sound/soc/rockchip/rockchip_pdm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
   4  *
   5  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/clk.h>
  10 #include <linux/of.h>
  11 #include <linux/pm_runtime.h>
  12 #include <linux/rational.h>
  13 #include <linux/regmap.h>
  14 #include <linux/reset.h>
  15 #include <sound/dmaengine_pcm.h>
  16 #include <sound/pcm_params.h>
  17
  18 #include "rockchip_pdm.h"
  19
  20 #define PDM_DMA_BURST_SIZE      (8) /* size * width: 8*4 = 32 bytes */
  21 #define PDM_SIGNOFF_CLK_RATE    (100000000)
  22 #define PDM_PATH_MAX            (4)
  23
  24 enum rk_pdm_version {
  25         RK_PDM_RK3229,
  26         RK_PDM_RK3308,
  27         RK_PDM_RV1126,
  28 };
  29
  30 struct rk_pdm_dev {
  31         struct device *dev;
  32         struct clk *clk;
  33         struct clk *hclk;
  34         struct regmap *regmap;
  35         struct snd_dmaengine_dai_dma_data capture_dma_data;
  36         struct reset_control *reset;
  37         enum rk_pdm_version version;
  38 };
  39
  40 struct rk_pdm_clkref {
  41         unsigned int sr;
  42         unsigned int clk;
  43         unsigned int clk_out;
  44 };
  45
  46 struct rk_pdm_ds_ratio {
  47         unsigned int ratio;
  48         unsigned int sr;
  49 };
  50
  51 static struct rk_pdm_clkref clkref[] = {
  52         { 8000, 40960000, 2048000 },
  53         { 11025, 56448000, 2822400 },
  54         { 12000, 61440000, 3072000 },
  55         { 8000, 98304000, 2048000 },
  56         { 12000, 98304000, 3072000 },
  57 };
  58
  59 static struct rk_pdm_ds_ratio ds_ratio[] = {
  60         { 0, 192000 },
  61         { 0, 176400 },
  62         { 0, 128000 },
  63         { 1, 96000 },
  64         { 1, 88200 },
  65         { 1, 64000 },
  66         { 2, 48000 },
  67         { 2, 44100 },
  68         { 2, 32000 },
  69         { 3, 24000 },
  70         { 3, 22050 },
  71         { 3, 16000 },
  72         { 4, 12000 },
  73         { 4, 11025 },
  74         { 4, 8000 },
  75 };
  76
  77 static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
  78                                 unsigned int *clk_src, unsigned int *clk_out)
  79 {
  80         unsigned int i, count, clk, div, rate;
  81
  82         clk = 0;
  83         if (!sr)
  84                 return clk;
  85
  86         count = ARRAY_SIZE(clkref);
  87         for (i = 0; i < count; i++) {
  88                 if (sr % clkref[i].sr)
  89                         continue;
  90                 div = sr / clkref[i].sr;
  91                 if ((div & (div - 1)) == 0) {
  92                         *clk_out = clkref[i].clk_out;
  93                         rate = clk_round_rate(pdm->clk, clkref[i].clk);
  94                         if (rate != clkref[i].clk)
  95                                 continue;
  96                         clk = clkref[i].clk;
  97                         *clk_src = clkref[i].clk;
  98                         break;
  99                 }
 100         }
 101
 102         if (!clk) {
 103                 clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
 104                 *clk_src = clk;
 105         }
 106         return clk;
 107 }
 108
 109 static unsigned int get_pdm_ds_ratio(unsigned int sr)
 110 {
 111         unsigned int i, count, ratio;
 112
 113         ratio = 0;
 114         if (!sr)
 115                 return ratio;
 116
 117         count = ARRAY_SIZE(ds_ratio);
 118         for (i = 0; i < count; i++) {
 119                 if (sr == ds_ratio[i].sr)
 120                         ratio = ds_ratio[i].ratio;
 121         }
 122         return ratio;
 123 }
 124
 125 static unsigned int get_pdm_cic_ratio(unsigned int clk)
 126 {
 127         switch (clk) {
 128         case 4096000:
 129         case 5644800:
 130         case 6144000:
 131                 return 0;
 132         case 2048000:
 133         case 2822400:
 134         case 3072000:
 135                 return 1;
 136         case 1024000:
 137         case 1411200:
 138         case 1536000:
 139                 return 2;
 140         default:
 141                 return 1;
