sf: Add extended read commands support

Current sf uses FAST_READ command, this patch adds support to
use the different/extended read command.

This implementation will determine the fastest command by taking
the supported commands from the flash and the controller, controller
is always been a priority.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

5 files changed, 126 insertions, 86 deletions

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index d291746..938a78e 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -36,6 +36,8 @@
 /* Read commands */
 #define CMD_READ_ARRAY_SLOW		0x03
 #define CMD_READ_ARRAY_FAST		0x0b
+#define CMD_READ_DUAL_OUTPUT_FAST	0x3b
+#define CMD_READ_DUAL_IO_FAST		0xbb
 #define CMD_READ_ID			0x9f
 
 /* Bank addr access commands */
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index e316a69..49ceef0 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -285,7 +285,7 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 		return 0;
 	}
 
-	cmd[0] = CMD_READ_ARRAY_FAST;
+	cmd[0] = flash->read_cmd;
 	cmd[4] = 0x00;
 
 	while (len) {
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index b863a98..c0baac6 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -27,6 +27,7 @@ DECLARE_GLOBAL_DATA_PTR;
  * @ext_jedec:		Device ext_jedec ID
  * @sector_size:	Sector size of this device
  * @nr_sectors:		No.of sectors on this device
+ * @e_rd_cmd:		Enum list for read commands
  * @flags:		Importent param, for flash specific behaviour
  */
 struct spi_flash_params {
@@ -35,110 +36,111 @@ struct spi_flash_params {
 	u16 ext_jedec;
 	u32 sector_size;
 	u32 nr_sectors;
+	u8 e_rd_cmd;
 	u16 flags;
 };
 
