Hi,
I've made two changes while I was working on STMidro's SPI Flash N25Q512A
- add the device entry for STMidro's SPI Flash N25Q512A
- add Flag status check during
Without this flag checking "sf write" will fail and SPI flash is locked
up
Please see the patch and let me know your feedback.
-------------------------------------
>From 97572b32c49d06ca6f8548ed88e6e381fb719a08 Mon Sep 17 00:00:00 2001
From: Insop Song <insop.s...@cohere.net>
Date: Sun, 2 Jun 2013 13:33:37 -0700
Subject: [PATCH] Add SPI Flash STMicro's N25Q512A & add flag status check
during SPI Flash write
Signed-off-by: Insop Song <insop.s...@cohere.net>
---
drivers/mtd/spi/spi_flash.c | 25 +++++++++++++++++++++++++
drivers/mtd/spi/spi_flash_internal.h | 1 +
drivers/mtd/spi/stmicro.c | 6 ++++++
3 files changed, 32 insertions(+)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 00aece9..f53756d 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -72,6 +72,7 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32
offset,
size_t chunk_len, actual;
int ret;
u8 cmd[4];
+ u8 flag_status;
page_size = flash->page_size;
page_addr = offset / page_size;
@@ -83,6 +84,18 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32
offset,
return ret;
}
+wait_flag:
+ ret = spi_flash_cmd(flash->spi, CMD_READ_FLAG_STATUS, &flag_status,
sizeof(flag_status));
+ if (ret < 0) {
+ printf("SF: reading flag failed\n");
+ return ret;
+ }
+ debug("flag_status %d\n", flag_status);
+ if ((flag_status & 0x80) == 0) {
+ udelay(10);
+ goto wait_flag;
+ }
+
cmd[0] = CMD_PAGE_PROGRAM;
for (actual = 0; actual < len; actual += chunk_len) {
chunk_len = min(len - actual, page_size - byte_addr);
@@ -106,6 +119,18 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32
offset,
debug("SF: write failed\n");
break;
}
+ /* check status */
+flag_check:
+ ret = spi_flash_cmd(flash->spi, CMD_READ_FLAG_STATUS,
&flag_status, sizeof(flag_status));
+ if (ret < 0) {
+ printf("SF: reading flag failed\n");
+ break;
+ }
+ debug("flag_status %d\n", flag_status);
+ if (!(flag_status & 0x80)) {
+ udelay(100);
+ goto flag_check;
+ }
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret)
diff --git a/drivers/mtd/spi/spi_flash_internal.h
b/drivers/mtd/spi/spi_flash_internal.h
index 141cfa8..90b6993 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -22,6 +22,7 @@
#define CMD_PAGE_PROGRAM 0x02
#define CMD_WRITE_DISABLE 0x04
#define CMD_READ_STATUS 0x05
+#define CMD_READ_FLAG_STATUS 0x70
#define CMD_WRITE_ENABLE 0x06
#define CMD_ERASE_4K 0x20
#define CMD_ERASE_32K 0x52
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index 30b626a..ad94ad2 100644
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -110,6 +110,12 @@ static const struct stmicro_spi_flash_params
stmicro_spi_flash_table[] = {
.nr_sectors = 512,
.name = "N25Q256",
},
+ {
+ .id = 0xba20,
+ .pages_per_sector = 256,
+ .nr_sectors = 1024,
+ .name = "N25Q512A",
+ },
};
struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
--
1.7.9.5
0001-Add-SPI-Flash-STMicro-s-N25Q512A-add-flag-status-che.patch
Description: 0001-Add-SPI-Flash-STMicro-s-N25Q512A-add-flag-status-che.patch
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