watchdog: shwdt: driver model conversion.
This is a long overdue driver model conversion for the shwdt watchdog driver. This is the initial conversion, more incremental changes to follow. Signed-off-by: Paul Mundt <lethal@linux-sh.org>hifive-unleashed-5.1
Paul Mundt
parent
b1fa888e01
commit
8f5585ec3d
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@ -19,6 +19,7 @@
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*/
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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/init.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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@ -28,11 +29,12 @@
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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 PFX "shwdt: "
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#define DRV_NAME "sh-wdt"
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/*
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* Default clock division ratio is 5.25 msecs. For an additional table of
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@ -62,31 +64,36 @@
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* misses its deadline, the kernel timer will allow the WDT to overflow.
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*/
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static int clock_division_ratio = WTCSR_CKS_4096;
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#define next_ping_period(cks) msecs_to_jiffies(cks - 4)
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static void sh_wdt_ping(unsigned long data);
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static unsigned long shwdt_is_open;
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static const struct watchdog_info sh_wdt_info;
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static char shwdt_expect_close;
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static DEFINE_TIMER(timer, sh_wdt_ping, 0, 0);
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static unsigned long next_heartbeat;
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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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static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
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static int nowayout = WATCHDOG_NOWAYOUT;
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static unsigned long next_heartbeat;
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static void sh_wdt_start(void)
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struct sh_wdt {
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void __iomem *base;
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struct device *dev;
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struct timer_list timer;
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unsigned long enabled;
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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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{
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__u8 csr;
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unsigned long flags;
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u8 csr;
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spin_lock_irqsave(&shwdt_lock, flags);
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next_heartbeat = jiffies + (heartbeat * HZ);
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mod_timer(&timer, next_ping_period(clock_division_ratio));
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mod_timer(&wdt->timer, next_ping_period(clock_division_ratio));
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csr = sh_wdt_read_csr();
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csr |= WTCSR_WT | clock_division_ratio;
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@ -115,22 +122,23 @@ static void sh_wdt_start(void)
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spin_unlock_irqrestore(&shwdt_lock, flags);
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}
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static void sh_wdt_stop(void)
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static void sh_wdt_stop(struct sh_wdt *wdt)
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{
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__u8 csr;
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unsigned long flags;
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u8 csr;
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spin_lock_irqsave(&shwdt_lock, flags);
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del_timer(&timer);
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del_timer(&wdt->timer);
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csr = sh_wdt_read_csr();
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csr &= ~WTCSR_TME;
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sh_wdt_write_csr(csr);
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spin_unlock_irqrestore(&shwdt_lock, flags);
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}
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static inline void sh_wdt_keepalive(void)
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static inline void sh_wdt_keepalive(struct sh_wdt *wdt)
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{
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unsigned long flags;
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@ -154,11 +162,12 @@ static int sh_wdt_set_heartbeat(int t)
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static void sh_wdt_ping(unsigned long data)
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{
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struct sh_wdt *wdt = (struct sh_wdt *)data;
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unsigned long flags;
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spin_lock_irqsave(&shwdt_lock, flags);
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if (time_before(jiffies, next_heartbeat)) {
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__u8 csr;
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u8 csr;
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csr = sh_wdt_read_csr();
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csr &= ~WTCSR_IOVF;
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@ -166,37 +175,43 @@ static void sh_wdt_ping(unsigned long data)
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sh_wdt_write_cnt(0);
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mod_timer(&timer, next_ping_period(clock_division_ratio));
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mod_timer(&wdt->timer, next_ping_period(clock_division_ratio));
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} else
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printk(KERN_WARNING PFX "Heartbeat lost! Will not ping "
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"the watchdog\n");
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dev_warn(wdt->dev, "Heartbeat lost! Will not ping "
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"the watchdog\n");
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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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if (test_and_set_bit(0, &shwdt_is_open))
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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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sh_wdt_start();
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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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if (shwdt_expect_close == 42) {
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sh_wdt_stop();
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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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printk(KERN_CRIT PFX "Unexpected close, not "
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"stopping watchdog!\n");
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sh_wdt_keepalive();
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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, &shwdt_is_open);
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shwdt_expect_close = 0;
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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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@ -204,21 +219,23 @@ static int sh_wdt_close(struct inode *inode, struct file *file)
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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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shwdt_expect_close = 0;
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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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shwdt_expect_close = 42;
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wdt->expect_close = 42;
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}
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}
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sh_wdt_keepalive();
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sh_wdt_keepalive(wdt);
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}
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return count;
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@ -227,6 +244,7 @@ static ssize_t sh_wdt_write(struct file *file, const char *buf,
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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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@ -242,18 +260,18 @@ static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
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return -EFAULT;
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if (options & WDIOS_DISABLECARD) {
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sh_wdt_stop();
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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();
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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();
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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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@ -262,7 +280,7 @@ static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
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if (sh_wdt_set_heartbeat(new_heartbeat))
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return -EINVAL;
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sh_wdt_keepalive();
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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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@ -275,8 +293,10 @@ static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
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static int sh_wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
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if (code == SYS_DOWN || code == SYS_HALT)
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sh_wdt_stop();
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sh_wdt_stop(wdt);
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return NOTIFY_DONE;
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}
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@ -307,56 +327,148 @@ static struct miscdevice sh_wdt_miscdev = {
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.fops = &sh_wdt_fops,
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};
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static int __devinit sh_wdt_probe(struct platform_device *pdev)
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{
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struct sh_wdt *wdt;
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struct resource *res;
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int rc;
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/*
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* As this driver only covers the global watchdog case, reject
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* any attempts to register per-CPU watchdogs.
