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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
835 lines
22 KiB
C
835 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Simple MTD partitioning layer
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*
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* Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
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* Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
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* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
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*
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*/
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#ifndef __UBOOT__
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/kmod.h>
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#endif
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#include <common.h>
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#include <malloc.h>
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#include <linux/errno.h>
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#include <linux/compat.h>
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#include <ubi_uboot.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/err.h>
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#include "mtdcore.h"
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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#ifndef __UBOOT__
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static DEFINE_MUTEX(mtd_partitions_mutex);
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#else
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DEFINE_MUTEX(mtd_partitions_mutex);
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#endif
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/* Our partition node structure */
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struct mtd_part {
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struct mtd_info mtd;
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struct mtd_info *master;
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uint64_t offset;
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struct list_head list;
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};
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/*
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* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
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* the pointer to that structure with this macro.
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*/
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#define PART(x) ((struct mtd_part *)(x))
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#ifdef __UBOOT__
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/* from mm/util.c */
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/**
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* kstrdup - allocate space for and copy an existing string
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* @s: the string to duplicate
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* @gfp: the GFP mask used in the kmalloc() call when allocating memory
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*/
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char *kstrdup(const char *s, gfp_t gfp)
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{
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size_t len;
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char *buf;
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if (!s)
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return NULL;
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len = strlen(s) + 1;
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buf = kmalloc(len, gfp);
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if (buf)
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memcpy(buf, s, len);
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return buf;
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}
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#endif
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/*
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* MTD methods which simply translate the effective address and pass through
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* to the _real_ device.
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*/
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static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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struct mtd_ecc_stats stats;
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int res;
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stats = part->master->ecc_stats;
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res = part->master->_read(part->master, from + part->offset, len,
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retlen, buf);
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if (unlikely(mtd_is_eccerr(res)))
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mtd->ecc_stats.failed +=
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part->master->ecc_stats.failed - stats.failed;
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else
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mtd->ecc_stats.corrected +=
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part->master->ecc_stats.corrected - stats.corrected;
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return res;
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}
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#ifndef __UBOOT__
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static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, void **virt, resource_size_t *phys)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_point(part->master, from + part->offset, len,
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retlen, virt, phys);
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}
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static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_unpoint(part->master, from + part->offset, len);
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}
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#endif
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static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
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unsigned long len,
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unsigned long offset,
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unsigned long flags)
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{
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struct mtd_part *part = PART(mtd);
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offset += part->offset;
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return part->master->_get_unmapped_area(part->master, len, offset,
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flags);
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}
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static int part_read_oob(struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops)
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{
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struct mtd_part *part = PART(mtd);
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int res;
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if (from >= mtd->size)
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return -EINVAL;
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if (ops->datbuf && from + ops->len > mtd->size)
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return -EINVAL;
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/*
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* If OOB is also requested, make sure that we do not read past the end
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* of this partition.
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*/
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if (ops->oobbuf) {
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size_t len, pages;
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if (ops->mode == MTD_OPS_AUTO_OOB)
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len = mtd->oobavail;
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else
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len = mtd->oobsize;
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pages = mtd_div_by_ws(mtd->size, mtd);
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pages -= mtd_div_by_ws(from, mtd);
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if (ops->ooboffs + ops->ooblen > pages * len)
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return -EINVAL;
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}
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res = part->master->_read_oob(part->master, from + part->offset, ops);
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if (unlikely(res)) {
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if (mtd_is_bitflip(res))
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mtd->ecc_stats.corrected++;
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if (mtd_is_eccerr(res))
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mtd->ecc_stats.failed++;
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}
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return res;
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}
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static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_read_user_prot_reg(part->master, from, len,
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retlen, buf);
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}
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static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_get_user_prot_info(part->master, len, retlen,
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buf);
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}
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static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_read_fact_prot_reg(part->master, from, len,
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retlen, buf);
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}
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static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_get_fact_prot_info(part->master, len, retlen,
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buf);
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}
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static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_write(part->master, to + part->offset, len,
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retlen, buf);
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}
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static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_panic_write(part->master, to + part->offset, len,
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retlen, buf);
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}
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static int part_write_oob(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops)
