cmd/cros_ec.c

   1 /*
   2  * Chromium OS cros_ec driver
   3  *
   4  * Copyright (c) 2016 The Chromium OS Authors.
   5  * Copyright (c) 2016 National Instruments Corp
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <command.h>
  12 #include <cros_ec.h>
  13 #include <dm.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/uclass-internal.h>
  16
  17 /* Note: depends on enum ec_current_image */
  18 static const char * const ec_current_image_name[] = {"unknown", "RO", "RW"};
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 /**
  23  * Decode a flash region parameter
  24  *
  25  * @param argc Number of params remaining
  26  * @param argv List of remaining parameters
  27  * @return flash region (EC_FLASH_REGION_...) or -1 on error
  28  */
  29 static int cros_ec_decode_region(int argc, char * const argv[])
  30 {
  31         if (argc > 0) {
  32                 if (0 == strcmp(*argv, "rw"))
  33                         return EC_FLASH_REGION_RW;
  34                 else if (0 == strcmp(*argv, "ro"))
  35                         return EC_FLASH_REGION_RO;
  36
  37                 debug("%s: Invalid region '%s'\n", __func__, *argv);
  38         } else {
  39                 debug("%s: Missing region parameter\n", __func__);
  40         }
  41
  42         return -1;
  43 }
  44
  45 /**
  46  * Perform a flash read or write command
  47  *
  48  * @param dev           CROS-EC device to read/write
  49  * @param is_write      1 do to a write, 0 to do a read
  50  * @param argc          Number of arguments
  51  * @param argv          Arguments (2 is region, 3 is address)
  52  * @return 0 for ok, 1 for a usage error or -ve for ec command error
  53  *      (negative EC_RES_...)
  54  */
  55 static int do_read_write(struct cros_ec_dev *dev, int is_write, int argc,
  56                          char * const argv[])
  57 {
  58         uint32_t offset, size = -1U, region_size;
  59         unsigned long addr;
  60         char *endp;
  61         int region;
  62         int ret;
  63
  64         region = cros_ec_decode_region(argc - 2, argv + 2);
  65         if (region == -1)
  66                 return 1;
  67         if (argc < 4)
  68                 return 1;
  69         addr = simple_strtoul(argv[3], &endp, 16);
  70         if (*argv[3] == 0 || *endp != 0)
  71                 return 1;
  72         if (argc > 4) {
  73                 size = simple_strtoul(argv[4], &endp, 16);
  74                 if (*argv[4] == 0 || *endp != 0)
  75                         return 1;
  76         }
  77
  78         ret = cros_ec_flash_offset(dev, region, &offset, &region_size);
  79         if (ret) {
  80                 debug("%s: Could not read region info\n", __func__);
  81                 return ret;
  82         }
  83         if (size == -1U)
  84                 size = region_size;
  85
  86         ret = is_write ?
