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Sjoerd Simonsf874b802015-10-08 15:31:13 +02001/* sound/soc/rockchip/rk_spdif.c
2 *
3 * ALSA SoC Audio Layer - Rockchip I2S Controller driver
4 *
5 * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
6 * Author: Jianqun <jay.xu@rock-chips.com>
7 * Copyright (c) 2015 Collabora Ltd.
8 * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/of_gpio.h>
18#include <linux/clk.h>
19#include <linux/pm_runtime.h>
20#include <linux/mfd/syscon.h>
21#include <linux/regmap.h>
22#include <sound/pcm_params.h>
23#include <sound/dmaengine_pcm.h>
24
25#include "rockchip_spdif.h"
26
27enum rk_spdif_type {
28 RK_SPDIF_RK3066,
29 RK_SPDIF_RK3188,
30 RK_SPDIF_RK3288,
31};
32
33#define RK3288_GRF_SOC_CON2 0x24c
34
35struct rk_spdif_dev {
36 struct device *dev;
37
38 struct clk *mclk;
39 struct clk *hclk;
40
41 struct snd_dmaengine_dai_dma_data playback_dma_data;
42
43 struct regmap *regmap;
44};
45
46static const struct of_device_id rk_spdif_match[] = {
47 { .compatible = "rockchip,rk3066-spdif",
48 .data = (void *) RK_SPDIF_RK3066 },
49 { .compatible = "rockchip,rk3188-spdif",
50 .data = (void *) RK_SPDIF_RK3188 },
51 { .compatible = "rockchip,rk3288-spdif",
52 .data = (void *) RK_SPDIF_RK3288 },
53 {},
54};
55MODULE_DEVICE_TABLE(of, rk_spdif_match);
56
57static int rk_spdif_runtime_suspend(struct device *dev)
58{
59 struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
60
61 clk_disable_unprepare(spdif->mclk);
62 clk_disable_unprepare(spdif->hclk);
63
64 return 0;
65}
66
67static int rk_spdif_runtime_resume(struct device *dev)
68{
69 struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
70 int ret;
71
72 ret = clk_prepare_enable(spdif->mclk);
73 if (ret) {
74 dev_err(spdif->dev, "mclk clock enable failed %d\n", ret);
75 return ret;
76 }
77
78 ret = clk_prepare_enable(spdif->hclk);
79 if (ret) {
80 dev_err(spdif->dev, "hclk clock enable failed %d\n", ret);
81 return ret;
82 }
83
84 return 0;
85}
86
87static int rk_spdif_hw_params(struct snd_pcm_substream *substream,
88 struct snd_pcm_hw_params *params,
89 struct snd_soc_dai *dai)
90{
91 struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
92 unsigned int val = SPDIF_CFGR_HALFWORD_ENABLE;
93 int srate, mclk;
94 int ret;
95
96 srate = params_rate(params);
97 switch (srate) {
98 case 32000:
99 case 48000:
100 case 96000:
101 mclk = 96000 * 128; /* 12288000 hz */
102 break;
103 case 44100:
104 mclk = 44100 * 256; /* 11289600 hz */
105 break;
106 case 192000:
107 mclk = 192000 * 128; /* 24576000 hz */
108 break;
109 default:
110 return -EINVAL;
111 }
112
113 switch (params_format(params)) {
114 case SNDRV_PCM_FORMAT_S16_LE:
115 val |= SPDIF_CFGR_VDW_16;
116 break;
117 case SNDRV_PCM_FORMAT_S20_3LE:
118 val |= SPDIF_CFGR_VDW_20;
119 break;
120 case SNDRV_PCM_FORMAT_S24_LE:
121 val |= SPDIF_CFGR_VDW_24;
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 /* Set clock and calculate divider */
128 ret = clk_set_rate(spdif->mclk, mclk);
129 if (ret != 0) {
130 dev_err(spdif->dev, "Failed to set module clock rate: %d\n",
131 ret);
132 return ret;
133 }
134
135 val |= SPDIF_CFGR_CLK_DIV(mclk/(srate * 256));
136 ret = regmap_update_bits(spdif->regmap, SPDIF_CFGR,
137 SPDIF_CFGR_CLK_DIV_MASK | SPDIF_CFGR_HALFWORD_ENABLE |
138 SDPIF_CFGR_VDW_MASK,
139 val);
140
141 return ret;
142}
143
144static int rk_spdif_trigger(struct snd_pcm_substream *substream,
145 int cmd, struct snd_soc_dai *dai)
146{
147 struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
