284 lines
7.2 KiB
C
284 lines
7.2 KiB
C
/* $NetBSD: mca_machdep.c,v 1.2 2000/06/04 19:14:47 cgd Exp $ */
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/*
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* Copyright (c) 1996-1999 Scott D. Telford. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Machine-specific functions for MCA autoconfiguration.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/syslog.h>
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#include <machine/bioscall.h>
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#include <machine/psl.h>
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#define _I386_BUS_DMA_PRIVATE
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#include <machine/bus.h>
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#include <i386/isa/icu.h>
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#include <dev/isa/isavar.h>
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#include <dev/isa/isareg.h>
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#include <dev/mca/mcavar.h>
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#include <dev/mca/mcareg.h>
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#include "isa.h"
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#include "opt_mcaverbose.h"
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struct i386_bus_dma_tag mca_bus_dma_tag = {
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NULL, /* _cookie */
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_bus_dmamap_create,
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_bus_dmamap_destroy,
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_bus_dmamap_load,
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_bus_dmamap_load_mbuf,
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_bus_dmamap_load_uio,
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_bus_dmamap_load_raw,
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_bus_dmamap_unload,
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NULL, /* _dmamap_sync */
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_bus_dmamem_alloc,
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_bus_dmamem_free,
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_bus_dmamem_map,
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_bus_dmamem_unmap,
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_bus_dmamem_mmap,
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};
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/* setup by mca_busprobe() */
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int MCA_system = 1; /* XXX force MCA for now */
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int bios_features = 1;
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/* System Configuration Block */
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struct sys_config {
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u_int16_t count;
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u_int8_t model;
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u_int8_t submodel;
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u_int8_t bios_rev;
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u_int8_t feature;
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#define FEATURE_RESV 0x01 /* Reserved */
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#define FEATURE_MCABUS 0x02 /* MicroChannel Architecture */
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#define FEATURE_EBDA 0x04 /* Extended BIOS data area allocated */
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#define FEATURE_WAITEV 0x08 /* Wait for external event is supported */
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#define FEATURE_KBDINT 0x10 /* Keyboard intercept called by Int 09h */
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#define FEATURE_RTC 0x20 /* Real-time clock present */
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#define FEATURE_IC2 0x40 /* Second interrupt chip present */
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#define FEATURE_DMA3 0x80 /* DMA channel 3 used by hard disk BIOS */
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u_int8_t pad[3];
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} __attribute__ ((packed));
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void
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mca_attach_hook(parent, self, mba)
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struct device *parent, *self;
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struct mcabus_attach_args *mba;
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{
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/* Nothing */
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}
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/*
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* Read value of MCA POS register "reg" in slot "slot".
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*/
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int
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mca_conf_read(mc, slot, reg)
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mca_chipset_tag_t mc;
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int slot, reg;
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{
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int data;
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slot &= 7; /* slot must be in range 0-7 */
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outb(MCA_MB_SETUP_REG, 0xff); /* ensure m/board setup is disabled */
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outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET);
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data = inb(MCA_POS_REG(reg));
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outb(MCA_ADAP_SETUP_REG, 0);
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return data;
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}
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/*
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* Write "data" to MCA POS register "reg" in slot "slot".
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*/
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void
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mca_conf_write(mc, slot, reg, data)
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mca_chipset_tag_t mc;
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int slot, reg, data;
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{
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slot&=7; /* slot must be in range 0-7 */
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outb(MCA_MB_SETUP_REG, 0xff); /* ensure m/board setup is disabled */
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outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET);
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outb(MCA_POS_REG(reg), data);
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outb(MCA_ADAP_SETUP_REG, 0);
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}
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#if NISA <= 0
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#error mca_intr_(dis)establish: needs ISA to be configured into kernel
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#endif
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const struct evcnt *
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mca_intr_establish(mca_chipset_tag_t mc, mca_intr_handle_t ih)
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{
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/* XXX for now, no evcnt parent reported */
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return NULL;
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}
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void *
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mca_intr_establish(mc, ih, level, func, arg)
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mca_chipset_tag_t mc;
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mca_intr_handle_t ih;
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int level, (*func) __P((void *));
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void *arg;
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{
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if (ih == 0 || ih >= ICU_LEN || ih == 2)
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panic("mca_intr_establish: bogus handle 0x%x\n", ih);
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/* MCA interrupts are always level-triggered */
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return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg);
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}
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void
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mca_intr_disestablish(mc, cookie)
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mca_chipset_tag_t mc;
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void *cookie;
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{
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return isa_intr_disestablish(NULL, cookie);
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}
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/*
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* Handle a NMI.
