1 /* $NetBSD: viapcib.c,v 1.19 2021/08/07 16:18:55 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 1.19 2021/08/07 16:18:55 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(self, &iba, iicbus_print, 218 CFARGS(.iattr = "i2cbus")); 219 } 220 } 221 222 static int 223 viapcib_wait(struct viapcib_softc *sc) 224 { 225 int rv, timeout; 226 uint8_t val = 0; 227 228 timeout = VIAPCIB_SMBUS_TIMEOUT; 229 rv = 0; 230 231 while (timeout--) { 232 val = viapcib_smbus_read(sc, SMBHSTSTS); 233 if (!(val & SMBHSTSTS_BUSY) && (val & SMBHSTSTS_INTR)) 234 break; 235 DELAY(10); 236 } 237 238 if (timeout == 0) 239 rv = EBUSY; 240 241 if ((val & SMBHSTSTS_FAILED) || (val & SMBHSTSTS_COLLISION) || 242 (val & SMBHSTSTS_ERROR)) 243 rv = EIO; 244 245 viapcib_clear(sc); 246 247 return rv; 248 } 249 250 static int 251 viapcib_clear(struct viapcib_softc *sc) 252 { 253 viapcib_smbus_write(sc, SMBHSTSTS, 254 (SMBHSTSTS_FAILED | SMBHSTSTS_COLLISION | SMBHSTSTS_ERROR | 255 SMBHSTSTS_INTR)); 256 DELAY(10); 257 258 return 0; 259 } 260 261 static int 262 viapcib_busy(struct viapcib_softc *sc) 263 { 264 uint8_t val; 265 266 val = viapcib_smbus_read(sc, SMBHSTSTS); 267 268 return (val & SMBHSTSTS_BUSY); 269 } 270 271 static int 272 viapcib_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 273 size_t cmdlen, void *vbuf, size_t buflen, int flags) 274 { 275 struct viapcib_softc *sc; 276 uint8_t cmd; 277 int rv = -1; 278 279 DPRINTF(("viapcib_exec(%p, 0x%x, 0x%x, %p, %d, %p, %d, 0x%x)\n", 280 opaque, op, addr, vcmd, cmdlen, vbuf, buflen, flags)); 281 282 sc = (struct viapcib_softc *)opaque; 283 284 if (op != I2C_OP_READ_WITH_STOP && 285 op != I2C_OP_WRITE_WITH_STOP) 286 return -1; 287 288 if (cmdlen > 0) 289 cmd = *(uint8_t *)(__UNCONST(vcmd)); /* XXX */ 290 291 switch (cmdlen) { 292 case 0: 293 switch (buflen) { 294 case 0: 295 /* SMBus quick read/write */ 296 if (I2C_OP_READ_P(op)) 297 rv = viapcib_smbus_quick_read(sc, addr); 298 else 299 rv = viapcib_smbus_quick_write(sc, addr); 300 301 return rv; 302 case 1: 303 /* SMBus send/receive byte */ 304 if (I2C_OP_READ_P(op)) 305 rv = viapcib_smbus_send_byte(sc, addr, 306 *(uint8_t *)vbuf); 307 else 308 rv = viapcib_smbus_receive_byte(sc, addr, 309 (uint8_t *)vbuf); 310 return rv; 311 default: 312 return -1; 313 } 314 case 1: 315 switch (buflen) { 316 case 0: 317 return -1; 318 case 1: 319 /* SMBus read/write byte */ 320 if (I2C_OP_READ_P(op)) 321 rv = viapcib_smbus_read_byte(sc, addr, 322 cmd, (uint8_t *)vbuf); 323 else 324 rv = viapcib_smbus_write_byte(sc, addr, 325 cmd, *(uint8_t *)vbuf); 326 return rv; 327 case 2: 328 /* SMBus read/write word */ 329 if (I2C_OP_READ_P(op)) 330 rv = viapcib_smbus_read_word(sc, addr, 331 cmd, (uint16_t *)vbuf); 332 else 333 rv = viapcib_smbus_write_word(sc, addr, 334 cmd, *(uint16_t *)vbuf); 335 return rv; 336 default: 337 /* SMBus read/write block */ 338 if (I2C_OP_READ_P(op)) 339 rv = viapcib_smbus_block_read(sc, addr, 340 cmd, buflen, vbuf); 341 else 342 rv = viapcib_smbus_block_write(sc, addr, 343 cmd, buflen, vbuf); 344 return rv; 345 } 346 } 347 348 return -1; /* XXX ??? */ 349 } 350 351 static int 352 viapcib_smbus_quick_write(void *opaque, i2c_addr_t slave) 353 { 354 struct viapcib_softc *sc; 355 356 sc = (struct viapcib_softc *)opaque; 357 358 DPRINTF(("viapcib_smbus_quick_write(%p, 0x%x)\n", opaque, slave)); 359 360 viapcib_clear(sc); 361 if (viapcib_busy(sc)) 362 return EBUSY; 363 364 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 365 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 366 if (viapcib_wait(sc)) 367 return EBUSY; 368 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 369 370 return viapcib_wait(sc); 371 } 372 373 static int 374 viapcib_smbus_quick_read(void *opaque, i2c_addr_t slave) 375 { 376 struct viapcib_softc *sc; 