1 /* 2 * Chromium OS cros_ec driver 3 * 4 * Copyright (c) 2012 The Chromium OS Authors. 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #ifndef _CROS_EC_H 10 #define _CROS_EC_H 11 12 #include <linux/compiler.h> 13 #include <ec_commands.h> 14 #include <fdtdec.h> 15 #include <cros_ec_message.h> 16 #include <asm/gpio.h> 17 18 /* Our configuration information */ 19 struct cros_ec_dev { 20 struct udevice *dev; /* Transport device */ 21 struct gpio_desc ec_int; /* GPIO used as EC interrupt line */ 22 int protocol_version; /* Protocol version to use */ 23 int optimise_flash_write; /* Don't write erased flash blocks */ 24 25 /* 26 * These two buffers will always be dword-aligned and include enough 27 * space for up to 7 word-alignment bytes also, so we can ensure that 28 * the body of the message is always dword-aligned (64-bit). 29 * 30 * We use this alignment to keep ARM and x86 happy. Probably word 31 * alignment would be OK, there might be a small performance advantage 32 * to using dword. 33 */ 34 uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] 35 __aligned(sizeof(int64_t)); 36 uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] 37 __aligned(sizeof(int64_t)); 38 }; 39 40 /* 41 * Hard-code the number of columns we happen to know we have right now. It 42 * would be more correct to call cros_ec_info() at startup and determine the 43 * actual number of keyboard cols from there. 44 */ 45 #define CROS_EC_KEYSCAN_COLS 13 46 47 /* Information returned by a key scan */ 48 struct mbkp_keyscan { 49 uint8_t data[CROS_EC_KEYSCAN_COLS]; 50 }; 51 52 /* Holds information about the Chrome EC */ 53 struct fdt_cros_ec { 54 struct fmap_entry flash; /* Address and size of EC flash */ 55 /* 56 * Byte value of erased flash, or -1 if not known. It is normally 57 * 0xff but some flash devices use 0 (e.g. STM32Lxxx) 58 */ 59 int flash_erase_value; 60 struct fmap_entry region[EC_FLASH_REGION_COUNT]; 61 }; 62 63 /** 64 * Read the ID of the CROS-EC device 65 * 66 * The ID is a string identifying the CROS-EC device. 67 * 68 * @param dev CROS-EC device 69 * @param id Place to put the ID 70 * @param maxlen Maximum length of the ID field 71 * @return 0 if ok, -1 on error 72 */ 73 int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen); 74 75 /** 76 * Read a keyboard scan from the CROS-EC device 77 * 78 * Send a message requesting a keyboard scan and return the result 79 * 80 * @param dev CROS-EC device 81 * @param scan Place to put the scan results 82 * @return 0 if ok, -1 on error 83 */ 84 int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan); 85 86 /** 87 * Read which image is currently running on the CROS-EC device. 88 * 89 * @param dev CROS-EC device 90 * @param image Destination for image identifier 91 * @return 0 if ok, <0 on error 92 */ 93 int cros_ec_read_current_image(struct cros_ec_dev *dev, 94 enum ec_current_image *image); 95 96 /** 97 * Read the hash of the CROS-EC device firmware. 98 * 99 * @param dev CROS-EC device 100 * @param hash Destination for hash information 101 * @return 0 if ok, <0 on error 102 */ 103 int cros_ec_read_hash(struct cros_ec_dev *dev, 104 struct ec_response_vboot_hash *hash); 105 106 /** 107 * Send a reboot command to the CROS-EC device. 108 * 109 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP. 110 * 111 * @param dev CROS-EC device 112 * @param cmd Reboot command 113 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*) 114 * @return 0 if ok, <0 on error 115 */ 116 int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd, 117 uint8_t flags); 118 119 /** 120 * Check if the CROS-EC device has an interrupt pending. 121 * 122 * Read the status of the external interrupt connected to the CROS-EC device. 123 * If no external interrupt is configured, this always returns 1. 124 * 125 * @param dev CROS-EC device 126 * @return 0 if no interrupt is pending 127 */ 128 int cros_ec_interrupt_pending(struct cros_ec_dev *dev); 129 130 enum { 131 CROS_EC_OK, 132 CROS_EC_ERR = 1, 133 CROS_EC_ERR_FDT_DECODE, 134 CROS_EC_ERR_CHECK_VERSION, 135 CROS_EC_ERR_READ_ID, 136 CROS_EC_ERR_DEV_INIT, 137 }; 138 139 /** 140 * Initialise the Chromium OS EC driver 141 * 142 * @param blob Device tree blob containing setup information 143 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none 144 * @return 0 if we got an cros_ec device and all is well (or no cros_ec is 145 * expected), -ve if we should have an cros_ec device but failed to find 146 * one, or init failed (-CROS_EC_ERR_...). 