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
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 #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
37 asmlinkage void
orion5x_legacy_handle_irq(struct pt_regs * regs)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
orion5x_init_irq(void)52 void __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