drivers/net/wireless/ath/ath10k/ce.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "hif.h"
  19 #include "pci.h"
  20 #include "ce.h"
  21 #include "debug.h"
  22
  23 /*
  24  * Support for Copy Engine hardware, which is mainly used for
  25  * communication between Host and Target over a PCIe interconnect.
  26  */
  27
  28 /*
  29  * A single CopyEngine (CE) comprises two "rings":
  30  *   a source ring
  31  *   a destination ring
  32  *
  33  * Each ring consists of a number of descriptors which specify
  34  * an address, length, and meta-data.
  35  *
  36  * Typically, one side of the PCIe interconnect (Host or Target)
  37  * controls one ring and the other side controls the other ring.
  38  * The source side chooses when to initiate a transfer and it
  39  * chooses what to send (buffer address, length). The destination
  40  * side keeps a supply of "anonymous receive buffers" available and
  41  * it handles incoming data as it arrives (when the destination
  42  * recieves an interrupt).
  43  *
  44  * The sender may send a simple buffer (address/length) or it may
  45  * send a small list of buffers.  When a small list is sent, hardware
  46  * "gathers" these and they end up in a single destination buffer
  47  * with a single interrupt.
  48  *
  49  * There are several "contexts" managed by this layer -- more, it
  50  * may seem -- than should be needed. These are provided mainly for
  51  * maximum flexibility and especially to facilitate a simpler HIF
  52  * implementation. There are per-CopyEngine recv, send, and watermark
  53  * contexts. These are supplied by the caller when a recv, send,
  54  * or watermark handler is established and they are echoed back to
  55  * the caller when the respective callbacks are invoked. There is
  56  * also a per-transfer context supplied by the caller when a buffer
  57  * (or sendlist) is sent and when a buffer is enqueued for recv.
  58  * These per-transfer contexts are echoed back to the caller when
  59  * the buffer is sent/received.
  60  */
  61
  62 static inline void ath10k_ce_dest_ring_write_index_set(struct ath10k *ar,
  63                                                        u32 ce_ctrl_addr,
  64                                                        unsigned int n)
  65 {
  66         ath10k_pci_write32(ar, ce_ctrl_addr + DST_WR_INDEX_ADDRESS, n);
  67 }
  68
  69 static inline u32 ath10k_ce_dest_ring_write_index_get(struct ath10k *ar,
  70                                                       u32 ce_ctrl_addr)
  71 {
  72         return ath10k_pci_read32(ar, ce_ctrl_addr + DST_WR_INDEX_ADDRESS);
  73 }
  74
  75 static inline void ath10k_ce_src_ring_write_index_set(struct ath10k *ar,
  76                                                       u32 ce_ctrl_addr,
  77                                                       unsigned int n)
  78 {
  79         ath10k_pci_write32(ar, ce_ctrl_addr + SR_WR_INDEX_ADDRESS, n);
  80 }
  81
  82 static inline u32 ath10k_ce_src_ring_write_index_get(struct ath10k *ar,
  83                                                      u32 ce_ctrl_addr)
  84 {
  85         return ath10k_pci_read32(ar, ce_ctrl_addr + SR_WR_INDEX_ADDRESS);
  86 }
  87
  88 static inline u32 ath10k_ce_src_ring_read_index_get(struct ath10k *ar,
  89                                                     u32 ce_ctrl_addr)
  90 {
  91         return ath10k_pci_read32(ar, ce_ctrl_addr + CURRENT_SRRI_ADDRESS);
  92 }
  93
  94 static inline void ath10k_ce_src_ring_base_addr_set(struct ath10k *ar,
  95                                                     u32 ce_ctrl_addr,
  96                                                     unsigned int addr)
  97 {
  98         ath10k_pci_write32(ar, ce_ctrl_addr + SR_BA_ADDRESS, addr);
  99 }
 100
 101 static inline void ath10k_ce_src_ring_size_set(struct ath10k *ar,
 102                                                u32 ce_ctrl_addr,
 103                                                unsigned int n)
 104 {
 105         ath10k_pci_write32(ar, ce_ctrl_addr + SR_SIZE_ADDRESS, n);
 106 }
 107
 108 static inline void ath10k_ce_src_ring_dmax_set(struct ath10k *ar,
 109                                                u32 ce_ctrl_addr,
 110                                                unsigned int n)
 111 {
 112         u32 ctrl1_addr = ath10k_pci_read32((ar),
 113                                            (ce_ctrl_addr) + CE_CTRL1_ADDRESS);
 114
 115         ath10k_pci_write32(ar, ce_ctrl_addr + CE_CTRL1_ADDRESS,
 116                            (ctrl1_addr &  ~CE_CTRL1_DMAX_LENGTH_MASK) |
 117                            CE_CTRL1_DMAX_LENGTH_SET(n));
 118 }
 119
 120 static inline void ath10k_ce_src_ring_byte_swap_set(struct ath10k *ar,
 121                                                     u32 ce_ctrl_addr,
 122                                                     unsigned int n)
 123 {
 124         u32 ctrl1_addr = ath10k_pci_read32(ar, ce_ctrl_addr + CE_CTRL1_ADDRESS);
 125
 126         ath10k_pci_write32(ar, ce_ctrl_addr + CE_CTRL1_ADDRESS,
 127                            (ctrl1_addr & ~CE_CTRL1_SRC_RING_BYTE_SWAP_EN_MASK) |
 128                            CE_CTRL1_SRC_RING_BYTE_SWAP_EN_SET(n));
 129 }
 130
 131 static inline void ath10k_ce_dest_ring_byte_swap_set(struct ath10k *ar,
 132                                                      u32 ce_ctrl_addr,
 133                                                      unsigned int n)
 134 {
 135         u32 ctrl1_addr = ath10k_pci_read32(ar, ce_ctrl_addr + CE_CTRL1_ADDRESS);
