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freebsd-dev/sys/dev/sound/pci/via82c686.c
Cameron Grant 66ef8af5b0 mega-commit. 
this introduces a new buffering mechanism which results in dramatic
simplification of the channel manager.

as several structures have changed, we take the opportunity to move their
definitions into the source files where they are used, make them private and
de-typedef them.

the sound drivers are updated to use snd_setup_intr instead of
bus_setup_intr, and to comply with the de-typedefed structures.

the ac97, mixer and channel layers have been updated with finegrained
locking, as have some drivers- not all though.  the rest will follow soon.
2001-03-24 23:10:29 +00:00

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/*
* Copyright (c) 2000 David Jones <dej@ox.org>
* 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 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.
*
* $FreeBSD$
*/
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/ac97.h>
#include <pci/pcireg.h>
#include <pci/pcivar.h>
#include <sys/sysctl.h>
#include <dev/sound/pci/via82c686.h>
#define VIA_PCI_ID 0x30581106
#define NSEGS 4 /* Number of segments in SGD table */
#define SEGS_PER_CHAN (NSEGS/2)
#define TIMEOUT 50
#define VIA_BUFFSIZE 0x1000
#undef DEB
#define DEB(x)
/* we rely on this struct being packed to 64 bits */
struct via_dma_op {
u_int32_t ptr;
u_int32_t flags;
#define VIA_DMAOP_EOL 0x80000000
#define VIA_DMAOP_FLAG 0x40000000
#define VIA_DMAOP_STOP 0x20000000
#define VIA_DMAOP_COUNT(x) ((x)&0x00FFFFFF)
};
struct via_info;
struct via_chinfo {
struct via_info *parent;
struct pcm_channel *channel;
struct snd_dbuf *buffer;
struct via_dma_op *sgd_table;
int dir, blksz;
int base, count, mode, ctrl;
};
struct via_info {
bus_space_tag_t st;
bus_space_handle_t sh;
bus_dma_tag_t parent_dmat;
bus_dma_tag_t sgd_dmat;
bus_dmamap_t sgd_dmamap;
struct resource *reg, *irq;
int regid, irqid;
void *ih;
struct ac97_info *codec;
struct via_chinfo pch, rch;
struct via_dma_op *sgd_table;
u_int16_t codec_caps;
};
static u_int32_t via_fmt[] = {
AFMT_U8,
AFMT_STEREO | AFMT_U8,
AFMT_S16_LE,
AFMT_STEREO | AFMT_S16_LE,
0
};
static struct pcmchan_caps via_vracaps = {4000, 48000, via_fmt, 0};
static struct pcmchan_caps via_caps = {48000, 48000, via_fmt, 0};
static u_int32_t
via_rd(struct via_info *via, int regno, int size)
{
switch (size) {
case 1:
return bus_space_read_1(via->st, via->sh, regno);
case 2:
return bus_space_read_2(via->st, via->sh, regno);
case 4:
return bus_space_read_4(via->st, via->sh, regno);
default:
return 0xFFFFFFFF;
}
}
static void
via_wr(struct via_info *via, int regno, u_int32_t data, int size)
{
switch (size) {
case 1:
bus_space_write_1(via->st, via->sh, regno, data);
break;
case 2:
bus_space_write_2(via->st, via->sh, regno, data);
break;
case 4:
bus_space_write_4(via->st, via->sh, regno, data);
break;
}
}
/* -------------------------------------------------------------------- */
/* Codec interface */
static int
via_waitready_codec(struct via_info *via)
{
int i;
/* poll until codec not busy */
for (i = 0; (i < TIMEOUT) &&
(via_rd(via, VIA_CODEC_CTL, 4) & VIA_CODEC_BUSY); i++)
DELAY(1);
if (i >= TIMEOUT) {
printf("via: codec busy\n");
return 1;
}
return 0;
}
static int
via_waitvalid_codec(struct via_info *via)
{
int i;
/* poll until codec valid */
for (i = 0; (i < TIMEOUT) &&
!(via_rd(via, VIA_CODEC_CTL, 4) & VIA_CODEC_PRIVALID); i++)
DELAY(1);
if (i >= TIMEOUT) {
printf("via: codec invalid\n");
return 1;
}
return 0;
}
static int
via_write_codec(kobj_t obj, void *addr, int reg, u_int32_t val)
{
struct via_info *via = addr;
if (via_waitready_codec(via)) return -1;
via_wr(via, VIA_CODEC_CTL, VIA_CODEC_PRIVALID | VIA_CODEC_INDEX(reg) | val, 4);
return 0;
}
static int
via_read_codec(kobj_t obj, void *addr, int reg)
{
struct via_info *via = addr;
if (via_waitready_codec(via))
return -1;
via_wr(via, VIA_CODEC_CTL, VIA_CODEC_PRIVALID | VIA_CODEC_READ | VIA_CODEC_INDEX(reg),4);
if (via_waitready_codec(via))
return -1;
if (via_waitvalid_codec(via))
return -1;
return via_rd(via, VIA_CODEC_CTL, 2);
}
static kobj_method_t via_ac97_methods[] = {
KOBJMETHOD(ac97_read, via_read_codec),
KOBJMETHOD(ac97_write, via_write_codec),
{ 0, 0 }
};
AC97_DECLARE(via_ac97);
/* -------------------------------------------------------------------- */
static int
via_buildsgdt(struct via_chinfo *ch)
{
u_int32_t phys_addr, flag;
int i, segs, seg_size;
/*
* Build the scatter/gather DMA (SGD) table.
