git.oblomov.eu Git - linux-2.6/blob - drivers/dma/iop-adma.c

   1 /*
   2  * offload engine driver for the Intel Xscale series of i/o processors
   3  * Copyright © 2006, Intel Corporation.
   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
  20 /*
  21  * This driver supports the asynchrounous DMA copy and RAID engines available
  22  * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/async_tx.h>
  28 #include <linux/delay.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/memory.h>
  34 #include <linux/ioport.h>
  35
  36 #include <mach/adma.h>
  37
  38 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
  39 #define to_iop_adma_device(dev) \
  40         container_of(dev, struct iop_adma_device, common)
  41 #define tx_to_iop_adma_slot(tx) \
  42         container_of(tx, struct iop_adma_desc_slot, async_tx)
  43
  44 /**
  45  * iop_adma_free_slots - flags descriptor slots for reuse
  46  * @slot: Slot to free
  47  * Caller must hold &iop_chan->lock while calling this function
  48  */
  49 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
  50 {
  51         int stride = slot->slots_per_op;
  52
  53         while (stride--) {
  54                 slot->slots_per_op = 0;
  55                 slot = list_entry(slot->slot_node.next,
  56                                 struct iop_adma_desc_slot,
  57                                 slot_node);
  58         }
  59 }
  60
  61 static dma_cookie_t
  62 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
  63         struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
  64 {
  65         BUG_ON(desc->async_tx.cookie < 0);
  66         if (desc->async_tx.cookie > 0) {
  67                 cookie = desc->async_tx.cookie;
  68                 desc->async_tx.cookie = 0;
  69
  70                 /* call the callback (must not sleep or submit new
  71                  * operations to this channel)
  72                  */
  73                 if (desc->async_tx.callback)
  74                         desc->async_tx.callback(
  75                                 desc->async_tx.callback_param);
  76
  77                 /* unmap dma addresses
  78                  * (unmap_single vs unmap_page?)
  79                  */
  80                 if (desc->group_head && desc->unmap_len) {
  81                         struct iop_adma_desc_slot *unmap = desc->group_head;
  82                         struct device *dev =
  83                                 &iop_chan->device->pdev->dev;
  84                         u32 len = unmap->unmap_len;
  85                         enum dma_ctrl_flags flags = desc->async_tx.flags;
  86                         u32 src_cnt;
  87                         dma_addr_t addr;
  88
  89                         if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
  90                                 addr = iop_desc_get_dest_addr(unmap, iop_chan);
  91                                 dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
  92                         }
  93
  94                         if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
  95                                 src_cnt = unmap->unmap_src_cnt;
  96                                 while (src_cnt--) {
  97                                         addr = iop_desc_get_src_addr(unmap,
  98                                                                      iop_chan,
  99                                                                      src_cnt);
 100                                         dma_unmap_page(dev, addr, len,
 101                                                        DMA_TO_DEVICE);
 102                                 }
 103                         }
 104                         desc->group_head = NULL;
 105                 }
 106         }
 107
 108         /* run dependent operations */
 109         async_tx_run_dependencies(&desc->async_tx);
 110
 111         return cookie;
 112 }
 113
 114 static int
 115 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
 116         struct iop_adma_chan *iop_chan)
 117 {
 118         /* the client is allowed to attach dependent operations
 119          * until 'ack' is set
 120          */
 121         if (!async_tx_test_ack(&desc->async_tx))
 122                 return 0;
 123
 124         /* leave the last descriptor in the chain
 125          * so we can append to it
 126          */
 127         if (desc->chain_node.next == &iop_chan->chain)
 128                 return 1;
 129
 130         dev_dbg(iop_chan->device->common.dev,
 131                 "\tfree slot: %d slots_per_op: %d\n",
 132                 desc->idx, desc->slots_per_op);
 133
 134         list_del(&desc->chain_node);
 135         iop_adma_free_slots(desc);
 136
 137         return 0;
 138 }
 139
 140 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 141 {
 142         struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
 143         dma_cookie_t cookie = 0;
 144         u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
 145         int busy = iop_chan_is_busy(iop_chan);
 146         int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
 147
 148         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
 149         /* free completed slots from the chain starting with
 150          * the oldest descriptor
 151          */
 152         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
 153                                         chain_node) {
 154                 pr_debug("\tcookie: %d slot: %d busy: %d "
 155                         "this_desc: %#x next_desc: %#x ack: %d\n",
 156                         iter->async_tx.cookie, iter->idx, busy,
 157                         iter->async_tx.phys, iop_desc_get_next_desc(iter),
 158                         async_tx_test_ack(&iter->async_tx));
 159                 prefetch(_iter);
 160                 prefetch(&_iter->async_tx);
 161
 162                 /* do not advance past the current descriptor loaded into the
 163                  * hardware channel, subsequent descriptors are either in
 164                  * process or have not been submitted
 165                  */
 166                 if (seen_current)
 167                         break;
 168
 169                 /* stop the search if we reach the current descriptor and the
 170                  * channel is busy, or if it appears that the current descriptor
 171                  * needs to be re-read (i.e. has been appended to)
 172                  */
 173                 if (iter->async_tx.phys == current_desc) {
 174                         BUG_ON(seen_current++);
 175                         if (busy || iop_desc_get_next_desc(iter))
 176                                 break;
 177                 }
 178
 179                 /* detect the start of a group transaction */
 180                 if (!slot_cnt && !slots_per_op) {
