1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for Atmel AC97C |
4 | * |
5 | * Copyright (C) 2005-2009 Atmel Corporation |
6 | */ |
7 | #include <linux/clk.h> |
8 | #include <linux/delay.h> |
9 | #include <linux/bitmap.h> |
10 | #include <linux/device.h> |
11 | #include <linux/atmel_pdc.h> |
12 | #include <linux/gpio/consumer.h> |
13 | #include <linux/init.h> |
14 | #include <linux/interrupt.h> |
15 | #include <linux/mod_devicetable.h> |
16 | #include <linux/module.h> |
17 | #include <linux/platform_device.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/types.h> |
20 | #include <linux/io.h> |
21 | |
22 | #include <sound/core.h> |
23 | #include <sound/initval.h> |
24 | #include <sound/pcm.h> |
25 | #include <sound/pcm_params.h> |
26 | #include <sound/ac97_codec.h> |
27 | #include <sound/memalloc.h> |
28 | |
29 | #include "ac97c.h" |
30 | |
31 | /* Serialize access to opened variable */ |
32 | static DEFINE_MUTEX(opened_mutex); |
33 | |
34 | struct atmel_ac97c { |
35 | struct clk *pclk; |
36 | struct platform_device *pdev; |
37 | |
38 | struct snd_pcm_substream *playback_substream; |
39 | struct snd_pcm_substream *capture_substream; |
40 | struct snd_card *card; |
41 | struct snd_pcm *pcm; |
42 | struct snd_ac97 *ac97; |
43 | struct snd_ac97_bus *ac97_bus; |
44 | |
45 | u64 cur_format; |
46 | unsigned int cur_rate; |
47 | int playback_period, capture_period; |
48 | /* Serialize access to opened variable */ |
49 | spinlock_t lock; |
50 | void __iomem *regs; |
51 | int irq; |
52 | int opened; |
53 | struct gpio_desc *reset_pin; |
54 | }; |
55 | |
56 | #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) |
57 | |
58 | #define ac97c_writel(chip, reg, val) \ |
59 | __raw_writel((val), (chip)->regs + AC97C_##reg) |
60 | #define ac97c_readl(chip, reg) \ |
61 | __raw_readl((chip)->regs + AC97C_##reg) |
62 | |
63 | static const struct snd_pcm_hardware atmel_ac97c_hw = { |
64 | .info = (SNDRV_PCM_INFO_MMAP |
65 | | SNDRV_PCM_INFO_MMAP_VALID |
66 | | SNDRV_PCM_INFO_INTERLEAVED |
67 | | SNDRV_PCM_INFO_BLOCK_TRANSFER |
68 | | SNDRV_PCM_INFO_JOINT_DUPLEX |
69 | | SNDRV_PCM_INFO_RESUME |
70 | | SNDRV_PCM_INFO_PAUSE), |
71 | .formats = (SNDRV_PCM_FMTBIT_S16_BE |
72 | | SNDRV_PCM_FMTBIT_S16_LE), |
73 | .rates = (SNDRV_PCM_RATE_CONTINUOUS), |
74 | .rate_min = 4000, |
75 | .rate_max = 48000, |
76 | .channels_min = 1, |
77 | .channels_max = 2, |
78 | .buffer_bytes_max = 2 * 2 * 64 * 2048, |
79 | .period_bytes_min = 4096, |
80 | .period_bytes_max = 4096, |
81 | .periods_min = 6, |
82 | .periods_max = 64, |
83 | }; |
84 | |
85 | static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) |
86 | { |
87 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
88 | struct snd_pcm_runtime *runtime = substream->runtime; |
89 | |
90 | mutex_lock(&opened_mutex); |
91 | chip->opened++; |
92 | runtime->hw = atmel_ac97c_hw; |
93 | if (chip->cur_rate) { |
94 | runtime->hw.rate_min = chip->cur_rate; |
95 | runtime->hw.rate_max = chip->cur_rate; |
96 | } |
97 | if (chip->cur_format) |
98 | runtime->hw.formats = pcm_format_to_bits(pcm_format: chip->cur_format); |
99 | mutex_unlock(lock: &opened_mutex); |
100 | chip->playback_substream = substream; |
101 | return 0; |
102 | } |
103 | |
104 | static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) |
105 | { |
106 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
107 | struct snd_pcm_runtime *runtime = substream->runtime; |
108 | |
109 | mutex_lock(&opened_mutex); |
110 | chip->opened++; |
111 | runtime->hw = atmel_ac97c_hw; |
112 | if (chip->cur_rate) { |
113 | runtime->hw.rate_min = chip->cur_rate; |
