pmac.c

linux 内核源代码

				 SNDRV_PCM_INFO_MMAP_VALID |
				 SNDRV_PCM_INFO_RESUME),
	.formats =		SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_8000_44100,
	.rate_min =		7350,
	.rate_max =		44100,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	131072,
	.period_bytes_min =	256,
	.period_bytes_max =	16384,
	.periods_min =		3,
	.periods_max =		PMAC_MAX_FRAGS,
};


#if 0 // NYI
static int snd_pmac_hw_rule_rate(struct snd_pcm_hw_params *params,
				 struct snd_pcm_hw_rule *rule)
{
	struct snd_pmac *chip = rule->private;
	struct pmac_stream *rec = snd_pmac_get_stream(chip, rule->deps[0]);
	int i, freq_table[8], num_freqs;

	if (! rec)
		return -EINVAL;
	num_freqs = 0;
	for (i = chip->num_freqs - 1; i >= 0; i--) {
		if (rec->cur_freqs & (1 << i))
			freq_table[num_freqs++] = chip->freq_table[i];
	}

	return snd_interval_list(hw_param_interval(params, rule->var),
				 num_freqs, freq_table, 0);
}

static int snd_pmac_hw_rule_format(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
{
	struct snd_pmac *chip = rule->private;
	struct pmac_stream *rec = snd_pmac_get_stream(chip, rule->deps[0]);

	if (! rec)
		return -EINVAL;
	return snd_mask_refine_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT),
				   rec->cur_formats);
}
#endif // NYI

static int snd_pmac_pcm_open(struct snd_pmac *chip, struct pmac_stream *rec,
			     struct snd_pcm_substream *subs)
{
	struct snd_pcm_runtime *runtime = subs->runtime;
	int i;

	/* look up frequency table and fill bit mask */
	runtime->hw.rates = 0;
	for (i = 0; i < chip->num_freqs; i++)
		if (chip->freqs_ok & (1 << i))
			runtime->hw.rates |=
				snd_pcm_rate_to_rate_bit(chip->freq_table[i]);

	/* check for minimum and maximum rates */
	for (i = 0; i < chip->num_freqs; i++) {
		if (chip->freqs_ok & (1 << i)) {
			runtime->hw.rate_max = chip->freq_table[i];
			break;
		}
	}
	for (i = chip->num_freqs - 1; i >= 0; i--) {
		if (chip->freqs_ok & (1 << i)) {
			runtime->hw.rate_min = chip->freq_table[i];
			break;
		}
	}
	runtime->hw.formats = chip->formats_ok;
	if (chip->can_capture) {
		if (! chip->can_duplex)
			runtime->hw.info |= SNDRV_PCM_INFO_HALF_DUPLEX;
		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
	}
	runtime->private_data = rec;
	rec->substream = subs;

#if 0 /* FIXME: still under development.. */
	snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
			    snd_pmac_hw_rule_rate, chip, rec->stream, -1);
	snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
			    snd_pmac_hw_rule_format, chip, rec->stream, -1);
#endif

	runtime->hw.periods_max = rec->cmd.size - 1;

	/* constraints to fix choppy sound */
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	return 0;
}

static int snd_pmac_pcm_close(struct snd_pmac *chip, struct pmac_stream *rec,
			      struct snd_pcm_substream *subs)
{
	struct pmac_stream *astr;

	snd_pmac_dma_stop(rec);

	astr = snd_pmac_get_stream(chip, another_stream(rec->stream));
	if (! astr)
		return -EINVAL;

	/* reset constraints */
	astr->cur_freqs = chip->freqs_ok;
	astr->cur_formats = chip->formats_ok;
	
	return 0;
}

static int snd_pmac_playback_open(struct snd_pcm_substream *subs)
{
	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

	subs->runtime->hw = snd_pmac_playback;
	return snd_pmac_pcm_open(chip, &chip->playback, subs);
}

static int snd_pmac_capture_open(struct snd_pcm_substream *subs)
{
	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

	subs->runtime->hw = snd_pmac_capture;
	return snd_pmac_pcm_open(chip, &chip->capture, subs);
}

static int snd_pmac_playback_close(struct snd_pcm_substream *subs)
{
	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

	return snd_pmac_pcm_close(chip, &chip->playback, subs);
}

static int snd_pmac_capture_close(struct snd_pcm_substream *subs)
{
	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

