drivers/gpu/drm/omapdrm/omap_dmm_tiler.c

   1 /*
   2  * DMM IOMMU driver support functions for TI OMAP processors.
   3  *
   4  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: Rob Clark <[email protected]>
   6  *         Andy Gross <[email protected]>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation version 2.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/completion.h>
  19 #include <linux/delay.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/dmaengine.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/list.h>
  26 #include <linux/mm.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h> /* platform_device() */
  29 #include <linux/sched.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/slab.h>
  32 #include <linux/time.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/wait.h>
  35
  36 #include "omap_dmm_tiler.h"
  37 #include "omap_dmm_priv.h"
  38
  39 #define DMM_DRIVER_NAME "dmm"
  40
  41 /* mappings for associating views to luts */
  42 static struct tcm *containers[TILFMT_NFORMATS];
  43 static struct dmm *omap_dmm;
  44
  45 #if defined(CONFIG_OF)
  46 static const struct of_device_id dmm_of_match[];
  47 #endif
  48
  49 /* global spinlock for protecting lists */
  50 static DEFINE_SPINLOCK(list_lock);
  51
  52 /* Geometry table */
  53 #define GEOM(xshift, yshift, bytes_per_pixel) { \
  54                 .x_shft = (xshift), \
  55                 .y_shft = (yshift), \
  56                 .cpp    = (bytes_per_pixel), \
  57                 .slot_w = 1 << (SLOT_WIDTH_BITS - (xshift)), \
  58                 .slot_h = 1 << (SLOT_HEIGHT_BITS - (yshift)), \
  59         }
  60
  61 static const struct {
  62         u32 x_shft;     /* unused X-bits (as part of bpp) */
  63         u32 y_shft;     /* unused Y-bits (as part of bpp) */
  64         u32 cpp;                /* bytes/chars per pixel */
  65         u32 slot_w;     /* width of each slot (in pixels) */
  66         u32 slot_h;     /* height of each slot (in pixels) */
  67 } geom[TILFMT_NFORMATS] = {
  68         [TILFMT_8BIT]  = GEOM(0, 0, 1),
  69         [TILFMT_16BIT] = GEOM(0, 1, 2),
  70         [TILFMT_32BIT] = GEOM(1, 1, 4),
  71         [TILFMT_PAGE]  = GEOM(SLOT_WIDTH_BITS, SLOT_HEIGHT_BITS, 1),
  72 };
  73
  74
  75 /* lookup table for registers w/ per-engine instances */
  76 static const u32 reg[][4] = {
  77         [PAT_STATUS] = {DMM_PAT_STATUS__0, DMM_PAT_STATUS__1,
  78                         DMM_PAT_STATUS__2, DMM_PAT_STATUS__3},
  79         [PAT_DESCR]  = {DMM_PAT_DESCR__0, DMM_PAT_DESCR__1,
  80                         DMM_PAT_DESCR__2, DMM_PAT_DESCR__3},
  81 };
  82
  83 static int dmm_dma_copy(struct dmm *dmm, dma_addr_t src, dma_addr_t dst)
  84 {
  85         struct dma_async_tx_descriptor *tx;
  86         enum dma_status status;
  87         dma_cookie_t cookie;
  88
  89         tx = dmaengine_prep_dma_memcpy(dmm->wa_dma_chan, dst, src, 4, 0);
  90         if (!tx) {
  91                 dev_err(dmm->dev, "Failed to prepare DMA memcpy\n");
  92                 return -EIO;
  93         }
  94
  95         cookie = tx->tx_submit(tx);
  96         if (dma_submit_error(cookie)) {
  97                 dev_err(dmm->dev, "Failed to do DMA tx_submit\n");
  98                 return -EIO;
  99         }
 100
 101         status = dma_sync_wait(dmm->wa_dma_chan, cookie);
 102         if (status != DMA_COMPLETE)
 103                 dev_err(dmm->dev, "i878 wa DMA copy failure\n");
 104
 105         dmaengine_terminate_all(dmm->wa_dma_chan);
 106         return 0;
 107 }
 108
 109 static u32 dmm_read_wa(struct dmm *dmm, u32 reg)
 110 {
 111         dma_addr_t src, dst;
 112         int r;
 113
 114         src = dmm->phys_base + reg;
 115         dst = dmm->wa_dma_handle;
 116
 117         r = dmm_dma_copy(dmm, src, dst);
 118         if (r) {
 119                 dev_err(dmm->dev, "sDMA read transfer timeout\n");
 120                 return readl(dmm->base + reg);
 121         }
 122
 123         /*
 124          * As per i878 workaround, the DMA is used to access the DMM registers.
 125          * Make sure that the readl is not moved by the compiler or the CPU
 126          * earlier than the DMA finished writing the value to memory.
 127          */
 128         rmb();
 129         return readl(dmm->wa_dma_data);
 130 }
 131
 132 static void dmm_write_wa(struct dmm *dmm, u32 val, u32 reg)
 133 {
 134         dma_addr_t src, dst;
 135         int r;
 136
 137         writel(val, dmm->wa_dma_data);
 138         /*
 139          * As per i878 workaround, the DMA is used to access the DMM registers.
 140          * Make sure that the writel is not moved by the compiler or the CPU, so
 141          * the data will be in place before we start the DMA to do the actual
 142          * register write.
