drivers/staging/crystalhd/crystalhd_misc.c

   1 /***************************************************************************
   2  *         Copyright (c) 2005-2009, Broadcom Corporation.
   3  *
   4  *  Name: crystalhd_misc . c
   5  *
   6  *  Description:
   7  *              BCM70012 Linux driver misc routines.
   8  *
   9  *  HISTORY:
  10  *
  11  **********************************************************************
  12  * This file is part of the crystalhd device driver.
  13  *
  14  * This driver is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation, version 2 of the License.
  17  *
  18  * This driver is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this driver.  If not, see <http://www.gnu.org/licenses/>.
  25  **********************************************************************/
  26
  27 #include <linux/slab.h>
  28
  29 #include "crystalhd_misc.h"
  30 #include "crystalhd_lnx.h"
  31
  32 uint32_t g_linklog_level;
  33
  34 static inline uint32_t crystalhd_dram_rd(struct crystalhd_adp *adp, uint32_t mem_off)
  35 {
  36         crystalhd_reg_wr(adp, DCI_DRAM_BASE_ADDR, (mem_off >> 19));
  37         return bc_dec_reg_rd(adp, (0x00380000 | (mem_off & 0x0007FFFF)));
  38 }
  39
  40 static inline void crystalhd_dram_wr(struct crystalhd_adp *adp, uint32_t mem_off, uint32_t val)
  41 {
  42         crystalhd_reg_wr(adp, DCI_DRAM_BASE_ADDR, (mem_off >> 19));
  43         bc_dec_reg_wr(adp, (0x00380000 | (mem_off & 0x0007FFFF)), val);
  44 }
  45
  46 static inline enum BC_STATUS bc_chk_dram_range(struct crystalhd_adp *adp, uint32_t start_off, uint32_t cnt)
  47 {
  48         return BC_STS_SUCCESS;
  49 }
  50
  51 static struct crystalhd_dio_req *crystalhd_alloc_dio(struct crystalhd_adp *adp)
  52 {
  53         unsigned long flags = 0;
  54         struct crystalhd_dio_req *temp = NULL;
  55
  56         if (!adp) {
  57                 BCMLOG_ERR("Invalid Arg!!\n");
  58                 return temp;
  59         }
  60
  61         spin_lock_irqsave(&adp->lock, flags);
  62         temp = adp->ua_map_free_head;
  63         if (temp)
  64                 adp->ua_map_free_head = adp->ua_map_free_head->next;
  65         spin_unlock_irqrestore(&adp->lock, flags);
  66
  67         return temp;
  68 }
  69
  70 static void crystalhd_free_dio(struct crystalhd_adp *adp, struct crystalhd_dio_req *dio)
  71 {
  72         unsigned long flags = 0;
  73
  74         if (!adp || !dio)
  75                 return;
  76         spin_lock_irqsave(&adp->lock, flags);
  77         dio->sig = crystalhd_dio_inv;
  78         dio->page_cnt = 0;
  79         dio->fb_size = 0;
  80         memset(&dio->uinfo, 0, sizeof(dio->uinfo));
  81         dio->next = adp->ua_map_free_head;
  82         adp->ua_map_free_head = dio;
  83         spin_unlock_irqrestore(&adp->lock, flags);
  84 }
  85
  86 static struct crystalhd_elem *crystalhd_alloc_elem(struct crystalhd_adp *adp)
  87 {
  88         unsigned long flags = 0;
  89         struct crystalhd_elem *temp = NULL;
  90
  91         if (!adp)
  92                 return temp;
  93         spin_lock_irqsave(&adp->lock, flags);
  94         temp = adp->elem_pool_head;
  95         if (temp) {
  96                 adp->elem_pool_head = adp->elem_pool_head->flink;
  97                 memset(temp, 0, sizeof(*temp));
  98         }
  99         spin_unlock_irqrestore(&adp->lock, flags);
 100
 101         return temp;
 102 }
 103 static void crystalhd_free_elem(struct crystalhd_adp *adp, struct crystalhd_elem *elem)
 104 {
 105         unsigned long flags = 0;
 106
 107         if (!adp || !elem)
 108                 return;
 109         spin_lock_irqsave(&adp->lock, flags);
 110         elem->flink = adp->elem_pool_head;
 111         adp->elem_pool_head = elem;
 112         spin_unlock_irqrestore(&adp->lock, flags);
 113 }
 114
 115 static inline void crystalhd_set_sg(struct scatterlist *sg, struct page *page,
 116                                   unsigned int len, unsigned int offset)
 117 {
 118         sg_set_page(sg, page, len, offset);
 119 #ifdef CONFIG_X86_64
 120         sg->dma_length = len;
 121 #endif
 122 }
 123
 124 static inline void crystalhd_init_sg(struct scatterlist *sg, unsigned int entries)
 125 {
 126         /* http://lkml.org/lkml/2007/11/27/68 */
 127         sg_init_table(sg, entries);
 128 }
 129
 130 /*========================== Extern ========================================*/
 131 /**
 132  * bc_dec_reg_rd - Read 7412's device register.
