1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * tegra20_i2s.c - Tegra20 I2S driver
4 *
5 * Author: Stephen Warren <swarren@nvidia.com>
6 * Copyright (C) 2010,2012 - NVIDIA, Inc.
7 *
8 * Based on code copyright/by:
9 *
10 * Copyright (c) 2009-2010, NVIDIA Corporation.
11 * Scott Peterson <speterson@nvidia.com>
12 *
13 * Copyright (C) 2010 Google, Inc.
14 * Iliyan Malchev <malchev@google.com>
15 */
16
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/reset.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
31 #include <sound/dmaengine_pcm.h>
32
33 #include "tegra20_i2s.h"
34
35 #define DRV_NAME "tegra20-i2s"
36
tegra20_i2s_runtime_suspend(struct device * dev)37 static __maybe_unused int tegra20_i2s_runtime_suspend(struct device *dev)
38 {
39 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
40
41 regcache_cache_only(i2s->regmap, true);
42
43 clk_disable_unprepare(i2s->clk_i2s);
44
45 return 0;
46 }
47
tegra20_i2s_runtime_resume(struct device * dev)48 static __maybe_unused int tegra20_i2s_runtime_resume(struct device *dev)
49 {
50 struct tegra20_i2s *i2s = dev_get_drvdata(dev);
51 int ret;
52
53 ret = reset_control_assert(i2s->reset);
54 if (ret)
55 return ret;
56
57 ret = clk_prepare_enable(i2s->clk_i2s);
58 if (ret) {
59 dev_err(dev, "clk_enable failed: %d\n", ret);
60 return ret;
61 }
62
63 usleep_range(10, 100);
64
65 ret = reset_control_deassert(i2s->reset);
66 if (ret)
67 goto disable_clocks;
68
69 regcache_cache_only(i2s->regmap, false);
70 regcache_mark_dirty(i2s->regmap);
71
72 ret = regcache_sync(i2s->regmap);
73 if (ret)
74 goto disable_clocks;
75
76 return 0;
77
78 disable_clocks:
79 clk_disable_unprepare(i2s->clk_i2s);
80
81 return ret;
82 }
83
tegra20_i2s_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)84 static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
85 unsigned int fmt)
86 {
87 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
88 unsigned int mask = 0, val = 0;
89
90 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
91 case SND_SOC_DAIFMT_NB_NF:
92 break;
93 default:
94 return -EINVAL;
95 }
96
97 mask |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
98 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
99 case SND_SOC_DAIFMT_BP_FP:
100 val |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
101 break;
102 case SND_SOC_DAIFMT_BC_FC:
103 break;
104 default:
105 return -EINVAL;
106 }
107
108 mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
109 TEGRA20_I2S_CTRL_LRCK_MASK;
110 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
111 case SND_SOC_DAIFMT_DSP_A:
112 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
113 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
114 break;
115 case SND_SOC_DAIFMT_DSP_B:
116 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
117 val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
118 break;
119 case SND_SOC_DAIFMT_I2S:
120 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
121 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
122 break;
123 case SND_SOC_DAIFMT_RIGHT_J:
124 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
125 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
126 break;
127 case SND_SOC_DAIFMT_LEFT_J:
128 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
129 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
130 break;
131 default:
132 return -EINVAL;
133 }
134
135 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
136
137 return 0;
138 }
139
tegra20_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)140 static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
141 struct snd_pcm_hw_params *params,
142 struct snd_soc_dai *dai)
143 {
144 struct device *dev = dai->dev;
145 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
146 unsigned int mask, val;
147 int ret, sample_size, srate, i2sclock, bitcnt;
148
149 mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
150 switch (params_format(params)) {
151 case SNDRV_PCM_FORMAT_S16_LE:
152 val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
153 sample_size = 16;
154 break;
155 case SNDRV_PCM_FORMAT_S24_LE:
156 val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
157 sample_size = 24;
158 break;
159 case SNDRV_PCM_FORMAT_S32_LE:
160 val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
161 sample_size = 32;
162 break;
163 default:
164 return -EINVAL;
165 }
166
167 mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
168 val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
169
170 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
171
172 srate = params_rate(params);
173
174 /* Final "* 2" required by Tegra hardware */
175 i2sclock = srate * params_channels(params) * sample_size * 2;
176
177 ret = clk_set_rate(i2s->clk_i2s, i2sclock);
178 if (ret) {
179 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
180 return ret;
181 }
182
183 bitcnt = (i2sclock / (2 * srate)) - 1;
184 if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
185 return -EINVAL;
