sound/soc/rockchip/rockchip_spdif.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* sound/soc/rockchip/rk_spdif.c
   3  *
   4  * ALSA SoC Audio Layer - Rockchip I2S Controller driver
   5  *
   6  * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
   7  * Author: Jianqun <jay.xu@rock-chips.com>
   8  * Copyright (c) 2015 Collabora Ltd.
   9  * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/clk.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/mfd/syscon.h>
  18 #include <linux/regmap.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/dmaengine_pcm.h>
  21
  22 #include "rockchip_spdif.h"
  23
  24 enum rk_spdif_type {
  25         RK_SPDIF_RK3066,
  26         RK_SPDIF_RK3188,
  27         RK_SPDIF_RK3288,
  28         RK_SPDIF_RK3366,
  29 };
  30
  31 #define RK3288_GRF_SOC_CON2 0x24c
  32
  33 struct rk_spdif_dev {
  34         struct device *dev;
  35
  36         struct clk *mclk;
  37         struct clk *hclk;
  38
  39         struct snd_dmaengine_dai_dma_data playback_dma_data;
  40
  41         struct regmap *regmap;
  42 };
  43
  44 static const struct of_device_id rk_spdif_match[] __maybe_unused = {
  45         { .compatible = "rockchip,rk3066-spdif",
  46           .data = (void *)RK_SPDIF_RK3066 },
  47         { .compatible = "rockchip,rk3188-spdif",
  48           .data = (void *)RK_SPDIF_RK3188 },
  49         { .compatible = "rockchip,rk3228-spdif",
  50           .data = (void *)RK_SPDIF_RK3366 },
  51         { .compatible = "rockchip,rk3288-spdif",
  52           .data = (void *)RK_SPDIF_RK3288 },
  53         { .compatible = "rockchip,rk3328-spdif",
  54           .data = (void *)RK_SPDIF_RK3366 },
  55         { .compatible = "rockchip,rk3366-spdif",
  56           .data = (void *)RK_SPDIF_RK3366 },
  57         { .compatible = "rockchip,rk3368-spdif",
  58           .data = (void *)RK_SPDIF_RK3366 },
  59         { .compatible = "rockchip,rk3399-spdif",
  60           .data = (void *)RK_SPDIF_RK3366 },
  61         { .compatible = "rockchip,rk3568-spdif",
  62           .data = (void *)RK_SPDIF_RK3366 },
  63         {},
  64 };
  65 MODULE_DEVICE_TABLE(of, rk_spdif_match);
  66
  67 static int __maybe_unused rk_spdif_runtime_suspend(struct device *dev)
  68 {
  69         struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
  70
  71         regcache_cache_only(spdif->regmap, true);
  72         clk_disable_unprepare(spdif->mclk);
  73         clk_disable_unprepare(spdif->hclk);
  74
  75         return 0;
  76 }
  77
  78 static int __maybe_unused rk_spdif_runtime_resume(struct device *dev)
  79 {
  80         struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
  81         int ret;
  82
  83         ret = clk_prepare_enable(spdif->mclk);
  84         if (ret) {
  85                 dev_err(spdif->dev, "mclk clock enable failed %d\n", ret);
  86                 return ret;
  87         }
  88
  89         ret = clk_prepare_enable(spdif->hclk);
  90         if (ret) {
  91                 dev_err(spdif->dev, "hclk clock enable failed %d\n", ret);
  92                 return ret;
  93         }
  94
  95         regcache_cache_only(spdif->regmap, false);
  96         regcache_mark_dirty(spdif->regmap);
  97
  98         ret = regcache_sync(spdif->regmap);
  99         if (ret) {
 100                 clk_disable_unprepare(spdif->mclk);
 101                 clk_disable_unprepare(spdif->hclk);
 102         }
 103
 104         return ret;
 105 }
 106
 107 static int rk_spdif_hw_params(struct snd_pcm_substream *substream,
 108                               struct snd_pcm_hw_params *params,
 109                               struct snd_soc_dai *dai)
 110 {
 111         struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
 112         unsigned int val = SPDIF_CFGR_HALFWORD_ENABLE;
 113         int srate, mclk;
 114         int ret;
 115
 116         srate = params_rate(params);
 117         mclk = srate * 128;
 118
 119         switch (params_format(params)) {
 120         case SNDRV_PCM_FORMAT_S16_LE:
 121                 val |= SPDIF_CFGR_VDW_16;
 122                 break;
 123         case SNDRV_PCM_FORMAT_S20_3LE:
 124                 val |= SPDIF_CFGR_VDW_20;
 125                 break;
 126         case SNDRV_PCM_FORMAT_S24_LE:
 127                 val |= SPDIF_CFGR_VDW_24;
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132
 133         /* Set clock and calculate divider */
 134         ret = clk_set_rate(spdif->mclk, mclk);
 135         if (ret != 0) {
 136                 dev_err(spdif->dev, "Failed to set module clock rate: %d\n",
 137                         ret);
 138                 return ret;
 139         }
 140
