178 lines
4.1 KiB
C
178 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/mach-footbridge/irq.c
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*
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* Copyright (C) 1996-2000 Russell King
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*
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* Changelog:
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* 22-Aug-1998 RMK Restructured IRQ routines
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* 03-Sep-1998 PJB Merged CATS support
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* 20-Jan-1998 RMK Started merge of EBSA286, CATS and NetWinder
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* 26-Jan-1999 PJB Don't use IACK on CATS
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* 16-Mar-1999 RMK Added autodetect of ISA PICs
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*/
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <asm/mach/irq.h>
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#include <mach/hardware.h>
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#include <asm/hardware/dec21285.h>
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#include <asm/irq.h>
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#include <asm/mach-types.h>
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#include "common.h"
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static void isa_mask_pic_lo_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO);
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}
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static void isa_ack_pic_lo_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO);
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outb(0x20, PIC_LO);
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}
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static void isa_unmask_pic_lo_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO);
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}
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static struct irq_chip isa_lo_chip = {
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.irq_ack = isa_ack_pic_lo_irq,
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.irq_mask = isa_mask_pic_lo_irq,
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.irq_unmask = isa_unmask_pic_lo_irq,
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};
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static void isa_mask_pic_hi_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI);
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}
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static void isa_ack_pic_hi_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI);
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outb(0x62, PIC_LO);
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outb(0x20, PIC_HI);
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}
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static void isa_unmask_pic_hi_irq(struct irq_data *d)
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{
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unsigned int mask = 1 << (d->irq & 7);
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outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI);
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}
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static struct irq_chip isa_hi_chip = {
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.irq_ack = isa_ack_pic_hi_irq,
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.irq_mask = isa_mask_pic_hi_irq,
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.irq_unmask = isa_unmask_pic_hi_irq,
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};
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static void isa_irq_handler(struct irq_desc *desc)
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{
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unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE;
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if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) {
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do_bad_IRQ(desc);
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return;
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}
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generic_handle_irq(isa_irq);
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}
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static struct resource pic1_resource = {
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.name = "pic1",
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.start = 0x20,
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.end = 0x3f,
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};
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static struct resource pic2_resource = {
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.name = "pic2",
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.start = 0xa0,
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.end = 0xbf,
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};
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void __init isa_init_irq(unsigned int host_irq)
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{
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unsigned int irq;
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/*
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* Setup, and then probe for an ISA PIC
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* If the PIC is not there, then we
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* ignore the PIC.
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*/
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outb(0x11, PIC_LO);
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outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */
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outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */
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outb(0x01, PIC_MASK_LO); /* x86 */
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outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */
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outb(0x11, PIC_HI);
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outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */
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outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */
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outb(0x01, PIC_MASK_HI); /* x86 */
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outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */
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outb(0x0b, PIC_LO);
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outb(0x0b, PIC_HI);
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if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) {
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outb(0xff, PIC_MASK_LO);/* mask all IRQs */
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outb(0xff, PIC_MASK_HI);/* mask all IRQs */
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} else {
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printk(KERN_INFO "IRQ: ISA PIC not found\n");
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host_irq = (unsigned int)-1;
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}
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if (host_irq != (unsigned int)-1) {
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for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) {
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irq_set_chip_and_handler(irq, &isa_lo_chip,
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handle_level_irq);
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irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
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}
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for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) {
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irq_set_chip_and_handler(irq, &isa_hi_chip,
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handle_level_irq);
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irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
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}
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request_resource(&ioport_resource, &pic1_resource);
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request_resource(&ioport_resource, &pic2_resource);
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irq = IRQ_ISA_CASCADE;
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if (request_irq(irq, no_action, 0, "cascade", NULL))
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pr_err("Failed to request irq %u (cascade)\n", irq);
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irq_set_chained_handler(host_irq, isa_irq_handler);
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/*
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* On the NetWinder, don't automatically
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* enable ISA IRQ11 when it is requested.
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* There appears to be a missing pull-up
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* resistor on this line.
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*/
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if (machine_is_netwinder())
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irq_modify_status(_ISA_IRQ(11),
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IRQ_NOREQUEST | IRQ_NOPROBE, IRQ_NOAUTOEN);
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}
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}
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