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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; | |
df163587 | 69 | int irq; |
4ede028f HCE |
70 | int opened; |
71 | int reset_pin; | |
72 | }; | |
73 | ||
74 | #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) | |
75 | ||
76 | #define ac97c_writel(chip, reg, val) \ | |
77 | __raw_writel((val), (chip)->regs + AC97C_##reg) | |
78 | #define ac97c_readl(chip, reg) \ | |
79 | __raw_readl((chip)->regs + AC97C_##reg) | |
80 | ||
81 | /* This function is called by the DMA driver. */ | |
82 | static void atmel_ac97c_dma_playback_period_done(void *arg) | |
83 | { | |
84 | struct atmel_ac97c *chip = arg; | |
85 | snd_pcm_period_elapsed(chip->playback_substream); | |
86 | } | |
87 | ||
88 | static void atmel_ac97c_dma_capture_period_done(void *arg) | |
89 | { | |
90 | struct atmel_ac97c *chip = arg; | |
91 | snd_pcm_period_elapsed(chip->capture_substream); | |
92 | } | |
93 | ||
94 | static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, | |
95 | struct snd_pcm_substream *substream, | |
96 | enum dma_data_direction direction) | |
97 | { | |
98 | struct dma_chan *chan; | |
99 | struct dw_cyclic_desc *cdesc; | |
100 | struct snd_pcm_runtime *runtime = substream->runtime; | |
101 | unsigned long buffer_len, period_len; | |
102 | ||
103 | /* | |
104 | * We don't do DMA on "complex" transfers, i.e. with | |
105 | * non-halfword-aligned buffers or lengths. | |
106 | */ | |
107 | if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { | |
108 | dev_dbg(&chip->pdev->dev, "too complex transfer\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | if (direction == DMA_TO_DEVICE) | |
113 | chan = chip->dma.tx_chan; | |
114 | else | |
115 | chan = chip->dma.rx_chan; | |
116 | ||
117 | buffer_len = frames_to_bytes(runtime, runtime->buffer_size); | |
118 | period_len = frames_to_bytes(runtime, runtime->period_size); | |
119 | ||
120 | cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, | |
121 | period_len, direction); | |
122 | if (IS_ERR(cdesc)) { | |
123 | dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); | |
124 | return PTR_ERR(cdesc); | |
125 | } | |
126 | ||
127 | if (direction == DMA_TO_DEVICE) { | |
128 | cdesc->period_callback = atmel_ac97c_dma_playback_period_done; | |
129 | set_bit(DMA_TX_READY, &chip->flags); | |
130 | } else { | |
131 | cdesc->period_callback = atmel_ac97c_dma_capture_period_done; | |
132 | set_bit(DMA_RX_READY, &chip->flags); | |
133 | } | |
134 | ||
135 | cdesc->period_callback_param = chip; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static struct snd_pcm_hardware atmel_ac97c_hw = { | |
141 | .info = (SNDRV_PCM_INFO_MMAP | |
142 | | SNDRV_PCM_INFO_MMAP_VALID | |
143 | | SNDRV_PCM_INFO_INTERLEAVED | |
144 | | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
145 | | SNDRV_PCM_INFO_JOINT_DUPLEX | |
146 | | SNDRV_PCM_INFO_RESUME | |
147 | | SNDRV_PCM_INFO_PAUSE), | |
148 | .formats = (SNDRV_PCM_FMTBIT_S16_BE | |
149 | | SNDRV_PCM_FMTBIT_S16_LE), | |
150 | .rates = (SNDRV_PCM_RATE_CONTINUOUS), | |
151 | .rate_min = 4000, | |
152 | .rate_max = 48000, | |
153 | .channels_min = 1, | |
154 | .channels_max = 2, | |
c42eec0f | 155 | .buffer_bytes_max = 2 * 2 * 64 * 2048, |
4ede028f HCE |
156 | .period_bytes_min = 4096, |
157 | .period_bytes_max = 4096, | |
c42eec0f | 158 | .periods_min = 6, |
4ede028f HCE |
159 | .periods_max = 64, |
160 | }; | |
161 | ||
162 | static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) | |
163 | { | |
164 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
165 | struct snd_pcm_runtime *runtime = substream->runtime; | |
166 | ||
167 | mutex_lock(&opened_mutex); | |
168 | chip->opened++; | |
169 | runtime->hw = atmel_ac97c_hw; | |
170 | if (chip->cur_rate) { | |
171 | runtime->hw.rate_min = chip->cur_rate; | |
172 | runtime->hw.rate_max = chip->cur_rate; | |
173 | } | |
174 | if (chip->cur_format) | |
175 | runtime->hw.formats = (1ULL << chip->cur_format); | |
176 | mutex_unlock(&opened_mutex); | |
