/*
* $Id: saa7134-oss.c,v 1.13 2004/12/10 12:33:39 kraxel Exp $
*
* device driver for philips saa7134 based TV cards
* oss dsp interface
*
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/soundcard.h>
#include "saa7134-reg.h"
#include "saa7134.h"
/* ------------------------------------------------------------------ */
static unsigned int oss_debug = 0;
module_param(oss_debug, int, 0644);
MODULE_PARM_DESC(oss_debug,"enable debug messages [oss]");
static unsigned int oss_rate = 0;
module_param(oss_rate, int, 0444);
MODULE_PARM_DESC(oss_rate,"sample rate (valid are: 32000,48000)");
#define dprintk(fmt, arg...) if (oss_debug) \
printk(KERN_DEBUG "%s/oss: " fmt, dev->name , ## arg)
/* ------------------------------------------------------------------ */
static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
{
blksize &= ~0xff;
if (blksize < 0x100)
blksize = 0x100;
if (blksize > 0x10000)
blksize = 0x10000;
if (blocks < 2)
blocks = 2;
while ((blksize * blocks) & ~PAGE_MASK)
blocks++;
if ((blksize * blocks) > 1024*1024)
blocks = 1024*1024 / blksize;
dev->oss.blocks = blocks;
dev->oss.blksize = blksize;
dev->oss.bufsize = blksize * blocks;
dprintk("buffer config: %d blocks / %d bytes, %d kB total\n",
blocks,blksize,blksize * blocks / 1024);
return 0;
}
static int dsp_buffer_init(struct saa7134_dev *dev)
{
int err;
if (!dev->oss.bufsize)
BUG();
videobuf_dma_init(&dev->oss.dma);
err = videobuf_dma_init_kernel(&dev->oss.dma, PCI_DMA_FROMDEVICE,
dev->oss.bufsize >> PAGE_SHIFT);
if (0 != err)
return err;
return 0;
}
static int dsp_buffer_free(struct saa7134_dev *dev)
{
if (!dev->oss.blksize)
BUG();
videobuf_dma_free(&dev->oss.dma);
dev->oss.blocks = 0;
dev->oss.blksize = 0;
dev->oss.bufsize = 0;
return 0;
}
static void dsp_dma_start(struct saa7134_dev *dev)
{
dev->oss.dma_blk = 0;
dev->oss.dma_running = 1;
saa7134_set_dmabits(dev);
}
static void dsp_dma_stop(struct saa7134_dev *dev)
{
dev->oss.dma_blk = -1;
dev->oss.dma_running = 0;
saa7134_set_dmabits(dev);
}
static int dsp_rec_start(struct saa7134_dev *dev)
{
int err, bswap, sign;
u32 fmt, control;
unsigned long flags;
/* prepare buffer */
if (0 != (err = videobuf_dma_pci_map(dev->pci,&dev->oss.dma)))
return err;
if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->oss.pt)))
goto fail1;
if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->oss.pt,
dev->oss.dma.sglist,
dev->oss.dma.sglen,
0)))
goto fail2;
/* sample format */
switch (dev->oss.afmt) {
case AFMT_U8:
case AFMT_S8: fmt = 0x00; break;
case AFMT_U16_LE:
case AFMT_U16_BE:
case AFMT_S16_LE:
case AFMT_S16_BE: fmt = 0x01; break;
default:
err = -EINVAL;
goto fail2;
}
switch (dev->oss.afmt) {
case AFMT_S8:
case AFMT_S16_LE:
case AFMT_S16_BE: sign = 1; break;
default: sign = 0; break;
}
switch (dev->oss.afmt) {
case AFMT_U16_BE:
case AFMT_S16_BE: bswap = 1; break;
default: bswap = 0; break;
}
switch (dev->pci->device) {
case PCI_DEVICE_ID_PHILIPS_SAA7134:
if (1 == dev->oss.channels)
fmt |= (1 << 3);
if (2 == dev->oss.channels)
fmt |= (3 << 3);
if (sign)