 133  * @adp: Adapter instance
 134  * @reg_off: Register offset.
 135  *
 136  * Return:
 137  *      32bit value read
 138  *
 139  * 7412's device register read routine. This interface use
 140  * 7412's device access range mapped from BAR-2 (4M) of PCIe
 141  * configuration space.
 142  */
 143 uint32_t bc_dec_reg_rd(struct crystalhd_adp *adp, uint32_t reg_off)
 144 {
 145         if (!adp || (reg_off > adp->pci_mem_len)) {
 146                 BCMLOG_ERR("dec_rd_reg_off outof range: 0x%08x\n", reg_off);
 147                 return 0;
 148         }
 149
 150         return readl(adp->addr + reg_off);
 151 }
 152
 153 /**
 154  * bc_dec_reg_wr - Write 7412's device register
 155  * @adp: Adapter instance
 156  * @reg_off: Register offset.
 157  * @val: Dword value to be written.
 158  *
 159  * Return:
 160  *      none.
 161  *
 162  * 7412's device register write routine. This interface use
 163  * 7412's device access range mapped from BAR-2 (4M) of PCIe
 164  * configuration space.
 165  */
 166 void bc_dec_reg_wr(struct crystalhd_adp *adp, uint32_t reg_off, uint32_t val)
 167 {
 168         if (!adp || (reg_off > adp->pci_mem_len)) {
 169                 BCMLOG_ERR("dec_wr_reg_off outof range: 0x%08x\n", reg_off);
 170                 return;
 171         }
 172         writel(val, adp->addr + reg_off);
 173         udelay(8);
 174 }
 175
 176 /**
 177  * crystalhd_reg_rd - Read Link's device register.
 178  * @adp: Adapter instance
 179  * @reg_off: Register offset.
 180  *
 181  * Return:
 182  *      32bit value read
 183  *
 184  * Link device register  read routine. This interface use
 185  * Link's device access range mapped from BAR-1 (64K) of PCIe
 186  * configuration space.
 187  *
 188  */
 189 uint32_t crystalhd_reg_rd(struct crystalhd_adp *adp, uint32_t reg_off)
 190 {
 191         if (!adp || (reg_off > adp->pci_i2o_len)) {
 192                 BCMLOG_ERR("link_rd_reg_off outof range: 0x%08x\n", reg_off);
 193                 return 0;
 194         }
 195         return readl(adp->i2o_addr + reg_off);
 196 }
 197
 198 /**
 199  * crystalhd_reg_wr - Write Link's device register
 200  * @adp: Adapter instance
 201  * @reg_off: Register offset.
 202  * @val: Dword value to be written.
 203  *
 204  * Return:
 205  *      none.
 206  *
 207  * Link device register  write routine. This interface use
 208  * Link's device access range mapped from BAR-1 (64K) of PCIe
 209  * configuration space.
 210  *
 211  */
 212 void crystalhd_reg_wr(struct crystalhd_adp *adp, uint32_t reg_off, uint32_t val)
 213 {
 214         if (!adp || (reg_off > adp->pci_i2o_len)) {
 215                 BCMLOG_ERR("link_wr_reg_off outof range: 0x%08x\n", reg_off);
 216                 return;
 217         }
 218         writel(val, adp->i2o_addr + reg_off);
 219 }
 220
 221 /**
 222  * crystalhd_mem_rd - Read data from 7412's DRAM area.
 223  * @adp: Adapter instance
 224  * @start_off: Start offset.
 225  * @dw_cnt: Count in dwords.
 226  * @rd_buff: Buffer to copy the data from dram.
 227  *
 228  * Return:
 229  *      Status.
 230  *
 231  * 7412's Dram read routine.
 232  */
 233 enum BC_STATUS crystalhd_mem_rd(struct crystalhd_adp *adp, uint32_t start_off,
 234                          uint32_t dw_cnt, uint32_t *rd_buff)
 235 {
 236         uint32_t ix = 0;
 237
 238         if (!adp || !rd_buff ||
 239             (bc_chk_dram_range(adp, start_off, dw_cnt) != BC_STS_SUCCESS)) {
 240                 BCMLOG_ERR("Invalid arg\n");
 241                 return BC_STS_INV_ARG;
 242         }
 243         for (ix = 0; ix < dw_cnt; ix++)
 244                 rd_buff[ix] = crystalhd_dram_rd(adp, (start_off + (ix * 4)));
 245
 246         return BC_STS_SUCCESS;
 247 }
 248
 249 /**
 250  * crystalhd_mem_wr - Write data to 7412's DRAM area.
 251  * @adp: Adapter instance
 252  * @start_off: Start offset.
 253  * @dw_cnt: Count in dwords.
 254  * @wr_buff: Data Buffer to be written.
 255  *
 256  * Return:
 257  *      Status.
 258  *
 259  * 7412's Dram write routine.
