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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / sound / soc / sunxi / sun4i-spdif.c
blob98a9fe64552138ee5c6809b66eceb1c0653150f0
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ALSA SoC SPDIF Audio Layer
4 *
5 * Copyright 2015 Andrea Venturi <be17068@iperbole.bo.it>
6 * Copyright 2015 Marcus Cooper <codekipper@gmail.com>
7 *
8 * Based on the Allwinner SDK driver, released under the GPL.
9 */
10
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/regmap.h>
17 #include <linux/of_address.h>
18 #include <linux/of_device.h>
19 #include <linux/ioport.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/reset.h>
24 #include <sound/dmaengine_pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/soc.h>
27
28 #define SUN4I_SPDIF_CTL (0x00)
29 #define SUN4I_SPDIF_CTL_MCLKDIV(v) ((v) << 4) /* v even */
30 #define SUN4I_SPDIF_CTL_MCLKOUTEN BIT(2)
31 #define SUN4I_SPDIF_CTL_GEN BIT(1)
32 #define SUN4I_SPDIF_CTL_RESET BIT(0)
33
34 #define SUN4I_SPDIF_TXCFG (0x04)
35 #define SUN4I_SPDIF_TXCFG_SINGLEMOD BIT(31)
36 #define SUN4I_SPDIF_TXCFG_ASS BIT(17)
37 #define SUN4I_SPDIF_TXCFG_NONAUDIO BIT(16)
38 #define SUN4I_SPDIF_TXCFG_TXRATIO(v) ((v) << 4)
39 #define SUN4I_SPDIF_TXCFG_TXRATIO_MASK GENMASK(8, 4)
40 #define SUN4I_SPDIF_TXCFG_FMTRVD GENMASK(3, 2)
41 #define SUN4I_SPDIF_TXCFG_FMT16BIT (0 << 2)
42 #define SUN4I_SPDIF_TXCFG_FMT20BIT (1 << 2)
43 #define SUN4I_SPDIF_TXCFG_FMT24BIT (2 << 2)
44 #define SUN4I_SPDIF_TXCFG_CHSTMODE BIT(1)
45 #define SUN4I_SPDIF_TXCFG_TXEN BIT(0)
46
47 #define SUN4I_SPDIF_RXCFG (0x08)
48 #define SUN4I_SPDIF_RXCFG_LOCKFLAG BIT(4)
49 #define SUN4I_SPDIF_RXCFG_CHSTSRC BIT(3)
50 #define SUN4I_SPDIF_RXCFG_CHSTCP BIT(1)
51 #define SUN4I_SPDIF_RXCFG_RXEN BIT(0)
52
53 #define SUN4I_SPDIF_TXFIFO (0x0C)
54
55 #define SUN4I_SPDIF_RXFIFO (0x10)
56
57 #define SUN4I_SPDIF_FCTL (0x14)
58 #define SUN4I_SPDIF_FCTL_FIFOSRC BIT(31)
59 #define SUN4I_SPDIF_FCTL_FTX BIT(17)
60 #define SUN4I_SPDIF_FCTL_FRX BIT(16)
61 #define SUN4I_SPDIF_FCTL_TXTL(v) ((v) << 8)
62 #define SUN4I_SPDIF_FCTL_TXTL_MASK GENMASK(12, 8)
63 #define SUN4I_SPDIF_FCTL_RXTL(v) ((v) << 3)
64 #define SUN4I_SPDIF_FCTL_RXTL_MASK GENMASK(7, 3)
