LXR linux/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) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
  46#define I2SPCR_START(stype)     \
  47        ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
  48#define I2SPCR_STOP(stype)      \
  49        ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
  50#define I2SPCR_CLRFIFO(stype)   \
  51        ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
  52
  53
  54static 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;
 109out:
 110        return ret;
 111}
 112
 113static 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 = __raw_readl(I2S_STAT(pscdata));
 124        if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
 125                /* reject parameters not currently set up in hardware */
 126                cfgbits = __raw_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 */
 147static 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        __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 153        wmb(); /* drain writebuffer */
 154
 155        tmo = 1000000;
 156        while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
 157                tmo--;
 158
 159        if (!tmo)
 160                goto psc_err;
 161
 162        __raw_writel(0, I2S_CFG(pscdata));
 163        wmb(); /* drain writebuffer */
 164        __raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
 165        wmb(); /* drain writebuffer */
 166
 167        /* wait for I2S controller to become ready */
 168        tmo = 1000000;
 169        while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
 170                tmo--;
 171
 172        if (tmo)
 173                return 0;
 174
 175psc_err:
 176        __raw_writel(0, I2S_CFG(pscdata));
 177        __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 178        wmb(); /* drain writebuffer */
 179        return -ETIMEDOUT;
 180}
 181
 182static 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 = __raw_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        __raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
 198        wmb(); /* drain writebuffer */
 199        __raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
 200        wmb(); /* drain writebuffer */
 201
 202        /* wait for start confirmation */
 203        tmo = 1000000;
 204        while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 205                tmo--;
 206
 207        if (!tmo) {
 208                __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 209                wmb(); /* drain writebuffer */
 210                ret = -ETIMEDOUT;
 211        }
 212out:
 213        return ret;
 214}
 215
 216static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
 217{
 218        unsigned long tmo, stat;
 219
 220        __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
 221        wmb(); /* drain writebuffer */
 222
 223        /* wait for stop confirmation */
 224        tmo = 1000000;
 225        while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
 226                tmo--;
 227
 228        /* if both TX and RX are idle, disable PSC */
 229        stat = __raw_readl(I2S_STAT(pscdata));
 230        if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
 231                __raw_writel(0, I2S_CFG(pscdata));
 232                wmb(); /* drain writebuffer */
 233                __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
 234                wmb(); /* drain writebuffer */
 235        }
 236        return 0;
 237}
 238
 239static 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->stream;
 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
 260static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream,
 261                               struct snd_soc_dai *dai)
 262{
 263        struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 264        snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
 265        return 0;
 266}
 267
 268static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
 269        .startup        = au1xpsc_i2s_startup,
 270        .trigger        = au1xpsc_i2s_trigger,
 271        .hw_params      = au1xpsc_i2s_hw_params,
 272        .set_fmt        = au1xpsc_i2s_set_fmt,
 273};
 274
 275static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = {
 276        .playback = {
 277                .rates          = AU1XPSC_I2S_RATES,
 278                .formats        = AU1XPSC_I2S_FMTS,
 279                .channels_min   = 2,
 280                .channels_max   = 8,    /* 2 without external help */
 281        },
 282        .capture = {
 283                .rates          = AU1XPSC_I2S_RATES,
 284                .formats        = AU1XPSC_I2S_FMTS,
 285                .channels_min   = 2,
 286                .channels_max   = 8,    /* 2 without external help */
 287        },
 288        .ops = &au1xpsc_i2s_dai_ops,
 289};
 290
 291static const struct snd_soc_component_driver au1xpsc_i2s_component = {
 292        .name           = "au1xpsc-i2s",
 293};
 294
 295static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 296{
 297        struct resource *iores, *dmares;
 298        unsigned long sel;
 299        struct au1xpsc_audio_data *wd;
 300
 301        wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
 302                          GFP_KERNEL);
 303        if (!wd)
 304                return -ENOMEM;
 305
 306        iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 307        wd->mmio = devm_ioremap_resource(&pdev->dev, iores);
 308        if (IS_ERR(wd->mmio))
 309                return PTR_ERR(wd->mmio);
 310
 311        dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 312        if (!dmares)
 313                return -EBUSY;
 314        wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 315
 316        dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 317        if (!dmares)
 318                return -EBUSY;
 319        wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 320
 321        /* preserve PSC clock source set up by platform (dev.platform_data
 322         * is already occupied by soc layer)
 323         */
 324        sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 325        __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 326        wmb(); /* drain writebuffer */
 327        __raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
 328        __raw_writel(0, I2S_CFG(wd));
 329        wmb(); /* drain writebuffer */
 330
 331        /* preconfigure: set max rx/tx fifo depths */
 332        wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
 333
 334        /* don't wait for I2S core to become ready now; clocks may not
 335         * be running yet; depending on clock input for PSC a wait might
 336         * time out.
 337         */
 338
 339        /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */
 340        memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template,
 341               sizeof(struct snd_soc_dai_driver));
 342        wd->dai_drv.name = dev_name(&pdev->dev);
 343
 344        platform_set_drvdata(pdev, wd);
 345
 346        return snd_soc_register_component(&pdev->dev, &au1xpsc_i2s_component,
 347                                          &wd->dai_drv, 1);
 348}
 349
 350static int au1xpsc_i2s_drvremove(struct platform_device *pdev)
 351{
 352        struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 353
 354        snd_soc_unregister_component(&pdev->dev);
 355
 356        __raw_writel(0, I2S_CFG(wd));
 357        wmb(); /* drain writebuffer */
 358        __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 359        wmb(); /* drain writebuffer */
 360
 361        return 0;
 362}
 363
 364#ifdef CONFIG_PM
 365static int au1xpsc_i2s_drvsuspend(struct device *dev)
 366{
 367        struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 368
 369        /* save interesting register and disable PSC */
 370        wd->pm[0] = __raw_readl(PSC_SEL(wd));
 371
 372        __raw_writel(0, I2S_CFG(wd));
 373        wmb(); /* drain writebuffer */
 374        __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 375        wmb(); /* drain writebuffer */
 376
 377        return 0;
 378}
 379
 380static int au1xpsc_i2s_drvresume(struct device *dev)
 381{
 382        struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 383
 384        /* select I2S mode and PSC clock */
 385        __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 386        wmb(); /* drain writebuffer */
 387        __raw_writel(0, PSC_SEL(wd));
 388        wmb(); /* drain writebuffer */
 389        __raw_writel(wd->pm[0], PSC_SEL(wd));
 390        wmb(); /* drain writebuffer */
 391
 392        return 0;
 393}
 394
 395static struct dev_pm_ops au1xpsci2s_pmops = {
 396        .suspend        = au1xpsc_i2s_drvsuspend,
 397        .resume         = au1xpsc_i2s_drvresume,
 398};
 399
 400#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
 401
 402#else
 403
 404#define AU1XPSCI2S_PMOPS NULL
 405
 406#endif
 407
 408static struct platform_driver au1xpsc_i2s_driver = {
 409        .driver         = {
 410                .name   = "au1xpsc_i2s",
 411                .pm     = AU1XPSCI2S_PMOPS,
 412        },
 413        .probe          = au1xpsc_i2s_drvprobe,
 414        .remove         = au1xpsc_i2s_drvremove,
 415};
 416
 417module_platform_driver(au1xpsc_i2s_driver);
 418
 419MODULE_LICENSE("GPL");
 420MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
 421MODULE_AUTHOR("Manuel Lauss");
 422