linux/sound/soc/sh/rcar/ssi.c
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   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Renesas R-Car SSIU/SSI support
   4//
   5// Copyright (C) 2013 Renesas Solutions Corp.
   6// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7//
   8// Based on fsi.c
   9// Kuninori Morimoto <morimoto.kuninori@renesas.com>
  10
  11/*
  12 * you can enable below define if you don't need
  13 * SSI interrupt status debug message when debugging
  14 * see rsnd_dbg_irq_status()
  15 *
  16 * #define RSND_DEBUG_NO_IRQ_STATUS 1
  17 */
  18
  19#include <sound/simple_card_utils.h>
  20#include <linux/delay.h>
  21#include "rsnd.h"
  22#define RSND_SSI_NAME_SIZE 16
  23
  24/*
  25 * SSICR
  26 */
  27#define FORCE           (1 << 31)       /* Fixed */
  28#define DMEN            (1 << 28)       /* DMA Enable */
  29#define UIEN            (1 << 27)       /* Underflow Interrupt Enable */
  30#define OIEN            (1 << 26)       /* Overflow Interrupt Enable */
  31#define IIEN            (1 << 25)       /* Idle Mode Interrupt Enable */
  32#define DIEN            (1 << 24)       /* Data Interrupt Enable */
  33#define CHNL_4          (1 << 22)       /* Channels */
  34#define CHNL_6          (2 << 22)       /* Channels */
  35#define CHNL_8          (3 << 22)       /* Channels */
  36#define DWL_MASK        (7 << 19)       /* Data Word Length mask */
  37#define DWL_8           (0 << 19)       /* Data Word Length */
  38#define DWL_16          (1 << 19)       /* Data Word Length */
  39#define DWL_18          (2 << 19)       /* Data Word Length */
  40#define DWL_20          (3 << 19)       /* Data Word Length */
  41#define DWL_22          (4 << 19)       /* Data Word Length */
  42#define DWL_24          (5 << 19)       /* Data Word Length */
  43#define DWL_32          (6 << 19)       /* Data Word Length */
  44
  45/*
  46 * System word length
  47 */
  48#define SWL_16          (1 << 16)       /* R/W System Word Length */
  49#define SWL_24          (2 << 16)       /* R/W System Word Length */
  50#define SWL_32          (3 << 16)       /* R/W System Word Length */
  51
  52#define SCKD            (1 << 15)       /* Serial Bit Clock Direction */
  53#define SWSD            (1 << 14)       /* Serial WS Direction */
  54#define SCKP            (1 << 13)       /* Serial Bit Clock Polarity */
  55#define SWSP            (1 << 12)       /* Serial WS Polarity */
  56#define SDTA            (1 << 10)       /* Serial Data Alignment */
  57#define PDTA            (1 <<  9)       /* Parallel Data Alignment */
  58#define DEL             (1 <<  8)       /* Serial Data Delay */
  59#define CKDV(v)         (v <<  4)       /* Serial Clock Division Ratio */
  60#define TRMD            (1 <<  1)       /* Transmit/Receive Mode Select */
  61#define EN              (1 <<  0)       /* SSI Module Enable */
  62
  63/*
  64 * SSISR
  65 */
  66#define UIRQ            (1 << 27)       /* Underflow Error Interrupt Status */
  67#define OIRQ            (1 << 26)       /* Overflow Error Interrupt Status */
  68#define IIRQ            (1 << 25)       /* Idle Mode Interrupt Status */
  69#define DIRQ            (1 << 24)       /* Data Interrupt Status Flag */
  70
  71/*
  72 * SSIWSR
  73 */
  74#define CONT            (1 << 8)        /* WS Continue Function */
  75#define WS_MODE         (1 << 0)        /* WS Mode */
  76
  77#define SSI_NAME "ssi"
  78
  79struct rsnd_ssi {
  80        struct rsnd_mod mod;
  81
  82        u32 flags;
  83        u32 cr_own;
  84        u32 cr_clk;
  85        u32 cr_mode;
  86        u32 cr_en;
  87        u32 wsr;
  88        int chan;
  89        int rate;
  90        int irq;
  91        unsigned int usrcnt;
  92
  93        /* for PIO */
  94        int byte_pos;
  95        int byte_per_period;
  96        int next_period_byte;
  97};
  98
  99/* flags */
 100#define RSND_SSI_CLK_PIN_SHARE          (1 << 0)
 101#define RSND_SSI_NO_BUSIF               (1 << 1) /* SSI+DMA without BUSIF */
 102#define RSND_SSI_PROBED                 (1 << 2)
 103
 104#define for_each_rsnd_ssi(pos, priv, i)                                 \
 105        for (i = 0;                                                     \
 106             (i < rsnd_ssi_nr(priv)) &&                                 \
 107                ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));         \
 108             i++)
 109
 110#define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
 111#define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
 112#define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
 113#define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
 114#define rsnd_ssi_is_multi_slave(mod, io) \
 115        (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
 116#define rsnd_ssi_is_run_mods(mod, io) \
 117        (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
 118#define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod))
 119
 120static int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
