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_error_intr_disable(struct ath10k *ar,
 247                                                 u32 ce_ctrl_addr)
 248 {
 249         u32 misc_ie_addr = ath10k_pci_read32(ar,
 250                                              ce_ctrl_addr + MISC_IE_ADDRESS);
 251
 252         ath10k_pci_write32(ar, ce_ctrl_addr + MISC_IE_ADDRESS,
 253                            misc_ie_addr & ~CE_ERROR_MASK);
 254 }
 255
 256 static inline void ath10k_ce_engine_int_status_clear(struct ath10k *ar,
 257                                                      u32 ce_ctrl_addr,
 258                                                      unsigned int mask)
 259 {
 260         ath10k_pci_write32(ar, ce_ctrl_addr + HOST_IS_ADDRESS, mask);
 261 }
 262
 263
 264 /*
 265  * Guts of ath10k_ce_send, used by both ath10k_ce_send and
 266  * ath10k_ce_sendlist_send.
 267  * The caller takes responsibility for any needed locking.
 268  */
 269 int ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
 270                           void *per_transfer_context,
 271                           u32 buffer,
 272                           unsigned int nbytes,
 273                           unsigned int transfer_id,
 274                           unsigned int flags)
 275 {
 276         struct ath10k *ar = ce_state->ar;
 277         struct ath10k_ce_ring *src_ring = ce_state->src_ring;
 278         struct ce_desc *desc, *sdesc;
 279         unsigned int nentries_mask = src_ring->nentries_mask;
 280         unsigned int sw_index = src_ring->sw_index;
 281         unsigned int write_index = src_ring->write_index;
 282         u32 ctrl_addr = ce_state->ctrl_addr;
 283         u32 desc_flags = 0;
 284         int ret = 0;
 285
 286         if (nbytes > ce_state->src_sz_max)
 287                 ath10k_warn("%s: send more we can (nbytes: %d, max: %d)\n",
 288                             __func__, nbytes, ce_state->src_sz_max);
 289
 290         if (unlikely(CE_RING_DELTA(nentries_mask,
 291                                    write_index, sw_index - 1) <= 0)) {
 292                 ret = -ENOSR;
 293                 goto exit;
 294         }
 295
 296         desc = CE_SRC_RING_TO_DESC(src_ring->base_addr_owner_space,
 297                                    write_index);
 298         sdesc = CE_SRC_RING_TO_DESC(src_ring->shadow_base, write_index);
 299
 300         desc_flags |= SM(transfer_id, CE_DESC_FLAGS_META_DATA);
 301
 302         if (flags & CE_SEND_FLAG_GATHER)
 303                 desc_flags |= CE_DESC_FLAGS_GATHER;
 304         if (flags & CE_SEND_FLAG_BYTE_SWAP)
 305                 desc_flags |= CE_DESC_FLAGS_BYTE_SWAP;
 306
 307         sdesc->addr   = __cpu_to_le32(buffer);
 308         sdesc->nbytes = __cpu_to_le16(nbytes);
 309         sdesc->flags  = __cpu_to_le16(desc_flags);
 310
 311         *desc = *sdesc;
 312
 313         src_ring->per_transfer_context[write_index] = per_transfer_context;
 314
 315         /* Update Source Ring Write Index */
 316         write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
 317
 318         /* WORKAROUND */
 319         if (!(flags & CE_SEND_FLAG_GATHER))
 320                 ath10k_ce_src_ring_write_index_set(ar, ctrl_addr, write_index);
 321
 322         src_ring->write_index = write_index;
 323 exit:
 324         return ret;
 325 }
 326
 327 void __ath10k_ce_send_revert(struct ath10k_ce_pipe *pipe)
 328 {
 329         struct ath10k *ar = pipe->ar;
 330         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 331         struct ath10k_ce_ring *src_ring = pipe->src_ring;
 332         u32 ctrl_addr = pipe->ctrl_addr;
 333
 334         lockdep_assert_held(&ar_pci->ce_lock);
 335
 336         /*
 337          * This function must be called only if there is an incomplete
 338          * scatter-gather transfer (before index register is updated)
 339          * that needs to be cleaned up.
