sound/soc/au1x/psc-ac97.c

   1 /*
   2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   3  *
   4  * (c) 2007-2009 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 AC97 glue.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19 #include <linux/delay.h>
  20 #include <linux/mutex.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 /* how often to retry failed codec register reads/writes */
  32 #define AC97_RW_RETRIES 5
  33
  34 #define AC97_DIR        \
  35         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  36
  37 #define AC97_RATES      \
  38         SNDRV_PCM_RATE_8000_48000
  39
  40 #define AC97_FMTS       \
  41         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
  42
  43 #define AC97PCR_START(stype)    \
  44         ((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
  45 #define AC97PCR_STOP(stype)     \
  46         ((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
  47 #define AC97PCR_CLRFIFO(stype)  \
  48         ((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
  49
  50 #define AC97STAT_BUSY(stype)    \
  51         ((stype) == PCM_TX ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
  52
  53 /* instance data. There can be only one, MacLeod!!!! */
  54 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
  55
  56 #if 0
  57
  58 /* this could theoretically work, but ac97->bus->card->private_data can be NULL
  59  * when snd_ac97_mixer() is called; I don't know if the rest further down the
  60  * chain are always valid either.
  61  */
  62 static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
  63 {
  64         struct snd_soc_card *c = x->bus->card->private_data;
  65         return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
  66 }
  67
  68 #else
  69
  70 #define ac97_to_pscdata(x)      au1xpsc_ac97_workdata
  71
  72 #endif
  73
  74 /* AC97 controller reads codec register */
  75 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
  76                                         unsigned short reg)
  77 {
  78         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
  79         unsigned short retry, tmo;
  80         unsigned long data;
  81
  82         au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
  83         au_sync();
  84
  85         retry = AC97_RW_RETRIES;
  86         do {
  87                 mutex_lock(&pscdata->lock);
  88
  89                 au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
  90                           AC97_CDC(pscdata));
  91                 au_sync();
  92
  93                 tmo = 20;
  94                 do {
  95                         udelay(21);
  96                         if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
  97                                 break;
  98                 } while (--tmo);
  99
 100                 data = au_readl(AC97_CDC(pscdata));
 101
 102                 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 103                 au_sync();
 104
 105                 mutex_unlock(&pscdata->lock);
 106
 107                 if (reg != ((data >> 16) & 0x7f))
 108                         tmo = 1;        /* wrong register, try again */
 109
 110         } while (--retry && !tmo);
 111
 112         return retry ? data & 0xffff : 0xffff;
 113 }
 114
 115 /* AC97 controller writes to codec register */
 116 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 117                                 unsigned short val)
 118 {
 119         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 120         unsigned int tmo, retry;
 121
 122         au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 123         au_sync();
 124
 125         retry = AC97_RW_RETRIES;
 126         do {
 127                 mutex_lock(&pscdata->lock);
 128
 129                 au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
 130                           AC97_CDC(pscdata));
 131                 au_sync();
 132
 133                 tmo = 20;
 134                 do {
 135                         udelay(21);
 136                         if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
 137                                 break;
 138                 } while (--tmo);
 139
 140                 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 141                 au_sync();
 142
 143                 mutex_unlock(&pscdata->lock);
 144         } while (--retry && !tmo);
 145 }
 146
 147 /* AC97 controller asserts a warm reset */
 148 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
 149 {
 150         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 151
 152         au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
 153         au_sync();
 154         msleep(10);
 155         au_writel(0, AC97_RST(pscdata));
 156         au_sync();
 157 }
 158
 159 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
 160 {
 161         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 162         int i;
 163
 164         /* disable PSC during cold reset */
 165         au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
 166         au_sync();
 167         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
 168         au_sync();
 169
 170         /* issue cold reset */
 171         au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
 172         au_sync();
 173         msleep(500);
 174         au_writel(0, AC97_RST(pscdata));
 175         au_sync();
 176
 177         /* enable PSC */
 178         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 179         au_sync();
 180
 181         /* wait for PSC to indicate it's ready */
 182         i = 1000;
 183         while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
 184                 msleep(1);
 185
 186         if (i == 0) {
