sound/soc/au1x/psc-ac97.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   4  *
   5  * (c) 2007-2009 MSC Vertriebsges.m.b.H.,
   6  *      Manuel Lauss <manuel.lauss@gmail.com>
   7  *
   8  * Au1xxx-PSC AC97 glue.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/device.h>
  15 #include <linux/delay.h>
  16 #include <linux/mutex.h>
  17 #include <linux/suspend.h>
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/initval.h>
  21 #include <sound/soc.h>
  22 #include <asm/mach-au1x00/au1000.h>
  23 #include <asm/mach-au1x00/au1xxx_psc.h>
  24
  25 #include "psc.h"
  26
  27 /* how often to retry failed codec register reads/writes */
  28 #define AC97_RW_RETRIES 5
  29
  30 #define AC97_DIR        \
  31         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  32
  33 #define AC97_RATES      \
  34         SNDRV_PCM_RATE_8000_48000
  35
  36 #define AC97_FMTS       \
  37         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
  38
  39 #define AC97PCR_START(stype)    \
  40         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
  41 #define AC97PCR_STOP(stype)     \
  42         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
  43 #define AC97PCR_CLRFIFO(stype)  \
  44         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
  45
  46 #define AC97STAT_BUSY(stype)    \
  47         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
  48
  49 /* instance data. There can be only one, MacLeod!!!! */
  50 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
  51
  52 #if 0
  53
  54 /* this could theoretically work, but ac97->bus->card->private_data can be NULL
  55  * when snd_ac97_mixer() is called; I don't know if the rest further down the
  56  * chain are always valid either.
  57  */
  58 static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
  59 {
  60         struct snd_soc_card *c = x->bus->card->private_data;
  61         return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
  62 }
  63
  64 #else
  65
  66 #define ac97_to_pscdata(x)      au1xpsc_ac97_workdata
  67
  68 #endif
  69
  70 /* AC97 controller reads codec register */
  71 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
  72                                         unsigned short reg)
  73 {
  74         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
  75         unsigned short retry, tmo;
  76         unsigned long data;
  77
  78         __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
  79         wmb(); /* drain writebuffer */
  80
  81         retry = AC97_RW_RETRIES;
  82         do {
  83                 mutex_lock(&pscdata->lock);
  84
  85                 __raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
  86                           AC97_CDC(pscdata));
  87                 wmb(); /* drain writebuffer */
  88
  89                 tmo = 20;
  90                 do {
  91                         udelay(21);
  92                         if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
  93                                 break;
  94                 } while (--tmo);
  95
  96                 data = __raw_readl(AC97_CDC(pscdata));
  97
  98                 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
  99                 wmb(); /* drain writebuffer */
 100
 101                 mutex_unlock(&pscdata->lock);
 102
 103                 if (reg != ((data >> 16) & 0x7f))
 104                         tmo = 1;        /* wrong register, try again */
 105
 106         } while (--retry && !tmo);
 107
 108         return retry ? data & 0xffff : 0xffff;
 109 }
 110
 111 /* AC97 controller writes to codec register */
 112 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 113                                 unsigned short val)
 114 {
 115         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 116         unsigned int tmo, retry;
 117
 118         __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 119         wmb(); /* drain writebuffer */
 120
 121         retry = AC97_RW_RETRIES;
 122         do {
 123                 mutex_lock(&pscdata->lock);
 124
 125                 __raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
 126                           AC97_CDC(pscdata));
 127                 wmb(); /* drain writebuffer */
 128
 129                 tmo = 20;
 130                 do {
 131                         udelay(21);
 132                         if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
 133                                 break;
 134                 } while (--tmo);
 135
 136                 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 137                 wmb(); /* drain writebuffer */
 138
 139                 mutex_unlock(&pscdata->lock);
 140         } while (--retry && !tmo);
 141 }
 142
 143 /* AC97 controller asserts a warm reset */
 144 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
 145 {
 146         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 147
 148         __raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
 149         wmb(); /* drain writebuffer */
 150         msleep(10);
 151         __raw_writel(0, AC97_RST(pscdata));
 152         wmb(); /* drain writebuffer */
 153 }
 154
 155 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
 156 {
 157         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 158         int i;
 159
 160         /* disable PSC during cold reset */
 161         __raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
 162         wmb(); /* drain writebuffer */
 163         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
 164         wmb(); /* drain writebuffer */
 165
 166         /* issue cold reset */
 167         __raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
 168         wmb(); /* drain writebuffer */
 169         msleep(500);
 170         __raw_writel(0, AC97_RST(pscdata));
 171         wmb(); /* drain writebuffer */
 172
 173         /* enable PSC */
