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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 | ||
76 | static int uni_reader_prepare(struct snd_pcm_substream *substream, | |
77 | struct snd_soc_dai *dai) | |
78 | { | |
79 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
80 | struct uniperif *reader = priv->dai_data.uni; | |
81 | struct snd_pcm_runtime *runtime = substream->runtime; | |
82 | int transfer_size, trigger_limit; | |
83 | int slot_width; | |
84 | int count = 10; | |
85 | ||
86 | /* The reader should be stopped */ | |
87 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
88 | dev_err(reader->dev, "%s: invalid reader state %d", __func__, | |
89 | reader->state); | |
90 | return -EINVAL; | |
91 | } | |
92 | ||
93 | /* Calculate transfer size (in fifo cells and bytes) for frame count */ | |
94 | transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES; | |
95 | ||
96 | /* Calculate number of empty cells available before asserting DREQ */ | |
97 | if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) | |
98 | trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size; | |
99 | else | |
100 | /* | |
101 | * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0 | |
102 | * FDMA_TRIGGER_LIMIT also controls when the state switches | |
103 | * from OFF or STANDBY to AUDIO DATA. | |
104 | */ | |
105 | trigger_limit = transfer_size; | |
106 | ||
107 | /* Trigger limit must be an even number */ | |
108 | if ((!trigger_limit % 2) || | |
109 | (trigger_limit != 1 && transfer_size % 2) || | |
110 | (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) { | |
111 | dev_err(reader->dev, "invalid trigger limit %d", trigger_limit); | |
112 | return -EINVAL; | |
113 | } | |
114 | ||
115 | SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit); | |
116 | ||
117 | switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) { | |
118 | case SND_SOC_DAIFMT_IB_IF: | |
119 | case SND_SOC_DAIFMT_NB_IF: | |
120 | SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); | |
121 | break; | |
122 | default: | |
123 | SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); | |
124 | } | |
125 | ||
126 | /* Force slot width to 32 in I2S mode */ | |
127 | if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) | |
128 | == SND_SOC_DAIFMT_I2S) { | |
129 | slot_width = 32; | |
130 | } else { | |
131 | switch (runtime->format) { | |
132 | case SNDRV_PCM_FORMAT_S16_LE: | |
133 | slot_width = 16; | |
134 | break; | |
135 | default: | |
136 | slot_width = 32; | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
141 | /* Number of bits per subframe (i.e one channel sample) on input. */ | |
142 | switch (slot_width) { | |
143 | case 32: | |
144 | SET_UNIPERIF_I2S_FMT_NBIT_32(reader); | |
145 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); | |
146 | break; | |
147 | case 16: | |
148 | SET_UNIPERIF_I2S_FMT_NBIT_16(reader); | |
149 | SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader); | |
150 | break; | |
151 | default: | |
152 | dev_err(reader->dev, "subframe format not supported"); | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | /* Configure data memory format */ | |
157 | switch (runtime->format) { | |
158 | case SNDRV_PCM_FORMAT_S16_LE: | |
159 | /* One data word contains two samples */ | |
160 | SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader); | |
161 | break; | |
162 | ||
163 | case SNDRV_PCM_FORMAT_S32_LE: | |
164 | /* | |
165 | * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits | |
166 | * on the MSB then zeros (if less than 32 bytes)"... | |
167 | */ | |
168 | SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); | |
169 | break; | |
170 | ||
171 | default: | |
172 | dev_err(reader->dev, "format not supported"); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
177 | case SND_SOC_DAIFMT_I2S: | |
178 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
179 | SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader); | |
180 | break; | |
181 | case SND_SOC_DAIFMT_LEFT_J: | |
182 | SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); | |
183 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
184 | break; | |
185 | case SND_SOC_DAIFMT_RIGHT_J: | |
186 | SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader); | |
187 | SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); | |
188 | break; | |
189 | default: | |
190 | dev_err(reader->dev, "format not supported"); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); | |
195 | ||
196 | /* Data clocking (changing) on the rising edge */ | |
197 | SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); | |
198 | ||
199 | /* Number of channels must be even */ | |
200 | ||
201 | if ((runtime->channels % 2) || (runtime->channels < 2) || | |
202 | (runtime->channels > 10)) { | |
203 | dev_err(reader->dev, "%s: invalid nb of channels", __func__); | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2); | |
208 | ||
209 | /* Clear any pending interrupts */ | |
210 | SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader)); | |
211 | ||
212 | SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0); | |
213 | ||
214 | /* Set the interrupt mask */ | |