* There are four slots in the table: two for play, two for record.
* This creates two half-buffers, one of which is playing; the other
* is feeding.
*/
seg_size = ch->blksz;
segs = sndbuf_getsize(ch->buffer) / seg_size;
phys_addr = vtophys(sndbuf_getbuf(ch->buffer));
for (i = 0; i < segs; i++) {
flag = (i == segs - 1)? VIA_DMAOP_EOL : VIA_DMAOP_FLAG;
ch->sgd_table[i].ptr = phys_addr + (i * seg_size);
ch->sgd_table[i].flags = flag | seg_size;
}
return 0;
}
/* channel interface */
static void *
viachan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
{
struct via_info *via = devinfo;
struct via_chinfo *ch = (dir == PCMDIR_PLAY)? &via->pch : &via->rch;
ch->parent = via;
ch->channel = c;
ch->buffer = b;
ch->dir = dir;
ch->sgd_table = &via->sgd_table[(dir == PCMDIR_PLAY)? 0 : SEGS_PER_CHAN];
if (ch->dir == PCMDIR_PLAY) {
ch->base = VIA_PLAY_DMAOPS_BASE;
ch->count = VIA_PLAY_DMAOPS_COUNT;
ch->ctrl = VIA_RECORD_CONTROL;
ch->mode = VIA_PLAY_MODE;
} else {
ch->base = VIA_RECORD_DMAOPS_BASE;
ch->count = VIA_RECORD_DMAOPS_COUNT;
ch->ctrl = VIA_PLAY_CONTROL;
ch->mode = VIA_RECORD_MODE;
}
if (sndbuf_alloc(ch->buffer, via->parent_dmat, VIA_BUFFSIZE) == -1)
return NULL;
return ch;
}
static int
viachan_setformat(kobj_t obj, void *data, u_int32_t format)
{
struct via_chinfo *ch = data;
struct via_info *via = ch->parent;
int mode, mode_set;
mode_set = 0;
if (format & AFMT_STEREO)
mode_set |= VIA_RPMODE_STEREO;
if (format & AFMT_S16_LE)
mode_set |= VIA_RPMODE_16BIT;
DEB(printf("set format: dir = %d, format=%x\n", ch->dir, format));
mode = via_rd(via, ch->mode, 1);
mode &= ~(VIA_RPMODE_16BIT | VIA_RPMODE_STEREO);
mode |= mode_set;
via_wr(via, ch->mode, mode, 1);
return 0;
}
static int
viachan_setspeed(kobj_t obj, void *data, u_int32_t speed)
{
struct via_chinfo *ch = data;
struct via_info *via = ch->parent;
int reg;
/*
* Basic AC'97 defines a 48 kHz sample rate only. For other rates,
* upsampling is required.
*
* The VT82C686A does not perform upsampling, and neither do we.
* If the codec supports variable-rate audio (i.e. does the upsampling
* itself), then negotiate the rate with the codec. Otherwise,
* return 48 kHz cuz that's all you got.
