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authorJagannadha Sutradharudu Teki <jaganna@xilinx.com>2014-01-07 00:11:35 +0530
committerJagannadha Sutradharudu Teki <jaganna@xilinx.com>2014-01-12 21:40:22 +0530
commit056fbc73d54df64adcb93c513cba708acb2683bd (patch)
tree4243a3f6eb6f1a2fabc57cdad08031fc4e351cd6 /drivers/mtd
parentf77f469117ab3184ac45683a50dc446265be28cc (diff)
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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>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/spi/sf_ops.c8
-rw-r--r--drivers/mtd/spi/sf_probe.c11
2 files changed, 12 insertions, 7 deletions
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 @@ static int spi_flash_bank(struct spi_flash *flash, u32 offset)
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 @@ static void spi_flash_dual_flash(struct spi_flash *flash, u32 *addr)
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 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
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
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index b9e14c5..48de7c1 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -146,19 +146,20 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
flash->read = spi_flash_cmd_read_ops;
/* Compute the flash size */
- flash->page_size = (ext_jedec == 0x4d00) ? 512 : 256;
- flash->sector_size = params->sector_size;
- flash->size = flash->sector_size * params->nr_sectors;
+ flash->shift = (flash->dual_flash & SF_DUAL_PARALLEL_FLASH) ? 1 : 0;
+ flash->page_size = ((ext_jedec == 0x4d00) ? 512 : 256) << flash->shift;
+ flash->sector_size = params->sector_size << flash->shift;
+ flash->size = flash->sector_size * params->nr_sectors << flash->shift;
if (flash->dual_flash & SF_DUAL_STACKED_FLASH)
flash->size <<= 1;
/* Compute erase sector and command */
if (params->flags & SECT_4K) {
flash->erase_cmd = CMD_ERASE_4K;
- flash->erase_size = 4096;
+ flash->erase_size = 4096 << flash->shift;
} else if (params->flags & SECT_32K) {
flash->erase_cmd = CMD_ERASE_32K;
- flash->erase_size = 32768;
+ flash->erase_size = 32768 << flash->shift;
} else {
flash->erase_cmd = CMD_ERASE_64K;
flash->erase_size = flash->sector_size;