diff options
| author | Christopher Bostic | 2017-07-17 14:25:39 -0500 |
|---|---|---|
| committer | Wim Van Sebroeck | 2017-09-09 21:04:59 +0200 |
| commit | b7f0b8ad25f3f19f7830b3ce5b8fa6f7fe7ae5d5 (patch) | |
| tree | 6033bb841ee6088e74568bd0d67a07324e515f22 /drivers/watchdog | |
| parent | a1f2a82072ea298ae91505c213f6d299ddb5e446 (diff) | |
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>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/aspeed_wdt.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c index 1c652582de40..c707ab647922 100644 --- a/drivers/watchdog/aspeed_wdt.c +++ b/drivers/watchdog/aspeed_wdt.c @@ -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); |