Hi Andy,
Thanks for the patch.
On 02/25/2014 01:11 AM, Andy Gross wrote:
> Add the DMA engine driver for the QCOM Bus Access Manager (BAM) DMA controller
> found in the MSM 8x74 platforms.
>
> Each BAM DMA device is associated with a specific on-chip peripheral. Each
> channel provides a uni-directional data transfer engine that is capable of
> transferring data between the peripheral and system memory (System mode), or
> between two peripherals (BAM2BAM).
>
> The initial release of this driver only supports slave transfers between
> peripherals and system memory.
>
> Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx>
> ---
> drivers/dma/Kconfig | 9 +
> drivers/dma/Makefile | 1 +
> drivers/dma/qcom_bam_dma.c | 1106 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1116 insertions(+)
> create mode 100644 drivers/dma/qcom_bam_dma.c
<snip>
> +
> +/**
> + * bam_init
> + * @bdev: bam device
> + *
> + * Initialization helper for global bam registers
> + */
> +static int bam_init(struct bam_device *bdev)
> +{
> + u32 val;
> +
> + /* read revision and configuration information */
> + val = readl_relaxed(bdev->regs + BAM_REVISION) & NUM_EES_MASK;
> +
The ees shit is not zero and you got wrong ee. Could you add the line
below or something similar:
val = (val >> NUM_EES_SHIFT) & NUM_EES_MASK;
> + /* check that configured EE is within range */
> + if (bdev->ee >= val)
> + return -EINVAL;
> +
regards,
Stan
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