Angel Pons | 986d50e | 2020-04-02 23:48:53 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 2 | |
| 3 | #include <assert.h> |
| 4 | #include <cbfs.h> |
| 5 | #include <console/console.h> |
| 6 | #include <delay.h> |
| 7 | #include <ec/google/chromeec/ec.h> |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 8 | #include <halt.h> |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 9 | #include <security/vboot/misc.h> |
| 10 | #include <security/vboot/vbnv.h> |
| 11 | #include <security/vboot/vboot_common.h> |
| 12 | #include <timer.h> |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 13 | #include <timestamp.h> |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 14 | #include <vb2_api.h> |
| 15 | |
| 16 | #define _EC_FILENAME(select, suffix) \ |
| 17 | (select == VB_SELECT_FIRMWARE_READONLY ? "ecro" suffix : "ecrw" suffix) |
| 18 | #define EC_IMAGE_FILENAME(select) _EC_FILENAME(select, "") |
| 19 | #define EC_HASH_FILENAME(select) _EC_FILENAME(select, ".hash") |
| 20 | |
| 21 | /* Wait 10 ms between attempts to check if EC's hash is ready */ |
| 22 | #define CROS_EC_HASH_CHECK_DELAY_MS 10 |
| 23 | /* Give the EC 2 seconds to finish calculating its hash */ |
| 24 | #define CROS_EC_HASH_TIMEOUT_MS 2000 |
| 25 | |
| 26 | /* Wait 3 seconds after software sync for EC to clear the limit power flag. */ |
| 27 | #define LIMIT_POWER_WAIT_TIMEOUT_MS 3000 |
| 28 | /* Check the limit power flag every 10 ms while waiting. */ |
| 29 | #define LIMIT_POWER_POLL_SLEEP_MS 10 |
| 30 | |
| 31 | /* Wait 3 seconds for EC to sysjump to RW */ |
| 32 | #define CROS_EC_SYSJUMP_TIMEOUT_MS 3000 |
| 33 | |
| 34 | /* |
| 35 | * The external API for EC software sync. This function calls into |
| 36 | * vboot, which kicks off the process. Vboot runs the verified boot |
| 37 | * logic, and requires the client program to provide callbacks which |
| 38 | * perform the work. |
| 39 | */ |
| 40 | void vboot_sync_ec(void) |
| 41 | { |
| 42 | vb2_error_t retval = VB2_SUCCESS; |
| 43 | struct vb2_context *ctx; |
| 44 | |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 45 | timestamp_add_now(TS_START_EC_SYNC); |
| 46 | |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 47 | ctx = vboot_get_context(); |
| 48 | ctx->flags |= VB2_CONTEXT_EC_SYNC_SUPPORTED; |
| 49 | |
| 50 | retval = vb2api_ec_sync(ctx); |
dnojiri | dff56a0 | 2020-04-03 10:56:43 -0700 | [diff] [blame] | 51 | vboot_save_data(ctx); |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 52 | |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 53 | switch (retval) { |
| 54 | case VB2_SUCCESS: |
| 55 | break; |
| 56 | |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 57 | case VB2_REQUEST_REBOOT_EC_TO_RO: |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 58 | printk(BIOS_INFO, "EC Reboot requested. Doing cold reboot\n"); |
| 59 | if (google_chromeec_reboot(0, EC_REBOOT_COLD, 0)) |
| 60 | printk(BIOS_EMERG, "Failed to get EC to cold reboot\n"); |
| 61 | |
| 62 | halt(); |
| 63 | break; |
| 64 | |
| 65 | /* Only for EC-EFS */ |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 66 | case VB2_REQUEST_REBOOT_EC_SWITCH_RW: |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 67 | printk(BIOS_INFO, "Switch EC slot requested. Doing cold reboot\n"); |
| 68 | if (google_chromeec_reboot(0, EC_REBOOT_COLD, |
| 69 | EC_REBOOT_FLAG_SWITCH_RW_SLOT)) |
| 70 | printk(BIOS_EMERG, "Failed to get EC to cold reboot\n"); |
| 71 | |
| 72 | halt(); |
| 73 | break; |
