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/async_tx.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 <asm/plat-orion/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 << (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                         u32 src_cnt = unmap->unmap_src_cnt;
 312                         dma_addr_t addr = mv_desc_get_dest_addr(unmap);
 313
 314                         dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
 315                         while (src_cnt--) {
 316                                 addr = mv_desc_get_src_addr(unmap, src_cnt);
 317                                 dma_unmap_page(dev, addr, len, DMA_TO_DEVICE);
 318                         }
 319                         desc->group_head = NULL;
 320                 }
 321         }
 322
 323         /* run dependent operations */
 324         async_tx_run_dependencies(&desc->async_tx);
 325
 326         return cookie;
 327 }
 328
 329 static int
 330 mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan)
 331 {
 332         struct mv_xor_desc_slot *iter, *_iter;
 333
 334         dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__);
 335         list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 336                                  completed_node) {
 337
 338                 if (async_tx_test_ack(&iter->async_tx)) {
 339                         list_del(&iter->completed_node);
 340                         mv_xor_free_slots(mv_chan, iter);
 341                 }
 342         }
 343         return 0;
 344 }
 345
 346 static int
 347 mv_xor_clean_slot(struct mv_xor_desc_slot *desc,
 348         struct mv_xor_chan *mv_chan)
 349 {
 350         dev_dbg(mv_chan->device->common.dev, "%s %d: desc %p flags %d\n",
 351                 __func__, __LINE__, desc, desc->async_tx.flags);
 352         list_del(&desc->chain_node);
 353         /* the client is allowed to attach dependent operations
 354          * until 'ack' is set
 355          */
 356         if (!async_tx_test_ack(&desc->async_tx)) {
 357                 /* move this slot to the completed_slots */
 358                 list_add_tail(&desc->completed_node, &mv_chan->completed_slots);
 359                 return 0;
 360         }
 361
 362         mv_xor_free_slots(mv_chan, desc);
 363         return 0;
 364 }
 365
 366 static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 367 {
 368         struct mv_xor_desc_slot *iter, *_iter;
 369         dma_cookie_t cookie = 0;
 370         int busy = mv_chan_is_busy(mv_chan);
 371         u32 current_desc = mv_chan_get_current_desc(mv_chan);
 372         int seen_current = 0;
 373
 374         dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__);
 375         dev_dbg(mv_chan->device->common.dev, "current_desc %x\n", current_desc);
 376         mv_xor_clean_completed_slots(mv_chan);
 377
 378         /* free completed slots from the chain starting with
 379          * the oldest descriptor
 380          */
 381
 382         list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 383                                         chain_node) {
 384                 prefetch(_iter);
 385                 prefetch(&_iter->async_tx);
 386
 387                 /* do not advance past the current descriptor loaded into the
 388                  * hardware channel, subsequent descriptors are either in
 389                  * process or have not been submitted
 390                  */
 391                 if (seen_current)
 392                         break;
 393
 394                 /* stop the search if we reach the current descriptor and the
 395                  * channel is busy
 396                  */
 397                 if (iter->async_tx.phys == current_desc) {
 398                         seen_current = 1;
 399                         if (busy)
 400                                 break;
 401                 }
 402
 403                 cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie);
 404
 405                 if (mv_xor_clean_slot(iter, mv_chan))
 406                         break;
 407         }
 408
 409         if ((busy == 0) && !list_empty(&mv_chan->chain)) {
 410                 struct mv_xor_desc_slot *chain_head;
 411                 chain_head = list_entry(mv_chan->chain.next,
 412                                         struct mv_xor_desc_slot,
 413                                         chain_node);
 414
 415                 mv_xor_start_new_chain(mv_chan, chain_head);
 416         }
 417
 418         if (cookie > 0)
 419                 mv_chan->completed_cookie = cookie;
 420 }
 421
 422 static void
 423 mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 424 {
 425         spin_lock_bh(&mv_chan->lock);
 426         __mv_xor_slot_cleanup(mv_chan);
 427         spin_unlock_bh(&mv_chan->lock);
 428 }
 429
 430 static void mv_xor_tasklet(unsigned long data)
 431 {
 432         struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
