/*      $OpenBSD: bba.c,v 1.12 2022/10/26 20:19:09 kn Exp $     */
/* $NetBSD: bba.c,v 1.38 2011/06/04 01:27:57 tsutsui Exp $ */
/*
 * Copyright (c) 2011 Miodrag Vallat.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * 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.
 */

/* maxine/alpha baseboard audio (bba) */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>

#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/cpu.h>

#include <sys/audioio.h>
#include <dev/audio_if.h>

#include <dev/ic/am7930reg.h>
#include <dev/ic/am7930var.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicreg.h>
#include <dev/tc/ioasicvar.h>

#ifdef AUDIO_DEBUG
#define DPRINTF(x)      if (am7930debug) printf x
#else
#define DPRINTF(x)
#endif  /* AUDIO_DEBUG */

#define BBA_MAX_DMA_SEGMENTS    16
#define BBA_DMABUF_SIZE         (BBA_MAX_DMA_SEGMENTS*IOASIC_DMA_BLOCKSIZE)
#define BBA_DMABUF_ALIGN        IOASIC_DMA_BLOCKSIZE
#define BBA_DMABUF_BOUNDARY     0

struct bba_mem {
        struct bba_mem *next;
        bus_addr_t addr;
        bus_size_t size;
        void *kva;
};

struct bba_dma_state {
        bus_dmamap_t dmam;              /* DMA map */
        size_t size;
        int active;
        int curseg;                     /* current segment in DMA buffer */
        void (*intr)(void *);           /* higher-level audio handler */
        void *intr_arg;
};

struct bba_softc {
        struct am7930_softc sc_am7930;          /* glue to MI code */

        bus_space_tag_t sc_bst;                 /* IOASIC bus tag/handle */
        bus_space_handle_t sc_bsh;
        bus_dma_tag_t sc_dmat;
        bus_space_handle_t sc_codec_bsh;        /* codec bus space handle */

        struct bba_mem *sc_mem_head;            /* list of buffers */

        struct bba_dma_state sc_tx_dma_state;
        struct bba_dma_state sc_rx_dma_state;
};

int     bba_match(struct device *, void *, void *);
void    bba_attach(struct device *, struct device *, void *);

struct cfdriver bba_cd = {
        NULL, "bba", DV_DULL
};

const struct cfattach bba_ca = {
        sizeof(struct bba_softc), bba_match, bba_attach
};

/*
 * Define our interface into the am7930 MI driver.
 */

uint8_t  bba_codec_iread(struct am7930_softc *, int);
uint16_t bba_codec_iread16(struct am7930_softc *, int);
void     bba_codec_iwrite(struct am7930_softc *, int, uint8_t);
void     bba_codec_iwrite16(struct am7930_softc *, int, uint16_t);
void     bba_onopen(struct am7930_softc *);
void     bba_onclose(struct am7930_softc *);

struct am7930_glue bba_glue = {
        bba_codec_iread,
        bba_codec_iwrite,
        bba_codec_iread16,
        bba_codec_iwrite16,
        bba_onopen,
        bba_onclose,
        24
};

/*
 * Define our interface to the higher level audio driver.
 */

int     bba_round_blocksize(void *, int);
int     bba_halt_output(void *);
int     bba_halt_input(void *);
void    *bba_allocm(void *, int, size_t, int, int);
void    bba_freem(void *, void *, int);
size_t  bba_round_buffersize(void *, int, size_t);
int     bba_trigger_output(void *, void *, void *, int,
            void (*)(void *), void *, struct audio_params *);
int     bba_trigger_input(void *, void *, void *, int,
            void (*)(void *), void *, struct audio_params *);

const struct audio_hw_if bba_hw_if = {
        .open = am7930_open,
        .close = am7930_close,
        .set_params = am7930_set_params,
        .round_blocksize = bba_round_blocksize,
        .commit_settings = am7930_commit_settings,
        .halt_output = bba_halt_output,
        .halt_input = bba_halt_input,
        .set_port = am7930_set_port,
        .get_port = am7930_get_port,
        .query_devinfo = am7930_query_devinfo,
        .allocm = bba_allocm,
        .freem = bba_freem,
        .round_buffersize = bba_round_buffersize,
        .trigger_output = bba_trigger_output,
        .trigger_input = bba_trigger_input,
};

int     bba_intr(void *);
void    bba_reset(struct bba_softc *, int);
void    bba_codec_dwrite(struct am7930_softc *, int, uint8_t);
uint8_t bba_codec_dread(struct am7930_softc *, int);

int
bba_match(struct device *parent, void *vcf, void *aux)
{
        struct ioasicdev_attach_args *ia = aux;

        if (strcmp(ia->iada_modname, "isdn") != 0 &&
            strcmp(ia->iada_modname, "AMD79c30") != 0)
                return 0;

        return 1;
}

void
bba_attach(struct device *parent, struct device *self, void *aux)
{
        struct ioasicdev_attach_args *ia = aux;
        struct bba_softc *sc = (struct bba_softc *)self;
        struct ioasic_softc *iosc = (struct ioasic_softc *)parent;

        sc->sc_bst = iosc->sc_bst;
        sc->sc_bsh = iosc->sc_bsh;
        sc->sc_dmat = iosc->sc_dmat;

