This source file includes following definitions.
- tegra20_i2s_runtime_suspend
- tegra20_i2s_runtime_resume
- tegra20_i2s_set_fmt
- tegra20_i2s_hw_params
- tegra20_i2s_start_playback
- tegra20_i2s_stop_playback
- tegra20_i2s_start_capture
- tegra20_i2s_stop_capture
- tegra20_i2s_trigger
- tegra20_i2s_probe
- tegra20_i2s_wr_rd_reg
- tegra20_i2s_volatile_reg
- tegra20_i2s_precious_reg
- tegra20_i2s_platform_probe
- tegra20_i2s_platform_remove
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17 #include <linux/clk.h>
18 #include <linux/device.h>
19 #include <linux/io.h>
20 #include <linux/module.h>
21 #include <linux/of.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/regmap.h>
25 #include <linux/slab.h>
26 #include <sound/core.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/soc.h>
30 #include <sound/dmaengine_pcm.h>
31
32 #include "tegra20_i2s.h"
33
34 #define DRV_NAME "tegra20-i2s"
35
36 static int tegra20_i2s_runtime_suspend(struct device *dev)
37 {
38 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
39
40 clk_disable_unprepare(i2s->clk_i2s);
41
42 return 0;
43 }
44
45 static int tegra20_i2s_runtime_resume(struct device *dev)
46 {
47 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
48 int ret;
49
50 ret = clk_prepare_enable(i2s->clk_i2s);
51 if (ret) {
52 dev_err(dev, "clk_enable failed: %d\n", ret);
53 return ret;
54 }
55
56 return 0;
57 }
58
59 static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
60 unsigned int fmt)
61 {
62 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
63 unsigned int mask = 0, val = 0;
64
65 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
66 case SND_SOC_DAIFMT_NB_NF:
67 break;
68 default:
69 return -EINVAL;
70 }
71
72 mask |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
73 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
74 case SND_SOC_DAIFMT_CBS_CFS:
75 val |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
76 break;
77 case SND_SOC_DAIFMT_CBM_CFM:
78 break;
79 default:
80 return -EINVAL;
81 }
82
83 mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
84 TEGRA20_I2S_CTRL_LRCK_MASK;
85 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
86 case SND_SOC_DAIFMT_DSP_A:
87 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
88 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
89 break;
90 case SND_SOC_DAIFMT_DSP_B:
91 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
92 val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
93 break;
94 case SND_SOC_DAIFMT_I2S:
95 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
96 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
97 break;
98 case SND_SOC_DAIFMT_RIGHT_J:
99 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
100 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
101 break;
102 case SND_SOC_DAIFMT_LEFT_J:
103 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
104 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
111
112 return 0;
113 }
114
115 static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
116 struct snd_pcm_hw_params *params,
117 struct snd_soc_dai *dai)
118 {
119 struct device *dev = dai->dev;
120 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
121 unsigned int mask, val;
122 int ret, sample_size, srate, i2sclock, bitcnt;
123
124 mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
125 switch (params_format(params)) {
126 case SNDRV_PCM_FORMAT_S16_LE:
127 val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
128 sample_size = 16;
129 break;
130 case SNDRV_PCM_FORMAT_S24_LE:
131 val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
132 sample_size = 24;
133 break;
134 case SNDRV_PCM_FORMAT_S32_LE:
135 val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
136 sample_size = 32;
137 break;
138 default:
139 return -EINVAL;
140 }
141
142 mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
143 val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
144
145 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
146
147 srate = params_rate(params);
148
149
150 i2sclock = srate * params_channels(params) * sample_size * 2;
151