65 #define SUN4I_SPDIF_FCTL_TXIM BIT(2)
66 #define SUN4I_SPDIF_FCTL_RXOM(v) ((v) << 0)
67 #define SUN4I_SPDIF_FCTL_RXOM_MASK GENMASK(1, 0)
68
69 #define SUN50I_H6_SPDIF_FCTL (0x14)
70 #define SUN50I_H6_SPDIF_FCTL_HUB_EN BIT(31)
71 #define SUN50I_H6_SPDIF_FCTL_FTX BIT(30)
72 #define SUN50I_H6_SPDIF_FCTL_FRX BIT(29)
73 #define SUN50I_H6_SPDIF_FCTL_TXTL(v) ((v) << 12)
74 #define SUN50I_H6_SPDIF_FCTL_TXTL_MASK GENMASK(19, 12)
75 #define SUN50I_H6_SPDIF_FCTL_RXTL(v) ((v) << 4)
76 #define SUN50I_H6_SPDIF_FCTL_RXTL_MASK GENMASK(10, 4)
77 #define SUN50I_H6_SPDIF_FCTL_TXIM BIT(2)
78 #define SUN50I_H6_SPDIF_FCTL_RXOM(v) ((v) << 0)
79 #define SUN50I_H6_SPDIF_FCTL_RXOM_MASK GENMASK(1, 0)
80
81 #define SUN4I_SPDIF_FSTA (0x18)
82 #define SUN4I_SPDIF_FSTA_TXE BIT(14)
83 #define SUN4I_SPDIF_FSTA_TXECNTSHT (8)
84 #define SUN4I_SPDIF_FSTA_RXA BIT(6)
85 #define SUN4I_SPDIF_FSTA_RXACNTSHT (0)
86
87 #define SUN4I_SPDIF_INT (0x1C)
88 #define SUN4I_SPDIF_INT_RXLOCKEN BIT(18)
89 #define SUN4I_SPDIF_INT_RXUNLOCKEN BIT(17)
90 #define SUN4I_SPDIF_INT_RXPARERREN BIT(16)
91 #define SUN4I_SPDIF_INT_TXDRQEN BIT(7)
92 #define SUN4I_SPDIF_INT_TXUIEN BIT(6)
93 #define SUN4I_SPDIF_INT_TXOIEN BIT(5)
94 #define SUN4I_SPDIF_INT_TXEIEN BIT(4)
95 #define SUN4I_SPDIF_INT_RXDRQEN BIT(2)
96 #define SUN4I_SPDIF_INT_RXOIEN BIT(1)
97 #define SUN4I_SPDIF_INT_RXAIEN BIT(0)
98
99 #define SUN4I_SPDIF_ISTA (0x20)
100 #define SUN4I_SPDIF_ISTA_RXLOCKSTA BIT(18)
101 #define SUN4I_SPDIF_ISTA_RXUNLOCKSTA BIT(17)
102 #define SUN4I_SPDIF_ISTA_RXPARERRSTA BIT(16)
103 #define SUN4I_SPDIF_ISTA_TXUSTA BIT(6)
104 #define SUN4I_SPDIF_ISTA_TXOSTA BIT(5)
105 #define SUN4I_SPDIF_ISTA_TXESTA BIT(4)
106 #define SUN4I_SPDIF_ISTA_RXOSTA BIT(1)
107 #define SUN4I_SPDIF_ISTA_RXASTA BIT(0)
108
109 #define SUN8I_SPDIF_TXFIFO (0x20)
110
111 #define SUN4I_SPDIF_TXCNT (0x24)
112
113 #define SUN4I_SPDIF_RXCNT (0x28)
114
115 #define SUN4I_SPDIF_TXCHSTA0 (0x2C)
116 #define SUN4I_SPDIF_TXCHSTA0_CLK(v) ((v) << 28)
117 #define SUN4I_SPDIF_TXCHSTA0_SAMFREQ(v) ((v) << 24)
118 #define SUN4I_SPDIF_TXCHSTA0_SAMFREQ_MASK GENMASK(27, 24)
119 #define SUN4I_SPDIF_TXCHSTA0_CHNUM(v) ((v) << 20)
120 #define SUN4I_SPDIF_TXCHSTA0_CHNUM_MASK GENMASK(23, 20)
121 #define SUN4I_SPDIF_TXCHSTA0_SRCNUM(v) ((v) << 16)
