Commit | Line | Data |
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4ede028f | 1 | /* |
128ed6a9 | 2 | * Driver for Atmel AC97C |
4ede028f HCE |
3 | * |
4 | * Copyright (C) 2005-2009 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/clk.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/bitmap.h> | |
128ed6a9 | 13 | #include <linux/device.h> |
4ede028f HCE |
14 | #include <linux/dmaengine.h> |
15 | #include <linux/dma-mapping.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/gpio.h> | |
22 | #include <linux/io.h> | |
23 | ||
24 | #include <sound/core.h> | |
25 | #include <sound/initval.h> | |
26 | #include <sound/pcm.h> | |
27 | #include <sound/pcm_params.h> | |
28 | #include <sound/ac97_codec.h> | |
29 | #include <sound/atmel-ac97c.h> | |
30 | #include <sound/memalloc.h> | |
31 | ||
32 | #include <linux/dw_dmac.h> | |
33 | ||
34 | #include "ac97c.h" | |
35 | ||
36 | enum { | |
37 | DMA_TX_READY = 0, | |
38 | DMA_RX_READY, | |
39 | DMA_TX_CHAN_PRESENT, | |
40 | DMA_RX_CHAN_PRESENT, | |
41 | }; | |
42 | ||
43 | /* Serialize access to opened variable */ | |
44 | static DEFINE_MUTEX(opened_mutex); | |
45 | ||
46 | struct atmel_ac97c_dma { | |
47 | struct dma_chan *rx_chan; | |
48 | struct dma_chan *tx_chan; | |
49 | }; | |
50 | ||
51 | struct atmel_ac97c { | |
52 | struct clk *pclk; | |
53 | struct platform_device *pdev; | |
54 | struct atmel_ac97c_dma dma; | |
55 | ||
56 | struct snd_pcm_substream *playback_substream; | |
57 | struct snd_pcm_substream *capture_substream; | |
58 | struct snd_card *card; | |
59 | struct snd_pcm *pcm; | |
60 | struct snd_ac97 *ac97; | |
61 | struct snd_ac97_bus *ac97_bus; | |
62 | ||
63 | u64 cur_format; | |
64 | unsigned int cur_rate; | |
65 | unsigned long flags; | |
66 | /* Serialize access to opened variable */ | |
67 | spinlock_t lock; | |
68 | void __iomem *regs; | |
69 | int opened; | |
70 | int reset_pin; | |
71 | }; | |
72 | ||
73 | #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) | |
74 | ||
75 | #define ac97c_writel(chip, reg, val) \ | |
76 | __raw_writel((val), (chip)->regs + AC97C_##reg) | |
77 | #define ac97c_readl(chip, reg) \ | |
78 | __raw_readl((chip)->regs + AC97C_##reg) | |
79 | ||
80 | /* This function is called by the DMA driver. */ | |
81 | static void atmel_ac97c_dma_playback_period_done(void *arg) | |
82 | { | |
83 | struct atmel_ac97c *chip = arg; | |
84 | snd_pcm_period_elapsed(chip->playback_substream); | |
85 | } | |
86 | ||
87 | static void atmel_ac97c_dma_capture_period_done(void *arg) | |
88 | { | |
89 | struct atmel_ac97c *chip = arg; | |
90 | snd_pcm_period_elapsed(chip->capture_substream); | |
91 | } | |
92 | ||
93 | static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, | |
94 | struct snd_pcm_substream *substream, | |
95 | enum dma_data_direction direction) | |
96 | { | |
97 | struct dma_chan *chan; | |
98 | struct dw_cyclic_desc *cdesc; | |
99 | struct snd_pcm_runtime *runtime = substream->runtime; | |
100 | unsigned long buffer_len, period_len; | |
101 | ||
102 | /* | |
103 | * We don't do DMA on "complex" transfers, i.e. with | |
104 | * non-halfword-aligned buffers or lengths. | |
105 | */ | |
106 | if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { | |
107 | dev_dbg(&chip->pdev->dev, "too complex transfer\n"); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | if (direction == DMA_TO_DEVICE) | |
112 | chan = chip->dma.tx_chan; | |
113 | else | |
114 | chan = chip->dma.rx_chan; | |
115 | ||
116 | buffer_len = frames_to_bytes(runtime, runtime->buffer_size); | |
117 | period_len = frames_to_bytes(runtime, runtime->period_size); | |
118 | ||
119 | cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, | |
120 | period_len, direction); | |
121 | if (IS_ERR(cdesc)) { | |
122 | dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); | |
123 | return PTR_ERR(cdesc); | |
124 | } | |
125 | ||
