this allow to do not provide block_isbad at mtd driver level as example spi flash Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
#include <common.h>
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#include <errno.h>
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#include <malloc.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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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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#define PART(x) ((struct mtd_part *)(x))
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static int mtd_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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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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return res;
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}
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static int mtd_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 mtd_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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static int mtd_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 mtd_block_isbad(part->master, ofs);
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}
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static int mtd_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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struct mtd_info *mtd_add_partition(struct mtd_info *mtd, off_t offset, size_t size,
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unsigned long flags, const char *name)
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{
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struct mtd_part *slave;
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struct mtd_info *slave_mtd;
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int start = 0, end = 0, i;
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slave = xzalloc(sizeof(*slave));
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slave_mtd = &slave->mtd;
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memcpy(slave_mtd, mtd, sizeof(*slave));
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/*
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* find the number of eraseregions the partition includes.
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* Do not bother to create the mtd_erase_region_infos as
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* ubi is only interested in its number. UBI does not
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* yet support multiple erase regions.
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*/
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for (i = mtd->numeraseregions - 1; i >= 0; i--) {
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struct mtd_erase_region_info *region = &mtd->eraseregions[i];
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if (offset >= region->offset &&
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offset < region->offset + region->erasesize * region->numblocks)
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start = i;
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if (offset + size >= region->offset &&
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offset + size <= region->offset + region->erasesize * region->numblocks)
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end = i;
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}
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slave_mtd->numeraseregions = end - start;
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slave_mtd->read = mtd_part_read;
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slave_mtd->write = mtd_part_write;
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slave_mtd->erase = mtd_part_erase;
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slave_mtd->block_isbad = mtd->block_isbad ? mtd_part_block_isbad : NULL;
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slave_mtd->block_markbad = mtd->block_markbad ? mtd_part_block_markbad : NULL;
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slave_mtd->size = size;
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slave_mtd->name = strdup(name);
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slave->offset = offset;
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slave->master = mtd;
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return slave_mtd;
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}
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void mtd_del_partition(struct mtd_info *mtd)
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{
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struct mtd_part *part = PART(mtd);
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free(mtd->name);
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free(part);
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}
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