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 <mano@roarinelk.homelinux.net>
   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/suspend.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/initval.h>
  25 #include <sound/soc.h>
  26 #include <asm/mach-au1x00/au1000.h>
  27 #include <asm/mach-au1x00/au1xxx_psc.h>
  28
  29 #include "psc.h"
  30
  31 /* supported I2S DAI hardware formats */
  32 #define AU1XPSC_I2S_DAIFMT \
  33         (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |   \
  34          SND_SOC_DAIFMT_NB_NF)
  35
  36 /* supported I2S direction */
  37 #define AU1XPSC_I2S_DIR \
  38         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  39
  40 #define AU1XPSC_I2S_RATES \
  41         SNDRV_PCM_RATE_8000_192000
  42
  43 #define AU1XPSC_I2S_FMTS \
  44         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
  45
  46 #define I2SSTAT_BUSY(stype)     \
  47         ((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
  48 #define I2SPCR_START(stype)     \
  49         ((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
  50 #define I2SPCR_STOP(stype)      \
  51         ((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
  52 #define I2SPCR_CLRFIFO(stype)   \
  53         ((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
  54
  55
  56 /* instance data. There can be only one, MacLeod!!!! */
  57 static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;
  58
  59 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  60                                unsigned int fmt)
  61 {
  62         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
  63         unsigned long ct;
  64         int ret;
  65
  66         ret = -EINVAL;
  67
  68         ct = pscdata->cfg;
  69
  70         ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);        /* left-justified */
  71         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  72         case SND_SOC_DAIFMT_I2S:
  73                 ct |= PSC_I2SCFG_XM;    /* enable I2S mode */
  74                 break;
  75         case SND_SOC_DAIFMT_MSB:
  76                 break;
  77         case SND_SOC_DAIFMT_LSB:
  78                 ct |= PSC_I2SCFG_MLJ;   /* LSB (right-) justified */
  79                 break;
  80         default:
  81                 goto out;
  82         }
  83
  84         ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);         /* IB-IF */
  85         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  86         case SND_SOC_DAIFMT_NB_NF:
  87                 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
  88                 break;
  89         case SND_SOC_DAIFMT_NB_IF:
  90                 ct |= PSC_I2SCFG_BI;
  91                 break;
  92         case SND_SOC_DAIFMT_IB_NF:
  93                 ct |= PSC_I2SCFG_WI;
  94                 break;
  95         case SND_SOC_DAIFMT_IB_IF:
  96                 break;
  97         default:
  98                 goto out;
  99         }
 100
 101         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 102         case SND_SOC_DAIFMT_CBM_CFM:    /* CODEC master */
 103                 ct |= PSC_I2SCFG_MS;    /* PSC I2S slave mode */
 104                 break;
 105         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
 106                 ct &= ~PSC_I2SCFG_MS;   /* PSC I2S Master mode */
 107                 break;
 108         default:
 109                 goto out;
 110         }
 111
 112         pscdata->cfg = ct;
 113         ret = 0;
 114 out:
 115         return ret;
 116 }
 117
 118 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
 119                                  struct snd_pcm_hw_params *params,
 120                                  struct snd_soc_dai *dai)
 121 {
 122         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 123
 124         int cfgbits;
 125         unsigned long stat;
 126
 127         /* check if the PSC is already streaming data */
 128         stat = au_readl(I2S_STAT(pscdata));
 129         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 130                 /* reject parameters not currently set up in hardware */
 131                 cfgbits = au_readl(I2S_CFG(pscdata));
 132                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
 133                     (params_rate(params) != pscdata->rate))
 134                         return -EINVAL;
 135         } else {
 136                 /* set sample bitdepth */
 137                 pscdata->cfg &= ~(0x1f << 4);
 138                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
 139                 /* remember current rate for other stream */
 140                 pscdata->rate = params_rate(params);
 141         }
 142         return 0;
 143 }
 144
 145 /* Configure PSC late:  on my devel systems the codec  is I2S master and
 146  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 147  * uses aggressive PM and  switches the codec off  when it is not in use
 148  * which also means the PSC unit doesn't get any clocks and is therefore
 149  * dead. That's why this chunk here gets called from the trigger callback
 150  * because I can be reasonably certain the codec is driving the clocks.
