drivers/media/platform/sti/delta/delta-ipc.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2015
   3  * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <linux/rpmsg.h>
   8
   9 #include "delta.h"
  10 #include "delta-ipc.h"
  11 #include "delta-mem.h"
  12
  13 #define IPC_TIMEOUT 100
  14 #define IPC_SANITY_TAG 0xDEADBEEF
  15
  16 enum delta_ipc_fw_command {
  17         DELTA_IPC_OPEN,
  18         DELTA_IPC_SET_STREAM,
  19         DELTA_IPC_DECODE,
  20         DELTA_IPC_CLOSE
  21 };
  22
  23 #define to_rpmsg_driver(__drv) container_of(__drv, struct rpmsg_driver, drv)
  24 #define to_delta(__d) container_of(__d, struct delta_dev, rpmsg_driver)
  25
  26 #define to_ctx(hdl) ((struct delta_ipc_ctx *)hdl)
  27 #define to_pctx(ctx) container_of(ctx, struct delta_ctx, ipc_ctx)
  28
  29 struct delta_ipc_header_msg {
  30         u32 tag;
  31         void *host_hdl;
  32         u32 copro_hdl;
  33         u32 command;
  34 };
  35
  36 #define to_host_hdl(ctx) ((void *)ctx)
  37
  38 #define msg_to_ctx(msg) ((struct delta_ipc_ctx *)(msg)->header.host_hdl)
  39 #define msg_to_copro_hdl(msg) ((msg)->header.copro_hdl)
  40
  41 static inline dma_addr_t to_paddr(struct delta_ipc_ctx *ctx, void *vaddr)
  42 {
  43         return (ctx->ipc_buf->paddr + (vaddr - ctx->ipc_buf->vaddr));
  44 }
  45
  46 static inline bool is_valid_data(struct delta_ipc_ctx *ctx,
  47                                  void *data, u32 size)
  48 {
  49         return ((data >= ctx->ipc_buf->vaddr) &&
  50                 ((data + size) <= (ctx->ipc_buf->vaddr + ctx->ipc_buf->size)));
  51 }
  52
  53 /*
  54  * IPC shared memory (@ipc_buf_size, @ipc_buf_paddr) is sent to copro
  55  * at each instance opening. This memory is allocated by IPC client
  56  * and given through delta_ipc_open(). All messages parameters
  57  * (open, set_stream, decode) will have their phy address within
  58  * this IPC shared memory, avoiding de-facto recopies inside delta-ipc.
  59  * All the below messages structures are used on both host and firmware
  60  * side and are packed (use only of 32 bits size fields in messages
  61  * structures to ensure packing):
  62  * - struct delta_ipc_open_msg
  63  * - struct delta_ipc_set_stream_msg
  64  * - struct delta_ipc_decode_msg
  65  * - struct delta_ipc_close_msg
  66  * - struct delta_ipc_cb_msg
  67  */
  68 struct delta_ipc_open_msg {
  69         struct delta_ipc_header_msg header;
  70         u32 ipc_buf_size;
  71         dma_addr_t ipc_buf_paddr;
  72         char name[32];
  73         u32 param_size;
  74         dma_addr_t param_paddr;
  75 };
  76
  77 struct delta_ipc_set_stream_msg {
  78         struct delta_ipc_header_msg header;
  79         u32 param_size;
  80         dma_addr_t param_paddr;
  81 };
  82
  83 struct delta_ipc_decode_msg {
  84         struct delta_ipc_header_msg header;
  85         u32 param_size;
  86         dma_addr_t param_paddr;
  87         u32 status_size;
  88         dma_addr_t status_paddr;
  89 };
  90
  91 struct delta_ipc_close_msg {
  92         struct delta_ipc_header_msg header;
  93 };
  94
  95 struct delta_ipc_cb_msg {
  96         struct delta_ipc_header_msg header;
  97         int err;
  98 };
  99
 100 static void build_msg_header(struct delta_ipc_ctx *ctx,
 101                              enum delta_ipc_fw_command command,
 102                              struct delta_ipc_header_msg *header)
 103 {
 104         header->tag = IPC_SANITY_TAG;
 105         header->host_hdl = to_host_hdl(ctx);
 106         header->copro_hdl = ctx->copro_hdl;
 107         header->command = command;
 108 }
 109
 110 int delta_ipc_open(struct delta_ctx *pctx, const char *name,
 111                    struct delta_ipc_param *param, u32 ipc_buf_size,
 112                    struct delta_buf **ipc_buf, void **hdl)
 113 {
 114         struct delta_dev *delta = pctx->dev;
 115         struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
 116         struct delta_ipc_ctx *ctx = &pctx->ipc_ctx;
 117         struct delta_ipc_open_msg msg;
 118         struct delta_buf *buf = &ctx->ipc_buf_struct;
 119         int ret;
 120
 121         if (!rpmsg_device) {
 122                 dev_err(delta->dev,
 123                         "%s   ipc: failed to open, rpmsg is not initialized\n",
 124                         pctx->name);
 125                 pctx->sys_errors++;
 126                 return -EINVAL;
 127         }
 128
 129         if (!name) {
 130                 dev_err(delta->dev,
