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 = kmalloc(sizeof(*p), GFP_KERNEL);
  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         p->vdq.busy = 0; /* TODO: convert to atomic_t */
  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 static struct qb_attr_code code_eq_rsp_hi = QB_CODE(7, 0, 32);
 169
 170 enum qbman_eq_cmd_e {
 171         /* No enqueue, primarily for plugging ORP gaps for dropped frames */
 172         qbman_eq_cmd_empty,
 173         /* DMA an enqueue response once complete */
 174         qbman_eq_cmd_respond,
 175         /* DMA an enqueue response only if the enqueue fails */
 176         qbman_eq_cmd_respond_reject
 177 };
 178
 179 void qbman_eq_desc_clear(struct qbman_eq_desc *d)
 180 {
 181         memset(d, 0, sizeof(*d));
 182 }
 183
 184 void qbman_eq_desc_set_no_orp(struct qbman_eq_desc *d, int respond_success)
 185 {
 186         uint32_t *cl = qb_cl(d);
 187
 188         qb_attr_code_encode(&code_eq_orp_en, cl, 0);
 189         qb_attr_code_encode(&code_eq_cmd, cl,
 190                             respond_success ? qbman_eq_cmd_respond :
 191                                               qbman_eq_cmd_respond_reject);
 192 }
 193
 194 void qbman_eq_desc_set_response(struct qbman_eq_desc *d,
 195                                 dma_addr_t storage_phys,
 196                                 int stash)
 197 {
 198         uint32_t *cl = qb_cl(d);
 199
 200         qb_attr_code_encode(&code_eq_rsp_lo, cl, lower32(storage_phys));
 201         qb_attr_code_encode(&code_eq_rsp_hi, cl, upper32(storage_phys));
 202         qb_attr_code_encode(&code_eq_rsp_stash, cl, !!stash);
 203 }
 204
 205
 206 void qbman_eq_desc_set_qd(struct qbman_eq_desc *d, uint32_t qdid,
 207                           uint32_t qd_bin, uint32_t qd_prio)
 208 {
 209         uint32_t *cl = qb_cl(d);
 210
 211         qb_attr_code_encode(&code_eq_qd_en, cl, 1);
 212         qb_attr_code_encode(&code_eq_tgt_id, cl, qdid);
 213         qb_attr_code_encode(&code_eq_qd_bin, cl, qd_bin);
 214         qb_attr_code_encode(&code_eq_qd_pri, cl, qd_prio);
 215 }
 216
 217 #define EQAR_IDX(eqar)     ((eqar) & 0x7)
 218 #define EQAR_VB(eqar)      ((eqar) & 0x80)
 219 #define EQAR_SUCCESS(eqar) ((eqar) & 0x100)
 220
 221 int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
 222                       const struct qbman_fd *fd)
 223 {
 224         uint32_t *p;
 225         const uint32_t *cl = qb_cl(d);
 226         uint32_t eqar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_EQAR);
 227         debug("EQAR=%08x\n", eqar);
 228         if (!EQAR_SUCCESS(eqar))
 229                 return -EBUSY;
 230         p = qbman_cena_write_start(&s->sys,
 231                                    QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)));
 232         word_copy(&p[1], &cl[1], 7);
 233         word_copy(&p[8], fd, sizeof(*fd) >> 2);
 234         lwsync();
 235         /* Set the verb byte, have to substitute in the valid-bit */
 236         p[0] = cl[0] | EQAR_VB(eqar);
 237         qbman_cena_write_complete(&s->sys,
 238                                   QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)),
 239                                   p);
 240         return 0;
 241 }
 242
 243 /***************************/
 244 /* Volatile (pull) dequeue */
 245 /***************************/
 246
 247 /* These should be const, eventually */
 248 static struct qb_attr_code code_pull_dct = QB_CODE(0, 0, 2);
 249 static struct qb_attr_code code_pull_dt = QB_CODE(0, 2, 2);
 250 static struct qb_attr_code code_pull_rls = QB_CODE(0, 4, 1);
