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sf: Add bank address register writing support 

This patch provides support to program a flash bank address
register.

extended/bank address register contains an information to access
the 4th byte addressing in 3-byte address mode.

reff' the spec for more details about bank addr register
in Page-63, Table 8.16
http://www.spansion.com/Support/Datasheets/S25FL128S_256S_00.pdf

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jagannadha Sutradharudu Teki 2013-06-13 20:37:19 +05:30
parent 9675fed474
commit c9fcb59d7d
2 changed files with 29 additions and 0 deletions
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26
drivers/mtd/spi/spi_flash.c
View File

@ -278,6 +278,32 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
return 0;
}
int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
{
u8 cmd;
int ret;
ret = spi_flash_cmd_write_enable(flash);
if (ret < 0) {
debug("SF: enabling write failed\n");
return ret;
}
ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &bank_sel, 1);
if (ret) {
debug("SF: fail to write bank addr register\n");
return ret;
}
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret < 0) {
debug("SF: write bank addr register timed out\n");
return ret;
}
return 0;
}
#ifdef CONFIG_OF_CONTROL
int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
{

3
drivers/mtd/spi/spi_flash_internal.h
View File

@ -77,6 +77,9 @@ static inline int spi_flash_cmd_write_disable(struct spi_flash *flash)
/* Program the status register. */
int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
/* Program the bank address register */
int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel);
/*
* Same as spi_flash_cmd_read() except it also claims/releases the SPI
* bus. Used as common part of the ->read() operation.