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TOMOYO Linux Cross Reference
Linux/sound/soc/img/img-spdif-out.c

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  1 /*
  2  * IMG SPDIF output controller driver
  3  *
  4  * Copyright (C) 2015 Imagination Technologies Ltd.
  5  *
  6  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms and conditions of the GNU General Public License,
 10  * version 2, as published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/clk.h>
 14 #include <linux/init.h>
 15 #include <linux/kernel.h>
 16 #include <linux/module.h>
 17 #include <linux/of.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/pm_runtime.h>
 20 #include <linux/reset.h>
 21 
 22 #include <sound/core.h>
 23 #include <sound/dmaengine_pcm.h>
 24 #include <sound/initval.h>
 25 #include <sound/pcm.h>
 26 #include <sound/pcm_params.h>
 27 #include <sound/soc.h>
 28 
 29 #define IMG_SPDIF_OUT_TX_FIFO           0x0
 30 
 31 #define IMG_SPDIF_OUT_CTL               0x4
 32 #define IMG_SPDIF_OUT_CTL_FS_MASK       BIT(4)
 33 #define IMG_SPDIF_OUT_CTL_CLK_MASK      BIT(2)
 34 #define IMG_SPDIF_OUT_CTL_SRT_MASK      BIT(0)
 35 
 36 #define IMG_SPDIF_OUT_CSL               0x14
 37 
 38 #define IMG_SPDIF_OUT_CSH_UV            0x18
 39 #define IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT  0
 40 #define IMG_SPDIF_OUT_CSH_UV_CSH_MASK   0xff
 41 
 42 struct img_spdif_out {
 43         spinlock_t lock;
 44         void __iomem *base;
 45         struct clk *clk_sys;
 46         struct clk *clk_ref;
 47         struct snd_dmaengine_dai_dma_data dma_data;
 48         struct device *dev;
 49         struct reset_control *rst;
 50 };
 51 
 52 static int img_spdif_out_suspend(struct device *dev)
 53 {
 54         struct img_spdif_out *spdif = dev_get_drvdata(dev);
 55 
 56         clk_disable_unprepare(spdif->clk_ref);
 57 
 58         return 0;
 59 }
 60 
 61 static int img_spdif_out_resume(struct device *dev)
 62 {
 63         struct img_spdif_out *spdif = dev_get_drvdata(dev);
 64         int ret;
 65 
 66         ret = clk_prepare_enable(spdif->clk_ref);
 67         if (ret) {
 68                 dev_err(dev, "clk_enable failed: %d\n", ret);
 69                 return ret;
 70         }
 71 
 72         return 0;
 73 }
 74 
 75 static inline void img_spdif_out_writel(struct img_spdif_out *spdif, u32 val,
 76                                 u32 reg)
 77 {
 78         writel(val, spdif->base + reg);
 79 }
 80 
 81 static inline u32 img_spdif_out_readl(struct img_spdif_out *spdif, u32 reg)
 82 {
 83         return readl(spdif->base + reg);
 84 }
 85 
 86 static void img_spdif_out_reset(struct img_spdif_out *spdif)
 87 {
 88         u32 ctl, status_low, status_high;
 89 
 90         ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL) &
 91                         ~IMG_SPDIF_OUT_CTL_SRT_MASK;
 92         status_low = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
 93         status_high = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
 94 
 95         reset_control_assert(spdif->rst);
 96         reset_control_deassert(spdif->rst);
 97 
 98         img_spdif_out_writel(spdif, ctl, IMG_SPDIF_OUT_CTL);
 99         img_spdif_out_writel(spdif, status_low, IMG_SPDIF_OUT_CSL);
100         img_spdif_out_writel(spdif, status_high, IMG_SPDIF_OUT_CSH_UV);
101 }
102 
103 static int img_spdif_out_info(struct snd_kcontrol *kcontrol,
104                                         struct snd_ctl_elem_info *uinfo)
105 {
106         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
107         uinfo->count = 1;
108 
109         return 0;
110 }
111 
112 static int img_spdif_out_get_status_mask(struct snd_kcontrol *kcontrol,
113                                        struct snd_ctl_elem_value *ucontrol)
114 {
115         ucontrol->value.iec958.status[0] = 0xff;
116         ucontrol->value.iec958.status[1] = 0xff;
117         ucontrol->value.iec958.status[2] = 0xff;
118         ucontrol->value.iec958.status[3] = 0xff;
119         ucontrol->value.iec958.status[4] = 0xff;
120 
121         return 0;
122 }
123 
124 static int img_spdif_out_get_status(struct snd_kcontrol *kcontrol,
125                                   struct snd_ctl_elem_value *ucontrol)
126 {
127         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
128         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
129         u32 reg;
130         unsigned long flags;
131 
132         spin_lock_irqsave(&spdif->lock, flags);
133 
134         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
135         ucontrol->value.iec958.status[0] = reg & 0xff;
136         ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
137         ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
138         ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
139 
140         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
141         ucontrol->value.iec958.status[4] =
142                 (reg & IMG_SPDIF_OUT_CSH_UV_CSH_MASK) >>
143                 IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
144 
145         spin_unlock_irqrestore(&spdif->lock, flags);
146 
147         return 0;
148 }
149 
150 static int img_spdif_out_set_status(struct snd_kcontrol *kcontrol,
151                                   struct snd_ctl_elem_value *ucontrol)
152 {
