es1688_lib.c

是关于linux2.5.1的完全源码

/*
 *  Copyright (c) by Jaroslav Kysela <[e-mail]>
 *  Routines for control of ESS ES1688/688/488 chip
 *
 *
 *   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
 *
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/es1688.h>
#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <[e-mail]>");
MODULE_DESCRIPTION("ESS ESx688 lowlevel module");
MODULE_CLASSES("{sound}");
MODULE_LICENSE("GPL");

#define chip_t es1688_t

static int snd_es1688_dsp_command(es1688_t *chip, unsigned char val)
{
	int i;

	for (i = 10000; i; i--)
		if ((inb(ES1688P(chip, STATUS)) & 0x80) == 0) {
			outb(val, ES1688P(chip, COMMAND));
			return 1;
		}
#ifdef CONFIG_SND_DEBUG
	printk("snd_es1688_dsp_command: timeout (0x%x)\n", val);
#endif
	return 0;
}

static int snd_es1688_dsp_get_byte(es1688_t *chip)
{
	int i;

	for (i = 1000; i; i--)
		if (inb(ES1688P(chip, DATA_AVAIL)) & 0x80)
			return inb(ES1688P(chip, READ));
	snd_printd("es1688 get byte failed: 0x%lx = 0x%x!!!\n", ES1688P(chip, DATA_AVAIL), inb(ES1688P(chip, DATA_AVAIL)));
	return -ENODEV;
}

static int snd_es1688_write(es1688_t *chip,
			    unsigned char reg, unsigned char data)
{
	if (!snd_es1688_dsp_command(chip, reg))
		return 0;
	return snd_es1688_dsp_command(chip, data);
}

int snd_es1688_read(es1688_t *chip, unsigned char reg)
{
	/* Read a byte from an extended mode register of ES1688 */
	if (!snd_es1688_dsp_command(chip, 0xc0))
		return -1;
	if (!snd_es1688_dsp_command(chip, reg))
		return -1;
	return snd_es1688_dsp_get_byte(chip);
}

void snd_es1688_mixer_write(es1688_t *chip,
			    unsigned char reg, unsigned char data)
{
	outb(reg, ES1688P(chip, MIXER_ADDR));
	udelay(10);
	outb(data, ES1688P(chip, MIXER_DATA));
	udelay(10);
}

unsigned char snd_es1688_mixer_read(es1688_t *chip, unsigned char reg)
{
	unsigned char result;

	outb(reg, ES1688P(chip, MIXER_ADDR));
	udelay(10);
	result = inb(ES1688P(chip, MIXER_DATA));
	udelay(10);
	return result;
}

static int snd_es1688_reset(es1688_t *chip)
{
	int i;

	outb(3, ES1688P(chip, RESET));		/* valid only for ESS chips, SB -> 1 */
	udelay(10);
	outb(0, ES1688P(chip, RESET));
	udelay(30);
	for (i = 0; i < 1000 && !(inb(ES1688P(chip, DATA_AVAIL)) & 0x80); i++);
	if (inb(ES1688P(chip, READ)) != 0xaa) {
		snd_printd("ess_reset at 0x%lx: failed!!!\n", chip->port);
		return -ENODEV;
	}
	snd_es1688_dsp_command(chip, 0xc6);	/* enable extended mode */
	return 0;
}

static int snd_es1688_probe(es1688_t *chip)
{
	unsigned long flags;
	unsigned short major, minor, hw;
	int i;

