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/*
* Interrupt handling for Simple external interrupt mask register
*
* Copyright (C) 2001 A&D Co., Ltd. <http://www.aandd.co.jp>
*
* This is for the machine which have single 16 bit register
* for masking external IRQ individually.
* Each bit of the register is for masking each interrupt.
*
* This file may be copied or modified under the terms of the GNU
* General Public License. See linux/COPYING for more information.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/system.h>
#include <asm/io.h>
/* address of external interrupt mask register */
unsigned long irq_mask_register;
/* forward declaration */
static unsigned int startup_maskreg_irq(unsigned int irq);
static void shutdown_maskreg_irq(unsigned int irq);
static void enable_maskreg_irq(unsigned int irq);
static void disable_maskreg_irq(unsigned int irq);
static void mask_and_ack_maskreg(unsigned int);
static void end_maskreg_irq(unsigned int irq);
/* hw_interrupt_type */
static struct hw_interrupt_type maskreg_irq_type = {
.typename = "Mask Register",
.startup = startup_maskreg_irq,
.shutdown = shutdown_maskreg_irq,
.enable = enable_maskreg_irq,
.disable = disable_maskreg_irq,
.ack = mask_and_ack_maskreg,
.end = end_maskreg_irq
};
/* actual implementatin */
static unsigned int startup_maskreg_irq(unsigned int irq)
{
enable_maskreg_irq(irq);
return 0; /* never anything pending */
}
static void shutdown_maskreg_irq(unsigned int irq)
{
disable_maskreg_irq(irq);
}
static void disable_maskreg_irq(unsigned int irq)
{
unsigned long flags;
unsigned short val, mask = 0x01 << irq;
BUG_ON(!irq_mask_register);
/* Set "irq"th bit */
local_irq_save(flags);
val = ctrl_inw(irq_mask_register);
val |= mask;
ctrl_outw(val, irq_mask_register);
local_irq_restore(flags);
}
static void enable_maskreg_irq(unsigned int irq)
{
unsigned long flags;
unsigned short val, mask = ~(0x01 << irq);
BUG_ON(!irq_mask_register);
/* Clear "irq"th bit */
local_irq_save(flags);
val = ctrl_inw(irq_mask_register);
val &= mask;
ctrl_outw(val, irq_mask_register);
local_irq_restore(flags);
}
static void mask_and_ack_maskreg(unsigned int irq)
{
disable_maskreg_irq(irq);
}
static void end_maskreg_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_maskreg_irq(irq);
}
void make_maskreg_irq(unsigned int irq)
{
disable_irq_nosync(irq);
irq_desc[irq].handler = &maskreg_irq_type;
disable_maskreg_irq(irq);
}
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