sound/soc/imx/mx27vis_wm8974.c

   1 /*
   2  * mx27vis_wm8974.c  --  SoC audio for mx27vis
   3  *
   4  * Copyright 2009 Vista Silicon S.L.
   5  * Author: Javier Martin
   6  *         javier.martin@vista-silicon.com
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/device.h>
  18 #include <linux/i2c.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/soc.h>
  22 #include <sound/soc-dapm.h>
  23
  24
  25 #include "../codecs/wm8974.h"
  26 #include "mx1_mx2-pcm.h"
  27 #include "mxc-ssi.h"
  28 #include <mach/gpio.h>
  29 #include <mach/iomux.h>
  30
  31 #define IGNORED_ARG 0
  32
  33
  34 static struct snd_soc_card mx27vis;
  35
  36 /**
  37   * This function connects SSI1 (HPCR1) as slave to
  38   * SSI1 external signals (PPCR1)
  39   * As slave, HPCR1 must set TFSDIR and TCLKDIR as inputs from
  40   * port 4
  41   */
  42 void audmux_connect_1_4(void)
  43 {
  44         pr_debug("AUDMUX: normal operation mode\n");
  45         /* Reset HPCR1 and PPCR1 */
  46
  47         DAM_HPCR1 = 0x00000000;
  48         DAM_PPCR1 = 0x00000000;
  49
  50         /* set to synchronous */
  51         DAM_HPCR1 |= AUDMUX_HPCR_SYN;
  52         DAM_PPCR1 |= AUDMUX_PPCR_SYN;
  53
  54
  55         /* set Rx sources 1 <--> 4 */
  56         DAM_HPCR1 |= AUDMUX_HPCR_RXDSEL(3); /* port 4 */
  57         DAM_PPCR1 |= AUDMUX_PPCR_RXDSEL(0); /* port 1 */
  58
  59         /* set Tx frame and Clock direction and source  4 --> 1 output */
  60         DAM_HPCR1 |= AUDMUX_HPCR_TFSDIR | AUDMUX_HPCR_TCLKDIR;
  61         DAM_HPCR1 |= AUDMUX_HPCR_TFCSEL(3); /* TxDS and TxCclk from port 4 */
  62
  63         return;
  64 }
  65
  66 static int mx27vis_hifi_hw_params(struct snd_pcm_substream *substream,
  67         struct snd_pcm_hw_params *params)
  68 {
  69         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  70         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
  71         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  72         unsigned int pll_out = 0, bclk = 0, fmt = 0, mclk = 0;
  73         int ret = 0;
  74
  75         /*
  76          * The WM8974 is better at generating accurate audio clocks than the
  77          * MX27 SSI controller, so we will use it as master when we can.
  78          */
  79         switch (params_rate(params)) {
  80         case 8000:
  81                 fmt = SND_SOC_DAIFMT_CBM_CFM;
  82                 mclk = WM8974_MCLKDIV_12;
  83                 pll_out = 24576000;
  84                 break;
  85         case 16000:
  86                 fmt = SND_SOC_DAIFMT_CBM_CFM;
  87                 pll_out = 12288000;
  88                 break;
  89         case 48000:
  90                 fmt = SND_SOC_DAIFMT_CBM_CFM;
  91                 bclk = WM8974_BCLKDIV_4;
  92                 pll_out = 12288000;
  93                 break;
  94         case 96000:
  95                 fmt = SND_SOC_DAIFMT_CBM_CFM;
  96                 bclk = WM8974_BCLKDIV_2;
  97                 pll_out = 12288000;
  98                 break;
  99         case 11025:
 100                 fmt = SND_SOC_DAIFMT_CBM_CFM;
 101                 bclk = WM8974_BCLKDIV_16;
 102                 pll_out = 11289600;
 103                 break;
