1 /* 2 * arch/arm/mach-dove/irq.c 3 * 4 * Dove IRQ handling. 5 * 6 * This file is licensed under the terms of the GNU General Public 7 * License version 2. This program is licensed "as is" without any 8 * warranty of any kind, whether express or implied. 9 */ 10 #include <linux/init.h> 11 #include <linux/irq.h> 12 #include <linux/io.h> 13 #include <asm/exception.h> 14 15 #include <plat/irq.h> 16 #include <plat/orion-gpio.h> 17 18 #include "pm.h" 19 #include "bridge-regs.h" 20 #include "common.h" 21 22 static int __initdata gpio0_irqs[4] = { 23 IRQ_DOVE_GPIO_0_7, 24 IRQ_DOVE_GPIO_8_15, 25 IRQ_DOVE_GPIO_16_23, 26 IRQ_DOVE_GPIO_24_31, 27 }; 28 29 static int __initdata gpio1_irqs[4] = { 30 IRQ_DOVE_HIGH_GPIO, 31 0, 32 0, 33 0, 34 }; 35 36 static int __initdata gpio2_irqs[4] = { 37 0, 38 0, 39 0, 40 0, 41 }; 42 43 static void __iomem *dove_irq_base = IRQ_VIRT_BASE; 44 45 static asmlinkage void 46 __exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs) 47 { 48 u32 stat; 49 50 stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF); 51 stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF); 52 if (stat) { 53 unsigned int hwirq = 1 + __fls(stat); 54 handle_IRQ(hwirq, regs); 55 return; 56 } 57 stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF); 58 stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF); 59 if (stat) { 60 unsigned int hwirq = 33 + __fls(stat); 61 handle_IRQ(hwirq, regs); 62 return; 63 } 64 } 65 66 void __init dove_init_irq(void) 67 { 68 orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF); 69 orion_irq_init(33, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF); 70 71 set_handle_irq(dove_legacy_handle_irq); 72 73 /* 74 * Initialize gpiolib for GPIOs 0-71. 75 */ 76 orion_gpio_init(NULL, 0, 32, DOVE_GPIO_LO_VIRT_BASE, 0, 77 IRQ_DOVE_GPIO_START, gpio0_irqs); 78 79 orion_gpio_init(NULL, 32, 32, DOVE_GPIO_HI_VIRT_BASE, 0, 80 IRQ_DOVE_GPIO_START + 32, gpio1_irqs); 81 82 orion_gpio_init(NULL, 64, 8, DOVE_GPIO2_VIRT_BASE, 0, 83 IRQ_DOVE_GPIO_START + 64, gpio2_irqs); 84 } 85