diff options
Diffstat (limited to 'sound/oss/pas2_pcm.c')
| -rw-r--r-- | sound/oss/pas2_pcm.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/sound/oss/pas2_pcm.c b/sound/oss/pas2_pcm.c new file mode 100644 index 00000000000..4af6aafa3d8 --- /dev/null +++ b/sound/oss/pas2_pcm.c @@ -0,0 +1,437 @@ +/* + * 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 <asm/timex.h> +#include "sound_config.h" + +#include "pas2.h" + +#ifndef DEB +#define DEB(WHAT) +#endif + +#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 = ((CLOCK_TICK_RATE / 2) + (arg / 2)) / arg; + arg = ((CLOCK_TICK_RATE / 2) + (foo / 2)) / foo; + } + else + { + foo = (CLOCK_TICK_RATE + (arg / 2)) / arg; + arg = (CLOCK_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; + + DEB(printk("pas2_pcm.c: static int pas_audio_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd, 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) +{ + DEB(printk("pas2_pcm.c: static void pas_audio_reset(void)\n")); + + pas_write(pas_read(0xF8A) & ~0x40, 0xF8A); /* Disable PCM */ +} + +static int pas_audio_open(int dev, int mode) +{ + int err; + unsigned long flags; + + DEB(printk("pas2_pcm.c: static int pas_audio_open(int mode = %X)\n", mode)); + + 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; + + DEB(printk("pas2_pcm.c: static void pas_audio_close(void)\n")); + + 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; + + DEB(printk("pas2_pcm.c: static void pas_audio_output_block(char *buf = %P, int count = %X)\n", buf, count)); + + 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; + + DEB(printk("pas2_pcm.c: static void pas_audio_start_input(char *buf = %P, int count = %X)\n", buf, count)); + + 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) +{ + DEB(printk("pas2_pcm.c: long pas_pcm_init()\n")); + + 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"); + } + } +} |