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*/
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if (pdev->id != -1)
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return -EINVAL;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(!res))
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return -EINVAL;
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if (!devm_request_mem_region(&pdev->dev, res->start,
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resource_size(res), DRV_NAME))
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return -EBUSY;
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wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL);
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if (unlikely(!wdt)) {
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rc = -ENOMEM;
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goto out_release;
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}
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wdt->dev = &pdev->dev;
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wdt->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (unlikely(!wdt->base)) {
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rc = -ENXIO;
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goto out_err;
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}
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rc = register_reboot_notifier(&sh_wdt_notifier);
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if (unlikely(rc)) {
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dev_err(&pdev->dev,
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"Can't register reboot notifier (err=%d)\n", rc);
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goto out_unmap;
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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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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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goto out_unreg;
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}
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init_timer(&wdt->timer);
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wdt->timer.function = sh_wdt_ping;
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wdt->timer.data = (unsigned long)wdt;
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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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return 0;
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out_unreg:
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unregister_reboot_notifier(&sh_wdt_notifier);
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out_unmap:
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devm_iounmap(&pdev->dev, wdt->base);
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out_err:
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devm_kfree(&pdev->dev, wdt);
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out_release:
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devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
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return rc;
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}
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static int __devexit sh_wdt_remove(struct platform_device *pdev)
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{
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struct sh_wdt *wdt = platform_get_drvdata(pdev);
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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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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unregister_reboot_notifier(&sh_wdt_notifier);
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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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devm_kfree(&pdev->dev, wdt);
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return 0;
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}
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static struct platform_driver sh_wdt_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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.probe = sh_wdt_probe,
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.remove = __devexit_p(sh_wdt_remove),
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};
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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 (clock_division_ratio < 0x5 || clock_division_ratio > 0x7) {
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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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printk(KERN_INFO PFX
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"clock_division_ratio value must be 0x5<=x<=0x7, using %d\n",
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clock_division_ratio);
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pr_info("%s: divisor must be 0x5<=x<=0x7, using %d\n",
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DRV_NAME, 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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printk(KERN_INFO PFX
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"heartbeat value must be 1<=x<=3600, using %d\n",
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heartbeat);
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pr_info("%s: heartbeat value must be 1<=x<=3600, using %d\n",
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DRV_NAME, heartbeat);
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}
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rc = register_reboot_notifier(&sh_wdt_notifier);
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if (unlikely(rc)) {
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printk(KERN_ERR PFX
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"Can't register reboot notifier (err=%d)\n", rc);
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return rc;
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}
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pr_info("%s: configured with heartbeat=%d sec (nowayout=%d)\n",
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DRV_NAME, heartbeat, nowayout);
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rc = misc_register(&sh_wdt_miscdev);
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if (unlikely(rc)) {
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printk(KERN_ERR PFX
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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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unregister_reboot_notifier(&sh_wdt_notifier);
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return rc;
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}
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printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
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heartbeat, nowayout);
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return 0;
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return platform_driver_register(&sh_wdt_driver);
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}
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static void __exit sh_wdt_exit(void)
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{
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misc_deregister(&sh_wdt_miscdev);
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unregister_reboot_notifier(&sh_wdt_notifier);
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platform_driver_unregister(&sh_wdt_driver);
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}
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module_init(sh_wdt_init);
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module_exit(sh_wdt_exit);
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MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
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MODULE_DESCRIPTION("SuperH watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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module_param(clock_division_ratio, int, 0);
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@ -373,6 +485,3 @@ module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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module_init(sh_wdt_init);
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module_exit(sh_wdt_exit);
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