148 int ret;
149
150 switch (cmd) {
151 case SNDRV_PCM_TRIGGER_START:
152 case SNDRV_PCM_TRIGGER_RESUME:
153 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
154 ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
155 SPDIF_DMACR_TDE_ENABLE,
156 SPDIF_DMACR_TDE_ENABLE);
157
158 if (ret != 0)
159 return ret;
160
161 ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
162 SPDIF_XFER_TXS_START,
163 SPDIF_XFER_TXS_START);
164 break;
165 case SNDRV_PCM_TRIGGER_SUSPEND:
166 case SNDRV_PCM_TRIGGER_STOP:
167 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
168 ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
169 SPDIF_DMACR_TDE_ENABLE,
170 SPDIF_DMACR_TDE_DISABLE);
171
172 if (ret != 0)
173 return ret;
174
175 ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
176 SPDIF_XFER_TXS_START,
177 SPDIF_XFER_TXS_STOP);
178 break;
179 default:
180 ret = -EINVAL;
181 break;
182 }
183
184 return ret;
185}
186
187static int rk_spdif_dai_probe(struct snd_soc_dai *dai)
188{
189 struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
190
191 dai->playback_dma_data = &spdif->playback_dma_data;
192
193 return 0;
194}
195
196static const struct snd_soc_dai_ops rk_spdif_dai_ops = {
197 .hw_params = rk_spdif_hw_params,
198 .trigger = rk_spdif_trigger,
199};
200
201static struct snd_soc_dai_driver rk_spdif_dai = {
202 .probe = rk_spdif_dai_probe,
203 .playback = {
204 .stream_name = "Playback",
205 .channels_min = 2,
206 .channels_max = 2,
207 .rates = (SNDRV_PCM_RATE_32000 |
208 SNDRV_PCM_RATE_44100 |
209 SNDRV_PCM_RATE_48000 |
210 SNDRV_PCM_RATE_96000 |
211 SNDRV_PCM_RATE_192000),
212 .formats = (SNDRV_PCM_FMTBIT_S16_LE |
213 SNDRV_PCM_FMTBIT_S20_3LE |
214 SNDRV_PCM_FMTBIT_S24_LE),
215 },
216 .ops = &rk_spdif_dai_ops,
217};
218
219static const struct snd_soc_component_driver rk_spdif_component = {
220 .name = "rockchip-spdif",
221};
222
223static bool rk_spdif_wr_reg(struct device *dev, unsigned int reg)
224{
225 switch (reg) {
226 case SPDIF_CFGR:
227 case SPDIF_DMACR:
228 case SPDIF_INTCR:
229 case SPDIF_XFER:
230 case SPDIF_SMPDR:
231 return true;
232 default:
233 return false;
234 }
235}
236
237static bool rk_spdif_rd_reg(struct device *dev, unsigned int reg)
238{
239 switch (reg) {
240 case SPDIF_CFGR:
241 case SPDIF_SDBLR:
242 case SPDIF_INTCR:
243 case SPDIF_INTSR:
244 case SPDIF_XFER:
245 return true;
246 default:
247 return false;
248 }
249}
250
251static bool rk_spdif_volatile_reg(struct device *dev, unsigned int reg)
252{
253 switch (reg) {
254 case SPDIF_INTSR:
255 case SPDIF_SDBLR:
256 return true;
257 default:
258 return false;
259 }
260}
261
262static const struct regmap_config rk_spdif_regmap_config = {
263 .reg_bits = 32,
264 .reg_stride = 4,
265 .val_bits = 32,
266 .max_register = SPDIF_SMPDR,
267 .writeable_reg = rk_spdif_wr_reg,
268 .readable_reg = rk_spdif_rd_reg,
269 .volatile_reg = rk_spdif_volatile_reg,
270 .cache_type = REGCACHE_FLAT,
271};
272
273static int rk_spdif_probe(struct platform_device *pdev)
274{
275 struct device_node *np = pdev->dev.of_node;
276 struct rk_spdif_dev *spdif;
277 const struct of_device_id *match;
278 struct resource *res;
279 void __iomem *regs;
280 int ret;
281
282 match = of_match_node(rk_spdif_match, np);
283 if ((int) match->data == RK_SPDIF_RK3288) {
284 struct regmap *grf;
285
286 grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
287 if (IS_ERR(grf)) {
288 dev_err(&pdev->dev,
289 "rockchip_spdif missing 'rockchip,grf' \n");
290 return PTR_ERR(grf);
