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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-08-08 17:33:47 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-08-08 19:18:18 +0100 |
commit | 097d9eb537ff4d88b74c3fe67392e27c478ca3c5 (patch) | |
tree | 9034d676d9096857a380aab9d99e3e88fccb6bfe /drivers/watchdog/ixp2000_wdt.c | |
parent | c41107c2d4fd31924533f4dbc4c3428acc2b5894 (diff) | |
parent | aeee90dfa01844168cd7f8051d0a0f969c573067 (diff) | |
download | linux-097d9eb537ff4d88b74c3fe67392e27c478ca3c5.tar.gz |
Merge Linus' latest into master
Conflicts:
drivers/watchdog/at91rm9200_wdt.c
drivers/watchdog/davinci_wdt.c
drivers/watchdog/ep93xx_wdt.c
drivers/watchdog/ixp2000_wdt.c
drivers/watchdog/ixp4xx_wdt.c
drivers/watchdog/ks8695_wdt.c
drivers/watchdog/omap_wdt.c
drivers/watchdog/pnx4008_wdt.c
drivers/watchdog/sa1100_wdt.c
drivers/watchdog/wdt285.c
Diffstat (limited to 'drivers/watchdog/ixp2000_wdt.c')
-rw-r--r-- | drivers/watchdog/ixp2000_wdt.c | 61 |
1 files changed, 28 insertions, 33 deletions
diff --git a/drivers/watchdog/ixp2000_wdt.c b/drivers/watchdog/ixp2000_wdt.c index 4226dae7d260..4f4b35a20d84 100644 --- a/drivers/watchdog/ixp2000_wdt.c +++ b/drivers/watchdog/ixp2000_wdt.c @@ -25,42 +25,44 @@ #include <linux/watchdog.h> #include <linux/init.h> #include <linux/bitops.h> - +#include <linux/uaccess.h> #include <mach/hardware.h> -#include <asm/uaccess.h> static int nowayout = WATCHDOG_NOWAYOUT; static unsigned int heartbeat = 60; /* (secs) Default is 1 minute */ static unsigned long wdt_status; +static spinlock_t wdt_lock; #define WDT_IN_USE 0 #define WDT_OK_TO_CLOSE 1 static unsigned long wdt_tick_rate; -static void -wdt_enable(void) +static void wdt_enable(void) { + spin_lock(&wdt_lock); ixp2000_reg_write(IXP2000_RESET0, *(IXP2000_RESET0) | WDT_RESET_ENABLE); ixp2000_reg_write(IXP2000_TWDE, WDT_ENABLE); ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate); ixp2000_reg_write(IXP2000_T4_CTL, TIMER_DIVIDER_256 | TIMER_ENABLE); + spin_unlock(&wdt_lock); } -static void -wdt_disable(void) +static void wdt_disable(void) { + spin_lock(&wdt_lock); ixp2000_reg_write(IXP2000_T4_CTL, 0); + spin_unlock(&wdt_lock); } -static void -wdt_keepalive(void) +static void wdt_keepalive(void) { + spin_lock(&wdt_lock); ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate); + spin_unlock(&wdt_lock); } -static int -ixp2000_wdt_open(struct inode *inode, struct file *file) +static int ixp2000_wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(WDT_IN_USE, &wdt_status)) return -EBUSY; @@ -72,8 +74,8 @@ ixp2000_wdt_open(struct inode *inode, struct file *file) return nonseekable_open(inode, file); } -static ssize_t -ixp2000_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) +static ssize_t ixp2000_wdt_write(struct file *file, const char *data, + size_t len, loff_t *ppos) { if (len) { if (!nowayout) { @@ -103,9 +105,8 @@ static struct watchdog_info ident = { .identity = "IXP2000 Watchdog", }; -static int -ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) +static long ixp2000_wdt_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) { int ret = -ENOTTY; int time; @@ -124,6 +125,11 @@ ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, ret = put_user(0, (int *)arg); break; + case WDIOC_KEEPALIVE: + wdt_enable(); + ret = 0; + break; + case WDIOC_SETTIMEOUT: ret = get_user(time, (int *)arg); if (ret) @@ -141,26 +147,18 @@ ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, case WDIOC_GETTIMEOUT: ret = put_user(heartbeat, (int *)arg); break; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; } return ret; } -static int -ixp2000_wdt_release(struct inode *inode, struct file *file) +static int ixp2000_wdt_release(struct inode *inode, struct file *file) { - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) { + if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) wdt_disable(); - } else { + else printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - " "timer will not stop\n"); - } - clear_bit(WDT_IN_USE, &wdt_status); clear_bit(WDT_OK_TO_CLOSE, &wdt_status); @@ -168,18 +166,16 @@ ixp2000_wdt_release(struct inode *inode, struct file *file) } -static const struct file_operations ixp2000_wdt_fops = -{ +static const struct file_operations ixp2000_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = ixp2000_wdt_write, - .ioctl = ixp2000_wdt_ioctl, + .unlocked_ioctl = ixp2000_wdt_ioctl, .open = ixp2000_wdt_open, .release = ixp2000_wdt_release, }; -static struct miscdevice ixp2000_wdt_miscdev = -{ +static struct miscdevice ixp2000_wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &ixp2000_wdt_fops, @@ -191,9 +187,8 @@ static int __init ixp2000_wdt_init(void) printk(KERN_INFO "Unable to use IXP2000 watchdog due to IXP2800 erratum #25.\n"); return -EIO; } - wdt_tick_rate = (*IXP2000_T1_CLD * HZ) / 256; - + spin_lock_init(&wdt_lock); return misc_register(&ixp2000_wdt_miscdev); } |