Commit 516fd430 authored by Linus Walleij's avatar Linus Walleij Committed by Dan Williams
Browse files

DMAENGINE: COH 901 318 configure channel direction 



This makes the COH 901 318 configure channel direction (to or from
device) dynamically, instead of being passed in from the platform
data. This was necessary in order to get the MMC/SD-card channel
bidirectional (all other channels on the U300 were either RX or
TX but this one was both). This also sets memcpy() alignent to
even 2^2 (32bit) boundaries, which makes the memcpy() stress tests
start working.

Signed-off-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 0b58828c

drivers/dma/coh901318.c

+14 −0
Original line number Diff line number Diff line
@@ -928,6 +928,7 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 
	struct coh901318_chan *cohc = to_coh901318_chan(chan);

	struct coh901318_lli *data;

	struct coh901318_desc *cohd;

	const struct coh901318_params *params;

	struct scatterlist *sg;

	int len = 0;

	int size;
@@ -935,6 +936,7 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 
	u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained;

	u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;

	u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;

	u32 config;

	unsigned long flg;

	int ret;
@@ -952,10 +954,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 
		/* Trigger interrupt after last lli */

		ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;



	params = cohc_chan_param(cohc);

	config = params->config;



	if (direction == DMA_TO_DEVICE) {

		u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |

			COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE;



		config |= COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY;

		ctrl_chained |= tx_flags;

		ctrl_last |= tx_flags;

		ctrl |= tx_flags;
@@ -963,12 +969,15 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 
		u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST |

			COH901318_CX_CTRL_DST_ADDR_INC_ENABLE;



		config |= COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY;

		ctrl_chained |= rx_flags;

		ctrl_last |= rx_flags;

		ctrl |= rx_flags;

	} else

		goto err_direction;



	coh901318_set_conf(cohc, config);



	/* The dma only supports transmitting packages up to

	 * MAX_DMA_PACKET_SIZE. Calculate to total number of

	 * dma elemts required to send the entire sg list
@@ -1250,6 +1259,11 @@ static int __init coh901318_probe(struct platform_device *pdev) 
	base->dma_memcpy.device_issue_pending = coh901318_issue_pending;

	base->dma_memcpy.device_terminate_all = coh901318_terminate_all;

	base->dma_memcpy.dev = &pdev->dev;

	/*

	 * This controller can only access address at even 32bit boundaries,

	 * i.e. 2^2

	 */

	base->dma_memcpy.copy_align = 2;

	err = dma_async_device_register(&base->dma_memcpy);



	if (err)

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