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* return true to panic system, false to ignore.
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*/
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int
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mca_nmi()
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{
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/*
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* PS/2 MCA devices can generate NMIs - we can find out which
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* slot generated it from the POS registers.
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*/
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int slot, mcanmi=0;
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/* if there is no MCA bus, call isa_nmi() */
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if (!MCA_system)
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goto out;
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/* ensure motherboard setup is disabled */
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outb(MCA_MB_SETUP_REG, 0xff);
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/* find if an MCA slot has the CHCK bit asserted (low) in POS 5 */
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for(slot=0; slot<MCA_MAX_SLOTS; slot++)
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{
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outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET);
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if ((inb(MCA_POS_REG(5)) & MCA_POS5_CHCK) == 0)
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{
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mcanmi = 1;
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/* find if CHCK status is available in POS 6/7 */
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if((inb(MCA_POS_REG(5)) & MCA_POS5_CHCK_STAT) == 0)
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log(LOG_CRIT, "MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n",
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slot+1, inb(MCA_POS_REG(6)),
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inb(MCA_POS_REG(7)));
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else
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log(LOG_CRIT, "MCA NMI: slot %d\n", slot+1);
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}
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}
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outb(MCA_ADAP_SETUP_REG, 0);
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out:
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#if NISA > 0
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if (!mcanmi) {
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/* no CHCK bits asserted, assume ISA NMI */
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return (isa_nmi());
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} else
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#endif
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return(0);
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}
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void
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mca_busprobe()
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{
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/* According to Linux's linux/arch/i386/boot/setup.S,
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* we can get the extra BIOS information via int 0x15,
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* ah == 0xc0. The extra information is stored on
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* es:bx; it contains two bytes of length, then byte
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* of machine id, byte of machine submodel, byte of BIOS
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* revision number and byte of feature info.
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*/
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/*
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* Scott Telford's code used
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* ((inb(MCA_ADAP_SETUP_REG) & (MCA_ADAP_SET | MCA_ADAP_CHR)) == 0)
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* - somewhat dubious, but good enough.
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*/
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#if notyet
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/*
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* Following has been taken from FreeBSD, for now just for
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* documentation purposes
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*/
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struct bioscallregs regs;
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struct sys_config *scp;
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paddr_t paddr;
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memset(®s, 0, sizeof(regs));
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regs.AX_HI = 0xc0;
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bioscall(0x15, ®s);
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if ((regs.EFLAGS & PSL_C)
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|| (regs.AX_HI != 0 && (regs.FLAGS & PSL_AC)))
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{
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#ifdef MCAVERBOSE
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printf("BIOS SDT: Not supported. Not PS/2?\n");
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#endif
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return;
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}
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paddr = (regs.ES << 4) + regs.BX;
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scp = (struct sys_config *)ISA_HOLE_VADDR(paddr);
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printf("BIOS SDT: model 0x%x, submodel 0x%x, BIOS rev. 0x%x\n",
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scp->model, scp->submodel, scp->bios_rev);
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#ifdef MCAVERBOSE
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printf("BIOS SDT: features 0x%b\n", scp->feature,
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"\20"
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"\01RESV"
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"\02MCABUS"
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"\03EBDA"
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"\04WAITEV"
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"\05KBDINT"
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"\06RTC"
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"\07IC2"
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"\08DMA3\n");
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#endif
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bios_features = scp->feature;
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MCA_system = (bios_features & FEATURE_MCABUS) ? 1 : 0;
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#endif /* 0 */
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}
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