sound/soc/atmel/playpaq_wm8510.c

   1 /* sound/soc/at32/playpaq_wm8510.c
   2  * ASoC machine driver for PlayPaq using WM8510 codec
   3  *
   4  * Copyright (C) 2008 Long Range Systems
   5  *    Geoffrey Wossum <gwossum@acm.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This code is largely inspired by sound/soc/at91/eti_b1_wm8731.c
  12  *
  13  * NOTE: If you don't have the AT32 enhanced portmux configured (which
  14  * isn't currently in the mainline or Atmel patched kernel), you will
  15  * need to set the MCLK pin (PA30) to peripheral A in your board initialization
  16  * code.  Something like:
  17  *      at32_select_periph(GPIO_PIN_PA(30), GPIO_PERIPH_A, 0);
  18  *
  19  */
  20
  21 /* #define DEBUG */
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/clk.h>
  28 #include <linux/timer.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_device.h>
  31
  32 #include <sound/core.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/soc.h>
  36 #include <sound/soc-dapm.h>
  37
  38 #include <mach/at32ap700x.h>
  39 #include <mach/portmux.h>
  40
  41 #include "../codecs/wm8510.h"
  42 #include "atmel-pcm.h"
  43 #include "atmel_ssc_dai.h"
  44
  45
  46 /*-------------------------------------------------------------------------*\
  47  * constants
  48 \*-------------------------------------------------------------------------*/
  49 #define MCLK_PIN                GPIO_PIN_PA(30)
  50 #define MCLK_PERIPH             GPIO_PERIPH_A
  51
  52
  53 /*-------------------------------------------------------------------------*\
  54  * data types
  55 \*-------------------------------------------------------------------------*/
  56 /* SSC clocking data */
  57 struct ssc_clock_data {
  58         /* CMR div */
  59         unsigned int cmr_div;
  60
  61         /* Frame period (as needed by xCMR.PERIOD) */
  62         unsigned int period;
  63
  64         /* The SSC clock rate these settings where calculated for */
  65         unsigned long ssc_rate;
  66 };
  67
  68
  69 /*-------------------------------------------------------------------------*\
  70  * module data
  71 \*-------------------------------------------------------------------------*/
  72 static struct clk *_gclk0;
  73 static struct clk *_pll0;
  74
  75 #define CODEC_CLK (_gclk0)
  76
  77
  78 /*-------------------------------------------------------------------------*\
  79  * Sound SOC operations
  80 \*-------------------------------------------------------------------------*/
  81 #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
  82 static struct ssc_clock_data playpaq_wm8510_calc_ssc_clock(
  83         struct snd_pcm_hw_params *params,
  84         struct snd_soc_dai *cpu_dai)
  85 {
  86         struct at32_ssc_info *ssc_p = cpu_dai->private_data;
  87         struct ssc_device *ssc = ssc_p->ssc;
  88         struct ssc_clock_data cd;
  89         unsigned int rate, width_bits, channels;
  90         unsigned int bitrate, ssc_div;
  91         unsigned actual_rate;
  92
  93
  94         /*
  95          * Figure out required bitrate
  96          */
  97         rate = params_rate(params);
  98         channels = params_channels(params);
  99         width_bits = snd_pcm_format_physical_width(params_format(params));
 100         bitrate = rate * width_bits * channels;
 101
 102
 103         /*
 104          * Figure out required SSC divider and period for required bitrate
 105          */
 106         cd.ssc_rate = clk_get_rate(ssc->clk);
 107         ssc_div = cd.ssc_rate / bitrate;
 108         cd.cmr_div = ssc_div / 2;
 109         if (ssc_div & 1) {
 110                 /* round cmr_div up */
 111                 cd.cmr_div++;
 112         }
 113         cd.period = width_bits - 1;
 114
 115
 116         /*
 117          * Find actual rate, compare to requested rate
 118          */
 119         actual_rate = (cd.ssc_rate / (cd.cmr_div * 2)) / (2 * (cd.period + 1));
 120         pr_debug("playpaq_wm8510: Request rate = %u, actual rate = %u\n",
 121                  rate, actual_rate);
 122
 123
 124         return cd;
 125 }
 126 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 127
