11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MTD device concatenation layer 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de> 5a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org> 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NAND support by Christian Gan <cgan@iders.ca> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 9a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * This program is free software; you can redistribute it and/or modify 10a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * it under the terms of the GNU General Public License as published by 11a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * the Free Software Foundation; either version 2 of the License, or 12a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * (at your option) any later version. 13a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * 14a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * This program is distributed in the hope that it will be useful, 15a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * but WITHOUT ANY WARRANTY; without even the implied warranty of 16a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * GNU General Public License for more details. 18a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * 19a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * You should have received a copy of the GNU General Public License 20a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * along with this program; if not, write to the Free Software 21a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 22a1452a3771c4eb85bd779790b040efdc36f4274eDavid Woodhouse * 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 2615fdc52f35b853e3fa550087987b5ee4ffbd199bThomas Gleixner#include <linux/module.h> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 2815fdc52f35b853e3fa550087987b5ee4ffbd199bThomas Gleixner#include <linux/sched.h> 2915fdc52f35b853e3fa550087987b5ee4ffbd199bThomas Gleixner#include <linux/types.h> 306e232cfce35a20a8702d9ac7709d35030c1b3271David Howells#include <linux/backing-dev.h> 3115fdc52f35b853e3fa550087987b5ee4ffbd199bThomas Gleixner 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/mtd.h> 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/concat.h> 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 356c8b44abc86a3e23dd1a22c0ee187f06bd7c7f5dAndrew Morton#include <asm/div64.h> 366c8b44abc86a3e23dd1a22c0ee187f06bd7c7f5dAndrew Morton 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Our storage structure: 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Subdev points to an array of pointers to struct mtd_info objects 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * which is allocated along with this structure 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct mtd_concat { 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info mtd; 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int num_subdev; 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info **subdev; 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * how to calculate the size required for the above structure, 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * including the pointer array subdev points to: 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Given a pointer to the MTD object in the mtd_concat structure, 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * we can retrieve the pointer to that structure with this macro. 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define CONCAT(x) ((struct mtd_concat *)(x)) 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6297894cda5773e59bd13e87b72077751099419a9fThomas Gleixner/* 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MTD methods which look up the relevant subdevice, translate the 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * effective address and pass through to the subdevice. 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconcat_read(struct mtd_info *mtd, loff_t from, size_t len, 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t * retlen, u_char * buf) 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 72f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner int ret = 0, err; 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t size, retsize; 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (from >= subdev->size) { 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Not destined for this subdev */ 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = 0; 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from -= subdev->size; 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (from + len > subdev->size) 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* First part goes into this subdev */ 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = subdev->size - from; 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Entire transaction goes into this subdev */ 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = len; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 92329ad399a9b3adf52c90637b21ca029fcf7f8795Artem Bityutskiy err = mtd_read(subdev, from, size, &retsize, buf); 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 949a1fcdfd4bee27c418424cac47abf7c049541297Thomas Gleixner /* Save information about bitflips! */ 95f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner if (unlikely(err)) { 96d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris if (mtd_is_eccerr(err)) { 97f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.failed++; 989a1fcdfd4bee27c418424cac47abf7c049541297Thomas Gleixner ret = err; 99d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris } else if (mtd_is_bitflip(err)) { 100f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.corrected++; 101f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner /* Do not overwrite -EBADMSG !! */ 102f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner if (!ret) 103f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner ret = err; 104f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner } else 105f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner return err; 1069a1fcdfd4bee27c418424cac47abf7c049541297Thomas Gleixner } 1079a1fcdfd4bee27c418424cac47abf7c049541297Thomas Gleixner 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *retlen += retsize; 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= size; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len == 0) 111f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner return ret; 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf += size; 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from = 0; 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 116f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner return -EINVAL; 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconcat_write(struct mtd_info *mtd, loff_t to, size_t len, 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t * retlen, const u_char * buf) 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err = -EINVAL; 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t size, retsize; 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (to >= subdev->size) { 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = 0; 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to -= subdev->size; 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (to + len > subdev->size) 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = subdev->size - to; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = len; 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 141664addc248d2fed68d013d26ff2fc796d7134259Artem Bityutskiy err = mtd_write(subdev, to, size, &retsize, buf); 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *retlen += retsize; 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= size; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len == 0) 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = -EINVAL; 