        /* get the bus space handle for codec */
        if (bus_space_subregion(sc->sc_bst, sc->sc_bsh,
            ia->iada_offset, 0, &sc->sc_codec_bsh)) {
                printf(": unable to map device\n");
                return;
        }

        printf("\n");

        bba_reset(sc,1);

        /*
         * Set up glue for MI code early; we use some of it here.
         */
        sc->sc_am7930.sc_glue = &bba_glue;

        /*
         *  MI initialisation.  We will be doing DMA.
         */
        am7930_init(&sc->sc_am7930, AUDIOAMD_DMA_MODE);

        ioasic_intr_establish(parent, ia->iada_cookie, IPL_AUDIO,
            bba_intr, sc, self->dv_xname);

        audio_attach_mi(&bba_hw_if, sc, NULL, self);
}

void
bba_onopen(struct am7930_softc *sc)
{
}

void
bba_onclose(struct am7930_softc *sc)
{
}

void
bba_reset(struct bba_softc *sc, int reset)
{
        uint32_t ssr;

        /* disable any DMA and reset the codec */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~(IOASIC_CSR_DMAEN_ISDN_T | IOASIC_CSR_DMAEN_ISDN_R);
        if (reset)
                ssr &= ~IOASIC_CSR_ISDN_ENABLE;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        DELAY(10);      /* 400ns required for codec to reset */

        /* initialise DMA pointers */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR, 0);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, 0);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR, 0);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, 0);

        /* take out of reset state */
        if (reset) {
                ssr |= IOASIC_CSR_ISDN_ENABLE;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        }

}

void *
bba_allocm(void *v, int direction, size_t size, int mtype, int flags)
{
        struct bba_softc *sc = v;
        bus_dma_segment_t seg;
        int rseg;
        caddr_t kva;
        struct bba_mem *m;
        int w;
        int state;

        DPRINTF(("bba_allocm: size = %zu\n", size));
        state = 0;
        w = (flags & M_NOWAIT) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK;

        if (bus_dmamem_alloc(sc->sc_dmat, size, BBA_DMABUF_ALIGN,
            BBA_DMABUF_BOUNDARY, &seg, 1, &rseg, w)) {
                printf("%s: can't allocate DMA buffer\n",
                    sc->sc_am7930.sc_dev.dv_xname);
                goto bad;
        }
        state |= 1;

        if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, size,
            &kva, w | BUS_DMA_COHERENT)) {
                printf("%s: can't map DMA buffer\n",
                    sc->sc_am7930.sc_dev.dv_xname);
                goto bad;
        }
        state |= 2;

        m = malloc(sizeof(struct bba_mem), mtype, flags | M_CANFAIL);
        if (m == NULL)
                goto bad;
        m->addr = seg.ds_addr;
        m->size = seg.ds_len;
        m->kva = kva;
        m->next = sc->sc_mem_head;
        sc->sc_mem_head = m;

        return (void *)kva;

bad:
        if (state & 2)
                bus_dmamem_unmap(sc->sc_dmat, kva, size);
        if (state & 1)
                bus_dmamem_free(sc->sc_dmat, &seg, 1);
        return NULL;
}

void
bba_freem(void *v, void *ptr, int mtype)
{
        struct bba_softc *sc = v;
        struct bba_mem **mp, *m;
        bus_dma_segment_t seg;
        void *kva;

        kva = (void *)ptr;
        for (mp = &sc->sc_mem_head; *mp && (*mp)->kva != kva; mp = &(*mp)->next)
                continue;
        m = *mp;
        if (m == NULL) {
                printf("bba_freem: freeing unallocated memory\n");
                return;
        }
        *mp = m->next;
        bus_dmamem_unmap(sc->sc_dmat, kva, m->size);

        seg.ds_addr = m->addr;
        seg.ds_len = m->size;
        bus_dmamem_free(sc->sc_dmat, &seg, 1);
        free(m, mtype, 0);
}

