ARM: u300: basic device tree support

This register the most basic peripherals and makes the
U300 boot to prompt from a device tree.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/arm/ste-u300.txt b/Documentation/devicetree/bindings/arm/ste-u300.txt
new file mode 100644 (file)
index 0000000..222dca5
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/ste-u300.txt
@@ -0,0 +1,9 @@
+ST-Ericsson U300 Device Tree Bindings
+
+For various board the "board" node may contain specific properties
+that pertain to this particular board, such as board-specific GPIOs
+or board power regulator supplies.
+
+Required root node property:
+
+compatible="stericsson,u300";

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index b9f7121e6ecf02c561e5b1b10308659aad23fb28..3dd1316a5a279c05cba4a9bc1786c6e969b8398c 100644 (file)
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -197,6 +197,7 @@ dtb-$(CONFIG_ARCH_TEGRA) += tegra20-harmony.dtb \
        tegra114-pluto.dtb
 dtb-$(CONFIG_ARCH_VERSATILE) += versatile-ab.dtb \
        versatile-pb.dtb
+dtb-$(CONFIG_ARCH_U300) += ste-u300.dtb
 dtb-$(CONFIG_ARCH_VEXPRESS) += vexpress-v2p-ca5s.dtb \
        vexpress-v2p-ca9.dtb \
        vexpress-v2p-ca15-tc1.dtb \

diff --git a/arch/arm/boot/dts/ste-u300.dts b/arch/arm/boot/dts/ste-u300.dts
new file mode 100644 (file)
index 0000000..9e423eb
--- /dev/null
+++ b/arch/arm/boot/dts/ste-u300.dts
@@ -0,0 +1,86 @@
+/*
+ * Device Tree for the ST-Ericsson U300 Machine and SoC
+ */
+
+/dts-v1/;
+/include/ "skeleton.dtsi"
+
+/ {
+       model = "ST-Ericsson U300";
+       compatible = "stericsson,u300";
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+       chosen {
+               bootargs = "root=/dev/ram0 console=ttyAMA0,115200n8 earlyprintk";
+       };
+
+       aliases {
+               serial0 = &uart0;
+               serial1 = &uart1;
+        };
+
+       memory {
+               reg = <0x48000000 0x03c00000>;
+       };
+
+       timer: timer@c0014000 {
+               compatible = "stericsson,u300-apptimer";
+               reg = <0xc0014000 0x1000>;
+               interrupt-parent = <&vica>;
+               interrupts = <24 25 26 27>;
+       };
+
+       gpio: gpio@c0016000 {
+               compatible = "stericsson,gpio-coh901";
+               reg = <0xc0016000 0x1000>;
+               interrupt-parent = <&vicb>;
+               interrupts = <0 1 2 18 21 22 23>;
+               interrupt-names = "gpio0", "gpio1", "gpio2", "gpio3",
+                               "gpio4", "gpio5", "gpio6";
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               gpio-controller;
+               #gpio-cells = <2>;
+       };
+
+       pinctrl: pinctrl@c0011000 {
+               compatible = "stericsson,pinctrl-u300";
+               reg = <0xc0011000 0x1000>;
+       };
+
+       amba {
+               compatible = "arm,amba-bus";
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               vica: interrupt-controller@a0001000 {
+                       compatible = "arm,versatile-vic";
+                       interrupt-controller;
+                       #interrupt-cells = <1>;
+                       reg = <0xa0001000 0x20>;
+               };
+
+               vicb: interrupt-controller@a0002000 {
+                       compatible = "arm,versatile-vic";
+                       interrupt-controller;
+                       #interrupt-cells = <1>;
+                       reg = <0xa0002000 0x20>;
+               };
+
+               uart0: serial@c0013000 {
+                       compatible = "arm,pl011", "arm,primecell";
+                       reg = <0xc0013000 0x1000>;
+                       interrupt-parent = <&vica>;
+                       interrupts = <22>;
+               };
+
+               uart1: serial@c0007000 {
+                       compatible = "arm,pl011", "arm,primecell";
+                       reg = <0xc0007000 0x1000>;
+                       interrupt-parent = <&vicb>;
+                       interrupts = <20>;
+               };
+       };
+};

diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index a683d17b2ce43ad5380186eaaa214f862f6748b7..a210b1c4ccf48c445e501563567f85aecbcf47ba 100644 (file)
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -33,6 +33,9 @@
 #include <linux/platform_data/pinctrl-coh901.h>
 #include <linux/platform_data/dma-coh901318.h>
 #include <linux/irqchip/arm-vic.h>
+#include <linux/irqchip.h>
+#include <linux/of_platform.h>
+#include <linux/clocksource.h>
 
 #include <asm/types.h>
 #include <asm/setup.h>
@@ -698,3 +701,81 @@ MACHINE_START(U300, "Ericsson AB U335 S335/B335 Prototype Board")
        .init_machine   = u300_init_machine,
        .restart        = u300_restart,
 MACHINE_END
+
+#ifdef CONFIG_OF
+
+/* These are mostly to get the right device names for the clock lookups */
+static struct of_dev_auxdata u300_auxdata_lookup[] __initdata = {
+       OF_DEV_AUXDATA("stericsson,pinctrl-u300", U300_SYSCON_BASE,
+               "pinctrl-u300", NULL),
+       OF_DEV_AUXDATA("stericsson,gpio-coh901", U300_GPIO_BASE,
+               "u300-gpio", &u300_gpio_plat),
+       OF_DEV_AUXDATA("arm,primecell", U300_UART0_BASE,
+               "uart0", &uart0_plat_data),
+       OF_DEV_AUXDATA("arm,primecell", U300_UART1_BASE,
+               "uart1", &uart1_plat_data),
+       OF_DEV_AUXDATA("arm,primecell", U300_MMCSD_BASE,
+               "mmci", &mmcsd_platform_data),
+       { /* sentinel */ },
+};
+
+static void __init u300_init_irq_dt(void)
+{
+       struct clk *clk;
+
+       /* initialize clocking early, we want to clock the INTCON */
+       u300_clk_init(U300_SYSCON_VBASE);
+
+       /* Bootstrap EMIF and SEMI clocks */
+       clk = clk_get_sys("pl172", NULL);
+       BUG_ON(IS_ERR(clk));
+       clk_prepare_enable(clk);
+       clk = clk_get_sys("semi", NULL);
+       BUG_ON(IS_ERR(clk));
+       clk_prepare_enable(clk);
+
+       /* Clock the interrupt controller */
+       clk = clk_get_sys("intcon", NULL);
+       BUG_ON(IS_ERR(clk));
+       clk_prepare_enable(clk);
+
+       irqchip_init();
+}
+
+static void __init u300_init_machine_dt(void)
+{
+       u16 val;
+
+       /* Check what platform we run and print some status information */
+       u300_init_check_chip();
+
+       u300_assign_physmem();
+
+       /* Initialize pinmuxing */
+       pinctrl_register_mappings(u300_pinmux_map,
+                                 ARRAY_SIZE(u300_pinmux_map));
+
+       of_platform_populate(NULL, of_default_bus_match_table,
+                       u300_auxdata_lookup, NULL);
+
+       /* Enable SEMI self refresh */
+       val = readw(U300_SYSCON_VBASE + U300_SYSCON_SMCR) |
+               U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;
+       writew(val, U300_SYSCON_VBASE + U300_SYSCON_SMCR);
+}
+
+static const char * u300_board_compat[] = {
+       "stericsson,u300",
+       NULL,
+};
+
+DT_MACHINE_START(U300_DT, "U300 S335/B335 (Device Tree)")
+       .map_io         = u300_map_io,
+       .init_irq       = u300_init_irq_dt,
+       .init_time      = clocksource_of_init,
+       .init_machine   = u300_init_machine_dt,
+       .restart        = u300_restart,
+       .dt_compat      = u300_board_compat,
+MACHINE_END
+
+#endif /* CONFIG_OF */