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf += size; 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to = 0; 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1589d8522df37f91621a70c5c0dbbf5bf2220b16798Thomas Gleixnerconcat_writev(struct mtd_info *mtd, const struct kvec *vecs, 1599d8522df37f91621a70c5c0dbbf5bf2220b16798Thomas Gleixner unsigned long count, loff_t to, size_t * retlen) 160e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov{ 161e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd); 162e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct kvec *vecs_copy; 163e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov unsigned long entry_low, entry_high; 164e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov size_t total_len = 0; 165e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov int i; 166e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov int err = -EINVAL; 167e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 168e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov /* Calculate total length of data */ 169e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov for (i = 0; i < count; i++) 170e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov total_len += vecs[i].iov_len; 171e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 172e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov /* Check alignment */ 17328318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel if (mtd->writesize > 1) { 1740bf9733d0d65ebb413d62204ad8e328e0a0b9407David Woodhouse uint64_t __to = to; 17528318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) 176e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return -EINVAL; 1776c8b44abc86a3e23dd1a22c0ee187f06bd7c7f5dAndrew Morton } 178e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 179e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov /* make a copy of vecs */ 180d80f2666b5373f195deae57c9f33a5abb8053d37Julia Lawall vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL); 181e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (!vecs_copy) 182e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return -ENOMEM; 183e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 184e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov entry_low = 0; 185e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) { 186e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_info *subdev = concat->subdev[i]; 187e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov size_t size, wsize, retsize, old_iov_len; 188e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 189e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (to >= subdev->size) { 190e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov to -= subdev->size; 191e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov continue; 192e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 193e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 19469423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter size = min_t(uint64_t, total_len, subdev->size - to); 195e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov wsize = size; /* store for future use */ 196e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 197e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov entry_high = entry_low; 198e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov while (entry_high < count) { 199e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (size <= vecs_copy[entry_high].iov_len) 200e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov break; 201e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov size -= vecs_copy[entry_high++].iov_len; 202e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 203e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 204e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov old_iov_len = vecs_copy[entry_high].iov_len; 205e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov vecs_copy[entry_high].iov_len = size; 206e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 207664addc248d2fed68d013d26ff2fc796d7134259Artem Bityutskiy err = mtd_writev(subdev, &vecs_copy[entry_low], 208664addc248d2fed68d013d26ff2fc796d7134259Artem Bityutskiy entry_high - entry_low + 1, to, &retsize); 209e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 210e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov vecs_copy[entry_high].iov_len = old_iov_len - size; 211e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov vecs_copy[entry_high].iov_base += size; 212e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 213e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov entry_low = entry_high; 214e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 215e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (err) 216e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov break; 217e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 218e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov *retlen += retsize; 219e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov total_len -= wsize; 220e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 221e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (total_len == 0) 222e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov break; 223e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 224e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov err = -EINVAL; 225e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov to = 0; 226e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 227e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 228e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov kfree(vecs_copy); 229e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return err; 230e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov} 231e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 232e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakovstatic int 2338593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerconcat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 2368593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops devops = *ops; 237f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner int i, err, ret = 0; 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2397014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool ops->retlen = ops->oobretlen = 0; 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (from >= subdev->size) { 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from -= subdev->size; 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2498593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner /* partial read ? */ 2508593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (from + devops.len > subdev->size) 2518593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner devops.len = subdev->size - from; 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 253fd2819bbc92fc98bed5d612e4acbe16b6326f6bfArtem Bityutskiy err = mtd_read_oob(subdev, from, &devops); 2548593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops->retlen += devops.retlen; 2557014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool ops->oobretlen += devops.oobretlen; 256f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner 257f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner /* Save information about bitflips! */ 258f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner if (unlikely(err)) { 259d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris if (mtd_is_eccerr(err)) { 260f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.failed++; 261f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner ret = err; 262d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris } else if (mtd_is_bitflip(err)) { 263f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.corrected++; 264f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner /* Do not overwrite -EBADMSG !! */ 265f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner if (!ret) 266f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner ret = err; 267f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner } else 268f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner return err; 269f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner } 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2717014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (devops.datbuf) { 2727014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.len = ops->len - ops->retlen; 2737014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (!devops.len) 2747014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool return ret; 2758593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner devops.datbuf += devops.retlen; 2767014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool } 2777014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (devops.oobbuf) { 2787014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.ooblen = ops->ooblen - ops->oobretlen; 2797014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (!devops.ooblen) 2807014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool return ret; 2817014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.oobbuf += ops->oobretlen; 2827014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool } 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from = 0; 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2868593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return -EINVAL; 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 2908593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerconcat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 2938593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops devops = *ops; 2948593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int i, err; 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(mtd->flags & MTD_WRITEABLE)) 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EROFS; 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 299431e1ecabddcd7cbba237182ddf431771f98bb4cFelix Radensky ops->retlen = ops->oobretlen = 0; 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (to >= subdev->size) { 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to -= subdev->size; 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3098593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner /* partial write ? */ 3108593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (to + devops.len > subdev->size) 3118593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner devops.len = subdev->size - to; 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 313a2cc5ba075f9bc837d0b4d4ec7328dcefc11859dArtem Bityutskiy err = mtd_write_oob(subdev, to, &devops); 314431e1ecabddcd7cbba237182ddf431771f98bb4cFelix Radensky ops->retlen += devops.oobretlen; 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) 3168593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return err; 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3187014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (devops.datbuf) { 3197014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.len = ops->len - ops->retlen; 3207014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (!devops.len) 3217014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool return 0; 3228593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner devops.datbuf += devops.retlen; 3237014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool } 3247014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (devops.oobbuf) { 3257014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.ooblen = ops->ooblen - ops->oobretlen; 3267014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (!devops.ooblen) 3277014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool return 0; 3287014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool devops.oobbuf += devops.oobretlen; 3297014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool } 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to = 0; 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3328593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return -EINVAL; 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void concat_erase_callback(struct erase_info *instr) 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wake_up((wait_queue_head_t *) instr->priv); 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err; 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wait_queue_head_t waitq; 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DECLARE_WAITQUEUE(wait, current); 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This code was stol^H^H^H^Hinspired by mtdchar.c 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds init_waitqueue_head(&waitq); 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->mtd = mtd; 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->callback = concat_erase_callback; 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->priv = (unsigned long) &waitq; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * FIXME: Allow INTERRUPTIBLE. Which means 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * not having the wait_queue head on the stack. 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3597e1f0dc0551b99acb5e8fa161a7ac401994d57d8Artem Bityutskiy err = mtd_erase(mtd, erase); 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!err) { 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_current_state(TASK_UNINTERRUPTIBLE); 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds add_wait_queue(&waitq, &wait); 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (erase->state != MTD_ERASE_DONE 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds && erase->state != MTD_ERASE_FAILED) 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds schedule(); 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds remove_wait_queue(&waitq, &wait); 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_current_state(TASK_RUNNING); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int concat_erase(struct mtd_info *mtd, struct erase_info *instr) 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev; 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, err; 37969423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter uint64_t length, offset = 0; 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct erase_info *erase; 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check for proper erase block alignment of the to-be-erased area. 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * It is easier to do this based on the super device's erase 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * region info rather than looking at each particular sub-device 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in turn. 