 340          */
 341         if (WARN_ON_ONCE(src_ring->write_index == src_ring->sw_index))
 342                 return;
 343
 344         if (WARN_ON_ONCE(src_ring->write_index ==
 345                          ath10k_ce_src_ring_write_index_get(ar, ctrl_addr)))
 346                 return;
 347
 348         src_ring->write_index--;
 349         src_ring->write_index &= src_ring->nentries_mask;
 350
 351         src_ring->per_transfer_context[src_ring->write_index] = NULL;
 352 }
 353
 354 int ath10k_ce_send(struct ath10k_ce_pipe *ce_state,
 355                    void *per_transfer_context,
 356                    u32 buffer,
 357                    unsigned int nbytes,
 358                    unsigned int transfer_id,
 359                    unsigned int flags)
 360 {
 361         struct ath10k *ar = ce_state->ar;
 362         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 363         int ret;
 364
 365         spin_lock_bh(&ar_pci->ce_lock);
 366         ret = ath10k_ce_send_nolock(ce_state, per_transfer_context,
 367                                     buffer, nbytes, transfer_id, flags);
 368         spin_unlock_bh(&ar_pci->ce_lock);
 369
 370         return ret;
 371 }
 372
 373 int ath10k_ce_num_free_src_entries(struct ath10k_ce_pipe *pipe)
 374 {
 375         struct ath10k *ar = pipe->ar;
 376         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 377         int delta;
 378
 379         spin_lock_bh(&ar_pci->ce_lock);
 380         delta = CE_RING_DELTA(pipe->src_ring->nentries_mask,
 381                               pipe->src_ring->write_index,
 382                               pipe->src_ring->sw_index - 1);
 383         spin_unlock_bh(&ar_pci->ce_lock);
 384
 385         return delta;
 386 }
 387
 388 int ath10k_ce_recv_buf_enqueue(struct ath10k_ce_pipe *ce_state,
 389                                void *per_recv_context,
 390                                u32 buffer)
 391 {
 392         struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
 393         u32 ctrl_addr = ce_state->ctrl_addr;
 394         struct ath10k *ar = ce_state->ar;
 395         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 396         unsigned int nentries_mask = dest_ring->nentries_mask;
 397         unsigned int write_index;
 398         unsigned int sw_index;
 399         int ret;
 400
 401         spin_lock_bh(&ar_pci->ce_lock);
 402         write_index = dest_ring->write_index;
 403         sw_index = dest_ring->sw_index;
 404
 405         if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) > 0) {
 406                 struct ce_desc *base = dest_ring->base_addr_owner_space;
 407                 struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, write_index);
 408
 409                 /* Update destination descriptor */
 410                 desc->addr    = __cpu_to_le32(buffer);
 411                 desc->nbytes = 0;
 412
 413                 dest_ring->per_transfer_context[write_index] =
 414                                                         per_recv_context;
 415
 416                 /* Update Destination Ring Write Index */
 417                 write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
 418                 ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
 419                 dest_ring->write_index = write_index;
 420                 ret = 0;
 421         } else {
 422                 ret = -EIO;
 423         }
 424
 425         spin_unlock_bh(&ar_pci->ce_lock);
 426         return ret;
 427 }
 428
 429 /*
 430  * Guts of ath10k_ce_completed_recv_next.
 431  * The caller takes responsibility for any necessary locking.
 432  */
 433 static int ath10k_ce_completed_recv_next_nolock(struct ath10k_ce_pipe *ce_state,
 434                                                 void **per_transfer_contextp,
 435                                                 u32 *bufferp,
 436                                                 unsigned int *nbytesp,
 437                                                 unsigned int *transfer_idp,
 438                                                 unsigned int *flagsp)
 439 {
 440         struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
 441         unsigned int nentries_mask = dest_ring->nentries_mask;
 442         unsigned int sw_index = dest_ring->sw_index;
 443
 444         struct ce_desc *base = dest_ring->base_addr_owner_space;
 445         struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);
 446         struct ce_desc sdesc;
 447         u16 nbytes;
 448
 449         /* Copy in one go for performance reasons */
 450         sdesc = *desc;
 451
 452         nbytes = __le16_to_cpu(sdesc.nbytes);
 453         if (nbytes == 0) {
 454                 /*
 455                  * This closes a relatively unusual race where the Host
 456                  * sees the updated DRRI before the update to the
 457                  * corresponding descriptor has completed. We treat this
 458                  * as a descriptor that is not yet done.
