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 u32 fin, fout; 193 u32 ifscr, fsrate, adinr; 194 u32 cr, route; 195 u32 bsdsr, bsisr; 196 uint ratio; 197 198 if (!runtime) 199 return; 200 201 fin = rsnd_src_get_in_rate(priv, io); 202 fout = rsnd_src_get_out_rate(priv, io); 203 204 /* 6 - 1/6 are very enough ratio for SRC_BSDSR */ 205 if (fin == fout) 206 ratio = 0; 207 else if (fin > fout) 208 ratio = 100 * fin / fout; 209 else 210 ratio = 100 * fout / fin; 211 212 if (ratio > 600) { 213 dev_err(dev, "FSO/FSI ratio error\n"); 214 return; 215 } 216 217 /* 218 * SRC_ADINR 219 */ 220 adinr = rsnd_get_adinr_bit(mod, io) | 221 rsnd_runtime_channel_original(io); 222 223 /* 224 * SRC_IFSCR / SRC_IFSVR 225 */ 226 ifscr = 0; 227 fsrate = 0; 228 if (fin != fout) { 229 ifscr = 1; 230 fsrate = 0x0400000 / fout * fin; 231 } 232 233 /* 234 * SRC_SRCCR / SRC_ROUTE_MODE0 235 */ 236 cr = 0x00011110; 237 route = 0x0; 238 if (fin != fout) { 239 route = 0x1; 240 241 if (rsnd_src_sync_is_enabled(mod)) { 242 cr |= 0x1; 243 route |= rsnd_io_is_play(io) ? 244 (0x1 << 24) : (0x1 << 25); 245 } 246 } 247 248 /* 249 * SRC_BSDSR / SRC_BSISR 250 */ 251 switch (rsnd_mod_id(mod)) { 252 case 5: 253 case 6: 254 case 7: 255 case 8: 256 bsdsr = 0x02400000; /* 6 - 1/6 */ 257 bsisr = 0x00100060; /* 6 - 1/6 */ 258 break; 259 default: 260 bsdsr = 0x01800000; /* 6 - 1/6 */ 261 bsisr = 0x00100060 ;/* 6 - 1/6 */ 262 break; 263 } 264 265 rsnd_mod_write(mod, SRC_ROUTE_MODE0, route); 266 267 rsnd_mod_write(mod, SRC_SRCIR, 1); /* initialize */ 268 rsnd_mod_write(mod, SRC_ADINR, adinr); 269 rsnd_mod_write(mod, SRC_IFSCR, ifscr); 270 rsnd_mod_write(mod, SRC_IFSVR, fsrate); 271 rsnd_mod_write(mod, SRC_SRCCR, cr); 272 rsnd_mod_write(mod, SRC_BSDSR, bsdsr); 273 rsnd_mod_write(mod, SRC_BSISR, bsisr); 274 rsnd_mod_write(mod, SRC_SRCIR, 0); /* cancel initialize */ 275 276 rsnd_mod_write(mod, SRC_I_BUSIF_MODE, 1); 277 rsnd_mod_write(mod, SRC_O_BUSIF_MODE, 1); 278 rsnd_mod_write(mod, SRC_BUSIF_DALIGN, rsnd_get_dalign(mod, io)); 279 280 rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout); 281 } 282 283 static int rsnd_src_irq(struct rsnd_mod *mod, 284 struct rsnd_dai_stream *io, 285 struct rsnd_priv *priv, 286 int enable) 287 { 288 struct rsnd_src *src = rsnd_mod_to_src(mod); 289 u32 sys_int_val, int_val, sys_int_mask; 290 int irq = src->irq; 291 int id = rsnd_mod_id(mod); 292 293 sys_int_val = 294 sys_int_mask = OUF_SRC(id); 295 int_val = 0x3300; 296 297 /* 298 * IRQ is not supported on non-DT 299 * see 300 * rsnd_src_probe_() 301 */ 302 if ((irq <= 0) || !enable) { 303 sys_int_val = 0; 304 int_val = 0; 305 } 306 307 /* 308 * WORKAROUND 309 * 310 * ignore over flow error when rsnd_src_sync_is_enabled() 311 */ 312 if (rsnd_src_sync_is_enabled(mod)) 313 sys_int_val = sys_int_val & 0xffff; 314 315 rsnd_mod_write(mod, SRC_INT_ENABLE0, int_val); 316 rsnd_mod_bset(mod, SCU_SYS_INT_EN0, sys_int_mask, sys_int_val); 317 rsnd_mod_bset(mod, SCU_SYS_INT_EN1, sys_int_mask, sys_int_val); 318 319 return 0; 320 } 321 322 static void rsnd_src_status_clear(struct rsnd_mod *mod) 323 { 324 u32 val = OUF_SRC(rsnd_mod_id(mod)); 325 326 rsnd_mod_bset(mod, SCU_SYS_STATUS0, val, val); 