 143          */
 144         wmb();
 145
 146         src = dmm->wa_dma_handle;
 147         dst = dmm->phys_base + reg;
 148
 149         r = dmm_dma_copy(dmm, src, dst);
 150         if (r) {
 151                 dev_err(dmm->dev, "sDMA write transfer timeout\n");
 152                 writel(val, dmm->base + reg);
 153         }
 154 }
 155
 156 static u32 dmm_read(struct dmm *dmm, u32 reg)
 157 {
 158         if (dmm->dmm_workaround) {
 159                 u32 v;
 160                 unsigned long flags;
 161
 162                 spin_lock_irqsave(&dmm->wa_lock, flags);
 163                 v = dmm_read_wa(dmm, reg);
 164                 spin_unlock_irqrestore(&dmm->wa_lock, flags);
 165
 166                 return v;
 167         } else {
 168                 return readl(dmm->base + reg);
 169         }
 170 }
 171
 172 static void dmm_write(struct dmm *dmm, u32 val, u32 reg)
 173 {
 174         if (dmm->dmm_workaround) {
 175                 unsigned long flags;
 176
 177                 spin_lock_irqsave(&dmm->wa_lock, flags);
 178                 dmm_write_wa(dmm, val, reg);
 179                 spin_unlock_irqrestore(&dmm->wa_lock, flags);
 180         } else {
 181                 writel(val, dmm->base + reg);
 182         }
 183 }
 184
 185 static int dmm_workaround_init(struct dmm *dmm)
 186 {
 187         dma_cap_mask_t mask;
 188
 189         spin_lock_init(&dmm->wa_lock);
 190
 191         dmm->wa_dma_data = dma_alloc_coherent(dmm->dev,  sizeof(u32),
 192                                               &dmm->wa_dma_handle, GFP_KERNEL);
 193         if (!dmm->wa_dma_data)
 194                 return -ENOMEM;
 195
 196         dma_cap_zero(mask);
 197         dma_cap_set(DMA_MEMCPY, mask);
 198
 199         dmm->wa_dma_chan = dma_request_channel(mask, NULL, NULL);
 200         if (!dmm->wa_dma_chan) {
 201                 dma_free_coherent(dmm->dev, 4, dmm->wa_dma_data, dmm->wa_dma_handle);
 202                 return -ENODEV;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static void dmm_workaround_uninit(struct dmm *dmm)
 209 {
 210         dma_release_channel(dmm->wa_dma_chan);
 211
 212         dma_free_coherent(dmm->dev, 4, dmm->wa_dma_data, dmm->wa_dma_handle);
 213 }
 214
 215 /* simple allocator to grab next 16 byte aligned memory from txn */
 216 static void *alloc_dma(struct dmm_txn *txn, size_t sz, dma_addr_t *pa)
 217 {
 218         void *ptr;
 219         struct refill_engine *engine = txn->engine_handle;
 220
 221         /* dmm programming requires 16 byte aligned addresses */
 222         txn->current_pa = round_up(txn->current_pa, 16);
 223         txn->current_va = (void *)round_up((long)txn->current_va, 16);
 224
 225         ptr = txn->current_va;
 226         *pa = txn->current_pa;
 227
 228         txn->current_pa += sz;
 229         txn->current_va += sz;
 230
 231         BUG_ON((txn->current_va - engine->refill_va) > REFILL_BUFFER_SIZE);
 232
 233         return ptr;
 234 }
 235
 236 /* check status and spin until wait_mask comes true */
 237 static int wait_status(struct refill_engine *engine, u32 wait_mask)
 238 {
 239         struct dmm *dmm = engine->dmm;
 240         u32 r = 0, err, i;
 241
 242         i = DMM_FIXED_RETRY_COUNT;
 243         while (true) {
 244                 r = dmm_read(dmm, reg[PAT_STATUS][engine->id]);
 245                 err = r & DMM_PATSTATUS_ERR;
 246                 if (err) {
 247                         dev_err(dmm->dev,
 248                                 "%s: error (engine%d). PAT_STATUS: 0x%08x\n",
 249                                 __func__, engine->id, r);
 250                         return -EFAULT;
 251                 }
 252
 253                 if ((r & wait_mask) == wait_mask)
 254                         break;
 255
 256                 if (--i == 0) {
 257                         dev_err(dmm->dev,
 258                                 "%s: timeout (engine%d). PAT_STATUS: 0x%08x\n",
 259                                 __func__, engine->id, r);
 260                         return -ETIMEDOUT;
 261                 }
 262
 263                 udelay(1);
 264         }
 265
 266         return 0;
 267 }
 268
 269 static void release_engine(struct refill_engine *engine)
 270 {
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&list_lock, flags);
 274         list_add(&engine->idle_node, &omap_dmm->idle_head);
 275         spin_unlock_irqrestore(&list_lock, flags);
 276
 277         atomic_inc(&omap_dmm->engine_counter);
 278         wake_up_interruptible(&omap_dmm->engine_queue);
 279 }
 280
 281 static irqreturn_t omap_dmm_irq_handler(int irq, void *arg)
 282 {
 283         struct dmm *dmm = arg;
 284         u32 status = dmm_read(dmm, DMM_PAT_IRQSTATUS);
 285         int i;
 286
 287         /* ack IRQ */
 288         dmm_write(dmm, status, DMM_PAT_IRQSTATUS);
 289
 290         for (i = 0; i < dmm->num_engines; i++) {
 291                 if (status & DMM_IRQSTAT_ERR_MASK)
 292                         dev_err(dmm->dev,
 293                                 "irq error(engine%d): IRQSTAT 0x%02x\n",
 294                                 i, status & 0xff);
 295
 296                 if (status & DMM_IRQSTAT_LST) {
 297                         if (dmm->engines[i].async)
 298                                 release_engine(&dmm->engines[i]);
 299
 300                         complete(&dmm->engines[i].compl);
 301                 }
 302
 303                 status >>= 8;
 304         }
 305
 306         return IRQ_HANDLED;
 307 }
 308
 309 /**
 310  * Get a handle for a DMM transaction
 311  */
 312 static struct dmm_txn *dmm_txn_init(struct dmm *dmm, struct tcm *tcm)
 313 {
 314         struct dmm_txn *txn = NULL;
 315         struct refill_engine *engine = NULL;
 316         int ret;
 317         unsigned long flags;
 318
 319
 320         /* wait until an engine is available */
 321         ret = wait_event_interruptible(omap_dmm->engine_queue,
 322                 atomic_add_unless(&omap_dmm->engine_counter, -1, 0));
