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c3a0003a AP |
1 | /* |
2 | * Copyright (C) STMicroelectronics SA 2015 | |
3 | * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com> | |
4 | * for STMicroelectronics. | |
5 | * License terms: GNU General Public License (GPL), version 2 | |
6 | */ | |
7 | ||
c3a0003a AP |
8 | #include <sound/soc.h> |
9 | ||
10 | #include "uniperif.h" | |
11 | ||
5a4326d1 | 12 | #define UNIPERIF_READER_I2S_IN 0 /* reader id connected to I2S/TDM TX bus */ |
c3a0003a AP |
13 | /* |
14 | * Note: snd_pcm_hardware is linked to DMA controller but is declared here to | |
15 | * integrate unireader capability in term of rate and supported channels | |
16 | */ | |
f2da4542 | 17 | static const struct snd_pcm_hardware uni_reader_pcm_hw = { |
c3a0003a AP |
18 | .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
19 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP | | |
20 | SNDRV_PCM_INFO_MMAP_VALID, | |
21 | .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE, | |
22 | ||
23 | .rates = SNDRV_PCM_RATE_CONTINUOUS, | |
24 | .rate_min = 8000, | |
25 | .rate_max = 96000, | |
26 | ||
27 | .channels_min = 2, | |
28 | .channels_max = 8, | |
29 | ||
30 | .periods_min = 2, | |
31 | .periods_max = 48, | |
32 | ||
33 | .period_bytes_min = 128, | |
34 | .period_bytes_max = 64 * PAGE_SIZE, | |
35 | .buffer_bytes_max = 256 * PAGE_SIZE | |
36 | }; | |
37 | ||
38 | /* | |
39 | * uni_reader_irq_handler | |
40 | * In case of error audio stream is stopped; stop action is protected via PCM | |
41 | * stream lock to avoid race condition with trigger callback. | |
42 | */ | |
43 | static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id) | |
44 | { | |
45 | irqreturn_t ret = IRQ_NONE; | |
46 | struct uniperif *reader = dev_id; | |
47 | unsigned int status; | |
48 | ||
d05d862e AP |
49 | spin_lock(&reader->irq_lock); |
50 | if (!reader->substream) | |
51 | goto irq_spin_unlock; | |
52 | ||
53 | snd_pcm_stream_lock(reader->substream); | |
c3a0003a AP |
54 | if (reader->state == UNIPERIF_STATE_STOPPED) { |
55 | /* Unexpected IRQ: do nothing */ | |
748abba8 | 56 | dev_warn(reader->dev, "unexpected IRQ\n"); |
d05d862e | 57 | goto stream_unlock; |
c3a0003a AP |
58 | } |
59 | ||
60 | /* Get interrupt status & clear them immediately */ | |
61 | status = GET_UNIPERIF_ITS(reader); | |
62 | SET_UNIPERIF_ITS_BCLR(reader, status); | |
63 | ||
64 | /* Check for fifo overflow error */ | |
65 | if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) { | |
748abba8 | 66 | dev_err(reader->dev, "FIFO error detected\n"); |
c3a0003a | 67 | |
c3a0003a | 68 | snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN); |
c3a0003a | 69 | |
d05d862e | 70 | ret = IRQ_HANDLED; |
c3a0003a AP |
71 | } |
72 | ||
d05d862e AP |
73 | stream_unlock: |
74 | snd_pcm_stream_unlock(reader->substream); | |
75 | irq_spin_unlock: | |
76 | spin_unlock(&reader->irq_lock); | |
77 | ||
c3a0003a AP |
78 | return ret; |
79 | } | |
80 | ||
82d4eb91 MG |
81 | static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime, |
82 | struct uniperif *reader) | |
c3a0003a | 83 | { |
c3a0003a | 84 | int slot_width; |
c3a0003a AP |
85 | |
86 | /* Force slot width to 32 in I2S mode */ | |
87 | if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) | |
88 | == SND_SOC_DAIFMT_I2S) { | |
89 | slot_width = 32; | |
90 | } else { | |
91 | switch (runtime->format) { | |
92 | case SNDRV_PCM_FORMAT_S16_LE: | |
93 | slot_width = 16; | |
94 | break; | |
95 | default: | |
96 | slot_width = 32; | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
101 | /* Number of bits per subframe (i.e one channel sample) on input. */ | |
102 | switch (slot_width) { | |
103 | case 32: | |
104 | SET_UNIPERIF_I2S_FMT_NBIT_32(reader); | |
105 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); | |
106 | break; | |
107 | case 16: | |
108 | SET_UNIPERIF_I2S_FMT_NBIT_16(reader); | |
109 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader); | |
110 | break; | |
111 | default: | |
748abba8 | 112 | dev_err(reader->dev, "subframe format not supported\n"); |
c3a0003a AP |
113 | return -EINVAL; |
114 | } | |
115 | ||
116 | /* Configure data memory format */ | |