 141         ret = regmap_update_bits(spdif->regmap, SPDIF_CFGR,
 142                                  SPDIF_CFGR_CLK_DIV_MASK |
 143                                  SPDIF_CFGR_HALFWORD_ENABLE |
 144                                  SDPIF_CFGR_VDW_MASK, val);
 145
 146         return ret;
 147 }
 148
 149 static int rk_spdif_trigger(struct snd_pcm_substream *substream,
 150                             int cmd, struct snd_soc_dai *dai)
 151 {
 152         struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
 153         int ret;
 154
 155         switch (cmd) {
 156         case SNDRV_PCM_TRIGGER_START:
 157         case SNDRV_PCM_TRIGGER_RESUME:
 158         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 159                 ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
 160                                          SPDIF_DMACR_TDE_ENABLE |
 161                                          SPDIF_DMACR_TDL_MASK,
 162                                          SPDIF_DMACR_TDE_ENABLE |
 163                                          SPDIF_DMACR_TDL(16));
 164
 165                 if (ret != 0)
 166                         return ret;
 167
 168                 ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
 169                                          SPDIF_XFER_TXS_START,
 170                                          SPDIF_XFER_TXS_START);
 171                 break;
 172         case SNDRV_PCM_TRIGGER_SUSPEND:
 173         case SNDRV_PCM_TRIGGER_STOP:
 174         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 175                 ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
 176                                          SPDIF_DMACR_TDE_ENABLE,
 177                                          SPDIF_DMACR_TDE_DISABLE);
 178
 179                 if (ret != 0)
 180                         return ret;
 181
 182                 ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
 183                                          SPDIF_XFER_TXS_START,
 184                                          SPDIF_XFER_TXS_STOP);
 185                 break;
 186         default:
 187                 ret = -EINVAL;
 188                 break;
 189         }
 190
 191         return ret;
 192 }
 193
 194 static int rk_spdif_dai_probe(struct snd_soc_dai *dai)
 195 {
 196         struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
 197
 198         dai->playback_dma_data = &spdif->playback_dma_data;
 199
 200         return 0;
 201 }
 202
 203 static const struct snd_soc_dai_ops rk_spdif_dai_ops = {
 204         .hw_params = rk_spdif_hw_params,
 205         .trigger = rk_spdif_trigger,
 206 };
 207
 208 static struct snd_soc_dai_driver rk_spdif_dai = {
 209         .probe = rk_spdif_dai_probe,
 210         .playback = {
 211                 .stream_name = "Playback",
 212                 .channels_min = 2,
 213                 .channels_max = 2,
 214                 .rates = (SNDRV_PCM_RATE_32000 |
 215                           SNDRV_PCM_RATE_44100 |
 216                           SNDRV_PCM_RATE_48000 |
 217                           SNDRV_PCM_RATE_96000 |
 218                           SNDRV_PCM_RATE_192000),
 219                 .formats = (SNDRV_PCM_FMTBIT_S16_LE |
 220                             SNDRV_PCM_FMTBIT_S20_3LE |
 221                             SNDRV_PCM_FMTBIT_S24_LE),
 222         },
 223         .ops = &rk_spdif_dai_ops,
 224 };
 225
 226 static const struct snd_soc_component_driver rk_spdif_component = {
 227         .name = "rockchip-spdif",
 228 };
 229
 230 static bool rk_spdif_wr_reg(struct device *dev, unsigned int reg)
 231 {
 232         switch (reg) {
 233         case SPDIF_CFGR:
 234         case SPDIF_DMACR:
 235         case SPDIF_INTCR:
 236         case SPDIF_XFER:
 237         case SPDIF_SMPDR:
 238                 return true;
 239         default:
 240                 return false;
 241         }
 242 }
 243
 244 static bool rk_spdif_rd_reg(struct device *dev, unsigned int reg)
 245 {
 246         switch (reg) {
 247         case SPDIF_CFGR:
 248         case SPDIF_SDBLR:
 249         case SPDIF_INTCR:
 250         case SPDIF_INTSR:
 251         case SPDIF_XFER:
 252         case SPDIF_SMPDR:
 253                 return true;
 254         default:
 255                 return false;
 256         }
 257 }
 258
 259 static bool rk_spdif_volatile_reg(struct device *dev, unsigned int reg)
 260 {
 261         switch (reg) {
 262         case SPDIF_INTSR:
 263         case SPDIF_SDBLR:
 264         case SPDIF_SMPDR:
 265                 return true;
 266         default:
 267                 return false;
 268         }
 269 }
 270
 271 static const struct regmap_config rk_spdif_regmap_config = {