147 */ 148 int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp); 149 150 /** 151 * Read information about the keyboard matrix 152 * 153 * @param dev CROS-EC device 154 * @param info Place to put the info structure 155 */ 156 int cros_ec_info(struct cros_ec_dev *dev, 157 struct ec_response_mkbp_info *info); 158 159 /** 160 * Read the host event flags 161 * 162 * @param dev CROS-EC device 163 * @param events_ptr Destination for event flags. Not changed on error. 164 * @return 0 if ok, <0 on error 165 */ 166 int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr); 167 168 /** 169 * Clear the specified host event flags 170 * 171 * @param dev CROS-EC device 172 * @param events Event flags to clear 173 * @return 0 if ok, <0 on error 174 */ 175 int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events); 176 177 /** 178 * Get/set flash protection 179 * 180 * @param dev CROS-EC device 181 * @param set_mask Mask of flags to set; if 0, just retrieves existing 182 * protection state without changing it. 183 * @param set_flags New flag values; only bits in set_mask are applied; 184 * ignored if set_mask=0. 185 * @param prot Destination for updated protection state from EC. 186 * @return 0 if ok, <0 on error 187 */ 188 int cros_ec_flash_protect(struct cros_ec_dev *dev, 189 uint32_t set_mask, uint32_t set_flags, 190 struct ec_response_flash_protect *resp); 191 192 193 /** 194 * Run internal tests on the cros_ec interface. 195 * 196 * @param dev CROS-EC device 197 * @return 0 if ok, <0 if the test failed 198 */ 199 int cros_ec_test(struct cros_ec_dev *dev); 200 201 /** 202 * Update the EC RW copy. 203 * 204 * @param dev CROS-EC device 205 * @param image the content to write 206 * @param imafge_size content length 207 * @return 0 if ok, <0 if the test failed 208 */ 209 int cros_ec_flash_update_rw(struct cros_ec_dev *dev, 210 const uint8_t *image, int image_size); 211 212 /** 213 * Return a pointer to the board's CROS-EC device 214 * 215 * This should be implemented by board files. 216 * 217 * @return pointer to CROS-EC device, or NULL if none is available 218 */ 219 struct cros_ec_dev *board_get_cros_ec_dev(void); 220 221 struct dm_cros_ec_ops { 222 int (*check_version)(struct udevice *dev); 223 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version, 224 const uint8_t *dout, int dout_len, 225 uint8_t **dinp, int din_len); 226 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes); 227 }; 228 229 #define dm_cros_ec_get_ops(dev) \ 230 ((struct dm_cros_ec_ops *)(dev)->driver->ops) 231 232 int cros_ec_register(struct udevice *dev); 233 234 /** 235 * Dump a block of data for a command. 236 * 237 * @param name Name for data (e.g. 'in', 'out') 238 * @param cmd Command number associated with data, or -1 for none 239 * @param data Data block to dump 240 * @param len Length of data block to dump 241 */ 242 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len); 243 244 /** 245 * Calculate a simple 8-bit checksum of a data block 246 * 247 * @param data Data block to checksum 248 * @param size Size of data block in bytes 249 * @return checksum value (0 to 255) 250 */ 251 int cros_ec_calc_checksum(const uint8_t *data, int size); 252 253 /** 254 * Decode a flash region parameter 255 * 256 * @param argc Number of params remaining 257 * @param argv List of remaining parameters 258 * @return flash region (EC_FLASH_REGION_...) or -1 on error 259 */ 260 int cros_ec_decode_region(int argc, char * const argv[]); 261 262 int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset, 263 uint32_t size); 264 265 /** 266 * Read data from the flash 267 * 268 * Read an arbitrary amount of data from the EC flash, by repeatedly reading 269 * small blocks. 270 * 271 * The offset starts at 0. You can obtain the region information from 272 * cros_ec_flash_offset() to find out where to read for a particular region. 