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* drivers/sound/vidc_audio.c
*
* Audio routines for the VIDC
*
* Copyright (C) 1997 Russell King <rmk@arm.uk.linux.org>
*/
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/system.h>
#include "sound_config.h"
#include "vidc.h"
/*
* VIDC sound
*
* When using SERIAL SOUND mode (external DAC), the number of physical
* channels is fixed at 2. Therefore, the sample rate = vidc sample rate.
*/
static int vidc_adev;
static int vidc_audio_volume;
static int vidc_audio_rate;
static char vidc_audio_format;
static char vidc_audio_channels;
extern void vidc_update_filler(int bits, int channels);
int vidc_audio_get_volume(void)
{
return vidc_audio_volume;
}
int vidc_audio_set_volume(int newvol)
{
vidc_audio_volume = newvol;
return vidc_audio_volume;
}
static int vidc_audio_set_bits(int fmt)
{
printk("setting format: %d\n", fmt);
switch (fmt)
{
case AFMT_QUERY:
break;
case AFMT_U8:
case AFMT_S8:
case AFMT_S16_LE:
vidc_audio_format = fmt;
vidc_update_filler(vidc_audio_format, vidc_audio_channels);
break;
default:
vidc_audio_format = AFMT_S16_LE;
vidc_update_filler(vidc_audio_format, vidc_audio_channels);
break;
}
return vidc_audio_format;
}
static int vidc_audio_set_rate(int rate)
{
if (rate)
{
int newsize, new2size;
vidc_audio_rate = ((500000 / rate) + 1) >> 1;
if (vidc_audio_rate < 3)
vidc_audio_rate = 3;
if (vidc_audio_rate > 255)
vidc_audio_rate = 255;
outl((vidc_audio_rate - 2) | 0xb0000000, IO_VIDC_BASE);
outl(0xb1000003, IO_VIDC_BASE);
newsize = (10000 / vidc_audio_rate) & ~3;
if (newsize < 208)
newsize = 208;
if (newsize > 4096)
newsize = 4096;
for (new2size = 128; new2size < newsize; new2size <<= 1);
if (new2size - newsize > newsize - (new2size >> 1))
new2size >>= 1;
dma_bufsize = new2size;
}
return 250000 / vidc_audio_rate;
}
static int vidc_audio_set_channels(int channels)
{
switch (channels)
{
case 0:
break;
case 1:
case 2:
vidc_audio_channels = channels;
vidc_update_filler(vidc_audio_format, vidc_audio_channels);
break;
default:
vidc_audio_channels = 2;
vidc_update_filler(vidc_audio_format, vidc_audio_channels);
break;
}
return vidc_audio_channels;
}
/*
* Open the device
*
* dev - device
* mode - mode to open device (logical OR of OPEN_READ and OPEN_WRITE)
*
* Called when opening the DMAbuf (dmabuf.c:259)
*/
static int vidc_audio_open(int dev, int mode)
{
if (vidc_busy)
return -EBUSY;
if ((mode & OPEN_READ) && (!mode & OPEN_WRITE))
{
/* This audio device doesn't have recording capability */
return -EIO;
}
vidc_busy = 1;
return 0;
}
/*
* Close the device
*
* dev - device
*
* Called when closing the DMAbuf (dmabuf.c:477)
* after halt_xfer
*/
static void vidc_audio_close(int dev)
{
vidc_busy = 0;
}
static int vidc_audio_ioctl(int dev, unsigned int cmd, caddr_t arg)
{
int ret;
switch (cmd)
{
case SOUND_PCM_WRITE_RATE:
if (get_user(ret, (int *) arg))
return -EFAULT;
ret = vidc_audio_set_rate(ret);
break;
case SOUND_PCM_READ_RATE:
ret = vidc_audio_set_rate(0);
break;
case SNDCTL_DSP_STEREO:
if (get_user(ret, (int *) arg))
return -EFAULT;
ret = vidc_audio_set_channels(ret + 1) - 1;
break;
case SOUND_PCM_WRITE_CHANNELS:
if (get_user(ret, (int *) arg))
return -EFAULT;
ret = vidc_audio_set_channels(ret);
break;
case SOUND_PCM_READ_CHANNELS:
ret = vidc_audio_set_channels(0);
break;
case SNDCTL_DSP_SETFMT:
if (get_user(ret, (int *) arg))