 static const struct spi_flash_params spi_flash_params_table[] = {
 #ifdef CONFIG_SPI_FLASH_ATMEL		/* ATMEL */
-	{"AT45DB011D",	   0x1f2200, 0x0,	64 * 1024,     4,	       SECT_4K},
-	{"AT45DB021D",	   0x1f2300, 0x0,	64 * 1024,     8,	       SECT_4K},
-	{"AT45DB041D",	   0x1f2400, 0x0,	64 * 1024,     8,	       SECT_4K},
-	{"AT45DB081D",	   0x1f2500, 0x0,	64 * 1024,    16,	       SECT_4K},
-	{"AT45DB161D",	   0x1f2600, 0x0,	64 * 1024,    32,	       SECT_4K},
-	{"AT45DB321D",	   0x1f2700, 0x0,	64 * 1024,    64,	       SECT_4K},
-	{"AT45DB641D",	   0x1f2800, 0x0,	64 * 1024,   128,	       SECT_4K},
-	{"AT25DF321",      0x1f4701, 0x0,	64 * 1024,    64,	       SECT_4K},
+	{"AT45DB011D",	   0x1f2200, 0x0,	64 * 1024,     4,	0,          SECT_4K},
+	{"AT45DB021D",	   0x1f2300, 0x0,	64 * 1024,     8,	0,          SECT_4K},
+	{"AT45DB041D",	   0x1f2400, 0x0,	64 * 1024,     8,	0,          SECT_4K},
+	{"AT45DB081D",	   0x1f2500, 0x0,	64 * 1024,    16,	0,          SECT_4K},
+	{"AT45DB161D",	   0x1f2600, 0x0,	64 * 1024,    32,	0,          SECT_4K},
+	{"AT45DB321D",	   0x1f2700, 0x0,	64 * 1024,    64,	0,          SECT_4K},
+	{"AT45DB641D",	   0x1f2800, 0x0,	64 * 1024,   128,	0,	    SECT_4K},
+	{"AT25DF321",      0x1f4701, 0x0,	64 * 1024,    64,	0,          SECT_4K},
 #endif
 #ifdef CONFIG_SPI_FLASH_EON		/* EON */
-	{"EN25Q32B",	   0x1c3016, 0x0,	64 * 1024,    64,	             0},
-	{"EN25Q64",	   0x1c3017, 0x0,	64 * 1024,   128,	       SECT_4K},
-	{"EN25Q128B",	   0x1c3018, 0x0,       64 * 1024,   256,	             0},
-	{"EN25S64",	   0x1c3817, 0x0,	64 * 1024,   128,		     0},
+	{"EN25Q32B",	   0x1c3016, 0x0,	64 * 1024,    64,	0,                0},
+	{"EN25Q64",	   0x1c3017, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"EN25Q128B",	   0x1c3018, 0x0,       64 * 1024,   256,	0,                0},
+	{"EN25S64",	   0x1c3817, 0x0,	64 * 1024,   128,	0,	          0},
 #endif
 #ifdef CONFIG_SPI_FLASH_GIGADEVICE	/* GIGADEVICE */
-	{"GD25Q64B",	   0xc84017, 0x0,	64 * 1024,   128,	       SECT_4K},
-	{"GD25LQ32",	   0xc86016, 0x0,	64 * 1024,    64,	       SECT_4K},
+	{"GD25Q64B",	   0xc84017, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"GD25LQ32",	   0xc86016, 0x0,	64 * 1024,    64,	0,          SECT_4K},
 #endif
 #ifdef CONFIG_SPI_FLASH_MACRONIX	/* MACRONIX */
-	{"MX25L2006E",	   0xc22012, 0x0,	64 * 1024,     4,	             0},
-	{"MX25L4005",	   0xc22013, 0x0,	64 * 1024,     8,	             0},
-	{"MX25L8005",	   0xc22014, 0x0,	64 * 1024,    16,	             0},
-	{"MX25L1605D",	   0xc22015, 0x0,	64 * 1024,    32,	             0},
-	{"MX25L3205D",	   0xc22016, 0x0,	64 * 1024,    64,	             0},
-	{"MX25L6405D",	   0xc22017, 0x0,	64 * 1024,   128,	             0},
-	{"MX25L12805",	   0xc22018, 0x0,	64 * 1024,   256,	             0},
-	{"MX25L25635F",	   0xc22019, 0x0,	64 * 1024,   512,	             0},
-	{"MX25L51235F",	   0xc2201a, 0x0,	64 * 1024,  1024,	             0},
-	{"MX25L12855E",	   0xc22618, 0x0,	64 * 1024,   256,	             0},
+	{"MX25L2006E",	   0xc22012, 0x0,	64 * 1024,     4,	0,                0},
+	{"MX25L4005",	   0xc22013, 0x0,	64 * 1024,     8,	0,                0},
+	{"MX25L8005",	   0xc22014, 0x0,	64 * 1024,    16,	0,                0},
+	{"MX25L1605D",	   0xc22015, 0x0,	64 * 1024,    32,	0,                0},
+	{"MX25L3205D",	   0xc22016, 0x0,	64 * 1024,    64,	0,                0},
+	{"MX25L6405D",	   0xc22017, 0x0,	64 * 1024,   128,	0,                0},
+	{"MX25L12805",	   0xc22018, 0x0,	64 * 1024,   256,	0,                0},
+	{"MX25L25635F",	   0xc22019, 0x0,	64 * 1024,   512,	0,                0},
+	{"MX25L51235F",	   0xc2201a, 0x0,	64 * 1024,  1024,	0,                0},
+	{"MX25L12855E",	   0xc22618, 0x0,	64 * 1024,   256,	0,                0},
 #endif
 #ifdef CONFIG_SPI_FLASH_SPANSION	/* SPANSION */
-	{"S25FL008A",	   0x010213, 0x0,	64 * 1024,    16,	             0},
-	{"S25FL016A",	   0x010214, 0x0,	64 * 1024,    32,	             0},
-	{"S25FL032A",	   0x010215, 0x0,	64 * 1024,    64,	             0},
-	{"S25FL064A",	   0x010216, 0x0,	64 * 1024,   128,	             0},
-	{"S25FL128P_256K", 0x012018, 0x0300,   256 * 1024,    64,	             0},
-	{"S25FL128P_64K",  0x012018, 0x0301,    64 * 1024,   256,	             0},
-	{"S25FL032P",	   0x010215, 0x4d00,    64 * 1024,    64,	             0},
-	{"S25FL064P",	   0x010216, 0x4d00,    64 * 1024,   128,	             0},
