ARM: EXYNOS: add device tree support for MCT controller driver

Allow the MCT controller base address and interrupts to be
obtained from device tree and remove unused static definitions
of these. The non-dt support for Exynos5250 is removed but
retained for Exynos4210 based platforms.

Cc: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 37 insertions, 12 deletions

diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index 1061db4118aa..f34c933314f3 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -20,6 +20,8 @@
 #include <linux/delay.h>
 #include <linux/percpu.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
 
 #include <asm/arch_timer.h>
 #include <asm/localtimer.h>
@@ -474,14 +476,16 @@ static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {
 };
 #endif /* CONFIG_LOCAL_TIMERS */
 
-static void __init exynos4_timer_resources(void)
+static void __init exynos4_timer_resources(struct device_node *np)
 {
 	struct clk *mct_clk;
 	mct_clk = clk_get(NULL, "xtal");
 
 	clk_rate = clk_get_rate(mct_clk);
 
-	reg_base = S5P_VA_SYSTIMER;
+	reg_base = np ? of_iomap(np, 0) : S5P_VA_SYSTIMER;
+	if (!reg_base)
+		panic("%s: unable to ioremap mct address space\n", __func__);
 
 #ifdef CONFIG_LOCAL_TIMERS
 	if (mct_int_type == MCT_INT_PPI) {
@@ -498,30 +502,51 @@ static void __init exynos4_timer_resources(void)
 #endif /* CONFIG_LOCAL_TIMERS */
 }
 
+static const struct of_device_id exynos_mct_ids[] = {
+	{ .compatible = "samsung,exynos4210-mct", .data = (void *)MCT_INT_SPI },
+	{ .compatible = "samsung,exynos4412-mct", .data = (void *)MCT_INT_PPI },
+};
+
 void __init exynos4_timer_init(void)
 {
+	struct device_node *np = NULL;
+	const struct of_device_id *match;
+	u32 nr_irqs, i;
+
 	if (soc_is_exynos5440()) {
 		arch_timer_of_register();
 		return;
 	}
 
-	if (soc_is_exynos4210()) {
+#ifdef CONFIG_OF
+	np = of_find_matching_node_and_match(NULL, exynos_mct_ids, &match);
+#endif
+	if (np) {
+		mct_int_type = (u32)(match->data);
+
+		/* This driver uses only one global timer interrupt */
+		mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
+
+		/*
+		 * Find out the number of local irqs specified. The local
+		 * timer irqs are specified after the four global timer
+		 * irqs are specified.
+		 */
+#ifdef CONFIG_OF
+		nr_irqs = of_irq_count(np);
+#endif
+		for (i = MCT_L0_IRQ; i < nr_irqs; i++)
+			mct_irqs[i] = irq_of_parse_and_map(np, i);
+	} else if (soc_is_exynos4210()) {
 		mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
 		mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0;
 		mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1;
 		mct_int_type = MCT_INT_SPI;
-	} else if (soc_is_exynos5250()) {
-		mct_irqs[MCT_G0_IRQ] = EXYNOS5_IRQ_MCT_G0;
-		mct_irqs[MCT_L0_IRQ] = EXYNOS5_IRQ_MCT_L0;
-		mct_irqs[MCT_L1_IRQ] = EXYNOS5_IRQ_MCT_L1;
-		mct_int_type = MCT_INT_SPI;
 	} else {
-		mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
-		mct_irqs[MCT_L0_IRQ] = EXYNOS_IRQ_MCT_LOCALTIMER;
-		mct_int_type = MCT_INT_PPI;
+		panic("unable to determine mct controller type\n");
 	}
 
-	exynos4_timer_resources();
+	exynos4_timer_resources(np);
 	exynos4_clocksource_init();
 	exynos4_clockevent_init();
 }