]>
Commit | Line | Data |
---|---|---|
8f2fe346 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/clk.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/regmap.h> | |
15 | #include <linux/slab.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/dmaengine_pcm.h> | |
22 | ||
23 | #define AXI_I2S_REG_RESET 0x00 | |
24 | #define AXI_I2S_REG_CTRL 0x04 | |
25 | #define AXI_I2S_REG_CLK_CTRL 0x08 | |
26 | #define AXI_I2S_REG_STATUS 0x10 | |
27 | ||
28 | #define AXI_I2S_REG_RX_FIFO 0x28 | |
29 | #define AXI_I2S_REG_TX_FIFO 0x2C | |
30 | ||
31 | #define AXI_I2S_RESET_GLOBAL BIT(0) | |
32 | #define AXI_I2S_RESET_TX_FIFO BIT(1) | |
33 | #define AXI_I2S_RESET_RX_FIFO BIT(2) | |
34 | ||
35 | #define AXI_I2S_CTRL_TX_EN BIT(0) | |
36 | #define AXI_I2S_CTRL_RX_EN BIT(1) | |
37 | ||
38 | /* The frame size is configurable, but for now we always set it 64 bit */ | |
39 | #define AXI_I2S_BITS_PER_FRAME 64 | |
40 | ||
41 | struct axi_i2s { | |
42 | struct regmap *regmap; | |
43 | struct clk *clk; | |
44 | struct clk *clk_ref; | |
45 | ||
46 | struct snd_soc_dai_driver dai_driver; | |
47 | ||
48 | struct snd_dmaengine_dai_dma_data capture_dma_data; | |
49 | struct snd_dmaengine_dai_dma_data playback_dma_data; | |
50 | ||
51 | struct snd_ratnum ratnum; | |
52 | struct snd_pcm_hw_constraint_ratnums rate_constraints; | |
53 | }; | |
54 | ||
55 | static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd, | |
56 | struct snd_soc_dai *dai) | |
57 | { | |
58 | struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); | |
59 | unsigned int mask, val; | |
60 | ||
61 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
62 | mask = AXI_I2S_CTRL_RX_EN; | |
63 | else | |
64 | mask = AXI_I2S_CTRL_TX_EN; | |
65 | ||
66 | switch (cmd) { | |
67 | case SNDRV_PCM_TRIGGER_START: | |
68 | case SNDRV_PCM_TRIGGER_RESUME: | |
69 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
70 | val = mask; | |
71 | break; | |
72 | case SNDRV_PCM_TRIGGER_STOP: | |
73 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
74 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
75 | val = 0; | |
76 | break; | |
77 | default: | |
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int axi_i2s_hw_params(struct snd_pcm_substream *substream, | |
87 | struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) | |
88 | { | |
89 | struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); | |
90 | unsigned int bclk_div, word_size; | |
91 | unsigned int bclk_rate; | |
92 | ||
93 | bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME; | |
94 | ||
95 | word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1; | |
96 | bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1; | |
97 | ||
98 | regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) | | |
99 | bclk_div); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int axi_i2s_startup(struct snd_pcm_substream *substream, | |
105 | struct snd_soc_dai *dai) | |
106 | { | |
107 | struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); | |
108 | uint32_t mask; | |
109 | int ret; | |
110 | ||
111 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
112 | mask = AXI_I2S_RESET_RX_FIFO; | |
113 | else | |
114 | mask = AXI_I2S_RESET_TX_FIFO; | |
115 | ||
116 | regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask); | |
117 | ||
118 | ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, | |
119 | SNDRV_PCM_HW_PARAM_RATE, | |
120 | &i2s->rate_constraints); | |
121 | if (ret) | |
122 | return ret; | |
123 | ||
124 | return clk_prepare_enable(i2s->clk_ref); | |
125 | } | |
126 | ||
127 | static void axi_i2s_shutdown(struct snd_pcm_substream *substream, | |
128 | struct snd_soc_dai *dai) | |
129 | { | |
130 | struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); | |
131 | ||
132 | clk_disable_unprepare(i2s->clk_ref); | |
133 | } | |
134 | ||
135 | static int axi_i2s_dai_probe(struct snd_soc_dai *dai) | |
136 | { | |
137 | struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); | |
138 | ||
139 | snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data, | |
140 | &i2s->capture_dma_data); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static const struct snd_soc_dai_ops axi_i2s_dai_ops = { | |
146 | .startup = axi_i2s_startup, | |
147 | .shutdown = axi_i2s_shutdown, | |
