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* arch/m68k/q40/q40ints.c
*
* Copyright (C) 1999 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.
*
* losely based on bvme6000ints.c
*
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.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 Hz periodic timer)
* 34 : sample int (10/20 KHz periodic timer)
*
*/
extern int ints_inited;
void q40_irq2_handler (int, void *, struct pt_regs *fp);
extern void (*q40_sys_default_handler[]) (int, void *, struct pt_regs *); /* added just for debugging */
static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs);
/*
* This should ideally be 4 elements only, for speed.
*/
#define DEVNAME_SIZE 24
static struct {
void (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
void *dev_id;
char devname[DEVNAME_SIZE];
unsigned count;
} irq_tab[Q40_IRQ_MAX+1];
/*
* void q40_init_IRQ (void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function is called during kernel startup to initialize
* the q40 IRQ handling routines.
*/
void q40_init_IRQ (void)
{
int i;
for (i = 0; i <= Q40_IRQ_MAX; i++) {
irq_tab[i].handler = q40_defhand;
irq_tab[i].flags = IRQ_FLG_STD;
irq_tab[i].dev_id = NULL;
irq_tab[i].devname[0] = 0;
irq_tab[i].count = 0;
}
/* setup handler for ISA ints */
sys_request_irq(IRQ2,q40_irq2_handler, IRQ_FLG_LOCK, "q40 ISA and master chip", NULL);
/* now enable some ints.. */
#if 0 /* has been abandoned */
master_outb(1,SER_ENABLE_REG);
#endif
master_outb(1,EXT_ENABLE_REG);
/* would be spurious ints by now, q40kbd_init_hw() does that */
master_outb(0,KEY_IRQ_ENABLE_REG);
}
int q40_request_irq(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
/*printk("q40_request_irq %d, %s\n",irq,devname);*/
if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
/* test for ISA ints not implemented by HW */
if (irq<15)
{
switch (irq){
case 1: case 2: case 8: case 9:
case 12: case 13:
printk("%s: ISA IRQ %d from %s not implemented by HW\n", __FUNCTION__, irq, devname);
return -ENXIO;
default:
}
}
if (irq<Q40_IRQ_TIMER)
{
if (irq==11) {
printk("warning IRQ 10 and 11 not distinguishable\n");
irq=10;
}
if (!(irq_tab[irq].flags & IRQ_FLG_STD))
{
if (irq_tab[irq].flags & IRQ_FLG_LOCK)
{
printk("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_tab[irq].devname);
return -EBUSY;
}
if (flags & IRQ_FLG_REPLACE)
{
printk("%s: %s can't replace IRQ %d from %s\n",
__FUNCTION__, devname, irq, irq_tab[irq].devname);
return -EBUSY;
}
}
/*printk("IRQ %d set to handler %p\n",irq,handler);*/
irq_tab[irq].handler = handler;
irq_tab[irq].flags = flags;
irq_tab[irq].dev_id = dev_id;
strncpy(irq_tab[irq].devname,devname,DEVNAME_SIZE);
return 0;
}
else {
/* Q40_IRQ_TIMER :somewhat special actions required here ..*/
sys_request_irq(4,handler,flags,devname,dev_id);
sys_request_irq(6,handler,flags,devname,dev_id);
return 0;
}
}
void q40_free_irq(unsigned int irq, void *dev_id)
{
if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
printk("%s: Incorrect IRQ %d, dev_id %x \n", __FUNCTION__, irq, (unsigned)dev_id);
return;
}
/* test for ISA ints not implemented by HW */
if (irq<15) {
switch (irq){
case 1: case 2: case 8: case 9:
case 12: case 13:
printk("%s: ISA IRQ %d from %x illegal\n", __FUNCTION__, irq, (unsigned)dev_id);
return;
default:
}
}
if (irq<Q40_IRQ_TIMER){
if (irq==11) irq=10;
if (irq_tab[irq].dev_id != dev_id)
