watchdog: shwdt: Conversion to watchdog core.
Fairly straightforward conversion to utilize watchdog core support. Signed-off-by: Paul Mundt <lethal@linux-sh.org>hifive-unleashed-5.1
Paul Mundt
parent
4096812636
commit
1950f499df
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@ -1138,6 +1138,7 @@ config ZVM_WATCHDOG
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config SH_WDT
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tristate "SuperH Watchdog"
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depends on SUPERH && (CPU_SH3 || CPU_SH4)
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select WATCHDOG_CORE
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help
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This driver adds watchdog support for the integrated watchdog in the
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SuperH processors. If you have one of these processors and wish
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@ -27,12 +27,10 @@
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <asm/watchdog.h>
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#define DRV_NAME "sh-wdt"
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@ -67,8 +65,6 @@
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static int clock_division_ratio = WTCSR_CKS_4096;
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#define next_ping_period(cks) (jiffies + msecs_to_jiffies(cks - 4))
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static const struct watchdog_info sh_wdt_info;
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static struct platform_device *sh_wdt_dev;
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static DEFINE_SPINLOCK(shwdt_lock);
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#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
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@ -86,8 +82,9 @@ struct sh_wdt {
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char expect_close;
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};
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static void sh_wdt_start(struct sh_wdt *wdt)
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static int sh_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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unsigned long flags;
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u8 csr;
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@ -121,10 +118,13 @@ static void sh_wdt_start(struct sh_wdt *wdt)
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sh_wdt_write_rstcsr(csr);
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#endif
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spin_unlock_irqrestore(&shwdt_lock, flags);
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return 0;
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}
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static void sh_wdt_stop(struct sh_wdt *wdt)
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static int sh_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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unsigned long flags;
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u8 csr;
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@ -137,18 +137,22 @@ static void sh_wdt_stop(struct sh_wdt *wdt)
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sh_wdt_write_csr(csr);
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spin_unlock_irqrestore(&shwdt_lock, flags);
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return 0;
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}
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static inline void sh_wdt_keepalive(struct sh_wdt *wdt)
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static int sh_wdt_keepalive(struct watchdog_device *wdt_dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&shwdt_lock, flags);
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next_heartbeat = jiffies + (heartbeat * HZ);
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spin_unlock_irqrestore(&shwdt_lock, flags);
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return 0;
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}
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static int sh_wdt_set_heartbeat(int t)
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static int sh_wdt_set_heartbeat(struct watchdog_device *wdt_dev, unsigned t)
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{
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unsigned long flags;
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@ -157,7 +161,9 @@ static int sh_wdt_set_heartbeat(int t)
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spin_lock_irqsave(&shwdt_lock, flags);
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heartbeat = t;
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wdt_dev->timeout = t;
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spin_unlock_irqrestore(&shwdt_lock, flags);
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return 0;
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}
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@ -183,123 +189,6 @@ static void sh_wdt_ping(unsigned long data)
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spin_unlock_irqrestore(&shwdt_lock, flags);
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}
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static int sh_wdt_open(struct inode *inode, struct file *file)
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{
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struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
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if (test_and_set_bit(0, &wdt->enabled))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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file->private_data = wdt;
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sh_wdt_start(wdt);
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return nonseekable_open(inode, file);
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}
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static int sh_wdt_close(struct inode *inode, struct file *file)
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{
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struct sh_wdt *wdt = file->private_data;
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if (wdt->expect_close == 42) {
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sh_wdt_stop(wdt);
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} else {
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dev_crit(wdt->dev, "Unexpected close, not "
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"stopping watchdog!\n");
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sh_wdt_keepalive(wdt);
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}
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clear_bit(0, &wdt->enabled);
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wdt->expect_close = 0;
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return 0;
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}
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static ssize_t sh_wdt_write(struct file *file, const char *buf,
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size_t count, loff_t *ppos)
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{
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struct sh_wdt *wdt = file->private_data;
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if (count) {
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if (!nowayout) {
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size_t i;
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wdt->expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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wdt->expect_close = 42;
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}
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}
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sh_wdt_keepalive(wdt);
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}
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return count;
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}
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static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct sh_wdt *wdt = file->private_data;
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int new_heartbeat;
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int options, retval = -EINVAL;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user((struct watchdog_info *)arg,
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&sh_wdt_info, sizeof(sh_wdt_info)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, (int *)arg);
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case WDIOC_SETOPTIONS:
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if (get_user(options, (int *)arg))
