1 /* 2 * ipmi_smic_sm.c 3 * 4 * The state-machine driver for an IPMI SMIC driver 5 * 6 * It started as a copy of Corey Minyard's driver for the KSC interface 7 * and the kernel patch "mmcdev-patch-245" by HP 8 * 9 * modified by: Hannes Schulz <schulz@schwaar.com> 10 * ipmi@schwaar.com 11 * 12 * 13 * Corey Minyard's driver for the KSC interface has the following 14 * copyright notice: 15 * Copyright 2002 MontaVista Software Inc. 16 * 17 * the kernel patch "mmcdev-patch-245" by HP has the following 18 * copyright notice: 19 * (c) Copyright 2001 Grant Grundler (c) Copyright 20 * 2001 Hewlett-Packard Company 21 * 22 * 23 * This program is free software; you can redistribute it and/or modify it 24 * under the terms of the GNU General Public License as published by the 25 * Free Software Foundation; either version 2 of the License, or (at your 26 * option) any later version. 27 * 28 * 29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 31 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 34 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 35 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 36 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 37 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 38 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * You should have received a copy of the GNU General Public License along 41 * with this program; if not, write to the Free Software Foundation, Inc., 42 * 675 Mass Ave, Cambridge, MA 02139, USA. */ 43 44 #include <linux/kernel.h> /* For printk. */ 45 #include <linux/string.h> 46 #include <linux/module.h> 47 #include <linux/moduleparam.h> 48 #include <linux/ipmi_msgdefs.h> /* for completion codes */ 49 #include "ipmi_si_sm.h" 50 51 /* smic_debug is a bit-field 52 * SMIC_DEBUG_ENABLE - turned on for now 53 * SMIC_DEBUG_MSG - commands and their responses 54 * SMIC_DEBUG_STATES - state machine 55 */ 56 #define SMIC_DEBUG_STATES 4 57 #define SMIC_DEBUG_MSG 2 58 #define SMIC_DEBUG_ENABLE 1 59 60 static int smic_debug = 1; 61 module_param(smic_debug, int, 0644); 62 MODULE_PARM_DESC(smic_debug, "debug bitmask, 1=enable, 2=messages, 4=states"); 63 64 enum smic_states { 65 SMIC_IDLE, 66 SMIC_START_OP, 67 SMIC_OP_OK, 68 SMIC_WRITE_START, 69 SMIC_WRITE_NEXT, 70 SMIC_WRITE_END, 71 SMIC_WRITE2READ, 72 SMIC_READ_START, 73 SMIC_READ_NEXT, 74 SMIC_READ_END, 75 SMIC_HOSED 76 }; 77 78 #define MAX_SMIC_READ_SIZE 80 79 #define MAX_SMIC_WRITE_SIZE 80 80 #define SMIC_MAX_ERROR_RETRIES 3 81 82 /* Timeouts in microseconds. */ 83 #define SMIC_RETRY_TIMEOUT (2*USEC_PER_SEC) 84 85 /* SMIC Flags Register Bits */ 86 #define SMIC_RX_DATA_READY 0x80 87 #define SMIC_TX_DATA_READY 0x40 88 89 /* 90 * SMIC_SMI and SMIC_EVM_DATA_AVAIL are only used by 91 * a few systems, and then only by Systems Management 92 * Interrupts, not by the OS. Always ignore these bits. 93 * 94 */ 95 #define SMIC_SMI 0x10 96 #define SMIC_EVM_DATA_AVAIL 0x08 97 #define SMIC_SMS_DATA_AVAIL 0x04 98 #define SMIC_FLAG_BSY 