sound/soc/at91/eti_b1_wm8731.c

   1 /*
   2  * eti_b1_wm8731  --  SoC audio for AT91RM9200-based Endrelia ETI_B1 board.
   3  *
   4  * Author:      Frank Mandarino <fmandarino@endrelia.com>
   5  *              Endrelia Technologies Inc.
   6  * Created:     Mar 29, 2006
   7  *
   8  * Based on corgi.c by:
   9  *
  10  * Copyright 2005 Wolfson Microelectronics PLC.
  11  * Copyright 2005 Openedhand Ltd.
  12  *
  13  * Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
  14  *          Richard Purdie <richard@openedhand.com>
  15  *
  16  *  This program is free software; you can redistribute  it and/or modify it
  17  *  under  the terms of  the GNU General  Public License as published by the
  18  *  Free Software Foundation;  either version 2 of the  License, or (at your
  19  *  option) any later version.
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/version.h>
  26 #include <linux/kernel.h>
  27 #include <linux/clk.h>
  28 #include <linux/timer.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_device.h>
  31 #include <sound/driver.h>
  32 #include <sound/core.h>
  33 #include <sound/pcm.h>
  34 #include <sound/soc.h>
  35 #include <sound/soc-dapm.h>
  36
  37 #include <asm/arch/hardware.h>
  38 #include <asm/arch/at91_pio.h>
  39 #include <asm/arch/gpio.h>
  40
  41 #include "../codecs/wm8731.h"
  42 #include "at91-pcm.h"
  43 #include "at91-ssc.h"
  44
  45 #if 0
  46 #define DBG(x...)       printk(KERN_INFO "eti_b1_wm8731: " x)
  47 #else
  48 #define DBG(x...)
  49 #endif
  50
  51 #define AT91_PIO_TF1    (1 << (AT91_PIN_PB6 - PIN_BASE) % 32)
  52 #define AT91_PIO_TK1    (1 << (AT91_PIN_PB7 - PIN_BASE) % 32)
  53 #define AT91_PIO_TD1    (1 << (AT91_PIN_PB8 - PIN_BASE) % 32)
  54 #define AT91_PIO_RD1    (1 << (AT91_PIN_PB9 - PIN_BASE) % 32)
  55 #define AT91_PIO_RK1    (1 << (AT91_PIN_PB10 - PIN_BASE) % 32)
  56 #define AT91_PIO_RF1    (1 << (AT91_PIN_PB11 - PIN_BASE) % 32)
  57
  58 static struct clk *pck1_clk;
  59 static struct clk *pllb_clk;
  60
  61
  62 static int eti_b1_startup(struct snd_pcm_substream *substream)
  63 {
  64         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  65         struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
  66         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
  67         int ret;
  68
  69         /* cpu clock is the AT91 master clock sent to the SSC */
  70         ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, AT91_SYSCLK_MCK,
  71                 60000000, SND_SOC_CLOCK_IN);
  72         if (ret < 0)
  73                 return ret;
  74
  75         /* codec system clock is supplied by PCK1, set to 12MHz */
  76         ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8731_SYSCLK,
  77                 12000000, SND_SOC_CLOCK_IN);
  78         if (ret < 0)
  79                 return ret;
  80
  81         /* Start PCK1 clock. */
  82         clk_enable(pck1_clk);
  83         DBG("pck1 started\n");
  84
  85         return 0;
  86 }
  87
  88 static void eti_b1_shutdown(struct snd_pcm_substream *substream)
  89 {
  90         /* Stop PCK1 clock. */
  91         clk_disable(pck1_clk);
  92         DBG("pck1 stopped\n");
  93 }
  94
  95 static int eti_b1_hw_params(struct snd_pcm_substream *substream,
  96         struct snd_pcm_hw_params *params)
  97 {
  98         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  99         struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
 100         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 101         int ret;
 102
 103 #ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
 104         unsigned int rate;
 105         int cmr_div, period;
 106
 107         /* set codec DAI configuration */
 108         ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 109                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 110         if (ret < 0)
 111                 return ret;
 112
 113         /* set cpu DAI configuration */
 114         ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 115                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 116         if (ret < 0)
 117                 return ret;
 118
 119         /*
 120          * The SSC clock dividers depend on the sample rate.  The CMR.DIV
 121          * field divides the system master clock MCK to drive the SSC TK
 122          * signal which provides the codec BCLK.  The TCMR.PERIOD and
 123          * RCMR.PERIOD fields further divide the BCLK signal to drive
 124          * the SSC TF and RF signals which provide the codec DACLRC and
 125          * ADCLRC clocks.
