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 u64 n; 230 231 ifscr = 1; 232 n = (u64)0x0400000 * fin; 233 do_div(n, fout); 234 fsrate = n; 235 } 236 237 /* 238 * SRC_SRCCR / SRC_ROUTE_MODE0 239 */ 240 cr = 0x00011110; 241 route = 0x0; 242 if (fin != fout) { 243 route = 0x1; 244 245 if (rsnd_src_sync_is_enabled(mod)) { 246 cr |= 0x1; 247 route |= rsnd_io_is_play(io) ? 248 (0x1 << 24) : (0x1 << 25); 249 } 250 } 251 252 /* 253 * SRC_BSDSR / SRC_BSISR 254 */ 255 switch (rsnd_mod_id(mod)) { 256 case 5: 257 case 6: 258 case 7: 259 case 8: 260 bsdsr = 0x02400000; /* 6 - 1/6 */ 261 bsisr = 0x00100060; /* 6 - 1/6 */ 262 break; 263 default: 264 bsdsr = 0x01800000; /* 6 - 1/6 */ 265 bsisr = 0x00100060 ;/* 6 - 1/6 */ 266 break; 267 } 268 269 rsnd_mod_write(mod, SRC_ROUTE_MODE0, route); 270 271 rsnd_mod_write(mod, SRC_SRCIR, 1); /* initialize */ 272 rsnd_mod_write(mod, SRC_ADINR, adinr); 273 rsnd_mod_write(mod, SRC_IFSCR, ifscr); 274 rsnd_mod_write(mod, SRC_IFSVR, fsrate); 275 rsnd_mod_write(mod, SRC_SRCCR, cr); 276 rsnd_mod_write(mod, SRC_BSDSR, bsdsr); 277 rsnd_mod_write(mod, SRC_BSISR, bsisr); 278 rsnd_mod_write(mod, SRC_SRCIR, 0); /* cancel initialize */ 279 280 rsnd_mod_write(mod, SRC_I_BUSIF_MODE, 1); 281 rsnd_mod_write(mod, SRC_O_BUSIF_MODE, 1); 282 rsnd_mod_write(mod, SRC_BUSIF_DALIGN, rsnd_get_dalign(mod, io)); 283 284 rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout); 285 } 286 287 static int rsnd_src_irq(struct rsnd_mod *mod, 288 struct rsnd_dai_stream *io, 289 struct rsnd_priv *priv, 290 int enable) 291 { 292 struct rsnd_src *src = rsnd_mod_to_src(mod); 293 u32 sys_int_val, int_val, sys_int_mask; 294 int irq = src->irq; 295 int id = rsnd_mod_id(mod); 296 297 sys_int_val = 298 sys_int_mask = OUF_SRC(id); 299 int_val = 0x3300; 300 301 /* 302 * IRQ is not supported on non-DT 303 * see 304 * rsnd_src_probe_() 305 */ 306 if ((irq <= 0) || !enable) { 307 sys_int_val = 0; 308 int_val = 0; 309 } 310 311 /* 312 * WORKAROUND 313 * 314 * ignore over flow error when rsnd_src_sync_is_enabled() 315 */ 316 if (rsnd_src_sync_is_enabled(mod)) 317 sys_int_val = sys_int_val & 0xffff; 318 319 rsnd_mod_write(mod, SRC_INT_ENABLE0, int_val); 320 rsnd_mod_bset(mod, SCU_SYS_INT_EN0, sys_int_mask, sys_int_val); 321 rsnd_mod_bset(mod, SCU_SYS_INT_EN1, sys_int_mask, sys_int_val); 322 323 return 0; 324 } 325 326 static void rsnd_src_status_clear(struct rsnd_mod *mod) 327 { 328 u32 val = OUF_SRC(rsnd_mod_id(mod)); 329 330 rsnd_mod_bset(mod, SCU_SYS_STATUS0, val, val); 331 rsnd_mod_bset(mod, SCU_SYS_STATUS1, val, val); 332 } 333 334 static bool rsnd_src_error_occurred(struct rsnd_mod *mod) 335 { 336 u32 val0, val1; 337 bool ret = false; 338 339 val0 = val1 = OUF_SRC(rsnd_mod_id(mod)); 340 341 /* 342 * WORKAROUND 343 * 344 * ignore over flow error when rsnd_src_sync_is_enabled() 345 */ 346 if (rsnd_src_sync_is_enabled(mod)) 347 val0 = val0 & 0xffff; 348 349 if ((rsnd_mod_read(mod, SCU_SYS_STATUS0) & val0) || 350 (rsnd_mod_read(mod, SCU_SYS_STATUS1) & val1)) 351 ret = true; 352 353 return ret; 354 } 355 356 static int rsnd_src_start(struct rsnd_mod *mod, 357 struct rsnd_dai_stream *io, 358 struct rsnd_priv *priv) 359 { 360 u32 val; 361 362 /* 363 * WORKAROUND 364 * 365 * Enable SRC output if you want to use sync convert together with DVC 366 */ 367 val = (rsnd_io_to_mod_dvc(io) && !rsnd_src_sync_is_enabled(mod)) ? 