 459                  */
 460                 return -EIO;
 461         }
 462
 463         desc->nbytes = 0;
 464
 465         /* Return data from completed destination descriptor */
 466         *bufferp = __le32_to_cpu(sdesc.addr);
 467         *nbytesp = nbytes;
 468         *transfer_idp = MS(__le16_to_cpu(sdesc.flags), CE_DESC_FLAGS_META_DATA);
 469
 470         if (__le16_to_cpu(sdesc.flags) & CE_DESC_FLAGS_BYTE_SWAP)
 471                 *flagsp = CE_RECV_FLAG_SWAPPED;
 472         else
 473                 *flagsp = 0;
 474
 475         if (per_transfer_contextp)
 476                 *per_transfer_contextp =
 477                         dest_ring->per_transfer_context[sw_index];
 478
 479         /* sanity */
 480         dest_ring->per_transfer_context[sw_index] = NULL;
 481
 482         /* Update sw_index */
 483         sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 484         dest_ring->sw_index = sw_index;
 485
 486         return 0;
 487 }
 488
 489 int ath10k_ce_completed_recv_next(struct ath10k_ce_pipe *ce_state,
 490                                   void **per_transfer_contextp,
 491                                   u32 *bufferp,
 492                                   unsigned int *nbytesp,
 493                                   unsigned int *transfer_idp,
 494                                   unsigned int *flagsp)
 495 {
 496         struct ath10k *ar = ce_state->ar;
 497         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 498         int ret;
 499
 500         spin_lock_bh(&ar_pci->ce_lock);
 501         ret = ath10k_ce_completed_recv_next_nolock(ce_state,
 502                                                    per_transfer_contextp,
 503                                                    bufferp, nbytesp,
 504                                                    transfer_idp, flagsp);
 505         spin_unlock_bh(&ar_pci->ce_lock);
 506
 507         return ret;
 508 }
 509
 510 int ath10k_ce_revoke_recv_next(struct ath10k_ce_pipe *ce_state,
 511                                void **per_transfer_contextp,
 512                                u32 *bufferp)
 513 {
 514         struct ath10k_ce_ring *dest_ring;
 515         unsigned int nentries_mask;
 516         unsigned int sw_index;
 517         unsigned int write_index;
 518         int ret;
 519         struct ath10k *ar;
 520         struct ath10k_pci *ar_pci;
 521
 522         dest_ring = ce_state->dest_ring;
 523
 524         if (!dest_ring)
 525                 return -EIO;
 526
 527         ar = ce_state->ar;
 528         ar_pci = ath10k_pci_priv(ar);
 529
 530         spin_lock_bh(&ar_pci->ce_lock);
 531
 532         nentries_mask = dest_ring->nentries_mask;
 533         sw_index = dest_ring->sw_index;
 534         write_index = dest_ring->write_index;
 535         if (write_index != sw_index) {
 536                 struct ce_desc *base = dest_ring->base_addr_owner_space;
 537                 struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);
 538
 539                 /* Return data from completed destination descriptor */
 540                 *bufferp = __le32_to_cpu(desc->addr);
 541
 542                 if (per_transfer_contextp)
 543                         *per_transfer_contextp =
 544                                 dest_ring->per_transfer_context[sw_index];
 545
 546                 /* sanity */
 547                 dest_ring->per_transfer_context[sw_index] = NULL;
 548
 549                 /* Update sw_index */
 550                 sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 551                 dest_ring->sw_index = sw_index;
 552                 ret = 0;
 553         } else {
 554                 ret = -EIO;
 555         }
 556
 557         spin_unlock_bh(&ar_pci->ce_lock);
 558
 559         return ret;
 560 }
 561
 562 /*
 563  * Guts of ath10k_ce_completed_send_next.
 564  * The caller takes responsibility for any necessary locking.
 565  */
 566 static int ath10k_ce_completed_send_next_nolock(struct ath10k_ce_pipe *ce_state,
 567                                                 void **per_transfer_contextp,
 568                                                 u32 *bufferp,
 569                                                 unsigned int *nbytesp,
 570                                                 unsigned int *transfer_idp)
 571 {
 572         struct ath10k_ce_ring *src_ring = ce_state->src_ring;
 573         u32 ctrl_addr = ce_state->ctrl_addr;
 574         struct ath10k *ar = ce_state->ar;
 575         unsigned int nentries_mask = src_ring->nentries_mask;
 576         unsigned int sw_index = src_ring->sw_index;
 577         struct ce_desc *sdesc, *sbase;
 578         unsigned int read_index;
 579
 580         if (src_ring->hw_index == sw_index) {
 581                 /*
 582                  * The SW completion index has caught up with the cached
 583                  * version of the HW completion index.
 584                  * Update the cached HW completion index to see whether
 585                  * the SW has really caught up to the HW, or if the cached
 586                  * value of the HW index has become stale.
