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6c742509 SG |
1 | /* |
2 | * atmel_ssc_dai.c -- ALSA SoC ATMEL SSC Audio Layer Platform driver | |
3 | * | |
4 | * Copyright (C) 2005 SAN People | |
5 | * Copyright (C) 2008 Atmel | |
6 | * | |
7 | * Author: Sedji Gaouaou <sedji.gaouaou@atmel.com> | |
8 | * ATMEL CORP. | |
9 | * | |
10 | * Based on at91-ssc.c by | |
11 | * Frank Mandarino <fmandarino@endrelia.com> | |
12 | * Based on pxa2xx Platform drivers by | |
64ca0404 | 13 | * Liam Girdwood <lrg@slimlogic.co.uk> |
6c742509 SG |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | * GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | */ | |
29 | ||
30 | #include <linux/init.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/device.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/clk.h> | |
36 | #include <linux/atmel_pdc.h> | |
37 | ||
38 | #include <linux/atmel-ssc.h> | |
39 | #include <sound/core.h> | |
40 | #include <sound/pcm.h> | |
41 | #include <sound/pcm_params.h> | |
42 | #include <sound/initval.h> | |
43 | #include <sound/soc.h> | |
44 | ||
6c742509 SG |
45 | #include "atmel-pcm.h" |
46 | #include "atmel_ssc_dai.h" | |
47 | ||
48 | ||
6c742509 | 49 | #define NUM_SSC_DEVICES 3 |
6c742509 SG |
50 | |
51 | /* | |
52 | * SSC PDC registers required by the PCM DMA engine. | |
53 | */ | |
54 | static struct atmel_pdc_regs pdc_tx_reg = { | |
55 | .xpr = ATMEL_PDC_TPR, | |
56 | .xcr = ATMEL_PDC_TCR, | |
57 | .xnpr = ATMEL_PDC_TNPR, | |
58 | .xncr = ATMEL_PDC_TNCR, | |
59 | }; | |
60 | ||
61 | static struct atmel_pdc_regs pdc_rx_reg = { | |
62 | .xpr = ATMEL_PDC_RPR, | |
63 | .xcr = ATMEL_PDC_RCR, | |
64 | .xnpr = ATMEL_PDC_RNPR, | |
65 | .xncr = ATMEL_PDC_RNCR, | |
66 | }; | |
67 | ||
68 | /* | |
69 | * SSC & PDC status bits for transmit and receive. | |
70 | */ | |
71 | static struct atmel_ssc_mask ssc_tx_mask = { | |
72 | .ssc_enable = SSC_BIT(CR_TXEN), | |
73 | .ssc_disable = SSC_BIT(CR_TXDIS), | |
74 | .ssc_endx = SSC_BIT(SR_ENDTX), | |
75 | .ssc_endbuf = SSC_BIT(SR_TXBUFE), | |
f1b0dd8b | 76 | .ssc_error = SSC_BIT(SR_OVRUN), |
6c742509 SG |
77 | .pdc_enable = ATMEL_PDC_TXTEN, |
78 | .pdc_disable = ATMEL_PDC_TXTDIS, | |
79 | }; | |
80 | ||
81 | static struct atmel_ssc_mask ssc_rx_mask = { | |
82 | .ssc_enable = SSC_BIT(CR_RXEN), | |
83 | .ssc_disable = SSC_BIT(CR_RXDIS), | |
84 | .ssc_endx = SSC_BIT(SR_ENDRX), | |
85 | .ssc_endbuf = SSC_BIT(SR_RXBUFF), | |
f1b0dd8b | 86 | .ssc_error = SSC_BIT(SR_OVRUN), |
6c742509 SG |
87 | .pdc_enable = ATMEL_PDC_RXTEN, |
88 | .pdc_disable = ATMEL_PDC_RXTDIS, | |
89 | }; | |
90 | ||
91 | ||
92 | /* | |
93 | * DMA parameters. | |
94 | */ | |
95 | static struct atmel_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = { | |
96 | {{ | |
97 | .name = "SSC0 PCM out", | |
98 | .pdc = &pdc_tx_reg, | |
99 | .mask = &ssc_tx_mask, | |
100 | }, | |
101 | { | |
102 | .name = "SSC0 PCM in", | |
103 | .pdc = &pdc_rx_reg, | |
104 | .mask = &ssc_rx_mask, | |
105 | } }, | |
6c742509 SG |
106 | {{ |
107 | .name = "SSC1 PCM out", | |
108 | .pdc = &pdc_tx_reg, | |
109 | .mask = &ssc_tx_mask, | |
110 | }, | |
111 | { | |
112 | .name = "SSC1 PCM in", | |
113 | .pdc = &pdc_rx_reg, | |
114 | .mask = &ssc_rx_mask, | |
115 | } }, | |
116 | {{ | |
117 | .name = "SSC2 PCM out", | |
118 | .pdc = &pdc_tx_reg, | |
119 | .mask = &ssc_tx_mask, | |
120 | }, | |
121 | { | |
122 | .name = "SSC2 PCM in", | |
123 | .pdc = &pdc_rx_reg, | |
124 | .mask = &ssc_rx_mask, | |
125 | } }, | |
6c742509 SG |
126 | }; |
127 | ||
128 | ||
129 | static struct atmel_ssc_info ssc_info[NUM_SSC_DEVICES] = { | |
130 | { | |
131 | .name = "ssc0", | |
132 | .lock = __SPIN_LOCK_UNLOCKED(ssc_info[0].lock), | |
