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         ret = clk_enable(host->clk);
  66         if (ret)
  67                 return ret;
  68
  69         host->running = true;
  70         spdif_out_configure(host);
  71
  72         return 0;
  73 }
  74
  75 static void spdif_out_shutdown(struct snd_pcm_substream *substream,
  76                 struct snd_soc_dai *dai)
  77 {
  78         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
  79
  80         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
  81                 return;
  82
  83         clk_disable(host->clk);
  84         host->running = false;
  85 }
  86
  87 static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
  88                 u32 rate)
  89 {
  90         u32 divider, ctrl;
  91
  92         clk_set_rate(host->clk, core_freq);
  93         divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
  94
  95         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
  96         ctrl &= ~SPDIF_DIVIDER_MASK;
  97         ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
  98         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
  99 }
 100
 101 static int spdif_out_hw_params(struct snd_pcm_substream *substream,
 102                 struct snd_pcm_hw_params *params,
 103                 struct snd_soc_dai *dai)
 104 {
 105         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 106         u32 rate, core_freq;
 107
 108         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 109                 return -EINVAL;
 110
 111         rate = params_rate(params);
 112
 113         switch (rate) {
 114         case 8000:
 115         case 16000:
 116         case 32000:
 117         case 64000:
 118                 /*
 119                  * The clock is multiplied by 10 to bring it to feasible range
 120                  * of frequencies for sscg
 121                  */
 122                 core_freq = 64000 * 128 * 10;   /* 81.92 MHz */
 123                 break;
 124         case 5512:
 125         case 11025:
 126         case 22050:
 127         case 44100:
 128         case 88200:
 129         case 176400:
 130                 core_freq = 176400 * 128;       /* 22.5792 MHz */
 131                 break;
 132         case 48000:
 133         case 96000:
 134         case 192000:
 135         default:
 136                 core_freq = 192000 * 128;       /* 24.576 MHz */
 137                 break;
 138         }
 139
 140         spdif_out_clock(host, core_freq, rate);
 141         host->saved_params.core_freq = core_freq;
 142         host->saved_params.rate = rate;
 143
 144         return 0;
 145 }
 146
 147 static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
 148                 struct snd_soc_dai *dai)
 149 {
 150         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 151         u32 ctrl;
 152         int ret = 0;
 153
 154         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 155                 return -EINVAL;
 156
 157         switch (cmd) {
 158         case SNDRV_PCM_TRIGGER_START:
 159         case SNDRV_PCM_TRIGGER_RESUME:
 160         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 161                         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
 162                         ctrl &= ~SPDIF_OPMODE_MASK;
 163                         if (!host->saved_params.mute)
 164                                 ctrl |= SPDIF_OPMODE_AUD_DATA |
 165                                         SPDIF_STATE_NORMAL;
 166                         else
 167                                 ctrl |= SPDIF_OPMODE_MUTE_PCM;
 168                         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
 169                 break;
 170
 171         case SNDRV_PCM_TRIGGER_STOP:
 172         case SNDRV_PCM_TRIGGER_SUSPEND:
 173         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 174                 ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
 175                 ctrl &= ~SPDIF_OPMODE_MASK;
 176                 ctrl |= SPDIF_OPMODE_OFF;
 177                 writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
 178                 break;
 179
 180         default:
 181                 ret = -EINVAL;
 182                 break;
 183         }
 184         return ret;
 185 }
 186
 187 static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
 188 {
 189         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 190         u32 val;
 191
 192         host->saved_params.mute = mute;
 193         val = readl(host->io_base + SPDIF_OUT_CTRL);
 194         val &= ~SPDIF_OPMODE_MASK;
 195
 196         if (mute)
 197                 val |= SPDIF_OPMODE_MUTE_PCM;
 198         else {
 199                 if (host->running)
 200                         val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
 201                 else
 202                         val |= SPDIF_OPMODE_OFF;
 203         }
 204
 205         writel(val, host->io_base + SPDIF_OUT_CTRL);
 206         return 0;
 207 }
 208
 209 static int spdif_mute_get(struct snd_kcontrol *kcontrol,
 210                 struct snd_ctl_elem_value *ucontrol)
 211 {
 212         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 213         struct snd_soc_card *card = codec->card;
 214         struct snd_soc_pcm_runtime *rtd = card->rtd;
 215         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 216         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
 217
 218         ucontrol->value.integer.value[0] = host->saved_params.mute;
