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authorJagannadha Sutradharudu Teki <jaganna@xilinx.com>2014-01-11 16:50:45 +0530
committerJagannadha Sutradharudu Teki <jaganna@xilinx.com>2014-01-11 16:50:45 +0530
commitff063ed4808e4ead3021eaf53ee4fdb80c9e91f8 (patch)
tree048ac50a568a8d739a9a8528bbaf7018c27b6aa3 /drivers/mtd
parentc4ba0d82d329791c3f0456d88e93032b11e48535 (diff)
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sf: Discover read dummy_byte
Discovered the read dummy_byte based on the configured read command. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/spi/sf_internal.h2
-rw-r--r--drivers/mtd/spi/sf_ops.c16
-rw-r--r--drivers/mtd/spi/sf_probe.c19
3 files changed, 30 insertions, 7 deletions
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 7be0292..a9f5a81 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -10,6 +10,8 @@
#ifndef _SF_INTERNAL_H_
#define _SF_INTERNAL_H_
+#define SPI_FLASH_3B_ADDR_LEN 3
+#define SPI_FLASH_CMD_LEN (1 + SPI_FLASH_3B_ADDR_LEN)
#define SPI_FLASH_16MB_BOUN 0x1000000
/* CFI Manufacture ID's */
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index 827f719..6adee32 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -9,6 +9,7 @@
*/
#include <common.h>
+#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
#include <watchdog.h>
@@ -216,7 +217,7 @@ int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len)
{
u32 erase_size;
- u8 cmd[4];
+ u8 cmd[SPI_FLASH_CMD_LEN];
int ret = -1;
erase_size = flash->erase_size;
@@ -255,7 +256,7 @@ int spi_flash_cmd_write_ops(struct spi_flash *flash, u32 offset,
{
unsigned long byte_addr, page_size;
size_t chunk_len, actual;
- u8 cmd[4];
+ u8 cmd[SPI_FLASH_CMD_LEN];
int ret = -1;
page_size = flash->page_size;
@@ -317,7 +318,7 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
size_t len, void *data)
{
- u8 cmd[5], bank_sel = 0;
+ u8 *cmd, cmdsz, bank_sel = 0;
u32 remain_len, read_len;
int ret = -1;
@@ -335,9 +336,11 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
return 0;
}
- cmd[0] = flash->read_cmd;
- cmd[4] = 0x00;
+ cmdsz = SPI_FLASH_CMD_LEN + flash->dummy_byte;
+ cmd = malloc(cmdsz);
+ memset(cmd, 0, cmdsz);
+ cmd[0] = flash->read_cmd;
while (len) {
#ifdef CONFIG_SPI_FLASH_BAR
bank_sel = offset / SPI_FLASH_16MB_BOUN;
@@ -356,8 +359,7 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
spi_flash_addr(offset, cmd);
- ret = spi_flash_read_common(flash, cmd, sizeof(cmd),
- data, read_len);
+ ret = spi_flash_read_common(flash, cmd, cmdsz, data, read_len);
if (ret < 0) {
debug("SF: read failed\n");
break;
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index a049e72..8bd06ee 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -140,6 +140,25 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
}
}
+ /* Read dummy_byte: dummy byte is determined based on the
+ * dummy cycles of a particular command.
+ * Fast commands - dummy_byte = dummy_cycles/8
+ * I/O commands- dummy_byte = (dummy_cycles * no.of lines)/8
+ * For I/O commands except cmd[0] everything goes on no.of lines
+ * based on particular command but incase of fast commands except
+ * data all go on single line irrespective of command.
+ */
+ switch (flash->read_cmd) {
+ case CMD_READ_QUAD_IO_FAST:
+ flash->dummy_byte = 2;
+ break;
+ case CMD_READ_ARRAY_SLOW:
+ flash->dummy_byte = 0;
+ break;
+ default:
+ flash->dummy_byte = 1;
+ }
+
/* Poll cmd seclection */
flash->poll_cmd = CMD_READ_STATUS;
#ifdef CONFIG_SPI_FLASH_STMICRO