| 74 | |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 75 | case VB2_REQUEST_REBOOT: |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 76 | printk(BIOS_INFO, "Reboot requested. Doing warm reboot\n"); |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 77 | vboot_reboot(); |
Tim Wawrzynczak | 14dd073 | 2019-12-06 09:28:29 -0700 | [diff] [blame] | 78 | break; |
| 79 | |
| 80 | default: |
| 81 | printk(BIOS_ERR, "EC software sync failed (%#x)," |
| 82 | " rebooting\n", retval); |
| 83 | vboot_reboot(); |
| 84 | break; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 85 | } |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 86 | |
| 87 | timestamp_add_now(TS_END_EC_SYNC); |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | /* Convert firmware image type into a flash offset */ |
| 91 | static uint32_t get_vboot_hash_offset(enum vb2_firmware_selection select) |
| 92 | { |
| 93 | switch (select) { |
| 94 | case VB_SELECT_FIRMWARE_READONLY: |
| 95 | return EC_VBOOT_HASH_OFFSET_RO; |
| 96 | case VB_SELECT_FIRMWARE_EC_UPDATE: |
| 97 | return EC_VBOOT_HASH_OFFSET_UPDATE; |
| 98 | default: |
| 99 | return EC_VBOOT_HASH_OFFSET_ACTIVE; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Asks the EC to calculate a hash of the specified firmware image, and |
| 105 | * returns the information in **hash and *hash_size. |
| 106 | */ |
| 107 | static vb2_error_t ec_hash_image(enum vb2_firmware_selection select, |
| 108 | const uint8_t **hash, int *hash_size) |
| 109 | { |
| 110 | static struct ec_response_vboot_hash resp; |
| 111 | uint32_t hash_offset; |
| 112 | int recalc_requested = 0; |
| 113 | struct stopwatch sw; |
| 114 | |
| 115 | hash_offset = get_vboot_hash_offset(select); |
| 116 | |
| 117 | stopwatch_init_msecs_expire(&sw, CROS_EC_HASH_TIMEOUT_MS); |
| 118 | do { |
| 119 | if (google_chromeec_get_vboot_hash(hash_offset, &resp)) |
| 120 | return VB2_ERROR_UNKNOWN; |
| 121 | |
| 122 | switch (resp.status) { |
| 123 | case EC_VBOOT_HASH_STATUS_NONE: |
| 124 | /* |
| 125 | * There is no hash available right now. |
| 126 | * Request a recalc if it hasn't been done yet. |
| 127 | */ |
| 128 | if (recalc_requested) |
| 129 | break; |
| 130 | |
| 131 | printk(BIOS_WARNING, |
| 132 | "%s: No valid hash (status=%d size=%d). " |
| 133 | "Computing...\n", __func__, resp.status, |
| 134 | resp.size); |
| 135 | |
| 136 | if (google_chromeec_start_vboot_hash( |
| 137 | EC_VBOOT_HASH_TYPE_SHA256, hash_offset, &resp)) |
| 138 | return VB2_ERROR_UNKNOWN; |
| 139 | |
| 140 | recalc_requested = 1; |
| 141 | |
| 142 | /* |
| 143 | * Expect status to be busy since we just sent |
| 144 | * a recalc request. |
| 145 | */ |
| 146 | resp.status = EC_VBOOT_HASH_STATUS_BUSY; |
| 147 | |
| 148 | /* Hash just started calculating, let it go for a bit */ |
| 149 | mdelay(CROS_EC_HASH_CHECK_DELAY_MS); |
| 150 | break; |
| 151 | |
| 152 | case EC_VBOOT_HASH_STATUS_BUSY: |
| 153 | /* Hash is still calculating. */ |
| 154 | mdelay(CROS_EC_HASH_CHECK_DELAY_MS); |
| 155 | break; |
| 156 | |
| 157 | case EC_VBOOT_HASH_STATUS_DONE: /* intentional fallthrough */ |
| 158 | default: |
| 159 | /* Hash is ready! */ |
| 160 | break; |
| 161 | } |
| 162 | } while (resp.status == EC_VBOOT_HASH_STATUS_BUSY && |
| 163 | !stopwatch_expired(&sw)); |
| 164 | |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 165 | timestamp_add_now(TS_EC_HASH_READY); |
| 166 | |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 167 | if (resp.status != EC_VBOOT_HASH_STATUS_DONE) { |
| 168 | printk(BIOS_ERR, "%s: Hash status not done: %d\n", __func__, |
| 169 | resp.status); |
| 170 | return VB2_ERROR_UNKNOWN; |
| 171 | } |
| 172 | if (resp.hash_type != EC_VBOOT_HASH_TYPE_SHA256) { |