 260  */
 261 enum BC_STATUS crystalhd_mem_wr(struct crystalhd_adp *adp, uint32_t start_off,
 262                          uint32_t dw_cnt, uint32_t *wr_buff)
 263 {
 264         uint32_t ix = 0;
 265
 266         if (!adp || !wr_buff ||
 267             (bc_chk_dram_range(adp, start_off, dw_cnt) != BC_STS_SUCCESS)) {
 268                 BCMLOG_ERR("Invalid arg\n");
 269                 return BC_STS_INV_ARG;
 270         }
 271
 272         for (ix = 0; ix < dw_cnt; ix++)
 273                 crystalhd_dram_wr(adp, (start_off + (ix * 4)), wr_buff[ix]);
 274
 275         return BC_STS_SUCCESS;
 276 }
 277 /**
 278  * crystalhd_pci_cfg_rd - PCIe config read
 279  * @adp: Adapter instance
 280  * @off: PCI config space offset.
 281  * @len: Size -- Byte, Word & dword.
 282  * @val: Value read
 283  *
 284  * Return:
 285  *      Status.
 286  *
 287  * Get value from Link's PCIe config space.
 288  */
 289 enum BC_STATUS crystalhd_pci_cfg_rd(struct crystalhd_adp *adp, uint32_t off,
 290                              uint32_t len, uint32_t *val)
 291 {
 292         enum BC_STATUS sts = BC_STS_SUCCESS;
 293         int rc = 0;
 294
 295         if (!adp || !val) {
 296                 BCMLOG_ERR("Invalid arg\n");
 297                 return BC_STS_INV_ARG;
 298         }
 299
 300         switch (len) {
 301         case 1:
 302                 rc = pci_read_config_byte(adp->pdev, off, (u8 *)val);
 303                 break;
 304         case 2:
 305                 rc = pci_read_config_word(adp->pdev, off, (u16 *)val);
 306                 break;
 307         case 4:
 308                 rc = pci_read_config_dword(adp->pdev, off, (u32 *)val);
 309                 break;
 310         default:
 311                 rc = -EINVAL;
 312                 sts = BC_STS_INV_ARG;
 313                 BCMLOG_ERR("Invalid len:%d\n", len);
 314         };
 315
 316         if (rc && (sts == BC_STS_SUCCESS))
 317                 sts = BC_STS_ERROR;
 318
 319         return sts;
 320 }
 321
 322 /**
 323  * crystalhd_pci_cfg_wr - PCIe config write
 324  * @adp: Adapter instance
 325  * @off: PCI config space offset.
 326  * @len: Size -- Byte, Word & dword.
 327  * @val: Value to be written
 328  *
 329  * Return:
 330  *      Status.
 331  *
 332  * Set value to Link's PCIe config space.
 333  */
 334 enum BC_STATUS crystalhd_pci_cfg_wr(struct crystalhd_adp *adp, uint32_t off,
 335                              uint32_t len, uint32_t val)
 336 {
 337         enum BC_STATUS sts = BC_STS_SUCCESS;
 338         int rc = 0;
 339
 340         if (!adp || !val) {
 341                 BCMLOG_ERR("Invalid arg\n");
 342                 return BC_STS_INV_ARG;
 343         }
 344
 345         switch (len) {
 346         case 1:
 347                 rc = pci_write_config_byte(adp->pdev, off, (u8)val);
 348                 break;
 349         case 2:
 350                 rc = pci_write_config_word(adp->pdev, off, (u16)val);
 351                 break;
 352         case 4:
 353                 rc = pci_write_config_dword(adp->pdev, off, val);
 354                 break;
 355         default:
 356                 rc = -EINVAL;
 357                 sts = BC_STS_INV_ARG;
 358                 BCMLOG_ERR("Invalid len:%d\n", len);
 359         };
 360
 361         if (rc && (sts == BC_STS_SUCCESS))
 362                 sts = BC_STS_ERROR;
 363
 364         return sts;
 365 }
 366
 367 /**
 368  * bc_kern_dma_alloc - Allocate memory for Dma rings
 369  * @adp: Adapter instance
 370  * @sz: Size of the memory to allocate.
 371  * @phy_addr: Physical address of the memory allocated.
 372  *         Typedef to system's dma_addr_t (u64)
 373  *
 374  * Return:
 375  *  Pointer to allocated memory..
 376  *
 377  * Wrapper to Linux kernel interface.
 378  *
 379  */
 380 void *bc_kern_dma_alloc(struct crystalhd_adp *adp, uint32_t sz,
 381                         dma_addr_t *phy_addr)
 382 {
 383         void *temp = NULL;
 384
 385         if (!adp || !sz || !phy_addr) {
 386                 BCMLOG_ERR("Invalide Arg..\n");
 387                 return temp;
 388         }
 389
 390         temp = pci_alloc_consistent(adp->pdev, sz, phy_addr);
 391         if (temp)
 392                 memset(temp, 0, sz);
 393
 394         return temp;
 395 }
 396
 397 /**
 398  * bc_kern_dma_free - Release Dma ring memory.
 399  * @adp: Adapter instance
 400  * @sz: Size of the memory to allocate.