 272         .reg_bits = 32,
 273         .reg_stride = 4,
 274         .val_bits = 32,
 275         .max_register = SPDIF_SMPDR,
 276         .writeable_reg = rk_spdif_wr_reg,
 277         .readable_reg = rk_spdif_rd_reg,
 278         .volatile_reg = rk_spdif_volatile_reg,
 279         .cache_type = REGCACHE_FLAT,
 280 };
 281
 282 static int rk_spdif_probe(struct platform_device *pdev)
 283 {
 284         struct device_node *np = pdev->dev.of_node;
 285         struct rk_spdif_dev *spdif;
 286         const struct of_device_id *match;
 287         struct resource *res;
 288         void __iomem *regs;
 289         int ret;
 290
 291         match = of_match_node(rk_spdif_match, np);
 292         if (match->data == (void *)RK_SPDIF_RK3288) {
 293                 struct regmap *grf;
 294
 295                 grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 296                 if (IS_ERR(grf)) {
 297                         dev_err(&pdev->dev,
 298                                 "rockchip_spdif missing 'rockchip,grf'\n");
 299                         return PTR_ERR(grf);
 300                 }
 301
 302                 /* Select the 8 channel SPDIF solution on RK3288 as
 303                  * the 2 channel one does not appear to work
 304                  */
 305                 regmap_write(grf, RK3288_GRF_SOC_CON2, BIT(1) << 16);
 306         }
 307
 308         spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
 309         if (!spdif)
 310                 return -ENOMEM;
 311
 312         spdif->hclk = devm_clk_get(&pdev->dev, "hclk");
 313         if (IS_ERR(spdif->hclk))
 314                 return PTR_ERR(spdif->hclk);
 315
 316         spdif->mclk = devm_clk_get(&pdev->dev, "mclk");
 317         if (IS_ERR(spdif->mclk))
 318                 return PTR_ERR(spdif->mclk);
 319
 320         regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 321         if (IS_ERR(regs))
 322                 return PTR_ERR(regs);
 323
 324         spdif->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "hclk", regs,
 325                                                   &rk_spdif_regmap_config);
 326         if (IS_ERR(spdif->regmap))
 327                 return PTR_ERR(spdif->regmap);
 328
 329         spdif->playback_dma_data.addr = res->start + SPDIF_SMPDR;
 330         spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 331         spdif->playback_dma_data.maxburst = 4;
 332
 333         spdif->dev = &pdev->dev;
 334         dev_set_drvdata(&pdev->dev, spdif);
 335
 336         pm_runtime_enable(&pdev->dev);
 337         if (!pm_runtime_enabled(&pdev->dev)) {
 338                 ret = rk_spdif_runtime_resume(&pdev->dev);
 339                 if (ret)
 340                         goto err_pm_runtime;
 341         }
 342
 343         ret = devm_snd_soc_register_component(&pdev->dev,
 344                                               &rk_spdif_component,
 345                                               &rk_spdif_dai, 1);
 346         if (ret) {
 347                 dev_err(&pdev->dev, "Could not register DAI\n");
 348                 goto err_pm_suspend;
 349         }
 350
 351         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 352         if (ret) {
 353                 dev_err(&pdev->dev, "Could not register PCM\n");
 354                 goto err_pm_suspend;
 355         }
 356
 357         return 0;
 358
 359 err_pm_suspend:
 360         if (!pm_runtime_status_suspended(&pdev->dev))
 361                 rk_spdif_runtime_suspend(&pdev->dev);
 362 err_pm_runtime:
 363         pm_runtime_disable(&pdev->dev);
 364
 365         return ret;
 366 }
 367
 368 static int rk_spdif_remove(struct platform_device *pdev)
 369 {
 370         pm_runtime_disable(&pdev->dev);
 371         if (!pm_runtime_status_suspended(&pdev->dev))
 372                 rk_spdif_runtime_suspend(&pdev->dev);
 373
 374         return 0;
 375 }
 376
 377 static const struct dev_pm_ops rk_spdif_pm_ops = {
 378         SET_RUNTIME_PM_OPS(rk_spdif_runtime_suspend, rk_spdif_runtime_resume,
 379                            NULL)
 380 };
 381
 382 static struct platform_driver rk_spdif_driver = {
 383         .probe = rk_spdif_probe,
 384         .remove = rk_spdif_remove,
 385         .driver = {
 386                 .name = "rockchip-spdif",
 387                 .of_match_table = of_match_ptr(rk_spdif_match),
 388                 .pm = &rk_spdif_pm_ops,
 389         },
 390 };
 391 module_platform_driver(rk_spdif_driver);
 392
 393 MODULE_ALIAS("platform:rockchip-spdif");
 394 MODULE_DESCRIPTION("ROCKCHIP SPDIF transceiver Interface");
 395 MODULE_AUTHOR("Sjoerd Simons <sjoerd.simons@collabora.co.uk>");
 396 MODULE_LICENSE("GPL v2");