177 | chip->playback_substream = substream; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) | |
182 | { | |
183 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
184 | struct snd_pcm_runtime *runtime = substream->runtime; | |
185 | ||
186 | mutex_lock(&opened_mutex); | |
187 | chip->opened++; | |
188 | runtime->hw = atmel_ac97c_hw; | |
189 | if (chip->cur_rate) { | |
190 | runtime->hw.rate_min = chip->cur_rate; | |
191 | runtime->hw.rate_max = chip->cur_rate; | |
192 | } | |
193 | if (chip->cur_format) | |
194 | runtime->hw.formats = (1ULL << chip->cur_format); | |
195 | mutex_unlock(&opened_mutex); | |
196 | chip->capture_substream = substream; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) | |
201 | { | |
202 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
203 | ||
204 | mutex_lock(&opened_mutex); | |
205 | chip->opened--; | |
206 | if (!chip->opened) { | |
207 | chip->cur_rate = 0; | |
208 | chip->cur_format = 0; | |
209 | } | |
210 | mutex_unlock(&opened_mutex); | |
211 | ||
212 | chip->playback_substream = NULL; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) | |
218 | { | |
219 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
220 | ||
221 | mutex_lock(&opened_mutex); | |
222 | chip->opened--; | |
223 | if (!chip->opened) { | |
224 | chip->cur_rate = 0; | |
225 | chip->cur_format = 0; | |
226 | } | |
227 | mutex_unlock(&opened_mutex); | |
228 | ||
229 | chip->capture_substream = NULL; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, | |
235 | struct snd_pcm_hw_params *hw_params) | |
236 | { | |
237 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
238 | int retval; | |
239 | ||
240 | retval = snd_pcm_lib_malloc_pages(substream, | |
241 | params_buffer_bytes(hw_params)); | |
242 | if (retval < 0) | |
243 | return retval; | |
244 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
245 | if (retval == 1) | |
246 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
247 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
248 | ||
249 | /* Set restrictions to params. */ | |
250 | mutex_lock(&opened_mutex); | |
251 | chip->cur_rate = params_rate(hw_params); | |
252 | chip->cur_format = params_format(hw_params); | |
253 | mutex_unlock(&opened_mutex); | |
254 | ||
255 | return retval; | |
256 | } | |
257 | ||
258 | static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, | |
259 | struct snd_pcm_hw_params *hw_params) | |
260 | { | |
261 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
262 | int retval; | |
263 | ||
264 | retval = snd_pcm_lib_malloc_pages(substream, | |
265 | params_buffer_bytes(hw_params)); | |
266 | if (retval < 0) | |
267 | return retval; | |
268 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
269 | if (retval == 1) | |
270 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
271 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
272 | ||
273 | /* Set restrictions to params. */ | |
274 | mutex_lock(&opened_mutex); | |
275 | chip->cur_rate = params_rate(hw_params); | |
276 | chip->cur_format = params_format(hw_params); | |
277 | mutex_unlock(&opened_mutex); | |
278 | ||
279 | return retval; | |
280 | } | |
281 | ||
282 | static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) | |
283 | { | |
284 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
285 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
286 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
287 | return snd_pcm_lib_free_pages(substream); | |
288 | } | |
289 | ||
290 | static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) | |
291 | { | |
292 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
293 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
294 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
295 | return snd_pcm_lib_free_pages(substream); | |
296 | } | |
297 | ||
298 | static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) | |
299 | { | |
300 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
301 | struct snd_pcm_runtime *runtime = substream->runtime; | |
128ed6a9 | 302 | unsigned long word = ac97c_readl(chip, OCA); |
