drivers/dma/mv_xor.c

   1 /*
   2  * offload engine driver for the Marvell XOR engine
   3  * Copyright (C) 2007, 2008, Marvell International Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/delay.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/memory.h>
  28 #include <plat/mv_xor.h>
  29 #include "mv_xor.h"
  30
  31 static void mv_xor_issue_pending(struct dma_chan *chan);
  32
  33 #define to_mv_xor_chan(chan)            \
  34         container_of(chan, struct mv_xor_chan, common)
  35
  36 #define to_mv_xor_device(dev)           \
  37         container_of(dev, struct mv_xor_device, common)
  38
  39 #define to_mv_xor_slot(tx)              \
  40         container_of(tx, struct mv_xor_desc_slot, async_tx)
  41
  42 static void mv_desc_init(struct mv_xor_desc_slot *desc, unsigned long flags)
  43 {
  44         struct mv_xor_desc *hw_desc = desc->hw_desc;
  45
  46         hw_desc->status = (1 << 31);
  47         hw_desc->phy_next_desc = 0;
  48         hw_desc->desc_command = (1 << 31);
  49 }
  50
  51 static u32 mv_desc_get_dest_addr(struct mv_xor_desc_slot *desc)
  52 {
  53         struct mv_xor_desc *hw_desc = desc->hw_desc;
  54         return hw_desc->phy_dest_addr;
  55 }
  56
  57 static u32 mv_desc_get_src_addr(struct mv_xor_desc_slot *desc,
  58                                 int src_idx)
  59 {
  60         struct mv_xor_desc *hw_desc = desc->hw_desc;
  61         return hw_desc->phy_src_addr[src_idx];
  62 }
  63
  64
  65 static void mv_desc_set_byte_count(struct mv_xor_desc_slot *desc,
  66                                    u32 byte_count)
  67 {
  68         struct mv_xor_desc *hw_desc = desc->hw_desc;
  69         hw_desc->byte_count = byte_count;
  70 }
  71
  72 static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc,
  73                                   u32 next_desc_addr)
  74 {
  75         struct mv_xor_desc *hw_desc = desc->hw_desc;
  76         BUG_ON(hw_desc->phy_next_desc);
  77         hw_desc->phy_next_desc = next_desc_addr;
  78 }
  79
  80 static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc)
  81 {
  82         struct mv_xor_desc *hw_desc = desc->hw_desc;
  83         hw_desc->phy_next_desc = 0;
  84 }
  85
  86 static void mv_desc_set_block_fill_val(struct mv_xor_desc_slot *desc, u32 val)
  87 {
  88         desc->value = val;
  89 }
  90
  91 static void mv_desc_set_dest_addr(struct mv_xor_desc_slot *desc,
  92                                   dma_addr_t addr)
  93 {
  94         struct mv_xor_desc *hw_desc = desc->hw_desc;
  95         hw_desc->phy_dest_addr = addr;
  96 }
  97
  98 static int mv_chan_memset_slot_count(size_t len)
  99 {
 100         return 1;
 101 }
 102
 103 #define mv_chan_memcpy_slot_count(c) mv_chan_memset_slot_count(c)
 104
 105 static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc,
 106                                  int index, dma_addr_t addr)
 107 {
 108         struct mv_xor_desc *hw_desc = desc->hw_desc;
 109         hw_desc->phy_src_addr[index] = addr;
 110         if (desc->type == DMA_XOR)
 111                 hw_desc->desc_command |= (1 << index);
 112 }
 113
 114 static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan)
 115 {
 116         return __raw_readl(XOR_CURR_DESC(chan));
 117 }
 118
 119 static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan,
 120                                         u32 next_desc_addr)
 121 {
 122         __raw_writel(next_desc_addr, XOR_NEXT_DESC(chan));
 123 }
 124
 125 static void mv_chan_set_dest_pointer(struct mv_xor_chan *chan, u32 desc_addr)
 126 {
 127         __raw_writel(desc_addr, XOR_DEST_POINTER(chan));
 128 }
 129
 130 static void mv_chan_set_block_size(struct mv_xor_chan *chan, u32 block_size)
 131 {
 132         __raw_writel(block_size, XOR_BLOCK_SIZE(chan));
 133 }
 134
 135 static void mv_chan_set_value(struct mv_xor_chan *chan, u32 value)
 136 {
 137         __raw_writel(value, XOR_INIT_VALUE_LOW(chan));
 138         __raw_writel(value, XOR_INIT_VALUE_HIGH(chan));
 139 }
 140
 141 static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan)
 142 {
 143         u32 val = __raw_readl(XOR_INTR_MASK(chan));
 144         val |= XOR_INTR_MASK_VALUE << (chan->idx * 16);
 145         __raw_writel(val, XOR_INTR_MASK(chan));
 146 }
 147
 148 static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
 149 {
 150         u32 intr_cause = __raw_readl(XOR_INTR_CAUSE(chan));
 151         intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF;
 152         return intr_cause;
 153 }
 154
 155 static int mv_is_err_intr(u32 intr_cause)
 156 {
 157         if (intr_cause & ((1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)))
 158                 return 1;
 159
 160         return 0;
 161 }
 162
 163 static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
 164 {
 165         u32 val = ~(1 << (chan->idx * 16));
 166         dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val);
