sound/soc/samsung/ac97.c

   1 /* sound/soc/samsung/ac97.c
   2  *
   3  * ALSA SoC Audio Layer - S3C AC97 Controller driver
   4  *      Evolved from s3c2443-ac97.c
   5  *
   6  * Copyright (c) 2010 Samsung Electronics Co. Ltd
   7  *      Author: Jaswinder Singh <jassisinghbrar@gmail.com>
   8  *      Credits: Graeme Gregory, Sean Choi
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/io.h>
  16 #include <linux/delay.h>
  17 #include <linux/clk.h>
  18 #include <linux/module.h>
  19
  20 #include <sound/soc.h>
  21
  22 #include <mach/dma.h>
  23 #include <plat/regs-ac97.h>
  24 #include <plat/audio.h>
  25
  26 #include "dma.h"
  27
  28 #define AC_CMD_ADDR(x) (x << 16)
  29 #define AC_CMD_DATA(x) (x & 0xffff)
  30
  31 #define S3C_AC97_DAI_PCM 0
  32 #define S3C_AC97_DAI_MIC 1
  33
  34 struct s3c_ac97_info {
  35         struct clk         *ac97_clk;
  36         void __iomem       *regs;
  37         struct mutex       lock;
  38         struct completion  done;
  39 };
  40 static struct s3c_ac97_info s3c_ac97;
  41
  42 static struct s3c2410_dma_client s3c_dma_client_out = {
  43         .name = "AC97 PCMOut"
  44 };
  45
  46 static struct s3c2410_dma_client s3c_dma_client_in = {
  47         .name = "AC97 PCMIn"
  48 };
  49
  50 static struct s3c2410_dma_client s3c_dma_client_micin = {
  51         .name = "AC97 MicIn"
  52 };
  53
  54 static struct s3c_dma_params s3c_ac97_pcm_out = {
  55         .client         = &s3c_dma_client_out,
  56         .dma_size       = 4,
  57 };
  58
  59 static struct s3c_dma_params s3c_ac97_pcm_in = {
  60         .client         = &s3c_dma_client_in,
  61         .dma_size       = 4,
  62 };
  63
  64 static struct s3c_dma_params s3c_ac97_mic_in = {
  65         .client         = &s3c_dma_client_micin,
  66         .dma_size       = 4,
  67 };
  68
  69 static void s3c_ac97_activate(struct snd_ac97 *ac97)
  70 {
  71         u32 ac_glbctrl, stat;
  72
  73         stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
  74         if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
  75                 return; /* Return if already active */
  76
  77         INIT_COMPLETION(s3c_ac97.done);
  78
  79         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
  80         ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
  81         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  82         msleep(1);
  83
  84         ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
  85         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  86         msleep(1);
  87
  88         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
  89         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
  90         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  91
  92         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
  93                 pr_err("AC97: Unable to activate!");
  94 }
  95
  96 static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
  97         unsigned short reg)
  98 {
  99         u32 ac_glbctrl, ac_codec_cmd;
 100         u32 stat, addr, data;
 101
 102         mutex_lock(&s3c_ac97.lock);
 103
 104         s3c_ac97_activate(ac97);
 105
 106         INIT_COMPLETION(s3c_ac97.done);
 107
 108         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 109         ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
 110         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 111
 112         udelay(50);
 113
 114         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 115         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 116         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 117
 118         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 119                 pr_err("AC97: Unable to read!");
 120
 121         stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
 122         addr = (stat >> 16) & 0x7f;
 123         data = (stat & 0xffff);
 124
 125         if (addr != reg)
 126                 pr_err("ac97: req addr = %02x, rep addr = %02x\n",
 127                         reg, addr);
 128
 129         mutex_unlock(&s3c_ac97.lock);
 130
 131         return (unsigned short)data;
 132 }
 133
 134 static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 135         unsigned short val)
 136 {
 137         u32 ac_glbctrl, ac_codec_cmd;
 138
 139         mutex_lock(&s3c_ac97.lock);
 140
 141         s3c_ac97_activate(ac97);
 142
 143         INIT_COMPLETION(s3c_ac97.done);
 144
 145         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 146         ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
 147         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 148
 149         udelay(50);
 150
 151         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 152         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 153         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 154
 155         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 156                 pr_err("AC97: Unable to write!");
 157
 158         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 159         ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
 160         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 161
 162         mutex_unlock(&s3c_ac97.lock);
 163 }
 164
 165 static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
 166 {
 167         pr_debug("AC97: Cold reset\n");
 168         writel(S3C_AC97_GLBCTRL_COLDRESET,
 169                         s3c_ac97.regs + S3C_AC97_GLBCTRL);
 170         msleep(1);
 171
 172         writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 173         msleep(1);
 174 }
 175
 176 static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
 177 {
 178         u32 stat;
 179
 180         stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
 181         if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
 182                 return; /* Return if already active */
 183
 184         pr_debug("AC97: Warm reset\n");
 185
 186         writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 187         msleep(1);
 188
 189         writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 190         msleep(1);