*/
if (via->codec_caps & AC97_EXTCAP_VRA) {
reg = (ch->dir == PCMDIR_PLAY)? AC97_REGEXT_FDACRATE : AC97_REGEXT_LADCRATE;
return ac97_setrate(via->codec, reg, speed);
} else
return 48000;
}
static int
viachan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
{
struct via_chinfo *ch = data;
ch->blksz = blocksize;
sndbuf_resize(ch->buffer, SEGS_PER_CHAN, ch->blksz);
return ch->blksz;
}
static int
viachan_trigger(kobj_t obj, void *data, int go)
{
struct via_chinfo *ch = data;
struct via_info *via = ch->parent;
struct via_dma_op *ado;
if (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD)
return 0;
ado = ch->sgd_table;
DEB(printf("ado located at va=%p pa=%x\n", ado, vtophys(ado)));
if (go == PCMTRIG_START) {
via_buildsgdt(ch);
via_wr(via, ch->base, vtophys(ado), 4);
via_wr(via, ch->ctrl, VIA_RPCTRL_START, 1);
} else
via_wr(via, ch->ctrl, VIA_RPCTRL_TERMINATE, 1);
DEB(printf("viachan_trigger: go=%d\n", go));
return 0;
}
static int
viachan_getptr(kobj_t obj, void *data)
{
struct via_chinfo *ch = data;
struct via_info *via = ch->parent;
struct via_dma_op *ado;
int ptr, base, base1, len, seg;
ado = ch->sgd_table;
base1 = via_rd(via, ch->base, 4);
len = via_rd(via, ch->count, 4);
base = via_rd(via, ch->base, 4);
if (base != base1) /* Avoid race hazard */
len = via_rd(via, ch->count, 4);
DEB(printf("viachan_getptr: len / base = %x / %x\n", len, base));
/* Base points to SGD segment to do, one past current */
/* Determine how many segments have been done */
seg = (base - vtophys(ado)) / sizeof(struct via_dma_op);
if (seg == 0)
seg = SEGS_PER_CHAN;
/* Now work out offset: seg less count */
ptr = (seg * sndbuf_getsize(ch->buffer) / SEGS_PER_CHAN) - len;
if (ch->dir == PCMDIR_REC) {
/* DMA appears to operate on memory 'lines' of 32 bytes */
/* so don't return any part line - it isn't in RAM yet */
ptr = ptr & ~0x1f;
}
DEB(printf("return ptr=%d\n", ptr));
return ptr;
}
static struct pcmchan_caps *
viachan_getcaps(kobj_t obj, void *data)
{
struct via_chinfo *ch = data;
struct via_info *via = ch->parent;
return (via->codec_caps & AC97_EXTCAP_VRA)? &via_vracaps : &via_caps;
}
static kobj_method_t viachan_methods[] = {
KOBJMETHOD(channel_init, viachan_init),
KOBJMETHOD(channel_setformat, viachan_setformat),
KOBJMETHOD(channel_setspeed, viachan_setspeed),
KOBJMETHOD(channel_setblocksize, viachan_setblocksize),
KOBJMETHOD(channel_trigger, viachan_trigger),
KOBJMETHOD(channel_getptr, viachan_getptr),
KOBJMETHOD(channel_getcaps, viachan_getcaps),
{ 0, 0 }
};
CHANNEL_DECLARE(viachan);
/* -------------------------------------------------------------------- */
static void
via_intr(void *p)
{
struct via_info *via = p;
int st;
/* DEB(printf("viachan_intr\n")); */
/* Read channel */
st = via_rd(via, VIA_PLAY_STAT, 1);
if (st & VIA_RPSTAT_INTR) {
via_wr(via, VIA_PLAY_STAT, VIA_RPSTAT_INTR, 1);
chn_intr(via->pch.channel);
}
/* Write channel */
st = via_rd(via, VIA_RECORD_STAT, 1);
if (st & VIA_RPSTAT_INTR) {
via_wr(via, VIA_RECORD_STAT, VIA_RPSTAT_INTR, 1);
chn_intr(via->rch.channel);
}
}
/*
* Probe and attach the card
*/
static int
via_probe(device_t dev)
{
if (pci_get_devid(dev) == VIA_PCI_ID) {
device_set_desc(dev, "VIA VT82C686A");
return 0;
}
return ENXIO;
}
static void
dma_cb(void *p, bus_dma_segment_t *bds, int a, int b)
{
}
static int
via_attach(device_t dev)
{
struct via_info *via = 0;
char status[SND_STATUSLEN];
u_int32_t data;
if ((via = malloc(sizeof *via, M_DEVBUF, M_NOWAIT)) == NULL) {
device_printf(dev, "cannot allocate softc\n");
return ENXIO;
}
bzero(via, sizeof *via);
/* Get resources */
data = pci_read_config(dev, PCIR_COMMAND, 2);
data |= (PCIM_CMD_PORTEN | PCIM_CMD_BUSMASTEREN);
pci_write_config(dev, PCIR_COMMAND, data, 2);
data = pci_read_config(dev, PCIR_COMMAND, 2);
pci_write_config(dev, VIA_PCICONF_MISC,
