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/*
* arch/mips/vr41xx/nec-cmbvr4133/irq.c
*
* Interrupt routines for the NEC CMB-VR4133 board.
*
* Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and
* Alex Sapkov <asapkov@ru.mvista.com>
*
* 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* Support for NEC-CMBVR4133 in 2.6
* Manish Lachwani (mlachwani@mvista.com)
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/vr41xx/cmbvr4133.h>
extern void enable_8259A_irq(unsigned int irq);
extern void disable_8259A_irq(unsigned int irq);
extern void mask_and_ack_8259A(unsigned int irq);
extern void init_8259A(int hoge);
extern int vr4133_rockhopper;
static unsigned int startup_i8259_irq(unsigned int irq)
{
enable_8259A_irq(irq - I8259_IRQ_BASE);
return 0;
}
static void shutdown_i8259_irq(unsigned int irq)
{
disable_8259A_irq(irq - I8259_IRQ_BASE);
}
static void enable_i8259_irq(unsigned int irq)
{
enable_8259A_irq(irq - I8259_IRQ_BASE);
}
static void disable_i8259_irq(unsigned int irq)
{
disable_8259A_irq(irq - I8259_IRQ_BASE);
}
static void ack_i8259_irq(unsigned int irq)
{
mask_and_ack_8259A(irq - I8259_IRQ_BASE);
}
static void end_i8259_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_8259A_irq(irq - I8259_IRQ_BASE);
}
static struct hw_interrupt_type i8259_irq_type = {
.typename = "XT-PIC",
.startup = startup_i8259_irq,
.shutdown = shutdown_i8259_irq,
.enable = enable_i8259_irq,
.disable = disable_i8259_irq,
.ack = ack_i8259_irq,
.end = end_i8259_irq,
};
static int i8259_get_irq_number(int irq)
{
unsigned long isr;
isr = inb(0x20);
irq = ffz(~isr);
if (irq == 2) {
isr = inb(0xa0);
irq = 8 + ffz(~isr);
}
if (irq < 0 || irq > 15)
return -EINVAL;
return I8259_IRQ_BASE + irq;
}
static struct irqaction i8259_slave_cascade = {
.handler = &no_action,
.name = "cascade",
};
void __init rockhopper_init_irq(void)
{
int i;
if(!vr4133_rockhopper) {
printk(KERN_ERR "Not a Rockhopper Board \n");
return;
}
for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++)
irq_desc[i].chip = &i8259_irq_type;
setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade);
vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH);
vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH);
vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number);
}
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