1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
169 lines
4.2 KiB
C
169 lines
4.2 KiB
C
/*
|
|
* linux/arch/arm/mach-footbridge/irq.c
|
|
*
|
|
* Copyright (C) 1996-2000 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Changelog:
|
|
* 22-Aug-1998 RMK Restructured IRQ routines
|
|
* 03-Sep-1998 PJB Merged CATS support
|
|
* 20-Jan-1998 RMK Started merge of EBSA286, CATS and NetWinder
|
|
* 26-Jan-1999 PJB Don't use IACK on CATS
|
|
* 16-Mar-1999 RMK Added autodetect of ISA PICs
|
|
*/
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/list.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/mach/irq.h>
|
|
|
|
#include <asm/hardware.h>
|
|
#include <asm/hardware/dec21285.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
static void isa_mask_pic_lo_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO);
|
|
}
|
|
|
|
static void isa_ack_pic_lo_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO);
|
|
outb(0x20, PIC_LO);
|
|
}
|
|
|
|
static void isa_unmask_pic_lo_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO);
|
|
}
|
|
|
|
static struct irqchip isa_lo_chip = {
|
|
.ack = isa_ack_pic_lo_irq,
|
|
.mask = isa_mask_pic_lo_irq,
|
|
.unmask = isa_unmask_pic_lo_irq,
|
|
};
|
|
|
|
static void isa_mask_pic_hi_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI);
|
|
}
|
|
|
|
static void isa_ack_pic_hi_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI);
|
|
outb(0x62, PIC_LO);
|
|
outb(0x20, PIC_HI);
|
|
}
|
|
|
|
static void isa_unmask_pic_hi_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq & 7);
|
|
|
|
outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI);
|
|
}
|
|
|
|
static struct irqchip isa_hi_chip = {
|
|
.ack = isa_ack_pic_hi_irq,
|
|
.mask = isa_mask_pic_hi_irq,
|
|
.unmask = isa_unmask_pic_hi_irq,
|
|
};
|
|
|
|
static void
|
|
isa_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
|
|
{
|
|
unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE;
|
|
|
|
if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) {
|
|
do_bad_IRQ(isa_irq, desc, regs);
|
|
return;
|
|
}
|
|
|
|
desc = irq_desc + isa_irq;
|
|
desc->handle(isa_irq, desc, regs);
|
|
}
|
|
|
|
static struct irqaction irq_cascade = { .handler = no_action, .name = "cascade", };
|
|
static struct resource pic1_resource = { "pic1", 0x20, 0x3f };
|
|
static struct resource pic2_resource = { "pic2", 0xa0, 0xbf };
|
|
|
|
void __init isa_init_irq(unsigned int host_irq)
|
|
{
|
|
unsigned int irq;
|
|
|
|
/*
|
|
* Setup, and then probe for an ISA PIC
|
|
* If the PIC is not there, then we
|
|
* ignore the PIC.
|
|
*/
|
|
outb(0x11, PIC_LO);
|
|
outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */
|
|
outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */
|
|
outb(0x01, PIC_MASK_LO); /* x86 */
|
|
outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */
|
|
|
|
outb(0x11, PIC_HI);
|
|
outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */
|
|
outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */
|
|
outb(0x01, PIC_MASK_HI); /* x86 */
|
|
outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */
|
|
|
|
outb(0x0b, PIC_LO);
|
|
outb(0x0b, PIC_HI);
|
|
|
|
if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) {
|
|
outb(0xff, PIC_MASK_LO);/* mask all IRQs */
|
|
outb(0xff, PIC_MASK_HI);/* mask all IRQs */
|
|
} else {
|
|
printk(KERN_INFO "IRQ: ISA PIC not found\n");
|
|
host_irq = (unsigned int)-1;
|
|
}
|
|
|
|
if (host_irq != (unsigned int)-1) {
|
|
for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) {
|
|
set_irq_chip(irq, &isa_lo_chip);
|
|
set_irq_handler(irq, do_level_IRQ);
|
|
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
|
|
}
|
|
|
|
for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) {
|
|
set_irq_chip(irq, &isa_hi_chip);
|
|
set_irq_handler(irq, do_level_IRQ);
|
|
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
|
|
}
|
|
|
|
request_resource(&ioport_resource, &pic1_resource);
|
|
request_resource(&ioport_resource, &pic2_resource);
|
|
setup_irq(IRQ_ISA_CASCADE, &irq_cascade);
|
|
|
|
set_irq_chained_handler(host_irq, isa_irq_handler);
|
|
|
|
/*
|
|
* On the NetWinder, don't automatically
|
|
* enable ISA IRQ11 when it is requested.
|
|
* There appears to be a missing pull-up
|
|
* resistor on this line.
|
|
*/
|
|
if (machine_is_netwinder())
|
|
set_irq_flags(_ISA_IRQ(11), IRQF_VALID |
|
|
IRQF_PROBE | IRQF_NOAUTOEN);
|
|
}
|
|
}
|
|
|
|
|