dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers

Untill now, sg_len greater than one is not supported. This patch adds support to
do that.

Note: Still, if peripheral is flow controller, sg_len can't be greater that one.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 16 insertions, 6 deletions

diff --git a/include/linux/amba/pl08x.h b/include/linux/amba/pl08x.h
index a22662c93981..9eabffbc4e50 100644
--- a/include/linux/amba/pl08x.h
+++ b/include/linux/amba/pl08x.h
@@ -106,12 +106,24 @@ struct pl08x_phy_chan {
 };
 
 /**
+ * struct pl08x_sg - structure containing data per sg
+ * @src_addr: src address of sg
+ * @dst_addr: dst address of sg
+ * @len: transfer len in bytes
+ * @node: node for txd's dsg_list
+ */
+struct pl08x_sg {
+        dma_addr_t src_addr;
+        dma_addr_t dst_addr;
+        size_t len;
+        struct list_head node;
+};
+
+/**
  * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
  * @tx: async tx descriptor
  * @node: node for txd list for channels
- * @src_addr: src address of txd
- * @dst_addr: dst address of txd
- * @len: transfer len in bytes
+ * @dsg_list: list of children sg's
  * @direction: direction of transfer
  * @llis_bus: DMA memory address (physical) start for the LLIs
  * @llis_va: virtual memory address start for the LLIs
@@ -121,10 +133,8 @@ struct pl08x_phy_chan {
 struct pl08x_txd {
         struct dma_async_tx_descriptor tx;
         struct list_head node;
+        struct list_head dsg_list;
         enum dma_data_direction direction;
-        dma_addr_t src_addr;
-        dma_addr_t dst_addr;
-        size_t len;
         dma_addr_t llis_bus;
         struct pl08x_lli *llis_va;
         /* Default cctl value for LLIs */