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   1 /*
   2  *  linux/arch/arm/mach-pnx4008/dma.c
   3  *
   4  *  PNX4008 DMA registration and IRQ dispatching
   5  *
   6  *  Author:     Vitaly Wool
   7  *  Copyright:  MontaVista Software Inc. (c) 2005
   8  *
   9  *  Based on the code from Nicolas Pitre
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/clk.h>
  24
  25 #include <asm/system.h>
  26 #include <asm/hardware.h>
  27 #include <asm/dma.h>
  28 #include <asm/dma-mapping.h>
  29 #include <asm/io.h>
  30 #include <asm/mach/dma.h>
  31 #include <asm/arch/clock.h>
  32
  33 static struct dma_channel {
  34         char *name;
  35         void (*irq_handler) (int, int, void *);
  36         void *data;
  37         struct pnx4008_dma_ll *ll;
  38         u32 ll_dma;
  39         void *target_addr;
  40         int target_id;
  41 } dma_channels[MAX_DMA_CHANNELS];
  42
  43 static struct ll_pool {
  44         void *vaddr;
  45         void *cur;
  46         dma_addr_t dma_addr;
  47         int count;
  48 } ll_pool;
  49
  50 static DEFINE_SPINLOCK(ll_lock);
  51
  52 struct pnx4008_dma_ll *pnx4008_alloc_ll_entry(dma_addr_t * ll_dma)
  53 {
  54         struct pnx4008_dma_ll *ll = NULL;
  55         unsigned long flags;
  56
  57         spin_lock_irqsave(&ll_lock, flags);
  58         if (ll_pool.count > 4) { /* can give one more */
  59                 ll = *(struct pnx4008_dma_ll **) ll_pool.cur;
  60                 *ll_dma = ll_pool.dma_addr + ((void *)ll - ll_pool.vaddr);
  61                 *(void **)ll_pool.cur = **(void ***)ll_pool.cur;
  62                 memset(ll, 0, sizeof(*ll));
  63                 ll_pool.count--;
  64         }
  65         spin_unlock_irqrestore(&ll_lock, flags);
  66
  67         return ll;
  68 }
  69
  70 EXPORT_SYMBOL_GPL(pnx4008_alloc_ll_entry);
  71
  72 void pnx4008_free_ll_entry(struct pnx4008_dma_ll * ll, dma_addr_t ll_dma)
  73 {
  74         unsigned long flags;
  75
  76         if (ll) {
  77                 if ((unsigned long)((long)ll - (long)ll_pool.vaddr) > 0x4000) {
  78                         printk(KERN_ERR "Trying to free entry not allocated by DMA\n");
  79                         BUG();
  80                 }
  81
  82                 if (ll->flags & DMA_BUFFER_ALLOCATED)
  83                         ll->free(ll->alloc_data);
  84
  85                 spin_lock_irqsave(&ll_lock, flags);
  86                 *(long *)ll = *(long *)ll_pool.cur;
  87                 *(long *)ll_pool.cur = (long)ll;
  88                 ll_pool.count++;
  89                 spin_unlock_irqrestore(&ll_lock, flags);
  90         }
  91 }
  92
  93 EXPORT_SYMBOL_GPL(pnx4008_free_ll_entry);
  94
  95 void pnx4008_free_ll(u32 ll_dma, struct pnx4008_dma_ll * ll)
  96 {
  97         struct pnx4008_dma_ll *ptr;
  98         u32 dma;
  99
 100         while (ll) {
 101                 dma = ll->next_dma;
 102                 ptr = ll->next;
 103                 pnx4008_free_ll_entry(ll, ll_dma);
 104
 105                 ll_dma = dma;
 106                 ll = ptr;
 107         }
 108 }
 109
 110 EXPORT_SYMBOL_GPL(pnx4008_free_ll);
 111
 112 static int dma_channels_requested = 0;
 113
 114 static inline void dma_increment_usage(void)
 115 {
 116         if (!dma_channels_requested++) {
 117                 struct clk *clk = clk_get(0, "dma_ck");
 118                 if (!IS_ERR(clk)) {
 119                         clk_set_rate(clk, 1);
 120                         clk_put(clk);
 121                 }
 122                 pnx4008_config_dma(-1, -1, 1);
 123         }
 124 }
 125 static inline void dma_decrement_usage(void)
 126 {
 127         if (!--dma_channels_requested) {
 128                 struct clk *clk = clk_get(0, "dma_ck");
 129                 if (!IS_ERR(clk)) {
 130                         clk_set_rate(clk, 0);
 131                         clk_put(clk);
 132                 }
 133                 pnx4008_config_dma(-1, -1, 0);
 134
 135         }
 136 }
 137
 138 static DEFINE_SPINLOCK(dma_lock);
 139
 140 static inline void pnx4008_dma_lock(void)
 141 {
 142         spin_lock_irq(&dma_lock);
 143 }
 144
 145 static inline void pnx4008_dma_unlock(void)
 146 {
 147         spin_unlock_irq(&dma_lock);
 148 }
 149
 150 #define VALID_CHANNEL(c)        (((c) >= 0) && ((c) < MAX_DMA_CHANNELS))
 151
 152 int pnx4008_request_channel(char *name, int ch,
 153                             void (*irq_handler) (int, int, void *), void *data)
 154 {
 155         int i, found = 0;
 156
 157         /* basic sanity checks */
 158         if (!name || (ch != -1 && !VALID_CHANNEL(ch)))
 159                 return -EINVAL;
 160