 587                  */
 588
 589                 read_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
 590                 if (read_index == 0xffffffff)
 591                         return -ENODEV;
 592
 593                 read_index &= nentries_mask;
 594                 src_ring->hw_index = read_index;
 595         }
 596
 597         read_index = src_ring->hw_index;
 598
 599         if (read_index == sw_index)
 600                 return -EIO;
 601
 602         sbase = src_ring->shadow_base;
 603         sdesc = CE_SRC_RING_TO_DESC(sbase, sw_index);
 604
 605         /* Return data from completed source descriptor */
 606         *bufferp = __le32_to_cpu(sdesc->addr);
 607         *nbytesp = __le16_to_cpu(sdesc->nbytes);
 608         *transfer_idp = MS(__le16_to_cpu(sdesc->flags),
 609                            CE_DESC_FLAGS_META_DATA);
 610
 611         if (per_transfer_contextp)
 612                 *per_transfer_contextp =
 613                         src_ring->per_transfer_context[sw_index];
 614
 615         /* sanity */
 616         src_ring->per_transfer_context[sw_index] = NULL;
 617
 618         /* Update sw_index */
 619         sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 620         src_ring->sw_index = sw_index;
 621
 622         return 0;
 623 }
 624
 625 /* NB: Modeled after ath10k_ce_completed_send_next */
 626 int ath10k_ce_cancel_send_next(struct ath10k_ce_pipe *ce_state,
 627                                void **per_transfer_contextp,
 628                                u32 *bufferp,
 629                                unsigned int *nbytesp,
 630                                unsigned int *transfer_idp)
 631 {
 632         struct ath10k_ce_ring *src_ring;
 633         unsigned int nentries_mask;
 634         unsigned int sw_index;
 635         unsigned int write_index;
 636         int ret;
 637         struct ath10k *ar;
 638         struct ath10k_pci *ar_pci;
 639
 640         src_ring = ce_state->src_ring;
 641
 642         if (!src_ring)
 643                 return -EIO;
 644
 645         ar = ce_state->ar;
 646         ar_pci = ath10k_pci_priv(ar);
 647
 648         spin_lock_bh(&ar_pci->ce_lock);
 649
 650         nentries_mask = src_ring->nentries_mask;
 651         sw_index = src_ring->sw_index;
 652         write_index = src_ring->write_index;
 653
 654         if (write_index != sw_index) {
 655                 struct ce_desc *base = src_ring->base_addr_owner_space;
 656                 struct ce_desc *desc = CE_SRC_RING_TO_DESC(base, sw_index);
 657
 658                 /* Return data from completed source descriptor */
 659                 *bufferp = __le32_to_cpu(desc->addr);
 660                 *nbytesp = __le16_to_cpu(desc->nbytes);
 661                 *transfer_idp = MS(__le16_to_cpu(desc->flags),
 662                                                 CE_DESC_FLAGS_META_DATA);
 663
 664                 if (per_transfer_contextp)
 665                         *per_transfer_contextp =
 666                                 src_ring->per_transfer_context[sw_index];
 667
 668                 /* sanity */
 669                 src_ring->per_transfer_context[sw_index] = NULL;
 670
 671                 /* Update sw_index */
 672                 sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
 673                 src_ring->sw_index = sw_index;
 674                 ret = 0;
 675         } else {
 676                 ret = -EIO;
 677         }
 678
 679         spin_unlock_bh(&ar_pci->ce_lock);
 680
 681         return ret;
 682 }
 683
 684 int ath10k_ce_completed_send_next(struct ath10k_ce_pipe *ce_state,
 685                                   void **per_transfer_contextp,
 686                                   u32 *bufferp,
 687                                   unsigned int *nbytesp,
 688                                   unsigned int *transfer_idp)
 689 {
 690         struct ath10k *ar = ce_state->ar;
 691         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 692         int ret;
 693
 694         spin_lock_bh(&ar_pci->ce_lock);
 695         ret = ath10k_ce_completed_send_next_nolock(ce_state,
 696                                                    per_transfer_contextp,
 697                                                    bufferp, nbytesp,
 698                                                    transfer_idp);
 699         spin_unlock_bh(&ar_pci->ce_lock);
 700
 701         return ret;
 702 }
 703
 704 /*
 705  * Guts of interrupt handler for per-engine interrupts on a particular CE.
 706  *
 707  * Invokes registered callbacks for recv_complete,
 708  * send_complete, and watermarks.
 709  */
 710 void ath10k_ce_per_engine_service(struct ath10k *ar, unsigned int ce_id)
 711 {
 712         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 713         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
 714         u32 ctrl_addr = ce_state->ctrl_addr;
 715
 716         spin_lock_bh(&ar_pci->ce_lock);
 717
 718         /* Clear the copy-complete interrupts that will be handled here. */
 719         ath10k_ce_engine_int_status_clear(ar, ctrl_addr,
 720                                           HOST_IS_COPY_COMPLETE_MASK);
 721
 722         spin_unlock_bh(&ar_pci->ce_lock);
 723
 724         if (ce_state->recv_cb)
 725                 ce_state->recv_cb(ce_state);
 726
 727         if (ce_state->send_cb)
 728                 ce_state->send_cb(ce_state);
 729
 730         spin_lock_bh(&ar_pci->ce_lock);
 731
 732         /*
 733          * Misc CE interrupts are not being handled, but still need
 734          * to be cleared.
