irq.c
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/*
* Interrupt routines for Gemini
*
* Copyright (C) 2001-2006 Storlink, Corp.
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
*
* 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/io.h>
#include <linux/ioport.h>
#include <linux/stddef.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/cpu.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/system_misc.h>
#include <mach/hardware.h>
#define IRQ_SOURCE(base_addr) (base_addr + 0x00)
#define IRQ_MASK(base_addr) (base_addr + 0x04)
#define IRQ_CLEAR(base_addr) (base_addr + 0x08)
#define IRQ_TMODE(base_addr) (base_addr + 0x0C)
#define IRQ_TLEVEL(base_addr) (base_addr + 0x10)
#define IRQ_STATUS(base_addr) (base_addr + 0x14)
#define FIQ_SOURCE(base_addr) (base_addr + 0x20)
#define FIQ_MASK(base_addr) (base_addr + 0x24)
#define FIQ_CLEAR(base_addr) (base_addr + 0x28)
#define FIQ_TMODE(base_addr) (base_addr + 0x2C)
#define FIQ_LEVEL(base_addr) (base_addr + 0x30)
#define FIQ_STATUS(base_addr) (base_addr + 0x34)
static void gemini_ack_irq(struct irq_data *d)
{
__raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
}
static void gemini_mask_irq(struct irq_data *d)
{
unsigned int mask;
mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
mask &= ~(1 << d->irq);
__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
}
static void gemini_unmask_irq(struct irq_data *d)
{
unsigned int mask;
mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
mask |= (1 << d->irq);
__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
}
static struct irq_chip gemini_irq_chip = {
.name = "INTC",
.irq_ack = gemini_ack_irq,
.irq_mask = gemini_mask_irq,
.irq_unmask = gemini_unmask_irq,
};
static struct resource irq_resource = {
.name = "irq_handler",
.start = GEMINI_INTERRUPT_BASE,
.end = FIQ_STATUS(GEMINI_INTERRUPT_BASE) + 4,
};
void __init gemini_init_irq(void)
{
unsigned int i, mode = 0, level = 0;
/*
* Disable the idle handler by default since it is buggy
* For more info see arch/arm/mach-gemini/idle.c
*/
cpu_idle_poll_ctrl(true);
request_resource(&iomem_resource, &irq_resource);
for (i = 0; i < NR_IRQS; i++) {
irq_set_chip(i, &gemini_irq_chip);
if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
irq_set_handler(i, handle_edge_irq);
mode |= 1 << i;
level |= 1 << i;
} else {
irq_set_handler(i, handle_level_irq);
}
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
}
/* Disable all interrupts */
__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
/* Set interrupt mode */
__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
}