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-rw-r--r--drivers/mtd/mtdcore.c189
-rw-r--r--drivers/mtd/mtdpart.c54
-rw-r--r--include/linux/mtd/mtd.h7
-rw-r--r--include/linux/mtd/partitions.h2
-rw-r--r--include/uapi/mtd/mtd-abi.h1
5 files changed, 213 insertions, 40 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 2916674208b3..50437b4ffe76 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -617,6 +617,19 @@ int add_mtd_device(struct mtd_info *mtd)
!(mtd->flags & MTD_NO_ERASE)))
return -EINVAL;
+ /*
+ * MTD_SLC_ON_MLC_EMULATION can only be set on partitions, when the
+ * master is an MLC NAND and has a proper pairing scheme defined.
+ * We also reject masters that implement ->_writev() for now, because
+ * NAND controller drivers don't implement this hook, and adding the
+ * SLC -> MLC address/length conversion to this path is useless if we
+ * don't have a user.
+ */
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION &&
+ (!mtd_is_partition(mtd) || master->type != MTD_MLCNANDFLASH ||
+ !master->pairing || master->_writev))
+ return -EINVAL;
+
mutex_lock(&mtd_table_mutex);
i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL);
@@ -632,6 +645,14 @@ int add_mtd_device(struct mtd_info *mtd)
if (mtd->bitflip_threshold == 0)
mtd->bitflip_threshold = mtd->ecc_strength;
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ int ngroups = mtd_pairing_groups(master);
+
+ mtd->erasesize /= ngroups;
+ mtd->size = (u64)mtd_div_by_eb(mtd->size, master) *
+ mtd->erasesize;
+ }
+
if (is_power_of_2(mtd->erasesize))
mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
else
@@ -1074,9 +1095,11 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_info *master = mtd_get_master(mtd);
u64 mst_ofs = mtd_get_master_ofs(mtd, 0);
+ struct erase_info adjinstr;
int ret;
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
+ adjinstr = *instr;
if (!mtd->erasesize || !master->_erase)
return -ENOTSUPP;
@@ -1091,12 +1114,27 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
ledtrig_mtd_activity();
- instr->addr += mst_ofs;
- ret = master->_erase(master, instr);
- if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
- instr->fail_addr -= mst_ofs;
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ adjinstr.addr = (loff_t)mtd_div_by_eb(instr->addr, mtd) *
+ master->erasesize;
+ adjinstr.len = ((u64)mtd_div_by_eb(instr->addr + instr->len, mtd) *
+ master->erasesize) -
+ adjinstr.addr;
+ }
+
+ adjinstr.addr += mst_ofs;
+
+ ret = master->_erase(master, &adjinstr);
+
+ if (adjinstr.fail_addr != MTD_FAIL_ADDR_UNKNOWN) {
+ instr->fail_addr = adjinstr.fail_addr - mst_ofs;
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ instr->fail_addr = mtd_div_by_eb(instr->fail_addr,
+ master);
+ instr->fail_addr *= mtd->erasesize;
+ }
+ }
- instr->addr -= mst_ofs;
return ret;
}
EXPORT_SYMBOL_GPL(mtd_erase);
@@ -1276,6 +1314,101 @@ static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs,
return 0;
}
+static int mtd_read_oob_std(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_info *master = mtd_get_master(mtd);
+ int ret;
+
+ from = mtd_get_master_ofs(mtd, from);
+ if (master->_read_oob)
+ ret = master->_read_oob(master, from, ops);
+ else
+ ret = master->_read(master, from, ops->len, &ops->retlen,
+ ops->datbuf);
+
+ return ret;
+}
+
+static int mtd_write_oob_std(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_info *master = mtd_get_master(mtd);
+ int ret;
+
+ to = mtd_get_master_ofs(mtd, to);
+ if (master->_write_oob)
+ ret = master->_write_oob(master, to, ops);
+ else
+ ret = master->_write(master, to, ops->len, &ops->retlen,
+ ops->datbuf);
+
+ return ret;
+}
+
+static int mtd_io_emulated_slc(struct mtd_info *mtd, loff_t start, bool read,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_info *master = mtd_get_master(mtd);
+ int ngroups = mtd_pairing_groups(master);
+ int npairs = mtd_wunit_per_eb(master) / ngroups;
+ struct mtd_oob_ops adjops = *ops;
+ unsigned int wunit, oobavail;
