pscnv/nouveau_iic.c

   1 /*
   2  * Copyright 2009 Red Hat Inc.
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  * Copyright © 2006-2008,2010 Intel Corporation
   5  *   Jesse Barnes <jesse.barnes@intel.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  *
  30  * Copyright (c) 2011 The FreeBSD Foundation
  31  * All rights reserved.
  32  *
  33  * This software was developed by Konstantin Belousov under sponsorship from
  34  * the FreeBSD Foundation.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #include "nouveau_drv.h"
  59 #include "nouveau_reg.h"
  60 #include "nouveau_i2c.h"
  61 #include "nouveau_hw.h"
  62
  63 static void
  64 nv04_i2c_setscl(void *data, int state)
  65 {
  66         struct nouveau_i2c_chan *i2c = data;
  67         struct drm_device *dev = i2c->dev;
  68         uint8_t val;
  69
  70         val = (NVReadVgaCrtc(dev, 0, i2c->wr) & 0xd0) | (state ? 0x20 : 0);
  71         NVWriteVgaCrtc(dev, 0, i2c->wr, val | 0x01);
  72 }
  73
  74 static void
  75 nv04_i2c_setsda(void *data, int state)
  76 {
  77         struct nouveau_i2c_chan *i2c = data;
  78         struct drm_device *dev = i2c->dev;
  79         uint8_t val;
  80
  81         val = (NVReadVgaCrtc(dev, 0, i2c->wr) & 0xe0) | (state ? 0x10 : 0);
  82         NVWriteVgaCrtc(dev, 0, i2c->wr, val | 0x01);
  83 }
  84
  85 static int
  86 nv04_i2c_getscl(void *data)
  87 {
  88         struct nouveau_i2c_chan *i2c = data;
  89         struct drm_device *dev = i2c->dev;
  90
  91         return !!(NVReadVgaCrtc(dev, 0, i2c->rd) & 4);
  92 }
  93
  94 static int
  95 nv04_i2c_getsda(void *data)
  96 {
  97         struct nouveau_i2c_chan *i2c = data;
  98         struct drm_device *dev = i2c->dev;
  99
 100         return !!(NVReadVgaCrtc(dev, 0, i2c->rd) & 8);
 101 }
 102
 103 static void
 104 nv4e_i2c_setscl(void *data, int state)
 105 {
 106         struct nouveau_i2c_chan *i2c = data;
 107         struct drm_device *dev = i2c->dev;
 108         uint8_t val;
 109
 110         val = (nv_rd32(dev, i2c->wr) & 0xd0) | (state ? 0x20 : 0);
 111         nv_wr32(dev, i2c->wr, val | 0x01);
 112 }
 113
 114 static void
 115 nv4e_i2c_setsda(void *data, int state)
 116 {
 117         struct nouveau_i2c_chan *i2c = data;
 118         struct drm_device *dev = i2c->dev;
 119         uint8_t val;
 120
 121         val = (nv_rd32(dev, i2c->wr) & 0xe0) | (state ? 0x10 : 0);
 122         nv_wr32(dev, i2c->wr, val | 0x01);
 123 }
 124
 125 static int
 126 nv4e_i2c_getscl(void *data)
 127 {
 128         struct nouveau_i2c_chan *i2c = data;
 129         struct drm_device *dev = i2c->dev;
 130
 131         return !!((nv_rd32(dev, i2c->rd) >> 16) & 4);
 132 }
 133
 134 static int
 135 nv4e_i2c_getsda(void *data)
 136 {
 137         struct nouveau_i2c_chan *i2c = data;
 138         struct drm_device *dev = i2c->dev;
 139
 140         return !!((nv_rd32(dev, i2c->rd) >> 16) & 8);
 141 }
 142
 143 static int
 144 nv50_i2c_getscl(void *data)
 145 {
 146         struct nouveau_i2c_chan *i2c = data;
 147         struct drm_device *dev = i2c->dev;
 148
 149         return !!(nv_rd32(dev, i2c->rd) & 1);
 150 }
 151
 152
 153 static int
 154 nv50_i2c_getsda(void *data)
 155 {
 156         struct nouveau_i2c_chan *i2c = data;
 157         struct drm_device *dev = i2c->dev;
 158
 159         return !!(nv_rd32(dev, i2c->rd) & 2);
 160 }
 161
 162 static void
 163 nv50_i2c_setscl(void *data, int state)
 164 {
 165         struct nouveau_i2c_chan *i2c = data;
 166         struct drm_device *dev = i2c->dev;
 167
 168         nv_wr32(dev, i2c->wr, 4 | (i2c->data ? 2 : 0) | (state ? 1 : 0));
 169 }
