40220c1a19
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>
332 lines
8 KiB
C
332 lines
8 KiB
C
/*
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* arch/m68k/q40/q40ints.c
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*
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* Copyright (C) 1999,2001 Richard Zidlicky
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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* .. used to be loosely based on bvme6000ints.c
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include <asm/q40_master.h>
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#include <asm/q40ints.h>
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/*
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* Q40 IRQs are defined as follows:
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* 3,4,5,6,7,10,11,14,15 : ISA dev IRQs
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* 16-31: reserved
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* 32 : keyboard int
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* 33 : frame int (50/200 Hz periodic timer)
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* 34 : sample int (10/20 KHz periodic timer)
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*
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*/
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static void q40_irq_handler(unsigned int, struct pt_regs *fp);
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static void q40_enable_irq(unsigned int);
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static void q40_disable_irq(unsigned int);
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unsigned short q40_ablecount[35];
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unsigned short q40_state[35];
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static int q40_irq_startup(unsigned int irq)
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{
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/* test for ISA ints not implemented by HW */
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switch (irq) {
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case 1: case 2: case 8: case 9:
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case 11: case 12: case 13:
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printk("%s: ISA IRQ %d not implemented by HW\n", __FUNCTION__, irq);
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return -ENXIO;
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}
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return 0;
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}
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static void q40_irq_shutdown(unsigned int irq)
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{
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}
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static struct irq_controller q40_irq_controller = {
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.name = "q40",
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.lock = SPIN_LOCK_UNLOCKED,
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.startup = q40_irq_startup,
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.shutdown = q40_irq_shutdown,
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.enable = q40_enable_irq,
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.disable = q40_disable_irq,
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};
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/*
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* void q40_init_IRQ (void)
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*
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* Parameters: None
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*
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* Returns: Nothing
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*
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* This function is called during kernel startup to initialize
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* the q40 IRQ handling routines.
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*/
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static int disabled;
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void q40_init_IRQ(void)
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{
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m68k_setup_irq_controller(&q40_irq_controller, 1, Q40_IRQ_MAX);
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/* setup handler for ISA ints */
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m68k_setup_auto_interrupt(q40_irq_handler);
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m68k_irq_startup(IRQ_AUTO_2);
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m68k_irq_startup(IRQ_AUTO_4);
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/* now enable some ints.. */
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master_outb(1, EXT_ENABLE_REG); /* ISA IRQ 5-15 */
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/* make sure keyboard IRQ is disabled */
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master_outb(0, KEY_IRQ_ENABLE_REG);
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}
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/*
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* this stuff doesn't really belong here..
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*/
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int ql_ticks; /* 200Hz ticks since last jiffie */
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static int sound_ticks;
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#define SVOL 45
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void q40_mksound(unsigned int hz, unsigned int ticks)
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{
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/* for now ignore hz, except that hz==0 switches off sound */
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/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
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if (hz == 0) {
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if (sound_ticks)
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sound_ticks = 1;
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*DAC_LEFT = 128;
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*DAC_RIGHT = 128;
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return;
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}
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/* sound itself is done in q40_timer_int */
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if (sound_ticks == 0)
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sound_ticks = 1000; /* pretty long beep */
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sound_ticks = ticks << 1;
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}
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static irq_handler_t q40_timer_routine;
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static irqreturn_t q40_timer_int (int irq, void * dev)
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{
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ql_ticks = ql_ticks ? 0 : 1;
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if (sound_ticks) {
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unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
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sound_ticks--;
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*DAC_LEFT=sval;
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*DAC_RIGHT=sval;
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}
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if (!ql_ticks)
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q40_timer_routine(irq, dev);
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return IRQ_HANDLED;
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}
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void q40_sched_init (irq_handler_t timer_routine)
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{
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int timer_irq;
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q40_timer_routine = timer_routine;
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timer_irq = Q40_IRQ_FRAME;
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if (request_irq(timer_irq, q40_timer_int, 0,
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"timer", q40_timer_int))
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panic("Couldn't register timer int");
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master_outb(-1, FRAME_CLEAR_REG);
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master_outb( 1, FRAME_RATE_REG);
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}
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/*
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* tables to translate bits into IRQ numbers
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* it is a good idea to order the entries by priority
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*
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*/
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struct IRQ_TABLE{ unsigned mask; int irq ;};
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#if 0
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static struct IRQ_TABLE iirqs[]={
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{Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME},
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{Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
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{0,0}};
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#endif
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static struct IRQ_TABLE eirqs[] = {
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{ .mask = Q40_IRQ3_MASK, .irq = 3 }, /* ser 1 */
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{ .mask = Q40_IRQ4_MASK, .irq = 4 }, /* ser 2 */
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{ .mask = Q40_IRQ14_MASK, .irq = 14 }, /* IDE 1 */
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{ .mask = Q40_IRQ15_MASK, .irq = 15 }, /* IDE 2 */
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{ .mask = Q40_IRQ6_MASK, .irq = 6 }, /* floppy, handled elsewhere */
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{ .mask = Q40_IRQ7_MASK, .irq = 7 }, /* par */
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{ .mask = Q40_IRQ5_MASK, .irq = 5 },
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{ .mask = Q40_IRQ10_MASK, .irq = 10 },
