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![Simon Glass](/assets/img/avatar_default.png)
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
975 lines
23 KiB
C
975 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* MTD device concatenation layer
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*
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* Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
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* Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* NAND support by Christian Gan <cgan@iders.ca>
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*
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*/
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#ifndef __UBOOT__
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#include <log.h>
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#include <dm/devres.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/backing-dev.h>
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#include <asm/div64.h>
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#else
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#include <div64.h>
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#include <linux/bug.h>
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#include <linux/compat.h>
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#endif
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/concat.h>
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#include <ubi_uboot.h>
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/*
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* Our storage structure:
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* Subdev points to an array of pointers to struct mtd_info objects
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* which is allocated along with this structure
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*
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*/
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struct mtd_concat {
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struct mtd_info mtd;
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int num_subdev;
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struct mtd_info **subdev;
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};
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/*
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* how to calculate the size required for the above structure,
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* including the pointer array subdev points to:
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*/
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#define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \
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((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *)))
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/*
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* Given a pointer to the MTD object in the mtd_concat structure,
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* we can retrieve the pointer to that structure with this macro.
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*/
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#define CONCAT(x) ((struct mtd_concat *)(x))
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/*
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* MTD methods which look up the relevant subdevice, translate the
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* effective address and pass through to the subdevice.
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*/
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static int
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concat_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_concat *concat = CONCAT(mtd);
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int ret = 0, err;
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int i;
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#ifdef __UBOOT__
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*retlen = 0;
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#endif
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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size_t size, retsize;
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if (from >= subdev->size) {
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/* Not destined for this subdev */
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size = 0;
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from -= subdev->size;
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continue;
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}
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if (from + len > subdev->size)
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/* First part goes into this subdev */
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size = subdev->size - from;
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else
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/* Entire transaction goes into this subdev */
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size = len;
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err = mtd_read(subdev, from, size, &retsize, buf);
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/* Save information about bitflips! */
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if (unlikely(err)) {
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if (mtd_is_eccerr(err)) {
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mtd->ecc_stats.failed++;
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ret = err;
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} else if (mtd_is_bitflip(err)) {
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mtd->ecc_stats.corrected++;
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/* Do not overwrite -EBADMSG !! */
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if (!ret)
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ret = err;
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} else
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return err;
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}
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*retlen += retsize;
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len -= size;
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if (len == 0)
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return ret;
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buf += size;
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from = 0;
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}
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return -EINVAL;
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}
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static int
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concat_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_concat *concat = CONCAT(mtd);
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int err = -EINVAL;
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int i;
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#ifdef __UBOOT__
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*retlen = 0;
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#endif
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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size_t size, retsize;
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if (to >= subdev->size) {
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size = 0;
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to -= subdev->size;
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continue;
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}
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if (to + len > subdev->size)
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size = subdev->size - to;
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else
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size = len;
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err = mtd_write(subdev, to, size, &retsize, buf);
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if (err)
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break;
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*retlen += retsize;
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len -= size;
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if (len == 0)
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break;
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err = -EINVAL;
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buf += size;
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to = 0;
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}
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return err;
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}
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#ifndef __UBOOT__
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static int
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concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t * retlen)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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struct kvec *vecs_copy;
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unsigned long entry_low, entry_high;
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size_t total_len = 0;
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int i;
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int err = -EINVAL;
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/* Calculate total length of data */
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for (i = 0; i < count; i++)
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total_len += vecs[i].iov_len;
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/* Check alignment */
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if (mtd->writesize > 1) {
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uint64_t __to = to;
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if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
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return -EINVAL;
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}
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/* make a copy of vecs */
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vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
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if (!vecs_copy)
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return -ENOMEM;
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entry_low = 0;
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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size_t size, wsize, retsize, old_iov_len;
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if (to >= subdev->size) {
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to -= subdev->size;
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continue;
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}
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size = min_t(uint64_t, total_len, subdev->size - to);
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wsize = size; /* store for future use */
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entry_high = entry_low;
