sound/soc/spear/spdif_out.c

   1 /*
   2  * ALSA SoC SPDIF Out Audio Layer for spear processors
   3  *
   4  * Copyright (C) 2012 ST Microelectronics
   5  * Vipin Kumar <vipin.kumar@st.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/ioport.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <sound/soc.h>
  22 #include <sound/spear_dma.h>
  23 #include <sound/spear_spdif.h>
  24 #include "spdif_out_regs.h"
  25
  26 struct spdif_out_params {
  27         u32 rate;
  28         u32 core_freq;
  29         u32 mute;
  30 };
  31
  32 struct spdif_out_dev {
  33         struct clk *clk;
  34         struct spear_dma_data dma_params;
  35         struct spdif_out_params saved_params;
  36         u32 running;
  37         void __iomem *io_base;
  38 };
  39
  40 static void spdif_out_configure(struct spdif_out_dev *host)
  41 {
  42         writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
  43         mdelay(1);
  44         writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
  45                         host->io_base + SPDIF_OUT_SOFT_RST);
  46
  47         writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
  48                         SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
  49                         SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
  50                         host->io_base + SPDIF_OUT_CFG);
  51
  52         writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
  53         writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
  54 }
  55
  56 static int spdif_out_startup(struct snd_pcm_substream *substream,
  57                 struct snd_soc_dai *cpu_dai)
  58 {
  59         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
  60         int ret;
  61
  62         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
  63                 return -EINVAL;
  64
  65         snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);
  66
  67         ret = clk_enable(host->clk);
  68         if (ret)
  69                 return ret;
  70
  71         host->running = true;
  72         spdif_out_configure(host);
  73
  74         return 0;
  75 }
  76
  77 static void spdif_out_shutdown(struct snd_pcm_substream *substream,
  78                 struct snd_soc_dai *dai)
  79 {
  80         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
  81
  82         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
  83                 return;
  84
  85         clk_disable(host->clk);
  86         host->running = false;
  87         snd_soc_dai_set_dma_data(dai, substream, NULL);
  88 }
  89
  90 static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
  91                 u32 rate)
  92 {
  93         u32 divider, ctrl;
  94
  95         clk_set_rate(host->clk, core_freq);
  96         divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
  97
  98         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
  99         ctrl &= ~SPDIF_DIVIDER_MASK;
 100         ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
 101         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
 102 }
 103
 104 static int spdif_out_hw_params(struct snd_pcm_substream *substream,
 105                 struct snd_pcm_hw_params *params,
 106                 struct snd_soc_dai *dai)
 107 {
 108         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 109         u32 rate, core_freq;
 110
 111         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 112                 return -EINVAL;
 113
 114         rate = params_rate(params);
 115
 116         switch (rate) {
 117         case 8000:
 118         case 16000:
 119         case 32000:
 120         case 64000:
 121                 /*
 122                  * The clock is multiplied by 10 to bring it to feasible range
 123                  * of frequencies for sscg
 124                  */
 125                 core_freq = 64000 * 128 * 10;   /* 81.92 MHz */
 126                 break;
 127         case 5512:
 128         case 11025:
 129         case 22050:
 130         case 44100:
 131         case 88200:
 132         case 176400:
 133                 core_freq = 176400 * 128;       /* 22.5792 MHz */
 134                 break;
 135         case 48000:
 136         case 96000:
 137         case 192000:
 138         default:
 139                 core_freq = 192000 * 128;       /* 24.576 MHz */
 140                 break;
 141         }
 142
 143         spdif_out_clock(host, core_freq, rate);
 144         host->saved_params.core_freq = core_freq;
 145         host->saved_params.rate = rate;
 146
 147         return 0;
 148 }
 149
 150 static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
 151                 struct snd_soc_dai *dai)
 152 {
 153         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 154         u32 ctrl;
 155         int ret = 0;
 156
 157         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 158                 return -EINVAL;
 159
 160         switch (cmd) {
 161         case SNDRV_PCM_TRIGGER_START:
 162         case SNDRV_PCM_TRIGGER_RESUME:
 163         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 164                         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
 165                         ctrl &= ~SPDIF_OPMODE_MASK;
 166                         if (!host->saved_params.mute)
 167                                 ctrl |= SPDIF_OPMODE_AUD_DATA |
 168                                         SPDIF_STATE_NORMAL;
 169                         else
 170                                 ctrl |= SPDIF_OPMODE_MUTE_PCM;
 171                         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
 172                 break;
 173
 174         case SNDRV_PCM_TRIGGER_STOP:
 175         case SNDRV_PCM_TRIGGER_SUSPEND:
 176         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 177                 ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
 178                 ctrl &= ~SPDIF_OPMODE_MASK;
 179                 ctrl |= SPDIF_OPMODE_OFF;
 180                 writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
 181                 break;
 182
 183         default:
 184                 ret = -EINVAL;
 185                 break;
 186         }
 187         return ret;
 188 }
 189
 190 static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
 191 {
 192         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 193         u32 val;
 194
 195         host->saved_params.mute = mute;
 196         val = readl(host->io_base + SPDIF_OUT_CTRL);
 197         val &= ~SPDIF_OPMODE_MASK;
 198
 199         if (mute)
 200                 val |= SPDIF_OPMODE_MUTE_PCM;
 201         else {
 202                 if (host->running)