 170
 171 static void
 172 nv50_i2c_setsda(void *data, int state)
 173 {
 174         struct nouveau_i2c_chan *i2c = data;
 175         struct drm_device *dev = i2c->dev;
 176
 177         nv_wr32(dev, i2c->wr,
 178                         (nv_rd32(dev, i2c->rd) & 1) | 4 | (state ? 2 : 0));
 179         i2c->data = state;
 180 }
 181
 182 static int
 183 nvd0_i2c_getscl(void *data)
 184 {
 185         struct nouveau_i2c_chan *i2c = data;
 186         return !!(nv_rd32(i2c->dev, i2c->rd) & 0x10);
 187 }
 188
 189 static int
 190 nvd0_i2c_getsda(void *data)
 191 {
 192         struct nouveau_i2c_chan *i2c = data;
 193         return !!(nv_rd32(i2c->dev, i2c->rd) & 0x20);
 194 }
 195
 196 static void
 197 pscnv_iicbb_setsda(device_t idev, int val)
 198 {
 199         struct nouveau_i2c_chan *i2c = device_get_softc(idev);
 200         i2c->bit.setsda(i2c, val);
 201 }
 202
 203 static void
 204 pscnv_iicbb_setscl(device_t idev, int val)
 205 {
 206         struct nouveau_i2c_chan *i2c = device_get_softc(idev);
 207         i2c->bit.setscl(i2c, val);
 208 }
 209
 210 static int
 211 pscnv_iicbb_getsda(device_t idev)
 212 {
 213         struct nouveau_i2c_chan *i2c = device_get_softc(idev);
 214         return i2c->bit.getsda(i2c);
 215 }
 216
 217 static int
 218 pscnv_iicbb_getscl(device_t idev)
 219 {
 220         struct nouveau_i2c_chan *i2c = device_get_softc(idev);
 221         return i2c->bit.getscl(i2c);
 222 }
 223
 224
 225 static const uint32_t nv50_i2c_port[] = {
 226         0x00e138, 0x00e150, 0x00e168, 0x00e180,
 227         0x00e254, 0x00e274, 0x00e764, 0x00e780,
 228         0x00e79c, 0x00e7b8
 229 };
 230 #define NV50_I2C_PORTS DRM_ARRAY_SIZE(nv50_i2c_port)
 231
 232 int
 233 nouveau_i2c_init(struct drm_device *dev, struct dcb_i2c_entry *entry, int index)
 234 {
 235         struct drm_nouveau_private *dev_priv = dev->dev_private;
 236         struct nouveau_i2c_chan *i2c;
 237         int ret;
 238         device_t idev;
 239
 240         if (entry->chan)
 241                 return -EEXIST;
 242
 243         if (dev_priv->card_type >= NV_50 && entry->read >= NV50_I2C_PORTS) {
 244                 NV_ERROR(dev, "unknown i2c port %d\n", entry->read);
 245                 return -EINVAL;
 246         }
 247
 248         if (entry->port_type < 6) {
 249                 idev = device_add_child(dev->device, "pscnv_iicbb", index);
 250         } else {
 251                 idev = device_add_child(dev->device, "pscnv_gmbus", index);
 252         }
 253         if (!idev) {
 254                 return -ENODEV;
 255         }
 256         ret = device_probe_and_attach(idev);
 257         if (ret) {
 258                 NV_ERROR(dev, "Couldn't attach device: %d\n", ret);
 259                 device_delete_child(dev->device, idev);
 260                 return -ret;
 261         }
 262         device_quiet(idev);
 263         i2c = device_get_softc(idev);
 264         if (!i2c) {
 265                 NV_ERROR(dev, "Erp?!\n");
 266                 return -ENODEV;
 267         }
 268
 269         switch (entry->port_type) {
 270         case 0:
 271                 i2c->bit.setsda = nv04_i2c_setsda;
 272                 i2c->bit.setscl = nv04_i2c_setscl;
 273                 i2c->bit.getsda = nv04_i2c_getsda;
 274                 i2c->bit.getscl = nv04_i2c_getscl;
 275                 i2c->rd = entry->read;
 276                 i2c->wr = entry->write;
 277                 break;
 278         case 4:
 279                 i2c->bit.setsda = nv4e_i2c_setsda;
 280                 i2c->bit.setscl = nv4e_i2c_setscl;
 281                 i2c->bit.getsda = nv4e_i2c_getsda;