+ struct mtd_pairing_info info;
+ int max_bitflips = 0;
+ u32 ebofs, pageofs;
+ loff_t base, pos;
+
+ ebofs = mtd_mod_by_eb(start, mtd);
+ base = (loff_t)mtd_div_by_eb(start, mtd) * master->erasesize;
+ info.group = 0;
+ info.pair = mtd_div_by_ws(ebofs, mtd);
+ pageofs = mtd_mod_by_ws(ebofs, mtd);
+ oobavail = mtd_oobavail(mtd, ops);
+
+ while (ops->retlen < ops->len || ops->oobretlen < ops->ooblen) {
+ int ret;
+
+ if (info.pair >= npairs) {
+ info.pair = 0;
+ base += master->erasesize;
+ }
+
+ wunit = mtd_pairing_info_to_wunit(master, &info);
+ pos = mtd_wunit_to_offset(mtd, base, wunit);
+
+ adjops.len = ops->len - ops->retlen;
+ if (adjops.len > mtd->writesize - pageofs)
+ adjops.len = mtd->writesize - pageofs;
+
+ adjops.ooblen = ops->ooblen - ops->oobretlen;
+ if (adjops.ooblen > oobavail - adjops.ooboffs)
+ adjops.ooblen = oobavail - adjops.ooboffs;
+
+ if (read) {
+ ret = mtd_read_oob_std(mtd, pos + pageofs, &adjops);
+ if (ret > 0)
+ max_bitflips = max(max_bitflips, ret);
+ } else {
+ ret = mtd_write_oob_std(mtd, pos + pageofs, &adjops);
+ }
+
+ if (ret < 0)
+ return ret;
+
+ max_bitflips = max(max_bitflips, ret);
+ ops->retlen += adjops.retlen;
+ ops->oobretlen += adjops.oobretlen;
+ adjops.datbuf += adjops.retlen;
+ adjops.oobbuf += adjops.oobretlen;
+ adjops.ooboffs = 0;
+ pageofs = 0;
+ info.pair++;
+ }
+
+ return max_bitflips;
+}
+
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
{
struct mtd_info *master = mtd_get_master(mtd);
@@ -1294,12 +1427,10 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
if (!master->_read_oob && (!master->_read || ops->oobbuf))
return -EOPNOTSUPP;
- from = mtd_get_master_ofs(mtd, from);
- if (master->_read_oob)
- ret_code = master->_read_oob(master, from, ops);
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
+ ret_code = mtd_io_emulated_slc(mtd, from, true, ops);
else
- ret_code = master->_read(master, from, ops->len, &ops->retlen,
- ops->datbuf);
+ ret_code = mtd_read_oob_std(mtd, from, ops);
mtd_update_ecc_stats(mtd, master, &old_stats);
@@ -1338,13 +1469,10 @@ int mtd_write_oob(struct mtd_info *mtd, loff_t to,
if (!master->_write_oob && (!master->_write || ops->oobbuf))
return -EOPNOTSUPP;
- to = mtd_get_master_ofs(mtd, to);
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
+ return mtd_io_emulated_slc(mtd, to, false, ops);
- if (master->_write_oob)
- return master->_write_oob(master, to, ops);
- else
- return master->_write(master, to, ops->len, &ops->retlen,
- ops->datbuf);
+ return mtd_write_oob_std(mtd, to, ops);
}
EXPORT_SYMBOL_GPL(mtd_write_oob);
@@ -1817,6 +1945,12 @@ int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return -EINVAL;
if (!len)
return 0;
+
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+ len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
+ }
+
return master->_lock(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_lock);
@@ -1831,6 +1965,12 @@ int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return -EINVAL;
if (!len)
return 0;
+
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+ len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
+ }
+
return master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_unlock);
@@ -1845,6 +1985,12 @@ int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return -EINVAL;
if (!len)
return 0;
+
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) {
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+ len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
+ }
+
return master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_is_locked);
@@ -1857,6 +2003,10 @@ int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
return -EINVAL;
if (!master->_block_isreserved)
return 0;
+
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+
return master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs));
}
EXPORT_SYMBOL_GPL(mtd_block_isreserved);
@@ -1869,6 +2019,10 @@ int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
return -EINVAL;
if (!master->_block_isbad)
