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