git.sur5r.net Git - u-boot/blob - 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 <asm/arch/clock.h>
   8 #include "qbman_portal.h"
   9
  10 /* QBMan portal management command codes */
  11 #define QBMAN_MC_ACQUIRE       0x30
  12 #define QBMAN_WQCHAN_CONFIGURE 0x46
  13
  14 /* CINH register offsets */
  15 #define QBMAN_CINH_SWP_EQAR    0x8c0
  16 #define QBMAN_CINH_SWP_DCAP    0xac0
  17 #define QBMAN_CINH_SWP_SDQCR   0xb00
  18 #define QBMAN_CINH_SWP_RAR     0xcc0
  19
  20 /* CENA register offsets */
  21 #define QBMAN_CENA_SWP_EQCR(n) (0x000 + ((uint32_t)(n) << 6))
  22 #define QBMAN_CENA_SWP_DQRR(n) (0x200 + ((uint32_t)(n) << 6))
  23 #define QBMAN_CENA_SWP_RCR(n)  (0x400 + ((uint32_t)(n) << 6))
  24 #define QBMAN_CENA_SWP_CR      0x600
  25 #define QBMAN_CENA_SWP_RR(vb)  (0x700 + ((uint32_t)(vb) >> 1))
  26 #define QBMAN_CENA_SWP_VDQCR   0x780
  27
  28 /* Reverse mapping of QBMAN_CENA_SWP_DQRR() */
  29 #define QBMAN_IDX_FROM_DQRR(p) (((unsigned long)p & 0x1ff) >> 6)
  30
  31 /*******************************/
  32 /* Pre-defined attribute codes */
  33 /*******************************/
  34
  35 struct qb_attr_code code_generic_verb = QB_CODE(0, 0, 7);
  36 struct qb_attr_code code_generic_rslt = QB_CODE(0, 8, 8);
  37
  38 /*************************/
  39 /* SDQCR attribute codes */
  40 /*************************/
  41
  42 /* we put these here because at least some of them are required by
  43  * qbman_swp_init() */
  44 struct qb_attr_code code_sdqcr_dct = QB_CODE(0, 24, 2);
  45 struct qb_attr_code code_sdqcr_fc = QB_CODE(0, 29, 1);
  46 struct qb_attr_code code_sdqcr_tok = QB_CODE(0, 16, 8);
  47 #define CODE_SDQCR_DQSRC(n) QB_CODE(0, n, 1)
  48 enum qbman_sdqcr_dct {
  49         qbman_sdqcr_dct_null = 0,
  50         qbman_sdqcr_dct_prio_ics,
  51         qbman_sdqcr_dct_active_ics,
  52         qbman_sdqcr_dct_active
  53 };
  54 enum qbman_sdqcr_fc {
  55         qbman_sdqcr_fc_one = 0,
  56         qbman_sdqcr_fc_up_to_3 = 1
  57 };
  58
  59 /*********************************/
  60 /* Portal constructor/destructor */
  61 /*********************************/
  62
  63 /* Software portals should always be in the power-on state when we initialise,
  64  * due to the CCSR-based portal reset functionality that MC has. */
  65 struct qbman_swp *qbman_swp_init(const struct qbman_swp_desc *d)
  66 {
  67         int ret;
  68         struct qbman_swp *p = malloc(sizeof(struct qbman_swp));
  69         u32 major = 0, minor = 0;
  70
  71         if (!p)
  72                 return NULL;
  73         p->desc = d;
  74 #ifdef QBMAN_CHECKING
  75         p->mc.check = swp_mc_can_start;
  76 #endif
  77         p->mc.valid_bit = QB_VALID_BIT;
  78         p->sdq = 0;
  79         qb_attr_code_encode(&code_sdqcr_dct, &p->sdq, qbman_sdqcr_dct_prio_ics);
  80         qb_attr_code_encode(&code_sdqcr_fc, &p->sdq, qbman_sdqcr_fc_up_to_3);
  81         qb_attr_code_encode(&code_sdqcr_tok, &p->sdq, 0xbb);
  82         atomic_set(&p->vdq.busy, 1);
  83         p->vdq.valid_bit = QB_VALID_BIT;
  84         p->dqrr.next_idx = 0;
  85
  86         qbman_version(&major, &minor);
  87         if (!major) {
  88                 printf("invalid qbman version\n");
  89                 return NULL;
  90         }
  91
  92         if (major >= 4 && minor >= 1)
  93                 p->dqrr.dqrr_size = QBMAN_VER_4_1_DQRR_SIZE;
  94         else
  95                 p->dqrr.dqrr_size = QBMAN_VER_4_0_DQRR_SIZE;
  96
  97         p->dqrr.valid_bit = QB_VALID_BIT;
  98         ret = qbman_swp_sys_init(&p->sys, d, p->dqrr.dqrr_size);
  99         if (ret) {
 100                 free(p);
 101                 printf("qbman_swp_sys_init() failed %d\n", ret);
 102                 return NULL;
 103         }
 104         qbman_cinh_write(&p->sys, QBMAN_CINH_SWP_SDQCR, p->sdq);
 105         return p;
 106 }
 107
 108 /***********************/
 109 /* Management commands */
 110 /***********************/
 111
 112 /*
 113  * Internal code common to all types of management commands.