  87                 cros_ec_flash_write(dev, (uint8_t *)addr, offset, size) :
  88                 cros_ec_flash_read(dev, (uint8_t *)addr, offset, size);
  89         if (ret) {
  90                 debug("%s: Could not %s region\n", __func__,
  91                       is_write ? "write" : "read");
  92                 return ret;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  99 {
 100         struct cros_ec_dev *dev;
 101         struct udevice *udev;
 102         const char *cmd;
 103         int ret = 0;
 104
 105         if (argc < 2)
 106                 return CMD_RET_USAGE;
 107
 108         cmd = argv[1];
 109         if (0 == strcmp("init", cmd)) {
 110                 /* Remove any existing device */
 111                 ret = uclass_find_device(UCLASS_CROS_EC, 0, &udev);
 112                 if (!ret)
 113                         device_remove(udev);
 114                 ret = uclass_get_device(UCLASS_CROS_EC, 0, &udev);
 115                 if (ret) {
 116                         printf("Could not init cros_ec device (err %d)\n", ret);
 117                         return 1;
 118                 }
 119                 return 0;
 120         }
 121
 122         ret = uclass_get_device(UCLASS_CROS_EC, 0, &udev);
 123         if (ret) {
 124                 printf("Cannot get cros-ec device (err=%d)\n", ret);
 125                 return 1;
 126         }
 127         dev = dev_get_uclass_priv(udev);
 128         if (0 == strcmp("id", cmd)) {
 129                 char id[MSG_BYTES];
 130
 131                 if (cros_ec_read_id(dev, id, sizeof(id))) {
 132                         debug("%s: Could not read KBC ID\n", __func__);
 133                         return 1;
 134                 }
 135                 printf("%s\n", id);
 136         } else if (0 == strcmp("info", cmd)) {
 137                 struct ec_response_mkbp_info info;
 138
 139                 if (cros_ec_info(dev, &info)) {
 140                         debug("%s: Could not read KBC info\n", __func__);
 141                         return 1;
 142                 }
 143                 printf("rows     = %u\n", info.rows);
 144                 printf("cols     = %u\n", info.cols);
 145                 printf("switches = %#x\n", info.switches);
 146         } else if (0 == strcmp("curimage", cmd)) {
 147                 enum ec_current_image image;
 148
 149                 if (cros_ec_read_current_image(dev, &image)) {
 150                         debug("%s: Could not read KBC image\n", __func__);
 151                         return 1;
 152                 }
 153                 printf("%d\n", image);
 154         } else if (0 == strcmp("hash", cmd)) {
 155                 struct ec_response_vboot_hash hash;
 156                 int i;
 157
 158                 if (cros_ec_read_hash(dev, &hash)) {
 159                         debug("%s: Could not read KBC hash\n", __func__);
 160                         return 1;
 161                 }
 162
 163                 if (hash.hash_type == EC_VBOOT_HASH_TYPE_SHA256)
 164                         printf("type:    SHA-256\n");
 165                 else
 166                         printf("type:    %d\n", hash.hash_type);
 167
 168                 printf("offset:  0x%08x\n", hash.offset);
 169                 printf("size:    0x%08x\n", hash.size);
 170
 171                 printf("digest:  ");
 172                 for (i = 0; i < hash.digest_size; i++)
 173                         printf("%02x", hash.hash_digest[i]);
 174                 printf("\n");
 175         } else if (0 == strcmp("reboot", cmd)) {
 176                 int region;
 177                 enum ec_reboot_cmd cmd;
 178
 179                 if (argc >= 3 && !strcmp(argv[2], "cold")) {
 180                         cmd = EC_REBOOT_COLD;
 181                 } else {
 182                         region = cros_ec_decode_region(argc - 2, argv + 2);
 183                         if (region == EC_FLASH_REGION_RO)
 184                                 cmd = EC_REBOOT_JUMP_RO;
 185                         else if (region == EC_FLASH_REGION_RW)
 186                                 cmd = EC_REBOOT_JUMP_RW;
 187                         else
 188                                 return CMD_RET_USAGE;
 189                 }
 190
 191                 if (cros_ec_reboot(dev, cmd, 0)) {
 192                         debug("%s: Could not reboot KBC\n", __func__);
 193                         return 1;
 194                 }
 195         } else if (0 == strcmp("events", cmd)) {
 196                 uint32_t events;
 197
 198                 if (cros_ec_get_host_events(dev, &events)) {
 199                         debug("%s: Could not read host events\n", __func__);
 200                         return 1;
 201                 }
 202                 printf("0x%08x\n", events);
 203         } else if (0 == strcmp("clrevents", cmd)) {
 204                 uint32_t events = 0x7fffffff;
 205
 206                 if (argc >= 3)
 207                         events = simple_strtol(argv[2], NULL, 0);
 208
 209                 if (cros_ec_clear_host_events(dev, events)) {
 210                         debug("%s: Could not clear host events\n", __func__);
 211                         return 1;
 212                 }
 213         } else if (0 == strcmp("read", cmd)) {
 214                 ret = do_read_write(dev, 0, argc, argv);
