diff options
| author | Green Wan <green.wan@sifive.com> | 2019-11-07 11:49:21 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-11-14 10:10:46 +0300 |
| commit | 6973886ad58e6b4988813331abb76ae0b364a9c2 (patch) | |
| tree | fbd80c2cb1a27c58b89176fde037c50d7e2937b8 /drivers/dma/sf-pdma/Kconfig | |
| parent | fa805360f4cfa34cb3575715e1c8b4f9a253b474 (diff) | |
| download | linux-6973886ad58e6b4988813331abb76ae0b364a9c2.tar.xz | |
dmaengine: sf-pdma: add platform DMA support for HiFive Unleashed A00
Add PDMA driver, sf-pdma, to enable DMA engine on HiFive Unleashed
Rev A00 board.
- Implement dmaengine APIs, support MEM_TO_MEM async copy.
- Tested by DMA Test client
- Supports 4 channels DMA, each channel has 1 done and 1 err
interrupt connected to platform-level interrupt controller (PLIC).
- Depends on DMA_ENGINE and DMA_VIRTUAL_CHANNELS
The datasheet is here:
https://static.dev.sifive.com/FU540-C000-v1.0.pdf
Follow the DMAengine controller doc,
"./Documentation/driver-api/dmaengine/provider.rst" to implement DMA
engine. And use the dma test client in doc,
"./Documentation/driver-api/dmaengine/dmatest.rst", to test.
Each DMA channel has separate HW regs and support done and error ISRs.
4 channels share 1 done and 1 err ISRs. There's no expander/arbitrator
in DMA HW.
------ ------
| |--< done 23 >--|ch 0|
| |--< err 24 >--| | (dma0chan0)
| | ------
| | ------
| |--< done 25 >--|ch 1|
| |--< err 26 >--| | (dma0chan1)
|PLIC| ------
| | ------
| |--< done 27 >--|ch 2|
| |--< err 28 >--| | (dma0chan2)
| | ------
| | ------
| |--< done 29 >--|ch 3|
| |--< err 30 >--| | (dma0chan3)
------ ------
Signed-off-by: Green Wan <green.wan@sifive.com>
Link: https://lore.kernel.org/r/20191107084955.7580-4-green.wan@sifive.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/sf-pdma/Kconfig')
| -rw-r--r-- | drivers/dma/sf-pdma/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/sf-pdma/Kconfig b/drivers/dma/sf-pdma/Kconfig new file mode 100644 index 000000000000..f8ffa02e279f --- /dev/null +++ b/drivers/dma/sf-pdma/Kconfig @@ -0,0 +1,6 @@ +config SF_PDMA + tristate "Sifive PDMA controller driver" + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support the SiFive PDMA controller. |