1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015 Linaro
4 *
5 * Author: Jun Nie <jun.nie@linaro.org>
6 */
7
8 #include <linux/clk.h>
9 #include <linux/device.h>
10 #include <linux/dmaengine.h>
11 #include <linux/init.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <sound/asoundef.h>
17 #include <sound/core.h>
18 #include <sound/dmaengine_pcm.h>
19 #include <sound/initval.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
23 #include <sound/soc-dai.h>
24
25 #define ZX_CTRL 0x04
26 #define ZX_FIFOCTRL 0x08
27 #define ZX_INT_STATUS 0x10
28 #define ZX_INT_MASK 0x14
29 #define ZX_DATA 0x18
30 #define ZX_VALID_BIT 0x1c
31 #define ZX_CH_STA_1 0x20
32 #define ZX_CH_STA_2 0x24
33 #define ZX_CH_STA_3 0x28
34 #define ZX_CH_STA_4 0x2c
35 #define ZX_CH_STA_5 0x30
36 #define ZX_CH_STA_6 0x34
37
38 #define ZX_CTRL_MODA_16 (0 << 6)
39 #define ZX_CTRL_MODA_18 BIT(6)
40 #define ZX_CTRL_MODA_20 (2 << 6)
41 #define ZX_CTRL_MODA_24 (3 << 6)
42 #define ZX_CTRL_MODA_MASK (3 << 6)
43
44 #define ZX_CTRL_ENB BIT(4)
45 #define ZX_CTRL_DNB (0 << 4)
46 #define ZX_CTRL_ENB_MASK BIT(4)
47
48 #define ZX_CTRL_TX_OPEN BIT(0)
49 #define ZX_CTRL_TX_CLOSE (0 << 0)
50 #define ZX_CTRL_TX_MASK BIT(0)
51
52 #define ZX_CTRL_OPEN (ZX_CTRL_TX_OPEN | ZX_CTRL_ENB)
53 #define ZX_CTRL_CLOSE (ZX_CTRL_TX_CLOSE | ZX_CTRL_DNB)
54
55 #define ZX_CTRL_DOUBLE_TRACK (0 << 8)
56 #define ZX_CTRL_LEFT_TRACK BIT(8)
57 #define ZX_CTRL_RIGHT_TRACK (2 << 8)
58 #define ZX_CTRL_TRACK_MASK (3 << 8)
59
60 #define ZX_FIFOCTRL_TXTH_MASK (0x1f << 8)
61 #define ZX_FIFOCTRL_TXTH(x) (x << 8)
62 #define ZX_FIFOCTRL_TX_DMA_EN BIT(2)
63 #define ZX_FIFOCTRL_TX_DMA_DIS (0 << 2)
64 #define ZX_FIFOCTRL_TX_DMA_EN_MASK BIT(2)
65 #define ZX_FIFOCTRL_TX_FIFO_RST BIT(0)
66 #define ZX_FIFOCTRL_TX_FIFO_RST_MASK BIT(0)
67
68 #define ZX_VALID_DOUBLE_TRACK (0 << 0)
69 #define ZX_VALID_LEFT_TRACK BIT(1)
70 #define ZX_VALID_RIGHT_TRACK (2 << 0)
71 #define ZX_VALID_TRACK_MASK (3 << 0)
72
73 #define ZX_SPDIF_CLK_RAT (2 * 32)
74
75 struct zx_spdif_info {
76 struct snd_dmaengine_dai_dma_data dma_data;
77 struct clk *dai_clk;
78 void __iomem *reg_base;
79 resource_size_t mapbase;
80 };
81
zx_spdif_dai_probe(struct snd_soc_dai * dai)82 static int zx_spdif_dai_probe(struct snd_soc_dai *dai)
83 {
84 struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
85
86 snd_soc_dai_set_drvdata(dai, zx_spdif);
87 zx_spdif->dma_data.addr = zx_spdif->mapbase + ZX_DATA;
88 zx_spdif->dma_data.maxburst = 8;
89 snd_soc_dai_init_dma_data(dai, &zx_spdif->dma_data, NULL);
90 return 0;
91 }
92
zx_spdif_chanstats(void __iomem * base,unsigned int rate)93 static int zx_spdif_chanstats(void __iomem *base, unsigned int rate)
94 {
95 u32 cstas1;
96
97 switch (rate) {
98 case 22050:
99 cstas1 = IEC958_AES3_CON_FS_22050;
100 break;
101 case 24000:
102 cstas1 = IEC958_AES3_CON_FS_24000;
103 break;
104 case 32000:
105 cstas1 = IEC958_AES3_CON_FS_32000;
106 break;
107 case 44100:
108 cstas1 = IEC958_AES3_CON_FS_44100;
109 break;
110 case 48000:
111 cstas1 = IEC958_AES3_CON_FS_48000;
112 break;
113 case 88200:
114 cstas1 = IEC958_AES3_CON_FS_88200;
115 break;
116 case 96000:
117 cstas1 = IEC958_AES3_CON_FS_96000;
118 break;
119 case 176400:
120 cstas1 = IEC958_AES3_CON_FS_176400;
121 break;
122 case 192000:
123 cstas1 = IEC958_AES3_CON_FS_192000;
124 break;
125 default:
126 return -EINVAL;
127 }
128 cstas1 = cstas1 << 24;
129 cstas1 |= IEC958_AES0_CON_NOT_COPYRIGHT;
130
131 writel_relaxed(cstas1, base + ZX_CH_STA_1);
