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 "aux.h"
  26 #include "bus.h"
  27 #include "pad.h"
  28
  29 #include <core/notify.h>
  30 #include <core/option.h>
  31 #include <subdev/bios.h>
  32 #include <subdev/bios/dcb.h>
  33 #include <subdev/bios/i2c.h>
  34
  35 static struct nvkm_i2c_pad *
  36 nvkm_i2c_pad_find(struct nvkm_i2c *i2c, int id)
  37 {
  38         struct nvkm_i2c_pad *pad;
  39
  40         list_for_each_entry(pad, &i2c->pad, head) {
  41                 if (pad->id == id)
  42                         return pad;
  43         }
  44
  45         return NULL;
  46 }
  47
  48 struct nvkm_i2c_bus *
  49 nvkm_i2c_bus_find(struct nvkm_i2c *i2c, int id)
  50 {
  51         struct nvkm_bios *bios = i2c->subdev.device->bios;
  52         struct nvkm_i2c_bus *bus;
  53
  54         if (id == NVKM_I2C_BUS_PRI || id == NVKM_I2C_BUS_SEC) {
  55                 u8  ver, hdr, cnt, len;
  56                 u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
  57                 if (i2c && ver >= 0x30) {
  58                         u8 auxidx = nvbios_rd08(bios, i2c + 4);
  59                         if (id == NVKM_I2C_BUS_PRI)
  60                                 id = NVKM_I2C_BUS_CCB((auxidx & 0x0f) >> 0);
  61                         else
  62                                 id = NVKM_I2C_BUS_CCB((auxidx & 0xf0) >> 4);
  63                 } else {
  64                         id = NVKM_I2C_BUS_CCB(2);
  65                 }
  66         }
  67
  68         list_for_each_entry(bus, &i2c->bus, head) {
  69                 if (bus->id == id)
  70                         return bus;
  71         }
  72
  73         return NULL;
  74 }
  75
  76 struct nvkm_i2c_aux *
  77 nvkm_i2c_aux_find(struct nvkm_i2c *i2c, int id)
  78 {
  79         struct nvkm_i2c_aux *aux;
  80
  81         list_for_each_entry(aux, &i2c->aux, head) {
  82                 if (aux->id == id)
  83                         return aux;
  84         }
  85
  86         return NULL;
  87 }
  88
  89 static void
  90 nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int id)
  91 {
  92         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
  93         struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
  94         if (aux)
  95                 i2c->func->aux_mask(i2c, type, aux->intr, 0);
  96 }
  97
  98 static void
  99 nvkm_i2c_intr_init(struct nvkm_event *event, int type, int id)
 100 {
 101         struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
 102         struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
 103         if (aux)
 104                 i2c->func->aux_mask(i2c, type, aux->intr, aux->intr);
 105 }
 106
 107 static int
 108 nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size,
 109                    struct nvkm_notify *notify)
 110 {
 111         struct nvkm_i2c_ntfy_req *req = data;
 112         if (!WARN_ON(size != sizeof(*req))) {
 113                 notify->size  = sizeof(struct nvkm_i2c_ntfy_rep);
 114                 notify->types = req->mask;
 115                 notify->index = req->port;
 116                 return 0;
 117         }
 118         return -EINVAL;
 119 }
 120
 121 static const struct nvkm_event_func
 122 nvkm_i2c_intr_func = {
 123         .ctor = nvkm_i2c_intr_ctor,
 124         .init = nvkm_i2c_intr_init,
 125         .fini = nvkm_i2c_intr_fini,
 126 };
 127
 128 static void
 129 nvkm_i2c_intr(struct nvkm_subdev *subdev)
 130 {
 131         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 132         struct nvkm_i2c_aux *aux;
 133         u32 hi, lo, rq, tx;
 134
 135         if (!i2c->func->aux_stat)
 136                 return;
 137
 138         i2c->func->aux_stat(i2c, &hi, &lo, &rq, &tx);
 139         if (!hi && !lo && !rq && !tx)
 140                 return;
 141
 142         list_for_each_entry(aux, &i2c->aux, head) {
 143                 u32 mask = 0;
 144                 if (hi & aux->intr) mask |= NVKM_I2C_PLUG;
 145                 if (lo & aux->intr) mask |= NVKM_I2C_UNPLUG;
 146                 if (rq & aux->intr) mask |= NVKM_I2C_IRQ;
 147                 if (tx & aux->intr) mask |= NVKM_I2C_DONE;
 148                 if (mask) {
 149                         struct nvkm_i2c_ntfy_rep rep = {
 150                                 .mask = mask,
 151                         };
 152                         nvkm_event_send(&i2c->event, rep.mask, aux->id,
 153                                         &rep, sizeof(rep));
 154                 }
 155         }
 156 }
 157
 158 static int
 159 nvkm_i2c_fini(struct nvkm_subdev *subdev, bool suspend)
 160 {
 161         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 162         struct nvkm_i2c_pad *pad;
 163         u32 mask;
 164
 165         if ((mask = (1 << i2c->func->aux) - 1), i2c->func->aux_stat) {