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!concat->mtd.numeraseregions) { 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* the easy case: device has uniform erase block size */ 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (instr->addr & (concat->mtd.erasesize - 1)) 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (instr->len & (concat->mtd.erasesize - 1)) 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* device has variable erase size */ 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_erase_region_info *erase_regions = 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.eraseregions; 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Find the erase region where the to-be-erased area begins: 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->mtd.numeraseregions && 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instr->addr >= erase_regions[i].offset; i++) ; 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds --i; 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Now erase_regions[i] is the region in which the 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to-be-erased area begins. Verify that the starting 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * offset is aligned to this region's erase size: 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 411ebf2e93036907fe2a7ddab942aa63d35f97f3b2bRoel Kluin if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1)) 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * now find the erase region where the to-be-erased area ends: 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (; i < concat->mtd.numeraseregions && 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (instr->addr + instr->len) >= erase_regions[i].offset; 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ++i) ; 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds --i; 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * check if the ending offset is aligned to this region's erase size 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 424ebf2e93036907fe2a7ddab942aa63d35f97f3b2bRoel Kluin if (i < 0 || ((instr->addr + instr->len) & 425ebf2e93036907fe2a7ddab942aa63d35f97f3b2bRoel Kluin (erase_regions[i].erasesize - 1))) 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* make a local copy of instr to avoid modifying the caller's struct */ 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!erase) 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *erase = *instr; 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds length = instr->len; 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * find the subdevice where the to-be-erased area begins, adjust 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * starting offset to be relative to the subdevice start 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev = concat->subdev[i]; 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev->size <= erase->addr) { 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->addr -= subdev->size; 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset += subdev->size; 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* must never happen since size limit has been verified above */ 453373ebfbf17a8ecad304f65cb92c4d2d10adc0a19Eric Sesterhenn BUG_ON(i >= concat->num_subdev); 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* now do the erase: */ 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = 0; 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (; length > 0; i++) { 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* loop for all subdevices affected by this request */ 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev = concat->subdev[i]; /* get current subdevice */ 4601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* limit length to subdevice's size: */ 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (erase->addr + length > subdev->size) 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->len = subdev->size - erase->addr; 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->len = length; 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds length -= erase->len; 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((err = concat_dev_erase(subdev, erase))) { 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* sanity check: should never happen since 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * block alignment has been checked above */ 471373ebfbf17a8ecad304f65cb92c4d2d10adc0a19Eric Sesterhenn BUG_ON(err == -EINVAL); 472bb0eb217c980d50c45f3e793b4dcc70ab9ee820dAdrian Hunter if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instr->fail_addr = erase->fail_addr + offset; 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * erase->addr specifies the offset of the area to be 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * erased *within the current subdevice*. It can be 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * non-zero only the first time through this loop, i.e. 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for the first subdevice where blocks need to be erased. 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * All the following erases must begin at the start of the 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * current subdevice, i.e. at offset zero. 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase->addr = 0; 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset += subdev->size; 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instr->state = erase->state; 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(erase); 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (instr->callback) 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instr->callback(instr); 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 49769423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunterstatic int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, err = -EINVAL; 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 50469423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter uint64_t size; 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ofs >= subdev->size) { 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = 0; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ofs -= subdev->size; 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ofs + len > subdev->size) 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = subdev->size - ofs; 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = len; 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 516381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy err = mtd_lock(subdev, ofs, size); 517381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy if (err) 518381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy break; 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= size; 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len == 0) 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = -EINVAL; 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ofs = 0; 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 53169423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunterstatic int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, err = 0; 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 53869423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter uint64_t size; 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ofs >= subdev->size) { 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = 0; 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ofs -= subdev->size; 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ofs + len > subdev->size) 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = subdev->size - ofs; 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = len; 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 550381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy err = mtd_unlock(subdev, ofs, size); 551381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy if (err) 552381345652fca688aeaa967c231e5075cf68d05b6Artem Bityutskiy break; 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= size; 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len == 0) 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = -EINVAL; 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ofs = 0; 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void concat_sync(struct mtd_info *mtd) 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 57285f2f2a809d658c15b574df02ede92090f45a1f2Artem Bityutskiy mtd_sync(subdev); 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int concat_suspend(struct mtd_info *mtd) 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, rc = 0; 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 5833fe4bae88460869a8e553397cd9057a4ee7ca341Artem Bityutskiy if ((rc = mtd_suspend(subdev)) < 0) 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return rc; 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return rc; 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void concat_resume(struct mtd_info *mtd) 