 121
 122int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 123{
 124        struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
 125        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 126        int use_busif = 0;
 127
 128        if (!rsnd_ssi_is_dma_mode(mod))
 129                return 0;
 130
 131        if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF)))
 132                use_busif = 1;
 133        if (rsnd_io_to_mod_src(io))
 134                use_busif = 1;
 135
 136        return use_busif;
 137}
 138
 139static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
 140{
 141        rsnd_mod_write(mod, SSISR, 0);
 142}
 143
 144static u32 rsnd_ssi_status_get(struct rsnd_mod *mod)
 145{
 146        return rsnd_mod_read(mod, SSISR);
 147}
 148
 149static void rsnd_ssi_status_check(struct rsnd_mod *mod,
 150                                  u32 bit)
 151{
 152        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 153        struct device *dev = rsnd_priv_to_dev(priv);
 154        u32 status;
 155        int i;
 156
 157        for (i = 0; i < 1024; i++) {
 158                status = rsnd_ssi_status_get(mod);
 159                if (status & bit)
 160                        return;
 161
 162                udelay(5);
 163        }
 164
 165        dev_warn(dev, "%s status check failed\n", rsnd_mod_name(mod));
 166}
 167
 168static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
 169{
 170        struct rsnd_mod *mod;
 171        enum rsnd_mod_type types[] = {
 172                RSND_MOD_SSIM1,
 173                RSND_MOD_SSIM2,
 174                RSND_MOD_SSIM3,
 175        };
 176        int i, mask;
 177
 178        mask = 0;
 179        for (i = 0; i < ARRAY_SIZE(types); i++) {
 180                mod = rsnd_io_to_mod(io, types[i]);
 181                if (!mod)
 182                        continue;
 183
 184                mask |= 1 << rsnd_mod_id(mod);
 185        }
 186
 187        return mask;
 188}
 189
 190static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io)
 191{
 192        struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
 193        struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
 194        u32 mods;
 195
 196        mods = rsnd_ssi_multi_slaves_runtime(io) |
 197                1 << rsnd_mod_id(ssi_mod);
 198
 199        if (ssi_parent_mod)
 200                mods |= 1 << rsnd_mod_id(ssi_parent_mod);
 201
 202        return mods;
 203}
 204
 205u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
 206{
 207        if (rsnd_runtime_is_multi_ssi(io))
 208                return rsnd_ssi_multi_slaves(io);
 209
 210        return 0;
 211}
 212
 213static u32 rsnd_rdai_width_to_swl(struct rsnd_dai *rdai)
 214{
 215        struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
 216        struct device *dev = rsnd_priv_to_dev(priv);
 217        int width = rsnd_rdai_width_get(rdai);
 218
 219        switch (width) {
 220        case 32: return SWL_32;
 221        case 24: return SWL_24;
 222        case 16: return SWL_16;
 223        }
 224
 225        dev_err(dev, "unsupported slot width value: %d\n", width);
 226        return 0;
 227}
 228
 229unsigned int rsnd_ssi_clk_query(struct rsnd_dai *rdai,
 230                       int param1, int param2, int *idx)
 231{
 232        struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
 233        int ssi_clk_mul_table[] = {
 234                1, 2, 4, 8, 16, 6, 12,
 235        };
 236        int j, ret;
 237        unsigned int main_rate;
 238        int width = rsnd_rdai_width_get(rdai);
 239
 240        for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
 241
 242                /*
 243                 * It will set SSIWSR.CONT here, but SSICR.CKDV = 000
 244                 * with it is not allowed. (SSIWSR.WS_MODE with
 245                 * SSICR.CKDV = 000 is not allowed either).
 246                 * Skip it. See SSICR.CKDV
 247                 */
 248                if (j == 0)
 249                        continue;
 250
 251                main_rate = width * param1 * param2 * ssi_clk_mul_table[j];
 252
 253                ret = rsnd_adg_clk_query(priv, main_rate);
 254                if (ret < 0)
 255                        continue;
 256
 257                if (idx)
 258                        *idx = j;
 259
 260                return main_rate;
 261        }
 262
 263        return 0;
 264}
 265
 266static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 267                                     struct rsnd_dai_stream *io)
 268{
 269        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 270        struct device *dev = rsnd_priv_to_dev(priv);
 271        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 272        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 273        int chan = rsnd_runtime_channel_for_ssi(io);
 274        int idx, ret;
 275        unsigned int main_rate;
 276        unsigned int rate = rsnd_io_is_play(io) ?