 433         __mv_xor_slot_cleanup(chan);
 434 }
 435
 436 static struct mv_xor_desc_slot *
 437 mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots,
 438                     int slots_per_op)
 439 {
 440         struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL;
 441         LIST_HEAD(chain);
 442         int slots_found, retry = 0;
 443
 444         /* start search from the last allocated descrtiptor
 445          * if a contiguous allocation can not be found start searching
 446          * from the beginning of the list
 447          */
 448 retry:
 449         slots_found = 0;
 450         if (retry == 0)
 451                 iter = mv_chan->last_used;
 452         else
 453                 iter = list_entry(&mv_chan->all_slots,
 454                         struct mv_xor_desc_slot,
 455                         slot_node);
 456
 457         list_for_each_entry_safe_continue(
 458                 iter, _iter, &mv_chan->all_slots, slot_node) {
 459                 prefetch(_iter);
 460                 prefetch(&_iter->async_tx);
 461                 if (iter->slots_per_op) {
 462                         /* give up after finding the first busy slot
 463                          * on the second pass through the list
 464                          */
 465                         if (retry)
 466                                 break;
 467
 468                         slots_found = 0;
 469                         continue;
 470                 }
 471
 472                 /* start the allocation if the slot is correctly aligned */
 473                 if (!slots_found++)
 474                         alloc_start = iter;
 475
 476                 if (slots_found == num_slots) {
 477                         struct mv_xor_desc_slot *alloc_tail = NULL;
 478                         struct mv_xor_desc_slot *last_used = NULL;
 479                         iter = alloc_start;
 480                         while (num_slots) {
 481                                 int i;
 482
 483                                 /* pre-ack all but the last descriptor */
 484                                 async_tx_ack(&iter->async_tx);
 485
 486                                 list_add_tail(&iter->chain_node, &chain);
 487                                 alloc_tail = iter;
 488                                 iter->async_tx.cookie = 0;
 489                                 iter->slot_cnt = num_slots;
 490                                 iter->xor_check_result = NULL;
 491                                 for (i = 0; i < slots_per_op; i++) {
 492                                         iter->slots_per_op = slots_per_op - i;
 493                                         last_used = iter;
 494                                         iter = list_entry(iter->slot_node.next,
 495                                                 struct mv_xor_desc_slot,
 496                                                 slot_node);
 497                                 }
 498                                 num_slots -= slots_per_op;
 499                         }
 500                         alloc_tail->group_head = alloc_start;
 501                         alloc_tail->async_tx.cookie = -EBUSY;
 502                         list_splice(&chain, &alloc_tail->async_tx.tx_list);
 503                         mv_chan->last_used = last_used;
 504                         mv_desc_clear_next_desc(alloc_start);
 505                         mv_desc_clear_next_desc(alloc_tail);
 506                         return alloc_tail;
 507                 }
 508         }
 509         if (!retry++)
 510                 goto retry;
 511
 512         /* try to free some slots if the allocation fails */
 513         tasklet_schedule(&mv_chan->irq_tasklet);
 514
 515         return NULL;
 516 }
 517
 518 static dma_cookie_t
 519 mv_desc_assign_cookie(struct mv_xor_chan *mv_chan,
 520                       struct mv_xor_desc_slot *desc)
 521 {
 522         dma_cookie_t cookie = mv_chan->common.cookie;
 523
 524         if (++cookie < 0)
 525                 cookie = 1;
 526         mv_chan->common.cookie = desc->async_tx.cookie = cookie;
 527         return cookie;
 528 }
 529
 530 /************************ DMA engine API functions ****************************/
 531 static dma_cookie_t
 532 mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
 533 {
 534         struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
 535         struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
 536         struct mv_xor_desc_slot *grp_start, *old_chain_tail;
 537         dma_cookie_t cookie;
 538         int new_hw_chain = 1;
 539
 540         dev_dbg(mv_chan->device->common.dev,
 541                 "%s sw_desc %p: async_tx %p\n",
 542                 __func__, sw_desc, &sw_desc->async_tx);
 543
 544         grp_start = sw_desc->group_head;
 545
 546         spin_lock_bh(&mv_chan->lock);
 547         cookie = mv_desc_assign_cookie(mv_chan, sw_desc);
 548
 549         if (list_empty(&mv_chan->chain))