291 }
292
293 /* Select the 8 channel SPDIF solution on RK3288 as
294 * the 2 channel one does not appear to work
295 */
296 regmap_write(grf, RK3288_GRF_SOC_CON2, BIT(1) << 16);
297 }
298
299 spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
300 if (!spdif)
301 return -ENOMEM;
302
303 spdif->hclk = devm_clk_get(&pdev->dev, "hclk");
304 if (IS_ERR(spdif->hclk)) {
305 dev_err(&pdev->dev, "Can't retrieve rk_spdif bus clock\n");
306 return PTR_ERR(spdif->hclk);
307 }
308 ret = clk_prepare_enable(spdif->hclk);
309 if (ret) {
310 dev_err(spdif->dev, "hclock enable failed %d\n", ret);
311 return ret;
312 }
313
314 spdif->mclk = devm_clk_get(&pdev->dev, "mclk");
315 if (IS_ERR(spdif->mclk)) {
316 dev_err(&pdev->dev, "Can't retrieve rk_spdif master clock\n");
317 return PTR_ERR(spdif->mclk);
318 }
319
320 ret = clk_prepare_enable(spdif->mclk);
321 if (ret) {
322 dev_err(spdif->dev, "clock enable failed %d\n", ret);
323 return ret;
324 }
325
326 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
327 regs = devm_ioremap_resource(&pdev->dev, res);
328 if (IS_ERR(regs))
329 return PTR_ERR(regs);
330
331 spdif->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "hclk", regs,
332 &rk_spdif_regmap_config);
333 if (IS_ERR(spdif->regmap)) {
334 dev_err(&pdev->dev,
335 "Failed to initialise managed register map\n");
336 return PTR_ERR(spdif->regmap);
337 }
338
339 spdif->playback_dma_data.addr = res->start + SPDIF_SMPDR;
340 spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
341 spdif->playback_dma_data.maxburst = 4;
342
343 spdif->dev = &pdev->dev;
344 dev_set_drvdata(&pdev->dev, spdif);
345
346 pm_runtime_set_active(&pdev->dev);
347 pm_runtime_enable(&pdev->dev);
348 pm_request_idle(&pdev->dev);
349
350 ret = devm_snd_soc_register_component(&pdev->dev,
351 &rk_spdif_component,
352 &rk_spdif_dai, 1);
353 if (ret) {
354 dev_err(&pdev->dev, "Could not register DAI\n");
355 goto err_pm_runtime;
356 }
357
Axel Lin20570202015-10-13 10:37:10 +0800358 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
Sjoerd Simonsf874b802015-10-08 15:31:13 +0200359 if (ret) {
360 dev_err(&pdev->dev, "Could not register PCM\n");
Axel Lin20570202015-10-13 10:37:10 +0800361 goto err_pm_runtime;
Sjoerd Simonsf874b802015-10-08 15:31:13 +0200362 }
363
364 return 0;
365
Sjoerd Simonsf874b802015-10-08 15:31:13 +0200366err_pm_runtime:
367 pm_runtime_disable(&pdev->dev);
368
369 return ret;
370}
371
372static int rk_spdif_remove(struct platform_device *pdev)
373{
374 struct rk_spdif_dev *spdif = dev_get_drvdata(&pdev->dev);
375
376 pm_runtime_disable(&pdev->dev);
377 if (!pm_runtime_status_suspended(&pdev->dev))
378 rk_spdif_runtime_suspend(&pdev->dev);
379
380 clk_disable_unprepare(spdif->mclk);
381 clk_disable_unprepare(spdif->hclk);
Sjoerd Simonsf874b802015-10-08 15:31:13 +0200382
383 return 0;
384}
385
386static const struct dev_pm_ops rk_spdif_pm_ops = {
387 SET_RUNTIME_PM_OPS(rk_spdif_runtime_suspend, rk_spdif_runtime_resume,
388 NULL)
389};
390
391static struct platform_driver rk_spdif_driver = {
392 .probe = rk_spdif_probe,
393 .remove = rk_spdif_remove,
394 .driver = {
395 .name = "rockchip-spdif",
396 .of_match_table = of_match_ptr(rk_spdif_match),
397 .pm = &rk_spdif_pm_ops,
398 },
399};
400module_platform_driver(rk_spdif_driver);
401
402MODULE_ALIAS("platform:rockchip-spdif");
403MODULE_DESCRIPTION("ROCKCHIP SPDIF transceiver Interface");
404MODULE_AUTHOR("Sjoerd Simons <sjoerd.simons@collabora.co.uk>");
405MODULE_LICENSE("GPL v2");