1 /* $NetBSD: viapcib.c,v 1.17 2019/12/22 23:23:30 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@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 1.17 2019/12/22 23:23:30 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 struct i2cbus_attach_args iba; 202 uint8_t b; 203 204 printf("%s: SMBus found at 0x%x (revision 0x%x)\n", 205 device_xname(self), addr, sc->sc_revision); 206 207 /* Disable slave function */ 208 b = viapcib_smbus_read(sc, SMBSLVCNT); 209 viapcib_smbus_write(sc, SMBSLVCNT, b & ~1); 210 211 memset(&iba, 0, sizeof(iba)); 212 iba.iba_tag = &sc->sc_i2c; 213 iic_tag_init(&sc->sc_i2c); 214 iba.iba_tag->ic_cookie = (void *)sc; 215 iba.iba_tag->ic_exec = viapcib_exec; 216 217 config_found_ia(self, "i2cbus", &iba, iicbus_print); 218 } 219 } 220 221 static int 222 viapcib_wait(struct viapcib_softc *sc) 223 { 224 int rv, timeout; 225 uint8_t val = 0; 226 227 timeout = VIAPCIB_SMBUS_TIMEOUT; 228 rv = 0; 229 230 while (timeout--) { 231 val = viapcib_smbus_read(sc, SMBHSTSTS); 232 if (!(val & SMBHSTSTS_BUSY) && (val & SMBHSTSTS_INTR)) 233 break; 234 DELAY(10); 235 } 236 237 if (timeout == 0) 238 rv = EBUSY; 239 240 if ((val & SMBHSTSTS_FAILED) || (val & SMBHSTSTS_COLLISION) || 241 (val & SMBHSTSTS_ERROR)) 242 rv = EIO; 243 244 viapcib_clear(sc); 245 246 return rv; 247 } 248 249 static int 250 viapcib_clear(struct viapcib_softc *sc) 251 { 252 viapcib_smbus_write(sc, SMBHSTSTS, 253 (SMBHSTSTS_FAILED | SMBHSTSTS_COLLISION | SMBHSTSTS_ERROR | 254 SMBHSTSTS_INTR)); 255 DELAY(10); 256 257 return 0; 258 } 259 260 static int 261 viapcib_busy(struct viapcib_softc *sc) 262 { 263 uint8_t val; 264 265 val = viapcib_smbus_read(sc, SMBHSTSTS); 266 267 return (val & SMBHSTSTS_BUSY); 268 } 269 270 static int 271 viapcib_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 272 size_t cmdlen, void *vbuf, size_t buflen, int flags) 273 { 274 struct viapcib_softc *sc; 275 uint8_t cmd; 276 int rv = -1; 277 278 DPRINTF(("viapcib_exec(%p, 0x%x, 0x%x, %p, %d, %p, %d, 0x%x)\n", 279 opaque, op, addr, vcmd, cmdlen, vbuf, buflen, flags)); 280 281 sc = (struct viapcib_softc *)opaque; 282 283 if (op != I2C_OP_READ_WITH_STOP && 284 op != I2C_OP_WRITE_WITH_STOP) 285 return -1; 286 287 if (cmdlen > 0) 288 cmd = *(uint8_t *)(__UNCONST(vcmd)); /* XXX */ 289 290 switch (cmdlen) { 291 case 0: 292 switch (buflen) { 293 case 0: 294 /* SMBus quick read/write */ 295 if (I2C_OP_READ_P(op)) 296 rv = viapcib_smbus_quick_read(sc, addr); 297 else 298 rv = viapcib_smbus_quick_write(sc, addr); 299 300 return rv; 301 case 1: 302 /* SMBus send/receive byte */ 303 if (I2C_OP_READ_P(op)) 304 rv = viapcib_smbus_send_byte(sc, addr, 305 *(uint8_t *)vbuf); 306 else 307 rv = viapcib_smbus_receive_byte(sc, addr, 308 (uint8_t *)vbuf); 309 return rv; 310 default: 311 return -1; 312 } 313 case 1: 314 switch (buflen) { 315 case 0: 316 return -1; 317 case 1: 318 /* SMBus read/write byte */ 319 if (I2C_OP_READ_P(op)) 320 rv = viapcib_smbus_read_byte(sc, addr, 321 cmd, (uint8_t *)vbuf); 322 else 323 rv = viapcib_smbus_write_byte(sc, addr, 324 cmd, *(uint8_t *)vbuf); 325 return rv; 326 case 2: 327 /* SMBus read/write word */ 328 if (I2C_OP_READ_P(op)) 329 rv = viapcib_smbus_read_word(sc, addr, 330 cmd, (uint16_t *)vbuf); 331 else 332 rv = viapcib_smbus_write_word(sc, addr, 333 cmd, *(uint16_t *)vbuf); 334 return rv; 335 default: 336 /* SMBus read/write block */ 337 if (I2C_OP_READ_P(op)) 338 rv = viapcib_smbus_block_read(sc, addr, 339 cmd, buflen, vbuf); 340 else 341 rv = viapcib_smbus_block_write(sc, addr, 342 cmd, buflen, vbuf); 343 return rv; 344 } 345 } 346 347 return -1; /* XXX ??? */ 348 } 349 350 static int 351 viapcib_smbus_quick_write(void *opaque, i2c_addr_t slave) 352 { 353 struct viapcib_softc *sc; 354 355 sc = (struct viapcib_softc *)opaque; 356 357 DPRINTF(("viapcib_smbus_quick_write(%p, 0x%x)\n", opaque, slave)); 358 359 viapcib_clear(sc); 360 if (viapcib_busy(sc)) 361 return EBUSY; 362 363 