1 files changed, 93 insertions, 213 deletions

diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c
index 93958a7763e6..e5b59bebcdb1 100644
--- a/drivers/watchdog/shwdt.c
+++ b/drivers/watchdog/shwdt.c
@@ -3,7 +3,7 @@
  *
  * Watchdog driver for integrated watchdog in the SuperH processors.
  *
- * Copyright (C) 2001 - 2010  Paul Mundt <lethal@linux-sh.org>
+ * Copyright (C) 2001 - 2012  Paul Mundt <lethal@linux-sh.org>
  *
  * 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
@@ -25,16 +25,15 @@
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/spinlock.h>
 #include <linux/miscdevice.h>
 #include <linux/watchdog.h>
-#include <linux/reboot.h>
-#include <linux/notifier.h>
-#include <linux/ioport.h>
+#include <linux/pm_runtime.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/io.h>
-#include <linux/uaccess.h>
+#include <linux/clk.h>
 #include <asm/watchdog.h>
 
 #define DRV_NAME "sh-wdt"
@@ -69,10 +68,6 @@
 static int clock_division_ratio = WTCSR_CKS_4096;
 #define next_ping_period(cks)   (jiffies + msecs_to_jiffies(cks - 4))
 
-static const struct watchdog_info sh_wdt_info;
-static struct platform_device *sh_wdt_dev;
-static DEFINE_SPINLOCK(shwdt_lock);
-
 #define WATCHDOG_HEARTBEAT 30                   /* 30 sec default heartbeat */
 static int heartbeat = WATCHDOG_HEARTBEAT;      /* in seconds */
 static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -81,19 +76,22 @@ static unsigned long next_heartbeat;
 struct sh_wdt {
         void __iomem            *base;
         struct device           *dev;
+        struct clk              *clk;
+        spinlock_t              lock;
 
         struct timer_list       timer;
-
-        unsigned long           enabled;
-        char                    expect_close;
 };
 
-static void sh_wdt_start(struct sh_wdt *wdt)
+static int sh_wdt_start(struct watchdog_device *wdt_dev)
 {
+        struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
         unsigned long flags;
         u8 csr;
 
-        spin_lock_irqsave(&shwdt_lock, flags);
+        pm_runtime_get_sync(wdt->dev);
+        clk_enable(wdt->clk);
+
+        spin_lock_irqsave(&wdt->lock, flags);
 
         next_heartbeat = jiffies + (heartbeat * HZ);
         mod_timer(&wdt->timer, next_ping_period(clock_division_ratio));
@@ -122,15 +120,18 @@ static void sh_wdt_start(struct sh_wdt *wdt)
         csr &= ~RSTCSR_RSTS;
         sh_wdt_write_rstcsr(csr);
 #endif
-        spin_unlock_irqrestore(&shwdt_lock, flags);
+        spin_unlock_irqrestore(&wdt->lock, flags);
+
+        return 0;
 }
 
-static void sh_wdt_stop(struct sh_wdt *wdt)
+static int sh_wdt_stop(struct watchdog_device *wdt_dev)
 {
+        struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
         unsigned long flags;
         u8 csr;
 
-        spin_lock_irqsave(&shwdt_lock, flags);
+        spin_lock_irqsave(&wdt->lock, flags);
 
         del_timer(&wdt->timer);
 
@@ -138,28 +139,39 @@ static void sh_wdt_stop(struct sh_wdt *wdt)
         csr &= ~WTCSR_TME;
         sh_wdt_write_csr(csr);
 
-        spin_unlock_irqrestore(&shwdt_lock, flags);
+        spin_unlock_irqrestore(&wdt->lock, flags);
+
+        clk_disable(wdt->clk);
+        pm_runtime_put_sync(wdt->dev);
+
+        return 0;
 }
 
-static inline void sh_wdt_keepalive(struct sh_wdt *wdt)
+static int sh_wdt_keepalive(struct watchdog_device *wdt_dev)
 {
+        struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
         unsigned long flags;
 
