diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/fsl_upm.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c index e7e746b..7cb99cb 100644 --- a/drivers/mtd/nand/fsl_upm.c +++ b/drivers/mtd/nand/fsl_upm.c @@ -48,6 +48,20 @@ static void fsl_upm_run_pattern(struct fsl_upm *upm, int width, } } +static void fun_wait(struct fsl_upm_nand *fun) +{ + if (fun->dev_ready) { + while (!fun->dev_ready(fun->chip_nr)) + debug("unexpected busy state\n"); + } else { + /* + * If the R/B pin is not connected, like on the TQM8548, + * a short delay is necessary. + */ + udelay(1); + } +} + #if CONFIG_SYS_NAND_MAX_CHIPS > 1 static void fun_select_chip(struct mtd_info *mtd, int chip_nr) { @@ -99,15 +113,13 @@ static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) fsl_upm_run_pattern(&fun->upm, fun->width, io_addr, mar); /* - * Some boards/chips needs this. At least on MPC8360E-RDK we - * need it. Probably weird chip, because I don't see any need - * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are - * 0-2 unexpected busy states per block read. + * Some boards/chips needs this. At least the MPC8360E-RDK and + * TQM8548 need it. Probably weird chip, because I don't see + * any need for this on MPC8555E + Samsung K9F1G08U0A. Usually + * here are 0-2 unexpected busy states per block read. */ - if (fun->wait_pattern) { - while (!fun->dev_ready(fun->chip_nr)) - debug("unexpected busy state\n"); - } + if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN) + fun_wait(fun); } static u8 nand_read_byte(struct mtd_info *mtd) @@ -121,9 +133,16 @@ static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *chip = mtd->priv; + struct fsl_upm_nand *fun = chip->priv; - for (i = 0; i < len; i++) + for (i = 0; i < len; i++) { out_8(chip->IO_ADDR_W, buf[i]); + if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE) + fun_wait(fun); + } + + if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER) + fun_wait(fun); } static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) |