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/*
* linux/arch/sh/boards/systemh/irq.c
*
* Copyright (C) 2000 Kazumoto Kojima
*
* Hitachi SystemH Support.
*
* Modified for 7751 SystemH by
* Jonathan Short.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <asm/io.h>
#include <asm/mach/7751systemh.h>
#include <asm/smc37c93x.h>
/* address of external interrupt mask register
* address must be set prior to use these (maybe in init_XXX_irq())
* XXX : is it better to use .config than specifying it in code? */
static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004;
static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000;
/* forward declaration */
static unsigned int startup_systemh_irq(unsigned int irq);
static void shutdown_systemh_irq(unsigned int irq);
static void enable_systemh_irq(unsigned int irq);
static void disable_systemh_irq(unsigned int irq);
static void mask_and_ack_systemh(unsigned int);
static void end_systemh_irq(unsigned int irq);
/* hw_interrupt_type */
static struct hw_interrupt_type systemh_irq_type = {
.typename = " SystemH Register",
.startup = startup_systemh_irq,
.shutdown = shutdown_systemh_irq,
.enable = enable_systemh_irq,
.disable = disable_systemh_irq,
.ack = mask_and_ack_systemh,
.end = end_systemh_irq
};
static unsigned int startup_systemh_irq(unsigned int irq)
{
enable_systemh_irq(irq);
return 0; /* never anything pending */
}
static void shutdown_systemh_irq(unsigned int irq)
{
disable_systemh_irq(irq);
}
static void disable_systemh_irq(unsigned int irq)
{
if (systemh_irq_mask_register) {
unsigned long flags;
unsigned long val, mask = 0x01 << 1;
/* Clear the "irq"th bit in the mask and set it in the request */
local_irq_save(flags);
val = ctrl_inl((unsigned long)systemh_irq_mask_register);
val &= ~mask;
ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
val = ctrl_inl((unsigned long)systemh_irq_request_register);
val |= mask;
ctrl_outl(val, (unsigned long)systemh_irq_request_register);
local_irq_restore(flags);
}
}
static void enable_systemh_irq(unsigned int irq)
{
if (systemh_irq_mask_register) {
unsigned long flags;
unsigned long val, mask = 0x01 << 1;
/* Set "irq"th bit in the mask register */
local_irq_save(flags);
val = ctrl_inl((unsigned long)systemh_irq_mask_register);
val |= mask;
ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
local_irq_restore(flags);
}
}
static void mask_and_ack_systemh(unsigned int irq)
{
disable_systemh_irq(irq);
}
static void end_systemh_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_systemh_irq(irq);
}
void make_systemh_irq(unsigned int irq)
{
disable_irq_nosync(irq);
irq_desc[irq].handler = &systemh_irq_type;
disable_systemh_irq(irq);
}
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