420 lines
8.7 KiB
C
420 lines
8.7 KiB
C
/*
|
|
* pas2_pcm.c Audio routines for PAS16
|
|
*
|
|
*
|
|
* Copyright (C) by Hannu Savolainen 1993-1997
|
|
*
|
|
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
|
|
* Version 2 (June 1991). See the "COPYING" file distributed with this software
|
|
* for more info.
|
|
*
|
|
*
|
|
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
|
|
* Alan Cox : Swatted a double allocation of device bug. Made a few
|
|
* more things module options.
|
|
* Bartlomiej Zolnierkiewicz : Added __init to pas_pcm_init()
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/timex.h>
|
|
#include "sound_config.h"
|
|
|
|
#include "pas2.h"
|
|
|
|
#define PAS_PCM_INTRBITS (0x08)
|
|
/*
|
|
* Sample buffer timer interrupt enable
|
|
*/
|
|
|
|
#define PCM_NON 0
|
|
#define PCM_DAC 1
|
|
#define PCM_ADC 2
|
|
|
|
static unsigned long pcm_speed; /* sampling rate */
|
|
static unsigned char pcm_channels = 1; /* channels (1 or 2) */
|
|
static unsigned char pcm_bits = 8; /* bits/sample (8 or 16) */
|
|
static unsigned char pcm_filter; /* filter FLAG */
|
|
static unsigned char pcm_mode = PCM_NON;
|
|
static unsigned long pcm_count;
|
|
static unsigned short pcm_bitsok = 8; /* mask of OK bits */
|
|
static int pcm_busy;
|
|
int pas_audiodev = -1;
|
|
static int open_mode;
|
|
|
|
extern spinlock_t pas_lock;
|
|
|
|
static int pcm_set_speed(int arg)
|
|
{
|
|
int foo, tmp;
|
|
unsigned long flags;
|
|
|
|
if (arg == 0)
|
|
return pcm_speed;
|
|
|
|
if (arg > 44100)
|
|
arg = 44100;
|
|
if (arg < 5000)
|
|
arg = 5000;
|
|
|
|
if (pcm_channels & 2)
|
|
{
|
|
foo = ((PIT_TICK_RATE / 2) + (arg / 2)) / arg;
|
|
arg = ((PIT_TICK_RATE / 2) + (foo / 2)) / foo;
|
|
}
|
|
else
|
|
{
|
|
foo = (PIT_TICK_RATE + (arg / 2)) / arg;
|
|
arg = (PIT_TICK_RATE + (foo / 2)) / foo;
|
|
}
|
|
|
|
pcm_speed = arg;
|
|
|
|
tmp = pas_read(0x0B8A);
|
|
|
|
/*
|
|
* Set anti-aliasing filters according to sample rate. You really *NEED*
|
|
* to enable this feature for all normal recording unless you want to
|
|
* experiment with aliasing effects.
|
|
* These filters apply to the selected "recording" source.
|
|
* I (pfw) don't know the encoding of these 5 bits. The values shown
|
|
* come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.
|
|
*
|
|
* I cleared bit 5 of these values, since that bit controls the master
|
|
* mute flag. (Olav Wölfelschneider)
|
|
*
|
|
*/
|
|
#if !defined NO_AUTO_FILTER_SET
|
|
tmp &= 0xe0;
|
|
if (pcm_speed >= 2 * 17897)
|
|
tmp |= 0x01;
|
|
else if (pcm_speed >= 2 * 15909)
|
|
tmp |= 0x02;
|
|
else if (pcm_speed >= 2 * 11931)
|
|
tmp |= 0x09;
|
|
else if (pcm_speed >= 2 * 8948)
|
|
tmp |= 0x11;
|
|
else if (pcm_speed >= 2 * 5965)
|
|
tmp |= 0x19;
|
|
else if (pcm_speed >= 2 * 2982)
|
|
tmp |= 0x04;
|
|
pcm_filter = tmp;
|
|
#endif
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
|
|
pas_write(tmp & ~(0x40 | 0x80), 0x0B8A);
|
|
pas_write(0x00 | 0x30 | 0x04, 0x138B);
|
|
pas_write(foo & 0xff, 0x1388);
|
|
pas_write((foo >> 8) & 0xff, 0x1388);
|
|
pas_write(tmp, 0x0B8A);
|
|
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
|
|
return pcm_speed;
|
|
}
|
|
|
|
static int pcm_set_channels(int arg)
|
|
{
|
|
|
|
if ((arg != 1) && (arg != 2))
|
|
return pcm_channels;
|
|
|
|
if (arg != pcm_channels)
|
|
{
|
|
pas_write(pas_read(0xF8A) ^ 0x20, 0xF8A);
|
|
|
|