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 364 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 365 if (viapcib_wait(sc)) 366 return EBUSY; 367 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 368 369 return viapcib_wait(sc); 370 } 371 372 static int 373 viapcib_smbus_quick_read(void *opaque, i2c_addr_t slave) 374 { 375 struct viapcib_softc *sc; 376 377 sc = (struct viapcib_softc *)opaque; 378 379 DPRINTF(("viapcib_smbus_quick_read(%p, 0x%x)\n", opaque, slave)); 380 381 viapcib_clear(sc); 382 if (viapcib_busy(sc)) 383 return EBUSY; 384 385 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 386 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 387 if (viapcib_wait(sc)) 388 return EBUSY; 389 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 390 391 return viapcib_wait(sc); 392 } 393 394 static int 395 viapcib_smbus_send_byte(void *opaque, i2c_addr_t slave, uint8_t byte) 396 { 397 struct viapcib_softc *sc; 398 399 sc = (struct viapcib_softc *)opaque; 400 401 DPRINTF(("viapcib_smbus_send_byte(%p, 0x%x, 0x%x)\n", opaque, 402 slave, byte)); 403 404 viapcib_clear(sc); 405 if (viapcib_busy(sc)) 406 return EBUSY; 407 408 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 409 viapcib_smbus_write(sc, SMBHSTCMD, byte); 410 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 411 if (viapcib_wait(sc)) 412 return EBUSY; 413 viapcib_smbus_write(sc, SMBHSTCNT, 414 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 415 416 return viapcib_wait(sc); 417 } 418 419 static int 420 viapcib_smbus_receive_byte(void *opaque, i2c_addr_t slave, uint8_t *pbyte) 421 { 422 struct viapcib_softc *sc; 423 int rv; 424 425 sc = (struct viapcib_softc *)opaque; 426 427 DPRINTF(("viapcib_smbus_receive_byte(%p, 0x%x, %p)\n", opaque, 428 slave, pbyte)); 429 430 viapcib_clear(sc); 431 if (viapcib_busy(sc)) 432 return EBUSY; 433 434 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 435 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 436 if (viapcib_wait(sc)) 437 return EBUSY; 438 viapcib_smbus_write(sc, SMBHSTCNT, 439 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 440 441 rv = viapcib_wait(sc); 442 if (rv == 0) 443 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 444 445 return rv; 446 } 447 448 static int 449 viapcib_smbus_write_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 450 int8_t byte) 451 { 452 struct viapcib_softc *sc; 453 454 sc = (struct viapcib_softc *)opaque; 455 456 DPRINTF(("viapcib_smbus_write_byte(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 457 slave, cmd, byte)); 458 459 viapcib_clear(sc); 460 if (viapcib_busy(sc)) 461 return EBUSY; 462 463 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 464 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 465 viapcib_smbus_write(sc, SMBHSTDAT0, byte); 466 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 467 if (viapcib_wait(sc)) 468 return EBUSY; 469 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 470 471 return viapcib_wait(sc); 472 } 473 474 static int 475 viapcib_smbus_read_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 476 int8_t *pbyte) 477 { 478 struct viapcib_softc *sc; 479 int rv; 480 481 sc = (struct viapcib_softc *)opaque; 482 483 DPRINTF(("viapcib_smbus_read_byte(%p, 0x%x, 0x%x, %p)\n", opaque, 484 slave, cmd, pbyte)); 485 486 viapcib_clear(sc); 487 if (viapcib_busy(sc)) 488 return EBUSY; 489 490 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 491 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 492 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 493 if (viapcib_wait(sc)) 494 return EBUSY; 495 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 496 rv = viapcib_wait(sc); 497 if (rv == 0) 498 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 499 500 return rv; 501 } 502 503 static int 504 viapcib_smbus_write_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 505 int16_t word) 506 { 507 struct viapcib_softc *sc; 508 509 sc = (struct viapcib_softc *)opaque; 