X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=include%2Fspi_flash.h;h=10d19fd4b1178d2a5c1f8e0b8deb73368125da5e;hb=6786ce1ce14feb4d02854a0c04bc0cce505be46e;hp=d9b2af856c08feb18adda8934452483800f83bb4;hpb=1b6ae82a5abb4cbedb0d6cb262526173f4efa486;p=platform%2Fkernel%2Fu-boot.git

diff --git a/include/spi_flash.h b/include/spi_flash.h
index d9b2af8..10d19fd 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -9,23 +9,10 @@
 #ifndef _SPI_FLASH_H_
 #define _SPI_FLASH_H_
 
-#include <dm.h>	/* Because we dereference struct udevice here */
 #include <linux/types.h>
 #include <linux/mtd/spi-nor.h>
 
-/* by default ENV use the same parameters than SF command */
-#ifndef CONFIG_ENV_SPI_BUS
-# define CONFIG_ENV_SPI_BUS	CONFIG_SF_DEFAULT_BUS
-#endif
-#ifndef CONFIG_ENV_SPI_CS
-# define CONFIG_ENV_SPI_CS	CONFIG_SF_DEFAULT_CS
-#endif
-#ifndef CONFIG_ENV_SPI_MAX_HZ
-# define CONFIG_ENV_SPI_MAX_HZ	CONFIG_SF_DEFAULT_SPEED
-#endif
-#ifndef CONFIG_ENV_SPI_MODE
-# define CONFIG_ENV_SPI_MODE	CONFIG_SF_DEFAULT_MODE
-#endif
+struct udevice;
 
 struct spi_slave;
 
@@ -34,12 +21,25 @@ struct dm_spi_flash_ops {
 	int (*write)(struct udevice *dev, u32 offset, size_t len,
 		     const void *buf);
 	int (*erase)(struct udevice *dev, u32 offset, size_t len);
+	/**
+	 * get_sw_write_prot() - Check state of software write-protect feature
+	 *
+	 * SPI flash chips can lock a region of the flash defined by a
+	 * 'protected area'. This function checks if this protected area is
+	 * defined.
+	 *
+	 * @dev:	SPI flash device
+	 * @return 0 if no region is write-protected, 1 if a region is
+	 *	write-protected, -ENOSYS if the driver does not implement this,
+	 *	other -ve value on error
+	 */
+	int (*get_sw_write_prot)(struct udevice *dev);
 };
 
 /* Access the serial operations for a device */
 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 
-#ifdef CONFIG_DM_SPI_FLASH
+#if CONFIG_IS_ENABLED(DM_SPI_FLASH)
 /**
  * spi_flash_read_dm() - Read data from SPI flash
  *
@@ -47,7 +47,7 @@ struct dm_spi_flash_ops {
  * @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
+ * Return: 0 if OK, -ve on error
  */
 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
 
@@ -58,7 +58,7 @@ int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
  * @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
+ * Return: 0 if OK, -ve on error
  */
 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
 		       const void *buf);
@@ -71,11 +71,25 @@ int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
  * @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
+ * Return: 0 if OK, -ve on error
  */
 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
 
 /**
+ * spl_flash_get_sw_write_prot() - Check state of software write-protect feature
+ *
+ * SPI flash chips can lock a region of the flash defined by a
+ * 'protected area'. This function checks if this protected area is
+ * defined.
+ *
+ * @dev:	SPI flash device
+ * Return: 0 if no region is write-protected, 1 if a region is
+ *	write-protected, -ENOSYS if the driver does not implement this,
+ *	other -ve value on error
+ */
+int spl_flash_get_sw_write_prot(struct udevice *dev);
+
+/**
  * spi_flash_std_probe() - Probe a SPI flash device
  *
  * This is the standard internal method for probing a SPI flash device to
@@ -83,12 +97,11 @@ int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
  * do this, typically with of-platdata
  *
  * @dev: SPI-flash device to probe
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int spi_flash_std_probe(struct udevice *dev);
 
 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
-			   unsigned int max_hz, unsigned int spi_mode,
 			   struct udevice **devp);
 
 /* Compatibility function - this is the old U-Boot API */
@@ -96,7 +109,9 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 				  unsigned int max_hz, unsigned int spi_mode);
 
 /* Compatibility function - this is the old U-Boot API */
-void spi_flash_free(struct spi_flash *flash);
+static inline void spi_flash_free(struct spi_flash *flash)
+{
+}
 
 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 				 size_t len, void *buf)
@@ -135,6 +150,9 @@ static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 	struct mtd_info *mtd = &flash->mtd;
 	size_t retlen;
 
+	if (!len)
+		return 0;
+
 	return mtd->_read(mtd, offset, len, &retlen, buf);
 }
 
@@ -144,6 +162,9 @@ static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 	struct mtd_info *mtd = &flash->mtd;
 	size_t retlen;
 
+	if (!len)
+		return 0;
+
 	return mtd->_write(mtd, offset, len, &retlen, buf);
 }
 
@@ -158,6 +179,9 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 		return -EINVAL;
 	}
 
+	if (!len)
+		return 0;
+
 	memset(&instr, 0, sizeof(instr));
 	instr.addr = offset;
 	instr.len = len;