kernel-ark/arch/m68k/q40/q40ints.c
David Howells 40220c1a19 IRQ: Use the new typedef for interrupt handler function pointers
Use the new typedef for interrupt handler function pointers rather than
actually spelling out the full thing each time.  This was scripted with the
following small shell script:

#!/bin/sh
egrep -nHrl -e 'irqreturn_t[ 	]*[(][*]' $* |
while read i
do
    echo $i
    perl -pi -e 's/irqreturn_t\s*[(]\s*[*]\s*([_a-zA-Z0-9]*)\s*[)]\s*[(]\s*int\s*,\s*void\s*[*]\s*[)]/irq_handler_t \1/g' $i || exit $?
done

Signed-Off-By: David Howells <dhowells@redhat.com>
2006-10-09 12:19:47 +01:00

332 lines
8.0 KiB
C

/*
* arch/m68k/q40/q40ints.c
*
* Copyright (C) 1999,2001 Richard Zidlicky
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* .. used to be loosely based on bvme6000ints.c
*
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/q40_master.h>
#include <asm/q40ints.h>
/*
* Q40 IRQs are defined as follows:
* 3,4,5,6,7,10,11,14,15 : ISA dev IRQs
* 16-31: reserved
* 32 : keyboard int
* 33 : frame int (50/200 Hz periodic timer)
* 34 : sample int (10/20 KHz periodic timer)
*
*/
static void q40_irq_handler(unsigned int, struct pt_regs *fp);
static void q40_enable_irq(unsigned int);
static void q40_disable_irq(unsigned int);
unsigned short q40_ablecount[35];
unsigned short q40_state[35];
static int q40_irq_startup(unsigned int irq)
{
/* test for ISA ints not implemented by HW */
switch (irq) {
case 1: case 2: case 8: case 9:
case 11: case 12: case 13:
printk("%s: ISA IRQ %d not implemented by HW\n", __FUNCTION__, irq);
return -ENXIO;
}
return 0;
}
static void q40_irq_shutdown(unsigned int irq)
{
}
static struct irq_controller q40_irq_controller = {
.name = "q40",
.lock = SPIN_LOCK_UNLOCKED,
.startup = q40_irq_startup,
.shutdown = q40_irq_shutdown,
.enable = q40_enable_irq,
.disable = q40_disable_irq,
};
/*
* void q40_init_IRQ (void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function is called during kernel startup to initialize
* the q40 IRQ handling routines.
*/
static int disabled;
void q40_init_IRQ(void)
{
m68k_setup_irq_controller(&q40_irq_controller, 1, Q40_IRQ_MAX);
/* setup handler for ISA ints */
m68k_setup_auto_interrupt(q40_irq_handler);
m68k_irq_startup(IRQ_AUTO_2);
m68k_irq_startup(IRQ_AUTO_4);
/* now enable some ints.. */
master_outb(1, EXT_ENABLE_REG); /* ISA IRQ 5-15 */
/* make sure keyboard IRQ is disabled */
master_outb(0, KEY_IRQ_ENABLE_REG);
}
/*
* this stuff doesn't really belong here..
*/
int ql_ticks; /* 200Hz ticks since last jiffie */
static int sound_ticks;
#define SVOL 45
void q40_mksound(unsigned int hz, unsigned int ticks)
{
/* for now ignore hz, except that hz==0 switches off sound */
/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
if (hz == 0) {
if (sound_ticks)
sound_ticks = 1;
*DAC_LEFT = 128;
*DAC_RIGHT = 128;
return;
}
/* sound itself is done in q40_timer_int */
if (sound_ticks == 0)
sound_ticks = 1000; /* pretty long beep */
sound_ticks = ticks << 1;
}
static irq_handler_t q40_timer_routine;
static irqreturn_t q40_timer_int (int irq, void * dev)
{
ql_ticks = ql_ticks ? 0 : 1;
if (sound_ticks) {
unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
sound_ticks--;
*DAC_LEFT=sval;
*DAC_RIGHT=sval;
}
if (!ql_ticks)
q40_timer_routine(irq, dev);
return IRQ_HANDLED;
}
void q40_sched_init (irq_handler_t timer_routine)
{
int timer_irq;
q40_timer_routine = timer_routine;
timer_irq = Q40_IRQ_FRAME;
if (request_irq(timer_irq, q40_timer_int, 0,
"timer", q40_timer_int))
panic("Couldn't register timer int");
master_outb(-1, FRAME_CLEAR_REG);
master_outb( 1, FRAME_RATE_REG);
}
/*
* tables to translate bits into IRQ numbers
* it is a good idea to order the entries by priority
*
*/
struct IRQ_TABLE{ unsigned mask; int irq ;};
#if 0
static struct IRQ_TABLE iirqs[]={
{Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME},
{Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
{0,0}};
#endif
static struct IRQ_TABLE eirqs[] = {
{ .mask = Q40_IRQ3_MASK, .irq = 3 }, /* ser 1 */
