1 /* 2 * Renesas R-Car SRC support 3 * 4 * Copyright (C) 2013 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include "rsnd.h" 12 13 #define SRC_NAME "src" 14 15 /* SRCx_STATUS */ 16 #define OUF_SRCO ((1 << 12) | (1 << 13)) 17 #define OUF_SRCI ((1 << 9) | (1 << 8)) 18 19 /* SCU_SYSTEM_STATUS0/1 */ 20 #define OUF_SRC(id) ((1 << (id + 16)) | (1 << id)) 21 22 struct rsnd_src { 23 struct rsnd_mod mod; 24 struct rsnd_mod *dma; 25 struct rsnd_kctrl_cfg_s sen; /* sync convert enable */ 26 struct rsnd_kctrl_cfg_s sync; /* sync convert */ 27 u32 convert_rate; /* sampling rate convert */ 28 int irq; 29 }; 30 31 #define RSND_SRC_NAME_SIZE 16 32 33 #define rsnd_src_get(priv, id) ((struct rsnd_src *)(priv->src) + id) 34 #define rsnd_src_to_dma(src) ((src)->dma) 35 #define rsnd_src_nr(priv) ((priv)->src_nr) 36 #define rsnd_src_sync_is_enabled(mod) (rsnd_mod_to_src(mod)->sen.val) 37 38 #define rsnd_mod_to_src(_mod) \ 39 container_of((_mod), struct rsnd_src, mod) 40 41 #define for_each_rsnd_src(pos, priv, i) \ 42 for ((i) = 0; \ 43 ((i) < rsnd_src_nr(priv)) && \ 44 ((pos) = (struct rsnd_src *)(priv)->src + i); \ 45 i++) 46 47 48 /* 49 * image of SRC (Sampling Rate Converter) 50 * 51 * 96kHz <-> +-----+ 48kHz +-----+ 48kHz +-------+ 52 * 48kHz <-> | SRC | <------> | SSI | <-----> | codec | 53 * 44.1kHz <-> +-----+ +-----+ +-------+ 54 * ... 55 * 56 */ 57 58 /* 59 * src.c is caring... 60 * 61 * Gen1 62 * 63 * [mem] -> [SRU] -> [SSI] 64 * |--------| 65 * 66 * Gen2 67 * 68 * [mem] -> [SRC] -> [SSIU] -> [SSI] 69 * |-----------------| 70 */ 71 72 static void rsnd_src_activation(struct rsnd_mod *mod) 73 { 74 rsnd_mod_write(mod, SRC_SWRSR, 0); 75 rsnd_mod_write(mod, SRC_SWRSR, 1); 76 } 77 78 static void rsnd_src_halt(struct rsnd_mod *mod) 79 { 80 rsnd_mod_write(mod, SRC_SRCIR, 1); 81 rsnd_mod_write(mod, SRC_SWRSR, 0); 82 } 83 84 static struct dma_chan *rsnd_src_dma_req(struct rsnd_dai_stream *io, 85 struct rsnd_mod *mod) 86 { 87 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 88 int is_play = rsnd_io_is_play(io); 89 90 return rsnd_dma_request_channel(rsnd_src_of_node(priv), 91 mod, 92 is_play ? "rx" : "tx"); 93 } 94 95 static u32 rsnd_src_convert_rate(struct rsnd_dai_stream *io, 96 struct rsnd_mod *mod) 97 { 98 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 99 struct rsnd_src *src = rsnd_mod_to_src(mod); 100 u32 convert_rate; 101 102 if (!runtime) 103 return 0; 104 105 if (!rsnd_src_sync_is_enabled(mod)) 106 return src->convert_rate; 107 108 convert_rate = src->sync.val; 109 110 if (!convert_rate) 111 convert_rate = src->convert_rate; 112 113 if (!convert_rate) 114 convert_rate = runtime->rate; 115 116 return convert_rate; 117 } 118 119 unsigned int rsnd_src_get_rate(struct rsnd_priv *priv, 120 struct rsnd_dai_stream *io, 121 int is_in) 122 { 123 struct rsnd_mod *src_mod = rsnd_io_to_mod_src(io); 124 