186 val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
187
188 if (i2sclock % (2 * srate))
189 val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
190
191 regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
192
193 regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
194 TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
195 TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
196
197 return 0;
198 }
199
tegra20_i2s_start_playback(struct tegra20_i2s * i2s)200 static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
201 {
202 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
203 TEGRA20_I2S_CTRL_FIFO1_ENABLE,
204 TEGRA20_I2S_CTRL_FIFO1_ENABLE);
205 }
206
tegra20_i2s_stop_playback(struct tegra20_i2s * i2s)207 static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
208 {
209 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
210 TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
211 }
212
tegra20_i2s_start_capture(struct tegra20_i2s * i2s)213 static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
214 {
215 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
216 TEGRA20_I2S_CTRL_FIFO2_ENABLE,
217 TEGRA20_I2S_CTRL_FIFO2_ENABLE);
218 }
219
tegra20_i2s_stop_capture(struct tegra20_i2s * i2s)220 static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
221 {
222 regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
223 TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
224 }
225
tegra20_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)226 static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
227 struct snd_soc_dai *dai)
228 {
229 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
230
231 switch (cmd) {
232 case SNDRV_PCM_TRIGGER_START:
233 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
234 case SNDRV_PCM_TRIGGER_RESUME:
235 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
236 tegra20_i2s_start_playback(i2s);
237 else
238 tegra20_i2s_start_capture(i2s);
239 break;
240 case SNDRV_PCM_TRIGGER_STOP:
241 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
242 case SNDRV_PCM_TRIGGER_SUSPEND:
243 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
244 tegra20_i2s_stop_playback(i2s);
245 else
246 tegra20_i2s_stop_capture(i2s);
247 break;
248 default:
249 return -EINVAL;
250 }
251
252 return 0;
253 }
254
tegra20_i2s_probe(struct snd_soc_dai * dai)255 static int tegra20_i2s_probe(struct snd_soc_dai *dai)
256 {
257 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
258
259 snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
260 &i2s->capture_dma_data);
261
262 return 0;
263 }
264
265 static const unsigned int tegra20_i2s_rates[] = {
266 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000
267 };
268
tegra20_i2s_filter_rates(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)269 static int tegra20_i2s_filter_rates(struct snd_pcm_hw_params *params,
270 struct snd_pcm_hw_rule *rule)
271 {
272 struct snd_interval *r = hw_param_interval(params, rule->var);
273 struct snd_soc_dai *dai = rule->private;
274 struct tegra20_i2s *i2s = dev_get_drvdata(dai->dev);
275 struct clk *parent = clk_get_parent(i2s->clk_i2s);
276 unsigned long i, parent_rate, valid_rates = 0;
277
278 parent_rate = clk_get_rate(parent);
279 if (!parent_rate) {
280 dev_err(dai->dev, "Can't get parent clock rate\n");
281 return -EINVAL;
282 }
283
284 for (i = 0; i < ARRAY_SIZE(tegra20_i2s_rates); i++) {
285 if (parent_rate % (tegra20_i2s_rates[i] * 128) == 0)
286 valid_rates |= BIT(i);
287 }
288
289 /*
290 * At least one rate must be valid, otherwise the parent clock isn't
291 * audio PLL. Nothing should be filtered in this case.
292 */
293 if (!valid_rates)
294 valid_rates = BIT(ARRAY_SIZE(tegra20_i2s_rates)) - 1;
295
296 return snd_interval_list(r, ARRAY_SIZE(tegra20_i2s_rates),
297 tegra20_i2s_rates, valid_rates);
298 }
299
tegra20_i2s_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)300 static int tegra20_i2s_startup(struct snd_pcm_substream *substream,
301 struct snd_soc_dai *dai)
302 {
303 if (!device_property_read_bool(dai->dev, "nvidia,fixed-parent-rate"))
304 return 0;
305
306 return snd_pcm_hw_rule_add(substream->runtime, 0,
307 SNDRV_PCM_HW_PARAM_RATE,
308 tegra20_i2s_filter_rates, dai,
309 SNDRV_PCM_HW_PARAM_RATE, -1);
310 }
311
312 static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
313 .probe = tegra20_i2s_probe,
314 .set_fmt = tegra20_i2s_set_fmt,
315 .hw_params = tegra20_i2s_hw_params,
316 .trigger = tegra20_i2s_trigger,
317 .startup = tegra20_i2s_startup,
318 };
319
320 static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
321 .playback = {
322 .stream_name = "Playback",
323 .channels_min = 2,
324 .channels_max = 2,
325 .rates = SNDRV_PCM_RATE_8000_96000,
326 .formats = SNDRV_PCM_FMTBIT_S16_LE,
327 },
328 .capture = {
329 .stream_name = "Capture",
330 .channels_min = 2,
331 .channels_max = 2,
332 .rates = SNDRV_PCM_RATE_8000_96000,
333 .formats = SNDRV_PCM_FMTBIT_S16_LE,
334 },
335 .ops = &tegra20_i2s_dai_ops,
336 .symmetric_rate = 1,
337 };
338