 114  */
 115
 116 void *qbman_swp_mc_start(struct qbman_swp *p)
 117 {
 118         void *ret;
 119         int *return_val;
 120 #ifdef QBMAN_CHECKING
 121         BUG_ON(p->mc.check != swp_mc_can_start);
 122 #endif
 123         ret = qbman_cena_write_start(&p->sys, QBMAN_CENA_SWP_CR);
 124 #ifdef QBMAN_CHECKING
 125         return_val = (int *)ret;
 126         if (!(*return_val))
 127                 p->mc.check = swp_mc_can_submit;
 128 #endif
 129         return ret;
 130 }
 131
 132 void qbman_swp_mc_submit(struct qbman_swp *p, void *cmd, uint32_t cmd_verb)
 133 {
 134         uint32_t *v = cmd;
 135 #ifdef QBMAN_CHECKING
 136         BUG_ON(p->mc.check != swp_mc_can_submit);
 137 #endif
 138         lwsync();
 139         /* TBD: "|=" is going to hurt performance. Need to move as many fields
 140          * out of word zero, and for those that remain, the "OR" needs to occur
 141          * at the caller side. This debug check helps to catch cases where the
 142          * caller wants to OR but has forgotten to do so. */
 143         BUG_ON((*v & cmd_verb) != *v);
 144         *v = cmd_verb | p->mc.valid_bit;
 145         qbman_cena_write_complete(&p->sys, QBMAN_CENA_SWP_CR, cmd);
 146         /* TODO: add prefetch support for GPP */
 147 #ifdef QBMAN_CHECKING
 148         p->mc.check = swp_mc_can_poll;
 149 #endif
 150 }
 151
 152 void *qbman_swp_mc_result(struct qbman_swp *p)
 153 {
 154         uint32_t *ret, verb;
 155 #ifdef QBMAN_CHECKING
 156         BUG_ON(p->mc.check != swp_mc_can_poll);
 157 #endif
 158         ret = qbman_cena_read(&p->sys, QBMAN_CENA_SWP_RR(p->mc.valid_bit));
 159         /* Remove the valid-bit - command completed iff the rest is non-zero */
 160         verb = ret[0] & ~QB_VALID_BIT;
 161         if (!verb)
 162                 return NULL;
 163 #ifdef QBMAN_CHECKING
 164         p->mc.check = swp_mc_can_start;
 165 #endif
 166         p->mc.valid_bit ^= QB_VALID_BIT;
 167         return ret;
 168 }
 169
 170 /***********/
 171 /* Enqueue */
 172 /***********/
 173
 174 /* These should be const, eventually */
 175 static struct qb_attr_code code_eq_cmd = QB_CODE(0, 0, 2);
 176 static struct qb_attr_code code_eq_orp_en = QB_CODE(0, 2, 1);
 177 static struct qb_attr_code code_eq_tgt_id = QB_CODE(2, 0, 24);
 178 /* static struct qb_attr_code code_eq_tag = QB_CODE(3, 0, 32); */
 179 static struct qb_attr_code code_eq_qd_en = QB_CODE(0, 4, 1);
 180 static struct qb_attr_code code_eq_qd_bin = QB_CODE(4, 0, 16);
 181 static struct qb_attr_code code_eq_qd_pri = QB_CODE(4, 16, 4);
 182 static struct qb_attr_code code_eq_rsp_stash = QB_CODE(5, 16, 1);
 183 static struct qb_attr_code code_eq_rsp_lo = QB_CODE(6, 0, 32);
 184
 185 enum qbman_eq_cmd_e {
 186         /* No enqueue, primarily for plugging ORP gaps for dropped frames */
 187         qbman_eq_cmd_empty,
 188         /* DMA an enqueue response once complete */
 189         qbman_eq_cmd_respond,
 190         /* DMA an enqueue response only if the enqueue fails */
 191         qbman_eq_cmd_respond_reject
 192 };
 193
 194 void qbman_eq_desc_clear(struct qbman_eq_desc *d)
 195 {
 196         memset(d, 0, sizeof(*d));
 197 }
 198
 199 void qbman_eq_desc_set_no_orp(struct qbman_eq_desc *d, int respond_success)
 200 {
 201         uint32_t *cl = qb_cl(d);
 202
 203         qb_attr_code_encode(&code_eq_orp_en, cl, 0);
 204         qb_attr_code_encode(&code_eq_cmd, cl,
