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authorLinus Walleij <linus.walleij@linaro.org>2013-04-08 11:38:50 +0200
committerLinus Walleij <linus.walleij@linaro.org>2013-05-31 11:25:51 +0200
commit978577ea21fb05c12511c25b71e493859e36892f (patch)
tree221022c7a9d1995da1a76a7cf2b4a193b1fff3cf /arch/arm/mach-u300
parent351c2163f918e2a4218e0206f854dbec7799fda8 (diff)
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>
Diffstat (limited to 'arch/arm/mach-u300')
-rw-r--r--arch/arm/mach-u300/core.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index a683d17b2ce..a210b1c4ccf 100644
--- 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 */