1603b5aca4
This is a big irq cleanup patch. * Use set_irq_chip() to register irq_chip. * Initialize .mask, .unmask, .mask_ack field. Functions for these method are already exist in most case. * Do not initialize .startup, .shutdown, .enable, .disable fields if default routines provided by irq_chip_set_defaults() were suitable. * Remove redundant irq_desc initializations. * Remove unnecessary local_irq_save/local_irq_restore, spin_lock. With this cleanup, it would be easy to switch to slightly lightwait irq flow handlers (handle_level_irq(), etc.) instead of __do_IRQ(). Though whole this patch is quite large, changes in each irq_chip are not quite simple. Please review and test on your platform. Thanks. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
|
|
* 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 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 irq_chip i8259_irq_type = {
|
|
.typename = "XT-PIC",
|
|
.ack = ack_i8259_irq,
|
|
.mask = disable_i8259_irq,
|
|
.mask_ack = ack_i8259_irq,
|
|
.unmask = enable_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++)
|
|
set_irq_chip(i, &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);
|
|
}
|