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u-boot/include/linux/mtd/mtd.h
Miquel Raynal 2a74930da5 mtd: mtdpart: implement proper partition handling 
Instead of collecting partitions in a flat list, create a hierarchy
within the mtd_info structure: use a partitions list to keep track of
the partitions of an MTD device (which might be itself a partition of
another MTD device), a pointer to the parent device (NULL when the MTD
device is the root one, not a partition).

By also saving directly in mtd_info the offset of the partition, we
can get rid of the mtd_part structure.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
2018-10-02 22:12:32 +05:30

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
*
*/
#ifndef __MTD_MTD_H__
#define __MTD_MTD_H__
#ifndef __UBOOT__
#include <linux/types.h>
#include <linux/uio.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <mtd/mtd-abi.h>
#include <asm/div64.h>
#else
#include <linux/compat.h>
#include <mtd/mtd-abi.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <div64.h>
#if IS_ENABLED(CONFIG_DM)
#include <dm/device.h>
#endif
#define MAX_MTD_DEVICES 32
#endif
#define MTD_ERASE_PENDING 0x01
#define MTD_ERASING 0x02
#define MTD_ERASE_SUSPEND 0x04
#define MTD_ERASE_DONE 0x08
#define MTD_ERASE_FAILED 0x10
#define MTD_FAIL_ADDR_UNKNOWN -1LL
/*
* If the erase fails, fail_addr might indicate exactly which block failed. If
* fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
* or was not specific to any particular block.
*/
struct erase_info {
struct mtd_info *mtd;
uint64_t addr;
uint64_t len;
uint64_t fail_addr;
u_long time;
u_long retries;
unsigned dev;
unsigned cell;
void (*callback) (struct erase_info *self);
u_long priv;
u_char state;
struct erase_info *next;
int scrub;
};
struct mtd_erase_region_info {
uint64_t offset; /* At which this region starts, from the beginning of the MTD */
uint32_t erasesize; /* For this region */
uint32_t numblocks; /* Number of blocks of erasesize in this region */
unsigned long *lockmap; /* If keeping bitmap of locks */
};
/**
* struct mtd_oob_ops - oob operation operands
* @mode: operation mode
*
* @len: number of data bytes to write/read
*
* @retlen: number of data bytes written/read
*
* @ooblen: number of oob bytes to write/read
* @oobretlen: number of oob bytes written/read
* @ooboffs: offset of oob data in the oob area (only relevant when
* mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
* @datbuf: data buffer - if NULL only oob data are read/written
* @oobbuf: oob data buffer
*/
struct mtd_oob_ops {
unsigned int mode;
size_t len;
size_t retlen;
size_t ooblen;
size_t oobretlen;
uint32_t ooboffs;
uint8_t *datbuf;
uint8_t *oobbuf;
};
#ifdef CONFIG_SYS_NAND_MAX_OOBFREE
#define MTD_MAX_OOBFREE_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_OOBFREE
#else
#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32
#endif
#ifdef CONFIG_SYS_NAND_MAX_ECCPOS
#define MTD_MAX_ECCPOS_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_ECCPOS
#else
#define MTD_MAX_ECCPOS_ENTRIES_LARGE 680
#endif
/**
* struct mtd_oob_region - oob region definition
* @offset: region offset
* @length: region length
*
* This structure describes a region of the OOB area, and is used
* to retrieve ECC or free bytes sections.
* Each section is defined by an offset within the OOB area and a
* length.
*/
struct mtd_oob_region {
u32 offset;
u32 length;
};
/*
* struct mtd_ooblayout_ops - NAND OOB layout operations
* @ecc: function returning an ECC region in the OOB area.
* Should return -ERANGE if %section exceeds the total number of
* ECC sections.
* @free: function returning a free region in the OOB area.
* Should return -ERANGE if %section exceeds the total number of
* free sections.
*/
struct mtd_ooblayout_ops {
int (*ecc)(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobecc);
int (*free)(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobfree);
};
/*
* Internal ECC layout control structure. For historical reasons, there is a
* similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
* for export to user-space via the ECCGETLAYOUT ioctl.
* nand_ecclayout should be expandable in the future simply by the above macros.
*/
struct nand_ecclayout {
__u32 eccbytes;
__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
__u32 oobavail;
struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
};
struct module; /* only needed for owner field in mtd_info */
struct mtd_info {
u_char type;
uint32_t flags;
uint64_t size; // Total size of the MTD
/* "Major" erase size for the device. Naïve users may take this
* to be the only erase size available, or may use the more detailed
* information below if they desire
*/
uint32_t erasesize;
/* Minimal writable flash unit size. In case of NOR flash it is 1 (even
* though individual bits can be cleared), in case of NAND flash it is
* one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
* it is of ECC block size, etc. It is illegal to have writesize = 0.
