1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2012-2013, Analog Devices Inc. |
4 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
5 | */ |
6 | |
7 | #include <linux/init.h> |
8 | #include <linux/kernel.h> |
9 | #include <linux/module.h> |
10 | #include <linux/platform_device.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/of.h> |
13 | #include <linux/clk.h> |
14 | #include <linux/regmap.h> |
15 | |
16 | #include <sound/core.h> |
17 | #include <sound/pcm.h> |
18 | #include <sound/pcm_params.h> |
19 | #include <sound/soc.h> |
20 | #include <sound/initval.h> |
21 | #include <sound/dmaengine_pcm.h> |
22 | |
23 | #define AXI_SPDIF_REG_CTRL 0x0 |
24 | #define AXI_SPDIF_REG_STAT 0x4 |
25 | #define AXI_SPDIF_REG_TX_FIFO 0xc |
26 | |
27 | #define AXI_SPDIF_CTRL_TXDATA BIT(1) |
28 | #define AXI_SPDIF_CTRL_TXEN BIT(0) |
29 | #define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8 |
30 | #define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8) |
31 | |
32 | #define AXI_SPDIF_FREQ_44100 (0x0 << 6) |
33 | #define AXI_SPDIF_FREQ_48000 (0x1 << 6) |
34 | #define AXI_SPDIF_FREQ_32000 (0x2 << 6) |
35 | #define AXI_SPDIF_FREQ_NA (0x3 << 6) |
36 | |
37 | struct axi_spdif { |
38 | struct regmap *regmap; |
39 | struct clk *clk; |
40 | struct clk *clk_ref; |
41 | |
42 | struct snd_dmaengine_dai_dma_data dma_data; |
43 | |
44 | struct snd_ratnum ratnum; |
45 | struct snd_pcm_hw_constraint_ratnums rate_constraints; |
46 | }; |
47 | |
48 | static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd, |
49 | struct snd_soc_dai *dai) |
50 | { |
51 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
52 | unsigned int val; |
53 | |
54 | switch (cmd) { |
55 | case SNDRV_PCM_TRIGGER_START: |
56 | case SNDRV_PCM_TRIGGER_RESUME: |
57 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
58 | val = AXI_SPDIF_CTRL_TXDATA; |
59 | break; |
60 | case SNDRV_PCM_TRIGGER_STOP: |
61 | case SNDRV_PCM_TRIGGER_SUSPEND: |
62 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
63 | val = 0; |
64 | break; |
65 | default: |
66 | return -EINVAL; |
67 | } |
68 | |
69 | regmap_update_bits(map: spdif->regmap, AXI_SPDIF_REG_CTRL, |
70 | AXI_SPDIF_CTRL_TXDATA, val); |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | static int axi_spdif_hw_params(struct snd_pcm_substream *substream, |
76 | struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) |
77 | { |
78 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
79 | unsigned int rate = params_rate(p: params); |
80 | unsigned int clkdiv, stat; |
81 | |
82 | switch (params_rate(p: params)) { |
83 | case 32000: |
84 | stat = AXI_SPDIF_FREQ_32000; |
85 | break; |
86 | case 44100: |
87 | stat = AXI_SPDIF_FREQ_44100; |
88 | break; |
89 | case 48000: |
90 | stat = AXI_SPDIF_FREQ_48000; |
91 | break; |
92 | default: |
93 | stat = AXI_SPDIF_FREQ_NA; |
94 | break; |
95 | } |
96 | |
97 | clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref), |
98 | rate * 64 * 2) - 1; |
99 | clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET; |
100 | |
101 | regmap_write(map: spdif->regmap, AXI_SPDIF_REG_STAT, val: stat); |
102 | regmap_update_bits(map: spdif->regmap, AXI_SPDIF_REG_CTRL, |
103 | AXI_SPDIF_CTRL_CLKDIV_MASK, val: clkdiv); |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | static int axi_spdif_dai_probe(struct snd_soc_dai *dai) |
109 | { |
110 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
111 | |
112 | snd_soc_dai_init_dma_data(dai, playback: &spdif->dma_data, NULL); |
113 | |
114 | return 0; |
115 | } |
116 | |
117 | static int axi_spdif_startup(struct snd_pcm_substream *substream, |
118 | struct snd_soc_dai *dai) |
119 | { |
120 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
121 | int ret; |
122 | |
123 | ret = snd_pcm_hw_constraint_ratnums(runtime: substream->runtime, cond: 0, |
124 | SNDRV_PCM_HW_PARAM_RATE, |
125 | r: &spdif->rate_constraints); |
126 | if (ret) |
127 | return ret; |
128 | |