114 | runtime->hw.rate_max = chip->cur_rate; |
115 | } |
116 | if (chip->cur_format) |
117 | runtime->hw.formats = pcm_format_to_bits(pcm_format: chip->cur_format); |
118 | mutex_unlock(lock: &opened_mutex); |
119 | chip->capture_substream = substream; |
120 | return 0; |
121 | } |
122 | |
123 | static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) |
124 | { |
125 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
126 | |
127 | mutex_lock(&opened_mutex); |
128 | chip->opened--; |
129 | if (!chip->opened) { |
130 | chip->cur_rate = 0; |
131 | chip->cur_format = 0; |
132 | } |
133 | mutex_unlock(lock: &opened_mutex); |
134 | |
135 | chip->playback_substream = NULL; |
136 | |
137 | return 0; |
138 | } |
139 | |
140 | static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) |
141 | { |
142 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
143 | |
144 | mutex_lock(&opened_mutex); |
145 | chip->opened--; |
146 | if (!chip->opened) { |
147 | chip->cur_rate = 0; |
148 | chip->cur_format = 0; |
149 | } |
150 | mutex_unlock(lock: &opened_mutex); |
151 | |
152 | chip->capture_substream = NULL; |
153 | |
154 | return 0; |
155 | } |
156 | |
157 | static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, |
158 | struct snd_pcm_hw_params *hw_params) |
159 | { |
160 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
161 | |
162 | /* Set restrictions to params. */ |
163 | mutex_lock(&opened_mutex); |
164 | chip->cur_rate = params_rate(p: hw_params); |
165 | chip->cur_format = params_format(p: hw_params); |
166 | mutex_unlock(lock: &opened_mutex); |
167 | |
168 | return 0; |
169 | } |
170 | |
171 | static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, |
172 | struct snd_pcm_hw_params *hw_params) |
173 | { |
174 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
175 | |
176 | /* Set restrictions to params. */ |
177 | mutex_lock(&opened_mutex); |
178 | chip->cur_rate = params_rate(p: hw_params); |
179 | chip->cur_format = params_format(p: hw_params); |
180 | mutex_unlock(lock: &opened_mutex); |
181 | |
182 | return 0; |
183 | } |
184 | |
185 | static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) |
186 | { |
187 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
188 | struct snd_pcm_runtime *runtime = substream->runtime; |
189 | int block_size = frames_to_bytes(runtime, size: runtime->period_size); |
190 | unsigned long word = ac97c_readl(chip, OCA); |
191 | int retval; |
192 | |
193 | chip->playback_period = 0; |
194 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
195 | |
196 | /* assign channels to AC97C channel A */ |
197 | switch (runtime->channels) { |
198 | case 1: |
199 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); |
200 | break; |
201 | case 2: |
202 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) |
203 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); |
204 | break; |
205 | default: |
206 | /* TODO: support more than two channels */ |
207 | return -EINVAL; |
208 | } |
209 | ac97c_writel(chip, OCA, word); |
210 | |
211 | /* configure sample format and size */ |
212 | word = ac97c_readl(chip, CAMR); |
213 | if (chip->opened <= 1) |
214 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; |
215 | else |
216 | word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; |
217 | |
218 | switch (runtime->format) { |
219 | case SNDRV_PCM_FORMAT_S16_LE: |
220 | break; |
221 | case SNDRV_PCM_FORMAT_S16_BE: |
222 | word &= ~(AC97C_CMR_CEM_LITTLE); |
223 | break; |
224 | default: |
225 | word = ac97c_readl(chip, OCA); |
