dw_dmac: Allow src/dst msize & flow controller to be configured at runtime
Msize or Burst Size is peripheral dependent in case of prep_slave_sg and
cyclic_prep transfers, and in case of memcpy transfers it is platform dependent.
So msize configuration must come from platform data.
Also some peripherals (ex: JPEG), need to be flow controller for dma transfers,
so this information in case of slave_sg & cyclic_prep transfers must come from
platform data.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h
index 3ba2f06..6998d93 100644
--- a/include/linux/dw_dmac.h
+++ b/include/linux/dw_dmac.h
@@ -42,6 +42,30 @@
DW_DMA_SLAVE_WIDTH_32BIT,
};
+/* bursts size */
+enum dw_dma_msize {
+ DW_DMA_MSIZE_1,
+ DW_DMA_MSIZE_4,
+ DW_DMA_MSIZE_8,
+ DW_DMA_MSIZE_16,
+ DW_DMA_MSIZE_32,
+ DW_DMA_MSIZE_64,
+ DW_DMA_MSIZE_128,
+ DW_DMA_MSIZE_256,
+};
+
+/* flow controller */
+enum dw_dma_fc {
+ DW_DMA_FC_D_M2M,
+ DW_DMA_FC_D_M2P,
+ DW_DMA_FC_D_P2M,
+ DW_DMA_FC_D_P2P,
+ DW_DMA_FC_P_P2M,
+ DW_DMA_FC_SP_P2P,
+ DW_DMA_FC_P_M2P,
+ DW_DMA_FC_DP_P2P,
+};
+
/**
* struct dw_dma_slave - Controller-specific information about a slave
*
@@ -55,6 +79,9 @@
* @cfg_lo: Platform-specific initializer for the CFG_LO register
* @src_master: src master for transfers on allocated channel.
* @dst_master: dest master for transfers on allocated channel.
+ * @src_msize: src burst size.
+ * @dst_msize: dest burst size.
+ * @fc: flow controller for DMA transfer
*/
struct dw_dma_slave {
struct device *dma_dev;
@@ -65,6 +92,9 @@
u32 cfg_lo;
u8 src_master;
u8 dst_master;
+ u8 src_msize;
+ u8 dst_msize;
+ u8 fc;
};
/* Platform-configurable bits in CFG_HI */