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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2014 Freescale Semiconductor
   4  */
   5
   6 #include <log.h>
   7 #include <malloc.h>
   8 #include <asm/arch/clock.h>
   9 #include "qbman_portal.h"
  10
  11 /* QBMan portal management command codes */
  12 #define QBMAN_MC_ACQUIRE       0x30
  13 #define QBMAN_WQCHAN_CONFIGURE 0x46
  14
  15 /* CINH register offsets */
  16 #define QBMAN_CINH_SWP_EQAR    0x8c0
  17 #define QBMAN_CINH_SWP_DCAP    0xac0
  18 #define QBMAN_CINH_SWP_SDQCR   0xb00
  19 #define QBMAN_CINH_SWP_RAR     0xcc0
  20
  21 /* CENA register offsets */
  22 #define QBMAN_CENA_SWP_EQCR(n) (0x000 + ((uint32_t)(n) << 6))
  23 #define QBMAN_CENA_SWP_DQRR(n) (0x200 + ((uint32_t)(n) << 6))
  24 #define QBMAN_CENA_SWP_RCR(n)  (0x400 + ((uint32_t)(n) << 6))
  25 #define QBMAN_CENA_SWP_CR      0x600
  26 #define QBMAN_CENA_SWP_RR(vb)  (0x700 + ((uint32_t)(vb) >> 1))
  27 #define QBMAN_CENA_SWP_VDQCR   0x780
  28
  29 /* Reverse mapping of QBMAN_CENA_SWP_DQRR() */
  30 #define QBMAN_IDX_FROM_DQRR(p) (((unsigned long)p & 0x1ff) >> 6)
  31
  32 /*******************************/
  33 /* Pre-defined attribute codes */
  34 /*******************************/
  35
  36 struct qb_attr_code code_generic_verb = QB_CODE(0, 0, 7);
  37 struct qb_attr_code code_generic_rslt = QB_CODE(0, 8, 8);
  38
  39 /*************************/
  40 /* SDQCR attribute codes */
  41 /*************************/
  42
  43 /* we put these here because at least some of them are required by
  44  * qbman_swp_init() */
  45 struct qb_attr_code code_sdqcr_dct = QB_CODE(0, 24, 2);
  46 struct qb_attr_code code_sdqcr_fc = QB_CODE(0, 29, 1);
  47 struct qb_attr_code code_sdqcr_tok = QB_CODE(0, 16, 8);
  48 #define CODE_SDQCR_DQSRC(n) QB_CODE(0, n, 1)
  49 enum qbman_sdqcr_dct {
  50         qbman_sdqcr_dct_null = 0,
  51         qbman_sdqcr_dct_prio_ics,
  52         qbman_sdqcr_dct_active_ics,
  53         qbman_sdqcr_dct_active
  54 };
  55 enum qbman_sdqcr_fc {
  56         qbman_sdqcr_fc_one = 0,
  57         qbman_sdqcr_fc_up_to_3 = 1
  58 };
  59
  60 /*********************************/
  61 /* Portal constructor/destructor */
  62 /*********************************/
  63
  64 /* Software portals should always be in the power-on state when we initialise,
  65  * due to the CCSR-based portal reset functionality that MC has. */
  66 struct qbman_swp *qbman_swp_init(const struct qbman_swp_desc *d)
  67 {
  68         int ret;
  69         struct qbman_swp *p = malloc(sizeof(struct qbman_swp));
  70         u32 major = 0, minor = 0;
  71
  72         if (!p)
  73                 return NULL;
  74         p->desc = d;
  75 #ifdef QBMAN_CHECKING
  76         p->mc.check = swp_mc_can_start;
  77 #endif
  78         p->mc.valid_bit = QB_VALID_BIT;
  79         p->sdq = 0;
  80         qb_attr_code_encode(&code_sdqcr_dct, &p->sdq, qbman_sdqcr_dct_prio_ics);
  81         qb_attr_code_encode(&code_sdqcr_fc, &p->sdq, qbman_sdqcr_fc_up_to_3);
  82         qb_attr_code_encode(&code_sdqcr_tok, &p->sdq, 0xbb);
  83         atomic_set(&p->vdq.busy, 1);
  84         p->vdq.valid_bit = QB_VALID_BIT;
  85         p->dqrr.next_idx = 0;
  86
  87         qbman_version(&major, &minor);
  88         if (!major) {
  89                 printf("invalid qbman version\n");
  90                 return NULL;
  91         }
  92
  93         if (major >= 4 && minor >= 1)
  94                 p->dqrr.dqrr_size = QBMAN_VER_4_1_DQRR_SIZE;
  95         else