122 #define SUN4I_SPDIF_TXCHSTA0_CATACOD(v) ((v) << 8)
123 #define SUN4I_SPDIF_TXCHSTA0_MODE(v) ((v) << 6)
124 #define SUN4I_SPDIF_TXCHSTA0_EMPHASIS(v) ((v) << 3)
125 #define SUN4I_SPDIF_TXCHSTA0_CP BIT(2)
126 #define SUN4I_SPDIF_TXCHSTA0_AUDIO BIT(1)
127 #define SUN4I_SPDIF_TXCHSTA0_PRO BIT(0)
128
129 #define SUN4I_SPDIF_TXCHSTA1 (0x30)
130 #define SUN4I_SPDIF_TXCHSTA1_CGMSA(v) ((v) << 8)
131 #define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ(v) ((v) << 4)
132 #define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ_MASK GENMASK(7, 4)
133 #define SUN4I_SPDIF_TXCHSTA1_SAMWORDLEN(v) ((v) << 1)
134 #define SUN4I_SPDIF_TXCHSTA1_MAXWORDLEN BIT(0)
135
136 #define SUN4I_SPDIF_RXCHSTA0 (0x34)
137 #define SUN4I_SPDIF_RXCHSTA0_CLK(v) ((v) << 28)
138 #define SUN4I_SPDIF_RXCHSTA0_SAMFREQ(v) ((v) << 24)
139 #define SUN4I_SPDIF_RXCHSTA0_CHNUM(v) ((v) << 20)
140 #define SUN4I_SPDIF_RXCHSTA0_SRCNUM(v) ((v) << 16)
141 #define SUN4I_SPDIF_RXCHSTA0_CATACOD(v) ((v) << 8)
142 #define SUN4I_SPDIF_RXCHSTA0_MODE(v) ((v) << 6)
143 #define SUN4I_SPDIF_RXCHSTA0_EMPHASIS(v) ((v) << 3)
144 #define SUN4I_SPDIF_RXCHSTA0_CP BIT(2)
145 #define SUN4I_SPDIF_RXCHSTA0_AUDIO BIT(1)
146 #define SUN4I_SPDIF_RXCHSTA0_PRO BIT(0)
147
148 #define SUN4I_SPDIF_RXCHSTA1 (0x38)
149 #define SUN4I_SPDIF_RXCHSTA1_CGMSA(v) ((v) << 8)
150 #define SUN4I_SPDIF_RXCHSTA1_ORISAMFREQ(v) ((v) << 4)
151 #define SUN4I_SPDIF_RXCHSTA1_SAMWORDLEN(v) ((v) << 1)
152 #define SUN4I_SPDIF_RXCHSTA1_MAXWORDLEN BIT(0)
153
154 /* Defines for Sampling Frequency */
155 #define SUN4I_SPDIF_SAMFREQ_44_1KHZ 0x0
156 #define SUN4I_SPDIF_SAMFREQ_NOT_INDICATED 0x1
157 #define SUN4I_SPDIF_SAMFREQ_48KHZ 0x2
158 #define SUN4I_SPDIF_SAMFREQ_32KHZ 0x3
159 #define SUN4I_SPDIF_SAMFREQ_22_05KHZ 0x4
160 #define SUN4I_SPDIF_SAMFREQ_24KHZ 0x6
161 #define SUN4I_SPDIF_SAMFREQ_88_2KHZ 0x8
162 #define SUN4I_SPDIF_SAMFREQ_76_8KHZ 0x9
163 #define SUN4I_SPDIF_SAMFREQ_96KHZ 0xa
164 #define SUN4I_SPDIF_SAMFREQ_176_4KHZ 0xc
165 #define SUN4I_SPDIF_SAMFREQ_192KHZ 0xe
166
167 /**
168 * struct sun4i_spdif_quirks - Differences between SoC variants.
169 *
170 * @reg_dac_tx_data: TX FIFO offset for DMA config.
171 * @has_reset: SoC needs reset deasserted.
