drivers/dma/bcm-sba-raid.c

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This source file includes following definitions.
sba_cmd_enc
sba_cmd_load_c_mdata
sba_cmd_write_c_mdata
sba_cmd_xor_c_mdata
sba_cmd_pq_c_mdata
sba_alloc_request
_sba_pending_request
_sba_active_request
_sba_abort_request
_sba_free_request
sba_free_chained_requests
sba_chain_request
sba_cleanup_nonpending_requests
sba_cleanup_pending_requests
sba_send_mbox_request
_sba_process_pending_requests
sba_process_received_request
sba_write_stats_in_seqfile
sba_free_chan_resources
sba_device_terminate_all
sba_issue_pending
sba_tx_submit
sba_tx_status
sba_fillup_interrupt_msg
sba_prep_dma_interrupt
sba_fillup_memcpy_msg
sba_prep_dma_memcpy_req
sba_prep_dma_memcpy
sba_fillup_xor_msg
sba_prep_dma_xor_req
sba_prep_dma_xor
sba_fillup_pq_msg
sba_prep_dma_pq_req
sba_fillup_pq_single_msg
sba_prep_dma_pq_single_req
sba_prep_dma_pq
sba_receive_message
sba_debugfs_stats_show
sba_prealloc_channel_resources
sba_freeup_channel_resources
sba_async_register
sba_probe
sba_remove
   1 /*
   2  * Copyright (C) 2017 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation version 2.
   7  *
   8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   9  * kind, whether express or implied; without even the implied warranty
  10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13 
  14 /*
  15  * Broadcom SBA RAID Driver
  16  *
  17  * The Broadcom stream buffer accelerator (SBA) provides offloading
  18  * capabilities for RAID operations. The SBA offload engine is accessible
  19  * via Broadcom SoC specific ring manager. Two or more offload engines
  20  * can share same Broadcom SoC specific ring manager due to this Broadcom
  21  * SoC specific ring manager driver is implemented as a mailbox controller
  22  * driver and offload engine drivers are implemented as mallbox clients.
  23  *
  24  * Typically, Broadcom SoC specific ring manager will implement larger
  25  * number of hardware rings over one or more SBA hardware devices. By
  26  * design, the internal buffer size of SBA hardware device is limited
  27  * but all offload operations supported by SBA can be broken down into
  28  * multiple small size requests and executed parallely on multiple SBA
  29  * hardware devices for achieving high through-put.
  30  *
  31  * The Broadcom SBA RAID driver does not require any register programming
  32  * except submitting request to SBA hardware device via mailbox channels.
  33  * This driver implements a DMA device with one DMA channel using a single
  34  * mailbox channel provided by Broadcom SoC specific ring manager driver.
  35  * For having more SBA DMA channels, we can create more SBA device nodes
  36  * in Broadcom SoC specific DTS based on number of hardware rings supported
  37  * by Broadcom SoC ring manager.
  38  */
  39 
  40 #include <linux/bitops.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/dmaengine.h>
  44 #include <linux/list.h>
  45 #include <linux/mailbox_client.h>
  46 #include <linux/mailbox/brcm-message.h>
  47 #include <linux/module.h>
  48 #include <linux/of_device.h>
  49 #include <linux/slab.h>
  50 #include <linux/raid/pq.h>
  51 
  52 #include "dmaengine.h"
  53 
  54 /* ====== Driver macros and defines ===== */
  55 
  56 #define SBA_TYPE_SHIFT                                  48
  57 #define SBA_TYPE_MASK                                   GENMASK(1, 0)
  58 #define SBA_TYPE_A                                      0x0
  59 #define SBA_TYPE_B                                      0x2
  60 #define SBA_TYPE_C                                      0x3
  61 #define SBA_USER_DEF_SHIFT                              32
  62 #define SBA_USER_DEF_MASK                               GENMASK(15, 0)
  63 #define SBA_R_MDATA_SHIFT                               24
  64 #define SBA_R_MDATA_MASK                                GENMASK(7, 0)
  65 #define SBA_C_MDATA_MS_SHIFT                            18
  66 #define SBA_C_MDATA_MS_MASK                             GENMASK(1, 0)
  67 #define SBA_INT_SHIFT                                   17
  68 #define SBA_INT_MASK                                    BIT(0)
  69 #define SBA_RESP_SHIFT                                  16
  70 #define SBA_RESP_MASK                                   BIT(0)
  71 #define SBA_C_MDATA_SHIFT                               8
  72 #define SBA_C_MDATA_MASK                                GENMASK(7, 0)
  73 #define SBA_C_MDATA_BNUMx_SHIFT(__bnum)                 (2 * (__bnum))
  74 #define SBA_C_MDATA_BNUMx_MASK                          GENMASK(1, 0)
  75 #define SBA_C_MDATA_DNUM_SHIFT                          5
  76 #define SBA_C_MDATA_DNUM_MASK                           GENMASK(4, 0)
  77 #define SBA_C_MDATA_LS(__v)                             ((__v) & 0xff)
  78 #define SBA_C_MDATA_MS(__v)                             (((__v) >> 8) & 0x3)
  79 #define SBA_CMD_SHIFT                                   0
  80 #define SBA_CMD_MASK                                    GENMASK(3, 0)
  81 #define SBA_CMD_ZERO_BUFFER                             0x4
  82 #define SBA_CMD_ZERO_ALL_BUFFERS                        0x8
  83 #define SBA_CMD_LOAD_BUFFER                             0x9
  84 #define SBA_CMD_XOR                                     0xa
  85 #define SBA_CMD_GALOIS_XOR                              0xb
  86 #define SBA_CMD_WRITE_BUFFER                            0xc
  87 #define SBA_CMD_GALOIS                                  0xe
  88 
  89 #define SBA_MAX_REQ_PER_MBOX_CHANNEL                    8192
  90 #define SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL               8
  91 
  92 /* Driver helper macros */
  93 #define to_sba_request(tx)              \
  94         container_of(tx, struct sba_request, tx)
  95 #define to_sba_device(dchan)            \
  96         container_of(dchan, struct sba_device, dma_chan)
  97 
  98 /* ===== Driver data structures ===== */
  99 
 100 enum sba_request_flags {
 101         SBA_REQUEST_STATE_FREE          = 0x001,
 102         SBA_REQUEST_STATE_ALLOCED       = 0x002,
 103         SBA_REQUEST_STATE_PENDING       = 0x004,
 104         SBA_REQUEST_STATE_ACTIVE        = 0x008,
 105         SBA_REQUEST_STATE_ABORTED       = 0x010,
 106         SBA_REQUEST_STATE_MASK          = 0x0ff,
 107         SBA_REQUEST_FENCE               = 0x100,
 108 };
 109 
 110 struct sba_request {
 111         /* Global state */
 112         struct list_head node;
 113         struct sba_device *sba;
 114         u32 flags;
 115         /* Chained requests management */
 116         struct sba_request *first;
 117         struct list_head next;
 118         atomic_t next_pending_count;
 119         /* BRCM message data */
 120         struct brcm_message msg;
 121         struct dma_async_tx_descriptor tx;
 122         /* SBA commands */
 123         struct brcm_sba_command cmds[0];
 124 };
 125 
 126 enum sba_version {
 127         SBA_VER_1 = 0,
 128         SBA_VER_2
 129 };
 130 
 131 struct sba_device {
 132         /* Underlying device */
 133         struct device *dev;
 134         /* DT configuration parameters */
 135         enum sba_version ver;
 136         /* Derived configuration parameters */
 137         u32 max_req;
 138         u32 hw_buf_size;
 139         u32 hw_resp_size;
 140         u32 max_pq_coefs;
 141         u32 max_pq_srcs;
 142         u32 max_cmd_per_req;
 143         u32 max_xor_srcs;
 144         u32 max_resp_pool_size;
 145         u32 max_cmds_pool_size;
 146         /* Maibox client and Mailbox channels */
 147         struct mbox_client client;
 148         struct mbox_chan *mchan;
 149         struct device *mbox_dev;
 150         /* DMA device and DMA channel */
 151         struct dma_device dma_dev;
 152         struct dma_chan dma_chan;
 153         /* DMA channel resources */
 154         void *resp_base;
 155         dma_addr_t resp_dma_base;
 156         void *cmds_base;
 157         dma_addr_t cmds_dma_base;
 158         spinlock_t reqs_lock;
 159         bool reqs_fence;
 160         struct list_head reqs_alloc_list;
 161         struct list_head reqs_pending_list;
 162         struct list_head reqs_active_list;
 163         struct list_head reqs_aborted_list;
 164         struct list_head reqs_free_list;
 165         /* DebugFS directory entries */
 166         struct dentry *root;
 167 };
 168 
 169 /* ====== Command helper routines ===== */
 170 
 171 static inline u64 __pure sba_cmd_enc(u64 cmd, u32 val, u32 shift, u32 mask)
 172 {
 173         cmd &= ~((u64)mask << shift);
 174         cmd |= ((u64)(val & mask) << shift);
 175         return cmd;
 176 }
 177 
 178 static inline u32 __pure sba_cmd_load_c_mdata(u32 b0)
 179 {
 180         return b0 & SBA_C_MDATA_BNUMx_MASK;
 181 }
 182 
 183 static inline u32 __pure sba_cmd_write_c_mdata(u32 b0)
 184 {
 185         return b0 & SBA_C_MDATA_BNUMx_MASK;
 186 }
 187 
 188 static inline u32 __pure sba_cmd_xor_c_mdata(u32 b1, u32 b0)
 189 {
 190         return (b0 & SBA_C_MDATA_BNUMx_MASK) |
 191                ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1));
 192 }
 193 
 194 static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0)
 195 {
 196         return (b0 & SBA_C_MDATA_BNUMx_MASK) |
 197                ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)) |
 198                ((d & SBA_C_MDATA_DNUM_MASK) << SBA_C_MDATA_DNUM_SHIFT);
 199 }
 200 
 201 /* ====== General helper routines ===== */
 202 
 203 static struct sba_request *sba_alloc_request(struct sba_device *sba)
 204 {
 205         bool found = false;
 206         unsigned long flags;
 207         struct sba_request *req = NULL;
 208 
 209         spin_lock_irqsave(&sba->reqs_lock, flags);
 210         list_for_each_entry(req, &sba->reqs_free_list, node) {
 211                 if (async_tx_test_ack(&req->tx)) {
 212                         list_move_tail(&req->node, &sba->reqs_alloc_list);
 213                         found = true;
 214                         break;
 215                 }
 216         }
 217         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 218 
 219         if (!found) {
 220                 /*
 221                  * We have no more free requests so, we peek
 222                  * mailbox channels hoping few active requests
 223                  * would have completed which will create more
 224                  * room for new requests.
