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>

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>
Poddar, Sourav · Jagannadha Sutradharudu Teki
1 parent 62d206dc31
Showing 3 changed files with 6 additions and 0 deletions Side-by-side Diff
drivers/mtd/spi/sf_ops.c
drivers/mtd/spi/sf_probe.c
include/spi.h
@@ -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;
 	}
  
@@ -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) {
@@ -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;
 };
  
 /**
...	...	@@ -269,7 +269,9 @@
269	269
270	270	/* Handle memory-mapped SPI */
271	271	if (flash->memory_map) {
	272	+ spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP);
272	273	memcpy(data, flash->memory_map + offset, len);
	274	+ spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP_END);
273	275	return 0;
274	276	}
275	277
...	...	@@ -203,6 +203,7 @@
203	203	flash->page_size = (ext_jedec == 0x4d00) ? 512 : 256;
204	204	flash->sector_size = params->sector_size;
205	205	flash->size = flash->sector_size * params->nr_sectors;
	206	+ flash->memory_map = spi->memory_map;
206	207
207	208	/* Compute erase sector and command */
208	209	if (params->flags & SECT_4K) {
...	...	@@ -27,6 +27,8 @@
27	27	/* SPI transfer flags */
28	28	#define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */
29	29	#define SPI_XFER_END 0x02 /* Deassert CS after transfer */
	30	+#define SPI_XFER_MMAP 0x08 /* Memory Mapped start */
	31	+#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */
30	32
31	33	/* Header byte that marks the start of the message */
32	34	#define SPI_PREAMBLE_END_BYTE 0xec
...	...	@@ -46,6 +48,7 @@
46	48	unsigned int bus;
47	49	unsigned int cs;
48	50	unsigned int max_write_size;
	51	+ void *memory_map;
49	52	};
50	53
51	54	/**