 205                             respond_success ? qbman_eq_cmd_respond :
 206                                               qbman_eq_cmd_respond_reject);
 207 }
 208
 209 void qbman_eq_desc_set_response(struct qbman_eq_desc *d,
 210                                 dma_addr_t storage_phys,
 211                                 int stash)
 212 {
 213         uint32_t *cl = qb_cl(d);
 214
 215         qb_attr_code_encode_64(&code_eq_rsp_lo, (uint64_t *)cl, storage_phys);
 216         qb_attr_code_encode(&code_eq_rsp_stash, cl, !!stash);
 217 }
 218
 219
 220 void qbman_eq_desc_set_qd(struct qbman_eq_desc *d, uint32_t qdid,
 221                           uint32_t qd_bin, uint32_t qd_prio)
 222 {
 223         uint32_t *cl = qb_cl(d);
 224
 225         qb_attr_code_encode(&code_eq_qd_en, cl, 1);
 226         qb_attr_code_encode(&code_eq_tgt_id, cl, qdid);
 227         qb_attr_code_encode(&code_eq_qd_bin, cl, qd_bin);
 228         qb_attr_code_encode(&code_eq_qd_pri, cl, qd_prio);
 229 }
 230
 231 #define EQAR_IDX(eqar)     ((eqar) & 0x7)
 232 #define EQAR_VB(eqar)      ((eqar) & 0x80)
 233 #define EQAR_SUCCESS(eqar) ((eqar) & 0x100)
 234
 235 int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
 236                       const struct qbman_fd *fd)
 237 {
 238         uint32_t *p;
 239         const uint32_t *cl = qb_cl(d);
 240         uint32_t eqar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_EQAR);
 241         debug("EQAR=%08x\n", eqar);
 242         if (!EQAR_SUCCESS(eqar))
 243                 return -EBUSY;
 244         p = qbman_cena_write_start(&s->sys,
 245                                    QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)));
 246         word_copy(&p[1], &cl[1], 7);
 247         word_copy(&p[8], fd, sizeof(*fd) >> 2);
 248         lwsync();
 249         /* Set the verb byte, have to substitute in the valid-bit */
 250         p[0] = cl[0] | EQAR_VB(eqar);
 251         qbman_cena_write_complete(&s->sys,
 252                                   QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)),
 253                                   p);
 254         return 0;
 255 }
 256
 257 /***************************/
 258 /* Volatile (pull) dequeue */
 259 /***************************/
 260
 261 /* These should be const, eventually */
 262 static struct qb_attr_code code_pull_dct = QB_CODE(0, 0, 2);
 263 static struct qb_attr_code code_pull_dt = QB_CODE(0, 2, 2);
 264 static struct qb_attr_code code_pull_rls = QB_CODE(0, 4, 1);
 265 static struct qb_attr_code code_pull_stash = QB_CODE(0, 5, 1);
 266 static struct qb_attr_code code_pull_numframes = QB_CODE(0, 8, 4);
 267 static struct qb_attr_code code_pull_token = QB_CODE(0, 16, 8);
 268 static struct qb_attr_code code_pull_dqsource = QB_CODE(1, 0, 24);
 269 static struct qb_attr_code code_pull_rsp_lo = QB_CODE(2, 0, 32);
 270
 271 enum qb_pull_dt_e {
 272         qb_pull_dt_channel,
 273         qb_pull_dt_workqueue,
 274         qb_pull_dt_framequeue
 275 };
 276
 277 void qbman_pull_desc_clear(struct qbman_pull_desc *d)
 278 {
 279         memset(d, 0, sizeof(*d));
 280 }
 281
 282 void qbman_pull_desc_set_storage(struct qbman_pull_desc *d,
 283                                  struct ldpaa_dq *storage,
 284                                  dma_addr_t storage_phys,
 285                                  int stash)
 286 {
 287         uint32_t *cl = qb_cl(d);
 288
 289         /* Squiggle the pointer 'storage' into the extra 2 words of the
