Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/sound/soc/adi/axi-spdif.c

  1 /*
  2  * Copyright (C) 2012-2013, Analog Devices Inc.
  3  * Author: Lars-Peter Clausen <lars@metafoo.de>
  4  *
  5  * Licensed under the GPL-2.
  6  */
  7 
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/platform_device.h>
 12 #include <linux/slab.h>
 13 #include <linux/of.h>
 14 #include <linux/clk.h>
 15 #include <linux/regmap.h>
 16 
 17 #include <sound/core.h>
 18 #include <sound/pcm.h>
 19 #include <sound/pcm_params.h>
 20 #include <sound/soc.h>
 21 #include <sound/initval.h>
 22 #include <sound/dmaengine_pcm.h>
 23 
 24 #define AXI_SPDIF_REG_CTRL      0x0
 25 #define AXI_SPDIF_REG_STAT      0x4
 26 #define AXI_SPDIF_REG_TX_FIFO   0xc
 27 
 28 #define AXI_SPDIF_CTRL_TXDATA BIT(1)
 29 #define AXI_SPDIF_CTRL_TXEN BIT(0)
 30 #define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8
 31 #define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8)
 32 
 33 #define AXI_SPDIF_FREQ_44100    (0x0 << 6)
 34 #define AXI_SPDIF_FREQ_48000    (0x1 << 6)
 35 #define AXI_SPDIF_FREQ_32000    (0x2 << 6)
 36 #define AXI_SPDIF_FREQ_NA       (0x3 << 6)
 37 
 38 struct axi_spdif {
 39         struct regmap *regmap;
 40         struct clk *clk;
 41         struct clk *clk_ref;
 42 
 43         struct snd_dmaengine_dai_dma_data dma_data;
 44 
 45         struct snd_ratnum ratnum;
 46         struct snd_pcm_hw_constraint_ratnums rate_constraints;
 47 };
 48 
 49 static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 50         struct snd_soc_dai *dai)
 51 {
 52         struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 53         unsigned int val;
 54 
 55         switch (cmd) {
 56         case SNDRV_PCM_TRIGGER_START:
 57         case SNDRV_PCM_TRIGGER_RESUME:
 58         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 59                 val = AXI_SPDIF_CTRL_TXDATA;
 60                 break;
 61         case SNDRV_PCM_TRIGGER_STOP:
 62         case SNDRV_PCM_TRIGGER_SUSPEND:
 63         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 64                 val = 0;
 65                 break;
 66         default:
 67                 return -EINVAL;
 68         }
 69 
 70         regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
 71                 AXI_SPDIF_CTRL_TXDATA, val);
 72 
 73         return 0;
 74 }
 75 
 76 static int axi_spdif_hw_params(struct snd_pcm_substream *substream,
 77         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 78 {
 79         struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
 80         unsigned int rate = params_rate(params);
 81         unsigned int clkdiv, stat;
 82 
 83         switch (params_rate(params)) {
 84         case 32000:
 85                 stat = AXI_SPDIF_FREQ_32000;
 86                 break;
 87         case 44100:
 88                 stat = AXI_SPDIF_FREQ_44100;
 89                 break;
 90         case 48000:
 91                 stat = AXI_SPDIF_FREQ_48000;
 92                 break;
 93         default:
 94                 stat = AXI_SPDIF_FREQ_NA;
 95                 break;
 96         }
 97 
 98         clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref),
 99                         rate * 64 * 2) - 1;
100         clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET;
101 
102         regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat);
103         regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
104                 AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv);
105 
106         return 0;
107 }
108 
109 static int axi_spdif_dai_probe(struct snd_soc_dai *dai)
110 {
111         struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
112 
113         snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
114 
115         return 0;
116 }
117 
118 static int axi_spdif_startup(struct snd_pcm_substream *substream,
119         struct snd_soc_dai *dai)
120 {
121         struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
122         int ret;
123 
124         ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
125                            SNDRV_PCM_HW_PARAM_RATE,
126                            &spdif->rate_constraints);
127         if (ret)
128                 return ret;
129 
130         ret = clk_prepare_enable(spdif->clk_ref);
131         if (ret)
132                 return ret;
133 
134         regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
135                 AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN);
136 