4ede028f HCE |
303 | int retval; |
304 | ||
128ed6a9 HCE |
305 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
306 | ||
4ede028f HCE |
307 | /* assign channels to AC97C channel A */ |
308 | switch (runtime->channels) { | |
309 | case 1: | |
310 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
311 | break; | |
312 | case 2: | |
313 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
314 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
315 | break; | |
316 | default: | |
317 | /* TODO: support more than two channels */ | |
318 | return -EINVAL; | |
4ede028f HCE |
319 | } |
320 | ac97c_writel(chip, OCA, word); | |
321 | ||
322 | /* configure sample format and size */ | |
323 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
324 | ||
325 | switch (runtime->format) { | |
326 | case SNDRV_PCM_FORMAT_S16_LE: | |
327 | word |= AC97C_CMR_CEM_LITTLE; | |
328 | break; | |
329 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
4ede028f HCE |
330 | word &= ~(AC97C_CMR_CEM_LITTLE); |
331 | break; | |
128ed6a9 HCE |
332 | default: |
333 | word = ac97c_readl(chip, OCA); | |
334 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); | |
335 | ac97c_writel(chip, OCA, word); | |
336 | return -EINVAL; | |
4ede028f HCE |
337 | } |
338 | ||
df163587 HCE |
339 | /* Enable underrun interrupt on channel A */ |
340 | word |= AC97C_CSR_UNRUN; | |
341 | ||
4ede028f HCE |
342 | ac97c_writel(chip, CAMR, word); |
343 | ||
df163587 HCE |
344 | /* Enable channel A event interrupt */ |
345 | word = ac97c_readl(chip, IMR); | |
346 | word |= AC97C_SR_CAEVT; | |
347 | ac97c_writel(chip, IER, word); | |
348 | ||
4ede028f HCE |
349 | /* set variable rate if needed */ |
350 | if (runtime->rate != 48000) { | |
351 | word = ac97c_readl(chip, MR); | |
352 | word |= AC97C_MR_VRA; | |
353 | ac97c_writel(chip, MR, word); | |
354 | } else { | |
355 | word = ac97c_readl(chip, MR); | |
356 | word &= ~(AC97C_MR_VRA); | |
357 | ac97c_writel(chip, MR, word); | |
358 | } | |
359 | ||
360 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, | |
361 | runtime->rate); | |
362 | if (retval) | |
363 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
364 | runtime->rate); | |
365 | ||
366 | if (!test_bit(DMA_TX_READY, &chip->flags)) | |
367 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
368 | DMA_TO_DEVICE); | |
369 | ||
370 | return retval; | |
371 | } | |
372 | ||
373 | static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) | |
374 | { | |
375 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
376 | struct snd_pcm_runtime *runtime = substream->runtime; | |
128ed6a9 | 377 | unsigned long word = ac97c_readl(chip, ICA); |
4ede028f HCE |
378 | int retval; |
379 | ||
128ed6a9 HCE |
380 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); |
381 | ||
4ede028f HCE |
382 | /* assign channels to AC97C channel A */ |
383 | switch (runtime->channels) { | |
384 | case 1: | |
385 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
386 | break; | |
387 | case 2: | |
388 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
389 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
390 | break; | |
391 | default: | |
392 | /* TODO: support more than two channels */ | |
393 | return -EINVAL; | |
4ede028f HCE |
394 | } |
395 | ac97c_writel(chip, ICA, word); | |
396 | ||
397 | /* configure sample format and size */ | |
398 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
399 | ||
400 | switch (runtime->format) { | |
401 | case SNDRV_PCM_FORMAT_S16_LE: | |
402 | word |= AC97C_CMR_CEM_LITTLE; | |
403 | break; | |
404 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
4ede028f HCE |
405 | word &= ~(AC97C_CMR_CEM_LITTLE); |
406 | break; | |
128ed6a9 HCE |
407 | default: |
408 | word = ac97c_readl(chip, ICA); | |
409 | word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); | |
410 | ac97c_writel(chip, ICA, word); | |
411 | return -EINVAL; | |
4ede028f HCE |
412 | } |
413 | ||
df163587 HCE |
414 | /* Enable overrun interrupt on channel A */ |
415 | word |= AC97C_CSR_OVRUN; | |
