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>
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index c009af5..2396e22 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -269,7 +269,9 @@
/* 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 1525636..6aa7086 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -203,6 +203,7 @@
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..c2086fc 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 @@
unsigned int bus;
unsigned int cs;
unsigned int max_write_size;
+ void *memory_map;
};
/**