Merge branch 'sunxi/soc2' into next/soc

From Maxime Ripard:

Here is a pull request to add the support for Allwinner A10 SoCs.

* sunxi/soc2:
  ARM: sunxi: Add sunxi restart function via onchip watchdog
  ARM: sunxi: Add sun4i and cubieboard support
  ARM: sunxi: Add earlyprintk support for UART0 (sun4i)
  ARM: sunxi: Restructure sunxi dts/dtsi files

Signed-off-by: Olof Johansson <olof@lixom.net>

9 files changed, 186 insertions, 59 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
new file mode 100644
index 000000000000..0b2717775600
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt
@@ -0,0 +1,13 @@
+Allwinner sunXi Watchdog timer
+
+Required properties:
+
+- compatible : should be "allwinner,sunxi-wdt"
+- reg : Specifies base physical address and size of the registers.
+
+Example:
+
+wdt: watchdog@01c20c90 {
+        compatible = "allwinner,sunxi-wdt";
+        reg = <0x01c20c90 0x10>;
+};
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 4c336c3c4d7e..6783273f9e0b 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -345,6 +345,13 @@ choice
                   Say Y here if you want kernel low-level debugging support
                   on SOCFPGA based platforms.
 
+        config DEBUG_SUNXI_UART0
+                bool "Kernel low-level debugging messages via sunXi UART0"
+                depends on ARCH_SUNXI
+                help
+                  Say Y here if you want kernel low-level debugging support
+                  on Allwinner A1X based platforms on the UART0.
+
         config DEBUG_SUNXI_UART1
                 bool "Kernel low-level debugging messages via sunXi UART1"
                 depends on ARCH_SUNXI
@@ -431,7 +438,7 @@ config DEBUG_LL_INCLUDE
         default "debug/mvebu.S" if DEBUG_MVEBU_UART
         default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
         default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
-        default "debug/sunxi.S" if DEBUG_SUNXI_UART1
+        default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
         default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
                 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
         default "mach/debug-macro.S"
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 22e4ac9a4e7d..8585bc0d5c0a 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -86,7 +86,8 @@ dtb-$(CONFIG_ARCH_SPEAR3XX)+= spear300-evb.dtb \
         spear310-evb.dtb \
         spear320-evb.dtb
 dtb-$(CONFIG_ARCH_SPEAR6XX)+= spear600-evb.dtb
-dtb-$(CONFIG_ARCH_SUNXI) += sun5i-olinuxino.dtb
+dtb-$(CONFIG_ARCH_SUNXI) += sun4i-cubieboard.dtb \
+        sun5i-olinuxino.dtb
 dtb-$(CONFIG_ARCH_TEGRA) += tegra20-harmony.dtb \
         tegra20-medcom-wide.dtb \
         tegra20-paz00.dtb \
diff --git a/arch/arm/boot/dts/sun4i-cubieboard.dts b/arch/arm/boot/dts/sun4i-cubieboard.dts
new file mode 100644
index 000000000000..f4ca126ad994
--- /dev/null
+++ b/arch/arm/boot/dts/sun4i-cubieboard.dts
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012 Stefan Roese
+ * Stefan Roese <sr@denx.de>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+/include/ "sun4i.dtsi"
+
+/ {
+        model = "Cubietech Cubieboard";
+        compatible = "cubietech,cubieboard", "allwinner,sun4i";
+
+        aliases {
+                serial0 = &uart0;
+                serial1 = &uart1;
+        };
+
+        chosen {
+                bootargs = "earlyprintk console=ttyS0,115200";
+        };
+
+        soc {
+                uart0: uart@01c28000 {
+                        status = "okay";
+                };
+
+                uart1: uart@01c28400 {
+                        status = "okay";
+                };
+        };
+};
diff --git a/arch/arm/boot/dts/sun5i-olinuxino.dts b/arch/arm/boot/dts/sun5i-olinuxino.dts
index 3b1cce3af7cb..d6ff889a5d87 100644
--- a/arch/arm/boot/dts/sun5i-olinuxino.dts
+++ b/arch/arm/boot/dts/sun5i-olinuxino.dts
@@ -18,8 +18,12 @@
         model = "Olimex A13-Olinuxino";
         compatible = "olimex,a13-olinuxino", "allwinner,sun5i";
 