 550                 list_splice_init(&sw_desc->async_tx.tx_list, &mv_chan->chain);
 551         else {
 552                 new_hw_chain = 0;
 553
 554                 old_chain_tail = list_entry(mv_chan->chain.prev,
 555                                             struct mv_xor_desc_slot,
 556                                             chain_node);
 557                 list_splice_init(&grp_start->async_tx.tx_list,
 558                                  &old_chain_tail->chain_node);
 559
 560                 if (!mv_can_chain(grp_start))
 561                         goto submit_done;
 562
 563                 dev_dbg(mv_chan->device->common.dev, "Append to last desc %x\n",
 564                         old_chain_tail->async_tx.phys);
 565
 566                 /* fix up the hardware chain */
 567                 mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
 568
 569                 /* if the channel is not busy */
 570                 if (!mv_chan_is_busy(mv_chan)) {
 571                         u32 current_desc = mv_chan_get_current_desc(mv_chan);
 572                         /*
 573                          * and the curren desc is the end of the chain before
 574                          * the append, then we need to start the channel
 575                          */
 576                         if (current_desc == old_chain_tail->async_tx.phys)
 577                                 new_hw_chain = 1;
 578                 }
 579         }
 580
 581         if (new_hw_chain)
 582                 mv_xor_start_new_chain(mv_chan, grp_start);
 583
 584 submit_done:
 585         spin_unlock_bh(&mv_chan->lock);
 586
 587         return cookie;
 588 }
 589
 590 /* returns the number of allocated descriptors */
 591 static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
 592 {
 593         char *hw_desc;
 594         int idx;
 595         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 596         struct mv_xor_desc_slot *slot = NULL;
 597         struct mv_xor_platform_data *plat_data =
 598                 mv_chan->device->pdev->dev.platform_data;
 599         int num_descs_in_pool = plat_data->pool_size/MV_XOR_SLOT_SIZE;
 600
 601         /* Allocate descriptor slots */
 602         idx = mv_chan->slots_allocated;
 603         while (idx < num_descs_in_pool) {
 604                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 605                 if (!slot) {
 606                         printk(KERN_INFO "MV XOR Channel only initialized"
 607                                 " %d descriptor slots", idx);
 608                         break;
 609                 }
 610                 hw_desc = (char *) mv_chan->device->dma_desc_pool_virt;
 611                 slot->hw_desc = (void *) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 612
 613                 dma_async_tx_descriptor_init(&slot->async_tx, chan);
 614                 slot->async_tx.tx_submit = mv_xor_tx_submit;
 615                 INIT_LIST_HEAD(&slot->chain_node);
 616                 INIT_LIST_HEAD(&slot->slot_node);
 617                 INIT_LIST_HEAD(&slot->async_tx.tx_list);
 618                 hw_desc = (char *) mv_chan->device->dma_desc_pool;
 619                 slot->async_tx.phys =
 620                         (dma_addr_t) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 621                 slot->idx = idx++;
 622
 623                 spin_lock_bh(&mv_chan->lock);
 624                 mv_chan->slots_allocated = idx;
 625                 list_add_tail(&slot->slot_node, &mv_chan->all_slots);
 626                 spin_unlock_bh(&mv_chan->lock);
 627         }
 628
 629         if (mv_chan->slots_allocated && !mv_chan->last_used)
 630                 mv_chan->last_used = list_entry(mv_chan->all_slots.next,
 631                                         struct mv_xor_desc_slot,
 632                                         slot_node);
 633
 634         dev_dbg(mv_chan->device->common.dev,
 635                 "allocated %d descriptor slots last_used: %p\n",
 636                 mv_chan->slots_allocated, mv_chan->last_used);
 637
 638         return mv_chan->slots_allocated ? : -ENOMEM;
 639 }
 640
 641 static struct dma_async_tx_descriptor *
 642 mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 643                 size_t len, unsigned long flags)
 644 {
 645         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 646         struct mv_xor_desc_slot *sw_desc, *grp_start;
 647         int slot_cnt;
 648
 649         dev_dbg(mv_chan->device->common.dev,
 650                 "%s dest: %x src %x len: %u flags: %ld\n",
 651                 __func__, dest, src, len, flags);
 652         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 653                 return NULL;
 654
 655         BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
 656
 657         spin_lock_bh(&mv_chan->lock);
 658         slot_cnt = mv_chan_memcpy_slot_count(len);