 128
 129
 130 static int playpaq_wm8510_hw_params(struct snd_pcm_substream *substream,
 131                                     struct snd_pcm_hw_params *params)
 132 {
 133         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 134         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
 135         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 136         struct at32_ssc_info *ssc_p = cpu_dai->private_data;
 137         struct ssc_device *ssc = ssc_p->ssc;
 138         unsigned int pll_out = 0, bclk = 0, mclk_div = 0;
 139         int ret;
 140
 141
 142         /* Due to difficulties with getting the correct clocks from the AT32's
 143          * PLL0, we're going to let the CODEC be in charge of all the clocks
 144          */
 145 #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 146         const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
 147                                   SND_SOC_DAIFMT_NB_NF |
 148                                   SND_SOC_DAIFMT_CBM_CFM);
 149 #else
 150         struct ssc_clock_data cd;
 151         const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
 152                                   SND_SOC_DAIFMT_NB_NF |
 153                                   SND_SOC_DAIFMT_CBS_CFS);
 154 #endif
 155
 156         if (ssc == NULL) {
 157                 pr_warning("playpaq_wm8510_hw_params: ssc is NULL!\n");
 158                 return -EINVAL;
 159         }
 160
 161
 162         /*
 163          * Figure out PLL and BCLK dividers for WM8510
 164          */
 165         switch (params_rate(params)) {
 166         case 48000:
 167                 pll_out = 24576000;
 168                 mclk_div = WM8510_MCLKDIV_2;
 169                 bclk = WM8510_BCLKDIV_8;
 170                 break;
 171
 172         case 44100:
 173                 pll_out = 22579200;
 174                 mclk_div = WM8510_MCLKDIV_2;
 175                 bclk = WM8510_BCLKDIV_8;
 176                 break;
 177
 178         case 22050:
 179                 pll_out = 22579200;
 180                 mclk_div = WM8510_MCLKDIV_4;
 181                 bclk = WM8510_BCLKDIV_8;
 182                 break;
 183
 184         case 16000:
 185                 pll_out = 24576000;
 186                 mclk_div = WM8510_MCLKDIV_6;
 187                 bclk = WM8510_BCLKDIV_8;
 188                 break;
 189
 190         case 11025:
 191                 pll_out = 22579200;
 192                 mclk_div = WM8510_MCLKDIV_8;
 193                 bclk = WM8510_BCLKDIV_8;
 194                 break;
 195
 196         case 8000:
 197                 pll_out = 24576000;
 198                 mclk_div = WM8510_MCLKDIV_12;
 199                 bclk = WM8510_BCLKDIV_8;
 200                 break;
 201
 202         default:
 203                 pr_warning("playpaq_wm8510: Unsupported sample rate %d\n",
 204                            params_rate(params));
 205                 return -EINVAL;
 206         }
 207
 208
 209         /*
 210          * set CPU and CODEC DAI configuration
 211          */
 212         ret = snd_soc_dai_set_fmt(codec_dai, fmt);
 213         if (ret < 0) {
 214                 pr_warning("playpaq_wm8510: "
 215                            "Failed to set CODEC DAI format (%d)\n",
 216                            ret);
 217                 return ret;
 218         }
 219         ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
 220         if (ret < 0) {
 221                 pr_warning("playpaq_wm8510: "
 222                            "Failed to set CPU DAI format (%d)\n",
 223                            ret);
 224                 return ret;
 225         }
 226
 227
 228         /*
 229          * Set CPU clock configuration
 230          */
 231 #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 232         cd = playpaq_wm8510_calc_ssc_clock(params, cpu_dai);
 233         pr_debug("playpaq_wm8510: cmr_div = %d, period = %d\n",
 234                  cd.cmr_div, cd.period);
 235         ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_CMR_DIV, cd.cmr_div);
 236         if (ret < 0) {
 237                 pr_warning("playpaq_wm8510: Failed to set CPU CMR_DIV (%d)\n",
