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NetBSD/sys/dev/isa/ad1848_isa.c
thorpej 52a2804a5c Add a new function call to the ISA DMA API: isa_dmamaxsize(), which returns 
the maximum transfer size for the specified DMA channel.  Make all clients
of ISA DMA use this call to determine their maximum transfer size.
2000-02-07 22:07:27 +00:00

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/* $NetBSD: ad1848_isa.c,v 1.14 2000/02/07 22:07:30 thorpej Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Ken Hornstein and John Kohl.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/*
* Copyright (c) 1994 John Brezak
* Copyright (c) 1991-1993 Regents of the University of California.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*/
/*
* Copyright by Hannu Savolainen 1994
*
* 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 AUTHOR 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 AUTHOR 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.
*
*/
/*
* Portions of this code are from the VOXware support for the ad1848
* by Hannu Savolainen <hannu@voxware.pp.fi>
*
* Portions also supplied from the SoundBlaster driver for NetBSD.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <machine/cpu.h>
#include <machine/bus.h>
#include <sys/audioio.h>
#include <vm/vm.h>
#include <dev/audio_if.h>
#include <dev/auconv.h>
#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>
#include <dev/ic/ad1848reg.h>
#include <dev/ic/cs4231reg.h>
#include <dev/ic/cs4237reg.h>
#include <dev/isa/ad1848var.h>
#include <dev/isa/cs4231var.h>
#ifdef AUDIO_DEBUG
#define DPRINTF(x) if (ad1848debug) printf x
extern int ad1848debug;
#else
#define DPRINTF(x)
#endif
static int ad1848_isa_read __P(( struct ad1848_softc *, int));
static void ad1848_isa_write __P(( struct ad1848_softc *, int, int));
int
ad1848_isa_read(sc, index)
struct ad1848_softc *sc;
int index;
{
return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, index));
}
void
ad1848_isa_write(sc, index, value)
struct ad1848_softc *sc;
int index;
int value;
{
bus_space_write_1(sc->sc_iot, sc->sc_ioh, index, value);
}
/*
* Map and probe for the ad1848 chip
*/
int
ad1848_isa_mapprobe(isc, iobase)
struct ad1848_isa_softc *isc;
int iobase;
{
struct ad1848_softc *sc = &isc->sc_ad1848;
if (!AD1848_BASE_VALID(iobase)) {
#ifdef AUDIO_DEBUG
printf("ad1848: configured iobase %04x invalid\n", iobase);
#endif
return 0;
}
/* Map the AD1848 ports */
if (bus_space_map(sc->sc_iot, iobase, AD1848_NPORT, 0, &sc->sc_ioh))
return 0;
if (!ad1848_isa_probe(isc)) {
bus_space_unmap(sc->sc_iot, sc->sc_ioh, AD1848_NPORT);
return 0;
} else
return 1;
}
/*
* Probe for the ad1848 chip
*/
int
ad1848_isa_probe(isc)
struct ad1848_isa_softc *isc;
{
struct ad1848_softc *sc = &isc->sc_ad1848;
u_char tmp, tmp1 = 0xff, tmp2 = 0xff;
int i;
sc->sc_readreg = ad1848_isa_read;
sc->sc_writereg = ad1848_isa_write;
/* Is there an ad1848 chip ? */
sc->MCE_bit = MODE_CHANGE_ENABLE;
sc->mode = 1; /* MODE 1 = original ad1848/ad1846/cs4248 */
/*
* Check that the I/O address is in use.
*
* The SP_IN_INIT bit of the base I/O port is known to be 0 after the
* chip has performed its power-on initialization. Just assume
* this has happened before the OS is starting.
*
* If the I/O address is unused, inb() typically returns 0xff.
*/
tmp = ADREAD(sc, AD1848_IADDR);
if (tmp & SP_IN_INIT) { /* Not a AD1848 */
DPRINTF(("ad_detect_A %x\n", tmp));
goto bad;
}
/*
* Test if it's possible to change contents of the indirect registers.
* Registers 0 and 1 are ADC volume registers. The bit 0x10 is read
* only so try to avoid using it. The bit 0x20 is the mic preamp
* enable; on some chips it is always the same in both registers, so
* we avoid tests where they are different.
*/
ad_write(sc, 0, 0x8a);
ad_write(sc, 1, 0x45); /* 0x55 with bit 0x10 clear */
tmp1 = ad_read(sc, 0);
tmp2 = ad_read(sc, 1);
if (tmp1 != 0x8a || tmp2 != 0x45) {
DPRINTF(("ad_detect_B (%x/%x)\n", tmp1, tmp2));
goto bad;
}
ad_write(sc, 0, 0x65);
ad_write(sc, 1, 0xaa);
tmp1 = ad_read(sc, 0);
tmp2 = ad_read(sc, 1);
if (tmp1 != 0x65 || tmp2 != 0xaa) {
DPRINTF(("ad_detect_C (%x/%x)\n", tmp1, tmp2));
goto bad;
}
/*
* The indirect register I12 has some read only bits. Lets
* try to change them.