 225                  */
 226                 mbox_client_peek_data(sba->mchan);
 227                 return NULL;
 228         }
 229 
 230         req->flags = SBA_REQUEST_STATE_ALLOCED;
 231         req->first = req;
 232         INIT_LIST_HEAD(&req->next);
 233         atomic_set(&req->next_pending_count, 1);
 234 
 235         dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
 236         async_tx_ack(&req->tx);
 237 
 238         return req;
 239 }
 240 
 241 /* Note: Must be called with sba->reqs_lock held */
 242 static void _sba_pending_request(struct sba_device *sba,
 243                                  struct sba_request *req)
 244 {
 245         lockdep_assert_held(&sba->reqs_lock);
 246         req->flags &= ~SBA_REQUEST_STATE_MASK;
 247         req->flags |= SBA_REQUEST_STATE_PENDING;
 248         list_move_tail(&req->node, &sba->reqs_pending_list);
 249         if (list_empty(&sba->reqs_active_list))
 250                 sba->reqs_fence = false;
 251 }
 252 
 253 /* Note: Must be called with sba->reqs_lock held */
 254 static bool _sba_active_request(struct sba_device *sba,
 255                                 struct sba_request *req)
 256 {
 257         lockdep_assert_held(&sba->reqs_lock);
 258         if (list_empty(&sba->reqs_active_list))
 259                 sba->reqs_fence = false;
 260         if (sba->reqs_fence)
 261                 return false;
 262         req->flags &= ~SBA_REQUEST_STATE_MASK;
 263         req->flags |= SBA_REQUEST_STATE_ACTIVE;
 264         list_move_tail(&req->node, &sba->reqs_active_list);
 265         if (req->flags & SBA_REQUEST_FENCE)
 266                 sba->reqs_fence = true;
 267         return true;
 268 }
 269 
 270 /* Note: Must be called with sba->reqs_lock held */
 271 static void _sba_abort_request(struct sba_device *sba,
 272                                struct sba_request *req)
 273 {
 274         lockdep_assert_held(&sba->reqs_lock);
 275         req->flags &= ~SBA_REQUEST_STATE_MASK;
 276         req->flags |= SBA_REQUEST_STATE_ABORTED;
 277         list_move_tail(&req->node, &sba->reqs_aborted_list);
 278         if (list_empty(&sba->reqs_active_list))
 279                 sba->reqs_fence = false;
 280 }
 281 
 282 /* Note: Must be called with sba->reqs_lock held */
 283 static void _sba_free_request(struct sba_device *sba,
 284                               struct sba_request *req)
 285 {
 286         lockdep_assert_held(&sba->reqs_lock);
 287         req->flags &= ~SBA_REQUEST_STATE_MASK;
 288         req->flags |= SBA_REQUEST_STATE_FREE;
 289         list_move_tail(&req->node, &sba->reqs_free_list);
 290         if (list_empty(&sba->reqs_active_list))
 291                 sba->reqs_fence = false;
 292 }
 293 
 294 static void sba_free_chained_requests(struct sba_request *req)
 295 {
 296         unsigned long flags;
 297         struct sba_request *nreq;
 298         struct sba_device *sba = req->sba;
 299 
 300         spin_lock_irqsave(&sba->reqs_lock, flags);
 301 
 302         _sba_free_request(sba, req);
 303         list_for_each_entry(nreq, &req->next, next)
 304                 _sba_free_request(sba, nreq);
 305 
 306         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 307 }
 308 
 309 static void sba_chain_request(struct sba_request *first,
 310                               struct sba_request *req)
 311 {
 312         unsigned long flags;
 313         struct sba_device *sba = req->sba;
 314 
 315         spin_lock_irqsave(&sba->reqs_lock, flags);
 316 
 317         list_add_tail(&req->next, &first->next);
 318         req->first = first;
 319         atomic_inc(&first->next_pending_count);
 320 
 321         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 322 }
 323 
 324 static void sba_cleanup_nonpending_requests(struct sba_device *sba)
 325 {
 326         unsigned long flags;
 327         struct sba_request *req, *req1;
 328 
 329         spin_lock_irqsave(&sba->reqs_lock, flags);
 330 
 331         /* Freeup all alloced request */
 332         list_for_each_entry_safe(req, req1, &sba->reqs_alloc_list, node)
 333                 _sba_free_request(sba, req);
 334 
 335         /* Set all active requests as aborted */
 336         list_for_each_entry_safe(req, req1, &sba->reqs_active_list, node)
 337                 _sba_abort_request(sba, req);
 338 
 339         /*
 340          * Note: We expect that aborted request will be eventually
 341          * freed by sba_receive_message()
 342          */
 343 
 344         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 345 }
 346 
 347 static void sba_cleanup_pending_requests(struct sba_device *sba)
 348 {
 349         unsigned long flags;
 350         struct sba_request *req, *req1;
 351 
 352         spin_lock_irqsave(&sba->reqs_lock, flags);
 353 
 354         /* Freeup all pending request */
 355         list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node)
 356                 _sba_free_request(sba, req);
 357 
 358         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 359 }
 360 
 361 static int sba_send_mbox_request(struct sba_device *sba,
 362                                  struct sba_request *req)
 363 {
 364         int ret = 0;
 365 
 366         /* Send message for the request */
 367         req->msg.error = 0;
 368         ret = mbox_send_message(sba->mchan, &req->msg);
 369         if (ret < 0) {
 370                 dev_err(sba->dev, "send message failed with error %d", ret);
 371                 return ret;
 372         }
 373 
 374         /* Check error returned by mailbox controller */
 375         ret = req->msg.error;
 376         if (ret < 0) {
 377                 dev_err(sba->dev, "message error %d", ret);
 378         }
 379 
 380         /* Signal txdone for mailbox channel */
 381         mbox_client_txdone(sba->mchan, ret);
 382 
 383         return ret;
 384 }
 385 
 386 /* Note: Must be called with sba->reqs_lock held */
 387 static void _sba_process_pending_requests(struct sba_device *sba)
 388 {
 389         int ret;
 390         u32 count;
 391         struct sba_request *req;
 392 
 393         /* Process few pending requests */
 394         count = SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL;
 395         while (!list_empty(&sba->reqs_pending_list) && count) {
 396                 /* Get the first pending request */
 397                 req = list_first_entry(&sba->reqs_pending_list,
 398                                        struct sba_request, node);
 399 
 400                 /* Try to make request active */
 401                 if (!_sba_active_request(sba, req))
 402                         break;
 403 
 404                 /* Send request to mailbox channel */
 405                 ret = sba_send_mbox_request(sba, req);
 406                 if (ret < 0) {
 407                         _sba_pending_request(sba, req);
 408                         break;
 409                 }
 410 
 411                 count--;
 412         }
 413 }
 414 
 415 static void sba_process_received_request(struct sba_device *sba,
 416                                          struct sba_request *req)
 417 {
 418         unsigned long flags;
 419         struct dma_async_tx_descriptor *tx;
 420         struct sba_request *nreq, *first = req->first;
 421 
 422         /* Process only after all chained requests are received */
 423         if (!atomic_dec_return(&first->next_pending_count)) {
 424                 tx = &first->tx;
 425 
 426                 WARN_ON(tx->cookie < 0);
 427                 if (tx->cookie > 0) {
 428                         spin_lock_irqsave(&sba->reqs_lock, flags);
 429                         dma_cookie_complete(tx);
 430                         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 431                         dmaengine_desc_get_callback_invoke(tx, NULL);
 432                         dma_descriptor_unmap(tx);
 433                         tx->callback = NULL;
 434                         tx->callback_result = NULL;
 435                 }
 436 
 437                 dma_run_dependencies(tx);
 438 