377 378 sc = (struct viapcib_softc *)opaque; 379 380 DPRINTF(("viapcib_smbus_quick_read(%p, 0x%x)\n", opaque, slave)); 381 382 viapcib_clear(sc); 383 if (viapcib_busy(sc)) 384 return EBUSY; 385 386 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 387 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK); 388 if (viapcib_wait(sc)) 389 return EBUSY; 390 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_QUICK | SMBHSTCNT_START); 391 392 return viapcib_wait(sc); 393 } 394 395 static int 396 viapcib_smbus_send_byte(void *opaque, i2c_addr_t slave, uint8_t byte) 397 { 398 struct viapcib_softc *sc; 399 400 sc = (struct viapcib_softc *)opaque; 401 402 DPRINTF(("viapcib_smbus_send_byte(%p, 0x%x, 0x%x)\n", opaque, 403 slave, byte)); 404 405 viapcib_clear(sc); 406 if (viapcib_busy(sc)) 407 return EBUSY; 408 409 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 410 viapcib_smbus_write(sc, SMBHSTCMD, byte); 411 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 412 if (viapcib_wait(sc)) 413 return EBUSY; 414 viapcib_smbus_write(sc, SMBHSTCNT, 415 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 416 417 return viapcib_wait(sc); 418 } 419 420 static int 421 viapcib_smbus_receive_byte(void *opaque, i2c_addr_t slave, uint8_t *pbyte) 422 { 423 struct viapcib_softc *sc; 424 int rv; 425 426 sc = (struct viapcib_softc *)opaque; 427 428 DPRINTF(("viapcib_smbus_receive_byte(%p, 0x%x, %p)\n", opaque, 429 slave, pbyte)); 430 431 viapcib_clear(sc); 432 if (viapcib_busy(sc)) 433 return EBUSY; 434 435 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 436 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV); 437 if (viapcib_wait(sc)) 438 return EBUSY; 439 viapcib_smbus_write(sc, SMBHSTCNT, 440 SMBHSTCNT_START | SMBHSTCNT_SENDRECV); 441 442 rv = viapcib_wait(sc); 443 if (rv == 0) 444 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 445 446 return rv; 447 } 448 449 static int 450 viapcib_smbus_write_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 451 int8_t byte) 452 { 453 struct viapcib_softc *sc; 454 455 sc = (struct viapcib_softc *)opaque; 456 457 DPRINTF(("viapcib_smbus_write_byte(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 458 slave, cmd, byte)); 459 460 viapcib_clear(sc); 461 if (viapcib_busy(sc)) 462 return EBUSY; 463 464 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 465 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 466 viapcib_smbus_write(sc, SMBHSTDAT0, byte); 467 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 468 if (viapcib_wait(sc)) 469 return EBUSY; 470 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 471 472 return viapcib_wait(sc); 473 } 474 475 static int 476 viapcib_smbus_read_byte(void *opaque, i2c_addr_t slave, uint8_t cmd, 477 int8_t *pbyte) 478 { 479 struct viapcib_softc *sc; 480 int rv; 481 482 sc = (struct viapcib_softc *)opaque; 483 484 DPRINTF(("viapcib_smbus_read_byte(%p, 0x%x, 0x%x, %p)\n", opaque, 485 slave, cmd, pbyte)); 486 487 viapcib_clear(sc); 488 if (viapcib_busy(sc)) 489 return EBUSY; 490 491 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 492 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 493 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE); 494 if (viapcib_wait(sc)) 495 return EBUSY; 496 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE); 497 rv = viapcib_wait(sc); 498 if (rv == 0) 499 *pbyte = viapcib_smbus_read(sc, SMBHSTDAT0); 500 501 return rv; 502 } 503 504 static int 505 viapcib_smbus_write_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 506 int16_t word) 507 { 508 struct viapcib_softc *sc; 509 510 sc = (struct viapcib_softc *)opaque; 511 512 DPRINTF(("viapcib_smbus_write_word(%p, 0x%x, 0x%x, 0x%x)\n", opaque, 513 slave, cmd, word)); 514 515 viapcib_clear(sc); 516 if (viapcib_busy(sc)) 