sound/soc/tegra/tegra20_spdif.c

   1 /*
   2  * tegra20_spdif.c - Tegra20 SPDIF driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2011-2012 - NVIDIA, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  */
  22
  23 #include <linux/clk.h>
  24 #include <linux/device.h>
  25 #include <linux/io.h>
  26 #include <linux/module.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/regmap.h>
  30 #include <linux/slab.h>
  31 #include <sound/core.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/soc.h>
  35 #include <sound/dmaengine_pcm.h>
  36
  37 #include "tegra20_spdif.h"
  38
  39 #define DRV_NAME "tegra20-spdif"
  40
  41 static int tegra20_spdif_runtime_suspend(struct device *dev)
  42 {
  43         struct tegra20_spdif *spdif = dev_get_drvdata(dev);
  44
  45         clk_disable_unprepare(spdif->clk_spdif_out);
  46
  47         return 0;
  48 }
  49
  50 static int tegra20_spdif_runtime_resume(struct device *dev)
  51 {
  52         struct tegra20_spdif *spdif = dev_get_drvdata(dev);
  53         int ret;
  54
  55         ret = clk_prepare_enable(spdif->clk_spdif_out);
  56         if (ret) {
  57                 dev_err(dev, "clk_enable failed: %d\n", ret);
  58                 return ret;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
  65                                 struct snd_pcm_hw_params *params,
  66                                 struct snd_soc_dai *dai)
  67 {
  68         struct device *dev = dai->dev;
  69         struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
  70         unsigned int mask = 0, val = 0;
  71         int ret, spdifclock;
  72
  73         mask |= TEGRA20_SPDIF_CTRL_PACK |
  74                 TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
  75         switch (params_format(params)) {
  76         case SNDRV_PCM_FORMAT_S16_LE:
  77                 val |= TEGRA20_SPDIF_CTRL_PACK |
  78                        TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
  79                 break;
  80         default:
  81                 return -EINVAL;
  82         }
  83
  84         regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val);
  85
  86         switch (params_rate(params)) {
  87         case 32000:
  88                 spdifclock = 4096000;
  89                 break;
  90         case 44100:
  91                 spdifclock = 5644800;
  92                 break;
  93         case 48000:
  94                 spdifclock = 6144000;
  95                 break;
  96         case 88200:
  97                 spdifclock = 11289600;
  98                 break;
  99         case 96000:
 100                 spdifclock = 12288000;
 101                 break;
 102         case 176400:
 103                 spdifclock = 22579200;
 104                 break;
 105         case 192000:
 106                 spdifclock = 24576000;
 107                 break;
 108         default:
 109                 return -EINVAL;
 110         }
 111
 112         ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
 113         if (ret) {
 114                 dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
 115                 return ret;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void tegra20_spdif_start_playback(struct tegra20_spdif *spdif)
 122 {
 123         regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
 124                            TEGRA20_SPDIF_CTRL_TX_EN,
 125                            TEGRA20_SPDIF_CTRL_TX_EN);
 126 }
 127
 128 static void tegra20_spdif_stop_playback(struct tegra20_spdif *spdif)
 129 {
 130         regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
 131                            TEGRA20_SPDIF_CTRL_TX_EN, 0);
 132 }
 133
 134 static int tegra20_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 135                                 struct snd_soc_dai *dai)
 136 {
 137         struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 138
 139         switch (cmd) {
 140         case SNDRV_PCM_TRIGGER_START:
 141         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 142         case SNDRV_PCM_TRIGGER_RESUME:
 143                 tegra20_spdif_start_playback(spdif);
 144                 break;
 145         case SNDRV_PCM_TRIGGER_STOP:
