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watchdog: w83627hf: Use helper functions to access superio registers 

Use helper functions named similar to other drivers to access
superio registers.

Request memory region only when needed, and use request_muxed_region().
This lets other devices (hwmon, gpio) use the same region.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2013-08-17 13:58:42 -07:00 committed by Wim Van Sebroeck
parent ac461103c5
commit ef0c1a6b1b
1 changed files with 76 additions and 56 deletions
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132
drivers/watchdog/w83627hf_wdt.c
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@ -70,80 +70,102 @@ MODULE_PARM_DESC(nowayout,
(same as EFER) */
#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
static void w83627hf_select_wd_register(void)
#define W83627HF_LD_WDT 0x08
static void superio_outb(int reg, int val)
{
outb_p(0x87, WDT_EFER); /* Enter extended function mode */
outb_p(0x87, WDT_EFER); /* Again according to manual */
outb_p(0x07, WDT_EFER); /* point to logical device number reg */
outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
outb(reg, WDT_EFER);
outb(val, WDT_EFDR);
}
static void w83627hf_unselect_wd_register(void)
static inline int superio_inb(int reg)
{
outb(reg, WDT_EFER);
return inb(WDT_EFDR);
}
static int superio_enter(void)
{
if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
return -EBUSY;
outb_p(0x87, WDT_EFER); /* Enter extended function mode */
outb_p(0x87, WDT_EFER); /* Again according to manual */
return 0;
}
static void superio_select(int ld)
{
superio_outb(0x07, ld);
}
static void superio_exit(void)
{
outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
release_region(wdt_io, 2);
}
/* tyan motherboards seem to set F5 to 0x4C ?
* So explicitly init to appropriate value. */
static void w83627hf_init(struct watchdog_device *wdog)
static int w83627hf_init(struct watchdog_device *wdog)
{
int ret;
unsigned char t;
w83627hf_select_wd_register();
ret = superio_enter();
if (ret)
return ret;
outb(0x20, WDT_EFER); /* check chip version */
t = inb(WDT_EFDR);
superio_select(W83627HF_LD_WDT);
t = superio_inb(0x20); /* check chip version */
if (t == 0x82) { /* W83627THF */
outb_p(0x2b, WDT_EFER); /* select GPIO3 */
t = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */
outb_p(0x2b, WDT_EFER);
outb_p(t, WDT_EFDR); /* set GPIO3 to WDT0 */
t = (superio_inb(0x2b) & 0xf7);
superio_outb(0x2b, t | 0x04); /* set GPIO3 to WDT0 */
} else if (t == 0x88 || t == 0xa0) { /* W83627EHF / W83627DHG */
outb_p(0x2d, WDT_EFER); /* select GPIO5 */
t = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */
outb_p(0x2d, WDT_EFER);
outb_p(t, WDT_EFDR); /* set GPIO5 to WDT0 */
t = superio_inb(0x2d);
superio_outb(0x2d, t & ~0x01); /* set GPIO5 to WDT0 */
}
outb_p(0x30, WDT_EFER); /* select CR30 */
t = inb(WDT_EFDR);
/* set CR30 bit 0 to activate GPIO2 */
t = superio_inb(0x30);
if (!(t & 0x01))
outb_p(t | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
superio_outb(0x30, t | 0x01);
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
t = inb_p(WDT_EFDR); /* read CRF6 */
t = superio_inb(0xF6);
if (t != 0) {
pr_info("Watchdog already running. Resetting timeout to %d sec\n",
wdog->timeout);
outb_p(wdog->timeout, WDT_EFDR); /* Write back to CRF6 */
superio_outb(0xF6, wdog->timeout);
}
outb_p(0xF5, WDT_EFER); /* Select CRF5 */
t = inb_p(WDT_EFDR); /* read CRF5 */
t &= ~0x0C; /* set second mode & disable keyboard
turning off watchdog */
t |= 0x02; /* enable the WDTO# output low pulse
to the KBRST# pin (PIN60) */
outb_p(t, WDT_EFDR); /* Write back to CRF5 */
/* set second mode & disable keyboard turning off watchdog */
t = superio_inb(0xF5) & ~0x0C;
/* enable the WDTO# output low pulse to the KBRST# pin */
t |= 0x02;
superio_outb(0xF5, t);
outb_p(0xF7, WDT_EFER); /* Select CRF7 */
t = inb_p(WDT_EFDR); /* read CRF7 */
t &= ~0xC0; /* disable keyboard & mouse turning off
watchdog */
outb_p(t, WDT_EFDR); /* Write back to CRF7 */
/* disable keyboard & mouse turning off watchdog */
t = superio_inb(0xF7) & ~0xC0;
superio_outb(0xF7, t);
w83627hf_unselect_wd_register();
superio_exit();
return 0;
}
static int wdt_set_time(unsigned int timeout)
{
w83627hf_select_wd_register();
int ret;
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
ret = superio_enter();
if (ret)
return ret;
w83627hf_unselect_wd_register();
superio_select(W83627HF_LD_WDT);
superio_outb(0xF6, timeout);
superio_exit();
return 0;
}
@ -168,13 +190,15 @@ static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
static unsigned int wdt_get_time(struct watchdog_device *wdog)
{
unsigned int timeleft;
int ret;
w83627hf_select_wd_register();
ret = superio_enter();
if (ret)
return 0;
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
timeleft = inb_p(WDT_EFDR); /* Read Timeout counter to CRF6 */
w83627hf_unselect_wd_register();
superio_select(W83627HF_LD_WDT);
timeleft = superio_inb(0xF6);
superio_exit();
return timeleft;
}
@ -231,20 +255,19 @@ static int __init wdt_init(void)
pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n");
if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
pr_err("I/O address 0x%04x already in use\n", wdt_io);
return -EIO;
}
watchdog_init_timeout(&wdt_dev, timeout, NULL);
watchdog_set_nowayout(&wdt_dev, nowayout);
w83627hf_init(&wdt_dev);
ret = w83627hf_init(&wdt_dev);
if (ret) {
pr_err("failed to initialize watchdog (err=%d)\n", ret);
return ret;
}
ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {
pr_err("cannot register reboot notifier (err=%d)\n", ret);
goto unreg_regions;
return ret;
}
ret = watchdog_register_device(&wdt_dev);
@ -258,8 +281,6 @@ static int __init wdt_init(void)
unreg_reboot:
unregister_reboot_notifier(&wdt_notifier);
unreg_regions:
release_region(wdt_io, 1);
return ret;
}
@ -267,7 +288,6 @@ static void __exit wdt_exit(void)
{
watchdog_unregister_device(&wdt_dev);
unregister_reboot_notifier(&wdt_notifier);
release_region(wdt_io, 1);
}
module_init(wdt_init);