226 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
227 | ac97c_writel(chip, OCA, word); |
228 | return -EINVAL; |
229 | } |
230 | |
231 | /* Enable underrun interrupt on channel A */ |
232 | word |= AC97C_CSR_UNRUN; |
233 | |
234 | ac97c_writel(chip, CAMR, word); |
235 | |
236 | /* Enable channel A event interrupt */ |
237 | word = ac97c_readl(chip, IMR); |
238 | word |= AC97C_SR_CAEVT; |
239 | ac97c_writel(chip, IER, word); |
240 | |
241 | /* set variable rate if needed */ |
242 | if (runtime->rate != 48000) { |
243 | word = ac97c_readl(chip, MR); |
244 | word |= AC97C_MR_VRA; |
245 | ac97c_writel(chip, MR, word); |
246 | } else { |
247 | word = ac97c_readl(chip, MR); |
248 | word &= ~(AC97C_MR_VRA); |
249 | ac97c_writel(chip, MR, word); |
250 | } |
251 | |
252 | retval = snd_ac97_set_rate(ac97: chip->ac97, AC97_PCM_FRONT_DAC_RATE, |
253 | rate: runtime->rate); |
254 | if (retval) |
255 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n" , |
256 | runtime->rate); |
257 | |
258 | /* Initialize and start the PDC */ |
259 | writel(val: runtime->dma_addr, addr: chip->regs + ATMEL_PDC_TPR); |
260 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TCR); |
261 | writel(val: runtime->dma_addr + block_size, addr: chip->regs + ATMEL_PDC_TNPR); |
262 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TNCR); |
263 | |
264 | return retval; |
265 | } |
266 | |
267 | static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) |
268 | { |
269 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
270 | struct snd_pcm_runtime *runtime = substream->runtime; |
271 | int block_size = frames_to_bytes(runtime, size: runtime->period_size); |
272 | unsigned long word = ac97c_readl(chip, ICA); |
273 | int retval; |
274 | |
275 | chip->capture_period = 0; |
276 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
277 | |
278 | /* assign channels to AC97C channel A */ |
279 | switch (runtime->channels) { |
280 | case 1: |
281 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); |
282 | break; |
283 | case 2: |
284 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) |
285 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); |
286 | break; |
287 | default: |
288 | /* TODO: support more than two channels */ |
289 | return -EINVAL; |
290 | } |
291 | ac97c_writel(chip, ICA, word); |
292 | |
293 | /* configure sample format and size */ |
294 | word = ac97c_readl(chip, CAMR); |
295 | if (chip->opened <= 1) |
296 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; |
297 | else |
298 | word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; |
299 | |
300 | switch (runtime->format) { |
301 | case SNDRV_PCM_FORMAT_S16_LE: |
302 | break; |
303 | case SNDRV_PCM_FORMAT_S16_BE: |
304 | word &= ~(AC97C_CMR_CEM_LITTLE); |
305 | break; |
306 | default: |
307 | word = ac97c_readl(chip, ICA); |
308 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
309 | ac97c_writel(chip, ICA, word); |
310 | return -EINVAL; |
311 | } |
312 | |
313 | /* Enable overrun interrupt on channel A */ |
314 | word |= AC97C_CSR_OVRUN; |
315 | |
316 | ac97c_writel(chip, CAMR, word); |
317 | |
318 | /* Enable channel A event interrupt */ |
319 | word = ac97c_readl(chip, IMR); |
320 | word |= AC97C_SR_CAEVT; |
321 | ac97c_writel(chip, IER, word); |
322 | |
323 | /* set variable rate if needed */ |
324 | if (runtime->rate != 48000) { |
325 | word = ac97c_readl(chip, MR); |
326 | word |= AC97C_MR_VRA; |
327 | ac97c_writel(chip, MR, word); |
328 | } else { |
329 | word = ac97c_readl(chip, MR); |
330 | word &= ~(AC97C_MR_VRA); |
331 | ac97c_writel(chip, MR, word); |
332 | } |
333 | |