 439                 spin_lock_irqsave(&sba->reqs_lock, flags);
 440 
 441                 /* Free all requests chained to first request */
 442                 list_for_each_entry(nreq, &first->next, next)
 443                         _sba_free_request(sba, nreq);
 444                 INIT_LIST_HEAD(&first->next);
 445 
 446                 /* Free the first request */
 447                 _sba_free_request(sba, first);
 448 
 449                 /* Process pending requests */
 450                 _sba_process_pending_requests(sba);
 451 
 452                 spin_unlock_irqrestore(&sba->reqs_lock, flags);
 453         }
 454 }
 455 
 456 static void sba_write_stats_in_seqfile(struct sba_device *sba,
 457                                        struct seq_file *file)
 458 {
 459         unsigned long flags;
 460         struct sba_request *req;
 461         u32 free_count = 0, alloced_count = 0;
 462         u32 pending_count = 0, active_count = 0, aborted_count = 0;
 463 
 464         spin_lock_irqsave(&sba->reqs_lock, flags);
 465 
 466         list_for_each_entry(req, &sba->reqs_free_list, node)
 467                 if (async_tx_test_ack(&req->tx))
 468                         free_count++;
 469 
 470         list_for_each_entry(req, &sba->reqs_alloc_list, node)
 471                 alloced_count++;
 472 
 473         list_for_each_entry(req, &sba->reqs_pending_list, node)
 474                 pending_count++;
 475 
 476         list_for_each_entry(req, &sba->reqs_active_list, node)
 477                 active_count++;
 478 
 479         list_for_each_entry(req, &sba->reqs_aborted_list, node)
 480                 aborted_count++;
 481 
 482         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 483 
 484         seq_printf(file, "maximum requests   = %d\n", sba->max_req);
 485         seq_printf(file, "free requests      = %d\n", free_count);
 486         seq_printf(file, "alloced requests   = %d\n", alloced_count);
 487         seq_printf(file, "pending requests   = %d\n", pending_count);
 488         seq_printf(file, "active requests    = %d\n", active_count);
 489         seq_printf(file, "aborted requests   = %d\n", aborted_count);
 490 }
 491 
 492 /* ====== DMAENGINE callbacks ===== */
 493 
 494 static void sba_free_chan_resources(struct dma_chan *dchan)
 495 {
 496         /*
 497          * Channel resources are pre-alloced so we just free-up
 498          * whatever we can so that we can re-use pre-alloced
 499          * channel resources next time.
 500          */
 501         sba_cleanup_nonpending_requests(to_sba_device(dchan));
 502 }
 503 
 504 static int sba_device_terminate_all(struct dma_chan *dchan)
 505 {
 506         /* Cleanup all pending requests */
 507         sba_cleanup_pending_requests(to_sba_device(dchan));
 508 
 509         return 0;
 510 }
 511 
 512 static void sba_issue_pending(struct dma_chan *dchan)
 513 {
 514         unsigned long flags;
 515         struct sba_device *sba = to_sba_device(dchan);
 516 
 517         /* Process pending requests */
 518         spin_lock_irqsave(&sba->reqs_lock, flags);
 519         _sba_process_pending_requests(sba);
 520         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 521 }
 522 
 523 static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx)
 524 {
 525         unsigned long flags;
 526         dma_cookie_t cookie;
 527         struct sba_device *sba;
 528         struct sba_request *req, *nreq;
 529 
 530         if (unlikely(!tx))
 531                 return -EINVAL;
 532 
 533         sba = to_sba_device(tx->chan);
 534         req = to_sba_request(tx);
 535 
 536         /* Assign cookie and mark all chained requests pending */
 537         spin_lock_irqsave(&sba->reqs_lock, flags);
 538         cookie = dma_cookie_assign(tx);
 539         _sba_pending_request(sba, req);
 540         list_for_each_entry(nreq, &req->next, next)
 541                 _sba_pending_request(sba, nreq);
 542         spin_unlock_irqrestore(&sba->reqs_lock, flags);
 543 
 544         return cookie;
 545 }
 546 
 547 static enum dma_status sba_tx_status(struct dma_chan *dchan,
 548                                      dma_cookie_t cookie,
 549                                      struct dma_tx_state *txstate)
 550 {
 551         enum dma_status ret;
 552         struct sba_device *sba = to_sba_device(dchan);
 553 
 554         ret = dma_cookie_status(dchan, cookie, txstate);
 555         if (ret == DMA_COMPLETE)
 556                 return ret;
 557 
 558         mbox_client_peek_data(sba->mchan);
 559 
 560         return dma_cookie_status(dchan, cookie, txstate);
 561 }
 562 
 563 static void sba_fillup_interrupt_msg(struct sba_request *req,
 564                                      struct brcm_sba_command *cmds,
 565                                      struct brcm_message *msg)
 566 {
 567         u64 cmd;
 568         u32 c_mdata;
 569         dma_addr_t resp_dma = req->tx.phys;
 570         struct brcm_sba_command *cmdsp = cmds;
 571 
 572         /* Type-B command to load dummy data into buf0 */
 573         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 574                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 575         cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size,
 576                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 577         c_mdata = sba_cmd_load_c_mdata(0);
 578         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 579                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 580         cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
 581                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 582         cmdsp->cmd = cmd;
 583         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 584         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 585         cmdsp->data = resp_dma;
 586         cmdsp->data_len = req->sba->hw_resp_size;
 587         cmdsp++;
 588 
 589         /* Type-A command to write buf0 to dummy location */
 590         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
 591                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 592         cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size,
 593                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 594         cmd = sba_cmd_enc(cmd, 0x1,
 595                           SBA_RESP_SHIFT, SBA_RESP_MASK);
 596         c_mdata = sba_cmd_write_c_mdata(0);
 597         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 598                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 599         cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
 600                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 601         cmdsp->cmd = cmd;
 602         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 603         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
 604         if (req->sba->hw_resp_size) {
 605                 cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
 606                 cmdsp->resp = resp_dma;
 607                 cmdsp->resp_len = req->sba->hw_resp_size;
 608         }
 609         cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
 610         cmdsp->data = resp_dma;
 611         cmdsp->data_len = req->sba->hw_resp_size;
 612         cmdsp++;
 613 
 614         /* Fillup brcm_message */
 615         msg->type = BRCM_MESSAGE_SBA;
 616         msg->sba.cmds = cmds;
 617         msg->sba.cmds_count = cmdsp - cmds;
 618         msg->ctx = req;
 619         msg->error = 0;
 620 }
 621 
 622 static struct dma_async_tx_descriptor *
 623 sba_prep_dma_interrupt(struct dma_chan *dchan, unsigned long flags)
 624 {
 625         struct sba_request *req = NULL;
 626         struct sba_device *sba = to_sba_device(dchan);
 627 
 628         /* Alloc new request */
 629         req = sba_alloc_request(sba);
 630         if (!req)
 631                 return NULL;
 632 
 633         /*
 634          * Force fence so that no requests are submitted
 635          * until DMA callback for this request is invoked.
