kernel/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c

   1 /*
   2  * Copyright 2013 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include "priv.h"
  25 #include "pad.h"
  26
  27 #include <core/device.h>
  28 #include <core/notify.h>
  29 #include <core/option.h>
  30 #include <subdev/bios.h>
  31 #include <subdev/bios/dcb.h>
  32
  33 /******************************************************************************
  34  * interface to linux i2c bit-banging algorithm
  35  *****************************************************************************/
  36
  37 #ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
  38 #define CSTMSEL true
  39 #else
  40 #define CSTMSEL false
  41 #endif
  42
  43 static int
  44 nvkm_i2c_pre_xfer(struct i2c_adapter *adap)
  45 {
  46         struct i2c_algo_bit_data *bit = adap->algo_data;
  47         struct nvkm_i2c_port *port = bit->data;
  48         return nvkm_i2c(port)->acquire(port, bit->timeout);
  49 }
  50
  51 static void
  52 nvkm_i2c_post_xfer(struct i2c_adapter *adap)
  53 {
  54         struct i2c_algo_bit_data *bit = adap->algo_data;
  55         struct nvkm_i2c_port *port = bit->data;
  56         return nvkm_i2c(port)->release(port);
  57 }
  58
  59 static void
  60 nvkm_i2c_setscl(void *data, int state)
  61 {
  62         struct nvkm_i2c_port *port = data;
  63         port->func->drive_scl(port, state);
  64 }
  65
  66 static void
  67 nvkm_i2c_setsda(void *data, int state)
  68 {
  69         struct nvkm_i2c_port *port = data;
  70         port->func->drive_sda(port, state);
  71 }
  72
  73 static int
  74 nvkm_i2c_getscl(void *data)
  75 {
  76         struct nvkm_i2c_port *port = data;
  77         return port->func->sense_scl(port);
  78 }
  79
  80 static int
  81 nvkm_i2c_getsda(void *data)
  82 {
  83         struct nvkm_i2c_port *port = data;
  84         return port->func->sense_sda(port);
  85 }
  86
  87 /******************************************************************************
  88  * base i2c "port" class implementation
  89  *****************************************************************************/
  90
  91 int
  92 _nvkm_i2c_port_fini(struct nvkm_object *object, bool suspend)
  93 {
  94         struct nvkm_i2c_port *port = (void *)object;
  95         struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
  96         nv_ofuncs(pad)->fini(nv_object(pad), suspend);
  97         return nvkm_object_fini(&port->base, suspend);
  98 }
  99
 100 void
 101 _nvkm_i2c_port_dtor(struct nvkm_object *object)
 102 {
 103         struct nvkm_i2c_port *port = (void *)object;
 104         i2c_del_adapter(&port->adapter);
 105         nvkm_object_destroy(&port->base);
 106 }
 107
 108 int
 109 nvkm_i2c_port_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 110                       struct nvkm_oclass *oclass, u8 index,
 111                       const struct i2c_algorithm *algo,
 112                       const struct nvkm_i2c_func *func,
 113                       int size, void **pobject)
 114 {
 115         struct nvkm_device *device = nv_device(parent);
 116         struct nvkm_i2c *i2c = nvkm_i2c(parent);
 117         struct nvkm_i2c_port *port;
 118         int ret;
 119
 120         ret = nvkm_object_create_(parent, engine, oclass, 0, size, pobject);
 121         port = *pobject;
 122         if (ret)
 123                 return ret;
 124
 125         snprintf(port->adapter.name, sizeof(port->adapter.name),
 126                  "nvkm-%s-%d", device->name, index);
 127         port->adapter.owner = THIS_MODULE;
 128         port->adapter.dev.parent = nv_device_base(device);
 129         port->index = index;
 130         port->aux = -1;
 131         port->func = func;
 132         mutex_init(&port->mutex);
 133
 134         if ( algo == &nvkm_i2c_bit_algo &&
 135             !nvkm_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) {
 136                 struct i2c_algo_bit_data *bit;
 137
 138                 bit = kzalloc(sizeof(*bit), GFP_KERNEL);
 139                 if (!bit)
 140                         return -ENOMEM;
 141
 142                 bit->udelay = 10;
 143                 bit->timeout = usecs_to_jiffies(2200);
 144                 bit->data = port;
 145                 bit->pre_xfer = nvkm_i2c_pre_xfer;
 146                 bit->post_xfer = nvkm_i2c_post_xfer;
 147                 bit->setsda = nvkm_i2c_setsda;
 148                 bit->setscl = nvkm_i2c_setscl;
