed-off-by: Anatolij Gustschin <agust@denx.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Cc: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Anatolij Gustschin
Wim Van Sebroeck
parent
a797700329
commit
faad5de0b1
@ -379,6 +379,7 @@ config IMX2_WDT
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tristate "IMX2+ Watchdog"
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depends on ARCH_MXC
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select REGMAP_MMIO
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select WATCHDOG_CORE
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help
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This is the driver for the hardware watchdog
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on the Freescale IMX2 and later processors.
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@ -22,18 +22,15 @@
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*/
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#include <linux/clk.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/timer.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#define DRIVER_NAME "imx2-wdt"
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@ -56,19 +53,12 @@
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#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
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#define IMX2_WDT_STATUS_OPEN 0
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#define IMX2_WDT_STATUS_STARTED 1
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#define IMX2_WDT_EXPECT_CLOSE 2
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static struct {
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struct imx2_wdt_device {
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struct clk *clk;
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struct regmap *regmap;
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unsigned timeout;
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unsigned long status;
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struct timer_list timer; /* Pings the watchdog when closed */
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} imx2_wdt;
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static struct miscdevice imx2_wdt_miscdev;
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struct watchdog_device wdog;
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};
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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@ -86,11 +76,12 @@ static const struct watchdog_info imx2_wdt_info = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
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};
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static inline void imx2_wdt_setup(void)
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static inline void imx2_wdt_setup(struct watchdog_device *wdog)
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{
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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u32 val;
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regmap_read(imx2_wdt.regmap, IMX2_WDT_WCR, &val);
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regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
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/* Suspend timer in low power mode, write once-only */
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val |= IMX2_WDT_WCR_WDZST;
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@ -101,157 +92,93 @@ static inline void imx2_wdt_setup(void)
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/* Keep Watchdog Disabled */
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val &= ~IMX2_WDT_WCR_WDE;
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/* Set the watchdog's Time-Out value */
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val |= WDOG_SEC_TO_COUNT(imx2_wdt.timeout);
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val |= WDOG_SEC_TO_COUNT(wdog->timeout);
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regmap_write(imx2_wdt.regmap, IMX2_WDT_WCR, val);
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regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
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/* enable the watchdog */
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val |= IMX2_WDT_WCR_WDE;
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regmap_write(imx2_wdt.regmap, IMX2_WDT_WCR, val);
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regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
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}
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static inline void imx2_wdt_ping(void)
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static inline bool imx2_wdt_is_running(struct imx2_wdt_device *wdev)
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{
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regmap_write(imx2_wdt.regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1);
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regmap_write(imx2_wdt.regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2);
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u32 val;
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regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
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return val & IMX2_WDT_WCR_WDE;
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}
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static int imx2_wdt_ping(struct watchdog_device *wdog)
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{
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1);
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regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2);
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return 0;
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}
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static void imx2_wdt_timer_ping(unsigned long arg)
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{
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/* ping it every imx2_wdt.timeout / 2 seconds to prevent reboot */
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imx2_wdt_ping();
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mod_timer(&imx2_wdt.timer, jiffies + imx2_wdt.timeout * HZ / 2);
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struct watchdog_device *wdog = (struct watchdog_device *)arg;
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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/* ping it every wdog->timeout / 2 seconds to prevent reboot */
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imx2_wdt_ping(wdog);
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mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
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}
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static void imx2_wdt_start(void)
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static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
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unsigned int new_timeout)
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{
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if (!test_and_set_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) {
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/* at our first start we enable clock and do initialisations */
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clk_prepare_enable(imx2_wdt.clk);
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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imx2_wdt_setup();
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} else /* delete the timer that pings the watchdog after close */
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del_timer_sync(&imx2_wdt.timer);
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/* Watchdog is enabled - time to reload the timeout value */
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imx2_wdt_ping();
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}
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static void imx2_wdt_stop(void)
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{
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/* we don't need a clk_disable, it cannot be disabled once started.