 636          */
 637         req->flags |= SBA_REQUEST_FENCE;
 638 
 639         /* Fillup request message */
 640         sba_fillup_interrupt_msg(req, req->cmds, &req->msg);
 641 
 642         /* Init async_tx descriptor */
 643         req->tx.flags = flags;
 644         req->tx.cookie = -EBUSY;
 645 
 646         return &req->tx;
 647 }
 648 
 649 static void sba_fillup_memcpy_msg(struct sba_request *req,
 650                                   struct brcm_sba_command *cmds,
 651                                   struct brcm_message *msg,
 652                                   dma_addr_t msg_offset, size_t msg_len,
 653                                   dma_addr_t dst, dma_addr_t src)
 654 {
 655         u64 cmd;
 656         u32 c_mdata;
 657         dma_addr_t resp_dma = req->tx.phys;
 658         struct brcm_sba_command *cmdsp = cmds;
 659 
 660         /* Type-B command to load data into buf0 */
 661         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 662                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 663         cmd = sba_cmd_enc(cmd, msg_len,
 664                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 665         c_mdata = sba_cmd_load_c_mdata(0);
 666         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 667                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 668         cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
 669                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 670         cmdsp->cmd = cmd;
 671         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 672         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 673         cmdsp->data = src + msg_offset;
 674         cmdsp->data_len = msg_len;
 675         cmdsp++;
 676 
 677         /* Type-A command to write buf0 */
 678         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
 679                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 680         cmd = sba_cmd_enc(cmd, msg_len,
 681                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 682         cmd = sba_cmd_enc(cmd, 0x1,
 683                           SBA_RESP_SHIFT, SBA_RESP_MASK);
 684         c_mdata = sba_cmd_write_c_mdata(0);
 685         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 686                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 687         cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
 688                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 689         cmdsp->cmd = cmd;
 690         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 691         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
 692         if (req->sba->hw_resp_size) {
 693                 cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
 694                 cmdsp->resp = resp_dma;
 695                 cmdsp->resp_len = req->sba->hw_resp_size;
 696         }
 697         cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
 698         cmdsp->data = dst + msg_offset;
 699         cmdsp->data_len = msg_len;
 700         cmdsp++;
 701 
 702         /* Fillup brcm_message */
 703         msg->type = BRCM_MESSAGE_SBA;
 704         msg->sba.cmds = cmds;
 705         msg->sba.cmds_count = cmdsp - cmds;
 706         msg->ctx = req;
 707         msg->error = 0;
 708 }
 709 
 710 static struct sba_request *
 711 sba_prep_dma_memcpy_req(struct sba_device *sba,
 712                         dma_addr_t off, dma_addr_t dst, dma_addr_t src,
 713                         size_t len, unsigned long flags)
 714 {
 715         struct sba_request *req = NULL;
 716 
 717         /* Alloc new request */
 718         req = sba_alloc_request(sba);
 719         if (!req)
 720                 return NULL;
 721         if (flags & DMA_PREP_FENCE)
 722                 req->flags |= SBA_REQUEST_FENCE;
 723 
 724         /* Fillup request message */
 725         sba_fillup_memcpy_msg(req, req->cmds, &req->msg,
 726                               off, len, dst, src);
 727 
 728         /* Init async_tx descriptor */
 729         req->tx.flags = flags;
 730         req->tx.cookie = -EBUSY;
 731 
 732         return req;
 733 }
 734 
 735 static struct dma_async_tx_descriptor *
 736 sba_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src,
 737                     size_t len, unsigned long flags)
 738 {
 739         size_t req_len;
 740         dma_addr_t off = 0;
 741         struct sba_device *sba = to_sba_device(dchan);
 742         struct sba_request *first = NULL, *req;
 743 
 744         /* Create chained requests where each request is upto hw_buf_size */
 745         while (len) {
 746                 req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
 747 
 748                 req = sba_prep_dma_memcpy_req(sba, off, dst, src,
 749                                               req_len, flags);
 750                 if (!req) {
 751                         if (first)
 752                                 sba_free_chained_requests(first);
 753                         return NULL;
 754                 }
 755 
 756                 if (first)
 757                         sba_chain_request(first, req);
 758                 else
 759                         first = req;
 760 
 761                 off += req_len;
 762                 len -= req_len;
 763         }
 764 
 765         return (first) ? &first->tx : NULL;
 766 }
 767 
 768 static void sba_fillup_xor_msg(struct sba_request *req,
 769                                 struct brcm_sba_command *cmds,
 770                                 struct brcm_message *msg,
 771                                 dma_addr_t msg_offset, size_t msg_len,
 772                                 dma_addr_t dst, dma_addr_t *src, u32 src_cnt)
 773 {
 774         u64 cmd;
 775         u32 c_mdata;
 776         unsigned int i;
 777         dma_addr_t resp_dma = req->tx.phys;
 778         struct brcm_sba_command *cmdsp = cmds;
 779 
 780         /* Type-B command to load data into buf0 */
 781         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 782                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 783         cmd = sba_cmd_enc(cmd, msg_len,
 784                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 785         c_mdata = sba_cmd_load_c_mdata(0);
 786         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 787                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 788         cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
 789                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 790         cmdsp->cmd = cmd;
 791         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 792         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 793         cmdsp->data = src[0] + msg_offset;
 794         cmdsp->data_len = msg_len;
 795         cmdsp++;
 796 
 797         /* Type-B commands to xor data with buf0 and put it back in buf0 */
 798         for (i = 1; i < src_cnt; i++) {
 799                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 800                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 801                 cmd = sba_cmd_enc(cmd, msg_len,
 802                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 803                 c_mdata = sba_cmd_xor_c_mdata(0, 0);
 804                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 805                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 806                 cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
 807                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
 808                 cmdsp->cmd = cmd;
 809                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
 810                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 811                 cmdsp->data = src[i] + msg_offset;
 812                 cmdsp->data_len = msg_len;
 813                 cmdsp++;
 814         }
 815 
 816         /* Type-A command to write buf0 */
 817         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
 818                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 819         cmd = sba_cmd_enc(cmd, msg_len,
 820                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 821         cmd = sba_cmd_enc(cmd, 0x1,
 822                           SBA_RESP_SHIFT, SBA_RESP_MASK);
 823         c_mdata = sba_cmd_write_c_mdata(0);
 824         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 825                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 826         cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
 827                           SBA_CMD_SHIFT, SBA_CMD_MASK);
 828         cmdsp->cmd = cmd;
 829         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 830         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
 831         if (req->sba->hw_resp_size) {
 832                 cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
 833                 cmdsp->resp = resp_dma;
 834                 cmdsp->resp_len = req->sba->hw_resp_size;
 835         }
 836         cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
 837         cmdsp->data = dst + msg_offset;
 838         cmdsp->data_len = msg_len;
 839         cmdsp++;
 840 
 841         /* Fillup brcm_message */
 842         msg->type = BRCM_MESSAGE_SBA;
 843         msg->sba.cmds = cmds;
 844         msg->sba.cmds_count = cmdsp - cmds;
 845         msg->ctx = req;
 846         msg->error = 0;
 847 }
 848 
 849 static struct sba_request *
 850 sba_prep_dma_xor_req(struct sba_device *sba,
 851                      dma_addr_t off, dma_addr_t dst, dma_addr_t *src,
 852                      u32 src_cnt, size_t len, unsigned long flags)
 853 {
 854         struct sba_request *req = NULL;
 855 
 856         /* Alloc new request */
 857         req = sba_alloc_request(sba);
 858         if (!req)
 859                 return NULL;
 860         if (flags & DMA_PREP_FENCE)
 861                 req->flags |= SBA_REQUEST_FENCE;
 862 
 863         /* Fillup request message */
 864         sba_fillup_xor_msg(req, req->cmds, &req->msg,
 865                            off, len, dst, src, src_cnt);
 866 
 867         /* Init async_tx descriptor */
 868         req->tx.flags = flags;
 869         req->tx.cookie = -EBUSY;
 870 