 323         if (ret)
 324                 return ERR_PTR(ret);
 325
 326         /* grab an idle engine */
 327         spin_lock_irqsave(&list_lock, flags);
 328         if (!list_empty(&dmm->idle_head)) {
 329                 engine = list_entry(dmm->idle_head.next, struct refill_engine,
 330                                         idle_node);
 331                 list_del(&engine->idle_node);
 332         }
 333         spin_unlock_irqrestore(&list_lock, flags);
 334
 335         BUG_ON(!engine);
 336
 337         txn = &engine->txn;
 338         engine->tcm = tcm;
 339         txn->engine_handle = engine;
 340         txn->last_pat = NULL;
 341         txn->current_va = engine->refill_va;
 342         txn->current_pa = engine->refill_pa;
 343
 344         return txn;
 345 }
 346
 347 /**
 348  * Add region to DMM transaction.  If pages or pages[i] is NULL, then the
 349  * corresponding slot is cleared (ie. dummy_pa is programmed)
 350  */
 351 static void dmm_txn_append(struct dmm_txn *txn, struct pat_area *area,
 352                 struct page **pages, u32 npages, u32 roll)
 353 {
 354         dma_addr_t pat_pa = 0, data_pa = 0;
 355         u32 *data;
 356         struct pat *pat;
 357         struct refill_engine *engine = txn->engine_handle;
 358         int columns = (1 + area->x1 - area->x0);
 359         int rows = (1 + area->y1 - area->y0);
 360         int i = columns*rows;
 361
 362         pat = alloc_dma(txn, sizeof(*pat), &pat_pa);
 363
 364         if (txn->last_pat)
 365                 txn->last_pat->next_pa = (u32)pat_pa;
 366
 367         pat->area = *area;
 368
 369         /* adjust Y coordinates based off of container parameters */
 370         pat->area.y0 += engine->tcm->y_offset;
 371         pat->area.y1 += engine->tcm->y_offset;
 372
 373         pat->ctrl = (struct pat_ctrl){
 374                         .start = 1,
 375                         .lut_id = engine->tcm->lut_id,
 376                 };
 377
 378         data = alloc_dma(txn, 4*i, &data_pa);
 379         /* FIXME: what if data_pa is more than 32-bit ? */
 380         pat->data_pa = data_pa;
 381
 382         while (i--) {
 383                 int n = i + roll;
 384                 if (n >= npages)
 385                         n -= npages;
 386                 data[i] = (pages && pages[n]) ?
 387                         page_to_phys(pages[n]) : engine->dmm->dummy_pa;
 388         }
 389
 390         txn->last_pat = pat;
 391
 392         return;
 393 }
 394
 395 /**
 396  * Commit the DMM transaction.
 397  */
 398 static int dmm_txn_commit(struct dmm_txn *txn, bool wait)
 399 {
 400         int ret = 0;
 401         struct refill_engine *engine = txn->engine_handle;
 402         struct dmm *dmm = engine->dmm;
 403
 404         if (!txn->last_pat) {
 405                 dev_err(engine->dmm->dev, "need at least one txn\n");
 406                 ret = -EINVAL;
 407                 goto cleanup;
 408         }
 409
 410         txn->last_pat->next_pa = 0;
 411         /* ensure that the written descriptors are visible to DMM */
 412         wmb();
 413
 414         /*
 415          * NOTE: the wmb() above should be enough, but there seems to be a bug
 416          * in OMAP's memory barrier implementation, which in some rare cases may
 417          * cause the writes not to be observable after wmb().
 418          */
 419
 420         /* read back to ensure the data is in RAM */
 421         readl(&txn->last_pat->next_pa);
 422
 423         /* write to PAT_DESCR to clear out any pending transaction */
 424         dmm_write(dmm, 0x0, reg[PAT_DESCR][engine->id]);
 425
 426         /* wait for engine ready: */
 427         ret = wait_status(engine, DMM_PATSTATUS_READY);
 428         if (ret) {
 429                 ret = -EFAULT;
 430                 goto cleanup;
 431         }
 432
 433         /* mark whether it is async to denote list management in IRQ handler */
 434         engine->async = wait ? false : true;
 435         reinit_completion(&engine->compl);
 436         /* verify that the irq handler sees the 'async' and completion value */
 437         smp_mb();
 438
 439         /* kick reload */
 440         dmm_write(dmm, engine->refill_pa, reg[PAT_DESCR][engine->id]);
 441
 442         if (wait) {
 443                 if (!wait_for_completion_timeout(&engine->compl,
 444                                 msecs_to_jiffies(100))) {
 445                         dev_err(dmm->dev, "timed out waiting for done\n");
 446                         ret = -ETIMEDOUT;
 447                         goto cleanup;
 448                 }
 449
 450                 /* Check the engine status before continue */
 451                 ret = wait_status(engine, DMM_PATSTATUS_READY |
 452                                   DMM_PATSTATUS_VALID | DMM_PATSTATUS_DONE);
 453         }
 454
 455 cleanup:
 456         /* only place engine back on list if we are done with it */
 457         if (ret || wait)
 458                 release_engine(engine);
 459
 460         return ret;
 461 }
 462
 463 /*
 464  * DMM programming
 465  */
 466 static int fill(struct tcm_area *area, struct page **pages,
 467                 u32 npages, u32 roll, bool wait)
 468 {
 469         int ret = 0;
 470         struct tcm_area slice, area_s;
 471         struct dmm_txn *txn;
 472
 473         /*
 474          * FIXME
 475          *
 476          * Asynchronous fill does not work reliably, as the driver does not
 477          * handle errors in the async code paths. The fill operation may
 478          * silently fail, leading to leaking DMM engines, which may eventually
 479          * lead to deadlock if we run out of DMM engines.
 480          *
 481          * For now, always set 'wait' so that we only use sync fills. Async
 482          * fills should be fixed, or alternatively we could decide to only
 483          * support sync fills and so the whole async code path could be removed.
