nm256.c

是关于linux2.5.1的完全源码

}

static int
snd_nm256_capture_trigger(snd_pcm_substream_t *substream, int cmd)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);
	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
	unsigned long flags;
	int err = 0;

	snd_assert(s != NULL, return -ENXIO);

	spin_lock_irqsave(&chip->reg_lock, flags);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		if (! s->running) {
			snd_nm256_capture_start(chip, s, substream);
			s->running = 1;
		}
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		if (s->running) {
			snd_nm256_capture_stop(chip);
			s->running = 0;
		}
		break;
	default:
		err = -EINVAL;
		break;
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return err;
}


/*
 * prepare playback/capture channel
 */
static int snd_nm256_pcm_prepare(snd_pcm_substream_t *substream)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
	unsigned long flags;

	snd_assert(s, return -ENXIO);
	s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
	s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
	s->periods = substream->runtime->periods;
	s->cur_period = 0;

	spin_lock_irqsave(&chip->reg_lock, flags);
	s->running = 0;
	snd_nm256_set_format(chip, s, substream);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	return 0;
}


/*
 * get the current pointer
 */
static snd_pcm_uframes_t
snd_nm256_playback_pointer(snd_pcm_substream_t * substream)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);
	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
	unsigned long curp;

	snd_assert(s, return 0);
	curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
	curp %= s->dma_size;
	return bytes_to_frames(substream->runtime, curp);
}

static snd_pcm_uframes_t
snd_nm256_capture_pointer(snd_pcm_substream_t * substream)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);
	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
	unsigned long curp;

	snd_assert(s != NULL, return 0);
	curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
	curp %= s->dma_size;	
	return bytes_to_frames(substream->runtime, curp);
}

#ifndef __i386__
/* FIXME: I/O space is not accessible via pointers on all architectures */

/*
 * silence / copy for playback
 */
static int
snd_nm256_playback_silence(snd_pcm_substream_t *substream,
			   int channel, /* not used (interleaved data) */
			   snd_pcm_uframes_t pos,
			   snd_pcm_uframes_t count)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
	count = frames_to_bytes(runtime, count);
	pos = frames_to_bytes(runtime, pos);
	memset_io(s->bufptr + pos, 0, count);
	return 0;
}

static int
snd_nm256_playback_copy(snd_pcm_substream_t *substream,
			int channel, /* not used (interleaved data) */
			snd_pcm_uframes_t pos,
			void *src,
			snd_pcm_uframes_t count)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
	count = frames_to_bytes(runtime, count);
	pos = frames_to_bytes(runtime, pos);
	if (copy_from_user_toio(s->bufptr + pos, src, count))
		return -EFAULT;
	return 0;
}

/*
 * copy to user
 */
static int
snd_nm256_capture_copy(snd_pcm_substream_t *substream,
		       int channel, /* not used (interleaved data) */
		       snd_pcm_uframes_t pos,
		       void *dst,
		       snd_pcm_uframes_t count)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
	count = frames_to_bytes(runtime, count);
	pos = frames_to_bytes(runtime, pos);
	if (copy_to_user_fromio(dst, s->bufptr + pos, count))
		return -EFAULT;
	return 0;
}

#endif /* !__i386__ */


/*
 * update playback/capture watermarks
 */

/* spinlock held! */
static void
snd_nm256_playback_update(nm256_t *chip)
{
	nm256_stream_t *s;

	s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
	if (s->running && s->substream) {
		spin_unlock(&chip->reg_lock);
		snd_pcm_period_elapsed(s->substream);
		spin_lock(&chip->reg_lock);
		snd_nm256_playback_mark(chip, s);
	}
}

/* spinlock held! */
static void
snd_nm256_capture_update(nm256_t *chip)
{
	nm256_stream_t *s;

	s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
	if (s->running && s->substream) {
		spin_unlock(&chip->reg_lock);
		snd_pcm_period_elapsed(s->substream);
		spin_lock(&chip->reg_lock);
		snd_nm256_capture_mark(chip, s);
	}
}

/*
 * hardware info
 */
static snd_pcm_hardware_t snd_nm256_playback =
{
	info:
#ifdef __i386__
				SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID|
#endif
				SNDRV_PCM_INFO_INTERLEAVED |
				/*SNDRV_PCM_INFO_PAUSE |*/
				SNDRV_PCM_INFO_RESUME,
	formats:		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	rates:			SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
	rate_min:		8000,
	rate_max:		48000,
	channels_min:		1,
	channels_max:		2,
	periods_min:		2,
	periods_max:		1024,
	buffer_bytes_max:	128 * 1024,
	period_bytes_min:	256,
	period_bytes_max:	128 * 1024,
};

static snd_pcm_hardware_t snd_nm256_capture =
{
	info:
#ifdef __i386__
				SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID|
#endif
				SNDRV_PCM_INFO_INTERLEAVED |
				/*SNDRV_PCM_INFO_PAUSE |*/
				SNDRV_PCM_INFO_RESUME,
	formats:		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	rates:			SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
	rate_min:		8000,
	rate_max:		48000,
	channels_min:		1,
	channels_max:		2,
	periods_min:		2,
	periods_max:		1024,
	buffer_bytes_max:	128 * 1024,
	period_bytes_min:	256,
	period_bytes_max:	128 * 1024,
};


