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429e4374 LPC |
1 | /* |
2 | * Copyright (C) 2012-2013, Analog Devices Inc. | |
3 | * Author: Lars-Peter Clausen <lars@metafoo.de> | |
4 | * | |
5 | * Licensed under the GPL-2. | |
6 | */ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/clk.h> | |
15 | #include <linux/regmap.h> | |
16 | ||
17 | #include <sound/core.h> | |
18 | #include <sound/pcm.h> | |
19 | #include <sound/pcm_params.h> | |
20 | #include <sound/soc.h> | |
21 | #include <sound/initval.h> | |
22 | #include <sound/dmaengine_pcm.h> | |
23 | ||
24 | #define AXI_SPDIF_REG_CTRL 0x0 | |
25 | #define AXI_SPDIF_REG_STAT 0x4 | |
26 | #define AXI_SPDIF_REG_TX_FIFO 0xc | |
27 | ||
28 | #define AXI_SPDIF_CTRL_TXDATA BIT(1) | |
29 | #define AXI_SPDIF_CTRL_TXEN BIT(0) | |
30 | #define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8 | |
31 | #define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8) | |
32 | ||
33 | #define AXI_SPDIF_FREQ_44100 (0x0 << 6) | |
34 | #define AXI_SPDIF_FREQ_48000 (0x1 << 6) | |
35 | #define AXI_SPDIF_FREQ_32000 (0x2 << 6) | |
36 | #define AXI_SPDIF_FREQ_NA (0x3 << 6) | |
37 | ||
38 | struct axi_spdif { | |
39 | struct regmap *regmap; | |
40 | struct clk *clk; | |
41 | struct clk *clk_ref; | |
42 | ||
43 | struct snd_dmaengine_dai_dma_data dma_data; | |
44 | ||
45 | struct snd_ratnum ratnum; | |
46 | struct snd_pcm_hw_constraint_ratnums rate_constraints; | |
47 | }; | |
48 | ||
49 | static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd, | |
50 | struct snd_soc_dai *dai) | |
51 | { | |
52 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); | |
53 | unsigned int val; | |
54 | ||
55 | switch (cmd) { | |
56 | case SNDRV_PCM_TRIGGER_START: | |
57 | case SNDRV_PCM_TRIGGER_RESUME: | |
58 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
59 | val = AXI_SPDIF_CTRL_TXDATA; | |
60 | break; | |
61 | case SNDRV_PCM_TRIGGER_STOP: | |
62 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
63 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
64 | val = 0; | |
65 | break; | |
66 | default: | |
67 | return -EINVAL; | |
68 | } | |
69 | ||
70 | regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, | |
71 | AXI_SPDIF_CTRL_TXDATA, val); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static int axi_spdif_hw_params(struct snd_pcm_substream *substream, | |
77 | struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) | |
78 | { | |
79 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); | |
80 | unsigned int rate = params_rate(params); | |
81 | unsigned int clkdiv, stat; | |
82 | ||
83 | switch (params_rate(params)) { | |
84 | case 32000: | |
85 | stat = AXI_SPDIF_FREQ_32000; | |
86 | break; | |
87 | case 44100: | |
88 | stat = AXI_SPDIF_FREQ_44100; | |
89 | break; | |
90 | case 48000: | |
91 | stat = AXI_SPDIF_FREQ_48000; | |
92 | break; | |
93 | default: | |
94 | stat = AXI_SPDIF_FREQ_NA; | |
95 | break; | |
96 | } | |
97 | ||
98 | clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref), | |
99 | rate * 64 * 2) - 1; | |
100 | clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET; | |
101 | ||
102 | regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat); | |
103 | regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, | |
104 | AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int axi_spdif_dai_probe(struct snd_soc_dai *dai) | |
110 | { | |
111 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); | |
112 | ||
113 | snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static int axi_spdif_startup(struct snd_pcm_substream *substream, | |
119 | struct snd_soc_dai *dai) | |
120 | { | |
121 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); | |
122 | int ret; | |
123 | ||
124 | ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, | |
125 | SNDRV_PCM_HW_PARAM_RATE, | |
126 | &spdif->rate_constraints); | |
127 | if (ret) | |
128 | return ret; | |
129 | ||
130 | ret = clk_prepare_enable(spdif->clk_ref); | |
131 | if (ret) | |
132 | return ret; | |
133 | ||
134 | regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, | |
135 | AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static void axi_spdif_shutdown(struct snd_pcm_substream *substream, | |
141 | struct snd_soc_dai *dai) | |