215 | SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader); | |
216 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
217 | SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader); | |
218 | ||
219 | /* Enable underflow recovery interrupts */ | |
220 | if (reader->info->underflow_enabled) { | |
221 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader); | |
222 | SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader); | |
223 | } | |
224 | ||
225 | /* Reset uniperipheral reader */ | |
226 | SET_UNIPERIF_SOFT_RST_SOFT_RST(reader); | |
227 | ||
228 | while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) { | |
229 | udelay(5); | |
230 | count--; | |
231 | } | |
232 | if (!count) { | |
233 | dev_err(reader->dev, "Failed to reset uniperif"); | |
234 | return -EIO; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int uni_reader_start(struct uniperif *reader) | |
241 | { | |
242 | /* The reader should be stopped */ | |
243 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
244 | dev_err(reader->dev, "%s: invalid reader state", __func__); | |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | /* Enable reader interrupts (and clear possible stalled ones) */ | |
249 | SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader); | |
250 | SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); | |
251 | ||
252 | /* Launch the reader */ | |
253 | SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader); | |
254 | ||
255 | /* Update state to started */ | |
256 | reader->state = UNIPERIF_STATE_STARTED; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static int uni_reader_stop(struct uniperif *reader) | |
261 | { | |
262 | /* The reader should not be in stopped state */ | |
263 | if (reader->state == UNIPERIF_STATE_STOPPED) { | |
264 | dev_err(reader->dev, "%s: invalid reader state", __func__); | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | /* Turn the reader off */ | |
269 | SET_UNIPERIF_CTRL_OPERATION_OFF(reader); | |
270 | ||
271 | /* Disable interrupts */ | |
272 | SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader)); | |
273 | ||
274 | /* Update state to stopped and return */ | |
275 | reader->state = UNIPERIF_STATE_STOPPED; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int uni_reader_trigger(struct snd_pcm_substream *substream, | |
281 | int cmd, struct snd_soc_dai *dai) | |
282 | { | |
283 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
284 | struct uniperif *reader = priv->dai_data.uni; | |
285 | ||
286 | switch (cmd) { | |
287 | case SNDRV_PCM_TRIGGER_START: | |
288 | return uni_reader_start(reader); | |
289 | case SNDRV_PCM_TRIGGER_STOP: | |
290 | return uni_reader_stop(reader); | |
291 | default: | |
292 | return -EINVAL; | |
293 | } | |
294 | } | |
295 | ||
296 | static void uni_reader_shutdown(struct snd_pcm_substream *substream, | |
297 | struct snd_soc_dai *dai) | |
298 | { | |
299 | struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); | |
300 | struct uniperif *reader = priv->dai_data.uni; | |
301 | ||
302 | if (reader->state != UNIPERIF_STATE_STOPPED) { | |
303 | /* Stop the reader */ | |
304 | uni_reader_stop(reader); | |
305 | } | |
306 | } | |
307 | ||
308 | static int uni_reader_parse_dt(struct platform_device *pdev, | |
309 | struct uniperif *reader) | |
310 | { | |
311 | struct uniperif_info *info; | |
312 | struct device_node *node = pdev->dev.of_node; | |
313 | ||
314 | /* Allocate memory for the info structure */ | |
315 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
316 | if (!info) | |
317 | return -ENOMEM; | |
318 | ||
f9f51973 | 319 | if (of_property_read_u32(node, "st,version", &reader->ver) || |
3a0e27d8 AP |
320 | reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) { |
321 | dev_err(&pdev->dev, "Unknown uniperipheral version "); | |
322 | return -EINVAL; | |
323 | } | |
c3a0003a AP |
324 | |
325 | /* Save the info structure */ | |
326 | reader->info = info; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
f2da4542 | 331 | static const struct snd_soc_dai_ops uni_reader_dai_ops = { |
c3a0003a AP |
332 | .shutdown = uni_reader_shutdown, |
333 | .prepare = uni_reader_prepare, | |
334 | .trigger = uni_reader_trigger, | |
335 | .hw_params = sti_uniperiph_dai_hw_params, | |
336 | .set_fmt = sti_uniperiph_dai_set_fmt, | |
337 | }; | |
338 | ||
339 | int uni_reader_init(struct platform_device *pdev, | |
340 | struct uniperif *reader) | |
341 | { | |
342 | int ret = 0; | |
343 | ||
344 | reader->dev = &pdev->dev; | |
345 | reader->state = UNIPERIF_STATE_STOPPED; | |
346 | reader->hw = &uni_reader_pcm_hw; | |
347 | reader->dai_ops = &uni_reader_dai_ops; | |
348 | ||
c3a0003a AP |
349 | ret = uni_reader_parse_dt(pdev, reader); |
350 | if (ret < 0) { | |
351 | dev_err(reader->dev, "Failed to parse DeviceTree"); | |
352 | return ret; | |
353 | } | |
354 | ||
355 | ret = devm_request_irq(&pdev->dev, reader->irq, | |
356 | uni_reader_irq_handler, IRQF_SHARED, | |
357 | dev_name(&pdev->dev), reader); | |
358 | if (ret < 0) { | |
359 | dev_err(&pdev->dev, "Failed to request IRQ"); | |
360 | return -EBUSY; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(uni_reader_init); |