1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* Atmel PDMIC driver |
3 | * |
4 | * Copyright (C) 2015 Atmel |
5 | * |
6 | * Author: Songjun Wu <songjun.wu@atmel.com> |
7 | */ |
8 | |
9 | #include <linux/of.h> |
10 | #include <linux/clk.h> |
11 | #include <linux/module.h> |
12 | #include <linux/platform_device.h> |
13 | #include <linux/regmap.h> |
14 | #include <sound/core.h> |
15 | #include <sound/dmaengine_pcm.h> |
16 | #include <sound/pcm_params.h> |
17 | #include <sound/tlv.h> |
18 | #include "atmel-pdmic.h" |
19 | |
20 | struct atmel_pdmic_pdata { |
21 | u32 mic_min_freq; |
22 | u32 mic_max_freq; |
23 | s32 mic_offset; |
24 | const char *card_name; |
25 | }; |
26 | |
27 | struct atmel_pdmic { |
28 | dma_addr_t phy_base; |
29 | struct regmap *regmap; |
30 | struct clk *pclk; |
31 | struct clk *gclk; |
32 | struct device *dev; |
33 | int irq; |
34 | struct snd_pcm_substream *substream; |
35 | const struct atmel_pdmic_pdata *pdata; |
36 | }; |
37 | |
38 | static const struct of_device_id atmel_pdmic_of_match[] = { |
39 | { |
40 | .compatible = "atmel,sama5d2-pdmic" , |
41 | }, { |
42 | /* sentinel */ |
43 | } |
44 | }; |
45 | MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match); |
46 | |
47 | #define PDMIC_OFFSET_MAX_VAL S16_MAX |
48 | #define PDMIC_OFFSET_MIN_VAL S16_MIN |
49 | |
50 | static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev) |
51 | { |
52 | struct device_node *np = dev->of_node; |
53 | struct atmel_pdmic_pdata *pdata; |
54 | |
55 | if (!np) { |
56 | dev_err(dev, "device node not found\n" ); |
57 | return ERR_PTR(error: -EINVAL); |
58 | } |
59 | |
60 | pdata = devm_kzalloc(dev, size: sizeof(*pdata), GFP_KERNEL); |
61 | if (!pdata) |
62 | return ERR_PTR(error: -ENOMEM); |
63 | |
64 | if (of_property_read_string(np, propname: "atmel,model" , out_string: &pdata->card_name)) |
65 | pdata->card_name = "PDMIC" ; |
66 | |
67 | if (of_property_read_u32(np, propname: "atmel,mic-min-freq" , |
68 | out_value: &pdata->mic_min_freq)) { |
69 | dev_err(dev, "failed to get mic-min-freq\n" ); |
70 | return ERR_PTR(error: -EINVAL); |
71 | } |
72 | |
73 | if (of_property_read_u32(np, propname: "atmel,mic-max-freq" , |
74 | out_value: &pdata->mic_max_freq)) { |
75 | dev_err(dev, "failed to get mic-max-freq\n" ); |
76 | return ERR_PTR(error: -EINVAL); |
77 | } |
78 | |
79 | if (pdata->mic_max_freq < pdata->mic_min_freq) { |
80 | dev_err(dev, |
81 | "mic-max-freq should not be less than mic-min-freq\n" ); |
82 | return ERR_PTR(error: -EINVAL); |
83 | } |
84 | |
85 | if (of_property_read_s32(np, propname: "atmel,mic-offset" , out_value: &pdata->mic_offset)) |
86 | pdata->mic_offset = 0; |
87 | |
88 | if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) { |
89 | dev_warn(dev, |
90 | "mic-offset value %d is larger than the max value %d, the max value is specified\n" , |
91 | pdata->mic_offset, PDMIC_OFFSET_MAX_VAL); |
92 | pdata->mic_offset = PDMIC_OFFSET_MAX_VAL; |
93 | } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) { |
94 | dev_warn(dev, |
95 | "mic-offset value %d is less than the min value %d, the min value is specified\n" , |
96 | pdata->mic_offset, PDMIC_OFFSET_MIN_VAL); |
97 | pdata->mic_offset = PDMIC_OFFSET_MIN_VAL; |
98 | } |
99 | |
100 | return pdata; |
101 | } |
102 | |
103 | /* cpu dai component */ |
104 | static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream, |
105 | struct snd_soc_dai *cpu_dai) |
106 | { |
107 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
108 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card: rtd->card); |
109 | int ret; |
110 | |
111 | ret = clk_prepare_enable(clk: dd->gclk); |