 149                 bit->getsda = nvkm_i2c_getsda;
 150                 bit->getscl = nvkm_i2c_getscl;
 151
 152                 port->adapter.algo_data = bit;
 153                 ret = i2c_bit_add_bus(&port->adapter);
 154         } else {
 155                 port->adapter.algo_data = port;
 156                 port->adapter.algo = algo;
 157                 ret = i2c_add_adapter(&port->adapter);
 158         }
 159
 160         if (ret == 0)
 161                 list_add_tail(&port->head, &i2c->ports);
 162         return ret;
 163 }
 164
 165 /******************************************************************************
 166  * base i2c subdev class implementation
 167  *****************************************************************************/
 168
 169 static struct nvkm_i2c_port *
 170 nvkm_i2c_find(struct nvkm_i2c *i2c, u8 index)
 171 {
 172         struct nvkm_bios *bios = nvkm_bios(i2c);
 173         struct nvkm_i2c_port *port;
 174
 175         if (index == NV_I2C_DEFAULT(0) ||
 176             index == NV_I2C_DEFAULT(1)) {
 177                 u8  ver, hdr, cnt, len;
 178                 u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
 179                 if (i2c && ver >= 0x30) {
 180                         u8 auxidx = nv_ro08(bios, i2c + 4);
 181                         if (index == NV_I2C_DEFAULT(0))
 182                                 index = (auxidx & 0x0f) >> 0;
 183                         else
 184                                 index = (auxidx & 0xf0) >> 4;
 185                 } else {
 186                         index = 2;
 187                 }
 188         }
 189
 190         list_for_each_entry(port, &i2c->ports, head) {
 191                 if (port->index == index)
 192                         return port;
 193         }
 194
 195         return NULL;
 196 }
 197
 198 static struct nvkm_i2c_port *
 199 nvkm_i2c_find_type(struct nvkm_i2c *i2c, u16 type)
 200 {
 201         struct nvkm_i2c_port *port;
 202
 203         list_for_each_entry(port, &i2c->ports, head) {
 204                 if (nv_hclass(port) == type)
 205                         return port;
 206         }
 207
 208         return NULL;
 209 }
 210
 211 static void
 212 nvkm_i2c_release_pad(struct nvkm_i2c_port *port)
 213 {
 214         struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
 215         struct nvkm_i2c *i2c = nvkm_i2c(port);
 216
 217         if (atomic_dec_and_test(&nv_object(pad)->usecount)) {
 218                 nv_ofuncs(pad)->fini(nv_object(pad), false);
 219                 wake_up_all(&i2c->wait);
 220         }
 221 }
 222
 223 static int
 224 nvkm_i2c_try_acquire_pad(struct nvkm_i2c_port *port)
 225 {
 226         struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
 227
 228         if (atomic_add_return(1, &nv_object(pad)->usecount) != 1) {
 229                 struct nvkm_object *owner = (void *)pad->port;
 230                 do {
 231                         if (owner == (void *)port)
 232                                 return 0;
 233                         owner = owner->parent;
 234                 } while(owner);
 235                 nvkm_i2c_release_pad(port);
 236                 return -EBUSY;
 237         }
 238
 239         pad->next = port;
 240         nv_ofuncs(pad)->init(nv_object(pad));
 241         return 0;
 242 }
 243
 244 static int
 245 nvkm_i2c_acquire_pad(struct nvkm_i2c_port *port, unsigned long timeout)
 246 {
 247         struct nvkm_i2c *i2c = nvkm_i2c(port);
 248
 249         if (timeout) {
 250                 if (wait_event_timeout(i2c->wait,
 251                                        nvkm_i2c_try_acquire_pad(port) == 0,
 252                                        timeout) == 0)
 253                         return -EBUSY;
 254         } else {
 255                 wait_event(i2c->wait, nvkm_i2c_try_acquire_pad(port) == 0);
 256         }
 257
 258         return 0;
 259 }
 260
 261 static void
 262 nvkm_i2c_release(struct nvkm_i2c_port *port)
 263 __releases(pad->mutex)
 264 {
 265         nvkm_i2c(port)->release_pad(port);
 266         mutex_unlock(&port->mutex);
 267 }
 268
 269 static int
 270 nvkm_i2c_acquire(struct nvkm_i2c_port *port, unsigned long timeout)
 271 __acquires(pad->mutex)
 272 {
 273         int ret;
 274         mutex_lock(&port->mutex);
 275         if ((ret = nvkm_i2c(port)->acquire_pad(port, timeout)))
 276                 mutex_unlock(&port->mutex);
 277         return ret;
 278 }
 279
 280 static int