fmt |= 0x04;
fmt |= (TV == dev->oss.input) ? 0xc0 : 0x80;
saa_writeb(SAA7134_NUM_SAMPLES0, (dev->oss.blksize & 0x0000ff));
saa_writeb(SAA7134_NUM_SAMPLES1, (dev->oss.blksize & 0x00ff00) >> 8);
saa_writeb(SAA7134_NUM_SAMPLES2, (dev->oss.blksize & 0xff0000) >> 16);
saa_writeb(SAA7134_AUDIO_FORMAT_CTRL, fmt);
break;
case PCI_DEVICE_ID_PHILIPS_SAA7133:
case PCI_DEVICE_ID_PHILIPS_SAA7135:
if (1 == dev->oss.channels)
fmt |= (1 << 4);
if (2 == dev->oss.channels)
fmt |= (2 << 4);
if (!sign)
fmt |= 0x04;
saa_writel(0x588 >> 2, dev->oss.blksize -4);
saa_writel(0x58c >> 2, 0x543210 | (fmt << 24));
break;
}
dprintk("rec_start: afmt=%d ch=%d => fmt=0x%x swap=%c\n",
dev->oss.afmt, dev->oss.channels, fmt,
bswap ? 'b' : '-');
/* dma: setup channel 6 (= AUDIO) */
control = SAA7134_RS_CONTROL_BURST_16 |
SAA7134_RS_CONTROL_ME |
(dev->oss.pt.dma >> 12);
if (bswap)
control |= SAA7134_RS_CONTROL_BSWAP;
saa_writel(SAA7134_RS_BA1(6),0);
saa_writel(SAA7134_RS_BA2(6),dev->oss.blksize);
saa_writel(SAA7134_RS_PITCH(6),0);
saa_writel(SAA7134_RS_CONTROL(6),control);
/* start dma */
dev->oss.recording_on = 1;
spin_lock_irqsave(&dev->slock,flags);
dsp_dma_start(dev);
spin_unlock_irqrestore(&dev->slock,flags);
return 0;
fail2:
saa7134_pgtable_free(dev->pci,&dev->oss.pt);
fail1:
videobuf_dma_pci_unmap(dev->pci,&dev->oss.dma);
return err;
}
static int dsp_rec_stop(struct saa7134_dev *dev)
{
unsigned long flags;
dprintk("rec_stop dma_blk=%d\n",dev->oss.dma_blk);
/* stop dma */
dev->oss.recording_on = 0;
spin_lock_irqsave(&dev->slock,flags);
dsp_dma_stop(dev);
spin_unlock_irqrestore(&dev->slock,flags);
/* unlock buffer */
saa7134_pgtable_free(dev->pci,&dev->oss.pt);
videobuf_dma_pci_unmap(dev->pci,&dev->oss.dma);
return 0;
}
/* ------------------------------------------------------------------ */
static int dsp_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct saa7134_dev *h,*dev = NULL;
struct list_head *list;
int err;
list_for_each(list,&saa7134_devlist) {
h = list_entry(list, struct saa7134_dev, devlist);
if (h->oss.minor_dsp == minor)
dev = h;
}
if (NULL == dev)
return -ENODEV;
down(&dev->oss.lock);
err = -EBUSY;
if (dev->oss.users_dsp)
goto fail1;
dev->oss.users_dsp++;
file->private_data = dev;
dev->oss.afmt = AFMT_U8;
dev->oss.channels = 1;
dev->oss.read_count = 0;
dev->oss.read_offset = 0;
dsp_buffer_conf(dev,PAGE_SIZE,64);
err = dsp_buffer_init(dev);
if (0 != err)
goto fail2;
up(&dev->oss.lock);
return 0;
fail2:
dev->oss.users_dsp--;
fail1:
up(&dev->oss.lock);
return err;
}
static int dsp_release(struct inode *inode, struct file *file)
{
struct saa7134_dev *dev = file->private_data;
down(&dev->oss.lock);
if (dev->oss.recording_on)
dsp_rec_stop(dev);
dsp_buffer_free(dev);
dev->oss.users_dsp--;
file->private_data = NULL;
up(&dev->oss.lock);
return 0;
}
static ssize_t dsp_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
struct saa7134_dev *dev = file->private_data;
DECLARE_WAITQUEUE(wait, current);
unsigned int bytes;
unsigned long flags;
int err,ret = 0;
add_wait_queue(&dev->oss.wq, &wait);
