src/flash/nand/fileio.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2007 by Dominic Rath <Dominic.Rath@gmx.de>              *
   5  *   Copyright (C) 2002 Thomas Gleixner <tglx@linutronix.de>               *
   6  *   Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>             *
   7  *                                                                         *
   8  *   Partially based on drivers/mtd/nand_ids.c from Linux.                 *
   9  ***************************************************************************/
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include "core.h"
  16 #include "fileio.h"
  17
  18 static struct nand_ecclayout nand_oob_16 = {
  19         .eccbytes = 6,
  20         .eccpos = {0, 1, 2, 3, 6, 7},
  21         .oobfree = {
  22                 {.offset = 8,
  23                  .length = 8}
  24         }
  25 };
  26
  27 static struct nand_ecclayout nand_oob_64 = {
  28         .eccbytes = 24,
  29         .eccpos = {
  30                 40, 41, 42, 43, 44, 45, 46, 47,
  31                 48, 49, 50, 51, 52, 53, 54, 55,
  32                 56, 57, 58, 59, 60, 61, 62, 63
  33         },
  34         .oobfree = {
  35                 {.offset = 2,
  36                  .length = 38}
  37         }
  38 };
  39
  40 void nand_fileio_init(struct nand_fileio_state *state)
  41 {
  42         memset(state, 0, sizeof(*state));
  43         state->oob_format = NAND_OOB_NONE;
  44 }
  45
  46 int nand_fileio_start(struct command_invocation *cmd,
  47         struct nand_device *nand, const char *filename, int filemode,
  48         struct nand_fileio_state *state)
  49 {
  50         if (state->address % nand->page_size) {
  51                 command_print(cmd, "only page-aligned addresses are supported");
  52                 return ERROR_COMMAND_SYNTAX_ERROR;
  53         }
  54
  55         duration_start(&state->bench);
  56
  57         if (filename) {
  58                 int retval = fileio_open(&state->fileio, filename, filemode, FILEIO_BINARY);
  59                 if (retval != ERROR_OK) {
  60                         const char *msg = (filemode == FILEIO_READ) ? "read" : "write";
  61                         command_print(cmd, "failed to open '%s' for %s access",
  62                                 filename, msg);
  63                         return retval;
  64                 }
  65                 state->file_opened = true;
  66         }
  67
  68         if (!(state->oob_format & NAND_OOB_ONLY)) {
  69                 state->page_size = nand->page_size;
  70                 state->page = malloc(nand->page_size);
  71         }
  72
  73         if (state->oob_format & (NAND_OOB_RAW | NAND_OOB_SW_ECC | NAND_OOB_SW_ECC_KW)) {
  74                 if (nand->page_size == 512) {
  75                         state->oob_size = 16;
  76                         state->eccpos = nand_oob_16.eccpos;
  77                 } else if (nand->page_size == 2048)   {
  78                         state->oob_size = 64;
  79                         state->eccpos = nand_oob_64.eccpos;
  80                 }
  81                 state->oob = malloc(state->oob_size);
  82         }
  83
  84         return ERROR_OK;
  85 }
  86 int nand_fileio_cleanup(struct nand_fileio_state *state)
  87 {
  88         if (state->file_opened)
  89                 fileio_close(state->fileio);
  90
  91         free(state->oob);
  92         state->oob = NULL;
  93
  94         free(state->page);
  95         state->page = NULL;
  96         return ERROR_OK;
  97 }
  98 int nand_fileio_finish(struct nand_fileio_state *state)
  99 {
 100         nand_fileio_cleanup(state);
 101         return duration_measure(&state->bench);
 102 }
 103
 104 COMMAND_HELPER(nand_fileio_parse_args, struct nand_fileio_state *state,
 105         struct nand_device **dev, enum fileio_access filemode,
 106         bool need_size, bool sw_ecc)
 107 {
 108         nand_fileio_init(state);
 109
 110         unsigned minargs = need_size ? 4 : 3;
 111         if (minargs > CMD_ARGC)
 112                 return ERROR_COMMAND_SYNTAX_ERROR;
 113
 114         struct nand_device *nand;
 115         int retval = CALL_COMMAND_HANDLER(nand_command_get_device, 0, &nand);
 116         if (retval != ERROR_OK)
 117                 return retval;
 118
 119         if (!nand->device) {