 136
 137         ath10k_pci_write32(ar, ce_ctrl_addr + CE_CTRL1_ADDRESS,
 138                            (ctrl1_addr & ~CE_CTRL1_DST_RING_BYTE_SWAP_EN_MASK) |
 139                            CE_CTRL1_DST_RING_BYTE_SWAP_EN_SET(n));
 140 }
 141
 142 static inline u32 ath10k_ce_dest_ring_read_index_get(struct ath10k *ar,
 143                                                      u32 ce_ctrl_addr)
 144 {
 145         return ath10k_pci_read32(ar, ce_ctrl_addr + CURRENT_DRRI_ADDRESS);
 146 }
 147
 148 static inline void ath10k_ce_dest_ring_base_addr_set(struct ath10k *ar,
 149                                                      u32 ce_ctrl_addr,
 150                                                      u32 addr)
 151 {
 152         ath10k_pci_write32(ar, ce_ctrl_addr + DR_BA_ADDRESS, addr);
 153 }
 154
 155 static inline void ath10k_ce_dest_ring_size_set(struct ath10k *ar,
 156                                                 u32 ce_ctrl_addr,
 157                                                 unsigned int n)
 158 {
 159         ath10k_pci_write32(ar, ce_ctrl_addr + DR_SIZE_ADDRESS, n);
 160 }
 161
 162 static inline void ath10k_ce_src_ring_highmark_set(struct ath10k *ar,
 163                                                    u32 ce_ctrl_addr,
 164                                                    unsigned int n)
 165 {
 166         u32 addr = ath10k_pci_read32(ar, ce_ctrl_addr + SRC_WATERMARK_ADDRESS);
 167
 168         ath10k_pci_write32(ar, ce_ctrl_addr + SRC_WATERMARK_ADDRESS,
 169                            (addr & ~SRC_WATERMARK_HIGH_MASK) |
 170                            SRC_WATERMARK_HIGH_SET(n));
 171 }
 172
 173 static inline void ath10k_ce_src_ring_lowmark_set(struct ath10k *ar,
 174                                                   u32 ce_ctrl_addr,
 175                                                   unsigned int n)
 176 {
 177         u32 addr = ath10k_pci_read32(ar, ce_ctrl_addr + SRC_WATERMARK_ADDRESS);
 178
 179         ath10k_pci_write32(ar, ce_ctrl_addr + SRC_WATERMARK_ADDRESS,
 180                            (addr & ~SRC_WATERMARK_LOW_MASK) |
 181                            SRC_WATERMARK_LOW_SET(n));
 182 }
 183
 184 static inline void ath10k_ce_dest_ring_highmark_set(struct ath10k *ar,
 185                                                     u32 ce_ctrl_addr,
 186                                                     unsigned int n)
 187 {
 188         u32 addr = ath10k_pci_read32(ar, ce_ctrl_addr + DST_WATERMARK_ADDRESS);
 189
 190         ath10k_pci_write32(ar, ce_ctrl_addr + DST_WATERMARK_ADDRESS,
 191                            (addr & ~DST_WATERMARK_HIGH_MASK) |
 192                            DST_WATERMARK_HIGH_SET(n));
 193 }
 194
 195 static inline void ath10k_ce_dest_ring_lowmark_set(struct ath10k *ar,
 196                                                    u32 ce_ctrl_addr,
 197                                                    unsigned int n)
 198 {
 199         u32 addr = ath10k_pci_read32(ar, ce_ctrl_addr + DST_WATERMARK_ADDRESS);
 200
 201         ath10k_pci_write32(ar, ce_ctrl_addr + DST_WATERMARK_ADDRESS,
 202                            (addr & ~DST_WATERMARK_LOW_MASK) |
 203                            DST_WATERMARK_LOW_SET(n));
 204 }
 205
 206 static inline void ath10k_ce_copy_complete_inter_enable(struct ath10k *ar,
 207                                                         u32 ce_ctrl_addr)
 208 {
 209         u32 host_ie_addr = ath10k_pci_read32(ar,
 210                                              ce_ctrl_addr + HOST_IE_ADDRESS);
 211
 212         ath10k_pci_write32(ar, ce_ctrl_addr + HOST_IE_ADDRESS,
 213                            host_ie_addr | HOST_IE_COPY_COMPLETE_MASK);
 214 }
 215
 216 static inline void ath10k_ce_copy_complete_intr_disable(struct ath10k *ar,
 217                                                         u32 ce_ctrl_addr)
 218 {
 219         u32 host_ie_addr = ath10k_pci_read32(ar,
 220                                              ce_ctrl_addr + HOST_IE_ADDRESS);
 221
 222         ath10k_pci_write32(ar, ce_ctrl_addr + HOST_IE_ADDRESS,
 223                            host_ie_addr & ~HOST_IE_COPY_COMPLETE_MASK);
 224 }
 225
 226 static inline void ath10k_ce_watermark_intr_disable(struct ath10k *ar,
 227                                                     u32 ce_ctrl_addr)
 228 {
 229         u32 host_ie_addr = ath10k_pci_read32(ar,
 230                                              ce_ctrl_addr + HOST_IE_ADDRESS);
 231
 232         ath10k_pci_write32(ar, ce_ctrl_addr + HOST_IE_ADDRESS,
 233                            host_ie_addr & ~CE_WATERMARK_MASK);
 234 }
 235
 236 static inline void ath10k_ce_error_intr_enable(struct ath10k *ar,
 237                                                u32 ce_ctrl_addr)
 238 {
 239         u32 misc_ie_addr = ath10k_pci_read32(ar,
 240                                              ce_ctrl_addr + MISC_IE_ADDRESS);
 241
 242         ath10k_pci_write32(ar, ce_ctrl_addr + MISC_IE_ADDRESS,
 243                            misc_ie_addr | CE_ERROR_MASK);
 244 }
 245
 246 static inline void ath10k_ce_engine_int_status_clear(struct ath10k *ar,
 247                                                      u32 ce_ctrl_addr,
 248                                                      unsigned int mask)
 249 {
 250         ath10k_pci_write32(ar, ce_ctrl_addr + HOST_IS_ADDRESS, mask);
 251 }
 252
 253
 254 /*
 255  * Guts of ath10k_ce_send, used by both ath10k_ce_send and
 256  * ath10k_ce_sendlist_send.
