1/* 2 * Copyright 2008 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 2 of the License, or (at your 7 * option) any later version. 8 */ 9 10#include <linux/stddef.h> 11#include <linux/kernel.h> 12#include <linux/interrupt.h> 13#include <linux/of_platform.h> 14 15#include <asm/system.h> 16#include <asm/mpic.h> 17#include <asm/i8259.h> 18 19#ifdef CONFIG_PPC_I8259 20static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc) 21{ 22 unsigned int cascade_irq = i8259_irq(); 23 if (cascade_irq != NO_IRQ) 24 generic_handle_irq(cascade_irq); 25 desc->chip->eoi(irq); 26} 27#endif /* CONFIG_PPC_I8259 */ 28 29void __init mpc86xx_init_irq(void) 30{ 31 struct mpic *mpic; 32 struct device_node *np; 33 struct resource res; 34#ifdef CONFIG_PPC_I8259 35 struct device_node *cascade_node = NULL; 36 int cascade_irq; 37#endif 38 39 /* Determine PIC address. */ 40 np = of_find_node_by_type(NULL, "open-pic"); 41 if (np == NULL) 42 return; 43 of_address_to_resource(np, 0, &res); 44 45 mpic = mpic_alloc(np, res.start, 46 MPIC_PRIMARY | MPIC_WANTS_RESET | 47 MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS | 48 MPIC_SINGLE_DEST_CPU, 49 0, 256, " MPIC "); 50 of_node_put(np); 51 BUG_ON(mpic == NULL); 52 53 mpic_init(mpic); 54 55#ifdef CONFIG_PPC_I8259 56 /* Initialize i8259 controller */ 57 for_each_node_by_type(np, "interrupt-controller") 58 if (of_device_is_compatible(np, "chrp,iic")) { 59 cascade_node = np; 60 break; 61 } 62 63 if (cascade_node == NULL) { 64 printk(KERN_DEBUG "Could not find i8259 PIC\n"); 65 return; 66 } 67 68 cascade_irq = irq_of_parse_and_map(cascade_node, 0); 69 if (cascade_irq == NO_IRQ) { 70 printk(KERN_ERR "Failed to map cascade interrupt\n"); 71 return; 72 } 73 74 i8259_init(cascade_node, 0); 75 of_node_put(cascade_node); 76 77 set_irq_chained_handler(cascade_irq, mpc86xx_8259_cascade); 78#endif 79} 80