drivers/media/pci/saa7164/saa7164-cmd.c

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/wait.h>
  23
  24 #include "saa7164.h"
  25
  26 static int saa7164_cmd_alloc_seqno(struct saa7164_dev *dev)
  27 {
  28         int i, ret = -1;
  29
  30         mutex_lock(&dev->lock);
  31         for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
  32                 if (dev->cmds[i].inuse == 0) {
  33                         dev->cmds[i].inuse = 1;
  34                         dev->cmds[i].signalled = 0;
  35                         dev->cmds[i].timeout = 0;
  36                         ret = dev->cmds[i].seqno;
  37                         break;
  38                 }
  39         }
  40         mutex_unlock(&dev->lock);
  41
  42         return ret;
  43 }
  44
  45 static void saa7164_cmd_free_seqno(struct saa7164_dev *dev, u8 seqno)
  46 {
  47         mutex_lock(&dev->lock);
  48         if ((dev->cmds[seqno].inuse == 1) &&
  49                 (dev->cmds[seqno].seqno == seqno)) {
  50                 dev->cmds[seqno].inuse = 0;
  51                 dev->cmds[seqno].signalled = 0;
  52                 dev->cmds[seqno].timeout = 0;
  53         }
  54         mutex_unlock(&dev->lock);
  55 }
  56
  57 static void saa7164_cmd_timeout_seqno(struct saa7164_dev *dev, u8 seqno)
  58 {
  59         mutex_lock(&dev->lock);
  60         if ((dev->cmds[seqno].inuse == 1) &&
  61                 (dev->cmds[seqno].seqno == seqno)) {
  62                 dev->cmds[seqno].timeout = 1;
  63         }
  64         mutex_unlock(&dev->lock);
  65 }
  66
  67 static u32 saa7164_cmd_timeout_get(struct saa7164_dev *dev, u8 seqno)
  68 {
  69         int ret = 0;
  70
  71         mutex_lock(&dev->lock);
  72         if ((dev->cmds[seqno].inuse == 1) &&
  73                 (dev->cmds[seqno].seqno == seqno)) {
  74                 ret = dev->cmds[seqno].timeout;
  75         }
  76         mutex_unlock(&dev->lock);
  77
  78         return ret;
  79 }
  80
  81 /* Commands to the f/w get marshelled to/from this code then onto the PCI
  82  * -bus/c running buffer. */
  83 int saa7164_irq_dequeue(struct saa7164_dev *dev)
  84 {
  85         int ret = SAA_OK, i = 0;
  86         u32 timeout;
  87         wait_queue_head_t *q = NULL;
  88         u8 tmp[512];
  89         dprintk(DBGLVL_CMD, "%s()\n", __func__);
  90
  91         /* While any outstand message on the bus exists... */
  92         do {
  93
  94                 /* Peek the msg bus */
  95                 struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
  96                 ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
  97                 if (ret != SAA_OK)
  98                         break;
  99
 100                 q = &dev->cmds[tRsp.seqno].wait;
 101                 timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
 102                 dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
 103                 if (!timeout) {
 104                         dprintk(DBGLVL_CMD,
 105                                 "%s() signalled seqno(%d) (for dequeue)\n",
 106                                 __func__, tRsp.seqno);
 107                         dev->cmds[tRsp.seqno].signalled = 1;
 108                         wake_up(q);
 109                 } else {
 110                         printk(KERN_ERR
 111                                 "%s() found timed out command on the bus\n",
 112                                         __func__);
 113
 114                         /* Clean the bus */
 115                         ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
 116                         printk(KERN_ERR "%s() ret = %x\n", __func__, ret);
 117                         if (ret == SAA_ERR_EMPTY)
 118                                 /* Someone else already fetched the response */
 119                                 return SAA_OK;
 120
 121                         if (ret != SAA_OK)
 122                                 return ret;
 123                 }
 124
 125                 /* It's unlikely to have more than 4 or 5 pending messages,
 126                  * ensure we exit at some point regardless.