 120                 command_print(CMD, "#%s: not probed", CMD_ARGV[0]);
 121                 return ERROR_NAND_DEVICE_NOT_PROBED;
 122         }
 123
 124         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], state->address);
 125         if (need_size) {
 126                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], state->size);
 127                 if (state->size % nand->page_size) {
 128                         command_print(CMD, "only page-aligned sizes are supported");
 129                         return ERROR_COMMAND_SYNTAX_ERROR;
 130                 }
 131         }
 132
 133         if (minargs < CMD_ARGC) {
 134                 for (unsigned i = minargs; i < CMD_ARGC; i++) {
 135                         if (!strcmp(CMD_ARGV[i], "oob_raw"))
 136                                 state->oob_format |= NAND_OOB_RAW;
 137                         else if (!strcmp(CMD_ARGV[i], "oob_only"))
 138                                 state->oob_format |= NAND_OOB_RAW | NAND_OOB_ONLY;
 139                         else if (sw_ecc && !strcmp(CMD_ARGV[i], "oob_softecc"))
 140                                 state->oob_format |= NAND_OOB_SW_ECC;
 141                         else if (sw_ecc && !strcmp(CMD_ARGV[i], "oob_softecc_kw"))
 142                                 state->oob_format |= NAND_OOB_SW_ECC_KW;
 143                         else {
 144                                 command_print(CMD, "unknown option: %s", CMD_ARGV[i]);
 145                                 return ERROR_COMMAND_SYNTAX_ERROR;
 146                         }
 147                 }
 148         }
 149
 150         retval = nand_fileio_start(CMD, nand, CMD_ARGV[1], filemode, state);
 151         if (retval != ERROR_OK)
 152                 return retval;
 153
 154         if (!need_size) {
 155                 size_t filesize;
 156                 retval = fileio_size(state->fileio, &filesize);
 157                 if (retval != ERROR_OK)
 158                         return retval;
 159                 state->size = filesize;
 160         }
 161
 162         *dev = nand;
 163
 164         return ERROR_OK;
 165 }
 166
 167 /**
 168  * @returns If no error occurred, returns number of bytes consumed;
 169  * otherwise, returns a negative error code.)
 170  */
 171 int nand_fileio_read(struct nand_device *nand, struct nand_fileio_state *s)
 172 {
 173         size_t total_read = 0;
 174         size_t one_read;
 175
 176         if (s->page) {
 177                 fileio_read(s->fileio, s->page_size, s->page, &one_read);
 178                 if (one_read < s->page_size)
 179                         memset(s->page + one_read, 0xff, s->page_size - one_read);
 180                 total_read += one_read;
 181         }
 182
 183         if (s->oob_format & NAND_OOB_SW_ECC) {
 184                 uint8_t ecc[3];
 185                 memset(s->oob, 0xff, s->oob_size);
 186                 for (uint32_t i = 0, j = 0; i < s->page_size; i += 256) {
 187                         nand_calculate_ecc(nand, s->page + i, ecc);
 188                         s->oob[s->eccpos[j++]] = ecc[0];
 189                         s->oob[s->eccpos[j++]] = ecc[1];
 190                         s->oob[s->eccpos[j++]] = ecc[2];
 191                 }
 192         } else if (s->oob_format & NAND_OOB_SW_ECC_KW)   {
 193                 /*
 194                  * In this case eccpos is not used as
 195                  * the ECC data is always stored contiguously
 196                  * at the end of the OOB area.  It consists
 197                  * of 10 bytes per 512-byte data block.
 198                  */
 199                 uint8_t *ecc = s->oob + s->oob_size - s->page_size / 512 * 10;
 200                 memset(s->oob, 0xff, s->oob_size);
 201                 for (uint32_t i = 0; i < s->page_size; i += 512) {
 202                         nand_calculate_ecc_kw(nand, s->page + i, ecc);
 203                         ecc += 10;
 204                 }
 205         } else if (s->oob)   {
 206                 fileio_read(s->fileio, s->oob_size, s->oob, &one_read);
 207                 if (one_read < s->oob_size)
 208                         memset(s->oob + one_read, 0xff, s->oob_size - one_read);
 209                 total_read += one_read;
 210         }
 211         return total_read;
 212 }