sound/soc/au1x/psc-i2s.c

   1 /*
   2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   3  *
   4  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
   5  *      Manuel Lauss <manuel.lauss@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Au1xxx-PSC I2S glue.
  12  *
  13  * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/suspend.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/initval.h>
  23 #include <sound/soc.h>
  24 #include <asm/mach-au1x00/au1000.h>
  25 #include <asm/mach-au1x00/au1xxx_psc.h>
  26
  27 #include "psc.h"
  28
  29 /* supported I2S DAI hardware formats */
  30 #define AU1XPSC_I2S_DAIFMT \
  31         (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |   \
  32          SND_SOC_DAIFMT_NB_NF)
  33
  34 /* supported I2S direction */
  35 #define AU1XPSC_I2S_DIR \
  36         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  37
  38 #define AU1XPSC_I2S_RATES \
  39         SNDRV_PCM_RATE_8000_192000
  40
  41 #define AU1XPSC_I2S_FMTS \
  42         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
  43
  44 #define I2SSTAT_BUSY(stype)     \
  45         ((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
  46 #define I2SPCR_START(stype)     \
  47         ((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
  48 #define I2SPCR_STOP(stype)      \
  49         ((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
  50 #define I2SPCR_CLRFIFO(stype)   \
  51         ((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
  52
  53
  54 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  55                                unsigned int fmt)
  56 {
  57         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai);
  58         unsigned long ct;
  59         int ret;
  60
  61         ret = -EINVAL;
  62
  63         ct = pscdata->cfg;
  64
  65         ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);        /* left-justified */
  66         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  67         case SND_SOC_DAIFMT_I2S:
  68                 ct |= PSC_I2SCFG_XM;    /* enable I2S mode */
  69                 break;
  70         case SND_SOC_DAIFMT_MSB:
  71                 break;
  72         case SND_SOC_DAIFMT_LSB:
  73                 ct |= PSC_I2SCFG_MLJ;   /* LSB (right-) justified */
  74                 break;
  75         default:
  76                 goto out;
  77         }
  78
  79         ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);         /* IB-IF */
  80         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  81         case SND_SOC_DAIFMT_NB_NF:
  82                 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
  83                 break;
  84         case SND_SOC_DAIFMT_NB_IF:
  85                 ct |= PSC_I2SCFG_BI;
  86                 break;
  87         case SND_SOC_DAIFMT_IB_NF:
  88                 ct |= PSC_I2SCFG_WI;
  89                 break;
  90         case SND_SOC_DAIFMT_IB_IF:
  91                 break;
  92         default:
  93                 goto out;
  94         }
  95
  96         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  97         case SND_SOC_DAIFMT_CBM_CFM:    /* CODEC master */
  98                 ct |= PSC_I2SCFG_MS;    /* PSC I2S slave mode */
  99                 break;
 100         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
 101                 ct &= ~PSC_I2SCFG_MS;   /* PSC I2S Master mode */
 102                 break;
 103         default:
 104                 goto out;
 105         }
 106
 107         pscdata->cfg = ct;
 108         ret = 0;
 109 out:
 110         return ret;
 111 }
 112
 113 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
 114                                  struct snd_pcm_hw_params *params,
 115                                  struct snd_soc_dai *dai)
 116 {
 117         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 118
 119         int cfgbits;
 120         unsigned long stat;
 121
 122         /* check if the PSC is already streaming data */
 123         stat = au_readl(I2S_STAT(pscdata));
 124         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 125                 /* reject parameters not currently set up in hardware */
 126                 cfgbits = au_readl(I2S_CFG(pscdata));
 127                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
 128                     (params_rate(params) != pscdata->rate))
 129                         return -EINVAL;
 130         } else {
 131                 /* set sample bitdepth */
 132                 pscdata->cfg &= ~(0x1f << 4);
 133                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
 134                 /* remember current rate for other stream */
 135                 pscdata->rate = params_rate(params);
 136         }
 137         return 0;
 138 }
 139
 140 /* Configure PSC late:  on my devel systems the codec  is I2S master and
 141  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 142  * uses aggressive PM and  switches the codec off  when it is not in use
 143  * which also means the PSC unit doesn't get any clocks and is therefore
 144  * dead. That's why this chunk here gets called from the trigger callback
 145  * because I can be reasonably certain the codec is driving the clocks.