 167         __raw_writel(val, XOR_INTR_CAUSE(chan));
 168 }
 169
 170 static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan)
 171 {
 172         u32 val = 0xFFFF0000 >> (chan->idx * 16);
 173         __raw_writel(val, XOR_INTR_CAUSE(chan));
 174 }
 175
 176 static int mv_can_chain(struct mv_xor_desc_slot *desc)
 177 {
 178         struct mv_xor_desc_slot *chain_old_tail = list_entry(
 179                 desc->chain_node.prev, struct mv_xor_desc_slot, chain_node);
 180
 181         if (chain_old_tail->type != desc->type)
 182                 return 0;
 183         if (desc->type == DMA_MEMSET)
 184                 return 0;
 185
 186         return 1;
 187 }
 188
 189 static void mv_set_mode(struct mv_xor_chan *chan,
 190                                enum dma_transaction_type type)
 191 {
 192         u32 op_mode;
 193         u32 config = __raw_readl(XOR_CONFIG(chan));
 194
 195         switch (type) {
 196         case DMA_XOR:
 197                 op_mode = XOR_OPERATION_MODE_XOR;
 198                 break;
 199         case DMA_MEMCPY:
 200                 op_mode = XOR_OPERATION_MODE_MEMCPY;
 201                 break;
 202         case DMA_MEMSET:
 203                 op_mode = XOR_OPERATION_MODE_MEMSET;
 204                 break;
 205         default:
 206                 dev_printk(KERN_ERR, chan->device->common.dev,
 207                            "error: unsupported operation %d.\n",
 208                            type);
 209                 BUG();
 210                 return;
 211         }
 212
 213         config &= ~0x7;
 214         config |= op_mode;
 215         __raw_writel(config, XOR_CONFIG(chan));
 216         chan->current_type = type;
 217 }
 218
 219 static void mv_chan_activate(struct mv_xor_chan *chan)
 220 {
 221         u32 activation;
 222
 223         dev_dbg(chan->device->common.dev, " activate chan.\n");
 224         activation = __raw_readl(XOR_ACTIVATION(chan));
 225         activation |= 0x1;
 226         __raw_writel(activation, XOR_ACTIVATION(chan));
 227 }
 228
 229 static char mv_chan_is_busy(struct mv_xor_chan *chan)
 230 {
 231         u32 state = __raw_readl(XOR_ACTIVATION(chan));
 232
 233         state = (state >> 4) & 0x3;
 234
 235         return (state == 1) ? 1 : 0;
 236 }
 237
 238 static int mv_chan_xor_slot_count(size_t len, int src_cnt)
 239 {
 240         return 1;
 241 }
 242
 243 /**
 244  * mv_xor_free_slots - flags descriptor slots for reuse
 245  * @slot: Slot to free
 246  * Caller must hold &mv_chan->lock while calling this function
 247  */
 248 static void mv_xor_free_slots(struct mv_xor_chan *mv_chan,
 249                               struct mv_xor_desc_slot *slot)
 250 {
 251         dev_dbg(mv_chan->device->common.dev, "%s %d slot %p\n",
 252                 __func__, __LINE__, slot);
 253
 254         slot->slots_per_op = 0;
 255
 256 }
 257
 258 /*
 259  * mv_xor_start_new_chain - program the engine to operate on new chain headed by
 260  * sw_desc
 261  * Caller must hold &mv_chan->lock while calling this function
 262  */
 263 static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan,
 264                                    struct mv_xor_desc_slot *sw_desc)
 265 {
 266         dev_dbg(mv_chan->device->common.dev, "%s %d: sw_desc %p\n",
 267                 __func__, __LINE__, sw_desc);
 268         if (sw_desc->type != mv_chan->current_type)
 269                 mv_set_mode(mv_chan, sw_desc->type);
 270
 271         if (sw_desc->type == DMA_MEMSET) {
 272                 /* for memset requests we need to program the engine, no
 273                  * descriptors used.
 274                  */
 275                 struct mv_xor_desc *hw_desc = sw_desc->hw_desc;
 276                 mv_chan_set_dest_pointer(mv_chan, hw_desc->phy_dest_addr);
 277                 mv_chan_set_block_size(mv_chan, sw_desc->unmap_len);
 278                 mv_chan_set_value(mv_chan, sw_desc->value);
 279         } else {
 280                 /* set the hardware chain */
 281                 mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys);
 282         }
 283         mv_chan->pending += sw_desc->slot_cnt;
 284         mv_xor_issue_pending(&mv_chan->common);
 285 }
 286
 287 static dma_cookie_t
 288 mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
 289         struct mv_xor_chan *mv_chan, dma_cookie_t cookie)
 290 {
 291         BUG_ON(desc->async_tx.cookie < 0);
 292
 293         if (desc->async_tx.cookie > 0) {
 294                 cookie = desc->async_tx.cookie;
 295
 296                 /* call the callback (must not sleep or submit new
 297                  * operations to this channel)
 298                  */
 299                 if (desc->async_tx.callback)
 300                         desc->async_tx.callback(
 301                                 desc->async_tx.callback_param);
 302
 303                 /* unmap dma addresses
 304                  * (unmap_single vs unmap_page?)