 203                         val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
 204                 else
 205                         val |= SPDIF_OPMODE_OFF;
 206         }
 207
 208         writel(val, host->io_base + SPDIF_OUT_CTRL);
 209         return 0;
 210 }
 211
 212 static int spdif_mute_get(struct snd_kcontrol *kcontrol,
 213                 struct snd_ctl_elem_value *ucontrol)
 214 {
 215         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 216         struct snd_soc_card *card = codec->card;
 217         struct snd_soc_pcm_runtime *rtd = card->rtd;
 218         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 219         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
 220
 221         ucontrol->value.integer.value[0] = host->saved_params.mute;
 222         return 0;
 223 }
 224
 225 static int spdif_mute_put(struct snd_kcontrol *kcontrol,
 226                 struct snd_ctl_elem_value *ucontrol)
 227 {
 228         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 229         struct snd_soc_card *card = codec->card;
 230         struct snd_soc_pcm_runtime *rtd = card->rtd;
 231         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 232         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
 233
 234         if (host->saved_params.mute == ucontrol->value.integer.value[0])
 235                 return 0;
 236
 237         spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
 238
 239         return 1;
 240 }
 241 static const struct snd_kcontrol_new spdif_out_controls[] = {
 242         SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
 243                         spdif_mute_get, spdif_mute_put),
 244 };
 245
 246 int spdif_soc_dai_probe(struct snd_soc_dai *dai)
 247 {
 248         return snd_soc_add_dai_controls(dai, spdif_out_controls,
 249                                 ARRAY_SIZE(spdif_out_controls));
 250 }
 251
 252 static const struct snd_soc_dai_ops spdif_out_dai_ops = {
 253         .digital_mute   = spdif_digital_mute,
 254         .startup        = spdif_out_startup,
 255         .shutdown       = spdif_out_shutdown,
 256         .trigger        = spdif_out_trigger,
 257         .hw_params      = spdif_out_hw_params,
 258 };
 259
 260 static struct snd_soc_dai_driver spdif_out_dai = {
 261         .playback = {
 262                 .channels_min = 2,
 263                 .channels_max = 2,
 264                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 265                                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
 266                                  SNDRV_PCM_RATE_192000),
 267                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 268         },
 269         .probe = spdif_soc_dai_probe,
 270         .ops = &spdif_out_dai_ops,
 271 };
 272
 273 static int spdif_out_probe(struct platform_device *pdev)
 274 {
 275         struct spdif_out_dev *host;
 276         struct spear_spdif_platform_data *pdata;
 277         struct resource *res;
 278         int ret;
 279
 280         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 281         if (!res)
 282                 return -EINVAL;
 283
 284         if (!devm_request_mem_region(&pdev->dev, res->start,
 285                                 resource_size(res), pdev->name)) {
 286                 dev_warn(&pdev->dev, "Failed to get memory resourse\n");
 287                 return -ENOENT;
 288         }
 289
 290         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 291         if (!host) {
 292                 dev_warn(&pdev->dev, "kzalloc fail\n");
 293                 return -ENOMEM;
 294         }
 295
 296         host->io_base = devm_ioremap(&pdev->dev, res->start,
 297                                 resource_size(res));
 298         if (!host->io_base) {
 299                 dev_warn(&pdev->dev, "ioremap failed\n");
 300                 return -ENOMEM;
 301         }
 302
 303         host->clk = clk_get(&pdev->dev, NULL);
 304         if (IS_ERR(host->clk))
 305                 return PTR_ERR(host->clk);
 306
 307         pdata = dev_get_platdata(&pdev->dev);
 308
 309         host->dma_params.data = pdata->dma_params;
 310         host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
 311         host->dma_params.max_burst = 16;
 312         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 313         host->dma_params.filter = pdata->filter;
 314
 315         dev_set_drvdata(&pdev->dev, host);
 316
 317         ret = snd_soc_register_dai(&pdev->dev, &spdif_out_dai);
 318         if (ret != 0) {
 319                 clk_put(host->clk);
 320                 return ret;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static int spdif_out_remove(struct platform_device *pdev)
 327 {
 328         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
 329
 330         snd_soc_unregister_dai(&pdev->dev);
 331         dev_set_drvdata(&pdev->dev, NULL);
 332
 333         clk_put(host->clk);
 334
 335         return 0;
 336 }
 337
 338 #ifdef CONFIG_PM
 339 static int spdif_out_suspend(struct device *dev)
 340 {
 341         struct platform_device *pdev = to_platform_device(dev);
 342         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
 343
 344         if (host->running)
 345                 clk_disable(host->clk);
 346
 347         return 0;
 348 }
 349
 350 static int spdif_out_resume(struct device *dev)
 351 {
 352         struct platform_device *pdev = to_platform_device(dev);
 353         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
 354
 355         if (host->running) {
 356                 clk_enable(host->clk);
 357                 spdif_out_configure(host);
 358                 spdif_out_clock(host, host->saved_params.core_freq,
 359                                 host->saved_params.rate);
 360         }
 361         return 0;
 362 }
 363
 364 static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
 365                 spdif_out_resume);
 366
 367 #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
 368
 369 #else
 370 #define SPDIF_OUT_DEV_PM_OPS NULL
 371
 372 #endif
 373
 374 static struct platform_driver spdif_out_driver = {
 375         .probe          = spdif_out_probe,
 376         .remove         = spdif_out_remove,
 377         .driver         = {
 378                 .name   = "spdif-out",
 379                 .owner  = THIS_MODULE,
 380                 .pm     = SPDIF_OUT_DEV_PM_OPS,
 381         },
 382 };
 383
 384 module_platform_driver(spdif_out_driver);
 385
 386 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 387 MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
 388 MODULE_LICENSE("GPL");
 389 MODULE_ALIAS("platform:spdif_out");