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 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 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(0, 32, GPIO_VIRT_BASE, 0, 50 IRQ_ORION5X_GPIO_START, gpio0_irqs); 51 } 52