sound/soc/sh/rcar/ssi.c

   1 /*
   2  * Renesas R-Car SSIU/SSI support
   3  *
   4  * Copyright (C) 2013 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * Based on fsi.c
   8  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/delay.h>
  15 #include "rsnd.h"
  16 #define RSND_SSI_NAME_SIZE 16
  17
  18 /*
  19  * SSICR
  20  */
  21 #define FORCE           (1 << 31)       /* Fixed */
  22 #define DMEN            (1 << 28)       /* DMA Enable */
  23 #define UIEN            (1 << 27)       /* Underflow Interrupt Enable */
  24 #define OIEN            (1 << 26)       /* Overflow Interrupt Enable */
  25 #define IIEN            (1 << 25)       /* Idle Mode Interrupt Enable */
  26 #define DIEN            (1 << 24)       /* Data Interrupt Enable */
  27 #define CHNL_4          (1 << 22)       /* Channels */
  28 #define CHNL_6          (2 << 22)       /* Channels */
  29 #define CHNL_8          (3 << 22)       /* Channels */
  30 #define DWL_8           (0 << 19)       /* Data Word Length */
  31 #define DWL_16          (1 << 19)       /* Data Word Length */
  32 #define DWL_18          (2 << 19)       /* Data Word Length */
  33 #define DWL_20          (3 << 19)       /* Data Word Length */
  34 #define DWL_22          (4 << 19)       /* Data Word Length */
  35 #define DWL_24          (5 << 19)       /* Data Word Length */
  36 #define DWL_32          (6 << 19)       /* Data Word Length */
  37
  38 #define SWL_32          (3 << 16)       /* R/W System Word Length */
  39 #define SCKD            (1 << 15)       /* Serial Bit Clock Direction */
  40 #define SWSD            (1 << 14)       /* Serial WS Direction */
  41 #define SCKP            (1 << 13)       /* Serial Bit Clock Polarity */
  42 #define SWSP            (1 << 12)       /* Serial WS Polarity */
  43 #define SDTA            (1 << 10)       /* Serial Data Alignment */
  44 #define PDTA            (1 <<  9)       /* Parallel Data Alignment */
  45 #define DEL             (1 <<  8)       /* Serial Data Delay */
  46 #define CKDV(v)         (v <<  4)       /* Serial Clock Division Ratio */
  47 #define TRMD            (1 <<  1)       /* Transmit/Receive Mode Select */
  48 #define EN              (1 <<  0)       /* SSI Module Enable */
  49
  50 /*
  51  * SSISR
  52  */
  53 #define UIRQ            (1 << 27)       /* Underflow Error Interrupt Status */
  54 #define OIRQ            (1 << 26)       /* Overflow Error Interrupt Status */
  55 #define IIRQ            (1 << 25)       /* Idle Mode Interrupt Status */
  56 #define DIRQ            (1 << 24)       /* Data Interrupt Status Flag */
  57
  58 /*
  59  * SSIWSR
  60  */
  61 #define CONT            (1 << 8)        /* WS Continue Function */
  62 #define WS_MODE         (1 << 0)        /* WS Mode */
  63
  64 #define SSI_NAME "ssi"
  65
  66 struct rsnd_ssi {
  67         struct rsnd_mod mod;
  68         struct rsnd_mod *dma;
  69
  70         u32 flags;
  71         u32 cr_own;
  72         u32 cr_clk;
  73         u32 cr_mode;
  74         u32 wsr;
  75         int chan;
  76         int rate;
  77         int irq;
  78         unsigned int usrcnt;
  79 };
  80
  81 /* flags */
  82 #define RSND_SSI_CLK_PIN_SHARE          (1 << 0)
  83 #define RSND_SSI_NO_BUSIF               (1 << 1) /* SSI+DMA without BUSIF */
  84
  85 #define for_each_rsnd_ssi(pos, priv, i)                                 \
  86         for (i = 0;                                                     \
  87              (i < rsnd_ssi_nr(priv)) &&                                 \
  88                 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));         \
  89              i++)
  90
  91 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
  92 #define rsnd_ssi_to_dma(mod) ((ssi)->dma)
  93 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