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{0,0}
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};
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/* complain only this many times about spurious ints : */
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static int ccleirq=60; /* ISA dev IRQ's*/
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/*static int cclirq=60;*/ /* internal */
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/* FIXME: add shared ints,mask,unmask,probing.... */
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#define IRQ_INPROGRESS 1
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/*static unsigned short saved_mask;*/
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//static int do_tint=0;
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#define DEBUG_Q40INT
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/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */
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static int mext_disabled=0; /* ext irq disabled by master chip? */
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static int aliased_irq=0; /* how many times inside handler ?*/
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/* got interrupt, dispatch to ISA or keyboard/timer IRQs */
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static void q40_irq_handler(unsigned int irq, struct pt_regs *fp)
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{
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unsigned mir, mer;
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int i;
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//repeat:
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mir = master_inb(IIRQ_REG);
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#ifdef CONFIG_BLK_DEV_FD
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if ((mir & Q40_IRQ_EXT_MASK) &&
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(master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) {
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floppy_hardint();
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return;
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}
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#endif
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switch (irq) {
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case 4:
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case 6:
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__m68k_handle_int(Q40_IRQ_SAMPLE, fp);
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return;
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}
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if (mir & Q40_IRQ_FRAME_MASK) {
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__m68k_handle_int(Q40_IRQ_FRAME, fp);
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master_outb(-1, FRAME_CLEAR_REG);
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}
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if ((mir & Q40_IRQ_SER_MASK) || (mir & Q40_IRQ_EXT_MASK)) {
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mer = master_inb(EIRQ_REG);
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for (i = 0; eirqs[i].mask; i++) {
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if (mer & eirqs[i].mask) {
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irq = eirqs[i].irq;
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/*
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* There is a little mess wrt which IRQ really caused this irq request. The
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* main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
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* are read - which is long after the request came in. In theory IRQs should
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* not just go away but they occassionally do
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*/
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if (irq > 4 && irq <= 15 && mext_disabled) {
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/*aliased_irq++;*/
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goto iirq;
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}
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if (q40_state[irq] & IRQ_INPROGRESS) {
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/* some handlers do local_irq_enable() for irq latency reasons, */
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/* however reentering an active irq handler is not permitted */
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#ifdef IP_USE_DISABLE
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/* in theory this is the better way to do it because it still */
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/* lets through eg the serial irqs, unfortunately it crashes */
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disable_irq(irq);
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disabled = 1;
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#else
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/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",
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irq, disabled ? "already" : "not yet"); */
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fp->sr = (((fp->sr) & (~0x700))+0x200);
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disabled = 1;
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#endif
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goto iirq;
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}
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q40_state[irq] |= IRQ_INPROGRESS;
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__m68k_handle_int(irq, fp);
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q40_state[irq] &= ~IRQ_INPROGRESS;
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/* naively enable everything, if that fails than */
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/* this function will be reentered immediately thus */
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/* getting another chance to disable the IRQ */
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if (disabled) {
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#ifdef IP_USE_DISABLE
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if (irq > 4) {
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disabled = 0;
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enable_irq(irq);
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}
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#else
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disabled = 0;
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/*printk("reenabling irq %d\n", irq); */
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#endif
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}
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// used to do 'goto repeat;' here, this delayed bh processing too long
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return;
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}
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}
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if (mer && ccleirq > 0 && !aliased_irq) {
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printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer);
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ccleirq--;
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}
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}
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iirq:
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mir = master_inb(IIRQ_REG);
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/* should test whether keyboard irq is really enabled, doing it in defhand */
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if (mir & Q40_IRQ_KEYB_MASK)
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__m68k_handle_int(Q40_IRQ_KEYBOARD, fp);
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return;
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}
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void q40_enable_irq(unsigned int irq)
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{
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if (irq >= 5 && irq <= 15) {
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mext_disabled--;
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if (mext_disabled > 0)
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printk("q40_enable_irq : nested disable/enable\n");
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if (mext_disabled == 0)
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master_outb(1, EXT_ENABLE_REG);
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}
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}
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void q40_disable_irq(unsigned int irq)
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{
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/* disable ISA iqs : only do something if the driver has been
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* verified to be Q40 "compatible" - right now IDE, NE2K
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* Any driver should not attempt to sleep across disable_irq !!
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*/
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if (irq >= 5 && irq <= 15) {
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master_outb(0, EXT_ENABLE_REG);
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mext_disabled++;
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if (mext_disabled > 1)
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printk("disable_irq nesting count %d\n",mext_disabled);
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}
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}
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unsigned long q40_probe_irq_on(void)
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{
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printk("irq probing not working - reconfigure the driver to avoid this\n");
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return -1;
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}
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int q40_probe_irq_off(unsigned long irqs)
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{
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return -1;
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}
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