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/* $Id: irq.c,v 1.1.2.4 2002/11/04 20:33:56 lethal Exp $
*
* arch/sh/boards/cqreek/irq.c
*
* Copyright (C) 2000 Niibe Yutaka
*
* CqREEK IDE/ISA Bridge Support.
*
*/
#include <linux/irq.h>
#include <linux/init.h>
#include <asm/cqreek/cqreek.h>
#include <asm/io.h>
#include <asm/io_generic.h>
#include <asm/irq.h>
#include <asm/machvec.h>
#include <asm/machvec_init.h>
#include <asm/rtc.h>
struct cqreek_irq_data {
unsigned short mask_port; /* Port of Interrupt Mask Register */
unsigned short stat_port; /* Port of Interrupt Status Register */
unsigned short bit; /* Value of the bit */
};
static struct cqreek_irq_data cqreek_irq_data[NR_IRQS];
static void disable_cqreek_irq(unsigned int irq)
{
unsigned long flags;
unsigned short mask;
unsigned short mask_port = cqreek_irq_data[irq].mask_port;
unsigned short bit = cqreek_irq_data[irq].bit;
local_irq_save(flags);
/* Disable IRQ */
mask = inw(mask_port) & ~bit;
outw_p(mask, mask_port);
local_irq_restore(flags);
}
static void enable_cqreek_irq(unsigned int irq)
{
unsigned long flags;
unsigned short mask;
unsigned short mask_port = cqreek_irq_data[irq].mask_port;
unsigned short bit = cqreek_irq_data[irq].bit;
local_irq_save(flags);
/* Enable IRQ */
mask = inw(mask_port) | bit;
outw_p(mask, mask_port);
local_irq_restore(flags);
}
static void mask_and_ack_cqreek(unsigned int irq)
{
unsigned short stat_port = cqreek_irq_data[irq].stat_port;
unsigned short bit = cqreek_irq_data[irq].bit;
disable_cqreek_irq(irq);
/* Clear IRQ (it might be edge IRQ) */
inw(stat_port);
outw_p(bit, stat_port);
}
static void end_cqreek_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_cqreek_irq(irq);
}
static unsigned int startup_cqreek_irq(unsigned int irq)
{
enable_cqreek_irq(irq);
return 0;
}
static void shutdown_cqreek_irq(unsigned int irq)
{
disable_cqreek_irq(irq);
}
static struct hw_interrupt_type cqreek_irq_type = {
.typename = "CqREEK-IRQ",
.startup = startup_cqreek_irq,
.shutdown = shutdown_cqreek_irq,
.enable = enable_cqreek_irq,
.disable = disable_cqreek_irq,
.ack = mask_and_ack_cqreek,
.end = end_cqreek_irq
};
int cqreek_has_ide, cqreek_has_isa;
/* XXX: This is just for test for my NE2000 ISA board
What we really need is virtualized IRQ and demultiplexer like HP600 port */
void __init init_cqreek_IRQ(void)
{
if (cqreek_has_ide) {
cqreek_irq_data[14].mask_port = BRIDGE_IDE_INTR_MASK;
cqreek_irq_data[14].stat_port = BRIDGE_IDE_INTR_STAT;
cqreek_irq_data[14].bit = 1;
irq_desc[14].handler = &cqreek_irq_type;
irq_desc[14].status = IRQ_DISABLED;
irq_desc[14].action = 0;
irq_desc[14].depth = 1;
disable_cqreek_irq(14);
}
if (cqreek_has_isa) {
cqreek_irq_data[10].mask_port = BRIDGE_ISA_INTR_MASK;
cqreek_irq_data[10].stat_port = BRIDGE_ISA_INTR_STAT;
cqreek_irq_data[10].bit = (1 << 10);
/* XXX: Err... we may need demultiplexer for ISA irq... */
irq_desc[10].handler = &cqreek_irq_type;
irq_desc[10].status = IRQ_DISABLED;
irq_desc[10].action = 0;
irq_desc[10].depth = 1;
disable_cqreek_irq(10);
}
}
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