Commit | Line | Data |
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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 | ||
8 | #include <linux/clk.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/io.h> | |
11 | ||
12 | #include <sound/soc.h> | |
13 | ||
14 | #include "uniperif.h" | |
15 | ||
16 | /* | |
17 | * Note: snd_pcm_hardware is linked to DMA controller but is declared here to | |
18 | * integrate unireader capability in term of rate and supported channels | |
19 | */ | |
f2da4542 | 20 | static const struct snd_pcm_hardware uni_reader_pcm_hw = { |
c3a0003a AP |
21 | .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
22 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP | | |
23 | SNDRV_PCM_INFO_MMAP_VALID, | |
24 | .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE, | |
25 | ||
26 | .rates = SNDRV_PCM_RATE_CONTINUOUS, | |
27 | .rate_min = 8000, | |
28 | .rate_max = 96000, | |
29 | ||
30 | .channels_min = 2, | |
31 | .channels_max = 8, | |
32 | ||
33 | .periods_min = 2, | |
34 | .periods_max = 48, | |
35 | ||
36 | .period_bytes_min = 128, | |
37 | .period_bytes_max = 64 * PAGE_SIZE, | |
38 | .buffer_bytes_max = 256 * PAGE_SIZE | |
39 | }; | |
40 | ||
41 | /* | |
42 | * uni_reader_irq_handler | |
43 | * In case of error audio stream is stopped; stop action is protected via PCM | |
44 | * stream lock to avoid race condition with trigger callback. | |
45 | */ | |
46 | static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id) | |
47 | { | |
48 | irqreturn_t ret = IRQ_NONE; | |
49 | struct uniperif *reader = dev_id; | |
50 | unsigned int status; | |
51 | ||
52 | if (reader->state == UNIPERIF_STATE_STOPPED) { | |
53 | /* Unexpected IRQ: do nothing */ | |
54 | dev_warn(reader->dev, "unexpected IRQ "); | |
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | /* Get interrupt status & clear them immediately */ | |
59 | status = GET_UNIPERIF_ITS(reader); | |
60 | SET_UNIPERIF_ITS_BCLR(reader, status); | |
61 | ||
62 | /* Check for fifo overflow error */ | |
63 | if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) { | |
64 | dev_err(reader->dev, "FIFO error detected"); | |
65 | ||
66 | snd_pcm_stream_lock(reader->substream); | |
67 | snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN); | |
68 | snd_pcm_stream_unlock(reader->substream); | |
69 | ||
70 | return IRQ_HANDLED; | |
71 | } | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
82d4eb91 MG |
76 | static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime, |
77 | struct uniperif *reader) | |
c3a0003a | 78 | { |
c3a0003a | 79 | int slot_width; |
c3a0003a AP |
80 | |
81 | /* Force slot width to 32 in I2S mode */ | |
82 | if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) | |
83 | == SND_SOC_DAIFMT_I2S) { | |
84 | slot_width = 32; | |
85 | } else { | |
86 | switch (runtime->format) { | |
87 | case SNDRV_PCM_FORMAT_S16_LE: | |
88 | slot_width = 16; | |
89 | break; | |
90 | default: | |
91 | slot_width = 32; | |
92 | break; | |
93 | } | |
94 | } | |
95 | ||
96 | /* Number of bits per subframe (i.e one channel sample) on input. */ | |
97 | switch (slot_width) { | |
98 | case 32: | |
99 | SET_UNIPERIF_I2S_FMT_NBIT_32(reader); | |
100 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); | |
101 | break; | |
102 | case 16: | |
103 | SET_UNIPERIF_I2S_FMT_NBIT_16(reader); | |
104 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader); | |
105 | break; | |
106 | default: | |
107 | dev_err(reader->dev, "subframe format not supported"); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | /* Configure data memory format */ | |
112 | switch (runtime->format) { | |
113 | case SNDRV_PCM_FORMAT_S16_LE: | |
114 | /* One data word contains two samples */ | |
115 | SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader); | |
116 | break; | |
117 | ||
118 | case SNDRV_PCM_FORMAT_S32_LE: | |
119 | /* | |
120 | * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits | |
121 | * on the MSB then zeros (if less than 32 bytes)"... | |
122 | */ | |
123 | SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); | |
124 | break; | |
125 | ||
126 | default: | |
127 | dev_err(reader->dev, "format not supported"); | |
128 | return -EINVAL; | |
