1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Chromium OS cros_ec driver 4 * 5 * Copyright (c) 2012 The Chromium OS Authors. 6 */ 7 8 #ifndef _CROS_EC_H 9 #define _CROS_EC_H 10 11 #include <linux/compiler.h> 12 #include <ec_commands.h> 13 #include <cros_ec_message.h> 14 #include <asm/gpio.h> 15 #include <dm/of_extra.h> 16 17 /* Our configuration information */ 18 struct cros_ec_dev { 19 struct udevice *dev; /* Transport device */ 20 struct gpio_desc ec_int; /* GPIO used as EC interrupt line */ 21 int protocol_version; /* Protocol version to use */ 22 int optimise_flash_write; /* Don't write erased flash blocks */ 23 24 /* 25 * These two buffers will always be dword-aligned and include enough 26 * space for up to 7 word-alignment bytes also, so we can ensure that 27 * the body of the message is always dword-aligned (64-bit). 28 * 29 * We use this alignment to keep ARM and x86 happy. Probably word 30 * alignment would be OK, there might be a small performance advantage 31 * to using dword. 32 */ 33 uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] 34 __aligned(sizeof(int64_t)); 35 uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] 36 __aligned(sizeof(int64_t)); 37 }; 38 39 /* 40 * Hard-code the number of columns we happen to know we have right now. It 41 * would be more correct to call cros_ec_info() at startup and determine the 42 * actual number of keyboard cols from there. 43 */ 44 #define CROS_EC_KEYSCAN_COLS 13 45 46 /* Information returned by a key scan */ 47 struct mbkp_keyscan { 48 uint8_t data[CROS_EC_KEYSCAN_COLS]; 49 }; 50 51 /* Holds information about the Chrome EC */ 52 struct fdt_cros_ec { 53 struct fmap_entry flash; /* Address and size of EC flash */ 54 /* 55 * Byte value of erased flash, or -1 if not known. It is normally 56 * 0xff but some flash devices use 0 (e.g. STM32Lxxx) 57 */ 58 int flash_erase_value; 59 struct fmap_entry region[EC_FLASH_REGION_COUNT]; 60 }; 61 62 /** 63 * Read the ID of the CROS-EC device 64 * 65 * The ID is a string identifying the CROS-EC device. 66 * 67 * @param dev CROS-EC device 68 * @param id Place to put the ID 69 * @param maxlen Maximum length of the ID field 70 * @return 0 if ok, -1 on error 71 */ 72 int cros_ec_read_id(struct udevice *dev, char *id, int maxlen); 73 74 /** 75 * Read a keyboard scan from the CROS-EC device 76 * 77 * Send a message requesting a keyboard scan and return the result 78 * 79 * @param dev CROS-EC device 80 * @param scan Place to put the scan results 81 * @return 0 if ok, -1 on error 82 */ 83 int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan); 84 85 /** 86 * Get the next pending MKBP event from the ChromeOS EC device. 87 * 88 * Send a message requesting the next event and return the result. 89 * 90 * @param event Place to put the event. 91 * @return 0 if ok, <0 on error. 92 */ 93 int cros_ec_get_next_event(struct udevice *dev, 94 struct ec_response_get_next_event *event); 95 96 /** 97 * Read which image is currently running on the CROS-EC device. 98 * 99 * @param dev CROS-EC device 100 * @param image Destination for image identifier 101 * @return 0 if ok, <0 on error 102 */ 103 int cros_ec_read_current_image(struct udevice *dev, 104 enum ec_current_image *image); 105 106 /** 107 * Read the hash of the CROS-EC device firmware. 108 * 109 * @param dev CROS-EC device 110 * @param hash_offset Offset in flash to read from 111 * @param hash Destination for hash information 112 * @return 0 if ok, <0 on error 113 */ 114 int cros_ec_read_hash(struct udevice *dev, uint hash_offset, 115 struct ec_response_vboot_hash *hash); 116 117 /** 118 * Send a reboot command to the CROS-EC device. 119 * 120 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP. 121 * 122 * @param dev CROS-EC device 123 * @param cmd Reboot command 124 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*) 125 * @return 0 if ok, <0 on error 126 */ 127 int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags); 128 129 /** 130 * Check if the CROS-EC device has an interrupt pending. 