 238                            ret);
 239                 return ret;
 240         }
 241         ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_TCMR_PERIOD,
 242                                           cd.period);
 243         if (ret < 0) {
 244                 pr_warning("playpaq_wm8510: "
 245                            "Failed to set CPU transmit period (%d)\n",
 246                            ret);
 247                 return ret;
 248         }
 249 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 250
 251
 252         /*
 253          * Set CODEC clock configuration
 254          */
 255         pr_debug("playpaq_wm8510: "
 256                  "pll_in = %ld, pll_out = %u, bclk = %x, mclk = %x\n",
 257                  clk_get_rate(CODEC_CLK), pll_out, bclk, mclk_div);
 258
 259
 260 #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 261         ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_BCLKDIV, bclk);
 262         if (ret < 0) {
 263                 pr_warning
 264                     ("playpaq_wm8510: Failed to set CODEC DAI BCLKDIV (%d)\n",
 265                      ret);
 266                 return ret;
 267         }
 268 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 269
 270
 271         ret = snd_soc_dai_set_pll(codec_dai, 0,
 272                                          clk_get_rate(CODEC_CLK), pll_out);
 273         if (ret < 0) {
 274                 pr_warning("playpaq_wm8510: Failed to set CODEC DAI PLL (%d)\n",
 275                            ret);
 276                 return ret;
 277         }
 278
 279
 280         ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_MCLKDIV, mclk_div);
 281         if (ret < 0) {
 282                 pr_warning("playpaq_wm8510: Failed to set CODEC MCLKDIV (%d)\n",
 283                            ret);
 284                 return ret;
 285         }
 286
 287
 288         return 0;
 289 }
 290
 291
 292
 293 static struct snd_soc_ops playpaq_wm8510_ops = {
 294         .hw_params = playpaq_wm8510_hw_params,
 295 };
 296
 297
 298
 299 static const struct snd_soc_dapm_widget playpaq_dapm_widgets[] = {
 300         SND_SOC_DAPM_MIC("Int Mic", NULL),
 301         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 302 };
 303
 304
 305
 306 static const struct snd_soc_dapm_route intercon[] = {
 307         /* speaker connected to SPKOUT */
 308         {"Ext Spk", NULL, "SPKOUTP"},
 309         {"Ext Spk", NULL, "SPKOUTN"},
 310
 311         {"Mic Bias", NULL, "Int Mic"},
 312         {"MICN", NULL, "Mic Bias"},
 313         {"MICP", NULL, "Mic Bias"},
 314 };
 315
 316
 317
 318 static int playpaq_wm8510_init(struct snd_soc_codec *codec)
 319 {
 320         int i;
 321
 322         /*
 323          * Add DAPM widgets
 324          */
 325         for (i = 0; i < ARRAY_SIZE(playpaq_dapm_widgets); i++)
 326                 snd_soc_dapm_new_control(codec, &playpaq_dapm_widgets[i]);
 327
 328
 329
 330         /*
 331          * Setup audio path interconnects
 332          */
 333         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 334
 335
 336
 337         /* always connected pins */
 338         snd_soc_dapm_enable_pin(codec, "Int Mic");
 339         snd_soc_dapm_enable_pin(codec, "Ext Spk");
 340         snd_soc_dapm_sync(codec);
 341
 342
 343
 344         /* Make CSB show PLL rate */
 345         snd_soc_dai_set_clkdiv(codec->dai, WM8510_OPCLKDIV,
 346                                        WM8510_OPCLKDIV_1 | 4);
 347
 348         return 0;
 349 }
 350
 351
 352
 353 static struct snd_soc_dai_link playpaq_wm8510_dai = {
 354         .name = "WM8510",
 355         .stream_name = "WM8510 PCM",
 356         .cpu_dai = &at32_ssc_dai[0],
 357         .codec_dai = &wm8510_dai,
 358         .init = playpaq_wm8510_init,
 359         .ops = &playpaq_wm8510_ops,
 360 };
 361
 362
 363
 364 static struct snd_soc_card snd_soc_playpaq = {
 365         .name = "LRS_PlayPaq_WM8510",
 366         .platform = &at32_soc_platform,
 367         .dai_link = &playpaq_wm8510_dai,
 368         .num_links = 1,
 369 };
 370
 371
 372
 373 static struct wm8510_setup_data playpaq_wm8510_setup = {
