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Linux/sound/soc/spear/spdif_out.c

  1 /*
  2  * ALSA SoC SPDIF Out Audio Layer for spear processors
  3  *
  4  * Copyright (C) 2012 ST Microelectronics
  5  * Vipin Kumar <vipin.kumar@st.com>
  6  *
  7  * This file is licensed under the terms of the GNU General Public
  8  * License version 2. This program is licensed "as is" without any
  9  * warranty of any kind, whether express or implied.
 10  */
 11 
 12 #include <linux/clk.h>
 13 #include <linux/delay.h>
 14 #include <linux/device.h>
 15 #include <linux/kernel.h>
 16 #include <linux/init.h>
 17 #include <linux/io.h>
 18 #include <linux/ioport.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_device.h>
 21 #include <sound/dmaengine_pcm.h>
 22 #include <sound/soc.h>
 23 #include <sound/spear_dma.h>
 24 #include <sound/spear_spdif.h>
 25 #include "spdif_out_regs.h"
 26 #include "spear_pcm.h"
 27 
 28 struct spdif_out_params {
 29         u32 rate;
 30         u32 core_freq;
 31         u32 mute;
 32 };
 33 
 34 struct spdif_out_dev {
 35         struct clk *clk;
 36         struct spear_dma_data dma_params;
 37         struct spdif_out_params saved_params;
 38         u32 running;
 39         void __iomem *io_base;
 40         struct snd_dmaengine_dai_dma_data dma_params_tx;
 41         struct snd_dmaengine_pcm_config config;
 42 };
 43 
 44 static void spdif_out_configure(struct spdif_out_dev *host)
 45 {
 46         writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
 47         mdelay(1);
 48         writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
 49                         host->io_base + SPDIF_OUT_SOFT_RST);
 50 
 51         writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
 52                         SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
 53                         SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
 54                         host->io_base + SPDIF_OUT_CFG);
 55 
 56         writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
 57         writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
 58 }
 59 
 60 static int spdif_out_startup(struct snd_pcm_substream *substream,
 61                 struct snd_soc_dai *cpu_dai)
 62 {
 63         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
 64         int ret;
 65 
 66         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 67                 return -EINVAL;
 68 
 69         ret = clk_enable(host->clk);
 70         if (ret)
 71                 return ret;
 72 
 73         host->running = true;
 74         spdif_out_configure(host);
 75 
 76         return 0;
 77 }
 78 
 79 static void spdif_out_shutdown(struct snd_pcm_substream *substream,
 80                 struct snd_soc_dai *dai)
 81 {
 82         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 83 
 84         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 85                 return;
 86 
 87         clk_disable(host->clk);
 88         host->running = false;
 89 }
 90 
 91 static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
 92                 u32 rate)
 93 {
 94         u32 divider, ctrl;
 95 
 96         clk_set_rate(host->clk, core_freq);
 97         divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
 98 
 99         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
100         ctrl &= ~SPDIF_DIVIDER_MASK;
101         ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
102         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
103 }
104 
105 static int spdif_out_hw_params(struct snd_pcm_substream *substream,
106                 struct snd_pcm_hw_params *params,
107                 struct snd_soc_dai *dai)
108 {
109         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
110         u32 rate, core_freq;
111 
112         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
113                 return -EINVAL;
114 
115         rate = params_rate(params);
116 
117         switch (rate) {
118         case 8000:
119         case 16000:
120         case 32000:
121         case 64000:
122                 /*
123                  * The clock is multiplied by 10 to bring it to feasible range
124                  * of frequencies for sscg
125                  */
126                 core_freq = 64000 * 128 * 10;   /* 81.92 MHz */
127                 break;
128         case 5512:
129         case 11025:
130         case 22050:
131         case 44100:
132         case 88200:
133         case 176400:
134                 core_freq = 176400 * 128;       /* 22.5792 MHz */
135                 break;
136         case 48000:
137         case 96000:
138         case 192000:
139         default:
140                 core_freq = 192000 * 128;       /* 24.576 MHz */
141                 break;
142         }
143 
144         spdif_out_clock(host, core_freq, rate);
145         host->saved_params.core_freq = core_freq;
146         host->saved_params.rate = rate;
147 
148         return 0;
149 }
150 
151 static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
152                 struct snd_soc_dai *dai)
153 {
154         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
155         u32 ctrl;
156         int ret = 0;
157 
158         if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
159                 return -EINVAL;
160 
161         switch (cmd) {
162         case SNDRV_PCM_TRIGGER_START:
163         case SNDRV_PCM_TRIGGER_RESUME:
164         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
165                         ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
166                         ctrl &= ~SPDIF_OPMODE_MASK;
167                         if (!host->saved_params.mute)
168                                 ctrl |= SPDIF_OPMODE_AUD_DATA |
169                                         SPDIF_STATE_NORMAL;
170                         else
171                                 ctrl |= SPDIF_OPMODE_MUTE_PCM;
172                         writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
173                 break;
174 
175         case SNDRV_PCM_TRIGGER_STOP:
176         case SNDRV_PCM_TRIGGER_SUSPEND:
177         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
178                 ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
179                 ctrl &= ~SPDIF_OPMODE_MASK;
180                 ctrl |= SPDIF_OPMODE_OFF;
181                 writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
182                 break;
183 
184         default:
185                 ret = -EINVAL;
186                 break;
187         }
188         return ret;
189 }
190 
191 static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