 174         __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 175         wmb(); /* drain writebuffer */
 176
 177         /* wait for PSC to indicate it's ready */
 178         i = 1000;
 179         while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
 180                 msleep(1);
 181
 182         if (i == 0) {
 183                 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
 184                 return;
 185         }
 186
 187         /* enable the ac97 function */
 188         __raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 189         wmb(); /* drain writebuffer */
 190
 191         /* wait for AC97 core to become ready */
 192         i = 1000;
 193         while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
 194                 msleep(1);
 195         if (i == 0)
 196                 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
 197 }
 198
 199 /* AC97 controller operations */
 200 static struct snd_ac97_bus_ops psc_ac97_ops = {
 201         .read           = au1xpsc_ac97_read,
 202         .write          = au1xpsc_ac97_write,
 203         .reset          = au1xpsc_ac97_cold_reset,
 204         .warm_reset     = au1xpsc_ac97_warm_reset,
 205 };
 206
 207 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
 208                                   struct snd_pcm_hw_params *params,
 209                                   struct snd_soc_dai *dai)
 210 {
 211         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 212         unsigned long r, ro, stat;
 213         int chans, t, stype = substream->stream;
 214
 215         chans = params_channels(params);
 216
 217         r = ro = __raw_readl(AC97_CFG(pscdata));
 218         stat = __raw_readl(AC97_STAT(pscdata));
 219
 220         /* already active? */
 221         if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
 222                 /* reject parameters not currently set up */
 223                 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
 224                     (pscdata->rate != params_rate(params)))
 225                         return -EINVAL;
 226         } else {
 227
 228                 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
 229                 r &= ~PSC_AC97CFG_LEN_MASK;
 230                 r |= PSC_AC97CFG_SET_LEN(params->msbits);
 231
 232                 /* channels: enable slots for front L/R channel */
 233                 if (stype == SNDRV_PCM_STREAM_PLAYBACK) {
 234                         r &= ~PSC_AC97CFG_TXSLOT_MASK;
 235                         r |= PSC_AC97CFG_TXSLOT_ENA(3);
 236                         r |= PSC_AC97CFG_TXSLOT_ENA(4);
 237                 } else {
 238                         r &= ~PSC_AC97CFG_RXSLOT_MASK;
 239                         r |= PSC_AC97CFG_RXSLOT_ENA(3);
 240                         r |= PSC_AC97CFG_RXSLOT_ENA(4);
 241                 }
 242
 243                 /* do we need to poke the hardware? */
 244                 if (!(r ^ ro))
 245                         goto out;
 246
 247                 /* ac97 engine is about to be disabled */
 248                 mutex_lock(&pscdata->lock);
 249
 250                 /* disable AC97 device controller first... */
 251                 __raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 252                 wmb(); /* drain writebuffer */
 253
 254                 /* ...wait for it... */
 255                 t = 100;
 256                 while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
 257                         msleep(1);
 258
 259                 if (!t)
 260                         printk(KERN_ERR "PSC-AC97: can't disable!\n");
 261
 262                 /* ...write config... */
 263                 __raw_writel(r, AC97_CFG(pscdata));
 264                 wmb(); /* drain writebuffer */
 265
 266                 /* ...enable the AC97 controller again... */
 267                 __raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 268                 wmb(); /* drain writebuffer */
 269
 270                 /* ...and wait for ready bit */
 271                 t = 100;
 272                 while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
 273                         msleep(1);
 274
 275                 if (!t)
 276                         printk(KERN_ERR "PSC-AC97: can't enable!\n");
 277
 278                 mutex_unlock(&pscdata->lock);
 279
 280                 pscdata->cfg = r;
 281                 pscdata->rate = params_rate(params);
 282         }
 283
 284 out:
 285         return 0;
 286 }
 287
 288 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
 289                                 int cmd, struct snd_soc_dai *dai)
 290 {
 291         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 292         int ret, stype = substream->stream;
 293
 294         ret = 0;
 295
 296         switch (cmd) {
 297         case SNDRV_PCM_TRIGGER_START:
 298         case SNDRV_PCM_TRIGGER_RESUME:
 299                 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
 300                 wmb(); /* drain writebuffer */
 301                 __raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
 302                 wmb(); /* drain writebuffer */
 303                 break;
 304         case SNDRV_PCM_TRIGGER_STOP:
 305         case SNDRV_PCM_TRIGGER_SUSPEND:
 306                 __raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
 307                 wmb(); /* drain writebuffer */
 308
 309                 while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
 310                         asm volatile ("nop");
 311
 312                 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
 313                 wmb(); /* drain writebuffer */
 314
 315                 break;
 316         default:
 317                 ret = -EINVAL;
 318         }
 319         return ret;
 320 }
 321
 322 static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream,
 323                                 struct snd_soc_dai *dai)
 324 {
