drivers/net/fsl-mc/dpio/qbman_portal.c

   1 /*
   2  * Copyright (C) 2014 Freescale Semiconductor
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include "qbman_portal.h"
   8
   9 /* QBMan portal management command codes */
  10 #define QBMAN_MC_ACQUIRE       0x30
  11 #define QBMAN_WQCHAN_CONFIGURE 0x46
  12
  13 /* CINH register offsets */
  14 #define QBMAN_CINH_SWP_EQAR    0x8c0
  15 #define QBMAN_CINH_SWP_DCAP    0xac0
  16 #define QBMAN_CINH_SWP_SDQCR   0xb00
  17 #define QBMAN_CINH_SWP_RAR     0xcc0
  18
  19 /* CENA register offsets */
  20 #define QBMAN_CENA_SWP_EQCR(n) (0x000 + ((uint32_t)(n) << 6))
  21 #define QBMAN_CENA_SWP_DQRR(n) (0x200 + ((uint32_t)(n) << 6))
  22 #define QBMAN_CENA_SWP_RCR(n)  (0x400 + ((uint32_t)(n) << 6))
  23 #define QBMAN_CENA_SWP_CR      0x600
  24 #define QBMAN_CENA_SWP_RR(vb)  (0x700 + ((uint32_t)(vb) >> 1))
  25 #define QBMAN_CENA_SWP_VDQCR   0x780
  26
  27 /* Reverse mapping of QBMAN_CENA_SWP_DQRR() */
  28 #define QBMAN_IDX_FROM_DQRR(p) (((unsigned long)p & 0x1ff) >> 6)
  29
  30 /*******************************/
  31 /* Pre-defined attribute codes */
  32 /*******************************/
  33
  34 struct qb_attr_code code_generic_verb = QB_CODE(0, 0, 7);
  35 struct qb_attr_code code_generic_rslt = QB_CODE(0, 8, 8);
  36
  37 /*************************/
  38 /* SDQCR attribute codes */
  39 /*************************/
  40
  41 /* we put these here because at least some of them are required by
  42  * qbman_swp_init() */
  43 struct qb_attr_code code_sdqcr_dct = QB_CODE(0, 24, 2);
  44 struct qb_attr_code code_sdqcr_fc = QB_CODE(0, 29, 1);
  45 struct qb_attr_code code_sdqcr_tok = QB_CODE(0, 16, 8);
  46 #define CODE_SDQCR_DQSRC(n) QB_CODE(0, n, 1)
  47 enum qbman_sdqcr_dct {
  48         qbman_sdqcr_dct_null = 0,
  49         qbman_sdqcr_dct_prio_ics,
  50         qbman_sdqcr_dct_active_ics,
  51         qbman_sdqcr_dct_active
  52 };
  53 enum qbman_sdqcr_fc {
  54         qbman_sdqcr_fc_one = 0,
  55         qbman_sdqcr_fc_up_to_3 = 1
  56 };
  57
  58 /*********************************/
  59 /* Portal constructor/destructor */
  60 /*********************************/
  61
  62 /* Software portals should always be in the power-on state when we initialise,
  63  * due to the CCSR-based portal reset functionality that MC has. */
  64 struct qbman_swp *qbman_swp_init(const struct qbman_swp_desc *d)
  65 {
  66         int ret;
  67         struct qbman_swp *p = malloc(sizeof(struct qbman_swp));
  68         u32 major = 0, minor = 0;
  69
  70         if (!p)
  71                 return NULL;
  72         p->desc = d;
  73 #ifdef QBMAN_CHECKING
  74         p->mc.check = swp_mc_can_start;
  75 #endif
  76         p->mc.valid_bit = QB_VALID_BIT;
  77         p->sdq = 0;
  78         qb_attr_code_encode(&code_sdqcr_dct, &p->sdq, qbman_sdqcr_dct_prio_ics);
  79         qb_attr_code_encode(&code_sdqcr_fc, &p->sdq, qbman_sdqcr_fc_up_to_3);
  80         qb_attr_code_encode(&code_sdqcr_tok, &p->sdq, 0xbb);
  81         atomic_set(&p->vdq.busy, 1);
  82         p->vdq.valid_bit = QB_VALID_BIT;
  83         p->dqrr.next_idx = 0;
  84
  85         qbman_version(&major, &minor);
  86         if (!major) {
  87                 printf("invalid qbman version\n");
  88                 return NULL;
  89         }
  90
  91         if (major >= 4 && minor >= 1)
  92                 p->dqrr.dqrr_size = QBMAN_VER_4_1_DQRR_SIZE;
  93         else
  94                 p->dqrr.dqrr_size = QBMAN_VER_4_0_DQRR_SIZE;
  95
  96         p->dqrr.valid_bit = QB_VALID_BIT;
  97         ret = qbman_swp_sys_init(&p->sys, d, p->dqrr.dqrr_size);
  98         if (ret) {
  99                 free(p);
 100                 printf("qbman_swp_sys_init() failed %d\n", ret);
 101                 return NULL;
 102         }
 103         qbman_cinh_write(&p->sys, QBMAN_CINH_SWP_SDQCR, p->sdq);
 104         return p;
 105 }
 106
 107 /***********************/
 108 /* Management commands */
 109 /***********************/
 110
 111 /*
 112  * Internal code common to all types of management commands.
