sb8_main.c

linux-2.6.15.6

/*
 *  Copyright (c) by Jaroslav Kysela <[e-mail]>
 *                   Uros Bizjak <[e-mail]>
 *
 *  Routines for control of 8-bit SoundBlaster cards and clones
 *  Please note: I don't have access to old SB8 soundcards.
 *
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * --
 *
 * Thu Apr 29 20:36:17 BST 1999 George David Morrison <[e-mail]>
 *   DSP can't respond to commands whilst in "high speed" mode. Caused 
 *   glitching during playback. Fixed.
 *
 * Wed Jul 12 22:02:55 CEST 2000 Uros Bizjak <[e-mail]>
 *   Cleaned up and rewrote lowlevel routines.
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/init.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/sb.h>

MODULE_AUTHOR("Jaroslav Kysela <[e-mail]>, Uros Bizjak <[e-mail]>");
MODULE_DESCRIPTION("Routines for control of 8-bit SoundBlaster cards and clones");
MODULE_LICENSE("GPL");

#define SB8_CLOCK	1000000
#define SB8_DEN(v)	((SB8_CLOCK + (v) / 2) / (v))
#define SB8_RATE(v)	(SB8_CLOCK / SB8_DEN(v))

static ratnum_t clock = {
	.num = SB8_CLOCK,
	.den_min = 1,
	.den_max = 256,
	.den_step = 1,
};

static snd_pcm_hw_constraint_ratnums_t hw_constraints_clock = {
	.nrats = 1,
	.rats = &clock,
};

static ratnum_t stereo_clocks[] = {
	{
		.num = SB8_CLOCK,
		.den_min = SB8_DEN(22050),
		.den_max = SB8_DEN(22050),
		.den_step = 1,
	},
	{
		.num = SB8_CLOCK,
		.den_min = SB8_DEN(11025),
		.den_max = SB8_DEN(11025),
		.den_step = 1,
	}
};

static int snd_sb8_hw_constraint_rate_channels(snd_pcm_hw_params_t *params,
					       snd_pcm_hw_rule_t *rule)
{
	snd_interval_t *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	if (c->min > 1) {
	  	unsigned int num = 0, den = 0;
		int err = snd_interval_ratnum(hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE),
					  2, stereo_clocks, &num, &den);
		if (err >= 0 && den) {
			params->rate_num = num;
			params->rate_den = den;
		}
		return err;
	}
	return 0;
}

static int snd_sb8_hw_constraint_channels_rate(snd_pcm_hw_params_t *params,
					       snd_pcm_hw_rule_t *rule)
{
	snd_interval_t *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
		snd_interval_t t = { .min = 1, .max = 1 };
		return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
	}
	return 0;
}

static int snd_sb8_playback_prepare(snd_pcm_substream_t * substream)
{
	unsigned long flags;
	sb_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int mixreg, rate, size, count;

	rate = runtime->rate;
	switch (chip->hardware) {
	case SB_HW_PRO:
		if (runtime->channels > 1) {
			snd_assert(rate == SB8_RATE(11025) || rate == SB8_RATE(22050), return -EINVAL);
			chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
			break;
		}
		/* fallthru */
	case SB_HW_201:
		if (rate > 23000) {
			chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
			break;
		}
		/* fallthru */
	case SB_HW_20:
		chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
		break;
	case SB_HW_10:
		chip->playback_format = SB_DSP_OUTPUT;
		break;
	default:
		return -EINVAL;
	}
	size = chip->p_dma_size = snd_pcm_lib_buffer_bytes(substream);
	count = chip->p_period_size = snd_pcm_lib_period_bytes(substream);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON);
	if (runtime->channels > 1) {
		/* set playback stereo mode */
		spin_lock(&chip->mixer_lock);
		mixreg = snd_sbmixer_read(chip, SB_DSP_STEREO_SW);
		snd_sbmixer_write(chip, SB_DSP_STEREO_SW, mixreg | 0x02);
		spin_unlock(&chip->mixer_lock);

