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   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Dominic Rath <Dominic.Rath@gmx.de>              *
   3  *   Copyright (C) 2002 Thomas Gleixner <tglx@linutronix.de>               *
   4  *   Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>             *
   5  *                                                                         *
   6  *   Partially based on drivers/mtd/nand_ids.c from Linux.                 *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "core.h"
  27 #include "fileio.h"
  28
  29 static struct nand_ecclayout nand_oob_16 = {
  30         .eccbytes = 6,
  31         .eccpos = {0, 1, 2, 3, 6, 7},
  32         .oobfree = {
  33                 {.offset = 8,
  34                  .length = 8}
  35         }
  36 };
  37
  38 static struct nand_ecclayout nand_oob_64 = {
  39         .eccbytes = 24,
  40         .eccpos = {
  41                 40, 41, 42, 43, 44, 45, 46, 47,
  42                 48, 49, 50, 51, 52, 53, 54, 55,
  43                 56, 57, 58, 59, 60, 61, 62, 63
  44         },
  45         .oobfree = {
  46                 {.offset = 2,
  47                  .length = 38}
  48         }
  49 };
  50
  51 void nand_fileio_init(struct nand_fileio_state *state)
  52 {
  53         memset(state, 0, sizeof(*state));
  54         state->oob_format = NAND_OOB_NONE;
  55 }
  56
  57 int nand_fileio_start(struct command_invocation *cmd,
  58         struct nand_device *nand, const char *filename, int filemode,
  59         struct nand_fileio_state *state)
  60 {
  61         if (state->address % nand->page_size) {
  62                 command_print(cmd, "only page-aligned addresses are supported");
  63                 return ERROR_COMMAND_SYNTAX_ERROR;
  64         }
  65
  66         duration_start(&state->bench);
  67
  68         if (NULL != filename) {
  69                 int retval = fileio_open(&state->fileio, filename, filemode, FILEIO_BINARY);
  70                 if (retval != ERROR_OK) {
  71                         const char *msg = (filemode == FILEIO_READ) ? "read" : "write";
  72                         command_print(cmd, "failed to open '%s' for %s access",
  73                                 filename, msg);
  74                         return retval;
  75                 }
  76                 state->file_opened = true;
  77         }
  78
  79         if (!(state->oob_format & NAND_OOB_ONLY)) {
  80                 state->page_size = nand->page_size;
  81                 state->page = malloc(nand->page_size);
  82         }
  83
  84         if (state->oob_format & (NAND_OOB_RAW | NAND_OOB_SW_ECC | NAND_OOB_SW_ECC_KW)) {
  85                 if (nand->page_size == 512) {
  86                         state->oob_size = 16;
  87                         state->eccpos = nand_oob_16.eccpos;
  88                 } else if (nand->page_size == 2048)   {
  89                         state->oob_size = 64;
  90                         state->eccpos = nand_oob_64.eccpos;
  91                 }
  92                 state->oob = malloc(state->oob_size);
  93         }
  94
  95         return ERROR_OK;
  96 }
  97 int nand_fileio_cleanup(struct nand_fileio_state *state)
  98 {
  99         if (state->file_opened)
 100                 fileio_close(state->fileio);
 101
 102         free(state->oob);
 103         state->oob = NULL;
 104
 105         free(state->page);
 106         state->page = NULL;
 107         return ERROR_OK;
 108 }
 109 int nand_fileio_finish(struct nand_fileio_state *state)
 110 {
 111         nand_fileio_cleanup(state);
 112         return duration_measure(&state->bench);
 113 }
 114
 115 COMMAND_HELPER(nand_fileio_parse_args, struct nand_fileio_state *state,
 116         struct nand_device **dev, enum fileio_access filemode,
 117         bool need_size, bool sw_ecc)
 118 {
 119         nand_fileio_init(state);
 120
 121         unsigned minargs = need_size ? 4 : 3;
 122         if (CMD_ARGC < minargs)
 123                 return ERROR_COMMAND_SYNTAX_ERROR;
 124
 125         struct nand_device *nand;
 126         int retval = CALL_COMMAND_HANDLER(nand_command_get_device, 0, &nand);
 127         if (retval != ERROR_OK)
 128                 return retval;
 129
 130         if (NULL == nand->device) {