112 | if (ret) |
113 | return ret; |
114 | |
115 | ret = clk_prepare_enable(clk: dd->pclk); |
116 | if (ret) { |
117 | clk_disable_unprepare(clk: dd->gclk); |
118 | return ret; |
119 | } |
120 | |
121 | /* Clear all bits in the Control Register(PDMIC_CR) */ |
122 | regmap_write(map: dd->regmap, PDMIC_CR, val: 0); |
123 | |
124 | dd->substream = substream; |
125 | |
126 | /* Enable the overrun error interrupt */ |
127 | regmap_write(map: dd->regmap, PDMIC_IER, PDMIC_IER_OVRE); |
128 | |
129 | return 0; |
130 | } |
131 | |
132 | static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream, |
133 | struct snd_soc_dai *cpu_dai) |
134 | { |
135 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
136 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card: rtd->card); |
137 | |
138 | /* Disable the overrun error interrupt */ |
139 | regmap_write(map: dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE); |
140 | |
141 | clk_disable_unprepare(clk: dd->gclk); |
142 | clk_disable_unprepare(clk: dd->pclk); |
143 | } |
144 | |
145 | static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream, |
146 | struct snd_soc_dai *cpu_dai) |
147 | { |
148 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
149 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card: rtd->card); |
150 | struct snd_soc_component *component = cpu_dai->component; |
151 | u32 val; |
152 | int ret; |
153 | |
154 | /* Clean the PDMIC Converted Data Register */ |
155 | ret = regmap_read(map: dd->regmap, PDMIC_CDR, val: &val); |
156 | if (ret < 0) |
157 | return 0; |
158 | |
159 | ret = snd_soc_component_update_bits(component, PDMIC_CR, |
160 | PDMIC_CR_ENPDM_MASK, |
161 | PDMIC_CR_ENPDM_DIS << |
162 | PDMIC_CR_ENPDM_SHIFT); |
163 | if (ret < 0) |
164 | return ret; |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | #define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE) |
170 | |
171 | /* platform */ |
172 | #define ATMEL_PDMIC_MAX_BUF_SIZE (64 * 1024) |
173 | #define ATMEL_PDMIC_PREALLOC_BUF_SIZE ATMEL_PDMIC_MAX_BUF_SIZE |
174 | |
175 | static const struct snd_pcm_hardware atmel_pdmic_hw = { |
176 | .info = SNDRV_PCM_INFO_MMAP |
177 | | SNDRV_PCM_INFO_MMAP_VALID |
178 | | SNDRV_PCM_INFO_INTERLEAVED |
179 | | SNDRV_PCM_INFO_RESUME |
180 | | SNDRV_PCM_INFO_PAUSE, |
181 | .formats = ATMEL_PDMIC_FORMATS, |
182 | .buffer_bytes_max = ATMEL_PDMIC_MAX_BUF_SIZE, |
183 | .period_bytes_min = 256, |
184 | .period_bytes_max = 32 * 1024, |
185 | .periods_min = 2, |
186 | .periods_max = 256, |
187 | }; |
188 | |
189 | static int |
190 | atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream, |
191 | struct snd_pcm_hw_params *params, |
192 | struct dma_slave_config *slave_config) |
193 | { |
194 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
195 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card: rtd->card); |
196 | int ret; |
197 | |
198 | ret = snd_hwparams_to_dma_slave_config(substream, params, |
199 | slave_config); |
200 | if (ret) { |
201 | dev_err(dd->dev, |
202 | "hw params to dma slave configure failed\n" ); |
203 | return ret; |
204 | } |
205 | |
206 | slave_config->src_addr = dd->phy_base + PDMIC_CDR; |
207 | slave_config->src_maxburst = 1; |
208 | slave_config->dst_maxburst = 1; |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | static const struct snd_dmaengine_pcm_config |
214 | atmel_pdmic_dmaengine_pcm_config = { |
215 | .prepare_slave_config = atmel_pdmic_platform_configure_dma, |
216 | .pcm_hardware = &atmel_pdmic_hw, |
217 | .prealloc_buffer_size = ATMEL_PDMIC_PREALLOC_BUF_SIZE, |
218 | }; |
219 | |
220 | /* codec */ |
221 | /* Mic Gain = dgain * 2^(-scale) */ |