132 return 0;
133 }
134
zx_spdif_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * socdai)135 static int zx_spdif_hw_params(struct snd_pcm_substream *substream,
136 struct snd_pcm_hw_params *params,
137 struct snd_soc_dai *socdai)
138 {
139 struct zx_spdif_info *zx_spdif = dev_get_drvdata(socdai->dev);
140 struct zx_spdif_info *spdif = snd_soc_dai_get_drvdata(socdai);
141 struct snd_dmaengine_dai_dma_data *dma_data =
142 snd_soc_dai_get_dma_data(socdai, substream);
143 u32 val, ch_num, rate;
144 int ret;
145
146 dma_data->addr_width = params_width(params) >> 3;
147
148 val = readl_relaxed(zx_spdif->reg_base + ZX_CTRL);
149 val &= ~ZX_CTRL_MODA_MASK;
150 switch (params_format(params)) {
151 case SNDRV_PCM_FORMAT_S16_LE:
152 val |= ZX_CTRL_MODA_16;
153 break;
154
155 case SNDRV_PCM_FORMAT_S18_3LE:
156 val |= ZX_CTRL_MODA_18;
157 break;
158
159 case SNDRV_PCM_FORMAT_S20_3LE:
160 val |= ZX_CTRL_MODA_20;
161 break;
162
163 case SNDRV_PCM_FORMAT_S24_LE:
164 val |= ZX_CTRL_MODA_24;
165 break;
166 default:
167 dev_err(socdai->dev, "Format not support!\n");
168 return -EINVAL;
169 }
170
171 ch_num = params_channels(params);
172 if (ch_num == 2)
173 val |= ZX_CTRL_DOUBLE_TRACK;
174 else
175 val |= ZX_CTRL_LEFT_TRACK;
176 writel_relaxed(val, zx_spdif->reg_base + ZX_CTRL);
177
178 val = readl_relaxed(zx_spdif->reg_base + ZX_VALID_BIT);
179 val &= ~ZX_VALID_TRACK_MASK;
180 if (ch_num == 2)
181 val |= ZX_VALID_DOUBLE_TRACK;
182 else
183 val |= ZX_VALID_RIGHT_TRACK;
184 writel_relaxed(val, zx_spdif->reg_base + ZX_VALID_BIT);
185
186 rate = params_rate(params);
187 ret = zx_spdif_chanstats(zx_spdif->reg_base, rate);
188 if (ret)
189 return ret;
190 return clk_set_rate(spdif->dai_clk, rate * ch_num * ZX_SPDIF_CLK_RAT);
191 }
192
zx_spdif_cfg_tx(void __iomem * base,int on)193 static void zx_spdif_cfg_tx(void __iomem *base, int on)
194 {
195 u32 val;
196
197 val = readl_relaxed(base + ZX_CTRL);
198 val &= ~(ZX_CTRL_ENB_MASK | ZX_CTRL_TX_MASK);
199 val |= on ? ZX_CTRL_OPEN : ZX_CTRL_CLOSE;
200 writel_relaxed(val, base + ZX_CTRL);
201
202 val = readl_relaxed(base + ZX_FIFOCTRL);
203 val &= ~ZX_FIFOCTRL_TX_DMA_EN_MASK;
204 if (on)
205 val |= ZX_FIFOCTRL_TX_DMA_EN;
206 writel_relaxed(val, base + ZX_FIFOCTRL);
207 }
208
zx_spdif_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)209 static int zx_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
210 struct snd_soc_dai *dai)
211 {
212 u32 val;
213 struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
214 int ret = 0;
215
216 switch (cmd) {
217 case SNDRV_PCM_TRIGGER_START:
218 val = readl_relaxed(zx_spdif->reg_base + ZX_FIFOCTRL);
219 val |= ZX_FIFOCTRL_TX_FIFO_RST;
220 writel_relaxed(val, zx_spdif->reg_base + ZX_FIFOCTRL);
221 fallthrough;
222 case SNDRV_PCM_TRIGGER_RESUME:
223 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
224 zx_spdif_cfg_tx(zx_spdif->reg_base, true);
225 break;
226
227 case SNDRV_PCM_TRIGGER_STOP:
228 case SNDRV_PCM_TRIGGER_SUSPEND:
229 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
230 zx_spdif_cfg_tx(zx_spdif->reg_base, false);
231 break;
232
233 default:
234 ret = -EINVAL;
235 break;
236 }
237
238 return ret;
239 }
240
zx_spdif_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)241 static int zx_spdif_startup(struct snd_pcm_substream *substream,
242 struct snd_soc_dai *dai)
243 {
244 struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
245
246 return clk_prepare_enable(zx_spdif->dai_clk);
247 }
248
