1 /* 2 * Copyright (c) 2014 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> and was subsequently ported 6 * to FreeBSD by Michael Gmelin <freebsd@grem.de> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 /* 38 * Intel fourth generation mobile cpus integrated I2C device. 39 * 40 * See ig4_reg.h for datasheet reference and notes. 41 * See ig4_var.h for locking semantics. 42 */ 43 44 #include "opt_acpi.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/module.h> 50 #include <sys/errno.h> 51 #include <sys/kdb.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/sx.h> 56 #include <sys/syslog.h> 57 #include <sys/bus.h> 58 #include <sys/sysctl.h> 59 60 #include <machine/bus.h> 61 #include <sys/rman.h> 62 63 #ifdef DEV_ACPI 64 #include <contrib/dev/acpica/include/acpi.h> 65 #include <contrib/dev/acpica/include/accommon.h> 66 #include <dev/acpica/acpivar.h> 67 #endif 68 69 #include <dev/iicbus/iicbus.h> 70 #include <dev/iicbus/iiconf.h> 71 72 #include <dev/ichiic/ig4_reg.h> 73 #include <dev/ichiic/ig4_var.h> 74 75 #define DO_POLL(sc) (cold || kdb_active || SCHEDULER_STOPPED()) 76 77 /* 78 * tLOW, tHIGH periods of the SCL clock and maximal falling time of both 79 * lines are taken from I2C specifications. 80 */ 81 #define IG4_SPEED_STD_THIGH 4000 /* nsec */ 82 #define IG4_SPEED_STD_TLOW 4700 /* nsec */ 83 #define IG4_SPEED_STD_TF_MAX 300 /* nsec */ 84 #define IG4_SPEED_FAST_THIGH 600 /* nsec */ 85 #define IG4_SPEED_FAST_TLOW 1300 /* nsec */ 86 #define IG4_SPEED_FAST_TF_MAX 300 /* nsec */ 87 88 /* 89 * Ig4 hardware parameters except Haswell are taken from intel_lpss driver 90 */ 91 static const struct ig4_hw ig4iic_hw[] = { 92 [IG4_EMAG] = { 93 .ic_clock_rate = 100, /* MHz */ 94 }, 95 [IG4_HASWELL] = { 96 .ic_clock_rate = 100, /* MHz */ 97 .sda_hold_time = 90, /* nsec */ 98 .txfifo_depth = 32, 99 .rxfifo_depth = 32, 100 }, 101 [IG4_ATOM] = { 102 .ic_clock_rate = 100, 103 .sda_fall_time = 280, 104 .scl_fall_time = 240, 105 .sda_hold_time = 60, 106 .txfifo_depth = 32, 107 .rxfifo_depth = 32, 108 }, 109 [IG4_SKYLAKE] = { 110 .ic_clock_rate = 120, 111 .sda_hold_time = 230, 112 }, 113 [IG4_APL] = { 114 .ic_clock_rate = 133, 115 .sda_fall_time = 171, 116 .scl_fall_time = 208, 117 .sda_hold_time = 207, 118 }, 119 [IG4_CANNONLAKE] = { 120 .ic_clock_rate = 216, 121 .sda_hold_time = 230, 122 }, 123 [IG4_TIGERLAKE] = { 124 .ic_clock_rate = 133, 125 .sda_fall_time = 171, 126 .scl_fall_time = 208, 127 .sda_hold_time = 42, 128 }, 129 [IG4_GEMINILAKE] = { 130 .ic_clock_rate = 133, 131 .sda_fall_time = 171, 132 .scl_fall_time = 290, 133 .sda_hold_time = 313, 134 }, 135 }; 136 137 static int ig4iic_set_config(ig4iic_softc_t *sc, bool reset); 138 static driver_filter_t ig4iic_intr; 139 static void ig4iic_dump(ig4iic_softc_t *sc); 140 141 static int ig4_dump; 142 SYSCTL_INT(_debug, OID_AUTO, ig4_dump, CTLFLAG_RW, 143 &ig4_dump, 0, "Dump controller registers"); 144 145 /* 146 * Clock registers initialization control 147 * 0 - Try read clock registers from ACPI and fallback to p.1. 148 * 1 - Calculate values based on controller type (IC clock rate). 149 * 2 - Use values inherited from DragonflyBSD driver (old behavior). 150 * 3 - Keep clock registers intact. 151 */ 152 static int ig4_timings; 153 SYSCTL_INT(_debug, OID_AUTO, ig4_timings, CTLFLAG_RDTUN, &ig4_timings, 0, 154 "Controller timings 0=ACPI, 1=predefined, 2=legacy, 3=do not change"); 155 156 /* 157 * Low-level inline support functions 158 */ 159 static __inline void 160 reg_write(ig4iic_softc_t *sc, uint32_t reg, uint32_t value) 161 { 162 bus_write_4(sc->regs_res, reg, value); 163 bus_barrier(sc->regs_res, reg, 4, BUS_SPACE_BARRIER_WRITE); 164 } 165 166 static __inline uint32_t 167 reg_read(ig4iic_softc_t *sc, uint32_t reg) 168 { 169 uint32_t value; 170 171 bus_barrier(sc->regs_res, reg, 4, BUS_SPACE_BARRIER_READ); 172 value = bus_read_4(sc->regs_res, reg); 173 return (value); 174 } 175 176 static void 177 ig4iic_set_intr_mask(ig4iic_softc_t *sc, uint32_t val) 178 { 179 if (sc->intr_mask != val) { 180 reg_write(sc, IG4_REG_INTR_MASK, val); 181 sc->intr_mask = val; 182 } 183 } 184 185 static int 186 intrstat2iic(ig4iic_softc_t *sc, uint32_t val) 187 { 188 uint32_t src; 189 190 if (val & IG4_INTR_RX_UNDER) 191 reg_read(sc, IG4_REG_CLR_RX_UNDER); 192 if (val & IG4_INTR_RX_OVER) 193 reg_read(sc, IG4_REG_CLR_RX_OVER); 194 if (val & IG4_INTR_TX_OVER) 195 reg_read(sc, IG4_REG_CLR_TX_OVER); 196 197 if (val & IG4_INTR_TX_ABRT) { 198 src = reg_read(sc, IG4_REG_TX_ABRT_SOURCE); 199 reg_read(sc, IG4_REG_CLR_TX_ABORT); 200 /* User-requested abort. Not really a error */ 201 if (src & IG4_ABRTSRC_TRANSFER) 202 return (IIC_ESTATUS); 203 /* Master has lost arbitration */ 204 if (src & IG4_ABRTSRC_ARBLOST) 205 return (IIC_EBUSBSY); 206 /* Did not receive an acknowledge from the remote slave */ 207 if (src & (IG4_ABRTSRC_TXNOACK_ADDR7 | 208 IG4_ABRTSRC_TXNOACK_ADDR10_1 | 209 IG4_ABRTSRC_TXNOACK_ADDR10_2 | 210 IG4_ABRTSRC_TXNOACK_DATA | 211 IG4_ABRTSRC_GENCALL_NOACK)) 212 return (IIC_ENOACK); 213 /* Programming errors */ 214 if (src & (IG4_ABRTSRC_GENCALL_READ | 215 IG4_ABRTSRC_NORESTART_START | 216 IG4_ABRTSRC_NORESTART_10)) 217 return (IIC_ENOTSUPP); 218 /* Other errors */ 219 if (src & IG4_ABRTSRC_ACKED_START) 220 return (IIC_EBUSERR); 221 } 222 /* 223 * TX_OVER, RX_OVER and RX_UNDER are caused by wrong RX/TX FIFO depth 224 * detection or driver's read/write pipelining errors. 225 */ 226 if (val & (IG4_INTR_TX_OVER | IG4_INTR_RX_OVER)) 227 return (IIC_EOVERFLOW); 228 if (val & IG4_INTR_RX_UNDER) 229 return (IIC_EUNDERFLOW); 230 231 return (IIC_NOERR); 232 } 233 234 /* 235 * Enable or disable the controller and wait for the controller to acknowledge 236 * the state change. 237 */ 238 static int 239 set_controller(ig4iic_softc_t *sc, uint32_t ctl) 240 { 241 int retry; 242 int error; 243 uint32_t v; 244 245 /* 246 * When the controller is enabled, interrupt on STOP detect 247 * or receive character ready and clear pending interrupts. 248 */ 249 ig4iic_set_intr_mask(sc, 0); 250 if (ctl & IG4_I2C_ENABLE) 251 reg_read(sc, IG4_REG_CLR_INTR); 252 253 reg_write(sc, IG4_REG_I2C_EN, ctl); 254 error = IIC_ETIMEOUT; 255 256 for (retry = 100; retry > 0; --retry) { 257 v = reg_read(sc, IG4_REG_ENABLE_STATUS); 258 if (((v ^ ctl) & IG4_I2C_ENABLE) == 0) { 259 error = 0; 260 break; 261 } 262 pause("i2cslv", 1); 263 } 264 return (error); 265 } 266 267 /* 268 * Wait up to 25ms for the requested interrupt using a 25uS polling loop. 269 */ 270 static int 271 wait_intr(ig4iic_softc_t *sc, uint32_t intr) 272 { 273 uint32_t v; 274 int error; 275 int txlvl = -1; 276 u_int count_us = 0; 277 u_int limit_us = 1000000; /* 1sec */ 278 279 for (;;) { 280 /* 281 * Check requested status 282 */ 283 v = reg_read(sc, IG4_REG_RAW_INTR_STAT); 284 error = intrstat2iic(sc, v & IG4_INTR_ERR_MASK); 285 if (error || (v & intr)) 286 break; 287 288 /* 289 * When waiting for the transmit FIFO to become empty, 290 * reset the timeout if we see a change in the transmit 291 * FIFO level as progress is being made. 292 */ 293 if (intr & (IG4_INTR_TX_EMPTY | IG4_INTR_STOP_DET)) { 294 v = reg_read(sc, IG4_REG_TXFLR) & IG4_FIFOLVL_MASK; 295 if (txlvl != v) { 296 txlvl = v; 297 count_us = 0; 298 } 299 } 300 301 /* 302 * Stop if we've run out of time. 303 */ 304 if (count_us >= limit_us) { 305 error = IIC_ETIMEOUT; 306 break; 307 } 308 309 /* 310 * When polling is not requested let the interrupt do its work. 311 */ 312 if (!DO_POLL(sc)) { 313 mtx_lock_spin(&sc->io_lock); 314 ig4iic_set_intr_mask(sc, intr | IG4_INTR_ERR_MASK); 315 msleep_spin(sc, &sc->io_lock, "i2cwait", 316 (hz + 99) / 100); /* sleep up to 10ms */ 317 ig4iic_set_intr_mask(sc, 0); 318 mtx_unlock_spin(&sc->io_lock); 319 count_us += 10000; 320 } else { 321 DELAY(25); 322 count_us += 25; 323 } 324 } 325 326 return (error); 327 } 328 329 /* 330 * Set the slave address. The controller must be disabled when 331 * changing the address. 332 * 333 * This operation does not issue anything to the I2C bus but sets 334 * the target address for when the controller later issues a START. 335 */ 336 static void 337 set_slave_addr(ig4iic_softc_t *sc, uint8_t slave) 338 { 339 uint32_t tar; 340 uint32_t ctl; 341 bool use_10bit; 342 343 use_10bit = false; 344 if (sc->slave_valid && sc->last_slave == slave && 345 sc->use_10bit == use_10bit) { 346 return; 347 } 348 sc->use_10bit = use_10bit; 349 350 /* 351 * Wait for TXFIFO to drain before disabling the controller. 