diff options
Diffstat (limited to 'include/linux/mtd/onenand.h')
| -rw-r--r-- | include/linux/mtd/onenand.h | 134 |
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 00000000000..b9a64117d64 --- /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 */ |