 484          */
 485
 486         wait = true;
 487
 488         txn = dmm_txn_init(omap_dmm, area->tcm);
 489         if (IS_ERR_OR_NULL(txn))
 490                 return -ENOMEM;
 491
 492         tcm_for_each_slice(slice, *area, area_s) {
 493                 struct pat_area p_area = {
 494                                 .x0 = slice.p0.x,  .y0 = slice.p0.y,
 495                                 .x1 = slice.p1.x,  .y1 = slice.p1.y,
 496                 };
 497
 498                 dmm_txn_append(txn, &p_area, pages, npages, roll);
 499
 500                 roll += tcm_sizeof(slice);
 501         }
 502
 503         ret = dmm_txn_commit(txn, wait);
 504
 505         return ret;
 506 }
 507
 508 /*
 509  * Pin/unpin
 510  */
 511
 512 /* note: slots for which pages[i] == NULL are filled w/ dummy page
 513  */
 514 int tiler_pin(struct tiler_block *block, struct page **pages,
 515                 u32 npages, u32 roll, bool wait)
 516 {
 517         int ret;
 518
 519         ret = fill(&block->area, pages, npages, roll, wait);
 520
 521         if (ret)
 522                 tiler_unpin(block);
 523
 524         return ret;
 525 }
 526
 527 int tiler_unpin(struct tiler_block *block)
 528 {
 529         return fill(&block->area, NULL, 0, 0, false);
 530 }
 531
 532 /*
 533  * Reserve/release
 534  */
 535 struct tiler_block *tiler_reserve_2d(enum tiler_fmt fmt, u16 w,
 536                 u16 h, u16 align)
 537 {
 538         struct tiler_block *block;
 539         u32 min_align = 128;
 540         int ret;
 541         unsigned long flags;
 542         u32 slot_bytes;
 543
 544         block = kzalloc(sizeof(*block), GFP_KERNEL);
 545         if (!block)
 546                 return ERR_PTR(-ENOMEM);
 547
 548         BUG_ON(!validfmt(fmt));
 549
 550         /* convert width/height to slots */
 551         w = DIV_ROUND_UP(w, geom[fmt].slot_w);
 552         h = DIV_ROUND_UP(h, geom[fmt].slot_h);
 553
 554         /* convert alignment to slots */
 555         slot_bytes = geom[fmt].slot_w * geom[fmt].cpp;
 556         min_align = max(min_align, slot_bytes);
 557         align = (align > min_align) ? ALIGN(align, min_align) : min_align;
 558         align /= slot_bytes;
 559
 560         block->fmt = fmt;
 561
 562         ret = tcm_reserve_2d(containers[fmt], w, h, align, -1, slot_bytes,
 563                         &block->area);
 564         if (ret) {
 565                 kfree(block);
 566                 return ERR_PTR(-ENOMEM);
 567         }
 568
 569         /* add to allocation list */
 570         spin_lock_irqsave(&list_lock, flags);
 571         list_add(&block->alloc_node, &omap_dmm->alloc_head);
 572         spin_unlock_irqrestore(&list_lock, flags);
 573
 574         return block;
 575 }
 576
 577 struct tiler_block *tiler_reserve_1d(size_t size)
 578 {
 579         struct tiler_block *block = kzalloc(sizeof(*block), GFP_KERNEL);
 580         int num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 581         unsigned long flags;
 582
 583         if (!block)
 584                 return ERR_PTR(-ENOMEM);
 585
 586         block->fmt = TILFMT_PAGE;
 587
 588         if (tcm_reserve_1d(containers[TILFMT_PAGE], num_pages,
 589                                 &block->area)) {
 590                 kfree(block);
 591                 return ERR_PTR(-ENOMEM);
 592         }
 593
 594         spin_lock_irqsave(&list_lock, flags);
 595         list_add(&block->alloc_node, &omap_dmm->alloc_head);
 596         spin_unlock_irqrestore(&list_lock, flags);
 597
 598         return block;
 599 }
 600
 601 /* note: if you have pin'd pages, you should have already unpin'd first! */
 602 int tiler_release(struct tiler_block *block)
 603 {
 604         int ret = tcm_free(&block->area);
 605         unsigned long flags;
 606
 607         if (block->area.tcm)
 608                 dev_err(omap_dmm->dev, "failed to release block\n");
 609
 610         spin_lock_irqsave(&list_lock, flags);
 611         list_del(&block->alloc_node);
 612         spin_unlock_irqrestore(&list_lock, flags);
 613
 614         kfree(block);
 615         return ret;
 616 }
 617
 618 /*
 619  * Utils
 620  */
 621
 622 /* calculate the tiler space address of a pixel in a view orientation...
 623  * below description copied from the display subsystem section of TRM:
 624  *
 625  * When the TILER is addressed, the bits:
 626  *   [28:27] = 0x0 for 8-bit tiled
 627  *             0x1 for 16-bit tiled
 628  *             0x2 for 32-bit tiled
 629  *             0x3 for page mode
 630  *   [31:29] = 0x0 for 0-degree view
 631  *             0x1 for 180-degree view + mirroring
 632  *             0x2 for 0-degree view + mirroring
 633  *             0x3 for 180-degree view
 634  *             0x4 for 270-degree view + mirroring
 635  *             0x5 for 270-degree view
 636  *             0x6 for 90-degree view
 637  *             0x7 for 90-degree view + mirroring
 638  * Otherwise the bits indicated the corresponding bit address to access
 639  * the SDRAM.
