linux-kernel - [PATCH v4 3/3] dmaengine: sun6i: share the dma driver with sun50i

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Date:   Sun, 20 Nov 2016 18:45:40 +0800
From:   Hao Zhang <hao5781286@...il.com>
To:     maxime.ripard@...e-electrons.com, wens@...e.org,
        dan.j.williams@...el.com, vinod.koul@...el.com,
        mark.rutland@....com, robh+dt@...nel.org, catalin.marinas@....com,
        will.deacon@....com
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        hao5781286@...il.com
Subject: [PATCH v4 3/3] dmaengine: sun6i: share the dma driver with sun50i

Changes the limited buswith to 8 bytes,and add
the test in sun6i_dma_config function

Accroding to sun6i dma driver, i think ,if the client
doesn't configure the address width with dmaengine_slave_config
function, it would use the default width. So we can add the test
in sun6i_dma_config function called by dmaengine_slave_config,
and test the configuration whether is support for the device.

Signed-off-by: Hao Zhang <hao5781286@...il.com>
---
 drivers/dma/sun6i-dma.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index a235878..f7c90b6 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -250,7 +250,7 @@ static inline s8 convert_burst(u32 maxburst)
 static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
 {
 	if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
-	    (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
+	    (addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES))
 		return -EINVAL;
 
 	return addr_width >> 1;
@@ -758,6 +758,18 @@ static int sun6i_dma_config(struct dma_chan *chan,
 {
 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
 
+	if ((BIT(config->src_addr_width) | chan->device->src_addr_widths) !=
+		chan->device->src_addr_widths) {
+		dev_err(chan2dev(chan), "Invalid DMA configuration\n");
+		return -EINVAL;
+	}
+
+	if ((BIT(config->dst_addr_width) | chan->device->dst_addr_widths) !=
+			chan->device->dst_addr_widths) {
+		dev_err(chan2dev(chan), "Invalid DMA configuration\n");
+		return -EINVAL;
+	}
+
 	memcpy(&vchan->cfg, config, sizeof(*config));
 
 	return 0;
@@ -1028,11 +1040,23 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
 	.nr_max_vchans   = 34,
 };
 
+/*
+ * The A64 has 8 physical channels, a maximum DRQ port id of 27,
+ * and a total of 38 usable source and destination endpoints.
+ */
+
+static struct sun6i_dma_config sun50i_a64_dma_cfg = {
+	.nr_max_channels = 8,
+	.nr_max_requests = 27,
+	.nr_max_vchans   = 38,
+};
+
 static const struct of_device_id sun6i_dma_match[] = {
 	{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
 	{ .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
 	{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
 	{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
+	{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun6i_dma_match);
@@ -1112,6 +1136,13 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 						  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 	sdc->slave.directions			= BIT(DMA_DEV_TO_MEM) |
 						  BIT(DMA_MEM_TO_DEV);
+
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun50i-a64-dma")) {
+		sdc->slave.src_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
+		sdc->slave.dst_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
+	}
+
 	sdc->slave.residue_granularity		= DMA_RESIDUE_GRANULARITY_BURST;
 	sdc->slave.dev = &pdev->dev;
 
-- 
2.7.4