irqchip: exynos: pass irq_base from platform

The platform code knows the IRQ base, while the irqchip driver
should really not. This is a littly hacky because we still
hardwire the IRQ base to 160 for the combiner in the DT case,
when we should really use -1. Removing that line will cause
a linear IRQ domain to be use, as we should.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>

arch/arm/mach-exynos/common.c

@@ -447,7 +447,8 @@ void __init exynos4_init_irq(void)
 #endif
 
 	if (!of_have_populated_dt())
-		combiner_init(S5P_VA_COMBINER_BASE, NULL, max_combiner_nr());
+		combiner_init(S5P_VA_COMBINER_BASE, NULL,
+			      max_combiner_nr(), COMBINER_IRQ(0, 0));
 
 	/*
 	 * The parameters of s5p_init_irq() are for VIC init.

arch/arm/mach-exynos/common.h

@@ -70,7 +70,7 @@ void exynos4212_register_clocks(void);
 
 struct device_node;
 void combiner_init(void __iomem *combiner_base, struct device_node *np,
-			unsigned int max_nr);
+			unsigned int max_nr, int irq_base);
 
 extern struct smp_operations exynos_smp_ops;
 

drivers/irqchip/exynos-combiner.c

@@ -206,27 +206,22 @@ static unsigned int combiner_lookup_irq(int group)
 
 void __init combiner_init(void __iomem *combiner_base,
 			  struct device_node *np,
-			  unsigned int max_nr)
+			  unsigned int max_nr,
+			  int irq_base)
 {
-	int i, irq, irq_base;
+	int i, irq;
 	unsigned int nr_irq;
 	struct combiner_chip_data *combiner_data;
 
 	nr_irq = max_nr * IRQ_IN_COMBINER;
 
-	irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
-	if (IS_ERR_VALUE(irq_base)) {
-		irq_base = COMBINER_IRQ(0, 0);
-		pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base);
-	}
-
 	combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
 	if (!combiner_data) {
 		pr_warning("%s: could not allocate combiner data\n", __func__);
 		return;
 	}
 
-	combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
+	combiner_irq_domain = irq_domain_add_simple(np, nr_irq, irq_base,
 				&combiner_irq_domain_ops, combiner_data);
 	if (WARN_ON(!combiner_irq_domain)) {
 		pr_warning("%s: irq domain init failed\n", __func__);
@@ -253,6 +248,7 @@ static int __init combiner_of_init(struct device_node *np,
 {
 	void __iomem *combiner_base;
 	unsigned int max_nr = 20;
+	int irq_base = -1;
 
 	combiner_base = of_iomap(np, 0);
 	if (!combiner_base) {
@@ -266,7 +262,14 @@ static int __init combiner_of_init(struct device_node *np,
 			__func__, max_nr);
 	}
 
-	combiner_init(combiner_base, np, max_nr);
+	/* 
+	 * FIXME: This is a hardwired COMBINER_IRQ(0,0). Once all devices
+	 * get their IRQ from DT, remove this in order to get dynamic
+	 * allocation.
+	 */
+	irq_base = 160;
+
+	combiner_init(combiner_base, np, max_nr, irq_base);
 
 	return 0;
 }