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| author | Wolfgang Grandegger <wg@grandegger.com> | 2009-03-30 12:02:43 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-04-06 07:17:59 -0700 |
| commit | ade92a636f15d7e5b92e2df22e8fcb6c7640cd4f (patch) | |
| tree | a1b481b9145a5e95f190ded835ef11c5e7ae2556 | |
| parent | b6e0e8c07754c8aefd6ff3536463fed5f71405a0 (diff) | |
| download | linux-ade92a636f15d7e5b92e2df22e8fcb6c7640cd4f.tar.gz linux-ade92a636f15d7e5b92e2df22e8fcb6c7640cd4f.tar.bz2 linux-ade92a636f15d7e5b92e2df22e8fcb6c7640cd4f.zip | |
[MTD] [NAND] FSL-UPM: Add wait flags to support board/chip specific delays
The NAND flash on the TQM8548_BE modules requires a short delay after
running the UPM pattern. The TQM8548_BE requires a further short delay
after writing out a buffer. Normally the R/B pin should be checked, but
it's not connected on the TQM8548_BE. The existing driver uses similar
fixed delay points. To manage these extra delays in a more general way,
I introduced the "fsl,ump-wait-flags" property allowing the board-
specific driver to specify various types of extra delay.
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/nand/fsl_upm.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c index 430de6de9ac6..d120cd8d7267 100644 --- a/drivers/mtd/nand/fsl_upm.c +++ b/drivers/mtd/nand/fsl_upm.c @@ -23,6 +23,10 @@ #include <linux/io.h> #include <asm/fsl_lbc.h> +#define FSL_UPM_WAIT_RUN_PATTERN 0x1 +#define FSL_UPM_WAIT_WRITE_BYTE 0x2 +#define FSL_UPM_WAIT_WRITE_BUFFER 0x4 + struct fsl_upm_nand { struct device *dev; struct mtd_info mtd; @@ -41,6 +45,7 @@ struct fsl_upm_nand { uint32_t mchip_count; uint32_t mchip_number; int chip_delay; + uint32_t wait_flags; }; #define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd) @@ -96,7 +101,8 @@ static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) fun->mchip_offsets[fun->mchip_number]; fsl_upm_run_pattern(&fun->upm, chip->IO_ADDR_R, mar); - fun_wait_rnb(fun); + if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN) + fun_wait_rnb(fun); } static void fun_select_chip(struct mtd_info *mtd, int mchip_nr) @@ -138,8 +144,11 @@ static void fun_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len) for (i = 0; i < len; i++) { out_8(fun->chip.IO_ADDR_W, buf[i]); - fun_wait_rnb(fun); + if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE) + fun_wait_rnb(fun); } + if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER) + fun_wait_rnb(fun); } static int __devinit fun_chip_init(struct fsl_upm_nand *fun, @@ -285,6 +294,13 @@ static int __devinit fun_probe(struct of_device *ofdev, else fun->chip_delay = 50; + prop = of_get_property(ofdev->node, "fsl,upm-wait-flags", &size); + if (prop && size == sizeof(uint32_t)) + fun->wait_flags = *prop; + else + fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN | + FSL_UPM_WAIT_WRITE_BYTE; + fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start, io_res.end - io_res.start + 1); if (!fun->io_base) { |