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 <mach/bridge-regs.h>
17#include <plat/orion-gpio.h>
18#include <plat/irq.h>
19#include <asm/exception.h>
20#include "common.h"
21
22static 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#ifdef CONFIG_MULTI_IRQ_HANDLER
30/*
31 * Compiling with both non-DT and DT support enabled, will
32 * break asm irq handler used by non-DT boards. Therefore,
33 * we provide a C-style irq handler even for non-DT boards,
34 * if MULTI_IRQ_HANDLER is set.
35 */
36
37asmlinkage void
38__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
39{
40	u32 stat;
41
42	stat = readl_relaxed(MAIN_IRQ_CAUSE);
43	stat &= readl_relaxed(MAIN_IRQ_MASK);
44	if (stat) {
45		unsigned int hwirq = 1 + __fls(stat);
46		handle_IRQ(hwirq, regs);
47		return;
48	}
49}
50#endif
51
52void __init orion5x_init_irq(void)
53{
54	orion_irq_init(1, MAIN_IRQ_MASK);
55
56#ifdef CONFIG_MULTI_IRQ_HANDLER
57	set_handle_irq(orion5x_legacy_handle_irq);
58#endif
59
60	/*
61	 * Initialize gpiolib for GPIOs 0-31.
62	 */
63	orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
64			IRQ_ORION5X_GPIO_START, gpio0_irqs);
65}
66