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/*
* arch/arm/mach-kirkwood/irq.c
*
* Kirkwood IRQ handling.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <asm/exception.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/bridge-regs.h>
#include <plat/orion-gpio.h>
#include <plat/irq.h>
#include "common.h"
static int __initdata gpio0_irqs[4] = {
IRQ_KIRKWOOD_GPIO_LOW_0_7,
IRQ_KIRKWOOD_GPIO_LOW_8_15,
IRQ_KIRKWOOD_GPIO_LOW_16_23,
IRQ_KIRKWOOD_GPIO_LOW_24_31,
};
static int __initdata gpio1_irqs[4] = {
IRQ_KIRKWOOD_GPIO_HIGH_0_7,
IRQ_KIRKWOOD_GPIO_HIGH_8_15,
IRQ_KIRKWOOD_GPIO_HIGH_16_23,
0,
};
#ifdef CONFIG_MULTI_IRQ_HANDLER
/*
* Compiling with both non-DT and DT support enabled, will
* break asm irq handler used by non-DT boards. Therefore,
* we provide a C-style irq handler even for non-DT boards,
* if MULTI_IRQ_HANDLER is set.
*/
static void __iomem *kirkwood_irq_base = IRQ_VIRT_BASE;
asmlinkage void
__exception_irq_entry kirkwood_legacy_handle_irq(struct pt_regs *regs)
{
u32 stat;
stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_LOW_OFF);
stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_LOW_OFF);
if (stat) {
unsigned int hwirq = __fls(stat);
handle_IRQ(hwirq, regs);
return;
}
stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_HIGH_OFF);
stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_HIGH_OFF);
if (stat) {
unsigned int hwirq = 32 + __fls(stat);
handle_IRQ(hwirq, regs);
return;
}
}
#endif
void __init kirkwood_init_irq(void)
{
orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
orion_irq_init(32, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
#ifdef CONFIG_MULTI_IRQ_HANDLER
set_handle_irq(kirkwood_legacy_handle_irq);
#endif
/*
* Initialize gpiolib for GPIOs 0-49.
*/
orion_gpio_init(NULL, 0, 32, GPIO_LOW_VIRT_BASE, 0,
IRQ_KIRKWOOD_GPIO_START, gpio0_irqs);
orion_gpio_init(NULL, 32, 18, GPIO_HIGH_VIRT_BASE, 0,
IRQ_KIRKWOOD_GPIO_START + 32, gpio1_irqs);
}
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