153         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
154         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
155         u32 reg;
156         unsigned long flags;
157 
158         reg = ((u32)ucontrol->value.iec958.status[3] << 24);
159         reg |= ((u32)ucontrol->value.iec958.status[2] << 16);
160         reg |= ((u32)ucontrol->value.iec958.status[1] << 8);
161         reg |= (u32)ucontrol->value.iec958.status[0];
162 
163         spin_lock_irqsave(&spdif->lock, flags);
164 
165         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSL);
166 
167         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
168         reg &= ~IMG_SPDIF_OUT_CSH_UV_CSH_MASK;
169         reg |= (u32)ucontrol->value.iec958.status[4] <<
170                         IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
171         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSH_UV);
172 
173         spin_unlock_irqrestore(&spdif->lock, flags);
174 
175         return 0;
176 }
177 
178 static struct snd_kcontrol_new img_spdif_out_controls[] = {
179         {
180                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
181                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
182                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
183                 .info = img_spdif_out_info,
184                 .get = img_spdif_out_get_status_mask
185         },
186         {
187                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
188                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
189                 .info = img_spdif_out_info,
190                 .get = img_spdif_out_get_status,
191                 .put = img_spdif_out_set_status
192         }
193 };
194 
195 static int img_spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
196                         struct snd_soc_dai *dai)
197 {
198         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
199         u32 reg;
200         unsigned long flags;
201 
202         switch (cmd) {
203         case SNDRV_PCM_TRIGGER_START:
204         case SNDRV_PCM_TRIGGER_RESUME:
205         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
206                 reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
207                 reg |= IMG_SPDIF_OUT_CTL_SRT_MASK;
208                 img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
209                 break;
210         case SNDRV_PCM_TRIGGER_STOP:
211         case SNDRV_PCM_TRIGGER_SUSPEND:
212         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
213                 spin_lock_irqsave(&spdif->lock, flags);
214                 img_spdif_out_reset(spdif);
215                 spin_unlock_irqrestore(&spdif->lock, flags);
216                 break;
217         default:
218                 return -EINVAL;
219         }
220 
221         return 0;
222 }
223 
224 static int img_spdif_out_hw_params(struct snd_pcm_substream *substream,
225         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
226 {
227         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
228         unsigned int channels;
229         long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;
230         u32 reg;
231         snd_pcm_format_t format;
232 
233         rate = params_rate(params);
234         format = params_format(params);
235         channels = params_channels(params);
236 
237         dev_dbg(spdif->dev, "hw_params rate %ld channels %u format %u\n",
238                         rate, channels, format);
239 
240         if (format != SNDRV_PCM_FORMAT_S32_LE)
241                 return -EINVAL;
242 
243         if (channels != 2)
244                 return -EINVAL;
245 
246         pre_div_a = clk_round_rate(spdif->clk_ref, rate * 256);
247         if (pre_div_a < 0)
248                 return pre_div_a;
249         pre_div_b = clk_round_rate(spdif->clk_ref, rate * 384);
250         if (pre_div_b < 0)
251                 return pre_div_b;
252 
253         diff_a = abs((pre_div_a / 256) - rate);
254         diff_b = abs((pre_div_b / 384) - rate);
255 
256         /* If diffs are equal, use lower clock rate */
257         if (diff_a > diff_b)
258                 clk_set_rate(spdif->clk_ref, pre_div_b);
259         else
260                 clk_set_rate(spdif->clk_ref, pre_div_a);
261 
262         /*
263          * Another driver (eg machine driver) may have rejected the above
264          * change. Get the current rate and set the register bit according to
265          * the new min diff
266          */
267         clk_rate = clk_get_rate(spdif->clk_ref);
268 
269         diff_a = abs((clk_rate / 256) - rate);
270         diff_b = abs((clk_rate / 384) - rate);
271 
272         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
273         if (diff_a <= diff_b)
274                 reg &= ~IMG_SPDIF_OUT_CTL_CLK_MASK;
275         else
276                 reg |= IMG_SPDIF_OUT_CTL_CLK_MASK;
277         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
278 
279         return 0;
280 }
281 
282 static const struct snd_soc_dai_ops img_spdif_out_dai_ops = {
283         .trigger = img_spdif_out_trigger,
284         .hw_params = img_spdif_out_hw_params
285 };
286 
287 static int img_spdif_out_dai_probe(struct snd_soc_dai *dai)
288 {
289         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