 735          */
 736         ath10k_ce_engine_int_status_clear(ar, ctrl_addr, CE_WATERMARK_MASK);
 737
 738         spin_unlock_bh(&ar_pci->ce_lock);
 739 }
 740
 741 /*
 742  * Handler for per-engine interrupts on ALL active CEs.
 743  * This is used in cases where the system is sharing a
 744  * single interrput for all CEs
 745  */
 746
 747 void ath10k_ce_per_engine_service_any(struct ath10k *ar)
 748 {
 749         int ce_id;
 750         u32 intr_summary;
 751
 752         intr_summary = CE_INTERRUPT_SUMMARY(ar);
 753
 754         for (ce_id = 0; intr_summary && (ce_id < CE_COUNT); ce_id++) {
 755                 if (intr_summary & (1 << ce_id))
 756                         intr_summary &= ~(1 << ce_id);
 757                 else
 758                         /* no intr pending on this CE */
 759                         continue;
 760
 761                 ath10k_ce_per_engine_service(ar, ce_id);
 762         }
 763 }
 764
 765 /*
 766  * Adjust interrupts for the copy complete handler.
 767  * If it's needed for either send or recv, then unmask
 768  * this interrupt; otherwise, mask it.
 769  *
 770  * Called with ce_lock held.
 771  */
 772 static void ath10k_ce_per_engine_handler_adjust(struct ath10k_ce_pipe *ce_state,
 773                                                 int disable_copy_compl_intr)
 774 {
 775         u32 ctrl_addr = ce_state->ctrl_addr;
 776         struct ath10k *ar = ce_state->ar;
 777
 778         if ((!disable_copy_compl_intr) &&
 779             (ce_state->send_cb || ce_state->recv_cb))
 780                 ath10k_ce_copy_complete_inter_enable(ar, ctrl_addr);
 781         else
 782                 ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);
 783
 784         ath10k_ce_watermark_intr_disable(ar, ctrl_addr);
 785 }
 786
 787 int ath10k_ce_disable_interrupts(struct ath10k *ar)
 788 {
 789         int ce_id;
 790
 791         for (ce_id = 0; ce_id < CE_COUNT; ce_id++) {
 792                 u32 ctrl_addr = ath10k_ce_base_address(ce_id);
 793
 794                 ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);
 795                 ath10k_ce_error_intr_disable(ar, ctrl_addr);
 796                 ath10k_ce_watermark_intr_disable(ar, ctrl_addr);
 797         }
 798
 799         return 0;
 800 }
 801
 802 void ath10k_ce_send_cb_register(struct ath10k_ce_pipe *ce_state,
 803                                 void (*send_cb)(struct ath10k_ce_pipe *),
 804                                 int disable_interrupts)
 805 {
 806         struct ath10k *ar = ce_state->ar;
 807         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 808
 809         spin_lock_bh(&ar_pci->ce_lock);
 810         ce_state->send_cb = send_cb;
 811         ath10k_ce_per_engine_handler_adjust(ce_state, disable_interrupts);
 812         spin_unlock_bh(&ar_pci->ce_lock);
 813 }
 814
 815 void ath10k_ce_recv_cb_register(struct ath10k_ce_pipe *ce_state,
 816                                 void (*recv_cb)(struct ath10k_ce_pipe *))
 817 {
 818         struct ath10k *ar = ce_state->ar;
 819         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 820
 821         spin_lock_bh(&ar_pci->ce_lock);
 822         ce_state->recv_cb = recv_cb;
 823         ath10k_ce_per_engine_handler_adjust(ce_state, 0);
 824         spin_unlock_bh(&ar_pci->ce_lock);
 825 }
 826
 827 static int ath10k_ce_init_src_ring(struct ath10k *ar,
 828                                    unsigned int ce_id,
 829                                    const struct ce_attr *attr)
 830 {
 831         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 832         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
 833         struct ath10k_ce_ring *src_ring = ce_state->src_ring;
 834         u32 nentries, ctrl_addr = ath10k_ce_base_address(ce_id);
 835
 836         nentries = roundup_pow_of_two(attr->src_nentries);
 837
 838         memset(src_ring->per_transfer_context, 0,
 839                nentries * sizeof(*src_ring->per_transfer_context));
 840
 841         src_ring->sw_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
 842         src_ring->sw_index &= src_ring->nentries_mask;
 843         src_ring->hw_index = src_ring->sw_index;
 844
 845         src_ring->write_index =
 846                 ath10k_ce_src_ring_write_index_get(ar, ctrl_addr);
