/*
* MTD device concatenation layer
*
- * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
*
* NAND support by Christian Gan <cgan@iders.ca>
*
- * This code is GPL
+ * SPDX-License-Identifier: GPL-2.0+
+ *
*/
-#include <linux/mtd/mtd.h>
+#define __UBOOT__
+#ifndef __UBOOT__
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/backing-dev.h>
+#include <asm/div64.h>
+#else
+#include <div64.h>
#include <linux/compat.h>
+#endif
+
+#include <linux/mtd/mtd.h>
#include <linux/mtd/concat.h>
+
#include <ubi_uboot.h>
/*
int ret = 0, err;
int i;
+#ifdef __UBOOT__
*retlen = 0;
+#endif
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
int err = -EINVAL;
int i;
+#ifdef __UBOOT__
*retlen = 0;
+#endif
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
return err;
}
+#ifndef __UBOOT__
+static int
+concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t * retlen)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ struct kvec *vecs_copy;
+ unsigned long entry_low, entry_high;
+ size_t total_len = 0;
+ int i;
+ int err = -EINVAL;
+
+ /* Calculate total length of data */
+ for (i = 0; i < count; i++)
+ total_len += vecs[i].iov_len;
+
+ /* Check alignment */
+ if (mtd->writesize > 1) {
+ uint64_t __to = to;
+ if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
+ return -EINVAL;
+ }
+
+ /* make a copy of vecs */
+ vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
+ if (!vecs_copy)
+ return -ENOMEM;
+
+ entry_low = 0;
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+ size_t size, wsize, retsize, old_iov_len;
+
+ if (to >= subdev->size) {
+ to -= subdev->size;
+ continue;
+ }
+
+ size = min_t(uint64_t, total_len, subdev->size - to);
+ wsize = size; /* store for future use */
+
+ entry_high = entry_low;
+ while (entry_high < count) {
+ if (size <= vecs_copy[entry_high].iov_len)
+ break;
+ size -= vecs_copy[entry_high++].iov_len;
+ }
+
+ old_iov_len = vecs_copy[entry_high].iov_len;
+ vecs_copy[entry_high].iov_len = size;
+
+ err = mtd_writev(subdev, &vecs_copy[entry_low],
+ entry_high - entry_low + 1, to, &retsize);
+
+ vecs_copy[entry_high].iov_len = old_iov_len - size;
+ vecs_copy[entry_high].iov_base += size;
+
+ entry_low = entry_high;
+
+ if (err)
+ break;
+
+ *retlen += retsize;
+ total_len -= wsize;
+
+ if (total_len == 0)
+ break;
+
+ err = -EINVAL;
+ to = 0;
+ }
+
+ kfree(vecs_copy);
+ return err;
+}
+#endif
+
static int
concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
{
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
- ops->retlen = 0;
+ ops->retlen = ops->oobretlen = 0;
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
devops.len = subdev->size - to;
err = mtd_write_oob(subdev, to, &devops);
- ops->retlen += devops.retlen;
+ ops->retlen += devops.oobretlen;
if (err)
return err;
static void concat_erase_callback(struct erase_info *instr)
{
/* Nothing to do here in U-Boot */
+#ifndef __UBOOT__
+ wake_up((wait_queue_head_t *) instr->priv);
+#endif
}
static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase)
* to-be-erased area begins. Verify that the starting
* offset is aligned to this region's erase size:
*/
- if (instr->addr & (erase_regions[i].erasesize - 1))
+ if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
return -EINVAL;
/*
/*
* check if the ending offset is aligned to this region's erase size
*/
- if ((instr->addr + instr->len) & (erase_regions[i].erasesize -
- 1))
+ if (i < 0 || ((instr->addr + instr->len) &
+ (erase_regions[i].erasesize - 1)))
return -EINVAL;
}
size = len;
err = mtd_lock(subdev, ofs, size);
-
if (err)
break;
size = len;
err = mtd_unlock(subdev, ofs, size);
-
if (err)
break;
}
}
+#ifndef __UBOOT__
+static int concat_suspend(struct mtd_info *mtd)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ int i, rc = 0;
+
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+ if ((rc = mtd_suspend(subdev)) < 0)
+ return rc;
+ }
+ return rc;
+}
+
+static void concat_resume(struct mtd_info *mtd)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ int i;
+