352 */ 353 reg_write(sc, IG4_REG_TX_TL, 0); 354 wait_intr(sc, IG4_INTR_TX_EMPTY); 355 356 set_controller(sc, 0); 357 ctl = reg_read(sc, IG4_REG_CTL); 358 ctl &= ~IG4_CTL_10BIT; 359 ctl |= IG4_CTL_RESTARTEN; 360 361 tar = slave; 362 if (sc->use_10bit) { 363 tar |= IG4_TAR_10BIT; 364 ctl |= IG4_CTL_10BIT; 365 } 366 reg_write(sc, IG4_REG_CTL, ctl); 367 reg_write(sc, IG4_REG_TAR_ADD, tar); 368 set_controller(sc, IG4_I2C_ENABLE); 369 sc->slave_valid = true; 370 sc->last_slave = slave; 371 } 372 373 /* 374 * IICBUS API FUNCTIONS 375 */ 376 static int 377 ig4iic_xfer_start(ig4iic_softc_t *sc, uint16_t slave, bool repeated_start) 378 { 379 set_slave_addr(sc, slave >> 1); 380 381 if (!repeated_start) { 382 /* 383 * Clear any previous TX/RX FIFOs overflow/underflow bits 384 * and I2C bus STOP condition. 385 */ 386 reg_read(sc, IG4_REG_CLR_INTR); 387 } 388 389 return (0); 390 } 391 392 static bool 393 ig4iic_xfer_is_started(ig4iic_softc_t *sc) 394 { 395 /* 396 * It requires that no IG4_REG_CLR_INTR or IG4_REG_CLR_START/STOP_DET 397 * register reads is issued after START condition. 398 */ 399 return ((reg_read(sc, IG4_REG_RAW_INTR_STAT) & 400 (IG4_INTR_START_DET | IG4_INTR_STOP_DET)) == IG4_INTR_START_DET); 401 } 402 403 static int 404 ig4iic_xfer_abort(ig4iic_softc_t *sc) 405 { 406 int error; 407 408 /* Request send of STOP condition and flush of TX FIFO */ 409 set_controller(sc, IG4_I2C_ABORT | IG4_I2C_ENABLE); 410 /* 411 * Wait for the TX_ABRT interrupt with ABRTSRC_TRANSFER 412 * bit set in TX_ABRT_SOURCE register. 413 */ 414 error = wait_intr(sc, IG4_INTR_STOP_DET); 415 set_controller(sc, IG4_I2C_ENABLE); 416 417 return (error == IIC_ESTATUS ? 0 : error); 418 } 419 420 /* 421 * Amount of unread data before next burst to get better I2C bus utilization. 422 * 2 bytes is enough in FAST mode. 8 bytes is better in FAST+ and HIGH modes. 423 * Intel-recommended value is 16 for DMA transfers with 64-byte depth FIFOs. 424 */ 425 #define IG4_FIFO_LOWAT 2 426 427 static int 428 ig4iic_read(ig4iic_softc_t *sc, uint8_t *buf, uint16_t len, 429 bool repeated_start, bool stop) 430 { 431 uint32_t cmd; 432 int requested = 0; 433 int received = 0; 434 int burst, target, lowat = 0; 435 int error; 436 437 if (len == 0) 438 return (0); 439 440 while (received < len) { 441 /* Ensure we have some free space in TXFIFO */ 442 burst = sc->cfg.txfifo_depth - 443 (reg_read(sc, IG4_REG_TXFLR) & IG4_FIFOLVL_MASK); 444 if (burst <= 0) { 445 reg_write(sc, IG4_REG_TX_TL, IG4_FIFO_LOWAT); 446 error = wait_intr(sc, IG4_INTR_TX_EMPTY); 447 if (error) 448 break; 449 burst = sc->cfg.txfifo_depth - 450 (reg_read(sc, IG4_REG_TXFLR) & IG4_FIFOLVL_MASK); 451 } 452 /* Ensure we have enough free space in RXFIFO */ 453 burst = MIN(burst, sc->cfg.rxfifo_depth - 454 (requested - received)); 455 target = MIN(requested + burst, (int)len); 456 while (requested < target) { 457 cmd = IG4_DATA_COMMAND_RD; 458 if (repeated_start && requested == 0) 459 cmd |= IG4_DATA_RESTART; 460 if (stop && requested == len - 1) 461 cmd |= IG4_DATA_STOP; 462 reg_write(sc, IG4_REG_DATA_CMD, cmd); 463 requested++; 464 } 465 /* Leave some data queued to maintain the hardware pipeline */ 466 lowat = 0; 467 if (requested != len && requested - received > IG4_FIFO_LOWAT) 468 lowat = IG4_FIFO_LOWAT; 469 /* After TXFLR fills up, clear it by reading available data */ 470 while (received < requested - lowat) { 471 burst = MIN(requested - received, 472 reg_read(sc, IG4_REG_RXFLR) & IG4_FIFOLVL_MASK); 473 if (burst > 0) { 474 while (burst--) 475 buf[received++] = 0xFF & 476 reg_read(sc, IG4_REG_DATA_CMD); 477 } else { 478 reg_write(sc, IG4_REG_RX_TL, 479 requested - received - lowat - 1); 480 error = wait_intr(sc, IG4_INTR_RX_FULL); 481 if (error) 482 goto out; 483 } 484 } 485 } 486 out: 487 return (error); 488 } 489 490 static int 491 ig4iic_write(ig4iic_softc_t *sc, uint8_t *buf, uint16_t len, 492 bool repeated_start, bool stop) 493 { 494 uint32_t cmd; 495 int sent = 0; 496 int burst, target; 497 int error, lowat; 498 499 if (len == 0) 500 return (0); 501 502 while (sent < len) { 503 burst = sc->cfg.txfifo_depth - 504 (reg_read(sc, IG4_REG_TXFLR) & IG4_FIFOLVL_MASK); 505 target = MIN(sent + burst, (int)len); 506 while (sent < target) { 507 cmd = buf[sent]; 508 if (repeated_start && sent == 0) 509 cmd |= IG4_DATA_RESTART; 510 if (stop && sent == len - 1) 511 cmd |= IG4_DATA_STOP; 512 