222 | struct mic_gain { |
223 | unsigned int dgain; |
224 | unsigned int scale; |
225 | }; |
226 | |
227 | /* range from -90 dB to 90 dB */ |
228 | static const struct mic_gain mic_gain_table[] = { |
229 | { 1, 15}, { 1, 14}, /* -90, -84 dB */ |
230 | { 3, 15}, { 1, 13}, { 3, 14}, { 1, 12}, /* -81, -78, -75, -72 dB */ |
231 | { 5, 14}, { 13, 15}, /* -70, -68 dB */ |
232 | { 9, 14}, { 21, 15}, { 23, 15}, { 13, 14}, /* -65 ~ -62 dB */ |
233 | { 29, 15}, { 33, 15}, { 37, 15}, { 41, 15}, /* -61 ~ -58 dB */ |
234 | { 23, 14}, { 13, 13}, { 58, 15}, { 65, 15}, /* -57 ~ -54 dB */ |
235 | { 73, 15}, { 41, 14}, { 23, 13}, { 13, 12}, /* -53 ~ -50 dB */ |
236 | { 29, 13}, { 65, 14}, { 73, 14}, { 41, 13}, /* -49 ~ -46 dB */ |
237 | { 23, 12}, { 207, 15}, { 29, 12}, { 65, 13}, /* -45 ~ -42 dB */ |
238 | { 73, 13}, { 41, 12}, { 23, 11}, { 413, 15}, /* -41 ~ -38 dB */ |
239 | { 463, 15}, { 519, 15}, { 583, 15}, { 327, 14}, /* -37 ~ -34 dB */ |
240 | { 367, 14}, { 823, 15}, { 231, 13}, { 1036, 15}, /* -33 ~ -30 dB */ |
241 | { 1163, 15}, { 1305, 15}, { 183, 12}, { 1642, 15}, /* -29 ~ -26 dB */ |
242 | { 1843, 15}, { 2068, 15}, { 145, 11}, { 2603, 15}, /* -25 ~ -22 dB */ |
243 | { 365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */ |
244 | { 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */ |
245 | { 917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */ |
246 | {11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /* -9 ~ -6 dB */ |
247 | {18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /* -5 ~ -2 dB */ |
248 | { 7301, 13}, { 1, 0}, {18383, 14}, {10313, 13}, /* -1 ~ 2 dB */ |
249 | {23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /* 3 ~ 6 dB */ |
250 | { 4585, 11}, {20577, 13}, { 1443, 9}, {25905, 13}, /* 7 ~ 10 dB */ |
251 | {14533, 12}, { 8153, 11}, { 2287, 9}, {20529, 12}, /* 11 ~ 14 dB */ |
252 | {11517, 11}, { 6461, 10}, {28997, 12}, { 4067, 9}, /* 15 ~ 18 dB */ |
253 | {18253, 11}, { 10, 0}, {22979, 11}, {25783, 11}, /* 19 ~ 22 dB */ |
254 | {28929, 11}, {32459, 11}, { 9105, 9}, {20431, 10}, /* 23 ~ 26 dB */ |
255 | {22925, 10}, {12861, 9}, { 7215, 8}, {16191, 9}, /* 27 ~ 30 dB */ |
256 | { 9083, 8}, {20383, 9}, {11435, 8}, { 6145, 7}, /* 31 ~ 34 dB */ |
257 | { 3599, 6}, {32305, 9}, {18123, 8}, {20335, 8}, /* 35 ~ 38 dB */ |
258 | { 713, 3}, { 100, 0}, { 7181, 6}, { 8057, 6}, /* 39 ~ 42 dB */ |
259 | { 565, 2}, {20287, 7}, {11381, 6}, {25539, 7}, /* 43 ~ 46 dB */ |
260 | { 1791, 3}, { 4019, 4}, { 9019, 5}, {20239, 6}, /* 47 ~ 50 dB */ |
261 | { 5677, 4}, {25479, 6}, { 7147, 4}, { 8019, 4}, /* 51 ~ 54 dB */ |
262 | {17995, 5}, {20191, 5}, {11327, 4}, {12709, 4}, /* 55 ~ 58 dB */ |
263 | { 3565, 2}, { 1000, 0}, { 1122, 0}, { 1259, 0}, /* 59 ~ 62 dB */ |
264 | { 2825, 1}, {12679, 3}, { 7113, 2}, { 7981, 2}, /* 63 ~ 66 dB */ |
265 | { 8955, 2}, {20095, 3}, {22547, 3}, {12649, 2}, /* 67 ~ 70 dB */ |
266 | {28385, 3}, { 3981, 0}, {17867, 2}, {20047, 2}, /* 71 ~ 74 dB */ |
267 | {11247, 1}, {12619, 1}, {14159, 1}, {31773, 2}, /* 75 ~ 78 dB */ |
268 | {17825, 1}, {10000, 0}, {11220, 0}, {12589, 0}, /* 79 ~ 82 dB */ |
269 | {28251, 1}, {15849, 0}, {17783, 0}, {19953, 0}, /* 83 ~ 86 dB */ |
270 | {22387, 0}, {25119, 0}, {28184, 0}, {31623, 0}, /* 87 ~ 90 dB */ |
271 | }; |
272 | |
273 | static const DECLARE_TLV_DB_RANGE(mic_gain_tlv, |
274 | 0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0), |
275 | 2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0), |
276 | 6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0), |
277 | 8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0), |
278 | ); |
279 | |