	/*
	 *  initialization sequence
	 */

	spin_lock_irqsave(&chip->reg_lock, flags);	/* Some ESS1688 cards need this */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE2));	/* ENABLE2 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE2));	/* ENABLE2 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE2));	/* ENABLE2 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE0));	/* ENABLE0 */

	if (snd_es1688_reset(chip) < 0) {
		snd_printdd("ESS: [0x%lx] reset failed... 0x%x\n", chip->port, inb(ES1688P(chip, READ)));
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		return -ENODEV;
	}
	snd_es1688_dsp_command(chip, 0xe7);	/* return identification */

	for (i = 1000, major = minor = 0; i; i--) {
		if (inb(ES1688P(chip, DATA_AVAIL)) & 0x80) {
			if (major == 0) {
				major = inb(ES1688P(chip, READ));
			} else {
				minor = inb(ES1688P(chip, READ));
			}
		}
	}

	spin_unlock_irqrestore(&chip->reg_lock, flags);

	snd_printdd("ESS: [0x%lx] found.. major = 0x%x, minor = 0x%x\n", chip->port, major, minor);

	chip->version = (major << 8) | minor;
	if (!chip->version)
		return -ENODEV;	/* probably SB */

	hw = ES1688_HW_AUTO;
	switch (chip->version & 0xfff0) {
	case 0x4880:
		snd_printk("[0x%lx] ESS: AudioDrive ES488 detected, but driver is in another place\n", chip->port);
		return -ENODEV;
	case 0x6880:
		hw = (chip->version & 0x0f) >= 8 ? ES1688_HW_1688 : ES1688_HW_688;
		break;
	default:
		snd_printk("[0x%lx] ESS: unknown AudioDrive chip with version 0x%x (Jazz16 soundcard?)\n", chip->port, chip->version);
		return -ENODEV;
	}

	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_write(chip, 0xb1, 0x10);	/* disable IRQ */
	snd_es1688_write(chip, 0xb2, 0x00);	/* disable DMA */
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	/* enable joystick, but disable OPL3 */
	spin_lock_irqsave(&chip->mixer_lock, flags);
	snd_es1688_mixer_write(chip, 0x40, 0x01);
	spin_unlock_irqrestore(&chip->mixer_lock, flags);

	return 0;
}

static int snd_es1688_init(es1688_t * chip, int enable)
{
	static int irqs[16] = {-1, -1, 0, -1, -1, 1, -1, 2, -1, 0, 3, -1, -1, -1, -1, -1};
	unsigned long flags;
	int cfg, irq_bits, dma, dma_bits, tmp, tmp1;

	/* ok.. setup MPU-401 port and joystick and OPL3 */
	cfg = 0x01;		/* enable joystick, but disable OPL3 */
	if (enable && chip->mpu_port >= 0x300 && chip->mpu_irq > 0 && chip->hardware != ES1688_HW_688) {
		tmp = (chip->mpu_port & 0x0f0) >> 4;
		if (tmp <= 3) {
			switch (chip->mpu_irq) {
			case 9:
				tmp1 = 4;
				break;
			case 5:
				tmp1 = 5;
				break;
			case 7:
				tmp1 = 6;
				break;
			case 10:
				tmp1 = 7;
				break;
			default:
				tmp1 = 0;
			}
			if (tmp1) {
				cfg |= (tmp << 3) | (tmp1 << 5);
			}
		}
	}
#if 0
	snd_printk("mpu cfg = 0x%x\n", cfg);
#endif
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_mixer_write(chip, 0x40, cfg);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	/* --- */
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_read(chip, 0xb1);
	snd_es1688_read(chip, 0xb2);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	if (enable) {
		cfg = 0xf0;	/* enable only DMA counter interrupt */
		irq_bits = irqs[chip->irq & 0x0f];
		if (irq_bits < 0) {
			snd_printk("[0x%lx] ESS: bad IRQ %d for ES1688 chip!!\n", chip->port, chip->irq);
#if 0
			irq_bits = 0;
			cfg = 0x10;
#endif
			return -EINVAL;
		}
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_es1688_write(chip, 0xb1, cfg | (irq_bits << 2));
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		cfg = 0xf0;	/* extended mode DMA enable */
		dma = chip->dma8;
		if (dma > 3 || dma == 2) {
			snd_printk("[0x%lx] ESS: bad DMA channel %d for ES1688 chip!!\n", chip->port, dma);
#if 0
			dma_bits = 0;
			cfg = 0x00;	/* disable all DMA */
#endif
			return -EINVAL;
		} else {
			dma_bits = dma;
			if (dma != 3)
				dma_bits++;
		}
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_es1688_write(chip, 0xb2, cfg | (dma_bits << 2));
		spin_unlock_irqrestore(&chip->reg_lock, flags);
	} else {
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_es1688_write(chip, 0xb1, 0x10);	/* disable IRQ */
		snd_es1688_write(chip, 0xb2, 0x00);	/* disable DMA */
		spin_unlock_irqrestore(&chip->reg_lock, flags);
	}
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_read(chip, 0xb1);
	snd_es1688_read(chip, 0xb2);
	snd_es1688_reset(chip);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