 282                 i2c->bit.getscl = nv4e_i2c_getscl;
 283                 i2c->rd = 0x600800 + entry->read;
 284                 i2c->wr = 0x600800 + entry->write;
 285                 break;
 286         case 5:
 287                 i2c->bit.setsda = nv50_i2c_setsda;
 288                 i2c->bit.setscl = nv50_i2c_setscl;
 289                 if (dev_priv->card_type < NV_D0) {
 290                         i2c->bit.getsda = nv50_i2c_getsda;
 291                         i2c->bit.getscl = nv50_i2c_getscl;
 292                         i2c->rd = nv50_i2c_port[entry->read];
 293                 } else {
 294                         i2c->bit.getsda = nvd0_i2c_getsda;
 295                         i2c->bit.getscl = nvd0_i2c_getscl;
 296                         i2c->rd = 0x00d014 + (entry->read * 0x20);
 297                 }
 298                 i2c->wr = i2c->rd;
 299                 break;
 300         case 6:
 301                 i2c->rd = entry->read;
 302                 i2c->wr = entry->write;
 303                 break;
 304         default:
 305                 NV_ERROR(dev, "DCB I2C port type %d unknown\n",
 306                          entry->port_type);
 307                 return -EINVAL;
 308         }
 309
 310         entry->chan = i2c;
 311         return 0;
 312 }
 313
 314 void
 315 nouveau_i2c_fini(struct drm_device *dev, struct dcb_i2c_entry *entry)
 316 {
 317         if (!entry->chan)
 318                 return;
 319
 320         device_delete_child(dev->device, entry->chan->adapter);
 321 }
 322
 323 struct nouveau_i2c_chan *
 324 nouveau_i2c_find(struct drm_device *dev, int index)
 325 {
 326         struct drm_nouveau_private *dev_priv = dev->dev_private;
 327         struct dcb_i2c_entry *i2c = &dev_priv->vbios.dcb.i2c[index];
 328
 329         if (index >= DCB_MAX_NUM_I2C_ENTRIES)
 330                 return NULL;
 331
 332         if (dev_priv->chipset >= NV_50 && (i2c->entry & 0x00000100)) {
 333                 uint32_t reg = 0xe500, val;
 334
 335                 if (i2c->port_type == 6) {
 336                         reg += i2c->read * 0x50;
 337                         val  = 0x2002;
 338                 } else {
 339                         reg += ((i2c->entry & 0x1e00) >> 9) * 0x50;
 340                         val  = 0xe001;
 341                 }
 342
 343                 nv_wr32(dev, reg, (nv_rd32(dev, reg) & ~0xf003) | val);
 344         }
 345
 346         if (!i2c->chan && nouveau_i2c_init(dev, i2c, index))
 347                 return NULL;
 348         return i2c->chan;
 349 }
 350
 351 bool
 352 nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
 353 {
 354         uint8_t buf[] = { 0 };
 355         struct i2c_msg msgs[] = {
 356                 {
 357                         .slave = addr,
 358                         .flags = 0,
 359                         .len = 1,
 360                         .buf = buf,
 361                 },
 362                 {
 363                         .slave = addr,
 364                         .flags = IIC_M_RD,
 365                         .len = 1,
 366                         .buf = buf,
 367                 }
 368         };
 369
 370         return !iicbus_transfer(i2c->bus, msgs, 2);
 371 }
 372
 373 int
 374 nouveau_i2c_identify(struct drm_device *dev, const char *what,
 375                      struct i2c_board_info *info,
 376                      bool (*match)(struct nouveau_i2c_chan *,
 377                                    struct i2c_board_info *),
 378                      int index)
 379 {
 380         struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