133 | .dir_mask = SSC_DIR_MASK_UNUSED, | |
134 | .initialized = 0, | |
135 | }, | |
6c742509 SG |
136 | { |
137 | .name = "ssc1", | |
138 | .lock = __SPIN_LOCK_UNLOCKED(ssc_info[1].lock), | |
139 | .dir_mask = SSC_DIR_MASK_UNUSED, | |
140 | .initialized = 0, | |
141 | }, | |
142 | { | |
143 | .name = "ssc2", | |
144 | .lock = __SPIN_LOCK_UNLOCKED(ssc_info[2].lock), | |
145 | .dir_mask = SSC_DIR_MASK_UNUSED, | |
146 | .initialized = 0, | |
147 | }, | |
6c742509 SG |
148 | }; |
149 | ||
150 | ||
151 | /* | |
152 | * SSC interrupt handler. Passes PDC interrupts to the DMA | |
153 | * interrupt handler in the PCM driver. | |
154 | */ | |
155 | static irqreturn_t atmel_ssc_interrupt(int irq, void *dev_id) | |
156 | { | |
157 | struct atmel_ssc_info *ssc_p = dev_id; | |
158 | struct atmel_pcm_dma_params *dma_params; | |
159 | u32 ssc_sr; | |
160 | u32 ssc_substream_mask; | |
161 | int i; | |
162 | ||
163 | ssc_sr = (unsigned long)ssc_readl(ssc_p->ssc->regs, SR) | |
164 | & (unsigned long)ssc_readl(ssc_p->ssc->regs, IMR); | |
165 | ||
166 | /* | |
167 | * Loop through the substreams attached to this SSC. If | |
168 | * a DMA-related interrupt occurred on that substream, call | |
169 | * the DMA interrupt handler function, if one has been | |
170 | * registered in the dma_params structure by the PCM driver. | |
171 | */ | |
172 | for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) { | |
173 | dma_params = ssc_p->dma_params[i]; | |
174 | ||
175 | if ((dma_params != NULL) && | |
176 | (dma_params->dma_intr_handler != NULL)) { | |
177 | ssc_substream_mask = (dma_params->mask->ssc_endx | | |
178 | dma_params->mask->ssc_endbuf); | |
179 | if (ssc_sr & ssc_substream_mask) { | |
180 | dma_params->dma_intr_handler(ssc_sr, | |
181 | dma_params-> | |
182 | substream); | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | return IRQ_HANDLED; | |
188 | } | |
189 | ||
190 | ||
191 | /*-------------------------------------------------------------------------*\ | |
192 | * DAI functions | |
193 | \*-------------------------------------------------------------------------*/ | |
194 | /* | |
195 | * Startup. Only that one substream allowed in each direction. | |
196 | */ | |
dee89c4d MB |
197 | static int atmel_ssc_startup(struct snd_pcm_substream *substream, |
198 | struct snd_soc_dai *dai) | |
6c742509 | 199 | { |
f0fba2ad | 200 | struct atmel_ssc_info *ssc_p = &ssc_info[dai->id]; |
01f00d55 BS |
201 | struct atmel_pcm_dma_params *dma_params; |
202 | int dir, dir_mask; | |
6c742509 SG |
203 | |
204 | pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n", | |
205 | ssc_readl(ssc_p->ssc->regs, SR)); | |
206 | ||
01f00d55 BS |
207 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
208 | dir = 0; | |
6c742509 | 209 | dir_mask = SSC_DIR_MASK_PLAYBACK; |
01f00d55 BS |
210 | } else { |
211 | dir = 1; | |
6c742509 | 212 | dir_mask = SSC_DIR_MASK_CAPTURE; |
01f00d55 BS |
213 | } |
214 | ||
215 | dma_params = &ssc_dma_params[dai->id][dir]; | |
216 | dma_params->ssc = ssc_p->ssc; | |
217 | dma_params->substream = substream; | |
218 | ||
219 | ssc_p->dma_params[dir] = dma_params; | |
220 | ||
221 | snd_soc_dai_set_dma_data(dai, substream, dma_params); | |
6c742509 SG |
222 | |
223 | spin_lock_irq(&ssc_p->lock); | |
224 | if (ssc_p->dir_mask & dir_mask) { | |
225 | spin_unlock_irq(&ssc_p->lock); | |
226 | return -EBUSY; | |
227 | } | |
228 | ssc_p->dir_mask |= dir_mask; | |
229 | spin_unlock_irq(&ssc_p->lock); | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Shutdown. Clear DMA parameters and shutdown the SSC if there | |
236 | * are no other substreams open. | |
237 | */ | |
dee89c4d MB |