 131                 command_print(CMD, "#%s: not probed", CMD_ARGV[0]);
 132                 return ERROR_NAND_DEVICE_NOT_PROBED;
 133         }
 134
 135         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], state->address);
 136         if (need_size) {
 137                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], state->size);
 138                 if (state->size % nand->page_size) {
 139                         command_print(CMD, "only page-aligned sizes are supported");
 140                         return ERROR_COMMAND_SYNTAX_ERROR;
 141                 }
 142         }
 143
 144         if (CMD_ARGC > minargs) {
 145                 for (unsigned i = minargs; i < CMD_ARGC; i++) {
 146                         if (!strcmp(CMD_ARGV[i], "oob_raw"))
 147                                 state->oob_format |= NAND_OOB_RAW;
 148                         else if (!strcmp(CMD_ARGV[i], "oob_only"))
 149                                 state->oob_format |= NAND_OOB_RAW | NAND_OOB_ONLY;
 150                         else if (sw_ecc && !strcmp(CMD_ARGV[i], "oob_softecc"))
 151                                 state->oob_format |= NAND_OOB_SW_ECC;
 152                         else if (sw_ecc && !strcmp(CMD_ARGV[i], "oob_softecc_kw"))
 153                                 state->oob_format |= NAND_OOB_SW_ECC_KW;
 154                         else {
 155                                 command_print(CMD, "unknown option: %s", CMD_ARGV[i]);
 156                                 return ERROR_COMMAND_SYNTAX_ERROR;
 157                         }
 158                 }
 159         }
 160
 161         retval = nand_fileio_start(CMD, nand, CMD_ARGV[1], filemode, state);
 162         if (retval != ERROR_OK)
 163                 return retval;
 164
 165         if (!need_size) {
 166                 size_t filesize;
 167                 retval = fileio_size(state->fileio, &filesize);
 168                 if (retval != ERROR_OK)
 169                         return retval;
 170                 state->size = filesize;
 171         }
 172
 173         *dev = nand;
 174
 175         return ERROR_OK;
 176 }
 177
 178 /**
 179  * @returns If no error occurred, returns number of bytes consumed;
 180  * otherwise, returns a negative error code.)
 181  */
 182 int nand_fileio_read(struct nand_device *nand, struct nand_fileio_state *s)
 183 {
 184         size_t total_read = 0;
 185         size_t one_read;
 186
 187         if (NULL != s->page) {
 188                 fileio_read(s->fileio, s->page_size, s->page, &one_read);
 189                 if (one_read < s->page_size)
 190                         memset(s->page + one_read, 0xff, s->page_size - one_read);
 191                 total_read += one_read;
 192         }
 193
 194         if (s->oob_format & NAND_OOB_SW_ECC) {
 195                 uint8_t ecc[3];
 196                 memset(s->oob, 0xff, s->oob_size);
 197                 for (uint32_t i = 0, j = 0; i < s->page_size; i += 256) {
 198                         nand_calculate_ecc(nand, s->page + i, ecc);
 199                         s->oob[s->eccpos[j++]] = ecc[0];
 200                         s->oob[s->eccpos[j++]] = ecc[1];
 201                         s->oob[s->eccpos[j++]] = ecc[2];
 202                 }
 203         } else if (s->oob_format & NAND_OOB_SW_ECC_KW)   {
 204                 /*
 205                  * In this case eccpos is not used as
 206                  * the ECC data is always stored contiguously
 207                  * at the end of the OOB area.  It consists
 208                  * of 10 bytes per 512-byte data block.
 209                  */
 210                 uint8_t *ecc = s->oob + s->oob_size - s->page_size / 512 * 10;
 211                 memset(s->oob, 0xff, s->oob_size);
 212                 for (uint32_t i = 0; i < s->page_size; i += 512) {
 213                         nand_calculate_ecc_kw(nand, s->page + i, ecc);
 214                         ecc += 10;
 215                 }
 216         } else if (NULL != s->oob)   {
 217                 fileio_read(s->fileio, s->oob_size, s->oob, &one_read);
 218                 if (one_read < s->oob_size)
 219                         memset(s->oob + one_read, 0xff, s->oob_size - one_read);
 220                 total_read += one_read;
 221         }
 222         return total_read;
 223 }