 257  * The caller takes responsibility for any needed locking.
 258  */
 259 static int ath10k_ce_send_nolock(struct ce_state *ce_state,
 260                                  void *per_transfer_context,
 261                                  u32 buffer,
 262                                  unsigned int nbytes,
 263                                  unsigned int transfer_id,
 264                                  unsigned int flags)
 265 {
 266         struct ath10k *ar = ce_state->ar;
 267         struct ce_ring_state *src_ring = ce_state->src_ring;
 268         struct ce_desc *desc, *sdesc;
 269         unsigned int nentries_mask = src_ring->nentries_mask;
 270         unsigned int sw_index = src_ring->sw_index;
 271         unsigned int write_index = src_ring->write_index;
 272         u32 ctrl_addr = ce_state->ctrl_addr;
 273         u32 desc_flags = 0;
 274         int ret = 0;
 275
 276         if (nbytes > ce_state->src_sz_max)
 277                 ath10k_warn("%s: send more we can (nbytes: %d, max: %d)\n",
 278                             __func__, nbytes, ce_state->src_sz_max);
 279
 280         ath10k_pci_wake(ar);
 281
 282         if (unlikely(CE_RING_DELTA(nentries_mask,
 283                                    write_index, sw_index - 1) <= 0)) {
 284                 ret = -EIO;
 285                 goto exit;
 286         }
 287
 288         desc = CE_SRC_RING_TO_DESC(src_ring->base_addr_owner_space,
 289                                    write_index);
 290         sdesc = CE_SRC_RING_TO_DESC(src_ring->shadow_base, write_index);
 291
 292         desc_flags |= SM(transfer_id, CE_DESC_FLAGS_META_DATA);
 293
 294         if (flags & CE_SEND_FLAG_GATHER)
 295                 desc_flags |= CE_DESC_FLAGS_GATHER;
 296         if (flags & CE_SEND_FLAG_BYTE_SWAP)
 297                 desc_flags |= CE_DESC_FLAGS_BYTE_SWAP;
 298
 299         sdesc->addr   = __cpu_to_le32(buffer);
 300         sdesc->nbytes = __cpu_to_le16(nbytes);
 301         sdesc->flags  = __cpu_to_le16(desc_flags);
 302
 303         *desc = *sdesc;
 304
 305         src_ring->per_transfer_context[write_index] = per_transfer_context;
 306
 307         /* Update Source Ring Write Index */
 308         write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
 309
 310         /* WORKAROUND */
 311         if (!(flags & CE_SEND_FLAG_GATHER))
 312                 ath10k_ce_src_ring_write_index_set(ar, ctrl_addr, write_index);
 313
 314         src_ring->write_index = write_index;
 315 exit:
 316         ath10k_pci_sleep(ar);
 317         return ret;
 318 }
 319
 320 int ath10k_ce_send(struct ce_state *ce_state,
 321                    void *per_transfer_context,
 322                    u32 buffer,
 323                    unsigned int nbytes,
 324                    unsigned int transfer_id,
 325                    unsigned int flags)
 326 {
 327         struct ath10k *ar = ce_state->ar;
 328         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 329         int ret;
 330
 331         spin_lock_bh(&ar_pci->ce_lock);
 332         ret = ath10k_ce_send_nolock(ce_state, per_transfer_context,
 333                                     buffer, nbytes, transfer_id, flags);
 334         spin_unlock_bh(&ar_pci->ce_lock);
 335
 336         return ret;
 337 }
 338
 339 void ath10k_ce_sendlist_buf_add(struct ce_sendlist *sendlist, u32 buffer,
 340                                 unsigned int nbytes, u32 flags)
 341 {
 342         unsigned int num_items = sendlist->num_items;
 343         struct ce_sendlist_item *item;
 344
 345         item = &sendlist->item[num_items];
 346         item->data = buffer;
 347         item->u.nbytes = nbytes;
 348         item->flags = flags;
 349         sendlist->num_items++;
 350 }
 351
 352 int ath10k_ce_sendlist_send(struct ce_state *ce_state,
 353                             void *per_transfer_context,
 354                             struct ce_sendlist *sendlist,
 355                             unsigned int transfer_id)
 356 {
 357         struct ce_ring_state *src_ring = ce_state->src_ring;
 358         struct ce_sendlist_item *item;
 359         struct ath10k *ar = ce_state->ar;
 360         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 361         unsigned int nentries_mask = src_ring->nentries_mask;
 362         unsigned int num_items = sendlist->num_items;
 363         unsigned int sw_index;
 364         unsigned int write_index;
 365         int i, delta, ret = -ENOMEM;
 366
 367         spin_lock_bh(&ar_pci->ce_lock);
 368
 369         sw_index = src_ring->sw_index;
 370         write_index = src_ring->write_index;
 371
 372         delta = CE_RING_DELTA(nentries_mask, write_index, sw_index - 1);
 373
 374         if (delta >= num_items) {
 375                 /*
 376                  * Handle all but the last item uniformly.
 377                  */
 378                 for (i = 0; i < num_items - 1; i++) {
 379                         item = &sendlist->item[i];
 380                         ret = ath10k_ce_send_nolock(ce_state,
 381                                                     CE_SENDLIST_ITEM_CTXT,
 382                                                     (u32) item->data,
 383                                                     item->u.nbytes, transfer_id,
 384                                                     item->flags |
 385                                                     CE_SEND_FLAG_GATHER);
 386                         if (ret)
 387                                 ath10k_warn("CE send failed for item: %d\n", i);
 388                 }
 389                 /*
 390                  * Provide valid context pointer for final item.
