ar71xx: ar934x_nfc: allow to control DMA data swap via platform data

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 34588

1 files changed, 35 insertions, 10 deletions

diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c b/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c
index 7fd04ca..7939f92 100644
--- a/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c
+++ b/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c
@@ -174,6 +174,7 @@ struct ar934x_nfc {
 	struct device *parent;
 	void __iomem *base;
 	void (*select_chip)(int chip_no);
+	bool swap_dma;
 	int irq;
 	wait_queue_head_t irq_waitq;
 
@@ -190,6 +191,8 @@ struct ar934x_nfc {
 	unsigned int buf_size;
 	int buf_index;
 
+	bool read_id;
+
 	int erase1_page_addr;
 
 	int rndout_page_addr;
@@ -591,7 +594,10 @@ ar934x_nfc_read_status(struct ar934x_nfc *nfc)
 	nfc_dbg(nfc, "read status, cmd:%08x status:%02x\n",
 		cmd_reg, (status & 0xff));
 
-	nfc->buf[0 ^ 3] = status;
+	if (nfc->swap_dma)
+		nfc->buf[0 ^ 3] = status;
+	else
+		nfc->buf[0] = status;
 }
 
 static void
@@ -600,6 +606,7 @@ ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command, int column,
 {
 	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
 
+	nfc->read_id = false;
 	if (command != NAND_CMD_PAGEPROG)
 		nfc->buf_index = 0;
 
@@ -609,6 +616,7 @@ ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command, int column,
 		break;
 
 	case NAND_CMD_READID:
+		nfc->read_id = true;
 		ar934x_nfc_send_readid(nfc, command);
 		break;
 
@@ -717,13 +725,15 @@ static u8
 ar934x_nfc_read_byte(struct mtd_info *mtd)
 {
 	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-	unsigned int buf_index;
 	u8 data;
 
 	WARN_ON(nfc->buf_index >= nfc->buf_size);
 
-	buf_index = nfc->buf_index ^ 3;
-	data = nfc->buf[buf_index];
+	if (nfc->swap_dma || nfc->read_id)
+		data = nfc->buf[nfc->buf_index ^ 3];
+	else
+		data = nfc->buf[nfc->buf_index];
+
 	nfc->buf_index++;
 
 	return data;
@@ -737,9 +747,16 @@ ar934x_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 
 	WARN_ON(nfc->buf_index + len > nfc->buf_size);
 
-	for (i = 0; i < len; i++) {
-		nfc->buf[nfc->buf_index ^ 3] = buf[i];
-		nfc->buf_index++;
+	if (nfc->swap_dma) {
+		for (i = 0; i < len; i++) {
+			nfc->buf[nfc->buf_index ^ 3] = buf[i];
+			nfc->buf_index++;
+		}
+	} else {
+		for (i = 0; i < len; i++) {
+			nfc->buf[nfc->buf_index] = buf[i];
+			nfc->buf_index++;
+		}
 	}
 }
 
@@ -754,9 +771,16 @@ ar934x_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 
 	buf_index = nfc->buf_index;
 
-	for (i = 0; i < len; i++) {
-		buf[i] = nfc->buf[buf_index ^ 3];
-		buf_index++;
+	if (nfc->swap_dma || nfc->read_id) {
+		for (i = 0; i < len; i++) {
+			buf[i] = nfc->buf[buf_index ^ 3];
+			buf_index++;
+		}
+	} else {
+		for (i = 0; i < len; i++) {
+			buf[i] = nfc->buf[buf_index];
+			buf_index++;
+		}
 	}
 
 	nfc->buf_index = buf_index;
@@ -1028,6 +1052,7 @@ ar934x_nfc_probe(struct platform_device *pdev)
 
 	nfc->parent = &pdev->dev;
 	nfc->select_chip = pdata->select_chip;
+	nfc->swap_dma = pdata->swap_dma;
 
 	nand = &nfc->nand_chip;
 	mtd = &nfc->mtd;