 181                         slot_cnt = iter->slot_cnt;
 182                         slots_per_op = iter->slots_per_op;
 183                         if (slot_cnt <= slots_per_op) {
 184                                 slot_cnt = 0;
 185                                 slots_per_op = 0;
 186                         }
 187                 }
 188
 189                 if (slot_cnt) {
 190                         pr_debug("\tgroup++\n");
 191                         if (!grp_start)
 192                                 grp_start = iter;
 193                         slot_cnt -= slots_per_op;
 194                 }
 195
 196                 /* all the members of a group are complete */
 197                 if (slots_per_op != 0 && slot_cnt == 0) {
 198                         struct iop_adma_desc_slot *grp_iter, *_grp_iter;
 199                         int end_of_chain = 0;
 200                         pr_debug("\tgroup end\n");
 201
 202                         /* collect the total results */
 203                         if (grp_start->xor_check_result) {
 204                                 u32 zero_sum_result = 0;
 205                                 slot_cnt = grp_start->slot_cnt;
 206                                 grp_iter = grp_start;
 207
 208                                 list_for_each_entry_from(grp_iter,
 209                                         &iop_chan->chain, chain_node) {
 210                                         zero_sum_result |=
 211                                             iop_desc_get_zero_result(grp_iter);
 212                                             pr_debug("\titer%d result: %d\n",
 213                                             grp_iter->idx, zero_sum_result);
 214                                         slot_cnt -= slots_per_op;
 215                                         if (slot_cnt == 0)
 216                                                 break;
 217                                 }
 218                                 pr_debug("\tgrp_start->xor_check_result: %p\n",
 219                                         grp_start->xor_check_result);
 220                                 *grp_start->xor_check_result = zero_sum_result;
 221                         }
 222
 223                         /* clean up the group */
 224                         slot_cnt = grp_start->slot_cnt;
 225                         grp_iter = grp_start;
 226                         list_for_each_entry_safe_from(grp_iter, _grp_iter,
 227                                 &iop_chan->chain, chain_node) {
 228                                 cookie = iop_adma_run_tx_complete_actions(
 229                                         grp_iter, iop_chan, cookie);
 230
 231                                 slot_cnt -= slots_per_op;
 232                                 end_of_chain = iop_adma_clean_slot(grp_iter,
 233                                         iop_chan);
 234
 235                                 if (slot_cnt == 0 || end_of_chain)
 236                                         break;
 237                         }
 238
 239                         /* the group should be complete at this point */
 240                         BUG_ON(slot_cnt);
 241
 242                         slots_per_op = 0;
 243                         grp_start = NULL;
 244                         if (end_of_chain)
 245                                 break;
 246                         else
 247                                 continue;
 248                 } else if (slots_per_op) /* wait for group completion */
 249                         continue;
 250
 251                 /* write back zero sum results (single descriptor case) */
 252                 if (iter->xor_check_result && iter->async_tx.cookie)
 253                         *iter->xor_check_result =
 254                                 iop_desc_get_zero_result(iter);
 255
 256                 cookie = iop_adma_run_tx_complete_actions(
 257                                         iter, iop_chan, cookie);
 258
 259                 if (iop_adma_clean_slot(iter, iop_chan))
 260                         break;
 261         }
 262
 263         BUG_ON(!seen_current);
 264
 265         if (cookie > 0) {
 266                 iop_chan->completed_cookie = cookie;
 267                 pr_debug("\tcompleted cookie %d\n", cookie);
 268         }
 269 }
 270
 271 static void
 272 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 273 {
 274         spin_lock_bh(&iop_chan->lock);
 275         __iop_adma_slot_cleanup(iop_chan);
 276         spin_unlock_bh(&iop_chan->lock);
 277 }
 278
 279 static void iop_adma_tasklet(unsigned long data)
 280 {
 281         struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
 282
 283         spin_lock(&iop_chan->lock);
 284         __iop_adma_slot_cleanup(iop_chan);
 285         spin_unlock(&iop_chan->lock);
 286 }
 287
 288 static struct iop_adma_desc_slot *
 289 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
 290                         int slots_per_op)
 291 {
 292         struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
 293         LIST_HEAD(chain);
 294         int slots_found, retry = 0;
 295
 296         /* start search from the last allocated descrtiptor
 297          * if a contiguous allocation can not be found start searching
 298          * from the beginning of the list
 299          */
 300 retry:
 301         slots_found = 0;
 302         if (retry == 0)
 303                 iter = iop_chan->last_used;
 304         else
 305                 iter = list_entry(&iop_chan->all_slots,
 306                         struct iop_adma_desc_slot,
 307                         slot_node);
 308
 309         list_for_each_entry_safe_continue(
 310                 iter, _iter, &iop_chan->all_slots, slot_node) {
 311                 prefetch(_iter);
 312                 prefetch(&_iter->async_tx);
 313                 if (iter->slots_per_op) {
 314                         /* give up after finding the first busy slot
 315                          * on the second pass through the list
 316                          */
 317                         if (retry)
 318                                 break;
 319
 320                         slots_found = 0;
 321                         continue;
 322                 }
 323
 324                 /* start the allocation if the slot is correctly aligned */
 325                 if (!slots_found++) {
 326                         if (iop_desc_is_aligned(iter, slots_per_op))
 327                                 alloc_start = iter;
 328                         else {
 329                                 slots_found = 0;
 330                                 continue;
 331                         }
 332                 }
 333
 334                 if (slots_found == num_slots) {
 335                         struct iop_adma_desc_slot *alloc_tail = NULL;