 290          * descriptor (which aren't copied to the hw command) */
 291         *(void **)&cl[4] = storage;
 292         if (!storage) {
 293                 qb_attr_code_encode(&code_pull_rls, cl, 0);
 294                 return;
 295         }
 296         qb_attr_code_encode(&code_pull_rls, cl, 1);
 297         qb_attr_code_encode(&code_pull_stash, cl, !!stash);
 298         qb_attr_code_encode_64(&code_pull_rsp_lo, (uint64_t *)cl, storage_phys);
 299 }
 300
 301 void qbman_pull_desc_set_numframes(struct qbman_pull_desc *d, uint8_t numframes)
 302 {
 303         uint32_t *cl = qb_cl(d);
 304
 305         BUG_ON(!numframes || (numframes > 16));
 306         qb_attr_code_encode(&code_pull_numframes, cl,
 307                             (uint32_t)(numframes - 1));
 308 }
 309
 310 void qbman_pull_desc_set_token(struct qbman_pull_desc *d, uint8_t token)
 311 {
 312         uint32_t *cl = qb_cl(d);
 313
 314         qb_attr_code_encode(&code_pull_token, cl, token);
 315 }
 316
 317 void qbman_pull_desc_set_fq(struct qbman_pull_desc *d, uint32_t fqid)
 318 {
 319         uint32_t *cl = qb_cl(d);
 320
 321         qb_attr_code_encode(&code_pull_dct, cl, 1);
 322         qb_attr_code_encode(&code_pull_dt, cl, qb_pull_dt_framequeue);
 323         qb_attr_code_encode(&code_pull_dqsource, cl, fqid);
 324 }
 325
 326 int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 327 {
 328         uint32_t *p;
 329         uint32_t *cl = qb_cl(d);
 330
 331         if (!atomic_dec_and_test(&s->vdq.busy)) {
 332                 atomic_inc(&s->vdq.busy);
 333                 return -EBUSY;
 334         }
 335         s->vdq.storage = *(void **)&cl[4];
 336         s->vdq.token = qb_attr_code_decode(&code_pull_token, cl);
 337         p = qbman_cena_write_start(&s->sys, QBMAN_CENA_SWP_VDQCR);
 338         word_copy(&p[1], &cl[1], 3);
 339         lwsync();
 340         /* Set the verb byte, have to substitute in the valid-bit */
 341         p[0] = cl[0] | s->vdq.valid_bit;
 342         s->vdq.valid_bit ^= QB_VALID_BIT;
 343         qbman_cena_write_complete(&s->sys, QBMAN_CENA_SWP_VDQCR, p);
 344         return 0;
 345 }
 346
 347 /****************/
 348 /* Polling DQRR */
 349 /****************/
 350
 351 static struct qb_attr_code code_dqrr_verb = QB_CODE(0, 0, 8);
 352 static struct qb_attr_code code_dqrr_response = QB_CODE(0, 0, 7);
 353 static struct qb_attr_code code_dqrr_stat = QB_CODE(0, 8, 8);
 354
 355 #define QBMAN_DQRR_RESPONSE_DQ        0x60
 356 #define QBMAN_DQRR_RESPONSE_FQRN      0x21
 357 #define QBMAN_DQRR_RESPONSE_FQRNI     0x22
 358 #define QBMAN_DQRR_RESPONSE_FQPN      0x24
 359 #define QBMAN_DQRR_RESPONSE_FQDAN     0x25
 360 #define QBMAN_DQRR_RESPONSE_CDAN      0x26
 361 #define QBMAN_DQRR_RESPONSE_CSCN_MEM  0x27
 362 #define QBMAN_DQRR_RESPONSE_CGCU      0x28
 363 #define QBMAN_DQRR_RESPONSE_BPSCN     0x29
 364 #define QBMAN_DQRR_RESPONSE_CSCN_WQ   0x2a
 365
 366
 367 /* NULL return if there are no unconsumed DQRR entries. Returns a DQRR entry
 368  * only once, so repeated calls can return a sequence of DQRR entries, without
 369  * requiring they be consumed immediately or in any particular order. */
 370 const struct ldpaa_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
 371 {
 372         uint32_t verb;
 373         uint32_t response_verb;
 374         uint32_t flags;
 375         const struct ldpaa_dq *dq;
 376         const uint32_t *p;
 377
