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/*
* 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);
void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
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 */
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