root/sound/soc/au1x/psc-i2s.c

DEFINITIONS

1. au1xpsc_i2s_set_fmt
2. au1xpsc_i2s_hw_params
3. au1xpsc_i2s_configure
4. au1xpsc_i2s_start
5. au1xpsc_i2s_stop
6. au1xpsc_i2s_trigger
7. au1xpsc_i2s_startup
8. au1xpsc_i2s_drvprobe
9. au1xpsc_i2s_drvremove
10. au1xpsc_i2s_drvsuspend
11. au1xpsc_i2s_drvresume

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   4  *
   5  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
   6  *      Manuel Lauss <manuel.lauss@gmail.com>
   7  *
   8  * Au1xxx-PSC I2S glue.
   9  *
  10  * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
  11  */
  12 
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/suspend.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/initval.h>
  20 #include <sound/soc.h>
  21 #include <asm/mach-au1x00/au1000.h>
  22 #include <asm/mach-au1x00/au1xxx_psc.h>
  23 
  24 #include "psc.h"
  25 
  26 /* supported I2S DAI hardware formats */
  27 #define AU1XPSC_I2S_DAIFMT \
  28         (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |   \
  29          SND_SOC_DAIFMT_NB_NF)
  30 
  31 /* supported I2S direction */
  32 #define AU1XPSC_I2S_DIR \
  33         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  34 
  35 #define AU1XPSC_I2S_RATES \
  36         SNDRV_PCM_RATE_8000_192000
  37 
  38 #define AU1XPSC_I2S_FMTS \
  39         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
  40 
  41 #define I2SSTAT_BUSY(stype)     \
  42         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
  43 #define I2SPCR_START(stype)     \
  44         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
  45 #define I2SPCR_STOP(stype)      \
  46         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
  47 #define I2SPCR_CLRFIFO(stype)   \
  48         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
  49 
  50 
  51 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  52                                unsigned int fmt)
  53 {
  54         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai);
  55         unsigned long ct;
  56         int ret;
  57 
  58         ret = -EINVAL;
  59 
  60         ct = pscdata->cfg;
  61 
  62         ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);        /* left-justified */
  63         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  64         case SND_SOC_DAIFMT_I2S:
  65                 ct |= PSC_I2SCFG_XM;    /* enable I2S mode */
  66                 break;
  67         case SND_SOC_DAIFMT_MSB:
  68                 break;
  69         case SND_SOC_DAIFMT_LSB:
  70                 ct |= PSC_I2SCFG_MLJ;   /* LSB (right-) justified */
  71                 break;
  72         default:
  73                 goto out;
  74         }
  75 
  76         ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);         /* IB-IF */
  77         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  78         case SND_SOC_DAIFMT_NB_NF:
  79                 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
  80                 break;
  81         case SND_SOC_DAIFMT_NB_IF:
  82                 ct |= PSC_I2SCFG_BI;
  83                 break;
  84         case SND_SOC_DAIFMT_IB_NF:
  85                 ct |= PSC_I2SCFG_WI;
  86                 break;
  87         case SND_SOC_DAIFMT_IB_IF:
  88                 break;
  89         default:
  90                 goto out;
  91         }
  92 
  93         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  94         case SND_SOC_DAIFMT_CBM_CFM:    /* CODEC master */
  95                 ct |= PSC_I2SCFG_MS;    /* PSC I2S slave mode */
  96                 break;
  97         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
  98                 ct &= ~PSC_I2SCFG_MS;   /* PSC I2S Master mode */
  99                 break;
 100         default:
 101                 goto out;
 102         }
 103 
 104         pscdata->cfg = ct;
 105         ret = 0;
 106 out:
 107         return ret;
 108 }
 109 
 110 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
 111                                  struct snd_pcm_hw_params *params,
 112                                  struct snd_soc_dai *dai)
 113 {
 114         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 115 
 116         int cfgbits;
 117         unsigned long stat;
 118 
 119         /* check if the PSC is already streaming data */
 120         stat = __raw_readl(I2S_STAT(pscdata));
 121         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 122                 /* reject parameters not currently set up in hardware */
 123                 cfgbits = __raw_readl(I2S_CFG(pscdata));
 124                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
 125                     (params_rate(params) != pscdata->rate))
 126                         return -EINVAL;
 127         } else {
 128                 /* set sample bitdepth */
 129                 pscdata->cfg &= ~(0x1f << 4);
 130                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
 131                 /* remember current rate for other stream */
 132                 pscdata->rate = params_rate(params);
 133         }
 134         return 0;
 135 }
 136 
 137 /* Configure PSC late:  on my devel systems the codec  is I2S master and
 138  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 139  * uses aggressive PM and  switches the codec off  when it is not in use
 140  * which also means the PSC unit doesn't get any clocks and is therefore
 141  * dead. That's why this chunk here gets called from the trigger callback
 142  * because I can be reasonably certain the codec is driving the clocks.
