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dmaengine: axi-dmac: wrap channel parameter adjust into function 

The channel parameters (which are read from the device-tree) are adjusted
for the DMAEngine framework in the axi_dmac_parse_chan_dt() function, after
they are read from the device-tree.

When we want to read these from registers, we will need to use the same
logic, so this change splits the logic into a separate function.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20200825151950.57605-6-alexandru.ardelean@analog.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Alexandru Ardelean 2020-08-25 18:19:49 +03:00 committed by Vinod Koul
parent 06b6e88c7e
commit 3061a65c1b
1 changed files with 15 additions and 10 deletions
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25
drivers/dma/dma-axi-dmac.c
View File

@ -717,6 +717,20 @@ static const struct regmap_config axi_dmac_regmap_config = {
.writeable_reg = axi_dmac_regmap_rdwr,
};
static void axi_dmac_adjust_chan_params(struct axi_dmac_chan *chan)
{
chan->address_align_mask = max(chan->dest_width, chan->src_width) - 1;
if (axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_MEM;
else if (!axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_DEV;
else if (axi_dmac_dest_is_mem(chan) && !axi_dmac_src_is_mem(chan))
chan->direction = DMA_DEV_TO_MEM;
else
chan->direction = DMA_DEV_TO_DEV;
}
/*
* The configuration stored in the devicetree matches the configuration
* parameters of the peripheral instance and allows the driver to know which
@ -760,16 +774,7 @@ static int axi_dmac_parse_chan_dt(struct device_node *of_chan,
return ret;
chan->dest_width = val / 8;
chan->address_align_mask = max(chan->dest_width, chan->src_width) - 1;
if (axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_MEM;
else if (!axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_DEV;
else if (axi_dmac_dest_is_mem(chan) && !axi_dmac_src_is_mem(chan))
chan->direction = DMA_DEV_TO_MEM;
else
chan->direction = DMA_DEV_TO_DEV;
axi_dmac_adjust_chan_params(chan);
return 0;
}