 847         src_ring->write_index &= src_ring->nentries_mask;
 848
 849         ath10k_ce_src_ring_base_addr_set(ar, ctrl_addr,
 850                                          src_ring->base_addr_ce_space);
 851         ath10k_ce_src_ring_size_set(ar, ctrl_addr, nentries);
 852         ath10k_ce_src_ring_dmax_set(ar, ctrl_addr, attr->src_sz_max);
 853         ath10k_ce_src_ring_byte_swap_set(ar, ctrl_addr, 0);
 854         ath10k_ce_src_ring_lowmark_set(ar, ctrl_addr, 0);
 855         ath10k_ce_src_ring_highmark_set(ar, ctrl_addr, nentries);
 856
 857         ath10k_dbg(ATH10K_DBG_BOOT,
 858                    "boot init ce src ring id %d entries %d base_addr %p\n",
 859                    ce_id, nentries, src_ring->base_addr_owner_space);
 860
 861         return 0;
 862 }
 863
 864 static int ath10k_ce_init_dest_ring(struct ath10k *ar,
 865                                     unsigned int ce_id,
 866                                     const struct ce_attr *attr)
 867 {
 868         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 869         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
 870         struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
 871         u32 nentries, ctrl_addr = ath10k_ce_base_address(ce_id);
 872
 873         nentries = roundup_pow_of_two(attr->dest_nentries);
 874
 875         memset(dest_ring->per_transfer_context, 0,
 876                nentries * sizeof(*dest_ring->per_transfer_context));
 877
 878         dest_ring->sw_index = ath10k_ce_dest_ring_read_index_get(ar, ctrl_addr);
 879         dest_ring->sw_index &= dest_ring->nentries_mask;
 880         dest_ring->write_index =
 881                 ath10k_ce_dest_ring_write_index_get(ar, ctrl_addr);
 882         dest_ring->write_index &= dest_ring->nentries_mask;
 883
 884         ath10k_ce_dest_ring_base_addr_set(ar, ctrl_addr,
 885                                           dest_ring->base_addr_ce_space);
 886         ath10k_ce_dest_ring_size_set(ar, ctrl_addr, nentries);
 887         ath10k_ce_dest_ring_byte_swap_set(ar, ctrl_addr, 0);
 888         ath10k_ce_dest_ring_lowmark_set(ar, ctrl_addr, 0);
 889         ath10k_ce_dest_ring_highmark_set(ar, ctrl_addr, nentries);
 890
 891         ath10k_dbg(ATH10K_DBG_BOOT,
 892                    "boot ce dest ring id %d entries %d base_addr %p\n",
 893                    ce_id, nentries, dest_ring->base_addr_owner_space);
 894
 895         return 0;
 896 }
 897
 898 static struct ath10k_ce_ring *
 899 ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
 900                          const struct ce_attr *attr)
 901 {
 902         struct ath10k_ce_ring *src_ring;
 903         u32 nentries = attr->src_nentries;
 904         dma_addr_t base_addr;
 905
 906         nentries = roundup_pow_of_two(nentries);
 907
 908         src_ring = kzalloc(sizeof(*src_ring) +
 909                            (nentries *
 910                             sizeof(*src_ring->per_transfer_context)),
 911                            GFP_KERNEL);
 912         if (src_ring == NULL)
 913                 return ERR_PTR(-ENOMEM);
 914
 915         src_ring->nentries = nentries;
 916         src_ring->nentries_mask = nentries - 1;
 917
 918         /*
 919          * Legacy platforms that do not support cache
 920          * coherent DMA are unsupported
 921          */
 922         src_ring->base_addr_owner_space_unaligned =
 923                 dma_alloc_coherent(ar->dev,
 924                                    (nentries * sizeof(struct ce_desc) +
 925                                     CE_DESC_RING_ALIGN),
 926                                    &base_addr, GFP_KERNEL);
 927         if (!src_ring->base_addr_owner_space_unaligned) {
 928                 kfree(src_ring);
 929                 return ERR_PTR(-ENOMEM);
 930         }
 931
 932         src_ring->base_addr_ce_space_unaligned = base_addr;
 933
 934         src_ring->base_addr_owner_space = PTR_ALIGN(
 935                         src_ring->base_addr_owner_space_unaligned,
 936                         CE_DESC_RING_ALIGN);
 937         src_ring->base_addr_ce_space = ALIGN(
 938                         src_ring->base_addr_ce_space_unaligned,
 939                         CE_DESC_RING_ALIGN);
 940
 941         /*
 942          * Also allocate a shadow src ring in regular
 943          * mem to use for faster access.