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < concat->num_subdev; i++) { 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_info *subdev = concat->subdev[i]; 596ead995f8d4da1e2f1ef40b0e5f4133fee38a3d3dArtem Bityutskiy mtd_resume(subdev); 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 600e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakovstatic int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) 601e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov{ 602e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd); 603e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov int i, res = 0; 604e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 6058f461a730242c528ca221948edceca49266a3ffbArtem Bityutskiy if (!mtd_can_have_bb(concat->subdev[0])) 606e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return res; 607e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 608e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) { 609e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_info *subdev = concat->subdev[i]; 610e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 611e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (ofs >= subdev->size) { 612e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov ofs -= subdev->size; 613e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov continue; 614e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 615e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 6167086c19d07429d697057587caf1e5e0345442d16Artem Bityutskiy res = mtd_block_isbad(subdev, ofs); 617e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov break; 618e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 619e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 620e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return res; 621e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov} 622e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 623e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakovstatic int concat_block_markbad(struct mtd_info *mtd, loff_t ofs) 624e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov{ 625e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd); 626e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov int i, err = -EINVAL; 627e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 628e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) { 629e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov struct mtd_info *subdev = concat->subdev[i]; 630e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 631e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov if (ofs >= subdev->size) { 632e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov ofs -= subdev->size; 633e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov continue; 634e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 635e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 6365942ddbc500d1c9b75e571b656be97f65b26adfeArtem Bityutskiy err = mtd_block_markbad(subdev, ofs); 637f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner if (!err) 638f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.badblocks++; 639e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov break; 640e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov } 641e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 642e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov return err; 643e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov} 644e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 6466e232cfce35a20a8702d9ac7709d35030c1b3271David Howells * try to support NOMMU mmaps on concatenated devices 6476e232cfce35a20a8702d9ac7709d35030c1b3271David Howells * - we don't support subdev spanning as we can't guarantee it'll work 6486e232cfce35a20a8702d9ac7709d35030c1b3271David Howells */ 6496e232cfce35a20a8702d9ac7709d35030c1b3271David Howellsstatic unsigned long concat_get_unmapped_area(struct mtd_info *mtd, 6506e232cfce35a20a8702d9ac7709d35030c1b3271David Howells unsigned long len, 6516e232cfce35a20a8702d9ac7709d35030c1b3271David Howells unsigned long offset, 6526e232cfce35a20a8702d9ac7709d35030c1b3271David Howells unsigned long flags) 6536e232cfce35a20a8702d9ac7709d35030c1b3271David Howells{ 6546e232cfce35a20a8702d9ac7709d35030c1b3271David Howells struct mtd_concat *concat = CONCAT(mtd); 6556e232cfce35a20a8702d9ac7709d35030c1b3271David Howells int i; 6566e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 6576e232cfce35a20a8702d9ac7709d35030c1b3271David Howells for (i = 0; i < concat->num_subdev; i++) { 6586e232cfce35a20a8702d9ac7709d35030c1b3271David Howells struct mtd_info *subdev = concat->subdev[i]; 6596e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 6606e232cfce35a20a8702d9ac7709d35030c1b3271David Howells if (offset >= subdev->size) { 6616e232cfce35a20a8702d9ac7709d35030c1b3271David Howells offset -= subdev->size; 6626e232cfce35a20a8702d9ac7709d35030c1b3271David Howells continue; 6636e232cfce35a20a8702d9ac7709d35030c1b3271David Howells } 6646e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 665cd621274b0ec747db8dedbf857624c067f481976Artem Bityutskiy return mtd_get_unmapped_area(subdev, len, offset, flags); 6666e232cfce35a20a8702d9ac7709d35030c1b3271David Howells } 6676e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 6686e232cfce35a20a8702d9ac7709d35030c1b3271David Howells return (unsigned long) -ENOSYS; 6696e232cfce35a20a8702d9ac7709d35030c1b3271David Howells} 6706e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 6716e232cfce35a20a8702d9ac7709d35030c1b3271David Howells/* 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This function constructs a virtual MTD device by concatenating 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * num_devs MTD devices. A pointer to the new device object is 6741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * stored to *new_dev upon success. This function does _not_ 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * register any devices: this is the caller's responsibility. 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int num_devs, /* number of subdevices */ 679160bbab3000dafccbe43688e48208cecf4deb879Kay Sievers const char *name) 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ /* name for the new device */ 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t size; 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat; 68426cdb67c74aedc22367e6d0271f7f955220cca65David Woodhouse uint32_t max_erasesize, curr_erasesize; 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int num_erase_region; 686771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck int max_writebufsize = 0; 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_NOTICE "Concatenating MTD devices:\n"); 6891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < num_devs; i++) 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_NOTICE "into device \"%s\"\n", name); 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* allocate the device structure */ 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); 69595b93a0cd46682c6d9e8eea803fda510cb6b863aBurman Yan concat = kzalloc(size, GFP_KERNEL); 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!concat) { 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ("memory allocation error while creating concatenated device \"%s\"\n", 6991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds name); 7001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->subdev = (struct mtd_info **) (concat + 1); 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Set up the new "super" device's MTD object structure, check for 70692394b5c2be774425f255b5c7afbd8b19978fe12Brian Norris * incompatibilities between the subdevices. 