1 /* $NetBSD: viapcib.c,v 1.20 2025/09/15 13:23:01 thorpej Exp $ */ 2 /* $FreeBSD: src/sys/pci/viapm.c,v 1.10 2005/05/29 04:42:29 nyan Exp $ */ 3 4 /*- 5 * Copyright (c) 2005, 2006 Jared D. McNeill <jmcneill (at) invisible.ca> 6 * All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions, and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (c) 2001 Alcove - Nicolas Souchu 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 */ 56 57 #include <sys/cdefs.h> 58 __KERNEL_RCSID(0, "$NetBSD: viapcib.c,v 1.20 2025/09/15 13:23:01 thorpej Exp $"); 59 60 #include <sys/types.h> 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/device.h> 64 #include <sys/mutex.h> 65 #include <sys/bus.h> 66 67 #include <dev/pci/pcireg.h> 68 #include <dev/pci/pcivar.h> 69 #include <dev/pci/pcidevs.h> 70 71 #include <dev/i2c/i2cvar.h> 72 73 #include <i386/pci/viapcibreg.h> 74 #include <x86/pci/pcibvar.h> 75 76 /*#define VIAPCIB_DEBUG*/ 77 78 #ifdef VIAPCIB_DEBUG 79 #define DPRINTF(x) printf x 80 #else 81 #define DPRINTF(x) 82 #endif 83 84 struct viapcib_softc { 85 /* we call pcibattach(), which assumes softc starts like this: */ 86 struct pcib_softc sc_pcib; 87 88 bus_space_tag_t sc_iot; 89 bus_space_handle_t sc_ioh; 90 struct i2c_controller sc_i2c; 91 92 int sc_revision; 93 }; 94 95 static int viapcib_match(device_t, cfdata_t, void *); 96 static void viapcib_attach(device_t, device_t, void *); 97 98 static int viapcib_clear(struct viapcib_softc *); 99 static int viapcib_busy(struct viapcib_softc *); 100 101 #define viapcib_smbus_read(sc, o) \ 102 bus_space_read_1((sc)->sc_iot, (sc)->sc_ioh, (o)) 103 #define viapcib_smbus_write(sc, o, v) \ 104 bus_space_write_1((sc)->sc_iot, (sc)->sc_ioh, (o), (v)) 105 106 #define VIAPCIB_SMBUS_TIMEOUT 10000 107 108 static int viapcib_exec(void *, i2c_op_t, i2c_addr_t, const void *, 109 size_t, void *, size_t, int); 110 111 /* SMBus operations */ 112 static int viapcib_smbus_quick_write(void *, i2c_addr_t); 113 static int viapcib_smbus_quick_read(void *, i2c_addr_t); 114 static int viapcib_smbus_send_byte(void *, i2c_addr_t, uint8_t); 115 static int viapcib_smbus_receive_byte(void *, i2c_addr_t, 116 uint8_t *); 117 static int viapcib_smbus_read_byte(void *, i2c_addr_t, uint8_t, 118 int8_t *); 119 static int viapcib_smbus_write_byte(void *, i2c_addr_t, uint8_t, 120 int8_t); 121 static int viapcib_smbus_read_word(void *, i2c_addr_t, uint8_t, 122 int16_t *); 123 static int viapcib_smbus_write_word(void *, i2c_addr_t, uint8_t, 124 int16_t); 125 static int viapcib_smbus_block_write(void *, i2c_addr_t, uint8_t, 126 int, void *); 127 static int viapcib_smbus_block_read(void *, i2c_addr_t, uint8_t, 128 int, void *); 129 /* XXX Should be moved to smbus layer */ 130 #define SMB_MAXBLOCKSIZE 32 131 132 CFATTACH_DECL_NEW(viapcib, sizeof(struct viapcib_softc), 133 viapcib_match, viapcib_attach, NULL, NULL); 134 135 static int 136 viapcib_match(device_t parent, cfdata_t match, void *opaque) 137 { 138 struct pci_attach_args *pa = opaque; 139 140 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_VIATECH) 141 return 0; 142 143 switch (PCI_PRODUCT(pa->pa_id)) { 144 case PCI_PRODUCT_VIATECH_VT8235: 145 case PCI_PRODUCT_VIATECH_VT8237: 146 case PCI_PRODUCT_VIATECH_VT8237A_ISA: 