117 | switch (runtime->format) { | |
118 | case SNDRV_PCM_FORMAT_S16_LE: | |
119 | /* One data word contains two samples */ | |
120 | SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader); | |
121 | break; | |
122 | ||
123 | case SNDRV_PCM_FORMAT_S32_LE: | |
124 | /* | |
125 | * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits | |
126 | * on the MSB then zeros (if less than 32 bytes)"... | |
127 | */ | |
128 | SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); | |
129 | break; | |
130 | ||
131 | default: | |
748abba8 | 132 | dev_err(reader->dev, "format not supported\n"); |
c3a0003a AP |
133 | return -EINVAL; |
134 | } | |
135 | ||
82d4eb91 MG |
136 | /* Number of channels must be even */ |
137 | if ((runtime->channels % 2) || (runtime->channels < 2) || | |
138 | (runtime->channels > 10)) { | |
748abba8 | 139 | dev_err(reader->dev, "%s: invalid nb of channels\n", __func__); |
82d4eb91 MG |
140 | return -EINVAL; |
141 | } | |
142 | ||
143 | SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2); | |
144 | SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime, | |
150 | struct uniperif *reader) | |
151 | { | |
152 | int frame_size; /* user tdm frame size in bytes */ | |
153 | /* default unip TDM_WORD_POS_X_Y */ | |
154 | unsigned int word_pos[4] = { | |
155 | 0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A}; | |
156 | ||
157 | frame_size = sti_uniperiph_get_user_frame_size(runtime); | |
158 | ||
159 | /* fix 16/0 format */ | |
160 | SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); | |
161 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); | |
162 | ||
163 | /* number of words inserted on the TDM line */ | |
164 | SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2); | |
165 | ||
166 | SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); | |
167 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
168 | SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader); | |
169 | ||
170 | /* | |
171 | * set the timeslots allocation for words in FIFO | |
172 | * | |
173 | * HW bug: (LSB word < MSB word) => this config is not possible | |
174 | * So if we want (LSB word < MSB) word, then it shall be | |
175 | * handled by user | |
176 | */ | |
177 | sti_uniperiph_get_tdm_word_pos(reader, word_pos); | |
178 | SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]); | |
179 | SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]); | |
180 | SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]); | |
181 | SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int uni_reader_prepare(struct snd_pcm_substream *substream, | |
187 | struct snd_soc_dai *dai) | |
188 | { | |
189 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
190 | struct uniperif *reader = priv->dai_data.uni; | |
191 | struct snd_pcm_runtime *runtime = substream->runtime; | |
192 | int transfer_size, trigger_limit, ret; | |
82d4eb91 MG |
193 | |
194 | /* The reader should be stopped */ | |
195 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
748abba8 | 196 | dev_err(reader->dev, "%s: invalid reader state %d\n", __func__, |
82d4eb91 MG |
197 | reader->state); |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | /* Calculate transfer size (in fifo cells and bytes) for frame count */ | |
5a4326d1 | 202 | if (reader->type == SND_ST_UNIPERIF_TYPE_TDM) { |
82d4eb91 MG |
203 | /* transfer size = unip frame size (in 32 bits FIFO cell) */ |
204 | transfer_size = | |
205 | sti_uniperiph_get_user_frame_size(runtime) / 4; | |
206 | } else { | |
207 | transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES; | |
208 | } | |
209 | ||
210 | /* Calculate number of empty cells available before asserting DREQ */ | |
211 | if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) | |
212 | trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size; | |
213 | else | |
214 | /* | |
215 | * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0 | |
216 | * FDMA_TRIGGER_LIMIT also controls when the state switches | |
217 | * from OFF or STANDBY to AUDIO DATA. | |
218 | */ | |
219 | trigger_limit = transfer_size; | |
220 | ||
221 | /* Trigger limit must be an even number */ | |