 191
 192         s3c_ac97_activate(ac97);
 193 }
 194
 195 static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
 196 {
 197         u32 ac_glbctrl, ac_glbstat;
 198
 199         ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
 200
 201         if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
 202
 203                 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 204                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
 205                 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 206
 207                 complete(&s3c_ac97.done);
 208         }
 209
 210         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 211         ac_glbctrl |= (1<<30); /* Clear interrupt */
 212         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 213
 214         return IRQ_HANDLED;
 215 }
 216
 217 struct snd_ac97_bus_ops soc_ac97_ops = {
 218         .read       = s3c_ac97_read,
 219         .write      = s3c_ac97_write,
 220         .warm_reset = s3c_ac97_warm_reset,
 221         .reset      = s3c_ac97_cold_reset,
 222 };
 223 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 224
 225 static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
 226                                   struct snd_pcm_hw_params *params,
 227                                   struct snd_soc_dai *dai)
 228 {
 229         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 230         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 231         struct s3c_dma_params *dma_data;
 232
 233         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 234                 dma_data = &s3c_ac97_pcm_out;
 235         else
 236                 dma_data = &s3c_ac97_pcm_in;
 237
 238         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 239
 240         return 0;
 241 }
 242
 243 static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 244                                 struct snd_soc_dai *dai)
 245 {
 246         u32 ac_glbctrl;
 247         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 248         struct s3c_dma_params *dma_data =
 249                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 250
 251         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 252         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 253                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
 254         else
 255                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
 256
 257         switch (cmd) {
 258         case SNDRV_PCM_TRIGGER_START:
 259         case SNDRV_PCM_TRIGGER_RESUME:
 260         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 261                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 262                         ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
 263                 else
 264                         ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
 265                 break;
 266
 267         case SNDRV_PCM_TRIGGER_STOP:
 268         case SNDRV_PCM_TRIGGER_SUSPEND:
 269         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 270                 break;
 271         }
 272
 273         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 274
 275         if (!dma_data->ops)
 276                 dma_data->ops = samsung_dma_get_ops();
 277
 278         dma_data->ops->started(dma_data->channel);
 279
 280         return 0;
 281 }
 282
 283 static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
 284                                       struct snd_pcm_hw_params *params,
 285                                       struct snd_soc_dai *dai)
 286 {
 287         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 288         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 289
 290         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 291                 return -ENODEV;
 292         else
 293                 snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);
 294
 295         return 0;
 296 }
 297
 298 static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
 299                                     int cmd, struct snd_soc_dai *dai)
 300 {
 301         u32 ac_glbctrl;
 302         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 303         struct s3c_dma_params *dma_data =
 304                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 305
 306         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 307         ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
 308
 309         switch (cmd) {
 310         case SNDRV_PCM_TRIGGER_START:
 311         case SNDRV_PCM_TRIGGER_RESUME:
 312         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 313                 ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
 314                 break;
 315
 316         case SNDRV_PCM_TRIGGER_STOP:
 317         case SNDRV_PCM_TRIGGER_SUSPEND:
 318         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 319                 break;
 320         }
 321
 322         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 323
 324         if (!dma_data->ops)
 325                 dma_data->ops = samsung_dma_get_ops();
 326
 327         dma_data->ops->started(dma_data->channel);
 328
 329         return 0;
 330 }
 331
 332 static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
 333         .hw_params      = s3c_ac97_hw_params,
 334         .trigger        = s3c_ac97_trigger,
 335 };
 336
 337 static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
 338         .hw_params      = s3c_ac97_hw_mic_params,
 339         .trigger        = s3c_ac97_mic_trigger,
 340 };
 341
 342 static struct snd_soc_dai_driver s3c_ac97_dai[] = {
 343         [S3C_AC97_DAI_PCM] = {
 344                 .name = "samsung-ac97",
 345                 .ac97_control = 1,
 346                 .playback = {
 347                         .stream_name = "AC97 Playback",
 348                         .channels_min = 2,
 349                         .channels_max = 2,
 350                         .rates = SNDRV_PCM_RATE_8000_48000,
 351                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 352                 .capture = {
