From patchwork Fri Mar 1 11:24:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot] mtd: cfi_flash: Write buffer size adjustment for M29EW Numonyx devices From: Jagannadha Sutradharudu Teki X-Patchwork-Id: 224289 Message-Id: <52ae4e86-c353-4c13-ab4a-4127c01e2a34@CO9EHSMHS026.ehs.local> To: Cc: Jagannadha@theia.denx.de, Stefan Roese , Sutradharudu Teki Date: Fri, 1 Mar 2013 16:54:26 +0530 This patch addjusted the write buffer size for M29EW devices those are operated in 8-bit mode. The M29EW devices seem to report the CFI information wrong when it's in 8 bit mode. There's an app note from Numonyx on this issue and there's a patch in the open source as well for Linux, but it doesn't seem to be in mainline. Signed-off-by: Jagannadha Sutradharudu Teki Tested-by: Jagannadha Sutradharudu Teki --- drivers/mtd/cfi_flash.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 6b9fc1a..328c76d 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -2053,6 +2053,26 @@ static void flash_fixup_sst(flash_info_t *info, struct cfi_qry *qry) } } +static void flash_fixup_num(flash_info_t *info, struct cfi_qry *qry) +{ + /* + * The M29EW devices seem to report the CFI information wrong + * when it's in 8 bit mode. + * There's an app note from Numonyx on this issue. + * So adjust the buffer size for M29EW while operating in 8-bit mode + */ + if (((qry->max_buf_write_size) > 0x8) && + (info->device_id == 0x7E) && + (info->device_id2 == 0x2201 || + info->device_id2 == 0x2301 || + info->device_id2 == 0x2801 || + info->device_id2 == 0x4801)) { + debug("Adjusted buffer size on Numonyx flash" + " M29EW family in 8 bit mode\n"); + qry->max_buf_write_size = 0x8; + } +} + /* * The following code cannot be run from FLASH! * @@ -2135,6 +2155,9 @@ ulong flash_get_size (phys_addr_t base, int banknum) case 0x00bf: /* SST */ flash_fixup_sst(info, &qry); break; + case 0x0089: /* Numonyx */ + flash_fixup_num(info, &qry); + break; } debug ("manufacturer is %d\n", info->vendor);