 281 nvkm_i2c_identify(struct nvkm_i2c *i2c, int index, const char *what,
 282                   struct nvkm_i2c_board_info *info,
 283                   bool (*match)(struct nvkm_i2c_port *,
 284                                 struct i2c_board_info *, void *), void *data)
 285 {
 286         struct nvkm_i2c_port *port = nvkm_i2c_find(i2c, index);
 287         int i;
 288
 289         if (!port) {
 290                 nv_debug(i2c, "no bus when probing %s on %d\n", what, index);
 291                 return -ENODEV;
 292         }
 293
 294         nv_debug(i2c, "probing %ss on bus: %d\n", what, port->index);
 295         for (i = 0; info[i].dev.addr; i++) {
 296                 u8 orig_udelay = 0;
 297
 298                 if ((port->adapter.algo == &i2c_bit_algo) &&
 299                     (info[i].udelay != 0)) {
 300                         struct i2c_algo_bit_data *algo = port->adapter.algo_data;
 301                         nv_debug(i2c, "using custom udelay %d instead of %d\n",
 302                                  info[i].udelay, algo->udelay);
 303                         orig_udelay = algo->udelay;
 304                         algo->udelay = info[i].udelay;
 305                 }
 306
 307                 if (nv_probe_i2c(port, info[i].dev.addr) &&
 308                     (!match || match(port, &info[i].dev, data))) {
 309                         nv_info(i2c, "detected %s: %s\n", what,
 310                                 info[i].dev.type);
 311                         return i;
 312                 }
 313
 314                 if (orig_udelay) {
 315                         struct i2c_algo_bit_data *algo = port->adapter.algo_data;
 316                         algo->udelay = orig_udelay;
 317                 }
 318         }
 319
 320         nv_debug(i2c, "no devices found.\n");
 321         return -ENODEV;
 322 }
 323
 324 static void
 325 nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int index)
 326 {
 327         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
 328         struct nvkm_i2c_port *port = i2c->find(i2c, index);
 329         const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass;
 330         if (port && port->aux >= 0)
 331                 impl->aux_mask(i2c, type, 1 << port->aux, 0);
 332 }
 333
 334 static void
 335 nvkm_i2c_intr_init(struct nvkm_event *event, int type, int index)
 336 {
 337         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
 338         struct nvkm_i2c_port *port = i2c->find(i2c, index);
 339         const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass;
 340         if (port && port->aux >= 0)
 341                 impl->aux_mask(i2c, type, 1 << port->aux, 1 << port->aux);
 342 }
 343
 344 static int
 345 nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size,
 346                       struct nvkm_notify *notify)
 347 {
 348         struct nvkm_i2c_ntfy_req *req = data;
 349         if (!WARN_ON(size != sizeof(*req))) {
 350                 notify->size  = sizeof(struct nvkm_i2c_ntfy_rep);
 351                 notify->types = req->mask;
 352                 notify->index = req->port;
 353                 return 0;
 354         }
 355         return -EINVAL;
 356 }
 357
 358 static void
 359 nvkm_i2c_intr(struct nvkm_subdev *subdev)
 360 {
 361         struct nvkm_i2c_impl *impl = (void *)nv_oclass(subdev);
 362         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 363         struct nvkm_i2c_port *port;
 364         u32 hi, lo, rq, tx, e;
 365
 366         if (impl->aux_stat) {
 367                 impl->aux_stat(i2c, &hi, &lo, &rq, &tx);
 368                 if (hi || lo || rq || tx) {
 369                         list_for_each_entry(port, &i2c->ports, head) {
 370                                 if (e = 0, port->aux < 0)
 371                                         continue;
 372
 373                                 if (hi & (1 << port->aux)) e |= NVKM_I2C_PLUG;
 374                                 if (lo & (1 << port->aux)) e |= NVKM_I2C_UNPLUG;
 375                                 if (rq & (1 << port->aux)) e |= NVKM_I2C_IRQ;
 376                                 if (tx & (1 << port->aux)) e |= NVKM_I2C_DONE;
 377                                 if (e) {
 378                                         struct nvkm_i2c_ntfy_rep rep = {
 379                                                 .mask = e,
 380                                         };
 381                                         nvkm_event_send(&i2c->event, rep.mask,
