irqchip: exynos-combiner: Correct combined IRQs for exynos4

This patch corrects combined IRQs for exynos4 series platform. The exynos4412
has four extra combined irq group and the exynos4212 has two more combined
irqs
than exynos4210. Each irq is mapped to IRQ_SPI(xx). Unfortunately, extra 4
combined IRQs isn't sequential. So, we need to map the irqs manually.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[kgene.kim@samsung.com: changes moved into drivers/irqchip/]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos/include/mach/irqs.h

@@ -166,7 +166,10 @@
 #define EXYNOS4_IRQ_FIMD0_VSYNC		COMBINER_IRQ(11, 1)
 #define EXYNOS4_IRQ_FIMD0_SYSTEM	COMBINER_IRQ(11, 2)
 
-#define EXYNOS4_MAX_COMBINER_NR		16
+#define EXYNOS4210_MAX_COMBINER_NR	16
+#define EXYNOS4212_MAX_COMBINER_NR	18
+#define EXYNOS4412_MAX_COMBINER_NR	20
+#define EXYNOS4_MAX_COMBINER_NR		EXYNOS4412_MAX_COMBINER_NR
 
 #define EXYNOS4_IRQ_GPIO1_NR_GROUPS	16
 #define EXYNOS4_IRQ_GPIO2_NR_GROUPS	9

drivers/irqchip/exynos-combiner.c

@@ -112,16 +112,22 @@ static struct irq_chip combiner_chip = {
 #endif
 };
 
-static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
+static unsigned int max_combiner_nr(void)
 {
-	unsigned int max_nr;
-
 	if (soc_is_exynos5250())
-		max_nr = EXYNOS5_MAX_COMBINER_NR;
+		return EXYNOS5_MAX_COMBINER_NR;
+	else if (soc_is_exynos4412())
+		return EXYNOS4412_MAX_COMBINER_NR;
+	else if (soc_is_exynos4212())
+		return EXYNOS4212_MAX_COMBINER_NR;
 	else
-		max_nr = EXYNOS4_MAX_COMBINER_NR;
+		return EXYNOS4210_MAX_COMBINER_NR;
+}
 
-	if (combiner_nr >= max_nr)
+static void __init combiner_cascade_irq(unsigned int combiner_nr,
+					unsigned int irq)
+{
+	if (combiner_nr >= max_combiner_nr())
 		BUG();
 	if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
 		BUG();
@@ -186,23 +192,38 @@ static struct irq_domain_ops combiner_irq_domain_ops = {
 	.map	= combiner_irq_domain_map,
 };
 
+static unsigned int exynos4x12_combiner_extra_irq(int group)
+{
+	switch (group) {
+	case 16:
+		return IRQ_SPI(107);
+	case 17:
+		return IRQ_SPI(108);
+	case 18:
+		return IRQ_SPI(48);
+	case 19:
+		return IRQ_SPI(42);
+	default:
+		return 0;
+	}
+}
+
 void __init combiner_init(void __iomem *combiner_base,
 			  struct device_node *np)
 {
 	int i, irq, irq_base;
 	unsigned int max_nr, nr_irq;
 
+	max_nr = max_combiner_nr();
+
 	if (np) {
 		if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
-			pr_warning("%s: number of combiners not specified, "
+			pr_info("%s: number of combiners not specified, "
 				"setting default as %d.\n",
-				__func__, EXYNOS4_MAX_COMBINER_NR);
-			max_nr = EXYNOS4_MAX_COMBINER_NR;
+				__func__, max_nr);
 		}
-	} else {
-		max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR :
-						EXYNOS4_MAX_COMBINER_NR;
 	}
+
 	nr_irq = max_nr * MAX_IRQ_IN_COMBINER;
 
 	irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
@@ -219,7 +240,10 @@ void __init combiner_init(void __iomem *combiner_base,
 	}
 
 	for (i = 0; i < max_nr; i++) {
-		irq = IRQ_SPI(i);
+		if (i < EXYNOS4210_MAX_COMBINER_NR || soc_is_exynos5250())
+			irq = IRQ_SPI(i);
+		else
+			irq = exynos4x12_combiner_extra_irq(i);
 #ifdef CONFIG_OF
 		if (np)
 			irq = irq_of_parse_and_map(np, i);