-	{"S25FL128S_64K",  0x012018, 0x4d01,    64 * 1024,   256,		     0},
-	{"S25FL256S_256K", 0x010219, 0x4d00,    64 * 1024,   512,	             0},
-	{"S25FL256S_64K",  0x010219, 0x4d01,    64 * 1024,   512,	             0},
-	{"S25FL512S_256K", 0x010220, 0x4d00,    64 * 1024,  1024,	             0},
-	{"S25FL512S_64K",  0x010220, 0x4d01,    64 * 1024,  1024,	             0},
+	{"S25FL008A",	   0x010213, 0x0,	64 * 1024,    16,	0,                0},
+	{"S25FL016A",	   0x010214, 0x0,	64 * 1024,    32,	0,                0},
+	{"S25FL032A",	   0x010215, 0x0,	64 * 1024,    64,	0,                0},
+	{"S25FL064A",	   0x010216, 0x0,	64 * 1024,   128,	0,                0},
+	{"S25FL128P_256K", 0x012018, 0x0300,   256 * 1024,    64,	0,                0},
+	{"S25FL128P_64K",  0x012018, 0x0301,    64 * 1024,   256,	0,                0},
+	{"S25FL032P",	   0x010215, 0x4d00,    64 * 1024,    64,	0,                0},
+	{"S25FL064P",	   0x010216, 0x4d00,    64 * 1024,   128,	0,                0},
+	{"S25FL128S_64K",  0x012018, 0x4d01,    64 * 1024,   256,	0,	          0},
+	{"S25FL256S_256K", 0x010219, 0x4d00,    64 * 1024,   512, RD_EXTN,		  0},
+	{"S25FL256S_64K",  0x010219, 0x4d01,	64 * 1024,   512, RD_EXTN,		  0},
+	{"S25FL512S_256K", 0x010220, 0x4d00,    64 * 1024,  1024,	0,                0},
+	{"S25FL512S_64K",  0x010220, 0x4d01,    64 * 1024,  1024,	0,                0},
 #endif
 #ifdef CONFIG_SPI_FLASH_STMICRO		/* STMICRO */
-	{"M25P10",	   0x202011, 0x0,       32 * 1024,     4,	             0},
-	{"M25P20",	   0x202012, 0x0,       64 * 1024,     4,	             0},
-	{"M25P40",	   0x202013, 0x0,       64 * 1024,     8,	             0},
-	{"M25P80",	   0x202014, 0x0,       64 * 1024,    16,	             0},
-	{"M25P16",	   0x202015, 0x0,       64 * 1024,    32,	             0},
-	{"M25P32",	   0x202016, 0x0,       64 * 1024,    64,	             0},
-	{"M25P64",	   0x202017, 0x0,       64 * 1024,   128,	             0},
-	{"M25P128",	   0x202018, 0x0,      256 * 1024,    64,	             0},
-	{"N25Q32",	   0x20ba16, 0x0,       64 * 1024,    64,	       SECT_4K},
-	{"N25Q32A",	   0x20bb16, 0x0,       64 * 1024,    64,	       SECT_4K},
-	{"N25Q64",	   0x20ba17, 0x0,       64 * 1024,   128,	       SECT_4K},
-	{"N25Q64A",	   0x20bb17, 0x0,       64 * 1024,   128,	       SECT_4K},
-	{"N25Q128",	   0x20ba18, 0x0,       64 * 1024,   256,	       SECT_4K},
-	{"N25Q128A",	   0x20bb18, 0x0,       64 * 1024,   256,	       SECT_4K},
-	{"N25Q256",	   0x20ba19, 0x0,       64 * 1024,   512,	       SECT_4K},
-	{"N25Q256A",	   0x20bb19, 0x0,       64 * 1024,   512,	       SECT_4K},
-	{"N25Q512",	   0x20ba20, 0x0,       64 * 1024,  1024,      E_FSR | SECT_4K},
-	{"N25Q512A",	   0x20bb20, 0x0,       64 * 1024,  1024,      E_FSR | SECT_4K},
-	{"N25Q1024",	   0x20ba21, 0x0,       64 * 1024,  2048,      E_FSR | SECT_4K},
-	{"N25Q1024A",	   0x20bb21, 0x0,       64 * 1024,  2048,      E_FSR | SECT_4K},
+	{"M25P10",	   0x202011, 0x0,       32 * 1024,     4,	0,                0},
+	{"M25P20",	   0x202012, 0x0,       64 * 1024,     4,	0,                0},
+	{"M25P40",	   0x202013, 0x0,       64 * 1024,     8,	0,                0},
+	{"M25P80",	   0x202014, 0x0,       64 * 1024,    16,	0,                0},
+	{"M25P16",	   0x202015, 0x0,       64 * 1024,    32,	0,                0},
+	{"M25P32",	   0x202016, 0x0,       64 * 1024,    64,	0,                0},
+	{"M25P64",	   0x202017, 0x0,       64 * 1024,   128,	0,                0},
+	{"M25P128",	   0x202018, 0x0,      256 * 1024,    64,	0,                0},
+	{"N25Q32",	   0x20ba16, 0x0,       64 * 1024,    64,	0,          SECT_4K},
+	{"N25Q32A",	   0x20bb16, 0x0,       64 * 1024,    64,	0,          SECT_4K},
+	{"N25Q64",	   0x20ba17, 0x0,       64 * 1024,   128,	0,          SECT_4K},
+	{"N25Q64A",	   0x20bb17, 0x0,       64 * 1024,   128,	0,          SECT_4K},
+	{"N25Q128",	   0x20ba18, 0x0,       64 * 1024,   256,	0,          SECT_4K},
+	{"N25Q128A",	   0x20bb18, 0x0,       64 * 1024,   256,	0,          SECT_4K},
+	{"N25Q256",	   0x20ba19, 0x0,       64 * 1024,   512,	0,          SECT_4K},
+	{"N25Q256A",	   0x20bb19, 0x0,       64 * 1024,   512,	0,          SECT_4K},
+	{"N25Q512",	   0x20ba20, 0x0,       64 * 1024,  1024,       0,  E_FSR | SECT_4K},
+	{"N25Q512A",	   0x20bb20, 0x0,       64 * 1024,  1024,       0,  E_FSR | SECT_4K},