  96                 p->dqrr.dqrr_size = QBMAN_VER_4_0_DQRR_SIZE;
  97
  98         p->dqrr.valid_bit = QB_VALID_BIT;
  99         ret = qbman_swp_sys_init(&p->sys, d, p->dqrr.dqrr_size);
 100         if (ret) {
 101                 free(p);
 102                 printf("qbman_swp_sys_init() failed %d\n", ret);
 103                 return NULL;
 104         }
 105         qbman_cinh_write(&p->sys, QBMAN_CINH_SWP_SDQCR, p->sdq);
 106         return p;
 107 }
 108
 109 /***********************/
 110 /* Management commands */
 111 /***********************/
 112
 113 /*
 114  * Internal code common to all types of management commands.
 115  */
 116
 117 void *qbman_swp_mc_start(struct qbman_swp *p)
 118 {
 119         void *ret;
 120         int *return_val;
 121 #ifdef QBMAN_CHECKING
 122         BUG_ON(p->mc.check != swp_mc_can_start);
 123 #endif
 124         ret = qbman_cena_write_start(&p->sys, QBMAN_CENA_SWP_CR);
 125 #ifdef QBMAN_CHECKING
 126         return_val = (int *)ret;
 127         if (!(*return_val))
 128                 p->mc.check = swp_mc_can_submit;
 129 #endif
 130         return ret;
 131 }
 132
 133 void qbman_swp_mc_submit(struct qbman_swp *p, void *cmd, uint32_t cmd_verb)
 134 {
 135         uint32_t *v = cmd;
 136 #ifdef QBMAN_CHECKING
 137         BUG_ON(p->mc.check != swp_mc_can_submit);
 138 #endif
 139         lwsync();
 140         /* TBD: "|=" is going to hurt performance. Need to move as many fields
 141          * out of word zero, and for those that remain, the "OR" needs to occur
 142          * at the caller side. This debug check helps to catch cases where the
 143          * caller wants to OR but has forgotten to do so. */
 144         BUG_ON((*v & cmd_verb) != *v);
 145         *v = cmd_verb | p->mc.valid_bit;
 146         qbman_cena_write_complete(&p->sys, QBMAN_CENA_SWP_CR, cmd);
 147         /* TODO: add prefetch support for GPP */
 148 #ifdef QBMAN_CHECKING
 149         p->mc.check = swp_mc_can_poll;
 150 #endif
 151 }
 152
 153 void *qbman_swp_mc_result(struct qbman_swp *p)
 154 {
 155         uint32_t *ret, verb;
 156 #ifdef QBMAN_CHECKING
 157         BUG_ON(p->mc.check != swp_mc_can_poll);
 158 #endif
 159         ret = qbman_cena_read(&p->sys, QBMAN_CENA_SWP_RR(p->mc.valid_bit));
 160         /* Remove the valid-bit - command completed iff the rest is non-zero */
 161         verb = ret[0] & ~QB_VALID_BIT;
 162         if (!verb)
 163                 return NULL;
 164 #ifdef QBMAN_CHECKING
 165         p->mc.check = swp_mc_can_start;
 166 #endif
 167         p->mc.valid_bit ^= QB_VALID_BIT;
 168         return ret;
 169 }
 170
 171 /***********/
 172 /* Enqueue */
 173 /***********/
 174
 175 /* These should be const, eventually */
 176 static struct qb_attr_code code_eq_cmd = QB_CODE(0, 0, 2);
 177 static struct qb_attr_code code_eq_orp_en = QB_CODE(0, 2, 1);
 178 static struct qb_attr_code code_eq_tgt_id = QB_CODE(2, 0, 24);
 179 /* static struct qb_attr_code code_eq_tag = QB_CODE(3, 0, 32); */
 180 static struct qb_attr_code code_eq_qd_en = QB_CODE(0, 4, 1);
 181 static struct qb_attr_code code_eq_qd_bin = QB_CODE(4, 0, 16);
 182 static struct qb_attr_code code_eq_qd_pri = QB_CODE(4, 16, 4);
 183 static struct qb_attr_code code_eq_rsp_stash = QB_CODE(5, 16, 1);
 184 static struct qb_attr_code code_eq_rsp_lo = QB_CODE(6, 0, 32);
 185
 186 enum qbman_eq_cmd_e {
 187         /* No enqueue, primarily for plugging ORP gaps for dropped frames */
 188         qbman_eq_cmd_empty,
 189         /* DMA an enqueue response once complete */
 190         qbman_eq_cmd_respond,