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return -EFAULT;
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if (options & WDIOS_DISABLECARD) {
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sh_wdt_stop(wdt);
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retval = 0;
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}
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if (options & WDIOS_ENABLECARD) {
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sh_wdt_start(wdt);
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retval = 0;
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}
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return retval;
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case WDIOC_KEEPALIVE:
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sh_wdt_keepalive(wdt);
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_heartbeat, (int *)arg))
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return -EFAULT;
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if (sh_wdt_set_heartbeat(new_heartbeat))
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return -EINVAL;
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sh_wdt_keepalive(wdt);
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, (int *)arg);
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static const struct file_operations sh_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = sh_wdt_write,
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.unlocked_ioctl = sh_wdt_ioctl,
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.open = sh_wdt_open,
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.release = sh_wdt_close,
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};
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static const struct watchdog_info sh_wdt_info = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE,
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@ -307,10 +196,17 @@ static const struct watchdog_info sh_wdt_info = {
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.identity = "SH WDT",
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};
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static struct miscdevice sh_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &sh_wdt_fops,
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static const struct watchdog_ops sh_wdt_ops = {
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.owner = THIS_MODULE,
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.start = sh_wdt_start,
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.stop = sh_wdt_stop,
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.ping = sh_wdt_keepalive,
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.set_timeout = sh_wdt_set_heartbeat,
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};
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static struct watchdog_device sh_wdt_dev = {
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.info = &sh_wdt_info,
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.ops = &sh_wdt_ops,
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};
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static int __devinit sh_wdt_probe(struct platform_device *pdev)
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@ -348,13 +244,25 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev)
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goto out_err;
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}
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sh_wdt_miscdev.parent = wdt->dev;
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rc = misc_register(&sh_wdt_miscdev);
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rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat);
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if (unlikely(rc)) {
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dev_err(&pdev->dev,
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"Can't register miscdev on minor=%d (err=%d)\n",
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sh_wdt_miscdev.minor, rc);
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/* Default timeout if invalid */
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sh_wdt_set_heartbeat(&sh_wdt_dev, WATCHDOG_HEARTBEAT);
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dev_warn(&pdev->dev,
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"heartbeat value must be 1<=x<=3600, using %d\n",
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sh_wdt_dev.timeout);
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}
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dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n",
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sh_wdt_dev.timeout, nowayout);
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watchdog_set_nowayout(&sh_wdt_dev, nowayout);
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watchdog_set_drvdata(&sh_wdt_dev, wdt);
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rc = watchdog_register_device(&sh_wdt_dev);
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if (unlikely(rc)) {
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dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc);
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goto out_unmap;
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}
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@ -364,7 +272,6 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev)
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wdt->timer.expires = next_ping_period(clock_division_ratio);
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platform_set_drvdata(pdev, wdt);
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sh_wdt_dev = pdev;
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dev_info(&pdev->dev, "initialized.\n");
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@ -387,9 +294,7 @@ static int __devexit sh_wdt_remove(struct platform_device *pdev)
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platform_set_drvdata(pdev, NULL);
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misc_deregister(&sh_wdt_miscdev);
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sh_wdt_dev = NULL;
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watchdog_unregister_device(&sh_wdt_dev);
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devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
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devm_iounmap(&pdev->dev, wdt->base);
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@ -400,9 +305,7 @@ static int __devexit sh_wdt_remove(struct platform_device *pdev)
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static void sh_wdt_shutdown(struct platform_device *pdev)
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{
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struct sh_wdt *wdt = platform_get_drvdata(pdev);
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sh_wdt_stop(wdt);
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sh_wdt_stop(&sh_wdt_dev);
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}
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static struct platform_driver sh_wdt_driver = {
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@ -418,8 +321,6 @@ static struct platform_driver sh_wdt_driver = {
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static int __init sh_wdt_init(void)
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{
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int rc;
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if (unlikely(clock_division_ratio < 0x5 ||
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clock_division_ratio > 0x7)) {
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clock_division_ratio = WTCSR_CKS_4096;
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@ -428,17 +329,6 @@ static int __init sh_wdt_init(void)
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clock_division_ratio);
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}
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rc = sh_wdt_set_heartbeat(heartbeat);
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if (unlikely(rc)) {
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heartbeat = WATCHDOG_HEARTBEAT;
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pr_info("heartbeat value must be 1<=x<=3600, using %d\n",
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heartbeat);
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}
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pr_info("configured with heartbeat=%d sec (nowayout=%d)\n",
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heartbeat, nowayout);
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return platform_driver_register(&sh_wdt_driver);
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}
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