cuda.c revision 1.34
1 /* $NetBSD: cuda.c,v 1.34 2025/09/23 13:57:31 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Michael Lorenz 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: cuda.c,v 1.34 2025/09/23 13:57:31 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/device.h> 36 #include <sys/proc.h> 37 #include <sys/mutex.h> 38 39 #include <sys/bus.h> 40 #include <machine/autoconf.h> 41 #include <machine/pio.h> 42 #include <dev/clock_subr.h> 43 44 #include <dev/i2c/i2cvar.h> 45 #include <dev/i2c/i2c_calls.h> 46 #include <dev/i2c/i2c_enum.h> 47 48 #include <macppc/dev/viareg.h> 49 #include <macppc/dev/cudavar.h> 50 51 #include <dev/ofw/openfirm.h> 52 #include <dev/adb/adbvar.h> 53 #include "opt_cuda.h" 54 55 #ifdef CUDA_DEBUG 56 #define DPRINTF printf 57 #else 58 #define DPRINTF while (0) printf 59 #endif 60 61 #define CUDA_NOTREADY 0x1 /* has not been initialized yet */ 62 #define CUDA_IDLE 0x2 /* the bus is currently idle */ 63 #define CUDA_OUT 0x3 /* sending out a command */ 64 #define CUDA_IN 0x4 /* receiving data */ 65 #define CUDA_POLLING 0x5 /* polling - II only */ 66 67 static void cuda_attach(device_t, device_t, void *); 68 static int cuda_match(device_t, struct cfdata *, void *); 69 static void cuda_autopoll(void *, int); 70 71 static int cuda_intr(void *); 72 73 typedef struct _cuda_handler { 74 int (*handler)(void *, int, uint8_t *); 75 void *cookie; 76 } CudaHandler; 77 78 struct cuda_softc { 79 device_t sc_dev; 80 void *sc_ih; 81 CudaHandler sc_handlers[16]; 82 struct todr_chip_handle sc_todr; 83 struct adb_bus_accessops sc_adbops; 84 struct i2c_controller sc_i2c; 85 bus_space_tag_t sc_memt; 86 bus_space_handle_t sc_memh; 87 88 /* 89 * We provide our own i2c device enumeration method, so we 90 * need to subclass our device handle. 91 */ 92 struct devhandle_impl sc_devhandle_impl; 93 94 int sc_node; 95 int sc_state; 96 int sc_waiting; 97 int sc_polling; 98 int sc_sent; 99 int sc_out_length; 100 int sc_received; 101 int sc_iic_done; 102 int sc_error; 103 /* time */ 104 uint32_t sc_tod; 105 uint32_t sc_autopoll; 106 kcondvar_t sc_todev; 107 kmutex_t sc_todevmtx; 108 /* ADB */ 109 void (*sc_adb_handler)(void *, int, uint8_t *); 110 void *sc_adb_cookie; 111 uint32_t sc_i2c_read_len; 112 /* internal buffers */ 113 uint8_t sc_in[256]; 114 uint8_t sc_out[256]; 115 }; 116 117 CFATTACH_DECL_NEW(cuda, sizeof(struct cuda_softc), 118 cuda_match, cuda_attach, NULL, NULL); 119 120 static inline void cuda_write_reg(struct cuda_softc *, int, uint8_t); 121 static inline uint8_t cuda_read_reg(struct cuda_softc *, int); 122 static void cuda_idle(struct cuda_softc *); 123 static void cuda_tip(struct cuda_softc *); 124 static void cuda_clear_tip(struct cuda_softc *); 125 static void cuda_in(struct cuda_softc *); 126 static void cuda_out(struct cuda_softc *); 127 static void cuda_toggle_ack(struct cuda_softc *); 128 static void cuda_ack_off(struct cuda_softc *); 129 static int cuda_intr_state(struct cuda_softc *); 130 131 static void cuda_init(struct cuda_softc *); 132 133 /* 134 * send a message to Cuda. 135 */ 136 /* cookie, flags, length, data */ 137 static int cuda_send(void *, int, int, uint8_t *); 138 static void cuda_poll(void *); 139 static void cuda_adb_poll(void *); 140 static int cuda_set_handler(void *, int, int (*)(void *, int, uint8_t *), void *); 141 142 static int cuda_error_handler(void *, int, uint8_t *); 143 144 static int cuda_todr_handler(void *, int, uint8_t *); 145 static int cuda_todr_set(todr_chip_handle_t, struct timeval *); 146 static int cuda_todr_get(todr_chip_handle_t, struct timeval *); 147 148 static int cuda_adb_handler(void *, int, uint8_t *); 149 static void cuda_final(device_t); 150 151 static struct cuda_attach_args *cuda0 = NULL; 152 153 /* ADB bus attachment stuff */ 154 static int cuda_adb_send(void *, int, int, int, uint8_t *); 155 static int cuda_adb_set_handler(void *, void (*)(void *, int, uint8_t *), void *); 156 157 /* i2c stuff */ 158 static int cuda_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 159 void *, size_t, int); 160 161 static const struct i2c_deventry cuda_i2c_devices[] = { 162 { .name = "videopll", 163 .compat = "aapl,valkyrie-videopll", 164 .addr = 0x50, 165 .data = "/valkyrie" }, 166 167 { .name = "sgsmix", 168 .compat = "st,tda7433", 169 .addr = 0x8a, 170 .data = "/perch" }, 171 172 I2C_DEVENTRY_EOL 173 }; 174 175 static bool 176 cuda_i2cdev_callback(device_t dev, devhandle_t call_handle, 177 const struct i2c_deventry *entry, devhandle_t *child_devhandlep) 178 { 179 return (OF_finddevice((const char *)entry->data) != -1); 180 } 181 182 static int 183 cuda_i2c_enumerate_devices(device_t dev, devhandle_t call_handle, void *v) 184 { 185 struct i2c_enumerate_devices_args *args = v; 186 187 i2c_enumerate_deventries(dev, call_handle, args, 188 cuda_i2c_devices, cuda_i2cdev_callback); 189 190 return 0; 191 } 192 193 static device_call_t 194 cuda_devhandle_lookup_device_call(devhandle_t handle, const char *name, 195 devhandle_t *call_handlep) 196 { 197 if (strcmp(name, I2C_ENUMERATE_DEVICES_STR) == 0) { 198 return cuda_i2c_enumerate_devices; 199 } 200 201 /* Defer everything else to the "super". */ 202 return NULL; 203 } 204 205 static int 206 cuda_match(device_t parent, struct cfdata *cf, void *aux) 207 { 208 struct confargs *ca = aux; 209 210 if (ca->ca_nreg < 8) 211 return 0; 212 213 if (ca->ca_nintr < 4) 214 return 0; 215 216 if (strcmp(ca->ca_name, "via-cuda") == 0) { 217 return 10; /* beat adb* at obio? */ 218 } 219 220 return 0; 221 } 222 223 static void 224 cuda_attach(device_t parent, device_t self, void *aux) 225 { 226 struct confargs *ca = aux; 227 struct cuda_softc *sc = device_private(self); 228 static struct cuda_attach_args caa; 229 int irq = ca->ca_intr[0]; 230 int node, i, child; 231 char name[32]; 232 233 sc->sc_dev = self; 234 node = of_getnode_byname(OF_parent(ca->ca_node), "extint-gpio1"); 235 if (node) 236 OF_getprop(node, "interrupts", &irq, 4); 237 238 aprint_normal(" irq %d", irq); 239 240 sc->sc_node = ca->ca_node; 241 sc->sc_memt = ca->ca_tag; 242 243 sc->sc_sent = 0; 244 sc->sc_received = 0; 245 sc->sc_waiting = 0; 246 sc->sc_polling = 0; 247 sc->sc_state = CUDA_NOTREADY; 248 sc->sc_error = 0; 249 sc->sc_i2c_read_len = 0; 250 251 cv_init(&sc->sc_todev, "cuda_event"); 252 mutex_init(&sc->sc_todevmtx, MUTEX_DEFAULT, IPL_NONE); 253 254 if (bus_space_map(sc->sc_memt, ca->ca_reg[0] + ca->ca_baseaddr, 255 ca->ca_reg[1], 0, &sc->sc_memh) != 0) { 256 257 aprint_normal(": unable