 336                         struct iop_adma_desc_slot *last_used = NULL;
 337                         iter = alloc_start;
 338                         while (num_slots) {
 339                                 int i;
 340                                 dev_dbg(iop_chan->device->common.dev,
 341                                         "allocated slot: %d "
 342                                         "(desc %p phys: %#x) slots_per_op %d\n",
 343                                         iter->idx, iter->hw_desc,
 344                                         iter->async_tx.phys, slots_per_op);
 345
 346                                 /* pre-ack all but the last descriptor */
 347                                 if (num_slots != slots_per_op)
 348                                         async_tx_ack(&iter->async_tx);
 349
 350                                 list_add_tail(&iter->chain_node, &chain);
 351                                 alloc_tail = iter;
 352                                 iter->async_tx.cookie = 0;
 353                                 iter->slot_cnt = num_slots;
 354                                 iter->xor_check_result = NULL;
 355                                 for (i = 0; i < slots_per_op; i++) {
 356                                         iter->slots_per_op = slots_per_op - i;
 357                                         last_used = iter;
 358                                         iter = list_entry(iter->slot_node.next,
 359                                                 struct iop_adma_desc_slot,
 360                                                 slot_node);
 361                                 }
 362                                 num_slots -= slots_per_op;
 363                         }
 364                         alloc_tail->group_head = alloc_start;
 365                         alloc_tail->async_tx.cookie = -EBUSY;
 366                         list_splice(&chain, &alloc_tail->async_tx.tx_list);
 367                         iop_chan->last_used = last_used;
 368                         iop_desc_clear_next_desc(alloc_start);
 369                         iop_desc_clear_next_desc(alloc_tail);
 370                         return alloc_tail;
 371                 }
 372         }
 373         if (!retry++)
 374                 goto retry;
 375
 376         /* perform direct reclaim if the allocation fails */
 377         __iop_adma_slot_cleanup(iop_chan);
 378
 379         return NULL;
 380 }
 381
 382 static dma_cookie_t
 383 iop_desc_assign_cookie(struct iop_adma_chan *iop_chan,
 384         struct iop_adma_desc_slot *desc)
 385 {
 386         dma_cookie_t cookie = iop_chan->common.cookie;
 387         cookie++;
 388         if (cookie < 0)
 389                 cookie = 1;
 390         iop_chan->common.cookie = desc->async_tx.cookie = cookie;
 391         return cookie;
 392 }
 393
 394 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
 395 {
 396         dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
 397                 iop_chan->pending);
 398
 399         if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
 400                 iop_chan->pending = 0;
 401                 iop_chan_append(iop_chan);
 402         }
 403 }
 404
 405 static dma_cookie_t
 406 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
 407 {
 408         struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
 409         struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
 410         struct iop_adma_desc_slot *grp_start, *old_chain_tail;
 411         int slot_cnt;
 412         int slots_per_op;
 413         dma_cookie_t cookie;
 414
 415         grp_start = sw_desc->group_head;
 416         slot_cnt = grp_start->slot_cnt;
 417         slots_per_op = grp_start->slots_per_op;
 418
 419         spin_lock_bh(&iop_chan->lock);
 420         cookie = iop_desc_assign_cookie(iop_chan, sw_desc);
 421
 422         old_chain_tail = list_entry(iop_chan->chain.prev,
 423                 struct iop_adma_desc_slot, chain_node);
 424         list_splice_init(&sw_desc->async_tx.tx_list,
 425                          &old_chain_tail->chain_node);
 426
 427         /* fix up the hardware chain */
 428         iop_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
 429
 430         /* 1/ don't add pre-chained descriptors
 431          * 2/ dummy read to flush next_desc write
 432          */
 433         BUG_ON(iop_desc_get_next_desc(sw_desc));
 434
 435         /* increment the pending count by the number of slots
 436          * memcpy operations have a 1:1 (slot:operation) relation
 437          * other operations are heavier and will pop the threshold
 438          * more often.
 439          */
 440         iop_chan->pending += slot_cnt;
 441         iop_adma_check_threshold(iop_chan);
 442         spin_unlock_bh(&iop_chan->lock);
 443
 444         dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
 445                 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
 446
 447         return cookie;
 448 }
 449
 450 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
 451 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
 452
 453 /**
 454  * iop_adma_alloc_chan_resources -  returns the number of allocated descriptors
 455  * @chan - allocate descriptor resources for this channel
 456  * @client - current client requesting the channel be ready for requests
 457  *
 458  * Note: We keep the slots for 1 operation on iop_chan->chain at all times.  To
 459  * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
 460  * greater than 2x the number slots needed to satisfy a device->max_xor
 461  * request.
 462  * */
 463 static int iop_adma_alloc_chan_resources(struct dma_chan *chan,
 464                                          struct dma_client *client)
 465 {
 466         char *hw_desc;
 467         int idx;
 468         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 469         struct iop_adma_desc_slot *slot = NULL;
 470         int init = iop_chan->slots_allocated ? 0 : 1;
 471         struct iop_adma_platform_data *plat_data =
 472                 iop_chan->device->pdev->dev.platform_data;
 473         int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
 474
 475         /* Allocate descriptor slots */
 476         do {
 477                 idx = iop_chan->slots_allocated;
 478                 if (idx == num_descs_in_pool)
 479                         break;
 480
 481                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 482                 if (!slot) {
 483                         printk(KERN_INFO "IOP ADMA Channel only initialized"
 484                                 " %d descriptor slots", idx);
 485                         break;
 486                 }
 487                 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
 488                 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
 489