 191         /* DMA an enqueue response only if the enqueue fails */
 192         qbman_eq_cmd_respond_reject
 193 };
 194
 195 void qbman_eq_desc_clear(struct qbman_eq_desc *d)
 196 {
 197         memset(d, 0, sizeof(*d));
 198 }
 199
 200 void qbman_eq_desc_set_no_orp(struct qbman_eq_desc *d, int respond_success)
 201 {
 202         uint32_t *cl = qb_cl(d);
 203
 204         qb_attr_code_encode(&code_eq_orp_en, cl, 0);
 205         qb_attr_code_encode(&code_eq_cmd, cl,
 206                             respond_success ? qbman_eq_cmd_respond :
 207                                               qbman_eq_cmd_respond_reject);
 208 }
 209
 210 void qbman_eq_desc_set_response(struct qbman_eq_desc *d,
 211                                 dma_addr_t storage_phys,
 212                                 int stash)
 213 {
 214         uint32_t *cl = qb_cl(d);
 215
 216         qb_attr_code_encode_64(&code_eq_rsp_lo, (uint64_t *)cl, storage_phys);
 217         qb_attr_code_encode(&code_eq_rsp_stash, cl, !!stash);
 218 }
 219
 220
 221 void qbman_eq_desc_set_qd(struct qbman_eq_desc *d, uint32_t qdid,
 222                           uint32_t qd_bin, uint32_t qd_prio)
 223 {
 224         uint32_t *cl = qb_cl(d);
 225
 226         qb_attr_code_encode(&code_eq_qd_en, cl, 1);
 227         qb_attr_code_encode(&code_eq_tgt_id, cl, qdid);
 228         qb_attr_code_encode(&code_eq_qd_bin, cl, qd_bin);
 229         qb_attr_code_encode(&code_eq_qd_pri, cl, qd_prio);
 230 }
 231
 232 #define EQAR_IDX(eqar)     ((eqar) & 0x7)
 233 #define EQAR_VB(eqar)      ((eqar) & 0x80)
 234 #define EQAR_SUCCESS(eqar) ((eqar) & 0x100)
 235
 236 int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
 237                       const struct qbman_fd *fd)
 238 {
 239         uint32_t *p;
 240         const uint32_t *cl = qb_cl(d);
 241         uint32_t eqar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_EQAR);
 242         debug("EQAR=%08x\n", eqar);
 243         if (!EQAR_SUCCESS(eqar))
 244                 return -EBUSY;
 245         p = qbman_cena_write_start(&s->sys,
 246                                    QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)));
 247         word_copy(&p[1], &cl[1], 7);
 248         word_copy(&p[8], fd, sizeof(*fd) >> 2);
 249         lwsync();
 250         /* Set the verb byte, have to substitute in the valid-bit */
 251         p[0] = cl[0] | EQAR_VB(eqar);
 252         qbman_cena_write_complete(&s->sys,
 253                                   QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)),
 254                                   p);
 255         return 0;
 256 }
 257
 258 /***************************/
 259 /* Volatile (pull) dequeue */
 260 /***************************/
 261
 262 /* These should be const, eventually */
 263 static struct qb_attr_code code_pull_dct = QB_CODE(0, 0, 2);
 264 static struct qb_attr_code code_pull_dt = QB_CODE(0, 2, 2);
 265 static struct qb_attr_code code_pull_rls = QB_CODE(0, 4, 1);
 266 static struct qb_attr_code code_pull_stash = QB_CODE(0, 5, 1);
 267 static struct qb_attr_code code_pull_numframes = QB_CODE(0, 8, 4);
 268 static struct qb_attr_code code_pull_token = QB_CODE(0, 16, 8);
 269 static struct qb_attr_code code_pull_dqsource = QB_CODE(1, 0, 24);
 270 static struct qb_attr_code code_pull_rsp_lo = QB_CODE(2, 0, 32);
 271
 272 enum qb_pull_dt_e {
 273         qb_pull_dt_channel,
 274         qb_pull_dt_workqueue,
 275         qb_pull_dt_framequeue
 276 };
 277
 278 void qbman_pull_desc_clear(struct qbman_pull_desc *d)
 279 {
