sf: Add FSR support to spi_flash_cmd_wait_ready

This patch adds flag status register reading support to
spi_flash_cmd_wait_ready.

Cc: Simon Glass <sjg@chromium.org>
Cc: Marek Vasut <marex@denx.de>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Tom Warren <twarren@nvidia.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Hou Zhiqiang <B48286@freescale.com>
Tested-by: Jagan Teki <jteki@openedev.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>

drivers/mtd/spi/sf_internal.h

@@ -53,6 +53,7 @@ enum {
 
 enum spi_nor_option_flags {
 	SNOR_F_SST_WR		= (1 << 0),
+	SNOR_F_USE_FSR		= (1 << 1),
 };
 
 #define SPI_FLASH_3B_ADDR_LEN		3

drivers/mtd/spi/sf_ops.c

@@ -41,6 +41,20 @@ int spi_flash_cmd_read_status(struct spi_flash *flash, u8 *rs)
 	return 0;
 }
 
+static int read_fsr(struct spi_flash *flash, u8 *fsr)
+{
+	int ret;
+	const u8 cmd = CMD_FLAG_STATUS;
+
+	ret = spi_flash_read_common(flash, &cmd, 1, fsr, 1);
+	if (ret < 0) {
+		debug("SF: fail to read flag status register\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 int spi_flash_cmd_write_status(struct spi_flash *flash, u8 ws)
 {
 	u8 cmd;
@@ -139,22 +153,60 @@ static void spi_flash_dual_flash(struct spi_flash *flash, u32 *addr)
 }
 #endif
 
-int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
+static int spi_flash_sr_ready(struct spi_flash *flash)
 {
 	u8 sr;
+	int ret;
+
+	ret = spi_flash_cmd_read_status(flash, &sr);
+	if (ret < 0)
+		return ret;
+
+	return !(sr & STATUS_WIP);
+}
+
+static int spi_flash_fsr_ready(struct spi_flash *flash)
+{
+	u8 fsr;
+	int ret;
+
+	ret = read_fsr(flash, &fsr);
+	if (ret < 0)
+		return ret;
+
+	return fsr & STATUS_PEC;
+}
+
+static int spi_flash_ready(struct spi_flash *flash)
+{
+	int sr, fsr;
+
+	sr = spi_flash_sr_ready(flash);
+	if (sr < 0)
+		return sr;
+
+	fsr = 1;
+	if (flash->flags & SNOR_F_USE_FSR) {
+		fsr = spi_flash_fsr_ready(flash);
+		if (fsr < 0)
+			return fsr;
+	}
+
+	return sr && fsr;
+}
+
+int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
+{
 	int timebase, ret;
 
 	timebase = get_timer(0);
 
 	while (get_timer(timebase) < timeout) {
-		ret = spi_flash_cmd_read_status(flash, &sr);
+		ret = spi_flash_ready(flash);
 		if (ret < 0)
 			return ret;
-
-		if (!(sr & STATUS_WIP))
+		if (ret)
 			return 0;
-		else
-			break;
 	}
 
 	printf("SF: Timeout!\n");

drivers/mtd/spi/sf_probe.c

@@ -257,11 +257,9 @@ static int spi_flash_validate_params(struct spi_slave *spi, u8 *idcode,
 		flash->dummy_byte = 1;
 	}
 
-	/* Poll cmd selection */
-	flash->poll_cmd = CMD_READ_STATUS;
 #ifdef CONFIG_SPI_FLASH_STMICRO
 	if (params->flags & E_FSR)
-		flash->poll_cmd = CMD_FLAG_STATUS;
+		flash->flags |= SNOR_F_USE_FSR;
 #endif
 
 	/* Configure the BAR - discover bank cmds and read current bank */

include/spi_flash.h

@@ -49,7 +49,6 @@ struct spi_slave;
  * @bank_read_cmd:	Bank read cmd
  * @bank_write_cmd:	Bank write cmd
  * @bank_curr:		Current flash bank
- * @poll_cmd:		Poll cmd - for flash erase/program
  * @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.
@@ -82,7 +81,6 @@ struct spi_flash {
 	u8 bank_write_cmd;
 	u8 bank_curr;
 #endif
-	u8 poll_cmd;
 	u8 erase_cmd;
 	u8 read_cmd;
 	u8 write_cmd;