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31#include <linux/clk.h>
32#include <linux/device.h>
33#include <linux/io.h>
34#include <linux/module.h>
35#include <linux/of.h>
36#include <linux/platform_device.h>
37#include <linux/pm_runtime.h>
38#include <linux/regmap.h>
39#include <linux/slab.h>
40#include <sound/core.h>
41#include <sound/pcm.h>
42#include <sound/pcm_params.h>
43#include <sound/soc.h>
44#include <sound/dmaengine_pcm.h>
45
46#include "tegra20_i2s.h"
47
48#define DRV_NAME "tegra20-i2s"
49
50static int tegra20_i2s_runtime_suspend(struct device *dev)
51{
52 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
53
54 clk_disable_unprepare(i2s->clk_i2s);
55
56 return 0;
57}
58
59static int tegra20_i2s_runtime_resume(struct device *dev)
60{
61 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
62 int ret;
63
64 ret = clk_prepare_enable(i2s->clk_i2s);
65 if (ret) {
66 dev_err(dev, "clk_enable failed: %d\n", ret);
67 return ret;
68 }
69
70 return 0;
71}
72
73static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
74 unsigned int fmt)
75{
76 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
77 unsigned int mask, val;
78
79 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
80 case SND_SOC_DAIFMT_NB_NF:
81 break;
82 default:
83 return -EINVAL;
84 }
85
86 mask = TEGRA20_I2S_CTRL_MASTER_ENABLE;
87 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
88 case SND_SOC_DAIFMT_CBS_CFS:
89 val = TEGRA20_I2S_CTRL_MASTER_ENABLE;
90 break;
91 case SND_SOC_DAIFMT_CBM_CFM:
92 break;
93 default:
94 return -EINVAL;
95 }
96
97 mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
98 TEGRA20_I2S_CTRL_LRCK_MASK;
99 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
100 case SND_SOC_DAIFMT_DSP_A:
101 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
102 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
103 break;
104 case SND_SOC_DAIFMT_DSP_B:
105 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
106 val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
107 break;
108 case SND_SOC_DAIFMT_I2S:
109 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
110 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
111 break;
112 case SND_SOC_DAIFMT_RIGHT_J:
113 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
114 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
115 break;
116 case SND_SOC_DAIFMT_LEFT_J:
117 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
118 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
125
126 return 0;
127}
128
129static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
130 struct snd_pcm_hw_params *params,
131 struct snd_soc_dai *dai)
132{
133 struct device *dev = dai->dev;
134 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
135 unsigned int mask, val;
136 int ret, sample_size, srate, i2sclock, bitcnt;
137
138 mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
139 switch (params_format(params)) {
140 case SNDRV_PCM_FORMAT_S16_LE:
141 val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
142 sample_size = 16;
143 break;
144 case SNDRV_PCM_FORMAT_S24_LE:
145 val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
146 sample_size = 24;
147 break;
148 case SNDRV_PCM_FORMAT_S32_LE:
149 val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
150 sample_size = 32;
151 break;
152 default:
153 return -EINVAL;
154 }
155
156 mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
157 val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
158
159 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
160
161 srate = params_rate(params);
162
163
164 i2sclock = srate * params_channels(params) * sample_size * 2;
165
166 ret = clk_set_rate(i2s->clk_i2s, i2sclock);
167 if (ret) {
168 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
169 return ret;
170 }
171
172 bitcnt = (i2sclock / (2 * srate)) - 1;
173 if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
174 return -EINVAL;
175 val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
176
177 if (i2sclock % (2 * srate))
178 val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
179
180 regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
181
182 regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
183 TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
