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/* arch/arm/plat-samsung/irq-vic-timer.c
* originally part of arch/arm/plat-s3c64xx/irq.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX - Interrupt handling
*
* 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/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/map.h>
#include <plat/irq-vic-timer.h>
#include <plat/regs-timer.h>
#include <asm/mach/irq.h>
static void s3c_irq_demux_vic_timer(unsigned int irq, struct irq_desc *desc)
{
struct irq_chip *chip = irq_get_chip(irq);
chained_irq_enter(chip, desc);
generic_handle_irq((int)desc->irq_data.handler_data);
chained_irq_exit(chip, desc);
}
/* We assume the IRQ_TIMER0..IRQ_TIMER4 range is continuous. */
static void s3c_irq_timer_ack(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = (1 << 5) << (d->irq - gc->irq_base);
irq_reg_writel(mask | gc->mask_cache, gc->reg_base);
}
/**
* s3c_init_vic_timer_irq() - initialise timer irq chanined off VIC.\
* @num: Number of timers to initialize
* @timer_irq: Base IRQ number to be used for the timers.
*
* Register the necessary IRQ chaining and support for the timer IRQs
* chained of the VIC.
*/
void __init s3c_init_vic_timer_irq(unsigned int num, unsigned int timer_irq)
{
unsigned int pirq[5] = { IRQ_TIMER0_VIC, IRQ_TIMER1_VIC, IRQ_TIMER2_VIC,
IRQ_TIMER3_VIC, IRQ_TIMER4_VIC };
struct irq_chip_generic *s3c_tgc;
struct irq_chip_type *ct;
unsigned int i;
s3c_tgc = irq_alloc_generic_chip("s3c-timer", 1, timer_irq,
S3C64XX_TINT_CSTAT, handle_level_irq);
if (!s3c_tgc) {
pr_err("%s: irq_alloc_generic_chip for IRQ %d failed\n",
__func__, timer_irq);
return;
}
ct = s3c_tgc->chip_types;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
ct->chip.irq_ack = s3c_irq_timer_ack;
irq_setup_generic_chip(s3c_tgc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
/* Clear the upper bits of the mask_cache*/
s3c_tgc->mask_cache &= 0x1f;
for (i = 0; i < num; i++, timer_irq++) {
irq_set_chained_handler(pirq[i], s3c_irq_demux_vic_timer);
irq_set_handler_data(pirq[i], (void *)timer_irq);
}
}
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