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while (entry_high < count) {
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if (size <= vecs_copy[entry_high].iov_len)
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break;
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size -= vecs_copy[entry_high++].iov_len;
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}
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old_iov_len = vecs_copy[entry_high].iov_len;
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vecs_copy[entry_high].iov_len = size;
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err = mtd_writev(subdev, &vecs_copy[entry_low],
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entry_high - entry_low + 1, to, &retsize);
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vecs_copy[entry_high].iov_len = old_iov_len - size;
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vecs_copy[entry_high].iov_base += size;
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entry_low = entry_high;
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if (err)
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break;
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*retlen += retsize;
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total_len -= wsize;
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if (total_len == 0)
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break;
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err = -EINVAL;
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to = 0;
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}
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kfree(vecs_copy);
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return err;
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}
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#endif
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static int
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concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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struct mtd_oob_ops devops = *ops;
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int i, err, ret = 0;
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ops->retlen = ops->oobretlen = 0;
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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if (from >= subdev->size) {
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from -= subdev->size;
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continue;
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}
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/* partial read ? */
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if (from + devops.len > subdev->size)
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devops.len = subdev->size - from;
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err = mtd_read_oob(subdev, from, &devops);
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ops->retlen += devops.retlen;
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ops->oobretlen += devops.oobretlen;
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/* Save information about bitflips! */
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if (unlikely(err)) {
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if (mtd_is_eccerr(err)) {
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mtd->ecc_stats.failed++;
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ret = err;
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} else if (mtd_is_bitflip(err)) {
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mtd->ecc_stats.corrected++;
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/* Do not overwrite -EBADMSG !! */
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if (!ret)
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ret = err;
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} else
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return err;
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}
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if (devops.datbuf) {
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devops.len = ops->len - ops->retlen;
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if (!devops.len)
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return ret;
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devops.datbuf += devops.retlen;
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}
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if (devops.oobbuf) {
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devops.ooblen = ops->ooblen - ops->oobretlen;
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if (!devops.ooblen)
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return ret;
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devops.oobbuf += ops->oobretlen;
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}
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from = 0;
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}
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return -EINVAL;
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}
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static int
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concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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struct mtd_oob_ops devops = *ops;
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int i, err;
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if (!(mtd->flags & MTD_WRITEABLE))
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return -EROFS;
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ops->retlen = ops->oobretlen = 0;
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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if (to >= subdev->size) {
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to -= subdev->size;
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continue;
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}
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/* partial write ? */
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if (to + devops.len > subdev->size)
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devops.len = subdev->size - to;
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err = mtd_write_oob(subdev, to, &devops);
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ops->retlen += devops.oobretlen;
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if (err)
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return err;
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if (devops.datbuf) {
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devops.len = ops->len - ops->retlen;
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if (!devops.len)
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return 0;
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devops.datbuf += devops.retlen;
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}
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if (devops.oobbuf) {
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devops.ooblen = ops->ooblen - ops->oobretlen;
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if (!devops.ooblen)
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return 0;
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devops.oobbuf += devops.oobretlen;
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}
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to = 0;
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}
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return -EINVAL;
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}
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static void concat_erase_callback(struct erase_info *instr)
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{
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/* Nothing to do here in U-Boot */
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#ifndef __UBOOT__
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wake_up((wait_queue_head_t *) instr->priv);
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#endif
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}
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static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase)
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{
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int err;
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wait_queue_head_t waitq;
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DECLARE_WAITQUEUE(wait, current);
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/*
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* This code was stol^H^H^H^Hinspired by mtdchar.c
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*/
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init_waitqueue_head(&waitq);
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erase->mtd = mtd;
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erase->callback = concat_erase_callback;
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erase->priv = (unsigned long) &waitq;
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/*
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* FIXME: Allow INTERRUPTIBLE. Which means
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* not having the wait_queue head on the stack.
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*/
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err = mtd_erase(mtd, erase);
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if (!err) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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add_wait_queue(&waitq, &wait);
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if (erase->state != MTD_ERASE_DONE
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&& erase->state != MTD_ERASE_FAILED)
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schedule();
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remove_wait_queue(&waitq, &wait);
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set_current_state(TASK_RUNNING);
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err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0;
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}
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return err;
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}
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static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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struct mtd_info *subdev;
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int i, err;
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uint64_t length, offset = 0;
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struct erase_info *erase;
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/*
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* Check for proper erase block alignment of the to-be-erased area.
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* It is easier to do this based on the super device's erase
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* region info rather than looking at each particular sub-device
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* in turn.