172 * @val_fctl_ftx: TX FIFO flush bitmask.
173 */
174 struct sun4i_spdif_quirks {
175 unsigned int reg_dac_txdata;
176 bool has_reset;
177 unsigned int val_fctl_ftx;
178 };
179
180 struct sun4i_spdif_dev {
181 struct platform_device *pdev;
182 struct clk *spdif_clk;
183 struct clk *apb_clk;
184 struct reset_control *rst;
185 struct snd_soc_dai_driver cpu_dai_drv;
186 struct regmap *regmap;
187 struct snd_dmaengine_dai_dma_data dma_params_tx;
188 const struct sun4i_spdif_quirks *quirks;
189 };
190
191 static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
192 {
193 const struct sun4i_spdif_quirks *quirks = host->quirks;
194
195 /* soft reset SPDIF */
196 regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
197
198 /* flush TX FIFO */
199 regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
200 quirks->val_fctl_ftx, quirks->val_fctl_ftx);
201
202 /* clear TX counter */
203 regmap_write(host->regmap, SUN4I_SPDIF_TXCNT, 0);
204 }
205
206 static void sun4i_snd_txctrl_on(struct snd_pcm_substream *substream,
207 struct sun4i_spdif_dev *host)
208 {
209 if (substream->runtime->channels == 1)
210 regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
211 SUN4I_SPDIF_TXCFG_SINGLEMOD,
212 SUN4I_SPDIF_TXCFG_SINGLEMOD);
213
214 /* SPDIF TX ENABLE */
215 regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
216 SUN4I_SPDIF_TXCFG_TXEN, SUN4I_SPDIF_TXCFG_TXEN);
217
218 /* DRQ ENABLE */
219 regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
220 SUN4I_SPDIF_INT_TXDRQEN, SUN4I_SPDIF_INT_TXDRQEN);
221
222 /* Global enable */
223 regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
224 SUN4I_SPDIF_CTL_GEN, SUN4I_SPDIF_CTL_GEN);
225 }
226
227 static void sun4i_snd_txctrl_off(struct snd_pcm_substream *substream,
228 struct sun4i_spdif_dev *host)
229 {
230 /* SPDIF TX DISABLE */
231 regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
232 SUN4I_SPDIF_TXCFG_TXEN, 0);
233
234 /* DRQ DISABLE */
235 regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
236 SUN4I_SPDIF_INT_TXDRQEN, 0);
237
238 /* Global disable */
239 regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
240 SUN4I_SPDIF_CTL_GEN, 0);
241 }
242
243 static int sun4i_spdif_startup(struct snd_pcm_substream *substream,
244 struct snd_soc_dai *cpu_dai)
245 {
246 struct snd_soc_pcm_runtime *rtd = substream->private_data;
247 struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(rtd->cpu_dai);
248
249 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
250 return -EINVAL;
251
252 sun4i_spdif_configure(host);
253
254 return 0;
255 }
256
257 static int sun4i_spdif_hw_params(struct snd_pcm_substream *substream,
258 struct snd_pcm_hw_params *params,
259 struct snd_soc_dai *cpu_dai)
260 {
261 int ret = 0;
262 int fmt;
263 unsigned long rate = params_rate(params);
264 u32 mclk_div = 0;
265 unsigned int mclk = 0;
266 u32 reg_val;
267 struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
268 struct platform_device *pdev = host->pdev;
269
270 /* Add the PCM and raw data select interface */
271 switch (params_channels(params)) {