down(&dev->oss.lock);
while (count > 0) {
/* wait for data if needed */
if (0 == dev->oss.read_count) {
if (!dev->oss.recording_on) {
err = dsp_rec_start(dev);
if (err < 0) {
if (0 == ret)
ret = err;
break;
}
}
if (dev->oss.recording_on &&
!dev->oss.dma_running) {
/* recover from overruns */
spin_lock_irqsave(&dev->slock,flags);
dsp_dma_start(dev);
spin_unlock_irqrestore(&dev->slock,flags);
}
if (file->f_flags & O_NONBLOCK) {
if (0 == ret)
ret = -EAGAIN;
break;
}
up(&dev->oss.lock);
set_current_state(TASK_INTERRUPTIBLE);
if (0 == dev->oss.read_count)
schedule();
set_current_state(TASK_RUNNING);
down(&dev->oss.lock);
if (signal_pending(current)) {
if (0 == ret)
ret = -EINTR;
break;
}
}
/* copy data to userspace */
bytes = count;
if (bytes > dev->oss.read_count)
bytes = dev->oss.read_count;
if (bytes > dev->oss.bufsize - dev->oss.read_offset)
bytes = dev->oss.bufsize - dev->oss.read_offset;
if (copy_to_user(buffer + ret,
dev->oss.dma.vmalloc + dev->oss.read_offset,
bytes)) {
if (0 == ret)
ret = -EFAULT;
break;
}
ret += bytes;
count -= bytes;
dev->oss.read_count -= bytes;
dev->oss.read_offset += bytes;
if (dev->oss.read_offset == dev->oss.bufsize)
dev->oss.read_offset = 0;
}
up(&dev->oss.lock);
remove_wait_queue(&dev->oss.wq, &wait);
return ret;
}
static ssize_t dsp_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static int dsp_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct saa7134_dev *dev = file->private_data;
void __user *argp = (void __user *) arg;
int __user *p = argp;
int val = 0;
if (oss_debug > 1)
saa7134_print_ioctl(dev->name,cmd);
switch (cmd) {
case OSS_GETVERSION:
return put_user(SOUND_VERSION, p);
case SNDCTL_DSP_GETCAPS:
return 0;
case SNDCTL_DSP_SPEED:
if (get_user(val, p))
return -EFAULT;
/* fall through */
case SOUND_PCM_READ_RATE:
return put_user(dev->oss.rate, p);
case SNDCTL_DSP_STEREO:
if (get_user(val, p))
return -EFAULT;
down(&dev->oss.lock);
dev->oss.channels = val ? 2 : 1;
if (dev->oss.recording_on) {
dsp_rec_stop(dev);
dsp_rec_start(dev);
}
up(&dev->oss.lock);
return put_user(dev->oss.channels-1, p);
case SNDCTL_DSP_CHANNELS:
if (get_user(val, p))
return -EFAULT;
if (val != 1 && val != 2)
return -EINVAL;
down(&dev->oss.lock);
dev->oss.channels = val;
if (dev->oss.recording_on) {
dsp_rec_stop(dev);
dsp_rec_start(dev);
}
up(&dev->oss.lock);
/* fall through */
case SOUND_PCM_READ_CHANNELS:
return put_user(dev->oss.channels, p);
case SNDCTL_DSP_GETFMTS: /* Returns a mask */
return put_user(AFMT_U8 | AFMT_S8 |
AFMT_U16_LE | AFMT_U16_BE |
AFMT_S16_LE | AFMT_S16_BE, p);
case SNDCTL_DSP_SETFMT: /* Selects ONE fmt */
if (get_user(val, p))
return -EFAULT;
switch (val) {
case AFMT_QUERY:
/* nothing to do */
break;
case AFMT_U8:
case AFMT_S8:
case AFMT_U16_LE:
case AFMT_U16_BE:
case AFMT_S16_LE:
case AFMT_S16_BE:
down(&dev->oss.lock);
dev->oss.afmt = val;
if (dev->oss.recording_on) {
dsp_rec_stop(dev);
dsp_rec_start(dev);
}
up(&dev->oss.lock);
return put_user(dev->oss.afmt, p);
default:
return -EINVAL;
}
case SOUND_PCM_READ_BITS:
switch (dev->oss.afmt) {
case AFMT_U8:
case AFMT_S8:
return put_user(8, p);
case AFMT_U16_LE:
case AFMT_U16_BE:
case AFMT_S16_LE:
case AFMT_S16_BE:
return put_user(16, p);
default:
return -EINVAL;
}
case SNDCTL_DSP_NONBLOCK:
file->f_flags |= O_NONBLOCK;
return 0;
case SNDCTL_DSP_RESET:
down(&dev->oss.lock);
if (dev->oss.recording_on)
dsp_rec_stop(dev);
up(&dev->oss.lock);
return 0;
case SNDCTL_DSP_GETBLKSIZE:
return put_user(dev->oss.blksize, p);
case SNDCTL_DSP_SETFRAGMENT:
if (get_user(val, p))
return -EFAULT;
if (dev->oss.recording_on)
return -EBUSY;
dsp_buffer_free(dev);
/* used to be arg >> 16 instead of val >> 16; fixed */
dsp_buffer_conf(dev,1 << (val & 0xffff), (val >> 16) & 0xffff);
dsp_buffer_init(dev);
return 0;
case SNDCTL_DSP_SYNC:
/* NOP */
return 0;
case SNDCTL_DSP_GETISPACE:
{
audio_buf_info info;
info.fragsize = dev->oss.blksize;
info.fragstotal = dev->oss.blocks;
info.bytes = dev->oss.read_count;
info.fragments = info.bytes / info.fragsize;
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
return 0;
}
default:
return -EINVAL;
}
}
static unsigned int dsp_poll(struct file *file, struct poll_table_struct *wait)
{
struct saa7134_dev *dev = file->private_data;
unsigned int mask = 0;
poll_wait(file, &dev->oss.wq, wait);
if (0 == dev->oss.read_count) {
down(&dev->oss.lock);
if (!dev->oss.recording_on)
dsp_rec_start(dev);
up(&dev->oss.lock);
} else
mask |= (POLLIN | POLLRDNORM);
return mask;
}
struct file_operations saa7134_dsp_fops = {
.owner = THIS_MODULE,
.open = dsp_open,
.release = dsp_release,
.read = dsp_read,
.write = dsp_write,
.ioctl = dsp_ioctl,
.poll = dsp_poll,
.llseek = no_llseek,
};
/* ------------------------------------------------------------------ */
static int
mixer_recsrc_7134(struct saa7134_dev *dev)
{
int analog_io,rate;
switch (dev->oss.input) {
case TV:
saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0xc0);
saa_andorb(SAA7134_SIF_SAMPLE_FREQ, 0x03, 0x00);
break;
case LINE1:
case LINE2:
case LINE2_LEFT:
analog_io = (LINE1 == dev->oss.input) ? 0x00 : 0x08;
rate = (32000 == dev->oss.rate) ? 0x01 : 0x03;
saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x08, analog_io);
saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0x80);
saa_andorb(SAA7134_SIF_SAMPLE_FREQ, 0x03, rate);
break;
}
return 0;
}
static int
mixer_recsrc_7133(struct saa7134_dev *dev)
{
u32 value = 0xbbbbbb;
switch (dev->oss.input) {
case TV:
value = 0xbbbb10; /* MAIN */
break;
case LINE1:
value = 0xbbbb32; /* AUX1 */
break;
case LINE2:
case LINE2_LEFT:
value = 0xbbbb54; /* AUX2 */
break;
}
saa_dsp_writel(dev, 0x46c >> 2, value);
return 0;
}
static int
mixer_recsrc(struct saa7134_dev *dev, enum saa7134_audio_in src)
{
static const char *iname[] = { "Oops", "TV", "LINE1", "LINE2" };
dev->oss.count++;
dev->oss.input = src;
dprintk("mixer input = %s\n",iname[dev->oss.input]);
switch (dev->pci->device) {
case PCI_DEVICE_ID_PHILIPS_SAA7134:
mixer_recsrc_7134(dev);
break;
case PCI_DEVICE_ID_PHILIPS_SAA7133:
case PCI_DEVICE_ID_PHILIPS_SAA7135:
mixer_recsrc_7133(dev);
