The Allwinner A31 has a sligthly different watchdog that requires a
different restart code.
Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
---
arch/arm/mach-sunxi/sunxi.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/arch/arm/mach-sunxi/sunxi.c b/arch/arm/mach-sunxi/sunxi.c
index 11326d9..c18ef3a 100644
--- a/arch/arm/mach-sunxi/sunxi.c
+++ b/arch/arm/mach-sunxi/sunxi.c
@@ -32,6 +32,15 @@
#define SUN4I_WATCHDOG_MODE_ENABLE (1 << 0)
#define SUN4I_WATCHDOG_MODE_RESET_ENABLE (1 << 1)
+#define SUN6I_WATCHDOG1_IRQ_REG 0x00
+#define SUN6I_WATCHDOG1_CTRL_REG 0x10
+#define SUN6I_WATCHDOG1_CTRL_RESTART (1 << 0)
+#define SUN6I_WATCHDOG1_CONFIG_REG 0x14
+#define SUN6I_WATCHDOG1_CONFIG_RESTART (1 << 0)
+#define SUN6I_WATCHDOG1_CONFIG_IRQ (1 << 1)
+#define SUN6I_WATCHDOG1_MODE_REG 0x18
+#define SUN6I_WATCHDOG1_MODE_ENABLE (1 << 0)
+
static void __iomem *wdt_base;
static void sun4i_restart(enum reboot_mode mode, const char *cmd)
@@ -56,8 +65,36 @@ static void sun4i_restart(enum reboot_mode mode, const char
*cmd)
}
}
+static void sun6i_restart(char mode, const char *cmd)
+{
+ if (!wdt_base)
+ return;
+
+ /* Disable interrupts */
+ writel(0, wdt_base + SUN6I_WATCHDOG1_IRQ_REG);
+
+ /* We want to disable the IRQ and just reset the whole system */
+ writel(SUN6I_WATCHDOG1_CONFIG_RESTART,
+ wdt_base + SUN6I_WATCHDOG1_CONFIG_REG);
+
+ /* Enable timer. The default and lowest interval value is 0.5s */
+ writel(SUN6I_WATCHDOG1_MODE_ENABLE,
+ wdt_base + SUN6I_WATCHDOG1_MODE_REG);
+
+ /* Restart the watchdog. */
+ writel(SUN6I_WATCHDOG1_CTRL_RESTART,
+ wdt_base + SUN6I_WATCHDOG1_CTRL_REG);
+
+ while (1) {
+ mdelay(5);
+ writel(SUN6I_WATCHDOG1_MODE_ENABLE,
+ wdt_base + SUN6I_WATCHDOG1_MODE_REG);
+ }
+}
+
static struct of_device_id sunxi_restart_ids[] = {
{ .compatible = "allwinner,sun4i-wdt", .data = sun4i_restart },
+ { .compatible = "allwinner,sun6i-wdt", .data = sun6i_restart },
{ /*sentinel*/ }
};
--
1.8.3.2
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