510 511 DPRINTF(("viapcib_smbus_write_word(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 512 slave, cmd, word)); 513 514 viapcib_clear(sc); 515 if (viapcib_busy(sc)) 516 return EBUSY; 517 518 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 519 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 520 viapcib_smbus_write(sc, SMBHSTDAT0, word & 0x00ff); 521 viapcib_smbus_write(sc, SMBHSTDAT1, (word & 0xff00) >> 8); 522 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 523 if (viapcib_wait(sc)) 524 return EBUSY; 525 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 526 527 return viapcib_wait(sc); 528 } 529 530 static int 531 viapcib_smbus_read_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 532 int16_t *pword) 533 { 534 struct viapcib_softc *sc; 535 int rv; 536 int8_t high, low; 537 538 sc = (struct viapcib_softc *)opaque; 539 540 DPRINTF(("viapcib_smbus_read_word(%p, 0x%x, 0x%x, %p)\n", opaque, 541 slave, cmd, pword)); 542 543 viapcib_clear(sc); 544 if (viapcib_busy(sc)) 545 return EBUSY; 546 547 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 548 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 549 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 550 if (viapcib_wait(sc)) 551 return EBUSY; 552 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 553 554 rv = viapcib_wait(sc); 555 if (rv == 0) { 556 low = viapcib_smbus_read(sc, SMBHSTDAT0); 557 high = viapcib_smbus_read(sc, SMBHSTDAT1); 558 *pword = ((high & 0xff) << 8) | (low & 0xff); 559 } 560 561 return rv; 562 } 563 564 static int 565 viapcib_smbus_block_write(void *opaque, i2c_addr_t slave, uint8_t cmd, 566 int cnt, void *data) 567 { 568 struct viapcib_softc *sc; 569 int8_t *buf; 570 int remain, len, i; 571 int rv; 572 573 sc = (struct viapcib_softc *)opaque; 574 buf = (int8_t *)data; 575 rv = 0; 576 577 DPRINTF(("viapcib_smbus_block_write(%p, 0x%x, 0x%x, %d, %p)\n", 578 opaque, slave, cmd, cnt, data)); 579 580 viapcib_clear(sc); 581 if (viapcib_busy(sc)) 582 return EBUSY; 583 584 remain = cnt; 585 while (remain) { 586 len = uimin(remain, SMB_MAXBLOCKSIZE); 587 588 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 589 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 590 viapcib_smbus_write(sc, SMBHSTDAT0, len); 591 i = viapcib_smbus_read(sc, SMBHSTCNT); 592 /* XXX FreeBSD does this, but it looks wrong */ 593 for (i = 0; i < len; i++) { 594 viapcib_smbus_write(sc, SMBBLKDAT, 595 buf[cnt - remain + i]); 596 } 597 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 598 if (viapcib_wait(sc)) 599 return EBUSY; 600 viapcib_smbus_write(sc, SMBHSTCNT, 601 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 602 if (viapcib_wait(sc)) 603 return EBUSY; 604 605 remain -= len; 606 } 607 608 return rv; 609 } 610 611 static int 612 viapcib_smbus_block_read(void *opaque, i2c_addr_t slave, uint8_t cmd, 613 int cnt, void *data) 614 { 615 struct viapcib_softc *sc; 616 int8_t *buf; 617 int remain, len, i; 618 int rv; 619 620 sc = (struct viapcib_softc *)opaque; 621 buf = (int8_t *)data; 622 rv = 0; 623 624 DPRINTF(("viapcib_smbus_block_read(%p, 0x%x, 0x%x, %d, %p)\n", 625 opaque, slave, cmd, cnt, data)); 626 627 viapcib_clear(sc); 628 if (viapcib_busy(sc)) 629 return EBUSY; 630 631 remain = cnt; 632 while (remain) { 633 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 634 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 635 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 636 if (viapcib_wait(sc)) 637 return EBUSY; 638 viapcib_smbus_write(sc, SMBHSTCNT, 639 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 640 if (viapcib_wait(sc)) 641 return EBUSY; 642 643 len = viapcib_smbus_read(sc, SMBHSTDAT0); 644 i = viapcib_smbus_read(sc, SMBHSTCNT); 645 646 len = uimin(len, remain); 647 648 /* FreeBSD does this too... */ 649 for (i = 0; i < len; i++) { 650 buf[cnt - remain + i] = 651 viapcib_smbus_read(sc, SMBBLKDAT); 652 } 653 654 remain -= len; 655 } 656 657 return rv; 658 } 659