 131                         "%s   ipc: failed to open, no name given\n",
 132                         pctx->name);
 133                 return -EINVAL;
 134         }
 135
 136         if (!param || !param->data || !param->size) {
 137                 dev_err(delta->dev,
 138                         "%s  ipc: failed to open, empty parameter\n",
 139                         pctx->name);
 140                 return -EINVAL;
 141         }
 142
 143         if (!ipc_buf_size) {
 144                 dev_err(delta->dev,
 145                         "%s   ipc: failed to open, no size given for ipc buffer\n",
 146                         pctx->name);
 147                 return -EINVAL;
 148         }
 149
 150         if (param->size > ipc_buf_size) {
 151                 dev_err(delta->dev,
 152                         "%s   ipc: failed to open, too large ipc parameter (%d bytes while max %d expected)\n",
 153                         pctx->name,
 154                         param->size, ctx->ipc_buf->size);
 155                 return -EINVAL;
 156         }
 157
 158         /* init */
 159         init_completion(&ctx->done);
 160
 161         /*
 162          * allocation of contiguous buffer for
 163          * data of commands exchanged between
 164          * host and firmware coprocessor
 165          */
 166         ret = hw_alloc(pctx, ipc_buf_size,
 167                        "ipc data buffer", buf);
 168         if (ret)
 169                 return ret;
 170         ctx->ipc_buf = buf;
 171
 172         /* build rpmsg message */
 173         build_msg_header(ctx, DELTA_IPC_OPEN, &msg.header);
 174
 175         msg.ipc_buf_size = ipc_buf_size;
 176         msg.ipc_buf_paddr = ctx->ipc_buf->paddr;
 177
 178         memcpy(msg.name, name, sizeof(msg.name));
 179         msg.name[sizeof(msg.name) - 1] = 0;
 180
 181         msg.param_size = param->size;
 182         memcpy(ctx->ipc_buf->vaddr, param->data, msg.param_size);
 183         msg.param_paddr = ctx->ipc_buf->paddr;
 184
 185         /* send it */
 186         ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
 187         if (ret) {
 188                 dev_err(delta->dev,
 189                         "%s   ipc: failed to open, rpmsg_send failed (%d) for DELTA_IPC_OPEN (name=%s, size=%d, data=%p)\n",
 190                         pctx->name,
 191                         ret, name, param->size, param->data);
 192                 goto err;
 193         }
 194
 195         /* wait for acknowledge */
 196         if (!wait_for_completion_timeout
 197             (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
 198                 dev_err(delta->dev,
 199                         "%s   ipc: failed to open, timeout waiting for DELTA_IPC_OPEN callback (name=%s, size=%d, data=%p)\n",
 200                         pctx->name,
 201                         name, param->size, param->data);
 202                 ret = -ETIMEDOUT;
 203                 goto err;
 204         }
 205
 206         /* command completed, check error */
 207         if (ctx->cb_err) {
 208                 dev_err(delta->dev,
 209                         "%s   ipc: failed to open, DELTA_IPC_OPEN completed but with error (%d) (name=%s, size=%d, data=%p)\n",
 210                         pctx->name,
 211                         ctx->cb_err, name, param->size, param->data);
 212                 ret = -EIO;
 213                 goto err;
 214         }
 215
 216         *ipc_buf = ctx->ipc_buf;
 217         *hdl = (void *)ctx;
 218
 219         return 0;
 220
 221 err:
 222         pctx->sys_errors++;
 223         if (ctx->ipc_buf) {
 224                 hw_free(pctx, ctx->ipc_buf);
 225                 ctx->ipc_buf = NULL;
 226         }
 227
 228         return ret;
 229 };
 230
 231 int delta_ipc_set_stream(void *hdl, struct delta_ipc_param *param)
 232 {
 233         struct delta_ipc_ctx *ctx = to_ctx(hdl);
 234         struct delta_ctx *pctx = to_pctx(ctx);
 235         struct delta_dev *delta = pctx->dev;
 236         struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
 237         struct delta_ipc_set_stream_msg msg;
 238         int ret;
 239
 240         if (!hdl) {
 241                 dev_err(delta->dev,
 242                         "%s   ipc: failed to set stream, invalid ipc handle\n",
 243                         pctx->name);
 244                 return -EINVAL;
 245         }
 246
 247         if (!rpmsg_device) {
 248                 dev_err(delta->dev,
 249                         "%s   ipc: failed to set stream, rpmsg is not initialized\n",
