dm: sf: Add driver model read/write/erase methods

Permit use of a udevice to talk to SPI flash. Ultimately we would like
to retire the use of 'struct spi_flash' for this purpose, so create the
new API for those who want to move to it.
Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/mtd/spi/sf-uclass.c

@@ -11,6 +11,22 @@
 #include <dm/device-internal.h>
 #include "sf_internal.h"
 
+int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf)
+{
+	return sf_get_ops(dev)->read(dev, offset, len, buf);
+}
+
+int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
+		       const void *buf)
+{
+	return sf_get_ops(dev)->write(dev, offset, len, buf);
+}
+
+int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len)
+{
+	return sf_get_ops(dev)->erase(dev, offset, len);
+}
+
 /*
  * TODO(sjg@chromium.org): This is an old-style function. We should remove
  * it when all SPI flash drivers use dm

include/spi_flash.h

@@ -118,6 +118,41 @@ struct dm_spi_flash_ops {
 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 
 #ifdef CONFIG_DM_SPI_FLASH
+/**
+ * spi_flash_read_dm() - Read data from SPI flash
+ *
+ * @dev:	SPI flash device
+ * @offset:	Offset into device in bytes to read from
+ * @len:	Number of bytes to read
+ * @buf:	Buffer to put the data that is read
+ * @return 0 if OK, -ve on error
+ */
+int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
+
+/**
+ * spi_flash_write_dm() - Write data to SPI flash
+ *
+ * @dev:	SPI flash device
+ * @offset:	Offset into device in bytes to write to
+ * @len:	Number of bytes to write
+ * @buf:	Buffer containing bytes to write
+ * @return 0 if OK, -ve on error
+ */
+int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
+		       const void *buf);
+
+/**
+ * spi_flash_erase_dm() - Erase blocks of the SPI flash
+ *
+ * Note that @len must be a muiltiple of the flash sector size.
+ *
+ * @dev:	SPI flash device
+ * @offset:	Offset into device in bytes to start erasing
+ * @len:	Number of bytes to erase
+ * @return 0 if OK, -ve on error
+ */
+int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
+
 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 			   unsigned int max_hz, unsigned int spi_mode,
 			   struct udevice **devp);
@@ -132,21 +167,21 @@ void spi_flash_free(struct spi_flash *flash);
 int spi_flash_remove(struct udevice *flash);
 
 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
-		size_t len, void *buf)
+				 size_t len, void *buf)
 {
-	return sf_get_ops(flash->dev)->read(flash->dev, offset, len, buf);
+	return spi_flash_read_dm(flash->dev, offset, len, buf);
 }
 
 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
-		size_t len, const void *buf)
+				  size_t len, const void *buf)
 {
-	return sf_get_ops(flash->dev)->write(flash->dev, offset, len, buf);
+	return spi_flash_write_dm(flash->dev, offset, len, buf);
 }
 
 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
-		size_t len)
+				  size_t len)
 {
-	return sf_get_ops(flash->dev)->erase(flash->dev, offset, len);
+	return spi_flash_erase_dm(flash->dev, offset, len);
 }
 
 struct sandbox_state;