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*/
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if (!concat->mtd.numeraseregions) {
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/* the easy case: device has uniform erase block size */
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if (instr->addr & (concat->mtd.erasesize - 1))
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return -EINVAL;
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if (instr->len & (concat->mtd.erasesize - 1))
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return -EINVAL;
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} else {
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/* device has variable erase size */
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struct mtd_erase_region_info *erase_regions =
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concat->mtd.eraseregions;
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/*
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* Find the erase region where the to-be-erased area begins:
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*/
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for (i = 0; i < concat->mtd.numeraseregions &&
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instr->addr >= erase_regions[i].offset; i++) ;
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--i;
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/*
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* Now erase_regions[i] is the region in which the
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* to-be-erased area begins. Verify that the starting
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* offset is aligned to this region's erase size:
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*/
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if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
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return -EINVAL;
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/*
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* now find the erase region where the to-be-erased area ends:
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*/
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for (; i < concat->mtd.numeraseregions &&
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(instr->addr + instr->len) >= erase_regions[i].offset;
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++i) ;
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--i;
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/*
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* check if the ending offset is aligned to this region's erase size
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*/
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if (i < 0 || ((instr->addr + instr->len) &
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(erase_regions[i].erasesize - 1)))
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return -EINVAL;
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}
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/* make a local copy of instr to avoid modifying the caller's struct */
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erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
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if (!erase)
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return -ENOMEM;
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*erase = *instr;
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length = instr->len;
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/*
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* find the subdevice where the to-be-erased area begins, adjust
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* starting offset to be relative to the subdevice start
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*/
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for (i = 0; i < concat->num_subdev; i++) {
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subdev = concat->subdev[i];
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if (subdev->size <= erase->addr) {
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erase->addr -= subdev->size;
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offset += subdev->size;
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} else {
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break;
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}
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}
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/* must never happen since size limit has been verified above */
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BUG_ON(i >= concat->num_subdev);
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/* now do the erase: */
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err = 0;
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for (; length > 0; i++) {
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/* loop for all subdevices affected by this request */
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subdev = concat->subdev[i]; /* get current subdevice */
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/* limit length to subdevice's size: */
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if (erase->addr + length > subdev->size)
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erase->len = subdev->size - erase->addr;
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else
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erase->len = length;
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length -= erase->len;
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if ((err = concat_dev_erase(subdev, erase))) {
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/* sanity check: should never happen since
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* block alignment has been checked above */
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BUG_ON(err == -EINVAL);
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if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr = erase->fail_addr + offset;
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break;
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}
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/*
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* erase->addr specifies the offset of the area to be
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* erased *within the current subdevice*. It can be
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* non-zero only the first time through this loop, i.e.
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* for the first subdevice where blocks need to be erased.
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* All the following erases must begin at the start of the
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* current subdevice, i.e. at offset zero.
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*/
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erase->addr = 0;
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offset += subdev->size;
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}
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instr->state = erase->state;
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kfree(erase);
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if (err)
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return err;
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if (instr->callback)
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instr->callback(instr);
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return 0;
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}
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static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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int i, err = -EINVAL;
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for (i = 0; i < concat->num_subdev; i++) {
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struct mtd_info *subdev = concat->subdev[i];
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uint64_t size;
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if (ofs >= subdev->size) {
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size = 0;
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ofs -= subdev->size;
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continue;
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}
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if (ofs + len > subdev->size)
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size = subdev->size - ofs;
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else
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size = len;
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err = mtd_lock(subdev, ofs, size);
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if (err)
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break;
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len -= size;
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if (len == 0)
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break;
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err = -EINVAL;
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ofs = 0;
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}
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return err;
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}
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static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_concat *concat = CONCAT(mtd);
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int i, err = 0;
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|
|
for (i = 0; i < concat->num_subdev; i++) {
|
|
struct mtd_info *subdev = concat->subdev[i];
|
|
uint64_t size;
|
|
|
|
if (ofs >= subdev->size) {
|
|
size = 0;
|
|
ofs -= subdev->size;
|
|
continue;
|
|
}
|
|
if (ofs + len > subdev->size)
|
|
size = subdev->size - ofs;
|
|
else
|
|
size = len;
|
|
|
|
err = mtd_unlock(subdev, ofs, size);
|
|
if (err)
|
|
break;
|
|
|
|
len -= size;
|
|
if (len == 0)
|
|
break;
|
|
|
|
err = -EINVAL;
|
|
ofs = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void concat_sync(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_sync(subdev);
|
|
}
|
|
}
|
|
|
|
#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);
|
|
int i, res = 0;
|
|
|
|
if (!mtd_can_have_bb(concat->subdev[0]))
|
|
return res;
|
|
|
|
for (i = 0; i < concat->num_subdev; i++) {
|
|
struct mtd_info *subdev = concat->subdev[i];
|
|
|
|
if (ofs >= subdev->size) {
|
|
ofs -= subdev->size;
|
|
continue;
|
|
}
|
|
|
|
res = mtd_block_isbad(subdev, ofs);
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
struct mtd_concat *concat = CONCAT(mtd);
|
|
int i, err = -EINVAL;
|
|
|
|
for (i = 0; i < concat->num_subdev; i++) {
|
|
struct mtd_info *subdev = concat->subdev[i];
|
|
|
|
if (ofs >= subdev->size) {
|
|
ofs -= subdev->size;
|
|
continue;
|
|
}
|
|
|
|
err = mtd_block_markbad(subdev, ofs);
|
|
if (!err)
|
|
mtd->ecc_stats.badblocks++;
|
|
break;
|
|
}
|
|
|
|
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
|
|
* stored to *new_dev upon success. This function does _not_
|
|
* register any devices: this is the caller's responsibility.