{ .mask = Q40_IRQ4_MASK, .irq = 4 }, /* ser 2 */
{ .mask = Q40_IRQ14_MASK, .irq = 14 }, /* IDE 1 */
{ .mask = Q40_IRQ15_MASK, .irq = 15 }, /* IDE 2 */
{ .mask = Q40_IRQ6_MASK, .irq = 6 }, /* floppy, handled elsewhere */
{ .mask = Q40_IRQ7_MASK, .irq = 7 }, /* par */
{ .mask = Q40_IRQ5_MASK, .irq = 5 },
{ .mask = Q40_IRQ10_MASK, .irq = 10 },
{0,0}
};
/* complain only this many times about spurious ints : */
static int ccleirq=60; /* ISA dev IRQ's*/
/*static int cclirq=60;*/ /* internal */
/* FIXME: add shared ints,mask,unmask,probing.... */
#define IRQ_INPROGRESS 1
/*static unsigned short saved_mask;*/
//static int do_tint=0;
#define DEBUG_Q40INT
/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */
static int mext_disabled=0; /* ext irq disabled by master chip? */
static int aliased_irq=0; /* how many times inside handler ?*/
/* got interrupt, dispatch to ISA or keyboard/timer IRQs */
static void q40_irq_handler(unsigned int irq, struct pt_regs *fp)
{
unsigned mir, mer;
int i;
//repeat:
mir = master_inb(IIRQ_REG);
#ifdef CONFIG_BLK_DEV_FD
if ((mir & Q40_IRQ_EXT_MASK) &&
(master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) {
floppy_hardint();
return;
}
#endif
switch (irq) {
case 4:
case 6:
__m68k_handle_int(Q40_IRQ_SAMPLE, fp);
return;
}
if (mir & Q40_IRQ_FRAME_MASK) {
__m68k_handle_int(Q40_IRQ_FRAME, fp);
master_outb(-1, FRAME_CLEAR_REG);
}
if ((mir & Q40_IRQ_SER_MASK) || (mir & Q40_IRQ_EXT_MASK)) {
mer = master_inb(EIRQ_REG);
for (i = 0; eirqs[i].mask; i++) {
if (mer & eirqs[i].mask) {
irq = eirqs[i].irq;
/*
* There is a little mess wrt which IRQ really caused this irq request. The
* main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
* are read - which is long after the request came in. In theory IRQs should
* not just go away but they occassionally do
*/
if (irq > 4 && irq <= 15 && mext_disabled) {
/*aliased_irq++;*/
goto iirq;
}
if (q40_state[irq] & IRQ_INPROGRESS) {
/* some handlers do local_irq_enable() for irq latency reasons, */
/* however reentering an active irq handler is not permitted */
#ifdef IP_USE_DISABLE
/* in theory this is the better way to do it because it still */
/* lets through eg the serial irqs, unfortunately it crashes */
disable_irq(irq);
disabled = 1;
#else
/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",
irq, disabled ? "already" : "not yet"); */
fp->sr = (((fp->sr) & (~0x700))+0x200);
disabled = 1;
#endif
goto iirq;
}
q40_state[irq] |= IRQ_INPROGRESS;
__m68k_handle_int(irq, fp);
q40_state[irq] &= ~IRQ_INPROGRESS;
/* naively enable everything, if that fails than */
/* this function will be reentered immediately thus */
/* getting another chance to disable the IRQ */
if (disabled) {
#ifdef IP_USE_DISABLE
if (irq > 4) {
disabled = 0;
enable_irq(irq);
}
#else
disabled = 0;
/*printk("reenabling irq %d\n", irq); */
#endif
}
// used to do 'goto repeat;' here, this delayed bh processing too long
return;
}
}
if (mer && ccleirq > 0 && !aliased_irq) {
printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer);
ccleirq--;
}
}
iirq:
mir = master_inb(IIRQ_REG);
/* should test whether keyboard irq is really enabled, doing it in defhand */
if (mir & Q40_IRQ_KEYB_MASK)
__m68k_handle_int(Q40_IRQ_KEYBOARD, fp);
return;
}
void q40_enable_irq(unsigned int irq)
{
if (irq >= 5 && irq <= 15) {
mext_disabled--;
if (mext_disabled > 0)
printk("q40_enable_irq : nested disable/enable\n");
if (mext_disabled == 0)
master_outb(1, EXT_ENABLE_REG);
}
}
void q40_disable_irq(unsigned int irq)
{
/* disable ISA iqs : only do something if the driver has been
* verified to be Q40 "compatible" - right now IDE, NE2K
* Any driver should not attempt to sleep across disable_irq !!
*/
if (irq >= 5 && irq <= 15) {
master_outb(0, EXT_ENABLE_REG);
mext_disabled++;
if (mext_disabled > 1)
printk("disable_irq nesting count %d\n",mext_disabled);
}
}
unsigned long q40_probe_irq_on(void)
{
printk("irq probing not working - reconfigure the driver to avoid this\n");
return -1;
}
int q40_probe_irq_off(unsigned long irqs)
{
return -1;
}