-        spin_lock_irqsave(&shwdt_lock, flags);
+        spin_lock_irqsave(&wdt->lock, flags);
         next_heartbeat = jiffies + (heartbeat * HZ);
-        spin_unlock_irqrestore(&shwdt_lock, flags);
+        spin_unlock_irqrestore(&wdt->lock, flags);
+
+        return 0;
 }
 
-static int sh_wdt_set_heartbeat(int t)
+static int sh_wdt_set_heartbeat(struct watchdog_device *wdt_dev, unsigned t)
 {
+        struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
         unsigned long flags;
 
         if (unlikely(t < 1 || t > 3600)) /* arbitrary upper limit */
                 return -EINVAL;
 
-        spin_lock_irqsave(&shwdt_lock, flags);
+        spin_lock_irqsave(&wdt->lock, flags);
         heartbeat = t;
-        spin_unlock_irqrestore(&shwdt_lock, flags);
+        wdt_dev->timeout = t;
+        spin_unlock_irqrestore(&wdt->lock, flags);
+
         return 0;
 }
 
@@ -168,7 +180,7 @@ static void sh_wdt_ping(unsigned long data)
         struct sh_wdt *wdt = (struct sh_wdt *)data;
         unsigned long flags;
 
-        spin_lock_irqsave(&shwdt_lock, flags);
+        spin_lock_irqsave(&wdt->lock, flags);
         if (time_before(jiffies, next_heartbeat)) {
                 u8 csr;
 
@@ -182,137 +194,9 @@ static void sh_wdt_ping(unsigned long data)
         } else
                 dev_warn(wdt->dev, "Heartbeat lost! Will not ping "
                          "the watchdog\n");
-        spin_unlock_irqrestore(&shwdt_lock, flags);
-}
-
-static int sh_wdt_open(struct inode *inode, struct file *file)
-{
-        struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
-
-        if (test_and_set_bit(0, &wdt->enabled))
-                return -EBUSY;
-        if (nowayout)
-                __module_get(THIS_MODULE);
-
-        file->private_data = wdt;
-
-        sh_wdt_start(wdt);
-
-        return nonseekable_open(inode, file);
-}
-
-static int sh_wdt_close(struct inode *inode, struct file *file)
-{
-        struct sh_wdt *wdt = file->private_data;
-
-        if (wdt->expect_close == 42) {
-                sh_wdt_stop(wdt);
-        } else {
-                dev_crit(wdt->dev, "Unexpected close, not "
-                         "stopping watchdog!\n");
-                sh_wdt_keepalive(wdt);
-        }
-
-        clear_bit(0, &wdt->enabled);
-        wdt->expect_close = 0;
-
-        return 0;
-}
-
-static ssize_t sh_wdt_write(struct file *file, const char *buf,
-                            size_t count, loff_t *ppos)
-{
-        struct sh_wdt *wdt = file->private_data;
-
-        if (count) {
-                if (!nowayout) {
-                        size_t i;
-
-                        wdt->expect_close = 0;
-
-                        for (i = 0; i != count; i++) {
-                                char c;
-                                if (get_user(c, buf + i))
-                                        return -EFAULT;
-                                if (c == 'V')
-                                        wdt->expect_close = 42;
-                        }
-                }
-                sh_wdt_keepalive(wdt);
-        }
-
-        return count;
+        spin_unlock_irqrestore(&wdt->lock, flags);
 }
 