 161         pnx4008_dma_lock();
 162
 163         /* try grabbing a DMA channel with the requested priority */
 164         for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
 165                 if (!dma_channels[i].name && (ch == -1 || ch == i)) {
 166                         found = 1;
 167                         break;
 168                 }
 169         }
 170
 171         if (found) {
 172                 dma_increment_usage();
 173                 dma_channels[i].name = name;
 174                 dma_channels[i].irq_handler = irq_handler;
 175                 dma_channels[i].data = data;
 176                 dma_channels[i].ll = NULL;
 177                 dma_channels[i].ll_dma = 0;
 178         } else {
 179                 printk(KERN_WARNING "No more available DMA channels for %s\n",
 180                        name);
 181                 i = -ENODEV;
 182         }
 183
 184         pnx4008_dma_unlock();
 185         return i;
 186 }
 187
 188 EXPORT_SYMBOL_GPL(pnx4008_request_channel);
 189
 190 void pnx4008_free_channel(int ch)
 191 {
 192         if (!dma_channels[ch].name) {
 193                 printk(KERN_CRIT
 194                        "%s: trying to free channel %d which is already freed\n",
 195                        __func__, ch);
 196                 return;
 197         }
 198
 199         pnx4008_dma_lock();
 200         pnx4008_free_ll(dma_channels[ch].ll_dma, dma_channels[ch].ll);
 201         dma_channels[ch].ll = NULL;
 202         dma_decrement_usage();
 203
 204         dma_channels[ch].name = NULL;
 205         pnx4008_dma_unlock();
 206 }
 207
 208 EXPORT_SYMBOL_GPL(pnx4008_free_channel);
 209
 210 int pnx4008_config_dma(int ahb_m1_be, int ahb_m2_be, int enable)
 211 {
 212         unsigned long dma_cfg = __raw_readl(DMAC_CONFIG);
 213
 214         switch (ahb_m1_be) {
 215         case 0:
 216                 dma_cfg &= ~(1 << 1);
 217                 break;
 218         case 1:
 219                 dma_cfg |= (1 << 1);
 220                 break;
 221         default:
 222                 break;
 223         }
 224
 225         switch (ahb_m2_be) {
 226         case 0:
 227                 dma_cfg &= ~(1 << 2);
 228                 break;
 229         case 1:
 230                 dma_cfg |= (1 << 2);
 231                 break;
 232         default:
 233                 break;
 234         }
 235
 236         switch (enable) {
 237         case 0:
 238                 dma_cfg &= ~(1 << 0);
 239                 break;
 240         case 1:
 241                 dma_cfg |= (1 << 0);
 242                 break;
 243         default:
 244                 break;
 245         }
 246
 247         pnx4008_dma_lock();
 248         __raw_writel(dma_cfg, DMAC_CONFIG);
 249         pnx4008_dma_unlock();
 250
 251         return 0;
 252 }
 253
 254 EXPORT_SYMBOL_GPL(pnx4008_config_dma);
 255
 256 int pnx4008_dma_pack_control(const struct pnx4008_dma_ch_ctrl * ch_ctrl,
 257                              unsigned long *ctrl)
 258 {
 259         int i = 0, dbsize, sbsize, err = 0;
 260
 261         if (!ctrl || !ch_ctrl) {
 262                 err = -EINVAL;
 263                 goto out;
 264         }
 265
 266         *ctrl = 0;
 267
 268         switch (ch_ctrl->tc_mask) {
 269         case 0:
 270                 break;
 271         case 1:
 272                 *ctrl |= (1 << 31);
 273                 break;
 274
 275         default:
 276                 err = -EINVAL;
 277                 goto out;
 278         }
 279
 280         switch (ch_ctrl->cacheable) {
 281         case 0:
 282                 break;
 283         case 1:
 284                 *ctrl |= (1 << 30);
 285                 break;
 286
 287         default:
 288                 err = -EINVAL;
 289                 goto out;
 290         }
 291         switch (ch_ctrl->bufferable) {
 292         case 0:
 293                 break;
 294         case 1:
 295                 *ctrl |= (1 << 29);
 296                 break;
 297
 298         default:
 299                 err = -EINVAL;
 300                 goto out;
 301         }
 302         switch (ch_ctrl->priv_mode) {
 303         case 0:
 304                 break;
 305         case 1:
 306                 *ctrl |= (1 << 28);
 307                 break;
 308
 309         default:
 310                 err = -EINVAL;
 311                 goto out;
 312         }
 313         switch (ch_ctrl->di) {
 314         case 0:
 315                 break;
 316         case 1:
 317                 *ctrl |= (1 << 27);
 318                 break;
 319
 320         default:
 321                 err = -EINVAL;
 322                 goto out;
 323         }