 277                rsnd_src_get_out_rate(priv, io) :
 278                rsnd_src_get_in_rate(priv, io);
 279
 280        if (!rsnd_rdai_is_clk_master(rdai))
 281                return 0;
 282
 283        if (!rsnd_ssi_can_output_clk(mod))
 284                return 0;
 285
 286        if (rsnd_ssi_is_multi_slave(mod, io))
 287                return 0;
 288
 289        if (ssi->usrcnt > 0) {
 290                if (ssi->rate != rate) {
 291                        dev_err(dev, "SSI parent/child should use same rate\n");
 292                        return -EINVAL;
 293                }
 294
 295                if (ssi->chan != chan) {
 296                        dev_err(dev, "SSI parent/child should use same chan\n");
 297                        return -EINVAL;
 298                }
 299
 300                return 0;
 301        }
 302
 303        if (rsnd_runtime_is_tdm_split(io))
 304                chan = rsnd_io_converted_chan(io);
 305
 306        chan = rsnd_channel_normalization(chan);
 307
 308        main_rate = rsnd_ssi_clk_query(rdai, rate, chan, &idx);
 309        if (!main_rate) {
 310                dev_err(dev, "unsupported clock rate\n");
 311                return -EIO;
 312        }
 313
 314        ret = rsnd_adg_ssi_clk_try_start(mod, main_rate);
 315        if (ret < 0)
 316                return ret;
 317
 318        /*
 319         * SSI clock will be output contiguously
 320         * by below settings.
 321         * This means, rsnd_ssi_master_clk_start()
 322         * and rsnd_ssi_register_setup() are necessary
 323         * for SSI parent
 324         *
 325         * SSICR  : FORCE, SCKD, SWSD
 326         * SSIWSR : CONT
 327         */
 328        ssi->cr_clk = FORCE | rsnd_rdai_width_to_swl(rdai) |
 329                        SCKD | SWSD | CKDV(idx);
 330        ssi->wsr = CONT;
 331        ssi->rate = rate;
 332        ssi->chan = chan;
 333
 334        dev_dbg(dev, "%s outputs %d chan %u Hz\n",
 335                rsnd_mod_name(mod), chan, rate);
 336
 337        return 0;
 338}
 339
 340static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod,
 341                                     struct rsnd_dai_stream *io)
 342{
 343        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 344        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 345
 346        if (!rsnd_rdai_is_clk_master(rdai))
 347                return;
 348
 349        if (!rsnd_ssi_can_output_clk(mod))
 350                return;
 351
 352        if (ssi->usrcnt > 1)
 353                return;
 354
 355        ssi->cr_clk     = 0;
 356        ssi->rate       = 0;
 357        ssi->chan       = 0;
 358
 359        rsnd_adg_ssi_clk_stop(mod);
 360}
 361
 362static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 363                                struct rsnd_dai_stream *io)
 364{
 365        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 366        struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
 367        struct device *dev = rsnd_priv_to_dev(priv);
 368        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 369        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 370        u32 cr_own      = ssi->cr_own;
 371        u32 cr_mode     = ssi->cr_mode;
 372        u32 wsr         = ssi->wsr;
 373        int width;
 374        int is_tdm, is_tdm_split;
 375
 376        is_tdm          = rsnd_runtime_is_tdm(io);
 377        is_tdm_split    = rsnd_runtime_is_tdm_split(io);
 378
 379        if (is_tdm)
 380                dev_dbg(dev, "TDM mode\n");
 381        if (is_tdm_split)
 382                dev_dbg(dev, "TDM Split mode\n");
 383
 384        cr_own |= FORCE | rsnd_rdai_width_to_swl(rdai);
 385
 386        if (rdai->bit_clk_inv)
 387                cr_own |= SCKP;
 388        if (rdai->frm_clk_inv && !is_tdm)
 389                cr_own |= SWSP;
 390        if (rdai->data_alignment)
 391                cr_own |= SDTA;
 392        if (rdai->sys_delay)
 393                cr_own |= DEL;
 394
 395        /*
 396         * TDM Mode
 397         * see
 398         *      rsnd_ssiu_init_gen2()
 399         */
 400        wsr = ssi->wsr;
 401        if (is_tdm || is_tdm_split) {
 402                wsr     |= WS_MODE;
 403                cr_own  |= CHNL_8;
 404        }
 405
 406        /*
 407         * We shouldn't exchange SWSP after running.
 408         * This means, parent needs to care it.
 409         */
 410        if (rsnd_ssi_is_parent(mod, io))
 411                goto init_end;
 412
 413        if (rsnd_io_is_play(io))
 414                cr_own |= TRMD;
 415
 416        cr_own &= ~DWL_MASK;
 417        width = snd_pcm_format_width(runtime->format);
 418        if (is_tdm_split) {
 419                /*
 420                 * The SWL and DWL bits in SSICR should be fixed at 32-bit
 421                 * setting when TDM split mode.