 401  * @ka: Kernel virtual address returned during _dio_alloc()
 402  * @phy_addr: Physical address of the memory allocated.
 403  *         Typedef to system's dma_addr_t (u64)
 404  *
 405  * Return:
 406  *     none.
 407  */
 408 void bc_kern_dma_free(struct crystalhd_adp *adp, uint32_t sz, void *ka,
 409                       dma_addr_t phy_addr)
 410 {
 411         if (!adp || !ka || !sz || !phy_addr) {
 412                 BCMLOG_ERR("Invalide Arg..\n");
 413                 return;
 414         }
 415
 416         pci_free_consistent(adp->pdev, sz, ka, phy_addr);
 417 }
 418
 419 /**
 420  * crystalhd_create_dioq - Create Generic DIO queue
 421  * @adp: Adapter instance
 422  * @dioq_hnd: Handle to the dio queue created
 423  * @cb  : Optional - Call back To free the element.
 424  * @cbctx: Context to pass to callback.
 425  *
 426  * Return:
 427  *  status
 428  *
 429  * Initialize Generic DIO queue to hold any data. Callback
 430  * will be used to free elements while deleting the queue.
 431  */
 432 enum BC_STATUS crystalhd_create_dioq(struct crystalhd_adp *adp,
 433                               struct crystalhd_dioq **dioq_hnd,
 434                               crystalhd_data_free_cb cb, void *cbctx)
 435 {
 436         struct crystalhd_dioq *dioq = NULL;
 437
 438         if (!adp || !dioq_hnd) {
 439                 BCMLOG_ERR("Invalid arg!!\n");
 440                 return BC_STS_INV_ARG;
 441         }
 442
 443         dioq = kzalloc(sizeof(*dioq), GFP_KERNEL);
 444         if (!dioq)
 445                 return BC_STS_INSUFF_RES;
 446
 447         spin_lock_init(&dioq->lock);
 448         dioq->sig = BC_LINK_DIOQ_SIG;
 449         dioq->head = (struct crystalhd_elem *)&dioq->head;
 450         dioq->tail = (struct crystalhd_elem *)&dioq->head;
 451         crystalhd_create_event(&dioq->event);
 452         dioq->adp = adp;
 453         dioq->data_rel_cb = cb;
 454         dioq->cb_context = cbctx;
 455         *dioq_hnd = dioq;
 456
 457         return BC_STS_SUCCESS;
 458 }
 459
 460 /**
 461  * crystalhd_delete_dioq - Delete Generic DIO queue
 462  * @adp: Adapter instance
 463  * @dioq: DIOQ instance..
 464  *
 465  * Return:
 466  *  None.
 467  *
 468  * Release Generic DIO queue. This function will remove
 469  * all the entries from the Queue and will release data
 470  * by calling the call back provided during creation.
 471  *
 472  */
 473 void crystalhd_delete_dioq(struct crystalhd_adp *adp, struct crystalhd_dioq *dioq)
 474 {
 475         void *temp;
 476
 477         if (!dioq || (dioq->sig != BC_LINK_DIOQ_SIG))
 478                 return;
 479
 480         do {
 481                 temp = crystalhd_dioq_fetch(dioq);
 482                 if (temp && dioq->data_rel_cb)
 483                         dioq->data_rel_cb(dioq->cb_context, temp);
 484         } while (temp);
 485         dioq->sig = 0;
 486         kfree(dioq);
 487 }
 488
 489 /**
 490  * crystalhd_dioq_add - Add new DIO request element.
 491  * @ioq: DIO queue instance
 492  * @t: DIO request to be added.
 493  * @wake: True - Wake up suspended process.
 494  * @tag: Special tag to assign - For search and get.
 495  *
 496  * Return:
 497  *  Status.
 498  *
 499  * Insert new element to Q tail.
 500  */
 501 enum BC_STATUS crystalhd_dioq_add(struct crystalhd_dioq *ioq, void *data,
 502                            bool wake, uint32_t tag)
 503 {
 504         unsigned long flags = 0;
 505         struct crystalhd_elem *tmp;
 506
 507         if (!ioq || (ioq->sig != BC_LINK_DIOQ_SIG) || !data) {
 508                 BCMLOG_ERR("Invalid arg!!\n");
 509                 return BC_STS_INV_ARG;
 510         }
 511
 512         tmp = crystalhd_alloc_elem(ioq->adp);
 513         if (!tmp) {
 514                 BCMLOG_ERR("No free elements.\n");
 515                 return BC_STS_INSUFF_RES;
 516         }
 517
 518         tmp->data = data;
 519         tmp->tag = tag;
 520         spin_lock_irqsave(&ioq->lock, flags);
 521         tmp->flink = (struct crystalhd_elem *)&ioq->head;
 522         tmp->blink = ioq->tail;
 523         tmp->flink->blink = tmp;
 524         tmp->blink->flink = tmp;
 525         ioq->count++;
 526         spin_unlock_irqrestore(&ioq->lock, flags);
 527
 528         if (wake)
 529                 crystalhd_set_event(&ioq->event);
 530
 531         return BC_STS_SUCCESS;
 532 }
 533
 534 /**
 535  * crystalhd_dioq_fetch - Fetch element from head.