 143  */
 144 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
 145 {
 146         unsigned long tmo;
 147 
 148         /* bring PSC out of sleep, and configure I2S unit */
 149         __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 150         wmb(); /* drain writebuffer */
 151 
 152         tmo = 1000000;
 153         while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 154                 tmo--;
 155 
 156         if (!tmo)
 157                 goto psc_err;
 158 
 159         __raw_writel(0, I2S_CFG(pscdata));
 160         wmb(); /* drain writebuffer */
 161         __raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 162         wmb(); /* drain writebuffer */
 163 
 164         /* wait for I2S controller to become ready */
 165         tmo = 1000000;
 166         while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 167                 tmo--;
 168 
 169         if (tmo)
 170                 return 0;
 171 
 172 psc_err:
 173         __raw_writel(0, I2S_CFG(pscdata));
 174         __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 175         wmb(); /* drain writebuffer */
 176         return -ETIMEDOUT;
 177 }
 178 
 179 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
 180 {
 181         unsigned long tmo, stat;
 182         int ret;
 183 
 184         ret = 0;
 185 
 186         /* if both TX and RX are idle, configure the PSC  */
 187         stat = __raw_readl(I2S_STAT(pscdata));
 188         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 189                 ret = au1xpsc_i2s_configure(pscdata);
 190                 if (ret)
 191                         goto out;
 192         }
 193 
 194         __raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 195         wmb(); /* drain writebuffer */
 196         __raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 197         wmb(); /* drain writebuffer */
 198 
 199         /* wait for start confirmation */
 200         tmo = 1000000;
 201         while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 202                 tmo--;
 203 
 204         if (!tmo) {
 205                 __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 206                 wmb(); /* drain writebuffer */
 207                 ret = -ETIMEDOUT;
 208         }
 209 out:
 210         return ret;
 211 }
 212 
 213 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 214 {
 215         unsigned long tmo, stat;
 216 
 217         __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 218         wmb(); /* drain writebuffer */
 219 
 220         /* wait for stop confirmation */
 221         tmo = 1000000;
 222         while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 223                 tmo--;
 224 
 225         /* if both TX and RX are idle, disable PSC */
 226         stat = __raw_readl(I2S_STAT(pscdata));
 227         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 228                 __raw_writel(0, I2S_CFG(pscdata));
 229                 wmb(); /* drain writebuffer */
 230                 __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 231                 wmb(); /* drain writebuffer */
 232         }
 233         return 0;
 234 }
 235 
 236 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 237                                struct snd_soc_dai *dai)
 238 {
 239         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 240         int ret, stype = substream->stream;
 241 
 242         switch (cmd) {
 243         case SNDRV_PCM_TRIGGER_START:
 244         case SNDRV_PCM_TRIGGER_RESUME:
 245                 ret = au1xpsc_i2s_start(pscdata, stype);
 246                 break;
 247         case SNDRV_PCM_TRIGGER_STOP:
 248         case SNDRV_PCM_TRIGGER_SUSPEND:
 249                 ret = au1xpsc_i2s_stop(pscdata, stype);
 250                 break;
 251         default:
 252                 ret = -EINVAL;
 253         }
 254         return ret;
 255 }
 256 
 257 static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream,
 258                                struct snd_soc_dai *dai)
 259 {
 260         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 261         snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
 262         return 0;
 263 }
 264 
 265 static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
 266         .startup        = au1xpsc_i2s_startup,
 267         .trigger        = au1xpsc_i2s_trigger,
 268         .hw_params      = au1xpsc_i2s_hw_params,
 269         .set_fmt        = au1xpsc_i2s_set_fmt,
 270 };
 271 
 272 static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = {
 273         .playback = {
 274                 .rates          = AU1XPSC_I2S_RATES,
 275                 .formats        = AU1XPSC_I2S_FMTS,
 276                 .channels_min   = 2,
 277                 .channels_max   = 8,    /* 2 without external help */
 278         },
 279         .capture = {