 381         int i;
 382
 383         NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index);
 384
 385         for (i = 0; info[i].addr; i++) {
 386                 if (nouveau_probe_i2c_addr(i2c, info[i].addr) &&
 387                     (!match || match(i2c, &info[i]))) {
 388                         NV_INFO(dev, "Detected %s on %i\n", what, index);
 389                         return i;
 390                 }
 391         }
 392
 393         NV_DEBUG(dev, "No devices found.\n");
 394         return -ENODEV;
 395 }
 396
 397 static int
 398 pscnv_gmbus_attach(device_t idev)
 399 {
 400         struct drm_nouveau_private *dev_priv;
 401         struct nouveau_i2c_chan *sc;
 402         int pin;
 403
 404         sc = device_get_softc(idev);
 405         sc->dev = device_get_softc(device_get_parent(idev));
 406         dev_priv = sc->dev->dev_private;
 407         pin = device_get_unit(idev);
 408
 409         snprintf(sc->name, sizeof(sc->name), "pscnv_iicbb %u", pin);
 410         device_set_desc(idev, sc->name);
 411
 412         /* add bus interface device */
 413         sc->bus = sc->iic_dev = device_add_child(idev, "iicbus", -1);
 414         if (sc->iic_dev == NULL) {
 415                 NV_ERROR(sc->dev, "Could not add iicbus to gmbus!\n");
 416                 return (ENXIO);
 417         }
 418         device_quiet(sc->iic_dev);
 419         bus_generic_attach(idev);
 420
 421         return (0);
 422 }
 423
 424 static int
 425 pscnv_iicbb_attach(device_t idev)
 426 {
 427         struct drm_nouveau_private *dev_priv;
 428         struct nouveau_i2c_chan *sc;
 429         int pin;
 430
 431         sc = device_get_softc(idev);
 432         sc->dev = device_get_softc(device_get_parent(idev));
 433         dev_priv = sc->dev->dev_private;
 434         pin = device_get_unit(idev);
 435
 436         snprintf(sc->name, sizeof(sc->name), "pscnv_iicbb %u", pin);
 437         device_set_desc(idev, sc->name);
 438
 439         /* add bus interface device */
 440         sc->iic_dev = device_add_child(idev, "iicbb", -1);
 441         if (sc->iic_dev == NULL) {
 442                 NV_ERROR(sc->dev, "Could not add iicbb to our bitbanger!\n");
 443                 return (ENXIO);
 444         }
 445         device_quiet(sc->iic_dev);
 446         bus_generic_attach(idev);
 447         sc->bus = device_find_child(sc->iic_dev, "iicbus", -1);
 448
 449         return (0);
 450 }
 451
 452 static int
 453 pscnv_gmbus_transfer(device_t idev, struct iic_msg *msgs, uint32_t nmsgs)
 454 {
 455         struct drm_nouveau_private *dev_priv;
 456         struct nouveau_i2c_chan *auxch;
 457         struct i2c_msg *msg = msgs;
 458         int ret, mcnt = nmsgs;
 459
 460         auxch = device_get_softc(idev);
 461         dev_priv = auxch->dev->dev_private;
 462
 463         while (mcnt--) {
 464                 u8 remaining = msg->len;
 465                 u8 *ptr = msg->buf;
 466
 467                 while (remaining) {
 468                         u8 cnt = (remaining > 16) ? 16 : remaining;
 469                         u8 cmd;
 470
 471                         if (msg->flags & I2C_M_RD)
 472                                 cmd = AUX_I2C_READ;
 473                         else
 474                                 cmd = AUX_I2C_WRITE;
 475
 476                         if (mcnt || remaining > 16)
 477                                 cmd |= AUX_I2C_MOT;
 478
 479                         ret = nouveau_dp_auxch(auxch, cmd, msg->slave, ptr, cnt);
 480                         if (ret < 0)
 481                                 return (-ret);
 482