  94 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
  95 #define rsnd_ssi_mode_flags(p) ((p)->flags)
  96 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
  97 #define rsnd_ssi_is_multi_slave(mod, io) \
  98         (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
  99 #define rsnd_ssi_is_run_mods(mod, io) \
 100         (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
 101
 102 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 103 {
 104         struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
 105         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 106         int use_busif = 0;
 107
 108         if (!rsnd_ssi_is_dma_mode(mod))
 109                 return 0;
 110
 111         if (!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_NO_BUSIF))
 112                 use_busif = 1;
 113         if (rsnd_io_to_mod_src(io))
 114                 use_busif = 1;
 115
 116         return use_busif;
 117 }
 118
 119 static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
 120 {
 121         rsnd_mod_write(mod, SSISR, 0);
 122 }
 123
 124 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod)
 125 {
 126         return rsnd_mod_read(mod, SSISR);
 127 }
 128
 129 static void rsnd_ssi_status_check(struct rsnd_mod *mod,
 130                                   u32 bit)
 131 {
 132         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 133         struct device *dev = rsnd_priv_to_dev(priv);
 134         u32 status;
 135         int i;
 136
 137         for (i = 0; i < 1024; i++) {
 138                 status = rsnd_ssi_status_get(mod);
 139                 if (status & bit)
 140                         return;
 141
 142                 udelay(50);
 143         }
 144
 145         dev_warn(dev, "%s[%d] status check failed\n",
 146                  rsnd_mod_name(mod), rsnd_mod_id(mod));
 147 }
 148
 149 static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
 150 {
 151         struct rsnd_mod *mod;
 152         enum rsnd_mod_type types[] = {
 153                 RSND_MOD_SSIM1,
 154                 RSND_MOD_SSIM2,
 155                 RSND_MOD_SSIM3,
 156         };
 157         int i, mask;
 158
 159         mask = 0;
 160         for (i = 0; i < ARRAY_SIZE(types); i++) {
 161                 mod = rsnd_io_to_mod(io, types[i]);
 162                 if (!mod)
 163                         continue;
 164
 165                 mask |= 1 << rsnd_mod_id(mod);
 166         }
 167
 168         return mask;
 169 }
 170
 171 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io)
 172 {
 173         struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
 174         struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
 175
 176         return rsnd_ssi_multi_slaves_runtime(io) |
 177                 1 << rsnd_mod_id(ssi_mod) |
 178                 1 << rsnd_mod_id(ssi_parent_mod);
 179 }
 180
 181 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
 182 {
 183         if (rsnd_runtime_is_ssi_multi(io))
 184                 return rsnd_ssi_multi_slaves(io);
 185
 186         return 0;
 187 }
 188
 189 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 190                                      struct rsnd_dai_stream *io)
 191 {
 192         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 193         struct device *dev = rsnd_priv_to_dev(priv);
 194         struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 195         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 196         struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
 197         int chan = rsnd_runtime_channel_for_ssi(io);
 198         int j, ret;
 199         int ssi_clk_mul_table[] = {
 200                 1, 2, 4, 8, 16, 6, 12,
 201         };
 202         unsigned int main_rate;
 203         unsigned int rate = rsnd_io_is_play(io) ?