*/
tmp = ad_read(sc, SP_MISC_INFO);
ad_write(sc, SP_MISC_INFO, (~tmp) & 0x0f);
if ((tmp & 0x0f) != ((tmp1 = ad_read(sc, SP_MISC_INFO)) & 0x0f)) {
DPRINTF(("ad_detect_D (%x)\n", tmp1));
goto bad;
}
/*
* MSB and 4 LSBs of the reg I12 tell the chip revision.
*
* A preliminary version of the AD1846 data sheet stated that it
* used an ID field of 0x0B. The current version, however,
* states that the AD1846 uses ID 0x0A, just like the AD1848K.
*
* this switch statement will need updating as newer clones arrive....
*/
switch (tmp1 & 0x8f) {
case 0x09:
sc->chip_name = "AD1848J";
break;
case 0x0A:
sc->chip_name = "AD1848K";
break;
#if 0 /* See above */
case 0x0B:
sc->chip_name = "AD1846";
break;
#endif
case 0x81:
sc->chip_name = "CS4248revB"; /* or CS4231 rev B; see below */
break;
case 0x89:
sc->chip_name = "CS4248";
break;
case 0x8A:
sc->chip_name = "broken"; /* CS4231/AD1845; see below */
break;
default:
sc->chip_name = "unknown";
DPRINTF(("ad1848: unknown codec version 0x%02x\n",
tmp1 & 0x8f));
break;
}
/*
* The original AD1848/CS4248 has just 16 indirect registers. This
* means that I0 and I16 should return the same value (etc.).
* Ensure that the Mode2 enable bit of I12 is 0. Otherwise this test
* fails with CS4231, AD1845, etc.
*/
ad_write(sc, SP_MISC_INFO, 0); /* Mode2 = disabled */
for (i = 0; i < 16; i++)
if ((tmp1 = ad_read(sc, i)) != (tmp2 = ad_read(sc, i + 16))) {
if (i != SP_TEST_AND_INIT) {
DPRINTF(("ad_detect_F(%d/%x/%x)\n", i, tmp1, tmp2));
goto bad;
}
}
/*
* Try to switch the chip to mode2 (CS4231) by setting the MODE2 bit
* The bit 0x80 is always 1 in CS4248, CS4231, and AD1845.
*/
ad_write(sc, SP_MISC_INFO, MODE2); /* Set mode2, clear 0x80 */
tmp1 = ad_read(sc, SP_MISC_INFO);
if ((tmp1 & 0xc0) == (0x80 | MODE2)) {
/*
* CS4231 or AD1845 detected - is it?
*
* Verify that setting I2 doesn't change I18.
*/
ad_write(sc, 18, 0x88); /* Set I18 to known value */
ad_write(sc, 2, 0x45);
if ((tmp2 = ad_read(sc, 18)) != 0x45) { /* No change -> CS4231? */
ad_write(sc, 2, 0xaa);
if ((tmp2 = ad_read(sc, 18)) == 0xaa) { /* Rotten bits? */
DPRINTF(("ad_detect_H(%x)\n", tmp2));
goto bad;
}
sc->mode = 2;
/*
* It's a CS4231, or another clone with 32 registers.
* Let's find out which by checking I25.
*/
if ((tmp1 & 0x8f) == 0x8a) {
tmp1 = ad_read(sc, CS_VERSION_ID);
switch (tmp1 & 0xe7) {
case 0xA0:
sc->chip_name = "CS4231A";
break;
case 0x80:
/* XXX I25 no good, AD1845 same as CS4231 */
sc->chip_name = "CS4231 or AD1845";
break;
case 0x82:
sc->chip_name = "CS4232";
break;
case 0x03:
case 0x83:
sc->chip_name = "CS4236";
/*
* Try to switch to mode3 (CS4236B or
* CS4237B) by setting CMS to 3. A
* plain CS4236 will not react to
* LLBM settings.
*/
ad_write(sc, SP_MISC_INFO, MODE3);
tmp1 = ad_read(sc, CS_LEFT_LINE_CONTROL);
ad_write(sc, CS_LEFT_LINE_CONTROL, 0xe0);
tmp2 = ad_read(sc, CS_LEFT_LINE_CONTROL);
if (tmp2 == 0xe0) {
/*
* it's a CS4237B or another
* clone supporting mode 3.
* Let's determine which by
* enabling extended registers
* and checking X25.