 324         switch (ch_ctrl->si) {
 325         case 0:
 326                 break;
 327         case 1:
 328                 *ctrl |= (1 << 26);
 329                 break;
 330
 331         default:
 332                 err = -EINVAL;
 333                 goto out;
 334         }
 335         switch (ch_ctrl->dest_ahb1) {
 336         case 0:
 337                 break;
 338         case 1:
 339                 *ctrl |= (1 << 25);
 340                 break;
 341
 342         default:
 343                 err = -EINVAL;
 344                 goto out;
 345         }
 346         switch (ch_ctrl->src_ahb1) {
 347         case 0:
 348                 break;
 349         case 1:
 350                 *ctrl |= (1 << 24);
 351                 break;
 352
 353         default:
 354                 err = -EINVAL;
 355                 goto out;
 356         }
 357         switch (ch_ctrl->dwidth) {
 358         case WIDTH_BYTE:
 359                 *ctrl &= ~(7 << 21);
 360                 break;
 361         case WIDTH_HWORD:
 362                 *ctrl &= ~(7 << 21);
 363                 *ctrl |= (1 << 21);
 364                 break;
 365         case WIDTH_WORD:
 366                 *ctrl &= ~(7 << 21);
 367                 *ctrl |= (2 << 21);
 368                 break;
 369
 370         default:
 371                 err = -EINVAL;
 372                 goto out;
 373         }
 374         switch (ch_ctrl->swidth) {
 375         case WIDTH_BYTE:
 376                 *ctrl &= ~(7 << 18);
 377                 break;
 378         case WIDTH_HWORD:
 379                 *ctrl &= ~(7 << 18);
 380                 *ctrl |= (1 << 18);
 381                 break;
 382         case WIDTH_WORD:
 383                 *ctrl &= ~(7 << 18);
 384                 *ctrl |= (2 << 18);
 385                 break;
 386
 387         default:
 388                 err = -EINVAL;
 389                 goto out;
 390         }
 391         dbsize = ch_ctrl->dbsize;
 392         while (!(dbsize & 1)) {
 393                 i++;
 394                 dbsize >>= 1;
 395         }
 396         if (ch_ctrl->dbsize != 1 || i > 8 || i == 1) {
 397                 err = -EINVAL;
 398                 goto out;
 399         } else if (i > 1)
 400                 i--;
 401         *ctrl &= ~(7 << 15);
 402         *ctrl |= (i << 15);
 403
 404         sbsize = ch_ctrl->sbsize;
 405         while (!(sbsize & 1)) {
 406                 i++;
 407                 sbsize >>= 1;
 408         }
 409         if (ch_ctrl->sbsize != 1 || i > 8 || i == 1) {
 410                 err = -EINVAL;
 411                 goto out;
 412         } else if (i > 1)
 413                 i--;
 414         *ctrl &= ~(7 << 12);
 415         *ctrl |= (i << 12);
 416
 417         if (ch_ctrl->tr_size > 0x7ff) {
 418                 err = -E2BIG;
 419                 goto out;
 420         }
 421         *ctrl &= ~0x7ff;
 422         *ctrl |= ch_ctrl->tr_size & 0x7ff;
 423
 424 out:
 425         return err;
 426 }
 427
 428 EXPORT_SYMBOL_GPL(pnx4008_dma_pack_control);
 429
 430 int pnx4008_dma_parse_control(unsigned long ctrl,
 431                               struct pnx4008_dma_ch_ctrl * ch_ctrl)
 432 {
 433         int err = 0;
 434
 435         if (!ch_ctrl) {
 436                 err = -EINVAL;
 437                 goto out;
 438         }
 439
 440         ch_ctrl->tr_size = ctrl & 0x7ff;
 441         ctrl >>= 12;
 442
 443         ch_ctrl->sbsize = 1 << (ctrl & 7);
 444         if (ch_ctrl->sbsize > 1)
 445                 ch_ctrl->sbsize <<= 1;
 446         ctrl >>= 3;
 447
 448         ch_ctrl->dbsize = 1 << (ctrl & 7);
 449         if (ch_ctrl->dbsize > 1)
 450                 ch_ctrl->dbsize <<= 1;
 451         ctrl >>= 3;
 452
 453         switch (ctrl & 7) {
 454         case 0:
 455                 ch_ctrl->swidth = WIDTH_BYTE;
 456                 break;
 457         case 1:
 458                 ch_ctrl->swidth = WIDTH_HWORD;
 459                 break;
 460         case 2:
 461                 ch_ctrl->swidth = WIDTH_WORD;
 462                 break;
 463         default:
 464                 err = -EINVAL;
 465                 goto out;
 466         }
 467         ctrl >>= 3;
 468
 469         switch (ctrl & 7) {
 470         case 0:
 471                 ch_ctrl->dwidth = WIDTH_BYTE;
 472                 break;
 473         case 1:
 474                 ch_ctrl->dwidth = WIDTH_HWORD;
 475                 break;
 476         case 2:
 477                 ch_ctrl->dwidth = WIDTH_WORD;
 478                 break;
 479         default:
 480                 err = -EINVAL;
 481                 goto out;
 482         }
 483         ctrl >>= 3;
 484
