release/src-rt-6.x.4708/linux/linux-2.6.36/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: all of these drivers can only work with a SINGLE instance
  14  *       of a PSC. Multiple independent audio devices are impossible
  15  *       with ASoC v1.
  16  * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/suspend.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/initval.h>
  26 #include <sound/soc.h>
  27 #include <asm/mach-au1x00/au1000.h>
  28 #include <asm/mach-au1x00/au1xxx_psc.h>
  29
  30 #include "psc.h"
  31
  32 /* supported I2S DAI hardware formats */
  33 #define AU1XPSC_I2S_DAIFMT \
  34         (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |   \
  35          SND_SOC_DAIFMT_NB_NF)
  36
  37 /* supported I2S direction */
  38 #define AU1XPSC_I2S_DIR \
  39         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  40
  41 #define AU1XPSC_I2S_RATES \
  42         SNDRV_PCM_RATE_8000_192000
  43
  44 #define AU1XPSC_I2S_FMTS \
  45         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
  46
  47 #define I2SSTAT_BUSY(stype)     \
  48         ((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
  49 #define I2SPCR_START(stype)     \
  50         ((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
  51 #define I2SPCR_STOP(stype)      \
  52         ((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
  53 #define I2SPCR_CLRFIFO(stype)   \
  54         ((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
  55
  56
  57 /* instance data. There can be only one, MacLeod!!!! */
  58 static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;
  59
  60 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  61                                unsigned int fmt)
  62 {
  63         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
  64         unsigned long ct;
  65         int ret;
  66
  67         ret = -EINVAL;
  68
  69         ct = pscdata->cfg;
  70
  71         ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);        /* left-justified */
  72         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  73         case SND_SOC_DAIFMT_I2S:
  74                 ct |= PSC_I2SCFG_XM;    /* enable I2S mode */
  75                 break;
  76         case SND_SOC_DAIFMT_MSB:
  77                 break;
  78         case SND_SOC_DAIFMT_LSB:
  79                 ct |= PSC_I2SCFG_MLJ;   /* LSB (right-) justified */
  80                 break;
  81         default:
  82                 goto out;
  83         }
  84
  85         ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);         /* IB-IF */
  86         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  87         case SND_SOC_DAIFMT_NB_NF:
  88                 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
  89                 break;
  90         case SND_SOC_DAIFMT_NB_IF:
  91                 ct |= PSC_I2SCFG_BI;
  92                 break;
  93         case SND_SOC_DAIFMT_IB_NF:
  94                 ct |= PSC_I2SCFG_WI;
  95                 break;
  96         case SND_SOC_DAIFMT_IB_IF:
  97                 break;
  98         default:
  99                 goto out;
 100         }
 101
 102         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 103         case SND_SOC_DAIFMT_CBM_CFM:    /* CODEC master */
 104                 ct |= PSC_I2SCFG_MS;    /* PSC I2S slave mode */
 105                 break;
 106         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
 107                 ct &= ~PSC_I2SCFG_MS;   /* PSC I2S Master mode */
 108                 break;
 109         default:
 110                 goto out;
 111         }
 112
 113         pscdata->cfg = ct;
 114         ret = 0;
 115 out:
 116         return ret;
 117 }
 118
 119 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
 120                                  struct snd_pcm_hw_params *params,
 121                                  struct snd_soc_dai *dai)
 122 {
 123         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 124
 125         int cfgbits;
 126         unsigned long stat;
 127
 128         /* check if the PSC is already streaming data */
 129         stat = au_readl(I2S_STAT(pscdata));
 130         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 131                 /* reject parameters not currently set up in hardware */
 132                 cfgbits = au_readl(I2S_CFG(pscdata));
 133                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
 134                     (params_rate(params) != pscdata->rate))
 135                         return -EINVAL;
 136         } else {
 137                 /* set sample bitdepth */
 138                 pscdata->cfg &= ~(0x1f << 4);
 139                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
 140                 /* remember current rate for other stream */
 141                 pscdata->rate = params_rate(params);
 142         }
 143         return 0;
 144 }
 145
 146 /* Configure PSC late:  on my devel systems the codec  is I2S master and
 147  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 148  * uses aggressive PM and  switches the codec off  when it is not in use
 149  * which also means the PSC unit doesn't get any clocks and is therefore
 150  * dead. That's why this chunk here gets called from the trigger callback
 151  * because I can be reasonably certain the codec is driving the clocks.
