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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2012-09-21 14:05:49 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@linux.intel.com> | 2012-09-27 12:05:23 +0200 |
| commit | fed2574b3c9f44556ed4f5cb17f63b15edd87d06 (patch) | |
| tree | 1b080d85ea7e32778dae4d0dfce9d961bd5efee0 /drivers/dma/dw_dmac_regs.h | |
| parent | dw_dmac: autoconfigure data_width or get it via platform data (diff) | |
| download | linux-fed2574b3c9f44556ed4f5cb17f63b15edd87d06.tar.xz linux-fed2574b3c9f44556ed4f5cb17f63b15edd87d06.zip | |
dw_dmac: introduce software emulation of LLP transfers
Some controllers have the reduced functionality where the LLP multi block
transfers are not supported. This patch introduces a support of such
controllers. In case of memory copy or scatter-gather lists it emulates LLP
transfers via bunch of the regular single block ones.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'drivers/dma/dw_dmac_regs.h')
| -rw-r--r-- | drivers/dma/dw_dmac_regs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h index 06f03914f022..ff39fa6cd2bc 100644 --- a/drivers/dma/dw_dmac_regs.h +++ b/drivers/dma/dw_dmac_regs.h @@ -172,6 +172,7 @@ struct dw_dma_regs { enum dw_dmac_flags { DW_DMA_IS_CYCLIC = 0, + DW_DMA_IS_SOFT_LLP = 1, }; struct dw_dma_chan { @@ -182,6 +183,10 @@ struct dw_dma_chan { bool paused; bool initialized; + /* software emulation of the LLP transfers */ + struct list_head *tx_list; + struct list_head *tx_node_active; + spinlock_t lock; /* these other elements are all protected by lock */ @@ -195,6 +200,7 @@ struct dw_dma_chan { /* hardware configuration */ unsigned int block_size; + bool nollp; /* configuration passed via DMA_SLAVE_CONFIG */ struct dma_slave_config dma_sconfig; |