 219         return 0;
 220 }
 221
 222 static int spdif_mute_put(struct snd_kcontrol *kcontrol,
 223                 struct snd_ctl_elem_value *ucontrol)
 224 {
 225         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 226         struct snd_soc_card *card = codec->card;
 227         struct snd_soc_pcm_runtime *rtd = card->rtd;
 228         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 229         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
 230
 231         if (host->saved_params.mute == ucontrol->value.integer.value[0])
 232                 return 0;
 233
 234         spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
 235
 236         return 1;
 237 }
 238 static const struct snd_kcontrol_new spdif_out_controls[] = {
 239         SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
 240                         spdif_mute_get, spdif_mute_put),
 241 };
 242
 243 static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
 244 {
 245         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 246
 247         dai->playback_dma_data = &host->dma_params;
 248
 249         return snd_soc_add_dai_controls(dai, spdif_out_controls,
 250                                 ARRAY_SIZE(spdif_out_controls));
 251 }
 252
 253 static const struct snd_soc_dai_ops spdif_out_dai_ops = {
 254         .digital_mute   = spdif_digital_mute,
 255         .startup        = spdif_out_startup,
 256         .shutdown       = spdif_out_shutdown,
 257         .trigger        = spdif_out_trigger,
 258         .hw_params      = spdif_out_hw_params,
 259 };
 260
 261 static struct snd_soc_dai_driver spdif_out_dai = {
 262         .playback = {
 263                 .channels_min = 2,
 264                 .channels_max = 2,
 265                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 266                                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
 267                                  SNDRV_PCM_RATE_192000),
 268                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 269         },
 270         .probe = spdif_soc_dai_probe,
 271         .ops = &spdif_out_dai_ops,
 272 };
 273
 274 static const struct snd_soc_component_driver spdif_out_component = {
 275         .name           = "spdif-out",
 276 };
 277
 278 static int spdif_out_probe(struct platform_device *pdev)
 279 {
 280         struct spdif_out_dev *host;
 281         struct spear_spdif_platform_data *pdata;
 282         struct resource *res;
 283         int ret;
 284
 285         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 286         if (!host) {
 287                 dev_warn(&pdev->dev, "kzalloc fail\n");
 288                 return -ENOMEM;
 289         }
 290
 291         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 292         host->io_base = devm_ioremap_resource(&pdev->dev, res);
 293         if (IS_ERR(host->io_base))
 294                 return PTR_ERR(host->io_base);
 295
 296         host->clk = devm_clk_get(&pdev->dev, NULL);
 297         if (IS_ERR(host->clk))
 298                 return PTR_ERR(host->clk);
 299
 300         pdata = dev_get_platdata(&pdev->dev);
 301
 302         host->dma_params.data = pdata->dma_params;
 303         host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
 304         host->dma_params.max_burst = 16;
 305         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 306         host->dma_params.filter = pdata->filter;
 307
 308         dev_set_drvdata(&pdev->dev, host);
 309
 310         ret = snd_soc_register_component(&pdev->dev, &spdif_out_component,
 311                                          &spdif_out_dai, 1);
 312         return ret;
 313 }
 314
 315 static int spdif_out_remove(struct platform_device *pdev)
 316 {
 317         snd_soc_unregister_component(&pdev->dev);
 318
 319         return 0;
 320 }
 321
 322 #ifdef CONFIG_PM
 323 static int spdif_out_suspend(struct device *dev)
 324 {
 325         struct platform_device *pdev = to_platform_device(dev);
 326         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
 327
 328         if (host->running)
 329                 clk_disable(host->clk);
 330
 331         return 0;
 332 }
 333
 334 static int spdif_out_resume(struct device *dev)
 335 {
 336         struct platform_device *pdev = to_platform_device(dev);
 337         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
 338
 339         if (host->running) {
 340                 clk_enable(host->clk);
 341                 spdif_out_configure(host);
 342                 spdif_out_clock(host, host->saved_params.core_freq,
 343                                 host->saved_params.rate);
 344         }
 345         return 0;
 346 }
 347
 348 static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
 349                 spdif_out_resume);
 350
 351 #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
 352
 353 #else
 354 #define SPDIF_OUT_DEV_PM_OPS NULL
 355
 356 #endif
 357
 358 static struct platform_driver spdif_out_driver = {
 359         .probe          = spdif_out_probe,
 360         .remove         = spdif_out_remove,
 361         .driver         = {
 362                 .name   = "spdif-out",
 363                 .owner  = THIS_MODULE,
 364                 .pm     = SPDIF_OUT_DEV_PM_OPS,
 365         },
 366 };
 367
 368 module_platform_driver(spdif_out_driver);
 369
 370 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 371 MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
 372 MODULE_LICENSE("GPL");
 373 MODULE_ALIAS("platform:spdif_out");