 204                 rsnd_src_get_out_rate(priv, io) :
 205                 rsnd_src_get_in_rate(priv, io);
 206
 207         if (!rsnd_rdai_is_clk_master(rdai))
 208                 return 0;
 209
 210         if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
 211                 return 0;
 212
 213         if (rsnd_ssi_is_multi_slave(mod, io))
 214                 return 0;
 215
 216         if (ssi->usrcnt > 1) {
 217                 if (ssi->rate != rate) {
 218                         dev_err(dev, "SSI parent/child should use same rate\n");
 219                         return -EINVAL;
 220                 }
 221
 222                 return 0;
 223         }
 224
 225         /*
 226          * Find best clock, and try to start ADG
 227          */
 228         for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
 229
 230                 /*
 231                  * this driver is assuming that
 232                  * system word is 32bit x chan
 233                  * see rsnd_ssi_init()
 234                  */
 235                 main_rate = rate * 32 * chan * ssi_clk_mul_table[j];
 236
 237                 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate);
 238                 if (0 == ret) {
 239                         ssi->cr_clk     = FORCE | SWL_32 |
 240                                 SCKD | SWSD | CKDV(j);
 241                         ssi->wsr = CONT;
 242
 243                         ssi->rate = rate;
 244
 245                         dev_dbg(dev, "%s[%d] outputs %u Hz\n",
 246                                 rsnd_mod_name(mod),
 247                                 rsnd_mod_id(mod), rate);
 248
 249                         return 0;
 250                 }
 251         }
 252
 253         dev_err(dev, "unsupported clock rate\n");
 254         return -EIO;
 255 }
 256
 257 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod,
 258                                      struct rsnd_dai_stream *io)
 259 {
 260         struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 261         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 262         struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
 263
 264         if (!rsnd_rdai_is_clk_master(rdai))
 265                 return;
 266
 267         if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
 268                 return;
 269
 270         if (ssi->usrcnt > 1)
 271                 return;
 272
 273         ssi->cr_clk     = 0;
 274         ssi->rate       = 0;
 275
 276         rsnd_adg_ssi_clk_stop(mod);
 277 }
 278
 279 static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 280                                 struct rsnd_dai_stream *io)
 281 {
 282         struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 283         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 284         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 285         u32 cr_own;
 286         u32 cr_mode;
 287         u32 wsr;
 288         int is_tdm;
 289
 290         is_tdm = rsnd_runtime_is_ssi_tdm(io);
 291
 292         /*
 293          * always use 32bit system word.
 294          * see also rsnd_ssi_master_clk_enable()
 295          */
 296         cr_own = FORCE | SWL_32 | PDTA;
 297
 298         if (rdai->bit_clk_inv)
 299                 cr_own |= SCKP;
 300         if (rdai->frm_clk_inv ^ is_tdm)
 301                 cr_own |= SWSP;
 302         if (rdai->data_alignment)
 303                 cr_own |= SDTA;
 304         if (rdai->sys_delay)
 305                 cr_own |= DEL;
 306         if (rsnd_io_is_play(io))
 307                 cr_own |= TRMD;
 308
 309         switch (runtime->sample_bits) {
 310         case 16:
 311                 cr_own |= DWL_16;
 312                 break;
 313         case 32:
 314                 cr_own |= DWL_24;
 315                 break;
 316         }
 317
 318         if (rsnd_ssi_is_dma_mode(mod)) {
 319                 cr_mode = UIEN | OIEN | /* over/under run */
 320                           DMEN;         /* DMA : enable DMA */
 321         } else {
 322                 cr_mode = DIEN;         /* PIO : enable Data interrupt */
 323         }
 324
 325         /*
 326          * TDM Extend Mode
 327          * see
 328          *      rsnd_ssiu_init_gen2()
 329          */
 330         wsr = ssi->wsr;
 331         if (is_tdm) {
 332                 wsr     |= WS_MODE;
 333                 cr_own  |= CHNL_8;
 334         }
 335
 336         ssi->cr_own     = cr_own;