 422                 * see datasheet
 423                 *      Operation :: TDM Format Split Function (TDM Split Mode)
 424                 */
 425                width = 32;
 426        }
 427
 428        switch (width) {
 429        case 8:
 430                cr_own |= DWL_8;
 431                break;
 432        case 16:
 433                cr_own |= DWL_16;
 434                break;
 435        case 24:
 436                cr_own |= DWL_24;
 437                break;
 438        case 32:
 439                cr_own |= DWL_32;
 440                break;
 441        }
 442
 443        if (rsnd_ssi_is_dma_mode(mod)) {
 444                cr_mode = UIEN | OIEN | /* over/under run */
 445                          DMEN;         /* DMA : enable DMA */
 446        } else {
 447                cr_mode = DIEN;         /* PIO : enable Data interrupt */
 448        }
 449
 450init_end:
 451        ssi->cr_own     = cr_own;
 452        ssi->cr_mode    = cr_mode;
 453        ssi->wsr        = wsr;
 454}
 455
 456static void rsnd_ssi_register_setup(struct rsnd_mod *mod)
 457{
 458        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 459
 460        rsnd_mod_write(mod, SSIWSR,     ssi->wsr);
 461        rsnd_mod_write(mod, SSICR,      ssi->cr_own     |
 462                                        ssi->cr_clk     |
 463                                        ssi->cr_mode    |
 464                                        ssi->cr_en);
 465}
 466
 467/*
 468 *      SSI mod common functions
 469 */
 470static int rsnd_ssi_init(struct rsnd_mod *mod,
 471                         struct rsnd_dai_stream *io,
 472                         struct rsnd_priv *priv)
 473{
 474        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 475
 476        if (!rsnd_ssi_is_run_mods(mod, io))
 477                return 0;
 478
 479        ssi->usrcnt++;
 480
 481        rsnd_mod_power_on(mod);
 482
 483        rsnd_ssi_config_init(mod, io);
 484
 485        rsnd_ssi_register_setup(mod);
 486
 487        /* clear error status */
 488        rsnd_ssi_status_clear(mod);
 489
 490        return 0;
 491}
 492
 493static int rsnd_ssi_quit(struct rsnd_mod *mod,
 494                         struct rsnd_dai_stream *io,
 495                         struct rsnd_priv *priv)
 496{
 497        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 498        struct device *dev = rsnd_priv_to_dev(priv);
 499
 500        if (!rsnd_ssi_is_run_mods(mod, io))
 501                return 0;
 502
 503        if (!ssi->usrcnt) {
 504                dev_err(dev, "%s usrcnt error\n", rsnd_mod_name(mod));
 505                return -EIO;
 506        }
 507
 508        rsnd_ssi_master_clk_stop(mod, io);
 509
 510        rsnd_mod_power_off(mod);
 511
 512        ssi->usrcnt--;
 513
 514        if (!ssi->usrcnt) {
 515                ssi->cr_own     = 0;
 516                ssi->cr_mode    = 0;
 517                ssi->wsr        = 0;
 518        }
 519
 520        return 0;
 521}
 522
 523static int rsnd_ssi_hw_params(struct rsnd_mod *mod,
 524                              struct rsnd_dai_stream *io,
 525                              struct snd_pcm_substream *substream,
 526                              struct snd_pcm_hw_params *params)
 527{
 528        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 529        unsigned int fmt_width = snd_pcm_format_width(params_format(params));
 530
 531        if (fmt_width > rdai->chan_width) {
 532                struct rsnd_priv *priv = rsnd_io_to_priv(io);
 533                struct device *dev = rsnd_priv_to_dev(priv);
 534
 535                dev_err(dev, "invalid combination of slot-width and format-data-width\n");
 536                return -EINVAL;
 537        }
 538
 539        return 0;
 540}
 541
 542static int rsnd_ssi_start(struct rsnd_mod *mod,
 543                          struct rsnd_dai_stream *io,
 544                          struct rsnd_priv *priv)
 545{
 546        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 547
 548        if (!rsnd_ssi_is_run_mods(mod, io))
 549                return 0;
 550
 551        /*
 552         * EN will be set via SSIU :: SSI_CONTROL
 553         * if Multi channel mode
 554         */
 555        if (rsnd_ssi_multi_slaves_runtime(io))
 556                return 0;
 557
 558        /*
 559         * EN is for data output.
 560         * SSI parent EN is not needed.