-static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
-                                                        unsigned long arg)
-{
-        struct sh_wdt *wdt = file->private_data;
-        int new_heartbeat;
-        int options, retval = -EINVAL;
-
-        switch (cmd) {
-        case WDIOC_GETSUPPORT:
-                return copy_to_user((struct watchdog_info *)arg,
-                          &sh_wdt_info, sizeof(sh_wdt_info)) ? -EFAULT : 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) {
-                        sh_wdt_stop(wdt);
-                        retval = 0;
-                }
-
-                if (options & WDIOS_ENABLECARD) {
-                        sh_wdt_start(wdt);
-                        retval = 0;
-                }
-
-                return retval;
-        case WDIOC_KEEPALIVE:
-                sh_wdt_keepalive(wdt);
-                return 0;
-        case WDIOC_SETTIMEOUT:
-                if (get_user(new_heartbeat, (int *)arg))
-                        return -EFAULT;
-
-                if (sh_wdt_set_heartbeat(new_heartbeat))
-                        return -EINVAL;
-
-                sh_wdt_keepalive(wdt);
-                /* Fall */
-        case WDIOC_GETTIMEOUT:
-                return put_user(heartbeat, (int *)arg);
-        default:
-                return -ENOTTY;
-        }
-        return 0;
-}
-
-static int sh_wdt_notify_sys(struct notifier_block *this,
-                             unsigned long code, void *unused)
-{
-        struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
-
-        if (code == SYS_DOWN || code == SYS_HALT)
-                sh_wdt_stop(wdt);
-
-        return NOTIFY_DONE;
-}
-
-static const struct file_operations sh_wdt_fops = {
-        .owner          = THIS_MODULE,
-        .llseek         = no_llseek,
-        .write          = sh_wdt_write,
-        .unlocked_ioctl = sh_wdt_ioctl,
-        .open           = sh_wdt_open,
-        .release        = sh_wdt_close,
-};
-
 static const struct watchdog_info sh_wdt_info = {
         .options                = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
                                   WDIOF_MAGICCLOSE,
@@ -320,14 +204,17 @@ static const struct watchdog_info sh_wdt_info = {
         .identity               = "SH WDT",
 };
 
-static struct notifier_block sh_wdt_notifier = {
-        .notifier_call          = sh_wdt_notify_sys,
+static const struct watchdog_ops sh_wdt_ops = {
+        .owner          = THIS_MODULE,
+        .start          = sh_wdt_start,
+        .stop           = sh_wdt_stop,
+        .ping           = sh_wdt_keepalive,
+        .set_timeout    = sh_wdt_set_heartbeat,
 };
 
-static struct miscdevice sh_wdt_miscdev = {
-        .minor          = WATCHDOG_MINOR,
-        .name           = "watchdog",
-        .fops           = &sh_wdt_fops,
+static struct watchdog_device sh_wdt_dev = {
+        .info   = &sh_wdt_info,
+        .ops    = &sh_wdt_ops,
 };
 
 static int __devinit sh_wdt_probe(struct platform_device *pdev)
@@ -347,39 +234,49 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev)
         if (unlikely(!res))
                 return -EINVAL;
 
-        if (!devm_request_mem_region(&pdev->dev, res->start,
-                                     resource_size(res), DRV_NAME))
-                return -EBUSY;
-
         wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL);
-        if (unlikely(!wdt)) {
-                rc = -ENOMEM;
-                goto out_release;
-        }
+        if (unlikely(!wdt))
+                return -ENOMEM;
 
         wdt->dev = &pdev->dev;
 
-        wdt->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+        wdt->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(wdt->clk)) {
+                /*
+                 * Clock framework support is optional, continue on
+                 * anyways if we don't find a matching clock.
+                 */
+                wdt->clk = NULL;
+        }
+
+        wdt->base = devm_request_and_ioremap(wdt->dev, res);
         if (unlikely(!wdt->base)) {
-                rc = -ENXIO;
-                goto out_err;
+                rc = -EADDRNOTAVAIL;
+                goto err;
         }
 
