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/*
* Copyright 2001 MontaVista Software Inc.
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* arch/mips/ddb5xxx/ddb5477/irq.c
* The irq setup and misc routines for DDB5476.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/system.h>
#include <asm/mipsregs.h>
#include <asm/debug.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/ddb5xxx/ddb5xxx.h>
/*
* IRQ mapping
*
* 0-7: 8 CPU interrupts
* 0 - software interrupt 0
* 1 - software interrupt 1
* 2 - most Vrc5477 interrupts are routed to this pin
* 3 - (optional) some other interrupts routed to this pin for debugg
* 4 - not used
* 5 - not used
* 6 - not used
* 7 - cpu timer (used by default)
*
* 8-39: 32 Vrc5477 interrupt sources
* (refer to the Vrc5477 manual)
*/
#define PCI0 DDB_INTPPES0
#define PCI1 DDB_INTPPES1
#define ACTIVE_LOW 1
#define ACTIVE_HIGH 0
#define LEVEL_SENSE 2
#define EDGE_TRIGGER 0
#define INTA 0
#define INTB 1
#define INTC 2
#define INTD 3
#define INTE 4
static inline void
set_pci_int_attr(u32 pci, u32 intn, u32 active, u32 trigger)
{
u32 reg_value;
u32 reg_bitmask;
reg_value = ddb_in32(pci);
reg_bitmask = 0x3 << (intn * 2);
reg_value &= ~reg_bitmask;
reg_value |= (active | trigger) << (intn * 2);
ddb_out32(pci, reg_value);
}
extern void vrc5477_irq_init(u32 base);
static struct irqaction irq_cascade = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL };
void __init arch_init_irq(void)
{
/* by default, we disable all interrupts and route all vrc5477
* interrupts to pin 0 (irq 2) */
ddb_out32(DDB_INTCTRL0, 0);
ddb_out32(DDB_INTCTRL1, 0);
ddb_out32(DDB_INTCTRL2, 0);
ddb_out32(DDB_INTCTRL3, 0);
clear_c0_status(0xff00);
set_c0_status(0x0400);
/* setup PCI interrupt attributes */
set_pci_int_attr(PCI0, INTA, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI0, INTB, ACTIVE_LOW, LEVEL_SENSE);
if (mips_machtype == MACH_NEC_ROCKHOPPERII)
set_pci_int_attr(PCI0, INTC, ACTIVE_HIGH, LEVEL_SENSE);
else
set_pci_int_attr(PCI0, INTC, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI0, INTD, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI0, INTE, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI1, INTA, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI1, INTB, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI1, INTC, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI1, INTD, ACTIVE_LOW, LEVEL_SENSE);
set_pci_int_attr(PCI1, INTE, ACTIVE_LOW, LEVEL_SENSE);
/*
* for debugging purpose, we enable several error interrupts
* and route them to pin 1. (IP3)
*/
/* cpu parity check - 0 */
ll_vrc5477_irq_route(0, 1); ll_vrc5477_irq_enable(0);
/* cpu no-target decode - 1 */
ll_vrc5477_irq_route(1, 1); ll_vrc5477_irq_enable(1);
/* local bus read time-out - 7 */
ll_vrc5477_irq_route(7, 1); ll_vrc5477_irq_enable(7);
/* PCI SERR# - 14 */
ll_vrc5477_irq_route(14, 1); ll_vrc5477_irq_enable(14);
/* PCI internal error - 15 */
ll_vrc5477_irq_route(15, 1); ll_vrc5477_irq_enable(15);
/* IOPCI SERR# - 30 */
ll_vrc5477_irq_route(30, 1); ll_vrc5477_irq_enable(30);
/* IOPCI internal error - 31 */
ll_vrc5477_irq_route(31, 1); ll_vrc5477_irq_enable(31);
/* init all controllers */
init_i8259_irqs();
mips_cpu_irq_init();
vrc5477_irq_init(VRC5477_IRQ_BASE);
/* setup cascade interrupts */
setup_irq(VRC5477_IRQ_BASE + VRC5477_I8259_CASCADE, &irq_cascade);
setup_irq(CPU_IRQ_BASE + CPU_VRC5477_CASCADE, &irq_cascade);
}
u8 i8259_interrupt_ack(void)
{
u8 irq;
u32 reg;
/* Set window 0 for interrupt acknowledge */
reg = ddb_in32(DDB_PCIINIT10);
ddb_set_pmr(DDB_PCIINIT10, DDB_PCICMD_IACK, 0, DDB_PCI_ACCESS_32);
irq = *(volatile u8 *) KSEG1ADDR(DDB_PCI_IACK_BASE);
ddb_out32(DDB_PCIINIT10, reg);
return irq;
}
/*
* the first level int-handler will jump here if it is a vrc5477 irq
*/
#define NUM_5477_IRQS 32
static void vrc5477_irq_dispatch(void)
{
u32 intStatus;
u32 bitmask;
u32 i;
db_assert(ddb_in32(DDB_INT2STAT) == 0);
db_assert(ddb_in32(DDB_INT3STAT) == 0);
db_assert(ddb_in32(DDB_INT4STAT) == 0);
db_assert(ddb_in32(DDB_NMISTAT) == 0);
if (ddb_in32(DDB_INT1STAT) != 0) {
#if defined(CONFIG_RUNTIME_DEBUG)
vrc5477_show_int_regs();
#endif
panic("error interrupt has happened.");
}
intStatus = ddb_in32(DDB_INT0STAT);
if (mips_machtype == MACH_NEC_ROCKHOPPERII) {
/* check for i8259 interrupts */
if (intStatus & (1 << VRC5477_I8259_CASCADE)) {
int i8259_irq = i8259_interrupt_ack();
do_IRQ(i8259_irq);
return;
}
}
for (i=0, bitmask=1; i<= NUM_5477_IRQS; bitmask <<=1, i++) {
/* do we need to "and" with the int mask? */
if (intStatus & bitmask) {
do_IRQ(VRC5477_IRQ_BASE + i);
return;
}
}
}
#define VR5477INTS (STATUSF_IP2|STATUSF_IP3|STATUSF_IP4|STATUSF_IP5|STATUSF_IP6)
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
if (pending & STATUSF_IP7)
do_IRQ(CPU_IRQ_BASE + 7);
else if (pending & VR5477INTS)
vrc5477_irq_dispatch();
else if (pending & STATUSF_IP0)
do_IRQ(CPU_IRQ_BASE);
else if (pending & STATUSF_IP1)
do_IRQ(CPU_IRQ_BASE + 1);
else
spurious_interrupt();
}
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