NetBSD-5.0.2/sys/arch/x86/x86/i8259.c
/* $NetBSD: i8259.c,v 1.14 2008/07/03 14:02:25 drochner Exp $ */
/*
* Copyright 2002 (c) Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)isa.c 7.2 (Berkeley) 5/13/91
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i8259.c,v 1.14 2008/07/03 14:02:25 drochner Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <dev/isa/isareg.h>
#include <dev/ic/i8259reg.h>
#include <machine/pio.h>
#include <machine/cpufunc.h>
#include <machine/cpu.h>
#include <machine/pic.h>
#include <machine/i8259.h>
#ifndef __x86_64__
#include "mca.h"
#if NMCA > 0
#include <machine/mca_machdep.h> /* for MCA_system */
#endif
#endif
static void i8259_hwmask(struct pic *, int);
static void i8259_hwunmask(struct pic *, int);
static void i8259_setup(struct pic *, struct cpu_info *, int, int, int);
static void i8259_reinit_irqs(void);
unsigned i8259_imen;
/*
* Perhaps this should be made into a real device.
*/
struct pic i8259_pic = {
.pic_name = "pic0",
.pic_type = PIC_I8259,
.pic_vecbase = 0,
.pic_apicid = 0,
.pic_lock = __SIMPLELOCK_UNLOCKED,
.pic_hwmask = i8259_hwmask,
.pic_hwunmask = i8259_hwunmask,
.pic_addroute = i8259_setup,
.pic_delroute = i8259_setup,
.pic_level_stubs = i8259_stubs,
.pic_edge_stubs = i8259_stubs,
};
void
i8259_default_setup(void)
{
#if NMCA > 0
/* level-triggered interrupts on MCA PS/2s */
if (MCA_system)
/* reset; program device, level-triggered, four bytes */
outb(IO_ICU1 + PIC_ICW1, ICW1_SELECT | ICW1_LTIM | ICW1_IC4);
else
#endif
/* reset; program device, four bytes */
outb(IO_ICU1 + PIC_ICW1, ICW1_SELECT | ICW1_IC4);
/* starting at this vector index */
outb(IO_ICU1 + PIC_ICW2, ICU_OFFSET);
/* slave on line 2 */
outb(IO_ICU1 + PIC_ICW3, ICW3_CASCADE(IRQ_SLAVE));
#ifdef AUTO_EOI_1
/* auto EOI, 8086 mode */
outb(IO_ICU1 + PIC_ICW4, ICW4_AEOI | ICW4_8086);
#else
/* 8086 mode */
outb(IO_ICU1 + PIC_ICW4, ICW4_8086);
#endif
/* leave interrupts masked */
outb(IO_ICU1 + PIC_OCW1, 0xff);
/* special mask mode (if available) */
outb(IO_ICU1 + PIC_OCW3, OCW3_SELECT | OCW3_SSMM | OCW3_SMM);
/* Read IRR by default. */
outb(IO_ICU1 + PIC_OCW3, OCW3_SELECT | OCW3_RR);
#ifdef REORDER_IRQ
/* pri order 3-7, 0-2 (com2 first) */
outb(IO_ICU1 + PIC_OCW2, OCW2_SELECT | OCW2_R | OCW2_SL |
OCW2_ILS(3 - 1));
#endif
#if NMCA > 0
/* level-triggered interrupts on MCA PS/2s */
if (MCA_system)
/* reset; program device, level-triggered, four bytes */
outb(IO_ICU2 + PIC_ICW1, ICW1_SELECT | ICW1_LTIM | ICW1_IC4);
else
#endif
/* reset; program device, four bytes */
outb(IO_ICU2 + PIC_ICW1, ICW1_SELECT | ICW1_IC4);
/* staring at this vector index */
outb(IO_ICU2 + PIC_ICW2, ICU_OFFSET + 8);
/* slave connected to line 2 of master */
outb(IO_ICU2 + PIC_ICW3, ICW3_SIC(IRQ_SLAVE));
#ifdef AUTO_EOI_2
/* auto EOI, 8086 mode */
outb(IO_ICU2 + PIC_ICW4, ICW4_AEOI | ICW4_8086);
#else
/* 8086 mode */
outb(IO_ICU2 + PIC_ICW4, ICW4_8086);
#endif
/* leave interrupts masked */
outb(IO_ICU2 + PIC_OCW1, 0xff);
/* special mask mode (if available) */
outb(IO_ICU2 + PIC_OCW3, OCW3_SELECT | OCW3_SSMM | OCW3_SMM);
/* Read IRR by default. */
outb(IO_ICU2 + PIC_OCW3, OCW3_SELECT | OCW3_RR);
}
static void
i8259_hwmask(struct pic *pic, int pin)
{
unsigned port;
uint8_t byte;
i8259_imen |= (1 << pin);
#ifdef PIC_MASKDELAY
delay(10);
#endif
if (pin > 7) {
port = IO_ICU2 + PIC_OCW1;
byte = i8259_imen >> 8;
} else {
port = IO_ICU1 + PIC_OCW1;
byte = i8259_imen & 0xff;
}
outb(port, byte);
}
static void
i8259_hwunmask(struct pic *pic, int pin)
{
unsigned port;
uint8_t byte;
x86_disable_intr(); /* XXX */
i8259_imen &= ~(1 << pin);
#ifdef PIC_MASKDELAY
delay(10);
#endif
if (pin > 7) {
port = IO_ICU2 + PIC_OCW1;
byte = i8259_imen >> 8;
} else {
port = IO_ICU1 + PIC_OCW1;
byte = i8259_imen & 0xff;
}
outb(port, byte);
x86_enable_intr();
}
static void
i8259_reinit_irqs(void)
{
int irqs, irq;
struct cpu_info *ci = &cpu_info_primary;
irqs = 0;
for (irq = 0; irq < NUM_LEGACY_IRQS; irq++)
if (ci->ci_isources[irq] != NULL)
irqs |= 1 << irq;
if (irqs >= 0x100) /* any IRQs >= 8 in use */
irqs |= 1 << IRQ_SLAVE;
i8259_imen = ~irqs;
outb(IO_ICU1 + PIC_OCW1, i8259_imen);
outb(IO_ICU2 + PIC_OCW1, i8259_imen >> 8);
}
static void
i8259_setup(struct pic *pic, struct cpu_info *ci,
int pin, int idtvec, int type)
{
if (CPU_IS_PRIMARY(ci))
i8259_reinit_irqs();
}
void
i8259_reinit(void)
{
i8259_default_setup();
i8259_reinit_irqs();
}
unsigned
i8259_setmask(unsigned mask)
{
unsigned old = i8259_imen;
i8259_imen = mask;
outb(IO_ICU1 + PIC_OCW1, i8259_imen);
outb(IO_ICU2 + PIC_OCW1, i8259_imen >> 8);
return old;
}