1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm/mach-orion5x/irq.c
4 *
5 * Core IRQ functions for Marvell Orion System On Chip
6 *
7 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
8 */
9 #include <linux/gpio.h>
10 #include <linux/kernel.h>
11 #include <linux/irq.h>
12 #include <linux/io.h>
13 #include <plat/orion-gpio.h>
14 #include <plat/irq.h>
15 #include <asm/exception.h>
16 #include "bridge-regs.h"
17 #include "common.h"
18
19 static int __initdata gpio0_irqs[4] = {
20 IRQ_ORION5X_GPIO_0_7,
21 IRQ_ORION5X_GPIO_8_15,
22 IRQ_ORION5X_GPIO_16_23,
23 IRQ_ORION5X_GPIO_24_31,
24 };
25
26 static asmlinkage void
orion5x_legacy_handle_irq(struct pt_regs * regs)27 __exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
28 {
29 u32 stat;
30
31 stat = readl_relaxed(MAIN_IRQ_CAUSE);
32 stat &= readl_relaxed(MAIN_IRQ_MASK);
33 if (stat) {
34 unsigned int hwirq = 1 + __fls(stat);
35 handle_IRQ(hwirq, regs);
36 return;
37 }
38 }
39
orion5x_init_irq(void)40 void __init orion5x_init_irq(void)
41 {
42 orion_irq_init(1, MAIN_IRQ_MASK);
43
44 set_handle_irq(orion5x_legacy_handle_irq);
45
46 /*
47 * Initialize gpiolib for GPIOs 0-31.
48 */
49 orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
50 IRQ_ORION5X_GPIO_START, gpio0_irqs);
51 }
52