129 | ret = clk_prepare_enable(clk: spdif->clk_ref); |
130 | if (ret) |
131 | return ret; |
132 | |
133 | regmap_update_bits(map: spdif->regmap, AXI_SPDIF_REG_CTRL, |
134 | AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN); |
135 | |
136 | return 0; |
137 | } |
138 | |
139 | static void axi_spdif_shutdown(struct snd_pcm_substream *substream, |
140 | struct snd_soc_dai *dai) |
141 | { |
142 | struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
143 | |
144 | regmap_update_bits(map: spdif->regmap, AXI_SPDIF_REG_CTRL, |
145 | AXI_SPDIF_CTRL_TXEN, val: 0); |
146 | |
147 | clk_disable_unprepare(clk: spdif->clk_ref); |
148 | } |
149 | |
150 | static const struct snd_soc_dai_ops axi_spdif_dai_ops = { |
151 | .probe = axi_spdif_dai_probe, |
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 | .playback = { |
160 | .channels_min = 2, |
161 | .channels_max = 2, |
162 | .rates = SNDRV_PCM_RATE_KNOT, |
163 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
164 | }, |
165 | .ops = &axi_spdif_dai_ops, |
166 | }; |
167 | |
168 | static const struct snd_soc_component_driver axi_spdif_component = { |
169 | .name = "axi-spdif" , |
170 | .legacy_dai_naming = 1, |
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(dev: &pdev->dev, size: sizeof(*spdif), GFP_KERNEL); |
188 | if (!spdif) |
189 | return -ENOMEM; |
190 | |
191 | platform_set_drvdata(pdev, data: spdif); |
192 | |
193 | base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res); |
194 | if (IS_ERR(ptr: base)) |
195 | return PTR_ERR(ptr: base); |
196 | |
197 | spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base, |
198 | &axi_spdif_regmap_config); |
199 | if (IS_ERR(ptr: spdif->regmap)) |
200 | return PTR_ERR(ptr: spdif->regmap); |
201 | |
202 | spdif->clk = devm_clk_get(dev: &pdev->dev, id: "axi" ); |
203 | if (IS_ERR(ptr: spdif->clk)) |
204 | return PTR_ERR(ptr: spdif->clk); |
205 | |
206 | spdif->clk_ref = devm_clk_get(dev: &pdev->dev, id: "ref" ); |
207 | if (IS_ERR(ptr: spdif->clk_ref)) |
208 | return PTR_ERR(ptr: spdif->clk_ref); |
209 | |
210 | ret = clk_prepare_enable(clk: spdif->clk); |
211 | if (ret) |
212 | return ret; |
213 | |
214 | spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO; |
215 | spdif->dma_data.addr_width = 4; |
216 | spdif->dma_data.maxburst = 1; |
217 | |
218 | spdif->ratnum.num = clk_get_rate(clk: spdif->clk_ref) / 128; |
219 | spdif->ratnum.den_step = 1; |
220 | spdif->ratnum.den_min = 1; |
221 | spdif->ratnum.den_max = 64; |
222 | |
223 | spdif->rate_constraints.rats = &spdif->ratnum; |
224 | spdif->rate_constraints.nrats = 1; |
225 | |
226 | ret = devm_snd_soc_register_component(dev: &pdev->dev, component_driver: &axi_spdif_component, |
227 | dai_drv: &axi_spdif_dai, num_dai: 1); |
228 | if (ret) |
229 | goto err_clk_disable; |
230 | |
231 | ret = devm_snd_dmaengine_pcm_register(dev: &pdev->dev, NULL, flags: 0); |
232 | if (ret) |
233 | goto err_clk_disable; |
234 | |
235 | return 0; |
236 | |
237 | err_clk_disable: |
238 | clk_disable_unprepare(clk: spdif->clk); |
239 | return ret; |
240 | } |
241 | |
242 | static void axi_spdif_dev_remove(struct platform_device *pdev) |
243 | { |
244 | struct axi_spdif *spdif = platform_get_drvdata(pdev); |
245 | |
246 | clk_disable_unprepare(clk: spdif->clk); |
247 | } |
248 | |
249 | static const struct of_device_id axi_spdif_of_match[] = { |
250 | { .compatible = "adi,axi-spdif-tx-1.00.a" , }, |
251 | {}, |
252 | }; |
253 | MODULE_DEVICE_TABLE(of, axi_spdif_of_match); |
254 | |
255 | static struct platform_driver axi_spdif_driver = { |
256 | .driver = { |
257 | .name = "axi-spdif" , |
258 | .of_match_table = axi_spdif_of_match, |
259 | }, |
260 | .probe = axi_spdif_probe, |
261 | .remove_new = axi_spdif_dev_remove, |
262 | }; |
263 | module_platform_driver(axi_spdif_driver); |
264 | |
265 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>" ); |
266 | MODULE_DESCRIPTION("AXI SPDIF driver" ); |
267 | MODULE_LICENSE("GPL" ); |
268 | |