 485         ch_ctrl->src_ahb1 = ctrl & 1;
 486         ctrl >>= 1;
 487
 488         ch_ctrl->dest_ahb1 = ctrl & 1;
 489         ctrl >>= 1;
 490
 491         ch_ctrl->si = ctrl & 1;
 492         ctrl >>= 1;
 493
 494         ch_ctrl->di = ctrl & 1;
 495         ctrl >>= 1;
 496
 497         ch_ctrl->priv_mode = ctrl & 1;
 498         ctrl >>= 1;
 499
 500         ch_ctrl->bufferable = ctrl & 1;
 501         ctrl >>= 1;
 502
 503         ch_ctrl->cacheable = ctrl & 1;
 504         ctrl >>= 1;
 505
 506         ch_ctrl->tc_mask = ctrl & 1;
 507
 508 out:
 509         return err;
 510 }
 511
 512 EXPORT_SYMBOL_GPL(pnx4008_dma_parse_control);
 513
 514 int pnx4008_dma_pack_config(const struct pnx4008_dma_ch_config * ch_cfg,
 515                             unsigned long *cfg)
 516 {
 517         int err = 0;
 518
 519         if (!cfg || !ch_cfg) {
 520                 err = -EINVAL;
 521                 goto out;
 522         }
 523
 524         *cfg = 0;
 525
 526         switch (ch_cfg->halt) {
 527         case 0:
 528                 break;
 529         case 1:
 530                 *cfg |= (1 << 18);
 531                 break;
 532
 533         default:
 534                 err = -EINVAL;
 535                 goto out;
 536         }
 537         switch (ch_cfg->active) {
 538         case 0:
 539                 break;
 540         case 1:
 541                 *cfg |= (1 << 17);
 542                 break;
 543
 544         default:
 545                 err = -EINVAL;
 546                 goto out;
 547         }
 548         switch (ch_cfg->lock) {
 549         case 0:
 550                 break;
 551         case 1:
 552                 *cfg |= (1 << 16);
 553                 break;
 554
 555         default:
 556                 err = -EINVAL;
 557                 goto out;
 558         }
 559         switch (ch_cfg->itc) {
 560         case 0:
 561                 break;
 562         case 1:
 563                 *cfg |= (1 << 15);
 564                 break;
 565
 566         default:
 567                 err = -EINVAL;
 568                 goto out;
 569         }
 570         switch (ch_cfg->ie) {
 571         case 0:
 572                 break;
 573         case 1:
 574                 *cfg |= (1 << 14);
 575                 break;
 576
 577         default:
 578                 err = -EINVAL;
 579                 goto out;
 580         }
 581         switch (ch_cfg->flow_cntrl) {
 582         case FC_MEM2MEM_DMA:
 583                 *cfg &= ~(7 << 11);
 584                 break;
 585         case FC_MEM2PER_DMA:
 586                 *cfg &= ~(7 << 11);
 587                 *cfg |= (1 << 11);
 588                 break;
 589         case FC_PER2MEM_DMA:
 590                 *cfg &= ~(7 << 11);
 591                 *cfg |= (2 << 11);
 592                 break;
 593         case FC_PER2PER_DMA:
 594                 *cfg &= ~(7 << 11);
 595                 *cfg |= (3 << 11);
 596                 break;
 597         case FC_PER2PER_DPER:
 598                 *cfg &= ~(7 << 11);
 599                 *cfg |= (4 << 11);
 600                 break;
 601         case FC_MEM2PER_PER:
 602                 *cfg &= ~(7 << 11);
 603                 *cfg |= (5 << 11);
 604                 break;
 605         case FC_PER2MEM_PER:
 606                 *cfg &= ~(7 << 11);
 607                 *cfg |= (6 << 11);
 608                 break;
 609         case FC_PER2PER_SPER:
 610                 *cfg |= (7 << 11);
 611                 break;
 612
 613         default:
 614                 err = -EINVAL;
 615                 goto out;
 616         }
 617         *cfg &= ~(0x1f << 6);
 618         *cfg |= ((ch_cfg->dest_per & 0x1f) << 6);
 619
 620         *cfg &= ~(0x1f << 1);
 621         *cfg |= ((ch_cfg->src_per & 0x1f) << 1);
 622
 623 out:
 624         return err;
 625 }
 626
 627 EXPORT_SYMBOL_GPL(pnx4008_dma_pack_config);
 628
 629 int pnx4008_dma_parse_config(unsigned long cfg,
 630                              struct pnx4008_dma_ch_config * ch_cfg)
 631 {
 632         int err = 0;
 633
 634         if (!ch_cfg) {
 635                 err = -EINVAL;
 636                 goto out;
 637         }
 638
 639         cfg >>= 1;
 640
 641         ch_cfg->src_per = cfg & 0x1f;
 642         cfg >>= 5;
 643
 644         ch_cfg->dest_per = cfg & 0x1f;
 645         cfg >>= 5;
 646
 647         switch (cfg & 7) {
 648         case 0:
 649                 ch_cfg->flow_cntrl = FC_MEM2MEM_DMA;
 650                 break;
 651         case 1:
 652                 ch_cfg->flow_cntrl = FC_MEM2PER_DMA;
 653                 break;
 654         case 2:
 655                 ch_cfg->flow_cntrl = FC_PER2MEM_DMA;