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{
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struct mtd_part *part = PART(mtd);
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if (to >= mtd->size)
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return -EINVAL;
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if (ops->datbuf && to + ops->len > mtd->size)
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return -EINVAL;
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return part->master->_write_oob(part->master, to + part->offset, ops);
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}
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static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_write_user_prot_reg(part->master, from, len,
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retlen, buf);
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}
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static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_lock_user_prot_reg(part->master, from, len);
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}
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#ifndef __UBOOT__
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static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_writev(part->master, vecs, count,
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to + part->offset, retlen);
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}
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#endif
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static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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struct mtd_part *part = PART(mtd);
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int ret;
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instr->addr += part->offset;
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ret = part->master->_erase(part->master, instr);
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if (ret) {
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if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr -= part->offset;
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instr->addr -= part->offset;
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}
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return ret;
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}
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void mtd_erase_callback(struct erase_info *instr)
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{
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if (instr->mtd->_erase == part_erase) {
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struct mtd_part *part = PART(instr->mtd);
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if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr -= part->offset;
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instr->addr -= part->offset;
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}
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if (instr->callback)
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instr->callback(instr);
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}
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EXPORT_SYMBOL_GPL(mtd_erase_callback);
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static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_lock(part->master, ofs + part->offset, len);
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}
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static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_unlock(part->master, ofs + part->offset, len);
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}
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static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_is_locked(part->master, ofs + part->offset, len);
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}
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static void part_sync(struct mtd_info *mtd)
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{
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struct mtd_part *part = PART(mtd);
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part->master->_sync(part->master);
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}
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#ifndef __UBOOT__
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static int part_suspend(struct mtd_info *mtd)
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{
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struct mtd_part *part = PART(mtd);
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return part->master->_suspend(part->master);
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}
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static void part_resume(struct mtd_info *mtd)
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{
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struct mtd_part *part = PART(mtd);
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part->master->_resume(part->master);
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}
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#endif
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static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = PART(mtd);
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ofs += part->offset;
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return part->master->_block_isreserved(part->master, ofs);
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}
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static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = PART(mtd);
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ofs += part->offset;
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return part->master->_block_isbad(part->master, ofs);
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}
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static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = PART(mtd);
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int res;
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ofs += part->offset;
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res = part->master->_block_markbad(part->master, ofs);
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if (!res)
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mtd->ecc_stats.badblocks++;
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return res;
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}
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static inline void free_partition(struct mtd_part *p)
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{
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kfree(p->mtd.name);
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kfree(p);
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}
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/*
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* This function unregisters and destroy all slave MTD objects which are
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* attached to the given master MTD object.
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*/
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int del_mtd_partitions(struct mtd_info *master)
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{
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struct mtd_part *slave, *next;
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int ret, err = 0;
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mutex_lock(&mtd_partitions_mutex);
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list_for_each_entry_safe(slave, next, &mtd_partitions, list)
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if (slave->master == master) {
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ret = del_mtd_device(&slave->mtd);
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if (ret < 0) {
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err = ret;
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continue;
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}
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list_del(&slave->list);
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free_partition(slave);
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}
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mutex_unlock(&mtd_partitions_mutex);
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return err;
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}
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static struct mtd_part *allocate_partition(struct mtd_info *master,
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const struct mtd_partition *part, int partno,
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uint64_t cur_offset)
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{
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struct mtd_part *slave;
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char *name;
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/* allocate the partition structure */
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slave = kzalloc(sizeof(*slave), GFP_KERNEL);
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name = kstrdup(part->name, GFP_KERNEL);
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if (!name || !slave) {
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printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
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master->name);
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kfree(name);
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kfree(slave);
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return ERR_PTR(-ENOMEM);
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}
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/* set up the MTD object for this partition */
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slave->mtd.type = master->type;
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slave->mtd.flags = master->flags & ~part->mask_flags;
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slave->mtd.size = part->size;
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slave->mtd.writesize = master->writesize;
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slave->mtd.writebufsize = master->writebufsize;
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slave->mtd.oobsize = master->oobsize;
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slave->mtd.oobavail = master->oobavail;
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slave->mtd.subpage_sft = master->subpage_sft;
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slave->mtd.name = name;
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slave->mtd.owner = master->owner;
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#ifndef __UBOOT__
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slave->mtd.backing_dev_info = master->backing_dev_info;
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/* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
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* to have the same data be in two different partitions.