416 | ||
4ede028f HCE |
417 | ac97c_writel(chip, CAMR, word); |
418 | ||
df163587 HCE |
419 | /* Enable channel A event interrupt */ |
420 | word = ac97c_readl(chip, IMR); | |
421 | word |= AC97C_SR_CAEVT; | |
422 | ac97c_writel(chip, IER, word); | |
423 | ||
4ede028f HCE |
424 | /* set variable rate if needed */ |
425 | if (runtime->rate != 48000) { | |
426 | word = ac97c_readl(chip, MR); | |
427 | word |= AC97C_MR_VRA; | |
428 | ac97c_writel(chip, MR, word); | |
429 | } else { | |
430 | word = ac97c_readl(chip, MR); | |
431 | word &= ~(AC97C_MR_VRA); | |
432 | ac97c_writel(chip, MR, word); | |
433 | } | |
434 | ||
435 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, | |
436 | runtime->rate); | |
437 | if (retval) | |
438 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
439 | runtime->rate); | |
440 | ||
441 | if (!test_bit(DMA_RX_READY, &chip->flags)) | |
442 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
443 | DMA_FROM_DEVICE); | |
444 | ||
445 | return retval; | |
446 | } | |
447 | ||
448 | static int | |
449 | atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) | |
450 | { | |
451 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
452 | unsigned long camr; | |
453 | int retval = 0; | |
454 | ||
455 | camr = ac97c_readl(chip, CAMR); | |
456 | ||
457 | switch (cmd) { | |
458 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
459 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
460 | case SNDRV_PCM_TRIGGER_START: | |
461 | retval = dw_dma_cyclic_start(chip->dma.tx_chan); | |
462 | if (retval) | |
463 | goto out; | |
464 | camr |= AC97C_CMR_CENA; | |
465 | break; | |
466 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
467 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
468 | case SNDRV_PCM_TRIGGER_STOP: | |
469 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
470 | if (chip->opened <= 1) | |
471 | camr &= ~AC97C_CMR_CENA; | |
472 | break; | |
473 | default: | |
474 | retval = -EINVAL; | |
475 | goto out; | |
476 | } | |
477 | ||
478 | ac97c_writel(chip, CAMR, camr); | |
479 | out: | |
480 | return retval; | |
481 | } | |
482 | ||
483 | static int | |
484 | atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) | |
485 | { | |
486 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
487 | unsigned long camr; | |
488 | int retval = 0; | |
489 | ||
490 | camr = ac97c_readl(chip, CAMR); | |
491 | ||
492 | switch (cmd) { | |
493 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
494 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
495 | case SNDRV_PCM_TRIGGER_START: | |
496 | retval = dw_dma_cyclic_start(chip->dma.rx_chan); | |
497 | if (retval) | |
498 | goto out; | |
499 | camr |= AC97C_CMR_CENA; | |
500 | break; | |
501 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
502 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
503 | case SNDRV_PCM_TRIGGER_STOP: | |
504 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
505 | if (chip->opened <= 1) | |
506 | camr &= ~AC97C_CMR_CENA; | |
507 | break; | |
508 | default: | |
509 | retval = -EINVAL; | |
510 | break; | |
511 | } | |
512 | ||
513 | ac97c_writel(chip, CAMR, camr); | |
514 | out: | |
515 | return retval; | |
516 | } | |
517 | ||
518 | static snd_pcm_uframes_t | |
519 | atmel_ac97c_playback_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_src_addr(chip->dma.tx_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 snd_pcm_uframes_t | |
536 | atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) | |
537 | { | |
538 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
539 | struct snd_pcm_runtime *runtime = substream->runtime; | |
540 | snd_pcm_uframes_t frames; | |
541 | unsigned long bytes; | |
542 | ||
543 | bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); | |
544 | bytes -= runtime->dma_addr; | |
545 | ||
546 | frames = bytes_to_frames(runtime, bytes); | |
547 | if (frames >= runtime->buffer_size) | |
548 | frames -= runtime->buffer_size; | |
549 | return frames; | |
550 | } | |
551 | ||
552 | static struct snd_pcm_ops atmel_ac97_playback_ops = { | |