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.type = subdev[0]->type; 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.flags = subdev[0]->flags; 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.size = subdev[0]->size; 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.erasesize = subdev[0]->erasesize; 71228318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel concat->mtd.writesize = subdev[0]->writesize; 713771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck 714771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck for (i = 0; i < num_devs; i++) 715771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck if (max_writebufsize < subdev[i]->writebufsize) 716771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck max_writebufsize = subdev[i]->writebufsize; 717771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck concat->mtd.writebufsize = max_writebufsize; 718771df61949cf2d6ae9ff07e209c80693cdbc9302Holger Brunck 719a2e1b833d9e0231d67e722b7e2f4d79daf919bafChris Paulson-Ellis concat->mtd.subpage_sft = subdev[0]->subpage_sft; 7201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.oobsize = subdev[0]->oobsize; 7211f92267c51a514f35ad5b0fd46cb099c0980b679Vitaly Wool concat->mtd.oobavail = subdev[0]->oobavail; 7223c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy if (subdev[0]->_writev) 7233c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._writev = concat_writev; 7243c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy if (subdev[0]->_read_oob) 7253c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._read_oob = concat_read_oob; 7263c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy if (subdev[0]->_write_oob) 7273c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._write_oob = concat_write_oob; 7283c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy if (subdev[0]->_block_isbad) 7293c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._block_isbad = concat_block_isbad; 7303c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy if (subdev[0]->_block_markbad) 7313c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._block_markbad = concat_block_markbad; 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 733f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; 734f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner 7356e232cfce35a20a8702d9ac7709d35030c1b3271David Howells concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; 7366e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 7371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->subdev[0] = subdev[0]; 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 1; i < num_devs; i++) { 7401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (concat->mtd.type != subdev[i]->type) { 7411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat); 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("Incompatible device type on \"%s\"\n", 7431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->name); 7441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (concat->mtd.flags != subdev[i]->flags) { 7471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Expect all flags except MTD_WRITEABLE to be 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * equal on all subdevices. 7501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((concat->mtd.flags ^ subdev[i]-> 7521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flags) & ~MTD_WRITEABLE) { 7531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat); 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("Incompatible device flags on \"%s\"\n", 7551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->name); 7561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else 7581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* if writeable attribute differs, 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds make super device writeable */ 7601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.flags |= 7611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->flags & MTD_WRITEABLE; 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7636e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 7646e232cfce35a20a8702d9ac7709d35030c1b3271David Howells /* only permit direct mapping if the BDIs are all the same 7656e232cfce35a20a8702d9ac7709d35030c1b3271David Howells * - copy-mapping is still permitted 7666e232cfce35a20a8702d9ac7709d35030c1b3271David Howells */ 7676e232cfce35a20a8702d9ac7709d35030c1b3271David Howells if (concat->mtd.backing_dev_info != 7686e232cfce35a20a8702d9ac7709d35030c1b3271David Howells subdev[i]->backing_dev_info) 7696e232cfce35a20a8702d9ac7709d35030c1b3271David Howells concat->mtd.backing_dev_info = 7706e232cfce35a20a8702d9ac7709d35030c1b3271David Howells &default_backing_dev_info; 7716e232cfce35a20a8702d9ac7709d35030c1b3271David Howells 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.size += subdev[i]->size; 773f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner concat->mtd.ecc_stats.badblocks += 774f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner subdev[i]->ecc_stats.badblocks; 77528318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel if (concat->mtd.writesize != subdev[i]->writesize || 77629072b96078ffde36f03d51e6b5d0cff1ba8c7dfThomas Gleixner concat->mtd.subpage_sft != subdev[i]->subpage_sft || 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.oobsize != subdev[i]->oobsize || 7783c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy !concat->mtd._read_oob != !subdev[i]->_read_oob || 7793c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy !concat->mtd._write_oob != !subdev[i]->_write_oob) { 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat); 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("Incompatible OOB or ECC data on \"%s\"\n", 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->name); 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->subdev[i] = subdev[i]; 7861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7895bd34c091a044d130601370c370f84b1c59f1627Thomas Gleixner concat->mtd.ecclayout = subdev[0]->ecclayout; 790e8d32937d9f2022c31871ef357a4883f78da1b7fAlexander Belyakov 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->num_subdev = num_devs; 7921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.name = name; 7931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7943c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._erase = concat_erase; 7953c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._read = concat_read; 7963c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._write = concat_write; 7973c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._sync = concat_sync; 7983c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._lock = concat_lock; 7993c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._unlock = concat_unlock; 8003c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._suspend = concat_suspend; 8013c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._resume = concat_resume; 8023c3c10bba1e4ccb75b41442e45c1a072f6cded19Artem Bityutskiy concat->mtd._get_unmapped_area = concat_get_unmapped_area; 8031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Combine the erase block size info of the subdevices: 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * first, walk the map of the new device and see how 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * many changes in erase size we have 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds max_erasesize = curr_erasesize = subdev[0]->erasesize; 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds num_erase_region = 1; 8121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < num_devs; i++) { 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->numeraseregions == 0) { 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* current subdevice has uniform erase size */ 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->erasesize != curr_erasesize) { 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* if it differs from the last subdevice's erase size, count it */ 8171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ++num_erase_region; 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize = subdev[i]->erasesize; 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (curr_erasesize > max_erasesize) 8201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds max_erasesize = curr_erasesize; 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* current subdevice has variable erase size */ 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int j; 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (j = 0; j < subdev[i]->numeraseregions; j++) { 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* walk the list of erase regions, count any changes */ 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->eraseregions[j].erasesize != 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize) { 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ++num_erase_region; 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize = 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->eraseregions[j]. 