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