size_t
bba_round_buffersize(void *v, int direction, size_t size)
{

        DPRINTF(("bba_round_buffersize: size=%zu\n", size));
        return size > BBA_DMABUF_SIZE ? BBA_DMABUF_SIZE :
            roundup(size, IOASIC_DMA_BLOCKSIZE);
}

int
bba_halt_output(void *v)
{
        struct bba_softc *sc = v;
        struct bba_dma_state *d;
        uint32_t ssr;

        mtx_enter(&audio_lock);
        d = &sc->sc_tx_dma_state;
        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR, 0);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, 0);
        mtx_leave(&audio_lock);

        if (d->active) {
                bus_dmamap_sync(sc->sc_dmat, d->dmam, 0, d->size,
                    BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
                d->active = 0;
        }

        return 0;
}

int
bba_halt_input(void *v)
{
        struct bba_softc *sc = v;
        struct bba_dma_state *d;
        uint32_t ssr;

        mtx_enter(&audio_lock);
        d = &sc->sc_rx_dma_state;
        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR, 0);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, 0);
        mtx_leave(&audio_lock);

        if (d->active) {
                bus_dmamap_sync(sc->sc_dmat, d->dmam, 0, d->size,
                    BUS_DMASYNC_POSTREAD);
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
                d->active = 0;
        }

        return 0;
}

int
bba_trigger_output(void *v, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, struct audio_params *param)
{
        struct bba_softc *sc = v;
        struct bba_dma_state *d;
        uint32_t ssr;
        tc_addr_t phys, nphys;
        int state;

        DPRINTF(("bba_trigger_output: sc=%p start=%p end=%p blksize=%d intr=%p(%p)\n",
            sc, start, end, blksize, intr, arg));
        d = &sc->sc_tx_dma_state;
        state = 0;

        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->size = (vaddr_t)end - (vaddr_t)start;
        if (bus_dmamap_create(sc->sc_dmat, d->size,
            BBA_MAX_DMA_SEGMENTS, IOASIC_DMA_BLOCKSIZE,
            BBA_DMABUF_BOUNDARY, BUS_DMA_NOWAIT, &d->dmam)) {
                printf("bba_trigger_output: can't create DMA map\n");
                goto bad;
        }
        state |= 1;

        if (bus_dmamap_load(sc->sc_dmat, d->dmam, start, d->size, NULL,
            BUS_DMA_WRITE | BUS_DMA_NOWAIT)) {
                printf("bba_trigger_output: can't load DMA map\n");
                goto bad;
        }
        bus_dmamap_sync(sc->sc_dmat, d->dmam, 0, d->size, BUS_DMASYNC_PREWRITE);
        state |= 2;

        d->intr = intr;
        d->intr_arg = arg;
        d->curseg = 1;

        /* get physical address of buffer start */
        phys = (tc_addr_t)d->dmam->dm_segs[0].ds_addr;
        nphys = (tc_addr_t)d->dmam->dm_segs[1 % d->dmam->dm_nsegs].ds_addr;

        /* setup DMA pointer */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR,
            IOASIC_DMA_ADDR(phys));
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR,
            IOASIC_DMA_ADDR(nphys));

        /* kick off DMA */
        mtx_enter(&audio_lock);
        ssr |= IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->active = 1;
        mtx_leave(&audio_lock);
        return 0;

bad:
        if (state & 2)
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
        if (state & 1)
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
        return 1;
}

int
bba_trigger_input(void *v, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, struct audio_params *param)
{
        struct bba_softc *sc = v;
        struct bba_dma_state *d;
        uint32_t ssr;
        tc_addr_t phys, nphys;
        int state;

        DPRINTF(("bba_trigger_input: sc=%p start=%p end=%p blksize=%d intr=%p(%p)\n",
            sc, start, end, blksize, intr, arg));
        d = &sc->sc_rx_dma_state;
        state = 0;

        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->size = (vaddr_t)end - (vaddr_t)start;
        if (bus_dmamap_create(sc->sc_dmat, d->size,
            BBA_MAX_DMA_SEGMENTS, IOASIC_DMA_BLOCKSIZE,
            BBA_DMABUF_BOUNDARY, BUS_DMA_NOWAIT, &d->dmam)) {
                printf("bba_trigger_input: can't create DMA map\n");
                goto bad;
        }
        state |= 1;

        if (bus_dmamap_load(sc->sc_dmat, d->dmam, start, d->size, NULL,
            BUS_DMA_READ | BUS_DMA_NOWAIT)) {
                printf("bba_trigger_input: can't load DMA map\n");
                goto bad;
        }
        bus_dmamap_sync(sc->sc_dmat, d->dmam, 0, d->size, BUS_DMASYNC_PREREAD);
        state |= 2;

        d->intr = intr;
        d->intr_arg = arg;
        d->curseg = 1;

