snd_ps3.c

linux 内核源代码

	return ret;
};

static int snd_ps3_pcm_close(struct snd_pcm_substream *substream)
{
	/* mute on */
	snd_ps3_mute(1);
	return 0;
};

static void snd_ps3_audio_fixup(struct snd_ps3_card_info *card)
{
	/*
	 * avsetting driver seems to never change the followings
	 * so, init them here once
	 */

	/* no dma interrupt needed */
	write_reg(PS3_AUDIO_INTR_EN_0, 0);

	/* use every 4 buffer empty interrupt */
	update_mask_reg(PS3_AUDIO_AX_IC,
			PS3_AUDIO_AX_IC_AASOIMD_MASK,
			PS3_AUDIO_AX_IC_AASOIMD_EVERY4);

	/* enable 3wire clocks */
	update_mask_reg(PS3_AUDIO_AO_3WMCTRL,
			~(PS3_AUDIO_AO_3WMCTRL_ASOBCLKD_DISABLED |
			  PS3_AUDIO_AO_3WMCTRL_ASOLRCKD_DISABLED),
			0);
	update_reg(PS3_AUDIO_AO_3WMCTRL,
		   PS3_AUDIO_AO_3WMCTRL_ASOPLRCK_DEFAULT);
}

/*
 * av setting
 * NOTE: calling this function may generate audio interrupt.
 */
static int snd_ps3_change_avsetting(struct snd_ps3_card_info *card)
{
	int ret, retries, i;
	pr_debug("%s: start\n", __func__);

	ret = ps3av_set_audio_mode(card->avs.avs_audio_ch,
				  card->avs.avs_audio_rate,
				  card->avs.avs_audio_width,
				  card->avs.avs_audio_format,
				  card->avs.avs_audio_source);
	/*
	 * Reset the following unwanted settings:
	 */

	/* disable all 3wire buffers */
	update_mask_reg(PS3_AUDIO_AO_3WMCTRL,
			~(PS3_AUDIO_AO_3WMCTRL_ASOEN(0) |
			  PS3_AUDIO_AO_3WMCTRL_ASOEN(1) |
			  PS3_AUDIO_AO_3WMCTRL_ASOEN(2) |
			  PS3_AUDIO_AO_3WMCTRL_ASOEN(3)),
			0);
	wmb(); 	/* ensure the hardware sees the change */
	/* wait for actually stopped */
	retries = 1000;
	while ((read_reg(PS3_AUDIO_AO_3WMCTRL) &
		(PS3_AUDIO_AO_3WMCTRL_ASORUN(0) |
		 PS3_AUDIO_AO_3WMCTRL_ASORUN(1) |
		 PS3_AUDIO_AO_3WMCTRL_ASORUN(2) |
		 PS3_AUDIO_AO_3WMCTRL_ASORUN(3))) &&
	       --retries) {
		udelay(1);
	}

	/* reset buffer pointer */
	for (i = 0; i < 4; i++) {
		update_reg(PS3_AUDIO_AO_3WCTRL(i),
			   PS3_AUDIO_AO_3WCTRL_ASOBRST_RESET);
		udelay(10);
	}
	wmb(); /* ensure the hardware actually start resetting */

	/* enable 3wire#0 buffer */
	update_reg(PS3_AUDIO_AO_3WMCTRL, PS3_AUDIO_AO_3WMCTRL_ASOEN(0));


	/* In 24bit mode,ALSA inserts a zero byte at first byte of per sample */
	update_mask_reg(PS3_AUDIO_AO_3WCTRL(0),
			~PS3_AUDIO_AO_3WCTRL_ASODF,
			PS3_AUDIO_AO_3WCTRL_ASODF_LSB);
	update_mask_reg(PS3_AUDIO_AO_SPDCTRL(0),
			~PS3_AUDIO_AO_SPDCTRL_SPODF,
			PS3_AUDIO_AO_SPDCTRL_SPODF_LSB);
	/* ensure all the setting above is written back to register */
	wmb();
	/* avsetting driver altered AX_IE, caller must reset it if you want */
	pr_debug("%s: end\n", __func__);
	return ret;
}

static int snd_ps3_init_avsetting(struct snd_ps3_card_info *card)
{
	int ret;
	pr_debug("%s: start\n", __func__);
	card->avs.avs_audio_ch = PS3AV_CMD_AUDIO_NUM_OF_CH_2;
	card->avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_48K;
	card->avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_16;
	card->avs.avs_audio_format = PS3AV_CMD_AUDIO_FORMAT_PCM;
	card->avs.avs_audio_source = PS3AV_CMD_AUDIO_SOURCE_SERIAL;

	ret = snd_ps3_change_avsetting(card);

	snd_ps3_audio_fixup(card);

