watchdog: bcm7038_wdt: add big endian support

bcm7038_wdt can be used on bmips big endian (bcm63xx) devices too.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210223080042.29569-1-noltari@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index 979caa1..acaaa00 100644 (file)
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -34,6 +34,25 @@ struct bcm7038_watchdog {
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
 
+static inline void bcm7038_wdt_write(u32 value, void __iomem *addr)
+{
+       /* MIPS chips strapped for BE will automagically configure the
+        * peripheral registers for CPU-native byte order.
+        */
+       if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+               __raw_writel(value, addr);
+       else
+               writel_relaxed(value, addr);
+}
+
+static inline u32 bcm7038_wdt_read(void __iomem *addr)
+{
+       if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+               return __raw_readl(addr);
+       else
+               return readl_relaxed(addr);
+}
+
 static void bcm7038_wdt_set_timeout_reg(struct watchdog_device *wdog)
 {
        struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
@@ -41,15 +60,15 @@ static void bcm7038_wdt_set_timeout_reg(struct watchdog_device *wdog)
 
        timeout = wdt->rate * wdog->timeout;
 
-       writel(timeout, wdt->base + WDT_TIMEOUT_REG);
+       bcm7038_wdt_write(timeout, wdt->base + WDT_TIMEOUT_REG);
 }
 
 static int bcm7038_wdt_ping(struct watchdog_device *wdog)
 {
        struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
 
-       writel(WDT_START_1, wdt->base + WDT_CMD_REG);
-       writel(WDT_START_2, wdt->base + WDT_CMD_REG);
+       bcm7038_wdt_write(WDT_START_1, wdt->base + WDT_CMD_REG);
+       bcm7038_wdt_write(WDT_START_2, wdt->base + WDT_CMD_REG);
 
        return 0;
 }
@@ -66,8 +85,8 @@ static int bcm7038_wdt_stop(struct watchdog_device *wdog)
 {
        struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
 
-       writel(WDT_STOP_1, wdt->base + WDT_CMD_REG);
-       writel(WDT_STOP_2, wdt->base + WDT_CMD_REG);
+       bcm7038_wdt_write(WDT_STOP_1, wdt->base + WDT_CMD_REG);
+       bcm7038_wdt_write(WDT_STOP_2, wdt->base + WDT_CMD_REG);
 
        return 0;
 }
@@ -88,7 +107,7 @@ static unsigned int bcm7038_wdt_get_timeleft(struct watchdog_device *wdog)
        struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
        u32 time_left;
 
-       time_left = readl(wdt->base + WDT_CMD_REG);
+       time_left = bcm7038_wdt_read(wdt->base + WDT_CMD_REG);
 
        return time_left / wdt->rate;
 }