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/*
* linux/arch/sh/boards/se/7724/irq.c
*
* Copyright (C) 2009 Renesas Solutions Corp.
*
* Kuninori Morimoto <morimoto.kuninori@renesas.com>
*
* Based on linux/arch/sh/boards/se/7722/irq.c
* Copyright (C) 2007 Nobuhiro Iwamatsu
*
* Hitachi UL SolutionEngine 7724 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/se7724.h>
struct fpga_irq {
unsigned long sraddr;
unsigned long mraddr;
unsigned short mask;
unsigned int base;
};
static unsigned int fpga2irq(unsigned int irq)
{
if (irq >= IRQ0_BASE &&
irq <= IRQ0_END)
return IRQ0_IRQ;
else if (irq >= IRQ1_BASE &&
irq <= IRQ1_END)
return IRQ1_IRQ;
else
return IRQ2_IRQ;
}
static struct fpga_irq get_fpga_irq(unsigned int irq)
{
struct fpga_irq set;
switch (irq) {
case IRQ0_IRQ:
set.sraddr = IRQ0_SR;
set.mraddr = IRQ0_MR;
set.mask = IRQ0_MASK;
set.base = IRQ0_BASE;
break;
case IRQ1_IRQ:
set.sraddr = IRQ1_SR;
set.mraddr = IRQ1_MR;
set.mask = IRQ1_MASK;
set.base = IRQ1_BASE;
break;
default:
set.sraddr = IRQ2_SR;
set.mraddr = IRQ2_MR;
set.mask = IRQ2_MASK;
set.base = IRQ2_BASE;
break;
}
return set;
}
static void disable_se7724_irq(struct irq_data *data)
{
unsigned int irq = data->irq;
struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
unsigned int bit = irq - set.base;
__raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr);
}
static void enable_se7724_irq(struct irq_data *data)
{
unsigned int irq = data->irq;
struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
unsigned int bit = irq - set.base;
__raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
}
static struct irq_chip se7724_irq_chip __read_mostly = {
.name = "SE7724-FPGA",
.irq_mask = disable_se7724_irq,
.irq_unmask = enable_se7724_irq,
};
static void se7724_irq_demux(unsigned int irq, struct irq_desc *desc)
{
struct fpga_irq set = get_fpga_irq(irq);
unsigned short intv = __raw_readw(set.sraddr);
unsigned int ext_irq = set.base;
intv &= set.mask;
for (; intv; intv >>= 1, ext_irq++) {
if (!(intv & 1))
continue;
generic_handle_irq(ext_irq);
}
}
/*
* Initialize IRQ setting
*/
void __init init_se7724_IRQ(void)
{
int i, nid = cpu_to_node(boot_cpu_data);
__raw_writew(0xffff, IRQ0_MR); /* mask all */
__raw_writew(0xffff, IRQ1_MR); /* mask all */
__raw_writew(0xffff, IRQ2_MR); /* mask all */
__raw_writew(0x0000, IRQ0_SR); /* clear irq */
__raw_writew(0x0000, IRQ1_SR); /* clear irq */
__raw_writew(0x0000, IRQ2_SR); /* clear irq */
__raw_writew(0x002a, IRQ_MODE); /* set irq type */
for (i = 0; i < SE7724_FPGA_IRQ_NR; i++) {
int irq, wanted;
wanted = SE7724_FPGA_IRQ_BASE + i;
irq = create_irq_nr(wanted, nid);
if (unlikely(irq == 0)) {
pr_err("%s: failed hooking irq %d for FPGA\n",
__func__, wanted);
return;
}
if (unlikely(irq != wanted)) {
pr_err("%s: got irq %d but wanted %d, bailing.\n",
__func__, irq, wanted);
destroy_irq(irq);
return;
}
set_irq_chip_and_handler_name(irq,
&se7724_irq_chip,
handle_level_irq, "level");
}
set_irq_chained_handler(IRQ0_IRQ, se7724_irq_demux);
set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
set_irq_chained_handler(IRQ1_IRQ, se7724_irq_demux);
set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
set_irq_chained_handler(IRQ2_IRQ, se7724_irq_demux);
set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
}
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