sound/soc/at32/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/version.h>
  26 #include <linux/kernel.h>
  27 #include <linux/errno.h>
  28 #include <linux/clk.h>
  29 #include <linux/timer.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/platform_device.h>
  32
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37 #include <sound/soc-dapm.h>
  38
  39 #include <mach/at32ap700x.h>
  40 #include <mach/portmux.h>
  41
  42 #include "../codecs/wm8510.h"
  43 #include "at32-pcm.h"
  44 #include "at32-ssc.h"
  45
  46
  47 /*-------------------------------------------------------------------------*\
  48  * constants
  49 \*-------------------------------------------------------------------------*/
  50 #define MCLK_PIN                GPIO_PIN_PA(30)
  51 #define MCLK_PERIPH             GPIO_PERIPH_A
  52
  53
  54 /*-------------------------------------------------------------------------*\
  55  * data types
  56 \*-------------------------------------------------------------------------*/
  57 /* SSC clocking data */
  58 struct ssc_clock_data {
  59         /* CMR div */
  60         unsigned int cmr_div;
  61
  62         /* Frame period (as needed by xCMR.PERIOD) */
  63         unsigned int period;
  64
  65         /* The SSC clock rate these settings where calculated for */
  66         unsigned long ssc_rate;
  67 };
  68
  69
  70 /*-------------------------------------------------------------------------*\
  71  * module data
  72 \*-------------------------------------------------------------------------*/
  73 static struct clk *_gclk0;
  74 static struct clk *_pll0;
  75
  76 #define CODEC_CLK (_gclk0)
  77
  78
  79 /*-------------------------------------------------------------------------*\
  80  * Sound SOC operations
  81 \*-------------------------------------------------------------------------*/
  82 #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
  83 static struct ssc_clock_data playpaq_wm8510_calc_ssc_clock(
  84         struct snd_pcm_hw_params *params,
  85         struct snd_soc_dai *cpu_dai)
  86 {
  87         struct at32_ssc_info *ssc_p = cpu_dai->private_data;
  88         struct ssc_device *ssc = ssc_p->ssc;
  89         struct ssc_clock_data cd;
  90         unsigned int rate, width_bits, channels;
  91         unsigned int bitrate, ssc_div;
  92         unsigned actual_rate;
  93
  94
  95         /*
  96          * Figure out required bitrate
  97          */
  98         rate = params_rate(params);
  99         channels = params_channels(params);
 100         width_bits = snd_pcm_format_physical_width(params_format(params));
 101         bitrate = rate * width_bits * channels;
 102
 103
 104         /*
 105          * Figure out required SSC divider and period for required bitrate
 106          */
 107         cd.ssc_rate = clk_get_rate(ssc->clk);
 108         ssc_div = cd.ssc_rate / bitrate;
 109         cd.cmr_div = ssc_div / 2;
 110         if (ssc_div & 1) {
 111                 /* round cmr_div up */
 112                 cd.cmr_div++;
 113         }
 114         cd.period = width_bits - 1;
 115
 116
 117         /*
 118          * Find actual rate, compare to requested rate
 119          */
 120         actual_rate = (cd.ssc_rate / (cd.cmr_div * 2)) / (2 * (cd.period + 1));
 121         pr_debug("playpaq_wm8510: Request rate = %d, actual rate = %d\n",
 122                  rate, actual_rate);
 123
 124
 125         return cd;
 126 }
 127 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 128
 129
 130
 131 static int playpaq_wm8510_hw_params(struct snd_pcm_substream *substream,
 132                                     struct snd_pcm_hw_params *params)
 133 {
 134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 135         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
 136         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 137         struct at32_ssc_info *ssc_p = cpu_dai->private_data;