 536  * @ioq: DIO queue instance
 537  *
 538  * Return:
 539  *      data element from the head..
 540  *
 541  * Remove an element from Queue.
 542  */
 543 void *crystalhd_dioq_fetch(struct crystalhd_dioq *ioq)
 544 {
 545         unsigned long flags = 0;
 546         struct crystalhd_elem *tmp;
 547         struct crystalhd_elem *ret = NULL;
 548         void *data = NULL;
 549
 550         if (!ioq || (ioq->sig != BC_LINK_DIOQ_SIG)) {
 551                 BCMLOG_ERR("Invalid arg!!\n");
 552                 return data;
 553         }
 554
 555         spin_lock_irqsave(&ioq->lock, flags);
 556         tmp = ioq->head;
 557         if (tmp != (struct crystalhd_elem *)&ioq->head) {
 558                 ret = tmp;
 559                 tmp->flink->blink = tmp->blink;
 560                 tmp->blink->flink = tmp->flink;
 561                 ioq->count--;
 562         }
 563         spin_unlock_irqrestore(&ioq->lock, flags);
 564         if (ret) {
 565                 data = ret->data;
 566                 crystalhd_free_elem(ioq->adp, ret);
 567         }
 568
 569         return data;
 570 }
 571 /**
 572  * crystalhd_dioq_find_and_fetch - Search the tag and Fetch element
 573  * @ioq: DIO queue instance
 574  * @tag: Tag to search for.
 575  *
 576  * Return:
 577  *      element from the head..
 578  *
 579  * Search TAG and remove the element.
 580  */
 581 void *crystalhd_dioq_find_and_fetch(struct crystalhd_dioq *ioq, uint32_t tag)
 582 {
 583         unsigned long flags = 0;
 584         struct crystalhd_elem *tmp;
 585         struct crystalhd_elem *ret = NULL;
 586         void *data = NULL;
 587
 588         if (!ioq || (ioq->sig != BC_LINK_DIOQ_SIG)) {
 589                 BCMLOG_ERR("Invalid arg!!\n");
 590                 return data;
 591         }
 592
 593         spin_lock_irqsave(&ioq->lock, flags);
 594         tmp = ioq->head;
 595         while (tmp != (struct crystalhd_elem *)&ioq->head) {
 596                 if (tmp->tag == tag) {
 597                         ret = tmp;
 598                         tmp->flink->blink = tmp->blink;
 599                         tmp->blink->flink = tmp->flink;
 600                         ioq->count--;
 601                         break;
 602                 }
 603                 tmp = tmp->flink;
 604         }
 605         spin_unlock_irqrestore(&ioq->lock, flags);
 606
 607         if (ret) {
 608                 data = ret->data;
 609                 crystalhd_free_elem(ioq->adp, ret);
 610         }
 611
 612         return data;
 613 }
 614
 615 /**
 616  * crystalhd_dioq_fetch_wait - Fetch element from Head.
 617  * @ioq: DIO queue instance
 618  * @to_secs: Wait timeout in seconds..
 619  *
 620  * Return:
 621  *      element from the head..
 622  *
 623  * Return element from head if Q is not empty. Wait for new element
 624  * if Q is empty for Timeout seconds.
 625  */
 626 void *crystalhd_dioq_fetch_wait(struct crystalhd_dioq *ioq, uint32_t to_secs,
 627                               uint32_t *sig_pend)
 628 {
 629         unsigned long flags = 0;
 630         int rc = 0, count;
 631         void *tmp = NULL;
 632
 633         if (!ioq || (ioq->sig != BC_LINK_DIOQ_SIG) || !to_secs || !sig_pend) {
 634                 BCMLOG_ERR("Invalid arg!!\n");
 635                 return tmp;
 636         }
 637
 638         count = to_secs;
 639         spin_lock_irqsave(&ioq->lock, flags);
 640         while ((ioq->count == 0) && count) {
 641                 spin_unlock_irqrestore(&ioq->lock, flags);
 642
 643                 crystalhd_wait_on_event(&ioq->event, (ioq->count > 0), 1000, rc, 0);
 644                 if (rc == 0) {
 645                         goto out;
 646                 } else if (rc == -EINTR) {
 647                         BCMLOG(BCMLOG_INFO, "Cancelling fetch wait\n");
 648                         *sig_pend = 1;
 649                         return tmp;
 650                 }
 651                 spin_lock_irqsave(&ioq->lock, flags);
 652                 count--;
 653         }
 654         spin_unlock_irqrestore(&ioq->lock, flags);
 655
 656 out:
 657         return crystalhd_dioq_fetch(ioq);
 658 }
 659
 660 /**
 661  * crystalhd_map_dio - Map user address for DMA
 662  * @adp:        Adapter instance
 663  * @ubuff:      User buffer to map.