280 | static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol, |
281 | struct snd_ctl_elem_value *ucontrol) |
282 | { |
283 | struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); |
284 | unsigned int dgain_val, scale_val; |
285 | int i; |
286 | |
287 | dgain_val = (snd_soc_component_read(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK) |
288 | >> PDMIC_DSPR1_DGAIN_SHIFT; |
289 | |
290 | scale_val = (snd_soc_component_read(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK) |
291 | >> PDMIC_DSPR0_SCALE_SHIFT; |
292 | |
293 | for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) { |
294 | if ((mic_gain_table[i].dgain == dgain_val) && |
295 | (mic_gain_table[i].scale == scale_val)) |
296 | ucontrol->value.integer.value[0] = i; |
297 | } |
298 | |
299 | return 0; |
300 | } |
301 | |
302 | static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol, |
303 | struct snd_ctl_elem_value *ucontrol) |
304 | { |
305 | struct soc_mixer_control *mc = |
306 | (struct soc_mixer_control *)kcontrol->private_value; |
307 | struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); |
308 | int max = mc->max; |
309 | unsigned int val; |
310 | int ret; |
311 | |
312 | val = ucontrol->value.integer.value[0]; |
313 | |
314 | if (val > max) |
315 | return -EINVAL; |
316 | |
317 | ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK, |
318 | val: mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT); |
319 | if (ret < 0) |
320 | return ret; |
321 | |
322 | ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK, |
323 | val: mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT); |
324 | if (ret < 0) |
325 | return ret; |
326 | |
327 | return 0; |
328 | } |
329 | |
330 | static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = { |
331 | SOC_SINGLE_EXT_TLV("Mic Capture Volume" , PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT, |
332 | ARRAY_SIZE(mic_gain_table)-1, 0, |
333 | pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv), |
334 | |
335 | SOC_SINGLE("High Pass Filter Switch" , PDMIC_DSPR0, |
336 | PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1), |
337 | |
338 | SOC_SINGLE("SINCC Filter Switch" , PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1), |
339 | }; |
340 | |
341 | static int atmel_pdmic_component_probe(struct snd_soc_component *component) |
342 | { |
343 | struct snd_soc_card *card = snd_soc_component_get_drvdata(c: component); |
344 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); |
345 | |
346 | snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK, |
347 | val: (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT)); |
348 | |
349 | return 0; |
350 | } |
351 | |
352 | #define PDMIC_MR_PRESCAL_MAX_VAL 127 |
353 | |
354 | static int |
355 | atmel_pdmic_cpu_dai_hw_params(struct snd_pcm_substream *substream, |
356 | struct snd_pcm_hw_params *params, |
357 | struct snd_soc_dai *cpu_dai) |
358 | { |
359 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
360 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card: rtd->card); |
361 | struct snd_soc_component *component = cpu_dai->component; |
362 | unsigned int rate_min = substream->runtime->hw.rate_min; |
363 | unsigned int rate_max = substream->runtime->hw.rate_max; |
364 | int fs = params_rate(p: params); |
365 | int bits = params_width(p: params); |
366 | unsigned long pclk_rate, gclk_rate; |
367 | unsigned int f_pdmic; |
368 | u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal; |
369 | |
370 | if (params_channels(p: params) != 1) { |
371 | dev_err(component->dev, |
372 | "only supports one channel\n" ); |
373 | return -EINVAL; |
374 | } |