| 173 | printk(BIOS_ERR, "EC hash was the wrong type.\n"); |
| 174 | return VB2_ERROR_UNKNOWN; |
| 175 | } |
| 176 | |
| 177 | printk(BIOS_INFO, "EC took %luus to calculate image hash\n", |
| 178 | stopwatch_duration_usecs(&sw)); |
| 179 | |
| 180 | *hash = resp.hash_digest; |
| 181 | *hash_size = resp.digest_size; |
| 182 | |
| 183 | return VB2_SUCCESS; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Asks the EC to protect or unprotect the specified flash region. |
| 188 | */ |
| 189 | static vb2_error_t ec_protect_flash(enum vb2_firmware_selection select, int enable) |
| 190 | { |
| 191 | struct ec_response_flash_protect resp; |
| 192 | uint32_t protected_region = EC_FLASH_PROTECT_ALL_NOW; |
| 193 | const uint32_t mask = EC_FLASH_PROTECT_ALL_NOW | EC_FLASH_PROTECT_ALL_AT_BOOT; |
| 194 | |
| 195 | if (select == VB_SELECT_FIRMWARE_READONLY) |
| 196 | protected_region = EC_FLASH_PROTECT_RO_NOW; |
| 197 | |
| 198 | if (google_chromeec_flash_protect(mask, enable ? mask : 0, &resp) != 0) |
| 199 | return VB2_ERROR_UNKNOWN; |
| 200 | |
| 201 | if (!enable) { |
| 202 | /* If protection is still enabled, need reboot */ |
| 203 | if (resp.flags & protected_region) |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 204 | return VB2_REQUEST_REBOOT_EC_TO_RO; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 205 | |
| 206 | return VB2_SUCCESS; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * If write protect and ro-at-boot aren't both asserted, don't expect |
| 211 | * protection enabled. |
| 212 | */ |
| 213 | if ((~resp.flags) & (EC_FLASH_PROTECT_GPIO_ASSERTED | |
| 214 | EC_FLASH_PROTECT_RO_AT_BOOT)) |
| 215 | return VB2_SUCCESS; |
| 216 | |
| 217 | /* If flash is protected now, success */ |
| 218 | if (resp.flags & EC_FLASH_PROTECT_ALL_NOW) |
| 219 | return VB2_SUCCESS; |
| 220 | |
| 221 | /* If RW will be protected at boot but not now, need a reboot */ |
| 222 | if (resp.flags & EC_FLASH_PROTECT_ALL_AT_BOOT) |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 223 | return VB2_REQUEST_REBOOT_EC_TO_RO; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 224 | |
| 225 | /* Otherwise, it's an error */ |
| 226 | return VB2_ERROR_UNKNOWN; |
| 227 | } |
| 228 | |
| 229 | /* Convert a firmware image type to an EC flash region */ |
| 230 | static enum ec_flash_region vboot_to_ec_region(enum vb2_firmware_selection select) |
| 231 | { |
| 232 | switch (select) { |
| 233 | case VB_SELECT_FIRMWARE_READONLY: |
| 234 | return EC_FLASH_REGION_WP_RO; |
| 235 | case VB_SELECT_FIRMWARE_EC_UPDATE: |
| 236 | return EC_FLASH_REGION_UPDATE; |
| 237 | default: |
| 238 | return EC_FLASH_REGION_ACTIVE; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Read the EC's burst size bytes at a time from CBFS, and then send |
| 244 | * the chunk to the EC for it to write into its flash. |
| 245 | */ |
| 246 | static vb2_error_t ec_flash_write(struct region_device *image_region, |
| 247 | uint32_t region_offset, int image_size) |
| 248 | { |
| 249 | struct ec_response_get_protocol_info resp_proto; |
| 250 | struct ec_response_flash_info resp_flash; |
| 251 | ssize_t pdata_max_size; |
| 252 | ssize_t burst; |
| 253 | uint8_t *file_buf; |
| 254 | struct ec_params_flash_write *params; |
| 255 | uint32_t end, off; |
| 256 | |
| 257 | /* |
| 258 | * Get EC's protocol information, so that we can figure out how much |
| 259 | * data can be sent in one message. |
| 260 | */ |
| 261 | if (google_chromeec_get_protocol_info(&resp_proto)) { |
| 262 | printk(BIOS_ERR, "Failed to get EC protocol information; " |