 378         dq = qbman_cena_read(&s->sys, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 379         p = qb_cl(dq);
 380         verb = qb_attr_code_decode(&code_dqrr_verb, p);
 381
 382         /* If the valid-bit isn't of the expected polarity, nothing there. Note,
 383          * in the DQRR reset bug workaround, we shouldn't need to skip these
 384          * check, because we've already determined that a new entry is available
 385          * and we've invalidated the cacheline before reading it, so the
 386          * valid-bit behaviour is repaired and should tell us what we already
 387          * knew from reading PI.
 388          */
 389         if ((verb & QB_VALID_BIT) != s->dqrr.valid_bit) {
 390                 qbman_cena_invalidate_prefetch(&s->sys,
 391                                         QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 392                 return NULL;
 393         }
 394         /* There's something there. Move "next_idx" attention to the next ring
 395          * entry (and prefetch it) before returning what we found. */
 396         s->dqrr.next_idx++;
 397         s->dqrr.next_idx &= s->dqrr.dqrr_size - 1;/* Wrap around at dqrr_size */
 398         /* TODO: it's possible to do all this without conditionals, optimise it
 399          * later. */
 400         if (!s->dqrr.next_idx)
 401                 s->dqrr.valid_bit ^= QB_VALID_BIT;
 402
 403         /* If this is the final response to a volatile dequeue command
 404            indicate that the vdq is no longer busy */
 405         flags = ldpaa_dq_flags(dq);
 406         response_verb = qb_attr_code_decode(&code_dqrr_response, &verb);
 407         if ((response_verb == QBMAN_DQRR_RESPONSE_DQ) &&
 408             (flags & LDPAA_DQ_STAT_VOLATILE) &&
 409             (flags & LDPAA_DQ_STAT_EXPIRED))
 410                         atomic_inc(&s->vdq.busy);
 411
 412         qbman_cena_invalidate_prefetch(&s->sys,
 413                                        QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 414         return dq;
 415 }
 416
 417 /* Consume DQRR entries previously returned from qbman_swp_dqrr_next(). */
 418 void qbman_swp_dqrr_consume(struct qbman_swp *s, const struct ldpaa_dq *dq)
 419 {
 420         qbman_cinh_write(&s->sys, QBMAN_CINH_SWP_DCAP, QBMAN_IDX_FROM_DQRR(dq));
 421 }
 422
 423 /*********************************/
 424 /* Polling user-provided storage */
 425 /*********************************/
 426
 427 void qbman_dq_entry_set_oldtoken(struct ldpaa_dq *dq,
 428                                  unsigned int num_entries,
 429                                  uint8_t oldtoken)
 430 {
 431         memset(dq, oldtoken, num_entries * sizeof(*dq));
 432 }
 433
 434 int qbman_dq_entry_has_newtoken(struct qbman_swp *s,
 435                                 const struct ldpaa_dq *dq,
 436                                 uint8_t newtoken)
 437 {
 438         /* To avoid converting the little-endian DQ entry to host-endian prior
 439          * to us knowing whether there is a valid entry or not (and run the
 440          * risk of corrupting the incoming hardware LE write), we detect in
 441          * hardware endianness rather than host. This means we need a different
 442          * "code" depending on whether we are BE or LE in software, which is
 443          * where DQRR_TOK_OFFSET comes in... */
 444         static struct qb_attr_code code_dqrr_tok_detect =