147 return 2; /* match above generic pcib(4) */ 148 } 149 150 return 0; 151 } 152 153 static void 154 viapcib_attach(device_t parent, device_t self, void *opaque) 155 { 156 struct viapcib_softc *sc = device_private(self); 157 struct pci_attach_args *pa = opaque; 158 pcireg_t addr, val; 159 160 /* XXX Only the 8235 is supported for now */ 161 sc->sc_iot = pa->pa_iot; 162 addr = pci_conf_read(pa->pa_pc, pa->pa_tag, SMB_BASE3); 163 addr &= 0xfff0; 164 if (bus_space_map(sc->sc_iot, addr, 8, 0, &sc->sc_ioh)) { 165 printf(": failed to map SMBus I/O space\n"); 166 addr = 0; 167 goto core_pcib; 168 } 169 170 val = pci_conf_read(pa->pa_pc, pa->pa_tag, SMB_HOST_CONFIG); 171 if ((val & 0x10000) == 0) { 172 printf(": SMBus is disabled\n"); 173 addr = 0; 174 /* XXX We can enable the SMBus here by writing 1 to 175 * SMB_HOST_CONFIG, but do we want to? 176 */ 177 goto core_pcib; 178 } 179 180 #ifdef VIAPCIB_DEBUG 181 switch (val & 0x0e) { 182 case 8: 183 printf(": interrupting at irq 9\n"); 184 break; 185 case 0: 186 printf(": interrupting at SMI#\n"); 187 break; 188 default: 189 printf(": interrupt misconfigured\n"); 190 break; 191 } 192 #endif /* !VIAPCIB_DEBUG */ 193 194 val = pci_conf_read(pa->pa_pc, pa->pa_tag, SMB_REVISION); 195 sc->sc_revision = val >> 16; 196 197 core_pcib: 198 pcibattach(parent, self, opaque); 199 200 if (addr != 0) { 201 uint8_t b; 202 203 printf("%s: SMBus found at 0x%x (revision 0x%x)\n", 204 device_xname(self), addr, sc->sc_revision); 205 206 /* Disable slave function */ 207 b = viapcib_smbus_read(sc, SMBSLVCNT); 208 viapcib_smbus_write(sc, SMBSLVCNT, b & ~1); 209 210 iic_tag_init(&sc->sc_i2c); 211 sc->sc_i2c.ic_cookie = (void *)sc; 212 sc->sc_i2c.ic_exec = viapcib_exec; 213 214 iicbus_attach(self, &sc->sc_i2c); 215 } 216 } 217 218 static int 219 viapcib_wait(struct viapcib_softc *sc) 220 { 221 int rv, timeout; 222 uint8_t val = 0; 223 224 timeout = VIAPCIB_SMBUS_TIMEOUT; 225 rv = 0; 226 227 while (timeout--) { 228 val = viapcib_smbus_read(sc, SMBHSTSTS); 229 if (!(val & SMBHSTSTS_BUSY) && (val & SMBHSTSTS_INTR)) 230 break; 231 DELAY(10); 232 } 233 234 if (timeout == 0) 235 rv = EBUSY; 236 237 if ((val & SMBHSTSTS_FAILED) || (val & SMBHSTSTS_COLLISION) || 238 (val & SMBHSTSTS_ERROR)) 239 rv = EIO; 240 241 viapcib_clear(sc); 242 243 return rv; 244 } 245 246 static int 247 viapcib_clear(struct viapcib_softc *sc) 248 { 249 viapcib_smbus_write(sc, SMBHSTSTS, 250 (SMBHSTSTS_FAILED | SMBHSTSTS_COLLISION | SMBHSTSTS_ERROR | 251 SMBHSTSTS_INTR)); 252 DELAY(10); 253 254 return 0; 255 } 256 257 static int 258 viapcib_busy(struct viapcib_softc *sc) 259 { 260 uint8_t val; 261 262 val = viapcib_smbus_read(sc, SMBHSTSTS); 263 264 return (val & SMBHSTSTS_BUSY); 265 } 266 267 static int 268 viapcib_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 269 size_t cmdlen, void *vbuf, size_t buflen, int flags) 270 { 271 struct viapcib_softc *sc; 272 uint8_t cmd; 273 int rv = -1; 274 275 DPRINTF(("viapcib_exec(%p, 0x%x, 0x%x, %p, %d, %p, %d, 0x%x)\n", 276 opaque, op, addr, vcmd, cmdlen, vbuf, buflen, flags)); 277 278 sc = (struct viapcib_softc *)opaque; 279 280 if (op != I2C_OP_READ_WITH_STOP && 281 op != I2C_OP_WRITE_WITH_STOP) 282 return -1; 283 284 if (cmdlen > 0) 