xref: /linux/sound/soc/rockchip/rockchip_spdif.c (revision 16018c0d27eda6a7f69dafa750d23770fb46b00f) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* sound/soc/rockchip/rk_spdif.c
3  *
4  * ALSA SoC Audio Layer - Rockchip I2S Controller driver
5  *
6  * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
7  * Author: Jianqun <jay.xu@rock-chips.com>
8  * Copyright (c) 2015 Collabora Ltd.
9  * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
10  */
11 
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/of_gpio.h>
15 #include <linux/clk.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/regmap.h>
19 #include <sound/pcm_params.h>
20 #include <sound/dmaengine_pcm.h>
21 
22 #include "rockchip_spdif.h"
23 
24 enum rk_spdif_type {
25 	RK_SPDIF_RK3066,
26 	RK_SPDIF_RK3188,
27 	RK_SPDIF_RK3288,
28 	RK_SPDIF_RK3366,
29 };
30 
31 #define RK3288_GRF_SOC_CON2 0x24c
32 
33 struct rk_spdif_dev {
34 	struct device *dev;
35 
36 	struct clk *mclk;
37 	struct clk *hclk;
38 
39 	struct snd_dmaengine_dai_dma_data playback_dma_data;
40 
41 	struct regmap *regmap;
42 };
43 
44 static const struct of_device_id rk_spdif_match[] __maybe_unused = {
45 	{ .compatible = "rockchip,rk3066-spdif",
46 	  .data = (void *)RK_SPDIF_RK3066 },
47 	{ .compatible = "rockchip,rk3188-spdif",
48 	  .data = (void *)RK_SPDIF_RK3188 },
49 	{ .compatible = "rockchip,rk3228-spdif",
50 	  .data = (void *)RK_SPDIF_RK3366 },
51 	{ .compatible = "rockchip,rk3288-spdif",
52 	  .data = (void *)RK_SPDIF_RK3288 },
53 	{ .compatible = "rockchip,rk3328-spdif",
54 	  .data = (void *)RK_SPDIF_RK3366 },
55 	{ .compatible = "rockchip,rk3366-spdif",
56 	  .data = (void *)RK_SPDIF_RK3366 },
57 	{ .compatible = "rockchip,rk3368-spdif",
58 	  .data = (void *)RK_SPDIF_RK3366 },
59 	{ .compatible = "rockchip,rk3399-spdif",
60 	  .data = (void *)RK_SPDIF_RK3366 },
61 	{ .compatible = "rockchip,rk3568-spdif",
62 	  .data = (void *)RK_SPDIF_RK3366 },
63 	{},
64 };
65 MODULE_DEVICE_TABLE(of, rk_spdif_match);
66 
67 static int __maybe_unused rk_spdif_runtime_suspend(struct device *dev)
68 {
69 	struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
70 
71 	regcache_cache_only(spdif->regmap, true);
72 	clk_disable_unprepare(spdif->mclk);
73 	clk_disable_unprepare(spdif->hclk);
74 
75 	return 0;
76 }
77 
78 static int __maybe_unused rk_spdif_runtime_resume(struct device *dev)
79 {
80 	struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
81 	int ret;
82 
83 	ret = clk_prepare_enable(spdif->mclk);
84 	if (ret) {
85 		dev_err(spdif->dev, "mclk clock enable failed %d\n", ret);
86 		return ret;
87 	}
88 
89 	ret = clk_prepare_enable(spdif->hclk);
90 	if (ret) {
91 		dev_err(spdif->dev, "hclk clock enable failed %d\n", ret);
92 		return ret;
93 	}
94 
95 	regcache_cache_only(spdif->regmap, false);
96 	regcache_mark_dirty(spdif->regmap);
97 
98 	ret = regcache_sync(spdif->regmap);
99 	if (ret) {
100 		clk_disable_unprepare(spdif->mclk);
101 		clk_disable_unprepare(spdif->hclk);
102 	}
103 
104 	return ret;
105 }
106 
107 static int rk_spdif_hw_params(struct snd_pcm_substream *substream,
108 			      struct snd_pcm_hw_params *params,
109 			      struct snd_soc_dai *dai)
110 {
111 	struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
112 	unsigned int val = SPDIF_CFGR_HALFWORD_ENABLE;
113 	int srate, mclk;
114 	int ret;
115 
116 	srate = params_rate(params);
117 	mclk = srate * 128;
118 
119 	switch (params_format(params)) {
120 	case SNDRV_PCM_FORMAT_S16_LE:
121 		val |= SPDIF_CFGR_VDW_16;
122 		break;
123 	case SNDRV_PCM_FORMAT_S20_3LE:
124 		val |= SPDIF_CFGR_VDW_20;
125 		break;
126 	case SNDRV_PCM_FORMAT_S24_LE:
127 		val |= SPDIF_CFGR_VDW_24;