 280         memset(d, 0, sizeof(*d));
 281 }
 282
 283 void qbman_pull_desc_set_storage(struct qbman_pull_desc *d,
 284                                  struct ldpaa_dq *storage,
 285                                  dma_addr_t storage_phys,
 286                                  int stash)
 287 {
 288         uint32_t *cl = qb_cl(d);
 289
 290         /* Squiggle the pointer 'storage' into the extra 2 words of the
 291          * descriptor (which aren't copied to the hw command) */
 292         *(void **)&cl[4] = storage;
 293         if (!storage) {
 294                 qb_attr_code_encode(&code_pull_rls, cl, 0);
 295                 return;
 296         }
 297         qb_attr_code_encode(&code_pull_rls, cl, 1);
 298         qb_attr_code_encode(&code_pull_stash, cl, !!stash);
 299         qb_attr_code_encode_64(&code_pull_rsp_lo, (uint64_t *)cl, storage_phys);
 300 }
 301
 302 void qbman_pull_desc_set_numframes(struct qbman_pull_desc *d, uint8_t numframes)
 303 {
 304         uint32_t *cl = qb_cl(d);
 305
 306         BUG_ON(!numframes || (numframes > 16));
 307         qb_attr_code_encode(&code_pull_numframes, cl,
 308                             (uint32_t)(numframes - 1));
 309 }
 310
 311 void qbman_pull_desc_set_token(struct qbman_pull_desc *d, uint8_t token)
 312 {
 313         uint32_t *cl = qb_cl(d);
 314
 315         qb_attr_code_encode(&code_pull_token, cl, token);
 316 }
 317
 318 void qbman_pull_desc_set_fq(struct qbman_pull_desc *d, uint32_t fqid)
 319 {
 320         uint32_t *cl = qb_cl(d);
 321
 322         qb_attr_code_encode(&code_pull_dct, cl, 1);
 323         qb_attr_code_encode(&code_pull_dt, cl, qb_pull_dt_framequeue);
 324         qb_attr_code_encode(&code_pull_dqsource, cl, fqid);
 325 }
 326
 327 int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 328 {
 329         uint32_t *p;
 330         uint32_t *cl = qb_cl(d);
 331
 332         if (!atomic_dec_and_test(&s->vdq.busy)) {
 333                 atomic_inc(&s->vdq.busy);
 334                 return -EBUSY;
 335         }
 336         s->vdq.storage = *(void **)&cl[4];
 337         s->vdq.token = qb_attr_code_decode(&code_pull_token, cl);
 338         p = qbman_cena_write_start(&s->sys, QBMAN_CENA_SWP_VDQCR);
 339         word_copy(&p[1], &cl[1], 3);
 340         lwsync();
 341         /* Set the verb byte, have to substitute in the valid-bit */
 342         p[0] = cl[0] | s->vdq.valid_bit;
 343         s->vdq.valid_bit ^= QB_VALID_BIT;
 344         qbman_cena_write_complete(&s->sys, QBMAN_CENA_SWP_VDQCR, p);
 345         return 0;
 346 }
 347
 348 /****************/
 349 /* Polling DQRR */
 350 /****************/
 351
 352 static struct qb_attr_code code_dqrr_verb = QB_CODE(0, 0, 8);
 353 static struct qb_attr_code code_dqrr_response = QB_CODE(0, 0, 7);
 354 static struct qb_attr_code code_dqrr_stat = QB_CODE(0, 8, 8);
 355
 356 #define QBMAN_DQRR_RESPONSE_DQ        0x60
 357 #define QBMAN_DQRR_RESPONSE_FQRN      0x21
 358 #define QBMAN_DQRR_RESPONSE_FQRNI     0x22
 359 #define QBMAN_DQRR_RESPONSE_FQPN      0x24
 360 #define QBMAN_DQRR_RESPONSE_FQDAN     0x25
 361 #define QBMAN_DQRR_RESPONSE_CDAN      0x26
 362 #define QBMAN_DQRR_RESPONSE_CSCN_MEM  0x27
 363 #define QBMAN_DQRR_RESPONSE_CGCU      0x28
 364 #define QBMAN_DQRR_RESPONSE_BPSCN     0x29
 365 #define QBMAN_DQRR_RESPONSE_CSCN_WQ   0x2a
 366
 367
 368 /* NULL return if there are no unconsumed DQRR entries. Returns a DQRR entry
 369  * only once, so repeated calls can return a sequence of DQRR entries, without