375 | |
376 | if ((fs < rate_min) || (fs > rate_max)) { |
377 | dev_err(component->dev, |
378 | "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n" , |
379 | fs, rate_min, rate_max); |
380 | |
381 | return -EINVAL; |
382 | } |
383 | |
384 | switch (bits) { |
385 | case 16: |
386 | dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS |
387 | << PDMIC_DSPR0_SIZE_SHIFT); |
388 | break; |
389 | case 32: |
390 | dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS |
391 | << PDMIC_DSPR0_SIZE_SHIFT); |
392 | break; |
393 | default: |
394 | return -EINVAL; |
395 | } |
396 | |
397 | if ((fs << 7) > (rate_max << 6)) { |
398 | f_pdmic = fs << 6; |
399 | dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT; |
400 | } else { |
401 | f_pdmic = fs << 7; |
402 | dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT; |
403 | } |
404 | |
405 | pclk_rate = clk_get_rate(clk: dd->pclk); |
406 | gclk_rate = clk_get_rate(clk: dd->gclk); |
407 | |
408 | /* PRESCAL = SELCK/(2*f_pdmic) - 1*/ |
409 | pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1; |
410 | gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1; |
411 | |
412 | if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) || |
413 | (gclk_rate/((gclk_prescal + 1) << 1) < |
414 | pclk_rate/((pclk_prescal + 1) << 1))) { |
415 | mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT; |
416 | mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT; |
417 | } else { |
418 | mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT; |
419 | mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT; |
420 | } |
421 | |
422 | snd_soc_component_update_bits(component, PDMIC_MR, |
423 | PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, val: mr_val); |
424 | |
425 | snd_soc_component_update_bits(component, PDMIC_DSPR0, |
426 | PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, val: dspr0_val); |
427 | |
428 | return 0; |
429 | } |
430 | |
431 | static int atmel_pdmic_cpu_dai_trigger(struct snd_pcm_substream *substream, |
432 | int cmd, struct snd_soc_dai *cpu_dai) |
433 | { |
434 | struct snd_soc_component *component = cpu_dai->component; |
435 | u32 val; |
436 | |
437 | switch (cmd) { |
438 | case SNDRV_PCM_TRIGGER_START: |
439 | case SNDRV_PCM_TRIGGER_RESUME: |
440 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
441 | val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT; |
442 | break; |
443 | case SNDRV_PCM_TRIGGER_STOP: |
444 | case SNDRV_PCM_TRIGGER_SUSPEND: |
445 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
446 | val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT; |
447 | break; |
448 | default: |
449 | return -EINVAL; |
450 | } |
451 | |
452 | snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val); |
453 | |
454 | return 0; |
455 | } |
456 | |
457 | static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = { |
458 | .startup = atmel_pdmic_cpu_dai_startup, |
459 | .shutdown = atmel_pdmic_cpu_dai_shutdown, |
460 | .prepare = atmel_pdmic_cpu_dai_prepare, |
461 | .hw_params = atmel_pdmic_cpu_dai_hw_params, |
462 | .trigger = atmel_pdmic_cpu_dai_trigger, |
463 | }; |
464 | |
465 | |
466 | static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = { |
467 | .capture = { |
468 | .stream_name = "Capture" , |
469 | .channels_min = 1, |
470 | .channels_max = 1, |
471 | .rates = SNDRV_PCM_RATE_KNOT, |
472 | .formats = ATMEL_PDMIC_FORMATS, |
473 | }, |
474 | .ops = &atmel_pdmic_cpu_dai_ops, |
475 | }; |
476 | |
477 | static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = { |
478 | .name = "atmel-pdmic" , |
479 | .probe = atmel_pdmic_component_probe, |