 113  */
 114
 115 void *qbman_swp_mc_start(struct qbman_swp *p)
 116 {
 117         void *ret;
 118         int *return_val;
 119 #ifdef QBMAN_CHECKING
 120         BUG_ON(p->mc.check != swp_mc_can_start);
 121 #endif
 122         ret = qbman_cena_write_start(&p->sys, QBMAN_CENA_SWP_CR);
 123 #ifdef QBMAN_CHECKING
 124         return_val = (int *)ret;
 125         if (!(*return_val))
 126                 p->mc.check = swp_mc_can_submit;
 127 #endif
 128         return ret;
 129 }
 130
 131 void qbman_swp_mc_submit(struct qbman_swp *p, void *cmd, uint32_t cmd_verb)
 132 {
 133         uint32_t *v = cmd;
 134 #ifdef QBMAN_CHECKING
 135         BUG_ON(p->mc.check != swp_mc_can_submit);
 136 #endif
 137         lwsync();
 138         /* TBD: "|=" is going to hurt performance. Need to move as many fields
 139          * out of word zero, and for those that remain, the "OR" needs to occur
 140          * at the caller side. This debug check helps to catch cases where the
 141          * caller wants to OR but has forgotten to do so. */
 142         BUG_ON((*v & cmd_verb) != *v);
 143         *v = cmd_verb | p->mc.valid_bit;
 144         qbman_cena_write_complete(&p->sys, QBMAN_CENA_SWP_CR, cmd);
 145         /* TODO: add prefetch support for GPP */
 146 #ifdef QBMAN_CHECKING
 147         p->mc.check = swp_mc_can_poll;
 148 #endif
 149 }
 150
 151 void *qbman_swp_mc_result(struct qbman_swp *p)
 152 {
 153         uint32_t *ret, verb;
 154 #ifdef QBMAN_CHECKING
 155         BUG_ON(p->mc.check != swp_mc_can_poll);
 156 #endif
 157         ret = qbman_cena_read(&p->sys, QBMAN_CENA_SWP_RR(p->mc.valid_bit));
 158         /* Remove the valid-bit - command completed iff the rest is non-zero */
 159         verb = ret[0] & ~QB_VALID_BIT;
 160         if (!verb)
 161                 return NULL;
 162 #ifdef QBMAN_CHECKING
 163         p->mc.check = swp_mc_can_start;
 164 #endif
 165         p->mc.valid_bit ^= QB_VALID_BIT;
 166         return ret;
 167 }
 168
 169 /***********/
 170 /* Enqueue */
 171 /***********/
 172
 173 /* These should be const, eventually */
 174 static struct qb_attr_code code_eq_cmd = QB_CODE(0, 0, 2);
 175 static struct qb_attr_code code_eq_orp_en = QB_CODE(0, 2, 1);
 176 static struct qb_attr_code code_eq_tgt_id = QB_CODE(2, 0, 24);
 177 /* static struct qb_attr_code code_eq_tag = QB_CODE(3, 0, 32); */
 178 static struct qb_attr_code code_eq_qd_en = QB_CODE(0, 4, 1);
 179 static struct qb_attr_code code_eq_qd_bin = QB_CODE(4, 0, 16);
 180 static struct qb_attr_code code_eq_qd_pri = QB_CODE(4, 16, 4);
 181 static struct qb_attr_code code_eq_rsp_stash = QB_CODE(5, 16, 1);
 182 static struct qb_attr_code code_eq_rsp_lo = QB_CODE(6, 0, 32);
 183
 184 enum qbman_eq_cmd_e {
 185         /* No enqueue, primarily for plugging ORP gaps for dropped frames */
 186         qbman_eq_cmd_empty,
 187         /* DMA an enqueue response once complete */
 188         qbman_eq_cmd_respond,
 189         /* DMA an enqueue response only if the enqueue fails */
 190         qbman_eq_cmd_respond_reject
 191 };
 192
 193 void qbman_eq_desc_clear(struct qbman_eq_desc *d)
 194 {
 195         memset(d, 0, sizeof(*d));
 196 }
 197
 198 void qbman_eq_desc_set_no_orp(struct qbman_eq_desc *d, int respond_success)
 199 {
 200         uint32_t *cl = qb_cl(d);
 201
 202         qb_attr_code_encode(&code_eq_orp_en, cl, 0);
 203         qb_attr_code_encode(&code_eq_cmd, cl,