290 
291         snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
292 
293         snd_soc_add_dai_controls(dai, img_spdif_out_controls,
294                         ARRAY_SIZE(img_spdif_out_controls));
295 
296         return 0;
297 }
298 
299 static struct snd_soc_dai_driver img_spdif_out_dai = {
300         .probe = img_spdif_out_dai_probe,
301         .playback = {
302                 .channels_min = 2,
303                 .channels_max = 2,
304                 .rates = SNDRV_PCM_RATE_8000_192000,
305                 .formats = SNDRV_PCM_FMTBIT_S32_LE
306         },
307         .ops = &img_spdif_out_dai_ops
308 };
309 
310 static const struct snd_soc_component_driver img_spdif_out_component = {
311         .name = "img-spdif-out"
312 };
313 
314 static int img_spdif_out_probe(struct platform_device *pdev)
315 {
316         struct img_spdif_out *spdif;
317         struct resource *res;
318         void __iomem *base;
319         int ret;
320         struct device *dev = &pdev->dev;
321 
322         spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
323         if (!spdif)
324                 return -ENOMEM;
325 
326         platform_set_drvdata(pdev, spdif);
327 
328         spdif->dev = &pdev->dev;
329 
330         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
331         base = devm_ioremap_resource(&pdev->dev, res);
332         if (IS_ERR(base))
333                 return PTR_ERR(base);
334 
335         spdif->base = base;
336 
337         spdif->rst = devm_reset_control_get(&pdev->dev, "rst");
338         if (IS_ERR(spdif->rst)) {
339                 if (PTR_ERR(spdif->rst) != -EPROBE_DEFER)
340                         dev_err(&pdev->dev, "No top level reset found\n");
341                 return PTR_ERR(spdif->rst);
342         }
343 
344         spdif->clk_sys = devm_clk_get(&pdev->dev, "sys");
345         if (IS_ERR(spdif->clk_sys)) {
346                 if (PTR_ERR(spdif->clk_sys) != -EPROBE_DEFER)
347                         dev_err(dev, "Failed to acquire clock 'sys'\n");
348                 return PTR_ERR(spdif->clk_sys);
349         }
350 
351         spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
352         if (IS_ERR(spdif->clk_ref)) {
353                 if (PTR_ERR(spdif->clk_ref) != -EPROBE_DEFER)
354                         dev_err(dev, "Failed to acquire clock 'ref'\n");
355                 return PTR_ERR(spdif->clk_ref);
356         }
357 
358         ret = clk_prepare_enable(spdif->clk_sys);
359         if (ret)
360                 return ret;
361 
362         img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK,
363                                 IMG_SPDIF_OUT_CTL);
364 
365         img_spdif_out_reset(spdif);
366 
367         pm_runtime_enable(&pdev->dev);
368         if (!pm_runtime_enabled(&pdev->dev)) {
369                 ret = img_spdif_out_resume(&pdev->dev);
370                 if (ret)
371                         goto err_pm_disable;
372         }
373 
374         spin_lock_init(&spdif->lock);
375 
376         spdif->dma_data.addr = res->start + IMG_SPDIF_OUT_TX_FIFO;
377         spdif->dma_data.addr_width = 4;
378         spdif->dma_data.maxburst = 4;
379 
380         ret = devm_snd_soc_register_component(&pdev->dev,
381                         &img_spdif_out_component,
382                         &img_spdif_out_dai, 1);
383         if (ret)
384                 goto err_suspend;
385 
386         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
387         if (ret)
388                 goto err_suspend;
389 
390         dev_dbg(&pdev->dev, "Probe successful\n");
391 
392         return 0;
393 
394 err_suspend:
395         if (!pm_runtime_status_suspended(&pdev->dev))
396                 img_spdif_out_suspend(&pdev->dev);
397 err_pm_disable:
398         pm_runtime_disable(&pdev->dev);
399         clk_disable_unprepare(spdif->clk_sys);
400 
401         return ret;
402 }
403 
404 static int img_spdif_out_dev_remove(struct platform_device *pdev)
405 {
406         struct img_spdif_out *spdif = platform_get_drvdata(pdev);
407 
408         pm_runtime_disable(&pdev->dev);
409         if (!pm_runtime_status_suspended(&pdev->dev))
410                 img_spdif_out_suspend(&pdev->dev);
411 
412         clk_disable_unprepare(spdif->clk_sys);
413 
414         return 0;
415 }
416 
417 static const struct of_device_id img_spdif_out_of_match[] = {
418         { .compatible = "img,spdif-out" },
419         {}
420 };
421 MODULE_DEVICE_TABLE(of, img_spdif_out_of_match);
422 
423 static const struct dev_pm_ops img_spdif_out_pm_ops = {
424         SET_RUNTIME_PM_OPS(img_spdif_out_suspend,
425                            img_spdif_out_resume, NULL)
426 };
427 
428 static struct platform_driver img_spdif_out_driver = {
429         .driver = {
430                 .name = "img-spdif-out",
431                 .of_match_table = img_spdif_out_of_match,
432                 .pm = &img_spdif_out_pm_ops
433         },
434         .probe = img_spdif_out_probe,
435         .remove = img_spdif_out_dev_remove
436 };
437 module_platform_driver(img_spdif_out_driver);
438 
439 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
440 MODULE_DESCRIPTION("IMG SPDIF Output driver");
441 MODULE_LICENSE("GPL v2");
442 

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