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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
37static __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
48static __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
78disable_clocks:
79 clk_disable_unprepare(i2s->clk_i2s);
80
81 return ret;
82}
83
84static 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
140static 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
200static 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
207static 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
213static 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
220static 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
226static 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
255static int tegra20_i2s_probe(struct snd_soc_dai *dai)
256{
257 struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
258
259 dai->capture_dma_data = &i2s->capture_dma_data;
260 dai->playback_dma_data = &i2s->playback_dma_data;
261
262 return 0;
263}
264
265static const unsigned int tegra20_i2s_rates[] = {
266 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000
267};
268
269static 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 long i, parent_rate, valid_rates = 0;
277
278 parent_rate = clk_get_rate(parent);
279 if (parent_rate <= 0) {
280 dev_err(dai->dev, "Can't get parent clock rate: %ld\n",
281 parent_rate);
282 return parent_rate ?: -EINVAL;
283 }
284
285 for (i = 0; i < ARRAY_SIZE(tegra20_i2s_rates); i++) {
286 if (parent_rate % (tegra20_i2s_rates[i] * 128) == 0)
287 valid_rates |= BIT(i);
288 }
289
290 /*
291 * At least one rate must be valid, otherwise the parent clock isn't
292 * audio PLL. Nothing should be filtered in this case.
293 */
294 if (!valid_rates)
295 valid_rates = BIT(ARRAY_SIZE(tegra20_i2s_rates)) - 1;
296
297 return snd_interval_list(r, ARRAY_SIZE(tegra20_i2s_rates),
298 tegra20_i2s_rates, valid_rates);
299}
300
301static int tegra20_i2s_startup(struct snd_pcm_substream *substream,
302 struct snd_soc_dai *dai)
303{
304 if (!device_property_read_bool(dai->dev, "nvidia,fixed-parent-rate"))
305 return 0;
306
307 return snd_pcm_hw_rule_add(substream->runtime, 0,
308 SNDRV_PCM_HW_PARAM_RATE,
309 tegra20_i2s_filter_rates, dai,
310 SNDRV_PCM_HW_PARAM_RATE, -1);
311}
312
313static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
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
320static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
321 .probe = tegra20_i2s_probe,
322 .playback = {
323 .stream_name = "Playback",
324 .channels_min = 2,
325 .channels_max = 2,
326 .rates = SNDRV_PCM_RATE_8000_96000,
327 .formats = SNDRV_PCM_FMTBIT_S16_LE,
328 },
329 .capture = {
330 .stream_name = "Capture",
331 .channels_min = 2,
332 .channels_max = 2,
333 .rates = SNDRV_PCM_RATE_8000_96000,
334 .formats = SNDRV_PCM_FMTBIT_S16_LE,
335 },
336 .ops = &tegra20_i2s_dai_ops,
337 .symmetric_rate = 1,
338};
339
340static const struct snd_soc_component_driver tegra20_i2s_component = {
341 .name = DRV_NAME,
342 .legacy_dai_naming = 1,
343};
344
345static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
346{
347 switch (reg) {
348 case TEGRA20_I2S_CTRL:
349 case TEGRA20_I2S_STATUS:
350 case TEGRA20_I2S_TIMING:
351 case TEGRA20_I2S_FIFO_SCR:
352 case TEGRA20_I2S_PCM_CTRL:
353 case TEGRA20_I2S_NW_CTRL:
354 case TEGRA20_I2S_TDM_CTRL:
355 case TEGRA20_I2S_TDM_TX_RX_CTRL:
356 case TEGRA20_I2S_FIFO1:
357 case TEGRA20_I2S_FIFO2:
358 return true;
359 default:
360 return false;
361 }
362}
363
364static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
365{
366 switch (reg) {
367 case TEGRA20_I2S_STATUS:
368 case TEGRA20_I2S_FIFO_SCR:
369 case TEGRA20_I2S_FIFO1:
370 case TEGRA20_I2S_FIFO2:
371 return true;
372 default:
373 return false;
374 }
375}
376
377static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
378{
379 switch (reg) {
380 case TEGRA20_I2S_FIFO1:
381 case TEGRA20_I2S_FIFO2:
382 return true;
383 default:
384 return false;
385 }
386}
387
388static const struct regmap_config tegra20_i2s_regmap_config = {
389 .reg_bits = 32,
390 .reg_stride = 4,
391 .val_bits = 32,
392 .max_register = TEGRA20_I2S_FIFO2,
393 .writeable_reg = tegra20_i2s_wr_rd_reg,
394 .readable_reg = tegra20_i2s_wr_rd_reg,
395 .volatile_reg = tegra20_i2s_volatile_reg,
396 .precious_reg = tegra20_i2s_precious_reg,
397 .cache_type = REGCACHE_FLAT,
398};
399
400static int tegra20_i2s_platform_probe(struct platform_device *pdev)
401{
402 struct tegra20_i2s *i2s;
403 struct resource *mem;
404 void __iomem *regs;
405 int ret;
406
407 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
408 if (!i2s) {
409 ret = -ENOMEM;
410 goto err;
411 }
412 dev_set_drvdata(&pdev->dev, i2s);
413
414 i2s->dai = tegra20_i2s_dai_template;
415 i2s->dai.name = dev_name(&pdev->dev);
416
417 i2s->reset = devm_reset_control_get_exclusive(&pdev->dev, "i2s");
418 if (IS_ERR(i2s->reset)) {
419 dev_err(&pdev->dev, "Can't retrieve i2s reset\n");
420 return PTR_ERR(i2s->reset);
421 }
422
423 i2s->clk_i2s = devm_clk_get(&pdev->dev, NULL);
424 if (IS_ERR(i2s->clk_i2s)) {
425 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
426 ret = PTR_ERR(i2s->clk_i2s);
427 goto err;
428 }
429
430 regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
431 if (IS_ERR(regs)) {
432 ret = PTR_ERR(regs);
433 goto err;
434 }
435
436 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
437 &tegra20_i2s_regmap_config);
438 if (IS_ERR(i2s->regmap)) {
439 dev_err(&pdev->dev, "regmap init failed\n");
440 ret = PTR_ERR(i2s->regmap);
441 goto err;
442 }
443
444 i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
445 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
446 i2s->capture_dma_data.maxburst = 4;
447
448 i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
449 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
450 i2s->playback_dma_data.maxburst = 4;
451
452 pm_runtime_enable(&pdev->dev);
453
454 ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
455 &i2s->dai, 1);
456 if (ret) {
457 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
458 ret = -ENOMEM;
459 goto err_pm_disable;
460 }
461
462 ret = tegra_pcm_platform_register(&pdev->dev);
463 if (ret) {
464 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
465 goto err_unregister_component;
466 }
467
468 return 0;
469
470err_unregister_component:
471 snd_soc_unregister_component(&pdev->dev);
472err_pm_disable:
473 pm_runtime_disable(&pdev->dev);
474err:
475 return ret;
476}
477
478static int tegra20_i2s_platform_remove(struct platform_device *pdev)
479{
480 tegra_pcm_platform_unregister(&pdev->dev);
481 snd_soc_unregister_component(&pdev->dev);
482 pm_runtime_disable(&pdev->dev);
483
484 return 0;
485}
486
487static const struct of_device_id tegra20_i2s_of_match[] = {
488 { .compatible = "nvidia,tegra20-i2s", },
489 {},
490};
491
492static const struct dev_pm_ops tegra20_i2s_pm_ops = {
493 SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
494 tegra20_i2s_runtime_resume, NULL)
495 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
496 pm_runtime_force_resume)
497};
498
499static struct platform_driver tegra20_i2s_driver = {
500 .driver = {
501 .name = DRV_NAME,
502 .of_match_table = tegra20_i2s_of_match,
503 .pm = &tegra20_i2s_pm_ops,
504 },
505 .probe = tegra20_i2s_platform_probe,
506 .remove = tegra20_i2s_platform_remove,
507};
508module_platform_driver(tegra20_i2s_driver);
509
510MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
511MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
512MODULE_LICENSE("GPL");
513MODULE_ALIAS("platform:" DRV_NAME);
514MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);
1/*
2 * tegra20_i2s.c - Tegra20 I2S driver
3 *
4 * Author: Stephen Warren <swarren@nvidia.com>
5 * Copyright (C) 2010,2012 - NVIDIA, Inc.
6 *
7 * Based on code copyright/by:
8 *
9 * Copyright (c) 2009-2010, NVIDIA Corporation.
