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/*
* Interrupt handling for IPR-based IRQ.
*
* Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
* Copyright (C) 2000 Kazumoto Kojima
* Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
* Copyright (C) 2006 Paul Mundt
*
* Supported system:
* On-chip supporting modules (TMU, RTC, etc.).
* On-chip supporting modules for SH7709/SH7709A/SH7729/SH7300.
* Hitachi SolutionEngine external I/O:
* MS7709SE01, MS7709ASE01, and MS7750SE01
*
* 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/module.h>
#include <linux/io.h>
#include <linux/interrupt.h>
static void disable_ipr_irq(unsigned int irq)
{
struct ipr_data *p = get_irq_chip_data(irq);
/* Set the priority in IPR to 0 */
ctrl_outw(ctrl_inw(p->addr) & (0xffff ^ (0xf << p->shift)), p->addr);
}
static void enable_ipr_irq(unsigned int irq)
{
struct ipr_data *p = get_irq_chip_data(irq);
/* Set priority in IPR back to original value */
ctrl_outw(ctrl_inw(p->addr) | (p->priority << p->shift), p->addr);
}
static struct irq_chip ipr_irq_chip = {
.name = "IPR",
.mask = disable_ipr_irq,
.unmask = enable_ipr_irq,
.mask_ack = disable_ipr_irq,
};
unsigned int map_ipridx_to_addr(int idx) __attribute__ ((weak));
unsigned int map_ipridx_to_addr(int idx)
{
return 0;
}
void make_ipr_irq(struct ipr_data *table, unsigned int nr_irqs)
{
int i;
for (i = 0; i < nr_irqs; i++) {
unsigned int irq = table[i].irq;
if (!irq)
irq = table[i].irq = i;
/* could the IPR index be mapped, if not we ignore this */
if (!table[i].addr) {
table[i].addr = map_ipridx_to_addr(table[i].ipr_idx);
if (!table[i].addr)
continue;
}
disable_irq_nosync(irq);
set_irq_chip_and_handler_name(irq, &ipr_irq_chip,
handle_level_irq, "level");
set_irq_chip_data(irq, &table[i]);
enable_ipr_irq(irq);
}
}
EXPORT_SYMBOL(make_ipr_irq);
#if !defined(CONFIG_CPU_HAS_PINT_IRQ)
int ipr_irq_demux(int irq)
{
return irq;
}
#endif
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