 280                 .rates          = AU1XPSC_I2S_RATES,
 281                 .formats        = AU1XPSC_I2S_FMTS,
 282                 .channels_min   = 2,
 283                 .channels_max   = 8,    /* 2 without external help */
 284         },
 285         .ops = &au1xpsc_i2s_dai_ops,
 286 };
 287 
 288 static const struct snd_soc_component_driver au1xpsc_i2s_component = {
 289         .name           = "au1xpsc-i2s",
 290 };
 291 
 292 static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 293 {
 294         struct resource *dmares;
 295         unsigned long sel;
 296         struct au1xpsc_audio_data *wd;
 297 
 298         wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
 299                           GFP_KERNEL);
 300         if (!wd)
 301                 return -ENOMEM;
 302 
 303         wd->mmio = devm_platform_ioremap_resource(pdev, 0);
 304         if (IS_ERR(wd->mmio))
 305                 return PTR_ERR(wd->mmio);
 306 
 307         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 308         if (!dmares)
 309                 return -EBUSY;
 310         wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 311 
 312         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 313         if (!dmares)
 314                 return -EBUSY;
 315         wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 316 
 317         /* preserve PSC clock source set up by platform (dev.platform_data
 318          * is already occupied by soc layer)
 319          */
 320         sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 321         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 322         wmb(); /* drain writebuffer */
 323         __raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
 324         __raw_writel(0, I2S_CFG(wd));
 325         wmb(); /* drain writebuffer */
 326 
 327         /* preconfigure: set max rx/tx fifo depths */
 328         wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 329 
 330         /* don't wait for I2S core to become ready now; clocks may not
 331          * be running yet; depending on clock input for PSC a wait might
 332          * time out.
 333          */
 334 
 335         /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */
 336         memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template,
 337                sizeof(struct snd_soc_dai_driver));
 338         wd->dai_drv.name = dev_name(&pdev->dev);
 339 
 340         platform_set_drvdata(pdev, wd);
 341 
 342         return devm_snd_soc_register_component(&pdev->dev,
 343                                 &au1xpsc_i2s_component, &wd->dai_drv, 1);
 344 }
 345 
 346 static int au1xpsc_i2s_drvremove(struct platform_device *pdev)
 347 {
 348         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 349 
 350         __raw_writel(0, I2S_CFG(wd));
 351         wmb(); /* drain writebuffer */
 352         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 353         wmb(); /* drain writebuffer */
 354 
 355         return 0;
 356 }
 357 
 358 #ifdef CONFIG_PM
 359 static int au1xpsc_i2s_drvsuspend(struct device *dev)
 360 {
 361         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 362 
 363         /* save interesting register and disable PSC */
 364         wd->pm[0] = __raw_readl(PSC_SEL(wd));
 365 
 366         __raw_writel(0, I2S_CFG(wd));
 367         wmb(); /* drain writebuffer */
 368         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 369         wmb(); /* drain writebuffer */
 370 
 371         return 0;
 372 }
 373 
 374 static int au1xpsc_i2s_drvresume(struct device *dev)
 375 {
 376         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 377 
 378         /* select I2S mode and PSC clock */
 379         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 380         wmb(); /* drain writebuffer */
 381         __raw_writel(0, PSC_SEL(wd));
 382         wmb(); /* drain writebuffer */
 383         __raw_writel(wd->pm[0], PSC_SEL(wd));
 384         wmb(); /* drain writebuffer */
 385 
 386         return 0;
 387 }
 388 
 389 static const struct dev_pm_ops au1xpsci2s_pmops = {
 390         .suspend        = au1xpsc_i2s_drvsuspend,
 391         .resume         = au1xpsc_i2s_drvresume,
 392 };
 393 
 394 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
 395 
 396 #else
 397 
 398 #define AU1XPSCI2S_PMOPS NULL
 399 
 400 #endif
 401 
 402 static struct platform_driver au1xpsc_i2s_driver = {
 403         .driver         = {
 404                 .name   = "au1xpsc_i2s",
 405                 .pm     = AU1XPSCI2S_PMOPS,
 406         },
 407         .probe          = au1xpsc_i2s_drvprobe,
 408         .remove         = au1xpsc_i2s_drvremove,
 409 };
 410 
 411 module_platform_driver(au1xpsc_i2s_driver);
 412 
 413 MODULE_LICENSE("GPL");
 414 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
 415 MODULE_AUTHOR("Manuel Lauss");