		/* Soundblaster hardware programming reference guide, 3-23 */
		snd_sbdsp_command(chip, SB_DSP_DMA8_EXIT);
		runtime->dma_area[0] = 0x80;
		snd_dma_program(chip->dma8, runtime->dma_addr, 1, DMA_MODE_WRITE);
		/* force interrupt */
		chip->mode = SB_MODE_HALT;
		snd_sbdsp_command(chip, SB_DSP_OUTPUT);
		snd_sbdsp_command(chip, 0);
		snd_sbdsp_command(chip, 0);
	}
	snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
	if (runtime->channels > 1) {
		snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
		spin_lock(&chip->mixer_lock);
		/* save output filter status and turn it off */
		mixreg = snd_sbmixer_read(chip, SB_DSP_PLAYBACK_FILT);
		snd_sbmixer_write(chip, SB_DSP_PLAYBACK_FILT, mixreg | 0x20);
		spin_unlock(&chip->mixer_lock);
		/* just use force_mode16 for temporary storate... */
		chip->force_mode16 = mixreg;
	} else {
		snd_sbdsp_command(chip, 256 - runtime->rate_den);
	}
	if (chip->playback_format != SB_DSP_OUTPUT) {
		count--;
		snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
		snd_sbdsp_command(chip, count & 0xff);
		snd_sbdsp_command(chip, count >> 8);
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_dma_program(chip->dma8, runtime->dma_addr,
			size, DMA_MODE_WRITE | DMA_AUTOINIT);
	return 0;
}

static int snd_sb8_playback_trigger(snd_pcm_substream_t * substream,
				    int cmd)
{
	unsigned long flags;
	sb_t *chip = snd_pcm_substream_chip(substream);
	unsigned int count;

	spin_lock_irqsave(&chip->reg_lock, flags);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_sbdsp_command(chip, chip->playback_format);
		if (chip->playback_format == SB_DSP_OUTPUT) {
			count = chip->p_period_size - 1;
			snd_sbdsp_command(chip, count & 0xff);
			snd_sbdsp_command(chip, count >> 8);
		}
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		if (chip->playback_format == SB_DSP_HI_OUTPUT_AUTO) {
			snd_pcm_runtime_t *runtime = substream->runtime;
			snd_sbdsp_reset(chip);
			if (runtime->channels > 1) {
				spin_lock(&chip->mixer_lock);
				/* restore output filter and set hardware to mono mode */ 
				snd_sbmixer_write(chip, SB_DSP_STEREO_SW, chip->force_mode16 & ~0x02);
				spin_unlock(&chip->mixer_lock);
			}
		} else {
			snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
		}
		snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	chip->mode = (cmd == SNDRV_PCM_TRIGGER_START) ? SB_MODE_PLAYBACK_8 : SB_MODE_HALT;
	return 0;
}

static int snd_sb8_hw_params(snd_pcm_substream_t * substream,
			     snd_pcm_hw_params_t * hw_params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_sb8_hw_free(snd_pcm_substream_t * substream)
{
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int snd_sb8_capture_prepare(snd_pcm_substream_t * substream)
{
	unsigned long flags;
	sb_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int mixreg, rate, size, count;

	rate = runtime->rate;
	switch (chip->hardware) {
	case SB_HW_PRO:
		if (runtime->channels > 1) {
			snd_assert(rate == SB8_RATE(11025) || rate == SB8_RATE(22050), return -EINVAL);
			chip->capture_format = SB_DSP_HI_INPUT_AUTO;
			break;
		}
		chip->capture_format = (rate > 23000) ? SB_DSP_HI_INPUT_AUTO : SB_DSP_LO_INPUT_AUTO;
		break;
	case SB_HW_201:
		if (rate > 13000) {
			chip->capture_format = SB_DSP_HI_INPUT_AUTO;
			break;
		}
		/* fallthru */
	case SB_HW_20:
		chip->capture_format = SB_DSP_LO_INPUT_AUTO;
		break;
	case SB_HW_10:
		chip->capture_format = SB_DSP_INPUT;
		break;
	default:
		return -EINVAL;
	}
	size = chip->c_dma_size = snd_pcm_lib_buffer_bytes(substream);
	count = chip->c_period_size = snd_pcm_lib_period_bytes(substream);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
	if (runtime->channels > 1)
		snd_sbdsp_command(chip, SB_DSP_STEREO_8BIT);
	snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
	if (runtime->channels > 1) {
		snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
		spin_lock(&chip->mixer_lock);
		/* save input filter status and turn it off */
		mixreg = snd_sbmixer_read(chip, SB_DSP_CAPTURE_FILT);
		snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, mixreg | 0x20);
		spin_unlock(&chip->mixer_lock);
		/* just use force_mode16 for temporary storate... */
		chip->force_mode16 = mixreg;
	} else {
		snd_sbdsp_command(chip, 256 - runtime->rate_den);
	}
	if (chip->capture_format != SB_DSP_OUTPUT) {
		count--;