 382                                                         port->index, &rep,
 383                                                         sizeof(rep));
 384                                 }
 385                         }
 386                 }
 387         }
 388 }
 389
 390 static const struct nvkm_event_func
 391 nvkm_i2c_intr_func = {
 392         .ctor = nvkm_i2c_intr_ctor,
 393         .init = nvkm_i2c_intr_init,
 394         .fini = nvkm_i2c_intr_fini,
 395 };
 396
 397 int
 398 _nvkm_i2c_fini(struct nvkm_object *object, bool suspend)
 399 {
 400         struct nvkm_i2c_impl *impl = (void *)nv_oclass(object);
 401         struct nvkm_i2c *i2c = (void *)object;
 402         struct nvkm_i2c_port *port;
 403         u32 mask;
 404         int ret;
 405
 406         list_for_each_entry(port, &i2c->ports, head) {
 407                 ret = nv_ofuncs(port)->fini(nv_object(port), suspend);
 408                 if (ret && suspend)
 409                         goto fail;
 410         }
 411
 412         if ((mask = (1 << impl->aux) - 1), impl->aux_stat) {
 413                 impl->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
 414                 impl->aux_stat(i2c, &mask, &mask, &mask, &mask);
 415         }
 416
 417         return nvkm_subdev_fini(&i2c->base, suspend);
 418 fail:
 419         list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
 420                 nv_ofuncs(port)->init(nv_object(port));
 421         }
 422
 423         return ret;
 424 }
 425
 426 int
 427 _nvkm_i2c_init(struct nvkm_object *object)
 428 {
 429         struct nvkm_i2c *i2c = (void *)object;
 430         struct nvkm_i2c_port *port;
 431         int ret;
 432
 433         ret = nvkm_subdev_init(&i2c->base);
 434         if (ret == 0) {
 435                 list_for_each_entry(port, &i2c->ports, head) {
 436                         ret = nv_ofuncs(port)->init(nv_object(port));
 437                         if (ret)
 438                                 goto fail;
 439                 }
 440         }
 441
 442         return ret;
 443 fail:
 444         list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
 445                 nv_ofuncs(port)->fini(nv_object(port), false);
 446         }
 447
 448         return ret;
 449 }
 450
 451 void
 452 _nvkm_i2c_dtor(struct nvkm_object *object)
 453 {
 454         struct nvkm_i2c *i2c = (void *)object;
 455         struct nvkm_i2c_port *port, *temp;
 456
 457         nvkm_event_fini(&i2c->event);
 458
 459         list_for_each_entry_safe(port, temp, &i2c->ports, head) {
 460                 nvkm_object_ref(NULL, (struct nvkm_object **)&port);
 461         }
 462
 463         nvkm_subdev_destroy(&i2c->base);
 464 }
 465
 466 static struct nvkm_oclass *
 467 nvkm_i2c_extdev_sclass[] = {
 468         nvkm_anx9805_sclass,
 469 };
 470
 471 static void
 472 nvkm_i2c_create_port(struct nvkm_i2c *i2c, int index, u8 type,
 473                      struct dcb_i2c_entry *info)
 474 {
 475         const struct nvkm_i2c_impl *impl = (void *)nv_oclass(i2c);
 476         struct nvkm_oclass *oclass;
 477         struct nvkm_object *parent;
 478         struct nvkm_object *object;
 479         int ret, pad;
 480
 481         if (info->share != DCB_I2C_UNUSED) {
 482                 pad    = info->share;
 483                 oclass = impl->pad_s;
 484         } else {
 485                 if (type != DCB_I2C_NVIO_AUX)
 486                         pad = 0x100 + info->drive;
 487                 else
 488                         pad = 0x100 + info->auxch;
 489                 oclass = impl->pad_x;
 490         }
 491
 492         ret = nvkm_object_ctor(nv_object(i2c), NULL, oclass,
 493                                NULL, pad, &parent);
 494         if (ret < 0)
 495                 return;
 496
 497         oclass = impl->sclass;
 498         do {
 499                 ret = -EINVAL;
 500                 if (oclass->handle == type) {
 501                         ret = nvkm_object_ctor(parent, NULL, oclass,
 502                                                info, index, &object);
 503                 }
 504         } while (ret && (++oclass)->handle);
 505
 506         nvkm_object_ref(NULL, &parent);
 507 }
 508
 509 int
 510 nvkm_i2c_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 511                  struct nvkm_oclass *oclass, int length, void **pobject)
 512 {
 513         struct nvkm_bios *bios = nvkm_bios(parent);
 514         struct nvkm_i2c *i2c;
 515         struct nvkm_object *object;