 305                  */
 306                 if (desc->group_head && desc->unmap_len) {
 307                         struct mv_xor_desc_slot *unmap = desc->group_head;
 308                         struct device *dev =
 309                                 &mv_chan->device->pdev->dev;
 310                         u32 len = unmap->unmap_len;
 311                         enum dma_ctrl_flags flags = desc->async_tx.flags;
 312                         u32 src_cnt;
 313                         dma_addr_t addr;
 314                         dma_addr_t dest;
 315
 316                         src_cnt = unmap->unmap_src_cnt;
 317                         dest = mv_desc_get_dest_addr(unmap);
 318                         if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
 319                                 enum dma_data_direction dir;
 320
 321                                 if (src_cnt > 1) /* is xor ? */
 322                                         dir = DMA_BIDIRECTIONAL;
 323                                 else
 324                                         dir = DMA_FROM_DEVICE;
 325                                 dma_unmap_page(dev, dest, len, dir);
 326                         }
 327
 328                         if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
 329                                 while (src_cnt--) {
 330                                         addr = mv_desc_get_src_addr(unmap,
 331                                                                     src_cnt);
 332                                         if (addr == dest)
 333                                                 continue;
 334                                         dma_unmap_page(dev, addr, len,
 335                                                        DMA_TO_DEVICE);
 336                                 }
 337                         }
 338                         desc->group_head = NULL;
 339                 }
 340         }
 341
 342         /* run dependent operations */
 343         dma_run_dependencies(&desc->async_tx);
 344
 345         return cookie;
 346 }
 347
 348 static int
 349 mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan)
 350 {
 351         struct mv_xor_desc_slot *iter, *_iter;
 352
 353         dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__);
 354         list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 355                                  completed_node) {
 356
 357                 if (async_tx_test_ack(&iter->async_tx)) {
 358                         list_del(&iter->completed_node);
 359                         mv_xor_free_slots(mv_chan, iter);
 360                 }
 361         }
 362         return 0;
 363 }
 364
 365 static int
 366 mv_xor_clean_slot(struct mv_xor_desc_slot *desc,
 367         struct mv_xor_chan *mv_chan)
 368 {
 369         dev_dbg(mv_chan->device->common.dev, "%s %d: desc %p flags %d\n",
 370                 __func__, __LINE__, desc, desc->async_tx.flags);
 371         list_del(&desc->chain_node);
 372         /* the client is allowed to attach dependent operations
 373          * until 'ack' is set
 374          */
 375         if (!async_tx_test_ack(&desc->async_tx)) {
 376                 /* move this slot to the completed_slots */
 377                 list_add_tail(&desc->completed_node, &mv_chan->completed_slots);
 378                 return 0;
 379         }
 380
 381         mv_xor_free_slots(mv_chan, desc);
 382         return 0;
 383 }
 384
 385 static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 386 {
 387         struct mv_xor_desc_slot *iter, *_iter;
 388         dma_cookie_t cookie = 0;
 389         int busy = mv_chan_is_busy(mv_chan);
 390         u32 current_desc = mv_chan_get_current_desc(mv_chan);
 391         int seen_current = 0;
 392
 393         dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__);
 394         dev_dbg(mv_chan->device->common.dev, "current_desc %x\n", current_desc);
 395         mv_xor_clean_completed_slots(mv_chan);
 396
 397         /* free completed slots from the chain starting with
 398          * the oldest descriptor
 399          */
 400
 401         list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 402                                         chain_node) {
 403                 prefetch(_iter);
 404                 prefetch(&_iter->async_tx);
 405
 406                 /* do not advance past the current descriptor loaded into the
 407                  * hardware channel, subsequent descriptors are either in
 408                  * process or have not been submitted
 409                  */
 410                 if (seen_current)
 411                         break;
 412
 413                 /* stop the search if we reach the current descriptor and the
 414                  * channel is busy
 415                  */
 416                 if (iter->async_tx.phys == current_desc) {
 417                         seen_current = 1;
 418                         if (busy)
 419                                 break;
 420                 }
 421
 422                 cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie);
 423
 424                 if (mv_xor_clean_slot(iter, mv_chan))
 425                         break;
 426         }
 427
 428         if ((busy == 0) && !list_empty(&mv_chan->chain)) {
 429                 struct mv_xor_desc_slot *chain_head;
 430                 chain_head = list_entry(mv_chan->chain.next,
 431                                         struct mv_xor_desc_slot,
 432                                         chain_node);
 433
 434                 mv_xor_start_new_chain(mv_chan, chain_head);
 435         }
 436
 437         if (cookie > 0)
 438                 mv_chan->completed_cookie = cookie;
 439 }
 440
 441 static void
 442 mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 443 {
 444         spin_lock_bh(&mv_chan->lock);
 445         __mv_xor_slot_cleanup(mv_chan);
 446         spin_unlock_bh(&mv_chan->lock);
 447 }
 448
 449 static void mv_xor_tasklet(unsigned long data)
 450 {
 451         struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
 452         mv_xor_slot_cleanup(chan);
 453 }
 454
 455 static struct mv_xor_desc_slot *
 456 mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots,
 457                     int slots_per_op)
 458 {
 459         struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL;
 460         LIST_HEAD(chain);
 461         int slots_found, retry = 0;
 462
 463         /* start search from the last allocated descrtiptor
 464          * if a contiguous allocation can not be found start searching
 465          * from the beginning of the list
 466          */
 467 retry:
 468         slots_found = 0;
 469         if (retry == 0)
 470                 iter = mv_chan->last_used;
 471         else
 472                 iter = list_entry(&mv_chan->all_slots,
 473                         struct mv_xor_desc_slot,
 474                         slot_node);
 475
 476         list_for_each_entry_safe_continue(
 477                 iter, _iter, &mv_chan->all_slots, slot_node) {
 478                 prefetch(_iter);
 479                 prefetch(&_iter->async_tx);
 480                 if (iter->slots_per_op) {
