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/*
* Ralink RT305x SoC specific interrupt handling
*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/mach-ralink/rt305x.h>
#include <asm/mach-ralink/rt305x_regs.h>
static void rt305x_intc_irq_dispatch(void)
{
u32 pending;
pending = rt305x_intc_rr(INTC_REG_STATUS0);
if (pending & RT305X_INTC_INT_TIMER0)
do_IRQ(RT305X_INTC_IRQ_TIMER0);
else if (pending & RT305X_INTC_INT_TIMER1)
do_IRQ(RT305X_INTC_IRQ_TIMER1);
else if (pending & RT305X_INTC_INT_UART0)
do_IRQ(RT305X_INTC_IRQ_UART0);
else if (pending & RT305X_INTC_INT_UART1)
do_IRQ(RT305X_INTC_IRQ_UART1);
/* TODO: handle PIO interrupts as well */
else
spurious_interrupt();
}
static void rt305x_intc_irq_unmask(unsigned int irq)
{
irq -= RT305X_INTC_IRQ_BASE;
rt305x_intc_wr((1 << irq), INTC_REG_ENABLE);
}
static void rt305x_intc_irq_mask(unsigned int irq)
{
irq -= RT305X_INTC_IRQ_BASE;
rt305x_intc_wr((1 << irq), INTC_REG_DISABLE);
}
struct irq_chip rt305x_intc_irq_chip = {
.name = "RT305X INTC",
.unmask = rt305x_intc_irq_unmask,
.mask = rt305x_intc_irq_mask,
.mask_ack = rt305x_intc_irq_mask,
};
static struct irqaction rt305x_intc_irqaction = {
.handler = no_action,
.name = "cascade [RT305X INTC]",
};
static void __init rt305x_intc_irq_init(void)
{
int i;
/* disable all interrupts */
rt305x_intc_wr(~0, INTC_REG_DISABLE);
/* route all INTC interrupts to MIPS HW0 interrupt */
rt305x_intc_wr(0, INTC_REG_TYPE);
for (i = RT305X_INTC_IRQ_BASE;
i < RT305X_INTC_IRQ_BASE + RT305X_INTC_IRQ_COUNT; i++) {
set_irq_chip_and_handler(i, &rt305x_intc_irq_chip,
handle_level_irq);
}
setup_irq(RT305X_CPU_IRQ_INTC, &rt305x_intc_irqaction);
/* enable interrupt masking */
rt305x_intc_wr(RT305X_INTC_INT_GLOBAL, INTC_REG_ENABLE);
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned long pending;
pending = read_c0_status() & read_c0_cause() & ST0_IM;
if (pending & STATUSF_IP7)
do_IRQ(RT305X_CPU_IRQ_COUNTER);
else if (pending & STATUSF_IP5)
do_IRQ(RT305X_CPU_IRQ_FE);
else if (pending & STATUSF_IP6)
do_IRQ(RT305X_CPU_IRQ_WNIC);
else if (pending & STATUSF_IP2)
rt305x_intc_irq_dispatch();
else
spurious_interrupt();
}
void __init arch_init_irq(void)
{
mips_cpu_irq_init();
rt305x_intc_irq_init();
}
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