272 case 1: /* PCM mode */
273 case 2:
274 fmt = 0;
275 break;
276 case 4: /* raw data mode */
277 fmt = SUN4I_SPDIF_TXCFG_NONAUDIO;
278 break;
279 default:
280 return -EINVAL;
281 }
282
283 switch (params_format(params)) {
284 case SNDRV_PCM_FORMAT_S16_LE:
285 fmt |= SUN4I_SPDIF_TXCFG_FMT16BIT;
286 break;
287 case SNDRV_PCM_FORMAT_S20_3LE:
288 fmt |= SUN4I_SPDIF_TXCFG_FMT20BIT;
289 break;
290 case SNDRV_PCM_FORMAT_S24_LE:
291 fmt |= SUN4I_SPDIF_TXCFG_FMT24BIT;
292 break;
293 default:
294 return -EINVAL;
295 }
296
297 switch (rate) {
298 case 22050:
299 case 44100:
300 case 88200:
301 case 176400:
302 mclk = 22579200;
303 break;
304 case 24000:
305 case 32000:
306 case 48000:
307 case 96000:
308 case 192000:
309 mclk = 24576000;
310 break;
311 default:
312 return -EINVAL;
313 }
314
315 ret = clk_set_rate(host->spdif_clk, mclk);
316 if (ret < 0) {
317 dev_err(&pdev->dev,
318 "Setting SPDIF clock rate for %d Hz failed!\n", mclk);
319 return ret;
320 }
321
322 regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
323 SUN4I_SPDIF_FCTL_TXIM, SUN4I_SPDIF_FCTL_TXIM);
324
325 switch (rate) {
326 case 22050:
327 case 24000:
328 mclk_div = 8;
329 break;
330 case 32000:
331 mclk_div = 6;
332 break;
333 case 44100:
334 case 48000:
335 mclk_div = 4;
336 break;
337 case 88200:
338 case 96000:
339 mclk_div = 2;
340 break;
341 case 176400:
342 case 192000:
343 mclk_div = 1;
344 break;
345 default:
346 return -EINVAL;
347 }
348
349 reg_val = 0;
350 reg_val |= SUN4I_SPDIF_TXCFG_ASS;
351 reg_val |= fmt; /* set non audio and bit depth */
352 reg_val |= SUN4I_SPDIF_TXCFG_CHSTMODE;
353 reg_val |= SUN4I_SPDIF_TXCFG_TXRATIO(mclk_div - 1);
354 regmap_write(host->regmap, SUN4I_SPDIF_TXCFG, reg_val);
355
356 return 0;
357 }
358
359 static int sun4i_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
360 struct snd_soc_dai *dai)
361 {
362 int ret = 0;
363 struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
364
365 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
366 return -EINVAL;
367
368 switch (cmd) {
369 case SNDRV_PCM_TRIGGER_START:
370 case SNDRV_PCM_TRIGGER_RESUME:
371 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
372 sun4i_snd_txctrl_on(substream, host);
373 break;
374
375 case SNDRV_PCM_TRIGGER_STOP:
376 case SNDRV_PCM_TRIGGER_SUSPEND:
377 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
378 sun4i_snd_txctrl_off(substream, host);
379 break;
380
381 default:
382 ret = -EINVAL;
383 break;
384 }
385 return ret;
386 }
387
388 static int sun4i_spdif_soc_dai_probe(struct snd_soc_dai *dai)
389 {
390 struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
391
392 snd_soc_dai_init_dma_data(dai, &host->dma_params_tx, NULL);
393 return 0;
394 }
395
396 static const struct snd_soc_dai_ops sun4i_spdif_dai_ops = {
397 .startup = sun4i_spdif_startup,
398 .trigger = sun4i_spdif_trigger,
399 .hw_params = sun4i_spdif_hw_params,
400 };
401
402 static const struct regmap_config sun4i_spdif_regmap_config = {
403 .reg_bits = 32,
404 .reg_stride = 4,
405 .val_bits = 32,
406 .max_register = SUN4I_SPDIF_RXCHSTA1,
