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 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 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