129 | } | |
130 | ||
82d4eb91 MG |
131 | /* Number of channels must be even */ |
132 | if ((runtime->channels % 2) || (runtime->channels < 2) || | |
133 | (runtime->channels > 10)) { | |
134 | dev_err(reader->dev, "%s: invalid nb of channels", __func__); | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2); | |
139 | SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime, | |
145 | struct uniperif *reader) | |
146 | { | |
147 | int frame_size; /* user tdm frame size in bytes */ | |
148 | /* default unip TDM_WORD_POS_X_Y */ | |
149 | unsigned int word_pos[4] = { | |
150 | 0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A}; | |
151 | ||
152 | frame_size = sti_uniperiph_get_user_frame_size(runtime); | |
153 | ||
154 | /* fix 16/0 format */ | |
155 | SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); | |
156 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); | |
157 | ||
158 | /* number of words inserted on the TDM line */ | |
159 | SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2); | |
160 | ||
161 | SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); | |
162 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
163 | SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader); | |
164 | ||
165 | /* | |
166 | * set the timeslots allocation for words in FIFO | |
167 | * | |
168 | * HW bug: (LSB word < MSB word) => this config is not possible | |
169 | * So if we want (LSB word < MSB) word, then it shall be | |
170 | * handled by user | |
171 | */ | |
172 | sti_uniperiph_get_tdm_word_pos(reader, word_pos); | |
173 | SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]); | |
174 | SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]); | |
175 | SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]); | |
176 | SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static int uni_reader_prepare(struct snd_pcm_substream *substream, | |
182 | struct snd_soc_dai *dai) | |
183 | { | |
184 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
185 | struct uniperif *reader = priv->dai_data.uni; | |
186 | struct snd_pcm_runtime *runtime = substream->runtime; | |
187 | int transfer_size, trigger_limit, ret; | |
188 | int count = 10; | |
189 | ||
190 | /* The reader should be stopped */ | |
191 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
192 | dev_err(reader->dev, "%s: invalid reader state %d", __func__, | |
193 | reader->state); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | /* Calculate transfer size (in fifo cells and bytes) for frame count */ | |
198 | if (reader->info->type == SND_ST_UNIPERIF_TYPE_TDM) { | |
199 | /* transfer size = unip frame size (in 32 bits FIFO cell) */ | |
200 | transfer_size = | |
201 | sti_uniperiph_get_user_frame_size(runtime) / 4; | |
202 | } else { | |
203 | transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES; | |
204 | } | |
205 | ||
206 | /* Calculate number of empty cells available before asserting DREQ */ | |
207 | if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) | |
208 | trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size; | |
209 | else | |
210 | /* | |
211 | * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0 | |
212 | * FDMA_TRIGGER_LIMIT also controls when the state switches | |
213 | * from OFF or STANDBY to AUDIO DATA. | |
214 | */ | |
215 | trigger_limit = transfer_size; | |
216 | ||
217 | /* Trigger limit must be an even number */ | |
218 | if ((!trigger_limit % 2) || | |
219 | (trigger_limit != 1 && transfer_size % 2) || | |
220 | (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) { | |
221 | dev_err(reader->dev, "invalid trigger limit %d", trigger_limit); | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit); | |
226 | ||
227 | if (UNIPERIF_TYPE_IS_TDM(reader)) | |
228 | ret = uni_reader_prepare_tdm(runtime, reader); | |
229 | else | |
230 | ret = uni_reader_prepare_pcm(runtime, reader); | |
231 | if (ret) | |
232 | return ret; | |
233 | ||
c3a0003a AP |
234 | switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) { |
235 | case SND_SOC_DAIFMT_I2S: | |
236 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
237 | SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader); | |
238 | break; | |