222 | if ((!trigger_limit % 2) || | |
223 | (trigger_limit != 1 && transfer_size % 2) || | |
224 | (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) { | |
748abba8 AP |
225 | dev_err(reader->dev, "invalid trigger limit %d\n", |
226 | trigger_limit); | |
82d4eb91 MG |
227 | return -EINVAL; |
228 | } | |
229 | ||
230 | SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit); | |
231 | ||
232 | if (UNIPERIF_TYPE_IS_TDM(reader)) | |
233 | ret = uni_reader_prepare_tdm(runtime, reader); | |
234 | else | |
235 | ret = uni_reader_prepare_pcm(runtime, reader); | |
236 | if (ret) | |
237 | return ret; | |
238 | ||
c3a0003a AP |
239 | switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) { |
240 | case SND_SOC_DAIFMT_I2S: | |
241 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
242 | SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader); | |
243 | break; | |
244 | case SND_SOC_DAIFMT_LEFT_J: | |
245 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
246 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
247 | break; | |
248 | case SND_SOC_DAIFMT_RIGHT_J: | |
249 | SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader); | |
250 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
251 | break; | |
252 | default: | |
748abba8 | 253 | dev_err(reader->dev, "format not supported\n"); |
c3a0003a AP |
254 | return -EINVAL; |
255 | } | |
256 | ||
82d4eb91 MG |
257 | /* Data clocking (changing) on the rising/falling edge */ |
258 | switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) { | |
259 | case SND_SOC_DAIFMT_NB_NF: | |
260 | SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); | |
261 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); | |
262 | break; | |
263 | case SND_SOC_DAIFMT_NB_IF: | |
264 | SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); | |
265 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); | |
266 | break; | |
267 | case SND_SOC_DAIFMT_IB_NF: | |
268 | SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); | |
269 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); | |
270 | break; | |
271 | case SND_SOC_DAIFMT_IB_IF: | |
272 | SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); | |
273 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); | |
274 | break; | |
c3a0003a AP |
275 | } |
276 | ||
c3a0003a AP |
277 | /* Clear any pending interrupts */ |
278 | SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader)); | |
279 | ||
280 | SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0); | |
281 | ||
282 | /* Set the interrupt mask */ | |
283 | SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader); | |
284 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
285 | SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader); | |
286 | ||
287 | /* Enable underflow recovery interrupts */ | |
5a4326d1 | 288 | if (reader->underflow_enabled) { |
c3a0003a AP |
289 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader); |
290 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader); | |
291 | } | |
292 | ||
293 | /* Reset uniperipheral reader */ | |
4c88f89f | 294 | return sti_uniperiph_reset(reader); |
c3a0003a AP |
295 | } |
296 | ||
297 | static int uni_reader_start(struct uniperif *reader) | |
298 | { | |
299 | /* The reader should be stopped */ | |
300 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
748abba8 | 301 | dev_err(reader->dev, "%s: invalid reader state\n", __func__); |
c3a0003a AP |
302 | return -EINVAL; |
303 | } | |
304 | ||
305 | /* Enable reader interrupts (and clear possible stalled ones) */ | |
306 | SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader); | |
307 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
308 | ||
309 | /* Launch the reader */ | |
310 | SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader); | |
311 | ||
312 | /* Update state to started */ | |
313 | reader->state = UNIPERIF_STATE_STARTED; | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int uni_reader_stop(struct uniperif *reader) | |
318 | { | |
319 | /* The reader should not be in stopped state */ | |
320 | if (reader->state == UNIPERIF_STATE_STOPPED) { | |
748abba8 | 321 | dev_err(reader->dev, "%s: invalid reader state\n", __func__); |