 490                 dma_async_tx_descriptor_init(&slot->async_tx, chan);
 491                 slot->async_tx.tx_submit = iop_adma_tx_submit;
 492                 INIT_LIST_HEAD(&slot->chain_node);
 493                 INIT_LIST_HEAD(&slot->slot_node);
 494                 INIT_LIST_HEAD(&slot->async_tx.tx_list);
 495                 hw_desc = (char *) iop_chan->device->dma_desc_pool;
 496                 slot->async_tx.phys =
 497                         (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
 498                 slot->idx = idx;
 499
 500                 spin_lock_bh(&iop_chan->lock);
 501                 iop_chan->slots_allocated++;
 502                 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
 503                 spin_unlock_bh(&iop_chan->lock);
 504         } while (iop_chan->slots_allocated < num_descs_in_pool);
 505
 506         if (idx && !iop_chan->last_used)
 507                 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
 508                                         struct iop_adma_desc_slot,
 509                                         slot_node);
 510
 511         dev_dbg(iop_chan->device->common.dev,
 512                 "allocated %d descriptor slots last_used: %p\n",
 513                 iop_chan->slots_allocated, iop_chan->last_used);
 514
 515         /* initialize the channel and the chain with a null operation */
 516         if (init) {
 517                 if (dma_has_cap(DMA_MEMCPY,
 518                         iop_chan->device->common.cap_mask))
 519                         iop_chan_start_null_memcpy(iop_chan);
 520                 else if (dma_has_cap(DMA_XOR,
 521                         iop_chan->device->common.cap_mask))
 522                         iop_chan_start_null_xor(iop_chan);
 523                 else
 524                         BUG();
 525         }
 526
 527         return (idx > 0) ? idx : -ENOMEM;
 528 }
 529
 530 static struct dma_async_tx_descriptor *
 531 iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
 532 {
 533         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 534         struct iop_adma_desc_slot *sw_desc, *grp_start;
 535         int slot_cnt, slots_per_op;
 536
 537         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
 538
 539         spin_lock_bh(&iop_chan->lock);
 540         slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
 541         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 542         if (sw_desc) {
 543                 grp_start = sw_desc->group_head;
 544                 iop_desc_init_interrupt(grp_start, iop_chan);
 545                 grp_start->unmap_len = 0;
 546                 sw_desc->async_tx.flags = flags;
 547         }
 548         spin_unlock_bh(&iop_chan->lock);
 549
 550         return sw_desc ? &sw_desc->async_tx : NULL;
 551 }
 552
 553 static struct dma_async_tx_descriptor *
 554 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
 555                          dma_addr_t dma_src, size_t len, unsigned long flags)
 556 {
 557         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 558         struct iop_adma_desc_slot *sw_desc, *grp_start;
 559         int slot_cnt, slots_per_op;
 560
 561         if (unlikely(!len))
 562                 return NULL;
 563         BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
 564
 565         dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
 566                 __func__, len);
 567
 568         spin_lock_bh(&iop_chan->lock);
 569         slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
 570         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 571         if (sw_desc) {
 572                 grp_start = sw_desc->group_head;
 573                 iop_desc_init_memcpy(grp_start, flags);
 574                 iop_desc_set_byte_count(grp_start, iop_chan, len);
 575                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 576                 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
 577                 sw_desc->unmap_src_cnt = 1;
 578                 sw_desc->unmap_len = len;
 579                 sw_desc->async_tx.flags = flags;
 580         }
 581         spin_unlock_bh(&iop_chan->lock);
 582
 583         return sw_desc ? &sw_desc->async_tx : NULL;
 584 }
 585
 586 static struct dma_async_tx_descriptor *
 587 iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
 588                          int value, size_t len, unsigned long flags)
 589 {
 590         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 591         struct iop_adma_desc_slot *sw_desc, *grp_start;
 592         int slot_cnt, slots_per_op;
 593
 594         if (unlikely(!len))
 595                 return NULL;
 596         BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
 597
 598         dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
 599                 __func__, len);
 600
 601         spin_lock_bh(&iop_chan->lock);
 602         slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op);
 603         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 604         if (sw_desc) {
 605                 grp_start = sw_desc->group_head;
 606                 iop_desc_init_memset(grp_start, flags);
 607                 iop_desc_set_byte_count(grp_start, iop_chan, len);
 608                 iop_desc_set_block_fill_val(grp_start, value);
 609                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 610                 sw_desc->unmap_src_cnt = 1;
 611                 sw_desc->unmap_len = len;
 612                 sw_desc->async_tx.flags = flags;
 613         }
 614         spin_unlock_bh(&iop_chan->lock);
 615
 616         return sw_desc ? &sw_desc->async_tx : NULL;
 617 }
 618
 619 static struct dma_async_tx_descriptor *
 620 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
 621                       dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
 622                       unsigned long flags)
 623 {
 624         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 625         struct iop_adma_desc_slot *sw_desc, *grp_start;
 626         int slot_cnt, slots_per_op;
 627
 628         if (unlikely(!len))
 629                 return NULL;
 630         BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
 631
 632         dev_dbg(iop_chan->device->common.dev,
 633                 "%s src_cnt: %d len: %u flags: %lx\n",
 634                 __func__, src_cnt, len, flags);
 635
 636         spin_lock_bh(&iop_chan->lock);
 637         slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
 638         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 639         if (sw_desc) {
 640                 grp_start = sw_desc->group_head;
 641                 iop_desc_init_xor(grp_start, src_cnt, flags);
 642                 iop_desc_set_byte_count(grp_start, iop_chan, len);