 664  * @ubuff_sz:   User buffer size.
 665  * @uv_offset:  UV buffer offset.
 666  * @en_422mode: TRUE:422 FALSE:420 Capture mode.
 667  * @dir_tx:     TRUE for Tx (To device from host)
 668  * @dio_hnd:    Handle to mapped DIO request.
 669  *
 670  * Return:
 671  *      Status.
 672  *
 673  * This routine maps user address and lock pages for DMA.
 674  *
 675  */
 676 enum BC_STATUS crystalhd_map_dio(struct crystalhd_adp *adp, void *ubuff,
 677                           uint32_t ubuff_sz, uint32_t uv_offset,
 678                           bool en_422mode, bool dir_tx,
 679                           struct crystalhd_dio_req **dio_hnd)
 680 {
 681         struct crystalhd_dio_req        *dio;
 682         /* FIXME: jarod: should some of these unsigned longs be uint32_t or uintptr_t? */
 683         unsigned long start = 0, end = 0, uaddr = 0, count = 0;
 684         unsigned long spsz = 0, uv_start = 0;
 685         int i = 0, rw = 0, res = 0, nr_pages = 0, skip_fb_sg = 0;
 686
 687         if (!adp || !ubuff || !ubuff_sz || !dio_hnd) {
 688                 BCMLOG_ERR("Invalid arg\n");
 689                 return BC_STS_INV_ARG;
 690         }
 691         /* Compute pages */
 692         uaddr = (unsigned long)ubuff;
 693         count = (unsigned long)ubuff_sz;
 694         end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
 695         start = uaddr >> PAGE_SHIFT;
 696         nr_pages = end - start;
 697
 698         if (!count || ((uaddr + count) < uaddr)) {
 699                 BCMLOG_ERR("User addr overflow!!\n");
 700                 return BC_STS_INV_ARG;
 701         }
 702
 703         dio = crystalhd_alloc_dio(adp);
 704         if (!dio) {
 705                 BCMLOG_ERR("dio pool empty..\n");
 706                 return BC_STS_INSUFF_RES;
 707         }
 708
 709         if (dir_tx) {
 710                 rw = WRITE;
 711                 dio->direction = DMA_TO_DEVICE;
 712         } else {
 713                 rw = READ;
 714                 dio->direction = DMA_FROM_DEVICE;
 715         }
 716
 717         if (nr_pages > dio->max_pages) {
 718                 BCMLOG_ERR("max_pages(%d) exceeded(%d)!!\n",
 719                            dio->max_pages, nr_pages);
 720                 crystalhd_unmap_dio(adp, dio);
 721                 return BC_STS_INSUFF_RES;
 722         }
 723
 724         if (uv_offset) {
 725                 uv_start = (uaddr + (unsigned long)uv_offset)  >> PAGE_SHIFT;
 726                 dio->uinfo.uv_sg_ix = uv_start - start;
 727                 dio->uinfo.uv_sg_off = ((uaddr + (unsigned long)uv_offset) & ~PAGE_MASK);
 728         }
 729
 730         dio->fb_size = ubuff_sz & 0x03;
 731         if (dio->fb_size) {
 732                 res = copy_from_user(dio->fb_va,
 733                                      (void *)(uaddr + count - dio->fb_size),
 734                                      dio->fb_size);
 735                 if (res) {
 736                         BCMLOG_ERR("failed %d to copy %u fill bytes from %p\n",
 737                                    res, dio->fb_size,
 738                                    (void *)(uaddr + count-dio->fb_size));
 739                         crystalhd_unmap_dio(adp, dio);
 740                         return BC_STS_INSUFF_RES;
 741                 }
 742         }
 743
 744         down_read(&current->mm->mmap_sem);
 745         res = get_user_pages(current, current->mm, uaddr, nr_pages, rw == READ,
 746                              0, dio->pages, NULL);
 747         up_read(&current->mm->mmap_sem);
 748
 749         /* Save for release..*/
 750         dio->sig = crystalhd_dio_locked;
 751         if (res < nr_pages) {
 752                 BCMLOG_ERR("get pages failed: %d-%d\n", nr_pages, res);
 753                 dio->page_cnt = res;
 754                 crystalhd_unmap_dio(adp, dio);
 755                 return BC_STS_ERROR;
 756         }
 757
 758         dio->page_cnt = nr_pages;
 759         /* Get scatter/gather */
 760         crystalhd_init_sg(dio->sg, dio->page_cnt);
 761         crystalhd_set_sg(&dio->sg[0], dio->pages[0], 0, uaddr & ~PAGE_MASK);
 762         if (nr_pages > 1) {
 763                 dio->sg[0].length = PAGE_SIZE - dio->sg[0].offset;
 764
 765 #ifdef CONFIG_X86_64
 766                 dio->sg[0].dma_length = dio->sg[0].length;
 767 #endif
 768                 count -= dio->sg[0].length;
 769                 for (i = 1; i < nr_pages; i++) {
 770                         if (count < 4) {
 771                                 spsz = count;
 772                                 skip_fb_sg = 1;
 773                         } else {
 774                                 spsz = (count < PAGE_SIZE) ?