 138         struct ssc_device *ssc = ssc_p->ssc;
 139         unsigned int pll_out = 0, bclk = 0, mclk_div = 0;
 140         int ret;
 141
 142
 143         /* Due to difficulties with getting the correct clocks from the AT32's
 144          * PLL0, we're going to let the CODEC be in charge of all the clocks
 145          */
 146 #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 147         const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
 148                                   SND_SOC_DAIFMT_NB_NF |
 149                                   SND_SOC_DAIFMT_CBM_CFM);
 150 #else
 151         struct ssc_clock_data cd;
 152         const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
 153                                   SND_SOC_DAIFMT_NB_NF |
 154                                   SND_SOC_DAIFMT_CBS_CFS);
 155 #endif
 156
 157         if (ssc == NULL) {
 158                 pr_warning("playpaq_wm8510_hw_params: ssc is NULL!\n");
 159                 return -EINVAL;
 160         }
 161
 162
 163         /*
 164          * Figure out PLL and BCLK dividers for WM8510
 165          */
 166         switch (params_rate(params)) {
 167         case 48000:
 168                 pll_out = 12288000;
 169                 mclk_div = WM8510_MCLKDIV_1;
 170                 bclk = WM8510_BCLKDIV_8;
 171                 break;
 172
 173         case 44100:
 174                 pll_out = 11289600;
 175                 mclk_div = WM8510_MCLKDIV_1;
 176                 bclk = WM8510_BCLKDIV_8;
 177                 break;
 178
 179         case 22050:
 180                 pll_out = 11289600;
 181                 mclk_div = WM8510_MCLKDIV_2;
 182                 bclk = WM8510_BCLKDIV_8;
 183                 break;
 184
 185         case 16000:
 186                 pll_out = 12288000;
 187                 mclk_div = WM8510_MCLKDIV_3;
 188                 bclk = WM8510_BCLKDIV_8;
 189                 break;
 190
 191         case 11025:
 192                 pll_out = 11289600;
 193                 mclk_div = WM8510_MCLKDIV_4;
 194                 bclk = WM8510_BCLKDIV_8;
 195                 break;
 196
 197         case 8000:
 198                 pll_out = 12288000;
 199                 mclk_div = WM8510_MCLKDIV_6;
 200                 bclk = WM8510_BCLKDIV_8;
 201                 break;
 202
 203         default:
 204                 pr_warning("playpaq_wm8510: Unsupported sample rate %d\n",
 205                            params_rate(params));
 206                 return -EINVAL;
 207         }
 208
 209
 210         /*
 211          * set CPU and CODEC DAI configuration
 212          */
 213         ret = snd_soc_dai_set_fmt(codec_dai, fmt);
 214         if (ret < 0) {
 215                 pr_warning("playpaq_wm8510: "
 216                            "Failed to set CODEC DAI format (%d)\n",
 217                            ret);
 218                 return ret;
 219         }
 220         ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
 221         if (ret < 0) {
 222                 pr_warning("playpaq_wm8510: "
 223                            "Failed to set CPU DAI format (%d)\n",
 224                            ret);
 225                 return ret;
 226         }
 227
 228
 229         /*
 230          * Set CPU clock configuration
 231          */
 232 #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 233         cd = playpaq_wm8510_calc_ssc_clock(params, cpu_dai);
 234         pr_debug("playpaq_wm8510: cmr_div = %d, period = %d\n",
 235                  cd.cmr_div, cd.period);
 236         ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_CMR_DIV, cd.cmr_div);
 237         if (ret < 0) {
 238                 pr_warning("playpaq_wm8510: Failed to set CPU CMR_DIV (%d)\n",
 239                            ret);
 240                 return ret;
 241         }
 242         ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_TCMR_PERIOD,
