/* $NetBSD: bba.c,v 1.44 2019/06/08 08:02:38 isaki Exp $ */
/*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bba.c,v 1.44 2019/06/08 08:02:38 isaki Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/bus.h>
#include <machine/autoconf.h>
#include <sys/cpu.h>
#include <sys/audioio.h>
#include <dev/audio/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>
/* include mulaw.c (not .h file) here to expand mulaw32 */
void audio_mulaw32_to_internal(audio_filter_arg_t *);
void audio_internal_to_mulaw32(audio_filter_arg_t *);
#define MULAW32
#include <dev/audio/mulaw.c>
#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 */
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;
};
static int bba_match(device_t, cfdata_t, void *);
static void bba_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(bba, sizeof(struct bba_softc),
bba_match, bba_attach, NULL, NULL);
/*
* Define our interface into the am7930 MI driver.
*/
static uint8_t bba_codec_iread(struct am7930_softc *, int);
static uint16_t bba_codec_iread16(struct am7930_softc *, int);
static void bba_codec_iwrite(struct am7930_softc *, int, uint8_t);
static void bba_codec_iwrite16(struct am7930_softc *, int, uint16_t);
static void bba_onopen(struct am7930_softc *);
static 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,
};
/*
* Define our interface to the higher level audio driver.
*/
static int bba_query_format(void *, audio_format_query_t *);
static int bba_set_format(void *, int,
const audio_params_t *, const audio_params_t *,
audio_filter_reg_t *, audio_filter_reg_t *);
static int bba_round_blocksize(void *, int, int, const audio_params_t *);
static int bba_halt_output(void *);
static int bba_halt_input(void *);
static int bba_getdev(void *, struct audio_device *);
static void *bba_allocm(void *, int, size_t);
static void bba_freem(void *, void *, size_t);
static size_t bba_round_buffersize(void *, int, size_t);
static int bba_trigger_output(void *, void *, void *, int,
void (*)(void *), void *,
const audio_params_t *);
static int bba_trigger_input(void *, void *, void *, int,
void (*)(void *), void *,
const audio_params_t *);
static void bba_get_locks(void *opaque, kmutex_t **intr,
kmutex_t **thread);
static const struct audio_hw_if sa_hw_if = {
.open = am7930_open,
.close = am7930_close,
.query_format = bba_query_format,
.set_format = bba_set_format,
.round_blocksize = bba_round_blocksize, /* md */
.commit_settings = am7930_commit_settings,
.halt_output = bba_halt_output, /* md */
.halt_input = bba_halt_input, /* md */
.getdev = bba_getdev,
.set_port = am7930_set_port,
.get_port = am7930_get_port,
.query_devinfo = am7930_query_devinfo,
.allocm = bba_allocm, /* md */
.freem = bba_freem, /* md */
.round_buffersize = bba_round_buffersize, /* md */
.get_props = am7930_get_props,
.trigger_output = bba_trigger_output, /* md */
.trigger_input = bba_trigger_input, /* md */
.get_locks = bba_get_locks,
};
static struct audio_device bba_device = {
"am7930",
"x",
"bba"
};
static const struct audio_format bba_format = {
.mode = AUMODE_PLAY | AUMODE_RECORD,
.encoding = AUDIO_ENCODING_ULAW, /* XXX */
.validbits = 32,
.precision = 32,
.channels = 1,
.channel_mask = AUFMT_MONAURAL,
.frequency_type = 1,
.frequency = { 8000 },
};
static int bba_intr(void *);
static void bba_reset(struct bba_softc *, int);
static void bba_codec_dwrite(struct am7930_softc *, int, uint8_t);
static uint8_t bba_codec_dread(struct am7930_softc *, int);
static int
bba_match(device_t parent, cfdata_t cf, void *aux)
{
struct ioasicdev_attach_args *ia;
ia = aux;
if (strcmp(ia->iada_modname, "isdn") != 0 &&
strcmp(ia->iada_modname, "AMD79c30") != 0)
return 0;
return 1;
}
static void
bba_attach(device_t parent, device_t self, void *aux)
{
struct ioasicdev_attach_args *ia;
struct bba_softc *sc;
struct am7930_softc *asc;
struct ioasic_softc *iosc = device_private(parent);
ia = aux;
sc = device_private(self);
asc = &sc->sc_am7930;
asc->sc_dev = self;
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)) {
aprint_error_dev(self, "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.