 640  */
 641 static u32 tiler_get_address(enum tiler_fmt fmt, u32 orient, u32 x, u32 y)
 642 {
 643         u32 x_bits, y_bits, tmp, x_mask, y_mask, alignment;
 644
 645         x_bits = CONT_WIDTH_BITS - geom[fmt].x_shft;
 646         y_bits = CONT_HEIGHT_BITS - geom[fmt].y_shft;
 647         alignment = geom[fmt].x_shft + geom[fmt].y_shft;
 648
 649         /* validate coordinate */
 650         x_mask = MASK(x_bits);
 651         y_mask = MASK(y_bits);
 652
 653         if (x < 0 || x > x_mask || y < 0 || y > y_mask) {
 654                 DBG("invalid coords: %u < 0 || %u > %u || %u < 0 || %u > %u",
 655                                 x, x, x_mask, y, y, y_mask);
 656                 return 0;
 657         }
 658
 659         /* account for mirroring */
 660         if (orient & MASK_X_INVERT)
 661                 x ^= x_mask;
 662         if (orient & MASK_Y_INVERT)
 663                 y ^= y_mask;
 664
 665         /* get coordinate address */
 666         if (orient & MASK_XY_FLIP)
 667                 tmp = ((x << y_bits) + y);
 668         else
 669                 tmp = ((y << x_bits) + x);
 670
 671         return TIL_ADDR((tmp << alignment), orient, fmt);
 672 }
 673
 674 dma_addr_t tiler_ssptr(struct tiler_block *block)
 675 {
 676         BUG_ON(!validfmt(block->fmt));
 677
 678         return TILVIEW_8BIT + tiler_get_address(block->fmt, 0,
 679                         block->area.p0.x * geom[block->fmt].slot_w,
 680                         block->area.p0.y * geom[block->fmt].slot_h);
 681 }
 682
 683 dma_addr_t tiler_tsptr(struct tiler_block *block, u32 orient,
 684                 u32 x, u32 y)
 685 {
 686         struct tcm_pt *p = &block->area.p0;
 687         BUG_ON(!validfmt(block->fmt));
 688
 689         return tiler_get_address(block->fmt, orient,
 690                         (p->x * geom[block->fmt].slot_w) + x,
 691                         (p->y * geom[block->fmt].slot_h) + y);
 692 }
 693
 694 void tiler_align(enum tiler_fmt fmt, u16 *w, u16 *h)
 695 {
 696         BUG_ON(!validfmt(fmt));
 697         *w = round_up(*w, geom[fmt].slot_w);
 698         *h = round_up(*h, geom[fmt].slot_h);
 699 }
 700
 701 u32 tiler_stride(enum tiler_fmt fmt, u32 orient)
 702 {
 703         BUG_ON(!validfmt(fmt));
 704
 705         if (orient & MASK_XY_FLIP)
 706                 return 1 << (CONT_HEIGHT_BITS + geom[fmt].x_shft);
 707         else
 708                 return 1 << (CONT_WIDTH_BITS + geom[fmt].y_shft);
 709 }
 710
 711 size_t tiler_size(enum tiler_fmt fmt, u16 w, u16 h)
 712 {
 713         tiler_align(fmt, &w, &h);
 714         return geom[fmt].cpp * w * h;
 715 }
 716
 717 size_t tiler_vsize(enum tiler_fmt fmt, u16 w, u16 h)
 718 {
 719         BUG_ON(!validfmt(fmt));
 720         return round_up(geom[fmt].cpp * w, PAGE_SIZE) * h;
 721 }
 722
 723 u32 tiler_get_cpu_cache_flags(void)
 724 {
 725         return omap_dmm->plat_data->cpu_cache_flags;
 726 }
 727
 728 bool dmm_is_available(void)
 729 {
 730         return omap_dmm ? true : false;
 731 }
 732
 733 static int omap_dmm_remove(struct platform_device *dev)
 734 {
 735         struct tiler_block *block, *_block;
 736         int i;
 737         unsigned long flags;
 738
 739         if (omap_dmm) {
 740                 /* Disable all enabled interrupts */
 741                 dmm_write(omap_dmm, 0x7e7e7e7e, DMM_PAT_IRQENABLE_CLR);
 742                 free_irq(omap_dmm->irq, omap_dmm);
 743
 744                 /* free all area regions */
 745                 spin_lock_irqsave(&list_lock, flags);
 746                 list_for_each_entry_safe(block, _block, &omap_dmm->alloc_head,
 747                                         alloc_node) {
 748                         list_del(&block->alloc_node);
 749                         kfree(block);
 750                 }
 751                 spin_unlock_irqrestore(&list_lock, flags);
 752
 753                 for (i = 0; i < omap_dmm->num_lut; i++)
 754                         if (omap_dmm->tcm && omap_dmm->tcm[i])
 755                                 omap_dmm->tcm[i]->deinit(omap_dmm->tcm[i]);
 756                 kfree(omap_dmm->tcm);
 757
 758                 kfree(omap_dmm->engines);
 759                 if (omap_dmm->refill_va)
 760                         dma_free_wc(omap_dmm->dev,
 761                                     REFILL_BUFFER_SIZE * omap_dmm->num_engines,
 762                                     omap_dmm->refill_va, omap_dmm->refill_pa);
 763                 if (omap_dmm->dummy_page)
 764                         __free_page(omap_dmm->dummy_page);
 765
 766                 if (omap_dmm->dmm_workaround)
 767                         dmm_workaround_uninit(omap_dmm);
 768
 769                 iounmap(omap_dmm->base);
 770                 kfree(omap_dmm);
 771                 omap_dmm = NULL;
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int omap_dmm_probe(struct platform_device *dev)
 778 {
 779         int ret = -EFAULT, i;
 780         struct tcm_area area = {0};
 781         u32 hwinfo, pat_geom;
 782         struct resource *mem;
 783
 784         omap_dmm = kzalloc(sizeof(*omap_dmm), GFP_KERNEL);
 785         if (!omap_dmm)
 786                 goto fail;
 787
 788         /* initialize lists */
 789         INIT_LIST_HEAD(&omap_dmm->alloc_head);
 790         INIT_LIST_HEAD(&omap_dmm->idle_head);
 791
 792         init_waitqueue_head(&omap_dmm->engine_queue);
 793
 794         if (dev->dev.of_node) {
 795                 const struct of_device_id *match;
 796
 797                 match = of_match_node(dmm_of_match, dev->dev.of_node);
 798                 if (!match) {
 799                         dev_err(&dev->dev, "failed to find matching device node\n");
 800                         ret = -ENODEV;
 801                         goto fail;
 802                 }
 803
 804                 omap_dmm->plat_data = match->data;
 805         }
 806
 807         /* lookup hwmod data - base address and irq */
 808         mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 809         if (!mem) {
 810                 dev_err(&dev->dev, "failed to get base address resource\n");
 811                 goto fail;
 812         }
 813
 814         omap_dmm->phys_base = mem->start;
 815         omap_dmm->base = ioremap(mem->start, SZ_2K);
 816
 817         if (!omap_dmm->base) {
 818                 dev_err(&dev->dev, "failed to get dmm base address\n");
 819                 goto fail;
 820         }
 821
 822         omap_dmm->irq = platform_get_irq(dev, 0);
 823         if (omap_dmm->irq < 0) {
 824                 dev_err(&dev->dev, "failed to get IRQ resource\n");
 825                 goto fail;
 826         }
 827
 828         omap_dmm->dev = &dev->dev;
 829
 830         if (of_machine_is_compatible("ti,dra7")) {
 831                 /*
 832                  * DRA7 Errata i878 says that MPU should not be used to access
 833                  * RAM and DMM at the same time. As it's not possible to prevent
 834                  * MPU accessing RAM, we need to access DMM via a proxy.
