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| author | Marek Vasut <marek.vasut@gmail.com> | 2021-04-11 20:47:45 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2021-04-28 10:29:36 +0200 |
| commit | 94657482f3fb64de124cc68b14c869a6836eaaf3 (patch) | |
| tree | 76515e059e1a19c50068ec0cd8b65509c9e160a8 /drivers/mtd | |
| parent | 79b0f08d6af498e6fda8cd257d62e2095764410c (diff) | |
| download | u-boot-94657482f3fb64de124cc68b14c869a6836eaaf3.zip u-boot-94657482f3fb64de124cc68b14c869a6836eaaf3.tar.gz u-boot-94657482f3fb64de124cc68b14c869a6836eaaf3.tar.bz2 | |
mtd: cfi: Fix PPB lock status readout
According to S26KL512S datasheet [1] and S29GL01GS datasheet [2],
the procedure to read out PPB lock bits is to send the PPB Entry,
PPB Read, Reset/ASO Exit. Currently, the code does send incorrect
PPB Entry, PPB Read and Reset/ASO Exit is completely missing.
The PPB Entry sent is implemented by sending flash_unlock_seq()
and flash_write_cmd(..., FLASH_CMD_READ_ID). This translates to
sequence 0x555:0xaa, 0x2aa:0x55, 0x555:0x90=FLASH_CMD_READ_ID.
However, both [1] and [2] specify the last byte of PPB Entry as
0xc0=AMD_CMD_SET_PPB_ENTRY instead of 0x90=FLASH_CMD_READ_ID,
that is 0x555:0xaa, 0x2aa:0x55, 0x555:0xc0=AMD_CMD_SET_PPB_ENTRY.
Since this does make sense, this patch fixes it and thus also
aligns the code in flash_get_size() with flash_real_protect().
The PPB Read returns 00h in case of Protected state and 01h in case
of Unprotected state, according to [1] Note 83 and [2] Note 17, so
invert the result. Moreover, align the arguments with similar code
in flash_real_protect().
Finally, Reset/ASO Exit command should be executed to exit the PPB
mode, so add the missing reset.
[1] https://www.cypress.com/file/213346/download
Document Number: 001-99198 Rev. *M
Table 40. Command Definitions, Nonvolatile Sector Protection
Command Set Definitions
[2] https://www.cypress.com/file/177976/download
Document Number: 001-98285 Rev. *R
Table 7.1 Command Definitions, Nonvolatile Sector Protection
Command Set Definitions
Fixes: 03deff433e ("cfi_flash: Read PPB sector protection from device for AMD/Spansion chips")
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Stefan Roese <sr@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 9642d7c..9c27fea 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -2276,12 +2276,12 @@ ulong flash_get_size(phys_addr_t base, int banknum) flash_unlock_seq(info, 0); flash_write_cmd(info, 0, info->addr_unlock1, - FLASH_CMD_READ_ID); + AMD_CMD_SET_PPB_ENTRY); info->protect[sect_cnt] = - flash_isset( - info, sect_cnt, - FLASH_OFFSET_PROTECT, - FLASH_STATUS_PROTECT); + !flash_isset(info, sect_cnt, + 0, 0x01); + flash_write_cmd(info, 0, 0, + info->cmd_reset); break; default: /* default: not protected */ |