sf: Add dual memories support - DUAL_PARALLEL
This patch added support for accessing dual memories in
parallel connection with single chipselect line from controller.
For more info - see doc/SPI/README.dual-flash
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index e877858..843f379 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -119,7 +119,7 @@
u8 bank_sel;
int ret;
- bank_sel = offset / SPI_FLASH_16MB_BOUN;
+ bank_sel = offset / (SPI_FLASH_16MB_BOUN << flash->shift);
ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
if (ret) {
@@ -142,6 +142,9 @@
flash->spi->flags &= ~SPI_XFER_U_PAGE;
}
break;
+ case SF_DUAL_PARALLEL_FLASH:
+ *addr >>= flash->shift;
+ break;
default:
debug("SF: Unsupported dual_flash=%d\n", flash->dual_flash);
break;
@@ -388,7 +391,8 @@
if (bank_sel < 0)
return ret;
#endif
- remain_len = (SPI_FLASH_16MB_BOUN * (bank_sel + 1)) - offset;
+ remain_len = ((SPI_FLASH_16MB_BOUN << flash->shift) *
+ (bank_sel + 1)) - offset;
if (len < remain_len)
read_len = len;
else