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 125 unsigned int rate = 0; 126 int is_play = rsnd_io_is_play(io); 127 128 /* 129 * 130 * Playback 131 * runtime_rate -> [SRC] -> convert_rate 132 * 133 * Capture 134 * convert_rate -> [SRC] -> runtime_rate 135 */ 136 137 if (is_play == is_in) 138 return runtime->rate; 139 140 /* 141 * return convert rate if SRC is used, 142 * otherwise, return runtime->rate as usual 143 */ 144 if (src_mod) 145 rate = rsnd_src_convert_rate(io, src_mod); 146 147 if (!rate) 148 rate = runtime->rate; 149 150 return rate; 151 } 152 153 static int rsnd_src_hw_params(struct rsnd_mod *mod, 154 struct rsnd_dai_stream *io, 155 struct snd_pcm_substream *substream, 156 struct snd_pcm_hw_params *fe_params) 157 { 158 struct rsnd_src *src = rsnd_mod_to_src(mod); 159 struct snd_soc_pcm_runtime *fe = substream->private_data; 160 161 /* 162 * SRC assumes that it is used under DPCM if user want to use 163 * sampling rate convert. Then, SRC should be FE. 164 * And then, this function will be called *after* BE settings. 165 * this means, each BE already has fixuped hw_params. 166 * see 167 * dpcm_fe_dai_hw_params() 168 * dpcm_be_dai_hw_params() 169 */ 170 if (fe->dai_link->dynamic) { 171 int stream = substream->stream; 172 struct snd_soc_dpcm *dpcm; 173 struct snd_pcm_hw_params *be_params; 174 175 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 176 be_params = &dpcm->hw_params; 177 178 if (params_rate(fe_params) != params_rate(be_params)) 179 src->convert_rate = params_rate(be_params); 180 } 181 } 182 183 return 0; 184 } 185 186 static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io, 187 struct rsnd_mod *mod) 188 { 189 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 190 struct device *dev = rsnd_priv_to_dev(priv); 191 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 192 int use_src = 0; 193 u32 fin, fout; 194 u32 ifscr, fsrate, adinr; 195 u32 cr, route; 196 u32 bsdsr, bsisr; 197 uint ratio; 198 199 if (!runtime) 200 return; 201 202 fin = rsnd_src_get_in_rate(priv, io); 203 fout = rsnd_src_get_out_rate(priv, io); 204 205 /* 6 - 1/6 are very enough ratio for SRC_BSDSR */ 206 if (fin == fout) 207 ratio = 0; 208 else if (fin > fout) 209 ratio = 100 * fin / fout; 210 else 211 ratio = 100 * fout / fin; 212 213 if (ratio > 600) { 214 dev_err(dev, "FSO/FSI ratio error\n"); 215 return; 216 } 217 218 use_src = (fin != fout) | rsnd_src_sync_is_enabled(mod); 219 220 /* 221 * SRC_ADINR 222 */ 223 adinr = rsnd_get_adinr_bit(mod, io) | 224 rsnd_runtime_channel_original(io); 225 226 /* 227 * SRC_IFSCR / SRC_IFSVR 228 */ 229 ifscr = 0; 230 fsrate = 0; 231 if (use_src) { 232 u64 n; 233 234 ifscr = 1; 235 n = (u64)0x0400000 * fin; 236 do_div(n, fout); 237 fsrate = n; 238 } 239 240 /* 241 * SRC_SRCCR / SRC_ROUTE_MODE0 242 */ 243 cr = 0x00011110; 244 route = 0x0; 245 if (use_src) { 246 route = 0x1; 247 248 if (rsnd_src_sync_is_enabled(mod)) { 249 cr |= 0x1; 250 route |= rsnd_io_is_play(io) ? 