285 cmd = *(uint8_t *)(__UNCONST(vcmd)); /* XXX */ 286 287 switch (cmdlen) { 288 case 0: 289 switch (buflen) { 290 case 0: 291 /* SMBus quick read/write */ 292 if (I2C_OP_READ_P(op)) 293 rv = viapcib_smbus_quick_read(sc, addr); 294 else 295 rv = viapcib_smbus_quick_write(sc, addr); 296 297 return rv; 298 case 1: 299 /* SMBus send/receive byte */ 300 if (I2C_OP_READ_P(op)) 301 rv = viapcib_smbus_send_byte(sc, addr, 302 *(uint8_t *)vbuf); 303 else 304 rv = viapcib_smbus_receive_byte(sc, addr, 305 (uint8_t *)vbuf); 306 return rv; 307 default: 308 return -1; 309 } 310 case 1: 311 switch (buflen) { 312 case 0: 313 return -1; 314 case 1: 315 /* SMBus read/write byte */ 316 if (I2C_OP_READ_P(op)) 317 rv = viapcib_smbus_read_byte(sc, addr, 318 cmd, (uint8_t *)vbuf); 319 else 320 rv = viapcib_smbus_write_byte(sc, addr, 321 cmd, *(uint8_t *)vbuf); 322 return rv; 323 case 2: 324 /* SMBus read/write word */ 325 if (I2C_OP_READ_P(op)) 326 rv = viapcib_smbus_read_word(sc, addr, 327 cmd, (uint16_t *)vbuf); 328 else 329 rv = viapcib_smbus_write_word(sc, addr, 330 cmd, *(uint16_t *)vbuf); 331 return rv; 332 default: 333 /* SMBus read/write block */ 334 if (I2C_OP_READ_P(op)) 335 rv = viapcib_smbus_block_read(sc, addr, 336 cmd, buflen, vbuf); 337 else 338 rv = viapcib_smbus_block_write(sc, addr, 339 cmd, buflen, vbuf); 340 return rv; 341 } 342 } 343 344 return -1; /* XXX ??? */ 345 } 346 347 static int 348 viapcib_smbus_quick_write(void *opaque, i2c_addr_t slave) 349 { 350 struct viapcib_softc *sc; 351 352 sc = (struct viapcib_softc *)opaque; 353 354 DPRINTF(("viapcib_smbus_quick_write(%p, 0x%x)\n", opaque, slave)); 355 356 viapcib_clear(sc); 357 if (viapcib_busy(sc)) 358 return EBUSY; 359 360 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 361 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 362 if (viapcib_wait(sc)) 363 return EBUSY; 364 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 365 366 return viapcib_wait(sc); 367 } 368 369 static int 370 viapcib_smbus_quick_read(void *opaque, i2c_addr_t slave) 371 { 372 struct viapcib_softc *sc; 373 374 sc = (struct viapcib_softc *)opaque; 375 376 DPRINTF(("viapcib_smbus_quick_read(%p, 0x%x)\n", opaque, slave)); 377 378 viapcib_clear(sc); 379 if (viapcib_busy(sc)) 380 return EBUSY; 381 382 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 383 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 384 if (viapcib_wait(sc)) 385 return EBUSY; 386 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 387 388 return viapcib_wait(sc); 389 } 390 391 static int 392 viapcib_smbus_send_byte(void *opaque, i2c_addr_t slave, uint8_t byte) 393 { 394 struct viapcib_softc *sc; 395 396 sc = (struct viapcib_softc *)opaque; 397 398 DPRINTF(("viapcib_smbus_send_byte(%p, 0x%x, 0x%x)\n", opaque, 399 slave, byte)); 400 401 viapcib_clear(sc); 402 if (viapcib_busy(sc)) 403 return EBUSY; 404 405 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 406 viapcib_smbus_write(sc, SMBHSTCMD, byte); 407 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 408 if (viapcib_wait(sc)) 409 return EBUSY; 410 viapcib_smbus_write(sc, SMBHSTCNT, 411 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 412 413 return viapcib_wait(sc); 414 } 415 416 static int 417 