to map registers\n"); 258 return; 259 } 260 sc->sc_ih = intr_establish_xname(irq, IST_EDGE, IPL_TTY, cuda_intr, sc, 261 device_xname(self)); 262 printf("\n"); 263 264 for (i = 0; i < 16; i++) { 265 sc->sc_handlers[i].handler = NULL; 266 sc->sc_handlers[i].cookie = NULL; 267 } 268 269 cuda_init(sc); 270 271 /* now attach children */ 272 config_interrupts(self, cuda_final); 273 cuda_set_handler(sc, CUDA_ERROR, cuda_error_handler, sc); 274 cuda_set_handler(sc, CUDA_PSEUDO, cuda_todr_handler, sc); 275 276 child = OF_child(ca->ca_node); 277 while (child != 0) { 278 279 if (OF_getprop(child, "name", name, 32) == 0) 280 continue; 281 if (strncmp(name, "adb", 4) == 0) { 282 283 cuda_set_handler(sc, CUDA_ADB, cuda_adb_handler, sc); 284 sc->sc_adbops.cookie = sc; 285 sc->sc_adbops.send = cuda_adb_send; 286 sc->sc_adbops.poll = cuda_adb_poll; 287 sc->sc_adbops.autopoll = cuda_autopoll; 288 sc->sc_adbops.set_handler = cuda_adb_set_handler; 289 config_found(self, &sc->sc_adbops, nadb_print, 290 CFARGS(.iattr = "adb_bus")); 291 } else if (strncmp(name, "rtc", 4) == 0) { 292 293 sc->sc_todr.todr_gettime = cuda_todr_get; 294 sc->sc_todr.todr_settime = cuda_todr_set; 295 sc->sc_todr.todr_dev = self; 296 todr_attach(&sc->sc_todr); 297 } 298 child = OF_peer(child); 299 } 300 301 caa.cookie = sc; 302 caa.set_handler = cuda_set_handler; 303 caa.send = cuda_send; 304 caa.poll = cuda_poll; 305 #if notyet 306 config_found(self, &caa, cuda_print, CFARGS_NONE); 307 #endif 308 309 /* 310 * There are no OF nodes for our I2C devices, so we provide 311 * our own enumeration method. 312 */ 313 iic_tag_init(&sc->sc_i2c); 314 sc->sc_i2c.ic_cookie = sc; 315 sc->sc_i2c.ic_exec = cuda_i2c_exec; 316 317 iicbus_attach_with_devhandle(self, &sc->sc_i2c, 318 devhandle_subclass(device_handle(self), 319 &sc->sc_devhandle_impl, 320 cuda_devhandle_lookup_device_call)); 321 322 if (cuda0 == NULL) 323 cuda0 = &caa; 324 } 325 326 static void 327 cuda_init(struct cuda_softc *sc) 328 { 329 uint8_t reg; 330 331 reg = cuda_read_reg(sc, vDirB); 332 reg |= 0x30; /* register B bits 4 and 5: outputs */ 333 cuda_write_reg(sc, vDirB, reg); 334 335 reg = cuda_read_reg(sc, vDirB); 336 reg &= 0xf7; /* register B bit 3: input */ 337 cuda_write_reg(sc, vDirB, reg); 338 339 reg = cuda_read_reg(sc, vACR); 340 reg &= ~vSR_OUT; /* make sure SR is set to IN */ 341 cuda_write_reg(sc, vACR, reg); 342 343 cuda_write_reg(sc, vACR, (cuda_read_reg(sc, vACR) | 0x0c) & ~0x10); 344 345 sc->sc_state = CUDA_IDLE; /* used by all types of hardware */ 346 347 cuda_write_reg(sc, vIER, 0x84); /* make sure VIA interrupts are on */ 348 cuda_idle(sc); /* set ADB bus state to idle */ 349 350 /* sort of a device reset */ 351 (void)cuda_read_reg(sc, vSR); /* clear interrupt */ 352 cuda_write_reg(sc, vIER, 0x04); /* no interrupts while clearing */ 353 cuda_idle(sc); /* reset state to idle */ 354 delay(150); 355 cuda_tip(sc); /* signal start of frame */ 356 delay(150); 357 cuda_toggle_ack(sc); 358 delay(150); 359 cuda_clear_tip(sc); 360 delay(150); 361 cuda_idle(sc); /* back to idle state */ 362 (void)cuda_read_reg(sc, vSR); /* clear interrupt */ 363 cuda_write_reg(sc, vIER, 0x84); /* ints ok now */ 364 } 365 366 static void 367 cuda_final(device_t dev) 368 { 369 struct cuda_softc *sc = device_private(dev); 370 371 sc->sc_polling = 0; 372 } 373 374 static inline void 375 cuda_write_reg(struct cuda_softc *sc, int offset, uint8_t value) 376 { 377 378 bus_space_write_1(sc->sc_memt, sc->sc_memh, offset, value); 379 } 380 381 static inline uint8_t 382 cuda_read_reg(struct cuda_softc *sc, int offset) 383 { 384 385 return bus_space_read_1(sc->sc_memt, sc->sc_memh, offset); 386 } 387 388 static int 389 cuda_set_handler(void *cookie, int type, 390 int (*handler)(void *, int, uint8_t *), void *hcookie) 391 { 392 struct cuda_softc *sc = cookie; 393 CudaHandler *me; 394 395 if ((type >= 0) && (type < 16)) { 396 me = &sc->sc_handlers[type]; 397 me->handler = handler; 398 me->cookie = hcookie; 399 return 0; 400 } 401 return -1; 402 } 403 404 static int 405 cuda_send(void *cookie, int poll, int length, uint8_t *msg) 406 { 407 struct cuda_softc *sc = cookie; 408 int s; 409 410 DPRINTF("cuda_send %08x\n", (uint32_t)cookie); 411 if (sc->sc_state == CUDA_NOTREADY) 412 return -1; 413 414 s = splhigh(); 415 416 if (sc->sc_state == CUDA_IDLE /*&& 417 (cuda_read_reg(sc, vBufB) & vPB3) == vPB3*/) { 418 /* fine */ 419 DPRINTF("chip is idle\n"); 420 } else { 421 DPRINTF("cuda state is %d\n", sc->sc_state); 422 if (sc->sc_waiting == 0) { 423 sc->sc_waiting = 1; 424 } else { 425 splx(s); 426 return -1; 427 } 428 } 429 430 sc->sc_error = 0; 431 memcpy(sc->sc_out, msg, length); 432 sc->sc_out_length = length; 433 sc->sc_sent = 0; 434 435 if (sc->sc_waiting != 1) { 436 437 delay(150); 438 sc->sc_state = CUDA_OUT; 439 cuda_out(sc); 440 cuda_write_reg(sc, vSR, sc->sc_out[0]); 441 cuda_ack_off(sc); 442 cuda_tip(sc); 443 } 444 sc->sc_waiting = 1; 445 446 if (sc->sc_polling || poll || cold) { 447 cuda_poll(sc); 448 } 449 450 splx(s); 451 452 return 0; 453 } 454 455 static void 456 cuda_poll(void *cookie) 457 { 458 struct cuda_softc *sc = cookie; 459 int s; 460 461 DPRINTF("polling\n"); 462 while ((sc->sc_state != CUDA_IDLE) || 463 (cuda_intr_state(sc)) || 464 (sc->sc_waiting == 1)) { 465 if ((cuda_read_reg(sc, vIFR) & vSR_INT) == vSR_INT) { 466 s = splhigh(); 467 cuda_intr(sc); 468 splx(s); 469 } 470 } 471 } 472 473 static void 474 cuda_adb_poll(void *cookie) 475 { 476 struct cuda_softc *sc = cookie; 477 int s; 478 479 s = splhigh(); 480 cuda_intr(sc); 481 splx(s); 482 } 483 484 static void 485 cuda_idle(struct cuda_softc *sc) 486 { 487 uint8_t reg; 488 489 reg = cuda_read_reg(sc, vBufB); 490 reg |= (vPB4 | vPB5); 491 cuda_write_reg(sc, vBufB, reg); 492 } 493 494 static void 495 cuda_tip(struct cuda_softc *sc) 496 { 497 uint8_t reg; 498 499 reg = cuda_read_reg(sc, vBufB); 500 reg &= ~vPB5; 501 cuda_write_reg(sc, vBufB, reg); 502 } 503 504 static void 505 cuda_clear_tip(struct cuda_softc *sc) 506 { 507 uint8_t reg; 508 509 reg = cuda_read_reg(sc, vBufB); 510 reg |= vPB5; 511 cuda_write_reg(sc, vBufB, reg); 512 } 513 514 static void 515 cuda_in(struct cuda_softc *sc) 516 { 517 uint8_t reg; 518 519 reg = cuda_read_reg(sc, vACR); 520 reg &= ~vSR_OUT; 521 cuda_write_reg(sc, vACR, reg); 522 } 523 524 static void 525 cuda_out(struct cuda_softc *sc) 526 { 527 uint8_t reg; 528 529 reg = cuda_read_reg(sc, vACR); 530 reg |= vSR_OUT; 531 cuda_write_reg(sc, vACR, reg); 532 } 533 