 659         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 660         if (sw_desc) {
 661                 sw_desc->type = DMA_MEMCPY;
 662                 sw_desc->async_tx.flags = flags;
 663                 grp_start = sw_desc->group_head;
 664                 mv_desc_init(grp_start, flags);
 665                 mv_desc_set_byte_count(grp_start, len);
 666                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 667                 mv_desc_set_src_addr(grp_start, 0, src);
 668                 sw_desc->unmap_src_cnt = 1;
 669                 sw_desc->unmap_len = len;
 670         }
 671         spin_unlock_bh(&mv_chan->lock);
 672
 673         dev_dbg(mv_chan->device->common.dev,
 674                 "%s sw_desc %p async_tx %p\n",
 675                 __func__, sw_desc, sw_desc ? &sw_desc->async_tx : 0);
 676
 677         return sw_desc ? &sw_desc->async_tx : NULL;
 678 }
 679
 680 static struct dma_async_tx_descriptor *
 681 mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
 682                        size_t len, unsigned long flags)
 683 {
 684         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 685         struct mv_xor_desc_slot *sw_desc, *grp_start;
 686         int slot_cnt;
 687
 688         dev_dbg(mv_chan->device->common.dev,
 689                 "%s dest: %x len: %u flags: %ld\n",
 690                 __func__, dest, len, flags);
 691         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 692                 return NULL;
 693
 694         BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
 695
 696         spin_lock_bh(&mv_chan->lock);
 697         slot_cnt = mv_chan_memset_slot_count(len);
 698         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 699         if (sw_desc) {
 700                 sw_desc->type = DMA_MEMSET;
 701                 sw_desc->async_tx.flags = flags;
 702                 grp_start = sw_desc->group_head;
 703                 mv_desc_init(grp_start, flags);
 704                 mv_desc_set_byte_count(grp_start, len);
 705                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 706                 mv_desc_set_block_fill_val(grp_start, value);
 707                 sw_desc->unmap_src_cnt = 1;
 708                 sw_desc->unmap_len = len;
 709         }
 710         spin_unlock_bh(&mv_chan->lock);
 711         dev_dbg(mv_chan->device->common.dev,
 712                 "%s sw_desc %p async_tx %p \n",
 713                 __func__, sw_desc, &sw_desc->async_tx);
 714         return sw_desc ? &sw_desc->async_tx : NULL;
 715 }
 716
 717 static struct dma_async_tx_descriptor *
 718 mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 719                     unsigned int src_cnt, size_t len, unsigned long flags)
 720 {
 721         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 722         struct mv_xor_desc_slot *sw_desc, *grp_start;
 723         int slot_cnt;
 724
 725         if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 726                 return NULL;
 727
 728         BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
 729
 730         dev_dbg(mv_chan->device->common.dev,
 731                 "%s src_cnt: %d len: dest %x %u flags: %ld\n",
 732                 __func__, src_cnt, len, dest, flags);
 733
 734         spin_lock_bh(&mv_chan->lock);
 735         slot_cnt = mv_chan_xor_slot_count(len, src_cnt);
 736         sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 737         if (sw_desc) {
 738                 sw_desc->type = DMA_XOR;
 739                 sw_desc->async_tx.flags = flags;
 740                 grp_start = sw_desc->group_head;
 741                 mv_desc_init(grp_start, flags);
 742                 /* the byte count field is the same as in memcpy desc*/
 743                 mv_desc_set_byte_count(grp_start, len);
 744                 mv_desc_set_dest_addr(sw_desc->group_head, dest);
 745                 sw_desc->unmap_src_cnt = src_cnt;
 746                 sw_desc->unmap_len = len;
 747                 while (src_cnt--)
 748                         mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]);
 749         }
 750         spin_unlock_bh(&mv_chan->lock);
 751         dev_dbg(mv_chan->device->common.dev,
 752                 "%s sw_desc %p async_tx %p \n",
 753                 __func__, sw_desc, &sw_desc->async_tx);
 754         return sw_desc ? &sw_desc->async_tx : NULL;
 755 }
 756
 757 static void mv_xor_free_chan_resources(struct dma_chan *chan)
 758 {
 759         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 760         struct mv_xor_desc_slot *iter, *_iter;
 761         int in_use_descs = 0;
 762
 763         mv_xor_slot_cleanup(mv_chan);
 764
 765         spin_lock_bh(&mv_chan->lock);
 766         list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 767                                         chain_node) {
 768                 in_use_descs++;
 769                 list_del(&iter->chain_node);
 770         }
