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
  28 #define DWL_8           (0 << 19)       /* Data Word Length */
  29 #define DWL_16          (1 << 19)       /* Data Word Length */
  30 #define DWL_18          (2 << 19)       /* Data Word Length */
  31 #define DWL_20          (3 << 19)       /* Data Word Length */
  32 #define DWL_22          (4 << 19)       /* Data Word Length */
  33 #define DWL_24          (5 << 19)       /* Data Word Length */
  34 #define DWL_32          (6 << 19)       /* Data Word Length */
  35
  36 #define SWL_32          (3 << 16)       /* R/W System Word Length */
  37 #define SCKD            (1 << 15)       /* Serial Bit Clock Direction */
  38 #define SWSD            (1 << 14)       /* Serial WS Direction */
  39 #define SCKP            (1 << 13)       /* Serial Bit Clock Polarity */
  40 #define SWSP            (1 << 12)       /* Serial WS Polarity */
  41 #define SDTA            (1 << 10)       /* Serial Data Alignment */
  42 #define DEL             (1 <<  8)       /* Serial Data Delay */
  43 #define CKDV(v)         (v <<  4)       /* Serial Clock Division Ratio */
  44 #define TRMD            (1 <<  1)       /* Transmit/Receive Mode Select */
  45 #define EN              (1 <<  0)       /* SSI Module Enable */
  46
  47 /*
  48  * SSISR
  49  */
  50 #define UIRQ            (1 << 27)       /* Underflow Error Interrupt Status */
  51 #define OIRQ            (1 << 26)       /* Overflow Error Interrupt Status */
  52 #define IIRQ            (1 << 25)       /* Idle Mode Interrupt Status */
  53 #define DIRQ            (1 << 24)       /* Data Interrupt Status Flag */
  54
  55 /*
  56  * SSIWSR
  57  */
  58 #define CONT            (1 << 8)        /* WS Continue Function */
  59
  60 #define SSI_NAME "ssi"
  61
  62 struct rsnd_ssi {
  63         struct clk *clk;
  64         struct rsnd_ssi_platform_info *info; /* rcar_snd.h */
  65         struct rsnd_ssi *parent;
  66         struct rsnd_mod mod;
  67
  68         struct rsnd_dai *rdai;
  69         u32 cr_own;
  70         u32 cr_clk;
  71         u32 cr_etc;
  72         int err;
  73         unsigned int usrcnt;
  74         unsigned int rate;
  75 };
  76
  77 #define for_each_rsnd_ssi(pos, priv, i)                                 \
  78         for (i = 0;                                                     \
  79              (i < rsnd_ssi_nr(priv)) &&                                 \
  80                 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));         \
  81              i++)
  82
  83 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
  84 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
  85 #define rsnd_dma_to_ssi(dma)  rsnd_mod_to_ssi(rsnd_dma_to_mod(dma))
  86 #define rsnd_ssi_pio_available(ssi) ((ssi)->info->pio_irq > 0)
  87 #define rsnd_ssi_dma_available(ssi) \
  88         rsnd_dma_available(rsnd_mod_to_dma(&(ssi)->mod))
  89 #define rsnd_ssi_clk_from_parent(ssi) ((ssi)->parent)
  90 #define rsnd_ssi_mode_flags(p) ((p)->info->flags)
  91 #define rsnd_ssi_dai_id(ssi) ((ssi)->info->dai_id)
  92
  93 static int rsnd_ssi_use_busif(struct rsnd_mod *mod)
  94 {
  95         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
  96         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
  97         int use_busif = 0;
  98
  99         if (!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_NO_BUSIF))
 100                 use_busif = 1;
 101         if (rsnd_io_to_mod_src(io))
 102                 use_busif = 1;
 103
 104         return use_busif;
 105 }
 106
 107 static void rsnd_ssi_status_check(struct rsnd_mod *mod,
 108                                   u32 bit)
 109 {
 110         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 111         struct device *dev = rsnd_priv_to_dev(priv);
 112         u32 status;
 113         int i;
 114