 127                  */
 128         } while (i++ < 32);
 129
 130         return ret;
 131 }
 132
 133 /* Commands to the f/w get marshelled to/from this code then onto the PCI
 134  * -bus/c running buffer. */
 135 static int saa7164_cmd_dequeue(struct saa7164_dev *dev)
 136 {
 137         int loop = 1;
 138         int ret;
 139         u32 timeout;
 140         wait_queue_head_t *q = NULL;
 141         u8 tmp[512];
 142         dprintk(DBGLVL_CMD, "%s()\n", __func__);
 143
 144         while (loop) {
 145
 146                 struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
 147                 ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
 148                 if (ret == SAA_ERR_EMPTY)
 149                         return SAA_OK;
 150
 151                 if (ret != SAA_OK)
 152                         return ret;
 153
 154                 q = &dev->cmds[tRsp.seqno].wait;
 155                 timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
 156                 dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
 157                 if (timeout) {
 158                         printk(KERN_ERR "found timed out command on the bus\n");
 159
 160                         /* Clean the bus */
 161                         ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
 162                         printk(KERN_ERR "ret = %x\n", ret);
 163                         if (ret == SAA_ERR_EMPTY)
 164                                 /* Someone else already fetched the response */
 165                                 return SAA_OK;
 166
 167                         if (ret != SAA_OK)
 168                                 return ret;
 169
 170                         if (tRsp.flags & PVC_CMDFLAG_CONTINUE)
 171                                 printk(KERN_ERR "split response\n");
 172                         else
 173                                 saa7164_cmd_free_seqno(dev, tRsp.seqno);
 174
 175                         printk(KERN_ERR " timeout continue\n");
 176                         continue;
 177                 }
 178
 179                 dprintk(DBGLVL_CMD, "%s() signalled seqno(%d) (for dequeue)\n",
 180                         __func__, tRsp.seqno);
 181                 dev->cmds[tRsp.seqno].signalled = 1;
 182                 wake_up(q);
 183                 return SAA_OK;
 184         }
 185
 186         return SAA_OK;
 187 }
 188
 189 static int saa7164_cmd_set(struct saa7164_dev *dev, struct tmComResInfo *msg,
 190                            void *buf)
 191 {
 192         struct tmComResBusInfo *bus = &dev->bus;
 193         u8 cmd_sent;
 194         u16 size, idx;
 195         u32 cmds;
 196         void *tmp;
 197         int ret = -1;
 198
 199         if (!msg) {
 200                 printk(KERN_ERR "%s() !msg\n", __func__);
 201                 return SAA_ERR_BAD_PARAMETER;
 202         }
 203
 204         mutex_lock(&dev->cmds[msg->id].lock);
 205
 206         size = msg->size;
 207         idx = 0;
 208         cmds = size / bus->m_wMaxReqSize;
 209         if (size % bus->m_wMaxReqSize == 0)
 210                 cmds -= 1;
 211
 212         cmd_sent = 0;
 213
 214         /* Split the request into smaller chunks */
 215         for (idx = 0; idx < cmds; idx++) {
 216
 217                 msg->flags |= SAA_CMDFLAG_CONTINUE;
 218                 msg->size = bus->m_wMaxReqSize;
 219                 tmp = buf + idx * bus->m_wMaxReqSize;
 220
 221                 ret = saa7164_bus_set(dev, msg, tmp);
 222                 if (ret != SAA_OK) {
 223                         printk(KERN_ERR "%s() set failed %d\n", __func__, ret);
 224
 225                         if (cmd_sent) {
 226                                 ret = SAA_ERR_BUSY;
 227                                 goto out;
 228                         }
 229                         ret = SAA_ERR_OVERFLOW;
 230                         goto out;
 231                 }
 232                 cmd_sent = 1;
 233         }
 234
 235         /* If not the last command... */
 236         if (idx != 0)
 237                 msg->flags &= ~SAA_CMDFLAG_CONTINUE;
 238
 239         msg->size = size - idx * bus->m_wMaxReqSize;
 240
 241         ret = saa7164_bus_set(dev, msg, buf + idx * bus->m_wMaxReqSize);
 242         if (ret != SAA_OK) {
 243                 printk(KERN_ERR "%s() set last failed %d\n", __func__, ret);
 244
 245                 if (cmd_sent) {
 246                         ret = SAA_ERR_BUSY;
 247                         goto out;
 248                 }
 249                 ret = SAA_ERR_OVERFLOW;
 250                 goto out;
 251         }
 252         ret = SAA_OK;
 253
 254 out:
 255         mutex_unlock(&dev->cmds[msg->id].lock);
 256         return ret;
 257 }
 258
 259 /* Wait for a signal event, without holding a mutex. Either return TIMEOUT if
 260  * the event never occurred, or SAA_OK if it was signaled during the wait.