480 | .controls = atmel_pdmic_snd_controls, |
481 | .num_controls = ARRAY_SIZE(atmel_pdmic_snd_controls), |
482 | .idle_bias_on = 1, |
483 | .use_pmdown_time = 1, |
484 | .legacy_dai_naming = 1, |
485 | }; |
486 | |
487 | /* ASoC sound card */ |
488 | static int atmel_pdmic_asoc_card_init(struct device *dev, |
489 | struct snd_soc_card *card) |
490 | { |
491 | struct snd_soc_dai_link *dai_link; |
492 | struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); |
493 | struct snd_soc_dai_link_component *comp; |
494 | |
495 | dai_link = devm_kzalloc(dev, size: sizeof(*dai_link), GFP_KERNEL); |
496 | if (!dai_link) |
497 | return -ENOMEM; |
498 | |
499 | comp = devm_kzalloc(dev, size: sizeof(*comp), GFP_KERNEL); |
500 | if (!comp) |
501 | return -ENOMEM; |
502 | |
503 | dai_link->cpus = comp; |
504 | dai_link->codecs = &snd_soc_dummy_dlc; |
505 | |
506 | dai_link->num_cpus = 1; |
507 | dai_link->num_codecs = 1; |
508 | |
509 | dai_link->name = "PDMIC" ; |
510 | dai_link->stream_name = "PDMIC PCM" ; |
511 | dai_link->cpus->dai_name = dev_name(dev); |
512 | |
513 | card->dai_link = dai_link; |
514 | card->num_links = 1; |
515 | card->name = dd->pdata->card_name; |
516 | card->dev = dev; |
517 | |
518 | return 0; |
519 | } |
520 | |
521 | static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd, |
522 | unsigned int *rate_min, unsigned int *rate_max) |
523 | { |
524 | u32 mic_min_freq = dd->pdata->mic_min_freq; |
525 | u32 mic_max_freq = dd->pdata->mic_max_freq; |
526 | u32 clk_max_rate = (u32)(clk_get_rate(clk: dd->pclk) >> 1); |
527 | u32 clk_min_rate = (u32)(clk_get_rate(clk: dd->gclk) >> 8); |
528 | |
529 | if (mic_max_freq > clk_max_rate) |
530 | mic_max_freq = clk_max_rate; |
531 | |
532 | if (mic_min_freq < clk_min_rate) |
533 | mic_min_freq = clk_min_rate; |
534 | |
535 | *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128); |
536 | *rate_max = mic_max_freq >> 6; |
537 | } |
538 | |
539 | /* PDMIC interrupt handler */ |
540 | static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id) |
541 | { |
542 | struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id; |
543 | u32 pdmic_isr; |
544 | irqreturn_t ret = IRQ_NONE; |
545 | |
546 | regmap_read(map: dd->regmap, PDMIC_ISR, val: &pdmic_isr); |
547 | |
548 | if (pdmic_isr & PDMIC_ISR_OVRE) { |
549 | regmap_update_bits(map: dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK, |
550 | PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); |
551 | |
552 | snd_pcm_stop_xrun(substream: dd->substream); |
553 | |
554 | ret = IRQ_HANDLED; |
555 | } |
556 | |
557 | return ret; |
558 | } |
559 | |
560 | /* regmap configuration */ |
561 | #define ATMEL_PDMIC_REG_MAX 0x124 |
562 | static const struct regmap_config atmel_pdmic_regmap_config = { |
563 | .reg_bits = 32, |
564 | .reg_stride = 4, |
565 | .val_bits = 32, |
566 | .max_register = ATMEL_PDMIC_REG_MAX, |
567 | }; |
568 | |
569 | static int atmel_pdmic_probe(struct platform_device *pdev) |
570 | { |
571 | struct device *dev = &pdev->dev; |
572 | struct atmel_pdmic *dd; |
573 | struct resource *res; |
574 | void __iomem *io_base; |
575 | const struct atmel_pdmic_pdata *pdata; |
576 | struct snd_soc_card *card; |
577 | unsigned int rate_min, rate_max; |
578 | int ret; |
579 | |
580 | pdata = atmel_pdmic_dt_init(dev); |
581 | if (IS_ERR(ptr: pdata)) |
582 | return PTR_ERR(ptr: pdata); |
583 | |
584 | dd = devm_kzalloc(dev, size: sizeof(*dd), GFP_KERNEL); |
585 | if (!dd) |
586 | return -ENOMEM; |
587 | |
588 | dd->pdata = pdata; |
589 | dd->dev = dev; |
590 | |
591 | dd->irq = platform_get_irq(pdev, 0); |
592 | if (dd->irq < 0) |
593 | return dd->irq; |
594 | |
