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| author | Aaron Williams <aaron.williams@caviumnetworks.com> | 2011-04-12 00:59:04 -0700 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2011-04-21 15:51:49 +0200 |
| commit | a90b9575f3ff71de58672295504e9ebaa8f051b4 (patch) | |
| tree | 794208cfdf967e0e907baa185b5302472136d414 /drivers/mtd | |
| parent | 5b448adb4b2f3244419de6409949a730771f8b21 (diff) | |
| download | u-boot-imx-a90b9575f3ff71de58672295504e9ebaa8f051b4.zip u-boot-imx-a90b9575f3ff71de58672295504e9ebaa8f051b4.tar.gz u-boot-imx-a90b9575f3ff71de58672295504e9ebaa8f051b4.tar.bz2 | |
cfi_flash driver - Add delay after reset command
I ran into a problem where the reset was failing except when I enabled
debugging support. After talking with Garret Swalling at Spansion I
was told that the GL-N series of devices require a 500ns wait for the
reset to complete. The below patch adds a 1us delay after all reset
commands.
-Aaron Williams
Signed-off-by: Aaron Williams <aaron.williams@caviumnetworks.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index aa76f6c..6039e1f 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -581,6 +581,7 @@ static int flash_status_check (flash_info_t * info, flash_sect_t sector, prompt, info->start[sector], flash_read_long (info, sector, 0)); flash_write_cmd (info, sector, 0, info->cmd_reset); + udelay(1); return ERR_TIMOUT; } udelay (1); /* also triggers watchdog */ @@ -628,6 +629,7 @@ static int flash_full_status_check (flash_info_t * info, flash_sect_t sector, puts ("Vpp Low Error.\n"); } flash_write_cmd (info, sector, 0, info->cmd_reset); + udelay(1); break; default: break; @@ -1491,6 +1493,7 @@ void flash_read_user_serial (flash_info_t * info, void *buffer, int offset, flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID); memcpy (dst, src + offset, len); flash_write_cmd (info, 0, 0, info->cmd_reset); + udelay(1); flash_unmap(info, 0, FLASH_OFFSET_USER_PROTECTION, src); } @@ -1506,6 +1509,7 @@ void flash_read_factory_serial (flash_info_t * info, void *buffer, int offset, flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID); memcpy (buffer, src + offset, len); flash_write_cmd (info, 0, 0, info->cmd_reset); + udelay(1); flash_unmap(info, 0, FLASH_OFFSET_INTEL_PROTECTION, src); } @@ -1537,6 +1541,7 @@ static void cfi_reverse_geometry(struct cfi_qry *qry) static void cmdset_intel_read_jedec_ids(flash_info_t *info) { flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); + udelay(1); flash_write_cmd(info, 0, 0, FLASH_CMD_READ_ID); udelay(1000); /* some flash are slow to respond */ info->manufacturer_id = flash_read_uchar (info, @@ -1613,6 +1618,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info) break; } flash_write_cmd(info, 0, 0, AMD_CMD_RESET); + udelay(1); } static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry) @@ -1739,6 +1745,7 @@ void __flash_cmd_reset(flash_info_t *info) * that AMD flash roms ignore the Intel command. */ flash_write_cmd(info, 0, 0, AMD_CMD_RESET); + udelay(1); flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); } void flash_cmd_reset(flash_info_t *info) |