 142         }
 143 }
 144
 145 static unsigned int samplerate_to_bit(unsigned int samplerate)
 146 {
 147         switch (samplerate) {
 148         case 8000:
 149         case 11025:
 150         case 12000:
 151                 return 0;
 152         case 16000:
 153         case 22050:
 154         case 24000:
 155                 return 1;
 156         case 32000:
 157                 return 2;
 158         case 44100:
 159         case 48000:
 160                 return 3;
 161         case 64000:
 162         case 88200:
 163         case 96000:
 164                 return 4;
 165         case 128000:
 166         case 176400:
 167         case 192000:
 168                 return 5;
 169         default:
 170                 return 1;
 171         }
 172 }
 173
 174 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
 175 {
 176         return snd_soc_dai_get_drvdata(dai);
 177 }
 178
 179 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
 180 {
 181         if (on) {
 182                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 183                                    PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
 184                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 185                                    PDM_RX_MASK, PDM_RX_START);
 186         } else {
 187                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 188                                    PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
 189                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 190                                    PDM_RX_MASK | PDM_RX_CLR_MASK,
 191                                    PDM_RX_STOP | PDM_RX_CLR_WR);
 192         }
 193 }
 194
 195 static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
 196                                   struct snd_pcm_hw_params *params,
 197                                   struct snd_soc_dai *dai)
 198 {
 199         struct rk_pdm_dev *pdm = to_info(dai);
 200         unsigned int val = 0;
 201         unsigned int clk_rate, clk_div, samplerate;
 202         unsigned int clk_src, clk_out = 0;
 203         unsigned long m, n;
 204         bool change;
 205         int ret;
 206
 207         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 208                 return 0;
 209
 210         samplerate = params_rate(params);
 211         clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
 212         if (!clk_rate)
 213                 return -EINVAL;
 214
 215         ret = clk_set_rate(pdm->clk, clk_src);
 216         if (ret)
 217                 return -EINVAL;
 218
 219         if (pdm->version == RK_PDM_RK3308 ||
 220             pdm->version == RK_PDM_RV1126) {
 221                 rational_best_approximation(clk_out, clk_src,
 222                                             GENMASK(16 - 1, 0),
 223                                             GENMASK(16 - 1, 0),
 224                                             &m, &n);
 225
 226                 val = (m << PDM_FD_NUMERATOR_SFT) |
 227                         (n << PDM_FD_DENOMINATOR_SFT);
 228                 regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
 229                                          PDM_FD_NUMERATOR_MSK |
 230                                          PDM_FD_DENOMINATOR_MSK,
 231                                          val, &change);
 232                 if (change) {
 233                         reset_control_assert(pdm->reset);
 234                         reset_control_deassert(pdm->reset);
 235                         rockchip_pdm_rxctrl(pdm, 0);
 236                 }
 237                 clk_div = n / m;
 238                 if (clk_div >= 40)
 239                         val = PDM_CLK_FD_RATIO_40;
 240                 else if (clk_div <= 35)
 241                         val = PDM_CLK_FD_RATIO_35;
 242                 else
 243                         return -EINVAL;
 244                 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
 245                                    PDM_CLK_FD_RATIO_MSK,
 246                                    val);