595 | dd->pclk = devm_clk_get(dev, id: "pclk" ); |
596 | if (IS_ERR(ptr: dd->pclk)) { |
597 | ret = PTR_ERR(ptr: dd->pclk); |
598 | dev_err(dev, "failed to get peripheral clock: %d\n" , ret); |
599 | return ret; |
600 | } |
601 | |
602 | dd->gclk = devm_clk_get(dev, id: "gclk" ); |
603 | if (IS_ERR(ptr: dd->gclk)) { |
604 | ret = PTR_ERR(ptr: dd->gclk); |
605 | dev_err(dev, "failed to get GCK: %d\n" , ret); |
606 | return ret; |
607 | } |
608 | |
609 | /* The gclk clock frequency must always be three times |
610 | * lower than the pclk clock frequency |
611 | */ |
612 | ret = clk_set_rate(clk: dd->gclk, rate: clk_get_rate(clk: dd->pclk)/3); |
613 | if (ret) { |
614 | dev_err(dev, "failed to set GCK clock rate: %d\n" , ret); |
615 | return ret; |
616 | } |
617 | |
618 | io_base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res); |
619 | if (IS_ERR(ptr: io_base)) |
620 | return PTR_ERR(ptr: io_base); |
621 | |
622 | dd->phy_base = res->start; |
623 | |
624 | dd->regmap = devm_regmap_init_mmio(dev, io_base, |
625 | &atmel_pdmic_regmap_config); |
626 | if (IS_ERR(ptr: dd->regmap)) { |
627 | ret = PTR_ERR(ptr: dd->regmap); |
628 | dev_err(dev, "failed to init register map: %d\n" , ret); |
629 | return ret; |
630 | } |
631 | |
632 | ret = devm_request_irq(dev, irq: dd->irq, handler: atmel_pdmic_interrupt, irqflags: 0, |
633 | devname: "PDMIC" , dev_id: (void *)dd); |
634 | if (ret < 0) { |
635 | dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n" , |
636 | dd->irq, ret); |
637 | return ret; |
638 | } |
639 | |
640 | /* Get the minimal and maximal sample rate that the microphone supports */ |
641 | atmel_pdmic_get_sample_rate(dd, rate_min: &rate_min, rate_max: &rate_max); |
642 | |
643 | /* register cpu dai */ |
644 | atmel_pdmic_cpu_dai.capture.rate_min = rate_min; |
645 | atmel_pdmic_cpu_dai.capture.rate_max = rate_max; |
646 | ret = devm_snd_soc_register_component(dev, |
647 | component_driver: &atmel_pdmic_cpu_dai_component, |
648 | dai_drv: &atmel_pdmic_cpu_dai, num_dai: 1); |
649 | if (ret) { |
650 | dev_err(dev, "could not register CPU DAI: %d\n" , ret); |
651 | return ret; |
652 | } |
653 | |
654 | /* register platform */ |
655 | ret = devm_snd_dmaengine_pcm_register(dev, |
656 | config: &atmel_pdmic_dmaengine_pcm_config, |
657 | flags: 0); |
658 | if (ret) { |
659 | dev_err(dev, "could not register platform: %d\n" , ret); |
660 | return ret; |
661 | } |
662 | |
663 | /* register sound card */ |
664 | card = devm_kzalloc(dev, size: sizeof(*card), GFP_KERNEL); |
665 | if (!card) { |
666 | ret = -ENOMEM; |
667 | goto unregister_codec; |
668 | } |
669 | |
670 | snd_soc_card_set_drvdata(card, data: dd); |
671 | |
672 | ret = atmel_pdmic_asoc_card_init(dev, card); |
673 | if (ret) { |
674 | dev_err(dev, "failed to init sound card: %d\n" , ret); |
675 | goto unregister_codec; |
676 | } |
677 | |
678 | ret = devm_snd_soc_register_card(dev, card); |
679 | if (ret) { |
680 | dev_err(dev, "failed to register sound card: %d\n" , ret); |
681 | goto unregister_codec; |
682 | } |
683 | |
684 | return 0; |
685 | |
686 | unregister_codec: |
687 | return ret; |
688 | } |
689 | |
690 | static struct platform_driver atmel_pdmic_driver = { |
691 | .driver = { |
692 | .name = "atmel-pdmic" , |
693 | .of_match_table = atmel_pdmic_of_match, |
694 | .pm = &snd_soc_pm_ops, |
695 | }, |
696 | .probe = atmel_pdmic_probe, |
697 | }; |
698 | module_platform_driver(atmel_pdmic_driver); |
699 | |
700 | MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture" ); |
701 | MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>" ); |
702 | MODULE_LICENSE("GPL v2" ); |
703 | |