	return snd_pmac_pcm_close(chip, &chip->capture, subs);
}

/*
 */

static struct snd_pcm_ops snd_pmac_playback_ops = {
	.open =		snd_pmac_playback_open,
	.close =	snd_pmac_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_pmac_pcm_hw_params,
	.hw_free =	snd_pmac_pcm_hw_free,
	.prepare =	snd_pmac_playback_prepare,
	.trigger =	snd_pmac_playback_trigger,
	.pointer =	snd_pmac_playback_pointer,
};

static struct snd_pcm_ops snd_pmac_capture_ops = {
	.open =		snd_pmac_capture_open,
	.close =	snd_pmac_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_pmac_pcm_hw_params,
	.hw_free =	snd_pmac_pcm_hw_free,
	.prepare =	snd_pmac_capture_prepare,
	.trigger =	snd_pmac_capture_trigger,
	.pointer =	snd_pmac_capture_pointer,
};

int __init snd_pmac_pcm_new(struct snd_pmac *chip)
{
	struct snd_pcm *pcm;
	int err;
	int num_captures = 1;

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

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_pmac_playback_ops);
	if (chip->can_capture)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_pmac_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcm = pcm;

	chip->formats_ok = SNDRV_PCM_FMTBIT_S16_BE;
	if (chip->can_byte_swap)
		chip->formats_ok |= SNDRV_PCM_FMTBIT_S16_LE;

	chip->playback.cur_formats = chip->formats_ok;
	chip->capture.cur_formats = chip->formats_ok;
	chip->playback.cur_freqs = chip->freqs_ok;
	chip->capture.cur_freqs = chip->freqs_ok;

	/* preallocate 64k buffer */
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      &chip->pdev->dev,
					      64 * 1024, 64 * 1024);

	return 0;
}


static void snd_pmac_dbdma_reset(struct snd_pmac *chip)
{
	out_le32(&chip->playback.dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
	snd_pmac_wait_ack(&chip->playback);
	out_le32(&chip->capture.dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
	snd_pmac_wait_ack(&chip->capture);
}


/*
 * handling beep
 */
void snd_pmac_beep_dma_start(struct snd_pmac *chip, int bytes, unsigned long addr, int speed)
{
	struct pmac_stream *rec = &chip->playback;

	snd_pmac_dma_stop(rec);
	st_le16(&chip->extra_dma.cmds->req_count, bytes);
	st_le16(&chip->extra_dma.cmds->xfer_status, 0);
	st_le32(&chip->extra_dma.cmds->cmd_dep, chip->extra_dma.addr);
	st_le32(&chip->extra_dma.cmds->phy_addr, addr);
	st_le16(&chip->extra_dma.cmds->command, OUTPUT_MORE + BR_ALWAYS);
	out_le32(&chip->awacs->control,
		 (in_le32(&chip->awacs->control) & ~0x1f00)
		 | (speed << 8));
	out_le32(&chip->awacs->byteswap, 0);
	snd_pmac_dma_set_command(rec, &chip->extra_dma);
	snd_pmac_dma_run(rec, RUN);
}

void snd_pmac_beep_dma_stop(struct snd_pmac *chip)
{
	snd_pmac_dma_stop(&chip->playback);
	st_le16(&chip->extra_dma.cmds->command, DBDMA_STOP);
	snd_pmac_pcm_set_format(chip); /* reset format */
}


/*
 * interrupt handlers
 */
static irqreturn_t
snd_pmac_tx_intr(int irq, void *devid)
{
	struct snd_pmac *chip = devid;
	snd_pmac_pcm_update(chip, &chip->playback);
	return IRQ_HANDLED;
}


static irqreturn_t
snd_pmac_rx_intr(int irq, void *devid)
{
	struct snd_pmac *chip = devid;
	snd_pmac_pcm_update(chip, &chip->capture);
	return IRQ_HANDLED;
}


static irqreturn_t
snd_pmac_ctrl_intr(int irq, void *devid)
{
	struct snd_pmac *chip = devid;
	int ctrl = in_le32(&chip->awacs->control);

	/*printk("pmac: control interrupt.. 0x%x\n", ctrl);*/
	if (ctrl & MASK_PORTCHG) {
		/* do something when headphone is plugged/unplugged? */
		if (chip->update_automute)
			chip->update_automute(chip, 1);
	}
	if (ctrl & MASK_CNTLERR) {
		int err = (in_le32(&chip->awacs->codec_stat) & MASK_ERRCODE) >> 16;
		if (err && chip->model <= PMAC_SCREAMER)
			snd_printk(KERN_DEBUG "error %x\n", err);
	}
	/* Writing 1s to the CNTLERR and PORTCHG bits clears them... */
	out_le32(&chip->awacs->control, ctrl);
	return IRQ_HANDLED;
}


