[PATCH 1/1] mtd: rawnand: cadence: support 64-bit slave dma interface

[Valentin Korenblit]

32-bit accesses on 64-bit sdma trigger sdma_err in intr_status register.

Check dma capabilities before reading/writing from/to sdma interface.

Signed-off-by: Valentin Korenblit <vkorenblit at sequans.com>
---
 .../mtd/nand/raw/cadence-nand-controller.c    | 56 +++++++++++++++----
 1 file changed, 44 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c
index 0b52c1280cf8..9e3216cc1d8e 100644
--- a/drivers/mtd/nand/raw/cadence-nand-controller.c
+++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
@@ -1882,17 +1882,33 @@ static int cadence_nand_read_buf(struct cdns_nand_ctrl *cdns_ctrl,
 		return status;
 
 	if (!cdns_ctrl->caps1->has_dma) {
-		int len_in_words = len >> 2;
+		u8 data_dma_width = cdns_ctrl->caps2.data_dma_width;
+
+		int len_in_words = (data_dma_width == 4) ? len >> 2 : len >> 3;
 
 		/* read alingment data */
-		ioread32_rep(cdns_ctrl->io.virt, buf, len_in_words);
+		if (data_dma_width == 4)
+			ioread32_rep(cdns_ctrl->io.virt, buf, len_in_words);
+		else
+			ioread64_rep(cdns_ctrl->io.virt, buf, len_in_words);
+
 		if (sdma_size > len) {
+			int read_bytes = (data_dma_width == 4) ?
+				len_in_words << 2 : len_in_words << 3;
+
 			/* read rest data from slave DMA interface if any */
-			ioread32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
-				     sdma_size / 4 - len_in_words);
+			if (data_dma_width == 4)
+				ioread32_rep(cdns_ctrl->io.virt,
+					     cdns_ctrl->buf,
+					     sdma_size / 4 - len_in_words);
+			else
+				ioread64_rep(cdns_ctrl->io.virt,
+					     cdns_ctrl->buf,
+					     sdma_size / 8 - len_in_words);
+
 			/* copy rest of data */
-			memcpy(buf + (len_in_words << 2), cdns_ctrl->buf,
-			       len - (len_in_words << 2));
+			memcpy(buf + read_bytes, cdns_ctrl->buf,
+			       len - read_bytes);
 		}
 		return 0;
 	}
@@ -1936,16 +1952,32 @@ static int cadence_nand_write_buf(struct cdns_nand_ctrl *cdns_ctrl,
 		return status;
 
 	if (!cdns_ctrl->caps1->has_dma) {
-		int len_in_words = len >> 2;
+		u8 data_dma_width = cdns_ctrl->caps2.data_dma_width;
+
+		int len_in_words = (data_dma_width == 4) ? len >> 2 : len >> 3;
+
+		if (data_dma_width == 4)
+			iowrite32_rep(cdns_ctrl->io.virt, buf, len_in_words);
+		else
+			iowrite64_rep(cdns_ctrl->io.virt, buf, len_in_words);
 
-		iowrite32_rep(cdns_ctrl->io.virt, buf, len_in_words);
 		if (sdma_size > len) {
+			int written_bytes = (data_dma_width == 4) ?
+				len_in_words << 2 : len_in_words << 3;
+
 			/* copy rest of data */
-			memcpy(cdns_ctrl->buf, buf + (len_in_words << 2),
-			       len - (len_in_words << 2));
+			memcpy(cdns_ctrl->buf, buf + written_bytes,
+			       len - written_bytes);
+
 			/* write all expected by nand controller data */
-			iowrite32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
-				      sdma_size / 4 - len_in_words);
+			if (data_dma_width == 4)
+				iowrite32_rep(cdns_ctrl->io.virt,
+					      cdns_ctrl->buf,
+					      sdma_size / 4 - len_in_words);
+			else
+				iowrite64_rep(cdns_ctrl->io.virt,
+					      cdns_ctrl->buf,
+					      sdma_size / 8 - len_in_words);
 		}
 
 		return 0;
-- 
2.20.1

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