 391                  */
 392                 item = &sendlist->item[i];
 393                 ret = ath10k_ce_send_nolock(ce_state, per_transfer_context,
 394                                             (u32) item->data, item->u.nbytes,
 395                                             transfer_id, item->flags);
 396                 if (ret)
 397                         ath10k_warn("CE send failed for last item: %d\n", i);
 398         }
 399
 400         spin_unlock_bh(&ar_pci->ce_lock);
 401
 402         return ret;
 403 }
 404
 405 int ath10k_ce_recv_buf_enqueue(struct ce_state *ce_state,
 406                                void *per_recv_context,
 407                                u32 buffer)
 408 {
 409         struct ce_ring_state *dest_ring = ce_state->dest_ring;
 410         u32 ctrl_addr = ce_state->ctrl_addr;
 411         struct ath10k *ar = ce_state->ar;
 412         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 413         unsigned int nentries_mask = dest_ring->nentries_mask;
 414         unsigned int write_index;
 415         unsigned int sw_index;
 416         int ret;
 417
 418         spin_lock_bh(&ar_pci->ce_lock);
 419         write_index = dest_ring->write_index;
 420         sw_index = dest_ring->sw_index;
 421
 422         ath10k_pci_wake(ar);
 423
 424         if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) > 0) {
 425                 struct ce_desc *base = dest_ring->base_addr_owner_space;
 426                 struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, write_index);
 427
 428                 /* Update destination descriptor */
 429                 desc->addr    = __cpu_to_le32(buffer);
 430                 desc->nbytes = 0;
 431
 432                 dest_ring->per_transfer_context[write_index] =
 433                                                         per_recv_context;
 434
 435                 /* Update Destination Ring Write Index */
 436                 write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
 437                 ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
 438                 dest_ring->write_index = write_index;
 439                 ret = 0;
 440         } else {
 441                 ret = -EIO;
 442         }
 443         ath10k_pci_sleep(ar);
 444         spin_unlock_bh(&ar_pci->ce_lock);
 445
 446         return ret;
 447 }
 448
 449 /*
 450  * Guts of ath10k_ce_completed_recv_next.
 451  * The caller takes responsibility for any necessary locking.
 452  */
 453 static int ath10k_ce_completed_recv_next_nolock(struct ce_state *ce_state,
 454                                                 void **per_transfer_contextp,
 455                                                 u32 *bufferp,
 456                                                 unsigned int *nbytesp,
 457                                                 unsigned int *transfer_idp,
 458                                                 unsigned int *flagsp)
 459 {
 460         struct ce_ring_state *dest_ring = ce_state->dest_ring;
 461         unsigned int nentries_mask = dest_ring->nentries_mask;
 462         unsigned int sw_index = dest_ring->sw_index;
 463
 464         struct ce_desc *base = dest_ring->base_addr_owner_space;
 465         struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);
 466         struct ce_desc sdesc;
 467         u16 nbytes;
 468
 469         /* Copy in one go for performance reasons */
 470         sdesc = *desc;
 471
 472         nbytes = __le16_to_cpu(sdesc.nbytes);
 473         if (nbytes == 0) {
 474                 /*
 475                  * This closes a relatively unusual race where the Host
 476                  * sees the updated DRRI before the update to the
 477                  * corresponding descriptor has completed. We treat this
 478                  * as a descriptor that is not yet done.
 479                  */
 480                 return -EIO;
 481         }
 482
 483         desc->nbytes = 0;
 484
 485         /* Return data from completed destination descriptor */
 486         *bufferp = __le32_to_cpu(sdesc.addr);
 487         *nbytesp = nbytes;
 488         *transfer_idp = MS(__le16_to_cpu(sdesc.flags), CE_DESC_FLAGS_META_DATA);
 489
 490         if (__le16_to_cpu(sdesc.flags) & CE_DESC_FLAGS_BYTE_SWAP)
 491                 *flagsp = CE_RECV_FLAG_SWAPPED;
 492         else
 493                 *flagsp = 0;
 494
 495         if (per_transfer_contextp)
 496                 *per_transfer_contextp =
 497                         dest_ring->per_transfer_context[sw_index];
 498
 499         /* sanity */
 500         dest_ring->per_transfer_context[sw_index] = NULL;
 501
 502         /* Update sw_index */
 503         sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 504         dest_ring->sw_index = sw_index;
 505
 506         return 0;
 507 }
 508
 509 int ath10k_ce_completed_recv_next(struct ce_state *ce_state,
 510                                   void **per_transfer_contextp,
 511                                   u32 *bufferp,
 512                                   unsigned int *nbytesp,
 513                                   unsigned int *transfer_idp,
 514                                   unsigned int *flagsp)
 515 {
 516         struct ath10k *ar = ce_state->ar;
 517         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 518         int ret;
 519
 520         spin_lock_bh(&ar_pci->ce_lock);
 521         ret = ath10k_ce_completed_recv_next_nolock(ce_state,
 522                                                    per_transfer_contextp,
 523                                                    bufferp, nbytesp,
 524                                                    transfer_idp, flagsp);
 525         spin_unlock_bh(&ar_pci->ce_lock);
 526
 527         return ret;
 528 }
 529
 530 int ath10k_ce_revoke_recv_next(struct ce_state *ce_state,
 531                                void **per_transfer_contextp,
 532                                u32 *bufferp)
 533 {
 534         struct ce_ring_state *dest_ring;
 535         unsigned int nentries_mask;
 536         unsigned int sw_index;
 537         unsigned int write_index;
 538         int ret;
 539         struct ath10k *ar;
 540         struct ath10k_pci *ar_pci;
 541
 542         dest_ring = ce_state->dest_ring;
 543
 544         if (!dest_ring)
 545                 return -EIO;
 546
 547         ar = ce_state->ar;
 548         ar_pci = ath10k_pci_priv(ar);
 549
 550         spin_lock_bh(&ar_pci->ce_lock);
 551
 552         nentries_mask = dest_ring->nentries_mask;
 553         sw_index = dest_ring->sw_index;
 554         write_index = dest_ring->write_index;
 555         if (write_index != sw_index) {
 556                 struct ce_desc *base = dest_ring->base_addr_owner_space;
 557                 struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);
 558
 559                 /* Return data from completed destination descriptor */
 560                 *bufferp = __le32_to_cpu(desc->addr);
 561
 562                 if (per_transfer_contextp)
 563                         *per_transfer_contextp =
 564                                 dest_ring->per_transfer_context[sw_index];
 565
 566                 /* sanity */
 567                 dest_ring->per_transfer_context[sw_index] = NULL;
 568
 569                 /* Update sw_index */
 570                 sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 571                 dest_ring->sw_index = sw_index;
 572                 ret = 0;
 573         } else {
 574                 ret = -EIO;
 575         }
 576
 577         spin_unlock_bh(&ar_pci->ce_lock);
 578
 579         return ret;
 580 }
 581
 582 /*
 583  * Guts of ath10k_ce_completed_send_next.