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*/
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slave->mtd.dev.parent = master->dev.parent;
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#endif
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slave->mtd._read = part_read;
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slave->mtd._write = part_write;
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if (master->_panic_write)
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slave->mtd._panic_write = part_panic_write;
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#ifndef __UBOOT__
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if (master->_point && master->_unpoint) {
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slave->mtd._point = part_point;
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slave->mtd._unpoint = part_unpoint;
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}
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#endif
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if (master->_get_unmapped_area)
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slave->mtd._get_unmapped_area = part_get_unmapped_area;
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if (master->_read_oob)
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slave->mtd._read_oob = part_read_oob;
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if (master->_write_oob)
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slave->mtd._write_oob = part_write_oob;
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if (master->_read_user_prot_reg)
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slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
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if (master->_read_fact_prot_reg)
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slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
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if (master->_write_user_prot_reg)
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slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
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if (master->_lock_user_prot_reg)
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slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
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if (master->_get_user_prot_info)
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slave->mtd._get_user_prot_info = part_get_user_prot_info;
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if (master->_get_fact_prot_info)
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slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
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if (master->_sync)
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slave->mtd._sync = part_sync;
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#ifndef __UBOOT__
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if (!partno && !master->dev.class && master->_suspend &&
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master->_resume) {
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slave->mtd._suspend = part_suspend;
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slave->mtd._resume = part_resume;
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}
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if (master->_writev)
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slave->mtd._writev = part_writev;
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#endif
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if (master->_lock)
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slave->mtd._lock = part_lock;
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if (master->_unlock)
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slave->mtd._unlock = part_unlock;
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if (master->_is_locked)
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slave->mtd._is_locked = part_is_locked;
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if (master->_block_isreserved)
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slave->mtd._block_isreserved = part_block_isreserved;
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if (master->_block_isbad)
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slave->mtd._block_isbad = part_block_isbad;
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if (master->_block_markbad)
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slave->mtd._block_markbad = part_block_markbad;
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slave->mtd._erase = part_erase;
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slave->master = master;
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slave->offset = part->offset;
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if (slave->offset == MTDPART_OFS_APPEND)
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slave->offset = cur_offset;
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if (slave->offset == MTDPART_OFS_NXTBLK) {
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slave->offset = cur_offset;
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if (mtd_mod_by_eb(cur_offset, master) != 0) {
