diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-01-07 14:07:40 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-01-07 15:27:13 +0300 |
| commit | 934891b0a16c55716de9cdd6cefc82cc2b75eb4a (patch) | |
| tree | 48eb144f6899be60d12c4655fbd023f5e37546dc /drivers/dma/dw/regs.h | |
| parent | 91f0ff883e9ae654503fc62c588eefc8558e457f (diff) | |
| download | linux-934891b0a16c55716de9cdd6cefc82cc2b75eb4a.tar.xz | |
dmaengine: dw: Don't pollute CTL_LO on iDMA 32-bit
Intel iDMA 32-bit doesn't have a concept of bus masters and thus
there is no need to setup any kind of masters in the CTL_LO register.
Moreover, the burst size for memory-to-memory transfer is not what is says,
we need to have a corrected list of possible sizes. Note, that
the size of 8 items, each of that up to 4 bytes, is chosen because of
maximum of 1/2 FIFO, which is 64 bytes on Intel Merrifield.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/dw/regs.h')
| -rw-r--r-- | drivers/dma/dw/regs.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h index 6cf299facf45..07f91325e559 100644 --- a/drivers/dma/dw/regs.h +++ b/drivers/dma/dw/regs.h @@ -222,6 +222,16 @@ enum dw_dma_msize { /* iDMA 32-bit support */ +/* bursts size */ +enum idma32_msize { + IDMA32_MSIZE_1, + IDMA32_MSIZE_2, + IDMA32_MSIZE_4, + IDMA32_MSIZE_8, + IDMA32_MSIZE_16, + IDMA32_MSIZE_32, +}; + /* Bitfields in CTL_HI */ #define IDMA32C_CTLH_BLOCK_TS_MASK GENMASK(16, 0) #define IDMA32C_CTLH_BLOCK_TS(x) ((x) & IDMA32C_CTLH_BLOCK_TS_MASK) @@ -316,6 +326,7 @@ struct dw_dma { void (*initialize_chan)(struct dw_dma_chan *dwc); void (*suspend_chan)(struct dw_dma_chan *dwc, bool drain); void (*resume_chan)(struct dw_dma_chan *dwc, bool drain); + u32 (*prepare_ctllo)(struct dw_dma_chan *dwc); void (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst); u32 (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes, unsigned int width, size_t *len); |