 261  */
 262 static int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
 263 {
 264         wait_queue_head_t *q = NULL;
 265         int ret = SAA_BUS_TIMEOUT;
 266         unsigned long stamp;
 267         int r;
 268
 269         if (saa_debug >= 4)
 270                 saa7164_bus_dump(dev);
 271
 272         dprintk(DBGLVL_CMD, "%s(seqno=%d)\n", __func__, seqno);
 273
 274         mutex_lock(&dev->lock);
 275         if ((dev->cmds[seqno].inuse == 1) &&
 276                 (dev->cmds[seqno].seqno == seqno)) {
 277                 q = &dev->cmds[seqno].wait;
 278         }
 279         mutex_unlock(&dev->lock);
 280
 281         if (q) {
 282                 /* If we haven't been signalled we need to wait */
 283                 if (dev->cmds[seqno].signalled == 0) {
 284                         stamp = jiffies;
 285                         dprintk(DBGLVL_CMD,
 286                                 "%s(seqno=%d) Waiting (signalled=%d)\n",
 287                                 __func__, seqno, dev->cmds[seqno].signalled);
 288
 289                         /* Wait for signalled to be flagged or timeout */
 290                         /* In a highly stressed system this can easily extend
 291                          * into multiple seconds before the deferred worker
 292                          * is scheduled, and we're woken up via signal.
 293                          * We typically are signalled in < 50ms but it can
 294                          * take MUCH longer.
 295                          */
 296                         wait_event_timeout(*q, dev->cmds[seqno].signalled,
 297                                 (HZ * waitsecs));
 298                         r = time_before(jiffies, stamp + (HZ * waitsecs));
 299                         if (r)
 300                                 ret = SAA_OK;
 301                         else
 302                                 saa7164_cmd_timeout_seqno(dev, seqno);
 303
 304                         dprintk(DBGLVL_CMD, "%s(seqno=%d) Waiting res = %d "
 305                                 "(signalled=%d)\n", __func__, seqno, r,
 306                                 dev->cmds[seqno].signalled);
 307                 } else
 308                         ret = SAA_OK;
 309         } else
 310                 printk(KERN_ERR "%s(seqno=%d) seqno is invalid\n",
 311                         __func__, seqno);
 312
 313         return ret;
 314 }
 315
 316 void saa7164_cmd_signal(struct saa7164_dev *dev, u8 seqno)
 317 {
 318         int i;
 319         dprintk(DBGLVL_CMD, "%s()\n", __func__);
 320
 321         mutex_lock(&dev->lock);
 322         for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
 323                 if (dev->cmds[i].inuse == 1) {
 324                         dprintk(DBGLVL_CMD,
 325                                 "seqno %d inuse, sig = %d, t/out = %d\n",
 326                                 dev->cmds[i].seqno,
 327                                 dev->cmds[i].signalled,
 328                                 dev->cmds[i].timeout);
 329                 }
 330         }
 331
 332         for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
 333                 if ((dev->cmds[i].inuse == 1) && ((i == 0) ||
 334                         (dev->cmds[i].signalled) || (dev->cmds[i].timeout))) {
 335                         dprintk(DBGLVL_CMD, "%s(seqno=%d) calling wake_up\n",
 336                                 __func__, i);
 337                         dev->cmds[i].signalled = 1;
 338                         wake_up(&dev->cmds[i].wait);
 339                 }
 340         }
 341         mutex_unlock(&dev->lock);
 342 }
 343
 344 int saa7164_cmd_send(struct saa7164_dev *dev, u8 id, enum tmComResCmd command,
 345         u16 controlselector, u16 size, void *buf)
 346 {
 347         struct tmComResInfo command_t, *pcommand_t;
 348         struct tmComResInfo response_t, *presponse_t;
 349         u8 errdata[256];
 350         u16 resp_dsize;
 351         u16 data_recd;
 352         u32 loop;
 353         int ret;
 354         int safety = 0;
 355
 356         dprintk(DBGLVL_CMD, "%s(unitid = %s (%d) , command = 0x%x, "
 357                 "sel = 0x%x)\n", __func__, saa7164_unitid_name(dev, id), id,
 358                 command, controlselector);
 359
 360         if ((size == 0) || (buf == NULL)) {
 361                 printk(KERN_ERR "%s() Invalid param\n", __func__);
 362                 return SAA_ERR_BAD_PARAMETER;
 363         }
 364
 365         /* Prepare some basic command/response structures */
 366         memset(&command_t, 0, sizeof(command_t));
 367         memset(&response_t, 0, sizeof(response_t));
 368         pcommand_t = &command_t;
 369         presponse_t = &response_t;
 370         command_t.id = id;
 371         command_t.command = command;
 372         command_t.controlselector = controlselector;
 373         command_t.size = size;
 374