 775                                         (count & ~0x03) : PAGE_SIZE;
 776                         }
 777                         crystalhd_set_sg(&dio->sg[i], dio->pages[i], spsz, 0);
 778                         count -= spsz;
 779                 }
 780         } else {
 781                 if (count < 4) {
 782                         dio->sg[0].length = count;
 783                         skip_fb_sg = 1;
 784                 } else {
 785                         dio->sg[0].length = count - dio->fb_size;
 786                 }
 787 #ifdef CONFIG_X86_64
 788                 dio->sg[0].dma_length = dio->sg[0].length;
 789 #endif
 790         }
 791         dio->sg_cnt = pci_map_sg(adp->pdev, dio->sg,
 792                                  dio->page_cnt, dio->direction);
 793         if (dio->sg_cnt <= 0) {
 794                 BCMLOG_ERR("sg map %d-%d\n", dio->sg_cnt, dio->page_cnt);
 795                 crystalhd_unmap_dio(adp, dio);
 796                 return BC_STS_ERROR;
 797         }
 798         if (dio->sg_cnt && skip_fb_sg)
 799                 dio->sg_cnt -= 1;
 800         dio->sig = crystalhd_dio_sg_mapped;
 801         /* Fill in User info.. */
 802         dio->uinfo.xfr_len   = ubuff_sz;
 803         dio->uinfo.xfr_buff  = ubuff;
 804         dio->uinfo.uv_offset = uv_offset;
 805         dio->uinfo.b422mode  = en_422mode;
 806         dio->uinfo.dir_tx    = dir_tx;
 807
 808         *dio_hnd = dio;
 809
 810         return BC_STS_SUCCESS;
 811 }
 812
 813 /**
 814  * crystalhd_unmap_sgl - Release mapped resources
 815  * @adp: Adapter instance
 816  * @dio: DIO request instance
 817  *
 818  * Return:
 819  *      Status.
 820  *
 821  * This routine is to unmap the user buffer pages.
 822  */
 823 enum BC_STATUS crystalhd_unmap_dio(struct crystalhd_adp *adp, struct crystalhd_dio_req *dio)
 824 {
 825         struct page *page = NULL;
 826         int j = 0;
 827
 828         if (!adp || !dio) {
 829                 BCMLOG_ERR("Invalid arg\n");
 830                 return BC_STS_INV_ARG;
 831         }
 832
 833         if ((dio->page_cnt > 0) && (dio->sig != crystalhd_dio_inv)) {
 834                 for (j = 0; j < dio->page_cnt; j++) {
 835                         page = dio->pages[j];
 836                         if (page) {
 837                                 if (!PageReserved(page) &&
 838                                     (dio->direction == DMA_FROM_DEVICE))
 839                                         SetPageDirty(page);
 840                                 page_cache_release(page);
 841                         }
 842                 }
 843         }
 844         if (dio->sig == crystalhd_dio_sg_mapped)
 845                 pci_unmap_sg(adp->pdev, dio->sg, dio->page_cnt, dio->direction);
 846
 847         crystalhd_free_dio(adp, dio);
 848
 849         return BC_STS_SUCCESS;
 850 }
 851
 852 /**
 853  * crystalhd_create_dio_pool - Allocate mem pool for DIO management.
 854  * @adp: Adapter instance
 855  * @max_pages: Max pages for size calculation.
 856  *
 857  * Return:
 858  *      system error.
 859  *
 860  * This routine creates a memory pool to hold dio context for
 861  * for HW Direct IO operation.
 862  */
 863 int crystalhd_create_dio_pool(struct crystalhd_adp *adp, uint32_t max_pages)
 864 {
 865         uint32_t asz = 0, i = 0;
 866         uint8_t *temp;
 867         struct crystalhd_dio_req *dio;
 868
 869         if (!adp || !max_pages) {
 870                 BCMLOG_ERR("Invalid Arg!!\n");
 871                 return -EINVAL;
 872         }
 873
 874         /* Get dma memory for fill byte handling..*/
 875         adp->fill_byte_pool = pci_pool_create("crystalhd_fbyte",
 876                                               adp->pdev, 8, 8, 0);
 877         if (!adp->fill_byte_pool) {
 878                 BCMLOG_ERR("failed to create fill byte pool\n");
 879                 return -ENOMEM;
 880         }
 881
 882         /* Get the max size from user based on 420/422 modes */
 883         asz =  (sizeof(*dio->pages) * max_pages) +
 884                (sizeof(*dio->sg) * max_pages) + sizeof(*dio);
 885
 886         BCMLOG(BCMLOG_DBG, "Initializing Dio pool %d %d %x %p\n",
 887                BC_LINK_SG_POOL_SZ, max_pages, asz, adp->fill_byte_pool);
 888
 889         for (i = 0; i < BC_LINK_SG_POOL_SZ; i++) {
 890                 temp = kzalloc(asz, GFP_KERNEL);
 891                 if ((temp) == NULL) {
 892                         BCMLOG_ERR("Failed to alloc %d mem\n", asz);
 893                         return -ENOMEM;
 894                 }
 895
 896                 dio = (struct crystalhd_dio_req *)temp;
 897                 temp += sizeof(*dio);
 898                 dio->pages = (struct page **)temp;
 899                 temp += (sizeof(*dio->pages) * max_pages);
 900                 dio->sg = (struct scatterlist *)temp;
 901                 dio->max_pages = max_pages;
 902                 dio->fb_va = pci_pool_alloc(adp->fill_byte_pool, GFP_KERNEL,
 903                                             &dio->fb_pa);
 904                 if (!dio->fb_va) {
 905                         BCMLOG_ERR("fill byte alloc failed.\n");
 906                         return -ENOMEM;
 907                 }
 908
 909                 crystalhd_free_dio(adp, dio);
 910         }
 911
 912         return 0;
 913 }
 914
 915 /**
 916  * crystalhd_destroy_dio_pool - Release DIO mem pool.