273 * 274 * @param dev CROS-EC device 275 * @param data Pointer to data buffer to read into 276 * @param offset Offset within flash to read from 277 * @param size Number of bytes to read 278 * @return 0 if ok, -1 on error 279 */ 280 int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset, 281 uint32_t size); 282 283 /** 284 * Write data to the flash 285 * 286 * Write an arbitrary amount of data to the EC flash, by repeatedly writing 287 * small blocks. 288 * 289 * The offset starts at 0. You can obtain the region information from 290 * cros_ec_flash_offset() to find out where to write for a particular region. 291 * 292 * Attempting to write to the region where the EC is currently running from 293 * will result in an error. 294 * 295 * @param dev CROS-EC device 296 * @param data Pointer to data buffer to write 297 * @param offset Offset within flash to write to. 298 * @param size Number of bytes to write 299 * @return 0 if ok, -1 on error 300 */ 301 int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data, 302 uint32_t offset, uint32_t size); 303 304 /** 305 * Obtain position and size of a flash region 306 * 307 * @param dev CROS-EC device 308 * @param region Flash region to query 309 * @param offset Returns offset of flash region in EC flash 310 * @param size Returns size of flash region 311 * @return 0 if ok, -1 on error 312 */ 313 int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region, 314 uint32_t *offset, uint32_t *size); 315 316 /** 317 * Read/write VbNvContext from/to a CROS-EC device. 318 * 319 * @param dev CROS-EC device 320 * @param block Buffer of VbNvContext to be read/write 321 * @return 0 if ok, -1 on error 322 */ 323 int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block); 324 int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block); 325 326 /** 327 * Read the version information for the EC images 328 * 329 * @param dev CROS-EC device 330 * @param versionp This is set to point to the version information 331 * @return 0 if ok, -1 on error 332 */ 333 int cros_ec_read_version(struct cros_ec_dev *dev, 334 struct ec_response_get_version **versionp); 335 336 /** 337 * Read the build information for the EC 338 * 339 * @param dev CROS-EC device 340 * @param versionp This is set to point to the build string 341 * @return 0 if ok, -1 on error 342 */ 343 int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp); 344 345 /** 346 * Switch on/off a LDO / FET. 347 * 348 * @param dev CROS-EC device 349 * @param index index of the LDO/FET to switch 350 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF 351 * @return 0 if ok, -1 on error 352 */ 353 int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state); 354 355 /** 356 * Read back a LDO / FET current state. 357 * 358 * @param dev CROS-EC device 359 * @param index index of the LDO/FET to switch 360 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF 361 * @return 0 if ok, -1 on error 362 */ 363 int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state); 364 365 /** 366 * Get access to the error reported when cros_ec_board_init() was called 367 * 368 * This permits delayed reporting of the EC error if it failed during 369 * early init. 370 * 371 * @return error (0 if there was no error, -ve if there was an error) 372 */ 373 int cros_ec_get_error(void); 374 375 /** 376 * Returns information from the FDT about the Chrome EC flash 377 * 378 * @param blob FDT blob to use 379 * @param node Node offset to read from 380 * @param config Structure to use to return information 381 */ 382 int cros_ec_decode_ec_flash(const void *blob, int node, 383 struct fdt_cros_ec *config); 384 385 /** 386 * Check the current keyboard state, in case recovery mode is requested. 387 * This function is for sandbox only. 388 * 389 * @param ec CROS-EC device 390 */ 391 void cros_ec_check_keyboard(struct cros_ec_dev *dev); 392 393 /* 394 * Tunnel an I2C transfer to the EC 395 * 396 * @param dev CROS-EC device 397 * @param chip Chip address (7-bit I2C address) 398 * @param addr Register address to read/write 399 * @param alen Length of register address in bytes 400 * @param buffer Buffer containing data to read/write 401 * @param len Length of buffer 402 * @param is_read 1 if this is a read, 0 if this is a write 403 */ 404 int cros_ec_i2c_xfer(struct cros_ec_dev *dev, uchar chip, uint addr, 405 int alen, uchar *buffer, int len, int is_read); 406 407 #endif 408