10 * Scott Peterson <speterson@nvidia.com>
11 *
12 * Copyright (C) 2010 Google, Inc.
13 * Iliyan Malchev <malchev@google.com>
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * version 2 as published by the Free Software Foundation.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
27 * 02110-1301 USA
28 *
29 */
30
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 = 0, val = 0;
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 /* Final "* 2" required by Tegra hardware */
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_FLAT,
337};
338
339static int tegra20_i2s_platform_probe(struct platform_device *pdev)
340{
341 struct tegra20_i2s *i2s;
342 struct resource *mem;
343 void __iomem *regs;
344 int ret;
345
346 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
347 if (!i2s) {
348 dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
349 ret = -ENOMEM;
350 goto err;
351 }
352 dev_set_drvdata(&pdev->dev, i2s);
353
354 i2s->dai = tegra20_i2s_dai_template;
355 i2s->dai.name = dev_name(&pdev->dev);
356
357 i2s->clk_i2s = clk_get(&pdev->dev, NULL);
358 if (IS_ERR(i2s->clk_i2s)) {
359 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
360 ret = PTR_ERR(i2s->clk_i2s);
361 goto err;
362 }
363
364 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
365 regs = devm_ioremap_resource(&pdev->dev, mem);
366 if (IS_ERR(regs)) {
367 ret = PTR_ERR(regs);
368 goto err_clk_put;
369 }
370
371 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
372 &tegra20_i2s_regmap_config);
373 if (IS_ERR(i2s->regmap)) {
374 dev_err(&pdev->dev, "regmap init failed\n");
375 ret = PTR_ERR(i2s->regmap);
376 goto err_clk_put;
377 }
378
379 i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
380 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
381 i2s->capture_dma_data.maxburst = 4;
382
383 i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
384 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
385 i2s->playback_dma_data.maxburst = 4;
386
387 pm_runtime_enable(&pdev->dev);
388 if (!pm_runtime_enabled(&pdev->dev)) {
389 ret = tegra20_i2s_runtime_resume(&pdev->dev);
390 if (ret)
391 goto err_pm_disable;
392 }
393
394 ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
395 &i2s->dai, 1);
396 if (ret) {
397 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
398 ret = -ENOMEM;
399 goto err_suspend;
400 }
401
402 ret = tegra_pcm_platform_register(&pdev->dev);
403 if (ret) {
404 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
405 goto err_unregister_component;
406 }
407
408 return 0;
409
410err_unregister_component:
411 snd_soc_unregister_component(&pdev->dev);
412err_suspend:
413 if (!pm_runtime_status_suspended(&pdev->dev))
414 tegra20_i2s_runtime_suspend(&pdev->dev);
415err_pm_disable:
416 pm_runtime_disable(&pdev->dev);
417err_clk_put:
418 clk_put(i2s->clk_i2s);
419err:
420 return ret;
421}
422
423static int tegra20_i2s_platform_remove(struct platform_device *pdev)
424{
425 struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
426
427 pm_runtime_disable(&pdev->dev);
428 if (!pm_runtime_status_suspended(&pdev->dev))
429 tegra20_i2s_runtime_suspend(&pdev->dev);
430
431 tegra_pcm_platform_unregister(&pdev->dev);
432 snd_soc_unregister_component(&pdev->dev);
433
434 clk_put(i2s->clk_i2s);
435
436 return 0;
437}
438
439static const struct of_device_id tegra20_i2s_of_match[] = {
440 { .compatible = "nvidia,tegra20-i2s", },
441 {},
442};
443
444static const struct dev_pm_ops tegra20_i2s_pm_ops = {
445 SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
446 tegra20_i2s_runtime_resume, NULL)
447};
448
449static struct platform_driver tegra20_i2s_driver = {
450 .driver = {
451 .name = DRV_NAME,
452 .of_match_table = tegra20_i2s_of_match,
453 .pm = &tegra20_i2s_pm_ops,
454 },
455 .probe = tegra20_i2s_platform_probe,
456 .remove = tegra20_i2s_platform_remove,
457};
458module_platform_driver(tegra20_i2s_driver);
459
460MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
461MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
462MODULE_LICENSE("GPL");
463MODULE_ALIAS("platform:" DRV_NAME);
464MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);