 166                 i2c->func->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
 167                 i2c->func->aux_stat(i2c, &mask, &mask, &mask, &mask);
 168         }
 169
 170         list_for_each_entry(pad, &i2c->pad, head) {
 171                 nvkm_i2c_pad_fini(pad);
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int
 178 nvkm_i2c_init(struct nvkm_subdev *subdev)
 179 {
 180         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 181         struct nvkm_i2c_bus *bus;
 182         struct nvkm_i2c_pad *pad;
 183
 184         list_for_each_entry(pad, &i2c->pad, head) {
 185                 nvkm_i2c_pad_init(pad);
 186         }
 187
 188         list_for_each_entry(bus, &i2c->bus, head) {
 189                 nvkm_i2c_bus_init(bus);
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void *
 196 nvkm_i2c_dtor(struct nvkm_subdev *subdev)
 197 {
 198         struct nvkm_i2c *i2c = nvkm_i2c(subdev);
 199
 200         nvkm_event_fini(&i2c->event);
 201
 202         while (!list_empty(&i2c->aux)) {
 203                 struct nvkm_i2c_aux *aux =
 204                         list_first_entry(&i2c->aux, typeof(*aux), head);
 205                 nvkm_i2c_aux_del(&aux);
 206         }
 207
 208         while (!list_empty(&i2c->bus)) {
 209                 struct nvkm_i2c_bus *bus =
 210                         list_first_entry(&i2c->bus, typeof(*bus), head);
 211                 nvkm_i2c_bus_del(&bus);
 212         }
 213
 214         while (!list_empty(&i2c->pad)) {
 215                 struct nvkm_i2c_pad *pad =
 216                         list_first_entry(&i2c->pad, typeof(*pad), head);
 217                 nvkm_i2c_pad_del(&pad);
 218         }
 219
 220         return i2c;
 221 }
 222
 223 static const struct nvkm_subdev_func
 224 nvkm_i2c = {
 225         .dtor = nvkm_i2c_dtor,
 226         .init = nvkm_i2c_init,
 227         .fini = nvkm_i2c_fini,
 228         .intr = nvkm_i2c_intr,
 229 };
 230
 231 static const struct nvkm_i2c_drv {
 232         u8 bios;
 233         u8 addr;
 234         int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
 235                        struct nvkm_i2c_pad **);
 236 }
 237 nvkm_i2c_drv[] = {
 238         { 0x0d, 0x39, anx9805_pad_new },
 239         { 0x0e, 0x3b, anx9805_pad_new },
 240         {}
 241 };
 242
 243 int
 244 nvkm_i2c_new_(const struct nvkm_i2c_func *func, struct nvkm_device *device,
 245               int index, struct nvkm_i2c **pi2c)
 246 {
 247         struct nvkm_bios *bios = device->bios;
 248         struct nvkm_i2c *i2c;
 249         struct dcb_i2c_entry ccbE;
 250         struct dcb_output dcbE;
 251         u8 ver, hdr;
 252         int ret, i;
 253
 254         if (!(i2c = *pi2c = kzalloc(sizeof(*i2c), GFP_KERNEL)))
 255                 return -ENOMEM;
 256
 257         nvkm_subdev_ctor(&nvkm_i2c, device, index, 0, &i2c->subdev);
 258         i2c->func = func;
 259         INIT_LIST_HEAD(&i2c->pad);
 260         INIT_LIST_HEAD(&i2c->bus);
 261         INIT_LIST_HEAD(&i2c->aux);
 262
 263         i = -1;
 264         while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
 265                 struct nvkm_i2c_pad *pad = NULL;
 266                 struct nvkm_i2c_bus *bus = NULL;
 267                 struct nvkm_i2c_aux *aux = NULL;
 268
 269                 nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
 270                            "sense %02x share %02x auxch %02x\n", i, ccbE.type,
 271                            ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
 272
 273                 if (ccbE.share != DCB_I2C_UNUSED) {
 274                         const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
 275                         if (!(pad = nvkm_i2c_pad_find(i2c, id)))
 276                                 ret = func->pad_s_new(i2c, id, &pad);
 277                         else
 278                                 ret = 0;
 279                 } else {
 280                         ret = func->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
 281                 }
 282
 283                 if (ret) {
 284                         nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
 285                         nvkm_i2c_pad_del(&pad);
 286                         continue;
 287                 }
 288
 289                 if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
 290                         ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
 291                                                    ccbE.drive,
 292                                                    ccbE.sense, &bus);
 293                 } else
 294                 if (pad->func->bus_new_4 &&
 295                     ( ccbE.type == DCB_I2C_NV4E_BIT ||
 296                       ccbE.type == DCB_I2C_NVIO_BIT ||