131 * 132 * Read the status of the external interrupt connected to the CROS-EC device. 133 * If no external interrupt is configured, this always returns 1. 134 * 135 * @param dev CROS-EC device 136 * @return 0 if no interrupt is pending 137 */ 138 int cros_ec_interrupt_pending(struct udevice *dev); 139 140 enum { 141 CROS_EC_OK, 142 CROS_EC_ERR = 1, 143 CROS_EC_ERR_FDT_DECODE, 144 CROS_EC_ERR_CHECK_VERSION, 145 CROS_EC_ERR_READ_ID, 146 CROS_EC_ERR_DEV_INIT, 147 }; 148 149 /** 150 * Initialise the Chromium OS EC driver 151 * 152 * @param blob Device tree blob containing setup information 153 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none 154 * @return 0 if we got an cros_ec device and all is well (or no cros_ec is 155 * expected), -ve if we should have an cros_ec device but failed to find 156 * one, or init failed (-CROS_EC_ERR_...). 157 */ 158 int cros_ec_init(const void *blob, struct udevice**cros_ecp); 159 160 /** 161 * Read information about the keyboard matrix 162 * 163 * @param dev CROS-EC device 164 * @param info Place to put the info structure 165 */ 166 int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info); 167 168 /** 169 * Read the host event flags 170 * 171 * @param dev CROS-EC device 172 * @param events_ptr Destination for event flags. Not changed on error. 173 * @return 0 if ok, <0 on error 174 */ 175 int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr); 176 177 /** 178 * Clear the specified host event flags 179 * 180 * @param dev CROS-EC device 181 * @param events Event flags to clear 182 * @return 0 if ok, <0 on error 183 */ 184 int cros_ec_clear_host_events(struct udevice *dev, uint32_t events); 185 186 /** 187 * Get/set flash protection 188 * 189 * @param dev CROS-EC device 190 * @param set_mask Mask of flags to set; if 0, just retrieves existing 191 * protection state without changing it. 192 * @param set_flags New flag values; only bits in set_mask are applied; 193 * ignored if set_mask=0. 194 * @param prot Destination for updated protection state from EC. 195 * @return 0 if ok, <0 on error 196 */ 197 int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask, 198 uint32_t set_flags, 199 struct ec_response_flash_protect *resp); 200 201 /** 202 * Notify EC of current boot mode 203 * 204 * @param dev CROS-EC device 205 * @param vboot_mode Verified boot mode 206 * @return 0 if ok, <0 on error 207 */ 208 int cros_ec_entering_mode(struct udevice *dev, int mode); 209 210 /** 211 * Run internal tests on the cros_ec interface. 212 * 213 * @param dev CROS-EC device 214 * @return 0 if ok, <0 if the test failed 215 */ 216 int cros_ec_test(struct udevice *dev); 217 218 /** 219 * Update the EC RW copy. 220 * 221 * @param dev CROS-EC device 222 * @param image the content to write 223 * @param imafge_size content length 224 * @return 0 if ok, <0 if the test failed 225 */ 226 int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image, 227 int image_size); 228 229 /** 230 * Return a pointer to the board's CROS-EC device 231 * 232 * @return pointer to CROS-EC device, or NULL if none is available 233 */ 234 struct udevice *board_get_cros_ec_dev(void); 235 236 struct dm_cros_ec_ops { 237 /** 238 * check_version() - Check the protocol version being used (optional) 239 * 240 * If provided, this function should check that the EC can be supported 241 * by the driver. If not provided, HELLO messages will be sent to try 242 * to determine the protocol version. 243 * 244 * @dev: Device to check 245 * @return 0 if the protocol is valid, -ve if not supported 246 */ 247 int (*check_version)(struct udevice *dev); 248 249 /** 250 * command() - Old-style command interface 251 * 252 * This sends a command and receives a response (deprecated, use 253 * packet()) 254 * 255 * @dev: Device to use 256 * @cmd: Command to send (only supports 0-0xff) 257 * @cmd_version: Version of command to send (often 0) 258 * @dout: Output data (may be NULL If dout_len=0) 259 * @dout_len: Length of output data excluding 4-byte header 260 * @dinp: On input, set to point to input data, often struct 261 * cros_ec_dev->din - typically this is left alone but may be 262 * updated by the driver 263 * @din_len: Maximum length of response 264 * @return number of bytes in response, or -ve on error 265 */ 266 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version, 267 const uint8_t *dout, int dout_len, 268 uint8_t **dinp, int din_len); 269 270 /** 271 * packet() - New-style command interface 272 * 273 * This interface is preferred over command(), since it is typically 274 * easier to implement. 