327 rsnd_mod_bset(mod, SCU_SYS_STATUS1, val, val); 328 } 329 330 static bool rsnd_src_error_occurred(struct rsnd_mod *mod) 331 { 332 u32 val0, val1; 333 bool ret = false; 334 335 val0 = val1 = OUF_SRC(rsnd_mod_id(mod)); 336 337 /* 338 * WORKAROUND 339 * 340 * ignore over flow error when rsnd_src_sync_is_enabled() 341 */ 342 if (rsnd_src_sync_is_enabled(mod)) 343 val0 = val0 & 0xffff; 344 345 if ((rsnd_mod_read(mod, SCU_SYS_STATUS0) & val0) || 346 (rsnd_mod_read(mod, SCU_SYS_STATUS1) & val1)) 347 ret = true; 348 349 return ret; 350 } 351 352 static int rsnd_src_start(struct rsnd_mod *mod, 353 struct rsnd_dai_stream *io, 354 struct rsnd_priv *priv) 355 { 356 u32 val; 357 358 /* 359 * WORKAROUND 360 * 361 * Enable SRC output if you want to use sync convert together with DVC 362 */ 363 val = (rsnd_io_to_mod_dvc(io) && !rsnd_src_sync_is_enabled(mod)) ? 364 0x01 : 0x11; 365 366 rsnd_mod_write(mod, SRC_CTRL, val); 367 368 return 0; 369 } 370 371 static int rsnd_src_stop(struct rsnd_mod *mod, 372 struct rsnd_dai_stream *io, 373 struct rsnd_priv *priv) 374 { 375 rsnd_mod_write(mod, SRC_CTRL, 0); 376 377 return 0; 378 } 379 380 static int rsnd_src_init(struct rsnd_mod *mod, 381 struct rsnd_dai_stream *io, 382 struct rsnd_priv *priv) 383 { 384 struct rsnd_src *src = rsnd_mod_to_src(mod); 385 386 rsnd_mod_power_on(mod); 387 388 rsnd_src_activation(mod); 389 390 rsnd_src_set_convert_rate(io, mod); 391 392 rsnd_src_status_clear(mod); 393 394 /* reset sync convert_rate */ 395 src->sync.val = 0; 396 397 return 0; 398 } 399 400 static int rsnd_src_quit(struct rsnd_mod *mod, 401 struct rsnd_dai_stream *io, 402 struct rsnd_priv *priv) 403 { 404 struct rsnd_src *src = rsnd_mod_to_src(mod); 405 406 rsnd_src_halt(mod); 407 408 rsnd_mod_power_off(mod); 409 410 src->convert_rate = 0; 411 412 /* reset sync convert_rate */ 413 src->sync.val = 0; 414 415 return 0; 416 } 417 418 static void __rsnd_src_interrupt(struct rsnd_mod *mod, 419 struct rsnd_dai_stream *io) 420 { 421 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 422 bool stop = false; 423 424 spin_lock(&priv->lock); 425 426 /* ignore all cases if not working */ 427 if (!rsnd_io_is_working(io)) 428 goto rsnd_src_interrupt_out; 429 430 if (rsnd_src_error_occurred(mod)) 431 stop = true; 432 433 rsnd_src_status_clear(mod); 434 rsnd_src_interrupt_out: 435 436 spin_unlock(&priv->lock); 437 438 if (stop) 439 snd_pcm_stop_xrun(io->substream); 440 } 441 442 static irqreturn_t rsnd_src_interrupt(int irq, void *data) 443 { 444 struct rsnd_mod *mod = data; 445 446 rsnd_mod_interrupt(mod, __rsnd_src_interrupt); 447 448 return IRQ_HANDLED; 449 } 450 451 static int rsnd_src_probe_(struct rsnd_mod *mod, 452 struct rsnd_dai_stream *io, 453 struct rsnd_priv *priv) 454 { 455 struct rsnd_src *src = rsnd_mod_to_src(mod); 456 struct device *dev = rsnd_priv_to_dev(priv); 457 int irq = src->irq; 458 int ret; 459 460 if (irq > 0) { 461 /* 462 * IRQ is not supported on non-DT 463 * see 464 * rsnd_src_irq() 465 */ 466 ret = devm_request_irq(dev, irq, 467 rsnd_src_interrupt, 468 IRQF_SHARED, 469 dev_name(dev), mod); 470 if (ret) 471 return ret; 472 } 473 474 ret = rsnd_dma_attach(io, mod, &src->dma, 0); 475 476 return ret; 477 } 478 479 static int rsnd_src_pcm_new(struct rsnd_mod *mod, 480 struct rsnd_dai_stream *io, 481 struct snd_soc_pcm_runtime *rtd) 482 { 483 struct rsnd_src *src = rsnd_mod_to_src(mod); 484 int ret; 485 486 /* 487 * enable SRC sync convert if possible 488 */ 489 490 /* 491 * It can't use SRC Synchronous convert 492 * when Capture if it uses CMD 493 */ 494 if (rsnd_io_to_mod_cmd(io) && !rsnd_io_is_play(io)) 495 return 0; 496 497 /* 498 * enable sync convert 499 */ 500 ret = rsnd_kctrl_new_s(mod, io, rtd, 501 rsnd_io_is_play(io) ? 502 "SRC Out Rate Switch" : 503 "SRC In Rate Switch", 504 rsnd_src_set_convert_rate, 505 &src->sen, 1); 506 if (ret < 0) 507 return ret; 508 509 ret = rsnd_kctrl_new_s(mod, io, rtd, 510 rsnd_io_is_play(io) ? 511 "SRC Out Rate" : 512 "SRC In Rate", 513 rsnd_src_set_convert_rate, 514 &src->sync, 192000); 515 516 return ret; 517 } 518 519 static struct rsnd_mod_ops rsnd_src_ops = { 520 .name = SRC_NAME, 521 .dma_req = rsnd_src_dma_req, 522 .probe = rsnd_src_probe_, 523 .init = rsnd_src_init, 524 .quit = rsnd_src_quit, 525 .start = rsnd_src_start, 526 .stop = rsnd_src_stop, 527 .irq = rsnd_src_irq, 528 .hw_params = rsnd_src_hw_params, 529 .pcm_new = rsnd_src_pcm_new, 530 }; 531 532 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id) 533 { 534 if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv))) 535 id = 0; 536 537 return rsnd_mod_get(rsnd_src_get(priv, id)); 538 } 539 540 int rsnd_src_probe(struct rsnd_priv *priv) 541 { 542 struct device_node *node; 543 struct device_node *np; 544 struct device *dev = rsnd_priv_to_dev(priv); 545 struct rsnd_src *src; 546 struct clk *clk; 547 char name[RSND_SRC_NAME_SIZE]; 548 int i, nr, ret; 549 550 /* This driver doesn't support Gen1 at this point */ 551 if (rsnd_is_gen1(priv)) 552 return 0; 553 554 node = rsnd_src_of_node(priv); 555 if (!node) 556 return 0; /* not used is not error */ 557 558 nr = of_get_child_count(node); 559 if (!nr) { 560 ret = -EINVAL; 561 goto rsnd_src_probe_done; 562 } 563 564 src = devm_kzalloc(dev, sizeof(*src) * nr, GFP_KERNEL); 565 if (!src) { 566 ret = -ENOMEM; 567 goto rsnd_src_probe_done; 568 } 569 570 priv->src_nr = nr; 571 priv->src = src; 572 573 i = 0; 574 for_each_child_of_node(node, np) { 575 if (!of_device_is_available(np)) 576 goto skip; 577 578 src = rsnd_src_get(priv, i); 579 580 snprintf(name, RSND_SRC_NAME_SIZE, "%s.%d", 581 SRC_NAME, i); 582 583 src->irq = irq_of_parse_and_map(np, 0); 584 if (!src->irq) { 585 ret = -EINVAL; 586 goto rsnd_src_probe_done; 587 } 588 589 clk = devm_clk_get(dev, name); 590 if (IS_ERR(clk)) { 591 ret = PTR_ERR(clk); 592 goto rsnd_src_probe_done; 593 } 594 595 ret = rsnd_mod_init(priv, rsnd_mod_get(src), 596 &rsnd_src_ops, clk, rsnd_mod_get_status, 597 RSND_MOD_SRC, i); 598 if (ret) 599 goto rsnd_src_probe_done; 600 601 skip: 602 i++; 603 } 604 605 ret = 0; 606 607 rsnd_src_probe_done: 608 of_node_put(node); 609 610 return ret; 611 } 612 613 void rsnd_src_remove(struct rsnd_priv *priv) 614 { 615 struct rsnd_src *src; 616 int i; 617 618 for_each_rsnd_src(src, priv, i) { 619 rsnd_mod_quit(rsnd_mod_get(src)); 620 } 621 } 622