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authorJean Delvare <jdelvare@suse.de>2018-11-19 08:17:38 (GMT)
committerWim Van Sebroeck <wim@linux-watchdog.org>2018-12-09 14:03:28 (GMT)
commit31eb42bd9353c807522697ddc2a6ab14b4924fa5 (patch)
treeaa020152d15f871eb0afcbd33baccc7fff6926c9 /drivers/watchdog
parent06f8f2ca0585ea0c8df7e6c65659b1f679b4254b (diff)
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>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/w83627hf_wdt.c38
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 4b9365d..3a49ba9 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -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) {

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