 370  * requiring they be consumed immediately or in any particular order. */
 371 const struct ldpaa_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
 372 {
 373         uint32_t verb;
 374         uint32_t response_verb;
 375         uint32_t flags;
 376         const struct ldpaa_dq *dq;
 377         const uint32_t *p;
 378
 379         dq = qbman_cena_read(&s->sys, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 380         p = qb_cl(dq);
 381         verb = qb_attr_code_decode(&code_dqrr_verb, p);
 382
 383         /* If the valid-bit isn't of the expected polarity, nothing there. Note,
 384          * in the DQRR reset bug workaround, we shouldn't need to skip these
 385          * check, because we've already determined that a new entry is available
 386          * and we've invalidated the cacheline before reading it, so the
 387          * valid-bit behaviour is repaired and should tell us what we already
 388          * knew from reading PI.
 389          */
 390         if ((verb & QB_VALID_BIT) != s->dqrr.valid_bit) {
 391                 qbman_cena_invalidate_prefetch(&s->sys,
 392                                         QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 393                 return NULL;
 394         }
 395         /* There's something there. Move "next_idx" attention to the next ring
 396          * entry (and prefetch it) before returning what we found. */
 397         s->dqrr.next_idx++;
 398         s->dqrr.next_idx &= s->dqrr.dqrr_size - 1;/* Wrap around at dqrr_size */
 399         /* TODO: it's possible to do all this without conditionals, optimise it
 400          * later. */
 401         if (!s->dqrr.next_idx)
 402                 s->dqrr.valid_bit ^= QB_VALID_BIT;
 403
 404         /* If this is the final response to a volatile dequeue command
 405            indicate that the vdq is no longer busy */
 406         flags = ldpaa_dq_flags(dq);
 407         response_verb = qb_attr_code_decode(&code_dqrr_response, &verb);
 408         if ((response_verb == QBMAN_DQRR_RESPONSE_DQ) &&
 409             (flags & LDPAA_DQ_STAT_VOLATILE) &&
 410             (flags & LDPAA_DQ_STAT_EXPIRED))
 411                         atomic_inc(&s->vdq.busy);
 412
 413         qbman_cena_invalidate_prefetch(&s->sys,
 414                                        QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 415         return dq;
 416 }
 417
 418 /* Consume DQRR entries previously returned from qbman_swp_dqrr_next(). */
 419 void qbman_swp_dqrr_consume(struct qbman_swp *s, const struct ldpaa_dq *dq)
 420 {
 421         qbman_cinh_write(&s->sys, QBMAN_CINH_SWP_DCAP, QBMAN_IDX_FROM_DQRR(dq));
 422 }
 423
 424 /*********************************/
 425 /* Polling user-provided storage */
 426 /*********************************/
 427
 428 void qbman_dq_entry_set_oldtoken(struct ldpaa_dq *dq,
 429                                  unsigned int num_entries,
 430                                  uint8_t oldtoken)
 431 {
 432         memset(dq, oldtoken, num_entries * sizeof(*dq));
 433 }
 434
 435 int qbman_dq_entry_has_newtoken(struct qbman_swp *s,
 436                                 const struct ldpaa_dq *dq,
 437                                 uint8_t newtoken)
 438 {
 439         /* To avoid converting the little-endian DQ entry to host-endian prior
 440          * to us knowing whether there is a valid entry or not (and run the
 441          * risk of corrupting the incoming hardware LE write), we detect in
 442          * hardware endianness rather than host. This means we need a different