reg_write(sc, IG4_REG_DATA_CMD, cmd); 513 sent++; 514 } 515 if (sent < len) { 516 if (len - sent <= sc->cfg.txfifo_depth) 517 lowat = sc->cfg.txfifo_depth - (len - sent); 518 else 519 lowat = IG4_FIFO_LOWAT; 520 reg_write(sc, IG4_REG_TX_TL, lowat); 521 error = wait_intr(sc, IG4_INTR_TX_EMPTY); 522 if (error) 523 break; 524 } 525 } 526 527 return (error); 528 } 529 530 int 531 ig4iic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) 532 { 533 ig4iic_softc_t *sc = device_get_softc(dev); 534 const char *reason = NULL; 535 uint32_t i; 536 int error; 537 int unit; 538 bool rpstart; 539 bool stop; 540 bool allocated; 541 542 /* 543 * The hardware interface imposes limits on allowed I2C messages. 544 * It is not possible to explicitly send a start or stop. 545 * They are automatically sent (or not sent, depending on the 546 * configuration) when a data byte is transferred. 547 * For this reason it's impossible to send a message with no data 548 * at all (like an SMBus quick message). 549 * The start condition is automatically generated after the stop 550 * condition, so it's impossible to not have a start after a stop. 551 * The repeated start condition is automatically sent if a change 552 * of the transfer direction happens, so it's impossible to have 553 * a change of direction without a (repeated) start. 554 * The repeated start can be forced even without the change of 555 * direction. 556 * Changing the target slave address requires resetting the hardware 557 * state, so it's impossible to do that without the stop followed 558 * by the start. 559 */ 560 for (i = 0; i < nmsgs; i++) { 561 #if 0 562 if (i == 0 && (msgs[i].flags & IIC_M_NOSTART) != 0) { 563 reason = "first message without start"; 564 break; 565 } 566 if (i == nmsgs - 1 && (msgs[i].flags & IIC_M_NOSTOP) != 0) { 567 reason = "last message without stop"; 568 break; 569 } 570 #endif 571 if (msgs[i].len == 0) { 572 reason = "message with no data"; 573 break; 574 } 575 if (i > 0) { 576 if ((msgs[i].flags & IIC_M_NOSTART) != 0 && 577 (msgs[i - 1].flags & IIC_M_NOSTOP) == 0) { 578 reason = "stop not followed by start"; 579 break; 580 } 581 if ((msgs[i - 1].flags & IIC_M_NOSTOP) != 0 && 582 msgs[i].slave != msgs[i - 1].slave) { 583 reason = "change of slave without stop"; 584 break; 585 } 586 if ((msgs[i].flags & IIC_M_NOSTART) != 0 && 587 (msgs[i].flags & IIC_M_RD) != 588 (msgs[i - 1].flags & IIC_M_RD)) { 589 reason = "change of direction without repeated" 590 " start"; 591 break; 592 } 593 } 594 } 595 if (reason != NULL) { 596 if (bootverbose) 597 device_printf(dev, "%s\n", reason); 598 return (IIC_ENOTSUPP); 599 } 600 601 /* Check if device is already allocated with iicbus_request_bus() */ 602 allocated = sx_xlocked(&sc->call_lock) != 0; 603 if (!allocated) 604 sx_xlock(&sc->call_lock); 605 606 /* Debugging - dump registers. */ 607 if (ig4_dump) { 608 unit = device_get_unit(dev); 609 if (ig4_dump & (1 << unit)) { 610 ig4_dump &= ~(1 << unit); 611 ig4iic_dump(sc); 612 } 613 } 614 615 /* 616 * Clear any previous abort condition that may have been holding 617 * the txfifo in reset. 618 */ 619 reg_read(sc, IG4_REG_CLR_TX_ABORT); 620 621 rpstart = false; 622 error = 0; 623 for (i = 0; i < nmsgs; i++) { 624 if ((msgs[i].flags & IIC_M_NOSTART) == 0) { 625 error = ig4iic_xfer_start(sc, msgs[i].slave, rpstart); 626 } else { 627 if (!sc->slave_valid || 628 (msgs[i].slave >> 1) != sc->last_slave) { 629 device_printf(dev, "start condition suppressed" 630 "but slave address is not set up"); 631 error = EINVAL; 632 break; 633 } 634 rpstart = false; 635 } 636 if (error != 0) 637 break; 638 639 stop = (msgs[i].flags & IIC_M_NOSTOP) == 0; 640 if (msgs[i].flags & IIC_M_RD) 641 error = ig4iic_read(sc, msgs[i].buf, msgs[i].len, 642 rpstart, stop); 643 else 644 error = ig4iic_write(sc, msgs[i].buf, msgs[i].len, 645 rpstart, stop); 646 647 /* Wait for error or stop condition occurred on the I2C bus */ 648 if (stop && error == 0) { 649 error = wait_intr(sc, IG4_INTR_STOP_DET); 650 if (error == 0) 651 reg_read(sc, IG4_REG_CLR_INTR); 652 } 653 654 if (error != 0) { 655 /* 656 * Send STOP condition if it's not done yet and flush 657 * both FIFOs. Do a controller soft reset if transfer 658 * abort is failed. 