0x01 99 100 /* SMIC Error Codes */ 101 #define EC_NO_ERROR 0x00 102 #define EC_ABORTED 0x01 103 #define EC_ILLEGAL_CONTROL 0x02 104 #define EC_NO_RESPONSE 0x03 105 #define EC_ILLEGAL_COMMAND 0x04 106 #define EC_BUFFER_FULL 0x05 107 108 struct si_sm_data { 109 enum smic_states state; 110 struct si_sm_io *io; 111 unsigned char write_data[MAX_SMIC_WRITE_SIZE]; 112 int write_pos; 113 int write_count; 114 int orig_write_count; 115 unsigned char read_data[MAX_SMIC_READ_SIZE]; 116 int read_pos; 117 int truncated; 118 unsigned int error_retries; 119 long smic_timeout; 120 }; 121 122 static unsigned int init_smic_data(struct si_sm_data *smic, 123 struct si_sm_io *io) 124 { 125 smic->state = SMIC_IDLE; 126 smic->io = io; 127 smic->write_pos = 0; 128 smic->write_count = 0; 129 smic->orig_write_count = 0; 130 smic->read_pos = 0; 131 smic->error_retries = 0; 132 smic->truncated = 0; 133 smic->smic_timeout = SMIC_RETRY_TIMEOUT; 134 135 /* We use 3 bytes of I/O. */ 136 return 3; 137 } 138 139 static int start_smic_transaction(struct si_sm_data *smic, 140 unsigned char *data, unsigned int size) 141 { 142 unsigned int i; 143 144 if (size < 2) 145 return IPMI_REQ_LEN_INVALID_ERR; 146 if (size > MAX_SMIC_WRITE_SIZE) 147 return IPMI_REQ_LEN_EXCEEDED_ERR; 148 149 if ((smic->state != SMIC_IDLE) && (smic->state != SMIC_HOSED)) 150 return IPMI_NOT_IN_MY_STATE_ERR; 151 152 if (smic_debug & SMIC_DEBUG_MSG) { 153 printk(KERN_DEBUG "start_smic_transaction -"); 154 for (i = 0; i < size; i++) 155 printk(" %02x", (unsigned char) data[i]); 156 printk("\n"); 157 } 158 smic->error_retries = 0; 159 memcpy(smic->write_data, data, size); 160 smic->write_count = size; 161 smic->orig_write_count = size; 162 smic->write_pos = 0; 163 smic->read_pos = 0; 164 smic->state = SMIC_START_OP; 165 smic->smic_timeout = SMIC_RETRY_TIMEOUT; 166 return 0; 167 } 168 169 static int smic_get_result(struct si_sm_data *smic, 170 unsigned char *data, unsigned int length) 171 { 172 int i; 173 174 if (smic_debug & SMIC_DEBUG_MSG) { 175 printk(KERN_DEBUG "smic_get result -"); 176 for (i = 0; i < smic->read_pos; i++) 177 printk(" %02x", smic->read_data[i]); 178 printk("\n"); 179 } 180 if (length < smic->read_pos) { 181 smic->read_pos = length; 182 smic->truncated = 1; 183 } 184 memcpy(data, smic->read_data, smic->read_pos); 185 186 if ((length >= 3) && (smic->read_pos < 3)) { 187 data[2] = IPMI_ERR_UNSPECIFIED; 188 smic->read_pos = 3; 189 } 190 if (smic->truncated) { 191 data[2] = IPMI_ERR_MSG_TRUNCATED; 192 smic->truncated = 0; 193 } 194 return smic->read_pos; 195 } 196 197 static inline unsigned char read_smic_flags(struct si_sm_data *smic) 198 { 199 return smic->io->inputb(smic->io, 2); 200 } 201 202 static inline unsigned char read_smic_status(struct si_sm_data *smic) 203 { 204 return smic->io->inputb(smic->io, 1); 205 } 206 207 static inline unsigned char read_smic_data(struct si_sm_data *smic) 208 { 209 return smic->io->inputb(smic->io, 0); 210 } 211 212 static inline void