Commit 420c0117 authored by Robert Jarzmik's avatar Robert Jarzmik
Browse files

dmaengine: pxa: use a dma slave map 



In order to remove the specific knowledge of the dma mapping from PXA
drivers, add a default slave map for pxa architectures.

This won't impact MMP architecture, but is aimed only at all PXA boards.

This is the first step, and once all drivers are converted,
pxad_filter_fn() will be made static, and the DMA resources removed from
device.c.

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Reported-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarVinod Koul <vkoul@kernel.org>
parent ce397d21

drivers/dma/pxa_dma.c

+9 −1
Original line number Diff line number Diff line
@@ -179,6 +179,8 @@ static unsigned int pxad_drcmr(unsigned int line) 
	return 0x1000 + line * 4;

}



bool pxad_filter_fn(struct dma_chan *chan, void *param);



/*

 * Debug fs

 */
@@ -1396,9 +1398,10 @@ static int pxad_probe(struct platform_device *op) 
{

	struct pxad_device *pdev;

	const struct of_device_id *of_id;

	const struct dma_slave_map *slave_map = NULL;

	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);

	struct resource *iores;

	int ret, dma_channels = 0, nb_requestors = 0;

	int ret, dma_channels = 0, nb_requestors = 0, slave_map_cnt = 0;

	const enum dma_slave_buswidth widths =

		DMA_SLAVE_BUSWIDTH_1_BYTE   | DMA_SLAVE_BUSWIDTH_2_BYTES |

		DMA_SLAVE_BUSWIDTH_4_BYTES;
@@ -1429,6 +1432,8 @@ static int pxad_probe(struct platform_device *op) 
	} else if (pdata && pdata->dma_channels) {

		dma_channels = pdata->dma_channels;

		nb_requestors = pdata->nb_requestors;

		slave_map = pdata->slave_map;

		slave_map_cnt = pdata->slave_map_cnt;

	} else {

		dma_channels = 32;	/* default 32 channel */

	}
@@ -1440,6 +1445,9 @@ static int pxad_probe(struct platform_device *op) 
	pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy;

	pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg;

	pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic;

	pdev->slave.filter.map = slave_map;

	pdev->slave.filter.mapcnt = slave_map_cnt;

	pdev->slave.filter.fn = pxad_filter_fn;



	pdev->slave.copy_align = PDMA_ALIGNMENT;

	pdev->slave.src_addr_widths = widths;

include/linux/platform_data/mmp_dma.h

+4 −0
Original line number Diff line number Diff line
@@ -12,9 +12,13 @@ 
#ifndef MMP_DMA_H

#define MMP_DMA_H



struct dma_slave_map;



struct mmp_dma_platdata {

	int dma_channels;

	int nb_requestors;

	int slave_map_cnt;

	const struct dma_slave_map *slave_map;

};



#endif /* MMP_DMA_H */

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