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/*
* 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/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.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>
/*
* Footbridge IRQ translation table
* Converts from our IRQ numbers into FootBridge masks
*/
static const int fb_irq_mask[] = {
IRQ_MASK_UART_RX, /* 0 */
IRQ_MASK_UART_TX, /* 1 */
IRQ_MASK_TIMER1, /* 2 */
IRQ_MASK_TIMER2, /* 3 */
IRQ_MASK_TIMER3, /* 4 */
IRQ_MASK_IN0, /* 5 */
IRQ_MASK_IN1, /* 6 */
IRQ_MASK_IN2, /* 7 */
IRQ_MASK_IN3, /* 8 */
IRQ_MASK_DOORBELLHOST, /* 9 */
IRQ_MASK_DMA1, /* 10 */
IRQ_MASK_DMA2, /* 11 */
IRQ_MASK_PCI, /* 12 */
IRQ_MASK_SDRAMPARITY, /* 13 */
IRQ_MASK_I2OINPOST, /* 14 */
IRQ_MASK_PCI_ABORT, /* 15 */
IRQ_MASK_PCI_SERR, /* 16 */
IRQ_MASK_DISCARD_TIMER, /* 17 */
IRQ_MASK_PCI_DPERR, /* 18 */
IRQ_MASK_PCI_PERR, /* 19 */
};
static void fb_mask_irq(unsigned int irq)
{
*CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
}
static void fb_unmask_irq(unsigned int irq)
{
*CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
}
static void __init __fb_init_irq(void)
{
int irq;
/*
* setup DC21285 IRQs
*/
*CSR_IRQ_DISABLE = -1;
*CSR_FIQ_DISABLE = -1;
for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
irq_desc[irq].valid = 1;
irq_desc[irq].probe_ok = 1;
irq_desc[irq].mask_ack = fb_mask_irq;
irq_desc[irq].mask = fb_mask_irq;
irq_desc[irq].unmask = fb_unmask_irq;
}
}
extern int isa_irq;
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_mask_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 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_mask_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 void no_action(int irq, void *dev_id, struct pt_regs *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 };
static void __init isa_init_irq(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 */
isa_irq = irq;
} else
isa_irq = -1;
if (isa_irq != -1) {
for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) {
irq_desc[irq].valid = 1;
irq_desc[irq].probe_ok = 1;
irq_desc[irq].mask_ack = isa_mask_ack_pic_lo_irq;
irq_desc[irq].mask = isa_mask_pic_lo_irq;
irq_desc[irq].unmask = isa_unmask_pic_lo_irq;
}
for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) {
irq_desc[irq].valid = 1;
irq_desc[irq].probe_ok = 1;
irq_desc[irq].mask_ack = isa_mask_ack_pic_hi_irq;
irq_desc[irq].mask = isa_mask_pic_hi_irq;
irq_desc[irq].unmask = isa_unmask_pic_hi_irq;
}
request_resource(&ioport_resource, &pic1_resource);
request_resource(&ioport_resource, &pic2_resource);
setup_arm_irq(IRQ_ISA_CASCADE, &irq_cascade);
setup_arm_irq(isa_irq, &irq_cascade);
/*
* 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())
irq_desc[_ISA_IRQ(11)].noautoenable = 1;
}
}
void __init footbridge_init_irq(void)
{
__fb_init_irq();
if (!footbridge_cfn_mode())
return;
if (machine_is_ebsa285())
/* The following is dependent on which slot
* you plug the Southbridge card into. We
* currently assume that you plug it into
* the right-hand most slot.
*/
isa_init_irq(IRQ_PCI);
if (machine_is_cats())
isa_init_irq(IRQ_IN2);
if (machine_is_netwinder())
isa_init_irq(IRQ_IN3);
}
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