 643                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 644                 sw_desc->unmap_src_cnt = src_cnt;
 645                 sw_desc->unmap_len = len;
 646                 sw_desc->async_tx.flags = flags;
 647                 while (src_cnt--)
 648                         iop_desc_set_xor_src_addr(grp_start, src_cnt,
 649                                                   dma_src[src_cnt]);
 650         }
 651         spin_unlock_bh(&iop_chan->lock);
 652
 653         return sw_desc ? &sw_desc->async_tx : NULL;
 654 }
 655
 656 static struct dma_async_tx_descriptor *
 657 iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
 658                            unsigned int src_cnt, size_t len, u32 *result,
 659                            unsigned long flags)
 660 {
 661         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 662         struct iop_adma_desc_slot *sw_desc, *grp_start;
 663         int slot_cnt, slots_per_op;
 664
 665         if (unlikely(!len))
 666                 return NULL;
 667
 668         dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
 669                 __func__, src_cnt, len);
 670
 671         spin_lock_bh(&iop_chan->lock);
 672         slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
 673         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 674         if (sw_desc) {
 675                 grp_start = sw_desc->group_head;
 676                 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
 677                 iop_desc_set_zero_sum_byte_count(grp_start, len);
 678                 grp_start->xor_check_result = result;
 679                 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
 680                         __func__, grp_start->xor_check_result);
 681                 sw_desc->unmap_src_cnt = src_cnt;
 682                 sw_desc->unmap_len = len;
 683                 sw_desc->async_tx.flags = flags;
 684                 while (src_cnt--)
 685                         iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
 686                                                        dma_src[src_cnt]);
 687         }
 688         spin_unlock_bh(&iop_chan->lock);
 689
 690         return sw_desc ? &sw_desc->async_tx : NULL;
 691 }
 692
 693 static void iop_adma_free_chan_resources(struct dma_chan *chan)
 694 {
 695         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 696         struct iop_adma_desc_slot *iter, *_iter;
 697         int in_use_descs = 0;
 698
 699         iop_adma_slot_cleanup(iop_chan);
 700
 701         spin_lock_bh(&iop_chan->lock);
 702         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
 703                                         chain_node) {
 704                 in_use_descs++;
 705                 list_del(&iter->chain_node);
 706         }
 707         list_for_each_entry_safe_reverse(
 708                 iter, _iter, &iop_chan->all_slots, slot_node) {
 709                 list_del(&iter->slot_node);
 710                 kfree(iter);
 711                 iop_chan->slots_allocated--;
 712         }
 713         iop_chan->last_used = NULL;
 714
 715         dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
 716                 __func__, iop_chan->slots_allocated);
 717         spin_unlock_bh(&iop_chan->lock);
 718
 719         /* one is ok since we left it on there on purpose */
 720         if (in_use_descs > 1)
 721                 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
 722                         in_use_descs - 1);
 723 }
 724
 725 /**
 726  * iop_adma_is_complete - poll the status of an ADMA transaction
 727  * @chan: ADMA channel handle
 728  * @cookie: ADMA transaction identifier
 729  */
 730 static enum dma_status iop_adma_is_complete(struct dma_chan *chan,
 731                                         dma_cookie_t cookie,
 732                                         dma_cookie_t *done,
 733                                         dma_cookie_t *used)
 734 {
 735         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 736         dma_cookie_t last_used;
 737         dma_cookie_t last_complete;
 738         enum dma_status ret;
 739
 740         last_used = chan->cookie;
 741         last_complete = iop_chan->completed_cookie;
 742
 743         if (done)
 744                 *done = last_complete;
 745         if (used)
 746                 *used = last_used;
 747
 748         ret = dma_async_is_complete(cookie, last_complete, last_used);
 749         if (ret == DMA_SUCCESS)
 750                 return ret;
 751
 752         iop_adma_slot_cleanup(iop_chan);
 753
 754         last_used = chan->cookie;
 755         last_complete = iop_chan->completed_cookie;
 756
 757         if (done)
 758                 *done = last_complete;
 759         if (used)
 760                 *used = last_used;
 761
 762         return dma_async_is_complete(cookie, last_complete, last_used);
 763 }
 764
 765 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
 766 {
 767         struct iop_adma_chan *chan = data;
 768
 769         dev_dbg(chan->device->common.dev, "%s\n", __func__);
 770
 771         tasklet_schedule(&chan->irq_tasklet);
 772
 773         iop_adma_device_clear_eot_status(chan);
 774
 775         return IRQ_HANDLED;
 776 }
 777
 778 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
 779 {
 780         struct iop_adma_chan *chan = data;
 781
 782         dev_dbg(chan->device->common.dev, "%s\n", __func__);
 783
 784         tasklet_schedule(&chan->irq_tasklet);
 785
 786         iop_adma_device_clear_eoc_status(chan);
 787
 788         return IRQ_HANDLED;
 789 }
 790
 791 static irqreturn_t iop_adma_err_handler(int irq, void *data)
 792 {
 793         struct iop_adma_chan *chan = data;
 794         unsigned long status = iop_chan_get_status(chan);
 795
 796         dev_printk(KERN_ERR, chan->device->common.dev,
 797                 "error ( %s%s%s%s%s%s%s)\n",
 798                 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
 799                 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
 800                 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
 801                 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
 802                 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
 803                 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
 804                 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
 805
 806         iop_adma_device_clear_err_status(chan);
 807
 808         BUG();
 809
 810         return IRQ_HANDLED;
 811 }
 812
 813 static void iop_adma_issue_pending(struct dma_chan *chan)
 814 {
 815         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 816
 817         if (iop_chan->pending) {
 818                 iop_chan->pending = 0;
 819                 iop_chan_append(iop_chan);
 820         }
 821 }
 822
 823 /*
 824  * Perform a transaction to verify the HW works.