 656                 break;
 657         case 3:
 658                 ch_cfg->flow_cntrl = FC_PER2PER_DMA;
 659                 break;
 660         case 4:
 661                 ch_cfg->flow_cntrl = FC_PER2PER_DPER;
 662                 break;
 663         case 5:
 664                 ch_cfg->flow_cntrl = FC_MEM2PER_PER;
 665                 break;
 666         case 6:
 667                 ch_cfg->flow_cntrl = FC_PER2MEM_PER;
 668                 break;
 669         case 7:
 670                 ch_cfg->flow_cntrl = FC_PER2PER_SPER;
 671         }
 672         cfg >>= 3;
 673
 674         ch_cfg->ie = cfg & 1;
 675         cfg >>= 1;
 676
 677         ch_cfg->itc = cfg & 1;
 678         cfg >>= 1;
 679
 680         ch_cfg->lock = cfg & 1;
 681         cfg >>= 1;
 682
 683         ch_cfg->active = cfg & 1;
 684         cfg >>= 1;
 685
 686         ch_cfg->halt = cfg & 1;
 687
 688 out:
 689         return err;
 690 }
 691
 692 EXPORT_SYMBOL_GPL(pnx4008_dma_parse_config);
 693
 694 void pnx4008_dma_split_head_entry(struct pnx4008_dma_config * config,
 695                                   struct pnx4008_dma_ch_ctrl * ctrl)
 696 {
 697         int new_len = ctrl->tr_size, num_entries = 0;
 698         int old_len = new_len;
 699         int src_width, dest_width, count = 1;
 700
 701         switch (ctrl->swidth) {
 702         case WIDTH_BYTE:
 703                 src_width = 1;
 704                 break;
 705         case WIDTH_HWORD:
 706                 src_width = 2;
 707                 break;
 708         case WIDTH_WORD:
 709                 src_width = 4;
 710                 break;
 711         default:
 712                 return;
 713         }
 714
 715         switch (ctrl->dwidth) {
 716         case WIDTH_BYTE:
 717                 dest_width = 1;
 718                 break;
 719         case WIDTH_HWORD:
 720                 dest_width = 2;
 721                 break;
 722         case WIDTH_WORD:
 723                 dest_width = 4;
 724                 break;
 725         default:
 726                 return;
 727         }
 728
 729         while (new_len > 0x7FF) {
 730                 num_entries++;
 731                 new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
 732         }
 733         if (num_entries != 0) {
 734                 struct pnx4008_dma_ll *ll = NULL;
 735                 config->ch_ctrl &= ~0x7ff;
 736                 config->ch_ctrl |= new_len;
 737                 if (!config->is_ll) {
 738                         config->is_ll = 1;
 739                         while (num_entries) {
 740                                 if (!ll) {
 741                                         config->ll =
 742                                             pnx4008_alloc_ll_entry(&config->
 743                                                                    ll_dma);
 744                                         ll = config->ll;
 745                                 } else {
 746                                         ll->next =
 747                                             pnx4008_alloc_ll_entry(&ll->
 748                                                                    next_dma);
 749                                         ll = ll->next;
 750                                 }
 751
 752                                 if (ctrl->si)
 753                                         ll->src_addr =
 754                                             config->src_addr +
 755                                             src_width * new_len * count;
 756                                 else
 757                                         ll->src_addr = config->src_addr;
 758                                 if (ctrl->di)
 759                                         ll->dest_addr =
 760                                             config->dest_addr +
 761                                             dest_width * new_len * count;
 762                                 else
 763                                         ll->dest_addr = config->dest_addr;
 764                                 ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
 765                                 ll->next_dma = 0;
 766                                 ll->next = NULL;
 767                                 num_entries--;
 768                                 count++;
 769                         }
 770                 } else {
 771                         struct pnx4008_dma_ll *ll_old = config->ll;
 772                         unsigned long ll_dma_old = config->ll_dma;
 773                         while (num_entries) {
 774                                 if (!ll) {
 775                                         config->ll =
