From: Hou Zhiqiang B48286@freescale.com
Enter 3 Byte address mode at first, because it may change to 4 Byte address mode in kernel driver and not reset to 3 Byte address mode after reboot.
Add clear flag status register operation that some Micron SPI flash chips required after reading the flag status register to check some operations completion.
Signed-off-by: Hou Zhiqiang B48286@freescale.com Signed-off-by: Mingkai.Hu Mingkai.Hu@freescale.com --- V3: Generate the patch based on the latest tree git://git.denx.de/u-boot.git.
V2: Add the operation of enter 3 Byte address mode in probe.
V1: Based on git://git.denx.de/u-boot.git. Also can be applied to git://www.denx.de/git/u-boot-mpc85xx.git. Tested on board T2080QDS and T2080RDB.
drivers/mtd/spi/sf_internal.h | 17 ++++++++++++ drivers/mtd/spi/sf_ops.c | 64 +++++++++++++++++++++++++++++++++++++------ drivers/mtd/spi/sf_probe.c | 5 ++++ 3 files changed, 78 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h index 4158e13..24a693e 100644 --- a/drivers/mtd/spi/sf_internal.h +++ b/drivers/mtd/spi/sf_internal.h @@ -73,6 +73,11 @@ enum { #define CMD_WRITE_ENABLE 0x06 #define CMD_READ_CONFIG 0x35 #define CMD_FLAG_STATUS 0x70 +#define CMD_CLEAR_FLAG_STATUS 0x50 + +/* Used for Macronix and Winbond flashes */ +#define CMD_ENTER_4B_ADDR 0xB7 +#define CMD_EXIT_4B_ADDR 0xE9
/* Read commands */ #define CMD_READ_ARRAY_SLOW 0x03 @@ -96,6 +101,8 @@ enum { #define STATUS_QEB_WINSPAN (1 << 1) #define STATUS_QEB_MXIC (1 << 6) #define STATUS_PEC (1 << 7) +#define STATUS_PROT (1 << 1) +#define STATUS_ERASE (1 << 5)
/* Flash timeout values */ #define SPI_FLASH_PROG_TIMEOUT (2 * CONFIG_SYS_HZ) @@ -182,6 +189,12 @@ static inline int spi_flash_cmd_write_disable(struct spi_flash *flash) return spi_flash_cmd(flash->spi, CMD_WRITE_DISABLE, NULL, 0); }
+/* Clear flag status register */ +static inline int spi_flash_cmd_clear_flag_status(struct spi_slave *spi) +{ + return spi_flash_cmd(spi, CMD_CLEAR_FLAG_STATUS, NULL, 0); +} + /* * Send the read status command to the device and wait for the wip * (write-in-progress) bit to clear itself. @@ -218,4 +231,8 @@ 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);
+#if defined(CONFIG_SPI_FLASH_STMICRO) +int spi_flash_cmd_4B_addr_switch(struct spi_flash *flash, int enable); +#endif + #endif /* _SF_INTERNAL_H_ */ diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c index 38592f5..1ce14d1 100644 --- a/drivers/mtd/spi/sf_ops.c +++ b/drivers/mtd/spi/sf_ops.c @@ -93,6 +93,30 @@ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 wc) } #endif
+#if defined(CONFIG_SPI_FLASH_STMICRO) +int spi_flash_cmd_4B_addr_switch(struct spi_flash *flash, int enable) +{ + int ret; + u8 cmd; + + cmd = enable ? CMD_ENTER_4B_ADDR : CMD_EXIT_4B_ADDR; + + ret = spi_claim_bus(flash->spi); + if (ret) { + debug("SF: unable to claim SPI bus\n"); + return ret; + } + + ret = spi_flash_cmd_write_enable(flash); + if (ret < 0) { + debug("SF: enabling write failed\n"); + return ret; + } + + return spi_flash_cmd(flash->spi, cmd, NULL, 0); +} +#endif + #ifdef CONFIG_SPI_FLASH_BAR static int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel) { @@ -160,6 +184,7 @@ static int spi_flash_poll_status(struct spi_slave *spi, unsigned long timeout, unsigned long timebase; unsigned long flags = SPI_XFER_BEGIN; int ret; + int out_of_time = 1; u8 status; u8 check_status = 0x0;
@@ -182,22 +207,45 @@ static int spi_flash_poll_status(struct spi_slave *spi, unsigned long timeout, WATCHDOG_RESET();
ret = spi_xfer(spi, 8, NULL, &status, 0); - if (ret) + if (ret) { + spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END); return -1; + }
- if ((status & poll_bit) == check_status) + if ((status & poll_bit) == check_status) { + out_of_time = 0; break; + }
} while (get_timer(timebase) < timeout);
spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
- if ((status & poll_bit) == check_status) - return 0; + if (out_of_time) { + /* Timed out */ + debug("SF: time out!\n"); + if (cmd == CMD_FLAG_STATUS) { + if (spi_flash_cmd_clear_flag_status(spi) < 0) + debug("SF: clear flag status failed\n"); + } + ret = -1; + } +#ifdef CONFIG_SPI_FLASH_STMICRO + else if (cmd == CMD_FLAG_STATUS) { + if (!(status & (STATUS_PROT | STATUS_ERASE))) { + ret = 0; + } else { + debug("SF: flag status error"); + ret = -1; + }
- /* Timed out */ - debug("SF: time out!\n"); - return -1; + if (spi_flash_cmd_clear_flag_status(spi) < 0) { + debug("SF: clear flag status failed\n"); + ret = -1; + } + } +#endif + return ret; }
int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout) @@ -252,7 +300,7 @@ int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
ret = spi_flash_cmd_wait_ready(flash, timeout); if (ret < 0) { - debug("SF: write %s timed out\n", + debug("SF: write %s failed\n", timeout == SPI_FLASH_PROG_TIMEOUT ? "program" : "page erase"); return ret; diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 201471c..abe148f 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -231,6 +231,11 @@ static int spi_flash_validate_params(struct spi_slave *spi, u8 *idcode, #ifdef CONFIG_SPI_FLASH_STMICRO if (params->flags & E_FSR) flash->poll_cmd = CMD_FLAG_STATUS; + + if (flash->size > SPI_FLASH_16MB_BOUN) { + if (spi_flash_cmd_4B_addr_switch(flash, 0) < 0) + debug("SF: enter 3B address mode failed\n"); + } #endif
/* Configure the BAR - discover bank cmds and read current bank */