 353                         .stream_name = "AC97 Capture",
 354                         .channels_min = 2,
 355                         .channels_max = 2,
 356                         .rates = SNDRV_PCM_RATE_8000_48000,
 357                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 358                 .ops = &s3c_ac97_dai_ops,
 359         },
 360         [S3C_AC97_DAI_MIC] = {
 361                 .name = "samsung-ac97-mic",
 362                 .ac97_control = 1,
 363                 .capture = {
 364                         .stream_name = "AC97 Mic Capture",
 365                         .channels_min = 1,
 366                         .channels_max = 1,
 367                         .rates = SNDRV_PCM_RATE_8000_48000,
 368                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 369                 .ops = &s3c_ac97_mic_dai_ops,
 370         },
 371 };
 372
 373 static __devinit int s3c_ac97_probe(struct platform_device *pdev)
 374 {
 375         struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
 376         struct s3c_audio_pdata *ac97_pdata;
 377         int ret;
 378
 379         ac97_pdata = pdev->dev.platform_data;
 380         if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
 381                 dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
 382                 return -EINVAL;
 383         }
 384
 385         /* Check for availability of necessary resource */
 386         dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 387         if (!dmatx_res) {
 388                 dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
 389                 return -ENXIO;
 390         }
 391
 392         dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 393         if (!dmarx_res) {
 394                 dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
 395                 return -ENXIO;
 396         }
 397
 398         dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
 399         if (!dmamic_res) {
 400                 dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
 401                 return -ENXIO;
 402         }
 403
 404         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 405         if (!mem_res) {
 406                 dev_err(&pdev->dev, "Unable to get register resource\n");
 407                 return -ENXIO;
 408         }
 409
 410         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 411         if (!irq_res) {
 412                 dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
 413                 return -ENXIO;
 414         }
 415
 416         if (!request_mem_region(mem_res->start,
 417                                 resource_size(mem_res), "ac97")) {
 418                 dev_err(&pdev->dev, "Unable to request register region\n");
 419                 return -EBUSY;
 420         }
 421
 422         s3c_ac97_pcm_out.channel = dmatx_res->start;
 423         s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 424         s3c_ac97_pcm_in.channel = dmarx_res->start;
 425         s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 426         s3c_ac97_mic_in.channel = dmamic_res->start;
 427         s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
 428
 429         init_completion(&s3c_ac97.done);
 430         mutex_init(&s3c_ac97.lock);
 431
 432         s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
 433         if (s3c_ac97.regs == NULL) {
 434                 dev_err(&pdev->dev, "Unable to ioremap register region\n");
 435                 ret = -ENXIO;
 436                 goto err1;
 437         }
 438
 439         s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
 440         if (IS_ERR(s3c_ac97.ac97_clk)) {
 441                 dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
 442                 ret = -ENODEV;
 443                 goto err2;
 444         }
 445         clk_enable(s3c_ac97.ac97_clk);
 446
 447         if (ac97_pdata->cfg_gpio(pdev)) {
 448                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 449                 ret = -EINVAL;
 450                 goto err3;
 451         }
 452
 453         ret = request_irq(irq_res->start, s3c_ac97_irq,
 454                                         0, "AC97", NULL);
 455         if (ret < 0) {
 456                 dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
 457                 goto err4;
 458         }
 459
 460         ret = snd_soc_register_dais(&pdev->dev, s3c_ac97_dai,
 461                         ARRAY_SIZE(s3c_ac97_dai));
 462         if (ret)
 463                 goto err5;
 464
 465         return 0;
 466
 467 err5:
 468         free_irq(irq_res->start, NULL);
 469 err4:
 470 err3:
 471         clk_disable(s3c_ac97.ac97_clk);
 472         clk_put(s3c_ac97.ac97_clk);
 473 err2:
 474         iounmap(s3c_ac97.regs);
 475 err1:
 476         release_mem_region(mem_res->start, resource_size(mem_res));
 477
 478         return ret;
 479 }
 480
 481 static __devexit int s3c_ac97_remove(struct platform_device *pdev)
 482 {
 483         struct resource *mem_res, *irq_res;
 484
 485         snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(s3c_ac97_dai));
 486
 487         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 488         if (irq_res)
 489                 free_irq(irq_res->start, NULL);
 490
 491         clk_disable(s3c_ac97.ac97_clk);
 492         clk_put(s3c_ac97.ac97_clk);
 493
 494         iounmap(s3c_ac97.regs);
 495
 496         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 497         if (mem_res)
 498                 release_mem_region(mem_res->start, resource_size(mem_res));
 499
 500         return 0;
 501 }
 502
 503 static struct platform_driver s3c_ac97_driver = {
 504         .probe  = s3c_ac97_probe,
 505         .remove = __devexit_p(s3c_ac97_remove),
 506         .driver = {
 507                 .name = "samsung-ac97",
 508                 .owner = THIS_MODULE,
 509         },
 510 };
 511
 512 module_platform_driver(s3c_ac97_driver);
 513
 514 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 515 MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
 516 MODULE_LICENSE("GPL");
 517 MODULE_ALIAS("platform:samsung-ac97");