Also, fix some minor formatting issues, and simplify the handling of "state" for writes.
Signed-off-by: Scott Wood scottwood@freescale.com --- I don't have hardware to test, so any help in that regard is appreciated.
Applied to u-boot-nand-flash.
board/socrates/nand.c | 84 ++++++++++++++++++------------------------------ 1 files changed, 32 insertions(+), 52 deletions(-)
diff --git a/board/socrates/nand.c b/board/socrates/nand.c index fc82ecb..6ec53f8 100644 --- a/board/socrates/nand.c +++ b/board/socrates/nand.c @@ -31,22 +31,20 @@ static int state; static void nand_write_byte(struct mtd_info *mtd, u_char byte); static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len); -static void nand_write_word(struct mtd_info *mtd, u16 word); static u_char nand_read_byte(struct mtd_info *mtd); static u16 nand_read_word(struct mtd_info *mtd); static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len); static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len); static int nand_device_ready(struct mtd_info *mtdinfo); -static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd);
#define FPGA_NAND_CMD_MASK (0x7 << 28) -#define FPGA_NAND_CMD_COMMAND (0x0 << 28) +#define FPGA_NAND_CMD_COMMAND (0x0 << 28) #define FPGA_NAND_CMD_ADDR (0x1 << 28) #define FPGA_NAND_CMD_READ (0x2 << 28) #define FPGA_NAND_CMD_WRITE (0x3 << 28) #define FPGA_NAND_BUSY (0x1 << 15) #define FPGA_NAND_ENABLE (0x1 << 31) -#define FPGA_NAND_DATA_SHIFT 16 +#define FPGA_NAND_DATA_SHIFT 16
/** * nand_write_byte - write one byte to the chip @@ -59,16 +57,6 @@ static void nand_write_byte(struct mtd_info *mtd, u_char byte) }
/** - * nand_write_word - write one word to the chip - * @mtd: MTD device structure - * @word: data word to write - */ -static void nand_write_word(struct mtd_info *mtd, u16 word) -{ - nand_write_buf(mtd, (const uchar *)&word, sizeof(word)); -} - -/** * nand_write_buf - write buffer to chip * @mtd: MTD device structure * @buf: data buffer @@ -78,18 +66,10 @@ static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; - long val; - - if ((state & FPGA_NAND_CMD_MASK) == FPGA_NAND_CMD_MASK) { - /* Write data */ - val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_WRITE; - } else { - /* Write address or command */ - val = state; - }
for (i = 0; i < len; i++) { - out_be32(this->IO_ADDR_W, val | (buf[i] << FPGA_NAND_DATA_SHIFT)); + out_be32(this->IO_ADDR_W, + state | (buf[i] << FPGA_NAND_DATA_SHIFT)); } }
@@ -148,7 +128,7 @@ static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
for (i = 0; i < len; i++) { if (buf[i] != nand_read_byte(mtd)); - return -EFAULT; + return -EFAULT; } return 0; } @@ -171,42 +151,42 @@ static int nand_device_ready(struct mtd_info *mtdinfo) * @mtd: MTD device structure * @cmd: Command */ -static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd) +static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl) { + if (ctrl & NAND_CTRL_CHANGE) { + state &= ~(FPGA_NAND_CMD_MASK | FPGA_NAND_ENABLE); + + switch (ctrl & (NAND_ALE | NAND_CLE)) { + case 0: + state |= FPGA_NAND_CMD_WRITE; + break; + + case NAND_ALE: + state |= FPGA_NAND_CMD_ADDR; + break;
- switch(cmd) { - case NAND_CTL_CLRALE: - state |= FPGA_NAND_CMD_MASK; /* use all 1s to mark */ - break; - case NAND_CTL_CLRCLE: - state |= FPGA_NAND_CMD_MASK; /* use all 1s to mark */ - break; - case NAND_CTL_SETCLE: - state = (state & ~FPGA_NAND_CMD_MASK) | FPGA_NAND_CMD_COMMAND; - break; - case NAND_CTL_SETALE: - state = (state & ~FPGA_NAND_CMD_MASK) | FPGA_NAND_CMD_ADDR; - break; - case NAND_CTL_SETNCE: - state |= FPGA_NAND_ENABLE; - break; - case NAND_CTL_CLRNCE: - state &= ~FPGA_NAND_ENABLE; - break; - default: - printf("%s: unknown cmd %#x\n", __FUNCTION__, cmd); - break; + case NAND_CLE: + state |= FPGA_NAND_CMD_COMMAND; + break; + + default: + printf("%s: unknown ctrl %#x\n", __FUNCTION__, ctrl); + } + + if (ctrl & NAND_NCE) + state |= FPGA_NAND_ENABLE; } + + if (cmd != NAND_CMD_NONE) + nand_write_byte(mtdinfo, cmd); }
int board_nand_init(struct nand_chip *nand) { - nand->hwcontrol = nand_hwcontrol; - nand->eccmode = NAND_ECC_SOFT; + nand->cmd_ctrl = nand_hwcontrol; + nand->ecc.mode = NAND_ECC_SOFT; nand->dev_ready = nand_device_ready; - nand->write_byte = nand_write_byte; nand->read_byte = nand_read_byte; - nand->write_word = nand_write_word; nand->read_word = nand_read_word; nand->write_buf = nand_write_buf; nand->read_buf = nand_read_buf;