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 <jassi.brar@samsung.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
  19 #include <sound/soc.h>
  20
  21 #include <mach/dma.h>
  22 #include <plat/regs-ac97.h>
  23 #include <plat/audio.h>
  24
  25 #include "dma.h"
  26
  27 #define AC_CMD_ADDR(x) (x << 16)
  28 #define AC_CMD_DATA(x) (x & 0xffff)
  29
  30 #define S3C_AC97_DAI_PCM 0
  31 #define S3C_AC97_DAI_MIC 1
  32
  33 struct s3c_ac97_info {
  34         struct clk         *ac97_clk;
  35         void __iomem       *regs;
  36         struct mutex       lock;
  37         struct completion  done;
  38 };
  39 static struct s3c_ac97_info s3c_ac97;
  40
  41 static struct s3c2410_dma_client s3c_dma_client_out = {
  42         .name = "AC97 PCMOut"
  43 };
  44
  45 static struct s3c2410_dma_client s3c_dma_client_in = {
  46         .name = "AC97 PCMIn"
  47 };
  48
  49 static struct s3c2410_dma_client s3c_dma_client_micin = {
  50         .name = "AC97 MicIn"
  51 };
  52
  53 static struct s3c_dma_params s3c_ac97_pcm_out = {
  54         .client         = &s3c_dma_client_out,
  55         .dma_size       = 4,
  56 };
  57
  58 static struct s3c_dma_params s3c_ac97_pcm_in = {
  59         .client         = &s3c_dma_client_in,
  60         .dma_size       = 4,
  61 };
  62
  63 static struct s3c_dma_params s3c_ac97_mic_in = {
  64         .client         = &s3c_dma_client_micin,
  65         .dma_size       = 4,
  66 };
  67
  68 static void s3c_ac97_activate(struct snd_ac97 *ac97)
  69 {
  70         u32 ac_glbctrl, stat;
  71
  72         stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
  73         if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
  74                 return; /* Return if already active */
  75
  76         INIT_COMPLETION(s3c_ac97.done);
  77
  78         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
  79         ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
  80         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  81         msleep(1);
  82
  83         ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
  84         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  85         msleep(1);
  86
  87         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
  88         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
  89         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
  90
  91         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
  92                 pr_err("AC97: Unable to activate!");
  93 }
  94
  95 static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
  96         unsigned short reg)
  97 {
  98         u32 ac_glbctrl, ac_codec_cmd;
  99         u32 stat, addr, data;
 100
 101         mutex_lock(&s3c_ac97.lock);
 102
 103         s3c_ac97_activate(ac97);
 104
 105         INIT_COMPLETION(s3c_ac97.done);
 106
 107         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 108         ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
 109         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 110
 111         udelay(50);
 112
 113         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 114         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 115         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 116
 117         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 118                 pr_err("AC97: Unable to read!");
 119
 120         stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
 121         addr = (stat >> 16) & 0x7f;
 122         data = (stat & 0xffff);
 123
 124         if (addr != reg)
 125                 pr_err("ac97: req addr = %02x, rep addr = %02x\n",
 126                         reg, addr);
 127
 128         mutex_unlock(&s3c_ac97.lock);
 129
 130         return (unsigned short)data;
 131 }
 132
 133 static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 134         unsigned short val)
 135 {
 136         u32 ac_glbctrl, ac_codec_cmd;
 137
 138         mutex_lock(&s3c_ac97.lock);
 139
 140         s3c_ac97_activate(ac97);
 141
 142         INIT_COMPLETION(s3c_ac97.done);
 143
 144         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 145         ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
 146         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 147
 148         udelay(50);
 149
 150         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 151         ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 152         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 153
 154         if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 155                 pr_err("AC97: Unable to write!");
 156
 157         ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 158         ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
 159         writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 160
 161         mutex_unlock(&s3c_ac97.lock);
 162 }
 163
 164 static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
 165 {
 166         pr_debug("AC97: Cold reset\n");
 167         writel(S3C_AC97_GLBCTRL_COLDRESET,
 168                         s3c_ac97.regs + S3C_AC97_GLBCTRL);
 169         msleep(1);
 170
 171         writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 172         msleep(1);
 173 }
 174
 175 static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
 176 {
 177         u32 stat;
 178
 179         stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
 180         if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
 181                 return; /* Return if already active */
 182
 183         pr_debug("AC97: Warm reset\n");
 184
 185         writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 186         msleep(1);
 187
 188         writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 189         msleep(1);
 190
 191         s3c_ac97_activate(ac97);
 192 }
 193
 194 static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
 195 {
 196         u32 ac_glbctrl, ac_glbstat;
 197
 198         ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
 199