*/
asc->sc_glue = &bba_glue;
/*
* MI initialisation. We will be doing DMA.
*/
am7930_init(asc, AUDIOAMD_DMA_MODE);
ioasic_intr_establish(parent, ia->iada_cookie, TC_IPL_NONE,
bba_intr, sc);
audio_attach_mi(&sa_hw_if, asc, self);
}
static void
bba_onopen(struct am7930_softc *sc)
{
}
static void
bba_onclose(struct am7930_softc *sc)
{
}
static 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, -1);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, -1);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR, -1);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, -1);
/* 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);
}
}
static void *
bba_allocm(void *addr, int direction, size_t size)
{
struct am7930_softc *asc;
struct bba_softc *sc;
bus_dma_segment_t seg;
int rseg;
void *kva;
struct bba_mem *m;
int state;
DPRINTF(("bba_allocm: size = %zu\n", size));
asc = addr;
sc = addr;
state = 0;
if (bus_dmamem_alloc(sc->sc_dmat, size, BBA_DMABUF_ALIGN,
BBA_DMABUF_BOUNDARY, &seg, 1, &rseg, BUS_DMA_WAITOK)) {
aprint_error_dev(asc->sc_dev, "can't allocate DMA buffer\n");
goto bad;
}
state |= 1;
if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, size,
&kva, BUS_DMA_WAITOK | BUS_DMA_COHERENT)) {
aprint_error_dev(asc->sc_dev, "can't map DMA buffer\n");
goto bad;
}
state |= 2;
m = kmem_alloc(sizeof(struct bba_mem), KM_SLEEP);
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;
}
static void
bba_freem(void *addr, void *ptr, size_t size)
{
struct bba_softc *sc;
struct bba_mem **mp, *m;
bus_dma_segment_t seg;
void *kva;
sc = addr;
kva = (void *)addr;
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);
kmem_free(m, sizeof(struct bba_mem));
}
static size_t
bba_round_buffersize(void *addr, 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);
}
static int
bba_halt_output(void *addr)
{
struct bba_softc *sc;
struct bba_dma_state *d;
uint32_t ssr;
sc = addr;
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, -1);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, -1);
if (d->active) {
bus_dmamap_unload(sc->sc_dmat, d->dmam);
bus_dmamap_destroy(sc->sc_dmat, d->dmam);
d->active = 0;
}
return 0;
}
static int
bba_halt_input(void *addr)
{
struct bba_softc *sc;
struct bba_dma_state *d;
uint32_t ssr;
sc = addr;
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, -1);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, -1);
if (d->active) {
bus_dmamap_unload(sc->sc_dmat, d->dmam);
bus_dmamap_destroy(sc->sc_dmat, d->dmam);
d->active = 0;
}
return 0;
}
static int
bba_getdev(void *addr, struct audio_device *retp)
{
*retp = bba_device;
return 0;
}
static int
bba_trigger_output(void *addr, void *start, void *end, int blksize,
void (*intr)(void *), void *arg,
const audio_params_t *param)
{
struct bba_softc *sc;
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",
addr, start, end, blksize, intr, arg));
sc = addr;
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);
if (bus_dmamap_create(sc->sc_dmat, (char *)end - (char *)start,
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,
(char *)end - (char *)start, NULL, BUS_DMA_WRITE|BUS_DMA_NOWAIT)) {
printf("bba_trigger_output: can't load DMA map\n");
goto bad;
}
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].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 */
ssr |= IOASIC_CSR_DMAEN_ISDN_T;
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
d->active = 1;
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;
}
static int
bba_trigger_input(void *addr, void *start, void *end, int blksize,