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erasesize; 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (curr_erasesize > max_erasesize) 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds max_erasesize = curr_erasesize; 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (num_erase_region == 1) { 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * All subdevices have the same uniform erase size. 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This is easy: 8451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.erasesize = curr_erasesize; 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.numeraseregions = 0; 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 84969423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter uint64_t tmp64; 85069423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * erase block size varies across the subdevices: allocate 8531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * space to store the data describing the variable erase regions 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_erase_region_info *erase_region_p; 85669423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter uint64_t begin, position; 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.erasesize = max_erasesize; 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.numeraseregions = num_erase_region; 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concat->mtd.eraseregions = erase_region_p = 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kmalloc(num_erase_region * 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sizeof (struct mtd_erase_region_info), GFP_KERNEL); 8631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!erase_region_p) { 8641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat); 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ("memory allocation error while creating erase region list" 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds " for device \"%s\"\n", name); 8681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 8691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * walk the map of the new device once more and fill in 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in erase region info: 8741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize = subdev[0]->erasesize; 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds begin = position = 0; 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < num_devs; i++) { 8781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->numeraseregions == 0) { 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* current subdevice has uniform erase size */ 8801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->erasesize != curr_erasesize) { 8811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * fill in an mtd_erase_region_info structure for the area 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * we have walked so far: 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->offset = begin; 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->erasesize = 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize; 88869423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter tmp64 = position - begin; 88969423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter do_div(tmp64, curr_erasesize); 89069423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter erase_region_p->numblocks = tmp64; 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds begin = position; 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize = subdev[i]->erasesize; 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ++erase_region_p; 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds position += subdev[i]->size; 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* current subdevice has variable erase size */ 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int j; 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (j = 0; j < subdev[i]->numeraseregions; j++) { 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* walk the list of erase regions, count any changes */ 9021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (subdev[i]->eraseregions[j]. 9031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erasesize != curr_erasesize) { 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->offset = begin; 9051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->erasesize = 9061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize; 90769423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter tmp64 = position - begin; 90869423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter do_div(tmp64, curr_erasesize); 90969423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter erase_region_p->numblocks = tmp64; 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds begin = position; 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds curr_erasesize = 9131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->eraseregions[j]. 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erasesize; 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ++erase_region_p; 9161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds position += 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subdev[i]->eraseregions[j]. 91969423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter numblocks * (uint64_t)curr_erasesize; 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now write the final entry */ 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->offset = begin; 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds erase_region_p->erasesize = curr_erasesize; 92669423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter tmp64 = position - begin; 92769423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter do_div(tmp64, curr_erasesize); 92869423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter erase_region_p->numblocks = tmp64; 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return &concat->mtd; 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 93497894cda5773e59bd13e87b72077751099419a9fThomas Gleixner/* 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This function destroys an MTD object obtained from concat_mtd_devs() 9361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 9371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid mtd_concat_destroy(struct mtd_info *mtd) 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mtd_concat *concat = CONCAT(mtd); 9411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (concat->mtd.numeraseregions) 9421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat->mtd.eraseregions); 9431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(concat); 9441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(mtd_concat_create); 9471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(mtd_concat_destroy); 9481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 9501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); 9511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); 952