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/* Round up to next erasesize */
|
|
slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
|
|
debug("Moving partition %d: "
|
|
"0x%012llx -> 0x%012llx\n", partno,
|
|
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
|
|
}
|
|
}
|
|
if (slave->offset == MTDPART_OFS_RETAIN) {
|
|
slave->offset = cur_offset;
|
|
if (master->size - slave->offset >= slave->mtd.size) {
|
|
slave->mtd.size = master->size - slave->offset
|
|
- slave->mtd.size;
|
|
} else {
|
|
debug("mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
|
|
part->name, master->size - slave->offset,
|
|
slave->mtd.size);
|
|
/* register to preserve ordering */
|
|
goto out_register;
|
|
}
|
|
}
|
|
if (slave->mtd.size == MTDPART_SIZ_FULL)
|
|
slave->mtd.size = master->size - slave->offset;
|
|
|
|
debug("0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
|
|
(unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
|
|
|
|
/* let's do some sanity checks */
|
|
if (slave->offset >= master->size) {
|
|
/* let's register it anyway to preserve ordering */
|
|
slave->offset = 0;
|
|
slave->mtd.size = 0;
|
|
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
|
|
part->name);
|
|
goto out_register;
|
|
}
|
|
if (slave->offset + slave->mtd.size > master->size) {
|
|
slave->mtd.size = master->size - slave->offset;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
|
|
part->name, master->name, (unsigned long long)slave->mtd.size);
|
|
}
|
|
if (master->numeraseregions > 1) {
|
|
/* Deal with variable erase size stuff */
|
|
int i, max = master->numeraseregions;
|
|
u64 end = slave->offset + slave->mtd.size;
|
|
struct mtd_erase_region_info *regions = master->eraseregions;
|
|
|
|
/* Find the first erase regions which is part of this
|
|
* partition. */
|
|
for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
|
|
;
|
|
/* The loop searched for the region _behind_ the first one */
|
|
if (i > 0)
|
|
i--;
|
|
|
|
/* Pick biggest erasesize */
|
|
for (; i < max && regions[i].offset < end; i++) {
|
|
if (slave->mtd.erasesize < regions[i].erasesize) {
|
|
slave->mtd.erasesize = regions[i].erasesize;
|
|
}
|
|
}
|
|
BUG_ON(slave->mtd.erasesize == 0);
|
|
} else {
|
|
/* Single erase size */
|
|
slave->mtd.erasesize = master->erasesize;
|
|
}
|
|
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
|
|
/* Doesn't start on a boundary of major erase size */
|
|
/* FIXME: Let it be writable if it is on a boundary of
|
|
* _minor_ erase size though */
|
|
slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
|
part->name);
|
|
}
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
|
|
slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
|
part->name);
|
|
}
|
|
|
|
slave->mtd.ecclayout = master->ecclayout;
|
|
slave->mtd.ecc_step_size = master->ecc_step_size;
|
|
slave->mtd.ecc_strength = master->ecc_strength;
|
|
slave->mtd.bitflip_threshold = master->bitflip_threshold;
|
|
|
|
if (master->_block_isbad) {
|
|
uint64_t offs = 0;
|
|
|
|
while (offs < slave->mtd.size) {
|
|
if (mtd_block_isbad(master, offs + slave->offset))
|
|
slave->mtd.ecc_stats.badblocks++;
|
|
offs += slave->mtd.erasesize;
|
|
}
|
|
}
|
|
|
|
out_register:
|
|
return slave;
|
|
}
|
|
|
|
#ifndef __UBOOT__
|
|
int mtd_add_partition(struct mtd_info *master, const char *name,
|
|
long long offset, long long length)
|
|
{
|
|
struct mtd_partition part;
|
|
struct mtd_part *p, *new;
|
|
uint64_t start, end;
|
|
int ret = 0;
|
|
|
|
/* the direct offset is expected */
|
|
if (offset == MTDPART_OFS_APPEND ||
|
|
offset == MTDPART_OFS_NXTBLK)
|
|
return -EINVAL;
|
|
|
|
if (length == MTDPART_SIZ_FULL)
|
|
length = master->size - offset;
|
|
|
|
if (length <= 0)
|
|
return -EINVAL;
|
|
|
|
part.name = name;
|
|
part.size = length;
|
|
part.offset = offset;
|
|
part.mask_flags = 0;
|
|
part.ecclayout = NULL;
|
|
|
|
new = allocate_partition(master, &part, -1, offset);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
|
|
start = offset;
|
|
end = offset + length;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry(p, &mtd_partitions, list)
|
|
if (p->master == master) {
|
|
if ((start >= p->offset) &&
|
|
(start < (p->offset + p->mtd.size)))
|
|
goto err_inv;
|
|
|
|
if ((end >= p->offset) &&
|
|
(end < (p->offset + p->mtd.size)))
|
|
goto err_inv;
|
|
}
|
|
|
|
list_add(&new->list, &mtd_partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(&new->mtd);
|
|
|
|
return ret;
|
|
err_inv:
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
free_partition(new);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_add_partition);
|
|
|
|
int mtd_del_partition(struct mtd_info *master, int partno)
|
|
{
|
|
struct mtd_part *slave, *next;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
|
|
if ((slave->master == master) &&
|
|
(slave->mtd.index == partno)) {
|
|
ret = del_mtd_device(&slave->mtd);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
list_del(&slave->list);
|
|
free_partition(slave);
|
|
break;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_del_partition);
|
|
#endif
|
|
|
|
/*
|
|
* This function, given a master MTD object and a partition table, creates
|
|
* and registers slave MTD objects which are bound to the master according to
|
|
* the partition definitions.
|
|
*
|
|
* We don't register the master, or expect the caller to have done so,
|
|
* for reasons of data integrity.