553 | .open = atmel_ac97c_playback_open, | |
554 | .close = atmel_ac97c_playback_close, | |
555 | .ioctl = snd_pcm_lib_ioctl, | |
556 | .hw_params = atmel_ac97c_playback_hw_params, | |
557 | .hw_free = atmel_ac97c_playback_hw_free, | |
558 | .prepare = atmel_ac97c_playback_prepare, | |
559 | .trigger = atmel_ac97c_playback_trigger, | |
560 | .pointer = atmel_ac97c_playback_pointer, | |
561 | }; | |
562 | ||
563 | static struct snd_pcm_ops atmel_ac97_capture_ops = { | |
564 | .open = atmel_ac97c_capture_open, | |
565 | .close = atmel_ac97c_capture_close, | |
566 | .ioctl = snd_pcm_lib_ioctl, | |
567 | .hw_params = atmel_ac97c_capture_hw_params, | |
568 | .hw_free = atmel_ac97c_capture_hw_free, | |
569 | .prepare = atmel_ac97c_capture_prepare, | |
570 | .trigger = atmel_ac97c_capture_trigger, | |
571 | .pointer = atmel_ac97c_capture_pointer, | |
572 | }; | |
573 | ||
df163587 HCE |
574 | static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) |
575 | { | |
576 | struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; | |
577 | irqreturn_t retval = IRQ_NONE; | |
578 | u32 sr = ac97c_readl(chip, SR); | |
579 | u32 casr = ac97c_readl(chip, CASR); | |
580 | u32 cosr = ac97c_readl(chip, COSR); | |
581 | ||
582 | if (sr & AC97C_SR_CAEVT) { | |
583 | dev_info(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", | |
584 | casr & AC97C_CSR_OVRUN ? " OVRUN" : "", | |
585 | casr & AC97C_CSR_RXRDY ? " RXRDY" : "", | |
586 | casr & AC97C_CSR_UNRUN ? " UNRUN" : "", | |
587 | casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", | |
588 | casr & AC97C_CSR_TXRDY ? " TXRDY" : "", | |
589 | !casr ? " NONE" : ""); | |
590 | retval = IRQ_HANDLED; | |
591 | } | |
592 | ||
593 | if (sr & AC97C_SR_COEVT) { | |
594 | dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", | |
595 | cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", | |
596 | cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", | |
597 | cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", | |
598 | cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", | |
599 | !cosr ? " NONE" : ""); | |
600 | retval = IRQ_HANDLED; | |
601 | } | |
602 | ||
603 | if (retval == IRQ_NONE) { | |
604 | dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " | |
605 | "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); | |
606 | } | |
607 | ||
608 | return retval; | |
609 | } | |
610 | ||
4ede028f HCE |
611 | static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) |
612 | { | |
613 | struct snd_pcm *pcm; | |
614 | struct snd_pcm_hardware hw = atmel_ac97c_hw; | |
615 | int capture, playback, retval; | |
616 | ||
617 | capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
618 | playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
619 | ||
620 | retval = snd_pcm_new(chip->card, chip->card->shortname, | |
621 | chip->pdev->id, playback, capture, &pcm); | |
622 | if (retval) | |
623 | return retval; | |
624 | ||
625 | if (capture) | |
626 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, | |
627 | &atmel_ac97_capture_ops); | |
628 | if (playback) | |
629 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, | |
630 | &atmel_ac97_playback_ops); | |
631 | ||
632 | retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
633 | &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, | |
634 | hw.buffer_bytes_max); | |
635 | if (retval) | |
636 | return retval; | |
637 | ||
638 | pcm->private_data = chip; | |
639 | pcm->info_flags = 0; | |
640 | strcpy(pcm->name, chip->card->shortname); | |
641 | chip->pcm = pcm; | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) | |
647 | { | |
648 | struct snd_ac97_template template; | |
649 | memset(&template, 0, sizeof(template)); | |
650 | template.private_data = chip; | |
651 | return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); | |
652 | } | |
653 | ||
654 | static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, | |
655 | unsigned short val) | |
656 | { | |
657 | struct atmel_ac97c *chip = get_chip(ac97); | |
