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sf: Read flash bank addr register at probe time

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Read the flash bank addr register to get the state of bank in
a perticular flash. and also bank write happens only when there is
a change in bank selection from user.

bank read only valid for flashes which has > 16Mbytes those are
opearted in 3-byte addr mode, each bank occupies 16Mytes.

Suppose if the flash has 64Mbytes size consists of 4 banks like
bank0, bank1, bank2 and bank3.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jagannadha Sutradharudu Teki 2013-06-19 15:37:09 +05:30
parent cf6b11dcda
commit e612ddf593
3 changed files with 31 additions and 0 deletions
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2
include/spi_flash.h
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@ -42,6 +42,8 @@ struct spi_flash {
u8 bank_read_cmd;
/* Bank write cmd */
u8 bank_write_cmd;
/* Current flash bank */
u8 bank_curr;
void *memory_map; /* Address of read-only SPI flash access */
int (*read)(struct spi_flash *flash, u32 offset,