sound/soc/samsung/s3c24xx_uda134x.c

   1 /*
   2  * Modifications by Christian Pellegrin <chripell@evolware.org>
   3  *
   4  * s3c24xx_uda134x.c  --  S3C24XX_UDA134X ALSA SoC Audio board driver
   5  *
   6  * Copyright 2007 Dension Audio Systems Ltd.
   7  * Author: Zoltan Devai
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/gpio.h>
  16
  17 #include <sound/soc.h>
  18 #include <sound/s3c24xx_uda134x.h>
  19
  20 #include <plat/regs-iis.h>
  21
  22 #include "s3c24xx-i2s.h"
  23
  24 /* #define ENFORCE_RATES 1 */
  25 /*
  26   Unfortunately the S3C24XX in master mode has a limited capacity of
  27   generating the clock for the codec. If you define this only rates
  28   that are really available will be enforced. But be careful, most
  29   user level application just want the usual sampling frequencies (8,
  30   11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
  31   operation for embedded systems. So if you aren't very lucky or your
  32   hardware engineer wasn't very forward-looking it's better to leave
  33   this undefined. If you do so an approximate value for the requested
  34   sampling rate in the range -/+ 5% will be chosen. If this in not
  35   possible an error will be returned.
  36 */
  37
  38 static struct clk *xtal;
  39 static struct clk *pclk;
  40 /* this is need because we don't have a place where to keep the
  41  * pointers to the clocks in each substream. We get the clocks only
  42  * when we are actually using them so we don't block stuff like
  43  * frequency change or oscillator power-off */
  44 static int clk_users;
  45 static DEFINE_MUTEX(clk_lock);
  46
  47 static unsigned int rates[33 * 2];
  48 #ifdef ENFORCE_RATES
  49 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
  50         .count  = ARRAY_SIZE(rates),
  51         .list   = rates,
  52         .mask   = 0,
  53 };
  54 #endif
  55
  56 static struct platform_device *s3c24xx_uda134x_snd_device;
  57
  58 static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
  59 {
  60         int ret = 0;
  61 #ifdef ENFORCE_RATES
  62         struct snd_pcm_runtime *runtime = substream->runtime;
  63 #endif
  64
  65         mutex_lock(&clk_lock);
  66         pr_debug("%s %d\n", __func__, clk_users);
  67         if (clk_users == 0) {
  68                 xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
  69                 if (!xtal) {
  70                         printk(KERN_ERR "%s cannot get xtal\n", __func__);
  71                         ret = -EBUSY;
  72                 } else {
  73                         pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
  74                                        "pclk");
  75                         if (!pclk) {
  76                                 printk(KERN_ERR "%s cannot get pclk\n",
  77                                        __func__);
  78                                 clk_put(xtal);
  79                                 ret = -EBUSY;
  80                         }
  81                 }
  82                 if (!ret) {
  83                         int i, j;
  84
  85                         for (i = 0; i < 2; i++) {
  86                                 int fs = i ? 256 : 384;
  87
  88                                 rates[i*33] = clk_get_rate(xtal) / fs;
  89                                 for (j = 1; j < 33; j++)
  90                                         rates[i*33 + j] = clk_get_rate(pclk) /
  91                                                 (j * fs);
  92                         }
  93                 }
  94         }
  95         clk_users += 1;
  96         mutex_unlock(&clk_lock);
  97         if (!ret) {
  98 #ifdef ENFORCE_RATES
  99                 ret = snd_pcm_hw_constraint_list(runtime, 0,
 100                                                  SNDRV_PCM_HW_PARAM_RATE,
 101                                                  &hw_constraints_rates);
 102                 if (ret < 0)
 103                         printk(KERN_ERR "%s cannot set constraints\n",
 104                                __func__);
 105 #endif
 106         }
 107         return ret;
 108 }
 109
 110 static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
 111 {
 112         mutex_lock(&clk_lock);
 113         pr_debug("%s %d\n", __func__, clk_users);
 114         clk_users -= 1;
 115         if (clk_users == 0) {
 116                 clk_put(xtal);
 117                 xtal = NULL;
 118                 clk_put(pclk);
 119                 pclk = NULL;
 120         }
 121         mutex_unlock(&clk_lock);
 122 }
 123
 124 static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
 125                                         struct snd_pcm_hw_params *params)
 126 {
 127         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 128         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 129         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 130         unsigned int clk = 0;
 131         int ret = 0;
 132         int clk_source, fs_mode;
 133         unsigned long rate = params_rate(params);
 134         long err, cerr;
 135         unsigned int div;
 136         int i, bi;
 137
 138         err = 999999;
 139         bi = 0;
 140         for (i = 0; i < 2*33; i++) {
 141                 cerr = rates[i] - rate;
 142                 if (cerr < 0)
 143                         cerr = -cerr;
 144                 if (cerr < err) {
 145                         err = cerr;
 146                         bi = i;
 147                 }
 148         }
 149         if (bi / 33 == 1)
 150                 fs_mode = S3C2410_IISMOD_256FS;
 151         else
 152                 fs_mode = S3C2410_IISMOD_384FS;
 153         if (bi % 33 == 0) {
 154                 clk_source = S3C24XX_CLKSRC_MPLL;
 155                 div = 1;
 156         } else {
 157                 clk_source = S3C24XX_CLKSRC_PCLK;
 158                 div = bi % 33;
 159         }
 160         pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);
 161
 162         clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
 163         pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
 164                  fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
 165                  clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
 166                  div, clk, err);
 167
 168         if ((err * 100 / rate) > 5) {
 169                 printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
 170                        "too different from desired (%ld%%)\n",
 171                        err * 100 / rate);
 172                 return -EINVAL;
 173         }
 174
 175         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 176                         SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 177         if (ret < 0)