 250                         pctx->name);
 251                 return -EINVAL;
 252         }
 253
 254         if (!param || !param->data || !param->size) {
 255                 dev_err(delta->dev,
 256                         "%s  ipc: failed to set stream, empty parameter\n",
 257                         pctx->name);
 258                 return -EINVAL;
 259         }
 260
 261         if (param->size > ctx->ipc_buf->size) {
 262                 dev_err(delta->dev,
 263                         "%s   ipc: failed to set stream, too large ipc parameter(%d bytes while max %d expected)\n",
 264                         pctx->name,
 265                         param->size, ctx->ipc_buf->size);
 266                 return -EINVAL;
 267         }
 268
 269         if (!is_valid_data(ctx, param->data, param->size)) {
 270                 dev_err(delta->dev,
 271                         "%s   ipc: failed to set stream, parameter is not in expected address range (size=%d, data=%p not in %p..%p)\n",
 272                         pctx->name,
 273                         param->size,
 274                         param->data,
 275                         ctx->ipc_buf->vaddr,
 276                         ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
 277                 return -EINVAL;
 278         }
 279
 280         /* build rpmsg message */
 281         build_msg_header(ctx, DELTA_IPC_SET_STREAM, &msg.header);
 282
 283         msg.param_size = param->size;
 284         msg.param_paddr = to_paddr(ctx, param->data);
 285
 286         /* send it */
 287         ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
 288         if (ret) {
 289                 dev_err(delta->dev,
 290                         "%s   ipc: failed to set stream, rpmsg_send failed (%d) for DELTA_IPC_SET_STREAM (size=%d, data=%p)\n",
 291                         pctx->name,
 292                         ret, param->size, param->data);
 293                 pctx->sys_errors++;
 294                 return ret;
 295         }
 296
 297         /* wait for acknowledge */
 298         if (!wait_for_completion_timeout
 299             (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
 300                 dev_err(delta->dev,
 301                         "%s   ipc: failed to set stream, timeout waiting for DELTA_IPC_SET_STREAM callback (size=%d, data=%p)\n",
 302                         pctx->name,
 303                         param->size, param->data);
 304                 pctx->sys_errors++;
 305                 return -ETIMEDOUT;
 306         }
 307
 308         /* command completed, check status */
 309         if (ctx->cb_err) {
 310                 dev_err(delta->dev,
 311                         "%s   ipc: failed to set stream, DELTA_IPC_SET_STREAM completed but with error (%d) (size=%d, data=%p)\n",
 312                         pctx->name,
 313                         ctx->cb_err, param->size, param->data);
 314                 pctx->sys_errors++;
 315                 return -EIO;
 316         }
 317
 318         return 0;
 319 }
 320
 321 int delta_ipc_decode(void *hdl, struct delta_ipc_param *param,
 322                      struct delta_ipc_param *status)
 323 {
 324         struct delta_ipc_ctx *ctx = to_ctx(hdl);
 325         struct delta_ctx *pctx = to_pctx(ctx);
 326         struct delta_dev *delta = pctx->dev;
 327         struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
 328         struct delta_ipc_decode_msg msg;
 329         int ret;
 330
 331         if (!hdl) {
 332                 dev_err(delta->dev,
 333                         "%s   ipc: failed to decode, invalid ipc handle\n",
 334                         pctx->name);
 335                 return -EINVAL;
 336         }
 337
 338         if (!rpmsg_device) {
 339                 dev_err(delta->dev,
 340                         "%s   ipc: failed to decode, rpmsg is not initialized\n",
 341                         pctx->name);
 342                 return -EINVAL;
 343         }
 344
 345         if (!param || !param->data || !param->size) {
 346                 dev_err(delta->dev,
 347                         "%s  ipc: failed to decode, empty parameter\n",
 348                         pctx->name);
 349                 return -EINVAL;
 350         }
 351
 352         if (!status || !status->data || !status->size) {
 353                 dev_err(delta->dev,
 354                         "%s  ipc: failed to decode, empty status\n",
 355                         pctx->name);
 356                 return -EINVAL;
 357         }
