/* $NetBSD: am79c930.c,v 1.16 2008/04/28 20:23:49 martin Exp $ */

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Bill Sommerfeld
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* Am79c930 chip driver.
*
* This is used by the awi driver to use the shared
* memory attached to the 79c930 to communicate with the firmware running
* in the 930's on-board 80188 core.
*
* The 79c930 can be mapped into just I/O space, or also have a
* memory mapping; the mapping must be set up by the bus front-end
* before am79c930_init is called.
*/

/*
* operations:
*
* read_8, read_16, read_32, read_64, read_bytes
* write_8, write_16, write_32, write_64, write_bytes
* (two versions, depending on whether memory-space or i/o space is in use).
*
* interrupt E.C.
* start isr
* end isr
*/

#include <sys/cdefs.h>
#ifdef __NetBSD__
__KERNEL_RCSID(0, "$NetBSD: am79c930.c,v 1.16 2008/04/28 20:23:49 martin Exp $");
#endif
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#ifndef __FreeBSD__
#include <sys/device.h>
#endif

#include <sys/cpu.h>
#ifdef __FreeBSD__
#include <machine/bus_pio.h>
#include <machine/bus_memio.h>
#endif
#include <sys/bus.h>
#ifdef __NetBSD__
#include <sys/intr.h>
#endif

#ifdef __NetBSD__
#include <dev/ic/am79c930reg.h>
#include <dev/ic/am79c930var.h>
#endif
#ifdef __FreeBSD__
#include <dev/awi/am79c930reg.h>
#include <dev/awi/am79c930var.h>
#endif

#define AM930_DELAY(x) /*nothing*/

#ifndef __BUS_SPACE_HAS_STREAM_METHODS
#define bus_space_read_stream_2         bus_space_read_2
#define bus_space_read_stream_4         bus_space_read_4
#define bus_space_write_stream_2        bus_space_write_2
#define bus_space_write_stream_4        bus_space_write_4
#endif /* __BUS_SPACE_HAS_STREAM_METHODS */

void am79c930_regdump(struct am79c930_softc *sc);

static void io_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
static void io_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
static void io_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
static void io_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);

static u_int8_t io_read_1(struct am79c930_softc *, u_int32_t);
static u_int16_t io_read_2(struct am79c930_softc *, u_int32_t);
static u_int32_t io_read_4(struct am79c930_softc *, u_int32_t);
static void io_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);

static void mem_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
static void mem_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
static void mem_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
static void mem_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);

static u_int8_t mem_read_1(struct am79c930_softc *, u_int32_t);
static u_int16_t mem_read_2(struct am79c930_softc *, u_int32_t);
static u_int32_t mem_read_4(struct am79c930_softc *, u_int32_t);
static void mem_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);

static struct am79c930_ops iospace_ops = {
       io_write_1,
       io_write_2,
       io_write_4,
       io_write_bytes,
       io_read_1,
       io_read_2,
       io_read_4,
       io_read_bytes
};

struct am79c930_ops memspace_ops = {
       mem_write_1,
       mem_write_2,
       mem_write_4,
       mem_write_bytes,
       mem_read_1,
       mem_read_2,
       mem_read_4,
       mem_read_bytes
};

static void
io_write_1( struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
{
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA, val);
       AM930_DELAY(1);
}

static void
io_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
{
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, val & 0xff);
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, (val>>8)&0xff);
       AM930_DELAY(1);
}

static void
io_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
{
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,val & 0xff);
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>8)&0xff);
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>16)&0xff);
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>24)&0xff);
       AM930_DELAY(1);
}

static void
io_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
   size_t len)
{
       int i;