 146         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 147         case SNDRV_PCM_TRIGGER_SUSPEND:
 148                 tegra20_spdif_stop_playback(spdif);
 149                 break;
 150         default:
 151                 return -EINVAL;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int tegra20_spdif_probe(struct snd_soc_dai *dai)
 158 {
 159         struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 160
 161         dai->capture_dma_data = NULL;
 162         dai->playback_dma_data = &spdif->playback_dma_data;
 163
 164         return 0;
 165 }
 166
 167 static const struct snd_soc_dai_ops tegra20_spdif_dai_ops = {
 168         .hw_params      = tegra20_spdif_hw_params,
 169         .trigger        = tegra20_spdif_trigger,
 170 };
 171
 172 static struct snd_soc_dai_driver tegra20_spdif_dai = {
 173         .name = DRV_NAME,
 174         .probe = tegra20_spdif_probe,
 175         .playback = {
 176                 .stream_name = "Playback",
 177                 .channels_min = 2,
 178                 .channels_max = 2,
 179                 .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 180                                 SNDRV_PCM_RATE_48000,
 181                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 182         },
 183         .ops = &tegra20_spdif_dai_ops,
 184 };
 185
 186 static const struct snd_soc_component_driver tegra20_spdif_component = {
 187         .name           = DRV_NAME,
 188 };
 189
 190 static bool tegra20_spdif_wr_rd_reg(struct device *dev, unsigned int reg)
 191 {
 192         switch (reg) {
 193         case TEGRA20_SPDIF_CTRL:
 194         case TEGRA20_SPDIF_STATUS:
 195         case TEGRA20_SPDIF_STROBE_CTRL:
 196         case TEGRA20_SPDIF_DATA_FIFO_CSR:
 197         case TEGRA20_SPDIF_DATA_OUT:
 198         case TEGRA20_SPDIF_DATA_IN:
 199         case TEGRA20_SPDIF_CH_STA_RX_A:
 200         case TEGRA20_SPDIF_CH_STA_RX_B:
 201         case TEGRA20_SPDIF_CH_STA_RX_C:
 202         case TEGRA20_SPDIF_CH_STA_RX_D:
 203         case TEGRA20_SPDIF_CH_STA_RX_E:
 204         case TEGRA20_SPDIF_CH_STA_RX_F:
 205         case TEGRA20_SPDIF_CH_STA_TX_A:
 206         case TEGRA20_SPDIF_CH_STA_TX_B:
 207         case TEGRA20_SPDIF_CH_STA_TX_C:
 208         case TEGRA20_SPDIF_CH_STA_TX_D:
 209         case TEGRA20_SPDIF_CH_STA_TX_E:
 210         case TEGRA20_SPDIF_CH_STA_TX_F:
 211         case TEGRA20_SPDIF_USR_STA_RX_A:
 212         case TEGRA20_SPDIF_USR_DAT_TX_A:
 213                 return true;
 214         default:
 215                 return false;
 216         }
 217 }
 218
 219 static bool tegra20_spdif_volatile_reg(struct device *dev, unsigned int reg)
 220 {
 221         switch (reg) {
 222         case TEGRA20_SPDIF_STATUS:
 223         case TEGRA20_SPDIF_DATA_FIFO_CSR:
 224         case TEGRA20_SPDIF_DATA_OUT:
 225         case TEGRA20_SPDIF_DATA_IN:
 226         case TEGRA20_SPDIF_CH_STA_RX_A:
 227         case TEGRA20_SPDIF_CH_STA_RX_B:
 228         case TEGRA20_SPDIF_CH_STA_RX_C:
 229         case TEGRA20_SPDIF_CH_STA_RX_D:
 230         case TEGRA20_SPDIF_CH_STA_RX_E:
 231         case TEGRA20_SPDIF_CH_STA_RX_F:
 232         case TEGRA20_SPDIF_USR_STA_RX_A:
 233         case TEGRA20_SPDIF_USR_DAT_TX_A:
 234                 return true;
 235         default:
 236                 return false;
 237         }
 238 }
 239
 240 static bool tegra20_spdif_precious_reg(struct device *dev, unsigned int reg)
 241 {
 242         switch (reg) {
 243         case TEGRA20_SPDIF_DATA_OUT:
 244         case TEGRA20_SPDIF_DATA_IN:
 245         case TEGRA20_SPDIF_USR_STA_RX_A:
 246         case TEGRA20_SPDIF_USR_DAT_TX_A:
 247                 return true;
 248         default:
 249                 return false;
 250         }
 251 }
 252
 253 static const struct regmap_config tegra20_spdif_regmap_config = {
 254         .reg_bits = 32,
 255         .reg_stride = 4,
 256         .val_bits = 32,
 257         .max_register = TEGRA20_SPDIF_USR_DAT_TX_A,
 258         .writeable_reg = tegra20_spdif_wr_rd_reg,
 259         .readable_reg = tegra20_spdif_wr_rd_reg,
 260         .volatile_reg = tegra20_spdif_volatile_reg,
 261         .precious_reg = tegra20_spdif_precious_reg,
 262         .cache_type = REGCACHE_FLAT,
 263 };
 264