void (*intr)(void *), void *arg, const audio_params_t *param)
{
struct bba_softc *sc;
struct bba_dma_state *d;
tc_addr_t phys, nphys;
uint32_t ssr;
int state = 0;
DPRINTF(("bba_trigger_input: sc=%p start=%p end=%p blksize=%d intr=%p(%p)\n",
addr, start, end, blksize, intr, arg));
sc = addr;
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);
if (bus_dmamap_create(sc->sc_dmat, (char *)end - (char *)start,
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,
(char *)end - (char *)start, NULL, BUS_DMA_READ|BUS_DMA_NOWAIT)) {
printf("bba_trigger_input: can't load DMA map\n");
goto bad;
}
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].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 */
ssr |= IOASIC_CSR_DMAEN_ISDN_R;
bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
d->active = 1;
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;
}
static void
bba_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread)
{
struct bba_softc *bsc = opaque;
struct am7930_softc *sc = &bsc->sc_am7930;
*intr = &sc->sc_intr_lock;
*thread = &sc->sc_lock;
}
static int
bba_intr(void *addr)
{
struct bba_softc *sc;
struct bba_dma_state *d;
tc_addr_t nphys;
int mask;
sc = addr;
mutex_enter(&sc->sc_am7930.sc_intr_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);
}
mutex_exit(&sc->sc_am7930.sc_intr_lock);
return 0;
}
static int
bba_query_format(void *addr, audio_format_query_t *afp)
{
return audio_query_format(&bba_format, 1, afp);
}
static int
bba_set_format(void *addr, int setmode,
const audio_params_t *play, const audio_params_t *rec,
audio_filter_reg_t *pfil, audio_filter_reg_t *rfil)
{
if ((setmode & AUMODE_PLAY) != 0) {
pfil->codec = audio_internal_to_mulaw32;
}
if ((setmode & AUMODE_RECORD) != 0) {
rfil->codec = audio_mulaw32_to_internal;
}
return 0;
}
static int
bba_round_blocksize(void *addr, int blk, int mode, const audio_params_t *param)
{
return IOASIC_DMA_BLOCKSIZE;
}
/* indirect write */
static void
bba_codec_iwrite(struct am7930_softc *sc, int reg, uint8_t val)
{
DPRINTF(("bba_codec_iwrite(): sc=%p, reg=%d, val=%d\n", sc, reg, val));
bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
bba_codec_dwrite(sc, AM7930_DREG_DR, val);
}
static void
bba_codec_iwrite16(struct am7930_softc *sc, int reg, uint16_t val)
{
DPRINTF(("bba_codec_iwrite16(): sc=%p, reg=%d, val=%d\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);
}
static uint16_t
bba_codec_iread16(struct am7930_softc *sc, int reg)
{
uint16_t val;
DPRINTF(("bba_codec_iread16(): sc=%p, reg=%d\n", sc, reg));
bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
val = bba_codec_dread(sc, AM7930_DREG_DR) << 8;
val |= bba_codec_dread(sc, AM7930_DREG_DR);
return val;
}
/* indirect read */
static uint8_t
bba_codec_iread(struct am7930_softc *sc, int reg)
{
uint8_t val;
DPRINTF(("bba_codec_iread(): sc=%p, reg=%d\n", sc, reg));
bba_codec_dwrite(sc, AM7930_DREG_CR, reg);
val = bba_codec_dread(sc, AM7930_DREG_DR);
DPRINTF(("read 0x%x (%d)\n", val, val));
return val;
}
/* direct write */
static void
bba_codec_dwrite(struct am7930_softc *asc, int reg, uint8_t val)
{
struct bba_softc *sc;
sc = (struct bba_softc *)asc;
DPRINTF(("bba_codec_dwrite(): sc=%p, reg=%d, val=%d\n", sc, reg, val));
#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 */
static uint8_t
bba_codec_dread(struct am7930_softc *asc, int reg)
{
struct bba_softc *sc;
sc = (struct bba_softc *)asc;
DPRINTF(("bba_codec_dread(): sc=%p, reg=%d\n", sc, reg));
#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
}