freebsd-dev/sys/dev/sound/pcm/buffer.c
Cameron Grant fc60109d91 don't erase info in sndbuf_setup()
set free'd pointers to NULL in sndbuf_free()
add a new function
2001-05-27 14:39:34 +00:00

649 lines
14 KiB
C

/*
* Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
* 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 "feeder_if.h"
#define MIN(x, y) (((x) < (y))? (x) : (y))
#define SNDBUF_NAMELEN 48
struct snd_dbuf {
u_int8_t *buf, *tmpbuf;
unsigned int bufsize, maxsize;
volatile int dl; /* transfer size */
volatile int rp; /* pointers to the ready area */
volatile int rl; /* length of ready area */
volatile int hp;
volatile u_int32_t total, prev_total;
int isadmachan, dir; /* dma channel */
u_int32_t fmt, spd, bps;
unsigned int blksz, blkcnt;
int xrun;
u_int32_t flags;
bus_dmamap_t dmamap;
bus_dma_tag_t dmatag;
struct selinfo sel;
char name[SNDBUF_NAMELEN];
};
struct snd_dbuf *
sndbuf_create(char *drv, char *desc)
{
struct snd_dbuf *b;
b = malloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
snprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
return b;
}
void
sndbuf_destroy(struct snd_dbuf *b)
{
free(b, M_DEVBUF);
}
static void
sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
struct snd_dbuf *b = (struct snd_dbuf *)arg;
if (bootverbose) {
printf("pcm: setmap %lx, %lx; ", (unsigned long)segs->ds_addr,
(unsigned long)segs->ds_len);
printf("%p -> %lx\n", b->buf, (unsigned long)vtophys(b->buf));
}
}
/*
* Allocate memory for DMA buffer. If the device does not use DMA transfers,
* the driver can call malloc(9) and sndbuf_setup() itself.
*/
int
sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
{
b->dmatag = dmatag;
b->maxsize = size;
b->bufsize = b->maxsize;
if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT, &b->dmamap))
return ENOSPC;
if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize, sndbuf_setmap, b, 0))
return ENOSPC;
return sndbuf_resize(b, 2, b->maxsize / 2);
}
int
sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
{
b->buf = buf;
b->maxsize = size;
b->bufsize = b->maxsize;
return sndbuf_resize(b, 2, b->maxsize / 2);
}
void
sndbuf_free(struct snd_dbuf *b)
{
if (b->tmpbuf)
free(b->tmpbuf, M_DEVBUF);
b->tmpbuf = NULL;
if (b->dmamap)
bus_dmamap_unload(b->dmatag, b->dmamap);
if (b->dmamap && b->buf)
bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
b->dmamap = NULL;
b->buf = NULL;
}
int
sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
{
if (b->maxsize == 0)
return 0;
if (blkcnt == 0)
blkcnt = b->blkcnt;
if (blksz == 0)
blksz = b->blksz;
if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize))
return EINVAL;
b->blkcnt = blkcnt;
b->blksz = blksz;
b->bufsize = blkcnt * blksz;
if (b->tmpbuf)
free(b->tmpbuf, M_DEVBUF);
b->tmpbuf = malloc(b->bufsize, M_DEVBUF, M_WAITOK);
sndbuf_reset(b);
return 0;
}
int
sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
{
if (blkcnt < 2 || blksz < 16)
return EINVAL;
b->blkcnt = blkcnt;
b->blksz = blksz;
b->maxsize = blkcnt * blksz;
b->bufsize = b->maxsize;
if (b->buf)
free(b->buf, M_DEVBUF);
b->buf = malloc(b->bufsize, M_DEVBUF, M_WAITOK);
if (b->buf == NULL)
return ENOMEM;
if (b->tmpbuf)
free(b->tmpbuf, M_DEVBUF);
b->tmpbuf = malloc(b->bufsize, M_DEVBUF, M_WAITOK);
if (b->tmpbuf == NULL)
return ENOMEM;
sndbuf_reset(b);
return 0;
}
void
sndbuf_clear(struct snd_dbuf *b, unsigned int length)
{
int i;
u_char data, *p;
if (length == 0)
return;
if (length > b->bufsize)
length = b->bufsize;
if (b->fmt & AFMT_SIGNED)
data = 0x00;
else
data = 0x80;
i = sndbuf_getfreeptr(b);
p = sndbuf_getbuf(b);
while (length > 0) {
p[i] = data;
length--;
i++;
if (i >= b->bufsize)
i = 0;
}
}
void
sndbuf_fillsilence(struct snd_dbuf *b)
{
int i;
u_char data, *p;
if (b->fmt & AFMT_SIGNED)
data = 0x00;
else
data = 0x80;
i = 0;
p = sndbuf_getbuf(b);
while (i < b->bufsize)
p[i++] = data;
b->rp = 0;
b->rl = b->bufsize;
}
void
sndbuf_reset(struct snd_dbuf *b)
{
b->hp = 0;
b->rp = 0;
b->rl = 0;