152 ret = clk_set_rate(i2s->clk_i2s, i2sclock);
153 if (ret) {
154 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
155 return ret;
156 }
157
158 bitcnt = (i2sclock / (2 * srate)) - 1;
159 if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
160 return -EINVAL;
161 val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
162
163 if (i2sclock % (2 * srate))
164 val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
165
166 regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
167
168 regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
169 TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
170 TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
171
172 return 0;
173 }
174
175 static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
176 {
177 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
178 TEGRA20_I2S_CTRL_FIFO1_ENABLE,
179 TEGRA20_I2S_CTRL_FIFO1_ENABLE);
180 }
181
182 static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
183 {
184 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
185 TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
186 }
187
188 static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
189 {
190 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
191 TEGRA20_I2S_CTRL_FIFO2_ENABLE,
192 TEGRA20_I2S_CTRL_FIFO2_ENABLE);
193 }
194
195 static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
196 {
197 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
198 TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
199 }
200
201 static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
202 struct snd_soc_dai *dai)
203 {
204 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
205
206 switch (cmd) {
207 case SNDRV_PCM_TRIGGER_START:
208 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
209 case SNDRV_PCM_TRIGGER_RESUME:
210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
211 tegra20_i2s_start_playback(i2s);
212 else
213 tegra20_i2s_start_capture(i2s);
214 break;
215 case SNDRV_PCM_TRIGGER_STOP:
216 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
217 case SNDRV_PCM_TRIGGER_SUSPEND:
218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
219 tegra20_i2s_stop_playback(i2s);
220 else
221 tegra20_i2s_stop_capture(i2s);
222 break;
223 default:
224 return -EINVAL;
225 }
226
227 return 0;
228 }
229
230 static int tegra20_i2s_probe(struct snd_soc_dai *dai)
231 {
232 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
233
234 dai->capture_dma_data = &i2s->capture_dma_data;
235 dai->playback_dma_data = &i2s->playback_dma_data;
236
237 return 0;
238 }
239
240 static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
241 .set_fmt = tegra20_i2s_set_fmt,
242 .hw_params = tegra20_i2s_hw_params,
243 .trigger = tegra20_i2s_trigger,
244 };
245
246 static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
247 .probe = tegra20_i2s_probe,
248 .playback = {
249 .stream_name = "Playback",
250 .channels_min = 2,
251 .channels_max = 2,
252 .rates = SNDRV_PCM_RATE_8000_96000,
253 .formats = SNDRV_PCM_FMTBIT_S16_LE,
254 },
255 .capture = {
256 .stream_name = "Capture",
257 .channels_min = 2,
258 .channels_max = 2,
259 .rates = SNDRV_PCM_RATE_8000_96000,
260 .formats = SNDRV_PCM_FMTBIT_S16_LE,
261 },
262 .ops = &tegra20_i2s_dai_ops,
263 .symmetric_rates = 1,
264 };
265
266 static const struct snd_soc_component_driver tegra20_i2s_component = {
267 .name = DRV_NAME,
268 };
269
270 static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
271 {
272 switch (reg) {
273 case TEGRA20_I2S_CTRL:
274 case TEGRA20_I2S_STATUS:
275 case TEGRA20_I2S_TIMING:
276 case TEGRA20_I2S_FIFO_SCR:
277 case TEGRA20_I2S_PCM_CTRL:
278 case TEGRA20_I2S_NW_CTRL:
279 case TEGRA20_I2S_TDM_CTRL:
280 case TEGRA20_I2S_TDM_TX_RX_CTRL:
281 case TEGRA20_I2S_FIFO1:
282 case TEGRA20_I2S_FIFO2:
283 return true;
284 default:
285 return false;
286 }
287 }
288
289 static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
290 {
291 switch (reg) {
292 case TEGRA20_I2S_STATUS:
293 case TEGRA20_I2S_FIFO_SCR:
294 case TEGRA20_I2S_FIFO1:
295 case TEGRA20_I2S_FIFO2:
296 return true;
297 default:
298 return false;
299 }
300 }
301
