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sf: Add spi_flash_read_bar

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Add spi_flash_read_bar function for reading bar and
discovering bar commands at probe time.

Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Jagan Teki 2015-09-02 11:39:47 +05:30
parent 3c75ade2b3
commit 234a9e1c60
1 changed files with 34 additions and 19 deletions
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53
drivers/mtd/spi/sf_probe.c
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@ -99,6 +99,37 @@ static int spi_flash_set_qeb(struct spi_flash *flash, u8 idcode0)
}
}
#ifdef CONFIG_SPI_FLASH_BAR
static int spi_flash_read_bank(struct spi_flash *flash, u8 idcode0)
{
u8 curr_bank = 0;
int ret;
if (flash->size <= SPI_FLASH_16MB_BOUN)
goto bank_end;
switch (idcode0) {
case SPI_FLASH_CFI_MFR_SPANSION:
flash->bank_read_cmd = CMD_BANKADDR_BRRD;
flash->bank_write_cmd = CMD_BANKADDR_BRWR;
default:
flash->bank_read_cmd = CMD_EXTNADDR_RDEAR;
flash->bank_write_cmd = CMD_EXTNADDR_WREAR;
}
ret = spi_flash_read_common(flash, &flash->bank_read_cmd, 1,
&curr_bank, 1);
if (ret) {
debug("SF: fail to read bank addr register\n");
return ret;
}
bank_end:
flash->bank_curr = curr_bank;
return 0;
}
#endif
static int spi_flash_validate_params(struct spi_slave *spi, u8 *idcode,
struct spi_flash *flash)
{
@ -235,25 +266,9 @@ static int spi_flash_validate_params(struct spi_slave *spi, u8 *idcode,
/* Configure the BAR - discover bank cmds and read current bank */
#ifdef CONFIG_SPI_FLASH_BAR
u8 curr_bank = 0;
if (flash->size > SPI_FLASH_16MB_BOUN) {
int ret;
flash->bank_read_cmd = (idcode[0] == 0x01) ?
CMD_BANKADDR_BRRD : CMD_EXTNADDR_RDEAR;
flash->bank_write_cmd = (idcode[0] == 0x01) ?
CMD_BANKADDR_BRWR : CMD_EXTNADDR_WREAR;
ret = spi_flash_read_common(flash, &flash->bank_read_cmd, 1,
&curr_bank, 1);
if (ret) {
debug("SF: fail to read bank addr register\n");
return ret;
}
flash->bank_curr = curr_bank;
} else {
flash->bank_curr = curr_bank;
}
int ret = spi_flash_read_bank(flash, idcode[0]);
if (ret < 0)
return ret;
#endif
/* Flash powers up read-only, so clear BP# bits */