 200         if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
 201
 202                 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 203                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
 204                 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 205
 206                 complete(&s3c_ac97.done);
 207         }
 208
 209         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 210         ac_glbctrl |= (1<<30); /* Clear interrupt */
 211         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 212
 213         return IRQ_HANDLED;
 214 }
 215
 216 struct snd_ac97_bus_ops soc_ac97_ops = {
 217         .read       = s3c_ac97_read,
 218         .write      = s3c_ac97_write,
 219         .warm_reset = s3c_ac97_warm_reset,
 220         .reset      = s3c_ac97_cold_reset,
 221 };
 222 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 223
 224 static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
 225                                   struct snd_pcm_hw_params *params,
 226                                   struct snd_soc_dai *dai)
 227 {
 228         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 229         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 230         struct s3c_dma_params *dma_data;
 231
 232         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 233                 dma_data = &s3c_ac97_pcm_out;
 234         else
 235                 dma_data = &s3c_ac97_pcm_in;
 236
 237         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 238
 239         return 0;
 240 }
 241
 242 static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 243                                 struct snd_soc_dai *dai)
 244 {
 245         u32 ac_glbctrl;
 246         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 247         struct s3c_dma_params *dma_data =
 248                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 249
 250         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 251         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 252                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
 253         else
 254                 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
 255
 256         switch (cmd) {
 257         case SNDRV_PCM_TRIGGER_START:
 258         case SNDRV_PCM_TRIGGER_RESUME:
 259         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 260                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 261                         ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
 262                 else
 263                         ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
 264                 break;
 265
 266         case SNDRV_PCM_TRIGGER_STOP:
 267         case SNDRV_PCM_TRIGGER_SUSPEND:
 268         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 269                 break;
 270         }
 271
 272         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 273
 274         s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
 275
 276         return 0;
 277 }
 278
 279 static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
 280                                       struct snd_pcm_hw_params *params,
 281                                       struct snd_soc_dai *dai)
 282 {
 283         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 284         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 285
 286         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 287                 return -ENODEV;
 288         else
 289                 snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);
 290
 291         return 0;
 292 }
 293
 294 static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
 295                                     int cmd, struct snd_soc_dai *dai)
 296 {
 297         u32 ac_glbctrl;
 298         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 299         struct s3c_dma_params *dma_data =
 300                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 301
 302         ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 303         ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
 304
 305         switch (cmd) {
 306         case SNDRV_PCM_TRIGGER_START:
 307         case SNDRV_PCM_TRIGGER_RESUME:
 308         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 309                 ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
 310                 break;
 311
 312         case SNDRV_PCM_TRIGGER_STOP:
 313         case SNDRV_PCM_TRIGGER_SUSPEND:
 314         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 315                 break;
 316         }
 317
 318         writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 319
 320         s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
 321
 322         return 0;
 323 }
 324
 325 static struct snd_soc_dai_ops s3c_ac97_dai_ops = {
 326         .hw_params      = s3c_ac97_hw_params,
 327         .trigger        = s3c_ac97_trigger,
 328 };
 329
 330 static struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
 331         .hw_params      = s3c_ac97_hw_mic_params,
 332         .trigger        = s3c_ac97_mic_trigger,
 333 };
 334
 335 static struct snd_soc_dai_driver s3c_ac97_dai[] = {
 336         [S3C_AC97_DAI_PCM] = {
 337                 .name = "samsung-ac97",
 338                 .ac97_control = 1,
 339                 .playback = {
 340                         .stream_name = "AC97 Playback",
 341                         .channels_min = 2,
 342                         .channels_max = 2,
 343                         .rates = SNDRV_PCM_RATE_8000_48000,
 344                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 345                 .capture = {
 346                         .stream_name = "AC97 Capture",
 347                         .channels_min = 2,
 348                         .channels_max = 2,
 349                         .rates = SNDRV_PCM_RATE_8000_48000,
 350                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 351                 .ops = &s3c_ac97_dai_ops,