| 263 | "skipping flash write\n"); |
| 264 | return VB2_ERROR_UNKNOWN; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Determine burst size. This must be a multiple of the write block |
| 269 | * size, and must also fit into the host parameter buffer. |
| 270 | */ |
| 271 | if (google_chromeec_flash_info(&resp_flash)) { |
| 272 | printk(BIOS_ERR, "Failed to get EC flash information; " |
| 273 | "skipping flash write\n"); |
| 274 | return VB2_ERROR_UNKNOWN; |
| 275 | } |
| 276 | |
| 277 | /* Limit the potential buffer stack allocation to 1K */ |
| 278 | pdata_max_size = MIN(1024, resp_proto.max_request_packet_size - |
| 279 | sizeof(struct ec_host_request)); |
| 280 | |
| 281 | /* Round burst to a multiple of the flash write block size */ |
| 282 | burst = pdata_max_size - sizeof(*params); |
| 283 | burst = (burst / resp_flash.write_block_size) * |
| 284 | resp_flash.write_block_size; |
| 285 | |
| 286 | /* Buffer too small */ |
| 287 | if (burst <= 0) { |
| 288 | printk(BIOS_ERR, "Flash write buffer too small! skipping " |
| 289 | "flash write\n"); |
| 290 | return VB2_ERROR_UNKNOWN; |
| 291 | } |
| 292 | |
| 293 | /* Allocate buffer on the stack */ |
| 294 | params = alloca(burst + sizeof(*params)); |
| 295 | |
| 296 | /* Fill up the buffer */ |
| 297 | end = region_offset + image_size; |
| 298 | for (off = region_offset; off < end; off += burst) { |
| 299 | uint32_t todo = MIN(end - off, burst); |
| 300 | uint32_t xfer_size = todo + sizeof(*params); |
| 301 | |
| 302 | /* Map 'todo' bytes into memory */ |
| 303 | file_buf = rdev_mmap(image_region, off - region_offset, todo); |
| 304 | if (file_buf == NULL) |
| 305 | return VB2_ERROR_UNKNOWN; |
| 306 | |
| 307 | params->offset = off; |
| 308 | params->size = todo; |
| 309 | |
| 310 | /* Read todo bytes into the buffer */ |
| 311 | memcpy(params + 1, file_buf, todo); |
| 312 | |
| 313 | if (rdev_munmap(image_region, file_buf)) |
| 314 | return VB2_ERROR_UNKNOWN; |
| 315 | |
| 316 | /* Make sure to add back in the size of the parameters */ |
| 317 | if (google_chromeec_flash_write_block( |
| 318 | (const uint8_t *)params, xfer_size)) { |
| 319 | printk(BIOS_ERR, "EC failed flash write command, " |
| 320 | "relative offset %u!\n", off - region_offset); |
| 321 | return VB2_ERROR_UNKNOWN; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | return VB2_SUCCESS; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * The logic for updating an EC firmware image. |
| 330 | */ |
| 331 | static vb2_error_t ec_update_image(enum vb2_firmware_selection select) |
| 332 | { |
| 333 | uint32_t region_offset, region_size; |
| 334 | enum ec_flash_region region; |
| 335 | vb2_error_t rv; |
| 336 | size_t image_size; |
| 337 | struct cbfsf fh; |
| 338 | const char *filename; |
| 339 | struct region_device image_region; |
| 340 | |
| 341 | /* Un-protect the flash region */ |
| 342 | rv = ec_protect_flash(select, 0); |
| 343 | if (rv != VB2_SUCCESS) |
| 344 | return rv; |
| 345 | |
| 346 | /* Convert vboot region into an EC region */ |
| 347 | region = vboot_to_ec_region(select); |
| 348 | |
| 349 | /* Get information about the flash region */ |
| 350 | if (google_chromeec_flash_region_info(region, ®ion_offset, |
| 351 | ®ion_size)) |
| 352 | return VB2_ERROR_UNKNOWN; |
| 353 | |
| 354 | /* Locate the CBFS file */ |
| 355 | filename = EC_IMAGE_FILENAME(select); |
| 356 | if (cbfs_boot_locate(&fh, filename, NULL)) |
| 357 | return VB2_ERROR_UNKNOWN; |
| 358 | |
| 359 | /* Get the file size and the region struct */ |
| 360 | image_size = region_device_sz(&fh.data); |
| 361 | cbfs_file_data(&image_region, &fh); |
