458 lines
11 KiB
C
458 lines
11 KiB
C
#define _PAS2_PCM_C_
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/*
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* sound/pas2_pcm.c
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*
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* The low level driver for the Pro Audio Spectrum ADC/DAC.
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "sound_config.h"
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#ifdef CONFIGURE_SOUNDCARD
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#include "pas.h"
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extern int pcm_set_bits __P((int arg));
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extern int pcm_set_channels __P((int arg));
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extern int pcm_set_speed __P((int arg));
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#if !defined(EXCLUDE_PAS) && !defined(EXCLUDE_AUDIO)
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#define TRACE(WHAT) /*
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* * * (WHAT) */
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#define PAS_PCM_INTRBITS (0x08)
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/*
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* Sample buffer timer interrupt enable
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*/
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#define PCM_NON 0
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#define PCM_DAC 1
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#define PCM_ADC 2
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static unsigned long pcm_speed = 0; /* sampling rate */
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static unsigned char pcm_channels = 1; /* channels (1 or 2) */
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static unsigned char pcm_bits = 8; /* bits/sample (8 or 16) */
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static unsigned char pcm_filter = 0; /* filter FLAG */
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static unsigned char pcm_mode = PCM_NON;
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static unsigned long pcm_count = 0;
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static unsigned short pcm_bitsok = 8; /* mask of OK bits */
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static int my_devnum = 0;
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int
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pcm_set_speed (int arg)
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{
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int foo, tmp;
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unsigned long flags;
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if (arg > 44100)
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arg = 44100;
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if (arg < 5000)
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arg = 5000;
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foo = (1193180 + (arg / 2)) / arg;
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arg = 1193180 / foo;
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if (pcm_channels & 2)
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foo = foo >> 1;
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pcm_speed = arg;
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tmp = pas_read (FILTER_FREQUENCY);
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/*
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* Set anti-aliasing filters according to sample rate. You reall *NEED*
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* to enable this feature for all normal recording unless you want to
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* experiment with aliasing effects.
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* These filters apply to the selected "recording" source.
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* I (pfw) don't know the encoding of these 5 bits. The values shown
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* come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.
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*/
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#if !defined NO_AUTO_FILTER_SET
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tmp &= 0xe0;
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if (pcm_speed >= 2 * 17897)
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tmp |= 0x21;
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else if (pcm_speed >= 2 * 15909)
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tmp |= 0x22;
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else if (pcm_speed >= 2 * 11931)
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tmp |= 0x29;
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else if (pcm_speed >= 2 * 8948)
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tmp |= 0x31;
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else if (pcm_speed >= 2 * 5965)
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tmp |= 0x39;
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else if (pcm_speed >= 2 * 2982)
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tmp |= 0x24;
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pcm_filter = tmp;
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#endif
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DISABLE_INTR (flags);
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pas_write (tmp & ~(F_F_PCM_RATE_COUNTER | F_F_PCM_BUFFER_COUNTER), FILTER_FREQUENCY);
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pas_write (S_C_C_SAMPLE_RATE | S_C_C_LSB_THEN_MSB | S_C_C_SQUARE_WAVE, SAMPLE_COUNTER_CONTROL);
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pas_write (foo & 0xff, SAMPLE_RATE_TIMER);
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pas_write ((foo >> 8) & 0xff, SAMPLE_RATE_TIMER);
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pas_write (tmp, FILTER_FREQUENCY);
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RESTORE_INTR (flags);
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return pcm_speed;
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}
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int
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pcm_set_channels (int arg)
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{
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if ((arg != 1) && (arg != 2))
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return pcm_channels;
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if (arg != pcm_channels)
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{
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pas_write (pas_read (PCM_CONTROL) ^ P_C_PCM_MONO, PCM_CONTROL);
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pcm_channels = arg;
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pcm_set_speed (pcm_speed); /*
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* The speed must be reinitialized
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*/
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}
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return pcm_channels;
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}
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int
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pcm_set_bits (int arg)
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{
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if ((arg & pcm_bitsok) != arg)
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return pcm_bits;
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if (arg != pcm_bits)
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{
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pas_write (pas_read (SYSTEM_CONFIGURATION_2) ^ S_C_2_PCM_16_BIT, SYSTEM_CONFIGURATION_2);
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pcm_bits = arg;
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}
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return pcm_bits;
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}
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static int
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pas_pcm_ioctl (int dev, unsigned int cmd, unsigned int arg, int local)
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{
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TRACE (printk ("pas2_pcm.c: static int pas_pcm_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd, arg));
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switch (cmd)
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{
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case SOUND_PCM_WRITE_RATE:
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if (local)
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return pcm_set_speed (arg);
