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/*
* linux/arch/sh/boards/se/7722/irq.c
*
* Copyright (C) 2007 Nobuhiro Iwamatsu
*
* Hitachi UL SolutionEngine 7722 Support.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <mach-se/mach/se7722.h>
unsigned int se7722_fpga_irq[SE7722_FPGA_IRQ_NR] = { 0, };
static void disable_se7722_irq(struct irq_data *data)
{
unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
__raw_writew(__raw_readw(IRQ01_MASK) | 1 << bit, IRQ01_MASK);
}
static void enable_se7722_irq(struct irq_data *data)
{
unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
__raw_writew(__raw_readw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK);
}
static struct irq_chip se7722_irq_chip __read_mostly = {
.name = "SE7722-FPGA",
.irq_mask = disable_se7722_irq,
.irq_unmask = enable_se7722_irq,
};
static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
{
unsigned short intv = __raw_readw(IRQ01_STS);
unsigned int ext_irq = 0;
intv &= (1 << SE7722_FPGA_IRQ_NR) - 1;
for (; intv; intv >>= 1, ext_irq++) {
if (!(intv & 1))
continue;
generic_handle_irq(se7722_fpga_irq[ext_irq]);
}
}
/*
* Initialize IRQ setting
*/
void __init init_se7722_IRQ(void)
{
int i, irq;
__raw_writew(0, IRQ01_MASK); /* disable all irqs */
__raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */
for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) {
irq = create_irq();
if (irq < 0)
return;
se7722_fpga_irq[i] = irq;
irq_set_chip_and_handler_name(se7722_fpga_irq[i],
&se7722_irq_chip,
handle_level_irq,
"level");
irq_set_chip_data(se7722_fpga_irq[i], (void *)i);
}
irq_set_chained_handler(IRQ0_IRQ, se7722_irq_demux);
irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
irq_set_chained_handler(IRQ1_IRQ, se7722_irq_demux);
irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
}
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