 146  */
 147 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
 148 {
 149         unsigned long tmo;
 150
 151         /* bring PSC out of sleep, and configure I2S unit */
 152         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 153         au_sync();
 154
 155         tmo = 1000000;
 156         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 157                 tmo--;
 158
 159         if (!tmo)
 160                 goto psc_err;
 161
 162         au_writel(0, I2S_CFG(pscdata));
 163         au_sync();
 164         au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 165         au_sync();
 166
 167         /* wait for I2S controller to become ready */
 168         tmo = 1000000;
 169         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 170                 tmo--;
 171
 172         if (tmo)
 173                 return 0;
 174
 175 psc_err:
 176         au_writel(0, I2S_CFG(pscdata));
 177         au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 178         au_sync();
 179         return -ETIMEDOUT;
 180 }
 181
 182 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
 183 {
 184         unsigned long tmo, stat;
 185         int ret;
 186
 187         ret = 0;
 188
 189         /* if both TX and RX are idle, configure the PSC  */
 190         stat = au_readl(I2S_STAT(pscdata));
 191         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 192                 ret = au1xpsc_i2s_configure(pscdata);
 193                 if (ret)
 194                         goto out;
 195         }
 196
 197         au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 198         au_sync();
 199         au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 200         au_sync();
 201
 202         /* wait for start confirmation */
 203         tmo = 1000000;
 204         while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 205                 tmo--;
 206
 207         if (!tmo) {
 208                 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 209                 au_sync();
 210                 ret = -ETIMEDOUT;
 211         }
 212 out:
 213         return ret;
 214 }
 215
 216 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 217 {
 218         unsigned long tmo, stat;
 219
 220         au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 221         au_sync();
 222
 223         /* wait for stop confirmation */
 224         tmo = 1000000;
 225         while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 226                 tmo--;
 227
 228         /* if both TX and RX are idle, disable PSC */
 229         stat = au_readl(I2S_STAT(pscdata));
 230         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 231                 au_writel(0, I2S_CFG(pscdata));
 232                 au_sync();
 233                 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 234                 au_sync();
 235         }
 236         return 0;
 237 }
 238
 239 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 240                                struct snd_soc_dai *dai)
 241 {
 242         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 243         int ret, stype = SUBSTREAM_TYPE(substream);
 244
 245         switch (cmd) {
 246         case SNDRV_PCM_TRIGGER_START:
 247         case SNDRV_PCM_TRIGGER_RESUME:
 248                 ret = au1xpsc_i2s_start(pscdata, stype);
 249                 break;
 250         case SNDRV_PCM_TRIGGER_STOP:
 251         case SNDRV_PCM_TRIGGER_SUSPEND:
 252                 ret = au1xpsc_i2s_stop(pscdata, stype);
 253                 break;
 254         default:
 255                 ret = -EINVAL;
 256         }
 257         return ret;
 258 }
 259
 260 static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
 261         .trigger        = au1xpsc_i2s_trigger,
 262         .hw_params      = au1xpsc_i2s_hw_params,
 263         .set_fmt        = au1xpsc_i2s_set_fmt,
 264 };
 265
 266 static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = {
 267         .playback = {
 268                 .rates          = AU1XPSC_I2S_RATES,
 269                 .formats        = AU1XPSC_I2S_FMTS,
 270                 .channels_min   = 2,
 271                 .channels_max   = 8,    /* 2 without external help */
 272         },
 273         .capture = {
 274                 .rates          = AU1XPSC_I2S_RATES,
 275                 .formats        = AU1XPSC_I2S_FMTS,
 276                 .channels_min   = 2,
 277                 .channels_max   = 8,    /* 2 without external help */
 278         },
 279         .ops = &au1xpsc_i2s_dai_ops,
 280 };
 281
 282 static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 283 {
 284         struct resource *r;
 285         unsigned long sel;
 286         int ret;
 287         struct au1xpsc_audio_data *wd;
 288
 289         wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 290         if (!wd)
 291                 return -ENOMEM;
 292
 293         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 294         if (!r) {
 295                 ret = -ENODEV;
 296                 goto out0;
 297         }
 298
 299         ret = -EBUSY;
 300         if (!request_mem_region(r->start, resource_size(r), pdev->name))
 301                 goto out0;
 302
 303         wd->mmio = ioremap(r->start, resource_size(r));
 304         if (!wd->mmio)
 305                 goto out1;
 306
 307         /* preserve PSC clock source set up by platform (dev.platform_data
 308          * is already occupied by soc layer)
 309          */
 310         sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 311         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 312         au_sync();
 313         au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
 314         au_writel(0, I2S_CFG(wd));
 315         au_sync();
 316
 317         /* preconfigure: set max rx/tx fifo depths */
 318         wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 319
 320         /* don't wait for I2S core to become ready now; clocks may not
 321          * be running yet; depending on clock input for PSC a wait might
 322          * time out.