334 | retval = snd_ac97_set_rate(ac97: chip->ac97, AC97_PCM_LR_ADC_RATE, |
335 | rate: runtime->rate); |
336 | if (retval) |
337 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n" , |
338 | runtime->rate); |
339 | |
340 | /* Initialize and start the PDC */ |
341 | writel(val: runtime->dma_addr, addr: chip->regs + ATMEL_PDC_RPR); |
342 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RCR); |
343 | writel(val: runtime->dma_addr + block_size, addr: chip->regs + ATMEL_PDC_RNPR); |
344 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RNCR); |
345 | |
346 | return retval; |
347 | } |
348 | |
349 | static int |
350 | atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
351 | { |
352 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
353 | unsigned long camr, ptcr = 0; |
354 | |
355 | camr = ac97c_readl(chip, CAMR); |
356 | |
357 | switch (cmd) { |
358 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
359 | case SNDRV_PCM_TRIGGER_RESUME: |
360 | case SNDRV_PCM_TRIGGER_START: |
361 | ptcr = ATMEL_PDC_TXTEN; |
362 | camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; |
363 | break; |
364 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
365 | case SNDRV_PCM_TRIGGER_SUSPEND: |
366 | case SNDRV_PCM_TRIGGER_STOP: |
367 | ptcr |= ATMEL_PDC_TXTDIS; |
368 | if (chip->opened <= 1) |
369 | camr &= ~AC97C_CMR_CENA; |
370 | break; |
371 | default: |
372 | return -EINVAL; |
373 | } |
374 | |
375 | ac97c_writel(chip, CAMR, camr); |
376 | writel(val: ptcr, addr: chip->regs + ATMEL_PDC_PTCR); |
377 | return 0; |
378 | } |
379 | |
380 | static int |
381 | atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
382 | { |
383 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
384 | unsigned long camr, ptcr = 0; |
385 | |
386 | camr = ac97c_readl(chip, CAMR); |
387 | ptcr = readl(addr: chip->regs + ATMEL_PDC_PTSR); |
388 | |
389 | switch (cmd) { |
390 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
391 | case SNDRV_PCM_TRIGGER_RESUME: |
392 | case SNDRV_PCM_TRIGGER_START: |
393 | ptcr = ATMEL_PDC_RXTEN; |
394 | camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; |
395 | break; |
396 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
397 | case SNDRV_PCM_TRIGGER_SUSPEND: |
398 | case SNDRV_PCM_TRIGGER_STOP: |
399 | ptcr |= ATMEL_PDC_RXTDIS; |
400 | if (chip->opened <= 1) |
401 | camr &= ~AC97C_CMR_CENA; |
402 | break; |
403 | default: |
404 | return -EINVAL; |
405 | } |
406 | |
407 | ac97c_writel(chip, CAMR, camr); |
408 | writel(val: ptcr, addr: chip->regs + ATMEL_PDC_PTCR); |
409 | return 0; |
410 | } |
411 | |
412 | static snd_pcm_uframes_t |
413 | atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) |
414 | { |
415 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
416 | struct snd_pcm_runtime *runtime = substream->runtime; |
417 | snd_pcm_uframes_t frames; |
418 | unsigned long bytes; |
419 | |
420 | bytes = readl(addr: chip->regs + ATMEL_PDC_TPR); |
421 | bytes -= runtime->dma_addr; |
422 | |
423 | frames = bytes_to_frames(runtime, size: bytes); |
424 | if (frames >= runtime->buffer_size) |
425 | frames -= runtime->buffer_size; |
426 | return frames; |
427 | } |
428 | |
429 | static snd_pcm_uframes_t |
430 | atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) |
431 | { |
432 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
433 | struct snd_pcm_runtime *runtime = substream->runtime; |
434 | snd_pcm_uframes_t frames; |
435 | unsigned long bytes; |
436 | |
437 | bytes = readl(addr: chip->regs + ATMEL_PDC_RPR); |
438 | bytes -= runtime->dma_addr; |
439 | |
