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 #include <linux/gpio.h>
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 "common.h"
18
gpio_irq_handler(unsigned int irq,struct irq_desc * desc)19 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
20 {
21 BUG_ON(irq < IRQ_KIRKWOOD_GPIO_LOW_0_7);
22 BUG_ON(irq > IRQ_KIRKWOOD_GPIO_HIGH_16_23);
23
24 orion_gpio_irq_handler((irq - IRQ_KIRKWOOD_GPIO_LOW_0_7) << 3);
25 }
26
kirkwood_init_irq(void)27 void __init kirkwood_init_irq(void)
28 {
29 orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
30 orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
31
32 /*
33 * Initialize gpiolib for GPIOs 0-49.
34 */
35 orion_gpio_init(0, 32, GPIO_LOW_VIRT_BASE, 0,
36 IRQ_KIRKWOOD_GPIO_START);
37 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_0_7, gpio_irq_handler);
38 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_8_15, gpio_irq_handler);
39 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_16_23, gpio_irq_handler);
40 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_24_31, gpio_irq_handler);
41
42 orion_gpio_init(32, 18, GPIO_HIGH_VIRT_BASE, 0,
43 IRQ_KIRKWOOD_GPIO_START + 32);
44 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_0_7, gpio_irq_handler);
45 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_8_15, gpio_irq_handler);
46 irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23,
47 gpio_irq_handler);
48 }
49