NetBSD/sys/arch/alpha/pci/sio_pic.c

347 lines
9.1 KiB
C

/* $NetBSD: sio_pic.c,v 1.19 1997/09/02 13:19:53 thorpej Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: sio_pic.c,v 1.19 1997/09/02 13:19:53 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <alpha/pci/siovar.h>
#ifndef EVCNT_COUNTERS
#include <machine/intrcnt.h>
#endif
#include "sio.h"
/*
* To add to the long history of wonderful PROM console traits,
* AlphaStation PROMs don't reset themselves completely on boot!
* Therefore, if an interrupt was turned on when the kernel was
* started, we're not going to EVER turn it off... I don't know
* what will happen if new interrupts (that the PROM console doesn't
* want) are turned on. I'll burn that bridge when I come to it.
*/
#define BROKEN_PROM_CONSOLE
/*
* Private functions and variables.
*/
bus_space_tag_t sio_iot;
bus_space_handle_t sio_ioh_icu1, sio_ioh_icu2, sio_ioh_elcr;
#define ICU_LEN 16 /* number of ISA IRQs */
static struct alpha_shared_intr *sio_intr;
#ifdef EVCNT_COUNTERS
struct evcnt sio_intr_evcnt;
#endif
#ifndef STRAY_MAX
#ifdef BROKEN_PROM_CONSOLE
/*
* If prom console is broken, because initial interrupt settings
* must be kept, there's no way to escape stray interrupts.
*/
#define STRAY_MAX 0
#else
#define STRAY_MAX 5
#endif
#endif
#ifdef BROKEN_PROM_CONSOLE
/*
* If prom console is broken, must remember the initial interrupt
* settings and enforce them. WHEE!
*/
u_int8_t initial_ocw1[2];
u_int8_t initial_elcr[2];
#define INITIALLY_ENABLED(irq) \
((initial_ocw1[(irq) / 8] & (1 << ((irq) % 8))) == 0)
#define INITIALLY_LEVEL_TRIGGERED(irq) \
((initial_elcr[(irq) / 8] & (1 << ((irq) % 8))) != 0)
#else
#define INITIALLY_ENABLED(irq) ((irq) == 2 ? 1 : 0)
#define INITIALLY_LEVEL_TRIGGERED(irq) 0
#endif
void sio_setirqstat __P((int, int, int));
void
sio_setirqstat(irq, enabled, type)
int irq, enabled;
int type;
{
u_int8_t ocw1[2], elcr[2];
int icu, bit;
#if 0
printf("sio_setirqstat: irq %d: %s, %s\n", irq,
enabled ? "enabled" : "disabled", isa_intr_typename(type));
#endif
icu = irq / 8;
bit = irq % 8;
ocw1[0] = bus_space_read_1(sio_iot, sio_ioh_icu1, 1);
ocw1[1] = bus_space_read_1(sio_iot, sio_ioh_icu2, 1);
elcr[0] = bus_space_read_1(sio_iot, sio_ioh_elcr, 0); /* XXX */
elcr[1] = bus_space_read_1(sio_iot, sio_ioh_elcr, 1); /* XXX */
/*
* interrupt enable: set bit to mask (disable) interrupt.
*/
if (enabled)
ocw1[icu] &= ~(1 << bit);
else
ocw1[icu] |= 1 << bit;
/*
* interrupt type select: set bit to get level-triggered.
*/
if (type == IST_LEVEL)
elcr[icu] |= 1 << bit;
else
elcr[icu] &= ~(1 << bit);
#ifdef not_here
/* see the init function... */
ocw1[0] &= ~0x04; /* always enable IRQ2 on first PIC */
elcr[0] &= ~0x07; /* IRQ[0-2] must be edge-triggered */
elcr[1] &= ~0x21; /* IRQ[13,8] must be edge-triggered */
#endif
#ifdef BROKEN_PROM_CONSOLE
/*
* make sure that the initially clear bits (unmasked interrupts)
* are never set, and that the initially-level-triggered
* intrrupts always remain level-triggered, to keep the prom happy.
*/
if ((ocw1[0] & ~initial_ocw1[0]) != 0 ||
(ocw1[1] & ~initial_ocw1[1]) != 0 ||
(elcr[0] & initial_elcr[0]) != initial_elcr[0] ||
(elcr[1] & initial_elcr[1]) != initial_elcr[1]) {
printf("sio_sis: initial: ocw = (%2x,%2x), elcr = (%2x,%2x)\n",
initial_ocw1[0], initial_ocw1[1],
initial_elcr[0], initial_elcr[1]);
printf(" current: ocw = (%2x,%2x), elcr = (%2x,%2x)\n",
ocw1[0], ocw1[1], elcr[0], elcr[1]);
panic("sio_setirqstat: hosed");
}
#endif
bus_space_write_1(sio_iot, sio_ioh_icu1, 1, ocw1[0]);
bus_space_write_1(sio_iot, sio_ioh_icu2, 1, ocw1[1]);
bus_space_write_1(sio_iot, sio_ioh_elcr, 0, elcr[0]); /* XXX */
bus_space_write_1(sio_iot, sio_ioh_elcr, 1, elcr[1]); /* XXX */
}
void
sio_intr_setup(iot)
bus_space_tag_t iot;
{
int i;
sio_iot = iot;
if (bus_space_map(sio_iot, IO_ICU1, IO_ICUSIZE, 0, &sio_ioh_icu1) ||
bus_space_map(sio_iot, IO_ICU2, IO_ICUSIZE, 0, &sio_ioh_icu2) ||
bus_space_map(sio_iot, 0x4d0, 2, 0, &sio_ioh_elcr))
panic("sio_intr_setup: can't map I/O ports");
#ifdef BROKEN_PROM_CONSOLE
/*
* Remember the initial values, because the prom is stupid.