 776                                             pnx4008_alloc_ll_entry(&config->
 777                                                                    ll_dma);
 778                                         ll = config->ll;
 779                                 } else {
 780                                         ll->next =
 781                                             pnx4008_alloc_ll_entry(&ll->
 782                                                                    next_dma);
 783                                         ll = ll->next;
 784                                 }
 785
 786                                 if (ctrl->si)
 787                                         ll->src_addr =
 788                                             config->src_addr +
 789                                             src_width * new_len * count;
 790                                 else
 791                                         ll->src_addr = config->src_addr;
 792                                 if (ctrl->di)
 793                                         ll->dest_addr =
 794                                             config->dest_addr +
 795                                             dest_width * new_len * count;
 796                                 else
 797                                         ll->dest_addr = config->dest_addr;
 798                                 ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
 799                                 ll->next_dma = 0;
 800                                 ll->next = NULL;
 801                                 num_entries--;
 802                                 count++;
 803                         }
 804                         ll->next_dma = ll_dma_old;
 805                         ll->next = ll_old;
 806                 }
 807                 /* adjust last length/tc */
 808                 ll->ch_ctrl = config->ch_ctrl & (~0x7ff);
 809                 ll->ch_ctrl |= old_len - new_len * (count - 1);
 810                 config->ch_ctrl &= 0x7fffffff;
 811         }
 812 }
 813
 814 EXPORT_SYMBOL_GPL(pnx4008_dma_split_head_entry);
 815
 816 void pnx4008_dma_split_ll_entry(struct pnx4008_dma_ll * cur_ll,
 817                                 struct pnx4008_dma_ch_ctrl * ctrl)
 818 {
 819         int new_len = ctrl->tr_size, num_entries = 0;
 820         int old_len = new_len;
 821         int src_width, dest_width, count = 1;
 822
 823         switch (ctrl->swidth) {
 824         case WIDTH_BYTE:
 825                 src_width = 1;
 826                 break;
 827         case WIDTH_HWORD:
 828                 src_width = 2;
 829                 break;
 830         case WIDTH_WORD:
 831                 src_width = 4;
 832                 break;
 833         default:
 834                 return;
 835         }
 836
 837         switch (ctrl->dwidth) {
 838         case WIDTH_BYTE:
 839                 dest_width = 1;
 840                 break;
 841         case WIDTH_HWORD:
 842                 dest_width = 2;
 843                 break;
 844         case WIDTH_WORD:
 845                 dest_width = 4;
 846                 break;
 847         default:
 848                 return;
 849         }
 850
 851         while (new_len > 0x7FF) {
 852                 num_entries++;
 853                 new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
 854         }
 855         if (num_entries != 0) {
 856                 struct pnx4008_dma_ll *ll = NULL;
 857                 cur_ll->ch_ctrl &= ~0x7ff;
 858                 cur_ll->ch_ctrl |= new_len;
 859                 if (!cur_ll->next) {
 860                         while (num_entries) {
 861                                 if (!ll) {
 862                                         cur_ll->next =
 863                                             pnx4008_alloc_ll_entry(&cur_ll->
 864                                                                    next_dma);
 865                                         ll = cur_ll->next;
 866                                 } else {
 867                                         ll->next =
 868                                             pnx4008_alloc_ll_entry(&ll->
 869                                                                    next_dma);
 870                                         ll = ll->next;
 871                                 }
 872
 873                                 if (ctrl->si)
 874                                         ll->src_addr =
 875                                             cur_ll->src_addr +
 876                                             src_width * new_len * count;
 877                                 else