 352         },
 353         [S3C_AC97_DAI_MIC] = {
 354                 .name = "samsung-ac97-mic",
 355                 .ac97_control = 1,
 356                 .capture = {
 357                         .stream_name = "AC97 Mic Capture",
 358                         .channels_min = 1,
 359                         .channels_max = 1,
 360                         .rates = SNDRV_PCM_RATE_8000_48000,
 361                         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 362                 .ops = &s3c_ac97_mic_dai_ops,
 363         },
 364 };
 365
 366 static __devinit int s3c_ac97_probe(struct platform_device *pdev)
 367 {
 368         struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
 369         struct s3c_audio_pdata *ac97_pdata;
 370         int ret;
 371
 372         ac97_pdata = pdev->dev.platform_data;
 373         if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
 374                 dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
 375                 return -EINVAL;
 376         }
 377
 378         /* Check for availability of necessary resource */
 379         dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 380         if (!dmatx_res) {
 381                 dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
 382                 return -ENXIO;
 383         }
 384
 385         dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 386         if (!dmarx_res) {
 387                 dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
 388                 return -ENXIO;
 389         }
 390
 391         dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
 392         if (!dmamic_res) {
 393                 dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
 394                 return -ENXIO;
 395         }
 396
 397         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 398         if (!mem_res) {
 399                 dev_err(&pdev->dev, "Unable to get register resource\n");
 400                 return -ENXIO;
 401         }
 402
 403         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 404         if (!irq_res) {
 405                 dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
 406                 return -ENXIO;
 407         }
 408
 409         if (!request_mem_region(mem_res->start,
 410                                 resource_size(mem_res), "ac97")) {
 411                 dev_err(&pdev->dev, "Unable to request register region\n");
 412                 return -EBUSY;
 413         }
 414
 415         s3c_ac97_pcm_out.channel = dmatx_res->start;
 416         s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 417         s3c_ac97_pcm_in.channel = dmarx_res->start;
 418         s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 419         s3c_ac97_mic_in.channel = dmamic_res->start;
 420         s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
 421
 422         init_completion(&s3c_ac97.done);
 423         mutex_init(&s3c_ac97.lock);
 424
 425         s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
 426         if (s3c_ac97.regs == NULL) {
 427                 dev_err(&pdev->dev, "Unable to ioremap register region\n");
 428                 ret = -ENXIO;
 429                 goto err1;
 430         }
 431
 432         s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
 433         if (IS_ERR(s3c_ac97.ac97_clk)) {
 434                 dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
 435                 ret = -ENODEV;
 436                 goto err2;
 437         }
 438         clk_enable(s3c_ac97.ac97_clk);
 439
 440         if (ac97_pdata->cfg_gpio(pdev)) {
 441                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 442                 ret = -EINVAL;
 443                 goto err3;
 444         }
 445
 446         ret = request_irq(irq_res->start, s3c_ac97_irq,
 447                                         0, "AC97", NULL);
 448         if (ret < 0) {
 449                 dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
 450                 goto err4;
 451         }
 452
 453         ret = snd_soc_register_dais(&pdev->dev, s3c_ac97_dai,
 454                         ARRAY_SIZE(s3c_ac97_dai));
 455         if (ret)
 456                 goto err5;
 457
 458         return 0;
 459
 460 err5:
 461         free_irq(irq_res->start, NULL);
 462 err4:
 463 err3:
 464         clk_disable(s3c_ac97.ac97_clk);
 465         clk_put(s3c_ac97.ac97_clk);
 466 err2:
 467         iounmap(s3c_ac97.regs);
 468 err1:
 469         release_mem_region(mem_res->start, resource_size(mem_res));
 470
 471         return ret;
 472 }
 473
 474 static __devexit int s3c_ac97_remove(struct platform_device *pdev)
 475 {
 476         struct resource *mem_res, *irq_res;
 477
 478         snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(s3c_ac97_dai));
 479
 480         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 481         if (irq_res)
 482                 free_irq(irq_res->start, NULL);
 483
 484         clk_disable(s3c_ac97.ac97_clk);
 485         clk_put(s3c_ac97.ac97_clk);
 486
 487         iounmap(s3c_ac97.regs);
 488
 489         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 490         if (mem_res)
 491                 release_mem_region(mem_res->start, resource_size(mem_res));
 492
 493         return 0;
 494 }
 495
 496 static struct platform_driver s3c_ac97_driver = {
 497         .probe  = s3c_ac97_probe,
 498         .remove = __devexit_p(s3c_ac97_remove),
 499         .driver = {
 500                 .name = "samsung-ac97",
 501                 .owner = THIS_MODULE,
 502         },
 503 };
 504
 505 static int __init s3c_ac97_init(void)
 506 {
 507         return platform_driver_register(&s3c_ac97_driver);
 508 }
 509 module_init(s3c_ac97_init);
 510
 511 static void __exit s3c_ac97_exit(void)
 512 {
 513         platform_driver_unregister(&s3c_ac97_driver);
 514 }
 515 module_exit(s3c_ac97_exit);
 516
 517 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
 518 MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
 519 MODULE_LICENSE("GPL");
 520 MODULE_ALIAS("platform:samsung-ac97");