 871         return req;
 872 }
 873 
 874 static struct dma_async_tx_descriptor *
 875 sba_prep_dma_xor(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
 876                  u32 src_cnt, size_t len, unsigned long flags)
 877 {
 878         size_t req_len;
 879         dma_addr_t off = 0;
 880         struct sba_device *sba = to_sba_device(dchan);
 881         struct sba_request *first = NULL, *req;
 882 
 883         /* Sanity checks */
 884         if (unlikely(src_cnt > sba->max_xor_srcs))
 885                 return NULL;
 886 
 887         /* Create chained requests where each request is upto hw_buf_size */
 888         while (len) {
 889                 req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
 890 
 891                 req = sba_prep_dma_xor_req(sba, off, dst, src, src_cnt,
 892                                            req_len, flags);
 893                 if (!req) {
 894                         if (first)
 895                                 sba_free_chained_requests(first);
 896                         return NULL;
 897                 }
 898 
 899                 if (first)
 900                         sba_chain_request(first, req);
 901                 else
 902                         first = req;
 903 
 904                 off += req_len;
 905                 len -= req_len;
 906         }
 907 
 908         return (first) ? &first->tx : NULL;
 909 }
 910 
 911 static void sba_fillup_pq_msg(struct sba_request *req,
 912                                 bool pq_continue,
 913                                 struct brcm_sba_command *cmds,
 914                                 struct brcm_message *msg,
 915                                 dma_addr_t msg_offset, size_t msg_len,
 916                                 dma_addr_t *dst_p, dma_addr_t *dst_q,
 917                                 const u8 *scf, dma_addr_t *src, u32 src_cnt)
 918 {
 919         u64 cmd;
 920         u32 c_mdata;
 921         unsigned int i;
 922         dma_addr_t resp_dma = req->tx.phys;
 923         struct brcm_sba_command *cmdsp = cmds;
 924 
 925         if (pq_continue) {
 926                 /* Type-B command to load old P into buf0 */
 927                 if (dst_p) {
 928                         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 929                                 SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 930                         cmd = sba_cmd_enc(cmd, msg_len,
 931                                 SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 932                         c_mdata = sba_cmd_load_c_mdata(0);
 933                         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 934                                 SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 935                         cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
 936                                 SBA_CMD_SHIFT, SBA_CMD_MASK);
 937                         cmdsp->cmd = cmd;
 938                         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 939                         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 940                         cmdsp->data = *dst_p + msg_offset;
 941                         cmdsp->data_len = msg_len;
 942                         cmdsp++;
 943                 }
 944 
 945                 /* Type-B command to load old Q into buf1 */
 946                 if (dst_q) {
 947                         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 948                                 SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 949                         cmd = sba_cmd_enc(cmd, msg_len,
 950                                 SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 951                         c_mdata = sba_cmd_load_c_mdata(1);
 952                         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 953                                 SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 954                         cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
 955                                 SBA_CMD_SHIFT, SBA_CMD_MASK);
 956                         cmdsp->cmd = cmd;
 957                         *cmdsp->cmd_dma = cpu_to_le64(cmd);
 958                         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 959                         cmdsp->data = *dst_q + msg_offset;
 960                         cmdsp->data_len = msg_len;
 961                         cmdsp++;
 962                 }
 963         } else {
 964                 /* Type-A command to zero all buffers */
 965                 cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
 966                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 967                 cmd = sba_cmd_enc(cmd, msg_len,
 968                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 969                 cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS,
 970                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
 971                 cmdsp->cmd = cmd;
 972                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
 973                 cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
 974                 cmdsp++;
 975         }
 976 
 977         /* Type-B commands for generate P onto buf0 and Q onto buf1 */
 978         for (i = 0; i < src_cnt; i++) {
 979                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
 980                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
 981                 cmd = sba_cmd_enc(cmd, msg_len,
 982                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
 983                 c_mdata = sba_cmd_pq_c_mdata(raid6_gflog[scf[i]], 1, 0);
 984                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
 985                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
 986                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
 987                                   SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
 988                 cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS_XOR,
 989                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
 990                 cmdsp->cmd = cmd;
 991                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
 992                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
 993                 cmdsp->data = src[i] + msg_offset;
 994                 cmdsp->data_len = msg_len;
 995                 cmdsp++;
 996         }
 997 
 998         /* Type-A command to write buf0 */
 999         if (dst_p) {
1000                 cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1001                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1002                 cmd = sba_cmd_enc(cmd, msg_len,
1003                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1004                 cmd = sba_cmd_enc(cmd, 0x1,
1005                                   SBA_RESP_SHIFT, SBA_RESP_MASK);
1006                 c_mdata = sba_cmd_write_c_mdata(0);
1007                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1008                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1009                 cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
1010                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1011                 cmdsp->cmd = cmd;
1012                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1013                 cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1014                 if (req->sba->hw_resp_size) {
1015                         cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
1016                         cmdsp->resp = resp_dma;
1017                         cmdsp->resp_len = req->sba->hw_resp_size;
1018                 }
1019                 cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
1020                 cmdsp->data = *dst_p + msg_offset;
1021                 cmdsp->data_len = msg_len;
1022                 cmdsp++;
1023         }
1024 
1025         /* Type-A command to write buf1 */
1026         if (dst_q) {
1027                 cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1028                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1029                 cmd = sba_cmd_enc(cmd, msg_len,
1030                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1031                 cmd = sba_cmd_enc(cmd, 0x1,
1032                                   SBA_RESP_SHIFT, SBA_RESP_MASK);
1033                 c_mdata = sba_cmd_write_c_mdata(1);
1034                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1035                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1036                 cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
1037                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1038                 cmdsp->cmd = cmd;
1039                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1040                 cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1041                 if (req->sba->hw_resp_size) {
1042                         cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
1043                         cmdsp->resp = resp_dma;
1044                         cmdsp->resp_len = req->sba->hw_resp_size;
1045                 }
1046                 cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
1047                 cmdsp->data = *dst_q + msg_offset;
1048                 cmdsp->data_len = msg_len;
1049                 cmdsp++;
1050         }
1051 
1052         /* Fillup brcm_message */
1053         msg->type = BRCM_MESSAGE_SBA;
1054         msg->sba.cmds = cmds;
1055         msg->sba.cmds_count = cmdsp - cmds;
1056         msg->ctx = req;
1057         msg->error = 0;
1058 }
1059 
1060 static struct sba_request *
1061 sba_prep_dma_pq_req(struct sba_device *sba, dma_addr_t off,
1062                     dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t *src,
1063                     u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
1064 {
1065         struct sba_request *req = NULL;
1066 
1067         /* Alloc new request */
1068         req = sba_alloc_request(sba);
1069         if (!req)
1070                 return NULL;
1071         if (flags & DMA_PREP_FENCE)