142 | { | |
143 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); | |
144 | ||
145 | regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, | |
146 | AXI_SPDIF_CTRL_TXEN, 0); | |
147 | ||
148 | clk_disable_unprepare(spdif->clk_ref); | |
149 | } | |
150 | ||
151 | static const struct snd_soc_dai_ops axi_spdif_dai_ops = { | |
152 | .startup = axi_spdif_startup, | |
153 | .shutdown = axi_spdif_shutdown, | |
154 | .trigger = axi_spdif_trigger, | |
155 | .hw_params = axi_spdif_hw_params, | |
156 | }; | |
157 | ||
158 | static struct snd_soc_dai_driver axi_spdif_dai = { | |
159 | .probe = axi_spdif_dai_probe, | |
160 | .playback = { | |
161 | .channels_min = 2, | |
162 | .channels_max = 2, | |
163 | .rates = SNDRV_PCM_RATE_KNOT, | |
164 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
165 | }, | |
166 | .ops = &axi_spdif_dai_ops, | |
167 | }; | |
168 | ||
169 | static const struct snd_soc_component_driver axi_spdif_component = { | |
170 | .name = "axi-spdif", | |
171 | }; | |
172 | ||
173 | static const struct regmap_config axi_spdif_regmap_config = { | |
174 | .reg_bits = 32, | |
175 | .reg_stride = 4, | |
176 | .val_bits = 32, | |
177 | .max_register = AXI_SPDIF_REG_STAT, | |
178 | }; | |
179 | ||
180 | static int axi_spdif_probe(struct platform_device *pdev) | |
181 | { | |
182 | struct axi_spdif *spdif; | |
183 | struct resource *res; | |
184 | void __iomem *base; | |
185 | int ret; | |
186 | ||
187 | spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); | |
188 | if (!spdif) | |
189 | return -ENOMEM; | |
190 | ||
191 | platform_set_drvdata(pdev, spdif); | |
192 | ||
193 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
bbe58030 FW |
194 | base = devm_ioremap_resource(&pdev->dev, res); |
195 | if (IS_ERR(base)) | |
196 | return PTR_ERR(base); | |
429e4374 LPC |
197 | |
198 | spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base, | |
199 | &axi_spdif_regmap_config); | |
200 | if (IS_ERR(spdif->regmap)) | |
201 | return PTR_ERR(spdif->regmap); | |
202 | ||
203 | spdif->clk = devm_clk_get(&pdev->dev, "axi"); | |
204 | if (IS_ERR(spdif->clk)) | |
205 | return PTR_ERR(spdif->clk); | |
206 | ||
207 | spdif->clk_ref = devm_clk_get(&pdev->dev, "ref"); | |
208 | if (IS_ERR(spdif->clk_ref)) | |
209 | return PTR_ERR(spdif->clk_ref); | |
210 | ||
211 | ret = clk_prepare_enable(spdif->clk); | |
212 | if (ret) | |
213 | return ret; | |
214 | ||
215 | spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO; | |
216 | spdif->dma_data.addr_width = 4; | |
217 | spdif->dma_data.maxburst = 1; | |
218 | ||
219 | spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128; | |
220 | spdif->ratnum.den_step = 1; | |
221 | spdif->ratnum.den_min = 1; | |
222 | spdif->ratnum.den_max = 64; | |
223 | ||
224 | spdif->rate_constraints.rats = &spdif->ratnum; | |
225 | spdif->rate_constraints.nrats = 1; | |
226 | ||
227 | ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component, | |
228 | &axi_spdif_dai, 1); | |
229 | if (ret) | |
230 | goto err_clk_disable; | |
231 | ||
153e66f5 | 232 | ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); |
429e4374 LPC |
233 | if (ret) |
234 | goto err_clk_disable; | |
235 | ||
236 | return 0; | |
237 | ||
238 | err_clk_disable: | |
239 | clk_disable_unprepare(spdif->clk); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | static int axi_spdif_dev_remove(struct platform_device *pdev) | |
244 | { | |
245 | struct axi_spdif *spdif = platform_get_drvdata(pdev); | |
246 | ||
247 | clk_disable_unprepare(spdif->clk); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static const struct of_device_id axi_spdif_of_match[] = { | |
253 | { .compatible = "adi,axi-spdif-tx-1.00.a", }, | |
254 | {}, | |
255 | }; | |
256 | MODULE_DEVICE_TABLE(of, axi_spdif_of_match); | |
257 | ||
258 | static struct platform_driver axi_spdif_driver = { | |
259 | .driver = { | |
260 | .name = "axi-spdif", | |
429e4374 LPC |
261 | .of_match_table = axi_spdif_of_match, |
262 | }, | |
263 | .probe = axi_spdif_probe, | |
264 | .remove = axi_spdif_dev_remove, | |
265 | }; | |
266 | module_platform_driver(axi_spdif_driver); | |
267 | ||
268 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
269 | MODULE_DESCRIPTION("AXI SPDIF driver"); | |
270 | MODULE_LICENSE("GPL"); |