*/
tmp2 = ad_xread(sc, CS_X_CHIP_VERSION);
switch (tmp2 & X_CHIP_VERSIONF_CID) {
case X_CHIP_CID_CS4236BB:
sc->chip_name = "CS4236BrevB";
break;
case X_CHIP_CID_CS4236B:
sc->chip_name = "CS4236B";
break;
case X_CHIP_CID_CS4237B:
sc->chip_name = "CS4237B";
break;
default:
sc->chip_name = "CS4236B compatible";
DPRINTF(("cs4236: unknown mode 3 compatible codec, version 0x%02x\n", tmp2));
break;
}
sc->mode = 3;
}
/* restore volume control information */
ad_write(sc, CS_LEFT_LINE_CONTROL, tmp1);
break;
}
}
}
}
/* Wait for 1848 to init */
while(ADREAD(sc, AD1848_IADDR) & SP_IN_INIT)
;
/* Wait for 1848 to autocal */
ADWRITE(sc, AD1848_IADDR, SP_TEST_AND_INIT);
while(ADREAD(sc, AD1848_IDATA) & AUTO_CAL_IN_PROG)
;
return 1;
bad:
return 0;
}
/* Unmap the I/O ports */
void
ad1848_isa_unmap(isc)
struct ad1848_isa_softc *isc;
{
struct ad1848_softc *sc = &isc->sc_ad1848;
bus_space_unmap(sc->sc_iot, sc->sc_ioh, AD1848_NPORT);
}
/*
* Attach hardware to driver, attach hardware driver to audio
* pseudo-device driver .
*/
void
ad1848_isa_attach(isc)
struct ad1848_isa_softc *isc;
{
struct ad1848_softc *sc = &isc->sc_ad1848;
sc->sc_readreg = ad1848_isa_read;
sc->sc_writereg = ad1848_isa_write;
if (isc->sc_playdrq != -1)
isc->sc_play_maxsize = isa_dmamaxsize(isc->sc_ic,
isc->sc_playdrq);
if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq)
isc->sc_rec_maxsize = isa_dmamaxsize(isc->sc_ic,
isc->sc_recdrq);
ad1848_attach(sc);
}
int
ad1848_isa_open(addr, flags)
void *addr;
int flags;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
int error, state;
DPRINTF(("ad1848_isa_open: sc=%p\n", isc));
state = 0;
if (isc->sc_playdrq != -1) {
error = isa_dmamap_create(isc->sc_ic, isc->sc_playdrq,
isc->sc_play_maxsize, BUS_DMA_NOWAIT);
if (error) {
printf("%s: can't create map for drq %d\n",
sc->sc_dev.dv_xname, isc->sc_playdrq);
goto bad;
}
state |= 1;
}
if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq) {
error = isa_dmamap_create(isc->sc_ic, isc->sc_recdrq,
isc->sc_rec_maxsize, BUS_DMA_NOWAIT);
if (error) {
printf("%s: can't create map for drq %d\n",
sc->sc_dev.dv_xname, isc->sc_recdrq);
goto bad;
}
state |= 2;
}
#ifndef AUDIO_NO_POWER_CTL
/* Power-up chip */
if (isc->powerctl)
isc->powerctl(isc->powerarg, flags);
#endif
/* Init and mute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2_INIT, 1);
error = ad1848_open(sc, flags);
if (error) {
#ifndef AUDIO_NO_POWER_CTL
if (isc->powerctl)
isc->powerctl(isc->powerarg, 0);
#endif
goto bad;
}
DPRINTF(("ad1848_isa_open: opened\n"));
return (0);
bad:
if (state & 1)
isa_dmamap_destroy(isc->sc_ic, isc->sc_playdrq);
if (state & 2)
isa_dmamap_destroy(isc->sc_ic, isc->sc_recdrq);
return (error);
}
/*
* Close function is called at splaudio().