238 | static void atmel_ssc_shutdown(struct snd_pcm_substream *substream, |
239 | struct snd_soc_dai *dai) | |
6c742509 | 240 | { |
f0fba2ad | 241 | struct atmel_ssc_info *ssc_p = &ssc_info[dai->id]; |
6c742509 SG |
242 | struct atmel_pcm_dma_params *dma_params; |
243 | int dir, dir_mask; | |
244 | ||
245 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
246 | dir = 0; | |
247 | else | |
248 | dir = 1; | |
249 | ||
250 | dma_params = ssc_p->dma_params[dir]; | |
251 | ||
252 | if (dma_params != NULL) { | |
253 | ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable); | |
254 | pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n", | |
255 | (dir ? "receive" : "transmit"), | |
256 | ssc_readl(ssc_p->ssc->regs, SR)); | |
257 | ||
258 | dma_params->ssc = NULL; | |
259 | dma_params->substream = NULL; | |
260 | ssc_p->dma_params[dir] = NULL; | |
261 | } | |
262 | ||
263 | dir_mask = 1 << dir; | |
264 | ||
265 | spin_lock_irq(&ssc_p->lock); | |
266 | ssc_p->dir_mask &= ~dir_mask; | |
267 | if (!ssc_p->dir_mask) { | |
268 | if (ssc_p->initialized) { | |
269 | /* Shutdown the SSC clock. */ | |
270 | pr_debug("atmel_ssc_dau: Stopping clock\n"); | |
271 | clk_disable(ssc_p->ssc->clk); | |
272 | ||
273 | free_irq(ssc_p->ssc->irq, ssc_p); | |
274 | ssc_p->initialized = 0; | |
275 | } | |
276 | ||
277 | /* Reset the SSC */ | |
278 | ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST)); | |
279 | /* Clear the SSC dividers */ | |
280 | ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0; | |
281 | } | |
282 | spin_unlock_irq(&ssc_p->lock); | |
283 | } | |
284 | ||
285 | ||
286 | /* | |
287 | * Record the DAI format for use in hw_params(). | |
288 | */ | |
289 | static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai, | |
290 | unsigned int fmt) | |
291 | { | |
292 | struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id]; | |
293 | ||
294 | ssc_p->daifmt = fmt; | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Record SSC clock dividers for use in hw_params(). | |
300 | */ | |
301 | static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai, | |
302 | int div_id, int div) | |
303 | { | |
304 | struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id]; | |
305 | ||
306 | switch (div_id) { | |
307 | case ATMEL_SSC_CMR_DIV: | |
308 | /* | |
309 | * The same master clock divider is used for both | |
310 | * transmit and receive, so if a value has already | |
311 | * been set, it must match this value. | |
312 | */ | |
313 | if (ssc_p->cmr_div == 0) | |
314 | ssc_p->cmr_div = div; | |
315 | else | |
316 | if (div != ssc_p->cmr_div) | |
317 | return -EBUSY; | |
318 | break; | |
319 | ||
320 | case ATMEL_SSC_TCMR_PERIOD: | |
321 | ssc_p->tcmr_period = div; | |
322 | break; | |
323 | ||
324 | case ATMEL_SSC_RCMR_PERIOD: | |
325 | ssc_p->rcmr_period = div; | |
326 | break; | |
327 | ||
328 | default: | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Configure the SSC. | |
337 | */ | |
338 | static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, | |
dee89c4d MB |
339 | struct snd_pcm_hw_params *params, |
340 | struct snd_soc_dai *dai) | |
6c742509 | 341 | { |
f0fba2ad | 342 | int id = dai->id; |
6c742509 SG |
343 | struct atmel_ssc_info *ssc_p = &ssc_info[id]; |
344 | struct atmel_pcm_dma_params *dma_params; | |
345 | int dir, channels, bits; | |
346 | u32 tfmr, rfmr, tcmr, rcmr; | |
347 | int start_event; | |
348 | int ret; | |
349 | ||
350 | /* | |
351 | * Currently, there is only one set of dma params for | |
352 | * each direction. If more are added, this code will | |
353 | * have to be changed to select the proper set. | |
354 | */ | |
355 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