 445                                         QB_CODE(0, DQRR_TOK_OFFSET, 8);
 446         /* The user trying to poll for a result treats "dq" as const. It is
 447          * however the same address that was provided to us non-const in the
 448          * first place, for directing hardware DMA to. So we can cast away the
 449          * const because it is mutable from our perspective. */
 450         uint32_t *p = qb_cl((struct ldpaa_dq *)dq);
 451         uint32_t token;
 452
 453         token = qb_attr_code_decode(&code_dqrr_tok_detect, &p[1]);
 454         if (token != newtoken)
 455                 return 0;
 456
 457         /* Only now do we convert from hardware to host endianness. Also, as we
 458          * are returning success, the user has promised not to call us again, so
 459          * there's no risk of us converting the endianness twice... */
 460         make_le32_n(p, 16);
 461
 462         /* VDQCR "no longer busy" hook - not quite the same as DQRR, because the
 463          * fact "VDQCR" shows busy doesn't mean that the result we're looking at
 464          * is from the same command. Eg. we may be looking at our 10th dequeue
 465          * result from our first VDQCR command, yet the second dequeue command
 466          * could have been kicked off already, after seeing the 1st result. Ie.
 467          * the result we're looking at is not necessarily proof that we can
 468          * reset "busy".  We instead base the decision on whether the current
 469          * result is sitting at the first 'storage' location of the busy
 470          * command. */
 471         if (s->vdq.storage == dq) {
 472                 s->vdq.storage = NULL;
 473                         atomic_inc(&s->vdq.busy);
 474         }
 475         return 1;
 476 }
 477
 478 /********************************/
 479 /* Categorising dequeue entries */
 480 /********************************/
 481
 482 static inline int __qbman_dq_entry_is_x(const struct ldpaa_dq *dq, uint32_t x)
 483 {
 484         const uint32_t *p = qb_cl(dq);
 485         uint32_t response_verb = qb_attr_code_decode(&code_dqrr_response, p);
 486
 487         return response_verb == x;
 488 }
 489
 490 int qbman_dq_entry_is_DQ(const struct ldpaa_dq *dq)
 491 {
 492         return __qbman_dq_entry_is_x(dq, QBMAN_DQRR_RESPONSE_DQ);
 493 }
 494
 495 /*********************************/
 496 /* Parsing frame dequeue results */
 497 /*********************************/
 498
 499 /* These APIs assume qbman_dq_entry_is_DQ() is TRUE */
 500
 501 uint32_t ldpaa_dq_flags(const struct ldpaa_dq *dq)
 502 {
 503         const uint32_t *p = qb_cl(dq);
 504
 505         return qb_attr_code_decode(&code_dqrr_stat, p);
 506 }
 507
 508 const struct dpaa_fd *ldpaa_dq_fd(const struct ldpaa_dq *dq)
 509 {
 510         const uint32_t *p = qb_cl(dq);
 511
 512         return (const struct dpaa_fd *)&p[8];
 513 }
 514
 515 /******************/
 516 /* Buffer release */
 517 /******************/
 518
 519 /* These should be const, eventually */
 520 /* static struct qb_attr_code code_release_num = QB_CODE(0, 0, 3); */
 521 static struct qb_attr_code code_release_set_me = QB_CODE(0, 5, 1);
 522 static struct qb_attr_code code_release_bpid = QB_CODE(0, 16, 16);
 523
 524 void qbman_release_desc_clear(struct qbman_release_desc *d)
 525 {
 526         uint32_t *cl;
 527
 528         memset(d, 0, sizeof(*d));
 529         cl = qb_cl(d);
