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 "aux.h"
  26 #include "bus.h"
  27 #include "pad.h"
  28
  29 #include <core/option.h>
  30 #include <subdev/bios.h>
  31 #include <subdev/bios/dcb.h>
  32 #include <subdev/bios/i2c.h>
  33
  34 static struct nvkm_i2c_pad *
  35 nvkm_i2c_pad_find(struct nvkm_i2c *i2c, int id)
  36 {
  37         struct nvkm_i2c_pad *pad;
  38
  39         list_for_each_entry(pad, &i2c->pad, head) {
  40                 if (pad->id == id)
  41                         return pad;
  42         }
  43
  44         return NULL;
  45 }
  46
  47 struct nvkm_i2c_bus *
  48 nvkm_i2c_bus_find(struct nvkm_i2c *i2c, int id)
  49 {
  50         struct nvkm_bios *bios = i2c->subdev.device->bios;
  51         struct nvkm_i2c_bus *bus;
  52
  53         if (id == NVKM_I2C_BUS_PRI || id == NVKM_I2C_BUS_SEC) {
  54                 u8  ver, hdr, cnt, len;
  55                 u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
  56                 if (i2c && ver >= 0x30) {
  57                         u8 auxidx = nvbios_rd08(bios, i2c + 4);
  58                         if (id == NVKM_I2C_BUS_PRI)
  59                                 id = NVKM_I2C_BUS_CCB((auxidx & 0x0f) >> 0);
  60                         else
  61                                 id = NVKM_I2C_BUS_CCB((auxidx & 0xf0) >> 4);
  62                 } else {
  63                         id = NVKM_I2C_BUS_CCB(2);
  64                 }
  65         }
  66
  67         list_for_each_entry(bus, &i2c->bus, head) {
  68                 if (bus->id == id)
  69                         return bus;
  70         }
  71
  72         return NULL;
  73 }
  74
  75 struct nvkm_i2c_aux *
  76 nvkm_i2c_aux_find(struct nvkm_i2c *i2c, int id)
  77 {
  78         struct nvkm_i2c_aux *aux;
  79
  80         list_for_each_entry(aux, &i2c->aux, head) {
  81                 if (aux->id == id)
  82                         return aux;
  83         }
  84
  85         return NULL;
  86 }
  87
  88 static void
  89 nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int id)
  90 {
  91         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
  92         struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
  93         if (aux)
  94                 i2c->func->aux_mask(i2c, type, aux->intr, 0);
  95 }
  96
  97 static void
  98 nvkm_i2c_intr_init(struct nvkm_event *event, int type, int id)
  99 {
 100         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
 101         struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
 102         if (aux)
 103                 i2c->func->aux_mask(i2c, type, aux->intr, aux->intr);
 104 }
 105
 106 static const struct nvkm_event_func
 107 nvkm_i2c_intr_func = {
 108         .init = nvkm_i2c_intr_init,
 109         .fini = nvkm_i2c_intr_fini,
 110 };
 111
 112 static void
 113 nvkm_i2c_intr(struct nvkm_subdev *subdev)
 114 {
 115         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 116         struct nvkm_i2c_aux *aux;
 117         u32 hi, lo, rq, tx;
 118
 119         if (!i2c->func->aux_stat)
 120                 return;
 121
 122         i2c->func->aux_stat(i2c, &hi, &lo, &rq, &tx);
 123         if (!hi && !lo && !rq && !tx)
 124                 return;
 125
 126         list_for_each_entry(aux, &i2c->aux, head) {
 127                 u32 mask = 0;
 128                 if (hi & aux->intr) mask |= NVKM_I2C_PLUG;
 129                 if (lo & aux->intr) mask |= NVKM_I2C_UNPLUG;
 130                 if (rq & aux->intr) mask |= NVKM_I2C_IRQ;
 131                 if (tx & aux->intr) mask |= NVKM_I2C_DONE;
 132                 if (mask)
 133                         nvkm_event_ntfy(&i2c->event, aux->id, mask);
 134         }
 135 }
 136
 137 static int
 138 nvkm_i2c_fini(struct nvkm_subdev *subdev, bool suspend)
 139 {
 140         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 141         struct nvkm_i2c_pad *pad;
 142         struct nvkm_i2c_bus *bus;
 143         struct nvkm_i2c_aux *aux;
 144         u32 mask;
 145
 146         list_for_each_entry(aux, &i2c->aux, head) {
 147                 nvkm_i2c_aux_fini(aux);
 148         }
 149
 150         list_for_each_entry(bus, &i2c->bus, head) {
 151                 nvkm_i2c_bus_fini(bus);
 152         }
 153
 154         if ((mask = (1 << i2c->func->aux) - 1), i2c->func->aux_stat) {
 155                 i2c->func->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
 156                 i2c->func->aux_stat(i2c, &mask, &mask, &mask, &mask);
 157         }
 158
 159         list_for_each_entry(pad, &i2c->pad, head) {
 160                 nvkm_i2c_pad_fini(pad);
 161         }
 162
 163         return 0;
 164 }
 165
 166 static int
 167 nvkm_i2c_preinit(struct nvkm_subdev *subdev)
 168 {
 169         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 170         struct nvkm_i2c_bus *bus;
 171         struct nvkm_i2c_pad *pad;
 172
 173         /*