 337         ssi->cr_mode    = cr_mode;
 338         ssi->wsr        = wsr;
 339 }
 340
 341 static void rsnd_ssi_register_setup(struct rsnd_mod *mod)
 342 {
 343         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 344
 345         rsnd_mod_write(mod, SSIWSR,     ssi->wsr);
 346         rsnd_mod_write(mod, SSICR,      ssi->cr_own     |
 347                                         ssi->cr_clk     |
 348                                         ssi->cr_mode); /* without EN */
 349 }
 350
 351 /*
 352  *      SSI mod common functions
 353  */
 354 static int rsnd_ssi_init(struct rsnd_mod *mod,
 355                          struct rsnd_dai_stream *io,
 356                          struct rsnd_priv *priv)
 357 {
 358         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 359         int ret;
 360
 361         if (!rsnd_ssi_is_run_mods(mod, io))
 362                 return 0;
 363
 364         ssi->usrcnt++;
 365
 366         rsnd_mod_power_on(mod);
 367
 368         ret = rsnd_ssi_master_clk_start(mod, io);
 369         if (ret < 0)
 370                 return ret;
 371
 372         if (!rsnd_ssi_is_parent(mod, io))
 373                 rsnd_ssi_config_init(mod, io);
 374
 375         rsnd_ssi_register_setup(mod);
 376
 377         /* clear error status */
 378         rsnd_ssi_status_clear(mod);
 379
 380         return 0;
 381 }
 382
 383 static int rsnd_ssi_quit(struct rsnd_mod *mod,
 384                          struct rsnd_dai_stream *io,
 385                          struct rsnd_priv *priv)
 386 {
 387         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 388         struct device *dev = rsnd_priv_to_dev(priv);
 389
 390         if (!rsnd_ssi_is_run_mods(mod, io))
 391                 return 0;
 392
 393         if (!ssi->usrcnt) {
 394                 dev_err(dev, "%s[%d] usrcnt error\n",
 395                         rsnd_mod_name(mod), rsnd_mod_id(mod));
 396                 return -EIO;
 397         }
 398
 399         if (!rsnd_ssi_is_parent(mod, io))
 400                 ssi->cr_own     = 0;
 401
 402         rsnd_ssi_master_clk_stop(mod, io);
 403
 404         rsnd_mod_power_off(mod);
 405
 406         ssi->usrcnt--;
 407
 408         return 0;
 409 }
 410
 411 static int rsnd_ssi_hw_params(struct rsnd_mod *mod,
 412                               struct rsnd_dai_stream *io,
 413                               struct snd_pcm_substream *substream,
 414                               struct snd_pcm_hw_params *params)
 415 {
 416         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 417         int chan = params_channels(params);
 418
 419         /*
 420          * snd_pcm_ops::hw_params will be called *before*
 421          * snd_soc_dai_ops::trigger. Thus, ssi->usrcnt is 0
 422          * in 1st call.
 423          */
 424         if (ssi->usrcnt) {
 425                 /*
 426                  * Already working.
 427                  * It will happen if SSI has parent/child connection.
 428                  * it is error if child <-> parent SSI uses
 429                  * different channels.
 430                  */
 431                 if (ssi->chan != chan)
 432                         return -EIO;
 433         }
 434
 435         ssi->chan = chan;
 436
 437         return 0;
 438 }
 439
 440 static int rsnd_ssi_start(struct rsnd_mod *mod,
 441                           struct rsnd_dai_stream *io,
 442                           struct rsnd_priv *priv)
 443 {
 444         if (!rsnd_ssi_is_run_mods(mod, io))
 445                 return 0;
 446
 447         /*
 448          * EN will be set via SSIU :: SSI_CONTROL
 449          * if Multi channel mode
 450          */
 451         if (rsnd_ssi_multi_slaves_runtime(io))
 452                 return 0;
 453
 454         rsnd_mod_bset(mod, SSICR, EN, EN);
 455
 456         return 0;
 457 }
 458
 459 static int rsnd_ssi_stop(struct rsnd_mod *mod,
 460                          struct rsnd_dai_stream *io,
 461                          struct rsnd_priv *priv)
 462 {
 463         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 464         u32 cr;
 465
 466         if (!rsnd_ssi_is_run_mods(mod, io))
 467                 return 0;
 468
 469         /*
 470          * don't stop if not last user
 471          * see also
 472          *      rsnd_ssi_start
 473          *      rsnd_ssi_interrupt
 474          */
 475         if (ssi->usrcnt > 1)
 476                 return 0;
 477
 478         /*
 479          * disable all IRQ,