 115         for (i = 0; i < 1024; i++) {
 116                 status = rsnd_mod_read(mod, SSISR);
 117                 if (status & bit)
 118                         return;
 119
 120                 udelay(50);
 121         }
 122
 123         dev_warn(dev, "status check failed\n");
 124 }
 125
 126 static int rsnd_ssi_master_clk_start(struct rsnd_ssi *ssi,
 127                                      struct rsnd_dai_stream *io)
 128 {
 129         struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
 130         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 131         struct device *dev = rsnd_priv_to_dev(priv);
 132         int i, j, ret;
 133         int adg_clk_div_table[] = {
 134                 1, 6, /* see adg.c */
 135         };
 136         int ssi_clk_mul_table[] = {
 137                 1, 2, 4, 8, 16, 6, 12,
 138         };
 139         unsigned int main_rate;
 140         unsigned int rate = rsnd_src_get_ssi_rate(priv, io, runtime);
 141
 142         /*
 143          * Find best clock, and try to start ADG
 144          */
 145         for (i = 0; i < ARRAY_SIZE(adg_clk_div_table); i++) {
 146                 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
 147
 148                         /*
 149                          * this driver is assuming that
 150                          * system word is 64fs (= 2 x 32bit)
 151                          * see rsnd_ssi_init()
 152                          */
 153                         main_rate = rate / adg_clk_div_table[i]
 154                                 * 32 * 2 * ssi_clk_mul_table[j];
 155
 156                         ret = rsnd_adg_ssi_clk_try_start(&ssi->mod, main_rate);
 157                         if (0 == ret) {
 158                                 ssi->rate       = rate;
 159                                 ssi->cr_clk     = FORCE | SWL_32 |
 160                                                   SCKD | SWSD | CKDV(j);
 161
 162                                 dev_dbg(dev, "ssi%d outputs %u Hz\n",
 163                                         rsnd_mod_id(&ssi->mod), rate);
 164
 165                                 return 0;
 166                         }
 167                 }
 168         }
 169
 170         dev_err(dev, "unsupported clock rate\n");
 171         return -EIO;
 172 }
 173
 174 static void rsnd_ssi_master_clk_stop(struct rsnd_ssi *ssi)
 175 {
 176         ssi->rate = 0;
 177         ssi->cr_clk = 0;
 178         rsnd_adg_ssi_clk_stop(&ssi->mod);
 179 }
 180
 181 static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
 182                               struct rsnd_dai *rdai,
 183                               struct rsnd_dai_stream *io)
 184 {
 185         struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
 186         struct device *dev = rsnd_priv_to_dev(priv);
 187         u32 cr;
 188
 189         if (0 == ssi->usrcnt) {
 190                 clk_prepare_enable(ssi->clk);
 191
 192                 if (rsnd_dai_is_clk_master(rdai)) {
 193                         if (rsnd_ssi_clk_from_parent(ssi))
 194                                 rsnd_ssi_hw_start(ssi->parent, rdai, io);
 195                         else
 196                                 rsnd_ssi_master_clk_start(ssi, io);
 197                 }
 198         }
 199
 200         cr  =   ssi->cr_own     |
 201                 ssi->cr_clk     |
 202                 ssi->cr_etc     |
 203                 EN;
 204
 205         rsnd_mod_write(&ssi->mod, SSICR, cr);
 206
 207         ssi->usrcnt++;
 208
 209         dev_dbg(dev, "ssi%d hw started\n", rsnd_mod_id(&ssi->mod));
 210 }
 211
 212 static void rsnd_ssi_hw_stop(struct rsnd_ssi *ssi,
 213                              struct rsnd_dai *rdai)
 214 {
 215         struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
 216         struct device *dev = rsnd_priv_to_dev(priv);
 217         u32 cr;
