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/*
* arch/mips/emma2rh/markeins/irq.c
* This file defines the irq handler for EMMA2RH.
*
* Copyright (C) NEC Electronics Corporation 2004-2006
*
* This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
*
* Copyright 2001 MontaVista Software Inc.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/delay.h>
#include <asm/irq_cpu.h>
#include <asm/system.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/emma/emma2rh.h>
static void emma2rh_irq_enable(unsigned int irq)
{
u32 reg_value;
u32 reg_bitmask;
u32 reg_index;
irq -= EMMA2RH_IRQ_BASE;
reg_index = EMMA2RH_BHIF_INT_EN_0 +
(EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
reg_value = emma2rh_in32(reg_index);
reg_bitmask = 0x1 << (irq % 32);
emma2rh_out32(reg_index, reg_value | reg_bitmask);
}
static void emma2rh_irq_disable(unsigned int irq)
{
u32 reg_value;
u32 reg_bitmask;
u32 reg_index;
irq -= EMMA2RH_IRQ_BASE;
reg_index = EMMA2RH_BHIF_INT_EN_0 +
(EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
reg_value = emma2rh_in32(reg_index);
reg_bitmask = 0x1 << (irq % 32);
emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
}
struct irq_chip emma2rh_irq_controller = {
.name = "emma2rh_irq",
.ack = emma2rh_irq_disable,
.mask = emma2rh_irq_disable,
.mask_ack = emma2rh_irq_disable,
.unmask = emma2rh_irq_enable,
};
void emma2rh_irq_init(void)
{
u32 i;
for (i = 0; i < NUM_EMMA2RH_IRQ; i++)
set_irq_chip_and_handler(EMMA2RH_IRQ_BASE + i,
&emma2rh_irq_controller,
handle_level_irq);
}
static void emma2rh_sw_irq_enable(unsigned int irq)
{
u32 reg;
irq -= EMMA2RH_SW_IRQ_BASE;
reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
reg |= 1 << irq;
emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
}
static void emma2rh_sw_irq_disable(unsigned int irq)
{
u32 reg;
irq -= EMMA2RH_SW_IRQ_BASE;
reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
reg &= ~(1 << irq);
emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
}
struct irq_chip emma2rh_sw_irq_controller = {
.name = "emma2rh_sw_irq",
.ack = emma2rh_sw_irq_disable,
.mask = emma2rh_sw_irq_disable,
.mask_ack = emma2rh_sw_irq_disable,
.unmask = emma2rh_sw_irq_enable,
};
void emma2rh_sw_irq_init(void)
{
u32 i;
for (i = 0; i < NUM_EMMA2RH_IRQ_SW; i++)
set_irq_chip_and_handler(EMMA2RH_SW_IRQ_BASE + i,
&emma2rh_sw_irq_controller,
handle_level_irq);
}
static void emma2rh_gpio_irq_enable(unsigned int irq)
{
u32 reg;
irq -= EMMA2RH_GPIO_IRQ_BASE;
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
reg |= 1 << irq;
emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
}
static void emma2rh_gpio_irq_disable(unsigned int irq)
{
u32 reg;
irq -= EMMA2RH_GPIO_IRQ_BASE;
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
reg &= ~(1 << irq);
emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
}
static void emma2rh_gpio_irq_ack(unsigned int irq)
{
u32 reg;
irq -= EMMA2RH_GPIO_IRQ_BASE;
emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
reg &= ~(1 << irq);
emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
}
static void emma2rh_gpio_irq_end(unsigned int irq)
{
u32 reg;
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
irq -= EMMA2RH_GPIO_IRQ_BASE;
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
reg |= 1 << irq;
emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
}
}
struct irq_chip emma2rh_gpio_irq_controller = {
.name = "emma2rh_gpio_irq",
.ack = emma2rh_gpio_irq_ack,
.mask = emma2rh_gpio_irq_disable,
.mask_ack = emma2rh_gpio_irq_ack,
.unmask = emma2rh_gpio_irq_enable,
.end = emma2rh_gpio_irq_end,
};
void emma2rh_gpio_irq_init(void)