return -EFAULT;
ret = vidc_audio_set_bits(ret);
break;
case SOUND_PCM_READ_BITS:
ret = vidc_audio_set_bits(0);
break;
case SOUND_PCM_WRITE_FILTER:
case SOUND_PCM_READ_FILTER:
return -EINVAL;
default:
return -EINVAL;
}
return put_user(ret, (int *) arg);
}
/*
* Output a block via DMA to sound device
*
* dev - device number
* buf - physical address of buffer
* total_count - total byte count in buffer
* intrflag - set if this has been called from an interrupt (via DMAbuf_outputintr)
* restart_dma - set if DMA needs to be re-initialised
*
* Called when:
* 1. Starting output (dmabuf.c:1327)
* 2. (dmabuf.c:1504)
* 3. A new buffer needs to be sent to the device (dmabuf.c:1579)
*/
static void vidc_audio_output_block(int dev, unsigned long buf, int total_count,
int intrflag)
{
struct audio_operations *adev = audio_devs[dev];
struct dma_buffparms *dmap = adev->dmap_out;
dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
dma_count = total_count;
if (!(adev->flags & DMA_ACTIVE))
{
unsigned long flags;
printk("kicking output: %lX+%lX [%lX]\n", dma_start, dma_count, *(unsigned long *)dma_start);
save_flags_cli(flags);
vidc_sound_dma_irq(0, NULL, NULL);
outb(DMA_CR_E | 0x10, IOMD_SD0CR);
restore_flags(flags);
}
}
static void vidc_audio_start_input(int dev, unsigned long buf, int count,
int intrflag)
{
}
static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
{
return -EINVAL;
}
static void vidc_audio_dma_interrupt(void)
{
DMAbuf_outputintr(vidc_adev, 1);
}
/*
* Prepare for outputting samples to `dev'
*
* Each buffer that will be passed will be `bsize' bytes long,
* with a total of `bcount' buffers.
*
* Called when:
* 1. A trigger enables audio output (dmabuf.c:978)
* 2. We get a write buffer without dma_mode setup (dmabuf.c:1152)
* 3. We restart a transfer (dmabuf.c:1324)
*/
static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
{
audio_devs[dev]->dmap_out->flags |= DMA_NODMA;
dma_interrupt = vidc_audio_dma_interrupt;
return 0;
}
/*
* Stop our current operation.
*/
static void vidc_audio_reset(int dev)
{
/* stop interrupts. Our real interrupt routine
* will close DMA down for us
*/
dma_interrupt = NULL;
}
static int vidc_audio_local_qlen(int dev)
{
return /*dma_count !=*/ 0;
}
static struct audio_driver vidc_audio_driver =
{
vidc_audio_open, /* open */
vidc_audio_close, /* close */
vidc_audio_output_block, /* output_block */
vidc_audio_start_input, /* start_input */
vidc_audio_ioctl, /* ioctl */
vidc_audio_prepare_for_input, /* prepare_for_input */
vidc_audio_prepare_for_output, /* prepare_for_output */
vidc_audio_reset, /* reset */
vidc_audio_local_qlen, /*+local_qlen */
NULL, /*+copy_from_user */
NULL, /*+halt_input */
NULL, /* halt_output */
NULL, /*+trigger */
NULL, /*+set_speed */
NULL, /*+set_bits */
NULL, /*+set_channels */
};
void vidc_audio_init(struct address_info *hw_config)
{
vidc_audio_volume = 100 | (100 << 8);
if ((vidc_adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION,
"VIDCsound", &vidc_audio_driver,
sizeof(struct audio_driver),
DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
NULL, hw_config->dma, hw_config->dma2)) >= 0)
{
audio_devs[vidc_adev]->min_fragment = 10; /* 1024 bytes => 64 buffers */
audio_devs[vidc_adev]->mixer_dev = num_mixers;
}
else printk(KERN_ERR "VIDCsound: Too many PCM devices available\n");
}
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