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drivers/watchdog: ASPEED reference dev tree properties for config 

Reference the system device tree when configuring the watchdog
engines. If property 'aspeed,reset_type' is present then set
reset behavior based on the specified value.  This can be one of
three different mutually exclusive values
  * cpu - Reset CPU only on watchdog timeout
  * soc - Reset System on Chip
  * system - Full system reset

No reset can also be specified by indicating:
  * none - No reset, assumes another watchdog is responsible for
           this.

Add optional property 'aspeed,external-signal'. If present then
configure to generate external signal on watchdog timeout.

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Christopher Bostic 2017-07-17 14:25:39 -05:00 committed by Wim Van Sebroeck
parent a1f2a82072
commit b7f0b8ad25
1 changed files with 24 additions and 5 deletions
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29
drivers/watchdog/aspeed_wdt.c
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@ -36,6 +36,7 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
#define WDT_CTRL 0x0C
#define WDT_CTRL_RESET_MODE_SOC (0x00 << 5)
#define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5)
#define WDT_CTRL_RESET_MODE_ARM_CPU (0x10 << 5)
#define WDT_CTRL_1MHZ_CLK BIT(4)
#define WDT_CTRL_WDT_EXT BIT(3)
#define WDT_CTRL_WDT_INTR BIT(2)
@ -140,6 +141,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
{
struct aspeed_wdt *wdt;
struct resource *res;
struct device_node *np;
const char *reset_type;
int ret;
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
@ -164,14 +167,30 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
watchdog_init_timeout(&wdt->wdd, 0, &pdev->dev);
wdt->ctrl = WDT_CTRL_1MHZ_CLK;
/*
* Control reset on a per-device basis to ensure the
* host is not affected by a BMC reboot, so only reset
* the SOC and not the full chip
* host is not affected by a BMC reboot
*/
wdt->ctrl = WDT_CTRL_RESET_MODE_SOC |
WDT_CTRL_1MHZ_CLK |
WDT_CTRL_RESET_SYSTEM;
np = pdev->dev.of_node;
ret = of_property_read_string(np, "aspeed,reset-type", &reset_type);
if (ret) {
wdt->ctrl |= WDT_CTRL_RESET_MODE_SOC | WDT_CTRL_RESET_SYSTEM;
} else {
if (!strcmp(reset_type, "cpu"))
wdt->ctrl |= WDT_CTRL_RESET_MODE_ARM_CPU;
else if (!strcmp(reset_type, "soc"))
wdt->ctrl |= WDT_CTRL_RESET_MODE_SOC;
else if (!strcmp(reset_type, "system"))
wdt->ctrl |= WDT_CTRL_RESET_SYSTEM;
else if (strcmp(reset_type, "none"))
return -EINVAL;
}
if (of_property_read_bool(np, "aspeed,external-signal"))
wdt->ctrl |= WDT_CTRL_WDT_EXT;
writel(wdt->ctrl, wdt->base + WDT_CTRL);
if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE) {
aspeed_wdt_start(&wdt->wdd);