 215                 if (ret > 0)
 216                         return CMD_RET_USAGE;
 217         } else if (0 == strcmp("write", cmd)) {
 218                 ret = do_read_write(dev, 1, argc, argv);
 219                 if (ret > 0)
 220                         return CMD_RET_USAGE;
 221         } else if (0 == strcmp("erase", cmd)) {
 222                 int region = cros_ec_decode_region(argc - 2, argv + 2);
 223                 uint32_t offset, size;
 224
 225                 if (region == -1)
 226                         return CMD_RET_USAGE;
 227                 if (cros_ec_flash_offset(dev, region, &offset, &size)) {
 228                         debug("%s: Could not read region info\n", __func__);
 229                         ret = -1;
 230                 } else {
 231                         ret = cros_ec_flash_erase(dev, offset, size);
 232                         if (ret) {
 233                                 debug("%s: Could not erase region\n",
 234                                       __func__);
 235                         }
 236                 }
 237         } else if (0 == strcmp("regioninfo", cmd)) {
 238                 int region = cros_ec_decode_region(argc - 2, argv + 2);
 239                 uint32_t offset, size;
 240
 241                 if (region == -1)
 242                         return CMD_RET_USAGE;
 243                 ret = cros_ec_flash_offset(dev, region, &offset, &size);
 244                 if (ret) {
 245                         debug("%s: Could not read region info\n", __func__);
 246                 } else {
 247                         printf("Region: %s\n", region == EC_FLASH_REGION_RO ?
 248                                         "RO" : "RW");
 249                         printf("Offset: %x\n", offset);
 250                         printf("Size:   %x\n", size);
 251                 }
 252         } else if (0 == strcmp("flashinfo", cmd)) {
 253                 struct ec_response_flash_info p;
 254
 255                 ret = cros_ec_read_flashinfo(dev, &p);
 256                 if (!ret) {
 257                         printf("Flash size:         %u\n", p.flash_size);
 258                         printf("Write block size:   %u\n", p.write_block_size);
 259                         printf("Erase block size:   %u\n", p.erase_block_size);
 260                 }
 261         } else if (0 == strcmp("vbnvcontext", cmd)) {
 262                 uint8_t block[EC_VBNV_BLOCK_SIZE];
 263                 char buf[3];
 264                 int i, len;
 265                 unsigned long result;
 266
 267                 if (argc <= 2) {
 268                         ret = cros_ec_read_vbnvcontext(dev, block);
 269                         if (!ret) {
 270                                 printf("vbnv_block: ");
 271                                 for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++)
 272                                         printf("%02x", block[i]);
 273                                 putc('\n');
 274                         }
 275                 } else {
 276                         /*
 277                          * TODO(clchiou): Move this to a utility function as
 278                          * cmd_spi might want to call it.
 279                          */
 280                         memset(block, 0, EC_VBNV_BLOCK_SIZE);
 281                         len = strlen(argv[2]);
 282                         buf[2] = '\0';
 283                         for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++) {
 284                                 if (i * 2 >= len)
 285                                         break;
 286                                 buf[0] = argv[2][i * 2];
 287                                 if (i * 2 + 1 >= len)
 288                                         buf[1] = '0';
 289                                 else
 290                                         buf[1] = argv[2][i * 2 + 1];
 291                                 strict_strtoul(buf, 16, &result);
 292                                 block[i] = result;
 293                         }
 294                         ret = cros_ec_write_vbnvcontext(dev, block);
 295                 }
 296                 if (ret) {
 297                         debug("%s: Could not %s VbNvContext\n", __func__,
 298                               argc <= 2 ?  "read" : "write");
 299                 }
 300         } else if (0 == strcmp("test", cmd)) {
 301                 int result = cros_ec_test(dev);
 302
 303                 if (result)
 304                         printf("Test failed with error %d\n", result);
 305                 else
 306                         puts("Test passed\n");
 307         } else if (0 == strcmp("version", cmd)) {
 308                 struct ec_response_get_version *p;
 309                 char *build_string;
 310
 311                 ret = cros_ec_read_version(dev, &p);
 312                 if (!ret) {
 313                         /* Print versions */
 314                         printf("RO version:    %1.*s\n",
 315                                (int)sizeof(p->version_string_ro),
 316                                p->version_string_ro);
 317                         printf("RW version:    %1.*s\n",
 318                                (int)sizeof(p->version_string_rw),
 319                                p->version_string_rw);