658 | unsigned long word; | |
659 | int timeout = 40; | |
660 | ||
661 | word = (reg & 0x7f) << 16 | val; | |
662 | ||
663 | do { | |
664 | if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { | |
665 | ac97c_writel(chip, COTHR, word); | |
666 | return; | |
667 | } | |
668 | udelay(1); | |
669 | } while (--timeout); | |
670 | ||
671 | dev_dbg(&chip->pdev->dev, "codec write timeout\n"); | |
672 | } | |
673 | ||
674 | static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, | |
675 | unsigned short reg) | |
676 | { | |
677 | struct atmel_ac97c *chip = get_chip(ac97); | |
678 | unsigned long word; | |
679 | int timeout = 40; | |
680 | int write = 10; | |
681 | ||
682 | word = (0x80 | (reg & 0x7f)) << 16; | |
683 | ||
684 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) | |
685 | ac97c_readl(chip, CORHR); | |
686 | ||
687 | retry_write: | |
688 | timeout = 40; | |
689 | ||
690 | do { | |
691 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { | |
692 | ac97c_writel(chip, COTHR, word); | |
693 | goto read_reg; | |
694 | } | |
695 | udelay(10); | |
696 | } while (--timeout); | |
697 | ||
698 | if (!--write) | |
699 | goto timed_out; | |
700 | goto retry_write; | |
701 | ||
702 | read_reg: | |
703 | do { | |
704 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { | |
705 | unsigned short val = ac97c_readl(chip, CORHR); | |
706 | return val; | |
707 | } | |
708 | udelay(10); | |
709 | } while (--timeout); | |
710 | ||
711 | if (!--write) | |
712 | goto timed_out; | |
713 | goto retry_write; | |
714 | ||
715 | timed_out: | |
716 | dev_dbg(&chip->pdev->dev, "codec read timeout\n"); | |
717 | return 0xffff; | |
718 | } | |
719 | ||
720 | static bool filter(struct dma_chan *chan, void *slave) | |
721 | { | |
722 | struct dw_dma_slave *dws = slave; | |
723 | ||
724 | if (dws->dma_dev == chan->device->dev) { | |
725 | chan->private = dws; | |
726 | return true; | |
727 | } else | |
728 | return false; | |
729 | } | |
730 | ||
731 | static void atmel_ac97c_reset(struct atmel_ac97c *chip) | |
732 | { | |
81baf3a7 HCE |
733 | ac97c_writel(chip, MR, 0); |
734 | ac97c_writel(chip, MR, AC97C_MR_ENA); | |
735 | ac97c_writel(chip, CAMR, 0); | |
736 | ac97c_writel(chip, COMR, 0); | |
4ede028f HCE |
737 | |
738 | if (gpio_is_valid(chip->reset_pin)) { | |
739 | gpio_set_value(chip->reset_pin, 0); | |
740 | /* AC97 v2.2 specifications says minimum 1 us. */ | |
81baf3a7 | 741 | udelay(2); |
4ede028f HCE |
742 | gpio_set_value(chip->reset_pin, 1); |
743 | } | |
4ede028f HCE |
744 | } |
745 | ||
746 | static int __devinit atmel_ac97c_probe(struct platform_device *pdev) | |
747 | { | |
748 | struct snd_card *card; | |
749 | struct atmel_ac97c *chip; | |
750 | struct resource *regs; | |
751 | struct ac97c_platform_data *pdata; | |
752 | struct clk *pclk; | |
753 | static struct snd_ac97_bus_ops ops = { | |
754 | .write = atmel_ac97c_write, | |
755 | .read = atmel_ac97c_read, | |
756 | }; | |
757 | int retval; | |
df163587 | 758 | int irq; |
4ede028f HCE |
759 | |
760 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
761 | if (!regs) { | |
762 | dev_dbg(&pdev->dev, "no memory resource\n"); | |
763 | return -ENXIO; | |
764 | } | |
765 | ||
766 | pdata = pdev->dev.platform_data; | |
767 | if (!pdata) { | |
768 | dev_dbg(&pdev->dev, "no platform data\n"); | |
769 | return -ENXIO; | |
770 | } | |
771 | ||
df163587 HCE |
772 | irq = platform_get_irq(pdev, 0); |
773 | if (irq < 0) { | |
774 | dev_dbg(&pdev->dev, "could not get irq\n"); | |
775 | return -ENXIO; | |
776 | } | |
777 | ||
4ede028f HCE |
778 | pclk = clk_get(&pdev->dev, "pclk"); |
779 | if (IS_ERR(pclk)) { | |
780 | dev_dbg(&pdev->dev, "no peripheral clock\n"); | |
781 | return PTR_ERR(pclk); | |
782 | } | |
783 | clk_enable(pclk); | |
784 | ||
785 | retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, | |
786 | THIS_MODULE, sizeof(struct atmel_ac97c), &card); | |
787 | if (retval) { | |
788 | dev_dbg(&pdev->dev, "could not create sound card device\n"); | |
789 | goto err_snd_card_new; | |
790 | } | |
791 | ||