239 | case SND_SOC_DAIFMT_LEFT_J: | |
240 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
241 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
242 | break; | |
243 | case SND_SOC_DAIFMT_RIGHT_J: | |
244 | SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader); | |
245 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
246 | break; | |
247 | default: | |
248 | dev_err(reader->dev, "format not supported"); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
82d4eb91 MG |
252 | /* Data clocking (changing) on the rising/falling edge */ |
253 | switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) { | |
254 | case SND_SOC_DAIFMT_NB_NF: | |
255 | SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); | |
256 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); | |
257 | break; | |
258 | case SND_SOC_DAIFMT_NB_IF: | |
259 | SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); | |
260 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); | |
261 | break; | |
262 | case SND_SOC_DAIFMT_IB_NF: | |
263 | SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); | |
264 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); | |
265 | break; | |
266 | case SND_SOC_DAIFMT_IB_IF: | |
267 | SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); | |
268 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); | |
269 | break; | |
c3a0003a AP |
270 | } |
271 | ||
c3a0003a AP |
272 | /* Clear any pending interrupts */ |
273 | SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader)); | |
274 | ||
275 | SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0); | |
276 | ||
277 | /* Set the interrupt mask */ | |
278 | SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader); | |
279 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
280 | SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader); | |
281 | ||
282 | /* Enable underflow recovery interrupts */ | |
283 | if (reader->info->underflow_enabled) { | |
284 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader); | |
285 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader); | |
286 | } | |
287 | ||
288 | /* Reset uniperipheral reader */ | |
289 | SET_UNIPERIF_SOFT_RST_SOFT_RST(reader); | |
290 | ||
291 | while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) { | |
292 | udelay(5); | |
293 | count--; | |
294 | } | |
295 | if (!count) { | |
296 | dev_err(reader->dev, "Failed to reset uniperif"); | |
297 | return -EIO; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int uni_reader_start(struct uniperif *reader) | |
304 | { | |
305 | /* The reader should be stopped */ | |
306 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
307 | dev_err(reader->dev, "%s: invalid reader state", __func__); | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
311 | /* Enable reader interrupts (and clear possible stalled ones) */ | |
312 | SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader); | |
313 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
314 | ||
315 | /* Launch the reader */ | |
316 | SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader); | |
317 | ||
318 | /* Update state to started */ | |
319 | reader->state = UNIPERIF_STATE_STARTED; | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static int uni_reader_stop(struct uniperif *reader) | |
324 | { | |
325 | /* The reader should not be in stopped state */ | |
326 | if (reader->state == UNIPERIF_STATE_STOPPED) { | |
327 | dev_err(reader->dev, "%s: invalid reader state", __func__); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | /* Turn the reader off */ | |
332 | SET_UNIPERIF_CTRL_OPERATION_OFF(reader); | |
333 | ||
334 | /* Disable interrupts */ | |
335 | SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader)); | |
336 | ||
337 | /* Update state to stopped and return */ | |
338 | reader->state = UNIPERIF_STATE_STOPPED; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | static int uni_reader_trigger(struct snd_pcm_substream *substream, | |
344 | int cmd, struct snd_soc_dai *dai) | |
345 | { | |
346 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
347 | struct uniperif *reader = priv->dai_data.uni; | |
348 | ||
349 | switch (cmd) { | |
350 | case SNDRV_PCM_TRIGGER_START: | |