 174          * We init our i2c busses as early as possible, since they may be
 175          * needed by the vbios init scripts on some cards
 176          */
 177         list_for_each_entry(pad, &i2c->pad, head)
 178                 nvkm_i2c_pad_init(pad);
 179         list_for_each_entry(bus, &i2c->bus, head)
 180                 nvkm_i2c_bus_init(bus);
 181
 182         return 0;
 183 }
 184
 185 static int
 186 nvkm_i2c_init(struct nvkm_subdev *subdev)
 187 {
 188         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 189         struct nvkm_i2c_bus *bus;
 190         struct nvkm_i2c_pad *pad;
 191         struct nvkm_i2c_aux *aux;
 192
 193         list_for_each_entry(pad, &i2c->pad, head) {
 194                 nvkm_i2c_pad_init(pad);
 195         }
 196
 197         list_for_each_entry(bus, &i2c->bus, head) {
 198                 nvkm_i2c_bus_init(bus);
 199         }
 200
 201         list_for_each_entry(aux, &i2c->aux, head) {
 202                 nvkm_i2c_aux_init(aux);
 203         }
 204
 205         return 0;
 206 }
 207
 208 static void *
 209 nvkm_i2c_dtor(struct nvkm_subdev *subdev)
 210 {
 211         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 212
 213         nvkm_event_fini(&i2c->event);
 214
 215         while (!list_empty(&i2c->aux)) {
 216                 struct nvkm_i2c_aux *aux =
 217                         list_first_entry(&i2c->aux, typeof(*aux), head);
 218                 nvkm_i2c_aux_del(&aux);
 219         }
 220
 221         while (!list_empty(&i2c->bus)) {
 222                 struct nvkm_i2c_bus *bus =
 223                         list_first_entry(&i2c->bus, typeof(*bus), head);
 224                 nvkm_i2c_bus_del(&bus);
 225         }
 226
 227         while (!list_empty(&i2c->pad)) {
 228                 struct nvkm_i2c_pad *pad =
 229                         list_first_entry(&i2c->pad, typeof(*pad), head);
 230                 nvkm_i2c_pad_del(&pad);
 231         }
 232
 233         return i2c;
 234 }
 235
 236 static const struct nvkm_subdev_func
 237 nvkm_i2c = {
 238         .dtor = nvkm_i2c_dtor,
 239         .preinit = nvkm_i2c_preinit,
 240         .init = nvkm_i2c_init,
 241         .fini = nvkm_i2c_fini,
 242         .intr = nvkm_i2c_intr,
 243 };
 244
 245 static const struct nvkm_i2c_drv {
 246         u8 bios;
 247         u8 addr;
 248         int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
 249                        struct nvkm_i2c_pad **);
 250 }
 251 nvkm_i2c_drv[] = {
 252         { 0x0d, 0x39, anx9805_pad_new },
 253         { 0x0e, 0x3b, anx9805_pad_new },
 254         {}
 255 };
 256
 257 int
 258 nvkm_i2c_new_(const struct nvkm_i2c_func *func, struct nvkm_device *device,
 259               enum nvkm_subdev_type type, int inst, struct nvkm_i2c **pi2c)
 260 {
 261         struct nvkm_bios *bios = device->bios;
 262         struct nvkm_i2c *i2c;
 263         struct dcb_i2c_entry ccbE;
 264         struct dcb_output dcbE;
 265         u8 ver, hdr;
 266         int ret, i;
 267
 268         if (!(i2c = *pi2c = kzalloc(sizeof(*i2c), GFP_KERNEL)))
 269                 return -ENOMEM;
 270
 271         nvkm_subdev_ctor(&nvkm_i2c, device, type, inst, &i2c->subdev);
 272         i2c->func = func;
 273         INIT_LIST_HEAD(&i2c->pad);
 274         INIT_LIST_HEAD(&i2c->bus);
 275         INIT_LIST_HEAD(&i2c->aux);
 276
 277         i = -1;
 278         while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
 279                 struct nvkm_i2c_pad *pad = NULL;
 280                 struct nvkm_i2c_bus *bus = NULL;
 281                 struct nvkm_i2c_aux *aux = NULL;
 282
 283                 nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
 284                            "sense %02x share %02x auxch %02x\n", i, ccbE.type,
 285                            ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
 286
 287                 if (ccbE.share != DCB_I2C_UNUSED) {
 288                         const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
 289                         if (!(pad = nvkm_i2c_pad_find(i2c, id)))
 290                                 ret = func->pad_s_new(i2c, id, &pad);
 291                         else
 292                                 ret = 0;
 293                 } else {
 294                         ret = func->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
 295                 }
 296
 297                 if (ret) {
 298                         nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
 299                         nvkm_i2c_pad_del(&pad);
 300                         continue;
 301                 }
 302
 303                 if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
 304                         ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
 305                                                    ccbE.drive,
 306                                                    ccbE.sense, &bus);
 307                 } else
