Qspi controller can have a memory mapped port which can be used for
data read. Added support to enable memory mapped port read.

This patch enables the following:
- It enables exchange of memory map address between mtd and qspi
through the introduction of "memory_map" flag.
- Add support to communicate to the driver that memory mapped
 transfer is to be started through introduction of new flags like
"SPI_XFER_MEM_MAP" and "SPI_XFER_MEM_MAP_END".

This will enable the spi controller to do memory mapped configurations
if required.

Signed-off-by: Sourav Poddar <sourav.pod...@ti.com>
---
 drivers/mtd/spi/spansion.c  |    1 +
 drivers/mtd/spi/spi_flash.c |    4 ++++
 include/spi.h               |    3 +++
 3 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/spi/spansion.c b/drivers/mtd/spi/spansion.c
index fa7ac8c..9d801a3 100644
--- a/drivers/mtd/spi/spansion.c
+++ b/drivers/mtd/spi/spansion.c
@@ -136,6 +136,7 @@ struct spi_flash *spi_flash_probe_spansion(struct spi_slave 
*spi, u8 *idcode)
        flash->page_size = 256;
        flash->sector_size = 256 * params->pages_per_sector;
        flash->size = flash->sector_size * params->nr_sectors;
+       flash->memory_map = spi->memory_map;
 
        return flash;
 }
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 993a9d4..5ad2dc1 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -287,7 +287,9 @@ int spi_flash_cmd_read_quad(struct spi_flash *flash, u32 
offset,
 
        /* Handle memory-mapped SPI */
        if (flash->memory_map) {
+               spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MEM_MAP);
                memcpy(data, flash->memory_map + offset, len);
+               spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MEM_MAP_END);
                return 0;
        }
 
@@ -338,7 +340,9 @@ int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 
offset,
 
        /* Handle memory-mapped SPI */
        if (flash->memory_map) {
+               spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MEM_MAP);
                memcpy(data, flash->memory_map + offset, len);
+               spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MEM_MAP_END);
                return 0;
        }
 
diff --git a/include/spi.h b/include/spi.h
index 9d4b2dc..559722f 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -28,6 +28,8 @@
 #define SPI_XFER_BEGIN 0x01                    /* Assert CS before transfer */
 #define SPI_XFER_END   0x02                    /* Deassert CS after transfer */
 #define SPI_QUAD       0x04                    /* Use QUAD read command */
+#define SPI_XFER_MEM_MAP 0x08                  /* Memory Mapped start */
+#define SPI_XFER_MEM_MAP_END 0x10              /* Memory Mapped End */
 
 /* Header byte that marks the start of the message */
 #define SPI_PREAMBLE_END_BYTE  0xec
@@ -47,6 +49,7 @@ struct spi_slave {
        unsigned int    cs;
        unsigned int max_write_size;
        bool quad_enable;
+       void *memory_map;
 };
 
 /*-----------------------------------------------------------------------
-- 
1.7.1

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