351 | return uni_reader_start(reader); | |
352 | case SNDRV_PCM_TRIGGER_STOP: | |
353 | return uni_reader_stop(reader); | |
354 | default: | |
355 | return -EINVAL; | |
356 | } | |
357 | } | |
358 | ||
82d4eb91 MG |
359 | static int uni_reader_startup(struct snd_pcm_substream *substream, |
360 | struct snd_soc_dai *dai) | |
361 | { | |
362 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
363 | struct uniperif *reader = priv->dai_data.uni; | |
364 | int ret; | |
365 | ||
366 | if (!UNIPERIF_TYPE_IS_TDM(reader)) | |
367 | return 0; | |
368 | ||
369 | /* refine hw constraint in tdm mode */ | |
370 | ret = snd_pcm_hw_rule_add(substream->runtime, 0, | |
371 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
372 | sti_uniperiph_fix_tdm_chan, | |
373 | reader, SNDRV_PCM_HW_PARAM_CHANNELS, | |
374 | -1); | |
375 | if (ret < 0) | |
376 | return ret; | |
377 | ||
378 | return snd_pcm_hw_rule_add(substream->runtime, 0, | |
379 | SNDRV_PCM_HW_PARAM_FORMAT, | |
380 | sti_uniperiph_fix_tdm_format, | |
381 | reader, SNDRV_PCM_HW_PARAM_FORMAT, | |
382 | -1); | |
383 | } | |
384 | ||
c3a0003a AP |
385 | static void uni_reader_shutdown(struct snd_pcm_substream *substream, |
386 | struct snd_soc_dai *dai) | |
387 | { | |
388 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
389 | struct uniperif *reader = priv->dai_data.uni; | |
390 | ||
391 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
392 | /* Stop the reader */ | |
393 | uni_reader_stop(reader); | |
394 | } | |
395 | } | |
396 | ||
397 | static int uni_reader_parse_dt(struct platform_device *pdev, | |
398 | struct uniperif *reader) | |
399 | { | |
400 | struct uniperif_info *info; | |
401 | struct device_node *node = pdev->dev.of_node; | |
82d4eb91 | 402 | const char *mode; |
c3a0003a AP |
403 | |
404 | /* Allocate memory for the info structure */ | |
405 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
406 | if (!info) | |
407 | return -ENOMEM; | |
408 | ||
f9f51973 | 409 | if (of_property_read_u32(node, "st,version", &reader->ver) || |
3a0e27d8 AP |
410 | reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) { |
411 | dev_err(&pdev->dev, "Unknown uniperipheral version "); | |
412 | return -EINVAL; | |
413 | } | |
c3a0003a | 414 | |
82d4eb91 MG |
415 | /* Read the device mode property */ |
416 | if (of_property_read_string(node, "st,mode", &mode)) { | |
417 | dev_err(&pdev->dev, "uniperipheral mode not defined"); | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
421 | if (strcasecmp(mode, "tdm") == 0) | |
422 | info->type = SND_ST_UNIPERIF_TYPE_TDM; | |
423 | else | |
424 | info->type = SND_ST_UNIPERIF_TYPE_PCM; | |
425 | ||
c3a0003a AP |
426 | /* Save the info structure */ |
427 | reader->info = info; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
f2da4542 | 432 | static const struct snd_soc_dai_ops uni_reader_dai_ops = { |
82d4eb91 | 433 | .startup = uni_reader_startup, |
c3a0003a AP |
434 | .shutdown = uni_reader_shutdown, |
435 | .prepare = uni_reader_prepare, | |
436 | .trigger = uni_reader_trigger, | |
437 | .hw_params = sti_uniperiph_dai_hw_params, | |
438 | .set_fmt = sti_uniperiph_dai_set_fmt, | |
82d4eb91 | 439 | .set_tdm_slot = sti_uniperiph_set_tdm_slot |
c3a0003a AP |
440 | }; |
441 | ||
442 | int uni_reader_init(struct platform_device *pdev, | |
443 | struct uniperif *reader) | |
444 | { | |
445 | int ret = 0; | |
446 | ||
447 | reader->dev = &pdev->dev; | |
448 | reader->state = UNIPERIF_STATE_STOPPED; | |
c3a0003a AP |
449 | reader->dai_ops = &uni_reader_dai_ops; |
450 | ||
c3a0003a AP |
451 | ret = uni_reader_parse_dt(pdev, reader); |
452 | if (ret < 0) { | |
453 | dev_err(reader->dev, "Failed to parse DeviceTree"); | |
454 | return ret; | |
455 | } | |
456 | ||
82d4eb91 MG |
457 | if (UNIPERIF_TYPE_IS_TDM(reader)) |
458 | reader->hw = &uni_tdm_hw; | |
459 | else | |
460 | reader->hw = &uni_reader_pcm_hw; | |
461 | ||
c3a0003a AP |
462 | ret = devm_request_irq(&pdev->dev, reader->irq, |
463 | uni_reader_irq_handler, IRQF_SHARED, | |
464 | dev_name(&pdev->dev), reader); | |
465 | if (ret < 0) { | |
466 | dev_err(&pdev->dev, "Failed to request IRQ"); | |
467 | return -EBUSY; | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(uni_reader_init); |