sound/soc/sh/rcar/src.c

   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 }