 104         case 22050:
 105                 fmt = SND_SOC_DAIFMT_CBM_CFM;
 106                 bclk = WM8974_BCLKDIV_8;
 107                 pll_out = 11289600;
 108                 break;
 109         case 44100:
 110                 fmt = SND_SOC_DAIFMT_CBM_CFM;
 111                 bclk = WM8974_BCLKDIV_4;
 112                 mclk = WM8974_MCLKDIV_2;
 113                 pll_out = 11289600;
 114                 break;
 115         case 88200:
 116                 fmt = SND_SOC_DAIFMT_CBM_CFM;
 117                 bclk = WM8974_BCLKDIV_2;
 118                 pll_out = 11289600;
 119                 break;
 120         }
 121
 122         /* set codec DAI configuration */
 123         ret = codec_dai->ops->set_fmt(codec_dai,
 124                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
 125                 SND_SOC_DAIFMT_SYNC | fmt);
 126         if (ret < 0) {
 127                 printk(KERN_ERR "Error from codec DAI configuration\n");
 128                 return ret;
 129         }
 130
 131         /* set cpu DAI configuration */
 132         ret = cpu_dai->ops->set_fmt(cpu_dai,
 133                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 134                 SND_SOC_DAIFMT_SYNC | fmt);
 135         if (ret < 0) {
 136                 printk(KERN_ERR "Error from cpu DAI configuration\n");
 137                 return ret;
 138         }
 139
 140         /* Put DC field of STCCR to 1 (not zero) */
 141         ret = cpu_dai->ops->set_tdm_slot(cpu_dai, 0, 2);
 142
 143         /* set the SSI system clock as input */
 144         ret = cpu_dai->ops->set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, 0,
 145                 SND_SOC_CLOCK_IN);
 146         if (ret < 0) {
 147                 printk(KERN_ERR "Error when setting system SSI clk\n");
 148                 return ret;
 149         }
 150
 151         /* set codec BCLK division for sample rate */
 152         ret = codec_dai->ops->set_clkdiv(codec_dai, WM8974_BCLKDIV, bclk);
 153         if (ret < 0) {
 154                 printk(KERN_ERR "Error when setting BCLK division\n");
 155                 return ret;
 156         }
 157
 158
 159         /* codec PLL input is 25 MHz */
 160         ret = codec_dai->ops->set_pll(codec_dai, IGNORED_ARG, IGNORED_ARG,
 161                                         25000000, pll_out);
 162         if (ret < 0) {
 163                 printk(KERN_ERR "Error when setting PLL input\n");
 164                 return ret;
 165         }
 166
 167         /*set codec MCLK division for sample rate */
 168         ret = codec_dai->ops->set_clkdiv(codec_dai, WM8974_MCLKDIV, mclk);
 169         if (ret < 0) {
 170                 printk(KERN_ERR "Error when setting MCLK division\n");
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int mx27vis_hifi_hw_free(struct snd_pcm_substream *substream)
 178 {
 179         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 180         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
 181
 182         /* disable the PLL */
 183         return codec_dai->ops->set_pll(codec_dai, IGNORED_ARG, IGNORED_ARG,
 184                                        0, 0);
 185 }
 186
 187 /*
 188  * mx27vis WM8974 HiFi DAI opserations.