 187                 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
 188                 return;
 189         }
 190
 191         /* enable the ac97 function */
 192         au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 193         au_sync();
 194
 195         /* wait for AC97 core to become ready */
 196         i = 1000;
 197         while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
 198                 msleep(1);
 199         if (i == 0)
 200                 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
 201 }
 202
 203 /* AC97 controller operations */
 204 struct snd_ac97_bus_ops soc_ac97_ops = {
 205         .read           = au1xpsc_ac97_read,
 206         .write          = au1xpsc_ac97_write,
 207         .reset          = au1xpsc_ac97_cold_reset,
 208         .warm_reset     = au1xpsc_ac97_warm_reset,
 209 };
 210 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 211
 212 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
 213                                   struct snd_pcm_hw_params *params,
 214                                   struct snd_soc_dai *dai)
 215 {
 216         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 217         unsigned long r, ro, stat;
 218         int chans, t, stype = SUBSTREAM_TYPE(substream);
 219
 220         chans = params_channels(params);
 221
 222         r = ro = au_readl(AC97_CFG(pscdata));
 223         stat = au_readl(AC97_STAT(pscdata));
 224
 225         /* already active? */
 226         if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
 227                 /* reject parameters not currently set up */
 228                 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
 229                     (pscdata->rate != params_rate(params)))
 230                         return -EINVAL;
 231         } else {
 232
 233                 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
 234                 r &= ~PSC_AC97CFG_LEN_MASK;
 235                 r |= PSC_AC97CFG_SET_LEN(params->msbits);
 236
 237                 /* channels: enable slots for front L/R channel */
 238                 if (stype == PCM_TX) {
 239                         r &= ~PSC_AC97CFG_TXSLOT_MASK;
 240                         r |= PSC_AC97CFG_TXSLOT_ENA(3);
 241                         r |= PSC_AC97CFG_TXSLOT_ENA(4);
 242                 } else {
 243                         r &= ~PSC_AC97CFG_RXSLOT_MASK;
 244                         r |= PSC_AC97CFG_RXSLOT_ENA(3);
 245                         r |= PSC_AC97CFG_RXSLOT_ENA(4);
 246                 }
 247
 248                 /* do we need to poke the hardware? */
 249                 if (!(r ^ ro))
 250                         goto out;
 251
 252                 /* ac97 engine is about to be disabled */
 253                 mutex_lock(&pscdata->lock);
 254
 255                 /* disable AC97 device controller first... */
 256                 au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 257                 au_sync();
 258
 259                 /* ...wait for it... */
 260                 t = 100;
 261                 while ((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
 262                         msleep(1);
 263
 264                 if (!t)
 265                         printk(KERN_ERR "PSC-AC97: can't disable!\n");
 266
 267                 /* ...write config... */
 268                 au_writel(r, AC97_CFG(pscdata));
 269                 au_sync();
 270
 271                 /* ...enable the AC97 controller again... */
 272                 au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 273                 au_sync();
 274
 275                 /* ...and wait for ready bit */
 276                 t = 100;
 277                 while ((!(au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
 278                         msleep(1);
 279
 280                 if (!t)
 281                         printk(KERN_ERR "PSC-AC97: can't enable!\n");
 282
 283                 mutex_unlock(&pscdata->lock);
 284
 285                 pscdata->cfg = r;
 286                 pscdata->rate = params_rate(params);
 287         }
 288
 289 out:
 290         return 0;
 291 }
 292
 293 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
 294                                 int cmd, struct snd_soc_dai *dai)
 295 {
 296         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
 297         int ret, stype = SUBSTREAM_TYPE(substream);
 298
 299         ret = 0;
 300
 301         switch (cmd) {
 302         case SNDRV_PCM_TRIGGER_START:
 303         case SNDRV_PCM_TRIGGER_RESUME:
 304                 au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
 305                 au_sync();
 306                 au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
 307                 au_sync();
 308                 break;
 309         case SNDRV_PCM_TRIGGER_STOP:
 310         case SNDRV_PCM_TRIGGER_SUSPEND:
 311                 au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
 312                 au_sync();
 313
 314                 while (au_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
 315                         asm volatile ("nop");
 316
 317                 au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
 318                 au_sync();
 319
 320                 break;
 321         default:
 322                 ret = -EINVAL;
 323         }
 324         return ret;
 325 }
 326
 327 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
 328 {
 329         return au1xpsc_ac97_workdata ? 0 : -ENODEV;
 330 }
 331
 332 static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
 333         .trigger        = au1xpsc_ac97_trigger,
 334         .hw_params      = au1xpsc_ac97_hw_params,
 335 };
 336
 337 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
