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103 lines
2.3 KiB
103 lines
2.3 KiB
20 years ago
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/*
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* IRQ vector handles
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <asm/i8259.h>
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#include <asm/irq_cpu.h>
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#include <asm/gt64120.h>
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#include <asm/ptrace.h>
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#include <asm/cobalt/cobalt.h>
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extern void cobalt_handle_int(void);
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/*
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* We have two types of interrupts that we handle, ones that come in through
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* the CPU interrupt lines, and ones that come in on the via chip. The CPU
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* mappings are:
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*
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* 16, - Software interrupt 0 (unused) IE_SW0
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* 17 - Software interrupt 1 (unused) IE_SW0
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* 18 - Galileo chip (timer) IE_IRQ0
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* 19 - Tulip 0 + NCR SCSI IE_IRQ1
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* 20 - Tulip 1 IE_IRQ2
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* 21 - 16550 UART IE_IRQ3
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* 22 - VIA southbridge PIC IE_IRQ4
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* 23 - unused IE_IRQ5
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*
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* The VIA chip is a master/slave 8259 setup and has the following interrupts:
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*
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* 8 - RTC
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* 9 - PCI
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* 14 - IDE0
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* 15 - IDE1
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*/
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asmlinkage void cobalt_irq(struct pt_regs *regs)
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{
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unsigned int pending = read_c0_status() & read_c0_cause();
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if (pending & CAUSEF_IP2) { /* int 18 */
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unsigned long irq_src = GALILEO_INL(GT_INTRCAUSE_OFS);
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/* Check for timer irq ... */
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if (irq_src & GALILEO_T0EXP) {
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/* Clear the int line */
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GALILEO_OUTL(0, GT_INTRCAUSE_OFS);
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do_IRQ(COBALT_TIMER_IRQ, regs);
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}
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return;
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}
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if (pending & CAUSEF_IP6) { /* int 22 */
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int irq = i8259_irq();
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if (irq >= 0)
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do_IRQ(irq, regs);
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return;
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}
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if (pending & CAUSEF_IP3) { /* int 19 */
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do_IRQ(COBALT_ETH0_IRQ, regs);
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return;
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}
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if (pending & CAUSEF_IP4) { /* int 20 */
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do_IRQ(COBALT_ETH1_IRQ, regs);
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return;
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}
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if (pending & CAUSEF_IP5) { /* int 21 */
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do_IRQ(COBALT_SERIAL_IRQ, regs);
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return;
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}
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if (pending & CAUSEF_IP7) { /* int 23 */
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do_IRQ(COBALT_QUBE_SLOT_IRQ, regs);
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return;
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}
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}
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void __init arch_init_irq(void)
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{
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set_except_vector(0, cobalt_handle_int);
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init_i8259_irqs(); /* 0 ... 15 */
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mips_cpu_irq_init(16); /* 16 ... 23 */
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/*
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* Mask all cpu interrupts
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* (except IE4, we already masked those at VIA level)
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*/
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change_c0_status(ST0_IM, IE_IRQ4);
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}
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