368 0x01 : 0x11; 369 370 rsnd_mod_write(mod, SRC_CTRL, val); 371 372 return 0; 373 } 374 375 static int rsnd_src_stop(struct rsnd_mod *mod, 376 struct rsnd_dai_stream *io, 377 struct rsnd_priv *priv) 378 { 379 rsnd_mod_write(mod, SRC_CTRL, 0); 380 381 return 0; 382 } 383 384 static int rsnd_src_init(struct rsnd_mod *mod, 385 struct rsnd_dai_stream *io, 386 struct rsnd_priv *priv) 387 { 388 struct rsnd_src *src = rsnd_mod_to_src(mod); 389 390 rsnd_mod_power_on(mod); 391 392 rsnd_src_activation(mod); 393 394 rsnd_src_set_convert_rate(io, mod); 395 396 rsnd_src_status_clear(mod); 397 398 /* reset sync convert_rate */ 399 src->sync.val = 0; 400 401 return 0; 402 } 403 404 static int rsnd_src_quit(struct rsnd_mod *mod, 405 struct rsnd_dai_stream *io, 406 struct rsnd_priv *priv) 407 { 408 struct rsnd_src *src = rsnd_mod_to_src(mod); 409 410 rsnd_src_halt(mod); 411 412 rsnd_mod_power_off(mod); 413 414 src->convert_rate = 0; 415 416 /* reset sync convert_rate */ 417 src->sync.val = 0; 418 419 return 0; 420 } 421 422 static void __rsnd_src_interrupt(struct rsnd_mod *mod, 423 struct rsnd_dai_stream *io) 424 { 425 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 426 bool stop = false; 427 428 spin_lock(&priv->lock); 429 430 /* ignore all cases if not working */ 431 if (!rsnd_io_is_working(io)) 432 goto rsnd_src_interrupt_out; 433 434 if (rsnd_src_error_occurred(mod)) 435 stop = true; 436 437 rsnd_src_status_clear(mod); 438 rsnd_src_interrupt_out: 439 440 spin_unlock(&priv->lock); 441 442 if (stop) 443 snd_pcm_stop_xrun(io->substream); 444 } 445 446 static irqreturn_t rsnd_src_interrupt(int irq, void *data) 447 { 448 struct rsnd_mod *mod = data; 449 450 rsnd_mod_interrupt(mod, __rsnd_src_interrupt); 451 452 return IRQ_HANDLED; 453 } 454 455 static int rsnd_src_probe_(struct rsnd_mod *mod, 456 struct rsnd_dai_stream *io, 457 struct rsnd_priv *priv) 458 { 459 struct rsnd_src *src = rsnd_mod_to_src(mod); 460 struct device *dev = rsnd_priv_to_dev(priv); 461 int irq = src->irq; 462 int ret; 463 464 if (irq > 0) { 465 /* 466 * IRQ is not supported on non-DT 467 * see 468 * rsnd_src_irq() 469 */ 470 ret = devm_request_irq(dev, irq, 471 rsnd_src_interrupt, 472 IRQF_SHARED, 473 dev_name(dev), mod); 474 if (ret) 475 return ret; 476 } 477 478 ret = rsnd_dma_attach(io, mod, &src->dma, 0); 479 480 return ret; 481 } 482 483 static int rsnd_src_pcm_new(struct rsnd_mod *mod, 484 struct rsnd_dai_stream *io, 485 struct snd_soc_pcm_runtime *rtd) 486 { 487 struct rsnd_src *src = rsnd_mod_to_src(mod); 488 int ret; 489 490 /* 491 * enable SRC sync convert if possible 492 */ 493 494 /* 495 * It can't use SRC Synchronous convert 496 * when Capture if it uses CMD 497 */ 498 if (rsnd_io_to_mod_cmd(io) && !rsnd_io_is_play(io)) 499 return 0; 500 501 /* 502 * enable sync convert 503 */ 504 ret = rsnd_kctrl_new_s(mod, io, rtd, 505 rsnd_io_is_play(io) ? 