 835                  */
 836                 if (!dmm_workaround_init(omap_dmm)) {
 837                         omap_dmm->dmm_workaround = true;
 838                         dev_info(&dev->dev,
 839                                 "workaround for errata i878 in use\n");
 840                 } else {
 841                         dev_warn(&dev->dev,
 842                                  "failed to initialize work-around for i878\n");
 843                 }
 844         }
 845
 846         hwinfo = dmm_read(omap_dmm, DMM_PAT_HWINFO);
 847         omap_dmm->num_engines = (hwinfo >> 24) & 0x1F;
 848         omap_dmm->num_lut = (hwinfo >> 16) & 0x1F;
 849         omap_dmm->container_width = 256;
 850         omap_dmm->container_height = 128;
 851
 852         atomic_set(&omap_dmm->engine_counter, omap_dmm->num_engines);
 853
 854         /* read out actual LUT width and height */
 855         pat_geom = dmm_read(omap_dmm, DMM_PAT_GEOMETRY);
 856         omap_dmm->lut_width = ((pat_geom >> 16) & 0xF) << 5;
 857         omap_dmm->lut_height = ((pat_geom >> 24) & 0xF) << 5;
 858
 859         /* increment LUT by one if on OMAP5 */
 860         /* LUT has twice the height, and is split into a separate container */
 861         if (omap_dmm->lut_height != omap_dmm->container_height)
 862                 omap_dmm->num_lut++;
 863
 864         /* initialize DMM registers */
 865         dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__0);
 866         dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__1);
 867         dmm_write(omap_dmm, 0x80808080, DMM_PAT_VIEW_MAP__0);
 868         dmm_write(omap_dmm, 0x80000000, DMM_PAT_VIEW_MAP_BASE);
 869         dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__0);
 870         dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__1);
 871
 872         omap_dmm->dummy_page = alloc_page(GFP_KERNEL | __GFP_DMA32);
 873         if (!omap_dmm->dummy_page) {
 874                 dev_err(&dev->dev, "could not allocate dummy page\n");
 875                 ret = -ENOMEM;
 876                 goto fail;
 877         }
 878
 879         /* set dma mask for device */
 880         ret = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
 881         if (ret)
 882                 goto fail;
 883
 884         omap_dmm->dummy_pa = page_to_phys(omap_dmm->dummy_page);
 885
 886         /* alloc refill memory */
 887         omap_dmm->refill_va = dma_alloc_wc(&dev->dev,
 888                                            REFILL_BUFFER_SIZE * omap_dmm->num_engines,
 889                                            &omap_dmm->refill_pa, GFP_KERNEL);
 890         if (!omap_dmm->refill_va) {
 891                 dev_err(&dev->dev, "could not allocate refill memory\n");
 892                 goto fail;
 893         }
 894
 895         /* alloc engines */
 896         omap_dmm->engines = kcalloc(omap_dmm->num_engines,
 897                                     sizeof(*omap_dmm->engines), GFP_KERNEL);
 898         if (!omap_dmm->engines) {
 899                 ret = -ENOMEM;
 900                 goto fail;
 901         }
 902
 903         for (i = 0; i < omap_dmm->num_engines; i++) {
 904                 omap_dmm->engines[i].id = i;
 905                 omap_dmm->engines[i].dmm = omap_dmm;
 906                 omap_dmm->engines[i].refill_va = omap_dmm->refill_va +
 907                                                 (REFILL_BUFFER_SIZE * i);
 908                 omap_dmm->engines[i].refill_pa = omap_dmm->refill_pa +
 909                                                 (REFILL_BUFFER_SIZE * i);
 910                 init_completion(&omap_dmm->engines[i].compl);
 911
 912                 list_add(&omap_dmm->engines[i].idle_node, &omap_dmm->idle_head);
 913         }
 914
 915         omap_dmm->tcm = kcalloc(omap_dmm->num_lut, sizeof(*omap_dmm->tcm),
 916                                 GFP_KERNEL);
 917         if (!omap_dmm->tcm) {
 918                 ret = -ENOMEM;
 919                 goto fail;
 920         }
 921
 922         /* init containers */
 923         /* Each LUT is associated with a TCM (container manager).  We use the
 924            lut_id to denote the lut_id used to identify the correct LUT for
 925            programming during reill operations */
 926         for (i = 0; i < omap_dmm->num_lut; i++) {
 927                 omap_dmm->tcm[i] = sita_init(omap_dmm->container_width,
 928                                                 omap_dmm->container_height);
 929
 930                 if (!omap_dmm->tcm[i]) {
 931                         dev_err(&dev->dev, "failed to allocate container\n");
 932                         ret = -ENOMEM;
 933                         goto fail;
 934                 }
 935
 936                 omap_dmm->tcm[i]->lut_id = i;
 937         }
 938
 939         /* assign access mode containers to applicable tcm container */
 940         /* OMAP 4 has 1 container for all 4 views */
 941         /* OMAP 5 has 2 containers, 1 for 2D and 1 for 1D */
 942         containers[TILFMT_8BIT] = omap_dmm->tcm[0];
 943         containers[TILFMT_16BIT] = omap_dmm->tcm[0];
 944         containers[TILFMT_32BIT] = omap_dmm->tcm[0];
 945
 946         if (omap_dmm->container_height != omap_dmm->lut_height) {
 947                 /* second LUT is used for PAGE mode.  Programming must use
 948                    y offset that is added to all y coordinates.  LUT id is still
 949                    0, because it is the same LUT, just the upper 128 lines */
 950                 containers[TILFMT_PAGE] = omap_dmm->tcm[1];
 951                 omap_dmm->tcm[1]->y_offset = OMAP5_LUT_OFFSET;
 952                 omap_dmm->tcm[1]->lut_id = 0;
 953         } else {
 954                 containers[TILFMT_PAGE] = omap_dmm->tcm[0];
 955         }
 956
 957         area = (struct tcm_area) {
 958                 .tcm = NULL,
 959                 .p1.x = omap_dmm->container_width - 1,
 960                 .p1.y = omap_dmm->container_height - 1,
 961         };
 962
 963         ret = request_irq(omap_dmm->irq, omap_dmm_irq_handler, IRQF_SHARED,
 964                                 "omap_dmm_irq_handler", omap_dmm);
 965
 966         if (ret) {
 967                 dev_err(&dev->dev, "couldn't register IRQ %d, error %d\n",
 968                         omap_dmm->irq, ret);
 969                 omap_dmm->irq = -1;
 970                 goto fail;
 971         }
 972
 973         /* Enable all interrupts for each refill engine except
 974          * ERR_LUT_MISS<n> (which is just advisory, and we don't care
 975          * about because we want to be able to refill live scanout
 976          * buffers for accelerated pan/scroll) and FILL_DSC<n> which
 977          * we just generally don't care about.
