ARM: 7395/1: VIC: use the domain mapping function to assign handlers

This removes the internal functions for assigning IRQ
handlers to each interrupt in favor of using the internal
map iterator in the irq domain code.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/common/vic.c

@@ -39,6 +39,7 @@
  * struct vic_device - VIC PM device
  * @irq: The IRQ number for the base of the VIC.
  * @base: The register base for the VIC.
+ * @valid_sources: A bitmask of valid interrupts
  * @resume_sources: A bitmask of interrupts for resume.
  * @resume_irqs: The IRQs enabled for resume.
  * @int_select: Save for VIC_INT_SELECT.
@@ -50,6 +51,7 @@
 struct vic_device {
 	void __iomem	*base;
 	int		irq;
+	u32		valid_sources;
 	u32		resume_sources;
 	u32		resume_irqs;
 	u32		int_select;
@@ -164,6 +166,27 @@ static int __init vic_pm_init(void)
 late_initcall(vic_pm_init);
 #endif /* CONFIG_PM */
 
+static struct irq_chip vic_chip;
+
+static int vic_irqdomain_map(struct irq_domain *d, unsigned int irq,
+			     irq_hw_number_t hwirq)
+{
+	struct vic_device *v = d->host_data;
+
+	/* Skip invalid IRQs, only register handlers for the real ones */
+	if (!(v->valid_sources & (1 << hwirq)))
+		return -ENOTSUPP;
+	irq_set_chip_and_handler(irq, &vic_chip, handle_level_irq);
+	irq_set_chip_data(irq, v->base);
+	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	return 0;
+}
+
+static struct irq_domain_ops vic_irqdomain_ops = {
+	.map = vic_irqdomain_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+
 /**
  * vic_register() - Register a VIC.
  * @base: The base address of the VIC.
@@ -191,6 +214,7 @@ static void __init vic_register(void __iomem *base, unsigned int irq,
 
 	v = &vic_devices[vic_id];
 	v->base = base;
+	v->valid_sources = valid_sources;
 	v->resume_sources = resume_sources;
 	v->irq = irq;
 	vic_id++;
@@ -289,23 +313,6 @@ static void __init vic_clear_interrupts(void __iomem *base)
 	}
 }
 
-static void __init vic_set_irq_sources(void __iomem *base,
-				unsigned int irq_start, u32 vic_sources)
-{
-	unsigned int i;
-
-	for (i = 0; i < 32; i++) {
-		if (vic_sources & (1 << i)) {
-			unsigned int irq = irq_start + i;
-
-			irq_set_chip_and_handler(irq, &vic_chip,
-						 handle_level_irq);
-			irq_set_chip_data(irq, base);
-			set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-		}
-	}
-}
-
 /*
  * The PL190 cell from ARM has been modified by ST to handle 64 interrupts.
  * The original cell has 32 interrupts, while the modified one has 64,
@@ -340,7 +347,6 @@ static void __init vic_init_st(void __iomem *base, unsigned int irq_start,
 		writel(32, base + VIC_PL190_DEF_VECT_ADDR);
 	}
 
-	vic_set_irq_sources(base, irq_start, vic_sources);
 	vic_register(base, irq_start, vic_sources, 0, node);
 }
 
@@ -381,8 +387,6 @@ void __init __vic_init(void __iomem *base, unsigned int irq_start,
 
 	vic_init2(base);
 
-	vic_set_irq_sources(base, irq_start, vic_sources);
-
 	vic_register(base, irq_start, vic_sources, resume_sources, node);
 }