 516         struct dcb_i2c_entry info;
 517         int ret, i, j, index = -1;
 518         struct dcb_output outp;
 519         u8  ver, hdr;
 520         u32 data;
 521
 522         ret = nvkm_subdev_create(parent, engine, oclass, 0, "I2C", "i2c", &i2c);
 523         *pobject = nv_object(i2c);
 524         if (ret)
 525                 return ret;
 526
 527         nv_subdev(i2c)->intr = nvkm_i2c_intr;
 528         i2c->find = nvkm_i2c_find;
 529         i2c->find_type = nvkm_i2c_find_type;
 530         i2c->acquire_pad = nvkm_i2c_acquire_pad;
 531         i2c->release_pad = nvkm_i2c_release_pad;
 532         i2c->acquire = nvkm_i2c_acquire;
 533         i2c->release = nvkm_i2c_release;
 534         i2c->identify = nvkm_i2c_identify;
 535         init_waitqueue_head(&i2c->wait);
 536         INIT_LIST_HEAD(&i2c->ports);
 537
 538         while (!dcb_i2c_parse(bios, ++index, &info)) {
 539                 switch (info.type) {
 540                 case DCB_I2C_NV04_BIT:
 541                 case DCB_I2C_NV4E_BIT:
 542                 case DCB_I2C_NVIO_BIT:
 543                         nvkm_i2c_create_port(i2c, NV_I2C_PORT(index),
 544                                              info.type, &info);
 545                         break;
 546                 case DCB_I2C_NVIO_AUX:
 547                         nvkm_i2c_create_port(i2c, NV_I2C_AUX(index),
 548                                              info.type, &info);
 549                         break;
 550                 case DCB_I2C_PMGR:
 551                         if (info.drive != DCB_I2C_UNUSED) {
 552                                 nvkm_i2c_create_port(i2c, NV_I2C_PORT(index),
 553                                                      DCB_I2C_NVIO_BIT, &info);
 554                         }
 555                         if (info.auxch != DCB_I2C_UNUSED) {
 556                                 nvkm_i2c_create_port(i2c, NV_I2C_AUX(index),
 557                                                      DCB_I2C_NVIO_AUX, &info);
 558                         }
 559                         break;
 560                 case DCB_I2C_UNUSED:
 561                 default:
 562                         continue;
 563                 }
 564         }
 565
 566         /* in addition to the busses specified in the i2c table, there
 567          * may be ddc/aux channels hiding behind external tmds/dp/etc
 568          * transmitters.
 569          */
 570         index = NV_I2C_EXT(0);
 571         i = -1;
 572         while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) {
 573                 if (!outp.location || !outp.extdev)
 574                         continue;
 575
 576                 switch (outp.type) {
 577                 case DCB_OUTPUT_TMDS:
 578                         info.type = NV_I2C_TYPE_EXTDDC(outp.extdev);
 579                         break;
 580                 case DCB_OUTPUT_DP:
 581                         info.type = NV_I2C_TYPE_EXTAUX(outp.extdev);
 582                         break;
 583                 default:
 584                         continue;
 585                 }
 586
 587                 ret = -ENODEV;
 588                 j = -1;
 589                 while (ret && ++j < ARRAY_SIZE(nvkm_i2c_extdev_sclass)) {
 590                         parent = nv_object(i2c->find(i2c, outp.i2c_index));
 591                         oclass = nvkm_i2c_extdev_sclass[j];
 592                         do {
 593                                 if (oclass->handle != info.type)
 594                                         continue;
 595                                 ret = nvkm_object_ctor(parent, NULL, oclass,
 596                                                        NULL, index++, &object);
 597                         } while (ret && (++oclass)->handle);
 598                 }
 599         }
 600
 601         ret = nvkm_event_init(&nvkm_i2c_intr_func, 4, index, &i2c->event);
 602         if (ret)
 603                 return ret;
 604
 605         return 0;
 606 }
 607
 608 int
 609 _nvkm_i2c_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 610                struct nvkm_oclass *oclass, void *data, u32 size,
 611                struct nvkm_object **pobject)
 612 {
 613         struct nvkm_i2c *i2c;
 614         int ret;
 615
 616         ret = nvkm_i2c_create(parent, engine, oclass, &i2c);
 617         *pobject = nv_object(i2c);
 618         if (ret)
 619                 return ret;
 620
 621         return 0;
 622 }