break;
}
return 0;
}
static int
mixer_level(struct saa7134_dev *dev, enum saa7134_audio_in src, int level)
{
switch (dev->pci->device) {
case PCI_DEVICE_ID_PHILIPS_SAA7134:
switch (src) {
case TV:
/* nothing */
break;
case LINE1:
saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x10,
(100 == level) ? 0x00 : 0x10);
break;
case LINE2:
case LINE2_LEFT:
saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x20,
(100 == level) ? 0x00 : 0x20);
break;
}
break;
case PCI_DEVICE_ID_PHILIPS_SAA7133:
case PCI_DEVICE_ID_PHILIPS_SAA7135:
/* nothing */
break;
}
return 0;
}
/* ------------------------------------------------------------------ */
static int mixer_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct saa7134_dev *h,*dev = NULL;
struct list_head *list;
list_for_each(list,&saa7134_devlist) {
h = list_entry(list, struct saa7134_dev, devlist);
if (h->oss.minor_mixer == minor)
dev = h;
}
if (NULL == dev)
return -ENODEV;
file->private_data = dev;
return 0;
}
static int mixer_release(struct inode *inode, struct file *file)
{
file->private_data = NULL;
return 0;
}
static int mixer_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct saa7134_dev *dev = file->private_data;
enum saa7134_audio_in input;
int val,ret;
void __user *argp = (void __user *) arg;
int __user *p = argp;
if (oss_debug > 1)
saa7134_print_ioctl(dev->name,cmd);
switch (cmd) {
case OSS_GETVERSION:
return put_user(SOUND_VERSION, p);
case SOUND_MIXER_INFO:
{
mixer_info info;
memset(&info,0,sizeof(info));
strlcpy(info.id, "TV audio", sizeof(info.id));
strlcpy(info.name, dev->name, sizeof(info.name));
info.modify_counter = dev->oss.count;
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
return 0;
}
case SOUND_OLD_MIXER_INFO:
{
_old_mixer_info info;
memset(&info,0,sizeof(info));
strlcpy(info.id, "TV audio", sizeof(info.id));
strlcpy(info.name, dev->name, sizeof(info.name));
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
return 0;
}
case MIXER_READ(SOUND_MIXER_CAPS):
return put_user(SOUND_CAP_EXCL_INPUT, p);
case MIXER_READ(SOUND_MIXER_STEREODEVS):
return put_user(0, p);
case MIXER_READ(SOUND_MIXER_RECMASK):
case MIXER_READ(SOUND_MIXER_DEVMASK):
val = SOUND_MASK_LINE1 | SOUND_MASK_LINE2;
if (32000 == dev->oss.rate)
val |= SOUND_MASK_VIDEO;
return put_user(val, p);
case MIXER_WRITE(SOUND_MIXER_RECSRC):
if (get_user(val, p))
return -EFAULT;
input = dev->oss.input;
if (32000 == dev->oss.rate &&
val & SOUND_MASK_VIDEO && dev->oss.input != TV)
input = TV;
if (val & SOUND_MASK_LINE1 && dev->oss.input != LINE1)
input = LINE1;
if (val & SOUND_MASK_LINE2 && dev->oss.input != LINE2)
input = LINE2;
if (input != dev->oss.input)
mixer_recsrc(dev,input);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_RECSRC):
switch (dev->oss.input) {
case TV: ret = SOUND_MASK_VIDEO; break;
case LINE1: ret = SOUND_MASK_LINE1; break;
case LINE2: ret = SOUND_MASK_LINE2; break;
default: ret = 0;
}
return put_user(ret, p);
case MIXER_WRITE(SOUND_MIXER_VIDEO):
case MIXER_READ(SOUND_MIXER_VIDEO):
if (32000 != dev->oss.rate)