 178                 return ret;
 179
 180         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 181                         SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 182         if (ret < 0)
 183                 return ret;
 184
 185         ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk,
 186                         SND_SOC_CLOCK_IN);
 187         if (ret < 0)
 188                 return ret;
 189
 190         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode);
 191         if (ret < 0)
 192                 return ret;
 193
 194         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
 195                         S3C2410_IISMOD_32FS);
 196         if (ret < 0)
 197                 return ret;
 198
 199         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
 200                         S3C24XX_PRESCALE(div, div));
 201         if (ret < 0)
 202                 return ret;
 203
 204         /* set the codec system clock for DAC and ADC */
 205         ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
 206                         SND_SOC_CLOCK_OUT);
 207         if (ret < 0)
 208                 return ret;
 209
 210         return 0;
 211 }
 212
 213 static struct snd_soc_ops s3c24xx_uda134x_ops = {
 214         .startup = s3c24xx_uda134x_startup,
 215         .shutdown = s3c24xx_uda134x_shutdown,
 216         .hw_params = s3c24xx_uda134x_hw_params,
 217 };
 218
 219 static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
 220         .name = "UDA134X",
 221         .stream_name = "UDA134X",
 222         .codec_name = "uda134x-codec",
 223         .codec_dai_name = "uda134x-hifi",
 224         .cpu_dai_name = "s3c24xx-iis",
 225         .ops = &s3c24xx_uda134x_ops,
 226         .platform_name  = "samsung-audio",
 227 };
 228
 229 static struct snd_soc_card snd_soc_s3c24xx_uda134x = {
 230         .name = "S3C24XX_UDA134X",
 231         .dai_link = &s3c24xx_uda134x_dai_link,
 232         .num_links = 1,
 233 };
 234
 235 static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;
 236
 237 static void setdat(int v)
 238 {
 239         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
 240 }
 241
 242 static void setclk(int v)
 243 {
 244         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
 245 }
 246
 247 static void setmode(int v)
 248 {
 249         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
 250 }
 251
 252 /* FIXME - This must be codec platform data but in which board file ?? */
 253 static struct uda134x_platform_data s3c24xx_uda134x = {
 254         .l3 = {
 255                 .setdat = setdat,
 256                 .setclk = setclk,
 257                 .setmode = setmode,
 258                 .data_hold = 1,
 259                 .data_setup = 1,
 260                 .clock_high = 1,
 261                 .mode_hold = 1,
 262                 .mode = 1,
 263                 .mode_setup = 1,
 264         },
 265 };
 266
 267 static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
 268 {
 269         if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
 270                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
 271                        "l3 %s pin already in use", fun);
 272                 return -EBUSY;
 273         }
 274         gpio_direction_output(pin, 0);
 275         return 0;
 276 }
 277
 278 static int s3c24xx_uda134x_probe(struct platform_device *pdev)
 279 {
 280         int ret;
 281
 282         printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");
 283
 284         s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
 285         if (s3c24xx_uda134x_l3_pins == NULL) {
 286                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
 287                        "unable to find platform data\n");
 288                 return -ENODEV;
 289         }
 290         s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
 291         s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;
 292
 293         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
 294                                       "data") < 0)
 295                 return -EBUSY;
 296         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
 297                                       "clk") < 0) {
 298                 gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
 299                 return -EBUSY;
 300         }
 301         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
 302                                       "mode") < 0) {
 303                 gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
 304                 gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
 305                 return -EBUSY;
 306         }
 307
 308         s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
 309         if (!s3c24xx_uda134x_snd_device) {
 310                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
 311                        "Unable to register\n");
 312                 return -ENOMEM;
 313         }
 314
 315         platform_set_drvdata(s3c24xx_uda134x_snd_device,
 316                              &snd_soc_s3c24xx_uda134x);
 317         platform_device_add_data(s3c24xx_uda134x_snd_device, &s3c24xx_uda134x, sizeof(s3c24xx_uda134x));
 318         ret = platform_device_add(s3c24xx_uda134x_snd_device);
 319         if (ret) {
 320                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
 321                 platform_device_put(s3c24xx_uda134x_snd_device);
 322         }
 323
 324         return ret;
 325 }
 326
 327 static int s3c24xx_uda134x_remove(struct platform_device *pdev)
 328 {
 329         platform_device_unregister(s3c24xx_uda134x_snd_device);
 330         gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
 331         gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
 332         gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
 333         return 0;
 334 }
 335
 336 static struct platform_driver s3c24xx_uda134x_driver = {
 337         .probe  = s3c24xx_uda134x_probe,
 338         .remove = s3c24xx_uda134x_remove,
 339         .driver = {
 340                 .name = "s3c24xx_uda134x",
 341                 .owner = THIS_MODULE,
 342         },
 343 };
 344
 345 static int __init s3c24xx_uda134x_init(void)
 346 {
 347         return platform_driver_register(&s3c24xx_uda134x_driver);
 348 }
 349
 350 static void __exit s3c24xx_uda134x_exit(void)
 351 {
 352         platform_driver_unregister(&s3c24xx_uda134x_driver);
 353 }
 354
 355
 356 module_init(s3c24xx_uda134x_init);
 357 module_exit(s3c24xx_uda134x_exit);
 358
 359 MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
 360 MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
 361 MODULE_LICENSE("GPL");