write_smic_flags(struct si_sm_data *smic, 213 unsigned char flags) 214 { 215 smic->io->outputb(smic->io, 2, flags); 216 } 217 218 static inline void write_smic_control(struct si_sm_data *smic, 219 unsigned char control) 220 { 221 smic->io->outputb(smic->io, 1, control); 222 } 223 224 static inline void write_si_sm_data(struct si_sm_data *smic, 225 unsigned char data) 226 { 227 smic->io->outputb(smic->io, 0, data); 228 } 229 230 static inline void start_error_recovery(struct si_sm_data *smic, char *reason) 231 { 232 (smic->error_retries)++; 233 if (smic->error_retries > SMIC_MAX_ERROR_RETRIES) { 234 if (smic_debug & SMIC_DEBUG_ENABLE) 235 printk(KERN_WARNING 236 "ipmi_smic_drv: smic hosed: %s\n", reason); 237 smic->state = SMIC_HOSED; 238 } else { 239 smic->write_count = smic->orig_write_count; 240 smic->write_pos = 0; 241 smic->read_pos = 0; 242 smic->state = SMIC_START_OP; 243 smic->smic_timeout = SMIC_RETRY_TIMEOUT; 244 } 245 } 246 247 static inline void write_next_byte(struct si_sm_data *smic) 248 { 249 write_si_sm_data(smic, smic->write_data[smic->write_pos]); 250 (smic->write_pos)++; 251 (smic->write_count)--; 252 } 253 254 static inline void read_next_byte(struct si_sm_data *smic) 255 { 256 if (smic->read_pos >= MAX_SMIC_READ_SIZE) { 257 read_smic_data(smic); 258 smic->truncated = 1; 259 } else { 260 smic->read_data[smic->read_pos] = read_smic_data(smic); 261 smic->read_pos++; 262 } 263 } 264 265 /* SMIC Control/Status Code Components */ 266 #define SMIC_GET_STATUS 0x00 /* Control form's name */ 267 #define SMIC_READY 0x00 /* Status form's name */ 268 #define SMIC_WR_START 0x01 /* Unified Control/Status names... */ 269 #define SMIC_WR_NEXT 0x02 270 #define SMIC_WR_END 0x03 271 #define SMIC_RD_START 0x04 272 #define SMIC_RD_NEXT 0x05 273 #define SMIC_RD_END 0x06 274 #define SMIC_CODE_MASK 0x0f 275 276 #define SMIC_CONTROL 0x00 277 #define SMIC_STATUS 0x80 278 #define SMIC_CS_MASK 0x80 279 280 #define SMIC_SMS 0x40 281 #define SMIC_SMM 0x60 282 #define SMIC_STREAM_MASK 0x60 283 284 /* SMIC Control Codes */ 285 #define SMIC_CC_SMS_GET_STATUS (SMIC_CONTROL|SMIC_SMS|SMIC_GET_STATUS) 286 #define SMIC_CC_SMS_WR_START (SMIC_CONTROL|SMIC_SMS|SMIC_WR_START) 287 #define SMIC_CC_SMS_WR_NEXT (SMIC_CONTROL|SMIC_SMS|SMIC_WR_NEXT) 288 #define SMIC_CC_SMS_WR_END (SMIC_CONTROL|SMIC_SMS|SMIC_WR_END) 289 #define SMIC_CC_SMS_RD_START (SMIC_CONTROL|SMIC_SMS|SMIC_RD_START) 290 #define SMIC_CC_SMS_RD_NEXT (SMIC_CONTROL|SMIC_SMS|SMIC_RD_NEXT) 291 #define SMIC_CC_SMS_RD_END (SMIC_CONTROL|SMIC_SMS|SMIC_RD_END) 292 293 #define SMIC_CC_SMM_GET_STATUS (SMIC_CONTROL|SMIC_SMM|SMIC_GET_STATUS) 294 #define SMIC_CC_SMM_WR_START (SMIC_CONTROL|SMIC_SMM|SMIC_WR_START) 295 #define SMIC_CC_SMM_WR_NEXT (SMIC_CONTROL|SMIC_SMM|SMIC_WR_NEXT) 296 #define SMIC_CC_SMM_WR_END (SMIC_CONTROL|SMIC_SMM|SMIC_WR_END) 297 #define SMIC_CC_SMM_RD_START (SMIC_CONTROL|SMIC_SMM|SMIC_RD_START) 298 #define SMIC_CC_SMM_RD_NEXT (SMIC_CONTROL|SMIC_SMM|SMIC_RD_NEXT) 299 #define