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/mpic.h> 16 #include <asm/i8259.h> 17 18 #ifdef CONFIG_PPC_I8259 19 static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc) 20 { 21 struct irq_chip *chip = irq_desc_get_chip(desc); 22 unsigned int cascade_irq = i8259_irq(); 23 24 if (cascade_irq != NO_IRQ) 25 generic_handle_irq(cascade_irq); 26 27 chip->irq_eoi(&desc->irq_data); 28 } 29 #endif /* CONFIG_PPC_I8259 */ 30 31 void __init mpc86xx_init_irq(void) 32 { 33 #ifdef CONFIG_PPC_I8259 34 struct device_node *np; 35 struct device_node *cascade_node = NULL; 36 int cascade_irq; 37 #endif 38 39 struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | 40 MPIC_SINGLE_DEST_CPU, 41 0, 256, " MPIC "); 42 BUG_ON(mpic == NULL); 43 44 mpic_init(mpic); 45 46 #ifdef CONFIG_PPC_I8259 47 /* Initialize i8259 controller */ 48 for_each_node_by_type(np, "interrupt-controller") 49 if (of_device_is_compatible(np, "chrp,iic")) { 50 cascade_node = np; 51 break; 52 } 53 54 if (cascade_node == NULL) { 55 printk(KERN_DEBUG "Could not find i8259 PIC\n"); 56 return; 57 } 58 59 cascade_irq = irq_of_parse_and_map(cascade_node, 0); 60 if (cascade_irq == NO_IRQ) { 61 printk(KERN_ERR "Failed to map cascade interrupt\n"); 62 return; 63 } 64 65 i8259_init(cascade_node, 0); 66 of_node_put(cascade_node); 67 68 irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade); 69 #endif 70 } 71