src/flash/nor/dsp5680xx_flash.c

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Rodrigo L. Rosa                                 *
   3  *   rodrigorosa.LG@gmail.com                                              *
   4  *                                                                         *
   5  *   Based on a file written by:                                           *
   6  *   Kevin McGuire                                                         *
   7  *   Marcel Wijlaars                                                       *
   8  *   Michael Ashton                                                        *
   9  *                                                                         *
  10  *   This program is free software; you can redistribute it and/or modify  *
  11  *   it under the terms of the GNU General Public License as published by  *
  12  *   the Free Software Foundation; either version 2 of the License, or     *
  13  *   (at your option) any later version.                                   *
  14  *                                                                         *
  15  *   This program is distributed in the hope that it will be useful,       *
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  18  *   GNU General Public License for more details.                          *
  19  *                                                                         *
  20  *   You should have received a copy of the GNU General Public License     *
  21  *   along with this program; if not, write to the                         *
  22  *   Free Software Foundation, Inc.,                                       *
  23  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  24  ***************************************************************************/
  25
  26 /**
  27  * @file   dsp5680xx_flash.c
  28  * @author Rodrigo L. Rosa <rodrigorosa.LG@gmail.com>
  29  * @date   Thu Jun  9 18:21:58 2011
  30  *
  31  * @brief  This file implements the basic functions to run flashing commands
  32  * from the TCL interface.
  33  * It allows the user to flash the Freescale 5680xx DSP.
  34  *
  35  *
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include "imp.h"
  43 #include <helper/binarybuffer.h>
  44 #include <helper/time_support.h>
  45 #include <target/algorithm.h>
  46 #include <target/dsp5680xx.h>
  47
  48 static int dsp5680xx_build_sector_list(struct flash_bank *bank)
  49 {
  50         uint32_t offset = HFM_FLASH_BASE_ADDR;
  51
  52         bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
  53         int i;
  54
  55         for (i = 0; i < bank->num_sectors; ++i) {
  56                 bank->sectors[i].offset = i * HFM_SECTOR_SIZE;
  57                 bank->sectors[i].size = HFM_SECTOR_SIZE;
  58                 offset += bank->sectors[i].size;
  59                 bank->sectors[i].is_erased = -1;
  60                 bank->sectors[i].is_protected = -1;
  61         }
  62         LOG_USER("%s not tested yet.", __func__);
  63         return ERROR_OK;
  64
  65 }
  66
  67 /* flash bank dsp5680xx 0 0 0 0 <target#> */
  68 FLASH_BANK_COMMAND_HANDLER(dsp5680xx_flash_bank_command)
  69 {
  70         bank->base = HFM_FLASH_BASE_ADDR;
  71         bank->size = HFM_SIZE_BYTES; /* top 4k not accessible */
  72         bank->num_sectors = HFM_SECTOR_COUNT;
  73         dsp5680xx_build_sector_list(bank);
  74
  75         return ERROR_OK;
  76 }
  77
  78 /**
  79  * A memory mapped register (PROT) holds information regarding sector protection.
  80  * Protection refers to undesired core access.
  81  * The value in this register is loaded from flash upon reset.
  82  *
  83  * @param bank
  84  *
  85  * @return
  86  */
  87 static int dsp5680xx_flash_protect_check(struct flash_bank *bank)
  88 {
  89         int retval = ERROR_OK;
  90
  91         uint16_t protected = 0;
  92
  93         retval = dsp5680xx_f_protect_check(bank->target, &protected);
  94         if (retval != ERROR_OK) {
  95                 for (int i = 0; i < HFM_SECTOR_COUNT; i++)
  96                         bank->sectors[i].is_protected = -1;
  97                 return ERROR_OK;
  98         }
  99         for (int i = 0; i < HFM_SECTOR_COUNT / 2; i++) {
 100                 if (protected & 1) {
 101                         bank->sectors[2 * i].is_protected = 1;
 102                         bank->sectors[2 * i + 1].is_protected = 1;
 103                 } else {
 104                         bank->sectors[2 * i].is_protected = 0;
 105                         bank->sectors[2 * i + 1].is_protected = 0;
 106                 }
 107                 protected = (protected >> 1);
 108         }
 109         return retval;
 110 }
 111
 112 /**
 113  * Protection funcionality is not implemented.
 114  * The current implementation applies/removes security on the chip.
 115  * The chip is effectively secured/unsecured after the first reset
 116  * following the execution of this function.
 117  *
 118  * @param bank
 119  * @param set Apply or remove security on the chip.
 120  * @param first This parameter is ignored.
 121  * @param last This parameter is ignored.
 122  *
 123  * @return
 124  */
 125 static int dsp5680xx_flash_protect(struct flash_bank *bank, int set, int first,
 126                                    int last)
 127 {
 128 /**
 129  * This applies security to flash module after next reset, it does
 130  * not actually apply protection (protection refers to undesired access from the core)
 131  */
 132         int retval;
 133
 134         if (set)
 135                 retval = dsp5680xx_f_lock(bank->target);
 136         else {
 137                 retval = dsp5680xx_f_unlock(bank->target);
 138                 if (retval == ERROR_OK) {
 139                         /* mark all as erased */
 140                         for (int i = 0; i <= (HFM_SECTOR_COUNT - 1); i++)
 141                                 /* FM does not recognize it as erased if erased via JTAG. */
 142                                 bank->sectors[i].is_erased = 1;
 143                 }
 144         }
 145         return retval;
 146 }
 147
 148 /**
 149  * The dsp5680xx use word addressing. The "/2" that appear in the following code
 150  * are a workaround for the fact that OpenOCD uses byte addressing.