 481                         /* give up after finding the first busy slot
 482                          * on the second pass through the list
 483                          */
 484                         if (retry)
 485                                 break;
 486
 487                         slots_found = 0;
 488                         continue;
 489                 }
 490
 491                 /* start the allocation if the slot is correctly aligned */
 492                 if (!slots_found++)
 493                         alloc_start = iter;
 494
 495                 if (slots_found == num_slots) {
 496                         struct mv_xor_desc_slot *alloc_tail = NULL;
 497                         struct mv_xor_desc_slot *last_used = NULL;
 498                         iter = alloc_start;
 499                         while (num_slots) {
 500                                 int i;
 501
 502                                 /* pre-ack all but the last descriptor */
 503                                 async_tx_ack(&iter->async_tx);
 504
 505                                 list_add_tail(&iter->chain_node, &chain);
 506                                 alloc_tail = iter;
 507                                 iter->async_tx.cookie = 0;
 508                                 iter->slot_cnt = num_slots;
 509                                 iter->xor_check_result = NULL;
 510                                 for (i = 0; i < slots_per_op; i++) {
 511                                         iter->slots_per_op = slots_per_op - i;
 512                                         last_used = iter;
 513                                         iter = list_entry(iter->slot_node.next,
 514                                                 struct mv_xor_desc_slot,
 515                                                 slot_node);
 516                                 }
 517                                 num_slots -= slots_per_op;
 518                         }
 519                         alloc_tail->group_head = alloc_start;
 520                         alloc_tail->async_tx.cookie = -EBUSY;
 521                         list_splice(&chain, &alloc_tail->tx_list);
 522                         mv_chan->last_used = last_used;
 523                         mv_desc_clear_next_desc(alloc_start);
 524                         mv_desc_clear_next_desc(alloc_tail);
 525                         return alloc_tail;
 526                 }
 527         }
 528         if (!retry++)
 529                 goto retry;
 530
 531         /* try to free some slots if the allocation fails */
 532         tasklet_schedule(&mv_chan->irq_tasklet);
 533
 534         return NULL;
 535 }
 536
 537 static dma_cookie_t
 538 mv_desc_assign_cookie(struct mv_xor_chan *mv_chan,
 539                       struct mv_xor_desc_slot *desc)
 540 {
 541         dma_cookie_t cookie = mv_chan->common.cookie;
 542
 543         if (++cookie < 0)
 544                 cookie = 1;
 545         mv_chan->common.cookie = desc->async_tx.cookie = cookie;
 546         return cookie;
 547 }
 548
 549 /************************ DMA engine API functions ****************************/
 550 static dma_cookie_t
 551 mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
 552 {
 553         struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
 554         struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
 555         struct mv_xor_desc_slot *grp_start, *old_chain_tail;
 556         dma_cookie_t cookie;
 557         int new_hw_chain = 1;
 558
 559         dev_dbg(mv_chan->device->common.dev,
 560                 "%s sw_desc %p: async_tx %p\n",
 561                 __func__, sw_desc, &sw_desc->async_tx);
 562
 563         grp_start = sw_desc->group_head;
 564
 565         spin_lock_bh(&mv_chan->lock);
 566         cookie = mv_desc_assign_cookie(mv_chan, sw_desc);
 567
 568         if (list_empty(&mv_chan->chain))
 569                 list_splice_init(&sw_desc->tx_list, &mv_chan->chain);
 570         else {
 571                 new_hw_chain = 0;
 572
 573                 old_chain_tail = list_entry(mv_chan->chain.prev,
 574                                             struct mv_xor_desc_slot,
 575                                             chain_node);
 576                 list_splice_init(&grp_start->tx_list,
 577                                  &old_chain_tail->chain_node);
 578
 579                 if (!mv_can_chain(grp_start))
 580                         goto submit_done;
 581
 582                 dev_dbg(mv_chan->device->common.dev, "Append to last desc %x\n",
 583                         old_chain_tail->async_tx.phys);
 584
 585                 /* fix up the hardware chain */
 586                 mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
 587
 588                 /* if the channel is not busy */
 589                 if (!mv_chan_is_busy(mv_chan)) {
 590                         u32 current_desc = mv_chan_get_current_desc(mv_chan);
 591                         /*
 592                          * and the curren desc is the end of the chain before
 593                          * the append, then we need to start the channel
 594                          */
 595                         if (current_desc == old_chain_tail->async_tx.phys)
 596                                 new_hw_chain = 1;
 597                 }
 598         }
 599
 600         if (new_hw_chain)
 601                 mv_xor_start_new_chain(mv_chan, grp_start);
 602
 603 submit_done:
 604         spin_unlock_bh(&mv_chan->lock);
 605
 606         return cookie;
 607 }
 608
 609 /* returns the number of allocated descriptors */
 610 static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
 611 {
 612         char *hw_desc;
 613         int idx;
 614         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 615         struct mv_xor_desc_slot *slot = NULL;
 616         struct mv_xor_platform_data *plat_data =
 617                 mv_chan->device->pdev->dev.platform_data;
 618         int num_descs_in_pool = plat_data->pool_size/MV_XOR_SLOT_SIZE;
 619
 620         /* Allocate descriptor slots */
 621         idx = mv_chan->slots_allocated;
 622         while (idx < num_descs_in_pool) {
 623                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 624                 if (!slot) {
 625                         printk(KERN_INFO "MV XOR Channel only initialized"
 626                                 " %d descriptor slots", idx);
 627                         break;
 628                 }
 629                 hw_desc = (char *) mv_chan->device->dma_desc_pool_virt;
 630                 slot->hw_desc = (void *) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 631
 632                 dma_async_tx_descriptor_init(&slot->async_tx, chan);
 633                 slot->async_tx.tx_submit = mv_xor_tx_submit;
 634                 INIT_LIST_HEAD(&slot->chain_node);
 635                 INIT_LIST_HEAD(&slot->slot_node);
 636                 INIT_LIST_HEAD(&slot->tx_list);
 637                 hw_desc = (char *) mv_chan->device->dma_desc_pool;
 638                 slot->async_tx.phys =
 639                         (dma_addr_t) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 640                 slot->idx = idx++;
 641