184 TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
185
186 return 0;
187}
188
189static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
190{
191 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
192 TEGRA20_I2S_CTRL_FIFO1_ENABLE,
193 TEGRA20_I2S_CTRL_FIFO1_ENABLE);
194}
195
196static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
197{
198 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
199 TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
200}
201
202static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
203{
204 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
205 TEGRA20_I2S_CTRL_FIFO2_ENABLE,
206 TEGRA20_I2S_CTRL_FIFO2_ENABLE);
207}
208
209static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
210{
211 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
212 TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
213}
214
215static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
216 struct snd_soc_dai *dai)
217{
218 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
219
220 switch (cmd) {
221 case SNDRV_PCM_TRIGGER_START:
222 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
223 case SNDRV_PCM_TRIGGER_RESUME:
224 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
225 tegra20_i2s_start_playback(i2s);
226 else
227 tegra20_i2s_start_capture(i2s);
228 break;
229 case SNDRV_PCM_TRIGGER_STOP:
230 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
231 case SNDRV_PCM_TRIGGER_SUSPEND:
232 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
233 tegra20_i2s_stop_playback(i2s);
234 else
235 tegra20_i2s_stop_capture(i2s);
236 break;
237 default:
238 return -EINVAL;
239 }
240
241 return 0;
242}
243
244static int tegra20_i2s_probe(struct snd_soc_dai *dai)
245{
246 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
247
248 dai->capture_dma_data = &i2s->capture_dma_data;
249 dai->playback_dma_data = &i2s->playback_dma_data;
250
251 return 0;
252}
253
254static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
255 .set_fmt = tegra20_i2s_set_fmt,
256 .hw_params = tegra20_i2s_hw_params,
257 .trigger = tegra20_i2s_trigger,
258};
259
260static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
261 .probe = tegra20_i2s_probe,
262 .playback = {
263 .stream_name = "Playback",
264 .channels_min = 2,
265 .channels_max = 2,
266 .rates = SNDRV_PCM_RATE_8000_96000,
267 .formats = SNDRV_PCM_FMTBIT_S16_LE,
268 },
269 .capture = {
270 .stream_name = "Capture",
271 .channels_min = 2,
272 .channels_max = 2,
273 .rates = SNDRV_PCM_RATE_8000_96000,
274 .formats = SNDRV_PCM_FMTBIT_S16_LE,
275 },
276 .ops = &tegra20_i2s_dai_ops,
277 .symmetric_rates = 1,
278};
279
280static const struct snd_soc_component_driver tegra20_i2s_component = {
281 .name = DRV_NAME,
282};
283
284static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
285{
286 switch (reg) {
287 case TEGRA20_I2S_CTRL:
288 case TEGRA20_I2S_STATUS:
289 case TEGRA20_I2S_TIMING:
290 case TEGRA20_I2S_FIFO_SCR:
291 case TEGRA20_I2S_PCM_CTRL:
292 case TEGRA20_I2S_NW_CTRL:
293 case TEGRA20_I2S_TDM_CTRL:
294 case TEGRA20_I2S_TDM_TX_RX_CTRL:
295 case TEGRA20_I2S_FIFO1:
296 case TEGRA20_I2S_FIFO2:
297 return true;
298 default:
299 return false;
300 };
301}
302
303static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
304{
305 switch (reg) {
306 case TEGRA20_I2S_STATUS:
307 case TEGRA20_I2S_FIFO_SCR:
308 case TEGRA20_I2S_FIFO1:
309 case TEGRA20_I2S_FIFO2:
310 return true;
311 default:
312 return false;
313 };
314}
315
316static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
317{
318 switch (reg) {
319 case TEGRA20_I2S_FIFO1:
320 case TEGRA20_I2S_FIFO2:
321 return true;
322 default:
323 return false;
324 };
325}
326
327static const struct regmap_config tegra20_i2s_regmap_config = {
328 .reg_bits = 32,
329 .reg_stride = 4,
330 .val_bits = 32,
331 .max_register = TEGRA20_I2S_FIFO2,
332 .writeable_reg = tegra20_i2s_wr_rd_reg,
333 .readable_reg = tegra20_i2s_wr_rd_reg,
334 .volatile_reg = tegra20_i2s_volatile_reg,
335 .precious_reg = tegra20_i2s_precious_reg,
336 .cache_type = REGCACHE_RBTREE,
337};
338
339static int tegra20_i2s_platform_probe(struct platform_device *pdev)
340{
341 struct tegra20_i2s *i2s;
342 struct resource *mem, *memregion, *dmareq;
343 u32 of_dma[2];
344 u32 dma_ch;
345 void __iomem *regs;