 204                             respond_success ? qbman_eq_cmd_respond :
 205                                               qbman_eq_cmd_respond_reject);
 206 }
 207
 208 void qbman_eq_desc_set_response(struct qbman_eq_desc *d,
 209                                 dma_addr_t storage_phys,
 210                                 int stash)
 211 {
 212         uint32_t *cl = qb_cl(d);
 213
 214         qb_attr_code_encode_64(&code_eq_rsp_lo, (uint64_t *)cl, storage_phys);
 215         qb_attr_code_encode(&code_eq_rsp_stash, cl, !!stash);
 216 }
 217
 218
 219 void qbman_eq_desc_set_qd(struct qbman_eq_desc *d, uint32_t qdid,
 220                           uint32_t qd_bin, uint32_t qd_prio)
 221 {
 222         uint32_t *cl = qb_cl(d);
 223
 224         qb_attr_code_encode(&code_eq_qd_en, cl, 1);
 225         qb_attr_code_encode(&code_eq_tgt_id, cl, qdid);
 226         qb_attr_code_encode(&code_eq_qd_bin, cl, qd_bin);
 227         qb_attr_code_encode(&code_eq_qd_pri, cl, qd_prio);
 228 }
 229
 230 #define EQAR_IDX(eqar)     ((eqar) & 0x7)
 231 #define EQAR_VB(eqar)      ((eqar) & 0x80)
 232 #define EQAR_SUCCESS(eqar) ((eqar) & 0x100)
 233
 234 int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
 235                       const struct qbman_fd *fd)
 236 {
 237         uint32_t *p;
 238         const uint32_t *cl = qb_cl(d);
 239         uint32_t eqar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_EQAR);
 240         debug("EQAR=%08x\n", eqar);
 241         if (!EQAR_SUCCESS(eqar))
 242                 return -EBUSY;
 243         p = qbman_cena_write_start(&s->sys,
 244                                    QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)));
 245         word_copy(&p[1], &cl[1], 7);
 246         word_copy(&p[8], fd, sizeof(*fd) >> 2);
 247         lwsync();
 248         /* Set the verb byte, have to substitute in the valid-bit */
 249         p[0] = cl[0] | EQAR_VB(eqar);
 250         qbman_cena_write_complete(&s->sys,
 251                                   QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)),
 252                                   p);
 253         return 0;
 254 }
 255
 256 /***************************/
 257 /* Volatile (pull) dequeue */
 258 /***************************/
 259
 260 /* These should be const, eventually */
 261 static struct qb_attr_code code_pull_dct = QB_CODE(0, 0, 2);
 262 static struct qb_attr_code code_pull_dt = QB_CODE(0, 2, 2);
 263 static struct qb_attr_code code_pull_rls = QB_CODE(0, 4, 1);
 264 static struct qb_attr_code code_pull_stash = QB_CODE(0, 5, 1);
 265 static struct qb_attr_code code_pull_numframes = QB_CODE(0, 8, 4);
 266 static struct qb_attr_code code_pull_token = QB_CODE(0, 16, 8);
 267 static struct qb_attr_code code_pull_dqsource = QB_CODE(1, 0, 24);
 268 static struct qb_attr_code code_pull_rsp_lo = QB_CODE(2, 0, 32);
 269
 270 enum qb_pull_dt_e {
 271         qb_pull_dt_channel,
 272         qb_pull_dt_workqueue,
 273         qb_pull_dt_framequeue
 274 };
 275
 276 void qbman_pull_desc_clear(struct qbman_pull_desc *d)
 277 {
 278         memset(d, 0, sizeof(*d));
 279 }
 280
 281 void qbman_pull_desc_set_storage(struct qbman_pull_desc *d,
 282                                  struct ldpaa_dq *storage,
 283                                  dma_addr_t storage_phys,
 284                                  int stash)
 285 {
 286         uint32_t *cl = qb_cl(d);
 287
 288         /* Squiggle the pointer 'storage' into the extra 2 words of the