659 */ 660 if (ig4iic_xfer_is_started(sc) && 661 ig4iic_xfer_abort(sc) != 0) { 662 device_printf(sc->dev, "Failed to abort " 663 "transfer. Do the controller reset.\n"); 664 ig4iic_set_config(sc, true); 665 } else { 666 while (reg_read(sc, IG4_REG_I2C_STA) & 667 IG4_STATUS_RX_NOTEMPTY) 668 reg_read(sc, IG4_REG_DATA_CMD); 669 reg_read(sc, IG4_REG_TX_ABRT_SOURCE); 670 reg_read(sc, IG4_REG_CLR_INTR); 671 } 672 break; 673 } 674 675 rpstart = !stop; 676 } 677 678 if (error == IIC_ENOACK && bootverbose) 679 device_printf(dev, "Warning: NACK for slave address 0x%x\n", 680 msgs[i].slave >> 1); 681 682 if (!allocated) 683 sx_unlock(&sc->call_lock); 684 return (error); 685 } 686 687 int 688 ig4iic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) 689 { 690 ig4iic_softc_t *sc = device_get_softc(dev); 691 bool allocated; 692 693 allocated = sx_xlocked(&sc->call_lock) != 0; 694 if (!allocated) 695 sx_xlock(&sc->call_lock); 696 697 /* TODO handle speed configuration? */ 698 if (oldaddr != NULL) 699 *oldaddr = sc->last_slave << 1; 700 set_slave_addr(sc, addr >> 1); 701 if (addr == IIC_UNKNOWN) 702 sc->slave_valid = false; 703 704 if (!allocated) 705 sx_unlock(&sc->call_lock); 706 return (0); 707 } 708 709 int 710 ig4iic_callback(device_t dev, int index, caddr_t data) 711 { 712 ig4iic_softc_t *sc = device_get_softc(dev); 713 int error = 0; 714 int how; 715 716 switch (index) { 717 case IIC_REQUEST_BUS: 718 /* force polling if ig4iic is requested with IIC_DONTWAIT */ 719 how = *(int *)data; 720 if ((how & IIC_WAIT) == 0) { 721 if (sx_try_xlock(&sc->call_lock) == 0) 722 error = IIC_EBUSBSY; 723 } else 724 sx_xlock(&sc->call_lock); 725 break; 726 727 case IIC_RELEASE_BUS: 728 sx_unlock(&sc->call_lock); 729 break; 730 731 default: 732 error = errno2iic(EINVAL); 733 } 734 735 return (error); 736 } 737 738 /* 739 * Clock register values can be calculated with following rough equations: 740 * SCL_HCNT = ceil(IC clock rate * tHIGH) 741 * SCL_LCNT = ceil(IC clock rate * tLOW) 742 * SDA_HOLD = ceil(IC clock rate * SDA hold time) 743 * Precise equations take signal's falling, rising and spike suppression 744 * times in to account. They can be found in Synopsys or Intel documentation. 745 * 746 * Here we snarf formulas and defaults from Linux driver to be able to use 747 * timing values provided by Intel LPSS driver "as is". 748 */ 749 static int 750 ig4iic_clk_params(const struct ig4_hw *hw, int speed, 751 uint16_t *scl_hcnt, uint16_t *scl_lcnt, uint16_t *sda_hold) 752 { 753 uint32_t thigh, tlow, tf_max; /* nsec */ 754 uint32_t sda_fall_time; /* nsec */ 755 uint32_t scl_fall_time; /* nsec */ 756 757 switch (speed) { 758 case IG4_CTL_SPEED_STD: 759 thigh = IG4_SPEED_STD_THIGH; 760 tlow = IG4_SPEED_STD_TLOW; 761 tf_max = IG4_SPEED_STD_TF_MAX; 762 break; 763 764 case IG4_CTL_SPEED_FAST: 765 thigh = IG4_SPEED_FAST_THIGH; 766 tlow = IG4_SPEED_FAST_TLOW; 767 tf_max = IG4_SPEED_FAST_TF_MAX; 768 break; 769 770 default: 771 return (EINVAL); 772 } 773 774 /* Use slowest falling time defaults to be on the safe side */ 775 sda_fall_time = hw->sda_fall_time == 0 ? tf_max : hw->sda_fall_time; 776 *scl_hcnt = (uint16_t) 777 ((hw->ic_clock_rate * (thigh + sda_fall_time) + 500) / 1000 - 3); 778 779 scl_fall_time = hw->scl_fall_time == 0 ? tf_max : hw->scl_fall_time; 780 *scl_lcnt = (uint16_t) 781 ((hw->ic_clock_rate * (tlow + scl_fall_time) + 500) / 1000 - 1); 782 783 /* 784 * There is no "known good" default value for tHD;DAT so keep SDA_HOLD 785 * intact if sda_hold_time value is not provided. 786 */ 787 if (hw->sda_hold_time != 0) 788 *sda_hold = (uint16_t) 789 ((hw->ic_clock_rate * hw->sda_hold_time + 500) / 1000); 790 791 return (0); 792 } 793 794 #ifdef DEV_ACPI 795 static ACPI_STATUS 796 ig4iic_acpi_params(ACPI_HANDLE handle, char *method, 797 uint16_t *scl_hcnt, uint16_t *scl_lcnt, uint16_t *sda_hold) 798 { 799 ACPI_BUFFER buf; 800 ACPI_OBJECT *obj, *elems; 801 ACPI_STATUS status; 802 803 buf.Pointer = NULL; 804 buf.Length = ACPI_ALLOCATE_BUFFER; 805 806 status = AcpiEvaluateObject(handle, method, NULL, &buf); 807 if (ACPI_FAILURE(status)) 808 return (status); 809 810 status = AE_TYPE; 811 obj = (ACPI_OBJECT *)buf.Pointer; 812 if (obj->Type == ACPI_TYPE_PACKAGE && obj->Package.Count == 3) { 813 elems = obj->Package.Elements; 814 *scl_hcnt = elems[0].Integer.Value & IG4_SCL_CLOCK_MASK; 815 *scl_lcnt = elems[1].Integer.Value & IG4_SCL_CLOCK_MASK; 816 *sda_hold = elems[2].Integer.Value & IG4_SDA_TX_HOLD_MASK; 817 status = AE_OK; 818 } 819 820 AcpiOsFree(obj); 821 822 return (status); 823 } 824 #endif /* DEV_ACPI */ 825 826 static void 827 ig4iic_get_config(ig4iic_softc_t *sc) 828 { 829 const struct ig4_hw *hw; 830 uint32_t v; 831 #ifdef DEV_ACPI 832 ACPI_HANDLE handle; 833 #endif 834 /* Fetch default hardware config from controller */ 835 sc->cfg.version = reg_read(sc, IG4_REG_COMP_VER); 836 sc->cfg.bus_speed = reg_read(sc, IG4_REG_CTL) & IG4_CTL_SPEED_MASK; 837 sc->cfg.ss_scl_hcnt = 838 reg_read(sc, IG4_REG_SS_SCL_HCNT) & IG4_SCL_CLOCK_MASK; 839 sc->cfg.ss_scl_lcnt = 840 reg_read(sc, IG4_REG_SS_SCL_LCNT) & IG4_SCL_CLOCK_MASK; 841 sc->cfg.fs_scl_hcnt = 842 reg_read(sc, IG4_REG_FS_SCL_HCNT) & IG4_SCL_CLOCK_MASK; 843 sc->cfg.fs_scl_lcnt = 844 reg_read(sc, IG4_REG_FS_SCL_LCNT) & IG4_SCL_CLOCK_MASK; 845 sc->cfg.ss_sda_hold = sc->cfg.fs_sda_hold = 846 reg_read(sc, IG4_REG_SDA_HOLD) & IG4_SDA_TX_HOLD_MASK; 847 848 if (sc->cfg.bus_speed != IG4_CTL_SPEED_STD) 849 sc->cfg.bus_speed = IG4_CTL_SPEED_FAST; 850 851 /* REG_COMP_PARAM1 is not documented in latest Intel specs */ 852 if (sc->version == IG4_HASWELL || sc->version == IG4_ATOM) { 853 v = reg_read(sc, IG4_REG_COMP_PARAM1); 854 if (IG4_PARAM1_TXFIFO_DEPTH(v) != 0) 855 sc->cfg.txfifo_depth = IG4_PARAM1_TXFIFO_DEPTH(v); 856 if (IG4_PARAM1_RXFIFO_DEPTH(v) != 0) 857 sc->cfg.rxfifo_depth = IG4_PARAM1_RXFIFO_DEPTH(v); 858 } 859 860 /* Override hardware config with IC_clock-based counter values */ 861 if (ig4_timings < 2 && sc->version < nitems(ig4iic_hw)) { 862 hw = &ig4iic_hw[sc->version]; 863 sc->cfg.bus_speed = IG4_CTL_SPEED_FAST; 864 ig4iic_clk_params(hw, IG4_CTL_SPEED_STD, &sc->cfg.ss_scl_hcnt, 865 &sc->cfg.ss_scl_lcnt, &sc->cfg.ss_sda_hold); 866 ig4iic_clk_params(hw, IG4_CTL_SPEED_FAST, &sc->cfg.fs_scl_hcnt, 867 &sc->cfg.fs_scl_lcnt, &sc->cfg.fs_sda_hold); 868 if (hw->txfifo_depth != 0) 869 sc->cfg.txfifo_depth = hw->txfifo_depth; 870 if (hw->rxfifo_depth != 0) 871 sc->cfg.rxfifo_depth = hw->rxfifo_depth; 872 } else if (ig4_timings == 2) { 873 /* 874 * Timings of original ig4 driver: 875 * Program based on a 25000 Hz clock. This is a bit of a 876 * hack (obviously). The defaults are 400 and 470 for standard 877 * and 60 and 130 for fast. The defaults for standard fail 878 * utterly (presumably cause an abort) because the clock time 879 * is ~18.8ms by default. This brings it down to ~4ms. 880 */ 881 sc->cfg.bus_speed = IG4_CTL_SPEED_STD; 882 sc->cfg.ss_scl_hcnt = sc->cfg.fs_scl_hcnt = 100; 883 sc->cfg.ss_scl_lcnt = sc->cfg.fs_scl_lcnt = 125; 884 if (sc->version == IG4_SKYLAKE) 885 sc->cfg.ss_sda_hold = sc->cfg.fs_sda_hold = 28; 886 } 887 888 #ifdef DEV_ACPI 889 /* Evaluate SSCN and FMCN ACPI methods to fetch timings */ 890 if (ig4_timings == 0 && (handle = acpi_get_handle(sc->dev)) != NULL) { 891 ig4iic_acpi_params(handle, "SSCN", &sc->cfg.ss_scl_hcnt, 892 &sc->cfg.ss_scl_lcnt, &sc->cfg.ss_sda_hold); 893 ig4iic_acpi_params(handle, "FMCN", &sc->cfg.fs_scl_hcnt, 894 &sc->cfg.fs_scl_lcnt, &sc->cfg.fs_sda_hold); 895 } 896 #endif 897 898 if (bootverbose) { 899 device_printf(sc->dev, "Controller parameters:\n"); 900 printf(" Speed: %s\n", 901 sc->cfg.bus_speed == IG4_CTL_SPEED_STD ? "Std" : "Fast"); 902 printf(" Regs: HCNT :LCNT :SDAHLD\n"); 903 printf(" Std: 0x%04hx:0x%04hx:0x%04hx\n", 904 sc->cfg.ss_scl_hcnt, sc->cfg.ss_scl_lcnt, 905 sc->cfg.ss_sda_hold); 906 printf(" Fast: 0x%04hx:0x%04hx:0x%04hx\n", 907 sc->cfg.fs_scl_hcnt, sc->cfg.fs_scl_lcnt, 908 sc->cfg.fs_sda_hold); 909 } 910 } 911 912 static int 913 ig4iic_set_config(ig4iic_softc_t *sc, bool reset) 914 { 915 uint32_t v; 916 917 v = reg_read(sc, IG4_REG_DEVIDLE_CTRL); 918 if (IG4_HAS_ADDREGS(sc->version) && (v & IG4_RESTORE_REQUIRED)) { 919 reg_write(sc, IG4_REG_DEVIDLE_CTRL, IG4_DEVICE_IDLE | IG4_RESTORE_REQUIRED); 920 reg_write(sc, IG4_REG_DEVIDLE_CTRL, 0); 921 pause("i2crst", 1); 922 reset = true; 923 } 924 925 if ((sc->version == IG4_HASWELL || sc->version == IG4_ATOM) && reset) { 926 reg_write(sc, IG4_REG_RESETS_HSW, IG4_RESETS_ASSERT_HSW); 927 reg_write(sc, IG4_REG_RESETS_HSW, IG4_RESETS_DEASSERT_HSW); 928 } else if (IG4_HAS_ADDREGS(sc->version) && reset) { 929 reg_write(sc, IG4_REG_RESETS_SKL, IG4_RESETS_ASSERT_SKL); 930 reg_write(sc, IG4_REG_RESETS_SKL, IG4_RESETS_DEASSERT_SKL); 931 } 932 933 if (sc->version == IG4_ATOM) 934 v = reg_read(sc, IG4_REG_COMP_TYPE); 935 936 if (sc->version == IG4_HASWELL || sc->version == IG4_ATOM) { 937 v = reg_read(sc, IG4_REG_COMP_PARAM1); 938 v = reg_read(sc, IG4_REG_GENERAL); 939 /* 940 * The content of IG4_REG_GENERAL is different for each 941 * controller version. 