506 "SRC Out Rate Switch" : 507 "SRC In Rate Switch", 508 rsnd_src_set_convert_rate, 509 &src->sen, 1); 510 if (ret < 0) 511 return ret; 512 513 ret = rsnd_kctrl_new_s(mod, io, rtd, 514 rsnd_io_is_play(io) ? 515 "SRC Out Rate" : 516 "SRC In Rate", 517 rsnd_src_set_convert_rate, 518 &src->sync, 192000); 519 520 return ret; 521 } 522 523 static struct rsnd_mod_ops rsnd_src_ops = { 524 .name = SRC_NAME, 525 .dma_req = rsnd_src_dma_req, 526 .probe = rsnd_src_probe_, 527 .init = rsnd_src_init, 528 .quit = rsnd_src_quit, 529 .start = rsnd_src_start, 530 .stop = rsnd_src_stop, 531 .irq = rsnd_src_irq, 532 .hw_params = rsnd_src_hw_params, 533 .pcm_new = rsnd_src_pcm_new, 534 }; 535 536 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id) 537 { 538 if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv))) 539 id = 0; 540 541 return rsnd_mod_get(rsnd_src_get(priv, id)); 542 } 543 544 int rsnd_src_probe(struct rsnd_priv *priv) 545 { 546 struct device_node *node; 547 struct device_node *np; 548 struct device *dev = rsnd_priv_to_dev(priv); 549 struct rsnd_src *src; 550 struct clk *clk; 551 char name[RSND_SRC_NAME_SIZE]; 552 int i, nr, ret; 553 554 /* This driver doesn't support Gen1 at this point */ 555 if (rsnd_is_gen1(priv)) 556 return 0; 557 558 node = rsnd_src_of_node(priv); 559 if (!node) 560 return 0; /* not used is not error */ 561 562 nr = of_get_child_count(node); 563 if (!nr) { 564 ret = -EINVAL; 565 goto rsnd_src_probe_done; 566 } 567 568 src = devm_kzalloc(dev, sizeof(*src) * nr, GFP_KERNEL); 569 if (!src) { 570 ret = -ENOMEM; 571 goto rsnd_src_probe_done; 572 } 573 574 priv->src_nr = nr; 575 priv->src = src; 576 577 i = 0; 578 for_each_child_of_node(node, np) { 579 if (!of_device_is_available(np)) 580 goto skip; 581 582 src = rsnd_src_get(priv, i); 583 584 snprintf(name, RSND_SRC_NAME_SIZE, "%s.%d", 585 SRC_NAME, i); 586 587 src->irq = irq_of_parse_and_map(np, 0); 588 if (!src->irq) { 589 ret = -EINVAL; 590 goto rsnd_src_probe_done; 591 } 592 593 clk = devm_clk_get(dev, name); 594 if (IS_ERR(clk)) { 595 ret = PTR_ERR(clk); 596 goto rsnd_src_probe_done; 597 } 598 599 ret = rsnd_mod_init(priv, rsnd_mod_get(src), 600 &rsnd_src_ops, clk, rsnd_mod_get_status, 601 RSND_MOD_SRC, i); 602 if (ret) 603 goto rsnd_src_probe_done; 604 605 skip: 606 i++; 607 } 608 609 ret = 0; 610 611 rsnd_src_probe_done: 612 of_node_put(node); 613 614 return ret; 615 } 616 617 void rsnd_src_remove(struct rsnd_priv *priv) 618 { 619 struct rsnd_src *src; 620 int i; 621 622 for_each_rsnd_src(src, priv, i) { 623 rsnd_mod_quit(rsnd_mod_get(src)); 624 } 625 } 626