 243                                           cd.period);
 244         if (ret < 0) {
 245                 pr_warning("playpaq_wm8510: "
 246                            "Failed to set CPU transmit period (%d)\n",
 247                            ret);
 248                 return ret;
 249         }
 250 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 251
 252
 253         /*
 254          * Set CODEC clock configuration
 255          */
 256         pr_debug("playpaq_wm8510: "
 257                  "pll_in = %ld, pll_out = %u, bclk = %x, mclk = %x\n",
 258                  clk_get_rate(CODEC_CLK), pll_out, bclk, mclk_div);
 259
 260
 261 #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
 262         ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_BCLKDIV, bclk);
 263         if (ret < 0) {
 264                 pr_warning
 265                     ("playpaq_wm8510: Failed to set CODEC DAI BCLKDIV (%d)\n",
 266                      ret);
 267                 return ret;
 268         }
 269 #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
 270
 271
 272         ret = snd_soc_dai_set_pll(codec_dai, 0,
 273                                          clk_get_rate(CODEC_CLK), pll_out);
 274         if (ret < 0) {
 275                 pr_warning("playpaq_wm8510: Failed to set CODEC DAI PLL (%d)\n",
 276                            ret);
 277                 return ret;
 278         }
 279
 280
 281         ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_MCLKDIV, mclk_div);
 282         if (ret < 0) {
 283                 pr_warning("playpaq_wm8510: Failed to set CODEC MCLKDIV (%d)\n",
 284                            ret);
 285                 return ret;
 286         }
 287
 288
 289         return 0;
 290 }
 291
 292
 293
 294 static struct snd_soc_ops playpaq_wm8510_ops = {
 295         .hw_params = playpaq_wm8510_hw_params,
 296 };
 297
 298
 299
 300 static const struct snd_soc_dapm_widget playpaq_dapm_widgets[] = {
 301         SND_SOC_DAPM_MIC("Int Mic", NULL),
 302         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 303 };
 304
 305
 306
 307 static const struct snd_soc_dapm_route intercon[] = {
 308         /* speaker connected to SPKOUT */
 309         {"Ext Spk", NULL, "SPKOUTP"},
 310         {"Ext Spk", NULL, "SPKOUTN"},
 311
 312         {"Mic Bias", NULL, "Int Mic"},
 313         {"MICN", NULL, "Mic Bias"},
 314         {"MICP", NULL, "Mic Bias"},
 315 };
 316
 317
 318
 319 static int playpaq_wm8510_init(struct snd_soc_codec *codec)
 320 {
 321         int i;
 322
 323         /*
 324          * Add DAPM widgets
 325          */
 326         for (i = 0; i < ARRAY_SIZE(playpaq_dapm_widgets); i++)
 327                 snd_soc_dapm_new_control(codec, &playpaq_dapm_widgets[i]);
 328
 329
 330
 331         /*
 332          * Setup audio path interconnects
 333          */
 334         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 335
 336
 337
 338         /* always connected pins */
 339         snd_soc_dapm_enable_pin(codec, "Int Mic");
 340         snd_soc_dapm_enable_pin(codec, "Ext Spk");
 341         snd_soc_dapm_sync(codec);
 342
 343
 344
 345         /* Make CSB show PLL rate */
 346         snd_soc_dai_set_clkdiv(codec->dai, WM8510_OPCLKDIV,
 347                                        WM8510_OPCLKDIV_1 | 4);
 348
 349         return 0;
 350 }
 351
 352
 353
 354 static struct snd_soc_dai_link playpaq_wm8510_dai = {
 355         .name = "WM8510",
 356         .stream_name = "WM8510 PCM",
 357         .cpu_dai = &at32_ssc_dai[0],
 358         .codec_dai = &wm8510_dai,
 359         .init = playpaq_wm8510_init,
 360         .ops = &playpaq_wm8510_ops,
 361 };
 362
 363
 364
 365 static struct snd_soc_machine snd_soc_machine_playpaq = {
 366         .name = "LRS_PlayPaq_WM8510",
 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         .machine = &snd_soc_machine_playpaq,
 382         .platform = &at32_soc_platform,