534 static void 535 cuda_toggle_ack(struct cuda_softc *sc) 536 { 537 uint8_t reg; 538 539 reg = cuda_read_reg(sc, vBufB); 540 reg ^= vPB4; 541 cuda_write_reg(sc, vBufB, reg); 542 } 543 544 static void 545 cuda_ack_off(struct cuda_softc *sc) 546 { 547 uint8_t reg; 548 549 reg = cuda_read_reg(sc, vBufB); 550 reg |= vPB4; 551 cuda_write_reg(sc, vBufB, reg); 552 } 553 554 static int 555 cuda_intr_state(struct cuda_softc *sc) 556 { 557 return ((cuda_read_reg(sc, vBufB) & vPB3) == 0); 558 } 559 560 static int 561 cuda_intr(void *arg) 562 { 563 struct cuda_softc *sc = arg; 564 int ending, type; 565 uint8_t reg; 566 567 reg = cuda_read_reg(sc, vIFR); /* Read the interrupts */ 568 DPRINTF("["); 569 if ((reg & 0x80) == 0) { 570 DPRINTF("irq %02x]", reg); 571 return 0; /* No interrupts to process */ 572 } 573 DPRINTF(":"); 574 575 cuda_write_reg(sc, vIFR, 0x7f); /* Clear 'em */ 576 577 switch_start: 578 switch (sc->sc_state) { 579 case CUDA_IDLE: 580 /* 581 * This is an unexpected packet, so grab the first (dummy) 582 * byte, set up the proper vars, and tell the chip we are 583 * starting to receive the packet by setting the TIP bit. 584 */ 585 sc->sc_in[1] = cuda_read_reg(sc, vSR); 586 DPRINTF("start: %02x", sc->sc_in[1]); 587 if (cuda_intr_state(sc) == 0) { 588 /* must have been a fake start */ 589 DPRINTF(" ... fake start\n"); 590 if (sc->sc_waiting) { 591 /* start over */ 592 delay(150); 593 sc->sc_state = CUDA_OUT; 594 sc->sc_sent = 0; 595 cuda_out(sc); 596 cuda_write_reg(sc, vSR, sc->sc_out[1]); 597 cuda_ack_off(sc); 598 cuda_tip(sc); 599 } 600 break; 601 } 602 603 cuda_in(sc); 604 cuda_tip(sc); 605 606 sc->sc_received = 1; 607 sc->sc_state = CUDA_IN; 608 DPRINTF(" CUDA_IN"); 609 break; 610 611 case CUDA_IN: 612 sc->sc_in[sc->sc_received] = cuda_read_reg(sc, vSR); 613 DPRINTF(" %02x", sc->sc_in[sc->sc_received]); 614 ending = 0; 615 if (sc->sc_received > 255) { 616 /* bitch only once */ 617 if (sc->sc_received == 256) { 618 aprint_error_dev(sc->sc_dev, 619 "input overflow\n"); 620 ending = 1; 621 } 622 } else 623 sc->sc_received++; 624 if (sc->sc_received > 3) { 625 if ((sc->sc_in[3] == CMD_IIC) && 626 (sc->sc_received > (sc->sc_i2c_read_len + 4))) { 627 ending = 1; 628 } 629 } 630 631 /* intr off means this is the last byte (end of frame) */ 632 if (cuda_intr_state(sc) == 0) { 633 ending = 1; 634 DPRINTF(".\n"); 635 } else { 636 cuda_toggle_ack(sc); 637 } 638 639 if (ending == 1) { /* end of message? */ 640 641 sc->sc_in[0] = sc->sc_received - 1; 642 643 /* reset vars and signal the end of this frame */ 644 cuda_idle(sc); 645 646 /* check if we have a handler for this message */ 647 type = sc->sc_in[1]; 648 if ((type >= 0) && (type < 16)) { 649 CudaHandler *me = &sc->sc_handlers[type]; 650 651 if (me->handler != NULL) { 652 me->handler(me->cookie, 653 sc->sc_received - 1, &sc->sc_in[1]); 654 } else { 655 aprint_error_dev(sc->sc_dev, 656 "no handler for type %02x\n", type); 657 panic("barf"); 658 } 659 } 660 661 DPRINTF("CUDA_IDLE"); 662 sc->sc_state = CUDA_IDLE; 663 664 sc->sc_received = 0; 665 666 /* 667 * If there is something waiting to be sent out, 668 * set everything up and send the first byte. 669 */ 670 if (sc->sc_waiting == 1) { 671 672 DPRINTF("pending write\n"); 673 delay(1500); /* required */ 674 sc->sc_sent = 0; 675 sc->sc_state = CUDA_OUT; 676 677 /* 678 * If the interrupt is on, we were too slow 679 * and the chip has already started to send 680 * something to us, so back out of the write 681 * and start a read cycle. 