1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * IRQ vector handles 3*1da177e4SLinus Torvalds * 4*1da177e4SLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public 5*1da177e4SLinus Torvalds * License. See the file "COPYING" in the main directory of this archive 6*1da177e4SLinus Torvalds * for more details. 7*1da177e4SLinus Torvalds * 8*1da177e4SLinus Torvalds * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle 9*1da177e4SLinus Torvalds */ 10*1da177e4SLinus Torvalds #include <linux/kernel.h> 11*1da177e4SLinus Torvalds #include <linux/init.h> 12*1da177e4SLinus Torvalds #include <linux/irq.h> 13*1da177e4SLinus Torvalds 14*1da177e4SLinus Torvalds #include <asm/i8259.h> 15*1da177e4SLinus Torvalds #include <asm/irq_cpu.h> 16*1da177e4SLinus Torvalds #include <asm/gt64120.h> 17*1da177e4SLinus Torvalds #include <asm/ptrace.h> 18*1da177e4SLinus Torvalds 19*1da177e4SLinus Torvalds #include <asm/cobalt/cobalt.h> 20*1da177e4SLinus Torvalds 21*1da177e4SLinus Torvalds extern void cobalt_handle_int(void); 22*1da177e4SLinus Torvalds 23*1da177e4SLinus Torvalds /* 24*1da177e4SLinus Torvalds * We have two types of interrupts that we handle, ones that come in through 25*1da177e4SLinus Torvalds * the CPU interrupt lines, and ones that come in on the via chip. The CPU 26*1da177e4SLinus Torvalds * mappings are: 27*1da177e4SLinus Torvalds * 28*1da177e4SLinus Torvalds * 16, - Software interrupt 0 (unused) IE_SW0 29*1da177e4SLinus Torvalds * 17 - Software interrupt 1 (unused) IE_SW0 30*1da177e4SLinus Torvalds * 18 - Galileo chip (timer) IE_IRQ0 31*1da177e4SLinus Torvalds * 19 - Tulip 0 + NCR SCSI IE_IRQ1 32*1da177e4SLinus Torvalds * 20 - Tulip 1 IE_IRQ2 33*1da177e4SLinus Torvalds * 21 - 16550 UART IE_IRQ3 34*1da177e4SLinus Torvalds * 22 - VIA southbridge PIC IE_IRQ4 35*1da177e4SLinus Torvalds * 23 - unused IE_IRQ5 36*1da177e4SLinus Torvalds * 37*1da177e4SLinus Torvalds * The VIA chip is a master/slave 8259 setup and has the following interrupts: 38*1da177e4SLinus Torvalds * 39*1da177e4SLinus Torvalds * 8 - RTC 40*1da177e4SLinus Torvalds * 9 - PCI 41*1da177e4SLinus Torvalds * 14 - IDE0 42*1da177e4SLinus Torvalds * 15 - IDE1 43*1da177e4SLinus Torvalds */ 44*1da177e4SLinus Torvalds 45*1da177e4SLinus Torvalds asmlinkage void cobalt_irq(struct pt_regs *regs) 46*1da177e4SLinus Torvalds { 47*1da177e4SLinus Torvalds unsigned int pending = read_c0_status() & read_c0_cause(); 48*1da177e4SLinus Torvalds 49*1da177e4SLinus Torvalds if (pending & CAUSEF_IP2) { /* int 18 */ 50*1da177e4SLinus Torvalds unsigned long irq_src = GALILEO_INL(GT_INTRCAUSE_OFS); 51*1da177e4SLinus Torvalds 52*1da177e4SLinus Torvalds /* Check for timer irq ... */ 53*1da177e4SLinus Torvalds if (irq_src & GALILEO_T0EXP) { 54*1da177e4SLinus Torvalds /* Clear the int line */ 55*1da177e4SLinus Torvalds GALILEO_OUTL(0, GT_INTRCAUSE_OFS); 56*1da177e4SLinus Torvalds do_IRQ(COBALT_TIMER_IRQ, regs); 57*1da177e4SLinus Torvalds } 58*1da177e4SLinus Torvalds return; 59*1da177e4SLinus Torvalds } 60*1da177e4SLinus Torvalds 61*1da177e4SLinus Torvalds if (pending & CAUSEF_IP6) { /* int 22 */ 62*1da177e4SLinus Torvalds int irq = i8259_irq(); 63*1da177e4SLinus Torvalds 64*1da177e4SLinus Torvalds if (irq >= 0) 65*1da177e4SLinus Torvalds do_IRQ(irq, regs); 66*1da177e4SLinus Torvalds return; 67*1da177e4SLinus Torvalds } 68*1da177e4SLinus Torvalds 69*1da177e4SLinus Torvalds if (pending & CAUSEF_IP3) { /* int 19 */ 70*1da177e4SLinus Torvalds do_IRQ(COBALT_ETH0_IRQ, regs); 71*1da177e4SLinus Torvalds return; 72*1da177e4SLinus Torvalds } 73*1da177e4SLinus Torvalds 74*1da177e4SLinus Torvalds if (pending & CAUSEF_IP4) { /* int 20 */ 75*1da177e4SLinus Torvalds do_IRQ(COBALT_ETH1_IRQ, regs); 76*1da177e4SLinus Torvalds return; 77*1da177e4SLinus Torvalds } 78*1da177e4SLinus Torvalds 79*1da177e4SLinus Torvalds if (pending & CAUSEF_IP5) { /* int 21 */ 80*1da177e4SLinus Torvalds do_IRQ(COBALT_SERIAL_IRQ, regs); 81*1da177e4SLinus Torvalds return; 82*1da177e4SLinus Torvalds } 83*1da177e4SLinus Torvalds 84*1da177e4SLinus Torvalds if (pending & CAUSEF_IP7) { /* int 23 */ 85*1da177e4SLinus Torvalds do_IRQ(COBALT_QUBE_SLOT_IRQ, regs); 86*1da177e4SLinus Torvalds return; 87*1da177e4SLinus Torvalds } 88*1da177e4SLinus Torvalds } 89*1da177e4SLinus Torvalds 90*1da177e4SLinus Torvalds void __init arch_init_irq(void) 91*1da177e4SLinus Torvalds { 92*1da177e4SLinus Torvalds set_except_vector(0, cobalt_handle_int); 93*1da177e4SLinus Torvalds 94*1da177e4SLinus Torvalds init_i8259_irqs(); /* 0 ... 15 */ 95*1da177e4SLinus Torvalds mips_cpu_irq_init(16); /* 16 ... 23 */ 96*1da177e4SLinus Torvalds 97*1da177e4SLinus Torvalds /* 98*1da177e4SLinus Torvalds * Mask all cpu interrupts 99*1da177e4SLinus Torvalds * (except IE4, we already masked those at VIA level) 100*1da177e4SLinus Torvalds */ 101*1da177e4SLinus Torvalds change_c0_status(ST0_IM, IE_IRQ4); 102*1da177e4SLinus Torvalds } 103