126 | if (direction == DMA_TO_DEVICE) { | |
127 | cdesc->period_callback = atmel_ac97c_dma_playback_period_done; | |
128 | set_bit(DMA_TX_READY, &chip->flags); | |
129 | } else { | |
130 | cdesc->period_callback = atmel_ac97c_dma_capture_period_done; | |
131 | set_bit(DMA_RX_READY, &chip->flags); | |
132 | } | |
133 | ||
134 | cdesc->period_callback_param = chip; | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static struct snd_pcm_hardware atmel_ac97c_hw = { | |
140 | .info = (SNDRV_PCM_INFO_MMAP | |
141 | | SNDRV_PCM_INFO_MMAP_VALID | |
142 | | SNDRV_PCM_INFO_INTERLEAVED | |
143 | | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
144 | | SNDRV_PCM_INFO_JOINT_DUPLEX | |
145 | | SNDRV_PCM_INFO_RESUME | |
146 | | SNDRV_PCM_INFO_PAUSE), | |
147 | .formats = (SNDRV_PCM_FMTBIT_S16_BE | |
148 | | SNDRV_PCM_FMTBIT_S16_LE), | |
149 | .rates = (SNDRV_PCM_RATE_CONTINUOUS), | |
150 | .rate_min = 4000, | |
151 | .rate_max = 48000, | |
152 | .channels_min = 1, | |
153 | .channels_max = 2, | |
154 | .buffer_bytes_max = 64 * 4096, | |
155 | .period_bytes_min = 4096, | |
156 | .period_bytes_max = 4096, | |
157 | .periods_min = 4, | |
158 | .periods_max = 64, | |
159 | }; | |
160 | ||
161 | static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) | |
162 | { | |
163 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
164 | struct snd_pcm_runtime *runtime = substream->runtime; | |
165 | ||
166 | mutex_lock(&opened_mutex); | |
167 | chip->opened++; | |
168 | runtime->hw = atmel_ac97c_hw; | |
169 | if (chip->cur_rate) { | |
170 | runtime->hw.rate_min = chip->cur_rate; | |
171 | runtime->hw.rate_max = chip->cur_rate; | |
172 | } | |
173 | if (chip->cur_format) | |
174 | runtime->hw.formats = (1ULL << chip->cur_format); | |
175 | mutex_unlock(&opened_mutex); | |
176 | chip->playback_substream = substream; | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) | |
181 | { | |
182 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
183 | struct snd_pcm_runtime *runtime = substream->runtime; | |
184 | ||
185 | mutex_lock(&opened_mutex); | |
186 | chip->opened++; | |
187 | runtime->hw = atmel_ac97c_hw; | |
188 | if (chip->cur_rate) { | |
189 | runtime->hw.rate_min = chip->cur_rate; | |
190 | runtime->hw.rate_max = chip->cur_rate; | |
191 | } | |
192 | if (chip->cur_format) | |
193 | runtime->hw.formats = (1ULL << chip->cur_format); | |
194 | mutex_unlock(&opened_mutex); | |
195 | chip->capture_substream = substream; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) | |
200 | { | |
201 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
202 | ||
203 | mutex_lock(&opened_mutex); | |
204 | chip->opened--; | |
205 | if (!chip->opened) { | |
206 | chip->cur_rate = 0; | |
207 | chip->cur_format = 0; | |
208 | } | |
209 | mutex_unlock(&opened_mutex); | |
210 | ||
211 | chip->playback_substream = NULL; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) | |
217 | { | |
218 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
219 | ||
220 | mutex_lock(&opened_mutex); | |
221 | chip->opened--; | |
222 | if (!chip->opened) { | |
223 | chip->cur_rate = 0; | |
224 | chip->cur_format = 0; | |
225 | } | |
226 | mutex_unlock(&opened_mutex); | |
227 | ||
228 | chip->capture_substream = NULL; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, | |
234 | struct snd_pcm_hw_params *hw_params) | |
235 | { | |
236 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
237 | int retval; | |
238 | ||
239 | retval = snd_pcm_lib_malloc_pages(substream, | |
240 | params_buffer_bytes(hw_params)); | |
241 | if (retval < 0) | |
242 | return retval; | |
243 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
244 | if (retval == 1) | |
245 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
246 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
247 | ||
248 | /* Set restrictions to params. */ | |
249 | mutex_lock(&opened_mutex); | |