 978          */
 979         dmm_write(omap_dmm, 0x7e7e7e7e, DMM_PAT_IRQENABLE_SET);
 980
 981         /* initialize all LUTs to dummy page entries */
 982         for (i = 0; i < omap_dmm->num_lut; i++) {
 983                 area.tcm = omap_dmm->tcm[i];
 984                 if (fill(&area, NULL, 0, 0, true))
 985                         dev_err(omap_dmm->dev, "refill failed");
 986         }
 987
 988         dev_info(omap_dmm->dev, "initialized all PAT entries\n");
 989
 990         return 0;
 991
 992 fail:
 993         if (omap_dmm_remove(dev))
 994                 dev_err(&dev->dev, "cleanup failed\n");
 995         return ret;
 996 }
 997
 998 /*
 999  * debugfs support
1000  */
1001
1002 #ifdef CONFIG_DEBUG_FS
1003
1004 static const char *alphabet = "abcdefghijklmnopqrstuvwxyz"
1005                                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
1006 static const char *special = ".,:;'\"`~!^-+";
1007
1008 static void fill_map(char **map, int xdiv, int ydiv, struct tcm_area *a,
1009                                                         char c, bool ovw)
1010 {
1011         int x, y;
1012         for (y = a->p0.y / ydiv; y <= a->p1.y / ydiv; y++)
1013                 for (x = a->p0.x / xdiv; x <= a->p1.x / xdiv; x++)
1014                         if (map[y][x] == ' ' || ovw)
1015                                 map[y][x] = c;
1016 }
1017
1018 static void fill_map_pt(char **map, int xdiv, int ydiv, struct tcm_pt *p,
1019                                                                         char c)
1020 {
1021         map[p->y / ydiv][p->x / xdiv] = c;
1022 }
1023
1024 static char read_map_pt(char **map, int xdiv, int ydiv, struct tcm_pt *p)
1025 {
1026         return map[p->y / ydiv][p->x / xdiv];
1027 }
1028
1029 static int map_width(int xdiv, int x0, int x1)
1030 {
1031         return (x1 / xdiv) - (x0 / xdiv) + 1;
1032 }
1033
1034 static void text_map(char **map, int xdiv, char *nice, int yd, int x0, int x1)
1035 {
1036         char *p = map[yd] + (x0 / xdiv);
1037         int w = (map_width(xdiv, x0, x1) - strlen(nice)) / 2;
1038         if (w >= 0) {
1039                 p += w;
1040                 while (*nice)
1041                         *p++ = *nice++;
1042         }
1043 }
1044
1045 static void map_1d_info(char **map, int xdiv, int ydiv, char *nice,
1046                                                         struct tcm_area *a)
1047 {
1048         sprintf(nice, "%dK", tcm_sizeof(*a) * 4);
1049         if (a->p0.y + 1 < a->p1.y) {
1050                 text_map(map, xdiv, nice, (a->p0.y + a->p1.y) / 2 / ydiv, 0,
1051                                                         256 - 1);
1052         } else if (a->p0.y < a->p1.y) {
1053                 if (strlen(nice) < map_width(xdiv, a->p0.x, 256 - 1))
1054                         text_map(map, xdiv, nice, a->p0.y / ydiv,
1055                                         a->p0.x + xdiv, 256 - 1);
1056                 else if (strlen(nice) < map_width(xdiv, 0, a->p1.x))
1057                         text_map(map, xdiv, nice, a->p1.y / ydiv,
1058                                         0, a->p1.y - xdiv);
1059         } else if (strlen(nice) + 1 < map_width(xdiv, a->p0.x, a->p1.x)) {
1060                 text_map(map, xdiv, nice, a->p0.y / ydiv, a->p0.x, a->p1.x);
1061         }
1062 }
1063
1064 static void map_2d_info(char **map, int xdiv, int ydiv, char *nice,
1065                                                         struct tcm_area *a)
1066 {
1067         sprintf(nice, "(%d*%d)", tcm_awidth(*a), tcm_aheight(*a));
1068         if (strlen(nice) + 1 < map_width(xdiv, a->p0.x, a->p1.x))
1069                 text_map(map, xdiv, nice, (a->p0.y + a->p1.y) / 2 / ydiv,
1070                                                         a->p0.x, a->p1.x);
1071 }
1072
1073 int tiler_map_show(struct seq_file *s, void *arg)
1074 {
1075         int xdiv = 2, ydiv = 1;
1076         char **map = NULL, *global_map;
1077         struct tiler_block *block;
1078         struct tcm_area a, p;
1079         int i;
1080         const char *m2d = alphabet;
1081         const char *a2d = special;
1082         const char *m2dp = m2d, *a2dp = a2d;
1083         char nice[128];
1084         int h_adj;
1085         int w_adj;
1086         unsigned long flags;
1087         int lut_idx;
1088
1089
1090         if (!omap_dmm) {
1091                 /* early return if dmm/tiler device is not initialized */
1092                 return 0;
1093         }
1094
1095         h_adj = omap_dmm->container_height / ydiv;
1096         w_adj = omap_dmm->container_width / xdiv;
1097
1098         map = kmalloc_array(h_adj, sizeof(*map), GFP_KERNEL);
1099         global_map = kmalloc_array(w_adj + 1, h_adj, GFP_KERNEL);
1100
1101         if (!map || !global_map)
1102                 goto error;
1103
1104         for (lut_idx = 0; lut_idx < omap_dmm->num_lut; lut_idx++) {
1105                 memset(map, 0, h_adj * sizeof(*map));
1106                 memset(global_map, ' ', (w_adj + 1) * h_adj);
1107
1108                 for (i = 0; i < omap_dmm->container_height; i++) {
1109                         map[i] = global_map + i * (w_adj + 1);
1110                         map[i][w_adj] = 0;
1111                 }