792 | chip = get_chip(card); | |
793 | ||
df163587 HCE |
794 | retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); |
795 | if (retval) { | |
796 | dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); | |
797 | goto err_request_irq; | |
798 | } | |
799 | chip->irq = irq; | |
800 | ||
4ede028f HCE |
801 | spin_lock_init(&chip->lock); |
802 | ||
803 | strcpy(card->driver, "Atmel AC97C"); | |
804 | strcpy(card->shortname, "Atmel AC97C"); | |
805 | sprintf(card->longname, "Atmel AC97 controller"); | |
806 | ||
807 | chip->card = card; | |
808 | chip->pclk = pclk; | |
809 | chip->pdev = pdev; | |
810 | chip->regs = ioremap(regs->start, regs->end - regs->start + 1); | |
811 | ||
812 | if (!chip->regs) { | |
813 | dev_dbg(&pdev->dev, "could not remap register memory\n"); | |
814 | goto err_ioremap; | |
815 | } | |
816 | ||
817 | if (gpio_is_valid(pdata->reset_pin)) { | |
818 | if (gpio_request(pdata->reset_pin, "reset_pin")) { | |
819 | dev_dbg(&pdev->dev, "reset pin not available\n"); | |
820 | chip->reset_pin = -ENODEV; | |
821 | } else { | |
822 | gpio_direction_output(pdata->reset_pin, 1); | |
823 | chip->reset_pin = pdata->reset_pin; | |
824 | } | |
825 | } | |
826 | ||
827 | snd_card_set_dev(card, &pdev->dev); | |
828 | ||
81baf3a7 HCE |
829 | atmel_ac97c_reset(chip); |
830 | ||
df163587 HCE |
831 | /* Enable overrun interrupt from codec channel */ |
832 | ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); | |
833 | ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); | |
834 | ||
4ede028f HCE |
835 | retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); |
836 | if (retval) { | |
837 | dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); | |
838 | goto err_ac97_bus; | |
839 | } | |
840 | ||
4ede028f HCE |
841 | retval = atmel_ac97c_mixer_new(chip); |
842 | if (retval) { | |
843 | dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); | |
844 | goto err_ac97_bus; | |
845 | } | |
846 | ||
847 | if (pdata->rx_dws.dma_dev) { | |
848 | struct dw_dma_slave *dws = &pdata->rx_dws; | |
849 | dma_cap_mask_t mask; | |
850 | ||
851 | dws->rx_reg = regs->start + AC97C_CARHR + 2; | |
852 | ||
853 | dma_cap_zero(mask); | |
854 | dma_cap_set(DMA_SLAVE, mask); | |
855 | ||
856 | chip->dma.rx_chan = dma_request_channel(mask, filter, dws); | |
857 | ||
858 | dev_info(&chip->pdev->dev, "using %s for DMA RX\n", | |
23572856 | 859 | dev_name(&chip->dma.rx_chan->dev->device)); |
4ede028f HCE |
860 | set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); |
861 | } | |
862 | ||
863 | if (pdata->tx_dws.dma_dev) { | |
864 | struct dw_dma_slave *dws = &pdata->tx_dws; | |
865 | dma_cap_mask_t mask; | |
866 | ||
867 | dws->tx_reg = regs->start + AC97C_CATHR + 2; | |
868 | ||
869 | dma_cap_zero(mask); | |
870 | dma_cap_set(DMA_SLAVE, mask); | |
871 | ||
872 | chip->dma.tx_chan = dma_request_channel(mask, filter, dws); | |
873 | ||
874 | dev_info(&chip->pdev->dev, "using %s for DMA TX\n", | |
23572856 | 875 | dev_name(&chip->dma.tx_chan->dev->device)); |
4ede028f HCE |
876 | set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); |
877 | } | |
878 | ||
879 | if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && | |
880 | !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { | |
881 | dev_dbg(&pdev->dev, "DMA not available\n"); | |
882 | retval = -ENODEV; | |
883 | goto err_dma; | |
884 | } | |
885 | ||
886 | retval = atmel_ac97c_pcm_new(chip); | |
887 | if (retval) { | |
888 | dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); | |
889 | goto err_dma; | |
890 | } | |
891 | ||
892 | retval = snd_card_register(card); | |
893 | if (retval) { | |
894 | dev_dbg(&pdev->dev, "could not register sound card\n"); | |
df163587 | 895 | goto err_dma; |
4ede028f HCE |
896 | } |
897 | ||
898 | platform_set_drvdata(pdev, card); | |
899 | ||
900 | dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n", | |
901 | chip->regs); | |
902 | ||
903 | return 0; | |
904 | ||
905 | err_dma: | |
906 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
907 | dma_release_channel(chip->dma.rx_chan); | |