 320                         printf("Firmware copy: %s\n",
 321                                (p->current_image <
 322                                ARRAY_SIZE(ec_current_image_name) ?
 323                                ec_current_image_name[p->current_image] :
 324                                "?"));
 325                         ret = cros_ec_read_build_info(dev, &build_string);
 326                         if (!ret)
 327                                 printf("Build info:    %s\n", build_string);
 328                 }
 329         } else if (0 == strcmp("ldo", cmd)) {
 330                 uint8_t index, state;
 331                 char *endp;
 332
 333                 if (argc < 3)
 334                         return CMD_RET_USAGE;
 335                 index = simple_strtoul(argv[2], &endp, 10);
 336                 if (*argv[2] == 0 || *endp != 0)
 337                         return CMD_RET_USAGE;
 338                 if (argc > 3) {
 339                         state = simple_strtoul(argv[3], &endp, 10);
 340                         if (*argv[3] == 0 || *endp != 0)
 341                                 return CMD_RET_USAGE;
 342                         ret = cros_ec_set_ldo(udev, index, state);
 343                 } else {
 344                         ret = cros_ec_get_ldo(udev, index, &state);
 345                         if (!ret) {
 346                                 printf("LDO%d: %s\n", index,
 347                                        state == EC_LDO_STATE_ON ?
 348                                        "on" : "off");
 349                         }
 350                 }
 351
 352                 if (ret) {
 353                         debug("%s: Could not access LDO%d\n", __func__, index);
 354                         return ret;
 355                 }
 356         } else {
 357                 return CMD_RET_USAGE;
 358         }
 359
 360         if (ret < 0) {
 361                 printf("Error: CROS-EC command failed (error %d)\n", ret);
 362                 ret = 1;
 363         }
 364
 365         return ret;
 366 }
 367
 368 U_BOOT_CMD(
 369         crosec, 6,      1,      do_cros_ec,
 370         "CROS-EC utility command",
 371         "init                Re-init CROS-EC (done on startup automatically)\n"
 372         "crosec id                  Read CROS-EC ID\n"
 373         "crosec info                Read CROS-EC info\n"
 374         "crosec curimage            Read CROS-EC current image\n"
 375         "crosec hash                Read CROS-EC hash\n"
 376         "crosec reboot [rw | ro | cold]  Reboot CROS-EC\n"
 377         "crosec events              Read CROS-EC host events\n"
 378         "crosec clrevents [mask]    Clear CROS-EC host events\n"
 379         "crosec regioninfo <ro|rw>  Read image info\n"
 380         "crosec flashinfo           Read flash info\n"
 381         "crosec erase <ro|rw>       Erase EC image\n"
 382         "crosec read <ro|rw> <addr> [<size>]   Read EC image\n"
 383         "crosec write <ro|rw> <addr> [<size>]  Write EC image\n"
 384         "crosec vbnvcontext [hexstring]        Read [write] VbNvContext from EC\n"
 385         "crosec ldo <idx> [<state>] Switch/Read LDO state\n"
 386         "crosec test                run tests on cros_ec\n"
 387         "crosec version             Read CROS-EC version"
 388 );