 561         */
 562        if (rsnd_ssi_is_parent(mod, io))
 563                return 0;
 564
 565        ssi->cr_en = EN;
 566
 567        rsnd_mod_write(mod, SSICR,      ssi->cr_own     |
 568                                        ssi->cr_clk     |
 569                                        ssi->cr_mode    |
 570                                        ssi->cr_en);
 571
 572        return 0;
 573}
 574
 575static int rsnd_ssi_stop(struct rsnd_mod *mod,
 576                         struct rsnd_dai_stream *io,
 577                         struct rsnd_priv *priv)
 578{
 579        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 580        u32 cr;
 581
 582        if (!rsnd_ssi_is_run_mods(mod, io))
 583                return 0;
 584
 585        if (rsnd_ssi_is_parent(mod, io))
 586                return 0;
 587
 588        cr  =   ssi->cr_own     |
 589                ssi->cr_clk;
 590
 591        /*
 592         * disable all IRQ,
 593         * Playback: Wait all data was sent
 594         * Capture:  It might not receave data. Do nothing
 595         */
 596        if (rsnd_io_is_play(io)) {
 597                rsnd_mod_write(mod, SSICR, cr | EN);
 598                rsnd_ssi_status_check(mod, DIRQ);
 599        }
 600
 601        /*
 602         * disable SSI,
 603         * and, wait idle state
 604         */
 605        rsnd_mod_write(mod, SSICR, cr); /* disabled all */
 606        rsnd_ssi_status_check(mod, IIRQ);
 607
 608        ssi->cr_en = 0;
 609
 610        return 0;
 611}
 612
 613static int rsnd_ssi_irq(struct rsnd_mod *mod,
 614                        struct rsnd_dai_stream *io,
 615                        struct rsnd_priv *priv,
 616                        int enable)
 617{
 618        u32 val = 0;
 619
 620        if (rsnd_is_gen1(priv))
 621                return 0;
 622
 623        if (rsnd_ssi_is_parent(mod, io))
 624                return 0;
 625
 626        if (!rsnd_ssi_is_run_mods(mod, io))
 627                return 0;
 628
 629        if (enable)
 630                val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;
 631
 632        rsnd_mod_write(mod, SSI_INT_ENABLE, val);
 633
 634        return 0;
 635}
 636
 637static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod,
 638                                   struct rsnd_dai_stream *io);
 639static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
 640                                 struct rsnd_dai_stream *io)
 641{
 642        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 643        struct device *dev = rsnd_priv_to_dev(priv);
 644        int is_dma = rsnd_ssi_is_dma_mode(mod);
 645        u32 status;
 646        bool elapsed = false;
 647        bool stop = false;
 648
 649        spin_lock(&priv->lock);
 650
 651        /* ignore all cases if not working */
 652        if (!rsnd_io_is_working(io))
 653                goto rsnd_ssi_interrupt_out;
 654
 655        status = rsnd_ssi_status_get(mod);
 656
 657        /* PIO only */
 658        if (!is_dma && (status & DIRQ))
 659                elapsed = rsnd_ssi_pio_interrupt(mod, io);
 660
 661        /* DMA only */
 662        if (is_dma && (status & (UIRQ | OIRQ))) {
 663                rsnd_dbg_irq_status(dev, "%s err status : 0x%08x\n",
 664                        rsnd_mod_name(mod), status);
 665
 666                stop = true;
 667        }
 668
 669        rsnd_ssi_status_clear(mod);
 670rsnd_ssi_interrupt_out:
 671        spin_unlock(&priv->lock);
 672
 673        if (elapsed)
 674                rsnd_dai_period_elapsed(io);
 675
 676        if (stop)
 677                snd_pcm_stop_xrun(io->substream);
 678
 679}
 680
 681static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
 682{
 683        struct rsnd_mod *mod = data;
 684
 685        rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt);
 686
 687        return IRQ_HANDLED;
 688}
 689
 690static u32 *rsnd_ssi_get_status(struct rsnd_mod *mod,
 691                                struct rsnd_dai_stream *io,
 692                                enum rsnd_mod_type type)
 693{
 694        /*
 695         * SSIP (= SSI parent) needs to be special, otherwise,
 696         * 2nd SSI might doesn't start. see also rsnd_mod_call()
 697         *
 698         * We can't include parent SSI status on SSI, because we don't know
 699         * how many SSI requests parent SSI. Thus, it is localed on "io" now.
 700         * ex) trouble case
 701         *      Playback: SSI0
 702         *      Capture : SSI1 (needs SSI0)
 703         *
 704         * 1) start Capture  -> SSI0/SSI1 are started.
 705         * 2) start Playback -> SSI0 doesn't work, because it is already
 706         *                      marked as "started" on 1)
 707         *
 708         * OTOH, using each mod's status is good for MUX case.