 917  * @adp: Adapter instance
 918  *
 919  * Return:
 920  *      none.
 921  *
 922  * This routine releases dio memory pool during close.
 923  */
 924 void crystalhd_destroy_dio_pool(struct crystalhd_adp *adp)
 925 {
 926         struct crystalhd_dio_req *dio;
 927         int count = 0;
 928
 929         if (!adp) {
 930                 BCMLOG_ERR("Invalid Arg!!\n");
 931                 return;
 932         }
 933
 934         do {
 935                 dio = crystalhd_alloc_dio(adp);
 936                 if (dio) {
 937                         if (dio->fb_va)
 938                                 pci_pool_free(adp->fill_byte_pool,
 939                                               dio->fb_va, dio->fb_pa);
 940                         count++;
 941                         kfree(dio);
 942                 }
 943         } while (dio);
 944
 945         if (adp->fill_byte_pool) {
 946                 pci_pool_destroy(adp->fill_byte_pool);
 947                 adp->fill_byte_pool = NULL;
 948         }
 949
 950         BCMLOG(BCMLOG_DBG, "Released dio pool %d\n", count);
 951 }
 952
 953 /**
 954  * crystalhd_create_elem_pool - List element pool creation.
 955  * @adp: Adapter instance
 956  * @pool_size: Number of elements in the pool.
 957  *
 958  * Return:
 959  *      0 - success, <0 error
 960  *
 961  * Create general purpose list element pool to hold pending,
 962  * and active requests.
 963  */
 964 int __devinit crystalhd_create_elem_pool(struct crystalhd_adp *adp,
 965                 uint32_t pool_size)
 966 {
 967         uint32_t i;
 968         struct crystalhd_elem *temp;
 969
 970         if (!adp || !pool_size)
 971                 return -EINVAL;
 972
 973         for (i = 0; i < pool_size; i++) {
 974                 temp = kzalloc(sizeof(*temp), GFP_KERNEL);
 975                 if (!temp) {
 976                         BCMLOG_ERR("kalloc failed\n");
 977                         return -ENOMEM;
 978                 }
 979                 crystalhd_free_elem(adp, temp);
 980         }
 981         BCMLOG(BCMLOG_DBG, "allocated %d elem\n", pool_size);
 982         return 0;
 983 }
 984
 985 /**
 986  * crystalhd_delete_elem_pool - List element pool deletion.
 987  * @adp: Adapter instance
 988  *
 989  * Return:
 990  *      none
 991  *
 992  * Delete general purpose list element pool.
 993  */
 994 void crystalhd_delete_elem_pool(struct crystalhd_adp *adp)
 995 {
 996         struct crystalhd_elem *temp;
 997         int dbg_cnt = 0;
 998
 999         if (!adp)
1000                 return;
1001
1002         do {
1003                 temp = crystalhd_alloc_elem(adp);
1004                 if (temp) {
1005                         kfree(temp);
1006                         dbg_cnt++;
1007                 }
1008         } while (temp);
1009
1010         BCMLOG(BCMLOG_DBG, "released %d elem\n", dbg_cnt);
1011 }
1012
1013 /*================ Debug support routines.. ================================*/
1014 void crystalhd_show_buffer(uint32_t off, uint8_t *buff, uint32_t dwcount)
1015 {
1016         uint32_t i, k = 1;
1017
1018         for (i = 0; i < dwcount; i++) {
1019                 if (k == 1)
1020                         BCMLOG(BCMLOG_DATA, "0x%08X : ", off);
1021
1022                 BCMLOG(BCMLOG_DATA, " 0x%08X ", *((uint32_t *)buff));
1023
1024                 buff += sizeof(uint32_t);
1025                 off  += sizeof(uint32_t);
1026                 k++;
1027                 if ((i == dwcount - 1) || (k > 4)) {
1028                         BCMLOG(BCMLOG_DATA, "\n");
1029                         k = 1;
1030                 }
1031         }
1032 }