/*

 */

static ratnum_t clocks[2] = {
	{
		num: 795444,
		den_min: 1,
		den_max: 128,
		den_step: 1,
	},
	{
		num: 397722,
		den_min: 1,
		den_max: 128,
		den_step: 1,
	}
};

static snd_pcm_hw_constraint_ratnums_t hw_constraints_clocks  = {
	nrats: 2,
	rats: clocks,
};

static void snd_es1688_set_rate(es1688_t *chip, snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int bits, divider;

	if (runtime->rate_num == clocks[0].num)
		bits = 256 - runtime->rate_den;
	else
		bits = 128 - runtime->rate_den;
	/* set filter register */
	divider = 256 - 7160000*20/(8*82*runtime->rate);
	/* write result to hardware */
	snd_es1688_write(chip, 0xa1, bits);
	snd_es1688_write(chip, 0xa2, divider);
}

static int snd_es1688_ioctl(snd_pcm_substream_t * substream,
			    unsigned int cmd, void *arg)
{
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_es1688_trigger(es1688_t *chip, int cmd, unsigned char value)
{
	int val;

	if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		value = 0x00;
	} else if (cmd != SNDRV_PCM_TRIGGER_START) {
		return -EINVAL;
	}
	spin_lock(&chip->reg_lock);
	chip->trigger_value = value;
	val = snd_es1688_read(chip, 0xb8);
	if ((val < 0) || (val & 0x0f) == value) {
		spin_unlock(&chip->reg_lock);
		return -EINVAL;	/* something is wrong */
	}
#if 0
	printk("trigger: val = 0x%x, value = 0x%x\n", val, value);
	printk("trigger: residue = 0x%x\n", get_dma_residue(chip->dma8));
#endif
	snd_es1688_write(chip, 0xb8, (val & 0xf0) | value);
	spin_unlock(&chip->reg_lock);
	return 0;
}

static int snd_es1688_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_es1688_hw_free(snd_pcm_substream_t * substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_es1688_playback_prepare(snd_pcm_substream_t * substream)
{
	unsigned long flags;
	es1688_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_reset(chip);
	snd_es1688_set_rate(chip, substream);
	snd_es1688_write(chip, 0xb8, 4);	/* auto init DMA mode */
	snd_es1688_write(chip, 0xa8, (snd_es1688_read(chip, 0xa8) & ~0x03) | (3 - runtime->channels));
	snd_es1688_write(chip, 0xb9, 2);	/* demand mode (4 bytes/request) */
	if (runtime->channels == 1) {
		if (snd_pcm_format_width(runtime->format) == 8) {
			/* 8. bit mono */
			snd_es1688_write(chip, 0xb6, 0x80);
			snd_es1688_write(chip, 0xb7, 0x51);
			snd_es1688_write(chip, 0xb7, 0xd0);
		} else {
			/* 16. bit mono */
			snd_es1688_write(chip, 0xb6, 0x00);
			snd_es1688_write(chip, 0xb7, 0x71);
			snd_es1688_write(chip, 0xb7, 0xf4);
		}
	} else {
		if (snd_pcm_format_width(runtime->format) == 8) {
			/* 8. bit stereo */
			snd_es1688_write(chip, 0xb6, 0x80);
			snd_es1688_write(chip, 0xb7, 0x51);
			snd_es1688_write(chip, 0xb7, 0x98);
		} else {
			/* 16. bit stereo */
			snd_es1688_write(chip, 0xb6, 0x00);
			snd_es1688_write(chip, 0xb7, 0x71);
			snd_es1688_write(chip, 0xb7, 0xbc);
		}
	}
	snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
	snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
	snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKON);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	/* --- */
	count = -count;
	snd_dma_program(chip->dma8, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_write(chip, 0xa4, (unsigned char) count);
	snd_es1688_write(chip, 0xa5, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static int snd_es1688_playback_trigger(snd_pcm_substream_t * substream,
				       int cmd)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	return snd_es1688_trigger(chip, cmd, 0x05);
}