356 | dir = 0; | |
357 | else | |
358 | dir = 1; | |
359 | ||
01f00d55 | 360 | dma_params = ssc_p->dma_params[dir]; |
6c742509 SG |
361 | |
362 | channels = params_channels(params); | |
363 | ||
364 | /* | |
365 | * Determine sample size in bits and the PDC increment. | |
366 | */ | |
367 | switch (params_format(params)) { | |
368 | case SNDRV_PCM_FORMAT_S8: | |
369 | bits = 8; | |
370 | dma_params->pdc_xfer_size = 1; | |
371 | break; | |
372 | case SNDRV_PCM_FORMAT_S16_LE: | |
373 | bits = 16; | |
374 | dma_params->pdc_xfer_size = 2; | |
375 | break; | |
376 | case SNDRV_PCM_FORMAT_S24_LE: | |
377 | bits = 24; | |
378 | dma_params->pdc_xfer_size = 4; | |
379 | break; | |
380 | case SNDRV_PCM_FORMAT_S32_LE: | |
381 | bits = 32; | |
382 | dma_params->pdc_xfer_size = 4; | |
383 | break; | |
384 | default: | |
385 | printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format"); | |
386 | return -EINVAL; | |
387 | } | |
388 | ||
389 | /* | |
390 | * The SSC only supports up to 16-bit samples in I2S format, due | |
391 | * to the size of the Frame Mode Register FSLEN field. | |
392 | */ | |
393 | if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S | |
394 | && bits > 16) { | |
395 | printk(KERN_WARNING | |
2f2b3cf1 | 396 | "atmel_ssc_dai: sample size %d " |
6c742509 SG |
397 | "is too large for I2S\n", bits); |
398 | return -EINVAL; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Compute SSC register settings. | |
403 | */ | |
404 | switch (ssc_p->daifmt | |
405 | & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) { | |
406 | ||
407 | case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS: | |
408 | /* | |
409 | * I2S format, SSC provides BCLK and LRC clocks. | |
410 | * | |
411 | * The SSC transmit and receive clocks are generated | |
412 | * from the MCK divider, and the BCLK signal | |
413 | * is output on the SSC TK line. | |
414 | */ | |
415 | rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) | |
416 | | SSC_BF(RCMR_STTDLY, START_DELAY) | |
417 | | SSC_BF(RCMR_START, SSC_START_FALLING_RF) | |
418 | | SSC_BF(RCMR_CKI, SSC_CKI_RISING) | |
419 | | SSC_BF(RCMR_CKO, SSC_CKO_NONE) | |
420 | | SSC_BF(RCMR_CKS, SSC_CKS_DIV); | |
421 | ||
422 | rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
423 | | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE) | |
424 | | SSC_BF(RFMR_FSLEN, (bits - 1)) | |
425 | | SSC_BF(RFMR_DATNB, (channels - 1)) | |
426 | | SSC_BIT(RFMR_MSBF) | |
427 | | SSC_BF(RFMR_LOOP, 0) | |
428 | | SSC_BF(RFMR_DATLEN, (bits - 1)); | |
429 | ||
430 | tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) | |
431 | | SSC_BF(TCMR_STTDLY, START_DELAY) | |
432 | | SSC_BF(TCMR_START, SSC_START_FALLING_RF) | |
433 | | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) | |
434 | | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS) | |
435 | | SSC_BF(TCMR_CKS, SSC_CKS_DIV); | |
436 | ||
437 | tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
438 | | SSC_BF(TFMR_FSDEN, 0) | |
439 | | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE) | |
440 | | SSC_BF(TFMR_FSLEN, (bits - 1)) | |
441 | | SSC_BF(TFMR_DATNB, (channels - 1)) | |
442 | | SSC_BIT(TFMR_MSBF) | |
443 | | SSC_BF(TFMR_DATDEF, 0) | |
444 | | SSC_BF(TFMR_DATLEN, (bits - 1)); | |
445 | break; | |
446 | ||
447 | case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM: | |
448 | /* | |
449 | * I2S format, CODEC supplies BCLK and LRC clocks. | |
450 | * | |
451 | * The SSC transmit clock is obtained from the BCLK signal on | |
452 | * on the TK line, and the SSC receive clock is | |
453 | * generated from the transmit clock. | |
454 | * | |
455 | * For single channel data, one sample is transferred | |