 289          * descriptor (which aren't copied to the hw command) */
 290         *(void **)&cl[4] = storage;
 291         if (!storage) {
 292                 qb_attr_code_encode(&code_pull_rls, cl, 0);
 293                 return;
 294         }
 295         qb_attr_code_encode(&code_pull_rls, cl, 1);
 296         qb_attr_code_encode(&code_pull_stash, cl, !!stash);
 297         qb_attr_code_encode_64(&code_pull_rsp_lo, (uint64_t *)cl, storage_phys);
 298 }
 299
 300 void qbman_pull_desc_set_numframes(struct qbman_pull_desc *d, uint8_t numframes)
 301 {
 302         uint32_t *cl = qb_cl(d);
 303
 304         BUG_ON(!numframes || (numframes > 16));
 305         qb_attr_code_encode(&code_pull_numframes, cl,
 306                             (uint32_t)(numframes - 1));
 307 }
 308
 309 void qbman_pull_desc_set_token(struct qbman_pull_desc *d, uint8_t token)
 310 {
 311         uint32_t *cl = qb_cl(d);
 312
 313         qb_attr_code_encode(&code_pull_token, cl, token);
 314 }
 315
 316 void qbman_pull_desc_set_fq(struct qbman_pull_desc *d, uint32_t fqid)
 317 {
 318         uint32_t *cl = qb_cl(d);
 319
 320         qb_attr_code_encode(&code_pull_dct, cl, 1);
 321         qb_attr_code_encode(&code_pull_dt, cl, qb_pull_dt_framequeue);
 322         qb_attr_code_encode(&code_pull_dqsource, cl, fqid);
 323 }
 324
 325 int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 326 {
 327         uint32_t *p;
 328         uint32_t *cl = qb_cl(d);
 329
 330         if (!atomic_dec_and_test(&s->vdq.busy)) {
 331                 atomic_inc(&s->vdq.busy);
 332                 return -EBUSY;
 333         }
 334         s->vdq.storage = *(void **)&cl[4];
 335         s->vdq.token = qb_attr_code_decode(&code_pull_token, cl);
 336         p = qbman_cena_write_start(&s->sys, QBMAN_CENA_SWP_VDQCR);
 337         word_copy(&p[1], &cl[1], 3);
 338         lwsync();
 339         /* Set the verb byte, have to substitute in the valid-bit */
 340         p[0] = cl[0] | s->vdq.valid_bit;
 341         s->vdq.valid_bit ^= QB_VALID_BIT;
 342         qbman_cena_write_complete(&s->sys, QBMAN_CENA_SWP_VDQCR, p);
 343         return 0;
 344 }
 345
 346 /****************/
 347 /* Polling DQRR */
 348 /****************/
 349
 350 static struct qb_attr_code code_dqrr_verb = QB_CODE(0, 0, 8);
 351 static struct qb_attr_code code_dqrr_response = QB_CODE(0, 0, 7);
 352 static struct qb_attr_code code_dqrr_stat = QB_CODE(0, 8, 8);
 353
 354 #define QBMAN_DQRR_RESPONSE_DQ        0x60
 355 #define QBMAN_DQRR_RESPONSE_FQRN      0x21
 356 #define QBMAN_DQRR_RESPONSE_FQRNI     0x22
 357 #define QBMAN_DQRR_RESPONSE_FQPN      0x24
 358 #define QBMAN_DQRR_RESPONSE_FQDAN     0x25
 359 #define QBMAN_DQRR_RESPONSE_CDAN      0x26
 360 #define QBMAN_DQRR_RESPONSE_CSCN_MEM  0x27
 361 #define QBMAN_DQRR_RESPONSE_CGCU      0x28
 362 #define QBMAN_DQRR_RESPONSE_BPSCN     0x29
 363 #define QBMAN_DQRR_RESPONSE_CSCN_WQ   0x2a
 364
 365
 366 /* NULL return if there are no unconsumed DQRR entries. Returns a DQRR entry
 367  * only once, so repeated calls can return a sequence of DQRR entries, without
 368  * requiring they be consumed immediately or in any particular order. */
 369 const struct ldpaa_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
 370 {
 371         uint32_t verb;
 372         uint32_t response_verb;
 373         uint32_t flags;
 374         const struct ldpaa_dq *dq;
 375         const uint32_t *p;
 376