viapcib_smbus_receive_byte(void *opaque, i2c_addr_t slave, uint8_t *pbyte) 418 { 419 struct viapcib_softc *sc; 420 int rv; 421 422 sc = (struct viapcib_softc *)opaque; 423 424 DPRINTF(("viapcib_smbus_receive_byte(%p, 0x%x, %p)\n", opaque, 425 slave, pbyte)); 426 427 viapcib_clear(sc); 428 if (viapcib_busy(sc)) 429 return EBUSY; 430 431 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 432 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 433 if (viapcib_wait(sc)) 434 return EBUSY; 435 viapcib_smbus_write(sc, SMBHSTCNT, 436 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 437 438 rv = viapcib_wait(sc); 439 if (rv == 0) 440 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 441 442 return rv; 443 } 444 445 static int 446 viapcib_smbus_write_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 447 int8_t byte) 448 { 449 struct viapcib_softc *sc; 450 451 sc = (struct viapcib_softc *)opaque; 452 453 DPRINTF(("viapcib_smbus_write_byte(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 454 slave, cmd, byte)); 455 456 viapcib_clear(sc); 457 if (viapcib_busy(sc)) 458 return EBUSY; 459 460 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 461 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 462 viapcib_smbus_write(sc, SMBHSTDAT0, byte); 463 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 464 if (viapcib_wait(sc)) 465 return EBUSY; 466 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 467 468 return viapcib_wait(sc); 469 } 470 471 static int 472 viapcib_smbus_read_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 473 int8_t *pbyte) 474 { 475 struct viapcib_softc *sc; 476 int rv; 477 478 sc = (struct viapcib_softc *)opaque; 479 480 DPRINTF(("viapcib_smbus_read_byte(%p, 0x%x, 0x%x, %p)\n", opaque, 481 slave, cmd, pbyte)); 482 483 viapcib_clear(sc); 484 if (viapcib_busy(sc)) 485 return EBUSY; 486 487 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 488 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 489 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 490 if (viapcib_wait(sc)) 491 return EBUSY; 492 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 493 rv = viapcib_wait(sc); 494 if (rv == 0) 495 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 496 497 return rv; 498 } 499 500 static int 501 viapcib_smbus_write_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 502 int16_t word) 503 { 504 struct viapcib_softc *sc; 505 506 sc = (struct viapcib_softc *)opaque; 507 508 DPRINTF(("viapcib_smbus_write_word(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 509 slave, cmd, word)); 510 511 viapcib_clear(sc); 512 if (viapcib_busy(sc)) 513 return EBUSY; 514 515 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 516 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 517 viapcib_smbus_write(sc, SMBHSTDAT0, word & 0x00ff); 518 viapcib_smbus_write(sc, SMBHSTDAT1, (word & 0xff00) >> 8); 519 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 520 if (viapcib_wait(sc)) 521 return EBUSY; 522 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 523 524 return viapcib_wait(sc); 525 } 526 527 static int 528 viapcib_smbus_read_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 529 int16_t *pword) 530 { 531 struct viapcib_softc *sc; 532 int rv; 533 int8_t high, low; 534 535 sc = (struct viapcib_softc *)opaque; 536 537 DPRINTF(("viapcib_smbus_read_word(%p, 0x%x, 0x%x, %p)\n", opaque, 538 slave, cmd, pword)); 539 540 viapcib_clear(sc); 541 if (viapcib_busy(sc)) 542 return EBUSY; 543 544 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 545 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 546 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 547 if (viapcib_wait(sc)) 548 return EBUSY; 549 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 550 551 rv = viapcib_wait(sc); 552 if (rv == 0) { 553 low = viapcib_smbus_read(sc, SMBHSTDAT0); 554 high = viapcib_smbus_read(sc, SMBHSTDAT1); 555 *pword = ((high & 0xff) << 8) | (low & 0xff); 556 } 557 558 return rv; 559 } 560 561 static int 562 viapcib_smbus_block_write(void *opaque, i2c_addr_t slave, uint8_t cmd, 563 int cnt, void *data) 564 { 565 struct viapcib_softc *sc; 566 int8_t *buf; 567 int remain, len, i; 568 int rv; 569 570 sc = (struct viapcib_softc *)opaque; 571 buf = (int8_t *)data; 572 rv = 0; 573 574 DPRINTF(("viapcib_smbus_block_write(%p, 0x%x, 0x%x, %d, %p)\n", 575 opaque, slave, cmd, cnt, data)); 576 577 viapcib_clear(sc); 578 if (viapcib_busy(sc)) 579 return EBUSY; 580 581 remain = cnt; 582 while (remain) { 583 len = uimin(remain, SMB_MAXBLOCKSIZE); 584 585 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 586 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 587 viapcib_smbus_write(sc, SMBHSTDAT0, len); 588 i = viapcib_smbus_read(sc, SMBHSTCNT); 589 /* XXX FreeBSD does this, but it looks wrong */ 590 for (i = 0; i < len; i++) { 591 viapcib_smbus_write(sc, SMBBLKDAT, 592 buf[cnt - remain + i]); 593 } 594 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 595 if (viapcib_wait(sc)) 596 return EBUSY; 597 viapcib_smbus_write(sc, SMBHSTCNT, 598 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 599 if (viapcib_wait(sc)) 600 return EBUSY; 601 602 remain -= len; 603 } 604 605 return rv; 606 } 607 608 static int 609 viapcib_smbus_block_read(void *opaque, i2c_addr_t slave, uint8_t cmd, 610 int cnt, void *data) 611 { 612 struct viapcib_softc *sc; 613 int8_t *buf; 614 int remain, len, i; 615 int rv; 616 617 sc = (struct viapcib_softc *)opaque; 618 buf = (int8_t *)data; 619 rv = 0; 620 621 DPRINTF(("viapcib_smbus_block_read(%p, 0x%x, 0x%x, %d, %p)\n", 622 opaque, slave, cmd, cnt, data)); 623 624 viapcib_clear(sc); 625 if (viapcib_busy(sc)) 626 return EBUSY; 627 628 remain = cnt; 629 while (remain) { 630 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 631 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 632 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 633 if (viapcib_wait(sc)) 634 return EBUSY; 635 viapcib_smbus_write(sc, SMBHSTCNT, 636 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 637 if (viapcib_wait(sc)) 638 return EBUSY; 639 640 len = viapcib_smbus_read(sc, SMBHSTDAT0); 641 i = viapcib_smbus_read(sc, SMBHSTCNT); 642 643 len = uimin(len, remain); 644 645 /* FreeBSD does this too... */ 646 for (i = 0; i < len; i++) { 647 buf[cnt - remain + i] = 648 viapcib_smbus_read(sc, SMBBLKDAT); 649 } 650 651 remain -= len; 652 } 653 654 return rv; 655 } 656
Indexes created Thu Oct 02 14:10:14 GMT 2025