456 | * on the falling edge of the LRC clock. | |
457 | * For two channel data, one sample is | |
458 | * transferred on both edges of the LRC clock. | |
459 | */ | |
460 | start_event = ((channels == 1) | |
461 | ? SSC_START_FALLING_RF | |
462 | : SSC_START_EDGE_RF); | |
463 | ||
464 | rcmr = SSC_BF(RCMR_PERIOD, 0) | |
465 | | SSC_BF(RCMR_STTDLY, START_DELAY) | |
466 | | SSC_BF(RCMR_START, start_event) | |
467 | | SSC_BF(RCMR_CKI, SSC_CKI_RISING) | |
468 | | SSC_BF(RCMR_CKO, SSC_CKO_NONE) | |
469 | | SSC_BF(RCMR_CKS, SSC_CKS_CLOCK); | |
470 | ||
471 | rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
472 | | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE) | |
473 | | SSC_BF(RFMR_FSLEN, 0) | |
474 | | SSC_BF(RFMR_DATNB, 0) | |
475 | | SSC_BIT(RFMR_MSBF) | |
476 | | SSC_BF(RFMR_LOOP, 0) | |
477 | | SSC_BF(RFMR_DATLEN, (bits - 1)); | |
478 | ||
479 | tcmr = SSC_BF(TCMR_PERIOD, 0) | |
480 | | SSC_BF(TCMR_STTDLY, START_DELAY) | |
481 | | SSC_BF(TCMR_START, start_event) | |
482 | | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) | |
483 | | SSC_BF(TCMR_CKO, SSC_CKO_NONE) | |
484 | | SSC_BF(TCMR_CKS, SSC_CKS_PIN); | |
485 | ||
486 | tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
487 | | SSC_BF(TFMR_FSDEN, 0) | |
488 | | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE) | |
489 | | SSC_BF(TFMR_FSLEN, 0) | |
490 | | SSC_BF(TFMR_DATNB, 0) | |
491 | | SSC_BIT(TFMR_MSBF) | |
492 | | SSC_BF(TFMR_DATDEF, 0) | |
493 | | SSC_BF(TFMR_DATLEN, (bits - 1)); | |
494 | break; | |
495 | ||
496 | case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS: | |
497 | /* | |
498 | * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks. | |
499 | * | |
500 | * The SSC transmit and receive clocks are generated from the | |
501 | * MCK divider, and the BCLK signal is output | |
502 | * on the SSC TK line. | |
503 | */ | |
504 | rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) | |
505 | | SSC_BF(RCMR_STTDLY, 1) | |
506 | | SSC_BF(RCMR_START, SSC_START_RISING_RF) | |
507 | | SSC_BF(RCMR_CKI, SSC_CKI_RISING) | |
508 | | SSC_BF(RCMR_CKO, SSC_CKO_NONE) | |
509 | | SSC_BF(RCMR_CKS, SSC_CKS_DIV); | |
510 | ||
511 | rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
512 | | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE) | |
513 | | SSC_BF(RFMR_FSLEN, 0) | |
514 | | SSC_BF(RFMR_DATNB, (channels - 1)) | |
515 | | SSC_BIT(RFMR_MSBF) | |
516 | | SSC_BF(RFMR_LOOP, 0) | |
517 | | SSC_BF(RFMR_DATLEN, (bits - 1)); | |
518 | ||
519 | tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) | |
520 | | SSC_BF(TCMR_STTDLY, 1) | |
521 | | SSC_BF(TCMR_START, SSC_START_RISING_RF) | |
522 | | SSC_BF(TCMR_CKI, SSC_CKI_RISING) | |
523 | | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS) | |
524 | | SSC_BF(TCMR_CKS, SSC_CKS_DIV); | |
525 | ||
526 | tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
527 | | SSC_BF(TFMR_FSDEN, 0) | |
528 | | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE) | |
529 | | SSC_BF(TFMR_FSLEN, 0) | |
530 | | SSC_BF(TFMR_DATNB, (channels - 1)) | |
531 | | SSC_BIT(TFMR_MSBF) | |
532 | | SSC_BF(TFMR_DATDEF, 0) | |
533 | | SSC_BF(TFMR_DATLEN, (bits - 1)); | |
534 | break; | |
535 | ||
536 | case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM: | |
f6a75d95 ZP |
537 | /* |
538 | * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks. | |
539 | * | |
540 | * The SSC transmit clock is obtained from the BCLK signal on | |
541 | * on the TK line, and the SSC receive clock is | |
542 | * generated from the transmit clock. | |
543 | * | |
544 | * Data is transferred on first BCLK after LRC pulse rising | |
545 | * edge.If stereo, the right channel data is contiguous with | |