/* set dma transfer size */
static int snd_nm256_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *hw_params)
{
	/* area and addr are already set and unchanged */
	substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
	return 0;
}

/*
 * open
 */
static void snd_nm256_setup_stream(nm256_t *chip, nm256_stream_t *s,
				   snd_pcm_substream_t *substream,
				   snd_pcm_hardware_t *hw_ptr)
{
	snd_pcm_runtime_t *runtime = substream->runtime;

	s->running = 0;
	runtime->hw = *hw_ptr;
	runtime->hw.buffer_bytes_max = s->bufsize;
	runtime->hw.period_bytes_max = s->bufsize / 2;
	runtime->dma_area = (void*) s->bufptr;
	runtime->dma_addr = s->bufptr_addr;
	runtime->dma_bytes = s->bufsize;
	runtime->private_data = s;
	s->substream = substream;

	snd_pcm_set_sync(substream);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				   &constraints_rates);
}

static int
snd_nm256_playback_open(snd_pcm_substream_t *substream)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);

	snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
			       substream, &snd_nm256_playback);
	return 0;
}

static int
snd_nm256_capture_open(snd_pcm_substream_t *substream)
{
	nm256_t *chip = snd_pcm_substream_chip(substream);

	snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
			       substream, &snd_nm256_capture);
	return 0;
}

/*
 * close - we don't have to do special..
 */
static int
snd_nm256_playback_close(snd_pcm_substream_t *substream)
{
	return 0;
}


static int
snd_nm256_capture_close(snd_pcm_substream_t *substream)
{
	return 0;
}

/*
 * create a pcm instance
 */
static snd_pcm_ops_t snd_nm256_playback_ops = {
	open:		snd_nm256_playback_open,
	close:		snd_nm256_playback_close,
	ioctl:		snd_pcm_lib_ioctl,
	hw_params:	snd_nm256_pcm_hw_params,
	prepare:	snd_nm256_pcm_prepare,
	trigger:	snd_nm256_playback_trigger,
	pointer:	snd_nm256_playback_pointer,
#ifndef __i386__
	copy:		snd_nm256_playback_copy,
	silence:	snd_nm256_playback_silence,
#endif
};

static snd_pcm_ops_t snd_nm256_capture_ops = {
	open:		snd_nm256_capture_open,
	close:		snd_nm256_capture_close,
	ioctl:		snd_pcm_lib_ioctl,
	hw_params:	snd_nm256_pcm_hw_params,
	prepare:	snd_nm256_pcm_prepare,
	trigger:	snd_nm256_capture_trigger,
	pointer:	snd_nm256_capture_pointer,
#ifndef __i386__
	copy:		snd_nm256_capture_copy,
#endif
};

static int __init
snd_nm256_pcm(nm256_t *chip, int device)
{
	snd_pcm_t *pcm;
	int i, err;

	for (i = 0; i < 2; i++) {
		nm256_stream_t *s = &chip->streams[i];
		s->bufptr = chip->buffer +  s->buf - chip->buffer_start;
		s->bufptr_addr = chip->buffer_addr + s->buf - chip->buffer_start;
	}

	err = snd_pcm_new(chip->card, chip->card->driver, device,
			  1, 1, &pcm);
	if (err < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	chip->pcm = pcm;

	return 0;
}


/* 
 * Initialize the hardware. 
 */
static void
snd_nm256_init_chip(nm256_t *chip)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->reg_lock, flags);
	/* Reset everything. */
	snd_nm256_writeb(chip, 0x0, 0x11);
	snd_nm256_writew(chip, 0x214, 0);
	/* stop sounds.. */
	//snd_nm256_playback_stop(chip);
	//snd_nm256_capture_stop(chip);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
}


inline static void
snd_nm256_intr_check(nm256_t *chip)
{
	if (chip->badintrcount++ > 1000) {
		/*
		 * I'm not sure if the best thing is to stop the card from
		 * playing or just release the interrupt (after all, we're in
		 * a bad situation, so doing fancy stuff may not be such a good
		 * idea).
		 *
		 * I worry about the card engine continuing to play noise
		 * over and over, however--that could become a very
		 * obnoxious problem.  And we know that when this usually
		 * happens things are fairly safe, it just means the user's
		 * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
		 */
		if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
			snd_nm256_playback_stop(chip);
		if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
			snd_nm256_capture_stop(chip);
		chip->badintrcount = 0;
	}
}