 297                      (ccbE.type == DCB_I2C_PMGR &&
 298                       ccbE.drive != DCB_I2C_UNUSED))) {
 299                         ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
 300                                                    ccbE.drive, &bus);
 301                 }
 302
 303                 if (ret) {
 304                         nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
 305                         nvkm_i2c_bus_del(&bus);
 306                 }
 307
 308                 if (pad->func->aux_new_6 &&
 309                     ( ccbE.type == DCB_I2C_NVIO_AUX ||
 310                      (ccbE.type == DCB_I2C_PMGR &&
 311                       ccbE.auxch != DCB_I2C_UNUSED))) {
 312                         ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
 313                                                    ccbE.auxch, &aux);
 314                 } else {
 315                         ret = 0;
 316                 }
 317
 318                 if (ret) {
 319                         nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
 320                         nvkm_i2c_aux_del(&aux);
 321                 }
 322
 323                 if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
 324                         nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
 325                         continue;
 326                 }
 327         }
 328
 329         i = -1;
 330         while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
 331                 const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
 332                 struct nvkm_i2c_bus *bus;
 333                 struct nvkm_i2c_pad *pad;
 334
 335                 /* internal outputs handled by native i2c busses (above) */
 336                 if (!dcbE.location)
 337                         continue;
 338
 339                 /* we need an i2c bus to talk to the external encoder */
 340                 bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
 341                 if (!bus) {
 342                         nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
 343                         continue;
 344                 }
 345
 346                 /* ... and a driver for it */
 347                 while (drv->pad_new) {
 348                         if (drv->bios == dcbE.extdev)
 349                                 break;
 350                         drv++;
 351                 }
 352
 353                 if (!drv->pad_new) {
 354                         nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
 355                                    i, dcbE.extdev);
 356                         continue;
 357                 }
 358
 359                 /* find/create an instance of the driver */
 360                 pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
 361                 if (!pad) {
 362                         const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
 363                         ret = drv->pad_new(bus, id, drv->addr, &pad);
 364                         if (ret) {
 365                                 nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
 366                                            i, ret);
 367                                 nvkm_i2c_pad_del(&pad);
 368                                 continue;
 369                         }
 370                 }
 371
 372                 /* create any i2c bus / aux channel required by the output */
 373                 if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
 374                         const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
 375                         struct nvkm_i2c_aux *aux = NULL;
 376                         ret = pad->func->aux_new_6(pad, id, 0, &aux);
 377                         if (ret) {
 378                                 nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
 379                                            i, ret);
 380                                 nvkm_i2c_aux_del(&aux);
 381                         }
 382                 } else
 383                 if (pad->func->bus_new_4) {
 384                         const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
 385                         struct nvkm_i2c_bus *bus = NULL;
 386                         ret = pad->func->bus_new_4(pad, id, 0, &bus);
 387                         if (ret) {
 388                                 nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
 389                                            i, ret);
 390                                 nvkm_i2c_bus_del(&bus);
 391                         }
 392                 }
 393         }
 394
 395         return nvkm_event_init(&nvkm_i2c_intr_func, 4, i, &i2c->event);
 396 }