b->dl = 0;
b->prev_total = 0;
b->total = 0;
b->xrun = 0;
if (b->buf && b->bufsize > 0)
sndbuf_clear(b, b->bufsize);
}
u_int32_t
sndbuf_getfmt(struct snd_dbuf *b)
{
return b->fmt;
}
int
sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
{
b->fmt = fmt;
b->bps = 1;
b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
b->bps <<= (b->fmt & AFMT_16BIT)? 1 : 0;
b->bps <<= (b->fmt & AFMT_32BIT)? 2 : 0;
return 0;
}
unsigned int
sndbuf_getspd(struct snd_dbuf *b)
{
return b->spd;
}
void
sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
{
b->spd = spd;
}
unsigned int
sndbuf_getalign(struct snd_dbuf *b)
{
static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
return align[b->bps - 1];
}
unsigned int
sndbuf_getblkcnt(struct snd_dbuf *b)
{
return b->blkcnt;
}
void
sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
{
b->blkcnt = blkcnt;
}
unsigned int
sndbuf_getblksz(struct snd_dbuf *b)
{
return b->blksz;
}
void
sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
{
b->blksz = blksz;
}
unsigned int
sndbuf_getbps(struct snd_dbuf *b)
{
return b->bps;
}
void *
sndbuf_getbuf(struct snd_dbuf *b)
{
return b->buf;
}
void *
sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
{
KASSERT((ofs >= 0) && (ofs <= b->bufsize), ("%s: ofs invalid %d", __FUNCTION__, ofs));
return b->buf + ofs;
}
unsigned int
sndbuf_getsize(struct snd_dbuf *b)
{
return b->bufsize;
}
unsigned int
sndbuf_getmaxsize(struct snd_dbuf *b)
{
return b->maxsize;
}
unsigned int
sndbuf_runsz(struct snd_dbuf *b)
{
return b->dl;
}
void
sndbuf_setrun(struct snd_dbuf *b, int go)
{
b->dl = go? b->blksz : 0;
}
struct selinfo *
sndbuf_getsel(struct snd_dbuf *b)
{
return &b->sel;
}
/************************************************************/
unsigned int
sndbuf_getxrun(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
return b->xrun;
}
void
sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
{
SNDBUF_LOCKASSERT(b);
b->xrun = cnt;
}
unsigned int
sndbuf_gethwptr(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
return b->hp;
}
void
sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
{
SNDBUF_LOCKASSERT(b);
b->hp = ptr;
}
unsigned int
sndbuf_getready(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __FUNCTION__, b->rl));
return b->rl;
}
unsigned int
sndbuf_getreadyptr(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __FUNCTION__, b->rp));
return b->rp;
}
unsigned int
sndbuf_getfree(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __FUNCTION__, b->rl));
return b->bufsize - b->rl;
}
unsigned int
sndbuf_getfreeptr(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __FUNCTION__, b->rp));
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __FUNCTION__, b->rl));
return (b->rp + b->rl) % b->bufsize;
}
unsigned int
sndbuf_getblocks(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
return b->total / b->blksz;
}
unsigned int
sndbuf_getprevblocks(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
return b->prev_total / b->blksz;
}
unsigned int
sndbuf_gettotal(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
return b->total;
}
void
sndbuf_updateprevtotal(struct snd_dbuf *b)
{
SNDBUF_LOCKASSERT(b);
b->prev_total = b->total;
}
/************************************************************/
int
sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
{
int l;
KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __FUNCTION__, count, sndbuf_getfree(b)));
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __FUNCTION__, b->rl));
b->total += count;
if (from != NULL) {
while (count > 0) {
l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
from += l;
b->rl += l;
count -= l;
}
} else
b->rl += count;
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __FUNCTION__, b->rl, count));
return 0;
}
int
sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
{
int l;
KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __FUNCTION__, count, sndbuf_getready(b)));
