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>

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index d291746..938a78e 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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);