dmaengine: DW DMAC: add multi-block property to device tree

Several versions of DW DMAC have multi block transfers hardware
support. Hardware support of multi block transfers is disabled
by default if we use DT to configure DMAC and software emulation
of multi block transfers used instead.
Add multi-block property, so it is possible to enable hardware
multi block transfers (if present) via DT.

Switch from per device is_nollp variable to multi_block array
to be able enable/disable multi block transfers separately per
channel.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/platform_data/dma-dw.h b/include/linux/platform_data/dma-dw.h
index 5f0e11e7354c..e69e415d0d98 100644
--- a/include/linux/platform_data/dma-dw.h
+++ b/include/linux/platform_data/dma-dw.h
@@ -14,6 +14,7 @@
 #include <linux/device.h>
 
 #define DW_DMA_MAX_NR_MASTERS   4
+#define DW_DMA_MAX_NR_CHANNELS  8
 
 /**
  * struct dw_dma_slave - Controller-specific information about a slave
@@ -40,19 +41,18 @@ struct dw_dma_slave {
  * @is_private: The device channels should be marked as private and not for
  *      by the general purpose DMA channel allocator.
  * @is_memcpy: The device channels do support memory-to-memory transfers.
- * @is_nollp: The device channels does not support multi block transfers.
  * @chan_allocation_order: Allocate channels starting from 0 or 7
  * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
  * @block_size: Maximum block size supported by the controller
  * @nr_masters: Number of AHB masters supported by the controller
  * @data_width: Maximum data width supported by hardware per AHB master
  *              (in bytes, power of 2)
+ * @multi_block: Multi block transfers supported by hardware per channel.
  */
 struct dw_dma_platform_data {
         unsigned int    nr_channels;
         bool            is_private;
         bool            is_memcpy;
-        bool            is_nollp;
 #define CHAN_ALLOCATION_ASCENDING       0       /* zero to seven */
 #define CHAN_ALLOCATION_DESCENDING      1       /* seven to zero */
         unsigned char   chan_allocation_order;
@@ -62,6 +62,7 @@ struct dw_dma_platform_data {
         unsigned int    block_size;
         unsigned char   nr_masters;
         unsigned char   data_width[DW_DMA_MAX_NR_MASTERS];
+        unsigned char   multi_block[DW_DMA_MAX_NR_CHANNELS];
 };
 
 #endif /* _PLATFORM_DATA_DMA_DW_H */