148 | .trigger = axi_i2s_trigger, | |
149 | .hw_params = axi_i2s_hw_params, | |
150 | }; | |
151 | ||
152 | static struct snd_soc_dai_driver axi_i2s_dai = { | |
153 | .probe = axi_i2s_dai_probe, | |
154 | .playback = { | |
155 | .channels_min = 2, | |
156 | .channels_max = 2, | |
157 | .rates = SNDRV_PCM_RATE_KNOT, | |
158 | .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE, | |
159 | }, | |
160 | .capture = { | |
161 | .channels_min = 2, | |
162 | .channels_max = 2, | |
163 | .rates = SNDRV_PCM_RATE_KNOT, | |
164 | .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE, | |
165 | }, | |
166 | .ops = &axi_i2s_dai_ops, | |
167 | .symmetric_rates = 1, | |
168 | }; | |
169 | ||
170 | static const struct snd_soc_component_driver axi_i2s_component = { | |
171 | .name = "axi-i2s", | |
172 | }; | |
173 | ||
174 | static const struct regmap_config axi_i2s_regmap_config = { | |
175 | .reg_bits = 32, | |
176 | .reg_stride = 4, | |
177 | .val_bits = 32, | |
178 | .max_register = AXI_I2S_REG_STATUS, | |
179 | }; | |
180 | ||
181 | static int axi_i2s_probe(struct platform_device *pdev) | |
182 | { | |
183 | struct resource *res; | |
184 | struct axi_i2s *i2s; | |
185 | void __iomem *base; | |
186 | int ret; | |
187 | ||
188 | i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL); | |
189 | if (!i2s) | |
190 | return -ENOMEM; | |
191 | ||
192 | platform_set_drvdata(pdev, i2s); | |
193 | ||
194 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
7fd7a48b FW |
195 | base = devm_ioremap_resource(&pdev->dev, res); |
196 | if (IS_ERR(base)) | |
197 | return PTR_ERR(base); | |
8f2fe346 LPC |
198 | |
199 | i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base, | |
200 | &axi_i2s_regmap_config); | |
201 | if (IS_ERR(i2s->regmap)) | |
202 | return PTR_ERR(i2s->regmap); | |
203 | ||
204 | i2s->clk = devm_clk_get(&pdev->dev, "axi"); | |
205 | if (IS_ERR(i2s->clk)) | |
206 | return PTR_ERR(i2s->clk); | |
207 | ||
208 | i2s->clk_ref = devm_clk_get(&pdev->dev, "ref"); | |
209 | if (IS_ERR(i2s->clk_ref)) | |
210 | return PTR_ERR(i2s->clk_ref); | |
211 | ||
212 | ret = clk_prepare_enable(i2s->clk); | |
213 | if (ret) | |
214 | return ret; | |
215 | ||
216 | i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO; | |
217 | i2s->playback_dma_data.addr_width = 4; | |
218 | i2s->playback_dma_data.maxburst = 1; | |
219 | ||
220 | i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO; | |
221 | i2s->capture_dma_data.addr_width = 4; | |
222 | i2s->capture_dma_data.maxburst = 1; | |
223 | ||
224 | i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME; | |
225 | i2s->ratnum.den_step = 1; | |
226 | i2s->ratnum.den_min = 1; | |
227 | i2s->ratnum.den_max = 64; | |
228 | ||
229 | i2s->rate_constraints.rats = &i2s->ratnum; | |
230 | i2s->rate_constraints.nrats = 1; | |
231 | ||
232 | regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL); | |
233 | ||
234 | ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component, | |
235 | &axi_i2s_dai, 1); | |
236 | if (ret) | |
237 | goto err_clk_disable; | |
238 | ||
153e66f5 | 239 | ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); |
8f2fe346 LPC |
240 | if (ret) |
241 | goto err_clk_disable; | |
242 | ||
ae6f636b AJ |
243 | return 0; |
244 | ||
8f2fe346 LPC |
245 | err_clk_disable: |
246 | clk_disable_unprepare(i2s->clk); | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int axi_i2s_dev_remove(struct platform_device *pdev) | |
251 | { | |
252 | struct axi_i2s *i2s = platform_get_drvdata(pdev); | |
253 | ||
254 | clk_disable_unprepare(i2s->clk); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static const struct of_device_id axi_i2s_of_match[] = { | |
260 | { .compatible = "adi,axi-i2s-1.00.a", }, | |
261 | {}, | |
262 | }; | |
263 | MODULE_DEVICE_TABLE(of, axi_i2s_of_match); | |
264 | ||
265 | static struct platform_driver axi_i2s_driver = { | |
266 | .driver = { | |
267 | .name = "axi-i2s", | |
8f2fe346 LPC |
268 | .of_match_table = axi_i2s_of_match, |
269 | }, | |
270 | .probe = axi_i2s_probe, | |
271 | .remove = axi_i2s_dev_remove, | |
272 | }; | |
273 | module_platform_driver(axi_i2s_driver); | |
274 | ||
275 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
276 | MODULE_DESCRIPTION("AXI I2S driver"); | |
277 | MODULE_LICENSE("GPL"); |