546 | * the left channel data. | |
547 | */ | |
548 | rcmr = SSC_BF(RCMR_PERIOD, 0) | |
549 | | SSC_BF(RCMR_STTDLY, START_DELAY) | |
550 | | SSC_BF(RCMR_START, SSC_START_RISING_RF) | |
551 | | SSC_BF(RCMR_CKI, SSC_CKI_RISING) | |
552 | | SSC_BF(RCMR_CKO, SSC_CKO_NONE) | |
553 | | SSC_BF(RCMR_CKS, SSC_CKS_PIN); | |
554 | ||
555 | rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
556 | | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE) | |
557 | | SSC_BF(RFMR_FSLEN, 0) | |
558 | | SSC_BF(RFMR_DATNB, (channels - 1)) | |
559 | | SSC_BIT(RFMR_MSBF) | |
560 | | SSC_BF(RFMR_LOOP, 0) | |
561 | | SSC_BF(RFMR_DATLEN, (bits - 1)); | |
562 | ||
563 | tcmr = SSC_BF(TCMR_PERIOD, 0) | |
564 | | SSC_BF(TCMR_STTDLY, START_DELAY) | |
565 | | SSC_BF(TCMR_START, SSC_START_RISING_RF) | |
566 | | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) | |
567 | | SSC_BF(TCMR_CKO, SSC_CKO_NONE) | |
568 | | SSC_BF(TCMR_CKS, SSC_CKS_PIN); | |
569 | ||
570 | tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) | |
571 | | SSC_BF(TFMR_FSDEN, 0) | |
572 | | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE) | |
573 | | SSC_BF(TFMR_FSLEN, 0) | |
574 | | SSC_BF(TFMR_DATNB, (channels - 1)) | |
575 | | SSC_BIT(TFMR_MSBF) | |
576 | | SSC_BF(TFMR_DATDEF, 0) | |
577 | | SSC_BF(TFMR_DATLEN, (bits - 1)); | |
578 | break; | |
579 | ||
6c742509 SG |
580 | default: |
581 | printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n", | |
582 | ssc_p->daifmt); | |
583 | return -EINVAL; | |
6c742509 SG |
584 | } |
585 | pr_debug("atmel_ssc_hw_params: " | |
586 | "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n", | |
587 | rcmr, rfmr, tcmr, tfmr); | |
588 | ||
589 | if (!ssc_p->initialized) { | |
590 | ||
591 | /* Enable PMC peripheral clock for this SSC */ | |
592 | pr_debug("atmel_ssc_dai: Starting clock\n"); | |
593 | clk_enable(ssc_p->ssc->clk); | |
594 | ||
595 | /* Reset the SSC and its PDC registers */ | |
596 | ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST)); | |
597 | ||
598 | ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0); | |
599 | ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0); | |
600 | ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0); | |
601 | ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0); | |
602 | ||
603 | ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0); | |
604 | ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0); | |
605 | ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0); | |
606 | ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0); | |
607 | ||
608 | ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0, | |
609 | ssc_p->name, ssc_p); | |
610 | if (ret < 0) { | |
611 | printk(KERN_WARNING | |
612 | "atmel_ssc_dai: request_irq failure\n"); | |
613 | pr_debug("Atmel_ssc_dai: Stoping clock\n"); | |
614 | clk_disable(ssc_p->ssc->clk); | |
615 | return ret; | |
616 | } | |
617 | ||
618 | ssc_p->initialized = 1; | |
619 | } | |
620 | ||
621 | /* set SSC clock mode register */ | |
622 | ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div); | |
623 | ||
624 | /* set receive clock mode and format */ | |
625 | ssc_writel(ssc_p->ssc->regs, RCMR, rcmr); | |
626 | ssc_writel(ssc_p->ssc->regs, RFMR, rfmr); | |
627 | ||
628 | /* set transmit clock mode and format */ | |
629 | ssc_writel(ssc_p->ssc->regs, TCMR, tcmr); | |
630 | ssc_writel(ssc_p->ssc->regs, TFMR, tfmr); | |
631 | ||
632 | pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n"); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | ||
dee89c4d MB |
637 | static int atmel_ssc_prepare(struct snd_pcm_substream *substream, |
638 | struct snd_soc_dai *dai) | |
6c742509 | 639 | { |
