sound/soc/nuc900/nuc900-ac97.c

   1 /*
   2  * Copyright (c) 2009-2010 Nuvoton technology corporation.
   3  *
   4  * Wan ZongShun <mcuos.com@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation;version 2 of the License.
   9  *
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/device.h>
  16 #include <linux/delay.h>
  17 #include <linux/mutex.h>
  18 #include <linux/suspend.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/initval.h>
  22 #include <sound/soc.h>
  23 #include <linux/clk.h>
  24
  25 #include <mach/mfp.h>
  26
  27 #include "nuc900-audio.h"
  28
  29 static DEFINE_MUTEX(ac97_mutex);
  30 struct nuc900_audio *nuc900_ac97_data;
  31
  32 static int nuc900_checkready(void)
  33 {
  34         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
  35
  36         if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
  37                 return -EPERM;
  38
  39         return 0;
  40 }
  41
  42 /* AC97 controller reads codec register */
  43 static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
  44                                         unsigned short reg)
  45 {
  46         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
  47         unsigned long timeout = 0x10000, val;
  48
  49         mutex_lock(&ac97_mutex);
  50
  51         val = nuc900_checkready();
  52         if (val) {
  53                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
  54                 goto out;
  55         }
  56
  57         /* set the R_WB bit and write register index */
  58         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
  59
  60         /* set the valid frame bit and valid slots */
  61         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
  62         val |= (VALID_FRAME | SLOT1_VALID);
  63         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
  64
  65         udelay(100);
  66
  67         /* polling the AC_R_FINISH */
  68         while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
  69                                                                 && timeout--)
  70                 mdelay(1);
  71
  72         if (!timeout) {
  73                 dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
  74                 val = -EPERM;
  75                 goto out;
  76         }
  77
  78         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
  79         val &= ~SLOT1_VALID;
  80         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
  81
  82         if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
  83                 dev_err(nuc900_audio->dev,
  84                                 "R_INDEX of REG_ACTL_ACIS1 not match!\n");
  85         }
  86
  87         udelay(100);
  88         val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
  89
  90 out:
  91         mutex_unlock(&ac97_mutex);
  92         return val;
  93 }
  94
  95 /* AC97 controller writes to codec register */
  96 static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
  97                                 unsigned short val)
  98 {
  99         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 100         unsigned long tmp, timeout = 0x10000;
 101
 102         mutex_lock(&ac97_mutex);
 103
 104         tmp = nuc900_checkready();
 105         if (tmp)
 106                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
 107
 108         /* clear the R_WB bit and write register index */
 109         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
 110
 111         /* write register value */
 112         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
 113
 114         /* set the valid frame bit and valid slots */
 115         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 116         tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
 117         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
 118
 119         udelay(100);
 120
 121         /* polling the AC_W_FINISH */
 122         while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
 123                                                                 && timeout--)
 124                 mdelay(1);
 125
 126         if (!timeout)
 127                 dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
 128
 129         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 130         tmp &= ~(SLOT1_VALID | SLOT2_VALID);
 131         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
 132
 133         mutex_unlock(&ac97_mutex);
 134
 135 }
 136
 137 static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
 138 {
 139         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 140         unsigned long val;
 141
 142         mutex_lock(&ac97_mutex);
 143
 144         /* warm reset AC 97 */
 145         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 146         val |= AC_W_RES;
 147         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
 148
 149         udelay(100);
 150
 151         val = nuc900_checkready();
 152         if (val)
 153                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
 154
 155         mutex_unlock(&ac97_mutex);
 156 }
 157
 158 static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
 159 {
 160         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 161         unsigned long val;
 162
 163         mutex_lock(&ac97_mutex);
 164
 165         /* reset Audio Controller */
 166         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 167         val |= ACTL_RESET_BIT;
 168         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 169
 170         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 171         val &= (~ACTL_RESET_BIT);
 172         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 173
 174         /* reset AC-link interface */
 175
 176         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 177         val |= AC_RESET;
 178         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 179
 180         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 181         val &= ~AC_RESET;
 182         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 183
 184         /* cold reset AC 97 */
 185         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 186         val |= AC_C_RES;
 187         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
 188
 189         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 190         val &= (~AC_C_RES);
 191         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
 192
 193         udelay(100);
 194
 195         mutex_unlock(&ac97_mutex);
 196
 197 }
 198
 199 /* AC97 controller operations */
 200 static struct snd_ac97_bus_ops nuc900_ac97_ops = {
 201         .read           = nuc900_ac97_read,
 202         .write          = nuc900_ac97_write,
 203         .reset          = nuc900_ac97_cold_reset,
 204         .warm_reset     = nuc900_ac97_warm_reset,
 205 };
 206
 207 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