 642                 spin_lock_bh(&mv_chan->lock);
 643                 mv_chan->slots_allocated = idx;
 644                 list_add_tail(&slot->slot_node, &mv_chan->all_slots);
 645                 spin_unlock_bh(&mv_chan->lock);
 646         }
 647
 648         if (mv_chan->slots_allocated && !mv_chan->last_used)
 649                 mv_chan->last_used = list_entry(mv_chan->all_slots.next,
 650                                         struct mv_xor_desc_slot,
 651                                         slot_node);
 652
 653         dev_dbg(mv_chan->device->common.dev,
 654                 "allocated %d descriptor slots last_used: %p\n",
 655                 mv_chan->slots_allocated, mv_chan->last_used);
 656
 657         return mv_chan->slots_allocated ? : -ENOMEM;
 658 }
 659
 660 static struct dma_async_tx_descriptor *
 661 mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 662                 size_t len, unsigned long flags)
 663 {
 664         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 665         struct mv_xor_desc_slot *sw_desc, *grp_start;
 666         int slot_cnt;
 667
 668         dev_dbg(mv_chan->device->common.dev,
 669                 "%s dest: %x src %x len: %u flags: %ld\n",
 670                 __func__, dest, src, len, flags);
 671         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 672                 return NULL;
 673
 674         BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 675
 676         spin_lock_bh(&mv_chan->lock);
 677         slot_cnt = mv_chan_memcpy_slot_count(len);
 678         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 679         if (sw_desc) {
 680                 sw_desc->type = DMA_MEMCPY;
 681                 sw_desc->async_tx.flags = flags;
 682                 grp_start = sw_desc->group_head;
 683                 mv_desc_init(grp_start, flags);
 684                 mv_desc_set_byte_count(grp_start, len);
 685                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 686                 mv_desc_set_src_addr(grp_start, 0, src);
 687                 sw_desc->unmap_src_cnt = 1;
 688                 sw_desc->unmap_len = len;
 689         }
 690         spin_unlock_bh(&mv_chan->lock);
 691
 692         dev_dbg(mv_chan->device->common.dev,
 693                 "%s sw_desc %p async_tx %p\n",
 694                 __func__, sw_desc, sw_desc ? &sw_desc->async_tx : 0);
 695
 696         return sw_desc ? &sw_desc->async_tx : NULL;
 697 }
 698
 699 static struct dma_async_tx_descriptor *
 700 mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
 701                        size_t len, unsigned long flags)
 702 {
 703         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 704         struct mv_xor_desc_slot *sw_desc, *grp_start;
 705         int slot_cnt;
 706
 707         dev_dbg(mv_chan->device->common.dev,
 708                 "%s dest: %x len: %u flags: %ld\n",
 709                 __func__, dest, len, flags);
 710         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 711                 return NULL;
 712
 713         BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 714
 715         spin_lock_bh(&mv_chan->lock);
 716         slot_cnt = mv_chan_memset_slot_count(len);
 717         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 718         if (sw_desc) {
 719                 sw_desc->type = DMA_MEMSET;
 720                 sw_desc->async_tx.flags = flags;
 721                 grp_start = sw_desc->group_head;
 722                 mv_desc_init(grp_start, flags);
 723                 mv_desc_set_byte_count(grp_start, len);
 724                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 725                 mv_desc_set_block_fill_val(grp_start, value);
 726                 sw_desc->unmap_src_cnt = 1;
 727                 sw_desc->unmap_len = len;
 728         }
 729         spin_unlock_bh(&mv_chan->lock);
 730         dev_dbg(mv_chan->device->common.dev,
 731                 "%s sw_desc %p async_tx %p \n",
 732                 __func__, sw_desc, &sw_desc->async_tx);
 733         return sw_desc ? &sw_desc->async_tx : NULL;
 734 }
 735
 736 static struct dma_async_tx_descriptor *
 737 mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 738                     unsigned int src_cnt, size_t len, unsigned long flags)
 739 {
 740         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 741         struct mv_xor_desc_slot *sw_desc, *grp_start;
 742         int slot_cnt;
 743
 744         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 745                 return NULL;
 746
 747         BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 748
 749         dev_dbg(mv_chan->device->common.dev,
 750                 "%s src_cnt: %d len: dest %x %u flags: %ld\n",
 751                 __func__, src_cnt, len, dest, flags);
 752
 753         spin_lock_bh(&mv_chan->lock);
 754         slot_cnt = mv_chan_xor_slot_count(len, src_cnt);
 755         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 756         if (sw_desc) {
 757                 sw_desc->type = DMA_XOR;
 758                 sw_desc->async_tx.flags = flags;
 759                 grp_start = sw_desc->group_head;
 760                 mv_desc_init(grp_start, flags);
 761                 /* the byte count field is the same as in memcpy desc*/
 762                 mv_desc_set_byte_count(grp_start, len);
 763                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 764                 sw_desc->unmap_src_cnt = src_cnt;
 765                 sw_desc->unmap_len = len;
 766                 while (src_cnt--)
 767                         mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]);
 768         }
 769         spin_unlock_bh(&mv_chan->lock);
 770         dev_dbg(mv_chan->device->common.dev,
 771                 "%s sw_desc %p async_tx %p \n",
 772                 __func__, sw_desc, &sw_desc->async_tx);
 773         return sw_desc ? &sw_desc->async_tx : NULL;
 774 }
 775
 776 static void mv_xor_free_chan_resources(struct dma_chan *chan)
 777 {
 778         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 779         struct mv_xor_desc_slot *iter, *_iter;
 780         int in_use_descs = 0;
 781
 782         mv_xor_slot_cleanup(mv_chan);
 783
 784         spin_lock_bh(&mv_chan->lock);
 785         list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 786                                         chain_node) {
 787                 in_use_descs++;
 788                 list_del(&iter->chain_node);
 789         }
 790         list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 791                                  completed_node) {
 792                 in_use_descs++;
 793                 list_del(&iter->completed_node);
 794         }
 795         list_for_each_entry_safe_reverse(
 796                 iter, _iter, &mv_chan->all_slots, slot_node) {
 797                 list_del(&iter->slot_node);
 798                 kfree(iter);
 799                 mv_chan->slots_allocated--;
 800         }
 801         mv_chan->last_used = NULL;
 802
 803         dev_dbg(mv_chan->device->common.dev, "%s slots_allocated %d\n",
 804                 __func__, mv_chan->slots_allocated);
 805         spin_unlock_bh(&mv_chan->lock);