440 | frames = bytes_to_frames(runtime, size: bytes); |
441 | if (frames >= runtime->buffer_size) |
442 | frames -= runtime->buffer_size; |
443 | return frames; |
444 | } |
445 | |
446 | static const struct snd_pcm_ops atmel_ac97_playback_ops = { |
447 | .open = atmel_ac97c_playback_open, |
448 | .close = atmel_ac97c_playback_close, |
449 | .hw_params = atmel_ac97c_playback_hw_params, |
450 | .prepare = atmel_ac97c_playback_prepare, |
451 | .trigger = atmel_ac97c_playback_trigger, |
452 | .pointer = atmel_ac97c_playback_pointer, |
453 | }; |
454 | |
455 | static const struct snd_pcm_ops atmel_ac97_capture_ops = { |
456 | .open = atmel_ac97c_capture_open, |
457 | .close = atmel_ac97c_capture_close, |
458 | .hw_params = atmel_ac97c_capture_hw_params, |
459 | .prepare = atmel_ac97c_capture_prepare, |
460 | .trigger = atmel_ac97c_capture_trigger, |
461 | .pointer = atmel_ac97c_capture_pointer, |
462 | }; |
463 | |
464 | static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) |
465 | { |
466 | struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; |
467 | irqreturn_t retval = IRQ_NONE; |
468 | u32 sr = ac97c_readl(chip, SR); |
469 | u32 casr = ac97c_readl(chip, CASR); |
470 | u32 cosr = ac97c_readl(chip, COSR); |
471 | u32 camr = ac97c_readl(chip, CAMR); |
472 | |
473 | if (sr & AC97C_SR_CAEVT) { |
474 | struct snd_pcm_runtime *runtime; |
475 | int offset, next_period, block_size; |
476 | dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n" , |
477 | (casr & AC97C_CSR_OVRUN) ? " OVRUN" : "" , |
478 | (casr & AC97C_CSR_RXRDY) ? " RXRDY" : "" , |
479 | (casr & AC97C_CSR_UNRUN) ? " UNRUN" : "" , |
480 | (casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "" , |
481 | (casr & AC97C_CSR_TXRDY) ? " TXRDY" : "" , |
482 | !casr ? " NONE" : "" ); |
483 | if ((casr & camr) & AC97C_CSR_ENDTX) { |
484 | runtime = chip->playback_substream->runtime; |
485 | block_size = frames_to_bytes(runtime, size: runtime->period_size); |
486 | chip->playback_period++; |
487 | |
488 | if (chip->playback_period == runtime->periods) |
489 | chip->playback_period = 0; |
490 | next_period = chip->playback_period + 1; |
491 | if (next_period == runtime->periods) |
492 | next_period = 0; |
493 | |
494 | offset = block_size * next_period; |
495 | |
496 | writel(val: runtime->dma_addr + offset, addr: chip->regs + ATMEL_PDC_TNPR); |
497 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TNCR); |
498 | |
499 | snd_pcm_period_elapsed(substream: chip->playback_substream); |
500 | } |
501 | if ((casr & camr) & AC97C_CSR_ENDRX) { |
502 | runtime = chip->capture_substream->runtime; |
503 | block_size = frames_to_bytes(runtime, size: runtime->period_size); |
504 | chip->capture_period++; |
505 | |
506 | if (chip->capture_period == runtime->periods) |
507 | chip->capture_period = 0; |
508 | next_period = chip->capture_period + 1; |
509 | if (next_period == runtime->periods) |
510 | next_period = 0; |
511 | |
512 | offset = block_size * next_period; |
513 | |
514 | writel(val: runtime->dma_addr + offset, addr: chip->regs + ATMEL_PDC_RNPR); |
515 | writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RNCR); |
516 | snd_pcm_period_elapsed(substream: chip->capture_substream); |
517 | } |
518 | retval = IRQ_HANDLED; |
519 | } |
520 | |
521 | if (sr & AC97C_SR_COEVT) { |
522 | dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n" , |
523 | (cosr & AC97C_CSR_OVRUN) ? " OVRUN" : "" , |
524 | (cosr & AC97C_CSR_RXRDY) ? " RXRDY" : "" , |
525 | (cosr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "" , |
526 | (cosr & AC97C_CSR_TXRDY) ? " TXRDY" : "" , |