 375         /* Allocate a unique sequence number */
 376         ret = saa7164_cmd_alloc_seqno(dev);
 377         if (ret < 0) {
 378                 printk(KERN_ERR "%s() No free sequences\n", __func__);
 379                 ret = SAA_ERR_NO_RESOURCES;
 380                 goto out;
 381         }
 382
 383         command_t.seqno = (u8)ret;
 384
 385         /* Send Command */
 386         resp_dsize = size;
 387         pcommand_t->size = size;
 388
 389         dprintk(DBGLVL_CMD, "%s() pcommand_t.seqno = %d\n",
 390                 __func__, pcommand_t->seqno);
 391
 392         dprintk(DBGLVL_CMD, "%s() pcommand_t.size = %d\n",
 393                 __func__, pcommand_t->size);
 394
 395         ret = saa7164_cmd_set(dev, pcommand_t, buf);
 396         if (ret != SAA_OK) {
 397                 printk(KERN_ERR "%s() set command failed %d\n", __func__, ret);
 398
 399                 if (ret != SAA_ERR_BUSY)
 400                         saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
 401                 else
 402                         /* Flag a timeout, because at least one
 403                          * command was sent */
 404                         saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
 405
 406                 goto out;
 407         }
 408
 409         /* With split responses we have to collect the msgs piece by piece */
 410         data_recd = 0;
 411         loop = 1;
 412         while (loop) {
 413                 dprintk(DBGLVL_CMD, "%s() loop\n", __func__);
 414
 415                 ret = saa7164_cmd_wait(dev, pcommand_t->seqno);
 416                 dprintk(DBGLVL_CMD, "%s() loop ret = %d\n", __func__, ret);
 417
 418                 /* if power is down and this is not a power command ... */
 419
 420                 if (ret == SAA_BUS_TIMEOUT) {
 421                         printk(KERN_ERR "Event timed out\n");
 422                         saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
 423                         return ret;
 424                 }
 425
 426                 if (ret != SAA_OK) {
 427                         printk(KERN_ERR "spurious error\n");
 428                         return ret;
 429                 }
 430
 431                 /* Peek response */
 432                 ret = saa7164_bus_get(dev, presponse_t, NULL, 1);
 433                 if (ret == SAA_ERR_EMPTY) {
 434                         dprintk(4, "%s() SAA_ERR_EMPTY\n", __func__);
 435                         continue;
 436                 }
 437                 if (ret != SAA_OK) {
 438                         printk(KERN_ERR "peek failed\n");
 439                         return ret;
 440                 }
 441
 442                 dprintk(DBGLVL_CMD, "%s() presponse_t->seqno = %d\n",
 443                         __func__, presponse_t->seqno);
 444
 445                 dprintk(DBGLVL_CMD, "%s() presponse_t->flags = 0x%x\n",
 446                         __func__, presponse_t->flags);
 447
 448                 dprintk(DBGLVL_CMD, "%s() presponse_t->size = %d\n",
 449                         __func__, presponse_t->size);
 450
 451                 /* Check if the response was for our command */
 452                 if (presponse_t->seqno != pcommand_t->seqno) {
 453
 454                         dprintk(DBGLVL_CMD,
 455                                 "wrong event: seqno = %d, "
 456                                 "expected seqno = %d, "
 457                                 "will dequeue regardless\n",
 458                                 presponse_t->seqno, pcommand_t->seqno);
 459
 460                         ret = saa7164_cmd_dequeue(dev);
 461                         if (ret != SAA_OK) {
 462                                 printk(KERN_ERR "dequeue failed, ret = %d\n",
 463                                         ret);
 464                                 if (safety++ > 16) {
 465                                         printk(KERN_ERR
 466                                         "dequeue exceeded, safety exit\n");
 467                                         return SAA_ERR_BUSY;
 468                                 }
 469                         }
 470
 471                         continue;
 472                 }
 473
 474                 if ((presponse_t->flags & PVC_RESPONSEFLAG_ERROR) != 0) {
 475
 476                         memset(&errdata[0], 0, sizeof(errdata));
 477
 478                         ret = saa7164_bus_get(dev, presponse_t, &errdata[0], 0);
 479                         if (ret != SAA_OK) {
 480                                 printk(KERN_ERR "get error(2)\n");
 481                                 return ret;
 482                         }
 483
 484                         saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
 485
 486                         dprintk(DBGLVL_CMD, "%s() errdata %02x%02x%02x%02x\n",
 487                                 __func__, errdata[0], errdata[1], errdata[2],
