提交 52fa2120 编写于 作者: B Benoit Cousson

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: NBenoit Cousson <b-cousson@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: NRob Herring <rob.herring@calxeda.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
上级 1f52299e
* 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>;
};
......@@ -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
......
......@@ -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 @@ static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs
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)];
......
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