blob: f791239a30872927b4c117f43ec457da6532b037 [file] [log] [blame]
Arnaud Pouliquenc3a00032015-07-16 11:36:03 +02001/*
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 */
kbuild test robotf2da4542015-07-17 07:44:09 +080020static const struct snd_pcm_hardware uni_reader_pcm_hw = {
Arnaud Pouliquenc3a00032015-07-16 11:36:03 +020021 .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 */
46static 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
76static 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
240static 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
260static 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
280static 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
296static 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
308static 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
Arnaud Pouliquen3a0e27d2015-09-10 09:45:55 +0200319 if (of_property_read_u32(node, "version", &reader->ver) ||
320 reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) {
321 dev_err(&pdev->dev, "Unknown uniperipheral version ");
322 return -EINVAL;
323 }
Arnaud Pouliquenc3a00032015-07-16 11:36:03 +0200324
325 /* Save the info structure */
326 reader->info = info;
327
328 return 0;
329}
330
kbuild test robotf2da4542015-07-17 07:44:09 +0800331static const struct snd_soc_dai_ops uni_reader_dai_ops = {
Arnaud Pouliquenc3a00032015-07-16 11:36:03 +0200332 .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
339int 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
349 dev_err(reader->dev, "%s: enter\n", __func__);
350 ret = uni_reader_parse_dt(pdev, reader);
351 if (ret < 0) {
352 dev_err(reader->dev, "Failed to parse DeviceTree");
353 return ret;
354 }
355
356 ret = devm_request_irq(&pdev->dev, reader->irq,
357 uni_reader_irq_handler, IRQF_SHARED,
358 dev_name(&pdev->dev), reader);
359 if (ret < 0) {
360 dev_err(&pdev->dev, "Failed to request IRQ");
361 return -EBUSY;
362 }
363
364 return 0;
365}
366EXPORT_SYMBOL_GPL(uni_reader_init);