 377         dq = qbman_cena_read(&s->sys, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 378         p = qb_cl(dq);
 379         verb = qb_attr_code_decode(&code_dqrr_verb, p);
 380
 381         /* If the valid-bit isn't of the expected polarity, nothing there. Note,
 382          * in the DQRR reset bug workaround, we shouldn't need to skip these
 383          * check, because we've already determined that a new entry is available
 384          * and we've invalidated the cacheline before reading it, so the
 385          * valid-bit behaviour is repaired and should tell us what we already
 386          * knew from reading PI.
 387          */
 388         if ((verb & QB_VALID_BIT) != s->dqrr.valid_bit) {
 389                 qbman_cena_invalidate_prefetch(&s->sys,
 390                                         QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 391                 return NULL;
 392         }
 393         /* There's something there. Move "next_idx" attention to the next ring
 394          * entry (and prefetch it) before returning what we found. */
 395         s->dqrr.next_idx++;
 396         s->dqrr.next_idx &= s->dqrr.dqrr_size - 1;/* Wrap around at dqrr_size */
 397         /* TODO: it's possible to do all this without conditionals, optimise it
 398          * later. */
 399         if (!s->dqrr.next_idx)
 400                 s->dqrr.valid_bit ^= QB_VALID_BIT;
 401
 402         /* If this is the final response to a volatile dequeue command
 403            indicate that the vdq is no longer busy */
 404         flags = ldpaa_dq_flags(dq);
 405         response_verb = qb_attr_code_decode(&code_dqrr_response, &verb);
 406         if ((response_verb == QBMAN_DQRR_RESPONSE_DQ) &&
 407             (flags & LDPAA_DQ_STAT_VOLATILE) &&
 408             (flags & LDPAA_DQ_STAT_EXPIRED))
 409                         atomic_inc(&s->vdq.busy);
 410
 411         qbman_cena_invalidate_prefetch(&s->sys,
 412                                        QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 413         return dq;
 414 }
 415
 416 /* Consume DQRR entries previously returned from qbman_swp_dqrr_next(). */
 417 void qbman_swp_dqrr_consume(struct qbman_swp *s, const struct ldpaa_dq *dq)
 418 {
 419         qbman_cinh_write(&s->sys, QBMAN_CINH_SWP_DCAP, QBMAN_IDX_FROM_DQRR(dq));
 420 }
 421
 422 /*********************************/
 423 /* Polling user-provided storage */
 424 /*********************************/
 425
 426 void qbman_dq_entry_set_oldtoken(struct ldpaa_dq *dq,
 427                                  unsigned int num_entries,
 428                                  uint8_t oldtoken)
 429 {
 430         memset(dq, oldtoken, num_entries * sizeof(*dq));
 431 }
 432
 433 int qbman_dq_entry_has_newtoken(struct qbman_swp *s,
 434                                 const struct ldpaa_dq *dq,
 435                                 uint8_t newtoken)
 436 {
 437         /* To avoid converting the little-endian DQ entry to host-endian prior
 438          * to us knowing whether there is a valid entry or not (and run the
 439          * risk of corrupting the incoming hardware LE write), we detect in
 440          * hardware endianness rather than host. This means we need a different
 441          * "code" depending on whether we are BE or LE in software, which is
 442          * where DQRR_TOK_OFFSET comes in... */
 443         static struct qb_attr_code code_dqrr_tok_detect =