1072                 req->flags |= SBA_REQUEST_FENCE;
1073 
1074         /* Fillup request messages */
1075         sba_fillup_pq_msg(req, dmaf_continue(flags),
1076                           req->cmds, &req->msg,
1077                           off, len, dst_p, dst_q, scf, src, src_cnt);
1078 
1079         /* Init async_tx descriptor */
1080         req->tx.flags = flags;
1081         req->tx.cookie = -EBUSY;
1082 
1083         return req;
1084 }
1085 
1086 static void sba_fillup_pq_single_msg(struct sba_request *req,
1087                                 bool pq_continue,
1088                                 struct brcm_sba_command *cmds,
1089                                 struct brcm_message *msg,
1090                                 dma_addr_t msg_offset, size_t msg_len,
1091                                 dma_addr_t *dst_p, dma_addr_t *dst_q,
1092                                 dma_addr_t src, u8 scf)
1093 {
1094         u64 cmd;
1095         u32 c_mdata;
1096         u8 pos, dpos = raid6_gflog[scf];
1097         dma_addr_t resp_dma = req->tx.phys;
1098         struct brcm_sba_command *cmdsp = cmds;
1099 
1100         if (!dst_p)
1101                 goto skip_p;
1102 
1103         if (pq_continue) {
1104                 /* Type-B command to load old P into buf0 */
1105                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
1106                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1107                 cmd = sba_cmd_enc(cmd, msg_len,
1108                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1109                 c_mdata = sba_cmd_load_c_mdata(0);
1110                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1111                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1112                 cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
1113                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1114                 cmdsp->cmd = cmd;
1115                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1116                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
1117                 cmdsp->data = *dst_p + msg_offset;
1118                 cmdsp->data_len = msg_len;
1119                 cmdsp++;
1120 
1121                 /*
1122                  * Type-B commands to xor data with buf0 and put it
1123                  * back in buf0
1124                  */
1125                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
1126                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1127                 cmd = sba_cmd_enc(cmd, msg_len,
1128                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1129                 c_mdata = sba_cmd_xor_c_mdata(0, 0);
1130                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1131                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1132                 cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
1133                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1134                 cmdsp->cmd = cmd;
1135                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1136                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
1137                 cmdsp->data = src + msg_offset;
1138                 cmdsp->data_len = msg_len;
1139                 cmdsp++;
1140         } else {
1141                 /* Type-B command to load old P into buf0 */
1142                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
1143                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1144                 cmd = sba_cmd_enc(cmd, msg_len,
1145                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1146                 c_mdata = sba_cmd_load_c_mdata(0);
1147                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1148                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1149                 cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
1150                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1151                 cmdsp->cmd = cmd;
1152                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1153                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
1154                 cmdsp->data = src + msg_offset;
1155                 cmdsp->data_len = msg_len;
1156                 cmdsp++;
1157         }
1158 
1159         /* Type-A command to write buf0 */
1160         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1161                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1162         cmd = sba_cmd_enc(cmd, msg_len,
1163                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1164         cmd = sba_cmd_enc(cmd, 0x1,
1165                           SBA_RESP_SHIFT, SBA_RESP_MASK);
1166         c_mdata = sba_cmd_write_c_mdata(0);
1167         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1168                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1169         cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
1170                           SBA_CMD_SHIFT, SBA_CMD_MASK);
1171         cmdsp->cmd = cmd;
1172         *cmdsp->cmd_dma = cpu_to_le64(cmd);
1173         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1174         if (req->sba->hw_resp_size) {
1175                 cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
1176                 cmdsp->resp = resp_dma;
1177                 cmdsp->resp_len = req->sba->hw_resp_size;
1178         }
1179         cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
1180         cmdsp->data = *dst_p + msg_offset;
1181         cmdsp->data_len = msg_len;
1182         cmdsp++;
1183 
1184 skip_p:
1185         if (!dst_q)
1186                 goto skip_q;
1187 
1188         /* Type-A command to zero all buffers */
1189         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1190                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1191         cmd = sba_cmd_enc(cmd, msg_len,
1192                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1193         cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS,
1194                           SBA_CMD_SHIFT, SBA_CMD_MASK);
1195         cmdsp->cmd = cmd;
1196         *cmdsp->cmd_dma = cpu_to_le64(cmd);
1197         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1198         cmdsp++;
1199 
1200         if (dpos == 255)
1201                 goto skip_q_computation;
1202         pos = (dpos < req->sba->max_pq_coefs) ?
1203                 dpos : (req->sba->max_pq_coefs - 1);
1204 
1205         /*
1206          * Type-B command to generate initial Q from data
1207          * and store output into buf0
1208          */
1209         cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
1210                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1211         cmd = sba_cmd_enc(cmd, msg_len,
1212                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1213         c_mdata = sba_cmd_pq_c_mdata(pos, 0, 0);
1214         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1215                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1216         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
1217                           SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
1218         cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS,
1219                           SBA_CMD_SHIFT, SBA_CMD_MASK);
1220         cmdsp->cmd = cmd;
1221         *cmdsp->cmd_dma = cpu_to_le64(cmd);
1222         cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
1223         cmdsp->data = src + msg_offset;
1224         cmdsp->data_len = msg_len;
1225         cmdsp++;
1226 
1227         dpos -= pos;
1228 
1229         /* Multiple Type-A command to generate final Q */
1230         while (dpos) {
1231                 pos = (dpos < req->sba->max_pq_coefs) ?
1232                         dpos : (req->sba->max_pq_coefs - 1);
1233 
1234                 /*
1235                  * Type-A command to generate Q with buf0 and
1236                  * buf1 store result in buf0
1237                  */
1238                 cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1239                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1240                 cmd = sba_cmd_enc(cmd, msg_len,
1241                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1242                 c_mdata = sba_cmd_pq_c_mdata(pos, 0, 1);
1243                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1244                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1245                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
1246                                   SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
1247                 cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS,
1248                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1249                 cmdsp->cmd = cmd;
1250                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1251                 cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1252                 cmdsp++;
1253 
1254                 dpos -= pos;
1255         }
1256 
1257 skip_q_computation:
1258         if (pq_continue) {
1259                 /*
1260                  * Type-B command to XOR previous output with
1261                  * buf0 and write it into buf0
1262                  */
1263                 cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
1264                                   SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1265                 cmd = sba_cmd_enc(cmd, msg_len,
1266                                   SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1267                 c_mdata = sba_cmd_xor_c_mdata(0, 0);
1268                 cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1269                                   SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1270                 cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
1271                                   SBA_CMD_SHIFT, SBA_CMD_MASK);
1272                 cmdsp->cmd = cmd;
1273                 *cmdsp->cmd_dma = cpu_to_le64(cmd);
1274                 cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
1275                 cmdsp->data = *dst_q + msg_offset;