251 (0x1 << 24) : (0x1 << 25); 252 } 253 } 254 255 /* 256 * SRC_BSDSR / SRC_BSISR 257 */ 258 switch (rsnd_mod_id(mod)) { 259 case 5: 260 case 6: 261 case 7: 262 case 8: 263 bsdsr = 0x02400000; /* 6 - 1/6 */ 264 bsisr = 0x00100060; /* 6 - 1/6 */ 265 break; 266 default: 267 bsdsr = 0x01800000; /* 6 - 1/6 */ 268 bsisr = 0x00100060 ;/* 6 - 1/6 */ 269 break; 270 } 271 272 rsnd_mod_write(mod, SRC_ROUTE_MODE0, route); 273 274 rsnd_mod_write(mod, SRC_SRCIR, 1); /* initialize */ 275 rsnd_mod_write(mod, SRC_ADINR, adinr); 276 rsnd_mod_write(mod, SRC_IFSCR, ifscr); 277 rsnd_mod_write(mod, SRC_IFSVR, fsrate); 278 rsnd_mod_write(mod, SRC_SRCCR, cr); 279 rsnd_mod_write(mod, SRC_BSDSR, bsdsr); 280 rsnd_mod_write(mod, SRC_BSISR, bsisr); 281 rsnd_mod_write(mod, SRC_SRCIR, 0); /* cancel initialize */ 282 283 rsnd_mod_write(mod, SRC_I_BUSIF_MODE, 1); 284 rsnd_mod_write(mod, SRC_O_BUSIF_MODE, 1); 285 rsnd_mod_write(mod, SRC_BUSIF_DALIGN, rsnd_get_dalign(mod, io)); 286 287 rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout); 288 } 289 290 static int rsnd_src_irq(struct rsnd_mod *mod, 291 struct rsnd_dai_stream *io, 292 struct rsnd_priv *priv, 293 int enable) 294 { 295 struct rsnd_src *src = rsnd_mod_to_src(mod); 296 u32 sys_int_val, int_val, sys_int_mask; 297 int irq = src->irq; 298 int id = rsnd_mod_id(mod); 299 300 sys_int_val = 301 sys_int_mask = OUF_SRC(id); 302 int_val = 0x3300; 303 304 /* 305 * IRQ is not supported on non-DT 306 * see 307 * rsnd_src_probe_() 308 */ 309 if ((irq <= 0) || !enable) { 310 sys_int_val = 0; 311 int_val = 0; 312 } 313 314 /* 315 * WORKAROUND 316 * 317 * ignore over flow error when rsnd_src_sync_is_enabled() 318 */ 319 if (rsnd_src_sync_is_enabled(mod)) 320 sys_int_val = sys_int_val & 0xffff; 321 322 rsnd_mod_write(mod, SRC_INT_ENABLE0, int_val); 323 rsnd_mod_bset(mod, SCU_SYS_INT_EN0, sys_int_mask, sys_int_val); 324 rsnd_mod_bset(mod, SCU_SYS_INT_EN1, sys_int_mask, sys_int_val); 325 326 return 0; 327 } 328 329 static void rsnd_src_status_clear(struct rsnd_mod *mod) 330 { 331 u32 val = OUF_SRC(rsnd_mod_id(mod)); 332 333 rsnd_mod_write(mod, SCU_SYS_STATUS0, val); 334 rsnd_mod_write(mod, SCU_SYS_STATUS1, val); 335 } 336 337 static bool rsnd_src_error_occurred(struct rsnd_mod *mod) 338 { 339 u32 val0, val1; 340 bool ret = false; 341 342 val0 = val1 = OUF_SRC(rsnd_mod_id(mod)); 343 344 /* 345 * WORKAROUND 346 * 347 * ignore over flow error when rsnd_src_sync_is_enabled() 348 */ 349 if (rsnd_src_sync_is_enabled(mod)) 350 val0 = val0 & 0xffff; 351 352 if ((rsnd_mod_read(mod, SCU_SYS_STATUS0) & val0) || 353 (rsnd_mod_read(mod, SCU_SYS_STATUS1) & val1)) 354 ret = true; 355 356 return ret; 357 } 358 359 static int rsnd_src_start(struct rsnd_mod *mod, 360 struct rsnd_dai_stream *io, 361 struct rsnd_priv *priv) 362 { 363 u32 val; 364 365 /* 366 * WORKAROUND 367 * 368 * Enable SRC output if you want to use sync convert together with DVC 369 */ 370 val = (rsnd_io_to_mod_dvc(io) && !rsnd_src_sync_is_enabled(mod)) ? 