 878                                         ll->src_addr = cur_ll->src_addr;
 879                                 if (ctrl->di)
 880                                         ll->dest_addr =
 881                                             cur_ll->dest_addr +
 882                                             dest_width * new_len * count;
 883                                 else
 884                                         ll->dest_addr = cur_ll->dest_addr;
 885                                 ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
 886                                 ll->next_dma = 0;
 887                                 ll->next = NULL;
 888                                 num_entries--;
 889                                 count++;
 890                         }
 891                 } else {
 892                         struct pnx4008_dma_ll *ll_old = cur_ll->next;
 893                         unsigned long ll_dma_old = cur_ll->next_dma;
 894                         while (num_entries) {
 895                                 if (!ll) {
 896                                         cur_ll->next =
 897                                             pnx4008_alloc_ll_entry(&cur_ll->
 898                                                                    next_dma);
 899                                         ll = cur_ll->next;
 900                                 } else {
 901                                         ll->next =
 902                                             pnx4008_alloc_ll_entry(&ll->
 903                                                                    next_dma);
 904                                         ll = ll->next;
 905                                 }
 906
 907                                 if (ctrl->si)
 908                                         ll->src_addr =
 909                                             cur_ll->src_addr +
 910                                             src_width * new_len * count;
 911                                 else
 912                                         ll->src_addr = cur_ll->src_addr;
 913                                 if (ctrl->di)
 914                                         ll->dest_addr =
 915                                             cur_ll->dest_addr +
 916                                             dest_width * new_len * count;
 917                                 else
 918                                         ll->dest_addr = cur_ll->dest_addr;
 919                                 ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
 920                                 ll->next_dma = 0;
 921                                 ll->next = NULL;
 922                                 num_entries--;
 923                                 count++;
 924                         }
 925
 926                         ll->next_dma = ll_dma_old;
 927                         ll->next = ll_old;
 928                 }
 929                 /* adjust last length/tc */
 930                 ll->ch_ctrl = cur_ll->ch_ctrl & (~0x7ff);
 931                 ll->ch_ctrl |= old_len - new_len * (count - 1);
 932                 cur_ll->ch_ctrl &= 0x7fffffff;
 933         }
 934 }
 935
 936 EXPORT_SYMBOL_GPL(pnx4008_dma_split_ll_entry);
 937
 938 int pnx4008_config_channel(int ch, struct pnx4008_dma_config * config)
 939 {
 940         if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
 941                 return -EINVAL;
 942
 943         pnx4008_dma_lock();
 944         __raw_writel(config->src_addr, DMAC_Cx_SRC_ADDR(ch));
 945         __raw_writel(config->dest_addr, DMAC_Cx_DEST_ADDR(ch));
 946
 947         if (config->is_ll)
 948                 __raw_writel(config->ll_dma, DMAC_Cx_LLI(ch));
 949         else
 950                 __raw_writel(0, DMAC_Cx_LLI(ch));
 951
 952         __raw_writel(config->ch_ctrl, DMAC_Cx_CONTROL(ch));
 953         __raw_writel(config->ch_cfg, DMAC_Cx_CONFIG(ch));
 954         pnx4008_dma_unlock();
 955
 956         return 0;
 957
 958 }
 959
 960 EXPORT_SYMBOL_GPL(pnx4008_config_channel);
 961
 962 int pnx4008_channel_get_config(int ch, struct pnx4008_dma_config * config)
 963 {
 964         if (!VALID_CHANNEL(ch) || !dma_channels[ch].name || !config)
 965                 return -EINVAL;
 966
 967         pnx4008_dma_lock();
 968         config->ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
 969         config->ch_ctrl = __raw_readl(DMAC_Cx_CONTROL(ch));
 970
 971         config->ll_dma = __raw_readl(DMAC_Cx_LLI(ch));
 972         config->is_ll = config->ll_dma ? 1 : 0;
 973
 974         config->src_addr = __raw_readl(DMAC_Cx_SRC_ADDR(ch));