137         return 0;
138 }
139 
140 static void axi_spdif_shutdown(struct snd_pcm_substream *substream,
141         struct snd_soc_dai *dai)
142 {
143         struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
144 
145         regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
146                 AXI_SPDIF_CTRL_TXEN, 0);
147 
148         clk_disable_unprepare(spdif->clk_ref);
149 }
150 
151 static const struct snd_soc_dai_ops axi_spdif_dai_ops = {
152         .startup = axi_spdif_startup,
153         .shutdown = axi_spdif_shutdown,
154         .trigger = axi_spdif_trigger,
155         .hw_params = axi_spdif_hw_params,
156 };
157 
158 static struct snd_soc_dai_driver axi_spdif_dai = {
159         .probe = axi_spdif_dai_probe,
160         .playback = {
161                 .channels_min = 2,
162                 .channels_max = 2,
163                 .rates = SNDRV_PCM_RATE_KNOT,
164                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
165         },
166         .ops = &axi_spdif_dai_ops,
167 };
168 
169 static const struct snd_soc_component_driver axi_spdif_component = {
170         .name = "axi-spdif",
171 };
172 
173 static const struct regmap_config axi_spdif_regmap_config = {
174         .reg_bits = 32,
175         .reg_stride = 4,
176         .val_bits = 32,
177         .max_register = AXI_SPDIF_REG_STAT,
178 };
179 
180 static int axi_spdif_probe(struct platform_device *pdev)
181 {
182         struct axi_spdif *spdif;
183         struct resource *res;
184         void __iomem *base;
185         int ret;
186 
187         spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
188         if (!spdif)
189                 return -ENOMEM;
190 
191         platform_set_drvdata(pdev, spdif);
192 
193         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
194         base = devm_ioremap_resource(&pdev->dev, res);
195         if (IS_ERR(base))
196                 return PTR_ERR(base);
197 
198         spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base,
199                                             &axi_spdif_regmap_config);
200         if (IS_ERR(spdif->regmap))
201                 return PTR_ERR(spdif->regmap);
202 
203         spdif->clk = devm_clk_get(&pdev->dev, "axi");
204         if (IS_ERR(spdif->clk))
205                 return PTR_ERR(spdif->clk);
206 
207         spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
208         if (IS_ERR(spdif->clk_ref))
209                 return PTR_ERR(spdif->clk_ref);
210 
211         ret = clk_prepare_enable(spdif->clk);
212         if (ret)
213                 return ret;
214 
215         spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO;
216         spdif->dma_data.addr_width = 4;
217         spdif->dma_data.maxburst = 1;
218 
219         spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128;
220         spdif->ratnum.den_step = 1;
221         spdif->ratnum.den_min = 1;
222         spdif->ratnum.den_max = 64;
223 
224         spdif->rate_constraints.rats = &spdif->ratnum;
225         spdif->rate_constraints.nrats = 1;
226 
227         ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component,
228                                          &axi_spdif_dai, 1);
229         if (ret)
230                 goto err_clk_disable;
231 
232         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
233         if (ret)
234                 goto err_clk_disable;
235 
236         return 0;
237 
238 err_clk_disable:
239         clk_disable_unprepare(spdif->clk);
240         return ret;
241 }
242 
243 static int axi_spdif_dev_remove(struct platform_device *pdev)
244 {
245         struct axi_spdif *spdif = platform_get_drvdata(pdev);
246 
247         clk_disable_unprepare(spdif->clk);
248 
249         return 0;
250 }
251 
252 static const struct of_device_id axi_spdif_of_match[] = {
253         { .compatible = "adi,axi-spdif-tx-1.00.a", },
254         {},
255 };
256 MODULE_DEVICE_TABLE(of, axi_spdif_of_match);
257 
258 static struct platform_driver axi_spdif_driver = {
259         .driver = {
260                 .name = "axi-spdif",
261                 .owner = THIS_MODULE,
262                 .of_match_table = axi_spdif_of_match,
263         },
264         .probe = axi_spdif_probe,
265         .remove = axi_spdif_dev_remove,
266 };
267 module_platform_driver(axi_spdif_driver);
268 
269 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
270 MODULE_DESCRIPTION("AXI SPDIF driver");
271 MODULE_LICENSE("GPL");
272 

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