275 * 276 * @dev: Device to use 277 * @out_bytes: Number of bytes to send (from struct cros_ec_dev->dout) 278 * @in_bytes: Maximum number of bytes to expect in response 279 * @return number of bytes in response, or -ve on error 280 */ 281 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes); 282 283 /** 284 * get_switches() - Get value of EC switches 285 * 286 * This is currently supported on the LPC EC. 287 * 288 * @dev: Device to use 289 * @return current switches value, or -ENOSYS if not supported 290 */ 291 int (*get_switches)(struct udevice *dev); 292 }; 293 294 #define dm_cros_ec_get_ops(dev) \ 295 ((struct dm_cros_ec_ops *)(dev)->driver->ops) 296 297 int cros_ec_register(struct udevice *dev); 298 299 /** 300 * Dump a block of data for a command. 301 * 302 * @param name Name for data (e.g. 'in', 'out') 303 * @param cmd Command number associated with data, or -1 for none 304 * @param data Data block to dump 305 * @param len Length of data block to dump 306 */ 307 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len); 308 309 /** 310 * Calculate a simple 8-bit checksum of a data block 311 * 312 * @param data Data block to checksum 313 * @param size Size of data block in bytes 314 * @return checksum value (0 to 255) 315 */ 316 int cros_ec_calc_checksum(const uint8_t *data, int size); 317 318 int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size); 319 320 /** 321 * Read data from the flash 322 * 323 * Read an arbitrary amount of data from the EC flash, by repeatedly reading 324 * small blocks. 325 * 326 * The offset starts at 0. You can obtain the region information from 327 * cros_ec_flash_offset() to find out where to read for a particular region. 328 * 329 * @param dev CROS-EC device 330 * @param data Pointer to data buffer to read into 331 * @param offset Offset within flash to read from 332 * @param size Number of bytes to read 333 * @return 0 if ok, -1 on error 334 */ 335 int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset, 336 uint32_t size); 337 338 /** 339 * Read back flash parameters 340 * 341 * This function reads back parameters of the flash as reported by the EC 342 * 343 * @param dev Pointer to device 344 * @param info Pointer to output flash info struct 345 */ 346 int cros_ec_read_flashinfo(struct udevice *dev, 347 struct ec_response_flash_info *info); 348 349 /** 350 * Write data to the flash 351 * 352 * Write an arbitrary amount of data to the EC flash, by repeatedly writing 353 * small blocks. 354 * 355 * The offset starts at 0. You can obtain the region information from 356 * cros_ec_flash_offset() to find out where to write for a particular region. 357 * 358 * Attempting to write to the region where the EC is currently running from 359 * will result in an error. 360 * 361 * @param dev CROS-EC device 362 * @param data Pointer to data buffer to write 363 * @param offset Offset within flash to write to. 364 * @param size Number of bytes to write 365 * @return 0 if ok, -1 on error 366 */ 367 int cros_ec_flash_write(struct udevice *dev, const uint8_t *data, 368 uint32_t offset, uint32_t size); 369 370 /** 371 * Obtain position and size of a flash region 372 * 373 * @param dev CROS-EC device 374 * @param region Flash region to query 375 * @param offset Returns offset of flash region in EC flash 376 * @param size Returns size of flash region 377 * @return 0 if ok, -1 on error 378 */ 379 int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region, 380 uint32_t *offset, uint32_t *size); 381 382 /** 383 * cros_ec_get_sku_id() - Read the SKU ID 384 * 385 * @dev: CROS-EC device 386 * return SKU ID, or -ve on error 387 */ 388 int cros_ec_get_sku_id(struct udevice *dev); 389 390 /** 391 * Read/write non-volatile data from/to a CROS-EC device. 