 151  *
 152  * @param bank
 153  * @param buffer Data to write to flash.
 154  * @param offset
 155  * @param count In bytes (2 bytes per address).
 156  *
 157  * @return
 158  */
 159 static int dsp5680xx_flash_write(struct flash_bank *bank, uint8_t * buffer,
 160                                  uint32_t offset, uint32_t count)
 161 {
 162         int retval;
 163
 164         if ((offset + count / 2) > bank->size) {
 165                 LOG_ERROR("%s: Flash bank cannot fit data.", __func__);
 166                 return ERROR_FAIL;
 167         }
 168         if (offset % 2) {
 169                 /**
 170                  * Writing to odd addresses not supported.
 171                  * This chip uses word addressing, Openocd only supports byte addressing.
 172                  * The workaround results in disabling writing to odd byte addresses
 173                  */
 174                 LOG_ERROR("%s: Writing to odd addresses not supported for this target", __func__);
 175                 return ERROR_FAIL;
 176         }
 177         retval = dsp5680xx_f_wr(bank->target, buffer, bank->base + offset / 2, count, 0);
 178         uint32_t addr_word;
 179
 180         for (addr_word = bank->base + offset / 2; addr_word < count / 2;
 181                         addr_word += (HFM_SECTOR_SIZE / 2)) {
 182                 if (retval == ERROR_OK)
 183                         bank->sectors[addr_word / (HFM_SECTOR_SIZE / 2)].is_erased = 0;
 184                 else
 185                         bank->sectors[addr_word / (HFM_SECTOR_SIZE / 2)].is_erased = -1;
 186         }
 187         return retval;
 188 }
 189
 190 static int dsp5680xx_probe(struct flash_bank *bank)
 191 {
 192         LOG_DEBUG("%s not implemented", __func__);
 193         return ERROR_OK;
 194 }
 195
 196 /**
 197  * The flash module (FM) on the dsp5680xx supports both individual sector
 198  * and mass erase of the flash memory.
 199  * If this function is called with @first == @last == 0 or if @first is the
 200  * first sector (#0) and @last is the last sector then the mass erase command
 201  * is executed (much faster than erasing each sector individually).
 202  *
 203  * @param bank
 204  * @param first
 205  * @param last
 206  *
 207  * @return
 208  */
 209 static int dsp5680xx_flash_erase(struct flash_bank *bank, int first, int last)
 210 {
 211         int retval;
 212
 213         retval = dsp5680xx_f_erase(bank->target, (uint32_t) first, (uint32_t) last);
 214         if ((!(first | last)) || ((first == 0) && (last == (HFM_SECTOR_COUNT - 1))))
 215                 last = HFM_SECTOR_COUNT - 1;
 216         if (retval == ERROR_OK)
 217                 for (int i = first; i <= last; i++)
 218                         bank->sectors[i].is_erased = 1;
 219         else
 220                 /**
 221                  * If an error occurred unknown status
 222                  *is set even though some sector could have been correctly erased.
 223                  */
 224                 for (int i = first; i <= last; i++)
 225                         bank->sectors[i].is_erased = -1;
 226         return retval;
 227 }
 228
 229 /**
 230  * The flash module (FM) on the dsp5680xx support a blank check function.
 231  * This function executes the FM's blank check functionality on each and every sector.
 232  *
 233  * @param bank
 234  *
 235  * @return
 236  */
 237 static int dsp5680xx_flash_erase_check(struct flash_bank *bank)
 238 {
 239         int retval = ERROR_OK;
 240
 241         uint8_t erased = 0;
 242
 243         uint32_t i;
 244
 245         for (i = 0; i < HFM_SECTOR_COUNT; i++) {
 246                 if (bank->sectors[i].is_erased == -1) {
 247                         retval = dsp5680xx_f_erase_check(bank->target, &erased, i);
 248                         if (retval != ERROR_OK) {
 249                                 bank->sectors[i].is_erased = -1;
 250                         } else {
 251                                 if (erased)
 252                                         bank->sectors[i].is_erased = 1;
 253                                 else
 254                                         bank->sectors[i].is_erased = 0;
 255                         }
 256                 }
 257         }
 258         return retval;
 259 }
 260
 261 struct flash_driver dsp5680xx_flash = {
 262         .name = "dsp5680xx_flash",
 263         .flash_bank_command = dsp5680xx_flash_bank_command,
 264         .erase = dsp5680xx_flash_erase,
 265         .protect = dsp5680xx_flash_protect,
 266         .write = dsp5680xx_flash_write,
 267         /* .read = default_flash_read, */
 268         .probe = dsp5680xx_probe,
 269         .auto_probe = dsp5680xx_probe,
 270         .erase_check = dsp5680xx_flash_erase_check,
 271         .protect_check = dsp5680xx_flash_protect_check,
 272 };