 338         .ac97_control           = 1,
 339         .probe                  = au1xpsc_ac97_probe,
 340         .playback = {
 341                 .rates          = AC97_RATES,
 342                 .formats        = AC97_FMTS,
 343                 .channels_min   = 2,
 344                 .channels_max   = 2,
 345         },
 346         .capture = {
 347                 .rates          = AC97_RATES,
 348                 .formats        = AC97_FMTS,
 349                 .channels_min   = 2,
 350                 .channels_max   = 2,
 351         },
 352         .ops = &au1xpsc_ac97_dai_ops,
 353 };
 354
 355 static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 356 {
 357         int ret;
 358         struct resource *r;
 359         unsigned long sel;
 360         struct au1xpsc_audio_data *wd;
 361
 362         wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 363         if (!wd)
 364                 return -ENOMEM;
 365
 366         mutex_init(&wd->lock);
 367
 368         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 369         if (!r) {
 370                 ret = -ENODEV;
 371                 goto out0;
 372         }
 373
 374         ret = -EBUSY;
 375         if (!request_mem_region(r->start, resource_size(r), pdev->name))
 376                 goto out0;
 377
 378         wd->mmio = ioremap(r->start, resource_size(r));
 379         if (!wd->mmio)
 380                 goto out1;
 381
 382         /* configuration: max dma trigger threshold, enable ac97 */
 383         wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
 384                   PSC_AC97CFG_DE_ENABLE;
 385
 386         /* preserve PSC clock source set up by platform  */
 387         sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
 388         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 389         au_sync();
 390         au_writel(0, PSC_SEL(wd));
 391         au_sync();
 392         au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
 393         au_sync();
 394
 395         /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
 396         memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
 397                sizeof(struct snd_soc_dai_driver));
 398         wd->dai_drv.name = dev_name(&pdev->dev);
 399
 400         platform_set_drvdata(pdev, wd);
 401
 402         ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
 403         if (ret)
 404                 goto out1;
 405
 406         wd->dmapd = au1xpsc_pcm_add(pdev);
 407         if (wd->dmapd) {
 408                 au1xpsc_ac97_workdata = wd;
 409                 return 0;
 410         }
 411
 412         snd_soc_unregister_dai(&pdev->dev);
 413 out1:
 414         release_mem_region(r->start, resource_size(r));
 415 out0:
 416         kfree(wd);
 417         return ret;
 418 }
 419
 420 static int __devexit au1xpsc_ac97_drvremove(struct platform_device *pdev)
 421 {
 422         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
 423         struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 424
 425         if (wd->dmapd)
 426                 au1xpsc_pcm_destroy(wd->dmapd);
 427
 428         snd_soc_unregister_dai(&pdev->dev);
 429
 430         /* disable PSC completely */
 431         au_writel(0, AC97_CFG(wd));
 432         au_sync();
 433         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 434         au_sync();
 435
 436         iounmap(wd->mmio);
 437         release_mem_region(r->start, resource_size(r));
 438         kfree(wd);
 439
 440         au1xpsc_ac97_workdata = NULL;   /* MDEV */
 441
 442         return 0;
 443 }
 444
 445 #ifdef CONFIG_PM
 446 static int au1xpsc_ac97_drvsuspend(struct device *dev)
 447 {
 448         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 449
 450         /* save interesting registers and disable PSC */
 451         wd->pm[0] = au_readl(PSC_SEL(wd));
 452
 453         au_writel(0, AC97_CFG(wd));
 454         au_sync();
 455         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
 456         au_sync();
 457
 458         return 0;
 459 }
 460
 461 static int au1xpsc_ac97_drvresume(struct device *dev)
 462 {
 463         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
 464
 465         /* restore PSC clock config */
 466         au_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
 467         au_sync();
 468
 469         /* after this point the ac97 core will cold-reset the codec.
 470          * During cold-reset the PSC is reinitialized and the last
 471          * configuration set up in hw_params() is restored.
 472          */
 473         return 0;
 474 }
 475
 476 static struct dev_pm_ops au1xpscac97_pmops = {
 477         .suspend        = au1xpsc_ac97_drvsuspend,
 478         .resume         = au1xpsc_ac97_drvresume,
 479 };
 480
 481 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
 482
 483 #else
 484
 485 #define AU1XPSCAC97_PMOPS NULL
 486
 487 #endif
 488
 489 static struct platform_driver au1xpsc_ac97_driver = {
 490         .driver = {
 491                 .name   = "au1xpsc_ac97",
 492                 .owner  = THIS_MODULE,
 493                 .pm     = AU1XPSCAC97_PMOPS,
 494         },
 495         .probe          = au1xpsc_ac97_drvprobe,
 496         .remove         = __devexit_p(au1xpsc_ac97_drvremove),
 497 };
 498
 499 static int __init au1xpsc_ac97_load(void)
 500 {
 501         au1xpsc_ac97_workdata = NULL;
 502         return platform_driver_register(&au1xpsc_ac97_driver);
 503 }
 504
 505 static void __exit au1xpsc_ac97_unload(void)
 506 {
 507         platform_driver_unregister(&au1xpsc_ac97_driver);
 508 }
 509
 510 module_init(au1xpsc_ac97_load);
 511 module_exit(au1xpsc_ac97_unload);
 512
 513 MODULE_LICENSE("GPL");
 514 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
 515 MODULE_AUTHOR("Manuel Lauss");
 516