250 | chip->cur_rate = params_rate(hw_params); | |
251 | chip->cur_format = params_format(hw_params); | |
252 | mutex_unlock(&opened_mutex); | |
253 | ||
254 | return retval; | |
255 | } | |
256 | ||
257 | static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, | |
258 | struct snd_pcm_hw_params *hw_params) | |
259 | { | |
260 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
261 | int retval; | |
262 | ||
263 | retval = snd_pcm_lib_malloc_pages(substream, | |
264 | params_buffer_bytes(hw_params)); | |
265 | if (retval < 0) | |
266 | return retval; | |
267 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
268 | if (retval == 1) | |
269 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
270 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
271 | ||
272 | /* Set restrictions to params. */ | |
273 | mutex_lock(&opened_mutex); | |
274 | chip->cur_rate = params_rate(hw_params); | |
275 | chip->cur_format = params_format(hw_params); | |
276 | mutex_unlock(&opened_mutex); | |
277 | ||
278 | return retval; | |
279 | } | |
280 | ||
281 | static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) | |
282 | { | |
283 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
284 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
285 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
286 | return snd_pcm_lib_free_pages(substream); | |
287 | } | |
288 | ||
289 | static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) | |
290 | { | |
291 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
292 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
293 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
294 | return snd_pcm_lib_free_pages(substream); | |
295 | } | |
296 | ||
297 | static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) | |
298 | { | |
299 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
300 | struct snd_pcm_runtime *runtime = substream->runtime; | |
128ed6a9 | 301 | unsigned long word = ac97c_readl(chip, OCA); |
4ede028f HCE |
302 | int retval; |
303 | ||
128ed6a9 HCE |
304 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
305 | ||
4ede028f HCE |
306 | /* assign channels to AC97C channel A */ |
307 | switch (runtime->channels) { | |
308 | case 1: | |
309 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
310 | break; | |
311 | case 2: | |
312 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
313 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
314 | break; | |
315 | default: | |
316 | /* TODO: support more than two channels */ | |
317 | return -EINVAL; | |
4ede028f HCE |
318 | } |
319 | ac97c_writel(chip, OCA, word); | |
320 | ||
321 | /* configure sample format and size */ | |
322 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
323 | ||
324 | switch (runtime->format) { | |
325 | case SNDRV_PCM_FORMAT_S16_LE: | |
326 | word |= AC97C_CMR_CEM_LITTLE; | |
327 | break; | |
328 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
4ede028f HCE |
329 | word &= ~(AC97C_CMR_CEM_LITTLE); |
330 | break; | |
128ed6a9 HCE |
331 | default: |
332 | word = ac97c_readl(chip, OCA); | |
333 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); | |
334 | ac97c_writel(chip, OCA, word); | |
335 | return -EINVAL; | |
4ede028f HCE |
336 | } |
337 | ||
338 | ac97c_writel(chip, CAMR, word); | |
339 | ||
340 | /* set variable rate if needed */ | |
341 | if (runtime->rate != 48000) { | |
342 | word = ac97c_readl(chip, MR); | |
343 | word |= AC97C_MR_VRA; | |
344 | ac97c_writel(chip, MR, word); | |
345 | } else { | |
346 | word = ac97c_readl(chip, MR); | |
347 | word &= ~(AC97C_MR_VRA); | |
348 | ac97c_writel(chip, MR, word); | |
349 | } | |
350 | ||
351 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, | |
352 | runtime->rate); | |
353 | if (retval) | |
354 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
355 | runtime->rate); | |
356 | ||
