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 <plat/irq.h> 16 17 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr) 18 { 19 struct irq_chip_generic *gc; 20 struct irq_chip_type *ct; 21 22 /* 23 * Mask all interrupts initially. 24 */ 25 writel(0, maskaddr); 26 27 gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr, 28 handle_level_irq); 29 ct = gc->chip_types; 30 ct->chip.irq_mask = irq_gc_mask_clr_bit; 31 ct->chip.irq_unmask = irq_gc_mask_set_bit; 32 irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE, 33 IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE); 34 } 35