371 0x01 : 0x11; 372 373 rsnd_mod_write(mod, SRC_CTRL, val); 374 375 return 0; 376 } 377 378 static int rsnd_src_stop(struct rsnd_mod *mod, 379 struct rsnd_dai_stream *io, 380 struct rsnd_priv *priv) 381 { 382 rsnd_mod_write(mod, SRC_CTRL, 0); 383 384 return 0; 385 } 386 387 static int rsnd_src_init(struct rsnd_mod *mod, 388 struct rsnd_dai_stream *io, 389 struct rsnd_priv *priv) 390 { 391 struct rsnd_src *src = rsnd_mod_to_src(mod); 392 393 rsnd_mod_power_on(mod); 394 395 rsnd_src_activation(mod); 396 397 rsnd_src_set_convert_rate(io, mod); 398 399 rsnd_src_status_clear(mod); 400 401 /* reset sync convert_rate */ 402 src->sync.val = 0; 403 404 return 0; 405 } 406 407 static int rsnd_src_quit(struct rsnd_mod *mod, 408 struct rsnd_dai_stream *io, 409 struct rsnd_priv *priv) 410 { 411 struct rsnd_src *src = rsnd_mod_to_src(mod); 412 413 rsnd_src_halt(mod); 414 415 rsnd_mod_power_off(mod); 416 417 src->convert_rate = 0; 418 419 /* reset sync convert_rate */ 420 src->sync.val = 0; 421 422 return 0; 423 } 424 425 static void __rsnd_src_interrupt(struct rsnd_mod *mod, 426 struct rsnd_dai_stream *io) 427 { 428 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 429 bool stop = false; 430 431 spin_lock(&priv->lock); 432 433 /* ignore all cases if not working */ 434 if (!rsnd_io_is_working(io)) 435 goto rsnd_src_interrupt_out; 436 437 if (rsnd_src_error_occurred(mod)) 438 stop = true; 439 440 rsnd_src_status_clear(mod); 441 rsnd_src_interrupt_out: 442 443 spin_unlock(&priv->lock); 444 445 if (stop) 446 snd_pcm_stop_xrun(io->substream); 447 } 448 449 static irqreturn_t rsnd_src_interrupt(int irq, void *data) 450 { 451 struct rsnd_mod *mod = data; 452 453 rsnd_mod_interrupt(mod, __rsnd_src_interrupt); 454 455 return IRQ_HANDLED; 456 } 457 458 static int rsnd_src_probe_(struct rsnd_mod *mod, 459 struct rsnd_dai_stream *io, 460 struct rsnd_priv *priv) 461 { 462 struct rsnd_src *src = rsnd_mod_to_src(mod); 463 struct device *dev = rsnd_priv_to_dev(priv); 464 int irq = src->irq; 465 int ret; 466 467 if (irq > 0) { 468 /* 469 * IRQ is not supported on non-DT 470 * see 471 * rsnd_src_irq() 472 */ 473 ret = devm_request_irq(dev, irq, 474 rsnd_src_interrupt, 475 IRQF_SHARED, 476 dev_name(dev), mod); 477 if (ret) 478 return ret; 479 } 480 481 ret = rsnd_dma_attach(io, mod, &src->dma); 482 483 return ret; 484 } 485 486 static int rsnd_src_pcm_new(struct rsnd_mod *mod, 487 struct rsnd_dai_stream *io, 488 struct snd_soc_pcm_runtime *rtd) 489 { 490 struct rsnd_src *src = rsnd_mod_to_src(mod); 491 int ret; 492 493 /* 494 * enable SRC sync convert if possible 495 */ 496 497 /* 498 * It can't use SRC Synchronous convert 499 * when Capture if it uses CMD 500 */ 501 if (rsnd_io_to_mod_cmd(io) && !rsnd_io_is_play(io)) 502 return 0; 503 504 /* 505 * enable sync convert 506 */ 507 ret = rsnd_kctrl_new_s(mod, io, rtd, 508 rsnd_io_is_play(io) ? 