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#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
struct mtd_part {
struct mtd_info mtd;
struct mtd_info *master;
uint64_t offset;
struct list_head list;
};
#define PART(x) ((struct mtd_part *)(x))
static int mtd_part_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
struct mtd_ecc_stats stats;
int res;
stats = part->master->ecc_stats;
if (from >= mtd->size)
len = 0;
else if (from + len > mtd->size)
len = mtd->size - from;
res = part->master->read(part->master, from + part->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)
{
struct mtd_part *part = PART(mtd);
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (to >= mtd->size)
len = 0;
else if (to + len > mtd->size)
len = mtd->size - to;
return part->master->write(part->master, to + part->offset,
len, retlen, buf);
}
static int mtd_part_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_part *part = PART(mtd);
int ret;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (instr->addr >= mtd->size)
return -EINVAL;
instr->addr += part->offset;
ret = part->master->erase(part->master, instr);
if (ret) {
if (instr->fail_addr != 0xffffffff)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
}
return ret;
}
static int mtd_part_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
if (ofs >= mtd->size)
return -EINVAL;
ofs += part->offset;
return part->master->block_isbad(part->master, ofs);
}
static int mtd_part_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
int res;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (ofs >= mtd->size)
return -EINVAL;
ofs += part->offset;
res = part->master->block_markbad(part->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_part *slave;
struct mtd_info *slave_mtd;
int start = 0, end = 0, i;
slave = xzalloc(sizeof(*slave));
slave_mtd = &slave->mtd;
memcpy(slave_mtd, mtd, sizeof(*slave));
/*
* 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;
}
slave_mtd->numeraseregions = end - start;
slave_mtd->read = mtd_part_read;
slave_mtd->write = mtd_part_write;
slave_mtd->erase = mtd_part_erase;
slave_mtd->block_isbad = mtd->block_isbad ? mtd_part_block_isbad : NULL;
slave_mtd->block_markbad = mtd->block_markbad ? mtd_part_block_markbad : NULL;
slave_mtd->size = size;
slave_mtd->name = strdup(name);
slave->offset = offset;
slave->master = mtd;
return slave_mtd;
}
void mtd_del_partition(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
free(mtd->name);
free(part);
}
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