 584  * The caller takes responsibility for any necessary locking.
 585  */
 586 static int ath10k_ce_completed_send_next_nolock(struct ce_state *ce_state,
 587                                                 void **per_transfer_contextp,
 588                                                 u32 *bufferp,
 589                                                 unsigned int *nbytesp,
 590                                                 unsigned int *transfer_idp)
 591 {
 592         struct ce_ring_state *src_ring = ce_state->src_ring;
 593         u32 ctrl_addr = ce_state->ctrl_addr;
 594         struct ath10k *ar = ce_state->ar;
 595         unsigned int nentries_mask = src_ring->nentries_mask;
 596         unsigned int sw_index = src_ring->sw_index;
 597         unsigned int read_index;
 598         int ret = -EIO;
 599
 600         if (src_ring->hw_index == sw_index) {
 601                 /*
 602                  * The SW completion index has caught up with the cached
 603                  * version of the HW completion index.
 604                  * Update the cached HW completion index to see whether
 605                  * the SW has really caught up to the HW, or if the cached
 606                  * value of the HW index has become stale.
 607                  */
 608                 ath10k_pci_wake(ar);
 609                 src_ring->hw_index =
 610                         ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
 611                 src_ring->hw_index &= nentries_mask;
 612                 ath10k_pci_sleep(ar);
 613         }
 614         read_index = src_ring->hw_index;
 615
 616         if ((read_index != sw_index) && (read_index != 0xffffffff)) {
 617                 struct ce_desc *sbase = src_ring->shadow_base;
 618                 struct ce_desc *sdesc = CE_SRC_RING_TO_DESC(sbase, sw_index);
 619
 620                 /* Return data from completed source descriptor */
 621                 *bufferp = __le32_to_cpu(sdesc->addr);
 622                 *nbytesp = __le16_to_cpu(sdesc->nbytes);
 623                 *transfer_idp = MS(__le16_to_cpu(sdesc->flags),
 624                                                 CE_DESC_FLAGS_META_DATA);
 625
 626                 if (per_transfer_contextp)
 627                         *per_transfer_contextp =
 628                                 src_ring->per_transfer_context[sw_index];
 629
 630                 /* sanity */
 631                 src_ring->per_transfer_context[sw_index] = NULL;
 632
 633                 /* Update sw_index */
 634                 sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 635                 src_ring->sw_index = sw_index;
 636                 ret = 0;
 637         }
 638
 639         return ret;
 640 }
 641
 642 /* NB: Modeled after ath10k_ce_completed_send_next */
 643 int ath10k_ce_cancel_send_next(struct ce_state *ce_state,
 644                                void **per_transfer_contextp,
 645                                u32 *bufferp,
 646                                unsigned int *nbytesp,
 647                                unsigned int *transfer_idp)
 648 {
 649         struct ce_ring_state *src_ring;
 650         unsigned int nentries_mask;
 651         unsigned int sw_index;
 652         unsigned int write_index;
 653         int ret;
 654         struct ath10k *ar;
 655         struct ath10k_pci *ar_pci;
 656
 657         src_ring = ce_state->src_ring;
 658
 659         if (!src_ring)
 660                 return -EIO;
 661
 662         ar = ce_state->ar;
 663         ar_pci = ath10k_pci_priv(ar);
 664
 665         spin_lock_bh(&ar_pci->ce_lock);
 666
 667         nentries_mask = src_ring->nentries_mask;
 668         sw_index = src_ring->sw_index;
 669         write_index = src_ring->write_index;
 670
 671         if (write_index != sw_index) {
 672                 struct ce_desc *base = src_ring->base_addr_owner_space;
 673                 struct ce_desc *desc = CE_SRC_RING_TO_DESC(base, sw_index);
 674
 675                 /* Return data from completed source descriptor */
 676                 *bufferp = __le32_to_cpu(desc->addr);
 677                 *nbytesp = __le16_to_cpu(desc->nbytes);
 678                 *transfer_idp = MS(__le16_to_cpu(desc->flags),
 679                                                 CE_DESC_FLAGS_META_DATA);
 680
 681                 if (per_transfer_contextp)
 682                         *per_transfer_contextp =
 683                                 src_ring->per_transfer_context[sw_index];
 684
 685                 /* sanity */
 686                 src_ring->per_transfer_context[sw_index] = NULL;
 687
 688                 /* Update sw_index */
 689                 sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 690                 src_ring->sw_index = sw_index;
 691                 ret = 0;
 692         } else {
 693                 ret = -EIO;
 694         }
 695
 696         spin_unlock_bh(&ar_pci->ce_lock);
 697
 698         return ret;
 699 }
 700
 701 int ath10k_ce_completed_send_next(struct ce_state *ce_state,
 702                                   void **per_transfer_contextp,
 703                                   u32 *bufferp,
 704                                   unsigned int *nbytesp,
 705                                   unsigned int *transfer_idp)
 706 {
 707         struct ath10k *ar = ce_state->ar;
 708         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 709         int ret;
 710
 711         spin_lock_bh(&ar_pci->ce_lock);
 712         ret = ath10k_ce_completed_send_next_nolock(ce_state,
 713                                                    per_transfer_contextp,
 714                                                    bufferp, nbytesp,
 715                                                    transfer_idp);
 716         spin_unlock_bh(&ar_pci->ce_lock);
 717
 718         return ret;
 719 }
 720
 721 /*
 722  * Guts of interrupt handler for per-engine interrupts on a particular CE.
 723  *
 724  * Invokes registered callbacks for recv_complete,
 725  * send_complete, and watermarks.
