sound/soc/au1x/psc-ac97.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 AC97 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  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/device.h>
  21 #include <linux/delay.h>
  22 #include <linux/suspend.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/initval.h>
  26 #include <sound/soc.h>
  27 #include <asm/mach-au1x00/au1000.h>
  28 #include <asm/mach-au1x00/au1xxx_psc.h>
  29
  30 #include "psc.h"
  31
  32 #define AC97_DIR        \
  33         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  34
  35 #define AC97_RATES      \
  36         SNDRV_PCM_RATE_8000_48000
  37
  38 #define AC97_FMTS       \
  39         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
  40
  41 #define AC97PCR_START(stype)    \
  42         ((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
  43 #define AC97PCR_STOP(stype)     \
  44         ((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
  45 #define AC97PCR_CLRFIFO(stype)  \
  46         ((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
  47
  48 /* instance data. There can be only one, MacLeod!!!! */
  49 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
  50
  51 /* AC97 controller reads codec register */
  52 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
  53                                         unsigned short reg)
  54 {
  55         /* FIXME */
  56         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
  57         unsigned short data, tmo;
  58
  59         au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), AC97_CDC(pscdata));
  60         au_sync();
  61
  62         tmo = 1000;
  63         while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
  64                 udelay(2);
  65
  66         if (!tmo)
  67                 data = 0xffff;
  68         else
  69                 data = au_readl(AC97_CDC(pscdata)) & 0xffff;
  70
  71         au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
  72         au_sync();
  73
  74         return data;
  75 }
  76
  77 /* AC97 controller writes to codec register */
  78 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
  79                                 unsigned short val)
  80 {
  81         /* FIXME */
  82         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
  83         unsigned int tmo;
  84
  85         au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), AC97_CDC(pscdata));
  86         au_sync();
  87         tmo = 1000;
  88         while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
  89                 au_sync();
  90
  91         au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
  92         au_sync();
  93 }
  94
  95 /* AC97 controller asserts a warm reset */
  96 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
  97 {
  98         /* FIXME */
  99         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
 100
 101         au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
 102         au_sync();
 103         msleep(10);
 104         au_writel(0, AC97_RST(pscdata));
 105         au_sync();
 106 }
 107
 108 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
 109 {
 110         /* FIXME */
 111         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
 112         int i;
 113
 114         /* disable PSC during cold reset */
 115         au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
 116         au_sync();
 117         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
 118         au_sync();
 119
 120         /* issue cold reset */
 121         au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
 122         au_sync();
 123         msleep(500);
 124         au_writel(0, AC97_RST(pscdata));
 125         au_sync();
 126
 127         /* enable PSC */
 128         au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
 129         au_sync();
 130
 131         /* wait for PSC to indicate it's ready */
 132         i = 100000;
 133         while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
 134                 au_sync();
 135
 136         if (i == 0) {
 137                 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
 138                 return;
 139         }
 140
 141         /* enable the ac97 function */
 142         au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 143         au_sync();
 144
 145         /* wait for AC97 core to become ready */
 146         i = 100000;
 147         while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
 148                 au_sync();
 149         if (i == 0)
 150                 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
 151 }
 152
 153 /* AC97 controller operations */
 154 struct snd_ac97_bus_ops soc_ac97_ops = {
 155         .read           = au1xpsc_ac97_read,
 156         .write          = au1xpsc_ac97_write,
 157         .reset          = au1xpsc_ac97_cold_reset,
 158         .warm_reset     = au1xpsc_ac97_warm_reset,
 159 };
 160 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 161