+	{"N25Q1024",	   0x20ba21, 0x0,       64 * 1024,  2048,       0,  E_FSR | SECT_4K},
+	{"N25Q1024A",	   0x20bb21, 0x0,       64 * 1024,  2048,       0,  E_FSR | SECT_4K},
 #endif
 #ifdef CONFIG_SPI_FLASH_SST		/* SST */
-	{"SST25VF040B",	   0xbf258d, 0x0,	64 * 1024,     8,     SECT_4K | SST_WP},
-	{"SST25VF080B",	   0xbf258e, 0x0,	64 * 1024,    16,     SECT_4K | SST_WP},
-	{"SST25VF016B",	   0xbf2541, 0x0,	64 * 1024,    32,     SECT_4K | SST_WP},
-	{"SST25VF032B",	   0xbf254a, 0x0,	64 * 1024,    64,     SECT_4K | SST_WP},
-	{"SST25VF064C",	   0xbf254b, 0x0,	64 * 1024,   128,	       SECT_4K},
-	{"SST25WF512",	   0xbf2501, 0x0,	64 * 1024,     1,     SECT_4K | SST_WP},
-	{"SST25WF010",	   0xbf2502, 0x0,	64 * 1024,     2,     SECT_4K | SST_WP},
-	{"SST25WF020",	   0xbf2503, 0x0,	64 * 1024,     4,     SECT_4K | SST_WP},
-	{"SST25WF040",	   0xbf2504, 0x0,	64 * 1024,     8,     SECT_4K | SST_WP},
-	{"SST25WF080",	   0xbf2505, 0x0,	64 * 1024,    16,     SECT_4K | SST_WP},
+	{"SST25VF040B",	   0xbf258d, 0x0,	64 * 1024,     8,       0, SECT_4K | SST_WP},
+	{"SST25VF080B",	   0xbf258e, 0x0,	64 * 1024,    16,	0, SECT_4K | SST_WP},
+	{"SST25VF016B",	   0xbf2541, 0x0,	64 * 1024,    32,	0, SECT_4K | SST_WP},
+	{"SST25VF032B",	   0xbf254a, 0x0,	64 * 1024,    64,	0, SECT_4K | SST_WP},
+	{"SST25VF064C",	   0xbf254b, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"SST25WF512",	   0xbf2501, 0x0,	64 * 1024,     1,       0, SECT_4K | SST_WP},
+	{"SST25WF010",	   0xbf2502, 0x0,	64 * 1024,     2,       0, SECT_4K | SST_WP},
+	{"SST25WF020",	   0xbf2503, 0x0,	64 * 1024,     4,       0, SECT_4K | SST_WP},
+	{"SST25WF040",	   0xbf2504, 0x0,	64 * 1024,     8,       0, SECT_4K | SST_WP},
+	{"SST25WF080",	   0xbf2505, 0x0,	64 * 1024,    16,       0, SECT_4K | SST_WP},
 #endif
 #ifdef CONFIG_SPI_FLASH_WINBOND		/* WINBOND */
-	{"W25P80",	   0xef2014, 0x0,	64 * 1024,    16,		    0},
-	{"W25P16",	   0xef2015, 0x0,	64 * 1024,    32,		    0},
-	{"W25P32",	   0xef2016, 0x0,	64 * 1024,    64,		    0},
-	{"W25X40",	   0xef3013, 0x0,	64 * 1024,     8,	      SECT_4K},
-	{"W25X16",	   0xef3015, 0x0,	64 * 1024,    32,	      SECT_4K},
-	{"W25X32",	   0xef3016, 0x0,	64 * 1024,    64,	      SECT_4K},
-	{"W25X64",	   0xef3017, 0x0,	64 * 1024,   128,	      SECT_4K},
-	{"W25Q80BL",	   0xef4014, 0x0,	64 * 1024,    16,	      SECT_4K},
-	{"W25Q16CL",	   0xef4015, 0x0,	64 * 1024,    32,	      SECT_4K},
-	{"W25Q32BV",	   0xef4016, 0x0,	64 * 1024,    64,	      SECT_4K},
-	{"W25Q64CV",	   0xef4017, 0x0,	64 * 1024,   128,	      SECT_4K},
-	{"W25Q128BV",	   0xef4018, 0x0,	64 * 1024,   256,	      SECT_4K},
-	{"W25Q256",	   0xef4019, 0x0,	64 * 1024,   512,	      SECT_4K},
-	{"W25Q80BW",	   0xef5014, 0x0,	64 * 1024,    16,	      SECT_4K},
-	{"W25Q16DW",	   0xef6015, 0x0,	64 * 1024,    32,	      SECT_4K},
-	{"W25Q32DW",	   0xef6016, 0x0,	64 * 1024,    64,	      SECT_4K},
-	{"W25Q64DW",	   0xef6017, 0x0,	64 * 1024,   128,	      SECT_4K},
-	{"W25Q128FW",	   0xef6018, 0x0,	64 * 1024,   256,	      SECT_4K},
+	{"W25P80",	   0xef2014, 0x0,	64 * 1024,    16,	0,		  0},
+	{"W25P16",	   0xef2015, 0x0,	64 * 1024,    32,	0,		  0},
+	{"W25P32",	   0xef2016, 0x0,	64 * 1024,    64,	0,		  0},
+	{"W25X40",	   0xef3013, 0x0,	64 * 1024,     8,	0,	    SECT_4K},
+	{"W25X16",	   0xef3015, 0x0,	64 * 1024,    32,	0,          SECT_4K},
+	{"W25X32",	   0xef3016, 0x0,	64 * 1024,    64,	0,          SECT_4K},
+	{"W25X64",	   0xef3017, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"W25Q80BL",	   0xef4014, 0x0,	64 * 1024,    16,	0,          SECT_4K},
+	{"W25Q16CL",	   0xef4015, 0x0,	64 * 1024,    32,	0,          SECT_4K},
+	{"W25Q32BV",	   0xef4016, 0x0,	64 * 1024,    64,	0,          SECT_4K},
+	{"W25Q64CV",	   0xef4017, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"W25Q128BV",	   0xef4018, 0x0,	64 * 1024,   256,	0,          SECT_4K},
+	{"W25Q256",	   0xef4019, 0x0,	64 * 1024,   512,	0,          SECT_4K},
+	{"W25Q80BW",	   0xef5014, 0x0,	64 * 1024,    16,	0,          SECT_4K},
+	{"W25Q16DW",	   0xef6015, 0x0,	64 * 1024,    32,	0,          SECT_4K},
+	{"W25Q32DW",	   0xef6016, 0x0,	64 * 1024,    64,	0,          SECT_4K},
+	{"W25Q64DW",	   0xef6017, 0x0,	64 * 1024,   128,	0,          SECT_4K},
+	{"W25Q128FW",	   0xef6018, 0x0,	64 * 1024,   256,	0,          SECT_4K},
 #endif
 	/*
 	 * Note:
@@ -155,12 +157,20 @@ static const struct spi_flash_params spi_flash_params_table[] = {
 	 */
 };
 