 383         .codec_dev = &soc_codec_dev_wm8510,
 384         .codec_data = &playpaq_wm8510_setup,
 385 };
 386
 387 static struct platform_device *playpaq_snd_device;
 388
 389
 390 static int __init playpaq_asoc_init(void)
 391 {
 392         int ret = 0;
 393         struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
 394         struct ssc_device *ssc = NULL;
 395
 396
 397         /*
 398          * Request SSC device
 399          */
 400         ssc = ssc_request(0);
 401         if (IS_ERR(ssc)) {
 402                 ret = PTR_ERR(ssc);
 403                 goto err_ssc;
 404         }
 405         ssc_p->ssc = ssc;
 406
 407
 408         /*
 409          * Configure MCLK for WM8510
 410          */
 411         _gclk0 = clk_get(NULL, "gclk0");
 412         if (IS_ERR(_gclk0)) {
 413                 _gclk0 = NULL;
 414                 goto err_gclk0;
 415         }
 416         _pll0 = clk_get(NULL, "pll0");
 417         if (IS_ERR(_pll0)) {
 418                 _pll0 = NULL;
 419                 goto err_pll0;
 420         }
 421         if (clk_set_parent(_gclk0, _pll0)) {
 422                 pr_warning("snd-soc-playpaq: "
 423                            "Failed to set PLL0 as parent for DAC clock\n");
 424                 goto err_set_clk;
 425         }
 426         clk_set_rate(CODEC_CLK, 12000000);
 427         clk_enable(CODEC_CLK);
 428
 429 #if defined CONFIG_AT32_ENHANCED_PORTMUX
 430         at32_select_periph(MCLK_PIN, MCLK_PERIPH, 0);
 431 #endif
 432
 433
 434         /*
 435          * Create and register platform device
 436          */
 437         playpaq_snd_device = platform_device_alloc("soc-audio", 0);
 438         if (playpaq_snd_device == NULL) {
 439                 ret = -ENOMEM;
 440                 goto err_device_alloc;
 441         }
 442
 443         platform_set_drvdata(playpaq_snd_device, &playpaq_wm8510_snd_devdata);
 444         playpaq_wm8510_snd_devdata.dev = &playpaq_snd_device->dev;
 445
 446         ret = platform_device_add(playpaq_snd_device);
 447         if (ret) {
 448                 pr_warning("playpaq_wm8510: platform_device_add failed (%d)\n",
 449                            ret);
 450                 goto err_device_add;
 451         }
 452
 453         return 0;
 454
 455
 456 err_device_add:
 457         if (playpaq_snd_device != NULL) {
 458                 platform_device_put(playpaq_snd_device);
 459                 playpaq_snd_device = NULL;
 460         }
 461 err_device_alloc:
 462 err_set_clk:
 463         if (_pll0 != NULL) {
 464                 clk_put(_pll0);
 465                 _pll0 = NULL;
 466         }
 467 err_pll0:
 468         if (_gclk0 != NULL) {
 469                 clk_put(_gclk0);
 470                 _gclk0 = NULL;
 471         }
 472 err_gclk0:
 473         ssc_free(ssc);
 474 err_ssc:
 475         return ret;
 476 }
 477
 478
 479 static void __exit playpaq_asoc_exit(void)
 480 {
 481         struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
 482         struct ssc_device *ssc;
 483
 484         if (ssc_p != NULL) {
 485                 ssc = ssc_p->ssc;
 486                 if (ssc != NULL)
 487                         ssc_free(ssc);
 488                 ssc_p->ssc = NULL;
 489         }
 490
 491         if (_gclk0 != NULL) {
 492                 clk_put(_gclk0);
 493                 _gclk0 = NULL;
 494         }
 495         if (_pll0 != NULL) {
 496                 clk_put(_pll0);
 497                 _pll0 = NULL;
 498         }
 499
 500 #if defined CONFIG_AT32_ENHANCED_PORTMUX
 501         at32_free_pin(MCLK_PIN);
 502 #endif
 503
 504         platform_device_unregister(playpaq_snd_device);
 505         playpaq_snd_device = NULL;
 506 }
 507
 508 module_init(playpaq_asoc_init);
 509 module_exit(playpaq_asoc_exit);
 510
 511 MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>");
 512 MODULE_DESCRIPTION("ASoC machine driver for LRS PlayPaq");
 513 MODULE_LICENSE("GPL");