357 | if (!test_bit(DMA_TX_READY, &chip->flags)) | |
358 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
359 | DMA_TO_DEVICE); | |
360 | ||
361 | return retval; | |
362 | } | |
363 | ||
364 | static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) | |
365 | { | |
366 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
367 | struct snd_pcm_runtime *runtime = substream->runtime; | |
128ed6a9 | 368 | unsigned long word = ac97c_readl(chip, ICA); |
4ede028f HCE |
369 | int retval; |
370 | ||
128ed6a9 HCE |
371 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
372 | ||
4ede028f HCE |
373 | /* assign channels to AC97C channel A */ |
374 | switch (runtime->channels) { | |
375 | case 1: | |
376 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
377 | break; | |
378 | case 2: | |
379 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
380 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
381 | break; | |
382 | default: | |
383 | /* TODO: support more than two channels */ | |
384 | return -EINVAL; | |
4ede028f HCE |
385 | } |
386 | ac97c_writel(chip, ICA, word); | |
387 | ||
388 | /* configure sample format and size */ | |
389 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
390 | ||
391 | switch (runtime->format) { | |
392 | case SNDRV_PCM_FORMAT_S16_LE: | |
393 | word |= AC97C_CMR_CEM_LITTLE; | |
394 | break; | |
395 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
4ede028f HCE |
396 | word &= ~(AC97C_CMR_CEM_LITTLE); |
397 | break; | |
128ed6a9 HCE |
398 | default: |
399 | word = ac97c_readl(chip, ICA); | |
400 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); | |
401 | ac97c_writel(chip, ICA, word); | |
402 | return -EINVAL; | |
4ede028f HCE |
403 | } |
404 | ||
405 | ac97c_writel(chip, CAMR, word); | |
406 | ||
407 | /* set variable rate if needed */ | |
408 | if (runtime->rate != 48000) { | |
409 | word = ac97c_readl(chip, MR); | |
410 | word |= AC97C_MR_VRA; | |
411 | ac97c_writel(chip, MR, word); | |
412 | } else { | |
413 | word = ac97c_readl(chip, MR); | |
414 | word &= ~(AC97C_MR_VRA); | |
415 | ac97c_writel(chip, MR, word); | |
416 | } | |
417 | ||
418 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, | |
419 | runtime->rate); | |
420 | if (retval) | |
421 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
422 | runtime->rate); | |
423 | ||
424 | if (!test_bit(DMA_RX_READY, &chip->flags)) | |
425 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
426 | DMA_FROM_DEVICE); | |
427 | ||
428 | return retval; | |
429 | } | |
430 | ||
431 | static int | |
432 | atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) | |
433 | { | |
434 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
435 | unsigned long camr; | |
436 | int retval = 0; | |
437 | ||
438 | camr = ac97c_readl(chip, CAMR); | |
439 | ||
440 | switch (cmd) { | |
441 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
442 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
443 | case SNDRV_PCM_TRIGGER_START: | |
444 | retval = dw_dma_cyclic_start(chip->dma.tx_chan); | |
445 | if (retval) | |
446 | goto out; | |
447 | camr |= AC97C_CMR_CENA; | |
448 | break; | |
449 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
450 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
451 | case SNDRV_PCM_TRIGGER_STOP: | |
452 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
453 | if (chip->opened <= 1) | |
454 | camr &= ~AC97C_CMR_CENA; | |
455 | break; | |
456 | default: | |
457 | retval = -EINVAL; | |
458 | goto out; | |
459 | } | |
460 | ||
461 | ac97c_writel(chip, CAMR, camr); | |
462 | out: | |
463 | return retval; | |
464 | } | |
465 | ||
466 | static int | |
467 | atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) | |
468 | { | |
469 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
470 | unsigned long camr; | |
471 | int retval = 0; | |
472 | ||
473 | camr = ac97c_readl(chip, CAMR); | |