 251 static struct qb_attr_code code_pull_stash = QB_CODE(0, 5, 1);
 252 static struct qb_attr_code code_pull_numframes = QB_CODE(0, 8, 4);
 253 static struct qb_attr_code code_pull_token = QB_CODE(0, 16, 8);
 254 static struct qb_attr_code code_pull_dqsource = QB_CODE(1, 0, 24);
 255 static struct qb_attr_code code_pull_rsp_lo = QB_CODE(2, 0, 32);
 256 static struct qb_attr_code code_pull_rsp_hi = QB_CODE(3, 0, 32);
 257
 258 enum qb_pull_dt_e {
 259         qb_pull_dt_channel,
 260         qb_pull_dt_workqueue,
 261         qb_pull_dt_framequeue
 262 };
 263
 264 void qbman_pull_desc_clear(struct qbman_pull_desc *d)
 265 {
 266         memset(d, 0, sizeof(*d));
 267 }
 268
 269 void qbman_pull_desc_set_storage(struct qbman_pull_desc *d,
 270                                  struct ldpaa_dq *storage,
 271                                  dma_addr_t storage_phys,
 272                                  int stash)
 273 {
 274         uint32_t *cl = qb_cl(d);
 275
 276         /* Squiggle the pointer 'storage' into the extra 2 words of the
 277          * descriptor (which aren't copied to the hw command) */
 278         *(void **)&cl[4] = storage;
 279         if (!storage) {
 280                 qb_attr_code_encode(&code_pull_rls, cl, 0);
 281                 return;
 282         }
 283         qb_attr_code_encode(&code_pull_rls, cl, 1);
 284         qb_attr_code_encode(&code_pull_stash, cl, !!stash);
 285         qb_attr_code_encode(&code_pull_rsp_lo, cl, lower32(storage_phys));
 286         qb_attr_code_encode(&code_pull_rsp_hi, cl, upper32(storage_phys));
 287 }
 288
 289 void qbman_pull_desc_set_numframes(struct qbman_pull_desc *d, uint8_t numframes)
 290 {
 291         uint32_t *cl = qb_cl(d);
 292
 293         BUG_ON(!numframes || (numframes > 16));
 294         qb_attr_code_encode(&code_pull_numframes, cl,
 295                             (uint32_t)(numframes - 1));
 296 }
 297
 298 void qbman_pull_desc_set_token(struct qbman_pull_desc *d, uint8_t token)
 299 {
 300         uint32_t *cl = qb_cl(d);
 301
 302         qb_attr_code_encode(&code_pull_token, cl, token);
 303 }
 304
 305 void qbman_pull_desc_set_fq(struct qbman_pull_desc *d, uint32_t fqid)
 306 {
 307         uint32_t *cl = qb_cl(d);
 308
 309         qb_attr_code_encode(&code_pull_dct, cl, 1);
 310         qb_attr_code_encode(&code_pull_dt, cl, qb_pull_dt_framequeue);
 311         qb_attr_code_encode(&code_pull_dqsource, cl, fqid);
 312 }
 313
 314 int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 315 {
 316         uint32_t *p;
 317         uint32_t *cl = qb_cl(d);
 318
 319         /* TODO: convert to atomic_t */
 320         if (s->vdq.busy)
 321                 return -EBUSY;
 322         s->vdq.busy = 1;
 323         s->vdq.storage = *(void **)&cl[4];
 324         s->vdq.token = qb_attr_code_decode(&code_pull_token, cl);
 325         p = qbman_cena_write_start(&s->sys, QBMAN_CENA_SWP_VDQCR);
 326         word_copy(&p[1], &cl[1], 3);
 327         lwsync();
 328         /* Set the verb byte, have to substitute in the valid-bit */
 329         p[0] = cl[0] | s->vdq.valid_bit;
 330         s->vdq.valid_bit ^= QB_VALID_BIT;
 331         qbman_cena_write_complete(&s->sys, QBMAN_CENA_SWP_VDQCR, p);
 332         return 0;
 333 }
 334
 335 /****************/
 336 /* Polling DQRR */
 337 /****************/
 338
 339 static struct qb_attr_code code_dqrr_verb = QB_CODE(0, 0, 8);
 340 static struct qb_attr_code code_dqrr_response = QB_CODE(0, 0, 7);
 341 static struct qb_attr_code code_dqrr_stat = QB_CODE(0, 8, 8);
 342
 343 #define QBMAN_DQRR_RESPONSE_DQ        0x60
