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Subject[PATCH v2 04/10] dmaengine: sun6i: Enable additional burst lengths/widths on H3
Date
The H3 supports bursts lengths of 1, 4, 8 and 16 transfers, each with
a width of 1, 2, 4 or 8 bytes.

The register value for the the width is log2-encoded, change the
conversion function to provide the correct value for width == 8.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---
drivers/dma/sun6i-dma.c | 54 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 45 insertions(+), 9 deletions(-)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 663f4b0b450e..f2ee914cd755 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -120,6 +120,8 @@ struct sun6i_dma_config {
void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
u32 src_burst_lengths;
u32 dst_burst_lengths;
+ u32 src_addr_widths;
+ u32 dst_addr_widths;
};

/*
@@ -259,8 +261,12 @@ static inline s8 convert_burst(u32 maxburst)
switch (maxburst) {
case 1:
return 0;
+ case 4:
+ return 1;
case 8:
return 2;
+ case 16:
+ return 3;
default:
return -EINVAL;
}
@@ -268,7 +274,7 @@ static inline s8 convert_burst(u32 maxburst)

static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
{
- return addr_width >> 1;
+ return ilog2(addr_width);
}

static void sun6i_enable_clock_autogate_noop(struct sun6i_dma_dev *sdev)
@@ -1045,6 +1051,12 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = {
.set_burst_length = sun6i_set_burst_length_a31;
.src_burst_lengths = BIT(1) | BIT(8);
.dst_burst_lengths = BIT(1) | BIT(8);
+ .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
};

/*
@@ -1060,6 +1072,12 @@ static struct sun6i_dma_config sun8i_a23_dma_cfg = {
.set_burst_length = sun6i_set_burst_length_a31;
.src_burst_lengths = BIT(1) | BIT(8);
.dst_burst_lengths = BIT(1) | BIT(8);
+ .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
};

static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
@@ -1070,11 +1088,19 @@ static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
.set_burst_length = sun6i_set_burst_length_a31;
.src_burst_lengths = BIT(1) | BIT(8);
.dst_burst_lengths = BIT(1) | BIT(8);
+ .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
};

/*
* The H3 has 12 physical channels, a maximum DRQ port id of 27,
* and a total of 34 usable source and destination endpoints.
+ * It also supports additional burst lengths and bus widths,
+ * and the burst length fields have different offsets.
*/

static struct sun6i_dma_config sun8i_h3_dma_cfg = {
@@ -1083,8 +1109,16 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
.nr_max_vchans = 34,
.clock_autogate_enable = sun6i_enable_clock_autogate_h3;
.set_burst_length = sun6i_set_burst_length_h3;
- .src_burst_lengths = BIT(1) | BIT(8);
- .dst_burst_lengths = BIT(1) | BIT(8);
+ .src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16);
+ .dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16);
+ .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
+ .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
};

/*
@@ -1100,6 +1134,12 @@ static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
.set_burst_length = sun6i_set_burst_length_a31;
.src_burst_lengths = BIT(1) | BIT(8);
.dst_burst_lengths = BIT(1) | BIT(8);
+ .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
};

static const struct of_device_id sun6i_dma_match[] = {
@@ -1179,12 +1219,8 @@ static int sun6i_dma_probe(struct platform_device *pdev)
sdc->slave.device_pause = sun6i_dma_pause;
sdc->slave.device_resume = sun6i_dma_resume;
sdc->slave.device_terminate_all = sun6i_dma_terminate_all;
- sdc->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
- BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
- BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
- sdc->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
- BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
- BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ sdc->slave.src_addr_widths = sdc->cfg->src_addr_widths;
+ sdc->slave.dst_addr_widths = sdc->cfg->dst_addr_widths;
sdc->slave.directions = BIT(DMA_DEV_TO_MEM) |
BIT(DMA_MEM_TO_DEV);
sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
--
2.14.1
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