 806
 807         if (in_use_descs)
 808                 dev_err(mv_chan->device->common.dev,
 809                         "freeing %d in use descriptors!\n", in_use_descs);
 810 }
 811
 812 /**
 813  * mv_xor_status - poll the status of an XOR transaction
 814  * @chan: XOR channel handle
 815  * @cookie: XOR transaction identifier
 816  * @txstate: XOR transactions state holder (or NULL)
 817  */
 818 static enum dma_status mv_xor_status(struct dma_chan *chan,
 819                                           dma_cookie_t cookie,
 820                                           struct dma_tx_state *txstate)
 821 {
 822         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 823         dma_cookie_t last_used;
 824         dma_cookie_t last_complete;
 825         enum dma_status ret;
 826
 827         last_used = chan->cookie;
 828         last_complete = mv_chan->completed_cookie;
 829         mv_chan->is_complete_cookie = cookie;
 830         dma_set_tx_state(txstate, last_complete, last_used, 0);
 831
 832         ret = dma_async_is_complete(cookie, last_complete, last_used);
 833         if (ret == DMA_SUCCESS) {
 834                 mv_xor_clean_completed_slots(mv_chan);
 835                 return ret;
 836         }
 837         mv_xor_slot_cleanup(mv_chan);
 838
 839         last_used = chan->cookie;
 840         last_complete = mv_chan->completed_cookie;
 841
 842         dma_set_tx_state(txstate, last_complete, last_used, 0);
 843         return dma_async_is_complete(cookie, last_complete, last_used);
 844 }
 845
 846 static void mv_dump_xor_regs(struct mv_xor_chan *chan)
 847 {
 848         u32 val;
 849
 850         val = __raw_readl(XOR_CONFIG(chan));
 851         dev_printk(KERN_ERR, chan->device->common.dev,
 852                    "config       0x%08x.\n", val);
 853
 854         val = __raw_readl(XOR_ACTIVATION(chan));
 855         dev_printk(KERN_ERR, chan->device->common.dev,
 856                    "activation   0x%08x.\n", val);
 857
 858         val = __raw_readl(XOR_INTR_CAUSE(chan));
 859         dev_printk(KERN_ERR, chan->device->common.dev,
 860                    "intr cause   0x%08x.\n", val);
 861
 862         val = __raw_readl(XOR_INTR_MASK(chan));
 863         dev_printk(KERN_ERR, chan->device->common.dev,
 864                    "intr mask    0x%08x.\n", val);
 865
 866         val = __raw_readl(XOR_ERROR_CAUSE(chan));
 867         dev_printk(KERN_ERR, chan->device->common.dev,
 868                    "error cause  0x%08x.\n", val);
 869
 870         val = __raw_readl(XOR_ERROR_ADDR(chan));
 871         dev_printk(KERN_ERR, chan->device->common.dev,
 872                    "error addr   0x%08x.\n", val);
 873 }
 874
 875 static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan,
 876                                          u32 intr_cause)
 877 {
 878         if (intr_cause & (1 << 4)) {
 879              dev_dbg(chan->device->common.dev,
 880                      "ignore this error\n");
 881              return;
 882         }
 883
 884         dev_printk(KERN_ERR, chan->device->common.dev,
 885                    "error on chan %d. intr cause 0x%08x.\n",
 886                    chan->idx, intr_cause);
 887
 888         mv_dump_xor_regs(chan);
 889         BUG();
 890 }
 891
 892 static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
 893 {
 894         struct mv_xor_chan *chan = data;
 895         u32 intr_cause = mv_chan_get_intr_cause(chan);
 896
 897         dev_dbg(chan->device->common.dev, "intr cause %x\n", intr_cause);
 898
 899         if (mv_is_err_intr(intr_cause))
 900                 mv_xor_err_interrupt_handler(chan, intr_cause);
 901
 902         tasklet_schedule(&chan->irq_tasklet);
 903
 904         mv_xor_device_clear_eoc_cause(chan);
 905
 906         return IRQ_HANDLED;
 907 }
 908
 909 static void mv_xor_issue_pending(struct dma_chan *chan)
 910 {
 911         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 912
 913         if (mv_chan->pending >= MV_XOR_THRESHOLD) {
 914                 mv_chan->pending = 0;
 915                 mv_chan_activate(mv_chan);
 916         }
 917 }
 918
 919 /*
 920  * Perform a transaction to verify the HW works.
 921  */
 922 #define MV_XOR_TEST_SIZE 2000
 923
 924 static int __devinit mv_xor_memcpy_self_test(struct mv_xor_device *device)
 925 {
 926         int i;
 927         void *src, *dest;
 928         dma_addr_t src_dma, dest_dma;
 929         struct dma_chan *dma_chan;
 930         dma_cookie_t cookie;
 931         struct dma_async_tx_descriptor *tx;
 932         int err = 0;
 933         struct mv_xor_chan *mv_chan;
 934
 935         src = kmalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 936         if (!src)
 937                 return -ENOMEM;
 938
 939         dest = kzalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 940         if (!dest) {
 941                 kfree(src);
 942                 return -ENOMEM;
 943         }
 944
 945         /* Fill in src buffer */
 946         for (i = 0; i < MV_XOR_TEST_SIZE; i++)
 947                 ((u8 *) src)[i] = (u8)i;
 948
 949         /* Start copy, using first DMA channel */
 950         dma_chan = container_of(device->common.channels.next,
 951                                 struct dma_chan,
 952                                 device_node);
 953         if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
 954                 err = -ENODEV;
 955                 goto out;
 956         }
 957
 958         dest_dma = dma_map_single(dma_chan->device->dev, dest,
 959                                   MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 960
 961         src_dma = dma_map_single(dma_chan->device->dev, src,
 962                                  MV_XOR_TEST_SIZE, DMA_TO_DEVICE);
 963
 964         tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 965                                     MV_XOR_TEST_SIZE, 0);
 966         cookie = mv_xor_tx_submit(tx);
 967         mv_xor_issue_pending(dma_chan);
 968         async_tx_ack(tx);
 969         msleep(1);
 970
 971         if (mv_xor_status(dma_chan, cookie, NULL) !=
 972             DMA_SUCCESS) {
 973                 dev_printk(KERN_ERR, dma_chan->device->dev,
 974                            "Self-test copy timed out, disabling\n");
 975                 err = -ENODEV;
 976                 goto free_resources;
 977         }
 978
 979         mv_chan = to_mv_xor_chan(dma_chan);
 980         dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma,
 981                                 MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 982         if (memcmp(src, dest, MV_XOR_TEST_SIZE)) {
 983                 dev_printk(KERN_ERR, dma_chan->device->dev,
 984                            "Self-test copy failed compare, disabling\n");
 985                 err = -ENODEV;
 986                 goto free_resources;
 987         }
 988
 989 free_resources:
 990         mv_xor_free_chan_resources(dma_chan);
 991 out:
 992         kfree(src);
 993         kfree(dest);
 994         return err;
 995 }
 996
 997 #define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */
 998 static int __devinit
 999 mv_xor_xor_self_test(struct mv_xor_device *device)
1000 {