 247         }
 248
 249         if (pdm->version == RK_PDM_RV1126) {
 250                 val = get_pdm_cic_ratio(clk_out);
 251                 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CIC_RATIO_MSK, val);
 252                 val = samplerate_to_bit(samplerate);
 253                 regmap_update_bits(pdm->regmap, PDM_CTRL0,
 254                                    PDM_SAMPLERATE_MSK, PDM_SAMPLERATE(val));
 255         } else {
 256                 val = get_pdm_ds_ratio(samplerate);
 257                 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
 258         }
 259
 260         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 261                            PDM_HPF_CF_MSK, PDM_HPF_60HZ);
 262         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 263                            PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
 264         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
 265         if (pdm->version != RK_PDM_RK3229)
 266                 regmap_update_bits(pdm->regmap, PDM_CTRL0,
 267                                    PDM_MODE_MSK, PDM_MODE_LJ);
 268
 269         val = 0;
 270         switch (params_format(params)) {
 271         case SNDRV_PCM_FORMAT_S8:
 272                 val |= PDM_VDW(8);
 273                 break;
 274         case SNDRV_PCM_FORMAT_S16_LE:
 275                 val |= PDM_VDW(16);
 276                 break;
 277         case SNDRV_PCM_FORMAT_S20_3LE:
 278                 val |= PDM_VDW(20);
 279                 break;
 280         case SNDRV_PCM_FORMAT_S24_LE:
 281                 val |= PDM_VDW(24);
 282                 break;
 283         case SNDRV_PCM_FORMAT_S32_LE:
 284                 val |= PDM_VDW(32);
 285                 break;
 286         default:
 287                 return -EINVAL;
 288         }
 289
 290         switch (params_channels(params)) {
 291         case 8:
 292                 val |= PDM_PATH3_EN;
 293                 fallthrough;
 294         case 6:
 295                 val |= PDM_PATH2_EN;
 296                 fallthrough;
 297         case 4:
 298                 val |= PDM_PATH1_EN;
 299                 fallthrough;
 300         case 2:
 301                 val |= PDM_PATH0_EN;
 302                 break;
 303         default:
 304                 dev_err(pdm->dev, "invalid channel: %d\n",
 305                         params_channels(params));
 306                 return -EINVAL;
 307         }
 308
 309         regmap_update_bits(pdm->regmap, PDM_CTRL0,
 310                            PDM_PATH_MSK | PDM_VDW_MSK,
 311                            val);
 312         /* all channels share the single FIFO */
 313         regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
 314                            PDM_DMA_RDL(8 * params_channels(params)));
 315
 316         return 0;
 317 }
 318
 319 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
 320                                 unsigned int fmt)
 321 {
 322         struct rk_pdm_dev *pdm = to_info(cpu_dai);
 323         unsigned int mask = 0, val = 0;
 324
 325         mask = PDM_CKP_MSK;
 326         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 327         case SND_SOC_DAIFMT_NB_NF:
 328                 val = PDM_CKP_NORMAL;
 329                 break;
 330         case SND_SOC_DAIFMT_IB_NF:
 331                 val = PDM_CKP_INVERTED;
 332                 break;
 333         default:
 334                 return -EINVAL;
 335         }
 336
 337         pm_runtime_get_sync(cpu_dai->dev);
 338         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
 339         pm_runtime_put(cpu_dai->dev);
 340
 341         return 0;
 342 }
 343
 344 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
 345                                 struct snd_soc_dai *dai)
 346 {
 347         struct rk_pdm_dev *pdm = to_info(dai);
 348         int ret = 0;
 349
 350         switch (cmd) {
 351         case SNDRV_PCM_TRIGGER_START:
 352         case SNDRV_PCM_TRIGGER_RESUME:
 353         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 354                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 355                         rockchip_pdm_rxctrl(pdm, 1);