474 | ||
475 | switch (cmd) { | |
476 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
477 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
478 | case SNDRV_PCM_TRIGGER_START: | |
479 | retval = dw_dma_cyclic_start(chip->dma.rx_chan); | |
480 | if (retval) | |
481 | goto out; | |
482 | camr |= AC97C_CMR_CENA; | |
483 | break; | |
484 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
485 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
486 | case SNDRV_PCM_TRIGGER_STOP: | |
487 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
488 | if (chip->opened <= 1) | |
489 | camr &= ~AC97C_CMR_CENA; | |
490 | break; | |
491 | default: | |
492 | retval = -EINVAL; | |
493 | break; | |
494 | } | |
495 | ||
496 | ac97c_writel(chip, CAMR, camr); | |
497 | out: | |
498 | return retval; | |
499 | } | |
500 | ||
501 | static snd_pcm_uframes_t | |
502 | atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) | |
503 | { | |
504 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
505 | struct snd_pcm_runtime *runtime = substream->runtime; | |
506 | snd_pcm_uframes_t frames; | |
507 | unsigned long bytes; | |
508 | ||
509 | bytes = dw_dma_get_src_addr(chip->dma.tx_chan); | |
510 | bytes -= runtime->dma_addr; | |
511 | ||
512 | frames = bytes_to_frames(runtime, bytes); | |
513 | if (frames >= runtime->buffer_size) | |
514 | frames -= runtime->buffer_size; | |
515 | return frames; | |
516 | } | |
517 | ||
518 | static snd_pcm_uframes_t | |
519 | atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) | |
520 | { | |
521 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
522 | struct snd_pcm_runtime *runtime = substream->runtime; | |
523 | snd_pcm_uframes_t frames; | |
524 | unsigned long bytes; | |
525 | ||
526 | bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); | |
527 | bytes -= runtime->dma_addr; | |
528 | ||
529 | frames = bytes_to_frames(runtime, bytes); | |
530 | if (frames >= runtime->buffer_size) | |
531 | frames -= runtime->buffer_size; | |
532 | return frames; | |
533 | } | |
534 | ||
535 | static struct snd_pcm_ops atmel_ac97_playback_ops = { | |
536 | .open = atmel_ac97c_playback_open, | |
537 | .close = atmel_ac97c_playback_close, | |
538 | .ioctl = snd_pcm_lib_ioctl, | |
539 | .hw_params = atmel_ac97c_playback_hw_params, | |
540 | .hw_free = atmel_ac97c_playback_hw_free, | |
541 | .prepare = atmel_ac97c_playback_prepare, | |
542 | .trigger = atmel_ac97c_playback_trigger, | |
543 | .pointer = atmel_ac97c_playback_pointer, | |
544 | }; | |
545 | ||
546 | static struct snd_pcm_ops atmel_ac97_capture_ops = { | |
547 | .open = atmel_ac97c_capture_open, | |
548 | .close = atmel_ac97c_capture_close, | |
549 | .ioctl = snd_pcm_lib_ioctl, | |
550 | .hw_params = atmel_ac97c_capture_hw_params, | |
551 | .hw_free = atmel_ac97c_capture_hw_free, | |
552 | .prepare = atmel_ac97c_capture_prepare, | |
553 | .trigger = atmel_ac97c_capture_trigger, | |
554 | .pointer = atmel_ac97c_capture_pointer, | |
555 | }; | |
556 | ||
557 | static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) | |
558 | { | |
559 | struct snd_pcm *pcm; | |
560 | struct snd_pcm_hardware hw = atmel_ac97c_hw; | |
561 | int capture, playback, retval; | |
562 | ||
563 | capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
564 | playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
565 | ||
566 | retval = snd_pcm_new(chip->card, chip->card->shortname, | |
567 | chip->pdev->id, playback, capture, &pcm); | |
568 | if (retval) | |
569 | return retval; | |
570 | ||
571 | if (capture) | |
572 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, | |
573 | &atmel_ac97_capture_ops); | |
574 | if (playback) | |
575 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, | |
576 | &atmel_ac97_playback_ops); | |
577 | ||
578 | retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