 344 #define QBMAN_DQRR_RESPONSE_FQRN      0x21
 345 #define QBMAN_DQRR_RESPONSE_FQRNI     0x22
 346 #define QBMAN_DQRR_RESPONSE_FQPN      0x24
 347 #define QBMAN_DQRR_RESPONSE_FQDAN     0x25
 348 #define QBMAN_DQRR_RESPONSE_CDAN      0x26
 349 #define QBMAN_DQRR_RESPONSE_CSCN_MEM  0x27
 350 #define QBMAN_DQRR_RESPONSE_CGCU      0x28
 351 #define QBMAN_DQRR_RESPONSE_BPSCN     0x29
 352 #define QBMAN_DQRR_RESPONSE_CSCN_WQ   0x2a
 353
 354
 355 /* NULL return if there are no unconsumed DQRR entries. Returns a DQRR entry
 356  * only once, so repeated calls can return a sequence of DQRR entries, without
 357  * requiring they be consumed immediately or in any particular order. */
 358 const struct ldpaa_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
 359 {
 360         uint32_t verb;
 361         uint32_t response_verb;
 362         const struct ldpaa_dq *dq = qbman_cena_read(&s->sys,
 363                                         QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 364         const uint32_t *p = qb_cl(dq);
 365
 366         verb = qb_attr_code_decode(&code_dqrr_verb, p);
 367         /* If the valid-bit isn't of the expected polarity, nothing there */
 368         if ((verb & QB_VALID_BIT) != s->dqrr.valid_bit) {
 369                 qbman_cena_invalidate_prefetch(&s->sys,
 370                                                QBMAN_CENA_SWP_DQRR(
 371                                                s->dqrr.next_idx));
 372                 return NULL;
 373         }
 374         /* There's something there. Move "next_idx" attention to the next ring
 375          * entry (and prefetch it) before returning what we found. */
 376         s->dqrr.next_idx++;
 377         s->dqrr.next_idx &= 3; /* Wrap around at 4 */
 378         /* TODO: it's possible to do all this without conditionals, optimise it
 379          * later. */
 380         if (!s->dqrr.next_idx)
 381                 s->dqrr.valid_bit ^= QB_VALID_BIT;
 382         /* VDQCR "no longer busy" hook - if VDQCR shows "busy" and this is a
 383          * VDQCR result, mark it as non-busy. */
 384         if (s->vdq.busy) {
 385                 uint32_t flags = ldpaa_dq_flags(dq);
 386
 387                 response_verb = qb_attr_code_decode(&code_dqrr_response, &verb);
 388                 if ((response_verb == QBMAN_DQRR_RESPONSE_DQ) &&
 389                     (flags & LDPAA_DQ_STAT_VOLATILE))
 390                         s->vdq.busy = 0;
 391         }
 392         qbman_cena_invalidate_prefetch(&s->sys,
 393                                        QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
 394         return dq;
 395 }
 396
 397 /* Consume DQRR entries previously returned from qbman_swp_dqrr_next(). */
 398 void qbman_swp_dqrr_consume(struct qbman_swp *s, const struct ldpaa_dq *dq)
 399 {
 400         qbman_cinh_write(&s->sys, QBMAN_CINH_SWP_DCAP, QBMAN_IDX_FROM_DQRR(dq));
 401 }
 402
 403 /*********************************/
 404 /* Polling user-provided storage */
 405 /*********************************/
 406
 407 void qbman_dq_entry_set_oldtoken(struct ldpaa_dq *dq,
 408                                  unsigned int num_entries,
 409                                  uint8_t oldtoken)
 410 {
 411         memset(dq, oldtoken, num_entries * sizeof(*dq));
 412 }
 413
 414 int qbman_dq_entry_has_newtoken(struct qbman_swp *s,
 415                                 const struct ldpaa_dq *dq,
 416                                 uint8_t newtoken)
 417 {
 418         /* To avoid converting the little-endian DQ entry to host-endian prior