-        rc = register_reboot_notifier(&sh_wdt_notifier);
+        watchdog_set_nowayout(&sh_wdt_dev, nowayout);
+        watchdog_set_drvdata(&sh_wdt_dev, wdt);
+
+        spin_lock_init(&wdt->lock);
+
+        rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat);
         if (unlikely(rc)) {
-                dev_err(&pdev->dev,
-                        "Can't register reboot notifier (err=%d)\n", rc);
-                goto out_unmap;
+                /* Default timeout if invalid */
+                sh_wdt_set_heartbeat(&sh_wdt_dev, WATCHDOG_HEARTBEAT);
+
+                dev_warn(&pdev->dev,
+                         "heartbeat value must be 1<=x<=3600, using %d\n",
+                         sh_wdt_dev.timeout);
         }
 
-        sh_wdt_miscdev.parent = wdt->dev;
+        dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n",
+                 sh_wdt_dev.timeout, nowayout);
 
-        rc = misc_register(&sh_wdt_miscdev);
+        rc = watchdog_register_device(&sh_wdt_dev);
         if (unlikely(rc)) {
-                dev_err(&pdev->dev,
-                        "Can't register miscdev on minor=%d (err=%d)\n",
-                                                sh_wdt_miscdev.minor, rc);
-                goto out_unreg;
+                dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc);
+                goto err;
         }
 
         init_timer(&wdt->timer);
@@ -388,20 +285,15 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev)
         wdt->timer.expires      = next_ping_period(clock_division_ratio);
 
         platform_set_drvdata(pdev, wdt);
-        sh_wdt_dev = pdev;
 
         dev_info(&pdev->dev, "initialized.\n");
 
+        pm_runtime_enable(&pdev->dev);
+
         return 0;
 
-out_unreg:
-        unregister_reboot_notifier(&sh_wdt_notifier);
-out_unmap:
-        devm_iounmap(&pdev->dev, wdt->base);
-out_err:
-        devm_kfree(&pdev->dev, wdt);
-out_release:
-        devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
+err:
+        clk_put(wdt->clk);
 
         return rc;
 }
@@ -409,36 +301,35 @@ out_release:
 static int __devexit sh_wdt_remove(struct platform_device *pdev)
 {
         struct sh_wdt *wdt = platform_get_drvdata(pdev);
-        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
         platform_set_drvdata(pdev, NULL);
 
-        misc_deregister(&sh_wdt_miscdev);
+        watchdog_unregister_device(&sh_wdt_dev);
 
-        sh_wdt_dev = NULL;
-
-        unregister_reboot_notifier(&sh_wdt_notifier);
-        devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
-        devm_iounmap(&pdev->dev, wdt->base);
-        devm_kfree(&pdev->dev, wdt);
+        pm_runtime_disable(&pdev->dev);
+        clk_put(wdt->clk);
 
         return 0;
 }
 
+static void sh_wdt_shutdown(struct platform_device *pdev)
+{
+        sh_wdt_stop(&sh_wdt_dev);
+}
+
 static struct platform_driver sh_wdt_driver = {
         .driver         = {
                 .name   = DRV_NAME,
                 .owner  = THIS_MODULE,
         },
 
-        .probe  = sh_wdt_probe,
-        .remove = __devexit_p(sh_wdt_remove),
+        .probe          = sh_wdt_probe,
+        .remove         = __devexit_p(sh_wdt_remove),
+        .shutdown       = sh_wdt_shutdown,
 };
 
 static int __init sh_wdt_init(void)
 {
-        int rc;
-
         if (unlikely(clock_division_ratio < 0x5 ||
                      clock_division_ratio > 0x7)) {
                 clock_division_ratio = WTCSR_CKS_4096;
@@ -447,17 +338,6 @@ static int __init sh_wdt_init(void)
                         clock_division_ratio);
         }
 
-        rc = sh_wdt_set_heartbeat(heartbeat);
-        if (unlikely(rc)) {
-                heartbeat = WATCHDOG_HEARTBEAT;
-
-                pr_info("heartbeat value must be 1<=x<=3600, using %d\n",
-                        heartbeat);
-        }
-
-        pr_info("configured with heartbeat=%d sec (nowayout=%d)\n",
-                heartbeat, nowayout);
-
         return platform_driver_register(&sh_wdt_driver);
 }