	/* to start to generate SPDIF signal, fill data */
	snd_ps3_program_dma(card, SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
	snd_ps3_kick_dma(card);
	pr_debug("%s: end\n", __func__);
	return ret;
}

/*
 *  set sampling rate according to the substream
 */
static int snd_ps3_set_avsetting(struct snd_pcm_substream *substream)
{
	struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
	struct snd_ps3_avsetting_info avs;

	avs = card->avs;

	pr_debug("%s: called freq=%d width=%d\n", __func__,
		 substream->runtime->rate,
		 snd_pcm_format_width(substream->runtime->format));

	pr_debug("%s: before freq=%d width=%d\n", __func__,
		 card->avs.avs_audio_rate, card->avs.avs_audio_width);

	/* sample rate */
	switch (substream->runtime->rate) {
	case 44100:
		avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_44K;
		break;
	case 48000:
		avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_48K;
		break;
	case 88200:
		avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_88K;
		break;
	case 96000:
		avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_96K;
		break;
	default:
		pr_info("%s: invalid rate %d\n", __func__,
			substream->runtime->rate);
		return 1;
	}

	/* width */
	switch (snd_pcm_format_width(substream->runtime->format)) {
	case 16:
		avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_16;
		break;
	case 24:
		avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_24;
		break;
	default:
		pr_info("%s: invalid width %d\n", __func__,
			snd_pcm_format_width(substream->runtime->format));
		return 1;
	}

	if ((card->avs.avs_audio_width != avs.avs_audio_width) ||
	    (card->avs.avs_audio_rate != avs.avs_audio_rate)) {
		card->avs = avs;
		snd_ps3_change_avsetting(card);

		pr_debug("%s: after freq=%d width=%d\n", __func__,
			 card->avs.avs_audio_rate, card->avs.avs_audio_width);

		return 0;
	} else
		return 1;
}



static int snd_ps3_map_mmio(void)
{
	the_card.mapped_mmio_vaddr =
		ioremap(the_card.ps3_dev->m_region->bus_addr,
			the_card.ps3_dev->m_region->len);

	if (!the_card.mapped_mmio_vaddr) {
		pr_info("%s: ioremap 0 failed p=%#lx l=%#lx \n",
		       __func__, the_card.ps3_dev->m_region->lpar_addr,
		       the_card.ps3_dev->m_region->len);
		return -ENXIO;
	}

	return 0;
};

static void snd_ps3_unmap_mmio(void)
{
	iounmap(the_card.mapped_mmio_vaddr);
	the_card.mapped_mmio_vaddr = NULL;
}

static int snd_ps3_allocate_irq(void)
{
	int ret;
	u64 lpar_addr, lpar_size;
	u64 __iomem *mapped;

	/* FIXME: move this to device_init (H/W probe) */

	/* get irq outlet */
	ret = lv1_gpu_device_map(1, &lpar_addr, &lpar_size);
	if (ret) {
		pr_info("%s: device map 1 failed %d\n", __func__,
			ret);
		return -ENXIO;
	}

	mapped = ioremap(lpar_addr, lpar_size);
	if (!mapped) {
		pr_info("%s: ioremap 1 failed \n", __func__);
		return -ENXIO;
	}

	the_card.audio_irq_outlet = in_be64(mapped);

	iounmap(mapped);
	ret = lv1_gpu_device_unmap(1);
	if (ret)
		pr_info("%s: unmap 1 failed\n", __func__);

	/* irq */
	ret = ps3_irq_plug_setup(PS3_BINDING_CPU_ANY,
				 the_card.audio_irq_outlet,
				 &the_card.irq_no);
	if (ret) {
		pr_info("%s:ps3_alloc_irq failed (%d)\n", __func__, ret);
		return ret;
	}

	ret = request_irq(the_card.irq_no, snd_ps3_interrupt, IRQF_DISABLED,
			  SND_PS3_DRIVER_NAME, &the_card);
	if (ret) {
		pr_info("%s: request_irq failed (%d)\n", __func__, ret);
		goto cleanup_irq;
	}

	return 0;

 cleanup_irq:
	ps3_irq_plug_destroy(the_card.irq_no);
	return ret;
};

static void snd_ps3_free_irq(void)
{
	free_irq(the_card.irq_no, &the_card);
	ps3_irq_plug_destroy(the_card.irq_no);
}

static void snd_ps3_audio_set_base_addr(uint64_t ioaddr_start)
{
	uint64_t val;
	int ret;

	val = (ioaddr_start & (0x0fUL << 32)) >> (32 - 20) |
		(0x03UL << 24) |
		(0x0fUL << 12) |
		(PS3_AUDIO_IOID);

	ret = lv1_gpu_attribute(0x100, 0x007, val, 0, 0);
	if (ret)
		pr_info("%s: gpu_attribute failed %d\n", __func__,
			ret);
}

static int __init snd_ps3_driver_probe(struct ps3_system_bus_device *dev)
{
	int ret;
	u64 lpar_addr, lpar_size;