 825  */
 826 #define IOP_ADMA_TEST_SIZE 2000
 827
 828 static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device)
 829 {
 830         int i;
 831         void *src, *dest;
 832         dma_addr_t src_dma, dest_dma;
 833         struct dma_chan *dma_chan;
 834         dma_cookie_t cookie;
 835         struct dma_async_tx_descriptor *tx;
 836         int err = 0;
 837         struct iop_adma_chan *iop_chan;
 838
 839         dev_dbg(device->common.dev, "%s\n", __func__);
 840
 841         src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
 842         if (!src)
 843                 return -ENOMEM;
 844         dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
 845         if (!dest) {
 846                 kfree(src);
 847                 return -ENOMEM;
 848         }
 849
 850         /* Fill in src buffer */
 851         for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
 852                 ((u8 *) src)[i] = (u8)i;
 853
 854         /* Start copy, using first DMA channel */
 855         dma_chan = container_of(device->common.channels.next,
 856                                 struct dma_chan,
 857                                 device_node);
 858         if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
 859                 err = -ENODEV;
 860                 goto out;
 861         }
 862
 863         dest_dma = dma_map_single(dma_chan->device->dev, dest,
 864                                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
 865         src_dma = dma_map_single(dma_chan->device->dev, src,
 866                                 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
 867         tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 868                                       IOP_ADMA_TEST_SIZE,
 869                                       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 870
 871         cookie = iop_adma_tx_submit(tx);
 872         iop_adma_issue_pending(dma_chan);
 873         msleep(1);
 874
 875         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
 876                         DMA_SUCCESS) {
 877                 dev_printk(KERN_ERR, dma_chan->device->dev,
 878                         "Self-test copy timed out, disabling\n");
 879                 err = -ENODEV;
 880                 goto free_resources;
 881         }
 882
 883         iop_chan = to_iop_adma_chan(dma_chan);
 884         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
 885                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
 886         if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
 887                 dev_printk(KERN_ERR, dma_chan->device->dev,
 888                         "Self-test copy failed compare, disabling\n");
 889                 err = -ENODEV;
 890                 goto free_resources;
 891         }
 892
 893 free_resources:
 894         iop_adma_free_chan_resources(dma_chan);
 895 out:
 896         kfree(src);
 897         kfree(dest);
 898         return err;
 899 }
 900
 901 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
 902 static int __devinit
 903 iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device)
 904 {
 905         int i, src_idx;
 906         struct page *dest;
 907         struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
 908         struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
 909         dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
 910         dma_addr_t dma_addr, dest_dma;
 911         struct dma_async_tx_descriptor *tx;
 912         struct dma_chan *dma_chan;
 913         dma_cookie_t cookie;
 914         u8 cmp_byte = 0;
 915         u32 cmp_word;
 916         u32 zero_sum_result;
 917         int err = 0;
 918         struct iop_adma_chan *iop_chan;
 919
 920         dev_dbg(device->common.dev, "%s\n", __func__);
 921
 922         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
 923                 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
 924                 if (!xor_srcs[src_idx])
 925                         while (src_idx--) {
 926                                 __free_page(xor_srcs[src_idx]);
 927                                 return -ENOMEM;
 928                         }
 929         }
 930
 931         dest = alloc_page(GFP_KERNEL);
 932         if (!dest)
 933                 while (src_idx--) {
 934                         __free_page(xor_srcs[src_idx]);
 935                         return -ENOMEM;
 936                 }
 937
 938         /* Fill in src buffers */
 939         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
 940                 u8 *ptr = page_address(xor_srcs[src_idx]);
 941                 for (i = 0; i < PAGE_SIZE; i++)
 942                         ptr[i] = (1 << src_idx);
 943         }
 944
 945         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
 946                 cmp_byte ^= (u8) (1 << src_idx);
 947
 948         cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
 949                         (cmp_byte << 8) | cmp_byte;
 950
 951         memset(page_address(dest), 0, PAGE_SIZE);
 952
 953         dma_chan = container_of(device->common.channels.next,
 954                                 struct dma_chan,
 955                                 device_node);
 956         if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
 957                 err = -ENODEV;
 958                 goto out;
 959         }
 960
 961         /* test xor */
 962         dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
 963                                 PAGE_SIZE, DMA_FROM_DEVICE);
 964         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
 965                 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
 966                                            0, PAGE_SIZE, DMA_TO_DEVICE);
 967         tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
 968                                    IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
 969                                    DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 970
 971         cookie = iop_adma_tx_submit(tx);
 972         iop_adma_issue_pending(dma_chan);
 973         msleep(8);
 974
 975         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
 976                 DMA_SUCCESS) {
 977                 dev_printk(KERN_ERR, dma_chan->device->dev,
 978                         "Self-test xor timed out, disabling\n");
 979                 err = -ENODEV;
 980                 goto free_resources;
 981         }
 982
 983         iop_chan = to_iop_adma_chan(dma_chan);
 984         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
 985                 PAGE_SIZE, DMA_FROM_DEVICE);
 986         for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
 987                 u32 *ptr = page_address(dest);
 988                 if (ptr[i] != cmp_word) {
 989                         dev_printk(KERN_ERR, dma_chan->device->dev,
 990                                 "Self-test xor failed compare, disabling\n");
 991                         err = -ENODEV;
 992                         goto free_resources;
 993                 }
 994         }
 995         dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
 996                 PAGE_SIZE, DMA_TO_DEVICE);
 997
 998         /* skip zero sum if the capability is not present */
 999         if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask))
1000                 goto free_resources;
1001
1002         /* zero sum the sources with the destintation page */
1003         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1004                 zero_sum_srcs[i] = xor_srcs[i];
1005         zero_sum_srcs[i] = dest;
1006
1007         zero_sum_result = 1;
1008
1009         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1010                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1011                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1012                                            DMA_TO_DEVICE);
1013         tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1014                                         IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1015                                         &zero_sum_result,
1016                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1017
1018         cookie = iop_adma_tx_submit(tx);
1019         iop_adma_issue_pending(dma_chan);
1020         msleep(8);
1021
1022         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1023                 dev_printk(KERN_ERR, dma_chan->device->dev,
1024                         "Self-test zero sum timed out, disabling\n");