 151  */
 152 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
 153 {
 154         unsigned long tmo;
 155
 156         /* bring PSC out of sleep, and configure I2S unit */
 157         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 158         au_sync();
 159
 160         tmo = 1000000;
 161         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 162                 tmo--;
 163
 164         if (!tmo)
 165                 goto psc_err;
 166
 167         au_writel(0, I2S_CFG(pscdata));
 168         au_sync();
 169         au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 170         au_sync();
 171
 172         /* wait for I2S controller to become ready */
 173         tmo = 1000000;
 174         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 175                 tmo--;
 176
 177         if (tmo)
 178                 return 0;
 179
 180 psc_err:
 181         au_writel(0, I2S_CFG(pscdata));
 182         au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 183         au_sync();
 184         return -ETIMEDOUT;
 185 }
 186
 187 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
 188 {
 189         unsigned long tmo, stat;
 190         int ret;
 191
 192         ret = 0;
 193
 194         /* if both TX and RX are idle, configure the PSC  */
 195         stat = au_readl(I2S_STAT(pscdata));
 196         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 197                 ret = au1xpsc_i2s_configure(pscdata);
 198                 if (ret)
 199                         goto out;
 200         }
 201
 202         au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 203         au_sync();
 204         au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 205         au_sync();
 206
 207         /* wait for start confirmation */
 208         tmo = 1000000;
 209         while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 210                 tmo--;
 211
 212         if (!tmo) {
 213                 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 214                 au_sync();
 215                 ret = -ETIMEDOUT;
 216         }
 217 out:
 218         return ret;
 219 }
 220
 221 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 222 {
 223         unsigned long tmo, stat;
 224
 225         au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 226         au_sync();
 227
 228         /* wait for stop confirmation */
 229         tmo = 1000000;
 230         while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 231                 tmo--;
 232
 233         /* if both TX and RX are idle, disable PSC */
 234         stat = au_readl(I2S_STAT(pscdata));
 235         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 236                 au_writel(0, I2S_CFG(pscdata));
 237                 au_sync();
 238                 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 239                 au_sync();
 240         }
 241         return 0;
 242 }
 243
 244 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 245                                struct snd_soc_dai *dai)
 246 {
 247         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 248         int ret, stype = SUBSTREAM_TYPE(substream);
 249
 250         switch (cmd) {
 251         case SNDRV_PCM_TRIGGER_START:
 252         case SNDRV_PCM_TRIGGER_RESUME:
 253                 ret = au1xpsc_i2s_start(pscdata, stype);
 254                 break;
 255         case SNDRV_PCM_TRIGGER_STOP:
 256         case SNDRV_PCM_TRIGGER_SUSPEND:
 257                 ret = au1xpsc_i2s_stop(pscdata, stype);
 258                 break;
 259         default:
 260                 ret = -EINVAL;
 261         }
 262         return ret;
 263 }
 264
 265 static int au1xpsc_i2s_probe(struct platform_device *pdev,
 266                              struct snd_soc_dai *dai)
 267 {
 268         struct resource *r;
 269         unsigned long sel;
 270         int ret;
 271
 272         if (au1xpsc_i2s_workdata)
 273                 return -EBUSY;
 274
 275         au1xpsc_i2s_workdata =
 276                 kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 277         if (!au1xpsc_i2s_workdata)
 278                 return -ENOMEM;
 279
 280         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 281         if (!r) {
 282                 ret = -ENODEV;
 283                 goto out0;
 284         }
 285
 286         ret = -EBUSY;
 287         au1xpsc_i2s_workdata->ioarea =
 288                 request_mem_region(r->start, r->end - r->start + 1,
 289                                         "au1xpsc_i2s");
 290         if (!au1xpsc_i2s_workdata->ioarea)
 291                 goto out0;
 292
 293         au1xpsc_i2s_workdata->mmio = ioremap(r->start, 0xffff);
 294         if (!au1xpsc_i2s_workdata->mmio)
 295                 goto out1;
 296
 297         /* preserve PSC clock source set up by platform (dev.platform_data
 298          * is already occupied by soc layer)
 299          */
 300         sel = au_readl(PSC_SEL(au1xpsc_i2s_workdata)) & PSC_SEL_CLK_MASK;
 301         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 302         au_sync();
 303         au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(au1xpsc_i2s_workdata));
 304         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 305         au_sync();
 306
 307         /* preconfigure: set max rx/tx fifo depths */
 308         au1xpsc_i2s_workdata->cfg |=
 309                         PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 310
 311         /* don't wait for I2S core to become ready now; clocks may not
 312          * be running yet; depending on clock input for PSC a wait might
 313          * time out.
