ARM: OMAP2/3: intc: Add DT support for TI interrupt controller

Add a function to initialize the OMAP2/3 interrupt controller (INTC)
using a device tree node.

This version take advantage of the new irq_domain_add_legacy API.

Replace some printk() with the proper pr_ macro.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/Documentation/devicetree/bindings/arm/omap/intc.txt b/Documentation/devicetree/bindings/arm/omap/intc.txt
new file mode 100644 (file)
index 0000000..f2583e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/omap/intc.txt
@@ -0,0 +1,27 @@
+* OMAP Interrupt Controller
+
+OMAP2/3 are using a TI interrupt controller that can support several
+configurable number of interrupts.
+
+Main node required properties:
+
+- compatible : should be:
+       "ti,omap2-intc"
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The type shall be a <u32> and the value shall be 1.
+
+  The cell contains the interrupt number in the range [0-128].
+- ti,intc-size: Number of interrupts handled by the interrupt controller.
+- reg: physical base address and size of the intc registers map.
+
+Example:
+
+       intc: interrupt-controller@1 {
+               compatible = "ti,omap2-intc";
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               ti,intc-size = <96>;
+               reg = <0x48200000 0x1000>;
+       };
+

diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index febffde..dd8c990 100644 (file)
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -174,6 +174,18 @@ void omap3_intc_handle_irq(struct pt_regs *regs);
 extern void __iomem *omap4_get_l2cache_base(void);
 #endif
 
+struct device_node;
+#ifdef CONFIG_OF
+int __init omap_intc_of_init(struct device_node *node,
+                            struct device_node *parent);
+#else
+int __init omap_intc_of_init(struct device_node *node,
+                            struct device_node *parent)
+{
+       return 0;
+}
+#endif
+
 #ifdef CONFIG_SMP
 extern void __iomem *omap4_get_scu_base(void);
 #else

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index 1fef061..26eaf37 100644 (file)
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -11,12 +11,16 @@
  * for more details.
  */
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <mach/hardware.h>
 #include <asm/exception.h>
 #include <asm/mach/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
 
 
 /* selected INTC register offsets */
@@ -57,6 +61,8 @@ static struct omap_irq_bank {
        },
 };
 
+static struct irq_domain *domain;
+
 /* Structure to save interrupt controller context */
 struct omap3_intc_regs {
        u32 sysconfig;
@@ -147,17 +153,27 @@ omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
                                IRQ_NOREQUEST | IRQ_NOPROBE, 0);
 }
 
-static void __init omap_init_irq(u32 base, int nr_irqs)
+static void __init omap_init_irq(u32 base, int nr_irqs,
+                                struct device_node *node)
 {
        void __iomem *omap_irq_base;
        unsigned long nr_of_irqs = 0;
        unsigned int nr_banks = 0;
-       int i, j;
+       int i, j, irq_base;
 
        omap_irq_base = ioremap(base, SZ_4K);
        if (WARN_ON(!omap_irq_base))
                return;
 
+       irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
+       if (irq_base < 0) {
+               pr_warn("Couldn't allocate IRQ numbers\n");
+               irq_base = 0;
+       }
+
+       domain = irq_domain_add_legacy(node, nr_irqs, irq_base, 0,
+                                      &irq_domain_simple_ops, NULL);
+
        for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
                struct omap_irq_bank *bank = irq_banks + i;
 
@@ -166,36 +182,36 @@ static void __init omap_init_irq(u32 base, int nr_irqs)
                /* Static mapping, never released */
                bank->base_reg = ioremap(base, SZ_4K);
                if (!bank->base_reg) {
-                       printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
+                       pr_err("Could not ioremap irq bank%i\n", i);
                        continue;
                }
 
                omap_irq_bank_init_one(bank);
 
                for (j = 0; j < bank->nr_irqs; j += 32)
-                       omap_alloc_gc(bank->base_reg + j, j, 32);
+                       omap_alloc_gc(bank->base_reg + j, j + irq_base, 32);
 
                nr_of_irqs += bank->nr_irqs;
                nr_banks++;
        }
 
-       printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
-              nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
+       pr_info("Total of %ld interrupts on %d active controller%s\n",
+               nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
 }
 
 void __init omap2_init_irq(void)
 {
-       omap_init_irq(OMAP24XX_IC_BASE, 96);
+       omap_init_irq(OMAP24XX_IC_BASE, 96, NULL);
 }
 
 void __init omap3_init_irq(void)
 {
-       omap_init_irq(OMAP34XX_IC_BASE, 96);
+       omap_init_irq(OMAP34XX_IC_BASE, 96, NULL);
 }
 
 void __init ti81xx_init_irq(void)
 {
-       omap_init_irq(OMAP34XX_IC_BASE, 128);
+       omap_init_irq(OMAP34XX_IC_BASE, 128, NULL);
 }
 
 static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs)
@@ -225,8 +241,10 @@ out:
                irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET);
                irqnr &= ACTIVEIRQ_MASK;
 
-               if (irqnr)
+               if (irqnr) {
+                       irqnr = irq_find_mapping(domain, irqnr);
                        handle_IRQ(irqnr, regs);
+               }
        } while (irqnr);
 }
 
@@ -236,6 +254,28 @@ asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs
        omap_intc_handle_irq(base_addr, regs);
 }
 
+int __init omap_intc_of_init(struct device_node *node,
+                            struct device_node *parent)
+{
+       struct resource res;
+       u32 nr_irqs = 96;
+
+       if (WARN_ON(!node))
+               return -ENODEV;
+
+       if (of_address_to_resource(node, 0, &res)) {
+               WARN(1, "unable to get intc registers\n");
+               return -EINVAL;
+       }
+
+       if (of_property_read_u32(node, "ti,intc-size", &nr_irqs))
+               pr_warn("unable to get intc-size, default to %d\n", nr_irqs);
+
+       omap_init_irq(res.start, nr_irqs, of_node_get(node));
+
+       return 0;
+}
+
 #ifdef CONFIG_ARCH_OMAP3
 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];