 480          * and, wait all data was sent
 481          */
 482         cr  =   ssi->cr_own     |
 483                 ssi->cr_clk;
 484
 485         rsnd_mod_write(mod, SSICR, cr | EN);
 486         rsnd_ssi_status_check(mod, DIRQ);
 487
 488         /*
 489          * disable SSI,
 490          * and, wait idle state
 491          */
 492         rsnd_mod_write(mod, SSICR, cr); /* disabled all */
 493         rsnd_ssi_status_check(mod, IIRQ);
 494
 495         return 0;
 496 }
 497
 498 static int rsnd_ssi_irq(struct rsnd_mod *mod,
 499                         struct rsnd_dai_stream *io,
 500                         struct rsnd_priv *priv,
 501                         int enable)
 502 {
 503         u32 val = 0;
 504
 505         if (rsnd_is_gen1(priv))
 506                 return 0;
 507
 508         if (rsnd_ssi_is_parent(mod, io))
 509                 return 0;
 510
 511         if (!rsnd_ssi_is_run_mods(mod, io))
 512                 return 0;
 513
 514         if (enable)
 515                 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;
 516
 517         rsnd_mod_write(mod, SSI_INT_ENABLE, val);
 518
 519         return 0;
 520 }
 521
 522 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
 523                                  struct rsnd_dai_stream *io)
 524 {
 525         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 526         int is_dma = rsnd_ssi_is_dma_mode(mod);
 527         u32 status;
 528         bool elapsed = false;
 529         bool stop = false;
 530
 531         spin_lock(&priv->lock);
 532
 533         /* ignore all cases if not working */
 534         if (!rsnd_io_is_working(io))
 535                 goto rsnd_ssi_interrupt_out;
 536
 537         status = rsnd_ssi_status_get(mod);
 538
 539         /* PIO only */
 540         if (!is_dma && (status & DIRQ)) {
 541                 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 542                 u32 *buf = (u32 *)(runtime->dma_area +
 543                                    rsnd_dai_pointer_offset(io, 0));
 544
 545                 /*
 546                  * 8/16/32 data can be assesse to TDR/RDR register
 547                  * directly as 32bit data
 548                  * see rsnd_ssi_init()
 549                  */
 550                 if (rsnd_io_is_play(io))
 551                         rsnd_mod_write(mod, SSITDR, *buf);
 552                 else
 553                         *buf = rsnd_mod_read(mod, SSIRDR);
 554
 555                 elapsed = rsnd_dai_pointer_update(io, sizeof(*buf));
 556         }
 557
 558         /* DMA only */
 559         if (is_dma && (status & (UIRQ | OIRQ)))
 560                 stop = true;
 561
 562         rsnd_ssi_status_clear(mod);
 563 rsnd_ssi_interrupt_out:
 564         spin_unlock(&priv->lock);
 565
 566         if (elapsed)
 567                 rsnd_dai_period_elapsed(io);
 568
 569         if (stop)
 570                 snd_pcm_stop_xrun(io->substream);
 571
 572 }
 573
 574 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
 575 {
 576         struct rsnd_mod *mod = data;
 577
 578         rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt);
 579
 580         return IRQ_HANDLED;
 581 }
 582
 583 /*
 584  *              SSI PIO
 585  */
 586 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod,
 587                                    struct rsnd_dai_stream *io)
 588 {
 589         struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 590         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 591
 592         if (!__rsnd_ssi_is_pin_sharing(mod))
 593                 return;
 594
 595         if (!rsnd_rdai_is_clk_master(rdai))
 596                 return;
 597
 598         switch (rsnd_mod_id(mod)) {
 599         case 1:
 600         case 2:
 601                 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP);
 602                 break;
 603         case 4:
 604                 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP);
 605                 break;
 606         case 8:
 607                 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP);
 608                 break;
 609         }
 610 }
 611
 612 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod,
 613                             struct rsnd_dai_stream *io,
 614                             struct snd_soc_pcm_runtime *rtd)
 615 {
 616         /*
 617          * rsnd_rdai_is_clk_master() will be enabled after set_fmt,
 618          * and, pcm_new will be called after it.