 162 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
 163                                   struct snd_pcm_hw_params *params,
 164                                   struct snd_soc_dai *dai)
 165 {
 166         /* FIXME */
 167         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
 168         unsigned long r, stat;
 169         int chans, stype = SUBSTREAM_TYPE(substream);
 170
 171         chans = params_channels(params);
 172
 173         r = au_readl(AC97_CFG(pscdata));
 174         stat = au_readl(AC97_STAT(pscdata));
 175
 176         /* already active? */
 177         if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
 178                 /* reject parameters not currently set up */
 179                 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
 180                     (pscdata->rate != params_rate(params)))
 181                         return -EINVAL;
 182         } else {
 183                 /* disable AC97 device controller first */
 184                 au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 185                 au_sync();
 186
 187                 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
 188                 r &= ~PSC_AC97CFG_LEN_MASK;
 189                 r |= PSC_AC97CFG_SET_LEN(params->msbits);
 190
 191                 /* channels: enable slots for front L/R channel */
 192                 if (stype == PCM_TX) {
 193                         r &= ~PSC_AC97CFG_TXSLOT_MASK;
 194                         r |= PSC_AC97CFG_TXSLOT_ENA(3);
 195                         r |= PSC_AC97CFG_TXSLOT_ENA(4);
 196                 } else {
 197                         r &= ~PSC_AC97CFG_RXSLOT_MASK;
 198                         r |= PSC_AC97CFG_RXSLOT_ENA(3);
 199                         r |= PSC_AC97CFG_RXSLOT_ENA(4);
 200                 }
 201
 202                 /* finally enable the AC97 controller again */
 203                 au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
 204                 au_sync();
 205
 206                 pscdata->cfg = r;
 207                 pscdata->rate = params_rate(params);
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
 214                                 int cmd, struct snd_soc_dai *dai)
 215 {
 216         /* FIXME */
 217         struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
 218         int ret, stype = SUBSTREAM_TYPE(substream);
 219
 220         ret = 0;
 221
 222         switch (cmd) {
 223         case SNDRV_PCM_TRIGGER_START:
 224         case SNDRV_PCM_TRIGGER_RESUME:
 225                 au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
 226                 au_sync();
 227                 break;
 228         case SNDRV_PCM_TRIGGER_STOP:
 229         case SNDRV_PCM_TRIGGER_SUSPEND:
 230                 au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
 231                 au_sync();
 232                 break;
 233         default:
 234                 ret = -EINVAL;
 235         }
 236         return ret;
 237 }
 238
 239 static int au1xpsc_ac97_probe(struct platform_device *pdev,
 240                               struct snd_soc_dai *dai)
 241 {
 242         int ret;
 243         struct resource *r;
 244         unsigned long sel;
 245
 246         if (au1xpsc_ac97_workdata)
 247                 return -EBUSY;
 248
 249         au1xpsc_ac97_workdata =
 250                 kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
 251         if (!au1xpsc_ac97_workdata)
 252                 return -ENOMEM;
 253
 254         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 255         if (!r) {
 256                 ret = -ENODEV;
 257                 goto out0;
 258         }
 259
 260         ret = -EBUSY;
 261         au1xpsc_ac97_workdata->ioarea =
 262                 request_mem_region(r->start, r->end - r->start + 1,
 263                                         "au1xpsc_ac97");
 264         if (!au1xpsc_ac97_workdata->ioarea)
 265                 goto out0;
 266
 267         au1xpsc_ac97_workdata->mmio = ioremap(r->start, 0xffff);
 268         if (!au1xpsc_ac97_workdata->mmio)
 269                 goto out1;
 270
 271         /* configuration: max dma trigger threshold, enable ac97 */
 272          au1xpsc_ac97_workdata->cfg = PSC_AC97CFG_RT_FIFO8 |
 273                                       PSC_AC97CFG_TT_FIFO8 |
 274                                       PSC_AC97CFG_DE_ENABLE;
 275
 276         /* preserve PSC clock source set up by platform (dev.platform_data
 277          * is already occupied by soc layer)
 278          */
 279         sel = au_readl(PSC_SEL(au1xpsc_ac97_workdata)) & PSC_SEL_CLK_MASK;
 280         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
 281         au_sync();
 282         au_writel(0, PSC_SEL(au1xpsc_ac97_workdata));
 283         au_sync();
 284         au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(au1xpsc_ac97_workdata));
 285         au_sync();
 286         /* next up: cold reset.  Dont check for PSC-ready now since
 287          * there may not be any codec clock yet.
