sound/soc/rockchip/rockchip_pdm.c

   1 /*
   2  * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
   3  *
   4  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/clk.h>
  19 #include <linux/of.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/regmap.h>
  22 #include <sound/dmaengine_pcm.h>
  23 #include <sound/pcm_params.h>
  24
  25 #include "rockchip_pdm.h"
  26
  27 #define PDM_DMA_BURST_SIZE      (8) /* size * width: 8*4 = 32 bytes */
  28
  29 struct rk_pdm_dev {
  30         struct device *dev;
  31         struct clk *clk;
  32         struct clk *hclk;
  33         struct regmap *regmap;
  34         struct snd_dmaengine_dai_dma_data capture_dma_data;
  35 };
  36
  37 struct rk_pdm_clkref {
  38         unsigned int sr;
  39         unsigned int clk;
  40 };
  41
  42 static struct rk_pdm_clkref clkref[] = {
  43         { 8000, 40960000 },
  44         { 11025, 56448000 },
  45         { 12000, 61440000 },
  46 };
  47
  48 static unsigned int get_pdm_clk(unsigned int sr)
  49 {
  50         unsigned int i, count, clk, div;
  51
  52         clk = 0;
  53         if (!sr)
  54                 return clk;
  55
  56         count = ARRAY_SIZE(clkref);
  57         for (i = 0; i < count; i++) {
  58                 if (sr % clkref[i].sr)
  59                         continue;
  60                 div = sr / clkref[i].sr;
  61                 if ((div & (div - 1)) == 0) {
  62                         clk = clkref[i].clk;
  63                         break;
  64                 }
  65         }
  66
  67         return clk;
  68 }
  69
  70 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
  71 {
  72         return snd_soc_dai_get_drvdata(dai);
  73 }
  74
  75 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
  76 {
  77         if (on) {
  78                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
  79                                    PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
  80                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
  81                                    PDM_RX_MASK, PDM_RX_START);
  82         } else {
  83                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
  84                                    PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
  85                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
  86                                    PDM_RX_MASK | PDM_RX_CLR_MASK,
  87                                    PDM_RX_STOP | PDM_RX_CLR_WR);
  88         }
  89 }
  90
  91 static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
  92                                   struct snd_pcm_hw_params *params,
  93                                   struct snd_soc_dai *dai)
  94 {
  95         struct rk_pdm_dev *pdm = to_info(dai);
  96         unsigned int val = 0;
  97         unsigned int clk_rate, clk_div, samplerate;
  98         int ret;
  99
 100         samplerate = params_rate(params);
 101         clk_rate = get_pdm_clk(samplerate);
 102         if (!clk_rate)
 103                 return -EINVAL;
 104
 105         ret = clk_set_rate(pdm->clk, clk_rate);
 106         if (ret)
 107                 return -EINVAL;
 108
 109         clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
 110
 111         switch (clk_div) {
 112         case 320:
 113                 val = PDM_CLK_320FS;
 114                 break;
 115         case 640:
 116                 val = PDM_CLK_640FS;
 117                 break;
 118         case 1280:
 119                 val = PDM_CLK_1280FS;
 120                 break;
 121         case 2560:
 122                 val = PDM_CLK_2560FS;
 123                 break;
 124         case 5120:
 125                 val = PDM_CLK_5120FS;
 126                 break;
 127         default:
 128                 dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
 129                 return -EINVAL;
 130         }
 131
 132         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
 133         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 134                            PDM_HPF_CF_MSK, PDM_HPF_60HZ);
 135         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 136                            PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
 137         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
 138
 139         val = 0;
 140         switch (params_format(params)) {
 141         case SNDRV_PCM_FORMAT_S8:
 142                 val |= PDM_VDW(8);
 143                 break;
 144         case SNDRV_PCM_FORMAT_S16_LE:
 145                 val |= PDM_VDW(16);
 146                 break;
 147         case SNDRV_PCM_FORMAT_S20_3LE:
 148                 val |= PDM_VDW(20);
 149                 break;
 150         case SNDRV_PCM_FORMAT_S24_LE:
 151                 val |= PDM_VDW(24);
 152                 break;
 153         case SNDRV_PCM_FORMAT_S32_LE:
 154                 val |= PDM_VDW(32);
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159
 160         switch (params_channels(params)) {
 161         case 8:
 162                 val |= PDM_PATH3_EN;
 163                 /* fallthrough */
 164         case 6:
 165                 val |= PDM_PATH2_EN;
 166                 /* fallthrough */
 167         case 4:
 168                 val |= PDM_PATH1_EN;
 169                 /* fallthrough */
 170         case 2:
 171                 val |= PDM_PATH0_EN;
 172                 break;
 173         default:
 174                 dev_err(pdm->dev, "invalid channel: %d\n",
 175                         params_channels(params));
 176                 return -EINVAL;
 177         }
