From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Subject: [PATCH v2 3/3] dmaengine: rcar-dmac: Add dma-channel-mask property support
Date: Wed, 4 Sep 2019 17:24:38 +0900 [thread overview]
Message-ID: <1567585478-23902-4-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw)
In-Reply-To: <1567585478-23902-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>
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>
---
drivers/dma/sh/rcar-dmac.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 542786d..f06016d 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -203,7 +203,7 @@ struct rcar_dmac {
unsigned int n_channels;
struct rcar_dmac_chan *channels;
- unsigned int channels_mask;
+ u32 channels_mask;
DECLARE_BITMAP(modules, 256);
};
@@ -1810,7 +1810,15 @@ static int rcar_dmac_parse_of(struct device *dev, struct rcar_dmac *dmac)
return -EINVAL;
}
+ /*
+ * If the driver is unable to read dma-channel-mask property,
+ * the driver assumes that it can use all channels.
+ */
dmac->channels_mask = GENMASK(dmac->n_channels - 1, 0);
+ of_property_read_u32(np, "dma-channel-mask", &dmac->channels_mask);
+
+ /* If the property has out-of-channel mask, this driver clears it */
+ dmac->channels_mask &= GENMASK(dmac->n_channels - 1, 0);
return 0;
}
--
2.7.4
next prev parent reply other threads:[~2019-09-04 8:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-04 8:24 [PATCH v2 0/3] dmaengine: rcar-dmac: use of_data and add dma-channel-mask support Yoshihiro Shimoda
2019-09-04 8:24 ` [PATCH v2 1/3] dmaengine: rcar-dmac: Use of_data values instead of a macro Yoshihiro Shimoda
2019-09-04 8:24 ` [PATCH v2 2/3] dmaengine: rcar-dmac: Use devm_platform_ioremap_resource() Yoshihiro Shimoda
2019-09-04 8:24 ` Yoshihiro Shimoda [this message]
2019-09-04 9:36 ` [PATCH v2 0/3] dmaengine: rcar-dmac: use of_data and add dma-channel-mask support Vinod Koul
2019-09-04 10:08 ` Yoshihiro Shimoda
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