forked from Minki/linux
2850bc2737
m68k_handle_int() split in two functions: __m68k_handle_int() takes pt_regs * and does set_irq_regs(); m68k_handle_int() doesn't get pt_regs *. Places where we used to call m68k_handle_int() recursively with the same pt_regs have simply lost the second argument, the rest is switched to __m68k_handle_int(). The rest of patch is just dropping pt_regs * where needed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
332 lines
8.0 KiB
C
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 irqreturn_t (*q40_timer_routine)(int, void *);
|
|
|
|
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 (irqreturn_t (*timer_routine)(int, void *))
|
|
{
|
|
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;
|
|
}
|