printk("%s: Removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, irq_tab[irq].devname);
irq_tab[irq].handler = q40_defhand;
irq_tab[irq].flags = IRQ_FLG_STD;
irq_tab[irq].dev_id = NULL;
/* irq_tab[irq].devname = NULL; */
} else { /* == Q40_IRQ_TIMER */
sys_free_irq(4,dev_id);
sys_free_irq(6,dev_id);
}
}
#if 1
void q40_process_int (int level, struct pt_regs *fp)
{
printk("unexpected interrupt %x\n",level);
}
#endif
/*
* 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 ;};
static struct IRQ_TABLE iirqs[]={
{IRQ_FRAME_MASK,Q40_IRQ_FRAME},
{IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
{0,0}};
static struct IRQ_TABLE eirqs[]={
{IRQ3_MASK,3}, /* ser 1 */
{IRQ4_MASK,4}, /* ser 2 */
{IRQ14_MASK,14}, /* IDE 1 */
{IRQ15_MASK,15}, /* IDE 2 */
{IRQ6_MASK,6}, /* floppy */
{IRQ7_MASK,7}, /* par */
{IRQ5_MASK,5},
{IRQ10_MASK,10},
{0,0}};
/* complaiun only this many times about spurious ints : */
static int ccleirq=60; /* ISA dev IRQ's*/
static int cclirq=60; /* internal */
/* FIX: add IRQ_INPROGRESS,mask,unmask,probing.... */
void q40_irq2_handler (int vec, void *devname, struct pt_regs *fp)
{
/* got level 2 interrupt, dispatch to ISA or keyboard IRQs */
unsigned mir=master_inb(IIRQ_REG);
unsigned mer;
int irq,i;
/*
* more than 1 bit might be set, must handle atmost 1 int source,
* - handle only those with explicitly set handler
*/
if ((mir&IRQ_SER_MASK) || (mir&IRQ_EXT_MASK))
{
/* some ISA dev caused the int */
mer=master_inb(EIRQ_REG);
for (i=0; eirqs[i].mask; i++)
{
if (mer&(eirqs[i].mask))
{
irq=eirqs[i].irq;
irq_tab[irq].count++;
if (irq_tab[irq].handler == q40_defhand )
continue; /* ignore uninited INTs :-( */
irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
return;
}
}
if (ccleirq>0)
printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--;
}
else
{
/* internal */
for (i=0; iirqs[i].mask; i++)
{
if (mir&(iirqs[i].mask))
{
irq=iirqs[i].irq;
irq_tab[irq].count++;
if (irq_tab[irq].handler == q40_defhand )
continue; /* ignore uninited INTs :-( */
irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
return;
}
}
if (cclirq>0)
printk("internal level 2 interrupt from unknown source ? IIRQ_REG=%x\n",mir),cclirq--;
}
}
int q40_get_irq_list (char *buf)
{
int i, len = 0;
for (i = 0; i <= Q40_IRQ_MAX; i++) {
if (irq_tab[i].count)
len += sprintf (buf+len, "Vec 0x%02x: %8d %s%s\n",
i, irq_tab[i].count,
irq_tab[i].devname[0] ? irq_tab[i].devname : "?",
irq_tab[i].handler == q40_defhand ?
" (now unassigned)" : "");
}
return len;
}
static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
{
#if 0
printk ("Unknown q40 interrupt 0x%02x\n", irq);
#endif
}
static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs)
{
#if 0
if (ints_inited)
#endif
printk ("Uninitialised interrupt level %d\n", lev);
#if 0
else
printk ("Interrupt before interrupt initialisation\n");
#endif
}
void (*q40_sys_default_handler[SYS_IRQS]) (int, void *, struct pt_regs *) = {
sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler,
sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler
};
void q40_enable_irq (unsigned int irq)
{
}
void q40_disable_irq (unsigned int irq)
{
}
unsigned long q40_probe_irq_on (void)
{
printk("sorry, irq probing not yet implemented - reconfigure the driver to avoid this\n");
return 0;
}
int q40_probe_irq_off (unsigned long irqs)
{
return -1;
}
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