1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * tegra20_spdif.c - Tegra20 SPDIF driver
4 *
5 * Author: Stephen Warren <swarren@nvidia.com>
6 * Copyright (C) 2011-2012 - NVIDIA, Inc.
7 */
8
9 #include <linux/clk.h>
10 #include <linux/device.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <sound/dmaengine_pcm.h>
22
23 #include "tegra20_spdif.h"
24
25 #define DRV_NAME "tegra20-spdif"
26
tegra20_spdif_runtime_suspend(struct device * dev)27 static int tegra20_spdif_runtime_suspend(struct device *dev)
28 {
29 struct tegra20_spdif *spdif = dev_get_drvdata(dev);
30
31 clk_disable_unprepare(spdif->clk_spdif_out);
32
33 return 0;
34 }
35
tegra20_spdif_runtime_resume(struct device * dev)36 static int tegra20_spdif_runtime_resume(struct device *dev)
37 {
38 struct tegra20_spdif *spdif = dev_get_drvdata(dev);
39 int ret;
40
41 ret = clk_prepare_enable(spdif->clk_spdif_out);
42 if (ret) {
43 dev_err(dev, "clk_enable failed: %d\n", ret);
44 return ret;
45 }
46
47 return 0;
48 }
49
tegra20_spdif_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)50 static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
51 struct snd_pcm_hw_params *params,
52 struct snd_soc_dai *dai)
53 {
54 struct device *dev = dai->dev;
55 struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
56 unsigned int mask = 0, val = 0;
57 int ret, spdifclock;
58
59 mask |= TEGRA20_SPDIF_CTRL_PACK |
60 TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
61 switch (params_format(params)) {
62 case SNDRV_PCM_FORMAT_S16_LE:
63 val |= TEGRA20_SPDIF_CTRL_PACK |
64 TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val);
71
72 switch (params_rate(params)) {
73 case 32000:
74 spdifclock = 4096000;
75 break;
76 case 44100:
77 spdifclock = 5644800;
78 break;
79 case 48000:
80 spdifclock = 6144000;
81 break;
82 case 88200:
83 spdifclock = 11289600;
84 break;
85 case 96000:
86 spdifclock = 12288000;
87 break;
88 case 176400:
89 spdifclock = 22579200;
90 break;
91 case 192000:
92 spdifclock = 24576000;
93 break;
94 default:
95 return -EINVAL;
96 }
97
98 ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
99 if (ret) {
100 dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
101 return ret;
102 }
103
104 return 0;
105 }
106
tegra20_spdif_start_playback(struct tegra20_spdif * spdif)107 static void tegra20_spdif_start_playback(struct tegra20_spdif *spdif)
108 {
109 regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
110 TEGRA20_SPDIF_CTRL_TX_EN,
111 TEGRA20_SPDIF_CTRL_TX_EN);
112 }
113
tegra20_spdif_stop_playback(struct tegra20_spdif * spdif)114 static void tegra20_spdif_stop_playback(struct tegra20_spdif *spdif)
115 {
116 regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
117 TEGRA20_SPDIF_CTRL_TX_EN, 0);
118 }
119
tegra20_spdif_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)120 static int tegra20_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
121 struct snd_soc_dai *dai)
122 {
123 struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
124
125 switch (cmd) {
126 case SNDRV_PCM_TRIGGER_START:
127 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
128 case SNDRV_PCM_TRIGGER_RESUME:
129 tegra20_spdif_start_playback(spdif);
130 break;
131 case SNDRV_PCM_TRIGGER_STOP:
132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
133 case SNDRV_PCM_TRIGGER_SUSPEND:
134 tegra20_spdif_stop_playback(spdif);
135 break;