 356                 break;
 357         case SNDRV_PCM_TRIGGER_SUSPEND:
 358         case SNDRV_PCM_TRIGGER_STOP:
 359         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 360                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 361                         rockchip_pdm_rxctrl(pdm, 0);
 362                 break;
 363         default:
 364                 ret = -EINVAL;
 365                 break;
 366         }
 367
 368         return ret;
 369 }
 370
 371 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
 372 {
 373         struct rk_pdm_dev *pdm = to_info(dai);
 374
 375         snd_soc_dai_dma_data_set_capture(dai, &pdm->capture_dma_data);
 376
 377         return 0;
 378 }
 379
 380 static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
 381         .probe = rockchip_pdm_dai_probe,
 382         .set_fmt = rockchip_pdm_set_fmt,
 383         .trigger = rockchip_pdm_trigger,
 384         .hw_params = rockchip_pdm_hw_params,
 385 };
 386
 387 #define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
 388 #define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 389                               SNDRV_PCM_FMTBIT_S20_3LE | \
 390                               SNDRV_PCM_FMTBIT_S24_LE | \
 391                               SNDRV_PCM_FMTBIT_S32_LE)
 392
 393 static struct snd_soc_dai_driver rockchip_pdm_dai = {
 394         .capture = {
 395                 .stream_name = "Capture",
 396                 .channels_min = 2,
 397                 .channels_max = 8,
 398                 .rates = ROCKCHIP_PDM_RATES,
 399                 .formats = ROCKCHIP_PDM_FORMATS,
 400         },
 401         .ops = &rockchip_pdm_dai_ops,
 402         .symmetric_rate = 1,
 403 };
 404
 405 static const struct snd_soc_component_driver rockchip_pdm_component = {
 406         .name = "rockchip-pdm",
 407         .legacy_dai_naming = 1,
 408 };
 409
 410 static int rockchip_pdm_runtime_suspend(struct device *dev)
 411 {
 412         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 413
 414         clk_disable_unprepare(pdm->clk);
 415         clk_disable_unprepare(pdm->hclk);
 416
 417         return 0;
 418 }
 419
 420 static int rockchip_pdm_runtime_resume(struct device *dev)
 421 {
 422         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 423         int ret;
 424
 425         ret = clk_prepare_enable(pdm->clk);
 426         if (ret) {
 427                 dev_err(pdm->dev, "clock enable failed %d\n", ret);
 428                 return ret;
 429         }
 430
 431         ret = clk_prepare_enable(pdm->hclk);
 432         if (ret) {
 433                 clk_disable_unprepare(pdm->clk);
 434                 dev_err(pdm->dev, "hclock enable failed %d\n", ret);
 435                 return ret;
 436         }
 437
 438         return 0;
 439 }
 440
 441 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
 442 {
 443         switch (reg) {
 444         case PDM_SYSCONFIG:
 445         case PDM_CTRL0:
 446         case PDM_CTRL1:
 447         case PDM_CLK_CTRL:
 448         case PDM_HPF_CTRL:
 449         case PDM_FIFO_CTRL:
 450         case PDM_DMA_CTRL:
 451         case PDM_INT_EN:
 452         case PDM_INT_CLR:
 453         case PDM_DATA_VALID:
 454                 return true;
 455         default:
 456                 return false;
 457         }
 458 }
 459
 460 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
 461 {
 462         switch (reg) {
 463         case PDM_SYSCONFIG:
 464         case PDM_CTRL0:
 465         case PDM_CTRL1:
 466         case PDM_CLK_CTRL:
 467         case PDM_HPF_CTRL:
 468         case PDM_FIFO_CTRL:
 469         case PDM_DMA_CTRL:
 470         case PDM_INT_EN:
 471         case PDM_INT_CLR:
 472         case PDM_INT_ST:
 473         case PDM_DATA_VALID:
 474         case PDM_RXFIFO_DATA:
 475         case PDM_VERSION:
 476                 return true;
 477         default:
 478                 return false;
 479         }
 480 }
 481
 482 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
 483 {
 484         switch (reg) {