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return IOCTL_OUT (arg, pcm_set_speed (IOCTL_IN (arg)));
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break;
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case SOUND_PCM_READ_RATE:
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if (local)
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return pcm_speed;
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return IOCTL_OUT (arg, pcm_speed);
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break;
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case SNDCTL_DSP_STEREO:
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if (local)
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return pcm_set_channels (arg + 1) - 1;
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return IOCTL_OUT (arg, pcm_set_channels (IOCTL_IN (arg) + 1) - 1);
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break;
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case SOUND_PCM_WRITE_CHANNELS:
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if (local)
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return pcm_set_channels (arg);
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return IOCTL_OUT (arg, pcm_set_channels (IOCTL_IN (arg)));
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break;
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case SOUND_PCM_READ_CHANNELS:
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if (local)
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return pcm_channels;
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return IOCTL_OUT (arg, pcm_channels);
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break;
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case SNDCTL_DSP_SETFMT:
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if (local)
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return pcm_set_bits (arg);
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return IOCTL_OUT (arg, pcm_set_bits (IOCTL_IN (arg)));
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break;
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case SOUND_PCM_READ_BITS:
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if (local)
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return pcm_bits;
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return IOCTL_OUT (arg, pcm_bits);
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case SOUND_PCM_WRITE_FILTER: /*
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* NOT YET IMPLEMENTED
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*/
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if (IOCTL_IN (arg) > 1)
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return IOCTL_OUT (arg, RET_ERROR (EINVAL));
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break;
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pcm_filter = IOCTL_IN (arg);
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case SOUND_PCM_READ_FILTER:
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return IOCTL_OUT (arg, pcm_filter);
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break;
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default:
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return RET_ERROR (EINVAL);
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}
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return RET_ERROR (EINVAL);
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}
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static void
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pas_pcm_reset (int dev)
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{
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TRACE (printk ("pas2_pcm.c: static void pas_pcm_reset(void)\n"));
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pas_write (pas_read (PCM_CONTROL) & ~P_C_PCM_ENABLE, PCM_CONTROL);
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}
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static int
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pas_pcm_open (int dev, int mode)
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{
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int err;
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TRACE (printk ("pas2_pcm.c: static int pas_pcm_open(int mode = %X)\n", mode));
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if ((err = pas_set_intr (PAS_PCM_INTRBITS)) < 0)
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return err;
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if (DMAbuf_open_dma (dev) < 0)
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{
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pas_remove_intr (PAS_PCM_INTRBITS);
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return RET_ERROR (EBUSY);
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}
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pcm_count = 0;
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return 0;
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}
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static void
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pas_pcm_close (int dev)
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{
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unsigned long flags;
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TRACE (printk ("pas2_pcm.c: static void pas_pcm_close(void)\n"));
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DISABLE_INTR (flags);
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pas_pcm_reset (dev);
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DMAbuf_close_dma (dev);
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pas_remove_intr (PAS_PCM_INTRBITS);
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pcm_mode = PCM_NON;
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RESTORE_INTR (flags);
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}
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static void
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pas_pcm_output_block (int dev, unsigned long buf, int count,
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int intrflag, int restart_dma)
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{
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unsigned long flags, cnt;
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TRACE (printk ("pas2_pcm.c: static void pas_pcm_output_block(char *buf = %P, int count = %X)\n", buf, count));
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cnt = count;
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if (audio_devs[dev]->dmachan > 3)
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cnt >>= 1;
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if (audio_devs[dev]->flags & DMA_AUTOMODE &&
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intrflag &&
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cnt == pcm_count)
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return; /*
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* Auto mode on. No need to react
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*/
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DISABLE_INTR (flags);
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pas_write (pas_read (PCM_CONTROL) & ~P_C_PCM_ENABLE,
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PCM_CONTROL);
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if (restart_dma)
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DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE);
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if (audio_devs[dev]->dmachan > 3)
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count >>= 1;
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if (count != pcm_count)
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{
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pas_write (pas_read (FILTER_FREQUENCY) & ~F_F_PCM_BUFFER_COUNTER, FILTER_FREQUENCY);
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pas_write (S_C_C_SAMPLE_BUFFER | S_C_C_LSB_THEN_MSB | S_C_C_SQUARE_WAVE, SAMPLE_COUNTER_CONTROL);
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pas_write (count & 0xff, SAMPLE_BUFFER_COUNTER);
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pas_write ((count >> 8) & 0xff, SAMPLE_BUFFER_COUNTER);
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pas_write (pas_read (FILTER_FREQUENCY) | F_F_PCM_BUFFER_COUNTER, FILTER_FREQUENCY);
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pcm_count = count;
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}
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pas_write (pas_read (FILTER_FREQUENCY) | F_F_PCM_BUFFER_COUNTER | F_F_PCM_RATE_COUNTER, FILTER_FREQUENCY);
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pas_write (pas_read (PCM_CONTROL) | P_C_PCM_ENABLE | P_C_PCM_DAC_MODE, PCM_CONTROL);
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pcm_mode = PCM_DAC;
