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Commit 2335d338 authored by Sascha Hauer's avatar Sascha Hauer
Browse files

Merge branch 'dmaengine-sdma' into dmaengine

parents f8a356ff 23889c63

drivers/dma/imx-sdma.c

+35 −25
Original line number Diff line number Diff line
@@ -230,7 +230,7 @@ struct sdma_engine; 
 * struct sdma_channel - housekeeping for a SDMA channel

 *

 * @sdma		pointer to the SDMA engine for this channel

 * @channel		the channel number, matches dmaengine chan_id

 * @channel		the channel number, matches dmaengine chan_id + 1

 * @direction		transfer type. Needed for setting SDMA script

 * @peripheral_type	Peripheral type. Needed for setting SDMA script

 * @event_id0		aka dma request line
@@ -301,6 +301,7 @@ struct sdma_firmware_header { 


struct sdma_engine {

	struct device			*dev;

	struct device_dma_parameters	dma_parms;

	struct sdma_channel		channel[MAX_DMA_CHANNELS];

	struct sdma_channel_control	*channel_control;

	void __iomem			*regs;
@@ -798,7 +799,7 @@ static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) 


	cookie = sdma_assign_cookie(sdmac);



	sdma_enable_channel(sdma, tx->chan->chan_id);

	sdma_enable_channel(sdma, sdmac->channel);



	spin_unlock_irq(&sdmac->lock);
@@ -811,10 +812,6 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan) 
	struct imx_dma_data *data = chan->private;

	int prio, ret;



	/* No need to execute this for internal channel 0 */

	if (chan->chan_id == 0)

		return 0;



	if (!data)

		return -EINVAL;
@@ -879,7 +876,7 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( 
	struct sdma_channel *sdmac = to_sdma_chan(chan);

	struct sdma_engine *sdma = sdmac->sdma;

	int ret, i, count;

	int channel = chan->chan_id;

	int channel = sdmac->channel;

	struct scatterlist *sg;



	if (sdmac->status == DMA_IN_PROGRESS)
@@ -924,10 +921,24 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( 
			ret =  -EINVAL;

			goto err_out;

		}

		if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)



		switch (sdmac->word_size) {

		case DMA_SLAVE_BUSWIDTH_4_BYTES:

			bd->mode.command = 0;

		else

			bd->mode.command = sdmac->word_size;

			if (count & 3 || sg->dma_address & 3)

				return NULL;

			break;

		case DMA_SLAVE_BUSWIDTH_2_BYTES:

			bd->mode.command = 2;

			if (count & 1 || sg->dma_address & 1)

				return NULL;

			break;

		case DMA_SLAVE_BUSWIDTH_1_BYTE:

			bd->mode.command = 1;

			break;

		default:

			return NULL;

		}



		param = BD_DONE | BD_EXTD | BD_CONT;
@@ -963,7 +974,7 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( 
	struct sdma_channel *sdmac = to_sdma_chan(chan);

	struct sdma_engine *sdma = sdmac->sdma;

	int num_periods = buf_len / period_len;

	int channel = chan->chan_id;

	int channel = sdmac->channel;

	int ret, i = 0, buf = 0;



	dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
@@ -1237,7 +1248,6 @@ static int __init sdma_probe(struct platform_device *pdev) 
	struct resource *iores;

	struct sdma_platform_data *pdata = pdev->dev.platform_data;

	int i;

	dma_cap_mask_t mask;

	struct sdma_engine *sdma;



	sdma = kzalloc(sizeof(*sdma), GFP_KERNEL);
@@ -1280,6 +1290,9 @@ static int __init sdma_probe(struct platform_device *pdev) 


	sdma->version = pdata->sdma_version;



	dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);

	dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);



	INIT_LIST_HEAD(&sdma->dma_device.channels);

	/* Initialize channel parameters */

	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
@@ -1288,15 +1301,17 @@ static int __init sdma_probe(struct platform_device *pdev) 
		sdmac->sdma = sdma;

		spin_lock_init(&sdmac->lock);



		dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);

		dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);



		sdmac->chan.device = &sdma->dma_device;

		sdmac->chan.chan_id = i;

		sdmac->channel = i;



		/* Add the channel to the DMAC list */

		list_add_tail(&sdmac->chan.device_node, &sdma->dma_device.channels);

		/*

		 * Add the channel to the DMAC list. Do not add channel 0 though

		 * because we need it internally in the SDMA driver. This also means

		 * that channel 0 in dmaengine counting matches sdma channel 1.

		 */

		if (i)

			list_add_tail(&sdmac->chan.device_node,

					&sdma->dma_device.channels);

	}



	ret = sdma_init(sdma);
@@ -1317,6 +1332,8 @@ static int __init sdma_probe(struct platform_device *pdev) 
	sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;

	sdma->dma_device.device_control = sdma_control;

	sdma->dma_device.device_issue_pending = sdma_issue_pending;

	sdma->dma_device.dev->dma_parms = &sdma->dma_parms;

	dma_set_max_seg_size(sdma->dma_device.dev, 65535);



	ret = dma_async_device_register(&sdma->dma_device);

	if (ret) {
@@ -1324,13 +1341,6 @@ static int __init sdma_probe(struct platform_device *pdev) 
		goto err_init;

	}



	/* request channel 0. This is an internal control channel

	 * to the SDMA engine and not available to clients.

	 */

	dma_cap_zero(mask);

	dma_cap_set(DMA_SLAVE, mask);

	dma_request_channel(mask, NULL, NULL);



	dev_info(sdma->dev, "initialized\n");



	return 0;