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sf: Discover read dummy_byte

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Discovered the read dummy_byte based on the
configured read command.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
This commit is contained in:
Jagannadha Sutradharudu Teki 2014-01-11 16:50:45 +05:30
parent c4ba0d82d3
commit ff063ed480
4 changed files with 32 additions and 7 deletions
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2
drivers/mtd/spi/sf_internal.h
View File

@ -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 */

16
drivers/mtd/spi/sf_ops.c
View File

@ -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;

19
drivers/mtd/spi/sf_probe.c
View File

@ -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

2
include/spi_flash.h
View File

@ -72,6 +72,7 @@ extern const struct spi_flash_params spi_flash_params_table[];
* @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 @@ struct spi_flash {
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);