return 0;
+
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+
return master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs));
}
EXPORT_SYMBOL_GPL(mtd_block_isbad);
@@ -1885,6 +2039,9 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
+ if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
+ ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;
+
ret = master->_block_markbad(master, mtd_get_master_ofs(mtd, ofs));
if (ret)
return ret;
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 3f6025684f58..c3575b686f79 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -35,9 +35,12 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
const struct mtd_partition *part,
int partno, uint64_t cur_offset)
{
- int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize :
- parent->erasesize;
- struct mtd_info *child, *master = mtd_get_master(parent);
+ struct mtd_info *master = mtd_get_master(parent);
+ int wr_alignment = (parent->flags & MTD_NO_ERASE) ?
+ master->writesize : master->erasesize;
+ u64 parent_size = mtd_is_partition(parent) ?
+ parent->part.size : parent->size;
+ struct mtd_info *child;
u32 remainder;
char *name;
u64 tmp;
@@ -56,8 +59,9 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
/* set up the MTD object for this partition */
child->type = parent->type;
child->part.flags = parent->flags & ~part->mask_flags;
+ child->part.flags |= part->add_flags;
child->flags = child->part.flags;
- child->size = part->size;
+ child->part.size = part->size;
child->writesize = parent->writesize;
child->writebufsize = parent->writebufsize;
child->oobsize = parent->oobsize;
@@ -98,29 +102,29 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
}
if (child->part.offset == MTDPART_OFS_RETAIN) {
child->part.offset = cur_offset;
- if (parent->size - child->part.offset >= child->size) {
- child->size = parent->size - child->part.offset -
- child->size;
+ if (parent_size - child->part.offset >= child->part.size) {
+ child->part.size = parent_size - child->part.offset -
+ child->part.size;
} else {
printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
- part->name, parent->size - child->part.offset,
- child->size);
+ part->name, parent_size - child->part.offset,
+ child->part.size);
/* register to preserve ordering */
goto out_register;
}
}
- if (child->size == MTDPART_SIZ_FULL)
- child->size = parent->size - child->part.offset;
+ if (child->part.size == MTDPART_SIZ_FULL)
+ child->part.size = parent_size - child->part.offset;
printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n",
- child->part.offset, child->part.offset + child->size,
+ child->part.offset, child->part.offset + child->part.size,
child->name);
/* let's do some sanity checks */
- if (child->part.offset >= parent->size) {
+ if (child->part.offset >= parent_size) {
/* let's register it anyway to preserve ordering */
child->part.offset = 0;
- child->size = 0;
+ child->part.size = 0;
/* Initialize ->erasesize to make add_mtd_device() happy. */
child->erasesize = parent->erasesize;
@@ -128,15 +132,16 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
goto out_register;
}
- if (child->part.offset + child->size > parent->size) {
- child->size = parent->size - child->part.offset;
+ if (child->part.offset + child->part.size > parent->size) {
+ child->part.size = parent_size - child->part.offset;
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
- part->name, parent->name, child->size);
+ part->name, parent->name, child->part.size);
}
+
if (parent->numeraseregions > 1) {
/* Deal with variable erase size stuff */
int i, max = parent->numeraseregions;
- u64 end = child->part.offset + child->size;
+ u64 end = child->part.offset + child->part.size;
struct mtd_erase_region_info *regions = parent->eraseregions;
/* Find the first erase regions which is part of this
@@ -156,7 +161,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
BUG_ON(child->erasesize == 0);
} else {
/* Single erase size */
- child->erasesize = parent->erasesize;