136 default:
137 return -EINVAL;
138 }
139
140 return 0;
141 }
142
tegra20_spdif_probe(struct snd_soc_dai * dai)143 static int tegra20_spdif_probe(struct snd_soc_dai *dai)
144 {
145 struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
146
147 dai->capture_dma_data = NULL;
148 dai->playback_dma_data = &spdif->playback_dma_data;
149
150 return 0;
151 }
152
153 static const struct snd_soc_dai_ops tegra20_spdif_dai_ops = {
154 .hw_params = tegra20_spdif_hw_params,
155 .trigger = tegra20_spdif_trigger,
156 };
157
158 static struct snd_soc_dai_driver tegra20_spdif_dai = {
159 .name = DRV_NAME,
160 .probe = tegra20_spdif_probe,
161 .playback = {
162 .stream_name = "Playback",
163 .channels_min = 2,
164 .channels_max = 2,
165 .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
166 SNDRV_PCM_RATE_48000,
167 .formats = SNDRV_PCM_FMTBIT_S16_LE,
168 },
169 .ops = &tegra20_spdif_dai_ops,
170 };
171
172 static const struct snd_soc_component_driver tegra20_spdif_component = {
173 .name = DRV_NAME,
174 };
175
tegra20_spdif_wr_rd_reg(struct device * dev,unsigned int reg)176 static bool tegra20_spdif_wr_rd_reg(struct device *dev, unsigned int reg)
177 {
178 switch (reg) {
179 case TEGRA20_SPDIF_CTRL:
180 case TEGRA20_SPDIF_STATUS:
181 case TEGRA20_SPDIF_STROBE_CTRL:
182 case TEGRA20_SPDIF_DATA_FIFO_CSR:
183 case TEGRA20_SPDIF_DATA_OUT:
184 case TEGRA20_SPDIF_DATA_IN:
185 case TEGRA20_SPDIF_CH_STA_RX_A:
186 case TEGRA20_SPDIF_CH_STA_RX_B:
187 case TEGRA20_SPDIF_CH_STA_RX_C:
188 case TEGRA20_SPDIF_CH_STA_RX_D:
189 case TEGRA20_SPDIF_CH_STA_RX_E:
190 case TEGRA20_SPDIF_CH_STA_RX_F:
191 case TEGRA20_SPDIF_CH_STA_TX_A:
192 case TEGRA20_SPDIF_CH_STA_TX_B:
193 case TEGRA20_SPDIF_CH_STA_TX_C:
194 case TEGRA20_SPDIF_CH_STA_TX_D:
195 case TEGRA20_SPDIF_CH_STA_TX_E:
196 case TEGRA20_SPDIF_CH_STA_TX_F:
197 case TEGRA20_SPDIF_USR_STA_RX_A:
198 case TEGRA20_SPDIF_USR_DAT_TX_A:
199 return true;
200 default:
201 return false;
202 }
203 }
204
tegra20_spdif_volatile_reg(struct device * dev,unsigned int reg)205 static bool tegra20_spdif_volatile_reg(struct device *dev, unsigned int reg)
206 {
207 switch (reg) {
208 case TEGRA20_SPDIF_STATUS:
209 case TEGRA20_SPDIF_DATA_FIFO_CSR:
210 case TEGRA20_SPDIF_DATA_OUT:
211 case TEGRA20_SPDIF_DATA_IN:
212 case TEGRA20_SPDIF_CH_STA_RX_A:
213 case TEGRA20_SPDIF_CH_STA_RX_B:
214 case TEGRA20_SPDIF_CH_STA_RX_C:
215 case TEGRA20_SPDIF_CH_STA_RX_D:
216 case TEGRA20_SPDIF_CH_STA_RX_E:
217 case TEGRA20_SPDIF_CH_STA_RX_F:
218 case TEGRA20_SPDIF_USR_STA_RX_A:
219 case TEGRA20_SPDIF_USR_DAT_TX_A:
220 return true;
221 default:
222 return false;
223 }
224 }
225
tegra20_spdif_precious_reg(struct device * dev,unsigned int reg)226 static bool tegra20_spdif_precious_reg(struct device *dev, unsigned int reg)
227 {
228 switch (reg) {
229 case TEGRA20_SPDIF_DATA_OUT:
230 case TEGRA20_SPDIF_DATA_IN:
231 case TEGRA20_SPDIF_USR_STA_RX_A:
232 case TEGRA20_SPDIF_USR_DAT_TX_A:
233 return true;
234 default:
235 return false;
236 }
237 }
238
239 static const struct regmap_config tegra20_spdif_regmap_config = {
240 .reg_bits = 32,
241 .reg_stride = 4,
242 .val_bits = 32,
243 .max_register = TEGRA20_SPDIF_USR_DAT_TX_A,
244 .writeable_reg = tegra20_spdif_wr_rd_reg,
245 .readable_reg = tegra20_spdif_wr_rd_reg,
246 .volatile_reg = tegra20_spdif_volatile_reg,
247 .precious_reg = tegra20_spdif_precious_reg,
248 .cache_type = REGCACHE_FLAT,