 709         * It doesn't need to start in 2nd start
 710         * ex)
 711         *      IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0
 712         *                          |
 713         *      IO-1: SRC1 -> CTU2 -+
 714         *
 715         * 1) start IO-0 ->     start SSI0
 716         * 2) start IO-1 ->     SSI0 doesn't need to start, because it is
 717         *                      already started on 1)
 718         */
 719        if (type == RSND_MOD_SSIP)
 720                return &io->parent_ssi_status;
 721
 722        return rsnd_mod_get_status(mod, io, type);
 723}
 724
 725/*
 726 *              SSI PIO
 727 */
 728static void rsnd_ssi_parent_attach(struct rsnd_mod *mod,
 729                                   struct rsnd_dai_stream *io)
 730{
 731        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
 732        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 733
 734        if (!__rsnd_ssi_is_pin_sharing(mod))
 735                return;
 736
 737        if (!rsnd_rdai_is_clk_master(rdai))
 738                return;
 739
 740        switch (rsnd_mod_id(mod)) {
 741        case 1:
 742        case 2:
 743                rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP);
 744                break;
 745        case 4:
 746                rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP);
 747                break;
 748        case 8:
 749                rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP);
 750                break;
 751        }
 752}
 753
 754static int rsnd_ssi_pcm_new(struct rsnd_mod *mod,
 755                            struct rsnd_dai_stream *io,
 756                            struct snd_soc_pcm_runtime *rtd)
 757{
 758        /*
 759         * rsnd_rdai_is_clk_master() will be enabled after set_fmt,
 760         * and, pcm_new will be called after it.
 761         * This function reuse pcm_new at this point.
 762         */
 763        rsnd_ssi_parent_attach(mod, io);
 764
 765        return 0;
 766}
 767
 768static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 769                                 struct rsnd_dai_stream *io,
 770                                 struct rsnd_priv *priv)
 771{
 772        struct device *dev = rsnd_priv_to_dev(priv);
 773        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 774        int ret = 0;
 775
 776        /*
 777         * SSIP/SSIU/IRQ are not needed on
 778         * SSI Multi slaves
 779         */
 780        if (rsnd_ssi_is_multi_slave(mod, io))
 781                return 0;
 782
 783        /*
 784         * It can't judge ssi parent at this point
 785         * see rsnd_ssi_pcm_new()
 786         */
 787
 788        /*
 789         * SSI might be called again as PIO fallback
 790         * It is easy to manual handling for IRQ request/free
 791         *
 792         * OTOH, this function might be called many times if platform is
 793         * using MIX. It needs xxx_attach() many times on xxx_probe().
 794         * Because of it, we can't control .probe/.remove calling count by
 795         * mod->status.
 796         * But it don't need to call request_irq() many times.
 797         * Let's control it by RSND_SSI_PROBED flag.
 798         */
 799        if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) {
 800                ret = request_irq(ssi->irq,
 801                                  rsnd_ssi_interrupt,
 802                                  IRQF_SHARED,
 803                                  dev_name(dev), mod);
 804
 805                rsnd_flags_set(ssi, RSND_SSI_PROBED);
 806        }
 807
 808        return ret;
 809}
 810
 811static int rsnd_ssi_common_remove(struct rsnd_mod *mod,
 812                                  struct rsnd_dai_stream *io,
 813                                  struct rsnd_priv *priv)
 814{
 815        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 816        struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io);
 817
 818        /* Do nothing if non SSI (= SSI parent, multi SSI) mod */
 819        if (pure_ssi_mod != mod)
 820                return 0;
 821
 822        /* PIO will request IRQ again */
 823        if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) {
 824                free_irq(ssi->irq, mod);
 825
 826                rsnd_flags_del(ssi, RSND_SSI_PROBED);
 827        }
 828
 829        return 0;
 830}
 831
 832/*
 833 *      SSI PIO functions
 834 */
 835static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod,
 836                                   struct rsnd_dai_stream *io)
 837{
 838        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 839        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 840        u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos);
 841        int shift = 0;
 842        int byte_pos;
 843        bool elapsed = false;
 844
 845        if (snd_pcm_format_width(runtime->format) == 24)
 846                shift = 8;
 847
 848        /*
 849         * 8/16/32 data can be assesse to TDR/RDR register
 850         * directly as 32bit data
 851         * see rsnd_ssi_init()
 852         */
 853        if (rsnd_io_is_play(io))
 854                rsnd_mod_write(mod, SSITDR, (*buf) << shift);
 855        else
 856                *buf = (rsnd_mod_read(mod, SSIRDR) >> shift);
 857
 858        byte_pos = ssi->byte_pos + sizeof(*buf);
 859
 860        if (byte_pos >= ssi->next_period_byte) {
 861                int period_pos = byte_pos / ssi->byte_per_period;
 862