942 */ 943 if (sc->version == IG4_HASWELL && 944 (v & IG4_GENERAL_SWMODE) == 0) { 945 v |= IG4_GENERAL_SWMODE; 946 reg_write(sc, IG4_REG_GENERAL, v); 947 v = reg_read(sc, IG4_REG_GENERAL); 948 } 949 } 950 951 if (sc->version == IG4_HASWELL) { 952 v = reg_read(sc, IG4_REG_SW_LTR_VALUE); 953 v = reg_read(sc, IG4_REG_AUTO_LTR_VALUE); 954 } else if (IG4_HAS_ADDREGS(sc->version)) { 955 v = reg_read(sc, IG4_REG_ACTIVE_LTR_VALUE); 956 v = reg_read(sc, IG4_REG_IDLE_LTR_VALUE); 957 } 958 959 if (sc->version == IG4_HASWELL || sc->version == IG4_ATOM) { 960 v = reg_read(sc, IG4_REG_COMP_VER); 961 if (v < IG4_COMP_MIN_VER) 962 return(ENXIO); 963 } 964 965 if (set_controller(sc, 0)) { 966 device_printf(sc->dev, "controller error during attach-1\n"); 967 return (ENXIO); 968 } 969 970 reg_read(sc, IG4_REG_CLR_INTR); 971 reg_write(sc, IG4_REG_INTR_MASK, 0); 972 sc->intr_mask = 0; 973 974 reg_write(sc, IG4_REG_SS_SCL_HCNT, sc->cfg.ss_scl_hcnt); 975 reg_write(sc, IG4_REG_SS_SCL_LCNT, sc->cfg.ss_scl_lcnt); 976 reg_write(sc, IG4_REG_FS_SCL_HCNT, sc->cfg.fs_scl_hcnt); 977 reg_write(sc, IG4_REG_FS_SCL_LCNT, sc->cfg.fs_scl_lcnt); 978 reg_write(sc, IG4_REG_SDA_HOLD, 979 (sc->cfg.bus_speed & IG4_CTL_SPEED_MASK) == IG4_CTL_SPEED_STD ? 980 sc->cfg.ss_sda_hold : sc->cfg.fs_sda_hold); 981 982 reg_write(sc, IG4_REG_RX_TL, 0); 983 reg_write(sc, IG4_REG_TX_TL, 0); 984 985 reg_write(sc, IG4_REG_CTL, 986 IG4_CTL_MASTER | 987 IG4_CTL_SLAVE_DISABLE | 988 IG4_CTL_RESTARTEN | 989 (sc->cfg.bus_speed & IG4_CTL_SPEED_MASK)); 990 991 /* Force setting of the target address on the next transfer */ 992 sc->slave_valid = false; 993 994 return (0); 995 } 996 997 static void 998 ig4iic_get_fifo(ig4iic_softc_t *sc) 999 { 1000 uint32_t v; 1001 1002 /* 1003 * Hardware does not allow FIFO Threshold Levels value to be set larger 1004 * than the depth of the buffer. If an attempt is made to do that, the 1005 * actual value set will be the maximum depth of the buffer. 1006 */ 1007 if (sc->cfg.txfifo_depth == 0) { 1008 v = reg_read(sc, IG4_REG_TX_TL); 1009 reg_write(sc, IG4_REG_TX_TL, v | IG4_FIFO_MASK); 1010 sc->cfg.txfifo_depth = 1011 (reg_read(sc, IG4_REG_TX_TL) & IG4_FIFO_MASK) + 1; 1012 reg_write(sc, IG4_REG_TX_TL, v); 1013 } 1014 if (sc->cfg.rxfifo_depth == 0) { 1015 v = reg_read(sc, IG4_REG_RX_TL); 1016 reg_write(sc, IG4_REG_RX_TL, v | IG4_FIFO_MASK); 1017 sc->cfg.rxfifo_depth = 1018 (reg_read(sc, IG4_REG_RX_TL) & IG4_FIFO_MASK) + 1; 1019 reg_write(sc, IG4_REG_RX_TL, v); 1020 } 1021 if (bootverbose) { 1022 printf(" FIFO: RX:0x%04x: TX:0x%04x\n", 1023 sc->cfg.rxfifo_depth, sc->cfg.txfifo_depth); 1024 } 1025 } 1026 1027 /* 1028 * Called from ig4iic_pci_attach/detach() 1029 */ 1030 int 1031 ig4iic_attach(ig4iic_softc_t *sc) 1032 { 1033 int error; 1034 1035 mtx_init(&sc->io_lock, "IG4 I/O lock", NULL, MTX_SPIN); 1036 sx_init(&sc->call_lock, "IG4 call lock"); 1037 1038 ig4iic_get_config(sc); 1039 1040 error = ig4iic_set_config(sc, IG4_HAS_ADDREGS(sc->version)); 1041 if (error) 1042 goto done; 1043 ig4iic_get_fifo(sc); 1044 1045 sc->iicbus = device_add_child(sc->dev, "iicbus", DEVICE_UNIT_ANY); 1046 if (sc->iicbus == NULL) { 1047 device_printf(sc->dev, "iicbus driver not found\n"); 1048 error = ENXIO; 1049 goto done; 1050 } 1051 1052 if (set_controller(sc, IG4_I2C_ENABLE)) { 1053 device_printf(sc->dev, "controller error during attach-2\n"); 1054 error = ENXIO; 1055 goto done; 1056 } 1057 if (set_controller(sc, 0)) { 1058 device_printf(sc->dev, "controller error during attach-3\n"); 1059 error = ENXIO; 1060 goto done; 1061 } 1062 error = bus_setup_intr(sc->dev, sc->intr_res, INTR_TYPE_MISC | INTR_MPSAFE, 1063 ig4iic_intr, NULL, sc, &sc->intr_handle); 1064 if (error) { 1065 device_printf(sc->dev, 1066 "Unable to setup irq: error %d\n", error); 1067 } 1068 1069 bus_attach_children(sc->dev); 1070 1071 done: 1072 return (error); 1073 } 1074 1075 int 1076 ig4iic_detach(ig4iic_softc_t *sc) 1077 { 1078 int error; 1079 1080 error = bus_generic_detach(sc->dev); 1081 if (error) 1082 return (error); 1083 if (sc->intr_handle) 1084 bus_teardown_intr(sc->dev, sc->intr_res, sc->intr_handle); 1085 1086 sx_xlock(&sc->call_lock); 1087 1088 sc->iicbus = NULL; 1089 sc->intr_handle = NULL; 1090 reg_write(sc, IG4_REG_INTR_MASK, 0); 1091 set_controller(sc, 0); 1092 1093 sx_xunlock(&sc->call_lock); 1094 1095 mtx_destroy(&sc->io_lock); 1096 sx_destroy(&sc->call_lock); 1097 1098 return (0); 1099 } 1100 1101 int 1102 ig4iic_suspend(ig4iic_softc_t *sc) 1103 { 1104 int error; 1105 1106 /* suspend all children */ 1107 error = bus_generic_suspend(sc->dev); 1108 1109 sx_xlock(&sc->call_lock); 1110 set_controller(sc, 0); 1111 if (IG4_HAS_ADDREGS(sc->version)) { 1112 /* 1113 * Place the device in the idle state, just to be safe 1114 */ 1115 reg_write(sc, IG4_REG_DEVIDLE_CTRL, IG4_DEVICE_IDLE); 1116 /* 1117 * Controller can become dysfunctional if I2C lines are pulled 1118 * down when suspend procedure turns off power to I2C device. 1119 * Place device in the reset state to avoid this. 1120 */ 1121 reg_write(sc, IG4_REG_RESETS_SKL, IG4_RESETS_ASSERT_SKL); 1122 } 1123 sx_xunlock(&sc->call_lock); 1124 1125 return (error); 1126 } 1127 1128 int ig4iic_resume(ig4iic_softc_t *sc) 1129 { 1130 int error; 1131 1132 sx_xlock(&sc->call_lock); 1133 if (ig4iic_set_config(sc, IG4_HAS_ADDREGS(sc->version))) 1134 device_printf(sc->dev, "controller error during resume\n"); 1135 sx_xunlock(&sc->call_lock); 1136 1137 error = bus_generic_resume(sc->dev); 1138 1139 return (error); 1140 } 1141 1142 /* 1143 * Interrupt Operation, see ig4_var.h for locking semantics. 1144 */ 1145 static int 1146 ig4iic_intr(void *cookie) 1147 { 1148 ig4iic_softc_t *sc = cookie; 1149 int retval = FILTER_STRAY; 1150 1151 mtx_lock_spin(&sc->io_lock); 1152 /* Ignore stray interrupts */ 1153 if (sc->intr_mask != 0 && reg_read(sc, IG4_REG_INTR_STAT) != 0) { 1154 /* Interrupt bits are cleared in wait_intr() loop */ 1155 ig4iic_set_intr_mask(sc, 0); 1156 wakeup(sc); 1157 retval = FILTER_HANDLED; 1158 } 1159 mtx_unlock_spin(&sc->io_lock); 1160 1161 return (retval); 1162 } 1163 1164 #define REGDUMP(sc, reg) \ 1165 device_printf(sc->dev, " %-23s %08x\n", #reg, reg_read(sc, reg)) 1166 1167 static void 1168 ig4iic_dump(ig4iic_softc_t *sc) 1169 { 1170 device_printf(sc->dev, "ig4iic register dump:\n"); 1171 REGDUMP(sc, IG4_REG_CTL); 1172 REGDUMP(sc, IG4_REG_TAR_ADD); 1173 REGDUMP(sc, IG4_REG_SS_SCL_HCNT); 1174 REGDUMP(sc, IG4_REG_SS_SCL_LCNT); 1175 REGDUMP(sc, IG4_REG_FS_SCL_HCNT); 1176 REGDUMP(sc, IG4_REG_FS_SCL_LCNT); 1177 REGDUMP(sc, IG4_REG_INTR_STAT); 1178 REGDUMP(sc, IG4_REG_INTR_MASK); 1179 REGDUMP(sc, IG4_REG_RAW_INTR_STAT); 1180 REGDUMP(sc, IG4_REG_RX_TL); 1181 REGDUMP(sc, IG4_REG_TX_TL); 1182 REGDUMP(sc, IG4_REG_I2C_EN); 1183 REGDUMP(sc, IG4_REG_I2C_STA); 1184 REGDUMP(sc, IG4_REG_TXFLR); 1185 REGDUMP(sc, IG4_REG_RXFLR); 1186 REGDUMP(sc, IG4_REG_SDA_HOLD); 1187 REGDUMP(sc, IG4_REG_TX_ABRT_SOURCE); 1188 REGDUMP(sc, IG4_REG_SLV_DATA_NACK); 1189 REGDUMP(sc, IG4_REG_DMA_CTRL); 1190 REGDUMP(sc, IG4_REG_DMA_TDLR); 1191 REGDUMP(sc, IG4_REG_DMA_RDLR); 1192 REGDUMP(sc, IG4_REG_SDA_SETUP); 1193 REGDUMP(sc, IG4_REG_ENABLE_STATUS); 1194 REGDUMP(sc, IG4_REG_COMP_PARAM1); 1195 REGDUMP(sc, IG4_REG_COMP_VER); 1196 if (sc->version == IG4_ATOM) { 1197 REGDUMP(sc, IG4_REG_COMP_TYPE); 1198 REGDUMP(sc, IG4_REG_CLK_PARMS); 1199 } 1200 if (sc->version == IG4_HASWELL || sc->version == IG4_ATOM) { 1201 REGDUMP(sc, IG4_REG_RESETS_HSW); 1202 REGDUMP(sc, IG4_REG_GENERAL); 1203 } else if (sc->version == IG4_SKYLAKE) { 1204 REGDUMP(sc, IG4_REG_RESETS_SKL); 1205 } 1206 if (sc->version == IG4_HASWELL) { 1207 REGDUMP(sc, IG4_REG_SW_LTR_VALUE); 1208 REGDUMP(sc, IG4_REG_AUTO_LTR_VALUE); 1209 } else if (IG4_HAS_ADDREGS(sc->version)) { 1210 REGDUMP(sc, IG4_REG_ACTIVE_LTR_VALUE); 1211 REGDUMP(sc, IG4_REG_IDLE_LTR_VALUE); 1212 } 1213 } 1214 #undef REGDUMP 1215 1216 DRIVER_MODULE(iicbus, ig4iic, iicbus_driver, NULL, NULL); 1217 #ifdef DEV_ACPI 1218 DRIVER_MODULE(acpi_iicbus, ig4iic, acpi_iicbus_driver, NULL, NULL); 1219 #endif 1220 MODULE_DEPEND(ig4iic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 1221 MODULE_VERSION(ig4iic, 1); 1222