 325         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 326         snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
 327         return 0;
 328 }
 329
 330 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
 331 {
 332         return au1xpsc_ac97_workdata ? 0 : -ENODEV;
 333 }
 334
 335 static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
 336         .startup        = au1xpsc_ac97_startup,
 337         .trigger        = au1xpsc_ac97_trigger,
 338         .hw_params      = au1xpsc_ac97_hw_params,
 339 };
 340
 341 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
 342         .probe                  = au1xpsc_ac97_probe,
 343         .playback = {
 344                 .rates          = AC97_RATES,
 345                 .formats        = AC97_FMTS,
 346                 .channels_min   = 2,
 347                 .channels_max   = 2,
 348         },
 349         .capture = {
 350                 .rates          = AC97_RATES,
 351                 .formats        = AC97_FMTS,
 352                 .channels_min   = 2,
 353                 .channels_max   = 2,
 354         },
 355         .ops = &au1xpsc_ac97_dai_ops,
 356 };
 357
 358 static const struct snd_soc_component_driver au1xpsc_ac97_component = {
 359         .name           = "au1xpsc-ac97",
 360 };
 361
 362 static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 363 {
 364         int ret;
 365         struct resource *dmares;
 366         unsigned long sel;
 367         struct au1xpsc_audio_data *wd;
 368
 369         wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
 370                           GFP_KERNEL);
 371         if (!wd)
 372                 return -ENOMEM;
 373
 374         mutex_init(&wd->lock);
 375
 376         wd->mmio = devm_platform_ioremap_resource(pdev, 0);
 377         if (IS_ERR(wd->mmio))
 378                 return PTR_ERR(wd->mmio);
 379
 380         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 381         if (!dmares)
 382                 return -EBUSY;
 383         wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 384
 385         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 386         if (!dmares)
 387                 return -EBUSY;
 388         wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 389
 390         /* configuration: max dma trigger threshold, enable ac97 */
 391         wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
 392                   PSC_AC97CFG_DE_ENABLE;
 393
 394         /* preserve PSC clock source set up by platform  */
 395         sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 396         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 397         wmb(); /* drain writebuffer */
 398         __raw_writel(0, PSC_SEL(wd));
 399         wmb(); /* drain writebuffer */
 400         __raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
 401         wmb(); /* drain writebuffer */
 402
 403         /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
 404         memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
 405                sizeof(struct snd_soc_dai_driver));
 406         wd->dai_drv.name = dev_name(&pdev->dev);
 407
 408         platform_set_drvdata(pdev, wd);
 409
 410         ret = snd_soc_set_ac97_ops(&psc_ac97_ops);
 411         if (ret)
 412                 return ret;
 413
 414         ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component,
 415                                          &wd->dai_drv, 1);
 416         if (ret)
 417                 return ret;
 418
 419         au1xpsc_ac97_workdata = wd;
 420         return 0;
 421 }
 422
 423 static int au1xpsc_ac97_drvremove(struct platform_device *pdev)
 424 {
 425         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 426
 427         snd_soc_unregister_component(&pdev->dev);
 428
 429         /* disable PSC completely */
 430         __raw_writel(0, AC97_CFG(wd));
 431         wmb(); /* drain writebuffer */
 432         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 433         wmb(); /* drain writebuffer */
 434
 435         au1xpsc_ac97_workdata = NULL;   /* MDEV */
 436
 437         return 0;
 438 }
 439
 440 #ifdef CONFIG_PM
 441 static int au1xpsc_ac97_drvsuspend(struct device *dev)
 442 {
 443         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 444
 445         /* save interesting registers and disable PSC */
 446         wd->pm[0] = __raw_readl(PSC_SEL(wd));
 447
 448         __raw_writel(0, AC97_CFG(wd));
 449         wmb(); /* drain writebuffer */
 450         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 451         wmb(); /* drain writebuffer */
 452
 453         return 0;
 454 }
 455
 456 static int au1xpsc_ac97_drvresume(struct device *dev)
 457 {
 458         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 459
 460         /* restore PSC clock config */
 461         __raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
 462         wmb(); /* drain writebuffer */
 463
 464         /* after this point the ac97 core will cold-reset the codec.
 465          * During cold-reset the PSC is reinitialized and the last
 466          * configuration set up in hw_params() is restored.
 467          */
 468         return 0;
 469 }
 470
 471 static const struct dev_pm_ops au1xpscac97_pmops = {
 472         .suspend        = au1xpsc_ac97_drvsuspend,
 473         .resume         = au1xpsc_ac97_drvresume,
 474 };
 475
 476 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
 477
 478 #else
 479
 480 #define AU1XPSCAC97_PMOPS NULL
 481
 482 #endif
 483
 484 static struct platform_driver au1xpsc_ac97_driver = {
 485         .driver = {
 486                 .name   = "au1xpsc_ac97",
 487                 .pm     = AU1XPSCAC97_PMOPS,
 488         },
 489         .probe          = au1xpsc_ac97_drvprobe,
 490         .remove         = au1xpsc_ac97_drvremove,
 491 };
 492
 493 module_platform_driver(au1xpsc_ac97_driver);
 494
 495 MODULE_LICENSE("GPL");
 496 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
 497 MODULE_AUTHOR("Manuel Lauss");
 498