ARCv3: Add CDMA support driver #138
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Let's not use these magic numbers and have proper defines instead (bits mask / bits shift)
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| /* Write will block iff busy i.e. DMA_C_STATUS_AUX.B bit is set */ | |
| /* Write will block if busy i.e. DMA_C_STATUS_AUX.B bit is set */ |
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probably we can remove 'WARN' from comment - this info is provided by dev_warn. Same for dev_err
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Magic number. Probably we can name it as DW_CDMA_MIN_VERSION or something like that.
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This is suspicious as we set DMA_BIT_MASK(64)
drivers/dma/dw-cdma/dw-cdma.h
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Extra tab. I'd expect that it should be detected by checkpatch.
drivers/dma/dw-cdma/dw-cdma.h
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| x = x & o; | |
| x &= o; |
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Driver to support Cluster DMA(CDMA) controller for ARCv3. For HS58 tested on nSIM and HAPS using 'dmatest' driver. For HS68 tested on nSIM using 'dmatest' driver. Known limitations: Don't specify 'test_buf_size' 'dmatest' parameter more then 750000 when L2$ is enabled. Looks like L2$ operations in cache-arcv3.c:scm_op_rgn() fails when sz > 750000. Probably it is restriction in HW. Otherwise the kernel will crash.
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Driver to support Cluster DMA(CDMA) controller for ARCv3. For HS58 tested on nSIM and HAPS using 'dmatest' driver. For HS68 tested on nSIM using 'dmatest' driver.
Known limitations:
Don't specify 'test_buf_size' 'dmatest' parameter more then 750000 when L2$ is enabled. Looks like L2$ operations in cache-arcv3.c:scm_op_rgn() fails when sz > 750000. Probably it is restriction in HW. Otherwise the kernel will crash.