return -EINVAL;
return put_user(100 | 100 << 8, p);
case MIXER_WRITE(SOUND_MIXER_LINE1):
if (get_user(val, p))
return -EFAULT;
val &= 0xff;
val = (val <= 50) ? 50 : 100;
dev->oss.line1 = val;
mixer_level(dev,LINE1,dev->oss.line1);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_LINE1):
return put_user(dev->oss.line1 | dev->oss.line1 << 8, p);
case MIXER_WRITE(SOUND_MIXER_LINE2):
if (get_user(val, p))
return -EFAULT;
val &= 0xff;
val = (val <= 50) ? 50 : 100;
dev->oss.line2 = val;
mixer_level(dev,LINE2,dev->oss.line2);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_LINE2):
return put_user(dev->oss.line2 | dev->oss.line2 << 8, p);
default:
return -EINVAL;
}
}
struct file_operations saa7134_mixer_fops = {
.owner = THIS_MODULE,
.open = mixer_open,
.release = mixer_release,
.ioctl = mixer_ioctl,
.llseek = no_llseek,
};
/* ------------------------------------------------------------------ */
int saa7134_oss_init1(struct saa7134_dev *dev)
{
/* general */
init_MUTEX(&dev->oss.lock);
init_waitqueue_head(&dev->oss.wq);
switch (dev->pci->device) {
case PCI_DEVICE_ID_PHILIPS_SAA7133:
case PCI_DEVICE_ID_PHILIPS_SAA7135:
saa_writel(0x588 >> 2, 0x00000fff);
saa_writel(0x58c >> 2, 0x00543210);
saa_dsp_writel(dev, 0x46c >> 2, 0xbbbbbb);
break;
}
/* dsp */
dev->oss.rate = 32000;
if (oss_rate)
dev->oss.rate = oss_rate;
dev->oss.rate = (dev->oss.rate > 40000) ? 48000 : 32000;
/* mixer */
dev->oss.line1 = 50;
dev->oss.line2 = 50;
mixer_level(dev,LINE1,dev->oss.line1);
mixer_level(dev,LINE2,dev->oss.line2);
mixer_recsrc(dev, (dev->oss.rate == 32000) ? TV : LINE2);
return 0;
}
int saa7134_oss_fini(struct saa7134_dev *dev)
{
/* nothing */
return 0;
}
void saa7134_irq_oss_done(struct saa7134_dev *dev, unsigned long status)
{
int next_blk, reg = 0;
spin_lock(&dev->slock);
if (UNSET == dev->oss.dma_blk) {
dprintk("irq: recording stopped\n");
goto done;
}
if (0 != (status & 0x0f000000))
dprintk("irq: lost %ld\n", (status >> 24) & 0x0f);
if (0 == (status & 0x10000000)) {
/* odd */
if (0 == (dev->oss.dma_blk & 0x01))
reg = SAA7134_RS_BA1(6);
} else {
/* even */
if (0 == (dev->oss.dma_blk & 0x00))
reg = SAA7134_RS_BA2(6);
}
if (0 == reg) {
dprintk("irq: field oops [%s]\n",
(status & 0x10000000) ? "even" : "odd");
goto done;
}
if (dev->oss.read_count >= dev->oss.blksize * (dev->oss.blocks-2)) {
dprintk("irq: overrun [full=%d/%d]\n",dev->oss.read_count,
dev->oss.bufsize);
dsp_dma_stop(dev);
goto done;
}
/* next block addr */
next_blk = (dev->oss.dma_blk + 2) % dev->oss.blocks;
saa_writel(reg,next_blk * dev->oss.blksize);
if (oss_debug > 2)
dprintk("irq: ok, %s, next_blk=%d, addr=%x\n",
(status & 0x10000000) ? "even" : "odd ", next_blk,
next_blk * dev->oss.blksize);
/* update status & wake waiting readers */
dev->oss.dma_blk = (dev->oss.dma_blk + 1) % dev->oss.blocks;
dev->oss.read_count += dev->oss.blksize;
wake_up(&dev->oss.wq);
done:
spin_unlock(&dev->slock);
}
/* ----------------------------------------------------------- */
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