 619          * This function reuse pcm_new at this point.
 620          */
 621         rsnd_ssi_parent_attach(mod, io);
 622
 623         return 0;
 624 }
 625
 626 static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 627                                  struct rsnd_dai_stream *io,
 628                                  struct rsnd_priv *priv)
 629 {
 630         struct device *dev = rsnd_priv_to_dev(priv);
 631         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 632         int ret;
 633
 634         /*
 635          * SSIP/SSIU/IRQ are not needed on
 636          * SSI Multi slaves
 637          */
 638         if (rsnd_ssi_is_multi_slave(mod, io))
 639                 return 0;
 640
 641         /*
 642          * It can't judge ssi parent at this point
 643          * see rsnd_ssi_pcm_new()
 644          */
 645
 646         ret = rsnd_ssiu_attach(io, mod);
 647         if (ret < 0)
 648                 return ret;
 649
 650         /*
 651          * SSI might be called again as PIO fallback
 652          * It is easy to manual handling for IRQ request/free
 653          */
 654         ret = request_irq(ssi->irq,
 655                           rsnd_ssi_interrupt,
 656                           IRQF_SHARED,
 657                           dev_name(dev), mod);
 658
 659         return ret;
 660 }
 661
 662 static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
 663         .name   = SSI_NAME,
 664         .probe  = rsnd_ssi_common_probe,
 665         .init   = rsnd_ssi_init,
 666         .quit   = rsnd_ssi_quit,
 667         .start  = rsnd_ssi_start,
 668         .stop   = rsnd_ssi_stop,
 669         .irq    = rsnd_ssi_irq,
 670         .pcm_new = rsnd_ssi_pcm_new,
 671         .hw_params = rsnd_ssi_hw_params,
 672 };
 673
 674 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod,
 675                               struct rsnd_dai_stream *io,
 676                               struct rsnd_priv *priv)
 677 {
 678         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 679         int ret;
 680
 681         /*
 682          * SSIP/SSIU/IRQ/DMA are not needed on
 683          * SSI Multi slaves
 684          */
 685         if (rsnd_ssi_is_multi_slave(mod, io))
 686                 return 0;
 687
 688         ret = rsnd_ssi_common_probe(mod, io, priv);
 689         if (ret)
 690                 return ret;
 691
 692         /* SSI probe might be called many times in MUX multi path */
 693         ret = rsnd_dma_attach(io, mod, &ssi->dma);
 694
 695         return ret;
 696 }
 697
 698 static int rsnd_ssi_dma_remove(struct rsnd_mod *mod,
 699                                struct rsnd_dai_stream *io,
 700                                struct rsnd_priv *priv)
 701 {
 702         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 703
 704         /* PIO will request IRQ again */
 705         free_irq(ssi->irq, mod);
 706
 707         return 0;
 708 }
 709
 710 static int rsnd_ssi_fallback(struct rsnd_mod *mod,
 711                              struct rsnd_dai_stream *io,
 712                              struct rsnd_priv *priv)
 713 {
 714         struct device *dev = rsnd_priv_to_dev(priv);
 715
 716         /*
 717          * fallback to PIO
 718          *
 719          * SSI .probe might be called again.