 358
 359         if (param->size + status->size > ctx->ipc_buf->size) {
 360                 dev_err(delta->dev,
 361                         "%s   ipc: failed to decode, too large ipc parameter (%d bytes (param) + %d bytes (status) while max %d expected)\n",
 362                         pctx->name,
 363                         param->size,
 364                         status->size,
 365                         ctx->ipc_buf->size);
 366                 return -EINVAL;
 367         }
 368
 369         if (!is_valid_data(ctx, param->data, param->size)) {
 370                 dev_err(delta->dev,
 371                         "%s   ipc: failed to decode, parameter is not in expected address range (size=%d, data=%p not in %p..%p)\n",
 372                         pctx->name,
 373                         param->size,
 374                         param->data,
 375                         ctx->ipc_buf->vaddr,
 376                         ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
 377                 return -EINVAL;
 378         }
 379
 380         if (!is_valid_data(ctx, status->data, status->size)) {
 381                 dev_err(delta->dev,
 382                         "%s   ipc: failed to decode, status is not in expected address range (size=%d, data=%p not in %p..%p)\n",
 383                         pctx->name,
 384                         status->size,
 385                         status->data,
 386                         ctx->ipc_buf->vaddr,
 387                         ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
 388                 return -EINVAL;
 389         }
 390
 391         /* build rpmsg message */
 392         build_msg_header(ctx, DELTA_IPC_DECODE, &msg.header);
 393
 394         msg.param_size = param->size;
 395         msg.param_paddr = to_paddr(ctx, param->data);
 396
 397         msg.status_size = status->size;
 398         msg.status_paddr = to_paddr(ctx, status->data);
 399
 400         /* send it */
 401         ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
 402         if (ret) {
 403                 dev_err(delta->dev,
 404                         "%s   ipc: failed to decode, rpmsg_send failed (%d) for DELTA_IPC_DECODE (size=%d, data=%p)\n",
 405                         pctx->name,
 406                         ret, param->size, param->data);
 407                 pctx->sys_errors++;
 408                 return ret;
 409         }
 410
 411         /* wait for acknowledge */
 412         if (!wait_for_completion_timeout
 413             (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
 414                 dev_err(delta->dev,
 415                         "%s   ipc: failed to decode, timeout waiting for DELTA_IPC_DECODE callback (size=%d, data=%p)\n",
 416                         pctx->name,
 417                         param->size, param->data);
 418                 pctx->sys_errors++;
 419                 return -ETIMEDOUT;
 420         }
 421
 422         /* command completed, check status */
 423         if (ctx->cb_err) {
 424                 dev_err(delta->dev,
 425                         "%s   ipc: failed to decode, DELTA_IPC_DECODE completed but with error (%d) (size=%d, data=%p)\n",
 426                         pctx->name,
 427                         ctx->cb_err, param->size, param->data);
 428                 pctx->sys_errors++;
 429                 return -EIO;
 430         }
 431
 432         return 0;
 433 };
 434
 435 void delta_ipc_close(void *hdl)
 436 {
 437         struct delta_ipc_ctx *ctx = to_ctx(hdl);
 438         struct delta_ctx *pctx = to_pctx(ctx);
 439         struct delta_dev *delta = pctx->dev;
 440         struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
 441         struct delta_ipc_close_msg msg;
 442         int ret;
 443
 444         if (!hdl) {
 445                 dev_err(delta->dev,
 446                         "%s   ipc: failed to close, invalid ipc handle\n",
 447                         pctx->name);
 448                 return;
 449         }
 450
 451         if (ctx->ipc_buf) {
 452                 hw_free(pctx, ctx->ipc_buf);
 453                 ctx->ipc_buf = NULL;
 454         }
 455
 456         if (!rpmsg_device) {
 457                 dev_err(delta->dev,
 458                         "%s   ipc: failed to close, rpmsg is not initialized\n",
 459                         pctx->name);
 460                 return;
 461         }
 462
 463         /* build rpmsg message */
 464         build_msg_header(ctx, DELTA_IPC_CLOSE, &msg.header);
 465
 466         /* send it */