	BUG_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1));
	BUG_ON(dev->match_id != PS3_MATCH_ID_SOUND);

	the_card.ps3_dev = dev;

	ret = ps3_open_hv_device(dev);

	if (ret)
		return -ENXIO;

	/* setup MMIO */
	ret = lv1_gpu_device_map(2, &lpar_addr, &lpar_size);
	if (ret) {
		pr_info("%s: device map 2 failed %d\n", __func__, ret);
		goto clean_open;
	}
	ps3_mmio_region_init(dev, dev->m_region, lpar_addr, lpar_size,
		PAGE_SHIFT);

	ret = snd_ps3_map_mmio();
	if (ret)
		goto clean_dev_map;

	/* setup DMA area */
	ps3_dma_region_init(dev, dev->d_region,
			    PAGE_SHIFT, /* use system page size */
			    0, /* dma type; not used */
			    NULL,
			    _ALIGN_UP(SND_PS3_DMA_REGION_SIZE, PAGE_SIZE));
	dev->d_region->ioid = PS3_AUDIO_IOID;

	ret = ps3_dma_region_create(dev->d_region);
	if (ret) {
		pr_info("%s: region_create\n", __func__);
		goto clean_mmio;
	}

	snd_ps3_audio_set_base_addr(dev->d_region->bus_addr);

	/* CONFIG_SND_PS3_DEFAULT_START_DELAY */
	the_card.start_delay = snd_ps3_start_delay;

	/* irq */
	if (snd_ps3_allocate_irq()) {
		ret = -ENXIO;
		goto clean_dma_region;
	}

	/* create card instance */
	the_card.card = snd_card_new(index, id, THIS_MODULE, 0);
	if (!the_card.card) {
		ret = -ENXIO;
		goto clean_irq;
	}

	strcpy(the_card.card->driver, "PS3");
	strcpy(the_card.card->shortname, "PS3");
	strcpy(the_card.card->longname, "PS3 sound");
	/* create PCM devices instance */
	/* NOTE:this driver works assuming pcm:substream = 1:1 */
	ret = snd_pcm_new(the_card.card,
			  "SPDIF",
			  0, /* instance index, will be stored pcm.device*/
			  1, /* output substream */
			  0, /* input substream */
			  &(the_card.pcm));
	if (ret)
		goto clean_card;

	the_card.pcm->private_data = &the_card;
	strcpy(the_card.pcm->name, "SPDIF");

	/* set pcm ops */
	snd_pcm_set_ops(the_card.pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_ps3_pcm_spdif_ops);

	the_card.pcm->info_flags = SNDRV_PCM_INFO_NONINTERLEAVED;
	/* pre-alloc PCM DMA buffer*/
	ret = snd_pcm_lib_preallocate_pages_for_all(the_card.pcm,
					SNDRV_DMA_TYPE_DEV,
					&dev->core,
					SND_PS3_PCM_PREALLOC_SIZE,
					SND_PS3_PCM_PREALLOC_SIZE);
	if (ret < 0) {
		pr_info("%s: prealloc failed\n", __func__);
		goto clean_card;
	}

	/*
	 * allocate null buffer
	 * its size should be lager than PS3_AUDIO_FIFO_STAGE_SIZE * 2
	 * PAGE_SIZE is enogh
	 */
	if (!(the_card.null_buffer_start_vaddr =
	      dma_alloc_coherent(&the_card.ps3_dev->core,
				 PAGE_SIZE,
				 &the_card.null_buffer_start_dma_addr,
				 GFP_KERNEL))) {
		pr_info("%s: nullbuffer alloc failed\n", __func__);
		goto clean_preallocate;
	}
	pr_debug("%s: null vaddr=%p dma=%#lx\n", __func__,
		 the_card.null_buffer_start_vaddr,
		 the_card.null_buffer_start_dma_addr);
	/* set default sample rate/word width */
	snd_ps3_init_avsetting(&the_card);

	/* register the card */
	ret = snd_card_register(the_card.card);
	if (ret < 0)
		goto clean_dma_map;

	pr_info("%s started. start_delay=%dms\n",
		the_card.card->longname, the_card.start_delay);
	return 0;

clean_dma_map:
	dma_free_coherent(&the_card.ps3_dev->core,
			  PAGE_SIZE,
			  the_card.null_buffer_start_vaddr,
			  the_card.null_buffer_start_dma_addr);
clean_preallocate:
	snd_pcm_lib_preallocate_free_for_all(the_card.pcm);
clean_card:
	snd_card_free(the_card.card);
clean_irq:
	snd_ps3_free_irq();
clean_dma_region:
	ps3_dma_region_free(dev->d_region);
clean_mmio:
	snd_ps3_unmap_mmio();
clean_dev_map:
	lv1_gpu_device_unmap(2);
clean_open:
	ps3_close_hv_device(dev);
	/*
	 * there is no destructor function to pcm.
	 * midlayer automatically releases if the card removed
	 */
	return ret;
}; /* snd_ps3_probe */