407 };
408
409 #define SUN4I_RATES SNDRV_PCM_RATE_8000_192000
410
411 #define SUN4I_FORMATS (SNDRV_PCM_FORMAT_S16_LE | \
412 SNDRV_PCM_FORMAT_S20_3LE | \
413 SNDRV_PCM_FORMAT_S24_LE)
414
415 static struct snd_soc_dai_driver sun4i_spdif_dai = {
416 .playback = {
417 .channels_min = 1,
418 .channels_max = 2,
419 .rates = SUN4I_RATES,
420 .formats = SUN4I_FORMATS,
421 },
422 .probe = sun4i_spdif_soc_dai_probe,
423 .ops = &sun4i_spdif_dai_ops,
424 .name = "spdif",
425 };
426
427 static const struct sun4i_spdif_quirks sun4i_a10_spdif_quirks = {
428 .reg_dac_txdata = SUN4I_SPDIF_TXFIFO,
429 .val_fctl_ftx = SUN4I_SPDIF_FCTL_FTX,
430 };
431
432 static const struct sun4i_spdif_quirks sun6i_a31_spdif_quirks = {
433 .reg_dac_txdata = SUN4I_SPDIF_TXFIFO,
434 .val_fctl_ftx = SUN4I_SPDIF_FCTL_FTX,
435 .has_reset = true,
436 };
437
438 static const struct sun4i_spdif_quirks sun8i_h3_spdif_quirks = {
439 .reg_dac_txdata = SUN8I_SPDIF_TXFIFO,
440 .val_fctl_ftx = SUN4I_SPDIF_FCTL_FTX,
441 .has_reset = true,
442 };
443
444 static const struct sun4i_spdif_quirks sun50i_h6_spdif_quirks = {
445 .reg_dac_txdata = SUN8I_SPDIF_TXFIFO,
446 .val_fctl_ftx = SUN50I_H6_SPDIF_FCTL_FTX,
447 .has_reset = true,
448 };
449
450 static const struct of_device_id sun4i_spdif_of_match[] = {
451 {
452 .compatible = "allwinner,sun4i-a10-spdif",
453 .data = &sun4i_a10_spdif_quirks,
454 },
455 {
456 .compatible = "allwinner,sun6i-a31-spdif",
457 .data = &sun6i_a31_spdif_quirks,
458 },
459 {
460 .compatible = "allwinner,sun8i-h3-spdif",
461 .data = &sun8i_h3_spdif_quirks,
462 },
463 {
464 .compatible = "allwinner,sun50i-h6-spdif",
465 .data = &sun50i_h6_spdif_quirks,
466 },
467 { /* sentinel */ }
468 };
469 MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
470
471 static const struct snd_soc_component_driver sun4i_spdif_component = {
472 .name = "sun4i-spdif",
473 };
474
475 static int sun4i_spdif_runtime_suspend(struct device *dev)
476 {
477 struct sun4i_spdif_dev *host = dev_get_drvdata(dev);
478
479 clk_disable_unprepare(host->spdif_clk);
480 clk_disable_unprepare(host->apb_clk);
481
482 return 0;
483 }
484
485 static int sun4i_spdif_runtime_resume(struct device *dev)
486 {
487 struct sun4i_spdif_dev *host = dev_get_drvdata(dev);
488 int ret;
489
490 ret = clk_prepare_enable(host->spdif_clk);
491 if (ret)
492 return ret;
493 ret = clk_prepare_enable(host->apb_clk);
494 if (ret)
495 clk_disable_unprepare(host->spdif_clk);
496
497 return ret;
498 }
499
500 static int sun4i_spdif_probe(struct platform_device *pdev)
501 {
502 struct sun4i_spdif_dev *host;
503 struct resource *res;
504 const struct sun4i_spdif_quirks *quirks;
505 int ret;
506 void __iomem *base;
507
508 dev_dbg(&pdev->dev, "Entered %s\n", __func__);
509
510 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
511 if (!host)
512 return -ENOMEM;
513
514 host->pdev = pdev;
515
516 /* Initialize this copy of the CPU DAI driver structure */
517 memcpy(&host->cpu_dai_drv, &sun4i_spdif_dai, sizeof(sun4i_spdif_dai));
518 host->cpu_dai_drv.name = dev_name(&pdev->dev);