192 {
193         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
194         u32 val;
195 
196         host->saved_params.mute = mute;
197         val = readl(host->io_base + SPDIF_OUT_CTRL);
198         val &= ~SPDIF_OPMODE_MASK;
199 
200         if (mute)
201                 val |= SPDIF_OPMODE_MUTE_PCM;
202         else {
203                 if (host->running)
204                         val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
205                 else
206                         val |= SPDIF_OPMODE_OFF;
207         }
208 
209         writel(val, host->io_base + SPDIF_OUT_CTRL);
210         return 0;
211 }
212 
213 static int spdif_mute_get(struct snd_kcontrol *kcontrol,
214                 struct snd_ctl_elem_value *ucontrol)
215 {
216         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
217         struct snd_soc_card *card = codec->card;
218         struct snd_soc_pcm_runtime *rtd = card->rtd;
219         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
220         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
221 
222         ucontrol->value.integer.value[0] = host->saved_params.mute;
223         return 0;
224 }
225 
226 static int spdif_mute_put(struct snd_kcontrol *kcontrol,
227                 struct snd_ctl_elem_value *ucontrol)
228 {
229         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
230         struct snd_soc_card *card = codec->card;
231         struct snd_soc_pcm_runtime *rtd = card->rtd;
232         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
233         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
234 
235         if (host->saved_params.mute == ucontrol->value.integer.value[0])
236                 return 0;
237 
238         spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
239 
240         return 1;
241 }
242 static const struct snd_kcontrol_new spdif_out_controls[] = {
243         SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
244                         spdif_mute_get, spdif_mute_put),
245 };
246 
247 static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
248 {
249         struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
250 
251         host->dma_params_tx.filter_data = &host->dma_params;
252         dai->playback_dma_data = &host->dma_params_tx;
253 
254         return snd_soc_add_dai_controls(dai, spdif_out_controls,
255                                 ARRAY_SIZE(spdif_out_controls));
256 }
257 
258 static const struct snd_soc_dai_ops spdif_out_dai_ops = {
259         .digital_mute   = spdif_digital_mute,
260         .startup        = spdif_out_startup,
261         .shutdown       = spdif_out_shutdown,
262         .trigger        = spdif_out_trigger,
263         .hw_params      = spdif_out_hw_params,
264 };
265 
266 static struct snd_soc_dai_driver spdif_out_dai = {
267         .playback = {
268                 .channels_min = 2,
269                 .channels_max = 2,
270                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
271                                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
272                                  SNDRV_PCM_RATE_192000),
273                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
274         },
275         .probe = spdif_soc_dai_probe,
276         .ops = &spdif_out_dai_ops,
277 };
278 
279 static const struct snd_soc_component_driver spdif_out_component = {
280         .name           = "spdif-out",
281 };
282 
283 static int spdif_out_probe(struct platform_device *pdev)
284 {
285         struct spdif_out_dev *host;
286         struct spear_spdif_platform_data *pdata;
287         struct resource *res;
288         int ret;
289 
290         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
291         if (!host) {
292                 dev_warn(&pdev->dev, "kzalloc fail\n");
293                 return -ENOMEM;
294         }
295 
296         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
297         host->io_base = devm_ioremap_resource(&pdev->dev, res);
298         if (IS_ERR(host->io_base))
299                 return PTR_ERR(host->io_base);
300 
301         host->clk = devm_clk_get(&pdev->dev, NULL);
302         if (IS_ERR(host->clk))
303                 return PTR_ERR(host->clk);
304 
305         pdata = dev_get_platdata(&pdev->dev);
306 
307         host->dma_params.data = pdata->dma_params;
308         host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
309         host->dma_params.max_burst = 16;
310         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
311 
312         dev_set_drvdata(&pdev->dev, host);
313 
314         ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component,
315                                               &spdif_out_dai, 1);
316         if (ret)
317                 return ret;
318 
319         return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
320                                                 pdata->filter);
321 }
322 
323 #ifdef CONFIG_PM
324 static int spdif_out_suspend(struct device *dev)
325 {
326         struct platform_device *pdev = to_platform_device(dev);
327         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
328 
329         if (host->running)
330                 clk_disable(host->clk);
331 
332         return 0;
333 }
334 
335 static int spdif_out_resume(struct device *dev)
336 {
337         struct platform_device *pdev = to_platform_device(dev);
338         struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
339 
340         if (host->running) {
341                 clk_enable(host->clk);
342                 spdif_out_configure(host);
343                 spdif_out_clock(host, host->saved_params.core_freq,
344                                 host->saved_params.rate);
345         }
346         return 0;
347 }
348 
349 static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
350                 spdif_out_resume);
351 
352 #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
353 
354 #else
355 #define SPDIF_OUT_DEV_PM_OPS NULL
356 
357 #endif
358 
359 static struct platform_driver spdif_out_driver = {
360         .probe          = spdif_out_probe,
361         .driver         = {
362                 .name   = "spdif-out",
363                 .owner  = THIS_MODULE,
364                 .pm     = SPDIF_OUT_DEV_PM_OPS,
365         },
366 };
367 
368 module_platform_driver(spdif_out_driver);
369 
370 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
371 MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
372 MODULE_LICENSE("GPL");
373 MODULE_ALIAS("platform:spdif_out");
374 

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