 443          * "code" depending on whether we are BE or LE in software, which is
 444          * where DQRR_TOK_OFFSET comes in... */
 445         static struct qb_attr_code code_dqrr_tok_detect =
 446                                         QB_CODE(0, DQRR_TOK_OFFSET, 8);
 447         /* The user trying to poll for a result treats "dq" as const. It is
 448          * however the same address that was provided to us non-const in the
 449          * first place, for directing hardware DMA to. So we can cast away the
 450          * const because it is mutable from our perspective. */
 451         uint32_t *p = qb_cl((struct ldpaa_dq *)dq);
 452         uint32_t token;
 453
 454         token = qb_attr_code_decode(&code_dqrr_tok_detect, &p[1]);
 455         if (token != newtoken)
 456                 return 0;
 457
 458         /* Only now do we convert from hardware to host endianness. Also, as we
 459          * are returning success, the user has promised not to call us again, so
 460          * there's no risk of us converting the endianness twice... */
 461         make_le32_n(p, 16);
 462
 463         /* VDQCR "no longer busy" hook - not quite the same as DQRR, because the
 464          * fact "VDQCR" shows busy doesn't mean that the result we're looking at
 465          * is from the same command. Eg. we may be looking at our 10th dequeue
 466          * result from our first VDQCR command, yet the second dequeue command
 467          * could have been kicked off already, after seeing the 1st result. Ie.
 468          * the result we're looking at is not necessarily proof that we can
 469          * reset "busy".  We instead base the decision on whether the current
 470          * result is sitting at the first 'storage' location of the busy
 471          * command. */
 472         if (s->vdq.storage == dq) {
 473                 s->vdq.storage = NULL;
 474                         atomic_inc(&s->vdq.busy);
 475         }
 476         return 1;
 477 }
 478
 479 /********************************/
 480 /* Categorising dequeue entries */
 481 /********************************/
 482
 483 static inline int __qbman_dq_entry_is_x(const struct ldpaa_dq *dq, uint32_t x)
 484 {
 485         const uint32_t *p = qb_cl(dq);
 486         uint32_t response_verb = qb_attr_code_decode(&code_dqrr_response, p);
 487
 488         return response_verb == x;
 489 }
 490
 491 int qbman_dq_entry_is_DQ(const struct ldpaa_dq *dq)
 492 {
 493         return __qbman_dq_entry_is_x(dq, QBMAN_DQRR_RESPONSE_DQ);
 494 }
 495
 496 /*********************************/
 497 /* Parsing frame dequeue results */
 498 /*********************************/
 499
 500 /* These APIs assume qbman_dq_entry_is_DQ() is TRUE */
 501
 502 uint32_t ldpaa_dq_flags(const struct ldpaa_dq *dq)
 503 {
 504         const uint32_t *p = qb_cl(dq);
 505
 506         return qb_attr_code_decode(&code_dqrr_stat, p);
 507 }
 508
 509 const struct dpaa_fd *ldpaa_dq_fd(const struct ldpaa_dq *dq)
 510 {
 511         const uint32_t *p = qb_cl(dq);
 512
 513         return (const struct dpaa_fd *)&p[8];
 514 }
 515
 516 /******************/
 517 /* Buffer release */
 518 /******************/
 519
 520 /* These should be const, eventually */
 521 /* static struct qb_attr_code code_release_num = QB_CODE(0, 0, 3); */
 522 static struct qb_attr_code code_release_set_me = QB_CODE(0, 5, 1);
 523 static struct qb_attr_code code_release_bpid = QB_CODE(0, 16, 16);
 524
 525 void qbman_release_desc_clear(struct qbman_release_desc *d)
 526 {