1025                 err = -ENODEV;
1026                 goto free_resources;
1027         }
1028
1029         if (zero_sum_result != 0) {
1030                 dev_printk(KERN_ERR, dma_chan->device->dev,
1031                         "Self-test zero sum failed compare, disabling\n");
1032                 err = -ENODEV;
1033                 goto free_resources;
1034         }
1035
1036         /* test memset */
1037         dma_addr = dma_map_page(dma_chan->device->dev, dest, 0,
1038                         PAGE_SIZE, DMA_FROM_DEVICE);
1039         tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
1040                                       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1041
1042         cookie = iop_adma_tx_submit(tx);
1043         iop_adma_issue_pending(dma_chan);
1044         msleep(8);
1045
1046         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1047                 dev_printk(KERN_ERR, dma_chan->device->dev,
1048                         "Self-test memset timed out, disabling\n");
1049                 err = -ENODEV;
1050                 goto free_resources;
1051         }
1052
1053         for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) {
1054                 u32 *ptr = page_address(dest);
1055                 if (ptr[i]) {
1056                         dev_printk(KERN_ERR, dma_chan->device->dev,
1057                                 "Self-test memset failed compare, disabling\n");
1058                         err = -ENODEV;
1059                         goto free_resources;
1060                 }
1061         }
1062
1063         /* test for non-zero parity sum */
1064         zero_sum_result = 0;
1065         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1066                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1067                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1068                                            DMA_TO_DEVICE);
1069         tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1070                                         IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1071                                         &zero_sum_result,
1072                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1073
1074         cookie = iop_adma_tx_submit(tx);
1075         iop_adma_issue_pending(dma_chan);
1076         msleep(8);
1077
1078         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1079                 dev_printk(KERN_ERR, dma_chan->device->dev,
1080                         "Self-test non-zero sum timed out, disabling\n");
1081                 err = -ENODEV;
1082                 goto free_resources;
1083         }
1084
1085         if (zero_sum_result != 1) {
1086                 dev_printk(KERN_ERR, dma_chan->device->dev,
1087                         "Self-test non-zero sum failed compare, disabling\n");
1088                 err = -ENODEV;
1089                 goto free_resources;
1090         }
1091
1092 free_resources:
1093         iop_adma_free_chan_resources(dma_chan);
1094 out:
1095         src_idx = IOP_ADMA_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 iop_adma_remove(struct platform_device *dev)
1103 {
1104         struct iop_adma_device *device = platform_get_drvdata(dev);
1105         struct dma_chan *chan, *_chan;
1106         struct iop_adma_chan *iop_chan;
1107         int i;
1108         struct iop_adma_platform_data *plat_data = dev->dev.platform_data;
1109
1110         dma_async_device_unregister(&device->common);
1111
1112         for (i = 0; i < 3; i++) {
1113                 unsigned int irq;
1114                 irq = platform_get_irq(dev, i);
1115                 free_irq(irq, device);
1116         }
1117
1118         dma_free_coherent(&dev->dev, plat_data->pool_size,
1119                         device->dma_desc_pool_virt, device->dma_desc_pool);
1120
1121         do {
1122                 struct resource *res;
1123                 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1124                 release_mem_region(res->start, res->end - res->start);
1125         } while (0);
1126
1127         list_for_each_entry_safe(chan, _chan, &device->common.channels,
1128                                 device_node) {
1129                 iop_chan = to_iop_adma_chan(chan);
1130                 list_del(&chan->device_node);
1131                 kfree(iop_chan);
1132         }
1133         kfree(device);
1134
1135         return 0;
1136 }
1137
1138 static int __devinit iop_adma_probe(struct platform_device *pdev)
1139 {
1140         struct resource *res;
1141         int ret = 0, i;
1142         struct iop_adma_device *adev;
1143         struct iop_adma_chan *iop_chan;
1144         struct dma_device *dma_dev;
1145         struct iop_adma_platform_data *plat_data = pdev->dev.platform_data;
1146
1147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1148         if (!res)
1149                 return -ENODEV;
1150
1151         if (!devm_request_mem_region(&pdev->dev, res->start,
1152                                 res->end - res->start, pdev->name))
1153                 return -EBUSY;
1154
1155         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1156         if (!adev)
1157                 return -ENOMEM;
1158         dma_dev = &adev->common;
1159
1160         /* allocate coherent memory for hardware descriptors
1161          * note: writecombine gives slightly better performance, but
1162          * requires that we explicitly flush the writes
1163          */
1164         if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1165                                         plat_data->pool_size,
1166                                         &adev->dma_desc_pool,
1167                                         GFP_KERNEL)) == NULL) {
1168                 ret = -ENOMEM;
1169                 goto err_free_adev;
1170         }
1171
1172         dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n",
1173                 __func__, adev->dma_desc_pool_virt,
1174                 (void *) adev->dma_desc_pool);
1175
1176         adev->id = plat_data->hw_id;
1177
1178         /* discover transaction capabilites from the platform data */
1179         dma_dev->cap_mask = plat_data->cap_mask;
1180
1181         adev->pdev = pdev;
1182         platform_set_drvdata(pdev, adev);
1183
1184         INIT_LIST_HEAD(&dma_dev->channels);
1185
1186         /* set base routines */
1187         dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1188         dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1189         dma_dev->device_is_tx_complete = iop_adma_is_complete;
1190         dma_dev->device_issue_pending = iop_adma_issue_pending;
1191         dma_dev->dev = &pdev->dev;
1192
1193         /* set prep routines based on capability */
1194         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1195                 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1196         if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1197                 dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset;
1198         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1199                 dma_dev->max_xor = iop_adma_get_max_xor();
1200                 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1201         }
1202         if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask))
1203                 dma_dev->device_prep_dma_zero_sum =
1204                         iop_adma_prep_dma_zero_sum;
1205         if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1206                 dma_dev->device_prep_dma_interrupt =
1207                         iop_adma_prep_dma_interrupt;
1208
1209         iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1210         if (!iop_chan) {
1211                 ret = -ENOMEM;
1212                 goto err_free_dma;
1213         }
1214         iop_chan->device = adev;
1215
1216         iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1217                                         res->end - res->start);
1218         if (!iop_chan->mmr_base) {
1219                 ret = -ENOMEM;
1220                 goto err_free_iop_chan;
1221         }
1222         tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1223                 iop_chan);
1224
1225         /* clear errors before enabling interrupts */
1226         iop_adma_device_clear_err_status(iop_chan);
1227
1228         for (i = 0; i < 3; i++) {
1229                 irq_handler_t handler[] = { iop_adma_eot_handler,
1230                                         iop_adma_eoc_handler,
