On 10/11/2020 06:28, Frank Lee wrote:
Hi,
> From: Yangtao Li <fr...@allwinnertech.com>
>
> The dma of a100 is similar to h6, with some minor changes to
> support greater addressing capabilities.
So apparently those changes are backwards compatible, right?
Why do we need then a new struct now, when this is actually identical to
the existing H6 one?
So as this seems to work with the same settings as the H6, I think we
don't need any change in the driver at the moment, just using the H6
compatible as a fallback in the .dtsi.
Cheers,
Andre
P.S. I understand that Vinod already applied it, and it doesn't hurt to
have that in at the moment, if we fix the compatible usage.
>
> Add support for it.>
> Signed-off-by: Yangtao Li <fr...@allwinnertech.com>
> ---
> drivers/dma/sun6i-dma.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index f5f9c86c50bc..5cadd4d2b824 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -1173,6 +1173,30 @@ static struct sun6i_dma_config sun50i_a64_dma_cfg = {
> BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
> };
>
> +/*
> + * TODO: Add support for more than 4g physical addressing.
> + *
> + * The A100 binding uses the number of dma channels from the
> + * device tree node.
> + */
> +static struct sun6i_dma_config sun50i_a100_dma_cfg = {
> + .clock_autogate_enable = sun6i_enable_clock_autogate_h3,
> + .set_burst_length = sun6i_set_burst_length_h3,
> + .set_drq = sun6i_set_drq_h6,
> + .set_mode = sun6i_set_mode_h6,
> + .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),
> + .has_mbus_clk = true,
> +};
> +
> /*
> * The H6 binding uses the number of dma channels from the
> * device tree node.
> @@ -1225,6 +1249,7 @@ static const struct of_device_id sun6i_dma_match[] = {
> { .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
> { .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
> { .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg
> },
> + { .compatible = "allwinner,sun50i-a100-dma", .data =
> &sun50i_a100_dma_cfg },
> { .compatible = "allwinner,sun50i-h6-dma", .data = &sun50i_h6_dma_cfg },
> { /* sentinel */ }
> };
>