 527         uint32_t *cl;
 528
 529         memset(d, 0, sizeof(*d));
 530         cl = qb_cl(d);
 531         qb_attr_code_encode(&code_release_set_me, cl, 1);
 532 }
 533
 534 void qbman_release_desc_set_bpid(struct qbman_release_desc *d, uint32_t bpid)
 535 {
 536         uint32_t *cl = qb_cl(d);
 537
 538         qb_attr_code_encode(&code_release_bpid, cl, bpid);
 539 }
 540
 541 #define RAR_IDX(rar)     ((rar) & 0x7)
 542 #define RAR_VB(rar)      ((rar) & 0x80)
 543 #define RAR_SUCCESS(rar) ((rar) & 0x100)
 544
 545 int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
 546                       const uint64_t *buffers, unsigned int num_buffers)
 547 {
 548         uint32_t *p;
 549         const uint32_t *cl = qb_cl(d);
 550         uint32_t rar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_RAR);
 551         debug("RAR=%08x\n", rar);
 552         if (!RAR_SUCCESS(rar))
 553                 return -EBUSY;
 554         BUG_ON(!num_buffers || (num_buffers > 7));
 555         /* Start the release command */
 556         p = qbman_cena_write_start(&s->sys,
 557                                    QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
 558         /* Copy the caller's buffer pointers to the command */
 559         u64_to_le32_copy(&p[2], buffers, num_buffers);
 560         lwsync();
 561         /* Set the verb byte, have to substitute in the valid-bit and the number
 562          * of buffers. */
 563         p[0] = cl[0] | RAR_VB(rar) | num_buffers;
 564         qbman_cena_write_complete(&s->sys,
 565                                   QBMAN_CENA_SWP_RCR(RAR_IDX(rar)),
 566                                   p);
 567         return 0;
 568 }
 569
 570 /*******************/
 571 /* Buffer acquires */
 572 /*******************/
 573
 574 /* These should be const, eventually */
 575 static struct qb_attr_code code_acquire_bpid = QB_CODE(0, 16, 16);
 576 static struct qb_attr_code code_acquire_num = QB_CODE(1, 0, 3);
 577 static struct qb_attr_code code_acquire_r_num = QB_CODE(1, 0, 3);
 578
 579 int qbman_swp_acquire(struct qbman_swp *s, uint32_t bpid, uint64_t *buffers,
 580                       unsigned int num_buffers)
 581 {
 582         uint32_t *p;
 583         uint32_t verb, rslt, num;
 584
 585         BUG_ON(!num_buffers || (num_buffers > 7));
 586
 587         /* Start the management command */
 588         p = qbman_swp_mc_start(s);
 589
 590         if (!p)
 591                 return -EBUSY;
 592
 593         /* Encode the caller-provided attributes */
 594         qb_attr_code_encode(&code_acquire_bpid, p, bpid);
 595         qb_attr_code_encode(&code_acquire_num, p, num_buffers);
 596
 597         /* Complete the management command */
 598         p = qbman_swp_mc_complete(s, p, p[0] | QBMAN_MC_ACQUIRE);
 599
 600         /* Decode the outcome */
 601         verb = qb_attr_code_decode(&code_generic_verb, p);
 602         rslt = qb_attr_code_decode(&code_generic_rslt, p);
 603         num = qb_attr_code_decode(&code_acquire_r_num, p);
 604         BUG_ON(verb != QBMAN_MC_ACQUIRE);
 605
 606         /* Determine success or failure */
 607         if (unlikely(rslt != QBMAN_MC_RSLT_OK)) {
 608                 printf("Acquire buffers from BPID 0x%x failed, code=0x%02x\n",
 609                        bpid, rslt);
 610                 return -EIO;
 611         }
 612         BUG_ON(num > num_buffers);
 613         /* Copy the acquired buffers to the caller's array */
 614         u64_from_le32_copy(buffers, &p[2], num);
 615         return (int)num;
 616 }