+ child->erasesize = master->erasesize;
}
/*
@@ -178,7 +183,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
}
- tmp = mtd_get_master_ofs(child, 0) + child->size;
+ tmp = mtd_get_master_ofs(child, 0) + child->part.size;
remainder = do_div(tmp, wr_alignment);
if ((child->flags & MTD_WRITEABLE) && remainder) {
child->flags &= ~MTD_WRITEABLE;
@@ -186,6 +191,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
}
+ child->size = child->part.size;
child->ecc_step_size = parent->ecc_step_size;
child->ecc_strength = parent->ecc_strength;
child->bitflip_threshold = parent->bitflip_threshold;
@@ -193,7 +199,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
if (master->_block_isbad) {
uint64_t offs = 0;
- while (offs < child->size) {
+ while (offs < child->part.size) {
if (mtd_block_isreserved(child, offs))
child->ecc_stats.bbtblocks++;
else if (mtd_block_isbad(child, offs))
@@ -234,6 +240,8 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
long long offset, long long length)
{
struct mtd_info *master = mtd_get_master(parent);
+ u64 parent_size = mtd_is_partition(parent) ?
+ parent->part.size : parent->size;
struct mtd_partition part;
struct mtd_info *child;
int ret = 0;
@@ -244,7 +252,7 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
return -EINVAL;
if (length == MTDPART_SIZ_FULL)
- length = parent->size - offset;
+ length = parent_size - offset;
if (length <= 0)
return -EINVAL;
@@ -419,7 +427,7 @@ int add_mtd_partitions(struct mtd_info *parent,
/* Look for subpartitions */
parse_mtd_partitions(child, parts[i].types, NULL);
- cur_offset = child->part.offset + child->size;
+ cur_offset = child->part.offset + child->part.size;
}
return 0;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 2d1f4a61f4ac..157357ec1441 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -200,6 +200,8 @@ struct mtd_debug_info {
*
* @node: list node used to add an MTD partition to the parent partition list
* @offset: offset of the partition relatively to the parent offset
+ * @size: partition size. Should be equal to mtd->size unless
+ * MTD_SLC_ON_MLC_EMULATION is set
* @flags: original flags (before the mtdpart logic decided to tweak them based
* on flash constraints, like eraseblock/pagesize alignment)
*
@@ -209,6 +211,7 @@ struct mtd_debug_info {
struct mtd_part {
struct list_head node;
u64 offset;
+ u64 size;
u32 flags;
};
@@ -622,7 +625,9 @@ static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
{
- return mtd->erasesize / mtd->writesize;
+ struct mtd_info *master = mtd_get_master(mtd);
+
+ return master->erasesize / mtd->writesize;
}
static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index e545c050d3e8..b74a539ec581 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -37,6 +37,7 @@
* master MTD flag set for the corresponding MTD partition.
* For example, to force a read-only partition, simply adding
* MTD_WRITEABLE to the mask_flags will do the trick.
+ * add_flags: contains flags to add to the parent flags
*
* Note: writeable partitions require their size and offset be
* erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
@@ -48,6 +49,7 @@ struct mtd_partition {
uint64_t size; /* partition size */
uint64_t offset; /* offset within the master MTD space */
uint32_t mask_flags; /* master MTD flags to mask out for this partition */
+ uint32_t add_flags; /* flags to add to the partition */
struct device_node *of_node;
};
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index 47ffe3208c27..4b48fbf7d343 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -104,6 +104,7 @@ struct mtd_write_req {
#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
#define MTD_NO_ERASE 0x1000 /* No erase necessary */
#define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
+#define MTD_SLC_ON_MLC_EMULATION 0x4000 /* Emulate SLC behavior on MLC NANDs */
/* Some common devices / combinations of capabilities */
#define MTD_CAP_ROM 0
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 13:16:04 +0000