 726  */
 727 void ath10k_ce_per_engine_service(struct ath10k *ar, unsigned int ce_id)
 728 {
 729         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 730         struct ce_state *ce_state = ar_pci->ce_id_to_state[ce_id];
 731         u32 ctrl_addr = ce_state->ctrl_addr;
 732         void *transfer_context;
 733         u32 buf;
 734         unsigned int nbytes;
 735         unsigned int id;
 736         unsigned int flags;
 737
 738         ath10k_pci_wake(ar);
 739         spin_lock_bh(&ar_pci->ce_lock);
 740
 741         /* Clear the copy-complete interrupts that will be handled here. */
 742         ath10k_ce_engine_int_status_clear(ar, ctrl_addr,
 743                                           HOST_IS_COPY_COMPLETE_MASK);
 744
 745         if (ce_state->recv_cb) {
 746                 /*
 747                  * Pop completed recv buffers and call the registered
 748                  * recv callback for each
 749                  */
 750                 while (ath10k_ce_completed_recv_next_nolock(ce_state,
 751                                                             &transfer_context,
 752                                                             &buf, &nbytes,
 753                                                             &id, &flags) == 0) {
 754                         spin_unlock_bh(&ar_pci->ce_lock);
 755                         ce_state->recv_cb(ce_state, transfer_context, buf,
 756                                           nbytes, id, flags);
 757                         spin_lock_bh(&ar_pci->ce_lock);
 758                 }
 759         }
 760
 761         if (ce_state->send_cb) {
 762                 /*
 763                  * Pop completed send buffers and call the registered
 764                  * send callback for each
 765                  */
 766                 while (ath10k_ce_completed_send_next_nolock(ce_state,
 767                                                             &transfer_context,
 768                                                             &buf,
 769                                                             &nbytes,
 770                                                             &id) == 0) {
 771                         spin_unlock_bh(&ar_pci->ce_lock);
 772                         ce_state->send_cb(ce_state, transfer_context,
 773                                           buf, nbytes, id);
 774                         spin_lock_bh(&ar_pci->ce_lock);
 775                 }
 776         }
 777
 778         /*
 779          * Misc CE interrupts are not being handled, but still need
 780          * to be cleared.
 781          */
 782         ath10k_ce_engine_int_status_clear(ar, ctrl_addr, CE_WATERMARK_MASK);
 783
 784         spin_unlock_bh(&ar_pci->ce_lock);
 785         ath10k_pci_sleep(ar);
 786 }
 787
 788 /*
 789  * Handler for per-engine interrupts on ALL active CEs.
 790  * This is used in cases where the system is sharing a
 791  * single interrput for all CEs
 792  */
 793
 794 void ath10k_ce_per_engine_service_any(struct ath10k *ar)
 795 {
 796         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 797         int ce_id;
 798         u32 intr_summary;
 799
 800         ath10k_pci_wake(ar);
 801         intr_summary = CE_INTERRUPT_SUMMARY(ar);
 802
 803         for (ce_id = 0; intr_summary && (ce_id < ar_pci->ce_count); ce_id++) {
 804                 if (intr_summary & (1 << ce_id))
 805                         intr_summary &= ~(1 << ce_id);
 806                 else
 807                         /* no intr pending on this CE */
 808                         continue;
 809
 810                 ath10k_ce_per_engine_service(ar, ce_id);
 811         }
 812
 813         ath10k_pci_sleep(ar);
 814 }
 815
 816 /*
 817  * Adjust interrupts for the copy complete handler.
 818  * If it's needed for either send or recv, then unmask
 819  * this interrupt; otherwise, mask it.
 820  *
 821  * Called with ce_lock held.
 822  */
 823 static void ath10k_ce_per_engine_handler_adjust(struct ce_state *ce_state,
 824                                                 int disable_copy_compl_intr)
 825 {
 826         u32 ctrl_addr = ce_state->ctrl_addr;
 827         struct ath10k *ar = ce_state->ar;
 828
 829         ath10k_pci_wake(ar);
 830
 831         if ((!disable_copy_compl_intr) &&
 832             (ce_state->send_cb || ce_state->recv_cb))
 833                 ath10k_ce_copy_complete_inter_enable(ar, ctrl_addr);
 834         else
 835                 ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);
 836
 837         ath10k_ce_watermark_intr_disable(ar, ctrl_addr);
 838
 839         ath10k_pci_sleep(ar);
 840 }
 841
 842 void ath10k_ce_disable_interrupts(struct ath10k *ar)
 843 {
 844         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 845         int ce_id;
 846
 847         ath10k_pci_wake(ar);
 848         for (ce_id = 0; ce_id < ar_pci->ce_count; ce_id++) {
 849                 struct ce_state *ce_state = ar_pci->ce_id_to_state[ce_id];
 850                 u32 ctrl_addr = ce_state->ctrl_addr;
 851
 852                 ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);
 853         }
 854         ath10k_pci_sleep(ar);
 855 }
 856
 857 void ath10k_ce_send_cb_register(struct ce_state *ce_state,
 858                                 void (*send_cb) (struct ce_state *ce_state,
 859                                                  void *transfer_context,
 860                                                  u32 buffer,
 861                                                  unsigned int nbytes,
 862                                                  unsigned int transfer_id),
 863                                 int disable_interrupts)
 864 {
 865         struct ath10k *ar = ce_state->ar;
 866         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 867
 868         spin_lock_bh(&ar_pci->ce_lock);
 869         ce_state->send_cb = send_cb;
 870         ath10k_ce_per_engine_handler_adjust(ce_state, disable_interrupts);
 871         spin_unlock_bh(&ar_pci->ce_lock);
 872 }
 873
 874 void ath10k_ce_recv_cb_register(struct ce_state *ce_state,
 875                                 void (*recv_cb) (struct ce_state *ce_state,
 876                                                  void *transfer_context,
