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