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 20 static 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 29 void __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 0, 256, " MPIC "); 49 of_node_put(np); 50 BUG_ON(mpic == NULL); 51 52 mpic_init(mpic); 53 54 #ifdef CONFIG_PPC_I8259 55 /* Initialize i8259 controller */ 56 for_each_node_by_type(np, "interrupt-controller") 57 if (of_device_is_compatible(np, "chrp,iic")) { 58 cascade_node = np; 59 break; 60 } 61 62 if (cascade_node == NULL) { 63 printk(KERN_DEBUG "Could not find i8259 PIC\n"); 64 return; 65 } 66 67 cascade_irq = irq_of_parse_and_map(cascade_node, 0); 68 if (cascade_irq == NO_IRQ) { 69 printk(KERN_ERR "Failed to map cascade interrupt\n"); 70 return; 71 } 72 73 i8259_init(cascade_node, 0); 74 of_node_put(cascade_node); 75 76 set_irq_chained_handler(cascade_irq, mpc86xx_8259_cascade); 77 #endif 78 } 79