        /* get physical address of buffer start */
        phys = (tc_addr_t)d->dmam->dm_segs[0].ds_addr;
        nphys = (tc_addr_t)d->dmam->dm_segs[1 % d->dmam->dm_nsegs].ds_addr;

        /* setup DMA pointer */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR,
            IOASIC_DMA_ADDR(phys));
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR,
            IOASIC_DMA_ADDR(nphys));

        /* kick off DMA */
        mtx_enter(&audio_lock);
        ssr |= IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->active = 1;
        mtx_leave(&audio_lock);
        return 0;

bad:
        if (state & 2)
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
        if (state & 1)
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
        return 1;
}

int
bba_intr(void *v)
{
        struct bba_softc *sc = v;
        struct bba_dma_state *d;
        tc_addr_t nphys;
        int mask;

        mtx_enter(&audio_lock);

        mask = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_INTR);

        if (mask & IOASIC_INTR_ISDN_TXLOAD) {
                d = &sc->sc_tx_dma_state;
                d->curseg = (d->curseg+1) % d->dmam->dm_nsegs;
                nphys = (tc_addr_t)d->dmam->dm_segs[d->curseg].ds_addr;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh,
                    IOASIC_ISDN_X_NEXTPTR, IOASIC_DMA_ADDR(nphys));
                if (d->intr != NULL)
                        (*d->intr)(d->intr_arg);
        }
        if (mask & IOASIC_INTR_ISDN_RXLOAD) {
                d = &sc->sc_rx_dma_state;
                d->curseg = (d->curseg+1) % d->dmam->dm_nsegs;
                nphys = (tc_addr_t)d->dmam->dm_segs[d->curseg].ds_addr;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh,
                    IOASIC_ISDN_R_NEXTPTR, IOASIC_DMA_ADDR(nphys));
                if (d->intr != NULL)
                        (*d->intr)(d->intr_arg);
        }

        mtx_leave(&audio_lock);

        return 0;
}

int
bba_round_blocksize(void *v, int blk)
{
        return IOASIC_DMA_BLOCKSIZE;
}


/* indirect write */
void
bba_codec_iwrite(struct am7930_softc *sc, int reg, uint8_t val)
{
        DPRINTF(("bba_codec_iwrite(): sc=%p, reg=%02x, val=%02x\n", sc, reg, val));
        bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
        bba_codec_dwrite(sc, AM7930_DREG_DR, val);
}


void
bba_codec_iwrite16(struct am7930_softc *sc, int reg, uint16_t val)
{
        DPRINTF(("bba_codec_iwrite16(): sc=%p, reg=%02x, val=%04x\n", sc, reg, val));
        bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
        bba_codec_dwrite(sc, AM7930_DREG_DR, val);
        bba_codec_dwrite(sc, AM7930_DREG_DR, val >> 8);
}


/* indirect read */
uint8_t
bba_codec_iread(struct am7930_softc *sc, int reg)
{
        uint8_t val;

        DPRINTF(("bba_codec_iread(): sc=%p, reg=%02x\n", sc, reg));
        bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
        val = bba_codec_dread(sc, AM7930_DREG_DR);

        DPRINTF(("read 0x%02x (%d)\n", val, val));

        return val;
}

uint16_t
bba_codec_iread16(struct am7930_softc *sc, int reg)
{
        uint16_t val;

        DPRINTF(("bba_codec_iread16(): sc=%p, reg=%02x\n", sc, reg));
        bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
        val = bba_codec_dread(sc, AM7930_DREG_DR);
        val |= bba_codec_dread(sc, AM7930_DREG_DR) << 8;

        return val;
}


/* direct write */
void
bba_codec_dwrite(struct am7930_softc *asc, int reg, uint8_t val)
{
        struct bba_softc *sc = (struct bba_softc *)asc;

#if defined(__alpha__)
        bus_space_write_4(sc->sc_bst, sc->sc_codec_bsh, reg << 2, val << 8);
#else
        bus_space_write_4(sc->sc_bst, sc->sc_codec_bsh, reg << 6, val);
#endif
}

/* direct read */
uint8_t
bba_codec_dread(struct am7930_softc *asc, int reg)
{
        struct bba_softc *sc = (struct bba_softc *)asc;

#if defined(__alpha__)
        return (bus_space_read_4(sc->sc_bst, sc->sc_codec_bsh, reg << 2) >> 8) &
            0xff;
#else
        return bus_space_read_4(sc->sc_bst, sc->sc_codec_bsh, reg << 6) & 0xff;
#endif
}