 444                                         QB_CODE(0, DQRR_TOK_OFFSET, 8);
 445         /* The user trying to poll for a result treats "dq" as const. It is
 446          * however the same address that was provided to us non-const in the
 447          * first place, for directing hardware DMA to. So we can cast away the
 448          * const because it is mutable from our perspective. */
 449         uint32_t *p = qb_cl((struct ldpaa_dq *)dq);
 450         uint32_t token;
 451
 452         token = qb_attr_code_decode(&code_dqrr_tok_detect, &p[1]);
 453         if (token != newtoken)
 454                 return 0;
 455
 456         /* Only now do we convert from hardware to host endianness. Also, as we
 457          * are returning success, the user has promised not to call us again, so
 458          * there's no risk of us converting the endianness twice... */
 459         make_le32_n(p, 16);
 460
 461         /* VDQCR "no longer busy" hook - not quite the same as DQRR, because the
 462          * fact "VDQCR" shows busy doesn't mean that the result we're looking at
 463          * is from the same command. Eg. we may be looking at our 10th dequeue
 464          * result from our first VDQCR command, yet the second dequeue command
 465          * could have been kicked off already, after seeing the 1st result. Ie.
 466          * the result we're looking at is not necessarily proof that we can
 467          * reset "busy".  We instead base the decision on whether the current
 468          * result is sitting at the first 'storage' location of the busy
 469          * command. */
 470         if (s->vdq.storage == dq) {
 471                 s->vdq.storage = NULL;
 472                         atomic_inc(&s->vdq.busy);
 473         }
 474         return 1;
 475 }
 476
 477 /********************************/
 478 /* Categorising dequeue entries */
 479 /********************************/
 480
 481 static inline int __qbman_dq_entry_is_x(const struct ldpaa_dq *dq, uint32_t x)
 482 {
 483         const uint32_t *p = qb_cl(dq);
 484         uint32_t response_verb = qb_attr_code_decode(&code_dqrr_response, p);
 485
 486         return response_verb == x;
 487 }
 488
 489 int qbman_dq_entry_is_DQ(const struct ldpaa_dq *dq)
 490 {
 491         return __qbman_dq_entry_is_x(dq, QBMAN_DQRR_RESPONSE_DQ);
 492 }
 493
 494 /*********************************/
 495 /* Parsing frame dequeue results */
 496 /*********************************/
 497
 498 /* These APIs assume qbman_dq_entry_is_DQ() is TRUE */
 499
 500 uint32_t ldpaa_dq_flags(const struct ldpaa_dq *dq)
 501 {
 502         const uint32_t *p = qb_cl(dq);
 503
 504         return qb_attr_code_decode(&code_dqrr_stat, p);
 505 }
 506
 507 const struct dpaa_fd *ldpaa_dq_fd(const struct ldpaa_dq *dq)
 508 {
 509         const uint32_t *p = qb_cl(dq);
 510
 511         return (const struct dpaa_fd *)&p[8];
 512 }
 513
 514 /******************/
 515 /* Buffer release */
 516 /******************/
 517
 518 /* These should be const, eventually */
 519 /* static struct qb_attr_code code_release_num = QB_CODE(0, 0, 3); */
 520 static struct qb_attr_code code_release_set_me = QB_CODE(0, 5, 1);
 521 static struct qb_attr_code code_release_bpid = QB_CODE(0, 16, 16);
 522
 523 void qbman_release_desc_clear(struct qbman_release_desc *d)
 524 {
 525         uint32_t *cl;
 526
 527         memset(d, 0, sizeof(*d));
 528         cl = qb_cl(d);
