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 --- drivers/mtd/spi/sf_ops.c | 2 ++ drivers/mtd/spi/sf_probe.c | 1 + 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 c009af5..bee4128 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_MEM_MAP); memcpy(data, flash->memory_map + offset, len); + spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MEM_MAP); return 0; }
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 1525636..6aa7086 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 c44ebe8..d5c4e08 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_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 @@ -46,6 +48,7 @@ struct spi_slave { unsigned int bus; unsigned int cs; unsigned int max_write_size; + void *memory_map; };
/**