 877                                                  u32 buffer,
 878                                                  unsigned int nbytes,
 879                                                  unsigned int transfer_id,
 880                                                  unsigned int flags))
 881 {
 882         struct ath10k *ar = ce_state->ar;
 883         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 884
 885         spin_lock_bh(&ar_pci->ce_lock);
 886         ce_state->recv_cb = recv_cb;
 887         ath10k_ce_per_engine_handler_adjust(ce_state, 0);
 888         spin_unlock_bh(&ar_pci->ce_lock);
 889 }
 890
 891 static int ath10k_ce_init_src_ring(struct ath10k *ar,
 892                                    unsigned int ce_id,
 893                                    struct ce_state *ce_state,
 894                                    const struct ce_attr *attr)
 895 {
 896         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 897         struct ce_ring_state *src_ring;
 898         unsigned int nentries = attr->src_nentries;
 899         unsigned int ce_nbytes;
 900         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
 901         dma_addr_t base_addr;
 902         char *ptr;
 903
 904         nentries = roundup_pow_of_two(nentries);
 905
 906         if (ce_state->src_ring) {
 907                 WARN_ON(ce_state->src_ring->nentries != nentries);
 908                 return 0;
 909         }
 910
 911         ce_nbytes = sizeof(struct ce_ring_state) + (nentries * sizeof(void *));
 912         ptr = kzalloc(ce_nbytes, GFP_KERNEL);
 913         if (ptr == NULL)
 914                 return -ENOMEM;
 915
 916         ce_state->src_ring = (struct ce_ring_state *)ptr;
 917         src_ring = ce_state->src_ring;
 918
 919         ptr += sizeof(struct ce_ring_state);
 920         src_ring->nentries = nentries;
 921         src_ring->nentries_mask = nentries - 1;
 922
 923         ath10k_pci_wake(ar);
 924         src_ring->sw_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
 925         src_ring->sw_index &= src_ring->nentries_mask;
 926         src_ring->hw_index = src_ring->sw_index;
 927
 928         src_ring->write_index =
 929                 ath10k_ce_src_ring_write_index_get(ar, ctrl_addr);
 930         src_ring->write_index &= src_ring->nentries_mask;
 931         ath10k_pci_sleep(ar);
 932
 933         src_ring->per_transfer_context = (void **)ptr;
 934
 935         /*
 936          * Legacy platforms that do not support cache
 937          * coherent DMA are unsupported
 938          */
 939         src_ring->base_addr_owner_space_unaligned =
 940                 pci_alloc_consistent(ar_pci->pdev,
 941                                      (nentries * sizeof(struct ce_desc) +
 942                                       CE_DESC_RING_ALIGN),
 943                                      &base_addr);
 944         src_ring->base_addr_ce_space_unaligned = base_addr;
 945
 946         src_ring->base_addr_owner_space = PTR_ALIGN(
 947                         src_ring->base_addr_owner_space_unaligned,
 948                         CE_DESC_RING_ALIGN);
 949         src_ring->base_addr_ce_space = ALIGN(
 950                         src_ring->base_addr_ce_space_unaligned,
 951                         CE_DESC_RING_ALIGN);
 952
 953         /*
 954          * Also allocate a shadow src ring in regular
 955          * mem to use for faster access.
 956          */
 957         src_ring->shadow_base_unaligned =
 958                 kmalloc((nentries * sizeof(struct ce_desc) +
 959                          CE_DESC_RING_ALIGN), GFP_KERNEL);
 960
 961         src_ring->shadow_base = PTR_ALIGN(
 962                         src_ring->shadow_base_unaligned,
 963                         CE_DESC_RING_ALIGN);
 964
 965         ath10k_pci_wake(ar);
 966         ath10k_ce_src_ring_base_addr_set(ar, ctrl_addr,
 967                                          src_ring->base_addr_ce_space);
 968         ath10k_ce_src_ring_size_set(ar, ctrl_addr, nentries);
 969         ath10k_ce_src_ring_dmax_set(ar, ctrl_addr, attr->src_sz_max);
 970         ath10k_ce_src_ring_byte_swap_set(ar, ctrl_addr, 0);
 971         ath10k_ce_src_ring_lowmark_set(ar, ctrl_addr, 0);
 972         ath10k_ce_src_ring_highmark_set(ar, ctrl_addr, nentries);
 973         ath10k_pci_sleep(ar);
 974
 975         return 0;
 976 }
 977
 978 static int ath10k_ce_init_dest_ring(struct ath10k *ar,
 979                                     unsigned int ce_id,
 980                                     struct ce_state *ce_state,
 981                                     const struct ce_attr *attr)
 982 {
 983         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 984         struct ce_ring_state *dest_ring;
 985         unsigned int nentries = attr->dest_nentries;
 986         unsigned int ce_nbytes;
 987         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
 988         dma_addr_t base_addr;
 989         char *ptr;
 990
 991         nentries = roundup_pow_of_two(nentries);
 992
 993         if (ce_state->dest_ring) {
 994                 WARN_ON(ce_state->dest_ring->nentries != nentries);
 995                 return 0;
 996         }
 997
 998         ce_nbytes = sizeof(struct ce_ring_state) + (nentries * sizeof(void *));
 999         ptr = kzalloc(ce_nbytes, GFP_KERNEL);
1000         if (ptr == NULL)
1001                 return -ENOMEM;
1002
1003         ce_state->dest_ring = (struct ce_ring_state *)ptr;
1004         dest_ring = ce_state->dest_ring;
1005
1006         ptr += sizeof(struct ce_ring_state);
1007         dest_ring->nentries = nentries;
1008         dest_ring->nentries_mask = nentries - 1;
1009
1010         ath10k_pci_wake(ar);
1011         dest_ring->sw_index = ath10k_ce_dest_ring_read_index_get(ar, ctrl_addr);
1012         dest_ring->sw_index &= dest_ring->nentries_mask;
1013         dest_ring->write_index =
1014                 ath10k_ce_dest_ring_write_index_get(ar, ctrl_addr);
1015         dest_ring->write_index &= dest_ring->nentries_mask;
1016         ath10k_pci_sleep(ar);
1017
1018         dest_ring->per_transfer_context = (void **)ptr;
1019
1020         /*
1021          * Legacy platforms that do not support cache
1022          * coherent DMA are unsupported