*/
void
ad1848_isa_close(addr)
void *addr;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
ad1848_isa_halt_output(isc);
ad1848_isa_halt_input(isc);
isc->sc_intr = 0;
if (isc->sc_playdrq != -1)
isa_dmamap_destroy(isc->sc_ic, isc->sc_playdrq);
if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq)
isa_dmamap_destroy(isc->sc_ic, isc->sc_recdrq);
DPRINTF(("ad1848_isa_close: stop DMA\n"));
ad1848_close(sc);
#ifndef AUDIO_NO_POWER_CTL
/* Power-down chip */
if (isc->powerctl)
isc->powerctl(isc->powerarg, 0);
#endif
}
int
ad1848_isa_trigger_input(addr, start, end, blksize, intr, arg, param)
void *addr;
void *start, *end;
int blksize;
void (*intr) __P((void *));
void *arg;
struct audio_params *param;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
u_int8_t reg;
isa_dmastart(isc->sc_ic, isc->sc_recdrq, start,
(char *)end - (char *)start, NULL,
DMAMODE_READ | DMAMODE_LOOPDEMAND, BUS_DMA_NOWAIT);
isc->sc_recrun = 1;
isc->sc_intr = intr;
isc->sc_arg = arg;
blksize = (blksize * 8) / (param->precision * param->factor * param->channels) - 1;
if (sc->mode >= 2) {
ad_write(sc, CS_LOWER_REC_CNT, blksize & 0xff);
ad_write(sc, CS_UPPER_REC_CNT, blksize >> 8);
} else {
ad_write(sc, SP_LOWER_BASE_COUNT, blksize & 0xff);
ad_write(sc, SP_UPPER_BASE_COUNT, blksize >> 8);
}
reg = ad_read(sc, SP_INTERFACE_CONFIG);
ad_write(sc, SP_INTERFACE_CONFIG, CAPTURE_ENABLE|reg);
return (0);
}
int
ad1848_isa_trigger_output(addr, start, end, blksize, intr, arg, param)
void *addr;
void *start, *end;
int blksize;
void (*intr) __P((void *));
void *arg;
struct audio_params *param;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
u_int8_t reg;
isa_dmastart(isc->sc_ic, isc->sc_playdrq, start,
(char *)end - (char *)start, NULL,
DMAMODE_WRITE | DMAMODE_LOOPDEMAND, BUS_DMA_NOWAIT);
isc->sc_playrun = 1;
isc->sc_intr = intr;
isc->sc_arg = arg;
blksize = (blksize * 8) / (param->precision * param->factor * param->channels) - 1;
ad_write(sc, SP_LOWER_BASE_COUNT, blksize & 0xff);
ad_write(sc, SP_UPPER_BASE_COUNT, blksize >> 8);
/* Unmute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2, 0);
reg = ad_read(sc, SP_INTERFACE_CONFIG);
ad_write(sc, SP_INTERFACE_CONFIG, PLAYBACK_ENABLE|reg);
return (0);
}
int
ad1848_isa_halt_input(addr)
void *addr;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
if (isc->sc_recrun) {
ad1848_halt_input(sc);
isa_dmaabort(isc->sc_ic, isc->sc_recdrq);
isc->sc_recrun = 0;
}
return (0);
}
int
ad1848_isa_halt_output(addr)
void *addr;
{
struct ad1848_isa_softc *isc = addr;
struct ad1848_softc *sc = &isc->sc_ad1848;
if (isc->sc_playrun) {
/* Mute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2, 1);
ad1848_halt_output(sc);
isa_dmaabort(isc->sc_ic, isc->sc_playdrq);
isc->sc_playrun = 0;
}
return (0);
}
int
ad1848_isa_intr(arg)
void *arg;
{
struct ad1848_isa_softc *isc = arg;
struct ad1848_softc *sc = &isc->sc_ad1848;
int retval = 0;
u_char status;
/* Get intr status */
status = ADREAD(sc, AD1848_STATUS);
#ifdef AUDIO_DEBUG
if (ad1848debug > 1)
printf("ad1848_isa_intr: intr=%p status=%x\n", isc->sc_intr, status);
#endif
isc->sc_interrupts++;
/* Handle interrupt */
if (isc->sc_intr && (status & INTERRUPT_STATUS)) {
(*isc->sc_intr)(isc->sc_arg);
retval = 1;
}
/* clear interrupt */
if (status & INTERRUPT_STATUS)
ADWRITE(sc, AD1848_STATUS, 0);
return(retval);
}
void *
ad1848_isa_malloc(addr, direction, size, pool, flags)
void *addr;
int direction;
size_t size;
int pool, flags;
{
struct ad1848_isa_softc *isc = addr;
int drq;
if (direction == AUMODE_PLAY)
drq = isc->sc_playdrq;
else
drq = isc->sc_recdrq;
return (isa_malloc(isc->sc_ic, drq, size, pool, flags));
}
void
ad1848_isa_free(addr, ptr, pool)
void *addr;
void *ptr;
int pool;
{
isa_free(ptr, pool);
}
size_t
ad1848_isa_round_buffersize(addr, direction, size)
void *addr;
int direction;
size_t size;
{
struct ad1848_isa_softc *isc = addr;
bus_size_t maxsize;
if (direction == AUMODE_PLAY)
maxsize = isc->sc_play_maxsize;
else if (isc->sc_recdrq == isc->sc_playdrq)
maxsize = isc->sc_play_maxsize;
else
maxsize = isc->sc_rec_maxsize;
if (size > maxsize)
size = maxsize;
return (size);
}
int
ad1848_isa_mappage(addr, mem, off, prot)
void *addr;
void *mem;
int off;
int prot;
{
return isa_mappage(mem, off, prot);
}
int
ad1848_isa_get_props(addr)
void *addr;
{
struct ad1848_isa_softc *isc = addr;
return (AUDIO_PROP_MMAP |
(isc->sc_playdrq != isc->sc_recdrq ? AUDIO_PROP_FULLDUPLEX : 0));
}
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