 483                         switch (ret & NV50_AUXCH_STAT_REPLY_I2C) {
 484                         case NV50_AUXCH_STAT_REPLY_I2C_ACK:
 485                                 break;
 486                         case NV50_AUXCH_STAT_REPLY_I2C_NACK:
 487                                 return (EREMOTEIO);
 488                         case NV50_AUXCH_STAT_REPLY_I2C_DEFER:
 489                                 udelay(100);
 490                                 continue;
 491                         default:
 492                                 NV_ERROR(auxch->dev, "bad auxch reply: 0x%08x\n", ret);
 493                                 return (EREMOTEIO);
 494                         }
 495
 496                         ptr += cnt;
 497                         remaining -= cnt;
 498                 }
 499
 500                 msg++;
 501         }
 502
 503         return (0);
 504 }
 505
 506 static int
 507 pscnv_iic_probe(device_t dev)
 508 {
 509         return (BUS_PROBE_SPECIFIC);
 510 }
 511
 512 static int
 513 pscnv_iic_detach(device_t idev)
 514 {
 515         struct nouveau_i2c_chan *sc;
 516         device_t child;
 517
 518         sc = device_get_softc(idev);
 519         child = sc->iic_dev;
 520         bus_generic_detach(idev);
 521         if (child)
 522                 device_delete_child(idev, child);
 523         return (0);
 524 }
 525
 526 static int
 527 pscnv_iicbus_reset(device_t idev, u_char speed, u_char addr, u_char *oldaddr)
 528 {
 529         return (0);
 530 }
 531
 532 /* DP transfer with auxch */
 533 static device_method_t pscnv_gmbus_methods[] = {
 534         DEVMETHOD(device_probe,         pscnv_iic_probe),
 535         DEVMETHOD(device_attach,        pscnv_gmbus_attach),
 536         DEVMETHOD(device_detach,        pscnv_iic_detach),
 537         DEVMETHOD(iicbus_reset,         pscnv_iicbus_reset),
 538         DEVMETHOD(iicbus_transfer,      pscnv_gmbus_transfer),
 539         DEVMETHOD_END
 540 };
 541 static driver_t pscnv_gmbus_driver = {
 542         "pscnv_gmbus",
 543         pscnv_gmbus_methods,
 544         sizeof(struct nouveau_i2c_chan)
 545 };
 546 static devclass_t pscnv_gmbus_devclass;
 547 DRIVER_MODULE_ORDERED(pscnv_gmbus, drm, pscnv_gmbus_driver,
 548     pscnv_gmbus_devclass, 0, 0, SI_ORDER_FIRST);
 549 DRIVER_MODULE(iicbus, pscnv_gmbus, iicbus_driver, iicbus_devclass, 0, 0);
 550
 551 /* Bit banging */
 552 static device_method_t pscnv_iicbb_methods[] =  {
 553         DEVMETHOD(device_probe,         pscnv_iic_probe),
 554         DEVMETHOD(device_attach,        pscnv_iicbb_attach),
 555         DEVMETHOD(device_detach,        pscnv_iic_detach),
 556
 557         DEVMETHOD(bus_add_child,        bus_generic_add_child),
 558         DEVMETHOD(bus_print_child,      bus_generic_print_child),
 559
 560         DEVMETHOD(iicbb_callback,       iicbus_null_callback),
 561         DEVMETHOD(iicbus_reset,         pscnv_iicbus_reset),
 562         DEVMETHOD(iicbb_setsda,         pscnv_iicbb_setsda),
 563         DEVMETHOD(iicbb_setscl,         pscnv_iicbb_setscl),
 564         DEVMETHOD(iicbb_getsda,         pscnv_iicbb_getsda),
 565         DEVMETHOD(iicbb_getscl,         pscnv_iicbb_getscl),
 566         DEVMETHOD_END
 567 };
 568 static driver_t pscnv_iicbb_driver = {
 569         "pscnv_iicbb",
 570         pscnv_iicbb_methods,
 571         sizeof(struct nouveau_i2c_chan)
 572 };
 573 static devclass_t pscnv_iicbb_devclass;
 574 DRIVER_MODULE_ORDERED(pscnv_iicbb, drm, pscnv_iicbb_driver,
 575     pscnv_iicbb_devclass, 0, 0, SI_ORDER_FIRST);
 576 DRIVER_MODULE(iicbb, pscnv_iicbb, iicbb_driver, iicbb_devclass, 0, 0);