1231                                         iop_adma_err_handler };
1232                 int irq = platform_get_irq(pdev, i);
1233                 if (irq < 0) {
1234                         ret = -ENXIO;
1235                         goto err_free_iop_chan;
1236                 } else {
1237                         ret = devm_request_irq(&pdev->dev, irq,
1238                                         handler[i], 0, pdev->name, iop_chan);
1239                         if (ret)
1240                                 goto err_free_iop_chan;
1241                 }
1242         }
1243
1244         spin_lock_init(&iop_chan->lock);
1245         INIT_LIST_HEAD(&iop_chan->chain);
1246         INIT_LIST_HEAD(&iop_chan->all_slots);
1247         INIT_RCU_HEAD(&iop_chan->common.rcu);
1248         iop_chan->common.device = dma_dev;
1249         list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1250
1251         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1252                 ret = iop_adma_memcpy_self_test(adev);
1253                 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1254                 if (ret)
1255                         goto err_free_iop_chan;
1256         }
1257
1258         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) ||
1259                 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1260                 ret = iop_adma_xor_zero_sum_self_test(adev);
1261                 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1262                 if (ret)
1263                         goto err_free_iop_chan;
1264         }
1265
1266         dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: "
1267           "( %s%s%s%s%s%s%s%s%s%s)\n",
1268           dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "",
1269           dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "",
1270           dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "",
1271           dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1272           dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "",
1273           dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "",
1274           dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)  ? "fill " : "",
1275           dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "",
1276           dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1277           dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1278
1279         dma_async_device_register(dma_dev);
1280         goto out;
1281
1282  err_free_iop_chan:
1283         kfree(iop_chan);
1284  err_free_dma:
1285         dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1286                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
1287  err_free_adev:
1288         kfree(adev);
1289  out:
1290         return ret;
1291 }
1292
1293 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1294 {
1295         struct iop_adma_desc_slot *sw_desc, *grp_start;
1296         dma_cookie_t cookie;
1297         int slot_cnt, slots_per_op;
1298
1299         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1300
1301         spin_lock_bh(&iop_chan->lock);
1302         slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1303         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1304         if (sw_desc) {
1305                 grp_start = sw_desc->group_head;
1306
1307                 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1308                 async_tx_ack(&sw_desc->async_tx);
1309                 iop_desc_init_memcpy(grp_start, 0);
1310                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1311                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1312                 iop_desc_set_memcpy_src_addr(grp_start, 0);
1313
1314                 cookie = iop_chan->common.cookie;
1315                 cookie++;
1316                 if (cookie <= 1)
1317                         cookie = 2;
1318
1319                 /* initialize the completed cookie to be less than
1320                  * the most recently used cookie
1321                  */
1322                 iop_chan->completed_cookie = cookie - 1;
1323                 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1324
1325                 /* channel should not be busy */
1326                 BUG_ON(iop_chan_is_busy(iop_chan));
1327
1328                 /* clear any prior error-status bits */
1329                 iop_adma_device_clear_err_status(iop_chan);
1330
1331                 /* disable operation */
1332                 iop_chan_disable(iop_chan);
1333
1334                 /* set the descriptor address */
1335                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1336
1337                 /* 1/ don't add pre-chained descriptors
1338                  * 2/ dummy read to flush next_desc write
1339                  */
1340                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1341
1342                 /* run the descriptor */
1343                 iop_chan_enable(iop_chan);
1344         } else
1345                 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1346                          "failed to allocate null descriptor\n");
1347         spin_unlock_bh(&iop_chan->lock);
1348 }
1349
1350 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1351 {
1352         struct iop_adma_desc_slot *sw_desc, *grp_start;
1353         dma_cookie_t cookie;
1354         int slot_cnt, slots_per_op;
1355
1356         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1357
1358         spin_lock_bh(&iop_chan->lock);
1359         slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1360         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1361         if (sw_desc) {
1362                 grp_start = sw_desc->group_head;
1363                 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1364                 async_tx_ack(&sw_desc->async_tx);
1365                 iop_desc_init_null_xor(grp_start, 2, 0);
1366                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1367                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1368                 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1369                 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1370
1371                 cookie = iop_chan->common.cookie;
1372                 cookie++;
1373                 if (cookie <= 1)
1374                         cookie = 2;
1375
1376                 /* initialize the completed cookie to be less than
1377                  * the most recently used cookie
1378                  */
1379                 iop_chan->completed_cookie = cookie - 1;
1380                 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1381
1382                 /* channel should not be busy */
1383                 BUG_ON(iop_chan_is_busy(iop_chan));
1384
1385                 /* clear any prior error-status bits */
1386                 iop_adma_device_clear_err_status(iop_chan);
1387
1388                 /* disable operation */
1389                 iop_chan_disable(iop_chan);
1390
1391                 /* set the descriptor address */
1392                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1393
1394                 /* 1/ don't add pre-chained descriptors
1395                  * 2/ dummy read to flush next_desc write
1396                  */
1397                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1398
1399                 /* run the descriptor */
1400                 iop_chan_enable(iop_chan);
1401         } else
1402                 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1403                         "failed to allocate null descriptor\n");
1404         spin_unlock_bh(&iop_chan->lock);
1405 }
1406
1407 MODULE_ALIAS("platform:iop-adma");
1408
1409 static struct platform_driver iop_adma_driver = {
1410         .probe          = iop_adma_probe,
1411         .remove         = iop_adma_remove,
1412         .driver         = {
1413                 .owner  = THIS_MODULE,
1414                 .name   = "iop-adma",
1415         },
1416 };
1417
1418 static int __init iop_adma_init (void)
1419 {
1420         return platform_driver_register(&iop_adma_driver);
1421 }
1422
1423 /* it's currently unsafe to unload this module */
1424 #if 0
1425 static void __exit iop_adma_exit (void)
1426 {
1427         platform_driver_unregister(&iop_adma_driver);
1428         return;
1429 }
1430 module_exit(iop_adma_exit);
1431 #endif
1432
1433 module_init(iop_adma_init);
1434
1435 MODULE_AUTHOR("Intel Corporation");
1436 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1437 MODULE_LICENSE("GPL");