1001         int i, src_idx;
1002         struct page *dest;
1003         struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
1004         dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
1005         dma_addr_t dest_dma;
1006         struct dma_async_tx_descriptor *tx;
1007         struct dma_chan *dma_chan;
1008         dma_cookie_t cookie;
1009         u8 cmp_byte = 0;
1010         u32 cmp_word;
1011         int err = 0;
1012         struct mv_xor_chan *mv_chan;
1013
1014         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
1015                 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
1016                 if (!xor_srcs[src_idx]) {
1017                         while (src_idx--)
1018                                 __free_page(xor_srcs[src_idx]);
1019                         return -ENOMEM;
1020                 }
1021         }
1022
1023         dest = alloc_page(GFP_KERNEL);
1024         if (!dest) {
1025                 while (src_idx--)
1026                         __free_page(xor_srcs[src_idx]);
1027                 return -ENOMEM;
1028         }
1029
1030         /* Fill in src buffers */
1031         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
1032                 u8 *ptr = page_address(xor_srcs[src_idx]);
1033                 for (i = 0; i < PAGE_SIZE; i++)
1034                         ptr[i] = (1 << src_idx);
1035         }
1036
1037         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++)
1038                 cmp_byte ^= (u8) (1 << src_idx);
1039
1040         cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
1041                 (cmp_byte << 8) | cmp_byte;
1042
1043         memset(page_address(dest), 0, PAGE_SIZE);
1044
1045         dma_chan = container_of(device->common.channels.next,
1046                                 struct dma_chan,
1047                                 device_node);
1048         if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
1049                 err = -ENODEV;
1050                 goto out;
1051         }
1052
1053         /* test xor */
1054         dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
1055                                 DMA_FROM_DEVICE);
1056
1057         for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++)
1058                 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
1059                                            0, PAGE_SIZE, DMA_TO_DEVICE);
1060
1061         tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
1062                                  MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0);
1063
1064         cookie = mv_xor_tx_submit(tx);
1065         mv_xor_issue_pending(dma_chan);
1066         async_tx_ack(tx);
1067         msleep(8);
1068
1069         if (mv_xor_status(dma_chan, cookie, NULL) !=
1070             DMA_SUCCESS) {
1071                 dev_printk(KERN_ERR, dma_chan->device->dev,
1072                            "Self-test xor timed out, disabling\n");
1073                 err = -ENODEV;
1074                 goto free_resources;
1075         }
1076
1077         mv_chan = to_mv_xor_chan(dma_chan);
1078         dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma,
1079                                 PAGE_SIZE, DMA_FROM_DEVICE);
1080         for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1081                 u32 *ptr = page_address(dest);
1082                 if (ptr[i] != cmp_word) {
1083                         dev_printk(KERN_ERR, dma_chan->device->dev,
1084                                    "Self-test xor failed compare, disabling."
1085                                    " index %d, data %x, expected %x\n", i,
1086                                    ptr[i], cmp_word);
1087                         err = -ENODEV;
1088                         goto free_resources;
1089                 }
1090         }
1091
1092 free_resources:
1093         mv_xor_free_chan_resources(dma_chan);
1094 out:
1095         src_idx = MV_XOR_NUM_SRC_TEST;
1096         while (src_idx--)
1097                 __free_page(xor_srcs[src_idx]);
1098         __free_page(dest);
1099         return err;
1100 }
1101
1102 static int __devexit mv_xor_remove(struct platform_device *dev)
1103 {
1104         struct mv_xor_device *device = platform_get_drvdata(dev);
1105         struct dma_chan *chan, *_chan;
1106         struct mv_xor_chan *mv_chan;
1107         struct mv_xor_platform_data *plat_data = dev->dev.platform_data;
1108
1109         dma_async_device_unregister(&device->common);
1110
1111         dma_free_coherent(&dev->dev, plat_data->pool_size,
1112                         device->dma_desc_pool_virt, device->dma_desc_pool);
1113
1114         list_for_each_entry_safe(chan, _chan, &device->common.channels,
1115                                 device_node) {
1116                 mv_chan = to_mv_xor_chan(chan);
1117                 list_del(&chan->device_node);
1118         }
1119
1120         return 0;
1121 }
1122
1123 static int __devinit mv_xor_probe(struct platform_device *pdev)
1124 {
1125         int ret = 0;
1126         int irq;
1127         struct mv_xor_device *adev;
1128         struct mv_xor_chan *mv_chan;
1129         struct dma_device *dma_dev;
1130         struct mv_xor_platform_data *plat_data = pdev->dev.platform_data;
1131
1132
1133         adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
1134         if (!adev)
1135                 return -ENOMEM;
1136
1137         dma_dev = &adev->common;
1138
1139         /* allocate coherent memory for hardware descriptors
1140          * note: writecombine gives slightly better performance, but
1141          * requires that we explicitly flush the writes
1142          */
1143         adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1144                                                           plat_data->pool_size,
1145                                                           &adev->dma_desc_pool,
1146                                                           GFP_KERNEL);
1147         if (!adev->dma_desc_pool_virt)
1148                 return -ENOMEM;
1149
1150         adev->id = plat_data->hw_id;
1151
1152         /* discover transaction capabilites from the platform data */
1153         dma_dev->cap_mask = plat_data->cap_mask;
1154         adev->pdev = pdev;
1155         platform_set_drvdata(pdev, adev);
1156
1157         adev->shared = platform_get_drvdata(plat_data->shared);
1158
1159         INIT_LIST_HEAD(&dma_dev->channels);
1160
1161         /* set base routines */
1162         dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources;
1163         dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
1164         dma_dev->device_tx_status = mv_xor_status;
1165         dma_dev->device_issue_pending = mv_xor_issue_pending;
1166         dma_dev->dev = &pdev->dev;
1167
1168         /* set prep routines based on capability */
1169         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1170                 dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy;
1171         if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1172                 dma_dev->device_prep_dma_memset = mv_xor_prep_dma_memset;
1173         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1174                 dma_dev->max_xor = 8;