| 362 | |
| 363 | /* Bail if the image is too large */ |
| 364 | if (image_size > region_size) |
| 365 | return VB2_ERROR_INVALID_PARAMETER; |
| 366 | |
| 367 | /* Erase the region */ |
| 368 | if (google_chromeec_flash_erase(region_offset, region_size)) |
| 369 | return VB2_ERROR_UNKNOWN; |
| 370 | |
| 371 | /* Write the image into the region */ |
| 372 | if (ec_flash_write(&image_region, region_offset, image_size)) |
| 373 | return VB2_ERROR_UNKNOWN; |
| 374 | |
| 375 | /* Verify the image */ |
| 376 | if (google_chromeec_efs_verify(region)) |
| 377 | return VB2_ERROR_UNKNOWN; |
| 378 | |
| 379 | return VB2_SUCCESS; |
| 380 | } |
| 381 | |
| 382 | static vb2_error_t ec_get_expected_hash(enum vb2_firmware_selection select, |
| 383 | const uint8_t **hash, |
| 384 | int *hash_size) |
| 385 | { |
| 386 | size_t size; |
| 387 | const char *filename = EC_HASH_FILENAME(select); |
| 388 | const uint8_t *file = cbfs_boot_map_with_leak(filename, CBFS_TYPE_RAW, &size); |
| 389 | |
| 390 | if (file == NULL) |
| 391 | return VB2_ERROR_UNKNOWN; |
| 392 | |
| 393 | *hash = file; |
| 394 | *hash_size = (int)size; |
| 395 | |
| 396 | return VB2_SUCCESS; |
| 397 | } |
| 398 | |
| 399 | /*********************************************************************** |
| 400 | * Vboot Callbacks |
| 401 | ***********************************************************************/ |
| 402 | |
| 403 | /* |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 404 | * Write opaque data into NV storage region. |
| 405 | */ |
Joel Kitching | 1debc0c | 2019-11-27 14:25:16 +0800 | [diff] [blame] | 406 | vb2_error_t vb2ex_commit_data(struct vb2_context *ctx) |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 407 | { |
Joel Kitching | 1debc0c | 2019-11-27 14:25:16 +0800 | [diff] [blame] | 408 | save_vbnv(ctx->nvdata); |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 409 | return VB2_SUCCESS; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Report whether the EC is in RW or not. |
| 414 | */ |
| 415 | vb2_error_t vb2ex_ec_running_rw(int *in_rw) |
| 416 | { |
| 417 | *in_rw = !google_ec_running_ro(); |
| 418 | return VB2_SUCCESS; |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Callback for when Vboot is finished. |
| 423 | */ |
| 424 | vb2_error_t vb2ex_ec_vboot_done(struct vb2_context *ctx) |
| 425 | { |
| 426 | int limit_power = 0; |
| 427 | bool message_printed = false; |
| 428 | struct stopwatch sw; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 429 | int in_recovery = !!(ctx->flags & VB2_CONTEXT_RECOVERY_MODE); |
| 430 | |
| 431 | /* |
| 432 | * Do not wait for the limit power flag to be cleared in |
| 433 | * recovery mode since we didn't just sysjump. |
| 434 | */ |
| 435 | if (in_recovery) |
| 436 | return VB2_SUCCESS; |
| 437 | |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 438 | timestamp_add_now(TS_EC_POWER_LIMIT_WAIT); |
| 439 | |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 440 | stopwatch_init_msecs_expire(&sw, LIMIT_POWER_WAIT_TIMEOUT_MS); |
| 441 | |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 442 | /* Ensure we have enough power to continue booting. */ |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 443 | while (1) { |
| 444 | if (google_chromeec_read_limit_power_request(&limit_power)) { |
| 445 | printk(BIOS_ERR, "Failed to check EC limit power" |
| 446 | "flag.\n"); |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 447 | return VB2_ERROR_UNKNOWN; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | if (!limit_power || stopwatch_expired(&sw)) |
| 451 | break; |