+/* Read commands array */
+static u8 spi_read_cmds_array[] = {
+	CMD_READ_ARRAY_SLOW,
+	CMD_READ_DUAL_OUTPUT_FAST,
+	CMD_READ_DUAL_IO_FAST,
+};
+
 static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
 		u8 *idcode)
 {
 	const struct spi_flash_params *params;
 	struct spi_flash *flash;
 	int i;
+	u8 cmd;
 	u16 jedec = idcode[1] << 8 | idcode[2];
 	u16 ext_jedec = idcode[3] << 8 | idcode[4];
 
@@ -222,6 +232,16 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
 		flash->erase_size = flash->sector_size;
 	}
 
+	/* Look for the fastest read cmd */
+	cmd = fls(params->e_rd_cmd & flash->spi->op_mode_rx);
+	if (cmd) {
+		cmd = spi_read_cmds_array[cmd - 1];
+		flash->read_cmd = cmd;
+	} else {
+		/* Go for for default supported read cmd */
+		flash->read_cmd = CMD_READ_ARRAY_FAST;
+	}
+
 	/* Poll cmd seclection */
 	flash->poll_cmd = CMD_READ_STATUS;
 #ifdef CONFIG_SPI_FLASH_STMICRO
diff --git a/include/spi.h b/include/spi.h
index aba7922..31195a3 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -31,6 +31,12 @@
 #define SPI_XFER_MMAP_END	0x10	/* Memory Mapped End */
 #define SPI_XFER_ONCE		(SPI_XFER_BEGIN | SPI_XFER_END)
 