519
520 /* Get the addresses */
521 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
522 base = devm_ioremap_resource(&pdev->dev, res);
523 if (IS_ERR(base))
524 return PTR_ERR(base);
525
526 quirks = of_device_get_match_data(&pdev->dev);
527 if (quirks == NULL) {
528 dev_err(&pdev->dev, "Failed to determine the quirks to use\n");
529 return -ENODEV;
530 }
531 host->quirks = quirks;
532
533 host->regmap = devm_regmap_init_mmio(&pdev->dev, base,
534 &sun4i_spdif_regmap_config);
535
536 /* Clocks */
537 host->apb_clk = devm_clk_get(&pdev->dev, "apb");
538 if (IS_ERR(host->apb_clk)) {
539 dev_err(&pdev->dev, "failed to get a apb clock.\n");
540 return PTR_ERR(host->apb_clk);
541 }
542
543 host->spdif_clk = devm_clk_get(&pdev->dev, "spdif");
544 if (IS_ERR(host->spdif_clk)) {
545 dev_err(&pdev->dev, "failed to get a spdif clock.\n");
546 return PTR_ERR(host->spdif_clk);
547 }
548
549 host->dma_params_tx.addr = res->start + quirks->reg_dac_txdata;
550 host->dma_params_tx.maxburst = 8;
551 host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
552
553 platform_set_drvdata(pdev, host);
554
555 if (quirks->has_reset) {
556 host->rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
557 NULL);
558 if (PTR_ERR(host->rst) == -EPROBE_DEFER) {
559 ret = -EPROBE_DEFER;
560 dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
561 return ret;
562 }
563 if (!IS_ERR(host->rst))
564 reset_control_deassert(host->rst);
565 }
566
567 ret = devm_snd_soc_register_component(&pdev->dev,
568 &sun4i_spdif_component, &sun4i_spdif_dai, 1);
569 if (ret)
570 return ret;
571
572 pm_runtime_enable(&pdev->dev);
573 if (!pm_runtime_enabled(&pdev->dev)) {
574 ret = sun4i_spdif_runtime_resume(&pdev->dev);
575 if (ret)
576 goto err_unregister;
577 }
578
579 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
580 if (ret)
581 goto err_suspend;
582 return 0;
583 err_suspend:
584 if (!pm_runtime_status_suspended(&pdev->dev))
585 sun4i_spdif_runtime_suspend(&pdev->dev);
586 err_unregister:
587 pm_runtime_disable(&pdev->dev);
588 return ret;
589 }
590
591 static int sun4i_spdif_remove(struct platform_device *pdev)
592 {
593 pm_runtime_disable(&pdev->dev);
594 if (!pm_runtime_status_suspended(&pdev->dev))
595 sun4i_spdif_runtime_suspend(&pdev->dev);
596
597 return 0;
598 }
599
600 static const struct dev_pm_ops sun4i_spdif_pm = {
601 SET_RUNTIME_PM_OPS(sun4i_spdif_runtime_suspend,
602 sun4i_spdif_runtime_resume, NULL)
603 };
604
605 static struct platform_driver sun4i_spdif_driver = {
606 .driver = {
607 .name = "sun4i-spdif",
608 .of_match_table = of_match_ptr(sun4i_spdif_of_match),
609 .pm = &sun4i_spdif_pm,
610 },
611 .probe = sun4i_spdif_probe,
612 .remove = sun4i_spdif_remove,
613 };
614
615 module_platform_driver(sun4i_spdif_driver);
616
617 MODULE_AUTHOR("Marcus Cooper <codekipper@gmail.com>");
618 MODULE_AUTHOR("Andrea Venturi <be17068@iperbole.bo.it>");
619 MODULE_DESCRIPTION("Allwinner sun4i SPDIF SoC Interface");
620 MODULE_LICENSE("GPL");
621 MODULE_ALIAS("platform:sun4i-spdif");
Linux with added FPC-III support