1/* 2 * arch/arm/mach-kirkwood/irq.c 3 * 4 * Kirkwood IRQ handling. 5 * 6 * This file is licensed under the terms of the GNU General Public 7 * License version 2. This program is licensed "as is" without any 8 * warranty of any kind, whether express or implied. 9 */ 10 11#include <linux/kernel.h> 12#include <linux/init.h> 13#include <linux/irq.h> 14#include <linux/io.h> 15#include <mach/bridge-regs.h> 16#include <plat/irq.h> 17#include <asm/gpio.h> 18#include "common.h" 19 20static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) 21{ 22 BUG_ON(irq < IRQ_KIRKWOOD_GPIO_LOW_0_7); 23 BUG_ON(irq > IRQ_KIRKWOOD_GPIO_HIGH_16_23); 24 25 orion_gpio_irq_handler((irq - IRQ_KIRKWOOD_GPIO_LOW_0_7) << 3); 26} 27 28void __init kirkwood_init_irq(void) 29{ 30 int i; 31 32 orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF)); 33 orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF)); 34 35 /* 36 * Mask and clear GPIO IRQ interrupts. 37 */ 38 writel(0, GPIO_LEVEL_MASK(0)); 39 writel(0, GPIO_EDGE_MASK(0)); 40 writel(0, GPIO_EDGE_CAUSE(0)); 41 writel(0, GPIO_LEVEL_MASK(32)); 42 writel(0, GPIO_EDGE_MASK(32)); 43 writel(0, GPIO_EDGE_CAUSE(32)); 44 45 for (i = IRQ_KIRKWOOD_GPIO_START; i < NR_IRQS; i++) { 46 set_irq_chip(i, &orion_gpio_irq_chip); 47 set_irq_handler(i, handle_level_irq); 48 irq_desc[i].status |= IRQ_LEVEL; 49 set_irq_flags(i, IRQF_VALID); 50 } 51 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_0_7, gpio_irq_handler); 52 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_8_15, gpio_irq_handler); 53 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_16_23, gpio_irq_handler); 54 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_24_31, gpio_irq_handler); 55 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_0_7, gpio_irq_handler); 56 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_8_15, gpio_irq_handler); 57 set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23, gpio_irq_handler); 58} 59