 288          */
 289
 290         return 0;
 291
 292 out1:
 293         release_resource(au1xpsc_ac97_workdata->ioarea);
 294         kfree(au1xpsc_ac97_workdata->ioarea);
 295 out0:
 296         kfree(au1xpsc_ac97_workdata);
 297         au1xpsc_ac97_workdata = NULL;
 298         return ret;
 299 }
 300
 301 static void au1xpsc_ac97_remove(struct platform_device *pdev,
 302                                 struct snd_soc_dai *dai)
 303 {
 304         /* disable PSC completely */
 305         au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
 306         au_sync();
 307         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
 308         au_sync();
 309
 310         iounmap(au1xpsc_ac97_workdata->mmio);
 311         release_resource(au1xpsc_ac97_workdata->ioarea);
 312         kfree(au1xpsc_ac97_workdata->ioarea);
 313         kfree(au1xpsc_ac97_workdata);
 314         au1xpsc_ac97_workdata = NULL;
 315 }
 316
 317 static int au1xpsc_ac97_suspend(struct snd_soc_dai *dai)
 318 {
 319         /* save interesting registers and disable PSC */
 320         au1xpsc_ac97_workdata->pm[0] =
 321                         au_readl(PSC_SEL(au1xpsc_ac97_workdata));
 322
 323         au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
 324         au_sync();
 325         au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
 326         au_sync();
 327
 328         return 0;
 329 }
 330
 331 static int au1xpsc_ac97_resume(struct snd_soc_dai *dai)
 332 {
 333         /* restore PSC clock config */
 334         au_writel(au1xpsc_ac97_workdata->pm[0] | PSC_SEL_PS_AC97MODE,
 335                         PSC_SEL(au1xpsc_ac97_workdata));
 336         au_sync();
 337
 338         /* after this point the ac97 core will cold-reset the codec.
 339          * During cold-reset the PSC is reinitialized and the last
 340          * configuration set up in hw_params() is restored.
 341          */
 342         return 0;
 343 }
 344
 345 static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
 346         .trigger        = au1xpsc_ac97_trigger,
 347         .hw_params      = au1xpsc_ac97_hw_params,
 348 };
 349
 350 struct snd_soc_dai au1xpsc_ac97_dai = {
 351         .name                   = "au1xpsc_ac97",
 352         .ac97_control           = 1,
 353         .probe                  = au1xpsc_ac97_probe,
 354         .remove                 = au1xpsc_ac97_remove,
 355         .suspend                = au1xpsc_ac97_suspend,
 356         .resume                 = au1xpsc_ac97_resume,
 357         .playback = {
 358                 .rates          = AC97_RATES,
 359                 .formats        = AC97_FMTS,
 360                 .channels_min   = 2,
 361                 .channels_max   = 2,
 362         },
 363         .capture = {
 364                 .rates          = AC97_RATES,
 365                 .formats        = AC97_FMTS,
 366                 .channels_min   = 2,
 367                 .channels_max   = 2,
 368         },
 369         .ops = &au1xpsc_ac97_dai_ops,
 370 };
 371 EXPORT_SYMBOL_GPL(au1xpsc_ac97_dai);
 372
 373 static int __init au1xpsc_ac97_init(void)
 374 {
 375         au1xpsc_ac97_workdata = NULL;
 376         return snd_soc_register_dai(&au1xpsc_ac97_dai);
 377 }
 378
 379 static void __exit au1xpsc_ac97_exit(void)
 380 {
 381         snd_soc_unregister_dai(&au1xpsc_ac97_dai);
 382 }
 383
 384 module_init(au1xpsc_ac97_init);
 385 module_exit(au1xpsc_ac97_exit);
 386
 387 MODULE_LICENSE("GPL");
 388 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
 389 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");