{
u32 i;
for (i = 0; i < NUM_EMMA2RH_IRQ_GPIO; i++)
set_irq_chip(EMMA2RH_GPIO_IRQ_BASE + i,
&emma2rh_gpio_irq_controller);
}
static struct irqaction irq_cascade = {
.handler = no_action,
.flags = 0,
.mask = CPU_MASK_NONE,
.name = "cascade",
.dev_id = NULL,
.next = NULL,
};
/*
* the first level int-handler will jump here if it is a emma2rh irq
*/
void emma2rh_irq_dispatch(void)
{
u32 intStatus;
u32 bitmask;
u32 i;
intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_0) &
emma2rh_in32(EMMA2RH_BHIF_INT_EN_0);
#ifdef EMMA2RH_SW_CASCADE
if (intStatus & (1UL << EMMA2RH_SW_CASCADE)) {
u32 swIntStatus;
swIntStatus = emma2rh_in32(EMMA2RH_BHIF_SW_INT)
& emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
if (swIntStatus & bitmask) {
do_IRQ(EMMA2RH_SW_IRQ_BASE + i);
return;
}
}
}
/* Skip S/W interrupt */
intStatus &= ~(1UL << EMMA2RH_SW_CASCADE);
#endif
for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
if (intStatus & bitmask) {
do_IRQ(EMMA2RH_IRQ_BASE + i);
return;
}
}
intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_1) &
emma2rh_in32(EMMA2RH_BHIF_INT_EN_1);
#ifdef EMMA2RH_GPIO_CASCADE
if (intStatus & (1UL << (EMMA2RH_GPIO_CASCADE % 32))) {
u32 gpioIntStatus;
gpioIntStatus = emma2rh_in32(EMMA2RH_GPIO_INT_ST)
& emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
if (gpioIntStatus & bitmask) {
do_IRQ(EMMA2RH_GPIO_IRQ_BASE + i);
return;
}
}
}
/* Skip GPIO interrupt */
intStatus &= ~(1UL << (EMMA2RH_GPIO_CASCADE % 32));
#endif
for (i = 32, bitmask = 1; i < 64; i++, bitmask <<= 1) {
if (intStatus & bitmask) {
do_IRQ(EMMA2RH_IRQ_BASE + i);
return;
}
}
intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_2) &
emma2rh_in32(EMMA2RH_BHIF_INT_EN_2);
for (i = 64, bitmask = 1; i < 96; i++, bitmask <<= 1) {
if (intStatus & bitmask) {
do_IRQ(EMMA2RH_IRQ_BASE + i);
return;
}
}
}
void __init arch_init_irq(void)
{
u32 reg;
/* by default, interrupts are disabled. */
emma2rh_out32(EMMA2RH_BHIF_INT_EN_0, 0);
emma2rh_out32(EMMA2RH_BHIF_INT_EN_1, 0);
emma2rh_out32(EMMA2RH_BHIF_INT_EN_2, 0);
emma2rh_out32(EMMA2RH_BHIF_INT1_EN_0, 0);
emma2rh_out32(EMMA2RH_BHIF_INT1_EN_1, 0);
emma2rh_out32(EMMA2RH_BHIF_INT1_EN_2, 0);
emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, 0);
clear_c0_status(0xff00);
set_c0_status(0x0400);
#define GPIO_PCI (0xf<<15)
/* setup GPIO interrupt for PCI interface */
/* direction input */
reg = emma2rh_in32(EMMA2RH_GPIO_DIR);
emma2rh_out32(EMMA2RH_GPIO_DIR, reg & ~GPIO_PCI);
/* disable interrupt */
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg & ~GPIO_PCI);
/* level triggerd */
reg = emma2rh_in32(EMMA2RH_GPIO_INT_MODE);
emma2rh_out32(EMMA2RH_GPIO_INT_MODE, reg | GPIO_PCI);
reg = emma2rh_in32(EMMA2RH_GPIO_INT_CND_A);
emma2rh_out32(EMMA2RH_GPIO_INT_CND_A, reg & (~GPIO_PCI));
/* interrupt clear */
emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~GPIO_PCI);
/* init all controllers */
emma2rh_irq_init();
emma2rh_sw_irq_init();
emma2rh_gpio_irq_init();
mips_cpu_irq_init();
/* setup cascade interrupts */
setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_SW_CASCADE, &irq_cascade);
setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_GPIO_CASCADE, &irq_cascade);
setup_irq(CPU_IRQ_BASE + CPU_EMMA2RH_CASCADE, &irq_cascade);
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
if (pending & STATUSF_IP7)
do_IRQ(CPU_IRQ_BASE + 7);
else if (pending & STATUSF_IP2)
emma2rh_irq_dispatch();
else if (pending & STATUSF_IP1)
do_IRQ(CPU_IRQ_BASE + 1);
else if (pending & STATUSF_IP0)
do_IRQ(CPU_IRQ_BASE + 0);
else
spurious_interrupt();
}
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