*/
initial_ocw1[0] = bus_space_read_1(sio_iot, sio_ioh_icu1, 1);
initial_ocw1[1] = bus_space_read_1(sio_iot, sio_ioh_icu2, 1);
initial_elcr[0] = bus_space_read_1(sio_iot, sio_ioh_elcr, 0); /* XXX */
initial_elcr[1] = bus_space_read_1(sio_iot, sio_ioh_elcr, 1); /* XXX */
#if 0
printf("initial_ocw1[0] = 0x%x\n", initial_ocw1[0]);
printf("initial_ocw1[1] = 0x%x\n", initial_ocw1[1]);
printf("initial_elcr[0] = 0x%x\n", initial_elcr[0]);
printf("initial_elcr[1] = 0x%x\n", initial_elcr[1]);
#endif
#endif
sio_intr = alpha_shared_intr_alloc(ICU_LEN);
/*
* set up initial values for interrupt enables.
*/
for (i = 0; i < ICU_LEN; i++) {
alpha_shared_intr_set_maxstrays(sio_intr, i, STRAY_MAX);
switch (i) {
case 0:
case 1:
case 8:
case 13:
/*
* IRQs 0, 1, 8, and 13 must always be
* edge-triggered.
*/
if (INITIALLY_LEVEL_TRIGGERED(i))
printf("sio_intr_setup: %d LT!\n", i);
sio_setirqstat(i, INITIALLY_ENABLED(i), IST_EDGE);
alpha_shared_intr_set_dfltsharetype(sio_intr, i,
IST_EDGE);
break;
case 2:
/*
* IRQ 2 must be edge-triggered, and should be
* enabled (otherwise IRQs 8-15 are ignored).
*/
if (INITIALLY_LEVEL_TRIGGERED(i))
printf("sio_intr_setup: %d LT!\n", i);
if (!INITIALLY_ENABLED(i))
printf("sio_intr_setup: %d not enabled!\n", i);
sio_setirqstat(i, 1, IST_EDGE);
alpha_shared_intr_set_dfltsharetype(sio_intr, i,
IST_UNUSABLE);
break;
default:
/*
* Otherwise, disable the IRQ and set its
* type to (effectively) "unknown."
*/
sio_setirqstat(i, INITIALLY_ENABLED(i),
INITIALLY_LEVEL_TRIGGERED(i) ? IST_LEVEL :
IST_NONE);
alpha_shared_intr_set_dfltsharetype(sio_intr, i,
INITIALLY_LEVEL_TRIGGERED(i) ? IST_LEVEL :
IST_NONE);
break;
}
}
}
const char *
sio_intr_string(v, irq)
void *v;
int irq;
{
static char irqstr[12]; /* 8 + 2 + NULL + sanity */
if (irq == 0 || irq >= ICU_LEN || irq == 2)
panic("sio_intr_string: bogus isa irq 0x%x\n", irq);
sprintf(irqstr, "isa irq %d", irq);
return (irqstr);
}
void *
sio_intr_establish(v, irq, type, level, fn, arg)
void *v, *arg;
int irq;
int type;
int level;
int (*fn)(void *);
{
void *cookie;
if (irq > ICU_LEN || type == IST_NONE)
panic("sio_intr_establish: bogus irq or type");
cookie = alpha_shared_intr_establish(sio_intr, irq, type, level, fn,
arg, "isa irq");
if (cookie)
sio_setirqstat(irq, alpha_shared_intr_isactive(sio_intr, irq),
alpha_shared_intr_get_sharetype(sio_intr, irq));
return (cookie);
}
void
sio_intr_disestablish(v, cookie)
void *v;
void *cookie;
{
printf("sio_intr_disestablish(%p)\n", cookie);
/* XXX */
/* XXX NEVER ALLOW AN INITIALLY-ENABLED INTERRUPT TO BE DISABLED */
/* XXX NEVER ALLOW AN INITIALLY-LT INTERRUPT TO BECOME UNTYPED */
}
void
sio_iointr(framep, vec)
void *framep;
unsigned long vec;
{
int irq;
irq = (vec - 0x800) >> 4;
#ifdef DIAGNOSTIC
if (irq > ICU_LEN || irq < 0)
panic("sio_iointr: irq out of range (%d)", irq);
#endif
#ifdef EVCNT_COUNTERS
sio_intr_evcnt.ev_count++;
#else
#ifdef DEBUG
if (ICU_LEN != INTRCNT_ISA_IRQ_LEN)
panic("sio interrupt counter sizes inconsistent");
#endif
intrcnt[INTRCNT_ISA_IRQ + irq]++;
#endif
if (!alpha_shared_intr_dispatch(sio_intr, irq))
alpha_shared_intr_stray(sio_intr, irq, "isa irq");
/*
* Some versions of the machines which use the SIO
* (or is it some PALcode revisions on those machines?)
* require the non-specific EOI to be fed to the PIC(s)
* by the interrupt handler.
*/
if (irq > 7)
bus_space_write_1(sio_iot,
sio_ioh_icu2, 0, 0x20 | (irq & 0x07)); /* XXX */
bus_space_write_1(sio_iot,
sio_ioh_icu1, 0, 0x20 | (irq > 7 ? 2 : irq)); /* XXX */
}