bmips: backport accepted watchdog patch

This patch has been accepted for linux v5.14.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bmips/patches-5.10/080-v5.14-watchdog-bcm7038_wdt-add-big-endian-support.patch

@@ -0,0 +1,86 @@
+From e379c2199de4280243e43118dceb4ea5e97059a3 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
+Date: Tue, 23 Feb 2021 09:00:42 +0100
+Subject: [PATCH] watchdog: bcm7038_wdt: add big endian support
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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>
+---
+ drivers/watchdog/bcm7038_wdt.c | 31 +++++++++++++++++++++++++------
+ 1 file changed, 25 insertions(+), 6 deletions(-)
+
+--- 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(
+
+ 	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 watch
+ {
+ 	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_time
+ 	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;
+ }