sound/soc/tegra/tegra_spdif.c

   1 /*
   2  * tegra_spdif.c - Tegra SPDIF driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2011 - 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/module.h>
  25 #include <linux/debugfs.h>
  26 #include <linux/device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/slab.h>
  30 #include <linux/io.h>
  31 #include <mach/iomap.h>
  32 #include <sound/core.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/soc.h>
  36
  37 #include "tegra_spdif.h"
  38
  39 #define DRV_NAME "tegra-spdif"
  40
  41 static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
  42                                         u32 val)
  43 {
  44         __raw_writel(val, spdif->regs + reg);
  45 }
  46
  47 static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
  48 {
  49         return __raw_readl(spdif->regs + reg);
  50 }
  51
  52 #ifdef CONFIG_DEBUG_FS
  53 static int tegra_spdif_show(struct seq_file *s, void *unused)
  54 {
  55 #define REG(r) { r, #r }
  56         static const struct {
  57                 int offset;
  58                 const char *name;
  59         } regs[] = {
  60                 REG(TEGRA_SPDIF_CTRL),
  61                 REG(TEGRA_SPDIF_STATUS),
  62                 REG(TEGRA_SPDIF_STROBE_CTRL),
  63                 REG(TEGRA_SPDIF_DATA_FIFO_CSR),
  64                 REG(TEGRA_SPDIF_CH_STA_RX_A),
  65                 REG(TEGRA_SPDIF_CH_STA_RX_B),
  66                 REG(TEGRA_SPDIF_CH_STA_RX_C),
  67                 REG(TEGRA_SPDIF_CH_STA_RX_D),
  68                 REG(TEGRA_SPDIF_CH_STA_RX_E),
  69                 REG(TEGRA_SPDIF_CH_STA_RX_F),
  70                 REG(TEGRA_SPDIF_CH_STA_TX_A),
  71                 REG(TEGRA_SPDIF_CH_STA_TX_B),
  72                 REG(TEGRA_SPDIF_CH_STA_TX_C),
  73                 REG(TEGRA_SPDIF_CH_STA_TX_D),
  74                 REG(TEGRA_SPDIF_CH_STA_TX_E),
  75                 REG(TEGRA_SPDIF_CH_STA_TX_F),
  76         };
  77 #undef REG
  78
  79         struct tegra_spdif *spdif = s->private;
  80         int i;
  81
  82         for (i = 0; i < ARRAY_SIZE(regs); i++) {
  83                 u32 val = tegra_spdif_read(spdif, regs[i].offset);
  84                 seq_printf(s, "%s = %08x\n", regs[i].name, val);
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int tegra_spdif_debug_open(struct inode *inode, struct file *file)
  91 {
  92         return single_open(file, tegra_spdif_show, inode->i_private);
  93 }
  94
  95 static const struct file_operations tegra_spdif_debug_fops = {
  96         .open    = tegra_spdif_debug_open,
  97         .read    = seq_read,
  98         .llseek  = seq_lseek,
  99         .release = single_release,
 100 };
 101
 102 static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
 103 {
 104         spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
 105                                                 snd_soc_debugfs_root, spdif,
 106                                                 &tegra_spdif_debug_fops);
 107 }
 108
 109 static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
 110 {
 111         if (spdif->debug)
 112                 debugfs_remove(spdif->debug);
 113 }
 114 #else
 115 static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
 116 {
 117 }
 118
 119 static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
 120 {
 121 }
 122 #endif
 123
 124 static int tegra_spdif_hw_params(struct snd_pcm_substream *substream,
 125                                 struct snd_pcm_hw_params *params,
 126                                 struct snd_soc_dai *dai)
 127 {
 128         struct device *dev = substream->pcm->card->dev;
 129         struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 130         int ret, srate, spdifclock;
 131
 132         spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
 133         spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
 134         switch (params_format(params)) {
 135         case SNDRV_PCM_FORMAT_S16_LE:
 136                 spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK;
 137                 spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142
 143         srate = params_rate(params);
 144         switch (params_rate(params)) {
 145         case 32000:
 146                 spdifclock = 4096000;
 147                 break;
 148         case 44100:
 149                 spdifclock = 5644800;
 150                 break;
 151         case 48000:
 152                 spdifclock = 6144000;
 153                 break;
 154         case 88200:
 155                 spdifclock = 11289600;
 156                 break;
 157         case 96000:
 158                 spdifclock = 12288000;
 159                 break;
 160         case 176400:
 161                 spdifclock = 22579200;
 162                 break;
 163         case 192000:
 164                 spdifclock = 24576000;
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170         ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
 171         if (ret) {
 172                 dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
 173                 return ret;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static void tegra_spdif_start_playback(struct tegra_spdif *spdif)
 180 {
 181         spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN;
 182         tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
 183 }
 184
 185 static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
 186 {
 187         spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
 188         tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
 189 }
 190
 191 static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 192                                 struct snd_soc_dai *dai)
 193 {
 194         struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 195
 196         switch (cmd) {
 197         case SNDRV_PCM_TRIGGER_START:
 198         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 199         case SNDRV_PCM_TRIGGER_RESUME:
 200                 if (!spdif->clk_refs)
 201                         clk_enable(spdif->clk_spdif_out);
 202                 spdif->clk_refs++;
 203                 tegra_spdif_start_playback(spdif);
 204                 break;
 205         case SNDRV_PCM_TRIGGER_STOP:
 206         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 207         case SNDRV_PCM_TRIGGER_SUSPEND:
 208                 tegra_spdif_stop_playback(spdif);
 209                 spdif->clk_refs--;
 210                 if (!spdif->clk_refs)
 211                         clk_disable(spdif->clk_spdif_out);
 212                 break;
 213         default:
 214                 return -EINVAL;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int tegra_spdif_probe(struct snd_soc_dai *dai)
 221 {
 222         struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 223
 224         dai->capture_dma_data = NULL;
 225         dai->playback_dma_data = &spdif->playback_dma_data;
 226
 227         return 0;
 228 }
 229
 230 static struct snd_soc_dai_ops tegra_spdif_dai_ops = {
 231         .hw_params      = tegra_spdif_hw_params,
 232         .trigger        = tegra_spdif_trigger,
 233 };
 234
 235 struct snd_soc_dai_driver tegra_spdif_dai = {
 236         .name = DRV_NAME,
 237         .probe = tegra_spdif_probe,
 238         .playback = {
 239                 .channels_min = 2,
 240                 .channels_max = 2,
 241                 .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 242                                 SNDRV_PCM_RATE_48000,
 243                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 244         },
 245         .ops = &tegra_spdif_dai_ops,
 246 };
 247
 248 static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
 249 {
 250         struct tegra_spdif *spdif;
 251         struct resource *mem, *memregion, *dmareq;
 252         int ret;
 253
 254         spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
 255         if (!spdif) {
 256                 dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
 257                 ret = -ENOMEM;
 258                 goto exit;
 259         }
 260         dev_set_drvdata(&pdev->dev, spdif);
 261
 262         spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
 263         if (IS_ERR(spdif->clk_spdif_out)) {
 264                 pr_err("Can't retrieve spdif clock\n");
 265                 ret = PTR_ERR(spdif->clk_spdif_out);
 266                 goto err_free;
 267         }
 268
 269         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 270         if (!mem) {
 271                 dev_err(&pdev->dev, "No memory resource\n");
 272                 ret = -ENODEV;
 273                 goto err_clk_put;
 274         }
 275
 276         dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 277         if (!dmareq) {
 278                 dev_err(&pdev->dev, "No DMA resource\n");
 279                 ret = -ENODEV;
 280                 goto err_clk_put;
 281         }
 282
 283         memregion = request_mem_region(mem->start, resource_size(mem),
 284                                         DRV_NAME);
 285         if (!memregion) {
 286                 dev_err(&pdev->dev, "Memory region already claimed\n");
 287                 ret = -EBUSY;
 288                 goto err_clk_put;
 289         }
 290
 291         spdif->regs = ioremap(mem->start, resource_size(mem));
 292         if (!spdif->regs) {
 293                 dev_err(&pdev->dev, "ioremap failed\n");
 294                 ret = -ENOMEM;
 295                 goto err_release;
 296         }
 297
 298         spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
 299         spdif->playback_dma_data.wrap = 4;
 300         spdif->playback_dma_data.width = 32;
 301         spdif->playback_dma_data.req_sel = dmareq->start;
 302
 303         ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
 304         if (ret) {
 305                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 306                 ret = -ENOMEM;
 307                 goto err_unmap;
 308         }
 309
 310         tegra_spdif_debug_add(spdif);
 311
 312         return 0;
 313
 314 err_unmap:
 315         iounmap(spdif->regs);
 316 err_release:
 317         release_mem_region(mem->start, resource_size(mem));
 318 err_clk_put:
 319         clk_put(spdif->clk_spdif_out);
 320 err_free:
 321         kfree(spdif);
 322 exit:
 323         return ret;
 324 }
 325
 326 static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
 327 {
 328         struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
 329         struct resource *res;
 330
 331         snd_soc_unregister_dai(&pdev->dev);
 332
 333         tegra_spdif_debug_remove(spdif);
 334
 335         iounmap(spdif->regs);
 336
 337         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 338         release_mem_region(res->start, resource_size(res));
 339
 340         clk_put(spdif->clk_spdif_out);
 341
 342         kfree(spdif);
 343
 344         return 0;
 345 }
 346
 347 static struct platform_driver tegra_spdif_driver = {
 348         .driver = {
 349                 .name = DRV_NAME,
 350                 .owner = THIS_MODULE,
 351         },
 352         .probe = tegra_spdif_platform_probe,
 353         .remove = __devexit_p(tegra_spdif_platform_remove),
 354 };
 355
 356 static int __init snd_tegra_spdif_init(void)
 357 {
 358         return platform_driver_register(&tegra_spdif_driver);
 359 }
 360 module_init(snd_tegra_spdif_init);
 361
 362 static void __exit snd_tegra_spdif_exit(void)
 363 {
 364         platform_driver_unregister(&tegra_spdif_driver);
 365 }
 366 module_exit(snd_tegra_spdif_exit);
 367
 368 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 369 MODULE_DESCRIPTION("Tegra SPDIF ASoC driver");
 370 MODULE_LICENSE("GPL");
 371 MODULE_ALIAS("platform:" DRV_NAME);