392 * 393 * @param dev CROS-EC device 394 * @param block Buffer of VbNvContext to be read/write 395 * @return 0 if ok, -1 on error 396 */ 397 int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size); 398 int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size); 399 400 /** 401 * Read the version information for the EC images 402 * 403 * @param dev CROS-EC device 404 * @param versionp This is set to point to the version information 405 * @return 0 if ok, -1 on error 406 */ 407 int cros_ec_read_version(struct udevice *dev, 408 struct ec_response_get_version **versionp); 409 410 /** 411 * Read the build information for the EC 412 * 413 * @param dev CROS-EC device 414 * @param versionp This is set to point to the build string 415 * @return 0 if ok, -1 on error 416 */ 417 int cros_ec_read_build_info(struct udevice *dev, char **strp); 418 419 /** 420 * Switch on/off a LDO / FET. 421 * 422 * @param dev CROS-EC device 423 * @param index index of the LDO/FET to switch 424 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF 425 * @return 0 if ok, -1 on error 426 */ 427 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state); 428 429 /** 430 * Read back a LDO / FET current state. 431 * 432 * @param dev CROS-EC device 433 * @param index index of the LDO/FET to switch 434 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF 435 * @return 0 if ok, -1 on error 436 */ 437 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state); 438 439 /** 440 * Get access to the error reported when cros_ec_board_init() was called 441 * 442 * This permits delayed reporting of the EC error if it failed during 443 * early init. 444 * 445 * @return error (0 if there was no error, -ve if there was an error) 446 */ 447 int cros_ec_get_error(void); 448 449 /** 450 * Returns information from the FDT about the Chrome EC flash 451 * 452 * @param dev Device to read from 453 * @param config Structure to use to return information 454 */ 455 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config); 456 457 /** 458 * Check the current keyboard state, in case recovery mode is requested. 459 * This function is for sandbox only. 460 * 461 * @param ec CROS-EC device 462 */ 463 void cros_ec_check_keyboard(struct udevice *dev); 464 465 struct i2c_msg; 466 /* 467 * Tunnel an I2C transfer to the EC 468 * 469 * @param dev CROS-EC device 470 * @param port The remote port on EC to use 471 * @param msg List of messages to transfer 472 * @param nmsgs Number of messages to transfer 473 */ 474 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg, 475 int nmsgs); 476 477 /** 478 * cros_ec_get_events_b() - Get event mask B 479 * 480 * @return value of event mask, default value of 0 if it could not be read 481 */ 482 uint64_t cros_ec_get_events_b(struct udevice *dev); 483 484 /** 485 * cros_ec_clear_events_b() - Clear even mask B 486 * 487 * Any pending events in the B range are cleared 488 * 489 * @return 0 if OK, -ve on error 490 */ 491 int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask); 492 493 /** 494 * cros_ec_efs_verify() - tell the EC to verify one of its images 495 * 496 * @param dev CROS-EC device 497 * @param region Flash region to query 498 * @return 0 if OK, -ve on error 499 */ 500 int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region); 501 502 /** 503 * cros_ec_battery_cutoff() - Request that the battery be cut off 504 * 505 * This tells the battery to stop supplying power. This is used before shipping 506 * a device to ensure that the battery remains charged while the device is 507 * shipped or sitting on the shelf waiting to be purchased. 508 * 509 * @param dev CROS-EC device 510 * @param flags Flags to use (EC_BATTERY_CUTOFF_FLAG_...) 511 * @return 0 if OK, -ve on error 512 */ 513 int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags); 514 515 /** 516 * cros_ec_read_limit_power() - Check if power is limited by batter/charger 517 * 518 * Sometimes the battery is low and / or the device is connected to a charger 519 * that cannot supply much power. 