pcm_channels = arg;
|
|
pcm_set_speed(pcm_speed); /* The speed must be reinitialized */
|
|
}
|
|
return pcm_channels;
|
|
}
|
|
|
|
static int pcm_set_bits(int arg)
|
|
{
|
|
if (arg == 0)
|
|
return pcm_bits;
|
|
|
|
if ((arg & pcm_bitsok) != arg)
|
|
return pcm_bits;
|
|
|
|
if (arg != pcm_bits)
|
|
{
|
|
pas_write(pas_read(0x8389) ^ 0x04, 0x8389);
|
|
|
|
pcm_bits = arg;
|
|
}
|
|
return pcm_bits;
|
|
}
|
|
|
|
static int pas_audio_ioctl(int dev, unsigned int cmd, void __user *arg)
|
|
{
|
|
int val, ret;
|
|
int __user *p = arg;
|
|
|
|
switch (cmd)
|
|
{
|
|
case SOUND_PCM_WRITE_RATE:
|
|
if (get_user(val, p))
|
|
return -EFAULT;
|
|
ret = pcm_set_speed(val);
|
|
break;
|
|
|
|
case SOUND_PCM_READ_RATE:
|
|
ret = pcm_speed;
|
|
break;
|
|
|
|
case SNDCTL_DSP_STEREO:
|
|
if (get_user(val, p))
|
|
return -EFAULT;
|
|
ret = pcm_set_channels(val + 1) - 1;
|
|
break;
|
|
|
|
case SOUND_PCM_WRITE_CHANNELS:
|
|
if (get_user(val, p))
|
|
return -EFAULT;
|
|
ret = pcm_set_channels(val);
|
|
break;
|
|
|
|
case SOUND_PCM_READ_CHANNELS:
|
|
ret = pcm_channels;
|
|
break;
|
|
|
|
case SNDCTL_DSP_SETFMT:
|
|
if (get_user(val, p))
|
|
return -EFAULT;
|
|
ret = pcm_set_bits(val);
|
|
break;
|
|
|
|
case SOUND_PCM_READ_BITS:
|
|
ret = pcm_bits;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return put_user(ret, p);
|
|
}
|
|
|
|
static void pas_audio_reset(int dev)
|
|
{
|
|
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A); /* Disable PCM */
|
|
}
|
|
|
|
static int pas_audio_open(int dev, int mode)
|
|
{
|
|
int err;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
if (pcm_busy)
|
|
{
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
pcm_busy = 1;
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
|
|
if ((err = pas_set_intr(PAS_PCM_INTRBITS)) < 0)
|
|
return err;
|
|
|
|
|
|
pcm_count = 0;
|
|
open_mode = mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pas_audio_close(int dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
|
|
pas_audio_reset(dev);
|
|
pas_remove_intr(PAS_PCM_INTRBITS);
|
|
pcm_mode = PCM_NON;
|
|
|
|
pcm_busy = 0;
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
}
|
|
|
|
static void pas_audio_output_block(int dev, unsigned long buf, int count,
|
|
int intrflag)
|
|
{
|
|
unsigned long flags, cnt;
|
|
|
|
cnt = count;
|
|
if (audio_devs[dev]->dmap_out->dma > 3)
|
|
cnt >>= 1;
|
|
|
|
if (audio_devs[dev]->flags & DMA_AUTOMODE &&
|
|
intrflag &&
|
|
cnt == pcm_count)
|
|
return;
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
|
|
pas_write(pas_read(0xF8A) & ~0x40,
|
|
0xF8A);
|
|
|
|
/* DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE); */
|
|
|
|
if (audio_devs[dev]->dmap_out->dma > 3)
|
|
count >>= 1;
|
|
|
|
if (count != pcm_count)
|
|
{
|
|
pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
|
|
pas_write(0x40 | 0x30 | 0x04, 0x138B);
|
|
pas_write(count & 0xff, 0x1389);
|
|
pas_write((count >> 8) & 0xff, 0x1389);
|
|
pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
|
|
|
|
pcm_count = count;
|
|
}
|
|
pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
|
|
#ifdef NO_TRIGGER
|
|
pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
|
|
#endif
|
|
|
|
pcm_mode = PCM_DAC;
|
|
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
}
|
|
|
|
static void pas_audio_start_input(int dev, unsigned long buf, int count,
|
|
int intrflag)
|
|
{
|
