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 struct snd_ac97_bus_ops soc_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 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 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         .ac97_control           = 1,
 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 int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
 318 {
 319         struct nuc900_audio *nuc900_audio;
 320         int ret;
 321
 322         if (nuc900_ac97_data)
 323                 return -EBUSY;
 324
 325         nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL);
 326         if (!nuc900_audio)
 327                 return -ENOMEM;
 328
 329         spin_lock_init(&nuc900_audio->lock);
 330
 331         nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 332         if (!nuc900_audio->res) {
 333                 ret = -ENODEV;
 334                 goto out0;
 335         }
 336
 337         if (!request_mem_region(nuc900_audio->res->start,
 338                         resource_size(nuc900_audio->res), pdev->name)) {
 339                 ret = -EBUSY;
 340                 goto out0;
 341         }
 342
 343         nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
 344                                         resource_size(nuc900_audio->res));
 345         if (!nuc900_audio->mmio) {
 346                 ret = -ENOMEM;
 347                 goto out1;
 348         }
 349
 350         nuc900_audio->clk = clk_get(&pdev->dev, NULL);
 351         if (IS_ERR(nuc900_audio->clk)) {
 352                 ret = PTR_ERR(nuc900_audio->clk);
 353                 goto out2;
 354         }
 355
 356         nuc900_audio->irq_num = platform_get_irq(pdev, 0);
 357         if (!nuc900_audio->irq_num) {
 358                 ret = -EBUSY;
 359                 goto out3;
 360         }
 361
 362         nuc900_ac97_data = nuc900_audio;
 363
 364         ret = snd_soc_register_dai(&pdev->dev, &nuc900_ac97_dai);
 365         if (ret)
 366                 goto out3;
 367
 368         /* enbale ac97 multifunction pin */
 369         mfp_set_groupg(nuc900_audio->dev, NULL);
 370
 371         return 0;
 372
 373 out3:
 374         clk_put(nuc900_audio->clk);
 375 out2:
 376         iounmap(nuc900_audio->mmio);
 377 out1:
 378         release_mem_region(nuc900_audio->res->start,
 379                                         resource_size(nuc900_audio->res));
 380 out0:
 381         kfree(nuc900_audio);
 382         return ret;
 383 }
 384
 385 static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
 386 {
 387         snd_soc_unregister_dai(&pdev->dev);
 388
 389         clk_put(nuc900_ac97_data->clk);
 390         iounmap(nuc900_ac97_data->mmio);
 391         release_mem_region(nuc900_ac97_data->res->start,
 392                                 resource_size(nuc900_ac97_data->res));
 393
 394         kfree(nuc900_ac97_data);
 395         nuc900_ac97_data = NULL;
 396
 397         return 0;
 398 }
 399
 400 static struct platform_driver nuc900_ac97_driver = {
 401         .driver = {
 402                 .name   = "nuc900-ac97",
 403                 .owner  = THIS_MODULE,
 404         },
 405         .probe          = nuc900_ac97_drvprobe,
 406         .remove         = __devexit_p(nuc900_ac97_drvremove),
 407 };
 408
 409 module_platform_driver(nuc900_ac97_driver);
 410
 411 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 412 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
 413 MODULE_LICENSE("GPL");
 414 MODULE_ALIAS("platform:nuc900-ac97");