527 | !cosr ? " NONE" : "" ); |
528 | retval = IRQ_HANDLED; |
529 | } |
530 | |
531 | if (retval == IRQ_NONE) { |
532 | dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " |
533 | "casr 0x%08x cosr 0x%08x\n" , sr, casr, cosr); |
534 | } |
535 | |
536 | return retval; |
537 | } |
538 | |
539 | static const struct ac97_pcm at91_ac97_pcm_defs[] = { |
540 | /* Playback */ |
541 | { |
542 | .exclusive = 1, |
543 | .r = { { |
544 | .slots = ((1 << AC97_SLOT_PCM_LEFT) |
545 | | (1 << AC97_SLOT_PCM_RIGHT)), |
546 | } }, |
547 | }, |
548 | /* PCM in */ |
549 | { |
550 | .stream = 1, |
551 | .exclusive = 1, |
552 | .r = { { |
553 | .slots = ((1 << AC97_SLOT_PCM_LEFT) |
554 | | (1 << AC97_SLOT_PCM_RIGHT)), |
555 | } } |
556 | }, |
557 | /* Mic in */ |
558 | { |
559 | .stream = 1, |
560 | .exclusive = 1, |
561 | .r = { { |
562 | .slots = (1<<AC97_SLOT_MIC), |
563 | } } |
564 | }, |
565 | }; |
566 | |
567 | static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) |
568 | { |
569 | struct snd_pcm *pcm; |
570 | struct snd_pcm_hardware hw = atmel_ac97c_hw; |
571 | int retval; |
572 | |
573 | retval = snd_ac97_pcm_assign(ac97: chip->ac97_bus, |
574 | ARRAY_SIZE(at91_ac97_pcm_defs), |
575 | pcms: at91_ac97_pcm_defs); |
576 | if (retval) |
577 | return retval; |
578 | |
579 | retval = snd_pcm_new(card: chip->card, id: chip->card->shortname, device: 0, playback_count: 1, capture_count: 1, rpcm: &pcm); |
580 | if (retval) |
581 | return retval; |
582 | |
583 | snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_CAPTURE, ops: &atmel_ac97_capture_ops); |
584 | snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &atmel_ac97_playback_ops); |
585 | |
586 | snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
587 | data: &chip->pdev->dev, size: hw.periods_min * hw.period_bytes_min, |
588 | max: hw.buffer_bytes_max); |
589 | |
590 | pcm->private_data = chip; |
591 | pcm->info_flags = 0; |
592 | strcpy(p: pcm->name, q: chip->card->shortname); |
593 | chip->pcm = pcm; |
594 | |
595 | return 0; |
596 | } |
597 | |
598 | static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) |
599 | { |
600 | struct snd_ac97_template template; |
601 | memset(&template, 0, sizeof(template)); |
602 | template.private_data = chip; |
603 | return snd_ac97_mixer(bus: chip->ac97_bus, template: &template, rac97: &chip->ac97); |
604 | } |
605 | |
606 | static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, |
607 | unsigned short val) |
608 | { |
609 | struct atmel_ac97c *chip = get_chip(ac97); |
610 | unsigned long word; |
611 | int timeout = 40; |
612 | |
613 | word = (reg & 0x7f) << 16 | val; |
614 | |
615 | do { |
616 | if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { |
617 | ac97c_writel(chip, COTHR, word); |
618 | return; |
619 | } |
620 | udelay(1); |
621 | } while (--timeout); |
622 | |
623 | dev_dbg(&chip->pdev->dev, "codec write timeout\n" ); |
624 | } |
625 | |
626 | static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, |
627 | unsigned short reg) |
628 | { |
629 | struct atmel_ac97c *chip = get_chip(ac97); |
630 | unsigned long word; |
631 | int timeout = 40; |
632 | int write = 10; |
633 | |
634 | word = (0x80 | (reg & 0x7f)) << 16; |
635 | |
636 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) |
637 | ac97c_readl(chip, CORHR); |
638 | |
639 | retry_write: |
640 | timeout = 40; |
641 | |
642 | do { |
643 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { |
644 | ac97c_writel(chip, COTHR, word); |
645 | goto read_reg; |
646 | } |
647 | udelay(10); |
648 | } while (--timeout); |
649 | |
650 | if (!--write) |