 488                                 errdata[3]);
 489
 490                         /* Map error codes */
 491                         dprintk(DBGLVL_CMD, "%s() cmd, error code  = 0x%x\n",
 492                                 __func__, errdata[0]);
 493
 494                         switch (errdata[0]) {
 495                         case PVC_ERRORCODE_INVALID_COMMAND:
 496                                 dprintk(DBGLVL_CMD, "%s() INVALID_COMMAND\n",
 497                                         __func__);
 498                                 ret = SAA_ERR_INVALID_COMMAND;
 499                                 break;
 500                         case PVC_ERRORCODE_INVALID_DATA:
 501                                 dprintk(DBGLVL_CMD, "%s() INVALID_DATA\n",
 502                                         __func__);
 503                                 ret = SAA_ERR_BAD_PARAMETER;
 504                                 break;
 505                         case PVC_ERRORCODE_TIMEOUT:
 506                                 dprintk(DBGLVL_CMD, "%s() TIMEOUT\n", __func__);
 507                                 ret = SAA_ERR_TIMEOUT;
 508                                 break;
 509                         case PVC_ERRORCODE_NAK:
 510                                 dprintk(DBGLVL_CMD, "%s() NAK\n", __func__);
 511                                 ret = SAA_ERR_NULL_PACKET;
 512                                 break;
 513                         case PVC_ERRORCODE_UNKNOWN:
 514                         case PVC_ERRORCODE_INVALID_CONTROL:
 515                                 dprintk(DBGLVL_CMD,
 516                                         "%s() UNKNOWN OR INVALID CONTROL\n",
 517                                         __func__);
 518                         default:
 519                                 dprintk(DBGLVL_CMD, "%s() UNKNOWN\n", __func__);
 520                                 ret = SAA_ERR_NOT_SUPPORTED;
 521                         }
 522
 523                         /* See of other commands are on the bus */
 524                         if (saa7164_cmd_dequeue(dev) != SAA_OK)
 525                                 printk(KERN_ERR "dequeue(2) failed\n");
 526
 527                         return ret;
 528                 }
 529
 530                 /* If response is invalid */
 531                 if ((presponse_t->id != pcommand_t->id) ||
 532                         (presponse_t->command != pcommand_t->command) ||
 533                         (presponse_t->controlselector !=
 534                                 pcommand_t->controlselector) ||
 535                         (((resp_dsize - data_recd) != presponse_t->size) &&
 536                                 !(presponse_t->flags & PVC_CMDFLAG_CONTINUE)) ||
 537                         ((resp_dsize - data_recd) < presponse_t->size)) {
 538
 539                         /* Invalid */
 540                         dprintk(DBGLVL_CMD, "%s() Invalid\n", __func__);
 541                         ret = saa7164_bus_get(dev, presponse_t, NULL, 0);
 542                         if (ret != SAA_OK) {
 543                                 printk(KERN_ERR "get failed\n");
 544                                 return ret;
 545                         }
 546
 547                         /* See of other commands are on the bus */
 548                         if (saa7164_cmd_dequeue(dev) != SAA_OK)
 549                                 printk(KERN_ERR "dequeue(3) failed\n");
 550                         continue;
 551                 }
 552
 553                 /* OK, now we're actually getting out correct response */
 554                 ret = saa7164_bus_get(dev, presponse_t, buf + data_recd, 0);
 555                 if (ret != SAA_OK) {
 556                         printk(KERN_ERR "get failed\n");
 557                         return ret;
 558                 }
 559
 560                 data_recd = presponse_t->size + data_recd;
 561                 if (resp_dsize == data_recd) {
 562                         dprintk(DBGLVL_CMD, "%s() Resp recd\n", __func__);
 563                         break;
 564                 }
 565
 566                 /* See of other commands are on the bus */
 567                 if (saa7164_cmd_dequeue(dev) != SAA_OK)
 568                         printk(KERN_ERR "dequeue(3) failed\n");
 569
 570                 continue;
 571
 572         } /* (loop) */
 573
 574         /* Release the sequence number allocation */
 575         saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
 576
 577         /* if powerdown signal all pending commands */
 578
 579         dprintk(DBGLVL_CMD, "%s() Calling dequeue then exit\n", __func__);
 580
 581         /* See of other commands are on the bus */
 582         if (saa7164_cmd_dequeue(dev) != SAA_OK)
 583                 printk(KERN_ERR "dequeue(4) failed\n");
 584
 585         ret = SAA_OK;
 586 out:
 587         return ret;
 588 }
 589