f0fba2ad | 640 | struct atmel_ssc_info *ssc_p = &ssc_info[dai->id]; |
6c742509 SG |
641 | struct atmel_pcm_dma_params *dma_params; |
642 | int dir; | |
643 | ||
644 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
645 | dir = 0; | |
646 | else | |
647 | dir = 1; | |
648 | ||
649 | dma_params = ssc_p->dma_params[dir]; | |
650 | ||
651 | ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable); | |
cede8d7a | 652 | ssc_writel(ssc_p->ssc->regs, IER, dma_params->mask->ssc_error); |
6c742509 SG |
653 | |
654 | pr_debug("%s enabled SSC_SR=0x%08x\n", | |
655 | dir ? "receive" : "transmit", | |
656 | ssc_readl(ssc_p->ssc->regs, SR)); | |
657 | return 0; | |
658 | } | |
659 | ||
660 | ||
661 | #ifdef CONFIG_PM | |
dc7d7b83 | 662 | static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai) |
6c742509 SG |
663 | { |
664 | struct atmel_ssc_info *ssc_p; | |
665 | ||
666 | if (!cpu_dai->active) | |
667 | return 0; | |
668 | ||
669 | ssc_p = &ssc_info[cpu_dai->id]; | |
670 | ||
671 | /* Save the status register before disabling transmit and receive */ | |
672 | ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR); | |
673 | ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS)); | |
674 | ||
675 | /* Save the current interrupt mask, then disable unmasked interrupts */ | |
676 | ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR); | |
677 | ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr); | |
678 | ||
679 | ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR); | |
680 | ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR); | |
681 | ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR); | |
682 | ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR); | |
683 | ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR); | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | ||
689 | ||
dc7d7b83 | 690 | static int atmel_ssc_resume(struct snd_soc_dai *cpu_dai) |
6c742509 SG |
691 | { |
692 | struct atmel_ssc_info *ssc_p; | |
693 | u32 cr; | |
694 | ||
695 | if (!cpu_dai->active) | |
696 | return 0; | |
697 | ||
698 | ssc_p = &ssc_info[cpu_dai->id]; | |
699 | ||
700 | /* restore SSC register settings */ | |
701 | ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr); | |
702 | ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr); | |
703 | ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr); | |
704 | ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr); | |
705 | ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr); | |
706 | ||
707 | /* re-enable interrupts */ | |
708 | ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr); | |
709 | ||
25985edc | 710 | /* Re-enable receive and transmit as appropriate */ |
6c742509 SG |
711 | cr = 0; |
712 | cr |= | |
713 | (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0; | |
714 | cr |= | |
715 | (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0; | |
716 | ssc_writel(ssc_p->ssc->regs, CR, cr); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | #else /* CONFIG_PM */ | |
721 | # define atmel_ssc_suspend NULL | |
722 | # define atmel_ssc_resume NULL | |
723 | #endif /* CONFIG_PM */ | |
724 | ||
6c742509 SG |
725 | #define ATMEL_SSC_RATES (SNDRV_PCM_RATE_8000_96000) |
726 | ||
727 | #define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\ | |
728 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) | |
729 | ||
85e7652d | 730 | static const struct snd_soc_dai_ops atmel_ssc_dai_ops = { |
6335d055 EM |
731 | .startup = atmel_ssc_startup, |
732 | .shutdown = atmel_ssc_shutdown, | |
733 | .prepare = atmel_ssc_prepare, | |
734 | .hw_params = atmel_ssc_hw_params, | |
735 | .set_fmt = atmel_ssc_set_dai_fmt, | |