zx_spdif_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)249 static void zx_spdif_shutdown(struct snd_pcm_substream *substream,
250 struct snd_soc_dai *dai)
251 {
252 struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
253
254 clk_disable_unprepare(zx_spdif->dai_clk);
255 }
256
257 #define ZX_RATES \
258 (SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
259 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |\
260 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)
261
262 #define ZX_FORMAT \
263 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE \
264 | SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE)
265
266 static const struct snd_soc_dai_ops zx_spdif_dai_ops = {
267 .trigger = zx_spdif_trigger,
268 .startup = zx_spdif_startup,
269 .shutdown = zx_spdif_shutdown,
270 .hw_params = zx_spdif_hw_params,
271 };
272
273 static struct snd_soc_dai_driver zx_spdif_dai = {
274 .name = "spdif",
275 .id = 0,
276 .probe = zx_spdif_dai_probe,
277 .playback = {
278 .channels_min = 1,
279 .channels_max = 2,
280 .rates = ZX_RATES,
281 .formats = ZX_FORMAT,
282 },
283 .ops = &zx_spdif_dai_ops,
284 };
285
286 static const struct snd_soc_component_driver zx_spdif_component = {
287 .name = "spdif",
288 };
289
zx_spdif_dev_init(void __iomem * base)290 static void zx_spdif_dev_init(void __iomem *base)
291 {
292 u32 val;
293
294 writel_relaxed(0, base + ZX_CTRL);
295 writel_relaxed(0, base + ZX_INT_MASK);
296 writel_relaxed(0xf, base + ZX_INT_STATUS);
297 writel_relaxed(0x1, base + ZX_FIFOCTRL);
298
299 val = readl_relaxed(base + ZX_FIFOCTRL);
300 val &= ~(ZX_FIFOCTRL_TXTH_MASK | ZX_FIFOCTRL_TX_FIFO_RST_MASK);
301 val |= ZX_FIFOCTRL_TXTH(8);
302 writel_relaxed(val, base + ZX_FIFOCTRL);
303 }
304
zx_spdif_probe(struct platform_device * pdev)305 static int zx_spdif_probe(struct platform_device *pdev)
306 {
307 struct resource *res;
308 struct zx_spdif_info *zx_spdif;
309 int ret;
310
311 zx_spdif = devm_kzalloc(&pdev->dev, sizeof(*zx_spdif), GFP_KERNEL);
312 if (!zx_spdif)
313 return -ENOMEM;
314
315 zx_spdif->dai_clk = devm_clk_get(&pdev->dev, "tx");
316 if (IS_ERR(zx_spdif->dai_clk)) {
317 dev_err(&pdev->dev, "Fail to get clk\n");
318 return PTR_ERR(zx_spdif->dai_clk);
319 }
320
321 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
322 zx_spdif->mapbase = res->start;
323 zx_spdif->reg_base = devm_ioremap_resource(&pdev->dev, res);
324 if (IS_ERR(zx_spdif->reg_base)) {
325 return PTR_ERR(zx_spdif->reg_base);
326 }
327
328 zx_spdif_dev_init(zx_spdif->reg_base);
329 platform_set_drvdata(pdev, zx_spdif);
330
331 ret = devm_snd_soc_register_component(&pdev->dev, &zx_spdif_component,
332 &zx_spdif_dai, 1);
333 if (ret) {
334 dev_err(&pdev->dev, "Register DAI failed: %d\n", ret);
335 return ret;
336 }
337
338 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
339 if (ret)
340 dev_err(&pdev->dev, "Register platform PCM failed: %d\n", ret);
341
342 return ret;
343 }
344
345 static const struct of_device_id zx_spdif_dt_ids[] = {
346 { .compatible = "zte,zx296702-spdif", },
347 {}
348 };
349 MODULE_DEVICE_TABLE(of, zx_spdif_dt_ids);
350
351 static struct platform_driver spdif_driver = {
352 .probe = zx_spdif_probe,
353 .driver = {
354 .name = "zx-spdif",
355 .of_match_table = zx_spdif_dt_ids,
356 },
357 };
358
359 module_platform_driver(spdif_driver);
360
361 MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
362 MODULE_DESCRIPTION("ZTE SPDIF SoC DAI");
363 MODULE_LICENSE("GPL");
364