 126          *
 127          * The dividers were determined through trial and error, where a
 128          * CMR.DIV value is chosen such that the resulting BCLK value is
 129          * divisible, or almost divisible, by (2 * sample rate), and then
 130          * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
 131          */
 132         rate = params_rate(params);
 133
 134         switch (rate) {
 135         case 8000:
 136                 cmr_div = 25;   /* BCLK = 60MHz/(2*25) = 1.2MHz */
 137                 period = 74;    /* LRC = BCLK/(2*(74+1)) = 8000Hz */
 138                 break;
 139         case 32000:
 140                 cmr_div = 7;    /* BCLK = 60MHz/(2*7) ~= 4.28571428MHz */
 141                 period = 66;    /* LRC = BCLK/(2*(66+1)) = 31982.942Hz */
 142                 break;
 143         case 48000:
 144                 cmr_div = 13;   /* BCLK = 60MHz/(2*13) ~= 2.3076923MHz */
 145                 period = 23;    /* LRC = BCLK/(2*(23+1)) = 48076.923Hz */
 146                 break;
 147         default:
 148                 printk(KERN_WARNING "unsupported rate %d on ETI-B1 board\n", rate);
 149                 return -EINVAL;
 150         }
 151
 152         /* set the MCK divider for BCLK */
 153         ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div);
 154         if (ret < 0)
 155                 return ret;
 156
 157         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 158                 /* set the BCLK divider for DACLRC */
 159                 ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
 160                                                 AT91SSC_TCMR_PERIOD, period);
 161         } else {
 162                 /* set the BCLK divider for ADCLRC */
 163                 ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
 164                                                 AT91SSC_RCMR_PERIOD, period);
 165         }
 166         if (ret < 0)
 167                 return ret;
 168
 169 #else /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
 170         /*
 171          * Codec in Master Mode.
 172          */
 173
 174         /* set codec DAI configuration */
 175         ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 176                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
 177         if (ret < 0)
 178                 return ret;
 179
 180         /* set cpu DAI configuration */
 181         ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 182                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
 183         if (ret < 0)
 184                 return ret;
 185
 186 #endif /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
 187
 188         return 0;
 189 }
 190
 191 static struct snd_soc_ops eti_b1_ops = {
 192         .startup = eti_b1_startup,
 193         .hw_params = eti_b1_hw_params,
 194         .shutdown = eti_b1_shutdown,
 195 };
 196
 197
 198 static const struct snd_soc_dapm_widget eti_b1_dapm_widgets[] = {
 199         SND_SOC_DAPM_MIC("Int Mic", NULL),
 200         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 201 };
 202
 203 static const char *intercon[][3] = {
 204
 205         /* speaker connected to LHPOUT */
 206         {"Ext Spk", NULL, "LHPOUT"},
 207
 208         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 209         {"MICIN", NULL, "Mic Bias"},
 210         {"Mic Bias", NULL, "Int Mic"},
 211
 212         /* terminator */
 213         {NULL, NULL, NULL},
 214 };
 215
 216 /*
 217  * Logic for a wm8731 as connected on a Endrelia ETI-B1 board.
 218  */
 219 static int eti_b1_wm8731_init(struct snd_soc_codec *codec)
 220 {
 221         int i;
 222
 223         DBG("eti_b1_wm8731_init() called\n");
 224
 225         /* Add specific widgets */
 226         for(i = 0; i < ARRAY_SIZE(eti_b1_dapm_widgets); i++) {
 227                 snd_soc_dapm_new_control(codec, &eti_b1_dapm_widgets[i]);
 228         }
 229
 230         /* Set up specific audio path interconnects */
 231         for(i = 0; intercon[i][0] != NULL; i++) {
 232                 snd_soc_dapm_connect_input(codec, intercon[i][0],
 233                         intercon[i][1], intercon[i][2]);
 234         }
 235
 236         /* not connected */
 237         snd_soc_dapm_set_endpoint(codec, "RLINEIN", 0);
 238         snd_soc_dapm_set_endpoint(codec, "LLINEIN", 0);
 239
 240         /* always connected */
 241         snd_soc_dapm_set_endpoint(codec, "Int Mic", 1);
 242         snd_soc_dapm_set_endpoint(codec, "Ext Spk", 1);
 243
 244         snd_soc_dapm_sync_endpoints(codec);
 245
 246         return 0;
 247 }
 248
