mtd: vf610_nfc: enable ONFI detection

This changes enable ONFI detection. The Read ID command now allows
one address byte which is needed for ONFI detection. To read the
ONFI parameter page, the NAND_CMD_PARAM need to be supported. The
CMD code enables one command and one address byte along with reading
data from flash using R/B#, as specified by ONFI.

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 2c02ff5996d61a8766862447b399bcdd1d6d0bce..99457d4ad112b049a8802988c2099dd00f9f2fc3 100644 (file)
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -62,6 +62,7 @@
  * Briefly these are bitmasks of controller cycles.
  */
 #define READ_PAGE_CMD_CODE             0x7EE0
+#define READ_ONFI_PARAM_CMD_CODE       0x4860
 #define PROGRAM_PAGE_CMD_CODE          0x7FC0
 #define ERASE_CMD_CODE                 0x4EC0
 #define READ_ID_CMD_CODE               0x4804
@@ -150,6 +151,7 @@ struct vf610_nfc {
        int                alt_buf;
 #define ALT_BUF_ID   1
 #define ALT_BUF_STAT 2
+#define ALT_BUF_ONFI 3
        struct clk        *clk;
 };
 
@@ -390,6 +392,15 @@ static void vf610_nfc_command(struct mtd_info *mtd, unsigned command,
                vf610_nfc_ecc_mode(mtd, ECC_HW_MODE);
                break;
 
+       case NAND_CMD_PARAM:
+               nfc->alt_buf = ALT_BUF_ONFI;
+               vf610_nfc_transfer_size(nfc->regs, 768);
+               vf610_nfc_send_command(nfc->regs, NAND_CMD_PARAM, READ_ONFI_PARAM_CMD_CODE);
+               vf610_nfc_set_field(mtd, NFC_ROW_ADDR, ROW_ADDR_MASK,
+                                   ROW_ADDR_SHIFT, column);
+               vf610_nfc_ecc_mode(mtd, ECC_BYPASS);
+               break;
+
        case NAND_CMD_ERASE1:
                vf610_nfc_transfer_size(nfc->regs, 0);
                vf610_nfc_send_commands(nfc->regs, command,
@@ -399,8 +410,11 @@ static void vf610_nfc_command(struct mtd_info *mtd, unsigned command,
 
        case NAND_CMD_READID:
                nfc->alt_buf = ALT_BUF_ID;
+               nfc->column = 0;
                vf610_nfc_transfer_size(nfc->regs, 0);
                vf610_nfc_send_command(nfc->regs, command, READ_ID_CMD_CODE);
+               vf610_nfc_set_field(mtd, NFC_ROW_ADDR, ROW_ADDR_MASK,
+                                   ROW_ADDR_SHIFT, column);
                break;
 
        case NAND_CMD_STATUS:
@@ -422,17 +436,11 @@ static void vf610_nfc_read_buf(struct mtd_info *mtd, u_char *buf, int len)
        struct vf610_nfc *nfc = mtd_to_nfc(mtd);
        uint c = nfc->column;
 
-       switch (nfc->alt_buf) {
-       case ALT_BUF_ID:
-               *buf = vf610_nfc_get_id(mtd, c);
-               break;
-       case ALT_BUF_STAT:
-               *buf = vf610_nfc_get_status(mtd);
-               break;
-       default:
-               vf610_nfc_memcpy(buf, nfc->regs + NFC_MAIN_AREA(0) + c, len);
-               break;
-       }
+       /* Alternate buffers are only supported through read_byte */
+       if (nfc->alt_buf)
+               return;
+
+       vf610_nfc_memcpy(buf, nfc->regs + NFC_MAIN_AREA(0) + c, len);
 
        nfc->column += len;
 }
@@ -453,8 +461,28 @@ static void vf610_nfc_write_buf(struct mtd_info *mtd, const u_char *buf,
 /* Read byte from NFC buffers */
 static u8 vf610_nfc_read_byte(struct mtd_info *mtd)
 {
+       struct vf610_nfc *nfc = mtd_to_nfc(mtd);
        u8 tmp;
-       vf610_nfc_read_buf(mtd, &tmp, sizeof(tmp));
+       uint c = nfc->column;
+
+       switch (nfc->alt_buf) {
+       case ALT_BUF_ID:
+               tmp = vf610_nfc_get_id(mtd, c);
+               break;
+       case ALT_BUF_STAT:
+               tmp = vf610_nfc_get_status(mtd);
+               break;
+       case ALT_BUF_ONFI:
+               /* Reverse byte since the controller uses big endianness */
+               c = nfc->column % 4;
+               c = nfc->column - c + (3 - c);
+               tmp = *((u8 *)(nfc->regs + NFC_MAIN_AREA(0) + c));
+               break;
+       default:
+               tmp = *((u8 *)(nfc->regs + NFC_MAIN_AREA(0) + c));
+               break;
+       }
+       nfc->column++;
        return tmp;
 }
 
@@ -602,13 +630,11 @@ static int vf610_nfc_nand_init(int devnum, void __iomem *addr)
        mtd->priv = chip;
        chip->priv = nfc;
 
-       if (cfg.width == 16) {
+       if (cfg.width == 16)
                chip->options |= NAND_BUSWIDTH_16;
-               vf610_nfc_set(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
-       } else {
-               chip->options &= ~NAND_BUSWIDTH_16;
-               vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
-       }
+
+       /* Use 8-bit mode during initialization */
+       vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
 
        /* Disable subpage writes as we do not provide ecc->hwctl */
        chip->options |= NAND_NO_SUBPAGE_WRITE;
@@ -651,6 +677,9 @@ static int vf610_nfc_nand_init(int devnum, void __iomem *addr)
                goto error;
        }
 
+       if (cfg.width == 16)
+               vf610_nfc_set(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
+
        chip->ecc.mode = NAND_ECC_SOFT; /* default */
 
        /* Single buffer only, max 256 OOB minus ECC status */

diff --git a/include/configs/vf610twr.h b/include/configs/vf610twr.h
index 621aa134844d715bef2a0e3752b2c46806652a37..aa310411bf2ddb091cf9134f23c5cd1a80079373 100644 (file)
--- a/include/configs/vf610twr.h
+++ b/include/configs/vf610twr.h
@@ -48,6 +48,7 @@
 /* NAND support */
 #define CONFIG_CMD_NAND
 #define CONFIG_CMD_NAND_TRIMFFS
+#define CONFIG_SYS_NAND_ONFI_DETECTION
 
 #ifdef CONFIG_CMD_NAND
 #define CONFIG_USE_ARCH_MEMCPY