 467         ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
 468         if (ret) {
 469                 dev_err(delta->dev,
 470                         "%s   ipc: failed to close, rpmsg_send failed (%d) for DELTA_IPC_CLOSE\n",
 471                         pctx->name, ret);
 472                 pctx->sys_errors++;
 473                 return;
 474         }
 475
 476         /* wait for acknowledge */
 477         if (!wait_for_completion_timeout
 478             (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
 479                 dev_err(delta->dev,
 480                         "%s   ipc: failed to close, timeout waiting for DELTA_IPC_CLOSE callback\n",
 481                         pctx->name);
 482                 pctx->sys_errors++;
 483                 return;
 484         }
 485
 486         /* command completed, check status */
 487         if (ctx->cb_err) {
 488                 dev_err(delta->dev,
 489                         "%s   ipc: failed to close, DELTA_IPC_CLOSE completed but with error (%d)\n",
 490                         pctx->name, ctx->cb_err);
 491                 pctx->sys_errors++;
 492         }
 493 };
 494
 495 static int delta_ipc_cb(struct rpmsg_device *rpdev, void *data,
 496                         int len, void *priv, u32 src)
 497 {
 498         struct delta_ipc_ctx *ctx;
 499         struct delta_ipc_cb_msg *msg;
 500
 501         /* sanity check */
 502         if (!rpdev) {
 503                 dev_err(NULL, "rpdev is NULL\n");
 504                 return -EINVAL;
 505         }
 506
 507         if (!data || !len) {
 508                 dev_err(&rpdev->dev,
 509                         "unexpected empty message received from src=%d\n", src);
 510                 return -EINVAL;
 511         }
 512
 513         if (len != sizeof(*msg)) {
 514                 dev_err(&rpdev->dev,
 515                         "unexpected message length received from src=%d (received %d bytes while %zu bytes expected)\n",
 516                         len, src, sizeof(*msg));
 517                 return -EINVAL;
 518         }
 519
 520         msg = (struct delta_ipc_cb_msg *)data;
 521         if (msg->header.tag != IPC_SANITY_TAG) {
 522                 dev_err(&rpdev->dev,
 523                         "unexpected message tag received from src=%d (received %x tag while %x expected)\n",
 524                         src, msg->header.tag, IPC_SANITY_TAG);
 525                 return -EINVAL;
 526         }
 527
 528         ctx = msg_to_ctx(msg);
 529         if (!ctx) {
 530                 dev_err(&rpdev->dev,
 531                         "unexpected message with NULL host_hdl received from src=%d\n",
 532                         src);
 533                 return -EINVAL;
 534         }
 535
 536         /*
 537          * if not already known, save copro instance context
 538          * to ensure re-entrance on copro side
 539          */
 540         if (!ctx->copro_hdl)
 541                 ctx->copro_hdl = msg_to_copro_hdl(msg);
 542
 543         /*
 544          * all is fine,
 545          * update status & complete command
 546          */
 547         ctx->cb_err = msg->err;
 548         complete(&ctx->done);
 549
 550         return 0;
 551 }
 552
 553 static int delta_ipc_probe(struct rpmsg_device *rpmsg_device)
 554 {
 555         struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
 556         struct delta_dev *delta = to_delta(rpdrv);
 557
 558         delta->rpmsg_device = rpmsg_device;
 559
 560         return 0;
 561 }
 562
 563 static void delta_ipc_remove(struct rpmsg_device *rpmsg_device)
 564 {
 565         struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
 566         struct delta_dev *delta = to_delta(rpdrv);
 567
 568         delta->rpmsg_device = NULL;
 569 }
 570
 571 static struct rpmsg_device_id delta_ipc_device_id_table[] = {
 572         {.name = "rpmsg-delta"},
 573         {},
 574 };
 575
 576 static struct rpmsg_driver delta_rpmsg_driver = {
 577         .drv = {.name = KBUILD_MODNAME},
 578         .id_table = delta_ipc_device_id_table,
 579         .probe = delta_ipc_probe,
 580         .callback = delta_ipc_cb,
 581         .remove = delta_ipc_remove,
 582 };
 583
 584 int delta_ipc_init(struct delta_dev *delta)
 585 {
 586         delta->rpmsg_driver = delta_rpmsg_driver;
 587
 588         return register_rpmsg_driver(&delta->rpmsg_driver);
 589 }
 590
 591 void delta_ipc_exit(struct delta_dev *delta)
 592 {
 593         unregister_rpmsg_driver(&delta->rpmsg_driver);
 594 }