+        chosen {
+                bootargs = "earlyprintk console=ttyS0,115200";
+        };
+
         soc {
-                duart: uart@01c28400 {
+                uart1: uart@01c28400 {
                         status = "okay";
                 };
         };
diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi
index 4bedf3e826e8..59a2d265a98e 100644
--- a/arch/arm/boot/dts/sun5i.dtsi
+++ b/arch/arm/boot/dts/sun5i.dtsi
@@ -11,64 +11,10 @@
  * http://www.gnu.org/copyleft/gpl.html
  */
 
-/include/ "skeleton.dtsi"
+/include/ "sunxi.dtsi"
 
 / {
-        interrupt-parent = <&intc>;
-
-        cpus {
-                cpu@0 {
-                        compatible = "arm,cortex-a8";
-                };
-        };
-
-        chosen {
-                bootargs = "earlyprintk console=ttyS0,115200";
-        };
-
         memory {
                 reg = <0x40000000 0x20000000>;
         };
-
-        clocks {
-                #address-cells = <1>;
-                #size-cells = <0>;
-
-                osc: oscillator {
-                        #clock-cells = <0>;
-                        compatible = "fixed-clock";
-                        clock-frequency = <24000000>;
-                };
-        };
-
-        soc {
-                compatible = "simple-bus";
-                #address-cells = <1>;
-                #size-cells = <1>;
-                reg = <0x01c20000 0x300000>;
-                ranges;
-
-                timer@01c20c00 {
-                        compatible = "allwinner,sunxi-timer";
-                        reg = <0x01c20c00 0x400>;
-                        interrupts = <22>;
-                        clocks = <&osc>;
-                };
-
-                intc: interrupt-controller@01c20400 {
-                        compatible = "allwinner,sunxi-ic";
-                        reg = <0x01c20400 0x400>;
-                        interrupt-controller;
-                        #interrupt-cells = <1>;
-                };
-
-                uart1: uart@01c28400 {
-                        compatible = "ns8250";
-                        reg = <0x01c28400 0x400>;
-                        interrupts = <2>;
-                        reg-shift = <2>;
-                        clock-frequency = <24000000>;
-                        status = "disabled";
-                };
-        };
 };
diff --git a/arch/arm/boot/dts/sunxi.dtsi b/arch/arm/boot/dts/sunxi.dtsi
new file mode 100644
index 000000000000..8bbc2bfef221
--- /dev/null
+++ b/arch/arm/boot/dts/sunxi.dtsi
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2012 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/include/ "skeleton.dtsi"
+
+/ {
+        interrupt-parent = <&intc>;
+
+        cpus {
+                cpu@0 {
+                        compatible = "arm,cortex-a8";
+                };
+        };
+
+        clocks {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                osc: oscillator {
+                        #clock-cells = <0>;
+                        compatible = "fixed-clock";
+                        clock-frequency = <24000000>;
+                };
+        };
+
+        soc {
+                compatible = "simple-bus";
+                #address-cells = <1>;
+                #size-cells = <1>;
+                reg = <0x01c20000 0x300000>;
+                ranges;
+
+                timer@01c20c00 {
+                        compatible = "allwinner,sunxi-timer";
+                        reg = <0x01c20c00 0x90>;
+                        interrupts = <22>;
+                        clocks = <&osc>;
+                };
+
+                wdt: watchdog@01c20c90 {
+                        compatible = "allwinner,sunxi-wdt";
+                        reg = <0x01c20c90 0x10>;
+                };
+
+                intc: interrupt-controller@01c20400 {
+                        compatible = "allwinner,sunxi-ic";
+                        reg = <0x01c20400 0x400>;
+                        interrupt-controller;
+                        #interrupt-cells = <1>;
+                };
+
+                uart0: uart@01c28000 {
+                        compatible = "ns8250";
+                        reg = <0x01c28000 0x400>;
+                        interrupts = <1>;
+                        reg-shift = <2>;
+                        clock-frequency = <24000000>;
+                        status = "disabled";
+                };
+
+                uart1: uart@01c28400 {
+                        compatible = "ns8250";
+                        reg = <0x01c28400 0x400>;
+                        interrupts = <2>;
+                        reg-shift = <2>;
+                        clock-frequency = <24000000>;
+                        status = "disabled";
+                };
+        };
+};
diff --git a/arch/arm/include/debug/sunxi.S b/arch/arm/include/debug/sunxi.S
index 3bf61ca0df75..04eb56d5db2c 100644
--- a/arch/arm/include/debug/sunxi.S
+++ b/arch/arm/include/debug/sunxi.S
@@ -10,7 +10,10 @@
  * published by the Free Software Foundation.
 */
 