 529         qb_attr_code_encode(&code_release_set_me, cl, 1);
 530 }
 531
 532 void qbman_release_desc_set_bpid(struct qbman_release_desc *d, uint32_t bpid)
 533 {
 534         uint32_t *cl = qb_cl(d);
 535
 536         qb_attr_code_encode(&code_release_bpid, cl, bpid);
 537 }
 538
 539 #define RAR_IDX(rar)     ((rar) & 0x7)
 540 #define RAR_VB(rar)      ((rar) & 0x80)
 541 #define RAR_SUCCESS(rar) ((rar) & 0x100)
 542
 543 int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
 544                       const uint64_t *buffers, unsigned int num_buffers)
 545 {
 546         uint32_t *p;
 547         const uint32_t *cl = qb_cl(d);
 548         uint32_t rar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_RAR);
 549         debug("RAR=%08x\n", rar);
 550         if (!RAR_SUCCESS(rar))
 551                 return -EBUSY;
 552         BUG_ON(!num_buffers || (num_buffers > 7));
 553         /* Start the release command */
 554         p = qbman_cena_write_start(&s->sys,
 555                                    QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
 556         /* Copy the caller's buffer pointers to the command */
 557         u64_to_le32_copy(&p[2], buffers, num_buffers);
 558         lwsync();
 559         /* Set the verb byte, have to substitute in the valid-bit and the number
 560          * of buffers. */
 561         p[0] = cl[0] | RAR_VB(rar) | num_buffers;
 562         qbman_cena_write_complete(&s->sys,
 563                                   QBMAN_CENA_SWP_RCR(RAR_IDX(rar)),
 564                                   p);
 565         return 0;
 566 }
 567
 568 /*******************/
 569 /* Buffer acquires */
 570 /*******************/
 571
 572 /* These should be const, eventually */
 573 static struct qb_attr_code code_acquire_bpid = QB_CODE(0, 16, 16);
 574 static struct qb_attr_code code_acquire_num = QB_CODE(1, 0, 3);
 575 static struct qb_attr_code code_acquire_r_num = QB_CODE(1, 0, 3);
 576
 577 int qbman_swp_acquire(struct qbman_swp *s, uint32_t bpid, uint64_t *buffers,
 578                       unsigned int num_buffers)
 579 {
 580         uint32_t *p;
 581         uint32_t verb, rslt, num;
 582
 583         BUG_ON(!num_buffers || (num_buffers > 7));
 584
 585         /* Start the management command */
 586         p = qbman_swp_mc_start(s);
 587
 588         if (!p)
 589                 return -EBUSY;
 590
 591         /* Encode the caller-provided attributes */
 592         qb_attr_code_encode(&code_acquire_bpid, p, bpid);
 593         qb_attr_code_encode(&code_acquire_num, p, num_buffers);
 594
 595         /* Complete the management command */
 596         p = qbman_swp_mc_complete(s, p, p[0] | QBMAN_MC_ACQUIRE);
 597
 598         /* Decode the outcome */
 599         verb = qb_attr_code_decode(&code_generic_verb, p);
 600         rslt = qb_attr_code_decode(&code_generic_rslt, p);
 601         num = qb_attr_code_decode(&code_acquire_r_num, p);
 602         BUG_ON(verb != QBMAN_MC_ACQUIRE);
 603
 604         /* Determine success or failure */
 605         if (unlikely(rslt != QBMAN_MC_RSLT_OK)) {
 606                 printf("Acquire buffers from BPID 0x%x failed, code=0x%02x\n",
 607                        bpid, rslt);
 608                 return -EIO;
 609         }
 610         BUG_ON(num > num_buffers);
 611         /* Copy the acquired buffers to the caller's array */
 612         u64_from_le32_copy(buffers, &p[2], num);
 613         return (int)num;
 614 }