 218
 219         if (0 == ssi->usrcnt) /* stop might be called without start */
 220                 return;
 221
 222         ssi->usrcnt--;
 223
 224         if (0 == ssi->usrcnt) {
 225                 /*
 226                  * disable all IRQ,
 227                  * and, wait all data was sent
 228                  */
 229                 cr  =   ssi->cr_own     |
 230                         ssi->cr_clk;
 231
 232                 rsnd_mod_write(&ssi->mod, SSICR, cr | EN);
 233                 rsnd_ssi_status_check(&ssi->mod, DIRQ);
 234
 235                 /*
 236                  * disable SSI,
 237                  * and, wait idle state
 238                  */
 239                 rsnd_mod_write(&ssi->mod, SSICR, cr);   /* disabled all */
 240                 rsnd_ssi_status_check(&ssi->mod, IIRQ);
 241
 242                 if (rsnd_dai_is_clk_master(rdai)) {
 243                         if (rsnd_ssi_clk_from_parent(ssi))
 244                                 rsnd_ssi_hw_stop(ssi->parent, rdai);
 245                         else
 246                                 rsnd_ssi_master_clk_stop(ssi);
 247                 }
 248
 249                 clk_disable_unprepare(ssi->clk);
 250         }
 251
 252         dev_dbg(dev, "ssi%d hw stopped\n", rsnd_mod_id(&ssi->mod));
 253 }
 254
 255 /*
 256  *      SSI mod common functions
 257  */
 258 static int rsnd_ssi_init(struct rsnd_mod *mod,
 259                          struct rsnd_dai *rdai)
 260 {
 261         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 262         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 263         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 264         u32 cr;
 265
 266         cr = FORCE;
 267
 268         /*
 269          * always use 32bit system word for easy clock calculation.
 270          * see also rsnd_ssi_master_clk_enable()
 271          */
 272         cr |= SWL_32;
 273
 274         /*
 275          * init clock settings for SSICR
 276          */
 277         switch (runtime->sample_bits) {
 278         case 16:
 279                 cr |= DWL_16;
 280                 break;
 281         case 32:
 282                 cr |= DWL_24;
 283                 break;
 284         default:
 285                 return -EIO;
 286         }
 287
 288         if (rdai->bit_clk_inv)
 289                 cr |= SCKP;
 290         if (rdai->frm_clk_inv)
 291                 cr |= SWSP;
 292         if (rdai->data_alignment)
 293                 cr |= SDTA;
 294         if (rdai->sys_delay)
 295                 cr |= DEL;
 296         if (rsnd_dai_is_play(rdai, io))
 297                 cr |= TRMD;
 298
 299         /*
 300          * set ssi parameter
 301          */
 302         ssi->rdai       = rdai;
 303         ssi->cr_own     = cr;
 304         ssi->err        = -1; /* ignore 1st error */
 305
 306         return 0;
 307 }
 308
 309 static int rsnd_ssi_quit(struct rsnd_mod *mod,
 310                          struct rsnd_dai *rdai)
 311 {
 312         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 313         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 314         struct device *dev = rsnd_priv_to_dev(priv);
 315
 316         if (ssi->err > 0)
 317                 dev_warn(dev, "ssi under/over flow err = %d\n", ssi->err);
 318
 319         ssi->rdai       = NULL;
 320         ssi->cr_own     = 0;
 321         ssi->err        = 0;
 322
 323         return 0;
 324 }
 325
 326 static void rsnd_ssi_record_error(struct rsnd_ssi *ssi, u32 status)
 327 {
 328         /* under/over flow error */
 329         if (status & (UIRQ | OIRQ)) {
 330                 ssi->err++;
 331
 332                 /* clear error status */
 333                 rsnd_mod_write(&ssi->mod, SSISR, 0);
 334         }
 335 }
 336
 337 /*
 338  *              SSI PIO
 339  */