 152  */
 153 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
 154 {
 155         unsigned long tmo;
 156
 157         /* bring PSC out of sleep, and configure I2S unit */
 158         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 159         au_sync();
 160
 161         tmo = 1000000;
 162         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 163                 tmo--;
 164
 165         if (!tmo)
 166                 goto psc_err;
 167
 168         au_writel(0, I2S_CFG(pscdata));
 169         au_sync();
 170         au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 171         au_sync();
 172
 173         /* wait for I2S controller to become ready */
 174         tmo = 1000000;
 175         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 176                 tmo--;
 177
 178         if (tmo)
 179                 return 0;
 180
 181 psc_err:
 182         au_writel(0, I2S_CFG(pscdata));
 183         au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 184         au_sync();
 185         return -ETIMEDOUT;
 186 }
 187
 188 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
 189 {
 190         unsigned long tmo, stat;
 191         int ret;
 192
 193         ret = 0;
 194
 195         /* if both TX and RX are idle, configure the PSC  */
 196         stat = au_readl(I2S_STAT(pscdata));
 197         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 198                 ret = au1xpsc_i2s_configure(pscdata);
 199                 if (ret)
 200                         goto out;
 201         }
 202
 203         au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 204         au_sync();
 205         au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 206         au_sync();
 207
 208         /* wait for start confirmation */
 209         tmo = 1000000;
 210         while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 211                 tmo--;
 212
 213         if (!tmo) {
 214                 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 215                 au_sync();
 216                 ret = -ETIMEDOUT;
 217         }
 218 out:
 219         return ret;
 220 }
 221
 222 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 223 {
 224         unsigned long tmo, stat;
 225
 226         au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 227         au_sync();
 228
 229         /* wait for stop confirmation */
 230         tmo = 1000000;
 231         while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 232                 tmo--;
 233
 234         /* if both TX and RX are idle, disable PSC */
 235         stat = au_readl(I2S_STAT(pscdata));
 236         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 237                 au_writel(0, I2S_CFG(pscdata));
 238                 au_sync();
 239                 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 240                 au_sync();
 241         }
 242         return 0;
 243 }
 244
 245 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 246                                struct snd_soc_dai *dai)
 247 {
 248         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 249         int ret, stype = SUBSTREAM_TYPE(substream);
 250
 251         switch (cmd) {
 252         case SNDRV_PCM_TRIGGER_START:
 253         case SNDRV_PCM_TRIGGER_RESUME:
 254                 ret = au1xpsc_i2s_start(pscdata, stype);
 255                 break;
 256         case SNDRV_PCM_TRIGGER_STOP:
 257         case SNDRV_PCM_TRIGGER_SUSPEND:
 258                 ret = au1xpsc_i2s_stop(pscdata, stype);
 259                 break;
 260         default:
 261                 ret = -EINVAL;
 262         }
 263         return ret;
 264 }
 265
 266 static int au1xpsc_i2s_probe(struct platform_device *pdev,
 267                              struct snd_soc_dai *dai)
 268 {
 269         return  au1xpsc_i2s_workdata ? 0 : -ENODEV;
 270 }
 271
 272 static void au1xpsc_i2s_remove(struct platform_device *pdev,
 273                                struct snd_soc_dai *dai)
 274 {
 275 }
 276
 277 static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
 278         .trigger        = au1xpsc_i2s_trigger,
 279         .hw_params      = au1xpsc_i2s_hw_params,
 280         .set_fmt        = au1xpsc_i2s_set_fmt,
 281 };
 282
 283 struct snd_soc_dai au1xpsc_i2s_dai = {
 284         .name                   = "au1xpsc_i2s",
 285         .probe                  = au1xpsc_i2s_probe,
 286         .remove                 = au1xpsc_i2s_remove,
 287         .playback = {
 288                 .rates          = AU1XPSC_I2S_RATES,
 289                 .formats        = AU1XPSC_I2S_FMTS,
 290                 .channels_min   = 2,
 291                 .channels_max   = 8,    /* 2 without external help */
 292         },
 293         .capture = {
 294                 .rates          = AU1XPSC_I2S_RATES,
 295                 .formats        = AU1XPSC_I2S_FMTS,
 296                 .channels_min   = 2,
 297                 .channels_max   = 8,    /* 2 without external help */
 298         },
 299         .ops = &au1xpsc_i2s_dai_ops,
 300 };
 301 EXPORT_SYMBOL(au1xpsc_i2s_dai);
 302
 303 static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 304 {
 305         struct resource *r;
 306         unsigned long sel;
 307         int ret;
 308         struct au1xpsc_audio_data *wd;
 309
 310         if (au1xpsc_i2s_workdata)
 311                 return -EBUSY;
 312
 313         wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 314         if (!wd)
 315                 return -ENOMEM;
 316
 317         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 318         if (!r) {
 319                 ret = -ENODEV;
 320                 goto out0;
 321         }
 322
 323         ret = -EBUSY;
 324         if (!request_mem_region(r->start, resource_size(r), pdev->name))
 325                 goto out0;
 326
 327         wd->mmio = ioremap(r->start, resource_size(r));
 328         if (!wd->mmio)
 329                 goto out1;
 330
 331         /* preserve PSC clock source set up by platform (dev.platform_data
 332          * is already occupied by soc layer)
 333          */
 334         sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 335         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 336         au_sync();
 337         au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
 338         au_writel(0, I2S_CFG(wd));
 339         au_sync();
 340
 341         /* preconfigure: set max rx/tx fifo depths */
 342         wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 343
 344         /* don't wait for I2S core to become ready now; clocks may not
 345          * be running yet; depending on clock input for PSC a wait might
 346          * time out.