1276                 cmdsp->data_len = msg_len;
1277                 cmdsp++;
1278         }
1279 
1280         /* Type-A command to write buf0 */
1281         cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
1282                           SBA_TYPE_SHIFT, SBA_TYPE_MASK);
1283         cmd = sba_cmd_enc(cmd, msg_len,
1284                           SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
1285         cmd = sba_cmd_enc(cmd, 0x1,
1286                           SBA_RESP_SHIFT, SBA_RESP_MASK);
1287         c_mdata = sba_cmd_write_c_mdata(0);
1288         cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
1289                           SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
1290         cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
1291                           SBA_CMD_SHIFT, SBA_CMD_MASK);
1292         cmdsp->cmd = cmd;
1293         *cmdsp->cmd_dma = cpu_to_le64(cmd);
1294         cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
1295         if (req->sba->hw_resp_size) {
1296                 cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
1297                 cmdsp->resp = resp_dma;
1298                 cmdsp->resp_len = req->sba->hw_resp_size;
1299         }
1300         cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
1301         cmdsp->data = *dst_q + msg_offset;
1302         cmdsp->data_len = msg_len;
1303         cmdsp++;
1304 
1305 skip_q:
1306         /* Fillup brcm_message */
1307         msg->type = BRCM_MESSAGE_SBA;
1308         msg->sba.cmds = cmds;
1309         msg->sba.cmds_count = cmdsp - cmds;
1310         msg->ctx = req;
1311         msg->error = 0;
1312 }
1313 
1314 static struct sba_request *
1315 sba_prep_dma_pq_single_req(struct sba_device *sba, dma_addr_t off,
1316                            dma_addr_t *dst_p, dma_addr_t *dst_q,
1317                            dma_addr_t src, u8 scf, size_t len,
1318                            unsigned long flags)
1319 {
1320         struct sba_request *req = NULL;
1321 
1322         /* Alloc new request */
1323         req = sba_alloc_request(sba);
1324         if (!req)
1325                 return NULL;
1326         if (flags & DMA_PREP_FENCE)
1327                 req->flags |= SBA_REQUEST_FENCE;
1328 
1329         /* Fillup request messages */
1330         sba_fillup_pq_single_msg(req,  dmaf_continue(flags),
1331                                  req->cmds, &req->msg, off, len,
1332                                  dst_p, dst_q, src, scf);
1333 
1334         /* Init async_tx descriptor */
1335         req->tx.flags = flags;
1336         req->tx.cookie = -EBUSY;
1337 
1338         return req;
1339 }
1340 
1341 static struct dma_async_tx_descriptor *
1342 sba_prep_dma_pq(struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
1343                 u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
1344 {
1345         u32 i, dst_q_index;
1346         size_t req_len;
1347         bool slow = false;
1348         dma_addr_t off = 0;
1349         dma_addr_t *dst_p = NULL, *dst_q = NULL;
1350         struct sba_device *sba = to_sba_device(dchan);
1351         struct sba_request *first = NULL, *req;
1352 
1353         /* Sanity checks */
1354         if (unlikely(src_cnt > sba->max_pq_srcs))
1355                 return NULL;
1356         for (i = 0; i < src_cnt; i++)
1357                 if (sba->max_pq_coefs <= raid6_gflog[scf[i]])
1358                         slow = true;
1359 
1360         /* Figure-out P and Q destination addresses */
1361         if (!(flags & DMA_PREP_PQ_DISABLE_P))
1362                 dst_p = &dst[0];
1363         if (!(flags & DMA_PREP_PQ_DISABLE_Q))
1364                 dst_q = &dst[1];
1365 
1366         /* Create chained requests where each request is upto hw_buf_size */
1367         while (len) {
1368                 req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
1369 
1370                 if (slow) {
1371                         dst_q_index = src_cnt;
1372 
1373                         if (dst_q) {
1374                                 for (i = 0; i < src_cnt; i++) {
1375                                         if (*dst_q == src[i]) {
1376                                                 dst_q_index = i;
1377                                                 break;
1378                                         }
1379                                 }
1380                         }
1381 
1382                         if (dst_q_index < src_cnt) {
1383                                 i = dst_q_index;
1384                                 req = sba_prep_dma_pq_single_req(sba,
1385                                         off, dst_p, dst_q, src[i], scf[i],
1386                                         req_len, flags | DMA_PREP_FENCE);
1387                                 if (!req)
1388                                         goto fail;
1389 
1390                                 if (first)
1391                                         sba_chain_request(first, req);
1392                                 else
1393                                         first = req;
1394 
1395                                 flags |= DMA_PREP_CONTINUE;
1396                         }
1397 
1398                         for (i = 0; i < src_cnt; i++) {
1399                                 if (dst_q_index == i)
1400                                         continue;
1401 
1402                                 req = sba_prep_dma_pq_single_req(sba,
1403                                         off, dst_p, dst_q, src[i], scf[i],
1404                                         req_len, flags | DMA_PREP_FENCE);
1405                                 if (!req)
1406                                         goto fail;
1407 
1408                                 if (first)
1409                                         sba_chain_request(first, req);
1410                                 else
1411                                         first = req;
1412 
1413                                 flags |= DMA_PREP_CONTINUE;
1414                         }
1415                 } else {
1416                         req = sba_prep_dma_pq_req(sba, off,
1417                                                   dst_p, dst_q, src, src_cnt,
1418                                                   scf, req_len, flags);
1419                         if (!req)
1420                                 goto fail;
1421 
1422                         if (first)
1423                                 sba_chain_request(first, req);
1424                         else
1425                                 first = req;
1426                 }
1427 
1428                 off += req_len;
1429                 len -= req_len;
1430         }
1431 
1432         return (first) ? &first->tx : NULL;
1433 
1434 fail:
1435         if (first)
1436                 sba_free_chained_requests(first);
1437         return NULL;
1438 }
1439 
1440 /* ====== Mailbox callbacks ===== */
1441 
1442 static void sba_receive_message(struct mbox_client *cl, void *msg)
1443 {
1444         struct brcm_message *m = msg;
1445         struct sba_request *req = m->ctx;
1446         struct sba_device *sba = req->sba;
1447 
1448         /* Error count if message has error */
1449         if (m->error < 0)
1450                 dev_err(sba->dev, "%s got message with error %d",
1451                         dma_chan_name(&sba->dma_chan), m->error);
1452 
1453         /* Process received request */
1454         sba_process_received_request(sba, req);
1455 }
1456 
1457 /* ====== Debugfs callbacks ====== */
1458 
1459 static int sba_debugfs_stats_show(struct seq_file *file, void *offset)
1460 {
1461         struct sba_device *sba = dev_get_drvdata(file->private);
1462 
1463         /* Write stats in file */
1464         sba_write_stats_in_seqfile(sba, file);
1465 
1466         return 0;
1467 }
1468 
1469 /* ====== Platform driver routines ===== */
1470 
1471 static int sba_prealloc_channel_resources(struct sba_device *sba)
1472 {
1473         int i, j, ret = 0;
1474         struct sba_request *req = NULL;
1475 
1476         sba->resp_base = dma_alloc_coherent(sba->mbox_dev,
1477                                             sba->max_resp_pool_size,
1478                                             &sba->resp_dma_base, GFP_KERNEL);
1479         if (!sba->resp_base)
1480                 return -ENOMEM;
1481 
1482         sba->cmds_base = dma_alloc_coherent(sba->mbox_dev,
1483                                             sba->max_cmds_pool_size,
1484                                             &sba->cmds_dma_base, GFP_KERNEL);
1485         if (!sba->cmds_base) {
1486                 ret = -ENOMEM;
1487                 goto fail_free_resp_pool;
1488         }
1489 
1490         spin_lock_init(&sba->reqs_lock);
1491         sba->reqs_fence = false;
1492         INIT_LIST_HEAD(&sba->reqs_alloc_list);
1493         INIT_LIST_HEAD(&sba->reqs_pending_list);
1494         INIT_LIST_HEAD(&sba->reqs_active_list);
1495         INIT_LIST_HEAD(&sba->reqs_aborted_list);
1496         INIT_LIST_HEAD(&sba->reqs_free_list);
1497 
1498         for (i = 0; i < sba->max_req; i++) {
1499                 req = devm_kzalloc(sba->dev,
1500                                    struct_size(req, cmds, sba->max_cmd_per_req),
1501                                    GFP_KERNEL);
1502                 if (!req) {
1503                         ret = -ENOMEM;
1504                         goto fail_free_cmds_pool;
1505                 }
1506                 INIT_LIST_HEAD(&req->node);
1507                 req->sba = sba;
1508                 req->flags = SBA_REQUEST_STATE_FREE;
1509                 INIT_LIST_HEAD(&req->next);
1510                 atomic_set(&req->next_pending_count, 0);
1511                 for (j = 0; j < sba->max_cmd_per_req; j++) {
1512                         req->cmds[j].cmd = 0;
1513                         req->cmds[j].cmd_dma = sba->cmds_base +
1514                                 (i * sba->max_cmd_per_req + j) * sizeof(u64);
1515                         req->cmds[j].cmd_dma_addr = sba->cmds_dma_base +
1516                                 (i * sba->max_cmd_per_req + j) * sizeof(u64);
1517                         req->cmds[j].flags = 0;
1518                 }
1519                 memset(&req->msg, 0, sizeof(req->msg));
1520                 dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