/* called when module removal */
static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
{
	int ret;
	pr_info("%s:start id=%d\n", __func__,  dev->match_id);
	if (dev->match_id != PS3_MATCH_ID_SOUND)
		return -ENXIO;

	/*
	 * ctl and preallocate buffer will be freed in
	 * snd_card_free
	 */
	ret = snd_card_free(the_card.card);
	if (ret)
		pr_info("%s: ctl freecard=%d\n", __func__, ret);

	dma_free_coherent(&dev->core,
			  PAGE_SIZE,
			  the_card.null_buffer_start_vaddr,
			  the_card.null_buffer_start_dma_addr);

	ps3_dma_region_free(dev->d_region);

	snd_ps3_free_irq();
	snd_ps3_unmap_mmio();

	lv1_gpu_device_unmap(2);
	ps3_close_hv_device(dev);
	pr_info("%s:end id=%d\n", __func__, dev->match_id);
	return 0;
} /* snd_ps3_remove */

static struct ps3_system_bus_driver snd_ps3_bus_driver_info = {
	.match_id = PS3_MATCH_ID_SOUND,
	.probe = snd_ps3_driver_probe,
	.remove = snd_ps3_driver_remove,
	.shutdown = snd_ps3_driver_remove,
	.core = {
		.name = SND_PS3_DRIVER_NAME,
		.owner = THIS_MODULE,
	},
};


/*
 * Interrupt handler
 */
static irqreturn_t snd_ps3_interrupt(int irq, void *dev_id)
{

	uint32_t port_intr;
	int underflow_occured = 0;
	struct snd_ps3_card_info *card = dev_id;

	if (!card->running) {
		update_reg(PS3_AUDIO_AX_IS, 0);
		update_reg(PS3_AUDIO_INTR_0, 0);
		return IRQ_HANDLED;
	}

	port_intr = read_reg(PS3_AUDIO_AX_IS);
	/*
	 *serial buffer empty detected (every 4 times),
	 *program next dma and kick it
	 */
	if (port_intr & PS3_AUDIO_AX_IE_ASOBEIE(0)) {
		write_reg(PS3_AUDIO_AX_IS, PS3_AUDIO_AX_IE_ASOBEIE(0));
		if (port_intr & PS3_AUDIO_AX_IE_ASOBUIE(0)) {
			write_reg(PS3_AUDIO_AX_IS, port_intr);
			underflow_occured = 1;
		}
		if (card->silent) {
			/* we are still in silent time */
			snd_ps3_program_dma(card,
				(underflow_occured) ?
				SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL :
				SND_PS3_DMA_FILLTYPE_SILENT_RUNNING);
			snd_ps3_kick_dma(card);
			card->silent --;
		} else {
			snd_ps3_program_dma(card,
				(underflow_occured) ?
				SND_PS3_DMA_FILLTYPE_FIRSTFILL :
				SND_PS3_DMA_FILLTYPE_RUNNING);
			snd_ps3_kick_dma(card);
			snd_pcm_period_elapsed(card->substream);
		}
	} else if (port_intr & PS3_AUDIO_AX_IE_ASOBUIE(0)) {
		write_reg(PS3_AUDIO_AX_IS, PS3_AUDIO_AX_IE_ASOBUIE(0));
		/*
		 * serial out underflow, but buffer empty not detected.
		 * in this case, fill fifo with 0 to recover.  After
		 * filling dummy data, serial automatically start to
		 * consume them and then will generate normal buffer
		 * empty interrupts.
		 * If both buffer underflow and buffer empty are occured,
		 * it is better to do nomal data transfer than empty one
		 */
		snd_ps3_program_dma(card,
				    SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
		snd_ps3_kick_dma(card);
		snd_ps3_program_dma(card,
				    SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
		snd_ps3_kick_dma(card);
	}
	/* clear interrupt cause */
	return IRQ_HANDLED;
};

/*
 * module/subsystem initialize/terminate
 */
static int __init snd_ps3_init(void)
{
	int ret;

	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
		return -ENXIO;

	memset(&the_card, 0, sizeof(the_card));
	spin_lock_init(&the_card.dma_lock);

	/* register systembus DRIVER, this calls our probe() func */
	ret = ps3_system_bus_driver_register(&snd_ps3_bus_driver_info);

	return ret;
}

static void __exit snd_ps3_exit(void)
{
	ps3_system_bus_driver_unregister(&snd_ps3_bus_driver_info);
}

MODULE_ALIAS(PS3_MODULE_ALIAS_SOUND);