 208                                 int cmd, struct snd_soc_dai *dai)
 209 {
 210         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 211         int ret;
 212         unsigned long val, tmp;
 213
 214         ret = 0;
 215
 216         switch (cmd) {
 217         case SNDRV_PCM_TRIGGER_START:
 218         case SNDRV_PCM_TRIGGER_RESUME:
 219                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 220                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 221                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 222                         tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
 223                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
 224
 225                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
 226                         tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
 227                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
 228                         val |= AC_PLAY;
 229                 } else {
 230                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
 231                         tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
 232
 233                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
 234                         val |= AC_RECORD;
 235                 }
 236
 237                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 238
 239                 break;
 240         case SNDRV_PCM_TRIGGER_STOP:
 241         case SNDRV_PCM_TRIGGER_SUSPEND:
 242                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 243                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 244                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 245                         tmp &= ~(SLOT3_VALID | SLOT4_VALID);
 246                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
 247
 248                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
 249                         val &= ~AC_PLAY;
 250                 } else {
 251                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
 252                         val &= ~AC_RECORD;
 253                 }
 254
 255                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 256
 257                 break;
 258         default:
 259                 ret = -EINVAL;
 260         }
 261
 262         return ret;
 263 }
 264
 265 static int nuc900_ac97_probe(struct snd_soc_dai *dai)
 266 {
 267         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 268         unsigned long val;
 269
 270         mutex_lock(&ac97_mutex);
 271
 272         /* enable unit clock */
 273         clk_enable(nuc900_audio->clk);
 274
 275         /* enable audio controller and AC-link interface */
 276         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 277         val |= (IIS_AC_PIN_SEL | ACLINK_EN);
 278         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
 279
 280         mutex_unlock(&ac97_mutex);
 281
 282         return 0;
 283 }
 284
 285 static int nuc900_ac97_remove(struct snd_soc_dai *dai)
 286 {
 287         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 288
 289         clk_disable(nuc900_audio->clk);
 290         return 0;
 291 }
 292
 293 static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
 294         .trigger        = nuc900_ac97_trigger,
 295 };
 296
 297 static struct snd_soc_dai_driver nuc900_ac97_dai = {
 298         .probe                  = nuc900_ac97_probe,
 299         .remove                 = nuc900_ac97_remove,
 300         .ac97_control           = 1,
 301         .playback = {
 302                 .rates          = SNDRV_PCM_RATE_8000_48000,
 303                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
 304                 .channels_min   = 1,
 305                 .channels_max   = 2,
 306         },
 307         .capture = {
 308                 .rates          = SNDRV_PCM_RATE_8000_48000,
 309                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
 310                 .channels_min   = 1,
 311                 .channels_max   = 2,
 312         },
 313         .ops = &nuc900_ac97_dai_ops,
 314 };
 315
 316 static const struct snd_soc_component_driver nuc900_ac97_component = {
 317         .name           = "nuc900-ac97",
 318 };
 319
 320 static int nuc900_ac97_drvprobe(struct platform_device *pdev)
 321 {
 322         struct nuc900_audio *nuc900_audio;
 323         int ret;
 324
 325         if (nuc900_ac97_data)
 326                 return -EBUSY;
 327
 328         nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
 329                                     GFP_KERNEL);
 330         if (!nuc900_audio)
 331                 return -ENOMEM;
 332
 333         spin_lock_init(&nuc900_audio->lock);
 334
 335         nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 336         nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
 337                                                    nuc900_audio->res);
 338         if (IS_ERR(nuc900_audio->mmio))
 339                 return PTR_ERR(nuc900_audio->mmio);
 340
 341         nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
 342         if (IS_ERR(nuc900_audio->clk)) {
 343                 ret = PTR_ERR(nuc900_audio->clk);
 344                 goto out;
 345         }
 346
 347         nuc900_audio->irq_num = platform_get_irq(pdev, 0);
 348         if (!nuc900_audio->irq_num) {
 349                 ret = -EBUSY;
 350                 goto out;
 351         }
 352
 353         nuc900_ac97_data = nuc900_audio;
 354
 355         ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
 356         if (ret)
 357                 goto out;
 358
 359         ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
 360                                          &nuc900_ac97_dai, 1);
 361         if (ret)
 362                 goto out;
 363
 364         /* enbale ac97 multifunction pin */
 365         mfp_set_groupg(nuc900_audio->dev, NULL);
 366
 367         return 0;
 368
 369 out:
 370         snd_soc_set_ac97_ops(NULL);
 371         return ret;
 372 }
 373
 374 static int nuc900_ac97_drvremove(struct platform_device *pdev)
 375 {
 376         snd_soc_unregister_component(&pdev->dev);
 377
 378         nuc900_ac97_data = NULL;
 379         snd_soc_set_ac97_ops(NULL);
 380
 381         return 0;
 382 }
 383
 384 static struct platform_driver nuc900_ac97_driver = {
 385         .driver = {
 386                 .name   = "nuc900-ac97",
 387                 .owner  = THIS_MODULE,
 388         },
 389         .probe          = nuc900_ac97_drvprobe,
 390         .remove         = nuc900_ac97_drvremove,
 391 };
 392
 393 module_platform_driver(nuc900_ac97_driver);
 394
 395 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 396 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
 397 MODULE_LICENSE("GPL");
 398 MODULE_ALIAS("platform:nuc900-ac97");