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* We use a timer to ping the watchdog while /dev/watchdog is closed */
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imx2_wdt_timer_ping(0);
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}
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static void imx2_wdt_set_timeout(int new_timeout)
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{
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regmap_update_bits(imx2_wdt.regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT,
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regmap_update_bits(wdev->regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT,
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WDOG_SEC_TO_COUNT(new_timeout));
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}
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static int imx2_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(IMX2_WDT_STATUS_OPEN, &imx2_wdt.status))
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return -EBUSY;
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imx2_wdt_start();
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return nonseekable_open(inode, file);
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}
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static int imx2_wdt_close(struct inode *inode, struct file *file)
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{
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if (test_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status) && !nowayout)
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imx2_wdt_stop();
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else {
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dev_crit(imx2_wdt_miscdev.parent,
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"Unexpected close: Expect reboot!\n");
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imx2_wdt_ping();
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}
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clear_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status);
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clear_bit(IMX2_WDT_STATUS_OPEN, &imx2_wdt.status);
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return 0;
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}
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static long imx2_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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static int imx2_wdt_start(struct watchdog_device *wdog)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_value;
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u32 val;
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &imx2_wdt_info,
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sizeof(struct watchdog_info)) ? -EFAULT : 0;
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if (imx2_wdt_is_running(wdev)) {
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/* delete the timer that pings the watchdog after close */
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del_timer_sync(&wdev->timer);
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imx2_wdt_set_timeout(wdog, wdog->timeout);
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} else
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imx2_wdt_setup(wdog);
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case WDIOC_GETSTATUS:
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return put_user(0, p);
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return imx2_wdt_ping(wdog);
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}
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case WDIOC_GETBOOTSTATUS:
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regmap_read(imx2_wdt.regmap, IMX2_WDT_WRSR, &val);
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new_value = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
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return put_user(new_value, p);
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static int imx2_wdt_stop(struct watchdog_device *wdog)
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{
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/*
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* We don't need a clk_disable, it cannot be disabled once started.
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* We use a timer to ping the watchdog while /dev/watchdog is closed
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*/
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imx2_wdt_timer_ping((unsigned long)wdog);
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return 0;
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}
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case WDIOC_KEEPALIVE:
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imx2_wdt_ping();
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return 0;
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static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog)
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{
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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case WDIOC_SETTIMEOUT:
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if (get_user(new_value, p))
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return -EFAULT;
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if ((new_value < 1) || (new_value > IMX2_WDT_MAX_TIME))
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return -EINVAL;
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imx2_wdt_set_timeout(new_value);
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imx2_wdt.timeout = new_value;
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imx2_wdt_ping();
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/* Fallthrough to return current value */
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case WDIOC_GETTIMEOUT:
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return put_user(imx2_wdt.timeout, p);
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default:
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return -ENOTTY;
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if (imx2_wdt_is_running(wdev)) {
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imx2_wdt_set_timeout(wdog, wdog->timeout);
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imx2_wdt_timer_ping((unsigned long)wdog);
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}
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}
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static ssize_t imx2_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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size_t i;
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char c;
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if (len == 0) /* Can we see this even ? */
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return 0;
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clear_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status);
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/* scan to see whether or not we got the magic character */
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for (i = 0; i != len; i++) {
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status);
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}
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imx2_wdt_ping();
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return len;
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}
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static const struct file_operations imx2_wdt_fops = {
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static struct watchdog_ops imx2_wdt_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.unlocked_ioctl = imx2_wdt_ioctl,
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.open = imx2_wdt_open,
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.release = imx2_wdt_close,
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.write = imx2_wdt_write,
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};
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static struct miscdevice imx2_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &imx2_wdt_fops,
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.start = imx2_wdt_start,
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.stop = imx2_wdt_stop,
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.ping = imx2_wdt_ping,
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.set_timeout = imx2_wdt_set_timeout,
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};
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static struct regmap_config imx2_wdt_regmap_config = {
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@ -263,76 +190,101 @@ static struct regmap_config imx2_wdt_regmap_config = {