 340 static irqreturn_t rsnd_ssi_pio_interrupt(int irq, void *data)
 341 {
 342         struct rsnd_ssi *ssi = data;
 343         struct rsnd_mod *mod = &ssi->mod;
 344         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 345         u32 status = rsnd_mod_read(mod, SSISR);
 346         irqreturn_t ret = IRQ_NONE;
 347
 348         if (io && (status & DIRQ)) {
 349                 struct rsnd_dai *rdai = ssi->rdai;
 350                 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 351                 u32 *buf = (u32 *)(runtime->dma_area +
 352                                    rsnd_dai_pointer_offset(io, 0));
 353
 354                 rsnd_ssi_record_error(ssi, status);
 355
 356                 /*
 357                  * 8/16/32 data can be assesse to TDR/RDR register
 358                  * directly as 32bit data
 359                  * see rsnd_ssi_init()
 360                  */
 361                 if (rsnd_dai_is_play(rdai, io))
 362                         rsnd_mod_write(mod, SSITDR, *buf);
 363                 else
 364                         *buf = rsnd_mod_read(mod, SSIRDR);
 365
 366                 rsnd_dai_pointer_update(io, sizeof(*buf));
 367
 368                 ret = IRQ_HANDLED;
 369         }
 370
 371         return ret;
 372 }
 373
 374 static int rsnd_ssi_pio_probe(struct rsnd_mod *mod,
 375                               struct rsnd_dai *rdai)
 376 {
 377         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 378         struct device *dev = rsnd_priv_to_dev(priv);
 379         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 380         int irq = ssi->info->pio_irq;
 381         int ret;
 382
 383         ret = devm_request_irq(dev, irq,
 384                                rsnd_ssi_pio_interrupt,
 385                                IRQF_SHARED,
 386                                dev_name(dev), ssi);
 387         if (ret)
 388                 dev_err(dev, "SSI request interrupt failed\n");
 389
 390         dev_dbg(dev, "%s (PIO) is probed\n", rsnd_mod_name(mod));
 391
 392         return ret;
 393 }
 394
 395 static int rsnd_ssi_pio_start(struct rsnd_mod *mod,
 396                               struct rsnd_dai *rdai)
 397 {
 398         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 399         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 400
 401         /* enable PIO IRQ */
 402         ssi->cr_etc = UIEN | OIEN | DIEN;
 403
 404         rsnd_src_ssiu_start(mod, rdai, 0);
 405
 406         rsnd_src_enable_ssi_irq(mod, rdai);
 407
 408         rsnd_ssi_hw_start(ssi, rdai, io);
 409
 410         return 0;
 411 }
 412
 413 static int rsnd_ssi_pio_stop(struct rsnd_mod *mod,
 414                              struct rsnd_dai *rdai)
 415 {
 416         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 417
 418         ssi->cr_etc = 0;
 419
 420         rsnd_ssi_hw_stop(ssi, rdai);
 421
 422         rsnd_src_ssiu_stop(mod, rdai, 0);
 423
 424         return 0;
 425 }
 426
 427 static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
 428         .name   = SSI_NAME,
 429         .probe  = rsnd_ssi_pio_probe,
 430         .init   = rsnd_ssi_init,
 431         .quit   = rsnd_ssi_quit,
 432         .start  = rsnd_ssi_pio_start,
 433         .stop   = rsnd_ssi_pio_stop,
 434 };
 435
 436 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod,
 437                           struct rsnd_dai *rdai)
 438 {
 439         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 440         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 441         struct device *dev = rsnd_priv_to_dev(priv);
 442         int dma_id = ssi->info->dma_id;
 443         int ret;
 444
 445         ret = rsnd_dma_init(
 446                 priv, rsnd_mod_to_dma(mod),
 447                 rsnd_info_is_playback(priv, ssi),
 448                 dma_id);
 449
 450         if (ret < 0)