 314          */
 315
 316         return 0;
 317
 318 out1:
 319         release_resource(au1xpsc_i2s_workdata->ioarea);
 320         kfree(au1xpsc_i2s_workdata->ioarea);
 321 out0:
 322         kfree(au1xpsc_i2s_workdata);
 323         au1xpsc_i2s_workdata = NULL;
 324         return ret;
 325 }
 326
 327 static void au1xpsc_i2s_remove(struct platform_device *pdev,
 328                                struct snd_soc_dai *dai)
 329 {
 330         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 331         au_sync();
 332         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 333         au_sync();
 334
 335         iounmap(au1xpsc_i2s_workdata->mmio);
 336         release_resource(au1xpsc_i2s_workdata->ioarea);
 337         kfree(au1xpsc_i2s_workdata->ioarea);
 338         kfree(au1xpsc_i2s_workdata);
 339         au1xpsc_i2s_workdata = NULL;
 340 }
 341
 342 static int au1xpsc_i2s_suspend(struct snd_soc_dai *cpu_dai)
 343 {
 344         /* save interesting register and disable PSC */
 345         au1xpsc_i2s_workdata->pm[0] =
 346                 au_readl(PSC_SEL(au1xpsc_i2s_workdata));
 347
 348         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 349         au_sync();
 350         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 351         au_sync();
 352
 353         return 0;
 354 }
 355
 356 static int au1xpsc_i2s_resume(struct snd_soc_dai *cpu_dai)
 357 {
 358         /* select I2S mode and PSC clock */
 359         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 360         au_sync();
 361         au_writel(0, PSC_SEL(au1xpsc_i2s_workdata));
 362         au_sync();
 363         au_writel(au1xpsc_i2s_workdata->pm[0],
 364                         PSC_SEL(au1xpsc_i2s_workdata));
 365         au_sync();
 366
 367         return 0;
 368 }
 369
 370 static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
 371         .trigger        = au1xpsc_i2s_trigger,
 372         .hw_params      = au1xpsc_i2s_hw_params,
 373         .set_fmt        = au1xpsc_i2s_set_fmt,
 374 };
 375
 376 struct snd_soc_dai au1xpsc_i2s_dai = {
 377         .name                   = "au1xpsc_i2s",
 378         .probe                  = au1xpsc_i2s_probe,
 379         .remove                 = au1xpsc_i2s_remove,
 380         .suspend                = au1xpsc_i2s_suspend,
 381         .resume                 = au1xpsc_i2s_resume,
 382         .playback = {
 383                 .rates          = AU1XPSC_I2S_RATES,
 384                 .formats        = AU1XPSC_I2S_FMTS,
 385                 .channels_min   = 2,
 386                 .channels_max   = 8,    /* 2 without external help */
 387         },
 388         .capture = {
 389                 .rates          = AU1XPSC_I2S_RATES,
 390                 .formats        = AU1XPSC_I2S_FMTS,
 391                 .channels_min   = 2,
 392                 .channels_max   = 8,    /* 2 without external help */
 393         },
 394         .ops = &au1xpsc_i2s_dai_ops,
 395 };
 396 EXPORT_SYMBOL(au1xpsc_i2s_dai);
 397
 398 static int __init au1xpsc_i2s_init(void)
 399 {
 400         au1xpsc_i2s_workdata = NULL;
 401         return snd_soc_register_dai(&au1xpsc_i2s_dai);
 402 }
 403
 404 static void __exit au1xpsc_i2s_exit(void)
 405 {
 406         snd_soc_unregister_dai(&au1xpsc_i2s_dai);
 407 }
 408
 409 module_init(au1xpsc_i2s_init);
 410 module_exit(au1xpsc_i2s_exit);
 411
 412 MODULE_LICENSE("GPL");
 413 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
 414 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");