| 452 | |
| 453 | if (!message_printed) { |
| 454 | printk(BIOS_SPEW, |
| 455 | "Waiting for EC to clear limit power flag.\n"); |
| 456 | message_printed = true; |
| 457 | } |
| 458 | |
| 459 | mdelay(LIMIT_POWER_POLL_SLEEP_MS); |
| 460 | } |
| 461 | |
| 462 | if (limit_power) { |
| 463 | printk(BIOS_INFO, |
| 464 | "EC requests limited power usage. Request shutdown.\n"); |
Yu-Ping Wu | 3032278 | 2020-04-17 18:39:01 +0800 | [diff] [blame] | 465 | return VB2_REQUEST_SHUTDOWN; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 466 | } else { |
| 467 | printk(BIOS_INFO, "Waited %luus to clear limit power flag.\n", |
| 468 | stopwatch_duration_usecs(&sw)); |
| 469 | } |
| 470 | |
Tim Wawrzynczak | f9e7499 | 2019-10-25 14:59:43 -0600 | [diff] [blame] | 471 | return VB2_SUCCESS; |
Tim Wawrzynczak | d6fc557 | 2019-10-25 14:58:15 -0600 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Support battery cutoff if required. |
| 476 | */ |
| 477 | vb2_error_t vb2ex_ec_battery_cutoff(void) |
| 478 | { |
| 479 | if (google_chromeec_battery_cutoff(EC_BATTERY_CUTOFF_FLAG_AT_SHUTDOWN)) |
| 480 | return VB2_ERROR_UNKNOWN; |
| 481 | |
| 482 | return VB2_SUCCESS; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Vboot callback for calculating an EC image's hash. |
| 487 | */ |
| 488 | vb2_error_t vb2ex_ec_hash_image(enum vb2_firmware_selection select, |
| 489 | const uint8_t **hash, int *hash_size) |
| 490 | { |
| 491 | return ec_hash_image(select, hash, hash_size); |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Vboot callback for EC flash protection. |
| 496 | */ |
| 497 | vb2_error_t vb2ex_ec_protect(enum vb2_firmware_selection select) |
| 498 | { |
| 499 | return ec_protect_flash(select, 1); |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Get hash for image. |
| 504 | */ |
| 505 | vb2_error_t vb2ex_ec_get_expected_image_hash(enum vb2_firmware_selection select, |
| 506 | const uint8_t **hash, |
| 507 | int *hash_size) |
| 508 | { |
| 509 | return ec_get_expected_hash(select, hash, hash_size); |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Disable further sysjumps (i.e., stay in RW until next reboot) |
| 514 | */ |
| 515 | vb2_error_t vb2ex_ec_disable_jump(void) |
| 516 | { |
| 517 | if (google_chromeec_reboot(0, EC_REBOOT_DISABLE_JUMP, 0)) |
| 518 | return VB2_ERROR_UNKNOWN; |
| 519 | |
| 520 | return VB2_SUCCESS; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Update EC image. |
| 525 | */ |
| 526 | vb2_error_t vb2ex_ec_update_image(enum vb2_firmware_selection select) |
| 527 | { |
| 528 | return ec_update_image(select); |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Vboot callback for commanding EC to sysjump to RW. |
| 533 | */ |
| 534 | vb2_error_t vb2ex_ec_jump_to_rw(void) |
| 535 | { |
| 536 | struct stopwatch sw; |
| 537 | |
| 538 | if (google_chromeec_reboot(0, EC_REBOOT_JUMP_RW, 0)) |
| 539 | return VB2_ERROR_UNKNOWN; |
| 540 | |
| 541 | /* Give the EC 3 seconds to sysjump */ |
| 542 | stopwatch_init_msecs_expire(&sw, CROS_EC_SYSJUMP_TIMEOUT_MS); |
| 543 | |
| 544 | /* Default delay to wait after EC reboot */ |
| 545 | mdelay(50); |
| 546 | while (google_chromeec_hello()) { |
| 547 | if (stopwatch_expired(&sw)) { |
| 548 | printk(BIOS_ERR, "EC did not return from reboot after %luus\n", |
| 549 | stopwatch_duration_usecs(&sw)); |
| 550 | return VB2_ERROR_UNKNOWN; |
| 551 | } |
| 552 | |
| 553 | mdelay(5); |
| 554 | } |
| 555 | |
| 556 | printk(BIOS_INFO, "\nEC returned from reboot after %luus\n", |
| 557 | stopwatch_duration_usecs(&sw)); |
| 558 | |
| 559 | return VB2_SUCCESS; |
| 560 | } |