 419          * to us knowing whether there is a valid entry or not (and run the
 420          * risk of corrupting the incoming hardware LE write), we detect in
 421          * hardware endianness rather than host. This means we need a different
 422          * "code" depending on whether we are BE or LE in software, which is
 423          * where DQRR_TOK_OFFSET comes in... */
 424         static struct qb_attr_code code_dqrr_tok_detect =
 425                                         QB_CODE(0, DQRR_TOK_OFFSET, 8);
 426         /* The user trying to poll for a result treats "dq" as const. It is
 427          * however the same address that was provided to us non-const in the
 428          * first place, for directing hardware DMA to. So we can cast away the
 429          * const because it is mutable from our perspective. */
 430         uint32_t *p = qb_cl((struct ldpaa_dq *)dq);
 431         uint32_t token;
 432
 433         token = qb_attr_code_decode(&code_dqrr_tok_detect, &p[1]);
 434         if (token != newtoken)
 435                 return 0;
 436
 437         /* Only now do we convert from hardware to host endianness. Also, as we
 438          * are returning success, the user has promised not to call us again, so
 439          * there's no risk of us converting the endianness twice... */
 440         make_le32_n(p, 16);
 441
 442         /* VDQCR "no longer busy" hook - not quite the same as DQRR, because the
 443          * fact "VDQCR" shows busy doesn't mean that the result we're looking at
 444          * is from the same command. Eg. we may be looking at our 10th dequeue
 445          * result from our first VDQCR command, yet the second dequeue command
 446          * could have been kicked off already, after seeing the 1st result. Ie.
 447          * the result we're looking at is not necessarily proof that we can
 448          * reset "busy".  We instead base the decision on whether the current
 449          * result is sitting at the first 'storage' location of the busy
 450          * command. */
 451         if (s->vdq.busy && (s->vdq.storage == dq))
 452                 s->vdq.busy = 0;
 453         return 1;
 454 }
 455
 456 /********************************/
 457 /* Categorising dequeue entries */
 458 /********************************/
 459
 460 static inline int __qbman_dq_entry_is_x(const struct ldpaa_dq *dq, uint32_t x)
 461 {
 462         const uint32_t *p = qb_cl(dq);
 463         uint32_t response_verb = qb_attr_code_decode(&code_dqrr_response, p);
 464
 465         return response_verb == x;
 466 }
 467
 468 int qbman_dq_entry_is_DQ(const struct ldpaa_dq *dq)
 469 {
 470         return __qbman_dq_entry_is_x(dq, QBMAN_DQRR_RESPONSE_DQ);
 471 }
 472
 473 /*********************************/
 474 /* Parsing frame dequeue results */
 475 /*********************************/
 476
 477 /* These APIs assume qbman_dq_entry_is_DQ() is TRUE */
 478
 479 uint32_t ldpaa_dq_flags(const struct ldpaa_dq *dq)
 480 {
 481         const uint32_t *p = qb_cl(dq);
 482
 483         return qb_attr_code_decode(&code_dqrr_stat, p);
 484 }
 485
 486 const struct dpaa_fd *ldpaa_dq_fd(const struct ldpaa_dq *dq)
 487 {
 488         const uint32_t *p = qb_cl(dq);
 489
 490         return (const struct dpaa_fd *)&p[8];
 491 }
 492
 493 /******************/
 494 /* Buffer release */
 495 /******************/
 496
 497 /* These should be const, eventually */
 498 /* static struct qb_attr_code code_release_num = QB_CODE(0, 0, 3); */
 499 static struct qb_attr_code code_release_set_me = QB_CODE(0, 5, 1);
 500 static struct qb_attr_code code_release_bpid = QB_CODE(0, 16, 16);
 501