 451                 dev_err(dev, "SSI DMA failed\n");
 452
 453         dev_dbg(dev, "%s (DMA) is probed\n", rsnd_mod_name(mod));
 454
 455         return ret;
 456 }
 457
 458 static int rsnd_ssi_dma_remove(struct rsnd_mod *mod,
 459                                struct rsnd_dai *rdai)
 460 {
 461         rsnd_dma_quit(rsnd_mod_to_priv(mod), rsnd_mod_to_dma(mod));
 462
 463         return 0;
 464 }
 465
 466 static int rsnd_ssi_dma_start(struct rsnd_mod *mod,
 467                               struct rsnd_dai *rdai)
 468 {
 469         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 470         struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
 471         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 472
 473         /* enable DMA transfer */
 474         ssi->cr_etc = DMEN;
 475
 476         rsnd_src_ssiu_start(mod, rdai, rsnd_ssi_use_busif(mod));
 477
 478         rsnd_dma_start(dma);
 479
 480         rsnd_ssi_hw_start(ssi, ssi->rdai, io);
 481
 482         /* enable WS continue */
 483         if (rsnd_dai_is_clk_master(rdai))
 484                 rsnd_mod_write(&ssi->mod, SSIWSR, CONT);
 485
 486         return 0;
 487 }
 488
 489 static int rsnd_ssi_dma_stop(struct rsnd_mod *mod,
 490                              struct rsnd_dai *rdai)
 491 {
 492         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 493         struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
 494
 495         ssi->cr_etc = 0;
 496
 497         rsnd_ssi_record_error(ssi, rsnd_mod_read(mod, SSISR));
 498
 499         rsnd_ssi_hw_stop(ssi, rdai);
 500
 501         rsnd_dma_stop(dma);
 502
 503         rsnd_src_ssiu_stop(mod, rdai, 1);
 504
 505         return 0;
 506 }
 507
 508 static char *rsnd_ssi_dma_name(struct rsnd_mod *mod)
 509 {
 510         return rsnd_ssi_use_busif(mod) ? "ssiu" : SSI_NAME;
 511 }
 512
 513 static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
 514         .name   = SSI_NAME,
 515         .dma_name = rsnd_ssi_dma_name,
 516         .probe  = rsnd_ssi_dma_probe,
 517         .remove = rsnd_ssi_dma_remove,
 518         .init   = rsnd_ssi_init,
 519         .quit   = rsnd_ssi_quit,
 520         .start  = rsnd_ssi_dma_start,
 521         .stop   = rsnd_ssi_dma_stop,
 522 };
 523
 524 /*
 525  *              Non SSI
 526  */
 527 static struct rsnd_mod_ops rsnd_ssi_non_ops = {
 528         .name   = SSI_NAME,
 529 };
 530
 531 /*
 532  *              ssi mod function
 533  */
 534 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
 535 {
 536         if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))
 537                 id = 0;
 538
 539         return &((struct rsnd_ssi *)(priv->ssi) + id)->mod;
 540 }
 541
 542 int rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod)
 543 {
 544         struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 545
 546         return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_CLK_PIN_SHARE);
 547 }
 548
 549 static void rsnd_ssi_parent_clk_setup(struct rsnd_priv *priv, struct rsnd_ssi *ssi)
 550 {
 551         if (!rsnd_ssi_is_pin_sharing(&ssi->mod))
 552                 return;
 553
 554         switch (rsnd_mod_id(&ssi->mod)) {
 555         case 1:
 556         case 2:
 557                 ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 0));
 558                 break;
 559         case 4:
 560                 ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 3));
 561                 break;
 562         case 8:
 563                 ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 7));
 564                 break;
 565         }
 566 }
 567
 568
 569 static void rsnd_of_parse_ssi(struct platform_device *pdev,
 570                               const struct rsnd_of_data *of_data,
 571                               struct rsnd_priv *priv)
 572 {
 573         struct device_node *node;
