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Subject[PATCHv3 04/10] ARM: sun6i: Add restart code for the A31
Date
The Allwinner A31 has a different watchdog, with a slightly different
register layout, that requires a different restart code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
.../devicetree/bindings/watchdog/sun4i-wdt.txt | 13 -------
.../devicetree/bindings/watchdog/sunxi-wdt.txt | 14 +++++++
arch/arm/mach-sunxi/sunxi.c | 43 ++++++++++++++++++++--
3 files changed, 54 insertions(+), 16 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt
create mode 100644 Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt

diff --git a/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt b/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt
deleted file mode 100644
index ecd650a..0000000
--- a/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-Allwinner sun4i Watchdog timer
-
-Required properties:
-
-- compatible : should be "allwinner,sun4i-wdt"
-- reg : Specifies base physical address and size of the registers.
-
-Example:
-
-wdt: watchdog@01c20c90 {
- compatible = "allwinner,sun4i-wdt";
- reg = <0x01c20c90 0x10>;
-};
diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
new file mode 100644
index 0000000..e39cb26
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
@@ -0,0 +1,14 @@
+Allwinner SoCs Watchdog timer
+
+Required properties:
+
+- compatible : should be "allwinner,<soc-family>-wdt", the currently supported
+ SoC families being sun4i and sun6i
+- reg : Specifies base physical address and size of the registers.
+
+Example:
+
+wdt: watchdog@01c20c90 {
+ compatible = "allwinner,sun4i-wdt";
+ reg = <0x01c20c90 0x10>;
+};
diff --git a/arch/arm/mach-sunxi/sunxi.c b/arch/arm/mach-sunxi/sunxi.c
index 11326d9..19bcc96 100644
--- a/arch/arm/mach-sunxi/sunxi.c
+++ b/arch/arm/mach-sunxi/sunxi.c
@@ -27,10 +27,19 @@
#include <asm/system_misc.h>

#define SUN4I_WATCHDOG_CTRL_REG 0x00
-#define SUN4I_WATCHDOG_CTRL_RESTART (1 << 0)
+#define SUN4I_WATCHDOG_CTRL_RESTART BIT(0)
#define SUN4I_WATCHDOG_MODE_REG 0x04
-#define SUN4I_WATCHDOG_MODE_ENABLE (1 << 0)
-#define SUN4I_WATCHDOG_MODE_RESET_ENABLE (1 << 1)
+#define SUN4I_WATCHDOG_MODE_ENABLE BIT(0)
+#define SUN4I_WATCHDOG_MODE_RESET_ENABLE BIT(1)
+
+#define SUN6I_WATCHDOG1_IRQ_REG 0x00
+#define SUN6I_WATCHDOG1_CTRL_REG 0x10
+#define SUN6I_WATCHDOG1_CTRL_RESTART BIT(0)
+#define SUN6I_WATCHDOG1_CONFIG_REG 0x14
+#define SUN6I_WATCHDOG1_CONFIG_RESTART BIT(0)
+#define SUN6I_WATCHDOG1_CONFIG_IRQ BIT(1)
+#define SUN6I_WATCHDOG1_MODE_REG 0x18
+#define SUN6I_WATCHDOG1_MODE_ENABLE BIT(0)

static void __iomem *wdt_base;

@@ -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*/ }
};

--
1.8.3.4


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