diff options
| author | Poddar, Sourav <sourav.poddar@ti.com> | 2013-10-07 15:53:01 +0530 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2013-10-07 17:55:51 +0530 |
| commit | 004f15b6000e220b74433b190e60805ce8776d92 (patch) | |
| tree | 33fdceed2d361fffdc0d9f8f7f0282b425c0d978 | |
| parent | 62d206dc3126914f187cfb72e8a7c6cf84c19b7c (diff) | |
sf: Add memory mapped read support
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>
| -rw-r--r-- | drivers/mtd/spi/sf_ops.c | 2 | ||||
| -rw-r--r-- | drivers/mtd/spi/sf_probe.c | 1 | ||||
| -rw-r--r-- | include/spi.h | 3 |
3 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c index c009af5c20..2396e2272f 100644 --- a/drivers/mtd/spi/sf_ops.c +++ b/drivers/mtd/spi/sf_ops.c @@ -269,7 +269,9 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset, /* Handle memory-mapped SPI */ if (flash->memory_map) { + spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP); memcpy(data, flash->memory_map + offset, len); + spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP_END); return 0; } diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 15256369e0..6aa7086c41 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -203,6 +203,7 @@ struct spi_flash *spi_flash_validate_params(struct spi_slave *spi, u8 *idcode) flash->page_size = (ext_jedec == 0x4d00) ? 512 : 256; flash->sector_size = params->sector_size; flash->size = flash->sector_size * params->nr_sectors; + flash->memory_map = spi->memory_map; /* Compute erase sector and command */ if (params->flags & SECT_4K) { diff --git a/include/spi.h b/include/spi.h index c44ebe8874..c2086fc62e 100644 --- a/include/spi.h +++ b/include/spi.h @@ -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; }; /** |