128 		break;
129 	default:
130 		return -EINVAL;
131 	}
132 
133 	/* Set clock and calculate divider */
134 	ret = clk_set_rate(spdif->mclk, mclk);
135 	if (ret != 0) {
136 		dev_err(spdif->dev, "Failed to set module clock rate: %d\n",
137 			ret);
138 		return ret;
139 	}
140 
141 	ret = regmap_update_bits(spdif->regmap, SPDIF_CFGR,
142 				 SPDIF_CFGR_CLK_DIV_MASK |
143 				 SPDIF_CFGR_HALFWORD_ENABLE |
144 				 SDPIF_CFGR_VDW_MASK, val);
145 
146 	return ret;
147 }
148 
149 static int rk_spdif_trigger(struct snd_pcm_substream *substream,
150 			    int cmd, struct snd_soc_dai *dai)
151 {
152 	struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
153 	int ret;
154 
155 	switch (cmd) {
156 	case SNDRV_PCM_TRIGGER_START:
157 	case SNDRV_PCM_TRIGGER_RESUME:
158 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
159 		ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
160 					 SPDIF_DMACR_TDE_ENABLE |
161 					 SPDIF_DMACR_TDL_MASK,
162 					 SPDIF_DMACR_TDE_ENABLE |
163 					 SPDIF_DMACR_TDL(16));
164 
165 		if (ret != 0)
166 			return ret;
167 
168 		ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
169 					 SPDIF_XFER_TXS_START,
170 					 SPDIF_XFER_TXS_START);
171 		break;
172 	case SNDRV_PCM_TRIGGER_SUSPEND:
173 	case SNDRV_PCM_TRIGGER_STOP:
174 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
175 		ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
176 					 SPDIF_DMACR_TDE_ENABLE,
177 					 SPDIF_DMACR_TDE_DISABLE);
178 
179 		if (ret != 0)
180 			return ret;
181 
182 		ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
183 					 SPDIF_XFER_TXS_START,
184 					 SPDIF_XFER_TXS_STOP);
185 		break;
186 	default:
187 		ret = -EINVAL;
188 		break;
189 	}
190 
191 	return ret;
192 }
193 
194 static int rk_spdif_dai_probe(struct snd_soc_dai *dai)
195 {
196 	struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
197 
198 	dai->playback_dma_data = &spdif->playback_dma_data;
199 
200 	return 0;
201 }
202 
203 static const struct snd_soc_dai_ops rk_spdif_dai_ops = {
204 	.hw_params = rk_spdif_hw_params,
205 	.trigger = rk_spdif_trigger,
206 };
207 
208 static struct snd_soc_dai_driver rk_spdif_dai = {
209 	.probe = rk_spdif_dai_probe,
210 	.playback = {
211 		.stream_name = "Playback",
212 		.channels_min = 2,
213 		.channels_max = 2,
214 		.rates = (SNDRV_PCM_RATE_32000 |
215 			  SNDRV_PCM_RATE_44100 |
216 			  SNDRV_PCM_RATE_48000 |
217 			  SNDRV_PCM_RATE_96000 |
218 			  SNDRV_PCM_RATE_192000),
219 		.formats = (SNDRV_PCM_FMTBIT_S16_LE |
220 			    SNDRV_PCM_FMTBIT_S20_3LE |
221 			    SNDRV_PCM_FMTBIT_S24_LE),
222 	},
223 	.ops = &rk_spdif_dai_ops,
224 };
225 
226 static const struct snd_soc_component_driver rk_spdif_component = {
227 	.name = "rockchip-spdif",
228 };
229 
230 static bool rk_spdif_wr_reg(struct device *dev, unsigned int reg)
231 {
232 	switch (reg) {
233 	case SPDIF_CFGR:
234 	case SPDIF_DMACR:
235 	case SPDIF_INTCR:
236 	case SPDIF_XFER:
237 	case SPDIF_SMPDR:
238 		return true;
239 	default:
240 		return false;
241 	}
242 }
243 
244 static bool rk_spdif_rd_reg(struct device *dev, unsigned int reg)
245 {
246 	switch (reg) {
247 	case SPDIF_CFGR:
248 	case SPDIF_SDBLR:
249 	case SPDIF_INTCR:
250 	case SPDIF_INTSR:
251 	case SPDIF_XFER:
252 	case SPDIF_SMPDR:
253 		return true;
254 	default:
255 		return false;
256 	}
257 }
258 
259 static bool rk_spdif_volatile_reg(struct device *dev, unsigned int reg)
260 {
261 	switch (reg) {
262 	case SPDIF_INTSR:
263 	case SPDIF_SDBLR:
264 	case SPDIF_SMPDR:
265 		return true;
266 	default:
267 		return false;
268 	}
269 }
270 
271 static const struct regmap_config rk_spdif_regmap_config = {
272 	.reg_bits = 32,