682 */ 683 if (cuda_intr_state(sc)) { 684 cuda_in(sc); 685 cuda_idle(sc); 686 sc->sc_sent = 0; 687 sc->sc_state = CUDA_IDLE; 688 sc->sc_received = 0; 689 delay(150); 690 DPRINTF("too slow - incoming message\n"); 691 goto switch_start; 692 } 693 /* 694 * If we got here, it's ok to start sending 695 * so load the first byte and tell the chip 696 * we want to send. 697 */ 698 DPRINTF("sending "); 699 700 cuda_out(sc); 701 cuda_write_reg(sc, vSR, 702 sc->sc_out[sc->sc_sent]); 703 cuda_ack_off(sc); 704 cuda_tip(sc); 705 } 706 } 707 break; 708 709 case CUDA_OUT: 710 (void)cuda_read_reg(sc, vSR); /* reset SR-intr in IFR */ 711 712 sc->sc_sent++; 713 if (cuda_intr_state(sc)) { /* ADB intr low during write */ 714 715 DPRINTF("incoming msg during send\n"); 716 cuda_in(sc); /* make sure SR is set to IN */ 717 cuda_idle(sc); 718 sc->sc_sent = 0; /* must start all over */ 719 sc->sc_state = CUDA_IDLE; /* new state */ 720 sc->sc_received = 0; 721 sc->sc_waiting = 1; /* must retry when done with 722 * read */ 723 delay(150); 724 goto switch_start; /* process next state right 725 * now */ 726 break; 727 } 728 if (sc->sc_out_length == sc->sc_sent) { /* check for done */ 729 730 sc->sc_waiting = 0; /* done writing */ 731 sc->sc_state = CUDA_IDLE; /* signal bus is idle */ 732 cuda_in(sc); 733 cuda_idle(sc); 734 DPRINTF("done sending\n"); 735 } else { 736 /* send next byte */ 737 cuda_write_reg(sc, vSR, sc->sc_out[sc->sc_sent]); 738 DPRINTF("%02x", sc->sc_out[sc->sc_sent]); 739 cuda_toggle_ack(sc); /* signal byte ready to 740 * shift */ 741 } 742 break; 743 744 case CUDA_NOTREADY: 745 DPRINTF("adb: not yet initialized\n"); 746 break; 747 748 default: 749 DPRINTF("intr: unknown ADB state\n"); 750 break; 751 } 752 753 DPRINTF("]"); 754 return 1; 755 } 756 757 static int 758 cuda_error_handler(void *cookie, int len, uint8_t *data) 759 { 760 struct cuda_softc *sc = cookie; 761 762 /* 763 * something went wrong 764 * byte 3 seems to be the failed command 765 */ 766 sc->sc_error = 1; 767 DPRINTF("cuda error %02x %02x %02x %02x\n", data[0], data[1], data[2], data[3]); 768 cv_signal(&sc->sc_todev); 769 return 0; 770 } 771 772 773 /* real time clock */ 774 775 static int 776 cuda_todr_handler(void *cookie, int len, uint8_t *data) 777 { 778 struct cuda_softc *sc = cookie; 779 780 #ifdef CUDA_DEBUG 781 int i; 782 printf("msg: %02x", data[0]); 783 for (i = 1; i < len; i++) { 784 printf(" %02x", data[i]); 785 } 786 printf("\n"); 787 #endif 788 789 switch(data[2]) { 790 case CMD_READ_RTC: 791 memcpy(&sc->sc_tod, &data[3], 4); 792 break; 793 case CMD_WRITE_RTC: 794 sc->sc_tod = 0xffffffff; 795 break; 796 case CMD_AUTOPOLL: 797 sc->sc_autopoll = 1; 798 break; 799 case CMD_IIC: 800 sc->sc_iic_done = len; 801 break; 802 } 803 cv_signal(&sc->sc_todev); 804 return 0; 805 } 806 807 #define DIFF19041970 2082844800 808 809 static int 810 cuda_todr_get(todr_chip_handle_t tch, struct timeval *tvp) 811 { 812 struct cuda_softc *sc = device_private(tch->todr_dev); 813 int