diff options
| author | Angelo Dureghello <sysamfw@gmail.com> | 2012-12-01 01:14:18 +0100 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2013-01-10 14:39:13 +0100 |
| commit | 07b2c5c0e5abb8b6b996068471024410a7ef4bd4 (patch) | |
| tree | 342e5c444db790da94d826f797cee723d9cfef21 /drivers | |
| parent | 642ef40bdc95bef829ae3aadc217f829c4c298c4 (diff) | |
mtd/cfi: add support for SST 4KB sector granularity
Add support for SST 4KB sector granularity.
Many recent SST flashes, i.e. SST39VF3201B and similar of this family
are declared CFI-conformant from SST. They support CFI query, but implement
2 different sector sizes in the same memory: a 64KB sector (they call it
"block", std AMD erase cmd=0x30), and a 4KB sector (they call it "sector",
erase cmd=0x50). Also, CFI query on these chips, reading from address 0x2dh
of cfi query struct, detects a number of secotrs for the 4KB granularity
(flinfo shows it).
For all other aspects, they are CFI compliant, so, as Linux do, i think
it's a good idea to handle these chips in the CFI driver, with a fixup
to allow 4KB granularity, as should be expected, instead of 64KB.
Signed-off-by: Angelo Dureghello <sysamfw@gmail.com>
Signed-off-by: Stefan Rose <sr@denx.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index b2dfc5369dd..c8099db1443 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -1128,7 +1128,7 @@ int flash_erase (flash_info_t * info, int s_first, int s_last) AMD_CMD_ERASE_START); flash_unlock_seq (info, sect); flash_write_cmd (info, sect, 0, - AMD_CMD_ERASE_SECTOR); + info->cmd_erase_sector); break; #ifdef CONFIG_FLASH_CFI_LEGACY case CFI_CMDSET_AMD_LEGACY: @@ -1733,6 +1733,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info) static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry) { info->cmd_reset = AMD_CMD_RESET; + info->cmd_erase_sector = AMD_CMD_ERASE_SECTOR; cmdset_amd_read_jedec_ids(info); flash_write_cmd(info, 0, info->cfi_offset, FLASH_CMD_CFI); @@ -2003,6 +2004,25 @@ static void flash_fixup_stm(flash_info_t *info, struct cfi_qry *qry) } } +static void flash_fixup_sst(flash_info_t *info, struct cfi_qry *qry) +{ + /* + * SST, for many recent nor parallel flashes, says they are + * CFI-conformant. This is not true, since qry struct. + * reports a std. AMD command set (0x0002), while SST allows to + * erase two different sector sizes for the same memory. + * 64KB sector (SST call it block) needs 0x30 to be erased. + * 4KB sector (SST call it sector) needs 0x50 to be erased. + * Since CFI query detect the 4KB number of sectors, users expects + * a sector granularity of 4KB, and it is here set. + */ + if (info->device_id == 0x5D23 || /* SST39VF3201B */ + info->device_id == 0x5C23) { /* SST39VF3202B */ + /* set sector granularity to 4KB */ + info->cmd_erase_sector=0x50; + } +} + /* * The following code cannot be run from FLASH! * @@ -2081,6 +2101,9 @@ ulong flash_get_size (phys_addr_t base, int banknum) case 0x0020: flash_fixup_stm(info, &qry); break; + case 0x00bf: /* SST */ + flash_fixup_sst(info, &qry); + break; } debug ("manufacturer is %d\n", info->vendor); |