 178
 179         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 180                 regmap_update_bits(pdm->regmap, PDM_CTRL0,
 181                                    PDM_PATH_MSK | PDM_VDW_MSK,
 182                                    val);
 183                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
 184                                    PDM_DMA_RDL(16));
 185                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 186                                    PDM_RX_MASK | PDM_RX_CLR_MASK,
 187                                    PDM_RX_STOP | PDM_RX_CLR_WR);
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
 194                                 unsigned int fmt)
 195 {
 196         struct rk_pdm_dev *pdm = to_info(cpu_dai);
 197         unsigned int mask = 0, val = 0;
 198
 199         mask = PDM_CKP_MSK;
 200         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 201         case SND_SOC_DAIFMT_NB_NF:
 202                 val = PDM_CKP_NORMAL;
 203                 break;
 204         case SND_SOC_DAIFMT_IB_NF:
 205                 val = PDM_CKP_INVERTED;
 206                 break;
 207         default:
 208                 return -EINVAL;
 209         }
 210
 211         pm_runtime_get_sync(cpu_dai->dev);
 212         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
 213         pm_runtime_put(cpu_dai->dev);
 214
 215         return 0;
 216 }
 217
 218 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
 219                                 struct snd_soc_dai *dai)
 220 {
 221         struct rk_pdm_dev *pdm = to_info(dai);
 222         int ret = 0;
 223
 224         switch (cmd) {
 225         case SNDRV_PCM_TRIGGER_START:
 226         case SNDRV_PCM_TRIGGER_RESUME:
 227         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 228                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 229                         rockchip_pdm_rxctrl(pdm, 1);
 230                 break;
 231         case SNDRV_PCM_TRIGGER_SUSPEND:
 232         case SNDRV_PCM_TRIGGER_STOP:
 233         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 234                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 235                         rockchip_pdm_rxctrl(pdm, 0);
 236                 break;
 237         default:
 238                 ret = -EINVAL;
 239                 break;
 240         }
 241
 242         return ret;
 243 }
 244
 245 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
 246 {
 247         struct rk_pdm_dev *pdm = to_info(dai);
 248
 249         dai->capture_dma_data = &pdm->capture_dma_data;
 250
 251         return 0;
 252 }
 253
 254 static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
 255         .set_fmt = rockchip_pdm_set_fmt,
 256         .trigger = rockchip_pdm_trigger,
 257         .hw_params = rockchip_pdm_hw_params,
 258 };
 259
 260 #define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
 261 #define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 262                               SNDRV_PCM_FMTBIT_S20_3LE | \
 263                               SNDRV_PCM_FMTBIT_S24_LE | \
 264                               SNDRV_PCM_FMTBIT_S32_LE)
 265
 266 static struct snd_soc_dai_driver rockchip_pdm_dai = {
 267         .probe = rockchip_pdm_dai_probe,
 268         .capture = {
 269                 .stream_name = "Capture",
 270                 .channels_min = 2,
 271                 .channels_max = 8,
 272                 .rates = ROCKCHIP_PDM_RATES,
 273                 .formats = ROCKCHIP_PDM_FORMATS,
 274         },
 275         .ops = &rockchip_pdm_dai_ops,
 276         .symmetric_rates = 1,
 277 };
 278
 279 static const struct snd_soc_component_driver rockchip_pdm_component = {
 280         .name = "rockchip-pdm",
 281 };
 282
 283 static int rockchip_pdm_runtime_suspend(struct device *dev)
 284 {
 285         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 286
 287         clk_disable_unprepare(pdm->clk);
 288         clk_disable_unprepare(pdm->hclk);
 289
 290         return 0;
 291 }
 292
 293 static int rockchip_pdm_runtime_resume(struct device *dev)
 294 {
 295         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 296         int ret;
 297
 298         ret = clk_prepare_enable(pdm->clk);
 299         if (ret) {
 300                 dev_err(pdm->dev, "clock enable failed %d\n", ret);
 301                 return ret;
 302         }
 303
 304         ret = clk_prepare_enable(pdm->hclk);
 305         if (ret) {
 306                 dev_err(pdm->dev, "hclock enable failed %d\n", ret);
 307                 return ret;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
 314 {
 315         switch (reg) {
 316         case PDM_SYSCONFIG:
 317         case PDM_CTRL0:
 318         case PDM_CTRL1:
 319         case PDM_CLK_CTRL:
 320         case PDM_HPF_CTRL:
 321         case PDM_FIFO_CTRL:
 322         case PDM_DMA_CTRL:
 323         case PDM_INT_EN:
 324         case PDM_INT_CLR:
 325         case PDM_DATA_VALID:
 326                 return true;
 327         default:
 328                 return false;
 329         }
 330 }
 331
 332 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
 333 {
 334         switch (reg) {
 335         case PDM_SYSCONFIG:
 336         case PDM_CTRL0:
 337         case PDM_CTRL1:
 338         case PDM_CLK_CTRL:
 339         case PDM_HPF_CTRL:
 340         case PDM_FIFO_CTRL:
 341         case PDM_DMA_CTRL:
 342         case PDM_INT_EN:
 343         case PDM_INT_CLR:
 344         case PDM_INT_ST:
 345         case PDM_DATA_VALID:
 346         case PDM_VERSION:
 347                 return true;
 348         default:
 349                 return false;
 350         }
 351 }
 352
 353 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
 354 {
 355         switch (reg) {
 356         case PDM_SYSCONFIG:
 357         case PDM_INT_CLR:
 358         case PDM_INT_ST:
 359                 return true;
 360         default:
 361                 return false;
 362         }
 363 }
 364
 365 static const struct regmap_config rockchip_pdm_regmap_config = {
 366         .reg_bits = 32,
 367         .reg_stride = 4,
 368         .val_bits = 32,
 369         .max_register = PDM_VERSION,
 370         .writeable_reg = rockchip_pdm_wr_reg,
 371         .readable_reg = rockchip_pdm_rd_reg,
 372         .volatile_reg = rockchip_pdm_volatile_reg,
 373         .cache_type = REGCACHE_FLAT,
 374 };
 375
 376 static int rockchip_pdm_probe(struct platform_device *pdev)
 377 {
 378         struct rk_pdm_dev *pdm;
 379         struct resource *res;
 380         void __iomem *regs;
 381         int ret;
 382
 383         pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
 384         if (!pdm)
 385                 return -ENOMEM;
 386
 387         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 388         regs = devm_ioremap_resource(&pdev->dev, res);
 389         if (IS_ERR(regs))
 390                 return PTR_ERR(regs);
 391
 392         pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 393                                             &rockchip_pdm_regmap_config);
 394         if (IS_ERR(pdm->regmap))
 395                 return PTR_ERR(pdm->regmap);
 396
 397         pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
 398         pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 399         pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
 400
 401         pdm->dev = &pdev->dev;
 402         dev_set_drvdata(&pdev->dev, pdm);
 403
 404         pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
 405         if (IS_ERR(pdm->clk))
 406                 return PTR_ERR(pdm->clk);
 407
 408         pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
 409         if (IS_ERR(pdm->hclk))
 410                 return PTR_ERR(pdm->hclk);
 411
 412         ret = clk_prepare_enable(pdm->hclk);
 413         if (ret)
 414                 return ret;
 415
 416         pm_runtime_enable(&pdev->dev);
 417         if (!pm_runtime_enabled(&pdev->dev)) {
 418                 ret = rockchip_pdm_runtime_resume(&pdev->dev);
 419                 if (ret)
 420                         goto err_pm_disable;
 421         }
 422
 423         ret = devm_snd_soc_register_component(&pdev->dev,
 424                                               &rockchip_pdm_component,
 425                                               &rockchip_pdm_dai, 1);
 426
 427         if (ret) {
 428                 dev_err(&pdev->dev, "could not register dai: %d\n", ret);
 429                 goto err_suspend;
 430         }
 431
 432         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 433         if (ret) {
 434                 dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
 435                 goto err_suspend;
 436         }
 437
 438         return 0;
 439
 440 err_suspend:
 441         if (!pm_runtime_status_suspended(&pdev->dev))
 442                 rockchip_pdm_runtime_suspend(&pdev->dev);
 443 err_pm_disable:
 444         pm_runtime_disable(&pdev->dev);
 445
 446         clk_disable_unprepare(pdm->hclk);
 447
 448         return ret;
 449 }
 450
 451 static int rockchip_pdm_remove(struct platform_device *pdev)
 452 {
 453         struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);
 454
 455         pm_runtime_disable(&pdev->dev);
 456         if (!pm_runtime_status_suspended(&pdev->dev))
 457                 rockchip_pdm_runtime_suspend(&pdev->dev);
 458
 459         clk_disable_unprepare(pdm->clk);
 460         clk_disable_unprepare(pdm->hclk);
 461
 462         return 0;
 463 }
 464
 465 #ifdef CONFIG_PM_SLEEP
 466 static int rockchip_pdm_suspend(struct device *dev)
 467 {
 468         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 469
 470         regcache_mark_dirty(pdm->regmap);
 471
 472         return 0;
 473 }
 474
 475 static int rockchip_pdm_resume(struct device *dev)
 476 {
 477         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 478         int ret;
 479
 480         ret = pm_runtime_get_sync(dev);
 481         if (ret < 0)
 482                 return ret;
 483
 484         ret = regcache_sync(pdm->regmap);
 485
 486         pm_runtime_put(dev);
 487
 488         return ret;
 489 }
 490 #endif
 491
 492 static const struct dev_pm_ops rockchip_pdm_pm_ops = {
 493         SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
 494                            rockchip_pdm_runtime_resume, NULL)
 495         SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
 496 };
 497
 498 static const struct of_device_id rockchip_pdm_match[] = {
 499         { .compatible = "rockchip,pdm", },
 500         {},
 501 };
 502 MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
 503
 504 static struct platform_driver rockchip_pdm_driver = {
 505         .probe  = rockchip_pdm_probe,
 506         .remove = rockchip_pdm_remove,
 507         .driver = {
 508                 .name = "rockchip-pdm",
 509                 .of_match_table = of_match_ptr(rockchip_pdm_match),
 510                 .pm = &rockchip_pdm_pm_ops,
 511         },
 512 };
 513
 514 module_platform_driver(rockchip_pdm_driver);
 515
 516 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
 517 MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
 518 MODULE_LICENSE("GPL v2");