+/* SPI RX operation modes */
+#define SPI_OPM_RX_AS		1 << 0
+#define SPI_OPM_RX_DOUT		1 << 1
+#define SPI_OPM_RX_DIO		1 << 2
+#define SPI_OPM_RX_EXTN		SPI_OPM_RX_AS | SPI_OPM_RX_DOUT | SPI_OPM_RX_DIO
+
 /* Header byte that marks the start of the message */
 #define SPI_PREAMBLE_END_BYTE	0xec
 
@@ -43,6 +49,7 @@
  *
  * @bus:		ID of the bus that the slave is attached to.
  * @cs:			ID of the chip select connected to the slave.
+ * @op_mode_rx:		SPI RX operation mode.
  * @wordlen:		Size of SPI word in number of bits
  * @max_write_size:	If non-zero, the maximum number of bytes which can
  *			be written at once, excluding command bytes.
@@ -51,6 +58,7 @@
 struct spi_slave {
 	unsigned int bus;
 	unsigned int cs;
+	u8 op_mode_rx;
 	unsigned int wordlen;
 	unsigned int max_write_size;
 	void *memory_map;
diff --git a/include/spi_flash.h b/include/spi_flash.h
index afc3a58..692e143 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -19,6 +19,14 @@
 #include <linux/types.h>
 #include <linux/compiler.h>
 
+/* Enum list - Extended read commands */
+enum spi_read_cmds {
+	ARRAY_SLOW = 1 << 0,
+	DUAL_OUTPUT_FAST = 1 << 1,
+	DUAL_IO_FAST = 1 << 2,
+};
+#define RD_EXTN		ARRAY_SLOW | DUAL_OUTPUT_FAST | DUAL_IO_FAST
+
 /**
  * struct spi_flash - SPI flash structure
  *
@@ -33,6 +41,7 @@
  * @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 and Extn read
  * @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
@@ -57,6 +66,7 @@ struct spi_flash {
 #endif
 	u8 poll_cmd;
 	u8 erase_cmd;
+	u8 read_cmd;
 
 	void *memory_map;
 	int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);