 944          */
 945         src_ring->shadow_base_unaligned =
 946                 kmalloc((nentries * sizeof(struct ce_desc) +
 947                          CE_DESC_RING_ALIGN), GFP_KERNEL);
 948         if (!src_ring->shadow_base_unaligned) {
 949                 dma_free_coherent(ar->dev,
 950                                   (nentries * sizeof(struct ce_desc) +
 951                                    CE_DESC_RING_ALIGN),
 952                                   src_ring->base_addr_owner_space,
 953                                   src_ring->base_addr_ce_space);
 954                 kfree(src_ring);
 955                 return ERR_PTR(-ENOMEM);
 956         }
 957
 958         src_ring->shadow_base = PTR_ALIGN(
 959                         src_ring->shadow_base_unaligned,
 960                         CE_DESC_RING_ALIGN);
 961
 962         return src_ring;
 963 }
 964
 965 static struct ath10k_ce_ring *
 966 ath10k_ce_alloc_dest_ring(struct ath10k *ar, unsigned int ce_id,
 967                           const struct ce_attr *attr)
 968 {
 969         struct ath10k_ce_ring *dest_ring;
 970         u32 nentries;
 971         dma_addr_t base_addr;
 972
 973         nentries = roundup_pow_of_two(attr->dest_nentries);
 974
 975         dest_ring = kzalloc(sizeof(*dest_ring) +
 976                             (nentries *
 977                              sizeof(*dest_ring->per_transfer_context)),
 978                             GFP_KERNEL);
 979         if (dest_ring == NULL)
 980                 return ERR_PTR(-ENOMEM);
 981
 982         dest_ring->nentries = nentries;
 983         dest_ring->nentries_mask = nentries - 1;
 984
 985         /*
 986          * Legacy platforms that do not support cache
 987          * coherent DMA are unsupported
 988          */
 989         dest_ring->base_addr_owner_space_unaligned =
 990                 dma_alloc_coherent(ar->dev,
 991                                    (nentries * sizeof(struct ce_desc) +
 992                                     CE_DESC_RING_ALIGN),
 993                                    &base_addr, GFP_KERNEL);
 994         if (!dest_ring->base_addr_owner_space_unaligned) {
 995                 kfree(dest_ring);
 996                 return ERR_PTR(-ENOMEM);
 997         }
 998
 999         dest_ring->base_addr_ce_space_unaligned = base_addr;
1000
1001         /*
1002          * Correctly initialize memory to 0 to prevent garbage
1003          * data crashing system when download firmware
1004          */
1005         memset(dest_ring->base_addr_owner_space_unaligned, 0,
1006                nentries * sizeof(struct ce_desc) + CE_DESC_RING_ALIGN);
1007
1008         dest_ring->base_addr_owner_space = PTR_ALIGN(
1009                         dest_ring->base_addr_owner_space_unaligned,
1010                         CE_DESC_RING_ALIGN);
1011         dest_ring->base_addr_ce_space = ALIGN(
1012                         dest_ring->base_addr_ce_space_unaligned,
1013                         CE_DESC_RING_ALIGN);
1014
1015         return dest_ring;
1016 }
1017
1018 /*
1019  * Initialize a Copy Engine based on caller-supplied attributes.
1020  * This may be called once to initialize both source and destination
1021  * rings or it may be called twice for separate source and destination
1022  * initialization. It may be that only one side or the other is
1023  * initialized by software/firmware.
1024  */
1025 int ath10k_ce_init_pipe(struct ath10k *ar, unsigned int ce_id,
1026                         const struct ce_attr *attr)
1027 {
1028         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
1029         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
1030         int ret;
1031
1032         /*
1033          * Make sure there's enough CE ringbuffer entries for HTT TX to avoid
1034          * additional TX locking checks.
1035          *
1036          * For the lack of a better place do the check here.
