[MTD] Add initial support for OneNAND flash chips

OneNAND is a new flash technology from Samsung with integrated SRAM
buffers and logic interface.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 134 insertions, 0 deletions

diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
new file mode 100644
index 000000000000..b9a64117d646
--- /dev/null
+++ b/include/linux/mtd/onenand.h
@@ -0,0 +1,134 @@
+/*
+ *  linux/include/linux/mtd/onenand.h
+ *
+ *  Copyright (C) 2005 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_MTD_ONENAND_H
+#define __LINUX_MTD_ONENAND_H
+
+#include <linux/spinlock.h>
+#include <linux/mtd/onenand_regs.h>
+
+#define MAX_BUFFERRAM		2
+
+/* Scan and identify a OneNAND device */
+extern int onenand_scan(struct mtd_info *mtd, int max_chips);
+/* Free resources held by the OneNAND device */
+extern void onenand_release(struct mtd_info *mtd);
+
+/**
+ * onenand_state_t - chip states
+ * Enumeration for OneNAND flash chip state
+ */
+typedef enum {
+	FL_READY,
+	FL_READING,
+	FL_WRITING,
+	FL_ERASING,
+	FL_SYNCING,
+	FL_UNLOCKING,
+	FL_LOCKING,
+} onenand_state_t;
+
+/**
+ * struct onenand_bufferram - OneNAND BufferRAM Data
+ * @param block		block address in BufferRAM
+ * @param page		page address in BufferRAM
+ * @param valid		valid flag
+ */
+struct onenand_bufferram {
+	int block;
+	int page;
+	int valid;
+};
+
+/**
+ * struct onenand_chip - OneNAND Private Flash Chip Data
+ * @param base		[BOARDSPECIFIC] address to access OneNAND
+ * @param chipsize	[INTERN] the size of one chip for multichip arrays
+ * @param device_id	[INTERN] device ID
+ * @param verstion_id	[INTERN] version ID
+ * @param options	[BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about
+ * @param erase_shift	[INTERN] number of address bits in a block
+ * @param page_shift	[INTERN] number of address bits in a page
+ * @param ppb_shift	[INTERN] number of address bits in a pages per block
+ * @param page_mask	[INTERN] a page per block mask
+ * @param bufferam_index	[INTERN] BufferRAM index
+ * @param bufferam	[INTERN] BufferRAM info
+ * @param readw		[REPLACEABLE] hardware specific function for read short
+ * @param writew	[REPLACEABLE] hardware specific function for write short
+ * @param command	[REPLACEABLE] hardware specific function for writing commands to the chip
+ * @param wait		[REPLACEABLE] hardware specific function for wait on ready
+ * @param read_bufferram	[REPLACEABLE] hardware specific function for BufferRAM Area
+ * @param write_bufferram	[REPLACEABLE] hardware specific function for BufferRAM Area
+ * @param chip_lock	[INTERN] spinlock used to protect access to this structure and the chip
+ * @param wq		[INTERN] wait queue to sleep on if a OneNAND operation is in progress
+ * @param state		[INTERN] the current state of the OneNAND device
+ * @param autooob	[REPLACEABLE] the default (auto)placement scheme
+ * @param priv		[OPTIONAL] pointer to private chip date
+ */
+struct onenand_chip {
+	void __iomem		*base;
+	unsigned int		chipsize;
+	unsigned int		device_id;
+	unsigned int		options;
+
+	unsigned int		erase_shift;
+	unsigned int		page_shift;
+	unsigned int		ppb_shift;	/* Pages per block shift */
+	unsigned int		page_mask;
+
+	unsigned int		bufferram_index;
+	struct onenand_bufferram	bufferram[MAX_BUFFERRAM];
+
+	int (*command)(struct mtd_info *mtd, int cmd, loff_t address, size_t len);
+	int (*wait)(struct mtd_info *mtd, int state);
+	int (*read_bufferram)(struct mtd_info *mtd, int area,
+			unsigned char *buffer, int offset, size_t count);
+	int (*write_bufferram)(struct mtd_info *mtd, int area,
+			const unsigned char *buffer, int offset, size_t count);
+	unsigned short (*read_word)(void __iomem *addr);
+	void (*write_word)(unsigned short value, void __iomem *addr);
+
+	spinlock_t		chip_lock;
+	wait_queue_head_t	wq;
+	onenand_state_t		state;
+
+	struct nand_oobinfo	*autooob;
+
+	void			*priv;
+};
+
+#define ONENAND_CURRENT_BUFFERRAM(this)		(this->bufferram_index)
+#define ONENAND_NEXT_BUFFERRAM(this)		(this->bufferram_index ^ 1)
+#define ONENAND_SET_NEXT_BUFFERRAM(this)	(this->bufferram_index ^= 1)
+
+/*
+ * Options bits
+ */
+#define ONENAND_CONT_LOCK		(0x0001)
+
+
+/*
+ * OneNAND Flash Manufacturer ID Codes
+ */
+#define ONENAND_MFR_SAMSUNG	0xec
+#define ONENAND_MFR_UNKNOWN	0x00
+
+/**
+ * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
+ * @param name:		Manufacturer name
+ * @param id:		manufacturer ID code of device.
+*/
+struct onenand_manufacturers {
+        int id;
+        char *name;
+};
+
+#endif	/* __LINUX_MTD_ONENAND_H */