1 /*
2 * arch/arm/mach-orion5x/irq.c
3 *
4 * Core IRQ functions for Marvell Orion System On Chip
5 *
6 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12 #include <linux/gpio.h>
13 #include <linux/kernel.h>
14 #include <linux/irq.h>
15 #include <linux/io.h>
16 #include <plat/orion-gpio.h>
17 #include <plat/irq.h>
18 #include <asm/exception.h>
19 #include "bridge-regs.h"
20 #include "common.h"
21
22 static int __initdata gpio0_irqs[4] = {
23 IRQ_ORION5X_GPIO_0_7,
24 IRQ_ORION5X_GPIO_8_15,
25 IRQ_ORION5X_GPIO_16_23,
26 IRQ_ORION5X_GPIO_24_31,
27 };
28
29 static asmlinkage void
orion5x_legacy_handle_irq(struct pt_regs * regs)30 __exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
31 {
32 u32 stat;
33
34 stat = readl_relaxed(MAIN_IRQ_CAUSE);
35 stat &= readl_relaxed(MAIN_IRQ_MASK);
36 if (stat) {
37 unsigned int hwirq = 1 + __fls(stat);
38 handle_IRQ(hwirq, regs);
39 return;
40 }
41 }
42
orion5x_init_irq(void)43 void __init orion5x_init_irq(void)
44 {
45 orion_irq_init(1, MAIN_IRQ_MASK);
46
47 set_handle_irq(orion5x_legacy_handle_irq);
48
49 /*
50 * Initialize gpiolib for GPIOs 0-31.
51 */
52 orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
53 IRQ_ORION5X_GPIO_START, gpio0_irqs);
54 }
55