|
|
*/
|
|
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++)
|
|
printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name);
|
|
debug("into device \"%s\"\n", name);
|
|
|
|
/* allocate the device structure */
|
|
size = SIZEOF_STRUCT_MTD_CONCAT(num_devs);
|
|
concat = kzalloc(size, GFP_KERNEL);
|
|
if (!concat) {
|
|
printk
|
|
("memory allocation error while creating concatenated device \"%s\"\n",
|
|
name);
|
|
return NULL;
|
|
}
|
|
concat->subdev = (struct mtd_info **) (concat + 1);
|
|
|
|
/*
|
|
* Set up the new "super" device's MTD object structure, check for
|
|
* 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._write_oob = concat_write_oob;
|
|
if (subdev[0]->_block_isbad)
|
|
concat->mtd._block_isbad = concat_block_isbad;
|
|
if (subdev[0]->_block_markbad)
|
|
concat->mtd._block_markbad = concat_block_markbad;
|
|
|
|
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++) {
|
|
if (concat->mtd.type != subdev[i]->type) {
|
|
kfree(concat);
|
|
printk("Incompatible device type on \"%s\"\n",
|
|
subdev[i]->name);
|
|
return NULL;
|
|
}
|
|
if (concat->mtd.flags != subdev[i]->flags) {
|
|
/*
|
|
* Expect all flags except MTD_WRITEABLE to be
|
|
* equal on all subdevices.
|
|
*/
|
|
if ((concat->mtd.flags ^ subdev[i]->
|
|
flags) & ~MTD_WRITEABLE) {
|
|
kfree(concat);
|
|
printk("Incompatible device flags on \"%s\"\n",
|
|
subdev[i]->name);
|
|
return NULL;
|
|
} else
|
|
/* if writeable attribute differs,
|
|
make super device writeable */
|
|
concat->mtd.flags |=
|
|
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;
|
|
if (concat->mtd.writesize != subdev[i]->writesize ||
|
|
concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
|
|
concat->mtd.oobsize != subdev[i]->oobsize ||
|
|
!concat->mtd._read_oob != !subdev[i]->_read_oob ||
|
|
!concat->mtd._write_oob != !subdev[i]->_write_oob) {
|
|
kfree(concat);
|
|
printk("Incompatible OOB or ECC data on \"%s\"\n",
|
|
subdev[i]->name);
|
|
return NULL;
|
|
}
|
|
concat->subdev[i] = subdev[i];
|
|
|
|
}
|
|
|
|
concat->mtd.ecclayout = subdev[0]->ecclayout;
|
|
|
|
concat->num_subdev = num_devs;
|
|
concat->mtd.name = name;
|
|
|
|
concat->mtd._erase = concat_erase;
|
|
concat->mtd._read = concat_read;
|
|
concat->mtd._write = concat_write;
|
|
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:
|
|
*
|
|
* first, walk the map of the new device and see how
|
|
* many changes in erase size we have
|
|
*/
|
|
max_erasesize = curr_erasesize = subdev[0]->erasesize;
|
|
num_erase_region = 1;
|
|
for (i = 0; i < num_devs; i++) {
|
|
if (subdev[i]->numeraseregions == 0) {
|
|
/* current subdevice has uniform erase size */
|
|
if (subdev[i]->erasesize != curr_erasesize) {
|
|
/* if it differs from the last subdevice's erase size, count it */
|
|
++num_erase_region;
|
|
curr_erasesize = subdev[i]->erasesize;
|
|
if (curr_erasesize > max_erasesize)
|
|
max_erasesize = curr_erasesize;
|
|
}
|
|
} else {
|
|
/* current subdevice has variable erase size */
|
|
int j;
|
|
for (j = 0; j < subdev[i]->numeraseregions; j++) {
|
|
|
|
/* walk the list of erase regions, count any changes */
|
|
if (subdev[i]->eraseregions[j].erasesize !=
|
|
curr_erasesize) {
|
|
++num_erase_region;
|
|
curr_erasesize =
|
|
subdev[i]->eraseregions[j].
