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 {
 121         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 122
 123         int cfgbits;
 124         unsigned long stat;
 125
 126         /* check if the PSC is already streaming data */
 127         stat = au_readl(I2S_STAT(pscdata));
 128         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 129                 /* reject parameters not currently set up in hardware */
 130                 cfgbits = au_readl(I2S_CFG(pscdata));
 131                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
 132                     (params_rate(params) != pscdata->rate))
 133                         return -EINVAL;
 134         } else {
 135                 /* set sample bitdepth */
 136                 pscdata->cfg &= ~(0x1f << 4);
 137                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
 138                 /* remember current rate for other stream */
 139                 pscdata->rate = params_rate(params);
 140         }
 141         return 0;
 142 }
 143
 144 /* Configure PSC late:  on my devel systems the codec  is I2S master and
 145  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 146  * uses aggressive PM and  switches the codec off  when it is not in use
 147  * which also means the PSC unit doesn't get any clocks and is therefore
 148  * dead. That's why this chunk here gets called from the trigger callback
 149  * because I can be reasonably certain the codec is driving the clocks.
 150  */
 151 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
 152 {
 153         unsigned long tmo;
 154
 155         /* bring PSC out of sleep, and configure I2S unit */
 156         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 157         au_sync();
 158
 159         tmo = 1000000;
 160         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 161                 tmo--;
 162
 163         if (!tmo)
 164                 goto psc_err;
 165
 166         au_writel(0, I2S_CFG(pscdata));
 167         au_sync();
 168         au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 169         au_sync();
 170
 171         /* wait for I2S controller to become ready */
 172         tmo = 1000000;
 173         while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 174                 tmo--;
 175
 176         if (tmo)
 177                 return 0;
 178
 179 psc_err:
 180         au_writel(0, I2S_CFG(pscdata));
 181         au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 182         au_sync();
 183         return -ETIMEDOUT;
 184 }
 185
 186 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
 187 {
 188         unsigned long tmo, stat;
 189         int ret;
 190
 191         ret = 0;
 192
 193         /* if both TX and RX are idle, configure the PSC  */
 194         stat = au_readl(I2S_STAT(pscdata));
 195         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 196                 ret = au1xpsc_i2s_configure(pscdata);
 197                 if (ret)
 198                         goto out;
 199         }
 200
 201         au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 202         au_sync();
 203         au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 204         au_sync();
 205
 206         /* wait for start confirmation */
 207         tmo = 1000000;
 208         while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 209                 tmo--;
 210
 211         if (!tmo) {
 212                 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 213                 au_sync();
 214                 ret = -ETIMEDOUT;
 215         }
 216 out:
 217         return ret;
 218 }
 219
 220 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 221 {
 222         unsigned long tmo, stat;
 223
 224         au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 225         au_sync();
 226
 227         /* wait for stop confirmation */
 228         tmo = 1000000;
 229         while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 230                 tmo--;
 231
 232         /* if both TX and RX are idle, disable PSC */
 233         stat = au_readl(I2S_STAT(pscdata));
 234         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 235                 au_writel(0, I2S_CFG(pscdata));
 236                 au_sync();
 237                 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 238                 au_sync();
 239         }
 240         return 0;
 241 }
 242
 243 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
 244 {
 245         struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
 246         int ret, stype = SUBSTREAM_TYPE(substream);
 247
 248         switch (cmd) {
 249         case SNDRV_PCM_TRIGGER_START:
 250         case SNDRV_PCM_TRIGGER_RESUME:
 251                 ret = au1xpsc_i2s_start(pscdata, stype);
 252                 break;
 253         case SNDRV_PCM_TRIGGER_STOP:
 254         case SNDRV_PCM_TRIGGER_SUSPEND:
 255                 ret = au1xpsc_i2s_stop(pscdata, stype);
 256                 break;
 257         default:
 258                 ret = -EINVAL;
 259         }
 260         return ret;
 261 }
 262
 263 static int au1xpsc_i2s_probe(struct platform_device *pdev,
 264                              struct snd_soc_dai *dai)
 265 {
 266         struct resource *r;
 267         unsigned long sel;
 268         int ret;
 269
 270         if (au1xpsc_i2s_workdata)
 271                 return -EBUSY;
 272
 273         au1xpsc_i2s_workdata =
 274                 kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 275         if (!au1xpsc_i2s_workdata)
 276                 return -ENOMEM;
 277
 278         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 279         if (!r) {
 280                 ret = -ENODEV;
 281                 goto out0;
 282         }
 283
 284         ret = -EBUSY;
 285         au1xpsc_i2s_workdata->ioarea =
 286                 request_mem_region(r->start, r->end - r->start + 1,
 287                                         "au1xpsc_i2s");
 288         if (!au1xpsc_i2s_workdata->ioarea)
 289                 goto out0;
 290
 291         au1xpsc_i2s_workdata->mmio = ioremap(r->start, 0xffff);
 292         if (!au1xpsc_i2s_workdata->mmio)
 293                 goto out1;
 294
 295         /* preserve PSC clock source set up by platform (dev.platform_data
 296          * is already occupied by soc layer)
 297          */
 298         sel = au_readl(PSC_SEL(au1xpsc_i2s_workdata)) & PSC_SEL_CLK_MASK;
 299         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 300         au_sync();
 301         au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(au1xpsc_i2s_workdata));
 302         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 303         au_sync();
 304
 305         /* preconfigure: set max rx/tx fifo depths */
 306         au1xpsc_i2s_workdata->cfg |=
 307                         PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 308
 309         /* don't wait for I2S core to become ready now; clocks may not
 310          * be running yet; depending on clock input for PSC a wait might
 311          * time out.