346 int ret;
347
348 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
349 if (!i2s) {
350 dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
351 ret = -ENOMEM;
352 goto err;
353 }
354 dev_set_drvdata(&pdev->dev, i2s);
355
356 i2s->dai = tegra20_i2s_dai_template;
357 i2s->dai.name = dev_name(&pdev->dev);
358
359 i2s->clk_i2s = clk_get(&pdev->dev, NULL);
360 if (IS_ERR(i2s->clk_i2s)) {
361 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
362 ret = PTR_ERR(i2s->clk_i2s);
363 goto err;
364 }
365
366 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
367 if (!mem) {
368 dev_err(&pdev->dev, "No memory resource\n");
369 ret = -ENODEV;
370 goto err_clk_put;
371 }
372
373 dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
374 if (!dmareq) {
375 if (of_property_read_u32_array(pdev->dev.of_node,
376 "nvidia,dma-request-selector",
377 of_dma, 2) < 0) {
378 dev_err(&pdev->dev, "No DMA resource\n");
379 ret = -ENODEV;
380 goto err_clk_put;
381 }
382 dma_ch = of_dma[1];
383 } else {
384 dma_ch = dmareq->start;
385 }
386
387 memregion = devm_request_mem_region(&pdev->dev, mem->start,
388 resource_size(mem), DRV_NAME);
389 if (!memregion) {
390 dev_err(&pdev->dev, "Memory region already claimed\n");
391 ret = -EBUSY;
392 goto err_clk_put;
393 }
394
395 regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
396 if (!regs) {
397 dev_err(&pdev->dev, "ioremap failed\n");
398 ret = -ENOMEM;
399 goto err_clk_put;
400 }
401
402 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
403 &tegra20_i2s_regmap_config);
404 if (IS_ERR(i2s->regmap)) {
405 dev_err(&pdev->dev, "regmap init failed\n");
406 ret = PTR_ERR(i2s->regmap);
407 goto err_clk_put;
408 }
409
410 i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
411 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
412 i2s->capture_dma_data.maxburst = 4;
413 i2s->capture_dma_data.slave_id = dma_ch;
414
415 i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
416 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
417 i2s->playback_dma_data.maxburst = 4;
418 i2s->playback_dma_data.slave_id = dma_ch;
419
420 pm_runtime_enable(&pdev->dev);
421 if (!pm_runtime_enabled(&pdev->dev)) {
422 ret = tegra20_i2s_runtime_resume(&pdev->dev);
423 if (ret)
424 goto err_pm_disable;
425 }
426
427 ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
428 &i2s->dai, 1);
429 if (ret) {
430 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
431 ret = -ENOMEM;
432 goto err_suspend;
433 }
434
435 ret = tegra_pcm_platform_register(&pdev->dev);
436 if (ret) {
437 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
438 goto err_unregister_component;
439 }
440
441 return 0;
442
443err_unregister_component:
444 snd_soc_unregister_component(&pdev->dev);
445err_suspend:
446 if (!pm_runtime_status_suspended(&pdev->dev))
447 tegra20_i2s_runtime_suspend(&pdev->dev);
448err_pm_disable:
449 pm_runtime_disable(&pdev->dev);
450err_clk_put:
451 clk_put(i2s->clk_i2s);
452err:
453 return ret;
454}
455
456static int tegra20_i2s_platform_remove(struct platform_device *pdev)
457{
458 struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
459
460 pm_runtime_disable(&pdev->dev);
461 if (!pm_runtime_status_suspended(&pdev->dev))
462 tegra20_i2s_runtime_suspend(&pdev->dev);
463
464 tegra_pcm_platform_unregister(&pdev->dev);
465 snd_soc_unregister_component(&pdev->dev);
466
467 clk_put(i2s->clk_i2s);
468
469 return 0;
470}
471
472static const struct of_device_id tegra20_i2s_of_match[] = {
473 { .compatible = "nvidia,tegra20-i2s", },
474 {},
475};
476
477static const struct dev_pm_ops tegra20_i2s_pm_ops = {
478 SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
479 tegra20_i2s_runtime_resume, NULL)
480};
481
482static struct platform_driver tegra20_i2s_driver = {
483 .driver = {
484 .name = DRV_NAME,
485 .owner = THIS_MODULE,
486 .of_match_table = tegra20_i2s_of_match,
487 .pm = &tegra20_i2s_pm_ops,
488 },
489 .probe = tegra20_i2s_platform_probe,
490 .remove = tegra20_i2s_platform_remove,
491};
492module_platform_driver(tegra20_i2s_driver);
493
494MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
495MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
496MODULE_LICENSE("GPL");
497MODULE_ALIAS("platform:" DRV_NAME);
498MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);
499