       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       for (i=0; i<len; i++)
               bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,ptr[i]);
}

static u_int8_t
io_read_1(struct am79c930_softc *sc, u_int32_t off)
{
       u_int8_t val;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
       AM930_DELAY(1);
       return val;
}

static u_int16_t
io_read_2(struct am79c930_softc *sc, u_int32_t off)
{
       u_int16_t val;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
       AM930_DELAY(1);
       val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
       AM930_DELAY(1);
       return val;
}

static u_int32_t
io_read_4(struct am79c930_softc *sc, u_int32_t off)
{
       u_int32_t val;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
       AM930_DELAY(1);
       val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
       AM930_DELAY(1);
       val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 16;
       AM930_DELAY(1);
       val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 24;
       AM930_DELAY(1);
       return val;
}

static void
io_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
   size_t len)
{
       int i;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
           ((off>>8)& 0x7f));
       AM930_DELAY(1);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
       AM930_DELAY(1);
       for (i=0; i<len; i++)
               ptr[i] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
                   AM79C930_IODPA);
}

static void
mem_write_1(struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
{
       bus_space_write_1(sc->sc_memt, sc->sc_memh, off, val);
}

static void
mem_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
{
       bus_space_tag_t t = sc->sc_memt;
       bus_space_handle_t h = sc->sc_memh;

       /* could be unaligned */
       if ((off & 0x1) == 0)
               bus_space_write_stream_2(t, h, off,    htole16(val));
       else {
               bus_space_write_1(t, h, off,    val        & 0xff);
               bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
       }
}

static void
mem_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
{
       bus_space_tag_t t = sc->sc_memt;
       bus_space_handle_t h = sc->sc_memh;

       /* could be unaligned */
       if ((off & 0x3) == 0)
               bus_space_write_stream_4(t, h, off,    htole32(val));
       else {
               bus_space_write_1(t, h, off,    val        & 0xff);
               bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
               bus_space_write_1(t, h, off+2, (val >> 16) & 0xff);
               bus_space_write_1(t, h, off+3, (val >> 24) & 0xff);
       }
}

static void
mem_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
   size_t len)
{
       bus_space_write_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
}

static u_int8_t
mem_read_1(struct am79c930_softc *sc, u_int32_t off)
{
       return bus_space_read_1(sc->sc_memt, sc->sc_memh, off);
}

static u_int16_t
mem_read_2(struct am79c930_softc *sc, u_int32_t off)
{
       /* could be unaligned */
       if ((off & 0x1) == 0)
               return le16toh(bus_space_read_stream_2(sc->sc_memt,
                   sc->sc_memh, off));
       else
               return
                    bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
                   (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8);
}

static u_int32_t
mem_read_4(struct am79c930_softc *sc, u_int32_t off)
{
       /* could be unaligned */
       if ((off & 0x3) == 0)
               return le32toh(bus_space_read_stream_4(sc->sc_memt, sc->sc_memh,
                   off));
       else
               return
                    bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
                   (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8) |
                   (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+2) <<16) |
                   (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+3) <<24);
}

static void
mem_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
   size_t len)
{
       bus_space_read_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
}


/*
* Set bits in GCR.
*/

void
am79c930_gcr_setbits(struct am79c930_softc *sc, u_int8_t bits)
{
       u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);

       gcr |= bits;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
}

/*
* Clear bits in GCR.
*/

void
am79c930_gcr_clearbits(struct am79c930_softc *sc, u_int8_t bits)
{
       u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);

       gcr &= ~bits;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
}

u_int8_t
am79c930_gcr_read(struct am79c930_softc *sc)
{
       return bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
}

#if 0
void
am79c930_regdump(struct am79c930_softc *sc)
{
       u_int8_t buf[8];
       int i;

       AM930_DELAY(5);
       for (i=0; i<8; i++) {
               buf[i] = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, i);
               AM930_DELAY(5);
       }
       printf("am79c930: regdump:");
       for (i=0; i<8; i++) {
               printf(" %02x", buf[i]);
       }
       printf("\n");
}
#endif

void
am79c930_chip_init(struct am79c930_softc *sc, int how)
{
       /* zero the bank select register, and leave it that way.. */
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_BSS, 0);
       if (how)
               sc->sc_ops = &memspace_ops;
       else
               sc->sc_ops = &iospace_ops;
}

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