sf: ops: Add spi_flash_copy_mmap function

When doing a memory mapped copy we may have DMA available and thus need
to have this copy abstracted so that the driver can do it, rather than a
simple memcpy.

Signed-off-by: Tom Rini <trini@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>

drivers/mtd/spi/sf_ops.c

@@ -14,6 +14,7 @@
 #include <spi.h>
 #include <spi_flash.h>
 #include <watchdog.h>
+#include <linux/compiler.h>
 
 #include "sf_internal.h"
 
@@ -378,6 +379,11 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
+void __weak spi_flash_copy_mmap(void *data, void *offset, size_t len)
+{
+	memcpy(data, offset, len);
+}
+
 int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 		size_t len, void *data)
 {
@@ -394,7 +400,7 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 			return ret;
 		}
 		spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP);
-		memcpy(data, flash->memory_map + offset, len);
+		spi_flash_copy_mmap(data, flash->memory_map + offset, len);
 		spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP_END);
 		spi_release_bus(flash->spi);
 		return 0;

include/spi.h

@@ -272,6 +272,9 @@ int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
 int  spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 		void *din, unsigned long flags);
 
+/* Copy memory mapped data */
+void spi_flash_copy_mmap(void *data, void *offset, size_t len);
+
 /**
  * Determine if a SPI chipselect is valid.
  * This function is provided by the board if the low-level SPI driver