 863                if (period_pos >= runtime->periods) {
 864                        byte_pos = 0;
 865                        period_pos = 0;
 866                }
 867
 868                ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period;
 869
 870                elapsed = true;
 871        }
 872
 873        WRITE_ONCE(ssi->byte_pos, byte_pos);
 874
 875        return elapsed;
 876}
 877
 878static int rsnd_ssi_pio_init(struct rsnd_mod *mod,
 879                             struct rsnd_dai_stream *io,
 880                             struct rsnd_priv *priv)
 881{
 882        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 883        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 884
 885        if (!rsnd_ssi_is_parent(mod, io)) {
 886                ssi->byte_pos           = 0;
 887                ssi->byte_per_period    = runtime->period_size *
 888                                          runtime->channels *
 889                                          samples_to_bytes(runtime, 1);
 890                ssi->next_period_byte   = ssi->byte_per_period;
 891        }
 892
 893        return rsnd_ssi_init(mod, io, priv);
 894}
 895
 896static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod,
 897                            struct rsnd_dai_stream *io,
 898                            snd_pcm_uframes_t *pointer)
 899{
 900        struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 901        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 902
 903        *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos));
 904
 905        return 0;
 906}
 907
 908static int rsnd_ssi_prepare(struct rsnd_mod *mod,
 909                            struct rsnd_dai_stream *io,
 910                            struct rsnd_priv *priv)
 911{
 912        return rsnd_ssi_master_clk_start(mod, io);
 913}
 914
 915static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
 916        .name           = SSI_NAME,
 917        .probe          = rsnd_ssi_common_probe,
 918        .remove         = rsnd_ssi_common_remove,
 919        .init           = rsnd_ssi_pio_init,
 920        .quit           = rsnd_ssi_quit,
 921        .start          = rsnd_ssi_start,
 922        .stop           = rsnd_ssi_stop,
 923        .irq            = rsnd_ssi_irq,
 924        .pointer        = rsnd_ssi_pio_pointer,
 925        .pcm_new        = rsnd_ssi_pcm_new,
 926        .hw_params      = rsnd_ssi_hw_params,
 927        .prepare        = rsnd_ssi_prepare,
 928        .get_status     = rsnd_ssi_get_status,
 929};
 930
 931static int rsnd_ssi_dma_probe(struct rsnd_mod *mod,
 932                              struct rsnd_dai_stream *io,
 933                              struct rsnd_priv *priv)
 934{
 935        int ret;
 936
 937        /*
 938         * SSIP/SSIU/IRQ/DMA are not needed on
 939         * SSI Multi slaves
 940         */
 941        if (rsnd_ssi_is_multi_slave(mod, io))
 942                return 0;
 943
 944        ret = rsnd_ssi_common_probe(mod, io, priv);
 945        if (ret)
 946                return ret;
 947
 948        /* SSI probe might be called many times in MUX multi path */
 949        ret = rsnd_dma_attach(io, mod, &io->dma);
 950
 951        return ret;
 952}
 953
 954static int rsnd_ssi_fallback(struct rsnd_mod *mod,
 955                             struct rsnd_dai_stream *io,
 956                             struct rsnd_priv *priv)
 957{
 958        struct device *dev = rsnd_priv_to_dev(priv);
 959
 960        /*
 961         * fallback to PIO
 962         *
 963         * SSI .probe might be called again.
 964         * see
 965         *      rsnd_rdai_continuance_probe()
 966         */
 967        mod->ops = &rsnd_ssi_pio_ops;
 968
 969        dev_info(dev, "%s fallback to PIO mode\n", rsnd_mod_name(mod));
 970
 971        return 0;
 972}
 973
 974static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 975                                         struct rsnd_mod *mod)
 976{
 977        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 978        int is_play = rsnd_io_is_play(io);
 979        char *name;
 980
 981        /*
 982         * It should use "rcar_sound,ssiu" on DT.
 983         * But, we need to keep compatibility for old version.
 984         *
 985         * If it has "rcar_sound.ssiu", it will be used.
 986         * If not, "rcar_sound.ssi" will be used.
 987         * see
 988         *      rsnd_ssiu_dma_req()
 989         *      rsnd_dma_of_path()
 990         */
 991
 992        if (rsnd_ssi_use_busif(io))
 993                name = is_play ? "rxu" : "txu";
 994        else
 995                name = is_play ? "rx" : "tx";
 996
 997        return rsnd_dma_request_channel(rsnd_ssi_of_node(priv),
 998                                        mod, name);
 999}
1000
1001static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
1002        .name           = SSI_NAME,
1003        .dma_req        = rsnd_ssi_dma_req,
1004        .probe          = rsnd_ssi_dma_probe,
1005        .remove         = rsnd_ssi_common_remove,
1006        .init           = rsnd_ssi_init,
1007        .quit           = rsnd_ssi_quit,
1008        .start          = rsnd_ssi_start,
1009        .stop           = rsnd_ssi_stop,
1010        .irq            = rsnd_ssi_irq,
1011        .pcm_new        = rsnd_ssi_pcm_new,
1012        .fallback       = rsnd_ssi_fallback,
1013        .hw_params      = rsnd_ssi_hw_params,
1014        .prepare        = rsnd_ssi_prepare,
1015        .get_status     = rsnd_ssi_get_status,