651 | goto timed_out; |
652 | goto retry_write; |
653 | |
654 | read_reg: |
655 | do { |
656 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { |
657 | unsigned short val = ac97c_readl(chip, CORHR); |
658 | return val; |
659 | } |
660 | udelay(10); |
661 | } while (--timeout); |
662 | |
663 | if (!--write) |
664 | goto timed_out; |
665 | goto retry_write; |
666 | |
667 | timed_out: |
668 | dev_dbg(&chip->pdev->dev, "codec read timeout\n" ); |
669 | return 0xffff; |
670 | } |
671 | |
672 | static void atmel_ac97c_reset(struct atmel_ac97c *chip) |
673 | { |
674 | ac97c_writel(chip, MR, 0); |
675 | ac97c_writel(chip, MR, AC97C_MR_ENA); |
676 | ac97c_writel(chip, CAMR, 0); |
677 | ac97c_writel(chip, COMR, 0); |
678 | |
679 | if (!IS_ERR(ptr: chip->reset_pin)) { |
680 | gpiod_set_value(desc: chip->reset_pin, value: 0); |
681 | /* AC97 v2.2 specifications says minimum 1 us. */ |
682 | udelay(2); |
683 | gpiod_set_value(desc: chip->reset_pin, value: 1); |
684 | } else { |
685 | ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); |
686 | udelay(2); |
687 | ac97c_writel(chip, MR, AC97C_MR_ENA); |
688 | } |
689 | } |
690 | |
691 | static const struct of_device_id atmel_ac97c_dt_ids[] = { |
692 | { .compatible = "atmel,at91sam9263-ac97c" , }, |
693 | { } |
694 | }; |
695 | MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids); |
696 | |
697 | static int atmel_ac97c_probe(struct platform_device *pdev) |
698 | { |
699 | struct device *dev = &pdev->dev; |
700 | struct snd_card *card; |
701 | struct atmel_ac97c *chip; |
702 | struct resource *regs; |
703 | struct clk *pclk; |
704 | static const struct snd_ac97_bus_ops ops = { |
705 | .write = atmel_ac97c_write, |
706 | .read = atmel_ac97c_read, |
707 | }; |
708 | int retval; |
709 | int irq; |
710 | |
711 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
712 | if (!regs) { |
713 | dev_dbg(&pdev->dev, "no memory resource\n" ); |
714 | return -ENXIO; |
715 | } |
716 | |
717 | irq = platform_get_irq(pdev, 0); |
718 | if (irq < 0) { |
719 | dev_dbg(&pdev->dev, "could not get irq: %d\n" , irq); |
720 | return irq; |
721 | } |
722 | |
723 | pclk = clk_get(dev: &pdev->dev, id: "ac97_clk" ); |
724 | if (IS_ERR(ptr: pclk)) { |
725 | dev_dbg(&pdev->dev, "no peripheral clock\n" ); |
726 | return PTR_ERR(ptr: pclk); |
727 | } |
728 | retval = clk_prepare_enable(clk: pclk); |
729 | if (retval) |
730 | goto err_prepare_enable; |
731 | |
732 | retval = snd_card_new(parent: &pdev->dev, SNDRV_DEFAULT_IDX1, |
733 | SNDRV_DEFAULT_STR1, THIS_MODULE, |
734 | extra_size: sizeof(struct atmel_ac97c), card_ret: &card); |
735 | if (retval) { |
736 | dev_dbg(&pdev->dev, "could not create sound card device\n" ); |
737 | goto err_snd_card_new; |
738 | } |
739 | |
740 | chip = get_chip(card); |
741 | |
742 | retval = request_irq(irq, handler: atmel_ac97c_interrupt, flags: 0, name: "AC97C" , dev: chip); |
743 | if (retval) { |
744 | dev_dbg(&pdev->dev, "unable to request irq %d\n" , irq); |
745 | goto err_request_irq; |
746 | } |
747 | chip->irq = irq; |
748 | |
749 | spin_lock_init(&chip->lock); |
750 | |
751 | strcpy(p: card->driver, q: "Atmel AC97C" ); |
752 | strcpy(p: card->shortname, q: "Atmel AC97C" ); |
753 | sprintf(buf: card->longname, fmt: "Atmel AC97 controller" ); |
754 | |
755 | chip->card = card; |
756 | chip->pclk = pclk; |
757 | chip->pdev = pdev; |
758 | chip->regs = ioremap(offset: regs->start, size: resource_size(res: regs)); |
759 | |
760 | if (!chip->regs) { |
761 | dev_dbg(&pdev->dev, "could not remap register memory\n" ); |
762 | retval = -ENOMEM; |
763 | goto err_ioremap; |
