[PATCH 17/20] ARM: Exynos: Add device tree support for gpio wakeup interrupt controller

[Thomas Abraham]

Add device tree support for gpio wakeup source interrupt controller
for Exynos platforms.

Cc: Rob Herring <rob.herring at calxeda.com>
Cc: Grant Likely <grant.likely at secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abraham at linaro.org>
---
 arch/arm/mach-exynos/common.c |   92 +++++++++++++++++++++++++++++++++++------
 1 files changed, 79 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 544f8b5..074508f 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -64,7 +64,8 @@ static void exynos4_init_clocks(int xtal);
 static void exynos5_init_clocks(int xtal);
 static void exynos_init_uarts(struct s3c2410_uartcfg *cfg, int no);
 static int exynos_init(void);
-static int exynos_init_irq_eint(void);
+static int exynos_init_irq_eint(struct device_node *np,
+				struct device_node *parent);
 
 static struct cpu_table cpu_ids[] __initdata = {
 	{
@@ -589,6 +590,8 @@ static const struct of_device_id exynos4_dt_irq_match[] = {
 	{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 	{ .compatible = "samsung,exynos4210-combiner",
 			.data = combiner_of_init, },
+	{ .compatible = "samsung,exynos5210-wakeup-eint-map",
+			.data = exynos_init_irq_eint, },
 	{},
 };
 #endif
@@ -606,8 +609,10 @@ void __init exynos4_init_irq(void)
 		of_irq_init(exynos4_dt_irq_match);
 #endif
 
-	if (!of_have_populated_dt())
+	if (!of_have_populated_dt()) {
 		combiner_init(S5P_VA_COMBINER_BASE, NULL);
+		exynos_init_irq_eint(NULL, NULL);
+	}
 
 	/*
 	 * The parameters of s5p_init_irq() are for VIC init.
@@ -615,7 +620,6 @@ void __init exynos4_init_irq(void)
 	 * uses GIC instead of VIC.
 	 */
 	s5p_init_irq(NULL, 0);
-	exynos_init_irq_eint();
 }
 
 void __init exynos5_init_irq(void)
@@ -629,7 +633,6 @@ void __init exynos5_init_irq(void)
 	 * uses GIC instead of VIC.
 	 */
 	s5p_init_irq(NULL, 0);
-	exynos_init_irq_eint();
 }
 
 struct bus_type exynos_subsys = {
@@ -1002,17 +1005,72 @@ static int exynos_eint_irq_domain_map(struct irq_domain *d, unsigned int irq,
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static int exynos_eint_irq_domain_xlate(struct irq_domain *d,
+		struct device_node *controller, const u32 *intspec,
+		unsigned int intsize, unsigned long *out_hwirq,
+		unsigned int *out_type)
+{
+	if (d->of_node != controller)
+		return -EINVAL;
+	if (intsize < 2)
+		return -EINVAL;
+	*out_hwirq = intspec[0];
+
+	switch (intspec[1]) {
+	case S5P_IRQ_TYPE_LEVEL_LOW:
+		*out_type = IRQ_TYPE_LEVEL_LOW;
+		break;
+	case S5P_IRQ_TYPE_LEVEL_HIGH:
+		*out_type = IRQ_TYPE_LEVEL_HIGH;
+		break;
+	case S5P_IRQ_TYPE_EDGE_FALLING:
+		*out_type = IRQ_TYPE_EDGE_FALLING;
+		break;
+	case S5P_IRQ_TYPE_EDGE_RISING:
+		*out_type = IRQ_TYPE_EDGE_RISING;
+		break;
+	case S5P_IRQ_TYPE_EDGE_BOTH:
+		*out_type = IRQ_TYPE_EDGE_BOTH;
+		break;
+	};
+
+	return 0;
+}
+#else
+static int exynos_eint_irq_domain_xlate(struct irq_domain *d,
+		struct device_node *controller, const u32 *intspec,
+		unsigned int intsize, unsigned long *out_hwirq,
+		unsigned int *out_type)
+{
+	return -EINVAL;
+}
+#endif
+
 static struct irq_domain_ops exynos_eint_irq_domain_ops = {
+	.xlate = exynos_eint_irq_domain_xlate,
 	.map = exynos_eint_irq_domain_map,
 };
 
-static int __init exynos_init_irq_eint(void)
+static int __init exynos_init_irq_eint(struct device_node *eint_np,
+					struct device_node *parent)
 {
-	int irq, *src_int, irq_base;
+	int irq, *src_int, irq_base, irq_eint;
 	unsigned int paddr;
+	static unsigned int retry = 0;
+	static struct device_node *np;
 
-	paddr = soc_is_exynos5250() ? EXYNOS5_PA_GPIO1 : EXYNOS4_PA_GPIO2;
-	exynos_eint_base = ioremap(paddr, SZ_4K);
+	if (retry)
+		goto retry_init;
+
+	if (!eint_np) {
+		paddr = soc_is_exynos5250() ? EXYNOS5_PA_GPIO1 :
+						EXYNOS4_PA_GPIO2;
+		exynos_eint_base = ioremap(paddr, SZ_4K);
+	} else {
+		np = of_get_parent(eint_np);
+		exynos_eint_base = of_iomap(np, 0);
+	}
 	if (!exynos_eint_base) {
 		pr_err("unable to ioremap for EINT base address\n");
 		return -ENXIO;
@@ -1025,21 +1083,29 @@ static int __init exynos_init_irq_eint(void)
 				"linux irq base\n", __func__, irq_base);
 	}
 
-	irq_domain = irq_domain_add_legacy(NULL, EXYNOS_EINT_NR, irq_base, 0,
+	irq_domain = irq_domain_add_legacy(np, EXYNOS_EINT_NR, irq_base, 0,
 					 &exynos_eint_irq_domain_ops, NULL);
 	if (WARN_ON(!irq_domain)) {
 		pr_warning("%s: irq domain init failed\n", __func__);
 		return 0;
 	}
 
-	irq_set_chained_handler(EXYNOS_IRQ_EINT16_31, exynos_irq_demux_eint16_31);
+	irq_eint = eint_np ? irq_of_parse_and_map(np, 16) : EXYNOS_IRQ_EINT16_31;
+	irq_set_chained_handler(irq_eint, exynos_irq_demux_eint16_31);
 
-	for (irq = 0 ; irq <= 15; irq++) {
+retry_init:
+	for (irq = 0; irq <= 15; irq++) {
 		eint0_15_data[irq] = irq;
 		src_int = soc_is_exynos5250() ? exynos5_eint0_15_src_int :
 						exynos4_eint0_15_src_int;
-		irq_set_handler_data(src_int[irq], &eint0_15_data[irq]);
-		irq_set_chained_handler(src_int[irq], exynos_irq_eint0_15);
+		irq_eint = eint_np ? irq_of_parse_and_map(np, irq) : src_int[irq];
+		if (!irq_eint) {
+			of_node_put(np);
+			retry = 1;
+			return -EAGAIN;
+		}
+		irq_set_handler_data(irq_eint, &eint0_15_data[irq]);
+		irq_set_chained_handler(irq_eint, exynos_irq_eint0_15);
 	}
 
 	return 0;
-- 
1.7.5.4