diff options
| author | Marek Vasut | 2017-09-12 19:09:31 +0200 |
|---|---|---|
| committer | Stefan Roese | 2017-09-26 10:57:53 +0200 |
| commit | 72443c7f7d2174903e73ee88dcb4364e0387bbb2 (patch) | |
| tree | 2444e445363b16d59c133d1b2aa4a05917033642 | |
| parent | 1ec0a37e1cf2add5680b8d7305922c8210c3e2ed (diff) | |
mtd: cfi: Add support for status register polling
The status register is optional in the AMD command sets, but it's
presence can be checked by reading out CFI table entry 0xc bit 0.
If the register is present, prefer using it's bit 7 to determine
if the flash is busy over reading the flash ; this is needed ie.
on Hyperflash memories.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 15 | ||||
| -rw-r--r-- | include/flash.h | 1 | ||||
| -rw-r--r-- | include/mtd/cfi_flash.h | 1 |
3 files changed, 16 insertions, 1 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index df04a425e20..8a5babea7b3 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -544,7 +544,16 @@ static int flash_is_busy (flash_info_t * info, flash_sect_t sect) #ifdef CONFIG_FLASH_CFI_LEGACY case CFI_CMDSET_AMD_LEGACY: #endif - retval = flash_toggle (info, sect, 0, AMD_STATUS_TOGGLE); + if (info->sr_supported) { + flash_write_cmd (info, sect, info->addr_unlock1, + FLASH_CMD_READ_STATUS); + retval = !flash_isset (info, sect, 0, + FLASH_STATUS_DONE); + } else { + retval = flash_toggle (info, sect, 0, + AMD_STATUS_TOGGLE); + } + break; default: retval = 0; @@ -1685,6 +1694,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info) { ushort bankId = 0; uchar manuId; + uchar lsbits; flash_write_cmd(info, 0, 0, AMD_CMD_RESET); flash_unlock_seq(info, 0); @@ -1700,6 +1710,9 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info) } info->manufacturer_id = manuId; + lsbits = flash_read_uchar(info, FLASH_OFFSET_LOWER_SW_BITS); + info->sr_supported = lsbits & BIT(0); + switch (info->chipwidth){ case FLASH_CFI_8BIT: info->device_id = flash_read_uchar (info, diff --git a/include/flash.h b/include/flash.h index 0eedb1efa89..dc67cb2df61 100644 --- a/include/flash.h +++ b/include/flash.h @@ -42,6 +42,7 @@ typedef struct { ushort cfi_offset; /* offset for cfi query */ ulong addr_unlock1; /* unlock address 1 for AMD flash roms */ ulong addr_unlock2; /* unlock address 2 for AMD flash roms */ + uchar sr_supported; /* status register supported */ const char *name; /* human-readable name */ #endif #ifdef CONFIG_MTD diff --git a/include/mtd/cfi_flash.h b/include/mtd/cfi_flash.h index eade2b3614f..095725a805e 100644 --- a/include/mtd/cfi_flash.h +++ b/include/mtd/cfi_flash.h @@ -62,6 +62,7 @@ #define FLASH_OFFSET_MANUFACTURER_ID 0x00 #define FLASH_OFFSET_DEVICE_ID 0x01 +#define FLASH_OFFSET_LOWER_SW_BITS 0x0C #define FLASH_OFFSET_DEVICE_ID2 0x0E #define FLASH_OFFSET_DEVICE_ID3 0x0F #define FLASH_OFFSET_CFI 0x55 |