764 | } |
765 | |
766 | chip->reset_pin = devm_gpiod_get_index(dev, con_id: "ac97" , idx: 2, flags: GPIOD_OUT_HIGH); |
767 | if (IS_ERR(ptr: chip->reset_pin)) |
768 | dev_dbg(dev, "reset pin not available\n" ); |
769 | |
770 | atmel_ac97c_reset(chip); |
771 | |
772 | /* Enable overrun interrupt from codec channel */ |
773 | ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); |
774 | ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); |
775 | |
776 | retval = snd_ac97_bus(card, num: 0, ops: &ops, private_data: chip, rbus: &chip->ac97_bus); |
777 | if (retval) { |
778 | dev_dbg(&pdev->dev, "could not register on ac97 bus\n" ); |
779 | goto err_ac97_bus; |
780 | } |
781 | |
782 | retval = atmel_ac97c_mixer_new(chip); |
783 | if (retval) { |
784 | dev_dbg(&pdev->dev, "could not register ac97 mixer\n" ); |
785 | goto err_ac97_bus; |
786 | } |
787 | |
788 | retval = atmel_ac97c_pcm_new(chip); |
789 | if (retval) { |
790 | dev_dbg(&pdev->dev, "could not register ac97 pcm device\n" ); |
791 | goto err_ac97_bus; |
792 | } |
793 | |
794 | retval = snd_card_register(card); |
795 | if (retval) { |
796 | dev_dbg(&pdev->dev, "could not register sound card\n" ); |
797 | goto err_ac97_bus; |
798 | } |
799 | |
800 | platform_set_drvdata(pdev, data: card); |
801 | |
802 | dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n" , |
803 | chip->regs, irq); |
804 | |
805 | return 0; |
806 | |
807 | err_ac97_bus: |
808 | iounmap(addr: chip->regs); |
809 | err_ioremap: |
810 | free_irq(irq, chip); |
811 | err_request_irq: |
812 | snd_card_free(card); |
813 | err_snd_card_new: |
814 | clk_disable_unprepare(clk: pclk); |
815 | err_prepare_enable: |
816 | clk_put(clk: pclk); |
817 | return retval; |
818 | } |
819 | |
820 | #ifdef CONFIG_PM_SLEEP |
821 | static int atmel_ac97c_suspend(struct device *pdev) |
822 | { |
823 | struct snd_card *card = dev_get_drvdata(dev: pdev); |
824 | struct atmel_ac97c *chip = card->private_data; |
825 | |
826 | clk_disable_unprepare(clk: chip->pclk); |
827 | return 0; |
828 | } |
829 | |
830 | static int atmel_ac97c_resume(struct device *pdev) |
831 | { |
832 | struct snd_card *card = dev_get_drvdata(dev: pdev); |
833 | struct atmel_ac97c *chip = card->private_data; |
834 | int ret = clk_prepare_enable(clk: chip->pclk); |
835 | |
836 | return ret; |
837 | } |
838 | |
839 | static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); |
840 | #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm |
841 | #else |
842 | #define ATMEL_AC97C_PM_OPS NULL |
843 | #endif |
844 | |
845 | static void atmel_ac97c_remove(struct platform_device *pdev) |
846 | { |
847 | struct snd_card *card = platform_get_drvdata(pdev); |
848 | struct atmel_ac97c *chip = get_chip(card); |
849 | |
850 | ac97c_writel(chip, CAMR, 0); |
851 | ac97c_writel(chip, COMR, 0); |
852 | ac97c_writel(chip, MR, 0); |
853 | |
854 | clk_disable_unprepare(clk: chip->pclk); |
855 | clk_put(clk: chip->pclk); |
856 | iounmap(addr: chip->regs); |
857 | free_irq(chip->irq, chip); |
858 | |
859 | snd_card_free(card); |
860 | } |
861 | |
862 | static struct platform_driver atmel_ac97c_driver = { |
863 | .probe = atmel_ac97c_probe, |
864 | .remove_new = atmel_ac97c_remove, |
865 | .driver = { |
866 | .name = "atmel_ac97c" , |
867 | .pm = ATMEL_AC97C_PM_OPS, |
868 | .of_match_table = atmel_ac97c_dt_ids, |
869 | }, |
870 | }; |
871 | module_platform_driver(atmel_ac97c_driver); |
872 | |
873 | MODULE_LICENSE("GPL" ); |
874 | MODULE_DESCRIPTION("Driver for Atmel AC97 controller" ); |
875 | MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>" ); |
876 | |