736 | .set_clkdiv = atmel_ssc_set_dai_clkdiv, | |
737 | }; | |
738 | ||
be681a82 | 739 | static struct snd_soc_dai_driver atmel_ssc_dai = { |
6c742509 SG |
740 | .suspend = atmel_ssc_suspend, |
741 | .resume = atmel_ssc_resume, | |
742 | .playback = { | |
743 | .channels_min = 1, | |
744 | .channels_max = 2, | |
745 | .rates = ATMEL_SSC_RATES, | |
746 | .formats = ATMEL_SSC_FORMATS,}, | |
747 | .capture = { | |
748 | .channels_min = 1, | |
749 | .channels_max = 2, | |
750 | .rates = ATMEL_SSC_RATES, | |
751 | .formats = ATMEL_SSC_FORMATS,}, | |
6335d055 | 752 | .ops = &atmel_ssc_dai_ops, |
6c742509 | 753 | }; |
6c742509 | 754 | |
a2c662c0 KM |
755 | static const struct snd_soc_component_driver atmel_ssc_component = { |
756 | .name = "atmel-ssc", | |
757 | }; | |
758 | ||
be681a82 | 759 | static int asoc_ssc_init(struct device *dev) |
f0fba2ad | 760 | { |
3951e4aa BS |
761 | struct platform_device *pdev = to_platform_device(dev); |
762 | struct ssc_device *ssc = platform_get_drvdata(pdev); | |
be681a82 BS |
763 | int ret; |
764 | ||
a2c662c0 KM |
765 | ret = snd_soc_register_component(dev, &atmel_ssc_component, |
766 | &atmel_ssc_dai, 1); | |
be681a82 BS |
767 | if (ret) { |
768 | dev_err(dev, "Could not register DAI: %d\n", ret); | |
769 | goto err; | |
770 | } | |
771 | ||
3951e4aa BS |
772 | if (ssc->pdata->use_dma) |
773 | ret = atmel_pcm_dma_platform_register(dev); | |
774 | else | |
775 | ret = atmel_pcm_pdc_platform_register(dev); | |
776 | ||
be681a82 BS |
777 | if (ret) { |
778 | dev_err(dev, "Could not register PCM: %d\n", ret); | |
779 | goto err_unregister_dai; | |
780 | }; | |
f0fba2ad | 781 | |
f0fba2ad | 782 | return 0; |
f0fba2ad | 783 | |
be681a82 | 784 | err_unregister_dai: |
a2c662c0 | 785 | snd_soc_unregister_component(dev); |
be681a82 BS |
786 | err: |
787 | return ret; | |
788 | } | |
f0fba2ad | 789 | |
be681a82 BS |
790 | static void asoc_ssc_exit(struct device *dev) |
791 | { | |
3951e4aa BS |
792 | struct platform_device *pdev = to_platform_device(dev); |
793 | struct ssc_device *ssc = platform_get_drvdata(pdev); | |
794 | ||
795 | if (ssc->pdata->use_dma) | |
796 | atmel_pcm_dma_platform_unregister(dev); | |
797 | else | |
798 | atmel_pcm_pdc_platform_unregister(dev); | |
799 | ||
a2c662c0 | 800 | snd_soc_unregister_component(dev); |
be681a82 | 801 | } |
f0fba2ad | 802 | |
abfa4eae MB |
803 | /** |
804 | * atmel_ssc_set_audio - Allocate the specified SSC for audio use. | |
805 | */ | |
806 | int atmel_ssc_set_audio(int ssc_id) | |
807 | { | |
808 | struct ssc_device *ssc; | |
abfa4eae MB |
809 | int ret; |
810 | ||
abfa4eae MB |
811 | /* If we can grab the SSC briefly to parent the DAI device off it */ |
812 | ssc = ssc_request(ssc_id); | |
be681a82 BS |
813 | if (IS_ERR(ssc)) { |
814 | pr_err("Unable to parent ASoC SSC DAI on SSC: %ld\n", | |
abfa4eae | 815 | PTR_ERR(ssc)); |
be681a82 BS |
816 | return PTR_ERR(ssc); |
817 | } else { | |
818 | ssc_info[ssc_id].ssc = ssc; | |
840d8e5e | 819 | } |
abfa4eae | 820 | |
be681a82 | 821 | ret = asoc_ssc_init(&ssc->pdev->dev); |
abfa4eae MB |
822 | |
823 | return ret; | |
824 | } | |
825 | EXPORT_SYMBOL_GPL(atmel_ssc_set_audio); | |
826 | ||
be681a82 BS |
827 | void atmel_ssc_put_audio(int ssc_id) |
828 | { | |
829 | struct ssc_device *ssc = ssc_info[ssc_id].ssc; | |
830 | ||
be681a82 | 831 | asoc_ssc_exit(&ssc->pdev->dev); |
69706028 | 832 | ssc_free(ssc); |
be681a82 BS |
833 | } |
834 | EXPORT_SYMBOL_GPL(atmel_ssc_put_audio); | |
3f4b783c | 835 | |
6c742509 SG |
836 | /* Module information */ |
837 | MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com"); | |
838 | MODULE_DESCRIPTION("ATMEL SSC ASoC Interface"); | |
839 | MODULE_LICENSE("GPL"); |