[PATCH] dmaengine: dw-edma: Add simple mode support

[Devendra K Verma <devverma@amd.com>]

Added the simple or non-linked list DMA mode of transfer.

Signed-off-by: Devendra K Verma <devverma@amd.com>
---
 drivers/dma/dw-edma/dw-edma-core.c    | 38 +++++++++++++++++
 drivers/dma/dw-edma/dw-edma-core.h    |  1 +
 drivers/dma/dw-edma/dw-hdma-v0-core.c | 59 ++++++++++++++++++++++++++-
 3 files changed, 97 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 68236247059d..bd975e6d419a 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -595,6 +595,43 @@ dw_edma_device_prep_interleaved_dma(struct dma_chan *dchan,
 	return dw_edma_device_transfer(&xfer);
 }
 
+static struct dma_async_tx_descriptor *
+dw_edma_device_prep_dma_memcpy(struct dma_chan *dchan,
+			       dma_addr_t dst,
+			       dma_addr_t src, size_t len,
+			       unsigned long flags)
+{
+	struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
+	struct dw_edma_chunk *chunk;
+	struct dw_edma_burst *burst;
+	struct dw_edma_desc *desc;
+
+	desc = dw_edma_alloc_desc(chan);
+	if (unlikely(!desc))
+		return NULL;
+
+	chunk = dw_edma_alloc_chunk(desc);
+	if (unlikely(!chunk))
+		goto err_alloc;
+
+	burst = dw_edma_alloc_burst(chunk);
+	if (unlikely(!burst))
+		goto err_alloc;
+
+	burst->sar = src;
+	burst->dar = dst;
+	burst->sz = len;
+	chunk->non_ll_en = true;
+
+	desc->alloc_sz += burst->sz;
+
+	return vchan_tx_prep(&chan->vc, &desc->vd, flags);
+
+err_alloc:
+	dw_edma_free_desc(desc);
+	return NULL;
+}
+
 static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
 {
 	struct dw_edma_desc *desc;
@@ -806,6 +843,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
 	dma->device_prep_slave_sg = dw_edma_device_prep_slave_sg;
 	dma->device_prep_dma_cyclic = dw_edma_device_prep_dma_cyclic;
 	dma->device_prep_interleaved_dma = dw_edma_device_prep_interleaved_dma;
+	dma->device_prep_dma_memcpy = dw_edma_device_prep_dma_memcpy;
 
 	dma_set_max_seg_size(dma->dev, U32_MAX);
 
diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h
index 71894b9e0b15..b496a1e5e326 100644
--- a/drivers/dma/dw-edma/dw-edma-core.h
+++ b/drivers/dma/dw-edma/dw-edma-core.h
@@ -58,6 +58,7 @@ struct dw_edma_chunk {
 
 	u8				cb;
 	struct dw_edma_region		ll_region;	/* Linked list */
+	bool				non_ll_en;
 };
 
 struct dw_edma_desc {
diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
index e3f8db4fe909..0d5fdab925fd 100644
--- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
@@ -225,7 +225,56 @@ static void dw_hdma_v0_sync_ll_data(struct dw_edma_chunk *chunk)
 		readl(chunk->ll_region.vaddr.io);
 }
 
-static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
+static void dw_hdma_v0_non_ll_start(struct dw_edma_chunk *chunk)
+{
+	struct dw_edma_chan *chan = chunk->chan;
+	struct dw_edma *dw = chan->dw;
+	struct dw_edma_burst *burst;
+	u64 addr;
+	u32 val;
+
+	burst = list_first_entry(&chunk->burst->list,
+				 struct dw_edma_burst, list);
+	if (!burst)
+		return;
+
+	/* Source Address */
+	addr = burst->sar;
+
+	SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
+
+	SET_CH_32(dw, chan->dir, chan->id, sar.lsb, lower_32_bits(addr));
+	SET_CH_32(dw, chan->dir, chan->id, sar.msb, upper_32_bits(addr));
+
+	/* Destination Address */
+	addr = burst->dar;
+
+	SET_CH_32(dw, chan->dir, chan->id, dar.lsb, lower_32_bits(addr));
+	SET_CH_32(dw, chan->dir, chan->id, dar.msb, upper_32_bits(addr));
+
+	/* Size */
+	SET_CH_32(dw, chan->dir, chan->id, transfer_size, burst->sz);
+
+	/* Interrupts */
+	val = GET_CH_32(dw, chan->dir, chan->id, int_setup) |
+	      HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
+	      HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
+
+	if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL))
+		val |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN;
+
+	SET_CH_32(dw, chan->dir, chan->id, int_setup, val);
+
+	/* Channel control */
+	val = GET_CH_32(dw, chan->dir, chan->id, control1);
+	val &= ~HDMA_V0_LINKLIST_EN;
+	SET_CH_32(dw, chan->dir, chan->id, control1, val);
+
+	/* Ring the doorbell */
+	SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START);
+}
+
+static void dw_hdma_v0_ll_start(struct dw_edma_chunk *chunk, bool first)
 {
 	struct dw_edma_chan *chan = chunk->chan;
 	struct dw_edma *dw = chan->dw;
@@ -263,6 +312,14 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
 	SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START);
 }
 
+static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
+{
+	if (!chunk->non_ll_en)
+		dw_hdma_v0_ll_start(chunk, first);
+	else
+		dw_hdma_v0_non_ll_start(chunk);
+}
+
 static void dw_hdma_v0_core_ch_config(struct dw_edma_chan *chan)
 {
 	struct dw_edma *dw = chan->dw;
-- 
2.43.0