|
unsigned long flags;
|
|
int cnt;
|
|
|
|
cnt = count;
|
|
if (audio_devs[dev]->dmap_out->dma > 3)
|
|
cnt >>= 1;
|
|
|
|
if (audio_devs[pas_audiodev]->flags & DMA_AUTOMODE &&
|
|
intrflag &&
|
|
cnt == pcm_count)
|
|
return;
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
|
|
/* DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ); */
|
|
|
|
if (audio_devs[dev]->dmap_out->dma > 3)
|
|
count >>= 1;
|
|
|
|
if (count != pcm_count)
|
|
{
|
|
pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
|
|
pas_write(0x40 | 0x30 | 0x04, 0x138B);
|
|
pas_write(count & 0xff, 0x1389);
|
|
pas_write((count >> 8) & 0xff, 0x1389);
|
|
pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
|
|
|
|
pcm_count = count;
|
|
}
|
|
pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
|
|
#ifdef NO_TRIGGER
|
|
pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
|
|
#endif
|
|
|
|
pcm_mode = PCM_ADC;
|
|
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
}
|
|
|
|
#ifndef NO_TRIGGER
|
|
static void pas_audio_trigger(int dev, int state)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pas_lock, flags);
|
|
state &= open_mode;
|
|
|
|
if (state & PCM_ENABLE_OUTPUT)
|
|
pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
|
|
else if (state & PCM_ENABLE_INPUT)
|
|
pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
|
|
else
|
|
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
|
|
|
|
spin_unlock_irqrestore(&pas_lock, flags);
|
|
}
|
|
#endif
|
|
|
|
static int pas_audio_prepare_for_input(int dev, int bsize, int bcount)
|
|
{
|
|
pas_audio_reset(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int pas_audio_prepare_for_output(int dev, int bsize, int bcount)
|
|
{
|
|
pas_audio_reset(dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct audio_driver pas_audio_driver =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = pas_audio_open,
|
|
.close = pas_audio_close,
|
|
.output_block = pas_audio_output_block,
|
|
.start_input = pas_audio_start_input,
|
|
.ioctl = pas_audio_ioctl,
|
|
.prepare_for_input = pas_audio_prepare_for_input,
|
|
.prepare_for_output = pas_audio_prepare_for_output,
|
|
.halt_io = pas_audio_reset,
|
|
.trigger = pas_audio_trigger
|
|
};
|
|
|
|
void __init pas_pcm_init(struct address_info *hw_config)
|
|
{
|
|
pcm_bitsok = 8;
|
|
if (pas_read(0xEF8B) & 0x08)
|
|
pcm_bitsok |= 16;
|
|
|
|
pcm_set_speed(DSP_DEFAULT_SPEED);
|
|
|
|
if ((pas_audiodev = sound_install_audiodrv(AUDIO_DRIVER_VERSION,
|
|
"Pro Audio Spectrum",
|
|
&pas_audio_driver,
|
|
sizeof(struct audio_driver),
|
|
DMA_AUTOMODE,
|
|
AFMT_U8 | AFMT_S16_LE,
|
|
NULL,
|
|
hw_config->dma,
|
|
hw_config->dma)) < 0)
|
|
printk(KERN_WARNING "PAS16: Too many PCM devices available\n");
|
|
}
|
|
|
|
void pas_pcm_interrupt(unsigned char status, int cause)
|
|
{
|
|
if (cause == 1)
|
|
{
|
|
/*
|
|
* Halt the PCM first. Otherwise we don't have time to start a new
|
|
* block before the PCM chip proceeds to the next sample
|
|
*/
|
|
|
|
if (!(audio_devs[pas_audiodev]->flags & DMA_AUTOMODE))
|
|
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
|
|
|
|
switch (pcm_mode)
|
|
{
|
|
case PCM_DAC:
|
|
DMAbuf_outputintr(pas_audiodev, 1);
|
|
break;
|
|
|
|
case PCM_ADC:
|
|
DMAbuf_inputintr(pas_audiodev);
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING "PAS: Unexpected PCM interrupt\n");
|
|
}
|
|
}
|
|
}
|