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

[openwrt/staging/mkresin.git] / target / linux / ar71xx / files / drivers / mtd / nand / ar934x_nfc.c

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 7fd04ca62130cf163b4a40bad410692fbad0c695..7939f9218ca58103e6db70d477e1b79be2e26428 100644 (file)
--- 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;