 347          */
 348
 349         ret = snd_soc_register_dai(&au1xpsc_i2s_dai);
 350         if (ret)
 351                 goto out1;
 352
 353         /* finally add the DMA device for this PSC */
 354         wd->dmapd = au1xpsc_pcm_add(pdev);
 355         if (wd->dmapd) {
 356                 platform_set_drvdata(pdev, wd);
 357                 au1xpsc_i2s_workdata = wd;
 358                 return 0;
 359         }
 360
 361         snd_soc_unregister_dai(&au1xpsc_i2s_dai);
 362 out1:
 363         release_mem_region(r->start, resource_size(r));
 364 out0:
 365         kfree(wd);
 366         return ret;
 367 }
 368
 369 static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
 370 {
 371         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 372         struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 373
 374         if (wd->dmapd)
 375                 au1xpsc_pcm_destroy(wd->dmapd);
 376
 377         snd_soc_unregister_dai(&au1xpsc_i2s_dai);
 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         iounmap(wd->mmio);
 385         release_mem_region(r->start, resource_size(r));
 386         kfree(wd);
 387
 388         au1xpsc_i2s_workdata = NULL;    /* MDEV */
 389
 390         return 0;
 391 }
 392
 393 #ifdef CONFIG_PM
 394 static int au1xpsc_i2s_drvsuspend(struct device *dev)
 395 {
 396         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 397
 398         /* save interesting register and disable PSC */
 399         wd->pm[0] = au_readl(PSC_SEL(wd));
 400
 401         au_writel(0, I2S_CFG(wd));
 402         au_sync();
 403         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 404         au_sync();
 405
 406         return 0;
 407 }
 408
 409 static int au1xpsc_i2s_drvresume(struct device *dev)
 410 {
 411         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 412
 413         /* select I2S mode and PSC clock */
 414         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 415         au_sync();
 416         au_writel(0, PSC_SEL(wd));
 417         au_sync();
 418         au_writel(wd->pm[0], PSC_SEL(wd));
 419         au_sync();
 420
 421         return 0;
 422 }
 423
 424 static struct dev_pm_ops au1xpsci2s_pmops = {
 425         .suspend        = au1xpsc_i2s_drvsuspend,
 426         .resume         = au1xpsc_i2s_drvresume,
 427 };
 428
 429 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
 430
 431 #else
 432
 433 #define AU1XPSCI2S_PMOPS NULL
 434
 435 #endif
 436
 437 static struct platform_driver au1xpsc_i2s_driver = {
 438         .driver         = {
 439                 .name   = "au1xpsc_i2s",
 440                 .owner  = THIS_MODULE,
 441                 .pm     = AU1XPSCI2S_PMOPS,
 442         },
 443         .probe          = au1xpsc_i2s_drvprobe,
 444         .remove         = __devexit_p(au1xpsc_i2s_drvremove),
 445 };
 446
 447 static int __init au1xpsc_i2s_load(void)
 448 {
 449         au1xpsc_i2s_workdata = NULL;
 450         return platform_driver_register(&au1xpsc_i2s_driver);
 451 }
 452
 453 static void __exit au1xpsc_i2s_unload(void)
 454 {
 455         platform_driver_unregister(&au1xpsc_i2s_driver);
 456 }
 457
 458 module_init(au1xpsc_i2s_load);
 459 module_exit(au1xpsc_i2s_unload);
 460
 461 MODULE_LICENSE("GPL");
 462 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
 463 MODULE_AUTHOR("Manuel Lauss");