SPI Flash subsystem

This adds a new SPI flash subsystem.

Currently, only AT45 DataFlash in non-power-of-two mode is supported,
but some preliminary support for other flash types is in place as
well.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/include/spi_flash.h b/include/spi_flash.h
new file mode 100644
index 0000000..de4f174
--- /dev/null
+++ b/include/spi_flash.h
@@ -0,0 +1,70 @@
+/*
+ * Interface to SPI flash
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#ifndef _SPI_FLASH_H_
+#define _SPI_FLASH_H_
+
+#include <spi.h>
+
+struct spi_flash_region {
+	unsigned int	count;
+	unsigned int	size;
+};
+
+struct spi_flash {
+	struct spi_slave *spi;
+
+	const char	*name;
+
+	u32		size;
+
+	int		(*read)(struct spi_flash *flash, u32 offset,
+				size_t len, void *buf);
+	int		(*write)(struct spi_flash *flash, u32 offset,
+				size_t len, const void *buf);
+	int		(*erase)(struct spi_flash *flash, u32 offset,
+				size_t len);
+};
+
+struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int spi_mode);
+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)
+{
+	return flash->read(flash, offset, len, buf);
+}
+
+static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
+		size_t len, const void *buf)
+{
+	return flash->write(flash, offset, len, buf);
+}
+
+static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
+		size_t len)
+{
+	return flash->erase(flash, offset, len);
+}
+
+#endif /* _SPI_FLASH_H_ */