 720          * see
 721          *      rsnd_rdai_continuance_probe()
 722          */
 723         mod->ops = &rsnd_ssi_pio_ops;
 724
 725         dev_info(dev, "%s[%d] fallback to PIO mode\n",
 726                  rsnd_mod_name(mod), rsnd_mod_id(mod));
 727
 728         return 0;
 729 }
 730
 731 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 732                                          struct rsnd_mod *mod)
 733 {
 734         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 735         int is_play = rsnd_io_is_play(io);
 736         char *name;
 737
 738         if (rsnd_ssi_use_busif(io))
 739                 name = is_play ? "rxu" : "txu";
 740         else
 741                 name = is_play ? "rx" : "tx";
 742
 743         return rsnd_dma_request_channel(rsnd_ssi_of_node(priv),
 744                                         mod, name);
 745 }
 746
 747 static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
 748         .name   = SSI_NAME,
 749         .dma_req = rsnd_ssi_dma_req,
 750         .probe  = rsnd_ssi_dma_probe,
 751         .remove = rsnd_ssi_dma_remove,
 752         .init   = rsnd_ssi_init,
 753         .quit   = rsnd_ssi_quit,
 754         .start  = rsnd_ssi_start,
 755         .stop   = rsnd_ssi_stop,
 756         .irq    = rsnd_ssi_irq,
 757         .pcm_new = rsnd_ssi_pcm_new,
 758         .fallback = rsnd_ssi_fallback,
 759         .hw_params = rsnd_ssi_hw_params,
 760 };
 761
 762 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
 763 {
 764         return mod->ops == &rsnd_ssi_dma_ops;
 765 }
 766
 767
 768 /*
 769  *              Non SSI
 770  */
 771 static struct rsnd_mod_ops rsnd_ssi_non_ops = {
 772         .name   = SSI_NAME,
 773 };
 774
 775 /*
 776  *              ssi mod function
 777  */
 778 static void rsnd_ssi_connect(struct rsnd_mod *mod,
 779                              struct rsnd_dai_stream *io)
 780 {
 781         struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 782         enum rsnd_mod_type types[] = {
 783                 RSND_MOD_SSI,
 784                 RSND_MOD_SSIM1,
 785                 RSND_MOD_SSIM2,
 786                 RSND_MOD_SSIM3,
 787         };
 788         enum rsnd_mod_type type;
 789         int i;
 790
 791         /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */
 792         for (i = 0; i < ARRAY_SIZE(types); i++) {
 793                 type = types[i];
 794                 if (!rsnd_io_to_mod(io, type)) {
 795                         rsnd_dai_connect(mod, io, type);
 796                         rsnd_set_slot(rdai, 2 * (i + 1), (i + 1));
 797                         return;
 798                 }
 799         }
 800 }
 801
 802 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
 803                             struct device_node *playback,
 804                             struct device_node *capture)
 805 {
 806         struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
 807         struct device_node *node;
 808         struct device_node *np;
 809         struct rsnd_mod *mod;
 810         int i;
 811
 812         node = rsnd_ssi_of_node(priv);
 813         if (!node)
 814                 return;
 815
 816         i = 0;
 817         for_each_child_of_node(node, np) {
 818                 mod = rsnd_ssi_mod_get(priv, i);
 819                 if (np == playback)
 820                         rsnd_ssi_connect(mod, &rdai->playback);
 821                 if (np == capture)
 822                         rsnd_ssi_connect(mod, &rdai->capture);
 823                 i++;
 824         }
 825
 826         of_node_put(node);
 827 }
 828
 829 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
 830 {
 831         if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))
 832                 id = 0;
 833
 834         return rsnd_mod_get(rsnd_ssi_get(priv, id));
 835 }
 836
 837 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod)
 838 {
 839         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 840
 841         return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_CLK_PIN_SHARE);
 842 }
 843
 844 static u32 *rsnd_ssi_get_status(struct rsnd_dai_stream *io,
 845                                 struct rsnd_mod *mod,
 846                                 enum rsnd_mod_type type)
 847 {
 848         /*
 849          * SSIP (= SSI parent) needs to be special, otherwise,
 850          * 2nd SSI might doesn't start. see also rsnd_mod_call()
 851          *
 852          * We can't include parent SSI status on SSI, because we don't know
 853          * how many SSI requests parent SSI. Thus, it is localed on "io" now.