/* 
 * Handle a potential interrupt for the device referred to by DEV_ID. 
 *
 * I don't like the cut-n-paste job here either between the two routines,
 * but there are sufficient differences between the two interrupt handlers
 * that parameterizing it isn't all that great either.  (Could use a macro,
 * I suppose...yucky bleah.)
 */

static void
snd_nm256_interrupt(int irq, void *dev_id, struct pt_regs *dummy)
{
	nm256_t *chip = snd_magic_cast(nm256_t, dev_id, return);
	u16 status;
	u8 cbyte;

	status = snd_nm256_readw(chip, NM_INT_REG);

	/* Not ours. */
	if (status == 0) {
		snd_nm256_intr_check(chip);
		return;
	}

	chip->badintrcount = 0;

	/* Rather boring; check for individual interrupts and process them. */

	spin_lock(&chip->reg_lock);
	if (status & NM_PLAYBACK_INT) {
		status &= ~NM_PLAYBACK_INT;
		NM_ACK_INT(chip, NM_PLAYBACK_INT);
		snd_nm256_playback_update(chip);
	}

	if (status & NM_RECORD_INT) {
		status &= ~NM_RECORD_INT;
		NM_ACK_INT(chip, NM_RECORD_INT);
		snd_nm256_capture_update(chip);
	}

	if (status & NM_MISC_INT_1) {
		status &= ~NM_MISC_INT_1;
		NM_ACK_INT(chip, NM_MISC_INT_1);
		snd_printd("NM256: Got misc interrupt #1\n");
		snd_nm256_writew(chip, NM_INT_REG, 0x8000);
		cbyte = snd_nm256_readb(chip, 0x400);
		snd_nm256_writeb(chip, 0x400, cbyte | 2);
	}

	if (status & NM_MISC_INT_2) {
		status &= ~NM_MISC_INT_2;
		NM_ACK_INT(chip, NM_MISC_INT_2);
		snd_printd("NM256: Got misc interrupt #2\n");
		cbyte = snd_nm256_readb(chip, 0x400);
		snd_nm256_writeb(chip, 0x400, cbyte & ~2);
	}

	/* Unknown interrupt. */
	if (status) {
		snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
			   status);
		/* Pray. */
		NM_ACK_INT(chip, status);
	}

	spin_unlock(&chip->reg_lock);
}

/*
 * Handle a potential interrupt for the device referred to by DEV_ID.
 * This handler is for the 256ZX, and is very similar to the non-ZX
 * routine.
 */

static void
snd_nm256_interrupt_zx(int irq, void *dev_id, struct pt_regs *dummy)
{
	nm256_t *chip = snd_magic_cast(nm256_t, dev_id, return);
	u32 status;
	u8 cbyte;

	status = snd_nm256_readl(chip, NM_INT_REG);

	/* Not ours. */
	if (status == 0) {
		snd_nm256_intr_check(chip);
		return;
	}

	chip->badintrcount = 0;

	/* Rather boring; check for individual interrupts and process them. */

	spin_lock(&chip->reg_lock);
	if (status & NM2_PLAYBACK_INT) {
		status &= ~NM2_PLAYBACK_INT;
		NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
		snd_nm256_playback_update(chip);
	}

	if (status & NM2_RECORD_INT) {
		status &= ~NM2_RECORD_INT;
		NM2_ACK_INT(chip, NM2_RECORD_INT);
		snd_nm256_capture_update(chip);
	}

	if (status & NM2_MISC_INT_1) {
		status &= ~NM2_MISC_INT_1;
		NM2_ACK_INT(chip, NM2_MISC_INT_1);
		snd_printd("NM256: Got misc interrupt #1\n");
		cbyte = snd_nm256_readb(chip, 0x400);
		snd_nm256_writeb(chip, 0x400, cbyte | 2);
	}

	if (status & NM2_MISC_INT_2) {
		status &= ~NM2_MISC_INT_2;
		NM2_ACK_INT(chip, NM2_MISC_INT_2);
		snd_printd("NM256: Got misc interrupt #2\n");
		cbyte = snd_nm256_readb(chip, 0x400);
		snd_nm256_writeb(chip, 0x400, cbyte & ~2);
	}

	/* Unknown interrupt. */
	if (status) {
		snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
			   status);
		/* Pray. */
		NM2_ACK_INT(chip, status);
	}

	spin_unlock(&chip->reg_lock);
}

/*
 * AC97 interface
 */

/*
 * Waits for the mixer to become ready to be written; returns a zero value
 * if it timed out.
 */
static int
snd_nm256_ac97_ready(nm256_t *chip)
{
	int timeout = 10;
	u32 testaddr;
	u16 testb;

	testaddr = chip->mixer_status_offset;
	testb = chip->mixer_status_mask;

	/* 
	 * Loop around waiting for the mixer to become ready. 
	 */
	while (timeout-- > 0) {
		if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
			return 1;
		udelay(100);
	}
	return 0;
}

/*
 */
static unsigned short