1112
1113                 spin_lock_irqsave(&list_lock, flags);
1114
1115                 list_for_each_entry(block, &omap_dmm->alloc_head, alloc_node) {
1116                         if (block->area.tcm == omap_dmm->tcm[lut_idx]) {
1117                                 if (block->fmt != TILFMT_PAGE) {
1118                                         fill_map(map, xdiv, ydiv, &block->area,
1119                                                 *m2dp, true);
1120                                         if (!*++a2dp)
1121                                                 a2dp = a2d;
1122                                         if (!*++m2dp)
1123                                                 m2dp = m2d;
1124                                         map_2d_info(map, xdiv, ydiv, nice,
1125                                                         &block->area);
1126                                 } else {
1127                                         bool start = read_map_pt(map, xdiv,
1128                                                 ydiv, &block->area.p0) == ' ';
1129                                         bool end = read_map_pt(map, xdiv, ydiv,
1130                                                         &block->area.p1) == ' ';
1131
1132                                         tcm_for_each_slice(a, block->area, p)
1133                                                 fill_map(map, xdiv, ydiv, &a,
1134                                                         '=', true);
1135                                         fill_map_pt(map, xdiv, ydiv,
1136                                                         &block->area.p0,
1137                                                         start ? '<' : 'X');
1138                                         fill_map_pt(map, xdiv, ydiv,
1139                                                         &block->area.p1,
1140                                                         end ? '>' : 'X');
1141                                         map_1d_info(map, xdiv, ydiv, nice,
1142                                                         &block->area);
1143                                 }
1144                         }
1145                 }
1146
1147                 spin_unlock_irqrestore(&list_lock, flags);
1148
1149                 if (s) {
1150                         seq_printf(s, "CONTAINER %d DUMP BEGIN\n", lut_idx);
1151                         for (i = 0; i < 128; i++)
1152                                 seq_printf(s, "%03d:%s\n", i, map[i]);
1153                         seq_printf(s, "CONTAINER %d DUMP END\n", lut_idx);
1154                 } else {
1155                         dev_dbg(omap_dmm->dev, "CONTAINER %d DUMP BEGIN\n",
1156                                 lut_idx);
1157                         for (i = 0; i < 128; i++)
1158                                 dev_dbg(omap_dmm->dev, "%03d:%s\n", i, map[i]);
1159                         dev_dbg(omap_dmm->dev, "CONTAINER %d DUMP END\n",
1160                                 lut_idx);
1161                 }
1162         }
1163
1164 error:
1165         kfree(map);
1166         kfree(global_map);
1167
1168         return 0;
1169 }
1170 #endif
1171
1172 #ifdef CONFIG_PM_SLEEP
1173 static int omap_dmm_resume(struct device *dev)
1174 {
1175         struct tcm_area area;
1176         int i;
1177
1178         if (!omap_dmm)
1179                 return -ENODEV;
1180
1181         area = (struct tcm_area) {
1182                 .tcm = NULL,
1183                 .p1.x = omap_dmm->container_width - 1,
1184                 .p1.y = omap_dmm->container_height - 1,
1185         };
1186
1187         /* initialize all LUTs to dummy page entries */
1188         for (i = 0; i < omap_dmm->num_lut; i++) {
1189                 area.tcm = omap_dmm->tcm[i];
1190                 if (fill(&area, NULL, 0, 0, true))
1191                         dev_err(dev, "refill failed");
1192         }
1193
1194         return 0;
1195 }
1196 #endif
1197
1198 static SIMPLE_DEV_PM_OPS(omap_dmm_pm_ops, NULL, omap_dmm_resume);
1199
1200 #if defined(CONFIG_OF)
1201 static const struct dmm_platform_data dmm_omap4_platform_data = {
1202         .cpu_cache_flags = OMAP_BO_WC,
1203 };
1204
1205 static const struct dmm_platform_data dmm_omap5_platform_data = {
1206         .cpu_cache_flags = OMAP_BO_UNCACHED,
1207 };
1208
1209 static const struct of_device_id dmm_of_match[] = {
1210         {
1211                 .compatible = "ti,omap4-dmm",
1212                 .data = &dmm_omap4_platform_data,
1213         },
1214         {
1215                 .compatible = "ti,omap5-dmm",
1216                 .data = &dmm_omap5_platform_data,
1217         },
1218         {},
1219 };
1220 #endif
1221
1222 struct platform_driver omap_dmm_driver = {
1223         .probe = omap_dmm_probe,
1224         .remove = omap_dmm_remove,
1225         .driver = {
1226                 .owner = THIS_MODULE,
1227                 .name = DMM_DRIVER_NAME,
1228                 .of_match_table = of_match_ptr(dmm_of_match),
1229                 .pm = &omap_dmm_pm_ops,
1230         },
1231 };
1232
1233 MODULE_LICENSE("GPL v2");
1234 MODULE_AUTHOR("Andy Gross <[email protected]>");
1235 MODULE_DESCRIPTION("OMAP DMM/Tiler Driver");