From: Woody Suwalski Date: Sun, 8 Jan 2006 09:00:31 +0000 (-0800) Subject: [PATCH] ARM Netwinder watchdog wdt977 update X-Git-Tag: v2.6.16-rc1~907 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dab06fa7b6d07ee95c8bba5ddd0840633069159;p=linux-2.6 [PATCH] ARM Netwinder watchdog wdt977 update Cleanup for the ARM-only watchdog driver wdt977. This is probably the last update, since we want to merge with w83977f_wdt. Jose Goncalves has ported this driver to i386, so probably we can iron out configuration differences. Signed-off-by: Woody Suwalski Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/watchdog/wdt977.c b/drivers/char/watchdog/wdt977.c index 44d49dfacb..3843900e94 100644 --- a/drivers/char/watchdog/wdt977.c +++ b/drivers/char/watchdog/wdt977.c @@ -1,5 +1,5 @@ /* - * Wdt977 0.03: A Watchdog Device for Netwinder W83977AF chip + * Wdt977 0.04: A Watchdog Device for Netwinder W83977AF chip * * (c) Copyright 1998 Rebel.com (Woody Suwalski ) * @@ -18,6 +18,8 @@ * from minutes to seconds. * 07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in * nwwatchdog_init. + * 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks + * remove limitiation to be used on Netwinders only */ #include @@ -28,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -37,8 +40,18 @@ #include #include -#define PFX "Wdt977: " -#define WATCHDOG_MINOR 130 +#define WATCHDOG_VERSION "0.04" +#define WATCHDOG_NAME "Wdt977" +#define PFX WATCHDOG_NAME ": " +#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" + +#define IO_INDEX_PORT 0x370 /* on some systems it can be 0x3F0 */ +#define IO_DATA_PORT (IO_INDEX_PORT+1) + +#define UNLOCK_DATA 0x87 +#define LOCK_DATA 0xAA +#define DEVICE_REGISTER 0x07 + #define DEFAULT_TIMEOUT 60 /* default timeout in seconds */ @@ -47,6 +60,7 @@ static int timeoutM; /* timeout in minutes */ static unsigned long timer_alive; static int testmode; static char expect_close; +static spinlock_t spinlock; module_param(timeout, int, 0); MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")"); @@ -63,9 +77,13 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON static int wdt977_start(void) { + unsigned long flags; + + spin_lock_irqsave(&spinlock, flags); + /* unlock the SuperIO chip */ - outb(0x87,0x370); - outb(0x87,0x370); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); /* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4 * F2 has the timeout in minutes @@ -73,28 +91,29 @@ static int wdt977_start(void) * at timeout, and to reset timer on kbd/mouse activity (not impl.) * F4 is used to just clear the TIMEOUT'ed state (bit 0) */ - outb(0x07,0x370); - outb(0x08,0x371); - outb(0xF2,0x370); - outb(timeoutM,0x371); - outb(0xF3,0x370); - outb(0x00,0x371); /* another setting is 0E for kbd/mouse/LED */ - outb(0xF4,0x370); - outb(0x00,0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); + outb_p(0xF2, IO_INDEX_PORT); + outb_p(timeoutM, IO_DATA_PORT); + outb_p(0xF3, IO_INDEX_PORT); + outb_p(0x00, IO_DATA_PORT); /* another setting is 0E for kbd/mouse/LED */ + outb_p(0xF4, IO_INDEX_PORT); + outb_p(0x00, IO_DATA_PORT); /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ /* in test mode watch the bit 1 on F4 to indicate "triggered" */ if (!testmode) { - outb(0x07,0x370); - outb(0x07,0x371); - outb(0xE6,0x370); - outb(0x08,0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x07, IO_DATA_PORT); + outb_p(0xE6, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); } /* lock the SuperIO chip */ - outb(0xAA,0x370); + outb_p(LOCK_DATA, IO_INDEX_PORT); + spin_unlock_irqrestore(&spinlock, flags); printk(KERN_INFO PFX "activated.\n"); return 0; @@ -106,35 +125,39 @@ static int wdt977_start(void) static int wdt977_stop(void) { + unsigned long flags; + spin_lock_irqsave(&spinlock, flags); + /* unlock the SuperIO chip */ - outb(0x87,0x370); - outb(0x87,0x370); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); /* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4 * F3 is reset to its default state * F4 can clear the TIMEOUT'ed state (bit 0) - back to default * We can not use GP17 as a PowerLed, as we use its usage as a RedLed */ - outb(0x07,0x370); - outb(0x08,0x371); - outb(0xF2,0x370); - outb(0xFF,0x371); - outb(0xF3,0x370); - outb(0x00,0x371); - outb(0xF4,0x370); - outb(0x00,0x371); - outb(0xF2,0x370); - outb(0x00,0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); + outb_p(0xF2, IO_INDEX_PORT); + outb_p(0xFF, IO_DATA_PORT); + outb_p(0xF3, IO_INDEX_PORT); + outb_p(0x00, IO_DATA_PORT); + outb_p(0xF4, IO_INDEX_PORT); + outb_p(0x00, IO_DATA_PORT); + outb_p(0xF2, IO_INDEX_PORT); + outb_p(0x00, IO_DATA_PORT); /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ - outb(0x07,0x370); - outb(0x07,0x371); - outb(0xE6,0x370); - outb(0x08,0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x07, IO_DATA_PORT); + outb_p(0xE6, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); /* lock the SuperIO chip */ - outb(0xAA,0x370); + outb_p(LOCK_DATA, IO_INDEX_PORT); + spin_unlock_irqrestore(&spinlock, flags); printk(KERN_INFO PFX "shutdown.\n"); return 0; @@ -147,19 +170,23 @@ static int wdt977_stop(void) static int wdt977_keepalive(void) { + unsigned long flags; + spin_lock_irqsave(&spinlock, flags); + /* unlock the SuperIO chip */ - outb(0x87,0x370); - outb(0x87,0x370); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); /* select device Aux2 (device=8) and kicks watchdog reg F2 */ /* F2 has the timeout in minutes */ - outb(0x07,0x370); - outb(0x08,0x371); - outb(0xF2,0x370); - outb(timeoutM,0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); + outb_p(0xF2, IO_INDEX_PORT); + outb_p(timeoutM, IO_DATA_PORT); /* lock the SuperIO chip */ - outb(0xAA,0x370); + outb_p(LOCK_DATA, IO_INDEX_PORT); + spin_unlock_irqrestore(&spinlock, flags); return 0; } @@ -198,22 +225,26 @@ static int wdt977_set_timeout(int t) static int wdt977_get_status(int *status) { int new_status; + unsigned long flags; - *status=0; + spin_lock_irqsave(&spinlock, flags); /* unlock the SuperIO chip */ - outb(0x87,0x370); - outb(0x87,0x370); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); + outb_p(UNLOCK_DATA, IO_INDEX_PORT); /* select device Aux2 (device=8) and read watchdog reg F4 */ - outb(0x07,0x370); - outb(0x08,0x371); - outb(0xF4,0x370); - new_status = inb(0x371); + outb_p(DEVICE_REGISTER, IO_INDEX_PORT); + outb_p(0x08, IO_DATA_PORT); + outb_p(0xF4, IO_INDEX_PORT); + new_status = inb_p(IO_DATA_PORT); /* lock the SuperIO chip */ - outb(0xAA,0x370); + outb_p(LOCK_DATA, IO_INDEX_PORT); + spin_unlock_irqrestore(&spinlock, flags); + + *status=0; if (new_status & 1) *status |= WDIOF_CARDRESET; @@ -249,8 +280,8 @@ static int wdt977_release(struct inode *inode, struct file *file) wdt977_stop(); clear_bit(0,&timer_alive); } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); wdt977_keepalive(); + printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); } expect_close = 0; return 0; @@ -271,14 +302,17 @@ static int wdt977_release(struct inode *inode, struct file *file) static ssize_t wdt977_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - if (count) { - if (!nowayout) { + if (count) + { + if (!nowayout) + { size_t i; /* In case it was set long ago */ expect_close = 0; - for (i = 0; i != count; i++) { + for (i = 0; i != count; i++) + { char c; if (get_user(c, buf + i)) return -EFAULT; @@ -287,6 +321,7 @@ static ssize_t wdt977_write(struct file *file, const char __user *buf, } } + /* someone wrote to us, we should restart timer */ wdt977_keepalive(); } return count; @@ -308,7 +343,7 @@ static struct watchdog_info ident = { WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .firmware_version = 1, - .identity = "Winbond 83977", + .identity = WATCHDOG_NAME, }; static int wdt977_ioctl(struct inode *inode, struct file *file, @@ -405,50 +440,81 @@ static struct notifier_block wdt977_notifier = { .notifier_call = wdt977_notify_sys, }; -static int __init nwwatchdog_init(void) +static int __init wd977_init(void) { - int retval; - if (!machine_is_netwinder()) - return -ENODEV; + int rc; + + //if (!machine_is_netwinder()) + // return -ENODEV; + + printk(KERN_INFO PFX DRIVER_VERSION); + + spin_lock_init(&spinlock); /* Check that the timeout value is within it's range ; if not reset to the default */ - if (wdt977_set_timeout(timeout)) { + if (wdt977_set_timeout(timeout)) + { wdt977_set_timeout(DEFAULT_TIMEOUT); printk(KERN_INFO PFX "timeout value must be 60"); +MODULE_AUTHOR("Woody Suwalski "); MODULE_DESCRIPTION("W83977AF Watchdog driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);