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static int __init imx2_wdt_probe(struct platform_device *pdev)
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{
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struct imx2_wdt_device *wdev;
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struct watchdog_device *wdog;
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struct resource *res;
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void __iomem *base;
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int ret;
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u32 val;
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wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
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if (!wdev)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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imx2_wdt.regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
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&imx2_wdt_regmap_config);
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if (IS_ERR(imx2_wdt.regmap)) {
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wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
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&imx2_wdt_regmap_config);
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if (IS_ERR(wdev->regmap)) {
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dev_err(&pdev->dev, "regmap init failed\n");
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return PTR_ERR(imx2_wdt.regmap);
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return PTR_ERR(wdev->regmap);
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}
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imx2_wdt.clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(imx2_wdt.clk)) {
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wdev->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(wdev->clk)) {
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dev_err(&pdev->dev, "can't get Watchdog clock\n");
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return PTR_ERR(imx2_wdt.clk);
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return PTR_ERR(wdev->clk);
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}
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imx2_wdt.timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME);
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if (imx2_wdt.timeout != timeout)
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dev_warn(&pdev->dev, "Initial timeout out of range! "
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"Clamped from %u to %u\n", timeout, imx2_wdt.timeout);
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wdog = &wdev->wdog;
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wdog->info = &imx2_wdt_info;
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wdog->ops = &imx2_wdt_ops;
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wdog->min_timeout = 1;
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wdog->max_timeout = IMX2_WDT_MAX_TIME;
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setup_timer(&imx2_wdt.timer, imx2_wdt_timer_ping, 0);
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clk_prepare_enable(wdev->clk);
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imx2_wdt_miscdev.parent = &pdev->dev;
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ret = misc_register(&imx2_wdt_miscdev);
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if (ret)
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goto fail;
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regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
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wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
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wdog->timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME);
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if (wdog->timeout != timeout)
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dev_warn(&pdev->dev, "Initial timeout out of range! Clamped from %u to %u\n",
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timeout, wdog->timeout);
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platform_set_drvdata(pdev, wdog);
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watchdog_set_drvdata(wdog, wdev);
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watchdog_set_nowayout(wdog, nowayout);
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watchdog_init_timeout(wdog, timeout, &pdev->dev);
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setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
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imx2_wdt_ping_if_active(wdog);
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ret = watchdog_register_device(wdog);
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if (ret) {
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dev_err(&pdev->dev, "cannot register watchdog device\n");
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return ret;
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}
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dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
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wdog->timeout, nowayout);
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dev_info(&pdev->dev,
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"IMX2+ Watchdog Timer enabled. timeout=%ds (nowayout=%d)\n",
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imx2_wdt.timeout, nowayout);
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return 0;
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fail:
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imx2_wdt_miscdev.parent = NULL;
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return ret;
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}
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static int __exit imx2_wdt_remove(struct platform_device *pdev)
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{
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misc_deregister(&imx2_wdt_miscdev);
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struct watchdog_device *wdog = platform_get_drvdata(pdev);
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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if (test_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) {
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del_timer_sync(&imx2_wdt.timer);
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watchdog_unregister_device(wdog);
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dev_crit(imx2_wdt_miscdev.parent,
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"Device removed: Expect reboot!\n");
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if (imx2_wdt_is_running(wdev)) {
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del_timer_sync(&wdev->timer);
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imx2_wdt_ping(wdog);
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dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
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}
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imx2_wdt_miscdev.parent = NULL;
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return 0;
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}
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static void imx2_wdt_shutdown(struct platform_device *pdev)
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{
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if (test_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) {
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/* we are running, we need to delete the timer but will give
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* max timeout before reboot will take place */
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del_timer_sync(&imx2_wdt.timer);
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imx2_wdt_set_timeout(IMX2_WDT_MAX_TIME);
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imx2_wdt_ping();
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struct watchdog_device *wdog = platform_get_drvdata(pdev);
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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dev_crit(imx2_wdt_miscdev.parent,
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"Device shutdown: Expect reboot!\n");
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if (imx2_wdt_is_running(wdev)) {
|
||||
/*
|
||||
* We are running, we need to delete the timer but will
|
||||
* give max timeout before reboot will take place
|
||||
*/
|
||||
del_timer_sync(&wdev->timer);
|
||||
imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
|
||||
imx2_wdt_ping(wdog);
|
||||
dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user