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+ mtd_resume(subdev);
+ }
+}
+#endif
+
static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_concat *concat = CONCAT(mtd);
struct mtd_concat *concat = CONCAT(mtd);
int i, err = -EINVAL;
- if (!mtd_can_have_bb(concat->subdev[0]))
- return 0;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
return err;
}
+/*
+ * try to support NOMMU mmaps on concatenated devices
+ * - we don't support subdev spanning as we can't guarantee it'll work
+ */
+static unsigned long concat_get_unmapped_area(struct mtd_info *mtd,
+ unsigned long len,
+ unsigned long offset,
+ unsigned long flags)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ int i;
+
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+
+ if (offset >= subdev->size) {
+ offset -= subdev->size;
+ continue;
+ }
+
+ return mtd_get_unmapped_area(subdev, len, offset, flags);
+ }
+
+ return (unsigned long) -ENOSYS;
+}
+
/*
* This function constructs a virtual MTD device by concatenating
* num_devs MTD devices. A pointer to the new device object is
*/
struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */
int num_devs, /* number of subdevices */
+#ifndef __UBOOT__
const char *name)
+#else
+ char *name)
+#endif
{ /* name for the new device */
int i;
size_t size;
struct mtd_concat *concat;
uint32_t max_erasesize, curr_erasesize;
int num_erase_region;
+ int max_writebufsize = 0;
debug("Concatenating MTD devices:\n");
for (i = 0; i < num_devs; i++)
- debug("(%d): \"%s\"\n", i, subdev[i]->name);
+ printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name);
debug("into device \"%s\"\n", name);
/* allocate the device structure */
/*
* Set up the new "super" device's MTD object structure, check for
- * incompatibilites between the subdevices.
+ * incompatibilities between the subdevices.
*/
concat->mtd.type = subdev[0]->type;
concat->mtd.flags = subdev[0]->flags;
concat->mtd.size = subdev[0]->size;
concat->mtd.erasesize = subdev[0]->erasesize;
concat->mtd.writesize = subdev[0]->writesize;
+
+ for (i = 0; i < num_devs; i++)
+ if (max_writebufsize < subdev[i]->writebufsize)
+ max_writebufsize = subdev[i]->writebufsize;
+ concat->mtd.writebufsize = max_writebufsize;
+
concat->mtd.subpage_sft = subdev[0]->subpage_sft;
concat->mtd.oobsize = subdev[0]->oobsize;
concat->mtd.oobavail = subdev[0]->oobavail;
+#ifndef __UBOOT__
+ if (subdev[0]->_writev)
+ concat->mtd._writev = concat_writev;
+#endif
if (subdev[0]->_read_oob)
concat->mtd._read_oob = concat_read_oob;
if (subdev[0]->_write_oob)
concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
+#ifndef __UBOOT__
+ concat->mtd.backing_dev_info = subdev[0]->backing_dev_info;
+#endif
+
concat->subdev[0] = subdev[0];
for (i = 1; i < num_devs; i++) {
subdev[i]->flags & MTD_WRITEABLE;
}
+#ifndef __UBOOT__
+ /* only permit direct mapping if the BDIs are all the same
+ * - copy-mapping is still permitted
+ */
+ if (concat->mtd.backing_dev_info !=
+ subdev[i]->backing_dev_info)
+ concat->mtd.backing_dev_info =
+ &default_backing_dev_info;
+#endif
+
concat->mtd.size += subdev[i]->size;
concat->mtd.ecc_stats.badblocks +=
subdev[i]->ecc_stats.badblocks;
concat->mtd._sync = concat_sync;
concat->mtd._lock = concat_lock;
concat->mtd._unlock = concat_unlock;
+#ifndef __UBOOT__
+ concat->mtd._suspend = concat_suspend;
+ concat->mtd._resume = concat_resume;
+#endif
+ concat->mtd._get_unmapped_area = concat_get_unmapped_area;
/*
* Combine the erase block size info of the subdevices:
return &concat->mtd;
}
+
+/*
+ * This function destroys an MTD object obtained from concat_mtd_devs()
+ */
+
+void mtd_concat_destroy(struct mtd_info *mtd)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ if (concat->mtd.numeraseregions)
+ kfree(concat->mtd.eraseregions);
+ kfree(concat);
+}
+
+EXPORT_SYMBOL(mtd_concat_create);
+EXPORT_SYMBOL(mtd_concat_destroy);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>");
+MODULE_DESCRIPTION("Generic support for concatenating of MTD devices");
projects / people / ms / u-boot.git / blobdiff