|
|
erasesize;
|
|
if (curr_erasesize > max_erasesize)
|
|
max_erasesize = curr_erasesize;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (num_erase_region == 1) {
|
|
/*
|
|
* All subdevices have the same uniform erase size.
|
|
* This is easy:
|
|
*/
|
|
concat->mtd.erasesize = curr_erasesize;
|
|
concat->mtd.numeraseregions = 0;
|
|
} else {
|
|
uint64_t tmp64;
|
|
|
|
/*
|
|
* erase block size varies across the subdevices: allocate
|
|
* space to store the data describing the variable erase regions
|
|
*/
|
|
struct mtd_erase_region_info *erase_region_p;
|
|
uint64_t begin, position;
|
|
|
|
concat->mtd.erasesize = max_erasesize;
|
|
concat->mtd.numeraseregions = num_erase_region;
|
|
concat->mtd.eraseregions = erase_region_p =
|
|
kmalloc(num_erase_region *
|
|
sizeof (struct mtd_erase_region_info), GFP_KERNEL);
|
|
if (!erase_region_p) {
|
|
kfree(concat);
|
|
printk
|
|
("memory allocation error while creating erase region list"
|
|
" for device \"%s\"\n", name);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* walk the map of the new device once more and fill in
|
|
* in erase region info:
|
|
*/
|
|
curr_erasesize = subdev[0]->erasesize;
|
|
begin = position = 0;
|
|
for (i = 0; i < num_devs; i++) {
|
|
if (subdev[i]->numeraseregions == 0) {
|
|
/* current subdevice has uniform erase size */
|
|
if (subdev[i]->erasesize != curr_erasesize) {
|
|
/*
|
|
* fill in an mtd_erase_region_info structure for the area
|
|
* we have walked so far:
|
|
*/
|
|
erase_region_p->offset = begin;
|
|
erase_region_p->erasesize =
|
|
curr_erasesize;
|
|
tmp64 = position - begin;
|
|
do_div(tmp64, curr_erasesize);
|
|
erase_region_p->numblocks = tmp64;
|
|
begin = position;
|
|
|
|
curr_erasesize = subdev[i]->erasesize;
|
|
++erase_region_p;
|
|
}
|
|
position += subdev[i]->size;
|
|
} else {
|
|
/* current subdevice has variable erase size */
|
|
int j;
|
|
for (j = 0; j < subdev[i]->numeraseregions; j++) {
|
|
/* walk the list of erase regions, count any changes */
|
|
if (subdev[i]->eraseregions[j].
|
|
erasesize != curr_erasesize) {
|
|
erase_region_p->offset = begin;
|
|
erase_region_p->erasesize =
|
|
curr_erasesize;
|
|
tmp64 = position - begin;
|
|
do_div(tmp64, curr_erasesize);
|
|
erase_region_p->numblocks = tmp64;
|
|
begin = position;
|
|
|
|
curr_erasesize =
|
|
subdev[i]->eraseregions[j].
|
|
erasesize;
|
|
++erase_region_p;
|
|
}
|
|
position +=
|
|
subdev[i]->eraseregions[j].
|
|
numblocks * (uint64_t)curr_erasesize;
|
|
}
|
|
}
|
|
}
|
|
/* Now write the final entry */
|
|
erase_region_p->offset = begin;
|
|
erase_region_p->erasesize = curr_erasesize;
|
|
tmp64 = position - begin;
|
|
do_div(tmp64, curr_erasesize);
|
|
erase_region_p->numblocks = tmp64;
|
|
}
|
|
|
|
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");
|