Commit 9862ba17 authored by Russell King's avatar Russell King
Browse files

dmaengine: PL08x: extract function to to generate cctl values 



Extract the functionality from dma_slave_config to generate the cctl
values for a given bus width and burst size.  This allows us to use
this elsewhere in the driver, namely the prepare functions.

Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 409ec8db

drivers/dma/amba-pl08x.c

+32 −21
Original line number Diff line number Diff line
@@ -1207,14 +1207,40 @@ static u32 pl08x_burst(u32 maxburst) 
	return burst_sizes[i].reg;

}



static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan,

	enum dma_slave_buswidth addr_width, u32 maxburst)

{

	u32 width, burst, cctl = 0;



	width = pl08x_width(addr_width);

	if (width == ~0)

		return ~0;



	cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;

	cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;



	/*

	 * If this channel will only request single transfers, set this

	 * down to ONE element.  Also select one element if no maxburst

	 * is specified.

	 */

	if (plchan->cd->single)

		maxburst = 1;



	burst = pl08x_burst(maxburst);

	cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;

	cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;



	return pl08x_cctl(cctl);

}



static int dma_set_runtime_config(struct dma_chan *chan,

				  struct dma_slave_config *config)

{

	struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);

	struct pl08x_driver_data *pl08x = plchan->host;

	enum dma_slave_buswidth addr_width;

	u32 width, burst, maxburst;

	u32 cctl = 0;

	u32 maxburst, cctl = 0;



	if (!plchan->slave)

		return -EINVAL;
@@ -1233,8 +1259,8 @@ static int dma_set_runtime_config(struct dma_chan *chan, 
		return -EINVAL;

	}



	width = pl08x_width(addr_width);

	if (width == ~0) {

	cctl = pl08x_get_cctl(plchan, addr_width, maxburst);

	if (cctl == ~0) {

		dev_err(&pl08x->adev->dev,

			"bad runtime_config: alien address width\n");

		return -EINVAL;
@@ -1242,25 +1268,10 @@ static int dma_set_runtime_config(struct dma_chan *chan, 


	plchan->cfg = *config;



	cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;

	cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;



	/*

	 * If this channel will only request single transfers, set this

	 * down to ONE element.  Also select one element if no maxburst

	 * is specified.

	 */

	if (plchan->cd->single)

		maxburst = 1;



	burst = pl08x_burst(maxburst);

	cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;

	cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;



	if (plchan->runtime_direction == DMA_DEV_TO_MEM) {

		plchan->src_cctl = pl08x_cctl(cctl);

		plchan->src_cctl = cctl;

	} else {

		plchan->dst_cctl = pl08x_cctl(cctl);

		plchan->dst_cctl = cctl;

	}



	dev_dbg(&pl08x->adev->dev,

CRA Git | Maintained and supported by SUSTech CRA and CCSE