 854          * ex) trouble case
 855          *      Playback: SSI0
 856          *      Capture : SSI1 (needs SSI0)
 857          *
 858          * 1) start Capture  -> SSI0/SSI1 are started.
 859          * 2) start Playback -> SSI0 doesn't work, because it is already
 860          *                      marked as "started" on 1)
 861          *
 862          * OTOH, using each mod's status is good for MUX case.
 863          * It doesn't need to start in 2nd start
 864          * ex)
 865          *      IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0
 866          *                          |
 867          *      IO-1: SRC1 -> CTU2 -+
 868          *
 869          * 1) start IO-0 ->     start SSI0
 870          * 2) start IO-1 ->     SSI0 doesn't need to start, because it is
 871          *                      already started on 1)
 872          */
 873         if (type == RSND_MOD_SSIP)
 874                 return &io->parent_ssi_status;
 875
 876         return rsnd_mod_get_status(io, mod, type);
 877 }
 878
 879 int rsnd_ssi_probe(struct rsnd_priv *priv)
 880 {
 881         struct device_node *node;
 882         struct device_node *np;
 883         struct device *dev = rsnd_priv_to_dev(priv);
 884         struct rsnd_mod_ops *ops;
 885         struct clk *clk;
 886         struct rsnd_ssi *ssi;
 887         char name[RSND_SSI_NAME_SIZE];
 888         int i, nr, ret;
 889
 890         node = rsnd_ssi_of_node(priv);
 891         if (!node)
 892                 return -EINVAL;
 893
 894         nr = of_get_child_count(node);
 895         if (!nr) {
 896                 ret = -EINVAL;
 897                 goto rsnd_ssi_probe_done;
 898         }
 899
 900         ssi     = devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL);
 901         if (!ssi) {
 902                 ret = -ENOMEM;
 903                 goto rsnd_ssi_probe_done;
 904         }
 905
 906         priv->ssi       = ssi;
 907         priv->ssi_nr    = nr;
 908
 909         i = 0;
 910         for_each_child_of_node(node, np) {
 911                 ssi = rsnd_ssi_get(priv, i);
 912
 913                 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d",
 914                          SSI_NAME, i);
 915
 916                 clk = devm_clk_get(dev, name);
 917                 if (IS_ERR(clk)) {
 918                         ret = PTR_ERR(clk);
 919                         goto rsnd_ssi_probe_done;
 920                 }
 921
 922                 if (of_get_property(np, "shared-pin", NULL))
 923                         ssi->flags |= RSND_SSI_CLK_PIN_SHARE;
 924
 925                 if (of_get_property(np, "no-busif", NULL))
 926                         ssi->flags |= RSND_SSI_NO_BUSIF;
 927
 928                 ssi->irq = irq_of_parse_and_map(np, 0);
 929                 if (!ssi->irq) {
 930                         ret = -EINVAL;
 931                         goto rsnd_ssi_probe_done;
 932                 }
 933
 934                 ops = &rsnd_ssi_non_ops;
 935                 if (of_property_read_bool(np, "pio-transfer"))
 936                         ops = &rsnd_ssi_pio_ops;
 937                 else
 938                         ops = &rsnd_ssi_dma_ops;
 939
 940                 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk,
 941                                     rsnd_ssi_get_status, RSND_MOD_SSI, i);
 942                 if (ret)
 943                         goto rsnd_ssi_probe_done;
 944
 945                 i++;
 946         }
 947
 948         ret = 0;
 949
 950 rsnd_ssi_probe_done:
 951         of_node_put(node);
 952
 953         return ret;
 954 }
 955
 956 void rsnd_ssi_remove(struct rsnd_priv *priv)
 957 {
 958         struct rsnd_ssi *ssi;
 959         int i;
 960
 961         for_each_rsnd_ssi(ssi, priv, i) {
 962                 rsnd_mod_quit(rsnd_mod_get(ssi));
 963         }
 964 }