 249 static struct snd_soc_dai_link eti_b1_dai = {
 250         .name = "WM8731",
 251         .stream_name = "WM8731 PCM",
 252         .cpu_dai = &at91_ssc_dai[1],
 253         .codec_dai = &wm8731_dai,
 254         .init = eti_b1_wm8731_init,
 255         .ops = &eti_b1_ops,
 256 };
 257
 258 static struct snd_soc_machine snd_soc_machine_eti_b1 = {
 259         .name = "ETI_B1_WM8731",
 260         .dai_link = &eti_b1_dai,
 261         .num_links = 1,
 262 };
 263
 264 static struct wm8731_setup_data eti_b1_wm8731_setup = {
 265         .i2c_address = 0x1a,
 266 };
 267
 268 static struct snd_soc_device eti_b1_snd_devdata = {
 269         .machine = &snd_soc_machine_eti_b1,
 270         .platform = &at91_soc_platform,
 271         .codec_dev = &soc_codec_dev_wm8731,
 272         .codec_data = &eti_b1_wm8731_setup,
 273 };
 274
 275 static struct platform_device *eti_b1_snd_device;
 276
 277 static int __init eti_b1_init(void)
 278 {
 279         int ret;
 280         u32 ssc_pio_lines;
 281         struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
 282
 283         if (!request_mem_region(AT91RM9200_BASE_SSC1, SZ_16K, "soc-audio")) {
 284                 DBG("SSC1 memory region is busy\n");
 285                 return -EBUSY;
 286         }
 287
 288         ssc->base = ioremap(AT91RM9200_BASE_SSC1, SZ_16K);
 289         if (!ssc->base) {
 290                 DBG("SSC1 memory ioremap failed\n");
 291                 ret = -ENOMEM;
 292                 goto fail_release_mem;
 293         }
 294
 295         ssc->pid = AT91RM9200_ID_SSC1;
 296
 297         eti_b1_snd_device = platform_device_alloc("soc-audio", -1);
 298         if (!eti_b1_snd_device) {
 299                 DBG("platform device allocation failed\n");
 300                 ret = -ENOMEM;
 301                 goto fail_io_unmap;
 302         }
 303
 304         platform_set_drvdata(eti_b1_snd_device, &eti_b1_snd_devdata);
 305         eti_b1_snd_devdata.dev = &eti_b1_snd_device->dev;
 306
 307         ret = platform_device_add(eti_b1_snd_device);
 308         if (ret) {
 309                 DBG("platform device add failed\n");
 310                 platform_device_put(eti_b1_snd_device);
 311                 goto fail_io_unmap;
 312         }
 313
 314         ssc_pio_lines = AT91_PIO_TF1 | AT91_PIO_TK1 | AT91_PIO_TD1
 315                         | AT91_PIO_RD1 /* | AT91_PIO_RK1 */ | AT91_PIO_RF1;
 316
 317         /* Reset all PIO registers and assign lines to peripheral A */
 318         at91_sys_write(AT91_PIOB + PIO_PDR,  ssc_pio_lines);
 319         at91_sys_write(AT91_PIOB + PIO_ODR,  ssc_pio_lines);
 320         at91_sys_write(AT91_PIOB + PIO_IFDR, ssc_pio_lines);
 321         at91_sys_write(AT91_PIOB + PIO_CODR, ssc_pio_lines);
 322         at91_sys_write(AT91_PIOB + PIO_IDR,  ssc_pio_lines);
 323         at91_sys_write(AT91_PIOB + PIO_MDDR, ssc_pio_lines);
 324         at91_sys_write(AT91_PIOB + PIO_PUDR, ssc_pio_lines);
 325         at91_sys_write(AT91_PIOB + PIO_ASR,  ssc_pio_lines);
 326         at91_sys_write(AT91_PIOB + PIO_OWDR, ssc_pio_lines);
 327
 328         /*
 329          * Set PCK1 parent to PLLB and its rate to 12 Mhz.
 330          */
 331         pllb_clk = clk_get(NULL, "pllb");
 332         pck1_clk = clk_get(NULL, "pck1");
 333
 334         clk_set_parent(pck1_clk, pllb_clk);
 335         clk_set_rate(pck1_clk, 12000000);
 336
 337         DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk));
 338
 339         /* assign the GPIO pin to PCK1 */
 340         at91_set_B_periph(AT91_PIN_PA24, 0);
 341
 342 #ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
 343         printk(KERN_INFO "eti_b1_wm8731: Codec in Slave Mode\n");
 344 #else
 345         printk(KERN_INFO "eti_b1_wm8731: Codec in Master Mode\n");
 346 #endif
 347         return ret;
 348
 349 fail_io_unmap:
 350         iounmap(ssc->base);
 351 fail_release_mem:
 352         release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
 353         return ret;
 354 }
 355
 356 static void __exit eti_b1_exit(void)
 357 {
 358         struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
 359
 360         clk_put(pck1_clk);
 361         clk_put(pllb_clk);
 362
 363         platform_device_unregister(eti_b1_snd_device);
 364
 365         iounmap(ssc->base);
 366         release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
 367 }
 368
 369 module_init(eti_b1_init);
 370 module_exit(eti_b1_exit);
 371
 372 /* Module information */
 373 MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
 374 MODULE_DESCRIPTION("ALSA SoC ETI-B1-WM8731");
 375 MODULE_LICENSE("GPL");