 975         config->dest_addr = __raw_readl(DMAC_Cx_DEST_ADDR(ch));
 976         pnx4008_dma_unlock();
 977
 978         return 0;
 979 }
 980
 981 EXPORT_SYMBOL_GPL(pnx4008_channel_get_config);
 982
 983 int pnx4008_dma_ch_enable(int ch)
 984 {
 985         unsigned long ch_cfg;
 986
 987         if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
 988                 return -EINVAL;
 989
 990         pnx4008_dma_lock();
 991         ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
 992         ch_cfg |= 1;
 993         __raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
 994         pnx4008_dma_unlock();
 995
 996         return 0;
 997 }
 998
 999 EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enable);
1000
1001 int pnx4008_dma_ch_disable(int ch)
1002 {
1003         unsigned long ch_cfg;
1004
1005         if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
1006                 return -EINVAL;
1007
1008         pnx4008_dma_lock();
1009         ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
1010         ch_cfg &= ~1;
1011         __raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
1012         pnx4008_dma_unlock();
1013
1014         return 0;
1015 }
1016
1017 EXPORT_SYMBOL_GPL(pnx4008_dma_ch_disable);
1018
1019 int pnx4008_dma_ch_enabled(int ch)
1020 {
1021         unsigned long ch_cfg;
1022
1023         if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
1024                 return -EINVAL;
1025
1026         pnx4008_dma_lock();
1027         ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
1028         pnx4008_dma_unlock();
1029
1030         return ch_cfg & 1;
1031 }
1032
1033 EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enabled);
1034
1035 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
1036 {
1037         int i;
1038         unsigned long dint = __raw_readl(DMAC_INT_STAT);
1039         unsigned long tcint = __raw_readl(DMAC_INT_TC_STAT);
1040         unsigned long eint = __raw_readl(DMAC_INT_ERR_STAT);
1041         unsigned long i_bit;
1042
1043         for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
1044                 i_bit = 1 << i;
1045                 if (dint & i_bit) {
1046                         struct dma_channel *channel = &dma_channels[i];
1047
1048                         if (channel->name && channel->irq_handler) {
1049                                 int cause = 0;
1050
1051                                 if (eint & i_bit)
1052                                         cause |= DMA_ERR_INT;
1053                                 if (tcint & i_bit)
1054                                         cause |= DMA_TC_INT;
1055                                 channel->irq_handler(i, cause, channel->data);
1056                         } else {
1057                                 /*
1058                                  * IRQ for an unregistered DMA channel
1059                                  */
1060                                 printk(KERN_WARNING
1061                                        "spurious IRQ for DMA channel %d\n", i);
1062                         }
1063                         if (tcint & i_bit)
1064                                 __raw_writel(i_bit, DMAC_INT_TC_CLEAR);
1065                         if (eint & i_bit)
1066                                 __raw_writel(i_bit, DMAC_INT_ERR_CLEAR);
1067                 }
1068         }
1069         return IRQ_HANDLED;
1070 }
1071
1072 static int __init pnx4008_dma_init(void)
1073 {
1074         int ret, i;
1075
1076         ret = request_irq(DMA_INT, dma_irq_handler, 0, "DMA", NULL);
1077         if (ret) {
1078                 printk(KERN_CRIT "Wow!  Can't register IRQ for DMA\n");
1079                 goto out;
1080         }
1081
1082         ll_pool.count = 0x4000 / sizeof(struct pnx4008_dma_ll);
1083         ll_pool.cur = ll_pool.vaddr =
1084             dma_alloc_coherent(NULL, ll_pool.count * sizeof(struct pnx4008_dma_ll),
1085                                &ll_pool.dma_addr, GFP_KERNEL);
1086
1087         if (!ll_pool.vaddr) {
1088                 ret = -ENOMEM;
1089                 free_irq(DMA_INT, NULL);
1090                 goto out;
1091         }
1092
1093         for (i = 0; i < ll_pool.count - 1; i++) {
1094                 void **addr = ll_pool.vaddr + i * sizeof(struct pnx4008_dma_ll);
1095                 *addr = (void *)addr + sizeof(struct pnx4008_dma_ll);
1096         }
1097         *(long *)(ll_pool.vaddr +
1098                   (ll_pool.count - 1) * sizeof(struct pnx4008_dma_ll)) =
1099             (long)ll_pool.vaddr;
1100
1101         __raw_writel(1, DMAC_CONFIG);
1102
1103 out:
1104         return ret;
1105 }
1106 arch_initcall(pnx4008_dma_init);