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#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
static int mtd_part_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_ecc_stats stats;
int res;
stats = mtd->master->ecc_stats;
if (from >= mtd->size)
len = 0;
else if (from + len > mtd->size)
len = mtd->size - from;
res = mtd->master->read(mtd->master, from + mtd->master_offset,
len, retlen, buf);
return res;
}
static int mtd_part_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (to >= mtd->size)
len = 0;
else if (to + len > mtd->size)
len = mtd->size - to;
return mtd->master->write(mtd->master, to + mtd->master_offset,
len, retlen, buf);
}
static int mtd_part_erase(struct mtd_info *mtd, struct erase_info *instr)
{
int ret;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (instr->addr >= mtd->size)
return -EINVAL;
instr->addr += mtd->master_offset;
ret = mtd->master->erase(mtd->master, instr);
if (ret) {
if (instr->fail_addr != 0xffffffff)
instr->fail_addr -= mtd->master_offset;
instr->addr -= mtd->master_offset;
}
return ret;
}
static int mtd_part_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
if (ofs >= mtd->size)
return -EINVAL;
ofs += mtd->master_offset;
return mtd_block_isbad(mtd->master, ofs);
}
static int mtd_part_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
int res;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (ofs >= mtd->size)
return -EINVAL;
ofs += mtd->master_offset;
res = mtd->master->block_markbad(mtd->master, ofs);
if (!res)
mtd->ecc_stats.badblocks++;
return res;
}
struct mtd_info *mtd_add_partition(struct mtd_info *mtd, off_t offset, size_t size,
unsigned long flags, const char *name)
{
struct mtd_info *part;
int start = 0, end = 0, i;
part = xzalloc(sizeof(*part));
part->type = mtd->type;
part->flags = mtd->flags;
part->parent = &mtd->class_dev;
part->erasesize = mtd->erasesize;
part->writesize = mtd->writesize;
part->writebufsize = mtd->writebufsize;
part->oobsize = mtd->oobsize;
part->oobavail = mtd->oobavail;
part->bitflip_threshold = mtd->bitflip_threshold;
part->ecclayout = mtd->ecclayout;
part->ecc_strength = mtd->ecc_strength;
part->subpage_sft = mtd->subpage_sft;
/*
* find the number of eraseregions the partition includes.
* Do not bother to create the mtd_erase_region_infos as
* ubi is only interested in its number. UBI does not
* yet support multiple erase regions.
*/
for (i = mtd->numeraseregions - 1; i >= 0; i--) {
struct mtd_erase_region_info *region = &mtd->eraseregions[i];
if (offset >= region->offset &&
offset < region->offset + region->erasesize * region->numblocks)
start = i;
if (offset + size >= region->offset &&
offset + size <= region->offset + region->erasesize * region->numblocks)
end = i;
}
part->numeraseregions = end - start;
part->read = mtd_part_read;
part->write = mtd_part_write;
part->erase = mtd_part_erase;
part->block_isbad = mtd->block_isbad ? mtd_part_block_isbad : NULL;
part->block_markbad = mtd->block_markbad ? mtd_part_block_markbad : NULL;
part->size = size;
part->name = strdup(name);
part->master_offset = offset;
part->master = mtd;
if (!strncmp(mtd->cdev.name, name, strlen(mtd->cdev.name)))
part->cdev.partname = xstrdup(name + strlen(mtd->cdev.name) + 1);
add_mtd_device(part, part->name, DEVICE_ID_SINGLE);
return part;
}
int mtd_del_partition(struct mtd_info *part)
{
if (!part->master)
return -EINVAL;
del_mtd_device(part);
free(part->cdev.partname);
free(part->name);
free(part);
return 0;
}
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