 771         list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 772                                  completed_node) {
 773                 in_use_descs++;
 774                 list_del(&iter->completed_node);
 775         }
 776         list_for_each_entry_safe_reverse(
 777                 iter, _iter, &mv_chan->all_slots, slot_node) {
 778                 list_del(&iter->slot_node);
 779                 kfree(iter);
 780                 mv_chan->slots_allocated--;
 781         }
 782         mv_chan->last_used = NULL;
 783
 784         dev_dbg(mv_chan->device->common.dev, "%s slots_allocated %d\n",
 785                 __func__, mv_chan->slots_allocated);
 786         spin_unlock_bh(&mv_chan->lock);
 787
 788         if (in_use_descs)
 789                 dev_err(mv_chan->device->common.dev,
 790                         "freeing %d in use descriptors!\n", in_use_descs);
 791 }
 792
 793 /**
 794  * mv_xor_is_complete - poll the status of an XOR transaction
 795  * @chan: XOR channel handle
 796  * @cookie: XOR transaction identifier
 797  */
 798 static enum dma_status mv_xor_is_complete(struct dma_chan *chan,
 799                                           dma_cookie_t cookie,
 800                                           dma_cookie_t *done,
 801                                           dma_cookie_t *used)
 802 {
 803         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 804         dma_cookie_t last_used;
 805         dma_cookie_t last_complete;
 806         enum dma_status ret;
 807
 808         last_used = chan->cookie;
 809         last_complete = mv_chan->completed_cookie;
 810         mv_chan->is_complete_cookie = cookie;
 811         if (done)
 812                 *done = last_complete;
 813         if (used)
 814                 *used = last_used;
 815
 816         ret = dma_async_is_complete(cookie, last_complete, last_used);
 817         if (ret == DMA_SUCCESS) {
 818                 mv_xor_clean_completed_slots(mv_chan);
 819                 return ret;
 820         }
 821         mv_xor_slot_cleanup(mv_chan);
 822
 823         last_used = chan->cookie;
 824         last_complete = mv_chan->completed_cookie;
 825
 826         if (done)
 827                 *done = last_complete;
 828         if (used)
 829                 *used = last_used;
 830
 831         return dma_async_is_complete(cookie, last_complete, last_used);
 832 }
 833
 834 static void mv_dump_xor_regs(struct mv_xor_chan *chan)
 835 {
 836         u32 val;
 837
 838         val = __raw_readl(XOR_CONFIG(chan));
 839         dev_printk(KERN_ERR, chan->device->common.dev,
 840                    "config       0x%08x.\n", val);
 841
 842         val = __raw_readl(XOR_ACTIVATION(chan));
 843         dev_printk(KERN_ERR, chan->device->common.dev,
 844                    "activation   0x%08x.\n", val);
 845
 846         val = __raw_readl(XOR_INTR_CAUSE(chan));
 847         dev_printk(KERN_ERR, chan->device->common.dev,
 848                    "intr cause   0x%08x.\n", val);
 849
 850         val = __raw_readl(XOR_INTR_MASK(chan));
 851         dev_printk(KERN_ERR, chan->device->common.dev,
 852                    "intr mask    0x%08x.\n", val);
 853
 854         val = __raw_readl(XOR_ERROR_CAUSE(chan));
 855         dev_printk(KERN_ERR, chan->device->common.dev,
 856                    "error cause  0x%08x.\n", val);
 857
 858         val = __raw_readl(XOR_ERROR_ADDR(chan));
 859         dev_printk(KERN_ERR, chan->device->common.dev,
 860                    "error addr   0x%08x.\n", val);
 861 }
 862
 863 static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan,
 864                                          u32 intr_cause)
 865 {
 866         if (intr_cause & (1 << 4)) {
 867              dev_dbg(chan->device->common.dev,
 868                      "ignore this error\n");
 869              return;
 870         }
 871
 872         dev_printk(KERN_ERR, chan->device->common.dev,
 873                    "error on chan %d. intr cause 0x%08x.\n",
 874                    chan->idx, intr_cause);
 875
 876         mv_dump_xor_regs(chan);
 877         BUG();
 878 }
 879
 880 static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
 881 {
 882         struct mv_xor_chan *chan = data;
 883         u32 intr_cause = mv_chan_get_intr_cause(chan);
 884
 885         dev_dbg(chan->device->common.dev, "intr cause %x\n", intr_cause);
 886
 887         if (mv_is_err_intr(intr_cause))
 888                 mv_xor_err_interrupt_handler(chan, intr_cause);
 889
 890         tasklet_schedule(&chan->irq_tasklet);
 891
 892         mv_xor_device_clear_eoc_cause(chan);
 893
 894         return IRQ_HANDLED;
 895 }
 896
 897 static void mv_xor_issue_pending(struct dma_chan *chan)
 898 {
 899         struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 900
 901         if (mv_chan->pending >= MV_XOR_THRESHOLD) {
 902                 mv_chan->pending = 0;
 903                 mv_chan_activate(mv_chan);
 904         }
 905 }
 906
 907 /*
 908  * Perform a transaction to verify the HW works.