1016};
1017
1018static int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
1019{
1020        return mod->ops == &rsnd_ssi_dma_ops;
1021}
1022
1023/*
1024 *              ssi mod function
1025 */
1026static void rsnd_ssi_connect(struct rsnd_mod *mod,
1027                             struct rsnd_dai_stream *io)
1028{
1029        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
1030        enum rsnd_mod_type types[] = {
1031                RSND_MOD_SSI,
1032                RSND_MOD_SSIM1,
1033                RSND_MOD_SSIM2,
1034                RSND_MOD_SSIM3,
1035        };
1036        enum rsnd_mod_type type;
1037        int i;
1038
1039        /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */
1040        for (i = 0; i < ARRAY_SIZE(types); i++) {
1041                type = types[i];
1042                if (!rsnd_io_to_mod(io, type)) {
1043                        rsnd_dai_connect(mod, io, type);
1044                        rsnd_rdai_channels_set(rdai, (i + 1) * 2);
1045                        rsnd_rdai_ssi_lane_set(rdai, (i + 1));
1046                        return;
1047                }
1048        }
1049}
1050
1051void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
1052                            struct device_node *playback,
1053                            struct device_node *capture)
1054{
1055        struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
1056        struct device_node *node;
1057        struct device_node *np;
1058        struct rsnd_mod *mod;
1059        int i;
1060
1061        node = rsnd_ssi_of_node(priv);
1062        if (!node)
1063                return;
1064
1065        i = 0;
1066        for_each_child_of_node(node, np) {
1067                mod = rsnd_ssi_mod_get(priv, i);
1068                if (np == playback)
1069                        rsnd_ssi_connect(mod, &rdai->playback);
1070                if (np == capture)
1071                        rsnd_ssi_connect(mod, &rdai->capture);
1072                i++;
1073        }
1074
1075        of_node_put(node);
1076}
1077
1078struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
1079{
1080        if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))
1081                id = 0;
1082
1083        return rsnd_mod_get(rsnd_ssi_get(priv, id));
1084}
1085
1086int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod)
1087{
1088        if (!mod)
1089                return 0;
1090
1091        return !!(rsnd_flags_has(rsnd_mod_to_ssi(mod), RSND_SSI_CLK_PIN_SHARE));
1092}
1093
1094int rsnd_ssi_probe(struct rsnd_priv *priv)
1095{
1096        struct device_node *node;
1097        struct device_node *np;
1098        struct device *dev = rsnd_priv_to_dev(priv);
1099        struct rsnd_mod_ops *ops;
1100        struct clk *clk;
1101        struct rsnd_ssi *ssi;
1102        char name[RSND_SSI_NAME_SIZE];
1103        int i, nr, ret;
1104
1105        node = rsnd_ssi_of_node(priv);
1106        if (!node)
1107                return -EINVAL;
1108
1109        nr = of_get_child_count(node);
1110        if (!nr) {
1111                ret = -EINVAL;
1112                goto rsnd_ssi_probe_done;
1113        }
1114
1115        ssi     = devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL);
1116        if (!ssi) {
1117                ret = -ENOMEM;
1118                goto rsnd_ssi_probe_done;
1119        }
1120
1121        priv->ssi       = ssi;
1122        priv->ssi_nr    = nr;
1123
1124        i = 0;
1125        for_each_child_of_node(node, np) {
1126                if (!of_device_is_available(np))
1127                        goto skip;
1128
1129                ssi = rsnd_ssi_get(priv, i);
1130
1131                snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d",
1132                         SSI_NAME, i);
1133
1134                clk = devm_clk_get(dev, name);
1135                if (IS_ERR(clk)) {
1136                        ret = PTR_ERR(clk);
1137                        of_node_put(np);
1138                        goto rsnd_ssi_probe_done;
1139                }
1140
1141                if (of_get_property(np, "shared-pin", NULL))
1142                        rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE);
1143
1144                if (of_get_property(np, "no-busif", NULL))
1145                        rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF);
1146
1147                ssi->irq = irq_of_parse_and_map(np, 0);
1148                if (!ssi->irq) {
1149                        ret = -EINVAL;
1150                        of_node_put(np);
1151                        goto rsnd_ssi_probe_done;
1152                }
1153
1154                if (of_property_read_bool(np, "pio-transfer"))
1155                        ops = &rsnd_ssi_pio_ops;
1156                else
1157                        ops = &rsnd_ssi_dma_ops;
1158
1159                ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk,
1160                                    RSND_MOD_SSI, i);
1161                if (ret) {
1162                        of_node_put(np);
1163                        goto rsnd_ssi_probe_done;
1164                }
1165skip:
1166                i++;
1167        }
1168
1169        ret = 0;
1170
1171rsnd_ssi_probe_done:
1172        of_node_put(node);
1173
1174        return ret;
1175}
1176
1177void rsnd_ssi_remove(struct rsnd_priv *priv)
1178{
1179        struct rsnd_ssi *ssi;
1180        int i;
1181
1182        for_each_rsnd_ssi(ssi, priv, i) {
1183                rsnd_mod_quit(rsnd_mod_get(ssi));
1184        }
1185}
1186