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watchdog: w83627hf: Enable watchdog only once 

It is unnecessary to enable the logical device and WDT0 each time
the watchdog is accessed. Do it only once during initialization.

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 13:58:40 -07:00 committed by Wim Van Sebroeck
parent 30a83695aa
commit 8f52638959
1 changed files with 17 additions and 18 deletions
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35
drivers/watchdog/w83627hf_wdt.c
View File

@ -72,28 +72,10 @@ MODULE_PARM_DESC(nowayout,
static void w83627hf_select_wd_register(void)
{
unsigned char c;
outb_p(0x87, WDT_EFER); /* Enter extended function mode */
outb_p(0x87, WDT_EFER); /* Again according to manual */
outb(0x20, WDT_EFER); /* check chip version */
c = inb(WDT_EFDR);
if (c == 0x82) { /* W83627THF */
outb_p(0x2b, WDT_EFER); /* select GPIO3 */
c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */
outb_p(0x2b, WDT_EFER);
outb_p(c, WDT_EFDR); /* set GPIO3 to WDT0 */
} else if (c == 0x88 || c == 0xa0) { /* W83627EHF / W83627DHG */
outb_p(0x2d, WDT_EFER); /* select GPIO5 */
c = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */
outb_p(0x2d, WDT_EFER);
outb_p(c, WDT_EFDR); /* set GPIO5 to WDT0 */
}
outb_p(0x07, WDT_EFER); /* point to logical device number reg */
outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
outb_p(0x30, WDT_EFER); /* select CR30 */
outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
}
static void w83627hf_unselect_wd_register(void)
@ -110,6 +92,23 @@ static void w83627hf_init(struct watchdog_device *wdog)
w83627hf_select_wd_register();
outb(0x20, WDT_EFER); /* check chip version */
t = inb(WDT_EFDR);
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 */
} 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 */
}
outb_p(0x30, WDT_EFER); /* select CR30 */
outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
t = inb_p(WDT_EFDR); /* read CRF6 */
if (t != 0) {