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42f209d3c9
Delete the allegedly obsolete "bank_size" member of struct mtd_info. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
567 lines
15 KiB
C
567 lines
15 KiB
C
/*
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* Simple MTD partitioning layer
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*
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* (C) 2000 Nicolas Pitre <nico@cam.org>
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*
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* This code is GPL
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*
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* $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
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*
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* 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
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* added support for read_oob, write_oob
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*/
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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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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/compatmac.h>
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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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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u_int32_t offset;
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int index;
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struct list_head list;
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int registered;
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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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/*
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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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int res;
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if (from >= mtd->size)
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len = 0;
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else if (from + len > mtd->size)
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len = mtd->size - from;
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res = part->master->read (part->master, from + part->offset,
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len, retlen, buf);
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if (unlikely(res)) {
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if (res == -EUCLEAN)
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mtd->ecc_stats.corrected++;
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if (res == -EBADMSG)
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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_point (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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if (from >= mtd->size)
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len = 0;
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else if (from + len > mtd->size)
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len = mtd->size - from;
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return part->master->point (part->master, from + part->offset,
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len, retlen, buf);
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}
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static void part_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
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{
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struct mtd_part *part = PART(mtd);
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part->master->unpoint (part->master, addr, from + part->offset, len);
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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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res = part->master->read_oob(part->master, from + part->offset, ops);
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if (unlikely(res)) {
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if (res == -EUCLEAN)
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mtd->ecc_stats.corrected++;
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if (res == -EBADMSG)
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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, 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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return part->master->read_user_prot_reg (part->master, from,
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len, retlen, buf);
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}
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static int part_get_user_prot_info (struct mtd_info *mtd,
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struct otp_info *buf, size_t len)
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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, buf, len);
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}
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static int part_read_fact_prot_reg (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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return part->master->read_fact_prot_reg (part->master, from,
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len, retlen, buf);
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}
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static int part_get_fact_prot_info (struct mtd_info *mtd,
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struct otp_info *buf, size_t len)
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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, buf, len);
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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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if (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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if (to >= mtd->size)
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len = 0;
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else if (to + len > mtd->size)
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len = mtd->size - to;
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return part->master->write (part->master, to + part->offset,
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len, 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 (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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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, 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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return part->master->write_user_prot_reg (part->master, from,
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len, retlen, buf);
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}
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static int part_lock_user_prot_reg (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->lock_user_prot_reg (part->master, from, len);
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}
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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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if (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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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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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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if (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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if (instr->addr >= mtd->size)
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return -EINVAL;
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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 != 0xffffffff)
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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 != 0xffffffff)
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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, size_t len)
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{
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struct mtd_part *part = PART(mtd);
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if ((len + ofs) > mtd->size)
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return -EINVAL;
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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, size_t len)
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{
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struct mtd_part *part = PART(mtd);
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if ((len + ofs) > mtd->size)
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return -EINVAL;
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return part->master->unlock(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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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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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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if (ofs >= mtd->size)
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return -EINVAL;
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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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if (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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if (ofs >= mtd->size)
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return -EINVAL;
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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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/*
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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 list_head *node;
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struct mtd_part *slave;
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for (node = mtd_partitions.next;
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node != &mtd_partitions;
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node = node->next) {
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slave = list_entry(node, struct mtd_part, list);
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if (slave->master == master) {
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struct list_head *prev = node->prev;
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__list_del(prev, node->next);
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if(slave->registered)
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del_mtd_device(&slave->mtd);
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kfree(slave);
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node = prev;
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}
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}
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return 0;
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}
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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* the partition definitions.
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* (Q: should we register the master MTD object as well?)