579 | &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, | |
580 | hw.buffer_bytes_max); | |
581 | if (retval) | |
582 | return retval; | |
583 | ||
584 | pcm->private_data = chip; | |
585 | pcm->info_flags = 0; | |
586 | strcpy(pcm->name, chip->card->shortname); | |
587 | chip->pcm = pcm; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) | |
593 | { | |
594 | struct snd_ac97_template template; | |
595 | memset(&template, 0, sizeof(template)); | |
596 | template.private_data = chip; | |
597 | return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); | |
598 | } | |
599 | ||
600 | static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, | |
601 | unsigned short val) | |
602 | { | |
603 | struct atmel_ac97c *chip = get_chip(ac97); | |
604 | unsigned long word; | |
605 | int timeout = 40; | |
606 | ||
607 | word = (reg & 0x7f) << 16 | val; | |
608 | ||
609 | do { | |
610 | if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { | |
611 | ac97c_writel(chip, COTHR, word); | |
612 | return; | |
613 | } | |
614 | udelay(1); | |
615 | } while (--timeout); | |
616 | ||
617 | dev_dbg(&chip->pdev->dev, "codec write timeout\n"); | |
618 | } | |
619 | ||
620 | static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, | |
621 | unsigned short reg) | |
622 | { | |
623 | struct atmel_ac97c *chip = get_chip(ac97); | |
624 | unsigned long word; | |
625 | int timeout = 40; | |
626 | int write = 10; | |
627 | ||
628 | word = (0x80 | (reg & 0x7f)) << 16; | |
629 | ||
630 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) | |
631 | ac97c_readl(chip, CORHR); | |
632 | ||
633 | retry_write: | |
634 | timeout = 40; | |
635 | ||
636 | do { | |
637 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { | |
638 | ac97c_writel(chip, COTHR, word); | |
639 | goto read_reg; | |
640 | } | |
641 | udelay(10); | |
642 | } while (--timeout); | |
643 | ||
644 | if (!--write) | |
645 | goto timed_out; | |
646 | goto retry_write; | |
647 | ||
648 | read_reg: | |
649 | do { | |
650 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { | |
651 | unsigned short val = ac97c_readl(chip, CORHR); | |
652 | return val; | |
653 | } | |
654 | udelay(10); | |
655 | } while (--timeout); | |
656 | ||
657 | if (!--write) | |
658 | goto timed_out; | |
659 | goto retry_write; | |
660 | ||
661 | timed_out: | |
662 | dev_dbg(&chip->pdev->dev, "codec read timeout\n"); | |
663 | return 0xffff; | |
664 | } | |
665 | ||
666 | static bool filter(struct dma_chan *chan, void *slave) | |
667 | { | |
668 | struct dw_dma_slave *dws = slave; | |
669 | ||
670 | if (dws->dma_dev == chan->device->dev) { | |
671 | chan->private = dws; | |
672 | return true; | |
673 | } else | |
674 | return false; | |
675 | } | |
676 | ||
677 | static void atmel_ac97c_reset(struct atmel_ac97c *chip) | |
678 | { | |
679 | ac97c_writel(chip, MR, AC97C_MR_WRST); | |
680 | ||
681 | if (gpio_is_valid(chip->reset_pin)) { | |
682 | gpio_set_value(chip->reset_pin, 0); | |
683 | /* AC97 v2.2 specifications says minimum 1 us. */ | |
684 | udelay(10); | |
685 | gpio_set_value(chip->reset_pin, 1); | |
686 | } | |
687 | ||
688 | udelay(1); | |
689 | ac97c_writel(chip, MR, AC97C_MR_ENA); | |
690 | } | |
691 | ||
692 | static int __devinit atmel_ac97c_probe(struct platform_device *pdev) | |
693 | { | |
694 | struct snd_card *card; | |
695 | struct atmel_ac97c *chip; | |
696 | struct resource *regs; | |
697 | struct ac97c_platform_data *pdata; | |
698 | struct clk *pclk; | |
699 | static struct snd_ac97_bus_ops ops = { | |
700 | .write = atmel_ac97c_write, | |
701 | .read = atmel_ac97c_read, | |
702 | }; | |
703 | int retval; | |
704 | ||
705 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
706 | if (!regs) { | |
707 | dev_dbg(&pdev->dev, "no memory resource\n"); | |
708 | return -ENXIO; | |
709 | } | |
710 | ||
711 | pdata = pdev->dev.platform_data; | |
712 | if (!pdata) { | |