 485         case PDM_SYSCONFIG:
 486         case PDM_FIFO_CTRL:
 487         case PDM_INT_CLR:
 488         case PDM_INT_ST:
 489         case PDM_RXFIFO_DATA:
 490                 return true;
 491         default:
 492                 return false;
 493         }
 494 }
 495
 496 static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
 497 {
 498         switch (reg) {
 499         case PDM_RXFIFO_DATA:
 500                 return true;
 501         default:
 502                 return false;
 503         }
 504 }
 505
 506 static const struct reg_default rockchip_pdm_reg_defaults[] = {
 507         { PDM_CTRL0, 0x78000017 },
 508         { PDM_CTRL1, 0x0bb8ea60 },
 509         { PDM_CLK_CTRL, 0x0000e401 },
 510         { PDM_DMA_CTRL, 0x0000001f },
 511 };
 512
 513 static const struct regmap_config rockchip_pdm_regmap_config = {
 514         .reg_bits = 32,
 515         .reg_stride = 4,
 516         .val_bits = 32,
 517         .max_register = PDM_VERSION,
 518         .reg_defaults = rockchip_pdm_reg_defaults,
 519         .num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
 520         .writeable_reg = rockchip_pdm_wr_reg,
 521         .readable_reg = rockchip_pdm_rd_reg,
 522         .volatile_reg = rockchip_pdm_volatile_reg,
 523         .precious_reg = rockchip_pdm_precious_reg,
 524         .cache_type = REGCACHE_FLAT,
 525 };
 526
 527 static const struct of_device_id rockchip_pdm_match[] __maybe_unused = {
 528         { .compatible = "rockchip,pdm",
 529           .data = (void *)RK_PDM_RK3229 },
 530         { .compatible = "rockchip,px30-pdm",
 531           .data = (void *)RK_PDM_RK3308 },
 532         { .compatible = "rockchip,rk1808-pdm",
 533           .data = (void *)RK_PDM_RK3308 },
 534         { .compatible = "rockchip,rk3308-pdm",
 535           .data = (void *)RK_PDM_RK3308 },
 536         { .compatible = "rockchip,rk3568-pdm",
 537           .data = (void *)RK_PDM_RV1126 },
 538         { .compatible = "rockchip,rv1126-pdm",
 539           .data = (void *)RK_PDM_RV1126 },
 540         {},
 541 };
 542 MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
 543
 544 static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *node)
 545 {
 546         unsigned int path[PDM_PATH_MAX];
 547         int cnt = 0, ret = 0, i = 0, val = 0, msk = 0;
 548
 549         cnt = of_count_phandle_with_args(node, "rockchip,path-map",
 550                                          NULL);
 551         if (cnt != PDM_PATH_MAX)
 552                 return cnt;
 553
 554         ret = of_property_read_u32_array(node, "rockchip,path-map",
 555                                          path, cnt);
 556         if (ret)
 557                 return ret;
 558
 559         for (i = 0; i < cnt; i++) {
 560                 if (path[i] >= PDM_PATH_MAX)
 561                         return -EINVAL;
 562                 msk |= PDM_PATH_MASK(i);
 563                 val |= PDM_PATH(i, path[i]);
 564         }
 565
 566         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, msk, val);
 567
 568         return 0;
 569 }
 570
 571 static int rockchip_pdm_probe(struct platform_device *pdev)
 572 {
 573         struct device_node *node = pdev->dev.of_node;
 574         struct rk_pdm_dev *pdm;
 575         struct resource *res;
 576         void __iomem *regs;
 577         int ret;
 578
 579         pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
 580         if (!pdm)
 581                 return -ENOMEM;
 582
 583         pdm->version = (enum rk_pdm_version)device_get_match_data(&pdev->dev);
 584         if (pdm->version == RK_PDM_RK3308) {
 585                 pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
 586                 if (IS_ERR(pdm->reset))
 587                         return PTR_ERR(pdm->reset);
 588         }
 589
 590         regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 591         if (IS_ERR(regs))
 592                 return PTR_ERR(regs);
 593
 594         pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 595                                             &rockchip_pdm_regmap_config);