 502 void qbman_release_desc_clear(struct qbman_release_desc *d)
 503 {
 504         uint32_t *cl;
 505
 506         memset(d, 0, sizeof(*d));
 507         cl = qb_cl(d);
 508         qb_attr_code_encode(&code_release_set_me, cl, 1);
 509 }
 510
 511 void qbman_release_desc_set_bpid(struct qbman_release_desc *d, uint32_t bpid)
 512 {
 513         uint32_t *cl = qb_cl(d);
 514
 515         qb_attr_code_encode(&code_release_bpid, cl, bpid);
 516 }
 517
 518 #define RAR_IDX(rar)     ((rar) & 0x7)
 519 #define RAR_VB(rar)      ((rar) & 0x80)
 520 #define RAR_SUCCESS(rar) ((rar) & 0x100)
 521
 522 int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
 523                       const uint64_t *buffers, unsigned int num_buffers)
 524 {
 525         uint32_t *p;
 526         const uint32_t *cl = qb_cl(d);
 527         uint32_t rar = qbman_cinh_read(&s->sys, QBMAN_CINH_SWP_RAR);
 528         debug("RAR=%08x\n", rar);
 529         if (!RAR_SUCCESS(rar))
 530                 return -EBUSY;
 531         BUG_ON(!num_buffers || (num_buffers > 7));
 532         /* Start the release command */
 533         p = qbman_cena_write_start(&s->sys,
 534                                    QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
 535         /* Copy the caller's buffer pointers to the command */
 536         u64_to_le32_copy(&p[2], buffers, num_buffers);
 537         lwsync();
 538         /* Set the verb byte, have to substitute in the valid-bit and the number
 539          * of buffers. */
 540         p[0] = cl[0] | RAR_VB(rar) | num_buffers;
 541         qbman_cena_write_complete(&s->sys,
 542                                   QBMAN_CENA_SWP_RCR(RAR_IDX(rar)),
 543                                   p);
 544         return 0;
 545 }
 546
 547 /*******************/
 548 /* Buffer acquires */
 549 /*******************/
 550
 551 /* These should be const, eventually */
 552 static struct qb_attr_code code_acquire_bpid = QB_CODE(0, 16, 16);
 553 static struct qb_attr_code code_acquire_num = QB_CODE(1, 0, 3);
 554 static struct qb_attr_code code_acquire_r_num = QB_CODE(1, 0, 3);
 555
 556 int qbman_swp_acquire(struct qbman_swp *s, uint32_t bpid, uint64_t *buffers,
 557                       unsigned int num_buffers)
 558 {
 559         uint32_t *p;
 560         uint32_t verb, rslt, num;
 561
 562         BUG_ON(!num_buffers || (num_buffers > 7));
 563
 564         /* Start the management command */
 565         p = qbman_swp_mc_start(s);
 566
 567         if (!p)
 568                 return -EBUSY;
 569
 570         /* Encode the caller-provided attributes */
 571         qb_attr_code_encode(&code_acquire_bpid, p, bpid);
 572         qb_attr_code_encode(&code_acquire_num, p, num_buffers);
 573
 574         /* Complete the management command */
 575         p = qbman_swp_mc_complete(s, p, p[0] | QBMAN_MC_ACQUIRE);
 576
 577         /* Decode the outcome */
 578         verb = qb_attr_code_decode(&code_generic_verb, p);
 579         rslt = qb_attr_code_decode(&code_generic_rslt, p);
 580         num = qb_attr_code_decode(&code_acquire_r_num, p);
 581         BUG_ON(verb != QBMAN_MC_ACQUIRE);
 582
 583         /* Determine success or failure */
 584         if (unlikely(rslt != QBMAN_MC_RSLT_OK)) {
 585                 printf("Acquire buffers from BPID 0x%x failed, code=0x%02x\n",
 586                        bpid, rslt);
 587                 return -EIO;
 588         }
 589         BUG_ON(num > num_buffers);
 590         /* Copy the acquired buffers to the caller's array */
 591         u64_from_le32_copy(buffers, &p[2], num);
 592         return (int)num;
 593 }