VIA_PCICONF_ACLINKENAB | VIA_PCICONF_ACSGD | VIA_PCICONF_ACNOTRST | VIA_PCICONF_ACVSR, 1);
via->regid = PCIR_MAPS;
via->reg = bus_alloc_resource(dev, SYS_RES_IOPORT, &via->regid, 0, ~0, 1, RF_ACTIVE);
if (!via->reg) {
device_printf(dev, "cannot allocate bus resource.");
goto bad;
}
via->st = rman_get_bustag(via->reg);
via->sh = rman_get_bushandle(via->reg);
via->irqid = 0;
via->irq = bus_alloc_resource(dev, SYS_RES_IRQ, &via->irqid, 0, ~0, 1, RF_ACTIVE | RF_SHAREABLE);
if (!via->irq || snd_setup_intr(dev, via->irq, 0, via_intr, via, &via->ih)) {
device_printf(dev, "unable to map interrupt\n");
goto bad;
}
via_wr(via, VIA_PLAY_MODE, VIA_RPMODE_AUTOSTART | VIA_RPMODE_INTR_FLAG | VIA_RPMODE_INTR_EOL, 1);
via_wr(via, VIA_RECORD_MODE, VIA_RPMODE_AUTOSTART | VIA_RPMODE_INTR_FLAG | VIA_RPMODE_INTR_EOL, 1);
via->codec = AC97_CREATE(dev, via, via_ac97);
if (!via->codec)
goto bad;
mixer_init(dev, ac97_getmixerclass(), via->codec);
via->codec_caps = ac97_getextcaps(via->codec);
if (via->codec_caps & AC97_EXTCAP_VRA)
ac97_setextmode(via->codec, AC97_EXTCAP_VRA | AC97_EXTCAP_VRM);
/* DMA tag for buffers */
if (bus_dma_tag_create(/*parent*/NULL, /*alignment*/2, /*boundary*/0,
/*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/VIA_BUFFSIZE, /*nsegments*/1, /*maxsegz*/0x3ffff,
/*flags*/0, &via->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
/*
* DMA tag for SGD table. The 686 uses scatter/gather DMA and
* requires a list in memory of work to do. We need only 16 bytes
* for this list, and it is wasteful to allocate 16K.
*/
if (bus_dma_tag_create(/*parent*/NULL, /*alignment*/2, /*boundary*/0,
/*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/NSEGS * sizeof(struct via_dma_op),
/*nsegments*/1, /*maxsegz*/0x3ffff,
/*flags*/0, &via->sgd_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
if (bus_dmamem_alloc(via->sgd_dmat, (void **)&via->sgd_table, BUS_DMA_NOWAIT, &via->sgd_dmamap) == -1)
goto bad;
if (bus_dmamap_load(via->sgd_dmat, via->sgd_dmamap, via->sgd_table, NSEGS * sizeof(struct via_dma_op), dma_cb, 0, 0))
goto bad;
snprintf(status, SND_STATUSLEN, "at io 0x%lx irq %ld", rman_get_start(via->reg), rman_get_start(via->irq));
/* Register */
if (pcm_register(dev, via, 1, 1)) goto bad;
pcm_addchan(dev, PCMDIR_PLAY, &viachan_class, via);
pcm_addchan(dev, PCMDIR_REC, &viachan_class, via);
pcm_setstatus(dev, status);
return 0;
bad:
if (via->codec) ac97_destroy(via->codec);
if (via->reg) bus_release_resource(dev, SYS_RES_IOPORT, via->regid, via->reg);
if (via->ih) bus_teardown_intr(dev, via->irq, via->ih);
if (via->irq) bus_release_resource(dev, SYS_RES_IRQ, via->irqid, via->irq);
if (via->parent_dmat) bus_dma_tag_destroy(via->parent_dmat);
if (via->sgd_dmamap) bus_dmamap_unload(via->sgd_dmat, via->sgd_dmamap);
if (via->sgd_dmat) bus_dma_tag_destroy(via->sgd_dmat);
if (via) free(via, M_DEVBUF);
return ENXIO;
}
static int
via_detach(device_t dev)
{
int r;
struct via_info *via = 0;
r = pcm_unregister(dev);
if (r)
return r;
via = pcm_getdevinfo(dev);
bus_release_resource(dev, SYS_RES_IOPORT, via->regid, via->reg);
bus_teardown_intr(dev, via->irq, via->ih);
bus_release_resource(dev, SYS_RES_IRQ, via->irqid, via->irq);
bus_dma_tag_destroy(via->parent_dmat);
bus_dmamap_unload(via->sgd_dmat, via->sgd_dmamap);
bus_dma_tag_destroy(via->sgd_dmat);
free(via, M_DEVBUF);
return 0;
}
static device_method_t via_methods[] = {
DEVMETHOD(device_probe, via_probe),
DEVMETHOD(device_attach, via_attach),
DEVMETHOD(device_detach, via_detach),
{ 0, 0}
};
static driver_t via_driver = {
"pcm",
via_methods,
sizeof(struct snddev_info),
};
static devclass_t pcm_devclass;
DRIVER_MODULE(via, pci, via_driver, pcm_devclass, 0, 0);
MODULE_DEPEND(via, snd_pcm, PCM_MINVER, PCM_PREFVER, PCM_MAXVER);
MODULE_VERSION(via, 1);
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