1 /* 2 * arch/arm/plat-orion/irq.c 3 * 4 * Marvell Orion SoC 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 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/irq.h> 14 #include <linux/io.h> 15 #include <asm/plat-orion/irq.h> 16 17 static void orion_irq_mask(u32 irq) 18 { 19 void __iomem *maskaddr = get_irq_chip_data(irq); 20 u32 mask; 21 22 mask = readl(maskaddr); 23 mask &= ~(1 << (irq & 31)); 24 writel(mask, maskaddr); 25 } 26 27 static void orion_irq_unmask(u32 irq) 28 { 29 void __iomem *maskaddr = get_irq_chip_data(irq); 30 u32 mask; 31 32 mask = readl(maskaddr); 33 mask |= 1 << (irq & 31); 34 writel(mask, maskaddr); 35 } 36 37 static struct irq_chip orion_irq_chip = { 38 .name = "orion_irq", 39 .ack = orion_irq_mask, 40 .mask = orion_irq_mask, 41 .unmask = orion_irq_unmask, 42 }; 43 44 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr) 45 { 46 unsigned int i; 47 48 /* 49 * Mask all interrupts initially. 50 */ 51 writel(0, maskaddr); 52 53 /* 54 * Register IRQ sources. 55 */ 56 for (i = 0; i < 32; i++) { 57 unsigned int irq = irq_start + i; 58 59 set_irq_chip(irq, &orion_irq_chip); 60 set_irq_chip_data(irq, maskaddr); 61 set_irq_handler(irq, handle_level_irq); 62 set_irq_flags(irq, IRQF_VALID); 63 } 64 } 65