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dmaengine: rcar-dmac: Add dma-channel-mask property support
This patch adds dma-channel-mask property support not to reserve some DMA channels for some reasons. (for example: a heterogeneous CPU uses it.) Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/1568010892-17606-5-git-send-email-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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1 changed files with 9 additions and 1 deletions
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@ -203,7 +203,7 @@ struct rcar_dmac {
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unsigned int n_channels;
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unsigned int n_channels;
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struct rcar_dmac_chan *channels;
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struct rcar_dmac_chan *channels;
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unsigned int channels_mask;
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u32 channels_mask;
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DECLARE_BITMAP(modules, 256);
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DECLARE_BITMAP(modules, 256);
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};
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};
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@ -1810,7 +1810,15 @@ static int rcar_dmac_parse_of(struct device *dev, struct rcar_dmac *dmac)
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return -EINVAL;
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return -EINVAL;
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}
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}
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/*
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* If the driver is unable to read dma-channel-mask property,
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* the driver assumes that it can use all channels.
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*/
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dmac->channels_mask = GENMASK(dmac->n_channels - 1, 0);
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dmac->channels_mask = GENMASK(dmac->n_channels - 1, 0);
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of_property_read_u32(np, "dma-channel-mask", &dmac->channels_mask);
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/* If the property has out-of-channel mask, this driver clears it */
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dmac->channels_mask &= GENMASK(dmac->n_channels - 1, 0);
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return 0;
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return 0;
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}
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}
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