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watchdog: w83627hf_wdt: Add quirk for Inves system 

On some systems, the NCT6791D comes with a companion chip and the
watchdog function is in this companion chip. We must use a different
unlocking sequence to access the companion chip.

Use DMI strings to identify such system and adjust the unlocking
sequence automatically.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Jean Delvare 2018-11-19 09:17:38 +01:00 committed by Wim Van Sebroeck
parent 06f8f2ca05
commit 31eb42bd93
1 changed files with 35 additions and 3 deletions
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38
drivers/watchdog/w83627hf_wdt.c
View File

@ -38,6 +38,7 @@
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/dmi.h>
#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
@ -46,6 +47,8 @@ static int wdt_io;
static int cr_wdt_timeout; /* WDT timeout register */
static int cr_wdt_control; /* WDT control register */
static int cr_wdt_csr; /* WDT control & status register */
static int wdt_cfg_enter = 0x87;/* key to unlock configuration space */
static int wdt_cfg_leave = 0xAA;/* key to lock configuration space */
enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,
w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,
@ -130,8 +133,8 @@ 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 */
outb_p(wdt_cfg_enter, WDT_EFER); /* Enter extended function mode */
outb_p(wdt_cfg_enter, WDT_EFER); /* Again according to manual */
return 0;
}
@ -143,7 +146,7 @@ static void superio_select(int ld)
static void superio_exit(void)
{
outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
outb_p(wdt_cfg_leave, WDT_EFER); /* Leave extended function mode */
release_region(wdt_io, 2);
}
@ -430,6 +433,32 @@ static int wdt_find(int addr)
return ret;
}
/*
* On some systems, the NCT6791D comes with a companion chip and the
* watchdog function is in this companion chip. We must use a different
* unlocking sequence to access the companion chip.
*/
static int __init wdt_use_alt_key(const struct dmi_system_id *d)
{
wdt_cfg_enter = 0x88;
wdt_cfg_leave = 0xBB;
return 0;
}
static const struct dmi_system_id wdt_dmi_table[] __initconst = {
{
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "INVES"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CTS"),
DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "INVES"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "SHARKBAY"),
},
.callback = wdt_use_alt_key,
},
{}
};
static int __init wdt_init(void)
{
int ret;
@ -459,6 +488,9 @@ static int __init wdt_init(void)
"NCT6102",
};
/* Apply system-specific quirks */
dmi_check_system(wdt_dmi_table);
wdt_io = 0x2e;
chip = wdt_find(0x2e);
if (chip < 0) {