713 | dev_dbg(&pdev->dev, "no platform data\n"); | |
714 | return -ENXIO; | |
715 | } | |
716 | ||
717 | pclk = clk_get(&pdev->dev, "pclk"); | |
718 | if (IS_ERR(pclk)) { | |
719 | dev_dbg(&pdev->dev, "no peripheral clock\n"); | |
720 | return PTR_ERR(pclk); | |
721 | } | |
722 | clk_enable(pclk); | |
723 | ||
724 | retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, | |
725 | THIS_MODULE, sizeof(struct atmel_ac97c), &card); | |
726 | if (retval) { | |
727 | dev_dbg(&pdev->dev, "could not create sound card device\n"); | |
728 | goto err_snd_card_new; | |
729 | } | |
730 | ||
731 | chip = get_chip(card); | |
732 | ||
733 | spin_lock_init(&chip->lock); | |
734 | ||
735 | strcpy(card->driver, "Atmel AC97C"); | |
736 | strcpy(card->shortname, "Atmel AC97C"); | |
737 | sprintf(card->longname, "Atmel AC97 controller"); | |
738 | ||
739 | chip->card = card; | |
740 | chip->pclk = pclk; | |
741 | chip->pdev = pdev; | |
742 | chip->regs = ioremap(regs->start, regs->end - regs->start + 1); | |
743 | ||
744 | if (!chip->regs) { | |
745 | dev_dbg(&pdev->dev, "could not remap register memory\n"); | |
746 | goto err_ioremap; | |
747 | } | |
748 | ||
749 | if (gpio_is_valid(pdata->reset_pin)) { | |
750 | if (gpio_request(pdata->reset_pin, "reset_pin")) { | |
751 | dev_dbg(&pdev->dev, "reset pin not available\n"); | |
752 | chip->reset_pin = -ENODEV; | |
753 | } else { | |
754 | gpio_direction_output(pdata->reset_pin, 1); | |
755 | chip->reset_pin = pdata->reset_pin; | |
756 | } | |
757 | } | |
758 | ||
759 | snd_card_set_dev(card, &pdev->dev); | |
760 | ||
761 | retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); | |
762 | if (retval) { | |
763 | dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); | |
764 | goto err_ac97_bus; | |
765 | } | |
766 | ||
767 | atmel_ac97c_reset(chip); | |
768 | ||
769 | retval = atmel_ac97c_mixer_new(chip); | |
770 | if (retval) { | |
771 | dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); | |
772 | goto err_ac97_bus; | |
773 | } | |
774 | ||
775 | if (pdata->rx_dws.dma_dev) { | |
776 | struct dw_dma_slave *dws = &pdata->rx_dws; | |
777 | dma_cap_mask_t mask; | |
778 | ||
779 | dws->rx_reg = regs->start + AC97C_CARHR + 2; | |
780 | ||
781 | dma_cap_zero(mask); | |
782 | dma_cap_set(DMA_SLAVE, mask); | |
783 | ||
784 | chip->dma.rx_chan = dma_request_channel(mask, filter, dws); | |
785 | ||
786 | dev_info(&chip->pdev->dev, "using %s for DMA RX\n", | |
787 | chip->dma.rx_chan->dev->device.bus_id); | |
788 | set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
789 | } | |
790 | ||
791 | if (pdata->tx_dws.dma_dev) { | |
792 | struct dw_dma_slave *dws = &pdata->tx_dws; | |
793 | dma_cap_mask_t mask; | |
794 | ||
795 | dws->tx_reg = regs->start + AC97C_CATHR + 2; | |
796 | ||
797 | dma_cap_zero(mask); | |
798 | dma_cap_set(DMA_SLAVE, mask); | |
799 | ||
800 | chip->dma.tx_chan = dma_request_channel(mask, filter, dws); | |
801 | ||
802 | dev_info(&chip->pdev->dev, "using %s for DMA TX\n", | |
803 | chip->dma.tx_chan->dev->device.bus_id); | |
804 | set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
805 | } | |
806 | ||
807 | if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && | |
808 | !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { | |
809 | dev_dbg(&pdev->dev, "DMA not available\n"); | |
810 | retval = -ENODEV; | |
811 | goto err_dma; | |
812 | } | |
813 | ||
814 | retval = atmel_ac97c_pcm_new(chip); | |
815 | if (retval) { | |
816 | dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); | |
817 | goto err_dma; | |
818 | } | |
819 | ||
820 | retval = snd_card_register(card); | |
821 | if (retval) { | |
822 | dev_dbg(&pdev->dev, "could not register sound card\n"); | |
823 | goto err_ac97_bus; | |
824 | } | |
825 | ||
826 | platform_set_drvdata(pdev, card); | |
827 | ||
828 | dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n", | |
829 | chip->regs); | |