 308                 if (pad->func->bus_new_4 &&
 309                     ( ccbE.type == DCB_I2C_NV4E_BIT ||
 310                       ccbE.type == DCB_I2C_NVIO_BIT ||
 311                      (ccbE.type == DCB_I2C_PMGR &&
 312                       ccbE.drive != DCB_I2C_UNUSED))) {
 313                         ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
 314                                                    ccbE.drive, &bus);
 315                 }
 316
 317                 if (ret) {
 318                         nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
 319                         nvkm_i2c_bus_del(&bus);
 320                 }
 321
 322                 if (pad->func->aux_new_6 &&
 323                     ( ccbE.type == DCB_I2C_NVIO_AUX ||
 324                      (ccbE.type == DCB_I2C_PMGR &&
 325                       ccbE.auxch != DCB_I2C_UNUSED))) {
 326                         ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
 327                                                    ccbE.auxch, &aux);
 328                 } else {
 329                         ret = 0;
 330                 }
 331
 332                 if (ret) {
 333                         nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
 334                         nvkm_i2c_aux_del(&aux);
 335                 }
 336
 337                 if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
 338                         nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
 339                         continue;
 340                 }
 341         }
 342
 343         i = -1;
 344         while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
 345                 const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
 346                 struct nvkm_i2c_bus *bus;
 347                 struct nvkm_i2c_pad *pad;
 348
 349                 /* internal outputs handled by native i2c busses (above) */
 350                 if (!dcbE.location)
 351                         continue;
 352
 353                 /* we need an i2c bus to talk to the external encoder */
 354                 bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
 355                 if (!bus) {
 356                         nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
 357                         continue;
 358                 }
 359
 360                 /* ... and a driver for it */
 361                 while (drv->pad_new) {
 362                         if (drv->bios == dcbE.extdev)
 363                                 break;
 364                         drv++;
 365                 }
 366
 367                 if (!drv->pad_new) {
 368                         nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
 369                                    i, dcbE.extdev);
 370                         continue;
 371                 }
 372
 373                 /* find/create an instance of the driver */
 374                 pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
 375                 if (!pad) {
 376                         const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
 377                         ret = drv->pad_new(bus, id, drv->addr, &pad);
 378                         if (ret) {
 379                                 nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
 380                                            i, ret);
 381                                 nvkm_i2c_pad_del(&pad);
 382                                 continue;
 383                         }
 384                 }
 385
 386                 /* create any i2c bus / aux channel required by the output */
 387                 if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
 388                         const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
 389                         struct nvkm_i2c_aux *aux = NULL;
 390                         ret = pad->func->aux_new_6(pad, id, 0, &aux);
 391                         if (ret) {
 392                                 nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
 393                                            i, ret);
 394                                 nvkm_i2c_aux_del(&aux);
 395                         }
 396                 } else
 397                 if (pad->func->bus_new_4) {
 398                         const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
 399                         struct nvkm_i2c_bus *bus = NULL;
 400                         ret = pad->func->bus_new_4(pad, id, 0, &bus);
 401                         if (ret) {
 402                                 nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
 403                                            i, ret);
 404                                 nvkm_i2c_bus_del(&bus);
 405                         }
 406                 }
 407         }
 408
 409         return nvkm_event_init(&nvkm_i2c_intr_func, &i2c->subdev, 4, i, &i2c->event);
 410 }