1023          */
1024         dest_ring->base_addr_owner_space_unaligned =
1025                 pci_alloc_consistent(ar_pci->pdev,
1026                                      (nentries * sizeof(struct ce_desc) +
1027                                       CE_DESC_RING_ALIGN),
1028                                      &base_addr);
1029         dest_ring->base_addr_ce_space_unaligned = base_addr;
1030
1031         /*
1032          * Correctly initialize memory to 0 to prevent garbage
1033          * data crashing system when download firmware
1034          */
1035         memset(dest_ring->base_addr_owner_space_unaligned, 0,
1036                nentries * sizeof(struct ce_desc) + CE_DESC_RING_ALIGN);
1037
1038         dest_ring->base_addr_owner_space = PTR_ALIGN(
1039                         dest_ring->base_addr_owner_space_unaligned,
1040                         CE_DESC_RING_ALIGN);
1041         dest_ring->base_addr_ce_space = ALIGN(
1042                         dest_ring->base_addr_ce_space_unaligned,
1043                         CE_DESC_RING_ALIGN);
1044
1045         ath10k_pci_wake(ar);
1046         ath10k_ce_dest_ring_base_addr_set(ar, ctrl_addr,
1047                                           dest_ring->base_addr_ce_space);
1048         ath10k_ce_dest_ring_size_set(ar, ctrl_addr, nentries);
1049         ath10k_ce_dest_ring_byte_swap_set(ar, ctrl_addr, 0);
1050         ath10k_ce_dest_ring_lowmark_set(ar, ctrl_addr, 0);
1051         ath10k_ce_dest_ring_highmark_set(ar, ctrl_addr, nentries);
1052         ath10k_pci_sleep(ar);
1053
1054         return 0;
1055 }
1056
1057 static struct ce_state *ath10k_ce_init_state(struct ath10k *ar,
1058                                              unsigned int ce_id,
1059                                              const struct ce_attr *attr)
1060 {
1061         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
1062         struct ce_state *ce_state = NULL;
1063         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
1064
1065         spin_lock_bh(&ar_pci->ce_lock);
1066
1067         if (!ar_pci->ce_id_to_state[ce_id]) {
1068                 ce_state = kzalloc(sizeof(*ce_state), GFP_ATOMIC);
1069                 if (ce_state == NULL) {
1070                         spin_unlock_bh(&ar_pci->ce_lock);
1071                         return NULL;
1072                 }
1073
1074                 ar_pci->ce_id_to_state[ce_id] = ce_state;
1075                 ce_state->ar = ar;
1076                 ce_state->id = ce_id;
1077                 ce_state->ctrl_addr = ctrl_addr;
1078                 ce_state->state = CE_RUNNING;
1079                 /* Save attribute flags */
1080                 ce_state->attr_flags = attr->flags;
1081                 ce_state->src_sz_max = attr->src_sz_max;
1082         }
1083
1084         spin_unlock_bh(&ar_pci->ce_lock);
1085
1086         return ce_state;
1087 }
1088
1089 /*
1090  * Initialize a Copy Engine based on caller-supplied attributes.
1091  * This may be called once to initialize both source and destination
1092  * rings or it may be called twice for separate source and destination
1093  * initialization. It may be that only one side or the other is
1094  * initialized by software/firmware.
1095  */
1096 struct ce_state *ath10k_ce_init(struct ath10k *ar,
1097                                 unsigned int ce_id,
1098                                 const struct ce_attr *attr)
1099 {
1100         struct ce_state *ce_state;
1101         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
1102
1103         ce_state = ath10k_ce_init_state(ar, ce_id, attr);
1104         if (!ce_state) {
1105                 ath10k_err("Failed to initialize CE state for ID: %d\n", ce_id);
1106                 return NULL;
1107         }
1108
1109         if (attr->src_nentries) {
1110                 if (ath10k_ce_init_src_ring(ar, ce_id, ce_state, attr)) {
1111                         ath10k_err("Failed to initialize CE src ring for ID: %d\n",
1112                                    ce_id);
1113                         ath10k_ce_deinit(ce_state);
1114                         return NULL;
1115                 }
1116         }
1117
1118         if (attr->dest_nentries) {
1119                 if (ath10k_ce_init_dest_ring(ar, ce_id, ce_state, attr)) {
1120                         ath10k_err("Failed to initialize CE dest ring for ID: %d\n",
1121                                    ce_id);
1122                         ath10k_ce_deinit(ce_state);
1123                         return NULL;
1124                 }
1125         }
1126
1127         /* Enable CE error interrupts */
1128         ath10k_pci_wake(ar);
1129         ath10k_ce_error_intr_enable(ar, ctrl_addr);
1130         ath10k_pci_sleep(ar);
1131
1132         return ce_state;
1133 }
1134
1135 void ath10k_ce_deinit(struct ce_state *ce_state)
1136 {
1137         unsigned int ce_id = ce_state->id;
1138         struct ath10k *ar = ce_state->ar;
1139         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
1140
1141         ce_state->state = CE_UNUSED;
1142         ar_pci->ce_id_to_state[ce_id] = NULL;
1143
1144         if (ce_state->src_ring) {
1145                 kfree(ce_state->src_ring->shadow_base_unaligned);
1146                 pci_free_consistent(ar_pci->pdev,
1147                                     (ce_state->src_ring->nentries *
1148                                      sizeof(struct ce_desc) +
1149                                      CE_DESC_RING_ALIGN),
1150                                     ce_state->src_ring->base_addr_owner_space,
1151                                     ce_state->src_ring->base_addr_ce_space);
1152                 kfree(ce_state->src_ring);
1153         }
1154
1155         if (ce_state->dest_ring) {
1156                 pci_free_consistent(ar_pci->pdev,
1157                                     (ce_state->dest_ring->nentries *
1158                                      sizeof(struct ce_desc) +
1159                                      CE_DESC_RING_ALIGN),
1160                                     ce_state->dest_ring->base_addr_owner_space,
1161                                     ce_state->dest_ring->base_addr_ce_space);
1162                 kfree(ce_state->dest_ring);
1163         }
1164         kfree(ce_state);
1165 }