92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/* $OpenBSD: isa_machdep.c,v 1.1 2010/05/08 21:59:56 miod Exp $ */
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/*
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* Copyright (c) 2009, 2010 Miodrag Vallat.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Legacy device support.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <mips/cpuregs.h>
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#include <evbmips/loongson/autoconf.h>
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#include <machine/intr.h>
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#include <dev/ic/i8259reg.h>
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#include <dev/pci/pcivar.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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#include <mips/bonito/bonitoreg.h>
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#include <mips/bonito/bonitovar.h>
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#include <evbmips/loongson/loongson_isa.h>
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uint loongson_isaimr;
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void
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loongson_set_isa_imr(uint newimr)
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{
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uint imr1, imr2;
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imr1 = 0xff & ~newimr;
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imr1 &= ~(1 << 2); /* enable cascade */
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imr2 = 0xff & ~(newimr >> 8);
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/*
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* For some reason, trying to write the same value to the PIC
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* registers causes an immediate system freeze (at least on the
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* 2F and CS5536 based Lemote Yeeloong), so we only do this if
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* the value changes.
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* Note that interrupts have been disabled by the caller.
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*/
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//if ((newimr ^ loongson_isaimr) & 0xff00)
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + 1) = imr2;
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//if ((newimr ^ loongson_isaimr) & 0x00ff)
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + 1) = imr1;
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__asm__ __volatile__ ("sync" ::: "memory");
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loongson_isaimr = newimr;
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}
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void
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loongson_isa_specific_eoi(int bit)
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{
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KASSERT((bit < 16) && (bit >= 0));
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loongson_isaimr &= ~(1 << bit);
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if (bit & 8) {
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(void)REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + 1);
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + 1) =
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(0xff & ~(loongson_isaimr >> 8));
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__asm__ __volatile__ ("sync" ::: "memory");
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW2) =
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OCW2_SELECT | OCW2_EOI | OCW2_SL | OCW2_ILS(bit & 7);
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bit = 2;
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__asm__ __volatile__ ("sync" ::: "memory");
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}
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(void)REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + 1);
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + 1) =
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(0xff & ~(loongson_isaimr));
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__asm__ __volatile__ ("sync" ::: "memory");
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REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW2) =
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OCW2_SELECT | OCW2_EOI | OCW2_SL | OCW2_ILS(bit);
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__asm__ __volatile__ ("sync" ::: "memory");
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}
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