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Linux/sound/soc/imx/mx27vis_wm8974.c

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  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,
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, 0, 0);
184 }
185 
186 /*
187  * mx27vis WM8974 HiFi DAI opserations.
188  */
189 static struct snd_soc_ops mx27vis_hifi_ops = {
190         .hw_params = mx27vis_hifi_hw_params,
191         .hw_free = mx27vis_hifi_hw_free,
192 };
193 
194 
195 static int mx27vis_suspend(struct platform_device *pdev, pm_message_t state)
196 {
197         return 0;
198 }
199 
200 static int mx27vis_resume(struct platform_device *pdev)
201 {
202         return 0;
203 }
204 
205 static int mx27vis_probe(struct platform_device *pdev)
206 {
207         int ret = 0;
208 
209         ret = get_ssi_clk(0, &pdev->dev);
210 
211         if (ret < 0) {
212                 printk(KERN_ERR "%s: cant get ssi clock\n", __func__);
213                 return ret;
214         }
215 
216 
217         return 0;
218 }
219 
220 static int mx27vis_remove(struct platform_device *pdev)
221 {
222         put_ssi_clk(0);
223         return 0;
224 }
225 
226 static struct snd_soc_dai_link mx27vis_dai[] = {
227 { /* Hifi Playback*/
228         .name = "WM8974",
229         .stream_name = "WM8974 HiFi",
230         .cpu_dai = &imx_ssi_pcm_dai[0],
231         .codec_dai = &wm8974_dai,
232         .ops = &mx27vis_hifi_ops,
233 },
234 };
235 
236 static struct snd_soc_card mx27vis = {
237         .name = "mx27vis",
238         .platform = &mx1_mx2_soc_platform,
239         .probe = mx27vis_probe,
240         .remove = mx27vis_remove,
241         .suspend_pre = mx27vis_suspend,
242         .resume_post = mx27vis_resume,
243         .dai_link = mx27vis_dai,
244         .num_links = ARRAY_SIZE(mx27vis_dai),
245 };
246 
247 static struct snd_soc_device mx27vis_snd_devdata = {
248         .card = &mx27vis,
249         .codec_dev = &soc_codec_dev_wm8974,
250 };
251 
252 static struct platform_device *mx27vis_snd_device;
253 
254 /* Temporal definition of board specific behaviour */
255 void gpio_ssi_active(int ssi_num)
256 {
257         int ret = 0;
258 
259         unsigned int ssi1_pins[] = {
260                 PC20_PF_SSI1_FS,
261                 PC21_PF_SSI1_RXD,
262                 PC22_PF_SSI1_TXD,
263                 PC23_PF_SSI1_CLK,
264         };
265         unsigned int ssi2_pins[] = {
266                 PC24_PF_SSI2_FS,
267                 PC25_PF_SSI2_RXD,
268                 PC26_PF_SSI2_TXD,
269                 PC27_PF_SSI2_CLK,
270         };
271         if (ssi_num == 0)
272                 ret = mxc_gpio_setup_multiple_pins(ssi1_pins,
273                                 ARRAY_SIZE(ssi1_pins), "USB OTG");
274         else
275                 ret = mxc_gpio_setup_multiple_pins(ssi2_pins,
276                                 ARRAY_SIZE(ssi2_pins), "USB OTG");
277         if (ret)
278                 printk(KERN_ERR "Error requesting ssi %x pins\n", ssi_num);
279 }
280 
281 
282 static int __init mx27vis_init(void)
283 {
284         int ret;
285 
286         mx27vis_snd_device = platform_device_alloc("soc-audio", -1);
287         if (!mx27vis_snd_device)
288                 return -ENOMEM;
289 
290         platform_set_drvdata(mx27vis_snd_device, &mx27vis_snd_devdata);
291         mx27vis_snd_devdata.dev = &mx27vis_snd_device->dev;
292         ret = platform_device_add(mx27vis_snd_device);
293 
294         if (ret) {
295                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
296                 platform_device_put(mx27vis_snd_device);
297         }
298 
299         /* WM8974 uses SSI1 (HPCR1) via AUDMUX port 4 for audio (PPCR1) */
300         gpio_ssi_active(0);
301         audmux_connect_1_4();
302 
303         return ret;
304 }
305 
306 static void __exit mx27vis_exit(void)
307 {
308         /* We should call some "ssi_gpio_inactive()" properly */
309 }
310 
311 module_init(mx27vis_init);
312 module_exit(mx27vis_exit);
313 
314 
315 MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
316 MODULE_DESCRIPTION("ALSA SoC WM8974 mx27vis");
317 MODULE_LICENSE("GPL");
318 

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