273 	.reg_stride = 4,
274 	.val_bits = 32,
275 	.max_register = SPDIF_SMPDR,
276 	.writeable_reg = rk_spdif_wr_reg,
277 	.readable_reg = rk_spdif_rd_reg,
278 	.volatile_reg = rk_spdif_volatile_reg,
279 	.cache_type = REGCACHE_FLAT,
280 };
281 
282 static int rk_spdif_probe(struct platform_device *pdev)
283 {
284 	struct device_node *np = pdev->dev.of_node;
285 	struct rk_spdif_dev *spdif;
286 	const struct of_device_id *match;
287 	struct resource *res;
288 	void __iomem *regs;
289 	int ret;
290 
291 	match = of_match_node(rk_spdif_match, np);
292 	if (match->data == (void *)RK_SPDIF_RK3288) {
293 		struct regmap *grf;
294 
295 		grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
296 		if (IS_ERR(grf)) {
297 			dev_err(&pdev->dev,
298 				"rockchip_spdif missing 'rockchip,grf'\n");
299 			return PTR_ERR(grf);
300 		}
301 
302 		/* Select the 8 channel SPDIF solution on RK3288 as
303 		 * the 2 channel one does not appear to work
304 		 */
305 		regmap_write(grf, RK3288_GRF_SOC_CON2, BIT(1) << 16);
306 	}
307 
308 	spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
309 	if (!spdif)
310 		return -ENOMEM;
311 
312 	spdif->hclk = devm_clk_get(&pdev->dev, "hclk");
313 	if (IS_ERR(spdif->hclk))
314 		return PTR_ERR(spdif->hclk);
315 
316 	spdif->mclk = devm_clk_get(&pdev->dev, "mclk");
317 	if (IS_ERR(spdif->mclk))
318 		return PTR_ERR(spdif->mclk);
319 
320 	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
321 	if (IS_ERR(regs))
322 		return PTR_ERR(regs);
323 
324 	spdif->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "hclk", regs,
325 						  &rk_spdif_regmap_config);
326 	if (IS_ERR(spdif->regmap))
327 		return PTR_ERR(spdif->regmap);
328 
329 	spdif->playback_dma_data.addr = res->start + SPDIF_SMPDR;
330 	spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
331 	spdif->playback_dma_data.maxburst = 4;
332 
333 	spdif->dev = &pdev->dev;
334 	dev_set_drvdata(&pdev->dev, spdif);
335 
336 	pm_runtime_enable(&pdev->dev);
337 	if (!pm_runtime_enabled(&pdev->dev)) {
338 		ret = rk_spdif_runtime_resume(&pdev->dev);
339 		if (ret)
340 			goto err_pm_runtime;
341 	}
342 
343 	ret = devm_snd_soc_register_component(&pdev->dev,
344 					      &rk_spdif_component,
345 					      &rk_spdif_dai, 1);
346 	if (ret) {
347 		dev_err(&pdev->dev, "Could not register DAI\n");
348 		goto err_pm_suspend;
349 	}
350 
351 	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
352 	if (ret) {
353 		dev_err(&pdev->dev, "Could not register PCM\n");
354 		goto err_pm_suspend;
355 	}
356 
357 	return 0;
358 
359 err_pm_suspend:
360 	if (!pm_runtime_status_suspended(&pdev->dev))
361 		rk_spdif_runtime_suspend(&pdev->dev);
362 err_pm_runtime:
363 	pm_runtime_disable(&pdev->dev);
364 
365 	return ret;
366 }
367 
368 static int rk_spdif_remove(struct platform_device *pdev)
369 {
370 	pm_runtime_disable(&pdev->dev);
371 	if (!pm_runtime_status_suspended(&pdev->dev))
372 		rk_spdif_runtime_suspend(&pdev->dev);
373 
374 	return 0;
375 }
376 
377 static const struct dev_pm_ops rk_spdif_pm_ops = {
378 	SET_RUNTIME_PM_OPS(rk_spdif_runtime_suspend, rk_spdif_runtime_resume,
379 			   NULL)
380 };
381 
382 static struct platform_driver rk_spdif_driver = {
383 	.probe = rk_spdif_probe,
384 	.remove = rk_spdif_remove,
385 	.driver = {
386 		.name = "rockchip-spdif",
387 		.of_match_table = of_match_ptr(rk_spdif_match),
388 		.pm = &rk_spdif_pm_ops,
389 	},
390 };
391 module_platform_driver(rk_spdif_driver);
392 
393 MODULE_ALIAS("platform:rockchip-spdif");
394 MODULE_DESCRIPTION("ROCKCHIP SPDIF transceiver Interface");
395 MODULE_AUTHOR("Sjoerd Simons <sjoerd.simons@collabora.co.uk>");
396 MODULE_LICENSE("GPL v2");
397