830 | ||
831 | return 0; | |
832 | ||
833 | err_dma: | |
834 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
835 | dma_release_channel(chip->dma.rx_chan); | |
836 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
837 | dma_release_channel(chip->dma.tx_chan); | |
838 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
839 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
840 | chip->dma.rx_chan = NULL; | |
841 | chip->dma.tx_chan = NULL; | |
842 | err_ac97_bus: | |
843 | snd_card_set_dev(card, NULL); | |
844 | ||
845 | if (gpio_is_valid(chip->reset_pin)) | |
846 | gpio_free(chip->reset_pin); | |
847 | ||
848 | iounmap(chip->regs); | |
849 | err_ioremap: | |
850 | snd_card_free(card); | |
851 | err_snd_card_new: | |
852 | clk_disable(pclk); | |
853 | clk_put(pclk); | |
854 | return retval; | |
855 | } | |
856 | ||
857 | #ifdef CONFIG_PM | |
858 | static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) | |
859 | { | |
860 | struct snd_card *card = platform_get_drvdata(pdev); | |
861 | struct atmel_ac97c *chip = card->private_data; | |
862 | ||
863 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
864 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
865 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
866 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
867 | clk_disable(chip->pclk); | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | static int atmel_ac97c_resume(struct platform_device *pdev) | |
873 | { | |
874 | struct snd_card *card = platform_get_drvdata(pdev); | |
875 | struct atmel_ac97c *chip = card->private_data; | |
876 | ||
877 | clk_enable(chip->pclk); | |
878 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
879 | dw_dma_cyclic_start(chip->dma.rx_chan); | |
880 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
881 | dw_dma_cyclic_start(chip->dma.tx_chan); | |
882 | ||
883 | return 0; | |
884 | } | |
885 | #else | |
886 | #define atmel_ac97c_suspend NULL | |
887 | #define atmel_ac97c_resume NULL | |
888 | #endif | |
889 | ||
890 | static int __devexit atmel_ac97c_remove(struct platform_device *pdev) | |
891 | { | |
892 | struct snd_card *card = platform_get_drvdata(pdev); | |
893 | struct atmel_ac97c *chip = get_chip(card); | |
894 | ||
895 | if (gpio_is_valid(chip->reset_pin)) | |
896 | gpio_free(chip->reset_pin); | |
897 | ||
898 | clk_disable(chip->pclk); | |
899 | clk_put(chip->pclk); | |
900 | iounmap(chip->regs); | |
901 | ||
902 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
903 | dma_release_channel(chip->dma.rx_chan); | |
904 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
905 | dma_release_channel(chip->dma.tx_chan); | |
906 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
907 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
908 | chip->dma.rx_chan = NULL; | |
909 | chip->dma.tx_chan = NULL; | |
910 | ||
911 | snd_card_set_dev(card, NULL); | |
912 | snd_card_free(card); | |
913 | ||
914 | platform_set_drvdata(pdev, NULL); | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static struct platform_driver atmel_ac97c_driver = { | |
920 | .remove = __devexit_p(atmel_ac97c_remove), | |
921 | .driver = { | |
922 | .name = "atmel_ac97c", | |
923 | }, | |
924 | .suspend = atmel_ac97c_suspend, | |
925 | .resume = atmel_ac97c_resume, | |
926 | }; | |
927 | ||
928 | static int __init atmel_ac97c_init(void) | |
929 | { | |
930 | return platform_driver_probe(&atmel_ac97c_driver, | |
931 | atmel_ac97c_probe); | |
932 | } | |
933 | module_init(atmel_ac97c_init); | |
934 | ||
935 | static void __exit atmel_ac97c_exit(void) | |
936 | { | |
937 | platform_driver_unregister(&atmel_ac97c_driver); | |
938 | } | |
939 | module_exit(atmel_ac97c_exit); | |
940 | ||
941 | MODULE_LICENSE("GPL"); | |
942 | MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); | |
943 | MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>"); |