339 static const struct snd_soc_component_driver tegra20_i2s_component = {
340 .name = DRV_NAME,
341 .legacy_dai_naming = 1,
342 };
343
tegra20_i2s_wr_rd_reg(struct device * dev,unsigned int reg)344 static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
345 {
346 switch (reg) {
347 case TEGRA20_I2S_CTRL:
348 case TEGRA20_I2S_STATUS:
349 case TEGRA20_I2S_TIMING:
350 case TEGRA20_I2S_FIFO_SCR:
351 case TEGRA20_I2S_PCM_CTRL:
352 case TEGRA20_I2S_NW_CTRL:
353 case TEGRA20_I2S_TDM_CTRL:
354 case TEGRA20_I2S_TDM_TX_RX_CTRL:
355 case TEGRA20_I2S_FIFO1:
356 case TEGRA20_I2S_FIFO2:
357 return true;
358 default:
359 return false;
360 }
361 }
362
tegra20_i2s_volatile_reg(struct device * dev,unsigned int reg)363 static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
364 {
365 switch (reg) {
366 case TEGRA20_I2S_STATUS:
367 case TEGRA20_I2S_FIFO_SCR:
368 case TEGRA20_I2S_FIFO1:
369 case TEGRA20_I2S_FIFO2:
370 return true;
371 default:
372 return false;
373 }
374 }
375
tegra20_i2s_precious_reg(struct device * dev,unsigned int reg)376 static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
377 {
378 switch (reg) {
379 case TEGRA20_I2S_FIFO1:
380 case TEGRA20_I2S_FIFO2:
381 return true;
382 default:
383 return false;
384 }
385 }
386
387 static const struct regmap_config tegra20_i2s_regmap_config = {
388 .reg_bits = 32,
389 .reg_stride = 4,
390 .val_bits = 32,
391 .max_register = TEGRA20_I2S_FIFO2,
392 .writeable_reg = tegra20_i2s_wr_rd_reg,
393 .readable_reg = tegra20_i2s_wr_rd_reg,
394 .volatile_reg = tegra20_i2s_volatile_reg,
395 .precious_reg = tegra20_i2s_precious_reg,
396 .cache_type = REGCACHE_FLAT,
397 };
398
tegra20_i2s_platform_probe(struct platform_device * pdev)399 static int tegra20_i2s_platform_probe(struct platform_device *pdev)
400 {
401 struct tegra20_i2s *i2s;
402 struct resource *mem;
403 void __iomem *regs;
404 int ret;
405
406 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
407 if (!i2s) {
408 ret = -ENOMEM;
409 goto err;
410 }
411 dev_set_drvdata(&pdev->dev, i2s);
412
413 i2s->dai = tegra20_i2s_dai_template;
414 i2s->dai.name = dev_name(&pdev->dev);
415
416 i2s->reset = devm_reset_control_get_exclusive(&pdev->dev, "i2s");
417 if (IS_ERR(i2s->reset)) {
418 dev_err(&pdev->dev, "Can't retrieve i2s reset\n");
419 return PTR_ERR(i2s->reset);
420 }
421
422 i2s->clk_i2s = devm_clk_get(&pdev->dev, NULL);
423 if (IS_ERR(i2s->clk_i2s)) {
424 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
425 ret = PTR_ERR(i2s->clk_i2s);
426 goto err;
427 }
428
429 regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
430 if (IS_ERR(regs)) {
431 ret = PTR_ERR(regs);
432 goto err;
433 }
434
435 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
436 &tegra20_i2s_regmap_config);
437 if (IS_ERR(i2s->regmap)) {
438 dev_err(&pdev->dev, "regmap init failed\n");
439 ret = PTR_ERR(i2s->regmap);
440 goto err;
441 }
442
443 i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
444 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
445 i2s->capture_dma_data.maxburst = 4;
446
447 i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
448 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
449 i2s->playback_dma_data.maxburst = 4;
450
451 pm_runtime_enable(&pdev->dev);
452
453 ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
454 &i2s->dai, 1);
455 if (ret) {
456 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
457 ret = -ENOMEM;
458 goto err_pm_disable;
459 }
460
461 ret = tegra_pcm_platform_register(&pdev->dev);
462 if (ret) {
463 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
464 goto err_unregister_component;
465 }
466
467 return 0;
468
469 err_unregister_component:
470 snd_soc_unregister_component(&pdev->dev);
471 err_pm_disable:
472 pm_runtime_disable(&pdev->dev);
473 err:
474 return ret;
475 }
476
tegra20_i2s_platform_remove(struct platform_device * pdev)477 static void tegra20_i2s_platform_remove(struct platform_device *pdev)
478 {
479 tegra_pcm_platform_unregister(&pdev->dev);
480 snd_soc_unregister_component(&pdev->dev);
481 pm_runtime_disable(&pdev->dev);
482 }
483
484 static const struct of_device_id tegra20_i2s_of_match[] = {
485 { .compatible = "nvidia,tegra20-i2s", },
486 {},
487 };
488
489 static const struct dev_pm_ops tegra20_i2s_pm_ops = {
490 SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
491 tegra20_i2s_runtime_resume, NULL)
492 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
493 pm_runtime_force_resume)
494 };
495
496 static struct platform_driver tegra20_i2s_driver = {
497 .driver = {
498 .name = DRV_NAME,
499 .of_match_table = tegra20_i2s_of_match,
500 .pm = &tegra20_i2s_pm_ops,
501 },
502 .probe = tegra20_i2s_platform_probe,
503 .remove_new = tegra20_i2s_platform_remove,
504 };
505 module_platform_driver(tegra20_i2s_driver);
506
507 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
508 MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
509 MODULE_LICENSE("GPL");
510 MODULE_ALIAS("platform:" DRV_NAME);
511 MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);
512