 530         qb_attr_code_encode(&code_release_set_me, cl, 1);
 531 }
 532
 533 void qbman_release_desc_set_bpid(struct qbman_release_desc *d, uint32_t bpid)
 534 {
 535         uint32_t *cl = qb_cl(d);
 536
 537         qb_attr_code_encode(&code_release_bpid, cl, bpid);
 538 }
 539
 540 #define RAR_IDX(rar)     ((rar) & 0x7)
 541 #define RAR_VB(rar)      ((rar) & 0x80)
 542 #define RAR_SUCCESS(rar) ((rar) & 0x100)
 543
 544 int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
 545                       const uint64_t *buffers, unsigned int num_buffers)
 546 {
 547         uint32_t *p;
 548         const uint32_t *cl = qb_cl(d);
 549         uint32_t rar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_RAR);
 550         debug("RAR=%08x\n", rar);
 551         if (!RAR_SUCCESS(rar))
 552                 return -EBUSY;
 553         BUG_ON(!num_buffers || (num_buffers > 7));
 554         /* Start the release command */
 555         p = qbman_cena_write_start(&s->sys,
 556                                    QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
 557         /* Copy the caller's buffer pointers to the command */
 558         u64_to_le32_copy(&p[2], buffers, num_buffers);
 559         lwsync();
 560         /* Set the verb byte, have to substitute in the valid-bit and the number
 561          * of buffers. */
 562         p[0] = cl[0] | RAR_VB(rar) | num_buffers;
 563         qbman_cena_write_complete(&s->sys,
 564                                   QBMAN_CENA_SWP_RCR(RAR_IDX(rar)),
 565                                   p);
 566         return 0;
 567 }
 568
 569 /*******************/
 570 /* Buffer acquires */
 571 /*******************/
 572
 573 /* These should be const, eventually */
 574 static struct qb_attr_code code_acquire_bpid = QB_CODE(0, 16, 16);
 575 static struct qb_attr_code code_acquire_num = QB_CODE(1, 0, 3);
 576 static struct qb_attr_code code_acquire_r_num = QB_CODE(1, 0, 3);
 577
 578 int qbman_swp_acquire(struct qbman_swp *s, uint32_t bpid, uint64_t *buffers,
 579                       unsigned int num_buffers)
 580 {
 581         uint32_t *p;
 582         uint32_t verb, rslt, num;
 583
 584         BUG_ON(!num_buffers || (num_buffers > 7));
 585
 586         /* Start the management command */
 587         p = qbman_swp_mc_start(s);
 588
 589         if (!p)
 590                 return -EBUSY;
 591
 592         /* Encode the caller-provided attributes */
 593         qb_attr_code_encode(&code_acquire_bpid, p, bpid);
 594         qb_attr_code_encode(&code_acquire_num, p, num_buffers);
 595
 596         /* Complete the management command */
 597         p = qbman_swp_mc_complete(s, p, p[0] | QBMAN_MC_ACQUIRE);
 598
 599         /* Decode the outcome */
 600         verb = qb_attr_code_decode(&code_generic_verb, p);
 601         rslt = qb_attr_code_decode(&code_generic_rslt, p);
 602         num = qb_attr_code_decode(&code_acquire_r_num, p);
 603         BUG_ON(verb != QBMAN_MC_ACQUIRE);
 604
 605         /* Determine success or failure */
 606         if (unlikely(rslt != QBMAN_MC_RSLT_OK)) {
 607                 printf("Acquire buffers from BPID 0x%x failed, code=0x%02x\n",
 608                        bpid, rslt);
 609                 return -EIO;
 610         }
 611         BUG_ON(num > num_buffers);
 612         /* Copy the acquired buffers to the caller's array */
 613         u64_from_le32_copy(buffers, &p[2], num);
 614         return (int)num;
 615 }