 323          */
 324
 325         /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */
 326         memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template,
 327                sizeof(struct snd_soc_dai_driver));
 328         wd->dai_drv.name = dev_name(&pdev->dev);
 329
 330         platform_set_drvdata(pdev, wd);
 331
 332         ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
 333         if (ret)
 334                 goto out1;
 335
 336         /* finally add the DMA device for this PSC */
 337         wd->dmapd = au1xpsc_pcm_add(pdev);
 338         if (wd->dmapd)
 339                 return 0;
 340
 341         snd_soc_unregister_dai(&pdev->dev);
 342 out1:
 343         release_mem_region(r->start, resource_size(r));
 344 out0:
 345         kfree(wd);
 346         return ret;
 347 }
 348
 349 static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
 350 {
 351         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 352         struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 353
 354         if (wd->dmapd)
 355                 au1xpsc_pcm_destroy(wd->dmapd);
 356
 357         snd_soc_unregister_dai(&pdev->dev);
 358
 359         au_writel(0, I2S_CFG(wd));
 360         au_sync();
 361         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 362         au_sync();
 363
 364         iounmap(wd->mmio);
 365         release_mem_region(r->start, resource_size(r));
 366         kfree(wd);
 367
 368         return 0;
 369 }
 370
 371 #ifdef CONFIG_PM
 372 static int au1xpsc_i2s_drvsuspend(struct device *dev)
 373 {
 374         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 375
 376         /* save interesting register and disable PSC */
 377         wd->pm[0] = au_readl(PSC_SEL(wd));
 378
 379         au_writel(0, I2S_CFG(wd));
 380         au_sync();
 381         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 382         au_sync();
 383
 384         return 0;
 385 }
 386
 387 static int au1xpsc_i2s_drvresume(struct device *dev)
 388 {
 389         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 390
 391         /* select I2S mode and PSC clock */
 392         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 393         au_sync();
 394         au_writel(0, PSC_SEL(wd));
 395         au_sync();
 396         au_writel(wd->pm[0], PSC_SEL(wd));
 397         au_sync();
 398
 399         return 0;
 400 }
 401
 402 static struct dev_pm_ops au1xpsci2s_pmops = {
 403         .suspend        = au1xpsc_i2s_drvsuspend,
 404         .resume         = au1xpsc_i2s_drvresume,
 405 };
 406
 407 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
 408
 409 #else
 410
 411 #define AU1XPSCI2S_PMOPS NULL
 412
 413 #endif
 414
 415 static struct platform_driver au1xpsc_i2s_driver = {
 416         .driver         = {
 417                 .name   = "au1xpsc_i2s",
 418                 .owner  = THIS_MODULE,
 419                 .pm     = AU1XPSCI2S_PMOPS,
 420         },
 421         .probe          = au1xpsc_i2s_drvprobe,
 422         .remove         = __devexit_p(au1xpsc_i2s_drvremove),
 423 };
 424
 425 static int __init au1xpsc_i2s_load(void)
 426 {
 427         return platform_driver_register(&au1xpsc_i2s_driver);
 428 }
 429
 430 static void __exit au1xpsc_i2s_unload(void)
 431 {
 432         platform_driver_unregister(&au1xpsc_i2s_driver);
 433 }
 434
 435 module_init(au1xpsc_i2s_load);
 436 module_exit(au1xpsc_i2s_unload);
 437
 438 MODULE_LICENSE("GPL");
 439 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
 440 MODULE_AUTHOR("Manuel Lauss");