1037          */
1038         BUILD_BUG_ON(2*TARGET_NUM_MSDU_DESC >
1039                      (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
1040         BUILD_BUG_ON(2*TARGET_10X_NUM_MSDU_DESC >
1041                      (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
1042
1043         spin_lock_bh(&ar_pci->ce_lock);
1044         ce_state->ar = ar;
1045         ce_state->id = ce_id;
1046         ce_state->ctrl_addr = ath10k_ce_base_address(ce_id);
1047         ce_state->attr_flags = attr->flags;
1048         ce_state->src_sz_max = attr->src_sz_max;
1049         spin_unlock_bh(&ar_pci->ce_lock);
1050
1051         if (attr->src_nentries) {
1052                 ret = ath10k_ce_init_src_ring(ar, ce_id, attr);
1053                 if (ret) {
1054                         ath10k_err("Failed to initialize CE src ring for ID: %d (%d)\n",
1055                                    ce_id, ret);
1056                         return ret;
1057                 }
1058         }
1059
1060         if (attr->dest_nentries) {
1061                 ret = ath10k_ce_init_dest_ring(ar, ce_id, attr);
1062                 if (ret) {
1063                         ath10k_err("Failed to initialize CE dest ring for ID: %d (%d)\n",
1064                                    ce_id, ret);
1065                         return ret;
1066                 }
1067         }
1068
1069         return 0;
1070 }
1071
1072 static void ath10k_ce_deinit_src_ring(struct ath10k *ar, unsigned int ce_id)
1073 {
1074         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
1075
1076         ath10k_ce_src_ring_base_addr_set(ar, ctrl_addr, 0);
1077         ath10k_ce_src_ring_size_set(ar, ctrl_addr, 0);
1078         ath10k_ce_src_ring_dmax_set(ar, ctrl_addr, 0);
1079         ath10k_ce_src_ring_highmark_set(ar, ctrl_addr, 0);
1080 }
1081
1082 static void ath10k_ce_deinit_dest_ring(struct ath10k *ar, unsigned int ce_id)
1083 {
1084         u32 ctrl_addr = ath10k_ce_base_address(ce_id);
1085
1086         ath10k_ce_dest_ring_base_addr_set(ar, ctrl_addr, 0);
1087         ath10k_ce_dest_ring_size_set(ar, ctrl_addr, 0);
1088         ath10k_ce_dest_ring_highmark_set(ar, ctrl_addr, 0);
1089 }
1090
1091 void ath10k_ce_deinit_pipe(struct ath10k *ar, unsigned int ce_id)
1092 {
1093         ath10k_ce_deinit_src_ring(ar, ce_id);
1094         ath10k_ce_deinit_dest_ring(ar, ce_id);
1095 }
1096
1097 int ath10k_ce_alloc_pipe(struct ath10k *ar, int ce_id,
1098                          const struct ce_attr *attr)
1099 {
1100         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
1101         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
1102         int ret;
1103
1104         if (attr->src_nentries) {
1105                 ce_state->src_ring = ath10k_ce_alloc_src_ring(ar, ce_id, attr);
1106                 if (IS_ERR(ce_state->src_ring)) {
1107                         ret = PTR_ERR(ce_state->src_ring);
1108                         ath10k_err("failed to allocate copy engine source ring %d: %d\n",
1109                                    ce_id, ret);
1110                         ce_state->src_ring = NULL;
1111                         return ret;
1112                 }
1113         }
1114
1115         if (attr->dest_nentries) {
1116                 ce_state->dest_ring = ath10k_ce_alloc_dest_ring(ar, ce_id,
1117                                                                 attr);
1118                 if (IS_ERR(ce_state->dest_ring)) {
1119                         ret = PTR_ERR(ce_state->dest_ring);
1120                         ath10k_err("failed to allocate copy engine destination ring %d: %d\n",
1121                                    ce_id, ret);
1122                         ce_state->dest_ring = NULL;
1123                         return ret;
1124                 }
1125         }
1126
1127         return 0;
1128 }
1129
1130 void ath10k_ce_free_pipe(struct ath10k *ar, int ce_id)
1131 {
1132         struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
1133         struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
1134
1135         if (ce_state->src_ring) {
1136                 kfree(ce_state->src_ring->shadow_base_unaligned);
1137                 dma_free_coherent(ar->dev,
1138                                   (ce_state->src_ring->nentries *
1139                                    sizeof(struct ce_desc) +
1140                                    CE_DESC_RING_ALIGN),
1141                                   ce_state->src_ring->base_addr_owner_space,
1142                                   ce_state->src_ring->base_addr_ce_space);
1143                 kfree(ce_state->src_ring);
1144         }
1145
1146         if (ce_state->dest_ring) {
1147                 dma_free_coherent(ar->dev,
1148                                   (ce_state->dest_ring->nentries *
1149                                    sizeof(struct ce_desc) +
1150                                    CE_DESC_RING_ALIGN),
1151                                   ce_state->dest_ring->base_addr_owner_space,
1152                                   ce_state->dest_ring->base_addr_ce_space);
1153                 kfree(ce_state->dest_ring);
1154         }
1155
1156         ce_state->src_ring = NULL;
1157         ce_state->dest_ring = NULL;
1158 }