 909  */
 910 #define MV_XOR_TEST_SIZE 2000
 911
 912 static int __devinit mv_xor_memcpy_self_test(struct mv_xor_device *device)
 913 {
 914         int i;
 915         void *src, *dest;
 916         dma_addr_t src_dma, dest_dma;
 917         struct dma_chan *dma_chan;
 918         dma_cookie_t cookie;
 919         struct dma_async_tx_descriptor *tx;
 920         int err = 0;
 921         struct mv_xor_chan *mv_chan;
 922
 923         src = kmalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 924         if (!src)
 925                 return -ENOMEM;
 926
 927         dest = kzalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 928         if (!dest) {
 929                 kfree(src);
 930                 return -ENOMEM;
 931         }
 932
 933         /* Fill in src buffer */
 934         for (i = 0; i < MV_XOR_TEST_SIZE; i++)
 935                 ((u8 *) src)[i] = (u8)i;
 936
 937         /* Start copy, using first DMA channel */
 938         dma_chan = container_of(device->common.channels.next,
 939                                 struct dma_chan,
 940                                 device_node);
 941         if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
 942                 err = -ENODEV;
 943                 goto out;
 944         }
 945
 946         dest_dma = dma_map_single(dma_chan->device->dev, dest,
 947                                   MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 948
 949         src_dma = dma_map_single(dma_chan->device->dev, src,
 950                                  MV_XOR_TEST_SIZE, DMA_TO_DEVICE);
 951
 952         tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 953                                     MV_XOR_TEST_SIZE, 0);
 954         cookie = mv_xor_tx_submit(tx);
 955         mv_xor_issue_pending(dma_chan);
 956         async_tx_ack(tx);
 957         msleep(1);
 958
 959         if (mv_xor_is_complete(dma_chan, cookie, NULL, NULL) !=
 960             DMA_SUCCESS) {
 961                 dev_printk(KERN_ERR, dma_chan->device->dev,
 962                            "Self-test copy timed out, disabling\n");
 963                 err = -ENODEV;
 964                 goto free_resources;
 965         }
 966
 967         mv_chan = to_mv_xor_chan(dma_chan);
 968         dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma,
 969                                 MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 970         if (memcmp(src, dest, MV_XOR_TEST_SIZE)) {
 971                 dev_printk(KERN_ERR, dma_chan->device->dev,
 972                            "Self-test copy failed compare, disabling\n");
 973                 err = -ENODEV;
 974                 goto free_resources;
 975         }
 976
 977 free_resources:
 978         mv_xor_free_chan_resources(dma_chan);
 979 out:
 980         kfree(src);
 981         kfree(dest);
 982         return err;
 983 }
 984
 985 #define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */
 986 static int __devinit
 987 mv_xor_xor_self_test(struct mv_xor_device *device)
 988 {
 989         int i, src_idx;
 990         struct page *dest;
 991         struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
 992         dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
 993         dma_addr_t dest_dma;
 994         struct dma_async_tx_descriptor *tx;
 995         struct dma_chan *dma_chan;
 996         dma_cookie_t cookie;
 997         u8 cmp_byte = 0;
 998         u32 cmp_word;
 999         int err = 0;
1000         struct mv_xor_chan *mv_chan;
1001
1002         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
1003                 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
1004                 if (!xor_srcs[src_idx])
1005                         while (src_idx--) {
1006                                 __free_page(xor_srcs[src_idx]);
1007                                 return -ENOMEM;
1008                         }
1009         }
1010
1011         dest = alloc_page(GFP_KERNEL);
1012         if (!dest)
1013                 while (src_idx--) {
1014                         __free_page(xor_srcs[src_idx]);
1015                         return -ENOMEM;
1016                 }
1017
1018         /* Fill in src buffers */
1019         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
1020                 u8 *ptr = page_address(xor_srcs[src_idx]);
1021                 for (i = 0; i < PAGE_SIZE; i++)
1022                         ptr[i] = (1 << src_idx);
1023         }
1024
1025         for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++)
1026                 cmp_byte ^= (u8) (1 << src_idx);
1027
1028         cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
1029                 (cmp_byte << 8) | cmp_byte;
1030
1031         memset(page_address(dest), 0, PAGE_SIZE);
1032
1033         dma_chan = container_of(device->common.channels.next,
1034                                 struct dma_chan,
1035                                 device_node);
1036         if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
1037                 err = -ENODEV;
1038                 goto out;
1039         }
1040
1041         /* test xor */
1042         dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
1043                                 DMA_FROM_DEVICE);
1044
1045         for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++)
1046                 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
1047                                            0, PAGE_SIZE, DMA_TO_DEVICE);
1048
1049         tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
1050                                  MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0);
1051
1052         cookie = mv_xor_tx_submit(tx);
1053         mv_xor_issue_pending(dma_chan);
1054         async_tx_ack(tx);
1055         msleep(8);
1056
1057         if (mv_xor_is_complete(dma_chan, cookie, NULL, NULL) !=
1058             DMA_SUCCESS) {
1059                 dev_printk(KERN_ERR, dma_chan->device->dev,
1060                            "Self-test xor timed out, disabling\n");
1061                 err = -ENODEV;
1062                 goto free_resources;
1063         }
1064
1065         mv_chan = to_mv_xor_chan(dma_chan);
1066         dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma,
1067                                 PAGE_SIZE, DMA_FROM_DEVICE);
1068         for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1069                 u32 *ptr = page_address(dest);
1070                 if (ptr[i] != cmp_word) {
1071                         dev_printk(KERN_ERR, dma_chan->device->dev,
1072                                    "Self-test xor failed compare, disabling."