908 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
909 | dma_release_channel(chip->dma.tx_chan); | |
910 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
911 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
912 | chip->dma.rx_chan = NULL; | |
913 | chip->dma.tx_chan = NULL; | |
914 | err_ac97_bus: | |
915 | snd_card_set_dev(card, NULL); | |
916 | ||
917 | if (gpio_is_valid(chip->reset_pin)) | |
918 | gpio_free(chip->reset_pin); | |
919 | ||
920 | iounmap(chip->regs); | |
921 | err_ioremap: | |
df163587 HCE |
922 | free_irq(irq, chip); |
923 | err_request_irq: | |
4ede028f HCE |
924 | snd_card_free(card); |
925 | err_snd_card_new: | |
926 | clk_disable(pclk); | |
927 | clk_put(pclk); | |
928 | return retval; | |
929 | } | |
930 | ||
931 | #ifdef CONFIG_PM | |
932 | static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) | |
933 | { | |
934 | struct snd_card *card = platform_get_drvdata(pdev); | |
935 | struct atmel_ac97c *chip = card->private_data; | |
936 | ||
937 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
938 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
939 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
940 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
941 | clk_disable(chip->pclk); | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | static int atmel_ac97c_resume(struct platform_device *pdev) | |
947 | { | |
948 | struct snd_card *card = platform_get_drvdata(pdev); | |
949 | struct atmel_ac97c *chip = card->private_data; | |
950 | ||
951 | clk_enable(chip->pclk); | |
952 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
953 | dw_dma_cyclic_start(chip->dma.rx_chan); | |
954 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
955 | dw_dma_cyclic_start(chip->dma.tx_chan); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | #else | |
960 | #define atmel_ac97c_suspend NULL | |
961 | #define atmel_ac97c_resume NULL | |
962 | #endif | |
963 | ||
964 | static int __devexit atmel_ac97c_remove(struct platform_device *pdev) | |
965 | { | |
966 | struct snd_card *card = platform_get_drvdata(pdev); | |
967 | struct atmel_ac97c *chip = get_chip(card); | |
968 | ||
969 | if (gpio_is_valid(chip->reset_pin)) | |
970 | gpio_free(chip->reset_pin); | |
971 | ||
bd74a184 HCE |
972 | ac97c_writel(chip, CAMR, 0); |
973 | ac97c_writel(chip, COMR, 0); | |
974 | ac97c_writel(chip, MR, 0); | |
975 | ||
4ede028f HCE |
976 | clk_disable(chip->pclk); |
977 | clk_put(chip->pclk); | |
978 | iounmap(chip->regs); | |
df163587 | 979 | free_irq(chip->irq, chip); |
4ede028f HCE |
980 | |
981 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
982 | dma_release_channel(chip->dma.rx_chan); | |
983 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
984 | dma_release_channel(chip->dma.tx_chan); | |
985 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
986 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
987 | chip->dma.rx_chan = NULL; | |
988 | chip->dma.tx_chan = NULL; | |
989 | ||
990 | snd_card_set_dev(card, NULL); | |
991 | snd_card_free(card); | |
992 | ||
993 | platform_set_drvdata(pdev, NULL); | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | static struct platform_driver atmel_ac97c_driver = { | |
999 | .remove = __devexit_p(atmel_ac97c_remove), | |
1000 | .driver = { | |
1001 | .name = "atmel_ac97c", | |
1002 | }, | |
1003 | .suspend = atmel_ac97c_suspend, | |
1004 | .resume = atmel_ac97c_resume, | |
1005 | }; | |
1006 | ||
1007 | static int __init atmel_ac97c_init(void) | |
1008 | { | |
1009 | return platform_driver_probe(&atmel_ac97c_driver, | |
1010 | atmel_ac97c_probe); | |
1011 | } | |
1012 | module_init(atmel_ac97c_init); | |
1013 | ||
1014 | static void __exit atmel_ac97c_exit(void) | |
1015 | { | |
1016 | platform_driver_unregister(&atmel_ac97c_driver); | |
1017 | } | |
1018 | module_exit(atmel_ac97c_exit); | |
1019 | ||
1020 | MODULE_LICENSE("GPL"); | |
1021 | MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); | |
1022 | MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>"); |