On Mon, Jan 04, 2016 at 01:31:38PM +0800, Wang Hongcheng wrote:
> As CSRT table will not always work, 2 arguments, base_request_line
> and num are added to acpi dma controller register
> as another way to get device request line.
>
> Signed-off-by: Wang Hongcheng <annie.wang@xxxxxxx>
> ---
> drivers/dma/acpi-dma.c | 25 ++++++++++++++++++++-----
> drivers/dma/dw/platform.c | 2 +-
> include/linux/acpi_dma.h | 6 ++++++
> 3 files changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c
> index 16d0daa..e2c27c3 100644
> --- a/drivers/dma/acpi-dma.c
> +++ b/drivers/dma/acpi-dma.c
> @@ -105,7 +105,7 @@ static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
> * We are using this table to get the request line range of the specific DMA
> * controller to be used later.
> */
> -static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> +static int acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> {
> struct acpi_csrt_group *grp, *end;
> struct acpi_table_csrt *csrt;
> @@ -117,7 +117,7 @@ static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> if (ACPI_FAILURE(status)) {
> if (status != AE_NOT_FOUND)
> dev_warn(&adev->dev, "failed to get the CSRT table\n");
> - return;
> + return -ENOENT;
> }
>
> grp = (struct acpi_csrt_group *)(csrt + 1);
> @@ -128,11 +128,12 @@ static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> if (ret < 0) {
> dev_warn(&adev->dev,
> "error in parsing resource group\n");
> - return;
> + return -EINVAL;
> }
>
> grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
> }
> + return 0;
> }
>
> /**
> @@ -140,6 +141,8 @@ static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> * @dev: struct device of DMA controller
> * @acpi_dma_xlate: translation function which converts a dma specifier
> * into a dma_chan structure
> + * @base_request_line: device request line base
> + * @num: device request line range
> * @data pointer to controller specific data to be used by
> * translation function
> *
> @@ -152,10 +155,13 @@ static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
> int acpi_dma_controller_register(struct device *dev,
> struct dma_chan *(*acpi_dma_xlate)
> (struct acpi_dma_spec *, struct acpi_dma *),
> + unsigned short base_request_line,
> + unsigned short num,
> void *data)
Can you instead provide custom acpi_dma_xlate when you register the DMA
controller? That function can then use whatever translation scheme is
suitable for your platform to get the correct channel.
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