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>
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_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 @@
{
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_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 @@
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 @@
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 @@
}
}
+ /* 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
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 99724a0..437937c 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -72,6 +72,7 @@
* @erase_cmd: Erase cmd 4K, 32K, 64K
* @read_cmd: Read cmd - Array Fast, Extn read and quad read.
* @write_cmd: Write cmd - page and quad program.
+ * @dummy_byte: Dummy cycles for read operation.
* @memory_map: Address of read-only SPI flash access
* @read: Flash read ops: Read len bytes at offset into buf
* Supported cmds: Fast Array Read
@@ -98,6 +99,7 @@
u8 erase_cmd;
u8 read_cmd;
u8 write_cmd;
+ u8 dummy_byte;
void *memory_map;
int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);