520 * 521 * @param dev CROS-EC device 522 * @param limit_powerp Returns whether power is limited (0 or 1) 523 * @return 0 if OK, -ENOSYS if the EC does not support this comment, -EINVAL 524 * if the EC returned an invalid response 525 */ 526 int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp); 527 528 /** 529 * cros_ec_config_powerbtn() - Configure the behaviour of the power button 530 * 531 * @param dev CROS-EC device 532 * @param flags Flags to use (EC_POWER_BUTTON_...) 533 * @return 0 if OK, -ve on error 534 */ 535 int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags); 536 537 /** 538 * cros_ec_get_lid_shutdown_mask() - Set the lid shutdown mask 539 * 540 * Determines whether a lid close event is reported 541 * 542 * @param dev CROS-EC device 543 * @return shufdown mas if OK, -ve on error 544 */ 545 int cros_ec_get_lid_shutdown_mask(struct udevice *dev); 546 547 /** 548 * cros_ec_set_lid_shutdown_mask() - Set the lid shutdown mask 549 * 550 * Set whether a lid close event is reported 551 * 552 * @param dev CROS-EC device 553 * @param enable true to enable reporting, false to disable 554 * @return shufdown mas if OK, -ve on error 555 */ 556 int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable); 557 558 /** 559 * cros_ec_hello() - Send a hello message 560 * 561 * Sends a message with a fixed input value and checks that the expected output 562 * value is received 563 * 564 * @dev: CROS-EC device 565 * @handshakep: If non-NULL, returns received handshake value on error 566 * @return 0 if OK, -ve on error 567 */ 568 int cros_ec_hello(struct udevice *dev, uint *handshakep); 569 570 /** 571 * cros_ec_get_features() - Get the set of features provided by the EC 572 * 573 * See enum ec_feature_code for the list of available features 574 * 575 * @dev: CROS-EC device 576 * @featuresp: Returns a bitmask of supported features 577 * @return 0 if OK, -ve on error 578 */ 579 int cros_ec_get_features(struct udevice *dev, u64 *featuresp); 580 581 /** 582 * cros_ec_check_feature() - Check if a feature is supported 583 * 584 * @dev: CROS-EC device 585 * @feature: Feature number to check (enum ec_feature_code) 586 * @return true if supported, false if not, -ve on error 587 */ 588 int cros_ec_check_feature(struct udevice *dev, uint feature); 589 590 /** 591 * cros_ec_get_switches() - Get switches value 592 * 593 * @dev: CROS-EC device 594 * @return switches value, or -ENOSYS if not supported, or other -ve value on 595 * other error 596 */ 597 int cros_ec_get_switches(struct udevice *dev); 598 599 /** 600 * cros_ec_vstore_supported() - Check if vstore is supported 601 * 602 * @dev: CROS-EC device 603 * @return false if not supported, true if supported, -ve on error 604 */ 605 int cros_ec_vstore_supported(struct udevice *dev); 606 607 /** 608 * cros_ec_vstore_info() - Get vstore information 609 * 610 * @dev: CROS-EC device 611 * @lockedp: mask of locked slots 612 * @return number of vstore slots supported by the EC,, -ve on error 613 */ 614 int cros_ec_vstore_info(struct udevice *dev, u32 *lockedp); 615 616 /** 617 * cros_ec_vstore_read() - Read data from EC vstore slot 618 * 619 * @dev: CROS-EC device 620 * @slot: vstore slot to read from 621 * @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes 622 * @return 0 if OK, -ve on error 623 */ 624 int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data); 625 626 /** 627 * cros_ec_vstore_write() - Save data into EC vstore slot 628 * 629 * The maximum size of data is EC_VSTORE_SLOT_SIZE. It is the caller's 630 * responsibility to check the number of implemented slots by querying the 631 * vstore info. 632 * 633 * @dev: CROS-EC device 634 * @slot: vstore slot to write into 635 * @data: data to write 636 * @size: size of data in bytes 637 * @return 0 if OK, -ve on error 638 */ 639 int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data, 640 size_t size); 641 642 #endif 643