|
|
*/
|
|
|
|
int add_mtd_partitions(struct mtd_info *master,
|
|
const struct mtd_partition *parts,
|
|
int nbparts)
|
|
{
|
|
struct mtd_part *slave;
|
|
uint64_t cur_offset = 0;
|
|
int i;
|
|
|
|
#ifdef __UBOOT__
|
|
/*
|
|
* Need to init the list here, since LIST_INIT() does not
|
|
* work on platforms where relocation has problems (like MIPS
|
|
* & PPC).
|
|
*/
|
|
if (mtd_partitions.next == NULL)
|
|
INIT_LIST_HEAD(&mtd_partitions);
|
|
#endif
|
|
|
|
debug("Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
|
|
|
|
for (i = 0; i < nbparts; i++) {
|
|
slave = allocate_partition(master, parts + i, i, cur_offset);
|
|
if (IS_ERR(slave))
|
|
return PTR_ERR(slave);
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_add(&slave->list, &mtd_partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(&slave->mtd);
|
|
|
|
cur_offset = slave->offset + slave->mtd.size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifndef __UBOOT__
|
|
static DEFINE_SPINLOCK(part_parser_lock);
|
|
static LIST_HEAD(part_parsers);
|
|
|
|
static struct mtd_part_parser *get_partition_parser(const char *name)
|
|
{
|
|
struct mtd_part_parser *p, *ret = NULL;
|
|
|
|
spin_lock(&part_parser_lock);
|
|
|
|
list_for_each_entry(p, &part_parsers, list)
|
|
if (!strcmp(p->name, name) && try_module_get(p->owner)) {
|
|
ret = p;
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
|
|
|
|
void register_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_add(&p->list, &part_parsers);
|
|
spin_unlock(&part_parser_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_mtd_parser);
|
|
|
|
void deregister_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_del(&p->list);
|
|
spin_unlock(&part_parser_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
|
|
|
|
/*
|
|
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
|
|
* are changing this array!
|
|
*/
|
|
static const char * const default_mtd_part_types[] = {
|
|
"cmdlinepart",
|
|
"ofpart",
|
|
NULL
|
|
};
|
|
|
|
/**
|
|
* parse_mtd_partitions - parse MTD partitions
|
|
* @master: the master partition (describes whole MTD device)
|
|
* @types: names of partition parsers to try or %NULL
|
|
* @pparts: array of partitions found is returned here
|
|
* @data: MTD partition parser-specific data
|
|
*
|
|
* This function tries to find partition on MTD device @master. It uses MTD
|
|
* partition parsers, specified in @types. However, if @types is %NULL, then
|
|
* the default list of parsers is used. The default list contains only the
|
|
* "cmdlinepart" and "ofpart" parsers ATM.
|
|
* Note: If there are more then one parser in @types, the kernel only takes the
|
|
* partitions parsed out by the first parser.
|
|
*
|
|
* This function may return:
|
|
* o a negative error code in case of failure
|
|
* o zero if no partitions were found
|
|
* o a positive number of found partitions, in which case on exit @pparts will
|
|
* point to an array containing this number of &struct mtd_info objects.
|
|
*/
|
|
int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
|
|
struct mtd_partition **pparts,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_part_parser *parser;
|
|
int ret = 0;
|
|
|
|
if (!types)
|
|
types = default_mtd_part_types;
|
|
|
|
for ( ; ret <= 0 && *types; types++) {
|
|
parser = get_partition_parser(*types);
|
|
if (!parser && !request_module("%s", *types))
|
|
parser = get_partition_parser(*types);
|
|
if (!parser)
|
|
continue;
|
|
ret = (*parser->parse_fn)(master, pparts, data);
|
|
put_partition_parser(parser);
|
|
if (ret > 0) {
|
|
printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
|
|
ret, parser->name, master->name);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int mtd_is_partition(const struct mtd_info *mtd)
|
|
{
|
|
struct mtd_part *part;
|
|
int ispart = 0;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry(part, &mtd_partitions, list)
|
|
if (&part->mtd == mtd) {
|
|
ispart = 1;
|
|
break;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ispart;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_is_partition);
|
|
|
|
/* Returns the size of the entire flash chip */
|
|
uint64_t mtd_get_device_size(const struct mtd_info *mtd)
|
|
{
|
|
if (!mtd_is_partition(mtd))
|
|
return mtd->size;
|
|
|
|
return PART(mtd)->master->size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_device_size);
|