517 return EBUSY; 518 519 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 520 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 521 viapcib_smbus_write(sc, SMBHSTDAT0, word & 0x00ff); 522 viapcib_smbus_write(sc, SMBHSTDAT1, (word & 0xff00) >> 8); 523 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 524 if (viapcib_wait(sc)) 525 return EBUSY; 526 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 527 528 return viapcib_wait(sc); 529 } 530 531 static int 532 viapcib_smbus_read_word(void *opaque, i2c_addr_t slave, uint8_t cmd, 533 int16_t *pword) 534 { 535 struct viapcib_softc *sc; 536 int rv; 537 int8_t high, low; 538 539 sc = (struct viapcib_softc *)opaque; 540 541 DPRINTF(("viapcib_smbus_read_word(%p, 0x%x, 0x%x, %p)\n", opaque, 542 slave, cmd, pword)); 543 544 viapcib_clear(sc); 545 if (viapcib_busy(sc)) 546 return EBUSY; 547 548 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 549 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 550 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_WORD); 551 if (viapcib_wait(sc)) 552 return EBUSY; 553 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_WORD); 554 555 rv = viapcib_wait(sc); 556 if (rv == 0) { 557 low = viapcib_smbus_read(sc, SMBHSTDAT0); 558 high = viapcib_smbus_read(sc, SMBHSTDAT1); 559 *pword = ((high & 0xff) << 8) | (low & 0xff); 560 } 561 562 return rv; 563 } 564 565 static int 566 viapcib_smbus_block_write(void *opaque, i2c_addr_t slave, uint8_t cmd, 567 int cnt, void *data) 568 { 569 struct viapcib_softc *sc; 570 int8_t *buf; 571 int remain, len, i; 572 int rv; 573 574 sc = (struct viapcib_softc *)opaque; 575 buf = (int8_t *)data; 576 rv = 0; 577 578 DPRINTF(("viapcib_smbus_block_write(%p, 0x%x, 0x%x, %d, %p)\n", 579 opaque, slave, cmd, cnt, data)); 580 581 viapcib_clear(sc); 582 if (viapcib_busy(sc)) 583 return EBUSY; 584 585 remain = cnt; 586 while (remain) { 587 len = uimin(remain, SMB_MAXBLOCKSIZE); 588 589 viapcib_smbus_write(sc, SMBHSTADD, (slave & 0x7f) << 1); 590 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 591 viapcib_smbus_write(sc, SMBHSTDAT0, len); 592 i = viapcib_smbus_read(sc, SMBHSTCNT); 593 /* XXX FreeBSD does this, but it looks wrong */ 594 for (i = 0; i < len; i++) { 595 viapcib_smbus_write(sc, SMBBLKDAT, 596 buf[cnt - remain + i]); 597 } 598 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 599 if (viapcib_wait(sc)) 600 return EBUSY; 601 viapcib_smbus_write(sc, SMBHSTCNT, 602 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 603 if (viapcib_wait(sc)) 604 return EBUSY; 605 606 remain -= len; 607 } 608 609 return rv; 610 } 611 612 static int 613 viapcib_smbus_block_read(void *opaque, i2c_addr_t slave, uint8_t cmd, 614 int cnt, void *data) 615 { 616 struct viapcib_softc *sc; 617 int8_t *buf; 618 int remain, len, i; 619 int rv; 620 621 sc = (struct viapcib_softc *)opaque; 622 buf = (int8_t *)data; 623 rv = 0; 624 625 DPRINTF(("viapcib_smbus_block_read(%p, 0x%x, 0x%x, %d, %p)\n", 626 opaque, slave, cmd, cnt, data)); 627 628 viapcib_clear(sc); 629 if (viapcib_busy(sc)) 630 return EBUSY; 631 632 remain = cnt; 633 while (remain) { 634 viapcib_smbus_write(sc, SMBHSTADD, ((slave & 0x7f) << 1) | 1); 635 viapcib_smbus_write(sc, SMBHSTCMD, cmd); 636 viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BLOCK); 637 if (viapcib_wait(sc)) 638 return EBUSY; 639 viapcib_smbus_write(sc, SMBHSTCNT, 640 SMBHSTCNT_START | SMBHSTCNT_BLOCK); 641 if (viapcib_wait(sc)) 642 return EBUSY; 643 644 len = viapcib_smbus_read(sc, SMBHSTDAT0); 645 i = viapcib_smbus_read(sc, SMBHSTCNT); 646 647 len = uimin(len, remain); 648 649 /* FreeBSD does this too... */ 650 for (i = 0; i < len; i++) { 651 buf[cnt - remain + i] = 652 viapcib_smbus_read(sc, SMBBLKDAT); 653 } 654 655 remain -= len; 656 } 657 658 return rv; 659 } 660