1073                                    " index %d, data %x, expected %x\n", i,
1074                                    ptr[i], cmp_word);
1075                         err = -ENODEV;
1076                         goto free_resources;
1077                 }
1078         }
1079
1080 free_resources:
1081         mv_xor_free_chan_resources(dma_chan);
1082 out:
1083         src_idx = MV_XOR_NUM_SRC_TEST;
1084         while (src_idx--)
1085                 __free_page(xor_srcs[src_idx]);
1086         __free_page(dest);
1087         return err;
1088 }
1089
1090 static int __devexit mv_xor_remove(struct platform_device *dev)
1091 {
1092         struct mv_xor_device *device = platform_get_drvdata(dev);
1093         struct dma_chan *chan, *_chan;
1094         struct mv_xor_chan *mv_chan;
1095         struct mv_xor_platform_data *plat_data = dev->dev.platform_data;
1096
1097         dma_async_device_unregister(&device->common);
1098
1099         dma_free_coherent(&dev->dev, plat_data->pool_size,
1100                         device->dma_desc_pool_virt, device->dma_desc_pool);
1101
1102         list_for_each_entry_safe(chan, _chan, &device->common.channels,
1103                                 device_node) {
1104                 mv_chan = to_mv_xor_chan(chan);
1105                 list_del(&chan->device_node);
1106         }
1107
1108         return 0;
1109 }
1110
1111 static int __devinit mv_xor_probe(struct platform_device *pdev)
1112 {
1113         int ret = 0;
1114         int irq;
1115         struct mv_xor_device *adev;
1116         struct mv_xor_chan *mv_chan;
1117         struct dma_device *dma_dev;
1118         struct mv_xor_platform_data *plat_data = pdev->dev.platform_data;
1119
1120
1121         adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
1122         if (!adev)
1123                 return -ENOMEM;
1124
1125         dma_dev = &adev->common;
1126
1127         /* allocate coherent memory for hardware descriptors
1128          * note: writecombine gives slightly better performance, but
1129          * requires that we explicitly flush the writes
1130          */
1131         adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1132                                                           plat_data->pool_size,
1133                                                           &adev->dma_desc_pool,
1134                                                           GFP_KERNEL);
1135         if (!adev->dma_desc_pool_virt)
1136                 return -ENOMEM;
1137
1138         adev->id = plat_data->hw_id;
1139
1140         /* discover transaction capabilites from the platform data */
1141         dma_dev->cap_mask = plat_data->cap_mask;
1142         adev->pdev = pdev;
1143         platform_set_drvdata(pdev, adev);
1144
1145         adev->shared = platform_get_drvdata(plat_data->shared);
1146
1147         INIT_LIST_HEAD(&dma_dev->channels);
1148
1149         /* set base routines */
1150         dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources;
1151         dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
1152         dma_dev->device_is_tx_complete = mv_xor_is_complete;
1153         dma_dev->device_issue_pending = mv_xor_issue_pending;
1154         dma_dev->dev = &pdev->dev;
1155
1156         /* set prep routines based on capability */
1157         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1158                 dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy;
1159         if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1160                 dma_dev->device_prep_dma_memset = mv_xor_prep_dma_memset;
1161         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1162                 dma_dev->max_xor = 8;                  ;
1163                 dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor;
1164         }
1165
1166         mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL);
1167         if (!mv_chan) {
1168                 ret = -ENOMEM;
1169                 goto err_free_dma;
1170         }
1171         mv_chan->device = adev;
1172         mv_chan->idx = plat_data->hw_id;
1173         mv_chan->mmr_base = adev->shared->xor_base;
1174
1175         if (!mv_chan->mmr_base) {
1176                 ret = -ENOMEM;
1177                 goto err_free_dma;
1178         }
1179         tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long)
1180                      mv_chan);
1181
1182         /* clear errors before enabling interrupts */
1183         mv_xor_device_clear_err_status(mv_chan);
1184
1185         irq = platform_get_irq(pdev, 0);
1186         if (irq < 0) {
1187                 ret = irq;
1188                 goto err_free_dma;
1189         }
1190         ret = devm_request_irq(&pdev->dev, irq,
1191                                mv_xor_interrupt_handler,
1192                                0, dev_name(&pdev->dev), mv_chan);
1193         if (ret)
1194                 goto err_free_dma;
1195
1196         mv_chan_unmask_interrupts(mv_chan);
1197
1198         mv_set_mode(mv_chan, DMA_MEMCPY);
1199
1200         spin_lock_init(&mv_chan->lock);
1201         INIT_LIST_HEAD(&mv_chan->chain);
1202         INIT_LIST_HEAD(&mv_chan->completed_slots);
1203         INIT_LIST_HEAD(&mv_chan->all_slots);
1204         INIT_RCU_HEAD(&mv_chan->common.rcu);
1205         mv_chan->common.device = dma_dev;
1206
1207         list_add_tail(&mv_chan->common.device_node, &dma_dev->channels);
1208