 265 static int tegra20_spdif_platform_probe(struct platform_device *pdev)
 266 {
 267         struct tegra20_spdif *spdif;
 268         struct resource *mem, *dmareq;
 269         void __iomem *regs;
 270         int ret;
 271
 272         spdif = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_spdif),
 273                              GFP_KERNEL);
 274         if (!spdif) {
 275                 dev_err(&pdev->dev, "Can't allocate tegra20_spdif\n");
 276                 return -ENOMEM;
 277         }
 278         dev_set_drvdata(&pdev->dev, spdif);
 279
 280         spdif->clk_spdif_out = devm_clk_get(&pdev->dev, "spdif_out");
 281         if (IS_ERR(spdif->clk_spdif_out)) {
 282                 pr_err("Can't retrieve spdif clock\n");
 283                 ret = PTR_ERR(spdif->clk_spdif_out);
 284                 return ret;
 285         }
 286
 287         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 288         regs = devm_ioremap_resource(&pdev->dev, mem);
 289         if (IS_ERR(regs))
 290                 return PTR_ERR(regs);
 291
 292         dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 293         if (!dmareq) {
 294                 dev_err(&pdev->dev, "No DMA resource\n");
 295                 return -ENODEV;
 296         }
 297
 298         spdif->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 299                                             &tegra20_spdif_regmap_config);
 300         if (IS_ERR(spdif->regmap)) {
 301                 dev_err(&pdev->dev, "regmap init failed\n");
 302                 ret = PTR_ERR(spdif->regmap);
 303                 return ret;
 304         }
 305
 306         spdif->playback_dma_data.addr = mem->start + TEGRA20_SPDIF_DATA_OUT;
 307         spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 308         spdif->playback_dma_data.maxburst = 4;
 309         spdif->playback_dma_data.slave_id = dmareq->start;
 310
 311         pm_runtime_enable(&pdev->dev);
 312         if (!pm_runtime_enabled(&pdev->dev)) {
 313                 ret = tegra20_spdif_runtime_resume(&pdev->dev);
 314                 if (ret)
 315                         goto err_pm_disable;
 316         }
 317
 318         ret = snd_soc_register_component(&pdev->dev, &tegra20_spdif_component,
 319                                          &tegra20_spdif_dai, 1);
 320         if (ret) {
 321                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 322                 ret = -ENOMEM;
 323                 goto err_suspend;
 324         }
 325
 326         ret = tegra_pcm_platform_register(&pdev->dev);
 327         if (ret) {
 328                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 329                 goto err_unregister_component;
 330         }
 331
 332         return 0;
 333
 334 err_unregister_component:
 335         snd_soc_unregister_component(&pdev->dev);
 336 err_suspend:
 337         if (!pm_runtime_status_suspended(&pdev->dev))
 338                 tegra20_spdif_runtime_suspend(&pdev->dev);
 339 err_pm_disable:
 340         pm_runtime_disable(&pdev->dev);
 341
 342         return ret;
 343 }
 344
 345 static int tegra20_spdif_platform_remove(struct platform_device *pdev)
 346 {
 347         pm_runtime_disable(&pdev->dev);
 348         if (!pm_runtime_status_suspended(&pdev->dev))
 349                 tegra20_spdif_runtime_suspend(&pdev->dev);
 350
 351         tegra_pcm_platform_unregister(&pdev->dev);
 352         snd_soc_unregister_component(&pdev->dev);
 353
 354         return 0;
 355 }
 356
 357 static const struct dev_pm_ops tegra20_spdif_pm_ops = {
 358         SET_RUNTIME_PM_OPS(tegra20_spdif_runtime_suspend,
 359                            tegra20_spdif_runtime_resume, NULL)
 360 };
 361
 362 static struct platform_driver tegra20_spdif_driver = {
 363         .driver = {
 364                 .name = DRV_NAME,
 365                 .pm = &tegra20_spdif_pm_ops,
 366         },
 367         .probe = tegra20_spdif_platform_probe,
 368         .remove = tegra20_spdif_platform_remove,
 369 };
 370
 371 module_platform_driver(tegra20_spdif_driver);
 372
 373 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 374 MODULE_DESCRIPTION("Tegra20 SPDIF ASoC driver");
 375 MODULE_LICENSE("GPL");
 376 MODULE_ALIAS("platform:" DRV_NAME);