OpenWrt – Rev 1
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From 3af3addee645bd81537be1ddee49969f8dfc64ee Mon Sep 17 00:00:00 2001
From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Date: Sun, 13 Oct 2013 15:24:56 +0200
Subject: sf: add support for 4-byte addressing
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -38,12 +38,14 @@
#define CMD_READ_ID 0x9f
/* Bank addr access commands */
-#ifdef CONFIG_SPI_FLASH_BAR
-# define CMD_BANKADDR_BRWR 0x17
-# define CMD_BANKADDR_BRRD 0x16
-# define CMD_EXTNADDR_WREAR 0xC5
-# define CMD_EXTNADDR_RDEAR 0xC8
-#endif
+#define CMD_BANKADDR_BRWR 0x17
+#define CMD_BANKADDR_BRRD 0x16
+#define CMD_EXTNADDR_WREAR 0xC5
+#define CMD_EXTNADDR_RDEAR 0xC8
+
+/* Macronix style 4-byte addressing */
+#define CMD_EN4B 0xb7
+#define CMD_EX4B 0xe9
/* Common status */
#define STATUS_WIP 0x01
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -21,6 +21,7 @@ static void spi_flash_addr(const struct
cmd[1] = addr >> (flash->addr_width * 8 - 8);
cmd[2] = addr >> (flash->addr_width * 8 - 16);
cmd[3] = addr >> (flash->addr_width * 8 - 24);
+ cmd[4] = addr >> (flash->addr_width * 8 - 32);
}
static int spi_flash_cmdsz(const struct spi_flash *flash)
@@ -163,7 +164,7 @@ int spi_flash_write_common(struct spi_fl
int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len)
{
u32 erase_size;
- u8 cmd[4], cmd_len;
+ u8 cmd[5], cmd_len;
int ret = -1;
erase_size = flash->erase_size;
@@ -188,8 +189,8 @@ int spi_flash_cmd_erase_ops(struct spi_f
spi_flash_addr(flash, offset, cmd);
cmd_len = spi_flash_cmdsz(flash);
- debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
- cmd[2], cmd[3], offset);
+ debug("SF: erase %2x %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
+ cmd[2], cmd[3], cmd[4], offset);
ret = spi_flash_write_common(flash, cmd, cmd_len, NULL, 0);
if (ret < 0) {
@@ -212,7 +213,7 @@ int spi_flash_cmd_write_ops(struct spi_f
{
unsigned long byte_addr, page_size;
size_t chunk_len, actual;
- u8 cmd[4], cmd_len;
+ u8 cmd[5], cmd_len;
int ret = -1;
ret = spi_claim_bus(flash->spi);
@@ -239,8 +240,8 @@ int spi_flash_cmd_write_ops(struct spi_f
spi_flash_addr(flash, offset, cmd);
cmd_len = spi_flash_cmdsz(flash);
- debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zu\n",
- buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
+ debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x%02x } chunk_len = %zu\n",
+ buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], cmd[4], chunk_len);
ret = spi_flash_write_common(flash, cmd, cmd_len,
buf + actual, chunk_len);
@@ -276,9 +277,13 @@ int spi_flash_read_common(struct spi_fla
int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
size_t len, void *data)
{
- u8 cmd[5], cmd_len, bank_sel = 0;
- u32 remain_len, read_len;
+ u8 cmd[6], cmd_len;
+ u32 read_len;
int ret = -1;
+#ifdef CONFIG_SPI_FLASH_BAR
+ u8 bank_sel = 0;
+ u32 remain_len;
+#endif
ret = spi_claim_bus(flash->spi);
if (ret) {
@@ -305,12 +310,15 @@ int spi_flash_cmd_read_ops(struct spi_fl
debug("SF: fail to set bank%d\n", bank_sel);
goto done;
}
-#endif
+
remain_len = (SPI_FLASH_16MB_BOUN * (bank_sel + 1)) - offset;
if (len < remain_len)
read_len = len;
else
read_len = remain_len;
+#else
+ read_len = len;
+#endif
spi_flash_addr(flash, offset, cmd);
cmd_len = spi_flash_cmdsz(flash);
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -153,6 +153,25 @@ static const struct spi_flash_params spi
*/
};
+int spi_flash_4byte_set(struct spi_flash *flash, u8 idcode0, int enable)
+{
+ u8 cmd, bankaddr;
+
+ switch (idcode0) {
+ case 0xc2:
+ case 0xef:
+ case 0x1c:
+ /* Macronix style */
+ cmd = enable ? CMD_EN4B : CMD_EX4B;
+ return spi_flash_cmd(flash->spi, cmd, NULL, 0);
+ default:
+ /* Spansion style */
+ cmd = CMD_BANKADDR_BRWR;
+ bankaddr = enable << 7;
+ return spi_flash_cmd_write(flash->spi, &cmd, 1, &bankaddr, 1);
+ }
+}
+
static int spi_flash_validate_params(struct spi_flash *flash,
u8 *idcode)
{
@@ -218,8 +237,18 @@ static int spi_flash_validate_params(str
flash->poll_cmd = CMD_FLAG_STATUS;
#endif
+#ifndef CONFIG_SPI_FLASH_BAR
+ /* enable 4-byte addressing if the device exceeds 16MiB */
+ if (flash->size > SPI_FLASH_16MB_BOUN) {
+ flash->addr_width = 4;
+ spi_flash_4byte_set(flash, idcode[0], 1);
+ } else {
+ flash->addr_width = 3;
+ }
+#else
/* Configure default 3-byte addressing */
flash->addr_width = 3;
+#endif
/* Configure the BAR - discover bank cmds and read current bank */
#ifdef CONFIG_SPI_FLASH_BAR