 596         if (IS_ERR(pdm->regmap))
 597                 return PTR_ERR(pdm->regmap);
 598
 599         pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
 600         pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 601         pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
 602
 603         pdm->dev = &pdev->dev;
 604         dev_set_drvdata(&pdev->dev, pdm);
 605
 606         pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
 607         if (IS_ERR(pdm->clk))
 608                 return PTR_ERR(pdm->clk);
 609
 610         pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
 611         if (IS_ERR(pdm->hclk))
 612                 return PTR_ERR(pdm->hclk);
 613
 614         ret = clk_prepare_enable(pdm->hclk);
 615         if (ret)
 616                 return ret;
 617
 618         pm_runtime_enable(&pdev->dev);
 619         if (!pm_runtime_enabled(&pdev->dev)) {
 620                 ret = rockchip_pdm_runtime_resume(&pdev->dev);
 621                 if (ret)
 622                         goto err_pm_disable;
 623         }
 624
 625         ret = devm_snd_soc_register_component(&pdev->dev,
 626                                               &rockchip_pdm_component,
 627                                               &rockchip_pdm_dai, 1);
 628
 629         if (ret) {
 630                 dev_err(&pdev->dev, "could not register dai: %d\n", ret);
 631                 goto err_suspend;
 632         }
 633
 634         rockchip_pdm_rxctrl(pdm, 0);
 635
 636         ret = rockchip_pdm_path_parse(pdm, node);
 637         if (ret != 0 && ret != -ENOENT)
 638                 goto err_suspend;
 639
 640         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 641         if (ret) {
 642                 dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
 643                 goto err_suspend;
 644         }
 645
 646         return 0;
 647
 648 err_suspend:
 649         if (!pm_runtime_status_suspended(&pdev->dev))
 650                 rockchip_pdm_runtime_suspend(&pdev->dev);
 651 err_pm_disable:
 652         pm_runtime_disable(&pdev->dev);
 653
 654         clk_disable_unprepare(pdm->hclk);
 655
 656         return ret;
 657 }
 658
 659 static void rockchip_pdm_remove(struct platform_device *pdev)
 660 {
 661         struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);
 662
 663         pm_runtime_disable(&pdev->dev);
 664         if (!pm_runtime_status_suspended(&pdev->dev))
 665                 rockchip_pdm_runtime_suspend(&pdev->dev);
 666
 667         clk_disable_unprepare(pdm->clk);
 668         clk_disable_unprepare(pdm->hclk);
 669 }
 670
 671 #ifdef CONFIG_PM_SLEEP
 672 static int rockchip_pdm_suspend(struct device *dev)
 673 {
 674         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 675
 676         regcache_mark_dirty(pdm->regmap);
 677
 678         return 0;
 679 }
 680
 681 static int rockchip_pdm_resume(struct device *dev)
 682 {
 683         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 684         int ret;
 685
 686         ret = pm_runtime_resume_and_get(dev);
 687         if (ret < 0)
 688                 return ret;
 689
 690         ret = regcache_sync(pdm->regmap);
 691
 692         pm_runtime_put(dev);
 693
 694         return ret;
 695 }
 696 #endif
 697
 698 static const struct dev_pm_ops rockchip_pdm_pm_ops = {
 699         SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
 700                            rockchip_pdm_runtime_resume, NULL)
 701         SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
 702 };
 703
 704 static struct platform_driver rockchip_pdm_driver = {
 705         .probe  = rockchip_pdm_probe,
 706         .remove = rockchip_pdm_remove,
 707         .driver = {
 708                 .name = "rockchip-pdm",
 709                 .of_match_table = of_match_ptr(rockchip_pdm_match),
 710                 .pm = &rockchip_pdm_pm_ops,
 711         },
 712 };
 713
 714 module_platform_driver(rockchip_pdm_driver);
 715
 716 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
 717 MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
 718 MODULE_LICENSE("GPL v2");