1175                 dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor;
1176         }
1177
1178         mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL);
1179         if (!mv_chan) {
1180                 ret = -ENOMEM;
1181                 goto err_free_dma;
1182         }
1183         mv_chan->device = adev;
1184         mv_chan->idx = plat_data->hw_id;
1185         mv_chan->mmr_base = adev->shared->xor_base;
1186
1187         if (!mv_chan->mmr_base) {
1188                 ret = -ENOMEM;
1189                 goto err_free_dma;
1190         }
1191         tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long)
1192                      mv_chan);
1193
1194         /* clear errors before enabling interrupts */
1195         mv_xor_device_clear_err_status(mv_chan);
1196
1197         irq = platform_get_irq(pdev, 0);
1198         if (irq < 0) {
1199                 ret = irq;
1200                 goto err_free_dma;
1201         }
1202         ret = devm_request_irq(&pdev->dev, irq,
1203                                mv_xor_interrupt_handler,
1204                                0, dev_name(&pdev->dev), mv_chan);
1205         if (ret)
1206                 goto err_free_dma;
1207
1208         mv_chan_unmask_interrupts(mv_chan);
1209
1210         mv_set_mode(mv_chan, DMA_MEMCPY);
1211
1212         spin_lock_init(&mv_chan->lock);
1213         INIT_LIST_HEAD(&mv_chan->chain);
1214         INIT_LIST_HEAD(&mv_chan->completed_slots);
1215         INIT_LIST_HEAD(&mv_chan->all_slots);
1216         mv_chan->common.device = dma_dev;
1217
1218         list_add_tail(&mv_chan->common.device_node, &dma_dev->channels);
1219
1220         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1221                 ret = mv_xor_memcpy_self_test(adev);
1222                 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1223                 if (ret)
1224                         goto err_free_dma;
1225         }
1226
1227         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1228                 ret = mv_xor_xor_self_test(adev);
1229                 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1230                 if (ret)
1231                         goto err_free_dma;
1232         }
1233
1234         dev_printk(KERN_INFO, &pdev->dev, "Marvell XOR: "
1235           "( %s%s%s%s)\n",
1236           dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1237           dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)  ? "fill " : "",
1238           dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1239           dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1240
1241         dma_async_device_register(dma_dev);
1242         goto out;
1243
1244  err_free_dma:
1245         dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1246                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
1247  out:
1248         return ret;
1249 }
1250
1251 static void
1252 mv_xor_conf_mbus_windows(struct mv_xor_shared_private *msp,
1253                          const struct mbus_dram_target_info *dram)
1254 {
1255         void __iomem *base = msp->xor_base;
1256         u32 win_enable = 0;
1257         int i;
1258
1259         for (i = 0; i < 8; i++) {
1260                 writel(0, base + WINDOW_BASE(i));
1261                 writel(0, base + WINDOW_SIZE(i));
1262                 if (i < 4)
1263                         writel(0, base + WINDOW_REMAP_HIGH(i));
1264         }
1265
1266         for (i = 0; i < dram->num_cs; i++) {
1267                 const struct mbus_dram_window *cs = dram->cs + i;
1268
1269                 writel((cs->base & 0xffff0000) |
1270                        (cs->mbus_attr << 8) |
1271                        dram->mbus_dram_target_id, base + WINDOW_BASE(i));
1272                 writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
1273
1274                 win_enable |= (1 << i);
1275                 win_enable |= 3 << (16 + (2 * i));
1276         }
1277
1278         writel(win_enable, base + WINDOW_BAR_ENABLE(0));
1279         writel(win_enable, base + WINDOW_BAR_ENABLE(1));
1280 }
1281
1282 static struct platform_driver mv_xor_driver = {
1283         .probe          = mv_xor_probe,
1284         .remove         = __devexit_p(mv_xor_remove),
1285         .driver         = {
1286                 .owner  = THIS_MODULE,
1287                 .name   = MV_XOR_NAME,
1288         },
1289 };
1290
1291 static int mv_xor_shared_probe(struct platform_device *pdev)
1292 {
1293         const struct mbus_dram_target_info *dram;
1294         struct mv_xor_shared_private *msp;
1295         struct resource *res;
1296
1297         dev_printk(KERN_NOTICE, &pdev->dev, "Marvell shared XOR driver\n");
1298
1299         msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL);
1300         if (!msp)
1301                 return -ENOMEM;
1302
1303         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1304         if (!res)
1305                 return -ENODEV;
1306
1307         msp->xor_base = devm_ioremap(&pdev->dev, res->start,
1308                                      resource_size(res));
1309         if (!msp->xor_base)
1310                 return -EBUSY;
1311
1312         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1313         if (!res)
1314                 return -ENODEV;
1315
1316         msp->xor_high_base = devm_ioremap(&pdev->dev, res->start,
1317                                           resource_size(res));
1318         if (!msp->xor_high_base)
1319                 return -EBUSY;
1320
1321         platform_set_drvdata(pdev, msp);
1322
1323         /*
1324          * (Re-)program MBUS remapping windows if we are asked to.
1325          */
1326         dram = mv_mbus_dram_info();
1327         if (dram)
1328                 mv_xor_conf_mbus_windows(msp, dram);
1329
1330         return 0;
1331 }
1332
1333 static int mv_xor_shared_remove(struct platform_device *pdev)
1334 {
1335         return 0;
1336 }
1337
1338 static struct platform_driver mv_xor_shared_driver = {
1339         .probe          = mv_xor_shared_probe,
1340         .remove         = mv_xor_shared_remove,
1341         .driver         = {
1342                 .owner  = THIS_MODULE,
1343                 .name   = MV_XOR_SHARED_NAME,
1344         },
1345 };
1346
1347
1348 static int __init mv_xor_init(void)
1349 {
1350         int rc;
1351
1352         rc = platform_driver_register(&mv_xor_shared_driver);
1353         if (!rc) {
1354                 rc = platform_driver_register(&mv_xor_driver);
1355                 if (rc)
1356                         platform_driver_unregister(&mv_xor_shared_driver);
1357         }
1358         return rc;
1359 }
1360 module_init(mv_xor_init);
1361
1362 /* it's currently unsafe to unload this module */
1363 #if 0
1364 static void __exit mv_xor_exit(void)
1365 {
1366         platform_driver_unregister(&mv_xor_driver);
1367         platform_driver_unregister(&mv_xor_shared_driver);
1368         return;
1369 }
1370
1371 module_exit(mv_xor_exit);
1372 #endif
1373
1374 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
1375 MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine");
1376 MODULE_LICENSE("GPL");