/*
 * a wrapper to feature call for compatibility
 */
static void snd_pmac_sound_feature(struct snd_pmac *chip, int enable)
{
	if (ppc_md.feature_call)
		ppc_md.feature_call(PMAC_FTR_SOUND_CHIP_ENABLE, chip->node, 0, enable);
}

/*
 * release resources
 */

static int snd_pmac_free(struct snd_pmac *chip)
{
	/* stop sounds */
	if (chip->initialized) {
		snd_pmac_dbdma_reset(chip);
		/* disable interrupts from awacs interface */
		out_le32(&chip->awacs->control, in_le32(&chip->awacs->control) & 0xfff);
	}

	if (chip->node)
		snd_pmac_sound_feature(chip, 0);

	/* clean up mixer if any */
	if (chip->mixer_free)
		chip->mixer_free(chip);

	snd_pmac_detach_beep(chip);

	/* release resources */
	if (chip->irq >= 0)
		free_irq(chip->irq, (void*)chip);
	if (chip->tx_irq >= 0)
		free_irq(chip->tx_irq, (void*)chip);
	if (chip->rx_irq >= 0)
		free_irq(chip->rx_irq, (void*)chip);
	snd_pmac_dbdma_free(chip, &chip->playback.cmd);
	snd_pmac_dbdma_free(chip, &chip->capture.cmd);
	snd_pmac_dbdma_free(chip, &chip->extra_dma);
	if (chip->macio_base)
		iounmap(chip->macio_base);
	if (chip->latch_base)
		iounmap(chip->latch_base);
	if (chip->awacs)
		iounmap(chip->awacs);
	if (chip->playback.dma)
		iounmap(chip->playback.dma);
	if (chip->capture.dma)
		iounmap(chip->capture.dma);

	if (chip->node) {
		int i;
		for (i = 0; i < 3; i++) {
			if (chip->requested & (1 << i))
				release_mem_region(chip->rsrc[i].start,
						   chip->rsrc[i].end -
						   chip->rsrc[i].start + 1);
		}
	}

	if (chip->pdev)
		pci_dev_put(chip->pdev);
	of_node_put(chip->node);
	kfree(chip);
	return 0;
}


/*
 * free the device
 */
static int snd_pmac_dev_free(struct snd_device *device)
{
	struct snd_pmac *chip = device->device_data;
	return snd_pmac_free(chip);
}


/*
 * check the machine support byteswap (little-endian)
 */

static void __init detect_byte_swap(struct snd_pmac *chip)
{
	struct device_node *mio;

	/* if seems that Keylargo can't byte-swap  */
	for (mio = chip->node->parent; mio; mio = mio->parent) {
		if (strcmp(mio->name, "mac-io") == 0) {
			if (of_device_is_compatible(mio, "Keylargo"))
				chip->can_byte_swap = 0;
			break;
		}
	}

	/* it seems the Pismo & iBook can't byte-swap in hardware. */
	if (machine_is_compatible("PowerBook3,1") ||
	    machine_is_compatible("PowerBook2,1"))
		chip->can_byte_swap = 0 ;

	if (machine_is_compatible("PowerBook2,1"))
		chip->can_duplex = 0;
}


/*
 * detect a sound chip
 */
static int __init snd_pmac_detect(struct snd_pmac *chip)
{
	struct device_node *sound;
	struct device_node *dn;
	const unsigned int *prop;
	unsigned int l;
	struct macio_chip* macio;

	if (!machine_is(powermac))
		return -ENODEV;

	chip->subframe = 0;
	chip->revision = 0;
	chip->freqs_ok = 0xff; /* all ok */
	chip->model = PMAC_AWACS;
	chip->can_byte_swap = 1;
	chip->can_duplex = 1;
	chip->can_capture = 1;
	chip->num_freqs = ARRAY_SIZE(awacs_freqs);
	chip->freq_table = awacs_freqs;
	chip->pdev = NULL;

	chip->control_mask = MASK_IEPC | MASK_IEE | 0x11; /* default */

	/* check machine type */
	if (machine_is_compatible("AAPL,3400/2400")
	    || machine_is_compatible("AAPL,3500"))
		chip->is_pbook_3400 = 1;
	else if (machine_is_compatible("PowerBook1,1")
		 || machine_is_compatible("AAPL,PowerBook1998"))
		chip->is_pbook_G3 = 1;
	chip->node = of_find_node_by_name(NULL, "awacs");
	sound = of_node_get(chip->node);

	/*
	 * powermac G3 models have a node called "davbus"
	 * with a child called "sound".