c3a0003a AP |
322 | return -EINVAL; |
323 | } | |
324 | ||
325 | /* Turn the reader off */ | |
326 | SET_UNIPERIF_CTRL_OPERATION_OFF(reader); | |
327 | ||
328 | /* Disable interrupts */ | |
329 | SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader)); | |
330 | ||
331 | /* Update state to stopped and return */ | |
332 | reader->state = UNIPERIF_STATE_STOPPED; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int uni_reader_trigger(struct snd_pcm_substream *substream, | |
338 | int cmd, struct snd_soc_dai *dai) | |
339 | { | |
340 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
341 | struct uniperif *reader = priv->dai_data.uni; | |
342 | ||
343 | switch (cmd) { | |
344 | case SNDRV_PCM_TRIGGER_START: | |
345 | return uni_reader_start(reader); | |
346 | case SNDRV_PCM_TRIGGER_STOP: | |
347 | return uni_reader_stop(reader); | |
348 | default: | |
349 | return -EINVAL; | |
350 | } | |
351 | } | |
352 | ||
82d4eb91 MG |
353 | static int uni_reader_startup(struct snd_pcm_substream *substream, |
354 | struct snd_soc_dai *dai) | |
355 | { | |
356 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
357 | struct uniperif *reader = priv->dai_data.uni; | |
d05d862e | 358 | unsigned long flags; |
82d4eb91 MG |
359 | int ret; |
360 | ||
d05d862e | 361 | spin_lock_irqsave(&reader->irq_lock, flags); |
3c9d3f1b | 362 | reader->substream = substream; |
d05d862e | 363 | spin_unlock_irqrestore(&reader->irq_lock, flags); |
3c9d3f1b | 364 | |
82d4eb91 MG |
365 | if (!UNIPERIF_TYPE_IS_TDM(reader)) |
366 | return 0; | |
367 | ||
368 | /* refine hw constraint in tdm mode */ | |
369 | ret = snd_pcm_hw_rule_add(substream->runtime, 0, | |
370 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
371 | sti_uniperiph_fix_tdm_chan, | |
372 | reader, SNDRV_PCM_HW_PARAM_CHANNELS, | |
373 | -1); | |
374 | if (ret < 0) | |
375 | return ret; | |
376 | ||
377 | return snd_pcm_hw_rule_add(substream->runtime, 0, | |
378 | SNDRV_PCM_HW_PARAM_FORMAT, | |
379 | sti_uniperiph_fix_tdm_format, | |
380 | reader, SNDRV_PCM_HW_PARAM_FORMAT, | |
381 | -1); | |
382 | } | |
383 | ||
c3a0003a AP |
384 | static void uni_reader_shutdown(struct snd_pcm_substream *substream, |
385 | struct snd_soc_dai *dai) | |
386 | { | |
387 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
388 | struct uniperif *reader = priv->dai_data.uni; | |
d05d862e | 389 | unsigned long flags; |
c3a0003a | 390 | |
d05d862e | 391 | spin_lock_irqsave(&reader->irq_lock, flags); |
c3a0003a AP |
392 | if (reader->state != UNIPERIF_STATE_STOPPED) { |
393 | /* Stop the reader */ | |
394 | uni_reader_stop(reader); | |
395 | } | |
3c9d3f1b | 396 | reader->substream = NULL; |
d05d862e | 397 | spin_unlock_irqrestore(&reader->irq_lock, flags); |
c3a0003a AP |
398 | } |
399 | ||
f2da4542 | 400 | static const struct snd_soc_dai_ops uni_reader_dai_ops = { |
82d4eb91 | 401 | .startup = uni_reader_startup, |
c3a0003a AP |
402 | .shutdown = uni_reader_shutdown, |
403 | .prepare = uni_reader_prepare, | |
404 | .trigger = uni_reader_trigger, | |
405 | .hw_params = sti_uniperiph_dai_hw_params, | |
406 | .set_fmt = sti_uniperiph_dai_set_fmt, | |
82d4eb91 | 407 | .set_tdm_slot = sti_uniperiph_set_tdm_slot |
c3a0003a AP |
408 | }; |
409 | ||
410 | int uni_reader_init(struct platform_device *pdev, | |
411 | struct uniperif *reader) | |
412 | { | |
413 | int ret = 0; | |
414 | ||
415 | reader->dev = &pdev->dev; | |
416 | reader->state = UNIPERIF_STATE_STOPPED; | |
c3a0003a AP |
417 | reader->dai_ops = &uni_reader_dai_ops; |
418 | ||
82d4eb91 MG |
419 | if (UNIPERIF_TYPE_IS_TDM(reader)) |
420 | reader->hw = &uni_tdm_hw; | |
421 | else | |
422 | reader->hw = &uni_reader_pcm_hw; | |
423 | ||
c3a0003a AP |
424 | ret = devm_request_irq(&pdev->dev, reader->irq, |
425 | uni_reader_irq_handler, IRQF_SHARED, | |
426 | dev_name(&pdev->dev), reader); | |
427 | if (ret < 0) { | |
748abba8 | 428 | dev_err(&pdev->dev, "Failed to request IRQ\n"); |
c3a0003a AP |
429 | return -EBUSY; |
430 | } | |
431 | ||
d05d862e AP |
432 | spin_lock_init(&reader->irq_lock); |
433 | ||
c3a0003a AP |
434 | return 0; |
435 | } | |
436 | EXPORT_SYMBOL_GPL(uni_reader_init); |