cnt = 0; 814 uint8_t cmd[] = { CUDA_PSEUDO, CMD_READ_RTC}; 815 816 sc->sc_tod = 0; 817 while (sc->sc_tod == 0) { 818 cuda_send(sc, 0, 2, cmd); 819 820 while ((sc->sc_tod == 0) && (cnt < 10)) { 821 mutex_enter(&sc->sc_todevmtx); 822 cv_timedwait(&sc->sc_todev, &sc->sc_todevmtx, hz); 823 mutex_exit(&sc->sc_todevmtx); 824 825 cnt++; 826 } 827 828 if (sc->sc_tod == 0) { 829 aprint_error_dev(sc->sc_dev, 830 "unable to read a sane RTC value\n"); 831 return EIO; 832 } 833 if ((sc->sc_tod > 0xf0000000UL) || 834 (sc->sc_tod < DIFF19041970)) { 835 /* huh? try again */ 836 sc->sc_tod = 0; 837 aprint_verbose_dev(sc->sc_dev, 838 "got garbage reading RTC, trying again\n"); 839 } 840 } 841 842 tvp->tv_sec = sc->sc_tod - DIFF19041970; 843 DPRINTF("tod: %" PRIo64 "\n", tvp->tv_sec); 844 tvp->tv_usec = 0; 845 return 0; 846 } 847 848 static int 849 cuda_todr_set(todr_chip_handle_t tch, struct timeval *tvp) 850 { 851 struct cuda_softc *sc = device_private(tch->todr_dev); 852 uint32_t sec; 853 uint8_t cmd[] = {CUDA_PSEUDO, CMD_WRITE_RTC, 0, 0, 0, 0}; 854 855 sec = tvp->tv_sec + DIFF19041970; 856 memcpy(&cmd[2], &sec, 4); 857 sc->sc_tod = 0; 858 if (cuda_send(sc, 0, 6, cmd) == 0) { 859 while (sc->sc_tod == 0) { 860 mutex_enter(&sc->sc_todevmtx); 861 cv_timedwait(&sc->sc_todev, &sc->sc_todevmtx, hz); 862 mutex_exit(&sc->sc_todevmtx); 863 } 864 return 0; 865 } 866 aprint_error_dev(sc->sc_dev, "%s failed\n", __func__); 867 return -1; 868 869 } 870 871 /* poweroff and reboot */ 872 873 void 874 cuda_poweroff(void) 875 { 876 struct cuda_softc *sc; 877 uint8_t cmd[] = {CUDA_PSEUDO, CMD_POWEROFF}; 878 879 if (cuda0 == NULL) 880 return; 881 sc = cuda0->cookie; 882 sc->sc_polling = 1; 883 cuda0->poll(sc); 884 if (cuda0->send(sc, 1, 2, cmd) == 0) 885 while (1); 886 } 887 888 void 889 cuda_restart(void) 890 { 891 struct cuda_softc *sc; 892 uint8_t cmd[] = {CUDA_PSEUDO, CMD_RESET}; 893 894 if (cuda0 == NULL) 895 return; 896 sc = cuda0->cookie; 897 sc->sc_polling = 1; 898 cuda0->poll(sc); 899 if (cuda0->send(sc, 1, 2, cmd) == 0) 900 while (1); 901 } 902 903 /* ADB message handling */ 904 905 static void 906 cuda_autopoll(void *cookie, int flag) 907 { 908 struct cuda_softc *sc = cookie; 909 uint8_t cmd[] = {CUDA_PSEUDO, CMD_AUTOPOLL, (flag != 0)}; 910 911 if (cmd[2] == sc->sc_autopoll) 912 return; 913 914 sc->sc_autopoll = -1; 915 cuda_send(sc, 0, 3, cmd); 916 while(sc->sc_autopoll == -1) { 917 if (sc->sc_polling || cold) { 918 cuda_poll(sc); 919 } else { 920 mutex_enter(&sc->sc_todevmtx); 921 cv_timedwait(&sc->sc_todev, &sc->sc_todevmtx, hz); 922 mutex_exit(&sc->sc_todevmtx); 923 } 924 } 925 } 926 927 static int 928 cuda_adb_handler(void *cookie, int len, uint8_t *data) 929 { 930 struct cuda_softc *sc = cookie; 931 932 if (sc->sc_adb_handler != NULL) { 933 sc->sc_adb_handler(sc->sc_adb_cookie, len - 1, 934 &data[1]); 935 return 0; 936 } 937 return -1; 938 } 939 940 static int 941 cuda_adb_send(void *cookie, int poll, int command, int len, uint8_t *data) 942 { 943 struct cuda_softc *sc = cookie; 944 int i, s = 0; 945 uint8_t packet[16]; 946 947 /* construct an ADB command packet and send it */ 948 packet[0] = CUDA_ADB; 949 packet[1] = command; 950 for (i = 0; i < len; i++) 951 packet[i + 2] = data[i]; 952 if (poll || cold) { 953 s = splhigh(); 954 cuda_poll(sc); 955 } 956 cuda_send(sc, poll, len + 2, packet); 957 if (poll || cold) { 958 cuda_poll(sc); 959 splx(s); 960 } 961 return 0; 962 } 963 964 static int 965 cuda_adb_set_handler(void *cookie, void (*handler)(void *, int, uint8_t *), 966 void *hcookie) 967 { 968 struct cuda_softc *sc = cookie; 969 970 /* register a callback for incoming ADB messages */ 971 sc->sc_adb_handler = handler; 972 sc->sc_adb_cookie = hcookie; 973 return 0; 974 } 975 976 /* i2c message handling */ 977 978 static int 979 cuda_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *_send, 980 size_t send_len, void *_recv, size_t recv_len, int flags) 981 { 982 struct cuda_softc *sc = cookie; 983 const uint8_t *send = _send; 984 uint8_t *recv = _recv; 985 uint8_t command[16] = {CUDA_PSEUDO, CMD_IIC}; 986 987 DPRINTF("cuda_i2c_exec(%02x)\n", addr); 988 command[2] = addr; 989 990 /* Copy command and output data bytes, if any, to buffer */ 991 if (send_len > 0) 992 memcpy(&command[3], send, uimin((int)send_len, 12)); 993 else if (I2C_OP_READ_P(op) && (recv_len == 0)) { 994 /* 995 * If no data bytes in either direction, it's a "quick" 996 * i2c operation. We don't know how to do a quick_read 997 * since that requires us to set the low bit of the 998 * address byte after it has been left-shifted. 999 */ 1000 sc->sc_error = 0; 1001 return -1; 1002 } 1003 1004 sc->sc_iic_done = 0; 1005 cuda_send(sc, sc->sc_polling, send_len + 3, command); 1006 1007 while ((sc->sc_iic_done == 0) && (sc->sc_error == 0)) { 1008 if (sc->sc_polling || cold) { 1009 cuda_poll(sc); 1010 } else { 1011 mutex_enter(&sc->sc_todevmtx); 1012 cv_timedwait(&sc->sc_todev, &sc->sc_todevmtx, hz); 1013 mutex_exit(&sc->sc_todevmtx); 1014 } 1015 } 1016 1017 if (sc->sc_error) { 1018 sc->sc_error = 0; 1019 aprint_error_dev(sc->sc_dev, "error doing I2C\n"); 1020 return -1; 1021 } 1022 1023 /* see if we're supposed to do a read */ 1024 if (recv_len > 0) { 1025 sc->sc_iic_done = 0; 1026 command[2] |= 1; 1027 command[3] = 0; 1028 1029 /* 1030 * XXX we need to do something to limit the size of the answer 1031 * - apparently the chip keeps sending until we tell it to stop 1032 */ 1033 sc->sc_i2c_read_len = recv_len; 1034 DPRINTF("rcv_len: %d\n", recv_len); 1035 cuda_send(sc, sc->sc_polling, 3, command); 1036 while ((sc->sc_iic_done == 0) && (sc->sc_error == 0)) { 1037 if (sc->sc_polling || cold) { 1038 cuda_poll(sc); 1039 } else { 1040 mutex_enter(&sc->sc_todevmtx); 1041 cv_timedwait(&sc->sc_todev, &sc->sc_todevmtx, hz); 1042 mutex_exit(&sc->sc_todevmtx); 1043 } 1044 } 1045 1046 if (sc->sc_error) { 1047 aprint_error_dev(sc->sc_dev, 1048 "error trying to read from I2C\n"); 1049 sc->sc_error = 0; 1050 return -1; 1051 } 1052 } 1053 1054 DPRINTF("received: %d\n", sc->sc_iic_done); 1055 if ((sc->sc_iic_done > 3) && (recv_len > 0)) { 1056 int rlen; 1057 1058 /* we got an answer */ 1059 rlen = uimin(sc->sc_iic_done - 3, recv_len); 1060 memcpy(recv, &sc->sc_in[4], rlen); 1061 #ifdef CUDA_DEBUG 1062 { 1063 int i; 1064 printf("ret:"); 1065 for (i = 0; i < rlen; i++) 1066 printf(" %02x", recv[i]); 1067 printf("\n"); 1068 } 1069 #endif 1070 return rlen; 1071 } 1072 return 0; 1073 } 1074
Indexes created Tue Sep 30 11:09:46 GMT 2025