From 6ffa3402211acc30e47e691e14d62f3fd065a54e Mon Sep 17 00:00:00 2001 From: Milton Miller Date: Thu, 15 Mar 2018 11:02:06 -0500 Subject: watchdog: aspeed: Allow configuring for alternate boot Allow the device tree to specify a watchdog to fallover to the alternate boot source. The aspeeed watchdog can set a latch directing flash chip select 0 to chip select 1, allowing boot from an alternate media if the watchdog is not reset in time. On the ast2400 bank 1 also goes to flash bank 1, while on the ast2500 the chip selects are swapped. Also clear the secondary boot bit during the machine restart operation. Otherwise, the system will switch to the alternate boot after every reboot, which is not desired. Signed-off-by: Milton Miller Signed-off-by: Eddie James Reviewed-by: Joel Stanley Reviewed-by: Guenter Roeck Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/aspeed_wdt.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/watchdog') diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c index ca5b91e..65f2320 100644 --- a/drivers/watchdog/aspeed_wdt.c +++ b/drivers/watchdog/aspeed_wdt.c @@ -46,6 +46,7 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table); #define WDT_RELOAD_VALUE 0x04 #define WDT_RESTART 0x08 #define WDT_CTRL 0x0C +#define WDT_CTRL_BOOT_SECONDARY BIT(7) #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) @@ -158,6 +159,7 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd, { struct aspeed_wdt *wdt = to_aspeed_wdt(wdd); + wdt->ctrl &= ~WDT_CTRL_BOOT_SECONDARY; aspeed_wdt_enable(wdt, 128 * WDT_RATE_1MHZ / 1000); mdelay(1000); @@ -242,6 +244,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev) } if (of_property_read_bool(np, "aspeed,external-signal")) wdt->ctrl |= WDT_CTRL_WDT_EXT; + if (of_property_read_bool(np, "aspeed,alt-boot")) + wdt->ctrl |= WDT_CTRL_BOOT_SECONDARY; if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE) { /* -- cgit v1.1