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __FUNCTION__, b->rl));
if (to != NULL) {
while (count > 0) {
l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
to += l;
b->rl -= l;
b->rp = (b->rp + l) % b->bufsize;
count -= l;
}
} else {
b->rl -= count;
b->rp = (b->rp + count) % b->bufsize;
}
KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __FUNCTION__, b->rl, count));
return 0;
}
int
sndbuf_uiomove(struct snd_dbuf *b, struct uio *uio, unsigned int count)
{
int x, c, p, rd, err;
err = 0;
rd = (uio->uio_rw == UIO_READ)? 1 : 0;
if (count > uio->uio_resid)
return EINVAL;
if (count > (rd? sndbuf_getready(b) : sndbuf_getfree(b))) {
return EINVAL;
}
while (err == 0 && count > 0) {
p = rd? sndbuf_getreadyptr(b) : sndbuf_getfreeptr(b);
c = MIN(count, sndbuf_getsize(b) - p);
x = uio->uio_resid;
err = uiomove(sndbuf_getbufofs(b, p), c, uio);
x -= uio->uio_resid;
count -= x;
x = rd? sndbuf_dispose(b, NULL, x) : sndbuf_acquire(b, NULL, x);
}
return 0;
}
/* count is number of bytes we want added to destination buffer */
int
sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
{
KASSERT(count > 0, ("can't feed 0 bytes"));
if (sndbuf_getfree(to) < count)
return EINVAL;
count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
if (count)
sndbuf_acquire(to, to->tmpbuf, count);
/* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
return 0;
}
/************************************************************/
void
sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
{
printf("%s: [", s);
if (what & 0x01)
printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
if (what & 0x02)
printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
if (what & 0x04)
printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
if (what & 0x08)
printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
if (what & 0x10)
printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
printf(" ]\n");
}
/************************************************************/
u_int32_t
sndbuf_getflags(struct snd_dbuf *b)
{
return b->flags;
}
void
sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
{
b->flags &= ~flags;
if (on)
b->flags |= flags;
}
/************************************************************/
int
sndbuf_isadmasetup(struct snd_dbuf *b, struct resource *drq)
{
/* should do isa_dma_acquire/isa_dma_release here */
if (drq == NULL) {
b->isadmachan = -1;
} else {
sndbuf_setflags(b, SNDBUF_F_ISADMA, 1);
b->isadmachan = rman_get_start(drq);
}
return 0;
}
int
sndbuf_isadmasetdir(struct snd_dbuf *b, int dir)
{
KASSERT(b, ("sndbuf_isadmasetdir called with b == NULL"));
KASSERT(sndbuf_getflags(b) & SNDBUF_F_ISADMA, ("sndbuf_isadmasetdir called on non-ISA buffer"));
b->dir = (dir == PCMDIR_PLAY)? ISADMA_WRITE : ISADMA_READ;
return 0;
}
void
sndbuf_isadma(struct snd_dbuf *b, int go)
{
KASSERT(b, ("sndbuf_isadma called with b == NULL"));
KASSERT(sndbuf_getflags(b) & SNDBUF_F_ISADMA, ("sndbuf_isadma called on non-ISA buffer"));
switch (go) {
case PCMTRIG_START:
/* isa_dmainit(b->chan, size); */
isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->isadmachan);
break;
case PCMTRIG_STOP:
case PCMTRIG_ABORT:
isa_dmastop(b->isadmachan);
isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->isadmachan);
break;
}
DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
b,
(go == PCMTRIG_START)? "started" : "stopped",
b->chan));
}
int
sndbuf_isadmaptr(struct snd_dbuf *b)
{
int i;
KASSERT(b, ("sndbuf_isadmaptr called with b == NULL"));
KASSERT(sndbuf_getflags(b) & SNDBUF_F_ISADMA, ("sndbuf_isadmaptr called on non-ISA buffer"));
if (!sndbuf_runsz(b))
return 0;
i = isa_dmastatus(b->isadmachan);
KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
return b->bufsize - i;
}
void
sndbuf_isadmabounce(struct snd_dbuf *b)
{
KASSERT(b, ("sndbuf_isadmabounce called with b == NULL"));
KASSERT(sndbuf_getflags(b) & SNDBUF_F_ISADMA, ("sndbuf_isadmabounce called on non-ISA buffer"));
/* tell isa_dma to bounce data in/out */
}