* Any driver registering a struct mtd_info must ensure a writesize of
* 1 or larger.
*/
uint32_t writesize;
/*
* Size of the write buffer used by the MTD. MTD devices having a write
* buffer can write multiple writesize chunks at a time. E.g. while
* writing 4 * writesize bytes to a device with 2 * writesize bytes
* buffer the MTD driver can (but doesn't have to) do 2 writesize
* operations, but not 4. Currently, all NANDs have writebufsize
* equivalent to writesize (NAND page size). Some NOR flashes do have
* writebufsize greater than writesize.
*/
uint32_t writebufsize;
uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
uint32_t oobavail; // Available OOB bytes per block
/*
* If erasesize is a power of 2 then the shift is stored in
* erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
*/
unsigned int erasesize_shift;
unsigned int writesize_shift;
/* Masks based on erasesize_shift and writesize_shift */
unsigned int erasesize_mask;
unsigned int writesize_mask;
/*
* read ops return -EUCLEAN if max number of bitflips corrected on any
* one region comprising an ecc step equals or exceeds this value.
* Settable by driver, else defaults to ecc_strength. User can override
* in sysfs. N.B. The meaning of the -EUCLEAN return code has changed;
* see Documentation/ABI/testing/sysfs-class-mtd for more detail.
*/
unsigned int bitflip_threshold;
// Kernel-only stuff starts here.
#ifndef __UBOOT__
const char *name;
#else
char *name;
#endif
int index;
/* OOB layout description */
const struct mtd_ooblayout_ops *ooblayout;
/* ECC layout structure pointer - read only! */
struct nand_ecclayout *ecclayout;
/* the ecc step size. */
unsigned int ecc_step_size;
/* max number of correctible bit errors per ecc step */
unsigned int ecc_strength;
/* Data for variable erase regions. If numeraseregions is zero,
* it means that the whole device has erasesize as given above.
*/
int numeraseregions;
struct mtd_erase_region_info *eraseregions;
/*
* Do not call via these pointers, use corresponding mtd_*()
* wrappers instead.
*/
int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
#ifndef __UBOOT__
int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys);
int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
#endif
unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
unsigned long len,
unsigned long offset,
unsigned long flags);
int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf);
int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf);
int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf);
int (*_read_oob) (struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops);
int (*_write_oob) (struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops);
int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf);
int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf);
int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf);
int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf);
int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
size_t len, size_t *retlen, u_char *buf);
int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
size_t len);
#ifndef __UBOOT__
int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen);
#endif
void (*_sync) (struct mtd_info *mtd);
int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
#ifndef __UBOOT__
int (*_suspend) (struct mtd_info *mtd);
void (*_resume) (struct mtd_info *mtd);
void (*_reboot) (struct mtd_info *mtd);
#endif
/*
* If the driver is something smart, like UBI, it may need to maintain
* its own reference counting. The below functions are only for driver.
*/
int (*_get_device) (struct mtd_info *mtd);
void (*_put_device) (struct mtd_info *mtd);
#ifndef __UBOOT__
/* Backing device capabilities for this device
* - provides mmap capabilities
*/
struct backing_dev_info *backing_dev_info;
struct notifier_block reboot_notifier; /* default mode before reboot */
#endif
/* ECC status information */
struct mtd_ecc_stats ecc_stats;
/* Subpage shift (NAND) */
int subpage_sft;
void *priv;
struct module *owner;
#ifndef __UBOOT__
struct device dev;
#else
struct udevice *dev;
#endif
int usecount;
/* MTD devices do not have any parent. MTD partitions do. */
struct mtd_info *parent;
/*
* Offset of the partition relatively to the parent offset.
* Is 0 for real MTD devices (ie. not partitions).
*/
u64 offset;
/*
* List node used to add an MTD partition to the parent
* partition list.
*/
struct list_head node;
/*
* List of partitions attached to this MTD device (the parent
* MTD device can itself be a partition).