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RESTORE_INTR (flags);
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}
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static void
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pas_pcm_start_input (int dev, unsigned long buf, int count,
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int intrflag, int restart_dma)
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{
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unsigned long flags;
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int cnt;
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TRACE (printk ("pas2_pcm.c: static void pas_pcm_start_input(char *buf = %P, int count = %X)\n", buf, count));
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cnt = count;
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if (audio_devs[dev]->dmachan > 3)
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cnt >>= 1;
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if (audio_devs[my_devnum]->flags & DMA_AUTOMODE &&
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intrflag &&
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cnt == pcm_count)
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return; /*
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* Auto mode on. No need to react
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*/
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DISABLE_INTR (flags);
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if (restart_dma)
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DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ);
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if (audio_devs[dev]->dmachan > 3)
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count >>= 1;
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if (count != pcm_count)
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{
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pas_write (pas_read (FILTER_FREQUENCY) & ~F_F_PCM_BUFFER_COUNTER, FILTER_FREQUENCY);
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pas_write (S_C_C_SAMPLE_BUFFER | S_C_C_LSB_THEN_MSB | S_C_C_SQUARE_WAVE, SAMPLE_COUNTER_CONTROL);
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pas_write (count & 0xff, SAMPLE_BUFFER_COUNTER);
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pas_write ((count >> 8) & 0xff, SAMPLE_BUFFER_COUNTER);
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pas_write (pas_read (FILTER_FREQUENCY) | F_F_PCM_BUFFER_COUNTER, FILTER_FREQUENCY);
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pcm_count = count;
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}
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pas_write (pas_read (FILTER_FREQUENCY) | F_F_PCM_BUFFER_COUNTER | F_F_PCM_RATE_COUNTER, FILTER_FREQUENCY);
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pas_write ((pas_read (PCM_CONTROL) | P_C_PCM_ENABLE) & ~P_C_PCM_DAC_MODE, PCM_CONTROL);
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pcm_mode = PCM_ADC;
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RESTORE_INTR (flags);
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}
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static int
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pas_pcm_prepare_for_input (int dev, int bsize, int bcount)
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{
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return 0;
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}
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static int
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pas_pcm_prepare_for_output (int dev, int bsize, int bcount)
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{
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return 0;
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}
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static struct audio_operations pas_pcm_operations =
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{
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"Pro Audio Spectrum",
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DMA_AUTOMODE,
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AFMT_U8 | AFMT_S16_LE,
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NULL,
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pas_pcm_open,
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pas_pcm_close,
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pas_pcm_output_block,
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pas_pcm_start_input,
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pas_pcm_ioctl,
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pas_pcm_prepare_for_input,
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pas_pcm_prepare_for_output,
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pas_pcm_reset,
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pas_pcm_reset,
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NULL,
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NULL
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};
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long
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pas_pcm_init (long mem_start, struct address_info *hw_config)
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{
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TRACE (printk ("pas2_pcm.c: long pas_pcm_init(long mem_start = %X)\n", mem_start));
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pcm_bitsok = 8;
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if (pas_read (OPERATION_MODE_1) & O_M_1_PCM_TYPE)
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pcm_bitsok |= 16;
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pcm_set_speed (DSP_DEFAULT_SPEED);
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if (num_audiodevs < MAX_AUDIO_DEV)
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{
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audio_devs[my_devnum = num_audiodevs++] = &pas_pcm_operations;
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audio_devs[my_devnum]->dmachan = hw_config->dma;
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audio_devs[my_devnum]->buffcount = 1;
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audio_devs[my_devnum]->buffsize = 2 * DSP_BUFFSIZE;
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}
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else
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printk ("PAS2: Too many PCM devices available\n");
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return mem_start;
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}
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void
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pas_pcm_interrupt (unsigned char status, int cause)
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{
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if (cause == 1) /*
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* PCM buffer done
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*/
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{
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/*
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* Halt the PCM first. Otherwise we don't have time to start a new
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* block before the PCM chip proceeds to the next sample
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*/
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if (!(audio_devs[my_devnum]->flags & DMA_AUTOMODE))
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{
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pas_write (pas_read (PCM_CONTROL) & ~P_C_PCM_ENABLE,
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PCM_CONTROL);
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}
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switch (pcm_mode)
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{
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case PCM_DAC:
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DMAbuf_outputintr (my_devnum, 1);
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break;
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case PCM_ADC:
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DMAbuf_inputintr (my_devnum);
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break;
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default:
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printk ("PAS: Unexpected PCM interrupt\n");
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}
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}
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}
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#endif
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#endif
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