509 "SRC Out Rate Switch" : 510 "SRC In Rate Switch", 511 rsnd_src_set_convert_rate, 512 &src->sen, 1); 513 if (ret < 0) 514 return ret; 515 516 ret = rsnd_kctrl_new_s(mod, io, rtd, 517 rsnd_io_is_play(io) ? 518 "SRC Out Rate" : 519 "SRC In Rate", 520 rsnd_src_set_convert_rate, 521 &src->sync, 192000); 522 523 return ret; 524 } 525 526 static struct rsnd_mod_ops rsnd_src_ops = { 527 .name = SRC_NAME, 528 .dma_req = rsnd_src_dma_req, 529 .probe = rsnd_src_probe_, 530 .init = rsnd_src_init, 531 .quit = rsnd_src_quit, 532 .start = rsnd_src_start, 533 .stop = rsnd_src_stop, 534 .irq = rsnd_src_irq, 535 .hw_params = rsnd_src_hw_params, 536 .pcm_new = rsnd_src_pcm_new, 537 }; 538 539 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id) 540 { 541 if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv))) 542 id = 0; 543 544 return rsnd_mod_get(rsnd_src_get(priv, id)); 545 } 546 547 int rsnd_src_probe(struct rsnd_priv *priv) 548 { 549 struct device_node *node; 550 struct device_node *np; 551 struct device *dev = rsnd_priv_to_dev(priv); 552 struct rsnd_src *src; 553 struct clk *clk; 554 char name[RSND_SRC_NAME_SIZE]; 555 int i, nr, ret; 556 557 /* This driver doesn't support Gen1 at this point */ 558 if (rsnd_is_gen1(priv)) 559 return 0; 560 561 node = rsnd_src_of_node(priv); 562 if (!node) 563 return 0; /* not used is not error */ 564 565 nr = of_get_child_count(node); 566 if (!nr) { 567 ret = -EINVAL; 568 goto rsnd_src_probe_done; 569 } 570 571 src = devm_kzalloc(dev, sizeof(*src) * nr, GFP_KERNEL); 572 if (!src) { 573 ret = -ENOMEM; 574 goto rsnd_src_probe_done; 575 } 576 577 priv->src_nr = nr; 578 priv->src = src; 579 580 i = 0; 581 for_each_child_of_node(node, np) { 582 if (!of_device_is_available(np)) 583 goto skip; 584 585 src = rsnd_src_get(priv, i); 586 587 snprintf(name, RSND_SRC_NAME_SIZE, "%s.%d", 588 SRC_NAME, i); 589 590 src->irq = irq_of_parse_and_map(np, 0); 591 if (!src->irq) { 592 ret = -EINVAL; 593 goto rsnd_src_probe_done; 594 } 595 596 clk = devm_clk_get(dev, name); 597 if (IS_ERR(clk)) { 598 ret = PTR_ERR(clk); 599 goto rsnd_src_probe_done; 600 } 601 602 ret = rsnd_mod_init(priv, rsnd_mod_get(src), 603 &rsnd_src_ops, clk, rsnd_mod_get_status, 604 RSND_MOD_SRC, i); 605 if (ret) 606 goto rsnd_src_probe_done; 607 608 skip: 609 i++; 610 } 611 612 ret = 0; 613 614 rsnd_src_probe_done: 615 of_node_put(node); 616 617 return ret; 618 } 619 620 void rsnd_src_remove(struct rsnd_priv *priv) 621 { 622 struct rsnd_src *src; 623 int i; 624 625 for_each_rsnd_src(src, priv, i) { 626 rsnd_mod_quit(rsnd_mod_get(src)); 627 } 628 } 629