diff options
| -rw-r--r-- | drivers/char/watchdog/mv64x60_wdt.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/drivers/char/watchdog/mv64x60_wdt.c b/drivers/char/watchdog/mv64x60_wdt.c index 420c7b82f4ca..e990e3af8be4 100644 --- a/drivers/char/watchdog/mv64x60_wdt.c +++ b/drivers/char/watchdog/mv64x60_wdt.c @@ -43,6 +43,7 @@ static unsigned long wdt_flags; static int wdt_status; static void __iomem *mv64x60_wdt_regs; static int mv64x60_wdt_timeout; +static unsigned int bus_clk; static void mv64x60_wdt_reg_write(u32 val) { @@ -82,6 +83,18 @@ static void mv64x60_wdt_handler_enable(void) } } +static void mv64x60_wdt_set_timeout(int timeout) +{ + /* maximum bus cycle count is 0xFFFFFFFF */ + if (timeout > 0xFFFFFFFF / bus_clk) + timeout = 0xFFFFFFFF / bus_clk; + + mv64x60_wdt_timeout = timeout; + writel((timeout * bus_clk) >> 8, + mv64x60_wdt_regs + MV64x60_WDT_WDC_OFFSET); + mv64x60_wdt_service(); +} + static int mv64x60_wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags)) @@ -118,9 +131,11 @@ static ssize_t mv64x60_wdt_write(struct file *file, const char __user *data, static int mv64x60_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { + int timeout; void __user *argp = (void __user *)arg; static struct watchdog_info info = { - .options = WDIOF_KEEPALIVEPING, + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING, .firmware_version = 0, .identity = "MV64x60 watchdog", }; @@ -150,7 +165,10 @@ static int mv64x60_wdt_ioctl(struct inode *inode, struct file *file, break; case WDIOC_SETTIMEOUT: - return -EOPNOTSUPP; + if (get_user(timeout, (int __user *)argp)) + return -EFAULT; + mv64x60_wdt_set_timeout(timeout); + /* Fall through */ case WDIOC_GETTIMEOUT: if (put_user(mv64x60_wdt_timeout, (int __user *)argp)) @@ -182,15 +200,22 @@ static struct miscdevice mv64x60_wdt_miscdev = { static int __devinit mv64x60_wdt_probe(struct platform_device *dev) { struct mv64x60_wdt_pdata *pdata = dev->dev.platform_data; - int bus_clk = 133; struct resource *r; + int timeout = 10; - mv64x60_wdt_timeout = 10; + bus_clk = 133; /* in MHz */ if (pdata) { - mv64x60_wdt_timeout = pdata->timeout; + timeout = pdata->timeout; bus_clk = pdata->bus_clk; } + /* Since bus_clk is truncated MHz, actual frequency could be + * up to 1MHz higher. Round up, since it's better to time out + * too late than too soon. + */ + bus_clk++; + bus_clk *= 1000000; /* convert to Hz */ + r = platform_get_resource(dev, IORESOURCE_MEM, 0); if (!r) return -ENODEV; @@ -199,8 +224,7 @@ static int __devinit mv64x60_wdt_probe(struct platform_device *dev) if (mv64x60_wdt_regs == NULL) return -ENOMEM; - writel((mv64x60_wdt_timeout * (bus_clk * 1000000)) >> 8, - mv64x60_wdt_regs + MV64x60_WDT_WDC_OFFSET); + mv64x60_wdt_set_timeout(timeout); return misc_register(&mv64x60_wdt_miscdev); } |