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/*
* linux/arch/arm/common/vic.c
*
* Copyright (C) 1999 - 2003 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* 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/list.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/hardware/vic.h>
static void vic_mask_irq(unsigned int irq)
{
void __iomem *base = get_irq_chip_data(irq);
irq &= 31;
writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
}
static void vic_unmask_irq(unsigned int irq)
{
void __iomem *base = get_irq_chip_data(irq);
irq &= 31;
writel(1 << irq, base + VIC_INT_ENABLE);
}
static struct irq_chip vic_chip = {
.name = "VIC",
.ack = vic_mask_irq,
.mask = vic_mask_irq,
.unmask = vic_unmask_irq,
};
/**
* vic_init - initialise a vectored interrupt controller
* @base: iomem base address
* @irq_start: starting interrupt number, must be muliple of 32
* @vic_sources: bitmask of interrupt sources to allow
*/
void __init vic_init(void __iomem *base, unsigned int irq_start,
u32 vic_sources)
{
unsigned int i;
/* Disable all interrupts initially. */
writel(0, base + VIC_INT_SELECT);
writel(0, base + VIC_INT_ENABLE);
writel(~0, base + VIC_INT_ENABLE_CLEAR);
writel(0, base + VIC_IRQ_STATUS);
writel(0, base + VIC_ITCR);
writel(~0, base + VIC_INT_SOFT_CLEAR);
/*
* Make sure we clear all existing interrupts
*/
writel(0, base + VIC_VECT_ADDR);
for (i = 0; i < 19; i++) {
unsigned int value;
value = readl(base + VIC_VECT_ADDR);
writel(value, base + VIC_VECT_ADDR);
}
for (i = 0; i < 16; i++) {
void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
writel(VIC_VECT_CNTL_ENABLE | i, reg);
}
writel(32, base + VIC_DEF_VECT_ADDR);
for (i = 0; i < 32; i++) {
unsigned int irq = irq_start + i;
set_irq_chip(irq, &vic_chip);
set_irq_chip_data(irq, base);
if (vic_sources & (1 << i)) {
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
}
}
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