1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1992 Linus Torvalds 7 * Copyright (C) 1994 - 2000 Ralf Baechle 8 * Copyright (C) 2006 Thomas Bogendoerfer 9 */ 10 #include <linux/delay.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/irq.h> 14 #include <linux/kernel.h> 15 16 #include <asm/i8259.h> 17 #include <asm/io.h> 18 #include <asm/sni.h> 19 #include <asm/irq.h> 20 #include <asm/irq_cpu.h> 21 22 void (*sni_hwint)(void); 23 24 asmlinkage void plat_irq_dispatch(void) 25 { 26 sni_hwint(); 27 } 28 29 /* ISA irq handler */ 30 static irqreturn_t sni_isa_irq_handler(int dummy, void *p) 31 { 32 int irq; 33 34 irq = i8259_irq(); 35 if (unlikely(irq < 0)) 36 return IRQ_NONE; 37 38 generic_handle_irq(irq); 39 return IRQ_HANDLED; 40 } 41 42 struct irqaction sni_isa_irq = { 43 .handler = sni_isa_irq_handler, 44 .name = "ISA", 45 .flags = IRQF_SHARED | IRQF_DISABLED 46 }; 47 48 /* 49 * On systems with i8259-style interrupt controllers we assume for 50 * driver compatibility reasons interrupts 0 - 15 to be the i8295 51 * interrupts even if the hardware uses a different interrupt numbering. 52 */ 53 void __init arch_init_irq(void) 54 { 55 init_i8259_irqs(); /* Integrated i8259 */ 56 switch (sni_brd_type) { 57 case SNI_BRD_10: 58 case SNI_BRD_10NEW: 59 case SNI_BRD_TOWER_OASIC: 60 case SNI_BRD_MINITOWER: 61 sni_a20r_irq_init(); 62 break; 63 64 case SNI_BRD_PCI_TOWER: 65 sni_pcit_irq_init(); 66 break; 67 68 case SNI_BRD_PCI_TOWER_CPLUS: 69 sni_pcit_cplus_irq_init(); 70 break; 71 72 case SNI_BRD_RM200: 73 sni_rm200_irq_init(); 74 break; 75 76 case SNI_BRD_PCI_MTOWER: 77 case SNI_BRD_PCI_DESKTOP: 78 case SNI_BRD_PCI_MTOWER_CPLUS: 79 sni_pcimt_irq_init(); 80 break; 81 } 82 } 83