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watchdog: it87_wdt: Add support for watchdogs with 8b timers

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This patch adds support for watchdogs with 8b timers, like ones in
IT8702F and older revisions of IT8712F Super IO chip, to it87_wdt
driver. This patch should be used after the patch
'it87_wdt: Add support for IT8720F watchdog'.

Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ondrej Zajicek 2010-09-14 02:54:16 +02:00 committed by Wim Van Sebroeck
parent ee3e96583e
commit dfb0b8eae1
2 changed files with 63 additions and 28 deletions
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10
drivers/watchdog/Kconfig
View file

@ -565,11 +565,11 @@ config IT87_WDT
tristate "IT87 Watchdog Timer"
depends on X86 && EXPERIMENTAL
---help---
This is the driver for the hardware watchdog on the ITE
IT8716, IT8718, IT8720, IT8726, IT8712(Version J,K) Super I/O
chips. This watchdog simply watches your kernel to make sure
it doesn't freeze, and if it does, it reboots your computer
after a certain amount of time.
This is the driver for the hardware watchdog on the ITE IT8702,
IT8712, IT8716, IT8718, IT8720, IT8726, IT8712 Super I/O chips.
This watchdog simply watches your kernel to make sure it doesn't
freeze, and if it does, it reboots your computer after a certain
amount of time.
To compile this driver as a module, choose M here: the module will
be called it87_wdt.

79
drivers/watchdog/it87_wdt.c
View file

@ -12,7 +12,7 @@
* http://www.ite.com.tw/
*
* Support of the watchdog timers, which are available on
* IT8716, IT8718, IT8720, IT8726 and IT8712 (J,K version).
* IT8702, IT8712, IT8716, IT8718, IT8720 and IT8726.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -76,6 +76,7 @@
/* Chip Id numbers */
#define NO_DEV_ID 0xffff
#define IT8702_ID 0x8702
#define IT8705_ID 0x8705
#define IT8712_ID 0x8712
#define IT8716_ID 0x8716
@ -133,7 +134,7 @@
#define WDTS_USE_GP 4
#define WDTS_EXPECTED 5
static unsigned int base, gpact, ciract;
static unsigned int base, gpact, ciract, max_units;
static unsigned long wdt_status;
static DEFINE_SPINLOCK(spinlock);
@ -211,6 +212,33 @@ static inline void superio_outw(int val, int reg)
outb(val, VAL);
}
/* Internal function, should be called after superio_select(GPIO) */
static void wdt_update_timeout(void)
{
unsigned char cfg = WDT_KRST | WDT_PWROK;
int tm = timeout;
if (testmode)
cfg = 0;
if (tm <= max_units)
cfg |= WDT_TOV1;
else
tm /= 60;
superio_outb(cfg, WDTCFG);
superio_outb(tm, WDTVALLSB);
if (max_units > 255)
superio_outb(tm>>8, WDTVALMSB);
}
static int wdt_round_time(int t)
{
t += 59;
t -= t % 60;
return t;
}
/* watchdog timer handling */
static void wdt_keepalive(void)
@ -235,12 +263,7 @@ static void wdt_start(void)
superio_outb(WDT_GAMEPORT, WDTCTRL);
else
superio_outb(WDT_CIRINT, WDTCTRL);
if (!testmode)
superio_outb(WDT_TOV1 | WDT_KRST | WDT_PWROK, WDTCFG);
else
superio_outb(WDT_TOV1, WDTCFG);
superio_outb(timeout>>8, WDTVALMSB);
superio_outb(timeout, WDTVALLSB);
wdt_update_timeout();
superio_exit();
spin_unlock_irqrestore(&spinlock, flags);
@ -256,8 +279,9 @@ static void wdt_stop(void)
superio_select(GPIO);
superio_outb(0x00, WDTCTRL);
superio_outb(WDT_TOV1, WDTCFG);
superio_outb(0x00, WDTVALMSB);
superio_outb(0x00, WDTVALLSB);
if (max_units > 255)
superio_outb(0x00, WDTVALMSB);
superio_exit();
spin_unlock_irqrestore(&spinlock, flags);
@ -267,8 +291,8 @@ static void wdt_stop(void)
* wdt_set_timeout - set a new timeout value with watchdog ioctl
* @t: timeout value in seconds
*
* The hardware device has a 16 bit watchdog timer, thus the
* timeout time ranges between 1 and 65535 seconds.
* The hardware device has a 8 or 16 bit watchdog timer (depends on
* chip version) that can be configured to count seconds or minutes.
*
* Used within WDIOC_SETTIMEOUT watchdog device ioctl.
*/
@ -277,19 +301,19 @@ static int wdt_set_timeout(int t)
{
unsigned long flags;
if (t < 1 || t > 65535)
if (t < 1 || t > max_units * 60)
return -EINVAL;
if (t > max_units)
timeout = wdt_round_time(t);
else
timeout = t;
spin_lock_irqsave(&spinlock, flags);
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
superio_enter();
superio_select(GPIO);
superio_outb(t>>8, WDTVALMSB);
superio_outb(t, WDTVALLSB);
wdt_update_timeout();
superio_exit();
}
spin_unlock_irqrestore(&spinlock, flags);
@ -535,6 +559,8 @@ static int __init it87_wdt_init(void)
u8 chip_rev;
unsigned long flags;
wdt_status = 0;
spin_lock_irqsave(&spinlock, flags);
superio_enter();
chip_type = superio_inw(CHIPID);
@ -543,16 +569,21 @@ static int __init it87_wdt_init(void)
spin_unlock_irqrestore(&spinlock, flags);
switch (chip_type) {
case IT8702_ID:
max_units = 255;
break;
case IT8712_ID:
max_units = (chip_rev < 8) ? 255 : 65535;
break;
case IT8716_ID:
case IT8726_ID:
max_units = 65535;
break;
case IT8718_ID:
case IT8720_ID:
max_units = 65535;
try_gameport = 0;
break;
case IT8712_ID:
if (chip_rev > 7)
break;
case IT8705_ID:
printk(KERN_ERR PFX
"Unsupported Chip found, Chip %04x Revision %02x\n",
@ -628,13 +659,16 @@ static int __init it87_wdt_init(void)
spin_unlock_irqrestore(&spinlock, flags);
}
if (timeout < 1 || timeout > 65535) {
if (timeout < 1 || timeout > max_units * 60) {
timeout = DEFAULT_TIMEOUT;
printk(KERN_WARNING PFX
"Timeout value out of range, use default %d sec\n",
DEFAULT_TIMEOUT);
}
if (timeout > max_units)
timeout = wdt_round_time(timeout);
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
printk(KERN_ERR PFX
@ -661,7 +695,7 @@ static int __init it87_wdt_init(void)
outb(0x09, CIR_IER(base));
}
printk(KERN_INFO PFX "Chip it%04x revision %d initialized. "
printk(KERN_INFO PFX "Chip IT%04x revision %d initialized. "
"timeout=%d sec (nowayout=%d testmode=%d exclusive=%d "
"nogameport=%d)\n", chip_type, chip_rev, timeout,
nowayout, testmode, exclusive, nogameport);
@ -703,8 +737,9 @@ static void __exit it87_wdt_exit(void)
superio_select(GPIO);
superio_outb(0x00, WDTCTRL);
superio_outb(0x00, WDTCFG);
superio_outb(0x00, WDTVALMSB);
superio_outb(0x00, WDTVALLSB);
if (max_units > 255)
superio_outb(0x00, WDTVALMSB);
if (test_bit(WDTS_USE_GP, &wdt_status)) {
superio_select(GAMEPORT);
superio_outb(gpact, ACTREG);