 189  */
 190 static struct snd_soc_ops mx27vis_hifi_ops = {
 191         .hw_params = mx27vis_hifi_hw_params,
 192         .hw_free = mx27vis_hifi_hw_free,
 193 };
 194
 195
 196 static int mx27vis_suspend(struct platform_device *pdev, pm_message_t state)
 197 {
 198         return 0;
 199 }
 200
 201 static int mx27vis_resume(struct platform_device *pdev)
 202 {
 203         return 0;
 204 }
 205
 206 static int mx27vis_probe(struct platform_device *pdev)
 207 {
 208         int ret = 0;
 209
 210         ret = get_ssi_clk(0, &pdev->dev);
 211
 212         if (ret < 0) {
 213                 printk(KERN_ERR "%s: cant get ssi clock\n", __func__);
 214                 return ret;
 215         }
 216
 217
 218         return 0;
 219 }
 220
 221 static int mx27vis_remove(struct platform_device *pdev)
 222 {
 223         put_ssi_clk(0);
 224         return 0;
 225 }
 226
 227 static struct snd_soc_dai_link mx27vis_dai[] = {
 228 { /* Hifi Playback*/
 229         .name = "WM8974",
 230         .stream_name = "WM8974 HiFi",
 231         .cpu_dai = &imx_ssi_pcm_dai[0],
 232         .codec_dai = &wm8974_dai,
 233         .ops = &mx27vis_hifi_ops,
 234 },
 235 };
 236
 237 static struct snd_soc_card mx27vis = {
 238         .name = "mx27vis",
 239         .platform = &mx1_mx2_soc_platform,
 240         .probe = mx27vis_probe,
 241         .remove = mx27vis_remove,
 242         .suspend_pre = mx27vis_suspend,
 243         .resume_post = mx27vis_resume,
 244         .dai_link = mx27vis_dai,
 245         .num_links = ARRAY_SIZE(mx27vis_dai),
 246 };
 247
 248 static struct snd_soc_device mx27vis_snd_devdata = {
 249         .card = &mx27vis,
 250         .codec_dev = &soc_codec_dev_wm8974,
 251 };
 252
 253 static struct platform_device *mx27vis_snd_device;
 254
 255 /* Temporal definition of board specific behaviour */
 256 void gpio_ssi_active(int ssi_num)
 257 {
 258         int ret = 0;
 259
 260         unsigned int ssi1_pins[] = {
 261                 PC20_PF_SSI1_FS,
 262                 PC21_PF_SSI1_RXD,
 263                 PC22_PF_SSI1_TXD,
 264                 PC23_PF_SSI1_CLK,
 265         };
 266         unsigned int ssi2_pins[] = {
 267                 PC24_PF_SSI2_FS,
 268                 PC25_PF_SSI2_RXD,
 269                 PC26_PF_SSI2_TXD,
 270                 PC27_PF_SSI2_CLK,
 271         };
 272         if (ssi_num == 0)
 273                 ret = mxc_gpio_setup_multiple_pins(ssi1_pins,
 274                                 ARRAY_SIZE(ssi1_pins), "USB OTG");
 275         else
 276                 ret = mxc_gpio_setup_multiple_pins(ssi2_pins,
 277                                 ARRAY_SIZE(ssi2_pins), "USB OTG");
 278         if (ret)
 279                 printk(KERN_ERR "Error requesting ssi %x pins\n", ssi_num);
 280 }
 281
 282
 283 static int __init mx27vis_init(void)
 284 {
 285         int ret;
 286
 287         mx27vis_snd_device = platform_device_alloc("soc-audio", -1);
 288         if (!mx27vis_snd_device)
 289                 return -ENOMEM;
 290
 291         platform_set_drvdata(mx27vis_snd_device, &mx27vis_snd_devdata);
 292         mx27vis_snd_devdata.dev = &mx27vis_snd_device->dev;
 293         ret = platform_device_add(mx27vis_snd_device);
 294
 295         if (ret) {
 296                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 297                 platform_device_put(mx27vis_snd_device);
 298         }
 299
 300         /* WM8974 uses SSI1 (HPCR1) via AUDMUX port 4 for audio (PPCR1) */
 301         gpio_ssi_active(0);
 302         audmux_connect_1_4();
 303
 304         return ret;
 305 }
 306
 307 static void __exit mx27vis_exit(void)
 308 {
 309         /* We should call some "ssi_gpio_inactive()" properly */
 310 }
 311
 312 module_init(mx27vis_init);
 313 module_exit(mx27vis_exit);
 314
 315
 316 MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
 317 MODULE_DESCRIPTION("ALSA SoC WM8974 mx27vis");
 318 MODULE_LICENSE("GPL");