*/
struct list_head partitions;
};
#if IS_ENABLED(CONFIG_DM)
static inline void mtd_set_of_node(struct mtd_info *mtd,
const struct device_node *np)
{
mtd->dev->node.np = np;
}
static inline const struct device_node *mtd_get_of_node(struct mtd_info *mtd)
{
return mtd->dev->node.np;
}
#else
struct device_node;
static inline void mtd_set_of_node(struct mtd_info *mtd,
const struct device_node *np)
{
}
static inline const struct device_node *mtd_get_of_node(struct mtd_info *mtd)
{
return NULL;
}
#endif
static inline bool mtd_is_partition(const struct mtd_info *mtd)
{
return mtd->parent;
}
static inline bool mtd_has_partitions(const struct mtd_info *mtd)
{
return !list_empty(&mtd->partitions);
}
int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobecc);
int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
int *section,
struct mtd_oob_region *oobregion);
int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
const u8 *oobbuf, int start, int nbytes);
int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
u8 *oobbuf, int start, int nbytes);
int mtd_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobfree);
int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
const u8 *oobbuf, int start, int nbytes);
int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
u8 *oobbuf, int start, int nbytes);
int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
static inline void mtd_set_ooblayout(struct mtd_info *mtd,
const struct mtd_ooblayout_ops *ooblayout)
{
mtd->ooblayout = ooblayout;
}
static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
{
return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
}
int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
#ifndef __UBOOT__
int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
void **virt, resource_size_t *phys);
int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
#endif
unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
unsigned long offset, unsigned long flags);
int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
u_char *buf);
int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
const u_char *buf);
int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
const u_char *buf);
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf);
int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf);
int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf);
int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf);
int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, u_char *buf);
int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
#ifndef __UBOOT__
int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen);
#endif
static inline void mtd_sync(struct mtd_info *mtd)
{
if (mtd->_sync)
mtd->_sync(mtd);
}
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
#ifndef __UBOOT__
static inline int mtd_suspend(struct mtd_info *mtd)
{
return mtd->_suspend ? mtd->_suspend(mtd) : 0;
}
static inline void mtd_resume(struct mtd_info *mtd)
{
if (mtd->_resume)
mtd->_resume(mtd);
}
#endif
static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
{
if (mtd->erasesize_shift)
return sz >> mtd->erasesize_shift;
do_div(sz, mtd->erasesize);
return sz;
}
static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
{
if (mtd->erasesize_shift)
return sz & mtd->erasesize_mask;
return do_div(sz, mtd->erasesize);
}
static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
{
if (mtd->writesize_shift)
return sz >> mtd->writesize_shift;
do_div(sz, mtd->writesize);
return sz;
}
static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
{
if (mtd->writesize_shift)
return sz & mtd->writesize_mask;
return do_div(sz, mtd->writesize);
}
static inline int mtd_has_oob(const struct mtd_info *mtd)
{
return mtd->_read_oob && mtd->_write_oob;
}
static inline int mtd_type_is_nand(const struct mtd_info *mtd)
{
return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
}
static inline int mtd_can_have_bb(const struct mtd_info *mtd)
{
return !!mtd->_block_isbad;
}
/* Kernel-side ioctl definitions */
struct mtd_partition;
struct mtd_part_parser_data;
extern int mtd_device_parse_register(struct mtd_info *mtd,
const char * const *part_probe_types,
struct mtd_part_parser_data *parser_data,
const struct mtd_partition *defparts,
int defnr_parts);
#define mtd_device_register(master, parts, nr_parts) \
mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
extern int mtd_device_unregister(struct mtd_info *master);
extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern int __get_mtd_device(struct mtd_info *mtd);
extern void __put_mtd_device(struct mtd_info *mtd);
extern struct mtd_info *get_mtd_device_nm(const char *name);
extern void put_mtd_device(struct mtd_info *mtd);
#ifndef __UBOOT__
struct mtd_notifier {
void (*add)(struct mtd_info *mtd);
void (*remove)(struct mtd_info *mtd);
struct list_head list;
};
extern void register_mtd_user (struct mtd_notifier *new);
extern int unregister_mtd_user (struct mtd_notifier *old);
#endif
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
#ifdef CONFIG_MTD_PARTITIONS
void mtd_erase_callback(struct erase_info *instr);
#else
static inline void mtd_erase_callback(struct erase_info *instr)
{
if (instr->callback)
instr->callback(instr);
}
#endif
static inline int mtd_is_bitflip(int err) {
return err == -EUCLEAN;
}
static inline int mtd_is_eccerr(int err) {
return err == -EBADMSG;
}
static inline int mtd_is_bitflip_or_eccerr(int err) {
return mtd_is_bitflip(err) || mtd_is_eccerr(err);
}
unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
#ifdef __UBOOT__
/* drivers/mtd/mtdcore.h */
int add_mtd_device(struct mtd_info *mtd);
int del_mtd_device(struct mtd_info *mtd);
int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
int del_mtd_partitions(struct mtd_info *);
struct mtd_info *__mtd_next_device(int i);
#define mtd_for_each_device(mtd) \
for ((mtd) = __mtd_next_device(0); \
(mtd) != NULL; \
(mtd) = __mtd_next_device(mtd->index + 1))
int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size,
loff_t *maxsize, int devtype, uint64_t chipsize);
int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
loff_t *size, loff_t *maxsize, int devtype,
uint64_t chipsize);
/* drivers/mtd/mtdcore.c */
void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
const uint64_t length, uint64_t *len_incl_bad,
int *truncated);
/* drivers/mtd/mtd_uboot.c */
int mtd_search_alternate_name(const char *mtdname, char *altname,
unsigned int max_len);
#endif
#endif /* __MTD_MTD_H__ */
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