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sf: Add memory mapped read support

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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.poddar@ti.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
This commit is contained in:
Poddar, Sourav
2013-10-07 15:53:01 +05:30
committed by Jagannadha Sutradharudu Teki
parent 62d206dc31
commit 004f15b600
3 changed files with 6 additions and 0 deletions
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3
include/spi.h
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@ -27,6 +27,8 @@
/* SPI transfer flags */
#define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */
#define SPI_XFER_END 0x02 /* Deassert CS after transfer */
#define SPI_XFER_MMAP 0x08 /* Memory Mapped start */
#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */
/* Header byte that marks the start of the message */
#define SPI_PREAMBLE_END_BYTE 0xec
@ -46,6 +48,7 @@ struct spi_slave {
unsigned int bus;
unsigned int cs;
unsigned int max_write_size;
void *memory_map;
};
/**