1521                 async_tx_ack(&req->tx);
1522                 req->tx.tx_submit = sba_tx_submit;
1523                 req->tx.phys = sba->resp_dma_base + i * sba->hw_resp_size;
1524                 list_add_tail(&req->node, &sba->reqs_free_list);
1525         }
1526 
1527         return 0;
1528 
1529 fail_free_cmds_pool:
1530         dma_free_coherent(sba->mbox_dev,
1531                           sba->max_cmds_pool_size,
1532                           sba->cmds_base, sba->cmds_dma_base);
1533 fail_free_resp_pool:
1534         dma_free_coherent(sba->mbox_dev,
1535                           sba->max_resp_pool_size,
1536                           sba->resp_base, sba->resp_dma_base);
1537         return ret;
1538 }
1539 
1540 static void sba_freeup_channel_resources(struct sba_device *sba)
1541 {
1542         dmaengine_terminate_all(&sba->dma_chan);
1543         dma_free_coherent(sba->mbox_dev, sba->max_cmds_pool_size,
1544                           sba->cmds_base, sba->cmds_dma_base);
1545         dma_free_coherent(sba->mbox_dev, sba->max_resp_pool_size,
1546                           sba->resp_base, sba->resp_dma_base);
1547         sba->resp_base = NULL;
1548         sba->resp_dma_base = 0;
1549 }
1550 
1551 static int sba_async_register(struct sba_device *sba)
1552 {
1553         int ret;
1554         struct dma_device *dma_dev = &sba->dma_dev;
1555 
1556         /* Initialize DMA channel cookie */
1557         sba->dma_chan.device = dma_dev;
1558         dma_cookie_init(&sba->dma_chan);
1559 
1560         /* Initialize DMA device capability mask */
1561         dma_cap_zero(dma_dev->cap_mask);
1562         dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
1563         dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
1564         dma_cap_set(DMA_XOR, dma_dev->cap_mask);
1565         dma_cap_set(DMA_PQ, dma_dev->cap_mask);
1566 
1567         /*
1568          * Set mailbox channel device as the base device of
1569          * our dma_device because the actual memory accesses
1570          * will be done by mailbox controller
1571          */
1572         dma_dev->dev = sba->mbox_dev;
1573 
1574         /* Set base prep routines */
1575         dma_dev->device_free_chan_resources = sba_free_chan_resources;
1576         dma_dev->device_terminate_all = sba_device_terminate_all;
1577         dma_dev->device_issue_pending = sba_issue_pending;
1578         dma_dev->device_tx_status = sba_tx_status;
1579 
1580         /* Set interrupt routine */
1581         if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1582                 dma_dev->device_prep_dma_interrupt = sba_prep_dma_interrupt;
1583 
1584         /* Set memcpy routine */
1585         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1586                 dma_dev->device_prep_dma_memcpy = sba_prep_dma_memcpy;
1587 
1588         /* Set xor routine and capability */
1589         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1590                 dma_dev->device_prep_dma_xor = sba_prep_dma_xor;
1591                 dma_dev->max_xor = sba->max_xor_srcs;
1592         }
1593 
1594         /* Set pq routine and capability */
1595         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1596                 dma_dev->device_prep_dma_pq = sba_prep_dma_pq;
1597                 dma_set_maxpq(dma_dev, sba->max_pq_srcs, 0);
1598         }
1599 
1600         /* Initialize DMA device channel list */
1601         INIT_LIST_HEAD(&dma_dev->channels);
1602         list_add_tail(&sba->dma_chan.device_node, &dma_dev->channels);
1603 
1604         /* Register with Linux async DMA framework*/
1605         ret = dma_async_device_register(dma_dev);
1606         if (ret) {
1607                 dev_err(sba->dev, "async device register error %d", ret);
1608                 return ret;
1609         }
1610 
1611         dev_info(sba->dev, "%s capabilities: %s%s%s%s\n",
1612         dma_chan_name(&sba->dma_chan),
1613         dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "interrupt " : "",
1614         dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "memcpy " : "",
1615         dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1616         dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "");
1617 
1618         return 0;
1619 }
1620 
1621 static int sba_probe(struct platform_device *pdev)
1622 {
1623         int ret = 0;
1624         struct sba_device *sba;
1625         struct platform_device *mbox_pdev;
1626         struct of_phandle_args args;
1627 
1628         /* Allocate main SBA struct */
1629         sba = devm_kzalloc(&pdev->dev, sizeof(*sba), GFP_KERNEL);
1630         if (!sba)
1631                 return -ENOMEM;
1632 
1633         sba->dev = &pdev->dev;
1634         platform_set_drvdata(pdev, sba);
1635 
1636         /* Number of mailbox channels should be atleast 1 */
1637         ret = of_count_phandle_with_args(pdev->dev.of_node,
1638                                          "mboxes", "#mbox-cells");
1639         if (ret <= 0)
1640                 return -ENODEV;
1641 
1642         /* Determine SBA version from DT compatible string */
1643         if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba"))
1644                 sba->ver = SBA_VER_1;
1645         else if (of_device_is_compatible(sba->dev->of_node,
1646                                          "brcm,iproc-sba-v2"))
1647                 sba->ver = SBA_VER_2;
1648         else
1649                 return -ENODEV;
1650 
1651         /* Derived Configuration parameters */
1652         switch (sba->ver) {
1653         case SBA_VER_1:
1654                 sba->hw_buf_size = 4096;
1655                 sba->hw_resp_size = 8;
1656                 sba->max_pq_coefs = 6;
1657                 sba->max_pq_srcs = 6;
1658                 break;
1659         case SBA_VER_2:
1660                 sba->hw_buf_size = 4096;
1661                 sba->hw_resp_size = 8;
1662                 sba->max_pq_coefs = 30;
1663                 /*
1664                  * We can support max_pq_srcs == max_pq_coefs because
1665                  * we are limited by number of SBA commands that we can
1666                  * fit in one message for underlying ring manager HW.
1667                  */
1668                 sba->max_pq_srcs = 12;
1669                 break;
1670         default:
1671                 return -EINVAL;
1672         }
1673         sba->max_req = SBA_MAX_REQ_PER_MBOX_CHANNEL;
1674         sba->max_cmd_per_req = sba->max_pq_srcs + 3;
1675         sba->max_xor_srcs = sba->max_cmd_per_req - 1;
1676         sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size;
1677         sba->max_cmds_pool_size = sba->max_req *
1678                                   sba->max_cmd_per_req * sizeof(u64);
1679 
1680         /* Setup mailbox client */
1681         sba->client.dev                 = &pdev->dev;
1682         sba->client.rx_callback         = sba_receive_message;
1683         sba->client.tx_block            = false;
1684         sba->client.knows_txdone        = true;
1685         sba->client.tx_tout             = 0;
1686 
1687         /* Request mailbox channel */
1688         sba->mchan = mbox_request_channel(&sba->client, 0);
1689         if (IS_ERR(sba->mchan)) {
1690                 ret = PTR_ERR(sba->mchan);
1691                 goto fail_free_mchan;
1692         }
1693 
1694         /* Find-out underlying mailbox device */
1695         ret = of_parse_phandle_with_args(pdev->dev.of_node,
1696                                          "mboxes", "#mbox-cells", 0, &args);
1697         if (ret)
1698                 goto fail_free_mchan;
1699         mbox_pdev = of_find_device_by_node(args.np);
1700         of_node_put(args.np);
1701         if (!mbox_pdev) {
1702                 ret = -ENODEV;
1703                 goto fail_free_mchan;
1704         }
1705         sba->mbox_dev = &mbox_pdev->dev;
1706 
1707         /* Prealloc channel resource */
1708         ret = sba_prealloc_channel_resources(sba);
1709         if (ret)
1710                 goto fail_free_mchan;
1711 
1712         /* Check availability of debugfs */
1713         if (!debugfs_initialized())
1714                 goto skip_debugfs;
1715 
1716         /* Create debugfs root entry */
1717         sba->root = debugfs_create_dir(dev_name(sba->dev), NULL);
1718 
1719         /* Create debugfs stats entry */
1720         debugfs_create_devm_seqfile(sba->dev, "stats", sba->root,
1721                                     sba_debugfs_stats_show);
1722 
1723 skip_debugfs:
1724 
1725         /* Register DMA device with Linux async framework */
1726         ret = sba_async_register(sba);
1727         if (ret)
1728                 goto fail_free_resources;
1729 
1730         /* Print device info */
1731         dev_info(sba->dev, "%s using SBAv%d mailbox channel from %s",
1732                  dma_chan_name(&sba->dma_chan), sba->ver+1,
1733                  dev_name(sba->mbox_dev));
1734 
1735         return 0;
1736 
1737 fail_free_resources:
1738         debugfs_remove_recursive(sba->root);
1739         sba_freeup_channel_resources(sba);
1740 fail_free_mchan:
1741         mbox_free_channel(sba->mchan);
1742         return ret;
1743 }
1744 
1745 static int sba_remove(struct platform_device *pdev)
1746 {
1747         struct sba_device *sba = platform_get_drvdata(pdev);
1748 
1749         dma_async_device_unregister(&sba->dma_dev);
1750 
1751         debugfs_remove_recursive(sba->root);
1752 
1753         sba_freeup_channel_resources(sba);
1754 
1755         mbox_free_channel(sba->mchan);
1756 
1757         return 0;
1758 }
1759 
1760 static const struct of_device_id sba_of_match[] = {
1761         { .compatible = "brcm,iproc-sba", },
1762         { .compatible = "brcm,iproc-sba-v2", },
1763         {},
1764 };
1765 MODULE_DEVICE_TABLE(of, sba_of_match);
1766 
1767 static struct platform_driver sba_driver = {
1768         .probe = sba_probe,
1769         .remove = sba_remove,
1770         .driver = {
1771                 .name = "bcm-sba-raid",
1772                 .of_match_table = sba_of_match,
1773         },
1774 };
1775 module_platform_driver(sba_driver);
1776 
1777 MODULE_DESCRIPTION("Broadcom SBA RAID driver");
1778 MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>");
1779 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/dma/bcm-sba-raid.c

DEFINITIONS