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*/
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int add_mtd_partitions(struct mtd_info *master,
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const struct mtd_partition *parts,
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int nbparts)
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{
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struct mtd_part *slave;
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u_int32_t cur_offset = 0;
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int i;
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printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
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for (i = 0; i < nbparts; i++) {
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/* allocate the partition structure */
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slave = kzalloc (sizeof(*slave), GFP_KERNEL);
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if (!slave) {
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printk ("memory allocation error while creating partitions for \"%s\"\n",
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master->name);
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del_mtd_partitions(master);
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return -ENOMEM;
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}
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list_add(&slave->list, &mtd_partitions);
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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 & ~parts[i].mask_flags;
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slave->mtd.size = parts[i].size;
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slave->mtd.writesize = master->writesize;
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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 = parts[i].name;
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slave->mtd.owner = master->owner;
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slave->mtd.read = part_read;
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slave->mtd.write = part_write;
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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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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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if (!i && master->suspend && 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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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->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 = parts[i].offset;
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slave->index = i;
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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 ((cur_offset % master->erasesize) != 0) {
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/* Round up to next erasesize */
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slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
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printk(KERN_NOTICE "Moving partition %d: "
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"0x%08x -> 0x%08x\n", i,
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cur_offset, slave->offset);
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}
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}
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if (slave->mtd.size == MTDPART_SIZ_FULL)
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slave->mtd.size = master->size - slave->offset;
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cur_offset = slave->offset + slave->mtd.size;
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printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
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slave->offset + slave->mtd.size, slave->mtd.name);
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/* let's do some sanity checks */
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if (slave->offset >= master->size) {
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/* let's register it anyway to preserve ordering */
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slave->offset = 0;
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slave->mtd.size = 0;
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printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
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parts[i].name);
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}
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if (slave->offset + slave->mtd.size > master->size) {
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slave->mtd.size = master->size - slave->offset;
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printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
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parts[i].name, master->name, slave->mtd.size);
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}
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if (master->numeraseregions>1) {
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/* Deal with variable erase size stuff */
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int i;
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struct mtd_erase_region_info *regions = master->eraseregions;
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/* Find the first erase regions which is part of this partition. */
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for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
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;
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for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
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if (slave->mtd.erasesize < regions[i].erasesize) {
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slave->mtd.erasesize = regions[i].erasesize;
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}
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}
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} else {
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/* Single erase size */
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slave->mtd.erasesize = master->erasesize;
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}
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if ((slave->mtd.flags & MTD_WRITEABLE) &&
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(slave->offset % slave->mtd.erasesize)) {
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/* Doesn't start on a boundary of major erase size */
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/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
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slave->mtd.flags &= ~MTD_WRITEABLE;
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printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
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parts[i].name);
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}
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if ((slave->mtd.flags & MTD_WRITEABLE) &&
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(slave->mtd.size % slave->mtd.erasesize)) {
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slave->mtd.flags &= ~MTD_WRITEABLE;
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printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
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parts[i].name);
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}
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slave->mtd.ecclayout = master->ecclayout;
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if (master->block_isbad) {
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uint32_t offs = 0;
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while(offs < slave->mtd.size) {
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if (master->block_isbad(master,
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offs + slave->offset))
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slave->mtd.ecc_stats.badblocks++;
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offs += slave->mtd.erasesize;
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}
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}
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if(parts[i].mtdp)
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{ /* store the object pointer (caller may or may not register it */
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*parts[i].mtdp = &slave->mtd;
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slave->registered = 0;
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}
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else
|
|
{
|
|
/* register our partition */
|
|
add_mtd_device(&slave->mtd);
|
|
slave->registered = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(add_mtd_partitions);
|
|
EXPORT_SYMBOL(del_mtd_partitions);
|
|
|
|
static DEFINE_SPINLOCK(part_parser_lock);
|
|
static LIST_HEAD(part_parsers);
|
|
|
|
static struct mtd_part_parser *get_partition_parser(const char *name)
|
|
{
|
|
struct list_head *this;
|
|
void *ret = NULL;
|
|
spin_lock(&part_parser_lock);
|
|
|
|
list_for_each(this, &part_parsers) {
|
|
struct mtd_part_parser *p = list_entry(this, struct mtd_part_parser, list);
|
|
|
|
if (!strcmp(p->name, name) && try_module_get(p->owner)) {
|
|
ret = p;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int register_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_add(&p->list, &part_parsers);
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int deregister_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_del(&p->list);
|
|
spin_unlock(&part_parser_lock);
|
|
return 0;
|
|
}
|
|
|
|
int parse_mtd_partitions(struct mtd_info *master, const char **types,
|
|
struct mtd_partition **pparts, unsigned long origin)
|
|
{
|
|
struct mtd_part_parser *parser;
|
|
int ret = 0;
|
|
|
|
for ( ; ret <= 0 && *types; types++) {
|
|
parser = get_partition_parser(*types);
|
|
#ifdef CONFIG_KMOD
|
|
if (!parser && !request_module("%s", *types))
|
|
parser = get_partition_parser(*types);
|
|
#endif
|
|
if (!parser) {
|
|
printk(KERN_NOTICE "%s partition parsing not available\n",
|
|
*types);
|
|
continue;
|
|
}
|
|
ret = (*parser->parse_fn)(master, pparts, origin);
|
|
if (ret > 0) {
|
|
printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
|
|
ret, parser->name, master->name);
|
|
}
|
|
put_partition_parser(parser);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(parse_mtd_partitions);
|
|
EXPORT_SYMBOL_GPL(register_mtd_parser);
|
|
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
|
|
MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");
|