1209         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1210                 ret = mv_xor_memcpy_self_test(adev);
1211                 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1212                 if (ret)
1213                         goto err_free_dma;
1214         }
1215
1216         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1217                 ret = mv_xor_xor_self_test(adev);
1218                 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1219                 if (ret)
1220                         goto err_free_dma;
1221         }
1222
1223         dev_printk(KERN_INFO, &pdev->dev, "Marvell XOR: "
1224           "( %s%s%s%s)\n",
1225           dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1226           dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)  ? "fill " : "",
1227           dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1228           dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1229
1230         dma_async_device_register(dma_dev);
1231         goto out;
1232
1233  err_free_dma:
1234         dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1235                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
1236  out:
1237         return ret;
1238 }
1239
1240 static void
1241 mv_xor_conf_mbus_windows(struct mv_xor_shared_private *msp,
1242                          struct mbus_dram_target_info *dram)
1243 {
1244         void __iomem *base = msp->xor_base;
1245         u32 win_enable = 0;
1246         int i;
1247
1248         for (i = 0; i < 8; i++) {
1249                 writel(0, base + WINDOW_BASE(i));
1250                 writel(0, base + WINDOW_SIZE(i));
1251                 if (i < 4)
1252                         writel(0, base + WINDOW_REMAP_HIGH(i));
1253         }
1254
1255         for (i = 0; i < dram->num_cs; i++) {
1256                 struct mbus_dram_window *cs = dram->cs + i;
1257
1258                 writel((cs->base & 0xffff0000) |
1259                        (cs->mbus_attr << 8) |
1260                        dram->mbus_dram_target_id, base + WINDOW_BASE(i));
1261                 writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
1262
1263                 win_enable |= (1 << i);
1264                 win_enable |= 3 << (16 + (2 * i));
1265         }
1266
1267         writel(win_enable, base + WINDOW_BAR_ENABLE(0));
1268         writel(win_enable, base + WINDOW_BAR_ENABLE(1));
1269 }
1270
1271 static struct platform_driver mv_xor_driver = {
1272         .probe          = mv_xor_probe,
1273         .remove         = mv_xor_remove,
1274         .driver         = {
1275                 .owner  = THIS_MODULE,
1276                 .name   = MV_XOR_NAME,
1277         },
1278 };
1279
1280 static int mv_xor_shared_probe(struct platform_device *pdev)
1281 {
1282         struct mv_xor_platform_shared_data *msd = pdev->dev.platform_data;
1283         struct mv_xor_shared_private *msp;
1284         struct resource *res;
1285
1286         dev_printk(KERN_NOTICE, &pdev->dev, "Marvell shared XOR driver\n");
1287
1288         msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL);
1289         if (!msp)
1290                 return -ENOMEM;
1291
1292         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1293         if (!res)
1294                 return -ENODEV;
1295
1296         msp->xor_base = devm_ioremap(&pdev->dev, res->start,
1297                                      res->end - res->start + 1);
1298         if (!msp->xor_base)
1299                 return -EBUSY;
1300
1301         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1302         if (!res)
1303                 return -ENODEV;
1304
1305         msp->xor_high_base = devm_ioremap(&pdev->dev, res->start,
1306                                           res->end - res->start + 1);
1307         if (!msp->xor_high_base)
1308                 return -EBUSY;
1309
1310         platform_set_drvdata(pdev, msp);
1311
1312         /*
1313          * (Re-)program MBUS remapping windows if we are asked to.
1314          */
1315         if (msd != NULL && msd->dram != NULL)
1316                 mv_xor_conf_mbus_windows(msp, msd->dram);
1317
1318         return 0;
1319 }
1320
1321 static int mv_xor_shared_remove(struct platform_device *pdev)
1322 {
1323         return 0;
1324 }
1325
1326 static struct platform_driver mv_xor_shared_driver = {
1327         .probe          = mv_xor_shared_probe,
1328         .remove         = mv_xor_shared_remove,
1329         .driver         = {
1330                 .owner  = THIS_MODULE,
1331                 .name   = MV_XOR_SHARED_NAME,
1332         },
1333 };
1334
1335
1336 static int __init mv_xor_init(void)
1337 {
1338         int rc;
1339
1340         rc = platform_driver_register(&mv_xor_shared_driver);
1341         if (!rc) {
1342                 rc = platform_driver_register(&mv_xor_driver);
1343                 if (rc)
1344                         platform_driver_unregister(&mv_xor_shared_driver);
1345         }
1346         return rc;
1347 }
1348 module_init(mv_xor_init);
1349
1350 /* it's currently unsafe to unload this module */
1351 #if 0
1352 static void __exit mv_xor_exit(void)
1353 {
1354         platform_driver_unregister(&mv_xor_driver);
1355         platform_driver_unregister(&mv_xor_shared_driver);
1356         return;
1357 }
1358
1359 module_exit(mv_xor_exit);
1360 #endif
1361
1362 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
1363 MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine");
1364 MODULE_LICENSE("GPL");