SMIC_CC_SMM_RD_END (SMIC_CONTROL|SMIC_SMM|SMIC_RD_END) 300 301 /* SMIC Status Codes */ 302 #define SMIC_SC_SMS_READY (SMIC_STATUS|SMIC_SMS|SMIC_READY) 303 #define SMIC_SC_SMS_WR_START (SMIC_STATUS|SMIC_SMS|SMIC_WR_START) 304 #define SMIC_SC_SMS_WR_NEXT (SMIC_STATUS|SMIC_SMS|SMIC_WR_NEXT) 305 #define SMIC_SC_SMS_WR_END (SMIC_STATUS|SMIC_SMS|SMIC_WR_END) 306 #define SMIC_SC_SMS_RD_START (SMIC_STATUS|SMIC_SMS|SMIC_RD_START) 307 #define SMIC_SC_SMS_RD_NEXT (SMIC_STATUS|SMIC_SMS|SMIC_RD_NEXT) 308 #define SMIC_SC_SMS_RD_END (SMIC_STATUS|SMIC_SMS|SMIC_RD_END) 309 310 #define SMIC_SC_SMM_READY (SMIC_STATUS|SMIC_SMM|SMIC_READY) 311 #define SMIC_SC_SMM_WR_START (SMIC_STATUS|SMIC_SMM|SMIC_WR_START) 312 #define SMIC_SC_SMM_WR_NEXT (SMIC_STATUS|SMIC_SMM|SMIC_WR_NEXT) 313 #define SMIC_SC_SMM_WR_END (SMIC_STATUS|SMIC_SMM|SMIC_WR_END) 314 #define SMIC_SC_SMM_RD_START (SMIC_STATUS|SMIC_SMM|SMIC_RD_START) 315 #define SMIC_SC_SMM_RD_NEXT (SMIC_STATUS|SMIC_SMM|SMIC_RD_NEXT) 316 #define SMIC_SC_SMM_RD_END (SMIC_STATUS|SMIC_SMM|SMIC_RD_END) 317 318 /* these are the control/status codes we actually use 319 SMIC_CC_SMS_GET_STATUS 0x40 320 SMIC_CC_SMS_WR_START 0x41 321 SMIC_CC_SMS_WR_NEXT 0x42 322 SMIC_CC_SMS_WR_END 0x43 323 SMIC_CC_SMS_RD_START 0x44 324 SMIC_CC_SMS_RD_NEXT 0x45 325 SMIC_CC_SMS_RD_END 0x46 326 327 SMIC_SC_SMS_READY 0xC0 328 SMIC_SC_SMS_WR_START 0xC1 329 SMIC_SC_SMS_WR_NEXT 0xC2 330 SMIC_SC_SMS_WR_END 0xC3 331 SMIC_SC_SMS_RD_START 0xC4 332 SMIC_SC_SMS_RD_NEXT 0xC5 333 SMIC_SC_SMS_RD_END 0xC6 334 */ 335 336 static enum si_sm_result smic_event(struct si_sm_data *smic, long time) 337 { 338 unsigned char status; 339 unsigned char flags; 340 unsigned char data; 341 342 if (smic->state == SMIC_HOSED) { 343 init_smic_data(smic, smic->io); 344 return SI_SM_HOSED; 345 } 346 if (smic->state != SMIC_IDLE) { 347 if (smic_debug & SMIC_DEBUG_STATES) 348 printk(KERN_DEBUG 349 "smic_event - smic->smic_timeout = %ld," 350 " time = %ld\n", 351 smic->smic_timeout, time); 352 /* 353 * FIXME: smic_event is sometimes called with time > 354 * SMIC_RETRY_TIMEOUT 355 */ 356 if (time < SMIC_RETRY_TIMEOUT) { 357 smic->smic_timeout -= time; 358 if (smic->smic_timeout < 0) { 359 start_error_recovery(smic, "smic timed out."); 360 return SI_SM_CALL_WITH_DELAY; 361 } 362 } 363 } 364 flags = read_smic_flags(smic); 365 if (flags & SMIC_FLAG_BSY) 366 return SI_SM_CALL_WITH_DELAY; 367 368 status = read_smic_status(smic); 369 if (smic_debug & SMIC_DEBUG_STATES) 370 printk(KERN_DEBUG 371 "smic_event - state = %d, flags = 0x%02x," 372 " status = 0x%02x\n", 373 smic->state, flags, status); 374 375 switch (smic->state) { 376 case SMIC_IDLE: 377 /* in IDLE we check for available messages */ 378 if (flags & SMIC_SMS_DATA_AVAIL) 379 return SI_SM_ATTN; 380 return SI_SM_IDLE; 381 382 case SMIC_START_OP: 383 /* sanity check whether smic is really idle */ 384 write_smic_control(smic, SMIC_CC_SMS_GET_STATUS); 385 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 386 smic->state = SMIC_OP_OK; 387 break; 388 389 case SMIC_OP_OK: 390 if (status != SMIC_SC_SMS_READY) { 391 /* this should not happen */ 392 start_error_recovery(smic, 393 "state = SMIC_OP_OK," 394 " status != SMIC_SC_SMS_READY"); 395 return SI_SM_CALL_WITH_DELAY; 396 } 397 /* OK so far; smic is idle let us start ... */ 398 write_smic_control(smic, SMIC_CC_SMS_WR_START); 399 write_next_byte(smic); 400 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 401 smic->state = SMIC_WRITE_START; 402 break; 403 404 case SMIC_WRITE_START: 405 if (status != SMIC_SC_SMS_WR_START) { 406 start_error_recovery(smic, 407 "state = SMIC_WRITE_START, " 408 "status != SMIC_SC_SMS_WR_START"); 409 return SI_SM_CALL_WITH_DELAY; 410 } 411 /* 412 * we must not issue WR_(NEXT|END) unless 413 * TX_DATA_READY is set 414 * */ 415 if (flags & SMIC_TX_DATA_READY) { 416 if (smic->write_count == 1) { 417 /* last byte */ 418 write_smic_control(smic, SMIC_CC_SMS_WR_END); 419 smic->state = SMIC_WRITE_END; 420 } else { 421 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT); 422 smic->state = SMIC_WRITE_NEXT; 423 } 424 write_next_byte(smic); 425 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 426 } else 427 return SI_SM_CALL_WITH_DELAY; 428 break; 429 430 case SMIC_WRITE_NEXT: 431 if (status != SMIC_SC_SMS_WR_NEXT) { 432 start_error_recovery(smic, 433 "state = SMIC_WRITE_NEXT, " 434 "status != SMIC_SC_SMS_WR_NEXT"); 435 return SI_SM_CALL_WITH_DELAY; 436 } 437 /* this is the same code as in SMIC_WRITE_START */ 438 if (flags & SMIC_TX_DATA_READY) { 439 if (smic->write_count == 1) { 440 write_smic_control(smic, SMIC_CC_SMS_WR_END); 441 smic->state = SMIC_WRITE_END; 442 } else { 443 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT); 444 smic->state = SMIC_WRITE_NEXT; 445 } 446 write_next_byte(smic); 447 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 448 } else 449 return SI_SM_CALL_WITH_DELAY; 450 break; 451 452 case SMIC_WRITE_END: 453 if (status != SMIC_SC_SMS_WR_END) { 454 start_error_recovery(smic, 455 "state = SMIC_WRITE_END, " 456 "status != SMIC_SC_SMS_WR_END"); 457 return SI_SM_CALL_WITH_DELAY; 458 } 459 /* data register holds an error code */ 460 data = read_smic_data(smic); 461 if (data != 0) { 462 if (smic_debug & SMIC_DEBUG_ENABLE) 463 printk(KERN_DEBUG 464 "SMIC_WRITE_END: data = %02x\n", data); 465 start_error_recovery(smic, 466 "state = SMIC_WRITE_END, " 467 "data != SUCCESS"); 468 return SI_SM_CALL_WITH_DELAY; 469 } else 470 smic->state = SMIC_WRITE2READ; 471 break; 472 473 case SMIC_WRITE2READ: 474 /* 475 * we must wait for RX_DATA_READY to be set before we 476 * can continue 477 */ 478 if (flags & SMIC_RX_DATA_READY) { 479 write_smic_control(smic, SMIC_CC_SMS_RD_START); 480 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 481 smic->state = SMIC_READ_START; 482 } else 483 return SI_SM_CALL_WITH_DELAY; 484 break; 485 486 case SMIC_READ_START: 487 if (status != SMIC_SC_SMS_RD_START) { 488 start_error_recovery(smic, 489 "state = SMIC_READ_START, " 490 "status != SMIC_SC_SMS_RD_START"); 491 return SI_SM_CALL_WITH_DELAY; 492 } 493 if (flags & SMIC_RX_DATA_READY) { 494 read_next_byte(smic); 495 write_smic_control(smic, SMIC_CC_SMS_RD_NEXT); 496 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 497 smic->state = SMIC_READ_NEXT; 498 } else 499 return SI_SM_CALL_WITH_DELAY; 500 break; 501 502 case SMIC_READ_NEXT: 503 switch (status) { 504 /* 505 * smic tells us that this is the last byte to be read 506 * --> clean up 507 */ 508 case SMIC_SC_SMS_RD_END: 509 read_next_byte(smic); 510 write_smic_control(smic, SMIC_CC_SMS_RD_END); 511 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 512 smic->state = SMIC_READ_END; 513 break; 514 case SMIC_SC_SMS_RD_NEXT: 515 if (flags & SMIC_RX_DATA_READY) { 516 read_next_byte(smic); 517 write_smic_control(smic, SMIC_CC_SMS_RD_NEXT); 518 write_smic_flags(smic, flags | SMIC_FLAG_BSY); 519 smic->state = SMIC_READ_NEXT; 520 } else 521 return SI_SM_CALL_WITH_DELAY; 522 break; 523 default: 524 start_error_recovery( 525 smic, 526 "state = SMIC_READ_NEXT, " 527 "status != SMIC_SC_SMS_RD_(NEXT|END)"); 528 return SI_SM_CALL_WITH_DELAY; 529 } 530 break; 531 532 case SMIC_READ_END: 533 if (status != SMIC_SC_SMS_READY) { 534 start_error_recovery(smic, 535 "state = SMIC_READ_END, " 536 "status != SMIC_SC_SMS_READY"); 537 return SI_SM_CALL_WITH_DELAY; 538 } 539 data = read_smic_data(smic); 540 /* data register holds an error code */ 541 if (data != 0) { 542 if (smic_debug & SMIC_DEBUG_ENABLE) 543 printk(KERN_DEBUG 544 "SMIC_READ_END: data = %02x\n", data); 545 start_error_recovery(smic, 546 "state = SMIC_READ_END, " 547 "data != SUCCESS"); 548 return SI_SM_CALL_WITH_DELAY; 549 } else { 550 smic->state = SMIC_IDLE; 551 return SI_SM_TRANSACTION_COMPLETE; 552 } 553 554 case SMIC_HOSED: 555 init_smic_data(smic, smic->io); 556 return SI_SM_HOSED; 557 558 default: 559 if (smic_debug & SMIC_DEBUG_ENABLE) { 560 printk(KERN_DEBUG "smic->state = %d\n", smic->state); 561 start_error_recovery(smic, "state = UNKNOWN"); 562 return SI_SM_CALL_WITH_DELAY; 563 } 564 } 565 smic->smic_timeout = SMIC_RETRY_TIMEOUT; 566 return SI_SM_CALL_WITHOUT_DELAY; 567 } 568 569 static int smic_detect(struct si_sm_data *smic) 570 { 571 /* 572 * It's impossible for the SMIC fnags register to be all 1's, 573 * (assuming a properly functioning, self-initialized BMC) 574 * but that's what you get from reading a bogus address, so we 575 * test that first. 576 */ 577 if (read_smic_flags(smic) == 0xff) 578 return 1; 579 580 return 0; 581 } 582 583 static void smic_cleanup(struct si_sm_data *kcs) 584 { 585 } 586 587 static int smic_size(void) 588 { 589 return sizeof(struct si_sm_data); 590 } 591 592 const struct si_sm_handlers smic_smi_handlers = { 593 .init_data = init_smic_data, 594 .start_transaction = start_smic_transaction, 595 .get_result = smic_get_result, 596 .event = smic_event, 597 .detect = smic_detect, 598 .cleanup = smic_cleanup, 599 .size = smic_size, 600 }; 601