 374         .i2c_bus = 0,
 375         .i2c_address = 0x1a,
 376 };
 377
 378
 379
 380 static struct snd_soc_device playpaq_wm8510_snd_devdata = {
 381         .card = &snd_soc_playpaq,
 382         .codec_dev = &soc_codec_dev_wm8510,
 383         .codec_data = &playpaq_wm8510_setup,
 384 };
 385
 386 static struct platform_device *playpaq_snd_device;
 387
 388
 389 static int __init playpaq_asoc_init(void)
 390 {
 391         int ret = 0;
 392         struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
 393         struct ssc_device *ssc = NULL;
 394
 395
 396         /*
 397          * Request SSC device
 398          */
 399         ssc = ssc_request(0);
 400         if (IS_ERR(ssc)) {
 401                 ret = PTR_ERR(ssc);
 402                 goto err_ssc;
 403         }
 404         ssc_p->ssc = ssc;
 405
 406
 407         /*
 408          * Configure MCLK for WM8510
 409          */
 410         _gclk0 = clk_get(NULL, "gclk0");
 411         if (IS_ERR(_gclk0)) {
 412                 _gclk0 = NULL;
 413                 goto err_gclk0;
 414         }
 415         _pll0 = clk_get(NULL, "pll0");
 416         if (IS_ERR(_pll0)) {
 417                 _pll0 = NULL;
 418                 goto err_pll0;
 419         }
 420         if (clk_set_parent(_gclk0, _pll0)) {
 421                 pr_warning("snd-soc-playpaq: "
 422                            "Failed to set PLL0 as parent for DAC clock\n");
 423                 goto err_set_clk;
 424         }
 425         clk_set_rate(CODEC_CLK, 12000000);
 426         clk_enable(CODEC_CLK);
 427
 428 #if defined CONFIG_AT32_ENHANCED_PORTMUX
 429         at32_select_periph(MCLK_PIN, MCLK_PERIPH, 0);
 430 #endif
 431
 432
 433         /*
 434          * Create and register platform device
 435          */
 436         playpaq_snd_device = platform_device_alloc("soc-audio", 0);
 437         if (playpaq_snd_device == NULL) {
 438                 ret = -ENOMEM;
 439                 goto err_device_alloc;
 440         }
 441
 442         platform_set_drvdata(playpaq_snd_device, &playpaq_wm8510_snd_devdata);
 443         playpaq_wm8510_snd_devdata.dev = &playpaq_snd_device->dev;
 444
 445         ret = platform_device_add(playpaq_snd_device);
 446         if (ret) {
 447                 pr_warning("playpaq_wm8510: platform_device_add failed (%d)\n",
 448                            ret);
 449                 goto err_device_add;
 450         }
 451
 452         return 0;
 453
 454
 455 err_device_add:
 456         if (playpaq_snd_device != NULL) {
 457                 platform_device_put(playpaq_snd_device);
 458                 playpaq_snd_device = NULL;
 459         }
 460 err_device_alloc:
 461 err_set_clk:
 462         if (_pll0 != NULL) {
 463                 clk_put(_pll0);
 464                 _pll0 = NULL;
 465         }
 466 err_pll0:
 467         if (_gclk0 != NULL) {
 468                 clk_put(_gclk0);
 469                 _gclk0 = NULL;
 470         }
 471 err_gclk0:
 472         ssc_free(ssc);
 473 err_ssc:
 474         return ret;
 475 }
 476
 477
 478 static void __exit playpaq_asoc_exit(void)
 479 {
 480         struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
 481         struct ssc_device *ssc;
 482
 483         if (ssc_p != NULL) {
 484                 ssc = ssc_p->ssc;
 485                 if (ssc != NULL)
 486                         ssc_free(ssc);
 487                 ssc_p->ssc = NULL;
 488         }
 489
 490         if (_gclk0 != NULL) {
 491                 clk_put(_gclk0);
 492                 _gclk0 = NULL;
 493         }
 494         if (_pll0 != NULL) {
 495                 clk_put(_pll0);
 496                 _pll0 = NULL;
 497         }
 498
 499 #if defined CONFIG_AT32_ENHANCED_PORTMUX
 500         at32_free_pin(MCLK_PIN);
 501 #endif
 502
 503         platform_device_unregister(playpaq_snd_device);
 504         playpaq_snd_device = NULL;
 505 }
 506
 507 module_init(playpaq_asoc_init);
 508 module_exit(playpaq_asoc_exit);
 509
 510 MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>");
 511 MODULE_DESCRIPTION("ASoC machine driver for LRS PlayPaq");
 512 MODULE_LICENSE("GPL");