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 } 594