 312          */
 313
 314         return 0;
 315
 316 out1:
 317         release_resource(au1xpsc_i2s_workdata->ioarea);
 318         kfree(au1xpsc_i2s_workdata->ioarea);
 319 out0:
 320         kfree(au1xpsc_i2s_workdata);
 321         au1xpsc_i2s_workdata = NULL;
 322         return ret;
 323 }
 324
 325 static void au1xpsc_i2s_remove(struct platform_device *pdev,
 326                                struct snd_soc_dai *dai)
 327 {
 328         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 329         au_sync();
 330         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 331         au_sync();
 332
 333         iounmap(au1xpsc_i2s_workdata->mmio);
 334         release_resource(au1xpsc_i2s_workdata->ioarea);
 335         kfree(au1xpsc_i2s_workdata->ioarea);
 336         kfree(au1xpsc_i2s_workdata);
 337         au1xpsc_i2s_workdata = NULL;
 338 }
 339
 340 static int au1xpsc_i2s_suspend(struct platform_device *pdev,
 341                                struct snd_soc_dai *cpu_dai)
 342 {
 343         /* save interesting register and disable PSC */
 344         au1xpsc_i2s_workdata->pm[0] =
 345                 au_readl(PSC_SEL(au1xpsc_i2s_workdata));
 346
 347         au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
 348         au_sync();
 349         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
 350         au_sync();
 351
 352         return 0;
 353 }
 354
 355 static int au1xpsc_i2s_resume(struct platform_device *pdev,
 356                               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 struct snd_soc_dai au1xpsc_i2s_dai = {
 371         .name                   = "au1xpsc_i2s",
 372         .type                   = SND_SOC_DAI_I2S,
 373         .probe                  = au1xpsc_i2s_probe,
 374         .remove                 = au1xpsc_i2s_remove,
 375         .suspend                = au1xpsc_i2s_suspend,
 376         .resume                 = au1xpsc_i2s_resume,
 377         .playback = {
 378                 .rates          = AU1XPSC_I2S_RATES,
 379                 .formats        = AU1XPSC_I2S_FMTS,
 380                 .channels_min   = 2,
 381                 .channels_max   = 8,    /* 2 without external help */
 382         },
 383         .capture = {
 384                 .rates          = AU1XPSC_I2S_RATES,
 385                 .formats        = AU1XPSC_I2S_FMTS,
 386                 .channels_min   = 2,
 387                 .channels_max   = 8,    /* 2 without external help */
 388         },
 389         .ops = {
 390                 .trigger        = au1xpsc_i2s_trigger,
 391                 .hw_params      = au1xpsc_i2s_hw_params,
 392         },
 393         .dai_ops = {
 394                 .set_fmt        = au1xpsc_i2s_set_fmt,
 395         },
 396 };
 397 EXPORT_SYMBOL(au1xpsc_i2s_dai);
 398
 399 static int __init au1xpsc_i2s_init(void)
 400 {
 401         au1xpsc_i2s_workdata = NULL;
 402         return 0;
 403 }
 404
 405 static void __exit au1xpsc_i2s_exit(void)
 406 {
 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>");