-#ifdef CONFIG_DEBUG_SUNXI_UART1
+#if defined(CONFIG_DEBUG_SUNXI_UART0)
+#define SUNXI_UART_DEBUG_PHYS_BASE 0x01c28000
+#define SUNXI_UART_DEBUG_VIRT_BASE 0xf1c28000
+#elif defined(CONFIG_DEBUG_SUNXI_UART1)
 #define SUNXI_UART_DEBUG_PHYS_BASE 0x01c28400
 #define SUNXI_UART_DEBUG_VIRT_BASE 0xf1c28400
 #endif
diff --git a/arch/arm/mach-sunxi/sunxi.c b/arch/arm/mach-sunxi/sunxi.c
index 8f42df8af1da..dc634ae2081f 100644
--- a/arch/arm/mach-sunxi/sunxi.c
+++ b/arch/arm/mach-sunxi/sunxi.c
@@ -12,6 +12,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/io.h>
@@ -26,6 +27,36 @@
 
 #include "sunxi.h"
 
+#define WATCHDOG_CTRL_REG       0x00
+#define WATCHDOG_MODE_REG       0x04
+
+static void __iomem *wdt_base;
+
+static void sunxi_setup_restart(void)
+{
+        struct device_node *np = of_find_compatible_node(NULL, NULL,
+                                                "allwinner,sunxi-wdt");
+        if (WARN(!np, "unable to setup watchdog restart"))
+                return;
+
+        wdt_base = of_iomap(np, 0);
+        WARN(!wdt_base, "failed to map watchdog base address");
+}
+
+static void sunxi_restart(char mode, const char *cmd)
+{
+        if (!wdt_base)
+                return;
+
+        /* Enable timer and set reset bit in the watchdog */
+        writel(3, wdt_base + WATCHDOG_MODE_REG);
+        writel(0xa57 << 1 | 1, wdt_base + WATCHDOG_CTRL_REG);
+        while(1) {
+                mdelay(5);
+                writel(3, wdt_base + WATCHDOG_MODE_REG);
+        }
+}
+
 static struct map_desc sunxi_io_desc[] __initdata = {
         {
                 .virtual        = (unsigned long) SUNXI_REGS_VIRT_BASE,
@@ -42,10 +73,13 @@ void __init sunxi_map_io(void)
 
 static void __init sunxi_dt_init(void)
 {
+        sunxi_setup_restart();
+
         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }
 
 static const char * const sunxi_board_dt_compat[] = {
+        "allwinner,sun4i",
         "allwinner,sun5i",
         NULL,
 };
@@ -55,6 +89,7 @@ DT_MACHINE_START(SUNXI_DT, "Allwinner A1X (Device Tree)")
         .map_io         = sunxi_map_io,
         .init_irq       = sunxi_init_irq,
         .handle_irq     = sunxi_handle_irq,
+        .restart        = sunxi_restart,
         .timer          = &sunxi_timer,
         .dt_compat      = sunxi_board_dt_compat,
 MACHINE_END