249 };
250
tegra20_spdif_platform_probe(struct platform_device * pdev)251 static int tegra20_spdif_platform_probe(struct platform_device *pdev)
252 {
253 struct tegra20_spdif *spdif;
254 struct resource *mem, *dmareq;
255 void __iomem *regs;
256 int ret;
257
258 spdif = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_spdif),
259 GFP_KERNEL);
260 if (!spdif)
261 return -ENOMEM;
262
263 dev_set_drvdata(&pdev->dev, spdif);
264
265 spdif->clk_spdif_out = devm_clk_get(&pdev->dev, "spdif_out");
266 if (IS_ERR(spdif->clk_spdif_out)) {
267 pr_err("Can't retrieve spdif clock\n");
268 ret = PTR_ERR(spdif->clk_spdif_out);
269 return ret;
270 }
271
272 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
273 regs = devm_ioremap_resource(&pdev->dev, mem);
274 if (IS_ERR(regs))
275 return PTR_ERR(regs);
276
277 dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
278 if (!dmareq) {
279 dev_err(&pdev->dev, "No DMA resource\n");
280 return -ENODEV;
281 }
282
283 spdif->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
284 &tegra20_spdif_regmap_config);
285 if (IS_ERR(spdif->regmap)) {
286 dev_err(&pdev->dev, "regmap init failed\n");
287 ret = PTR_ERR(spdif->regmap);
288 return ret;
289 }
290
291 spdif->playback_dma_data.addr = mem->start + TEGRA20_SPDIF_DATA_OUT;
292 spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
293 spdif->playback_dma_data.maxburst = 4;
294 spdif->playback_dma_data.slave_id = dmareq->start;
295
296 pm_runtime_enable(&pdev->dev);
297 if (!pm_runtime_enabled(&pdev->dev)) {
298 ret = tegra20_spdif_runtime_resume(&pdev->dev);
299 if (ret)
300 goto err_pm_disable;
301 }
302
303 ret = snd_soc_register_component(&pdev->dev, &tegra20_spdif_component,
304 &tegra20_spdif_dai, 1);
305 if (ret) {
306 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
307 ret = -ENOMEM;
308 goto err_suspend;
309 }
310
311 ret = tegra_pcm_platform_register(&pdev->dev);
312 if (ret) {
313 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
314 goto err_unregister_component;
315 }
316
317 return 0;
318
319 err_unregister_component:
320 snd_soc_unregister_component(&pdev->dev);
321 err_suspend:
322 if (!pm_runtime_status_suspended(&pdev->dev))
323 tegra20_spdif_runtime_suspend(&pdev->dev);
324 err_pm_disable:
325 pm_runtime_disable(&pdev->dev);
326
327 return ret;
328 }
329
tegra20_spdif_platform_remove(struct platform_device * pdev)330 static int tegra20_spdif_platform_remove(struct platform_device *pdev)
331 {
332 pm_runtime_disable(&pdev->dev);
333 if (!pm_runtime_status_suspended(&pdev->dev))
334 tegra20_spdif_runtime_suspend(&pdev->dev);
335
336 tegra_pcm_platform_unregister(&pdev->dev);
337 snd_soc_unregister_component(&pdev->dev);
338
339 return 0;
340 }
341
342 static const struct dev_pm_ops tegra20_spdif_pm_ops = {
343 SET_RUNTIME_PM_OPS(tegra20_spdif_runtime_suspend,
344 tegra20_spdif_runtime_resume, NULL)
345 };
346
347 static struct platform_driver tegra20_spdif_driver = {
348 .driver = {
349 .name = DRV_NAME,
350 .pm = &tegra20_spdif_pm_ops,
351 },
352 .probe = tegra20_spdif_platform_probe,
353 .remove = tegra20_spdif_platform_remove,
354 };
355
356 module_platform_driver(tegra20_spdif_driver);
357
358 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
359 MODULE_DESCRIPTION("Tegra20 SPDIF ASoC driver");
360 MODULE_LICENSE("GPL");
361 MODULE_ALIAS("platform:" DRV_NAME);
362