static int snd_es1688_capture_prepare(snd_pcm_substream_t * substream)
{
	unsigned long flags;
	es1688_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_reset(chip);
	snd_es1688_set_rate(chip, substream);
	snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKOFF);
	snd_es1688_write(chip, 0xb8, 0x0e);	/* auto init DMA mode */
	snd_es1688_write(chip, 0xa8, (snd_es1688_read(chip, 0xa8) & ~0x03) | (3 - runtime->channels));
	snd_es1688_write(chip, 0xb9, 2);	/* demand mode (4 bytes/request) */
	if (runtime->channels == 1) {
		if (snd_pcm_format_width(runtime->format) == 8) {
			/* 8. bit mono */
			snd_es1688_write(chip, 0xb7, 0x51);
			snd_es1688_write(chip, 0xb7, 0xd0);
		} else {
			/* 16. bit mono */
			snd_es1688_write(chip, 0xb7, 0x71);
			snd_es1688_write(chip, 0xb7, 0xf4);
		}
	} else {
		if (snd_pcm_format_width(runtime->format) == 8) {
			/* 8. bit stereo */
			snd_es1688_write(chip, 0xb7, 0x51);
			snd_es1688_write(chip, 0xb7, 0x98);
		} else {
			/* 16. bit stereo */
			snd_es1688_write(chip, 0xb7, 0x71);
			snd_es1688_write(chip, 0xb7, 0xbc);
		}
	}
	snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
	snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	/* --- */
	count = -count;
	snd_dma_program(chip->dma8, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1688_write(chip, 0xa4, (unsigned char) count);
	snd_es1688_write(chip, 0xa5, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static int snd_es1688_capture_trigger(snd_pcm_substream_t * substream,
				      int cmd)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	return snd_es1688_trigger(chip, cmd, 0x0f);
}

void snd_es1688_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	es1688_t *chip = snd_magic_cast(es1688_t, dev_id, return);

	if (chip->trigger_value == 0x05)	/* ok.. playback is active */
		snd_pcm_period_elapsed(chip->playback_substream);
	if (chip->trigger_value == 0x0f)	/* ok.. capture is active */
		snd_pcm_period_elapsed(chip->capture_substream);

	inb(ES1688P(chip, DATA_AVAIL));	/* ack interrupt */
}

static snd_pcm_uframes_t snd_es1688_playback_pointer(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	
	if (chip->trigger_value != 0x05)
		return 0;
	ptr = chip->dma_size - snd_dma_residue(chip->dma8);
	return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_es1688_capture_pointer(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	
	if (chip->trigger_value != 0x0f)
		return 0;
	ptr = chip->dma_size - snd_dma_residue(chip->dma8);
	return bytes_to_frames(substream->runtime, ptr);
}

/*

 */

static snd_pcm_hardware_t snd_es1688_playback =
{
	info:			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	formats:		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	rates:			SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	rate_min:		4000,
	rate_max:		48000,
	channels_min:		1,
	channels_max:		2,
	buffer_bytes_max:	65536,