302 static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
303 {
304 switch (reg) {
305 case TEGRA20_I2S_FIFO1:
306 case TEGRA20_I2S_FIFO2:
307 return true;
308 default:
309 return false;
310 }
311 }
312
313 static const struct regmap_config tegra20_i2s_regmap_config = {
314 .reg_bits = 32,
315 .reg_stride = 4,
316 .val_bits = 32,
317 .max_register = TEGRA20_I2S_FIFO2,
318 .writeable_reg = tegra20_i2s_wr_rd_reg,
319 .readable_reg = tegra20_i2s_wr_rd_reg,
320 .volatile_reg = tegra20_i2s_volatile_reg,
321 .precious_reg = tegra20_i2s_precious_reg,
322 .cache_type = REGCACHE_FLAT,
323 };
324
325 static int tegra20_i2s_platform_probe(struct platform_device *pdev)
326 {
327 struct tegra20_i2s *i2s;
328 struct resource *mem;
329 void __iomem *regs;
330 int ret;
331
332 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
333 if (!i2s) {
334 ret = -ENOMEM;
335 goto err;
336 }
337 dev_set_drvdata(&pdev->dev, i2s);
338
339 i2s->dai = tegra20_i2s_dai_template;
340 i2s->dai.name = dev_name(&pdev->dev);
341
342 i2s->clk_i2s = clk_get(&pdev->dev, NULL);
343 if (IS_ERR(i2s->clk_i2s)) {
344 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
345 ret = PTR_ERR(i2s->clk_i2s);
346 goto err;
347 }
348
349 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
350 regs = devm_ioremap_resource(&pdev->dev, mem);
351 if (IS_ERR(regs)) {
352 ret = PTR_ERR(regs);
353 goto err_clk_put;
354 }
355
356 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
357 &tegra20_i2s_regmap_config);
358 if (IS_ERR(i2s->regmap)) {
359 dev_err(&pdev->dev, "regmap init failed\n");
360 ret = PTR_ERR(i2s->regmap);
361 goto err_clk_put;
362 }
363
364 i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
365 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
366 i2s->capture_dma_data.maxburst = 4;
367
368 i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
369 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
370 i2s->playback_dma_data.maxburst = 4;
371
372 pm_runtime_enable(&pdev->dev);
373 if (!pm_runtime_enabled(&pdev->dev)) {
374 ret = tegra20_i2s_runtime_resume(&pdev->dev);
375 if (ret)
376 goto err_pm_disable;
377 }
378
379 ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
380 &i2s->dai, 1);
381 if (ret) {
382 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
383 ret = -ENOMEM;
384 goto err_suspend;
385 }
386
387 ret = tegra_pcm_platform_register(&pdev->dev);
388 if (ret) {
389 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
390 goto err_unregister_component;
391 }
392
393 return 0;
394
395 err_unregister_component:
396 snd_soc_unregister_component(&pdev->dev);
397 err_suspend:
398 if (!pm_runtime_status_suspended(&pdev->dev))
399 tegra20_i2s_runtime_suspend(&pdev->dev);
400 err_pm_disable:
401 pm_runtime_disable(&pdev->dev);
402 err_clk_put:
403 clk_put(i2s->clk_i2s);
404 err:
405 return ret;
406 }
407
408 static int tegra20_i2s_platform_remove(struct platform_device *pdev)
409 {
410 struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
411
412 pm_runtime_disable(&pdev->dev);
413 if (!pm_runtime_status_suspended(&pdev->dev))
414 tegra20_i2s_runtime_suspend(&pdev->dev);
415
416 tegra_pcm_platform_unregister(&pdev->dev);
417 snd_soc_unregister_component(&pdev->dev);
418
419 clk_put(i2s->clk_i2s);
420
421 return 0;
422 }
423
424 static const struct of_device_id tegra20_i2s_of_match[] = {
425 { .compatible = "nvidia,tegra20-i2s", },
426 {},
427 };
428
429 static const struct dev_pm_ops tegra20_i2s_pm_ops = {
430 SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
431 tegra20_i2s_runtime_resume, NULL)
432 };
433
434 static struct platform_driver tegra20_i2s_driver = {
435 .driver = {
436 .name = DRV_NAME,
437 .of_match_table = tegra20_i2s_of_match,
438 .pm = &tegra20_i2s_pm_ops,
439 },
440 .probe = tegra20_i2s_platform_probe,
441 .remove = tegra20_i2s_platform_remove,
442 };
443 module_platform_driver(tegra20_i2s_driver);
444
445 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
446 MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
447 MODULE_LICENSE("GPL");
448 MODULE_ALIAS("platform:" DRV_NAME);
449 MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);