 574         struct device_node *np;
 575         struct rsnd_ssi_platform_info *ssi_info;
 576         struct rcar_snd_info *info = rsnd_priv_to_info(priv);
 577         struct device *dev = &pdev->dev;
 578         int nr, i;
 579
 580         if (!of_data)
 581                 return;
 582
 583         node = of_get_child_by_name(dev->of_node, "rcar_sound,ssi");
 584         if (!node)
 585                 return;
 586
 587         nr = of_get_child_count(node);
 588         if (!nr)
 589                 goto rsnd_of_parse_ssi_end;
 590
 591         ssi_info = devm_kzalloc(dev,
 592                                 sizeof(struct rsnd_ssi_platform_info) * nr,
 593                                 GFP_KERNEL);
 594         if (!ssi_info) {
 595                 dev_err(dev, "ssi info allocation error\n");
 596                 goto rsnd_of_parse_ssi_end;
 597         }
 598
 599         info->ssi_info          = ssi_info;
 600         info->ssi_info_nr       = nr;
 601
 602         i = -1;
 603         for_each_child_of_node(node, np) {
 604                 i++;
 605
 606                 ssi_info = info->ssi_info + i;
 607
 608                 /*
 609                  * pin settings
 610                  */
 611                 if (of_get_property(np, "shared-pin", NULL))
 612                         ssi_info->flags |= RSND_SSI_CLK_PIN_SHARE;
 613
 614                 /*
 615                  * irq
 616                  */
 617                 ssi_info->pio_irq = irq_of_parse_and_map(np, 0);
 618
 619                 /*
 620                  * DMA
 621                  */
 622                 ssi_info->dma_id = of_get_property(np, "pio-transfer", NULL) ?
 623                         0 : 1;
 624
 625                 if (of_get_property(np, "no-busif", NULL))
 626                         ssi_info->flags |= RSND_SSI_NO_BUSIF;
 627         }
 628
 629 rsnd_of_parse_ssi_end:
 630         of_node_put(node);
 631 }
 632
 633 int rsnd_ssi_probe(struct platform_device *pdev,
 634                    const struct rsnd_of_data *of_data,
 635                    struct rsnd_priv *priv)
 636 {
 637         struct rcar_snd_info *info = rsnd_priv_to_info(priv);
 638         struct rsnd_ssi_platform_info *pinfo;
 639         struct device *dev = rsnd_priv_to_dev(priv);
 640         struct rsnd_mod_ops *ops;
 641         struct clk *clk;
 642         struct rsnd_ssi *ssi;
 643         char name[RSND_SSI_NAME_SIZE];
 644         int i, nr;
 645
 646         rsnd_of_parse_ssi(pdev, of_data, priv);
 647
 648         /*
 649          *      init SSI
 650          */
 651         nr      = info->ssi_info_nr;
 652         ssi     = devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL);
 653         if (!ssi) {
 654                 dev_err(dev, "SSI allocate failed\n");
 655                 return -ENOMEM;
 656         }
 657
 658         priv->ssi       = ssi;
 659         priv->ssi_nr    = nr;
 660
 661         for_each_rsnd_ssi(ssi, priv, i) {
 662                 pinfo = &info->ssi_info[i];
 663
 664                 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d",
 665                          SSI_NAME, i);
 666
 667                 clk = devm_clk_get(dev, name);
 668                 if (IS_ERR(clk))
 669                         return PTR_ERR(clk);
 670
 671                 ssi->info       = pinfo;
 672                 ssi->clk        = clk;
 673
 674                 ops = &rsnd_ssi_non_ops;
 675                 if (pinfo->dma_id > 0)
 676                         ops = &rsnd_ssi_dma_ops;
 677                 else if (rsnd_ssi_pio_available(ssi))
 678                         ops = &rsnd_ssi_pio_ops;
 679
 680                 rsnd_mod_init(priv, &ssi->mod, ops, RSND_MOD_SSI, i);
 681
 682                 rsnd_ssi_parent_clk_setup(priv, ssi);
 683         }
 684
 685         return 0;
 686 }