1 /*
2  * Driver for audio on multifunction CS5535 companion device
3  * Copyright (C) Jaya Kumar
4  *
5  * Based on Jaroslav Kysela and Takashi Iwai's examples.
6  * This work was sponsored by CIS(M) Sdn Bhd.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21  *
22  * todo: add be fmt support, spdif, pm
23  */
24 
25 #include <linux/init.h>
26 #include <linux/pci.h>
27 #include <sound/core.h>
28 #include <sound/control.h>
29 #include <sound/initval.h>
30 #include <sound/asoundef.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/ac97_codec.h>
34 #include "cs5535audio.h"
35 
36 static const struct snd_pcm_hardware snd_cs5535audio_playback =
37 {
38 	.info =			(
39 				SNDRV_PCM_INFO_MMAP |
40 				SNDRV_PCM_INFO_INTERLEAVED |
41 		 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
42 		 		SNDRV_PCM_INFO_MMAP_VALID |
43 		 		SNDRV_PCM_INFO_PAUSE |
44 				SNDRV_PCM_INFO_RESUME
45 				),
46 	.formats =		(
47 				SNDRV_PCM_FMTBIT_S16_LE
48 				),
49 	.rates =		(
50 				SNDRV_PCM_RATE_CONTINUOUS |
51 				SNDRV_PCM_RATE_8000_48000
52 				),
53 	.rate_min =		4000,
54 	.rate_max =		48000,
55 	.channels_min =		2,
56 	.channels_max =		2,
57 	.buffer_bytes_max =	(128*1024),
58 	.period_bytes_min =	64,
59 	.period_bytes_max =	(64*1024 - 16),
60 	.periods_min =		1,
61 	.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
62 	.fifo_size =		0,
63 };
64 
65 static const struct snd_pcm_hardware snd_cs5535audio_capture =
66 {
67 	.info =			(
68 				SNDRV_PCM_INFO_MMAP |
69 				SNDRV_PCM_INFO_INTERLEAVED |
70 		 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
71 		 		SNDRV_PCM_INFO_MMAP_VALID
72 				),
73 	.formats =		(
74 				SNDRV_PCM_FMTBIT_S16_LE
75 				),
76 	.rates =		(
77 				SNDRV_PCM_RATE_CONTINUOUS |
78 				SNDRV_PCM_RATE_8000_48000
79 				),
80 	.rate_min =		4000,
81 	.rate_max =		48000,
82 	.channels_min =		2,
83 	.channels_max =		2,
84 	.buffer_bytes_max =	(128*1024),
85 	.period_bytes_min =	64,
86 	.period_bytes_max =	(64*1024 - 16),
87 	.periods_min =		1,
88 	.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
89 	.fifo_size =		0,
90 };
91 
92 static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
93 {
94 	int err;
95 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
96 	struct snd_pcm_runtime *runtime = substream->runtime;
97 
98 	runtime->hw = snd_cs5535audio_playback;
99 	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
100 	snd_pcm_limit_hw_rates(runtime);
101 	cs5535au->playback_substream = substream;
102 	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
103 	if ((err = snd_pcm_hw_constraint_integer(runtime,
104 				SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
105 		return err;
106 
107 	return 0;
108 }
109 
110 static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
111 {
112 	return 0;
113 }
114 
115 #define CS5535AUDIO_DESC_LIST_SIZE \
116 	PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
117 
118 static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
119 					 struct cs5535audio_dma *dma,
120 					 struct snd_pcm_substream *substream,
121 					 unsigned int periods,
122 					 unsigned int period_bytes)
123 {
124 	unsigned int i;
125 	u32 addr, desc_addr, jmpprd_addr;
126 	struct cs5535audio_dma_desc *lastdesc;
127 
128 	if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
129 		return -ENOMEM;
130 
131 	if (dma->desc_buf.area == NULL) {
132 		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
133 					snd_dma_pci_data(cs5535au->pci),
134 					CS5535AUDIO_DESC_LIST_SIZE+1,
135 					&dma->desc_buf) < 0)
136 			return -ENOMEM;
137 		dma->period_bytes = dma->periods = 0;
138 	}
139 
140 	if (dma->periods == periods && dma->period_bytes == period_bytes)
141 		return 0;
142 
143 	/* the u32 cast is okay because in snd*create we successfully told
144    	   pci alloc that we're only 32 bit capable so the uppper will be 0 */
145 	addr = (u32) substream->runtime->dma_addr;
146 	desc_addr = (u32) dma->desc_buf.addr;
147 	for (i = 0; i < periods; i++) {
148 		struct cs5535audio_dma_desc *desc =
149 			&((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
150 		desc->addr = cpu_to_le32(addr);
151 		desc->size = cpu_to_le16(period_bytes);
152 		desc->ctlreserved = cpu_to_le16(PRD_EOP);
153 		desc_addr += sizeof(struct cs5535audio_dma_desc);
154 		addr += period_bytes;
155 	}
156 	/* we reserved one dummy descriptor at the end to do the PRD jump */
157 	lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
158 	lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
159 	lastdesc->size = 0;
160 	lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
161 	jmpprd_addr = cpu_to_le32(lastdesc->addr +
162 				  (sizeof(struct cs5535audio_dma_desc)*periods));
163 
164 	dma->substream = substream;
165 	dma->period_bytes = period_bytes;
166 	dma->periods = periods;
167 	spin_lock_irq(&cs5535au->reg_lock);
168 	dma->ops->disable_dma(cs5535au);
169 	dma->ops->setup_prd(cs5535au, jmpprd_addr);
170 	spin_unlock_irq(&cs5535au->reg_lock);
171 	return 0;
172 }
173 
174 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
175 {
176 	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
177 }
178 
179 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
180 {
181 	cs_writeb(cs5535au, ACC_BM0_CMD, 0);
182 }
183 
184 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
185 {
186 	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
187 }
188 
189 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
190 					   u32 prd_addr)
191 {
192 	cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
193 }
194 
195 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
196 {
197 	return cs_readl(cs5535au, ACC_BM0_PRD);
198 }
199 
200 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
201 {
202 	return cs_readl(cs5535au, ACC_BM0_PNTR);
203 }
204 
205 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
206 {
207 	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
208 }
209 
210 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
211 {
212 	cs_writeb(cs5535au, ACC_BM1_CMD, 0);
213 }
214 
215 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
216 {
217 	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
218 }
219 
220 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
221 					  u32 prd_addr)
222 {
223 	cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
224 }
225 
226 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
227 {
228 	return cs_readl(cs5535au, ACC_BM1_PRD);
229 }
230 
231 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
232 {
233 	return cs_readl(cs5535au, ACC_BM1_PNTR);
234 }
235 
236 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
237 					  struct cs5535audio_dma *dma,
238 					  struct snd_pcm_substream *substream)
239 {
240 	snd_dma_free_pages(&dma->desc_buf);
241 	dma->desc_buf.area = NULL;
242 	dma->substream = NULL;
243 }
244 
245 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
246 				     struct snd_pcm_hw_params *hw_params)
247 {
248 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
249 	struct cs5535audio_dma *dma = substream->runtime->private_data;
250 	int err;
251 
252 	err = snd_pcm_lib_malloc_pages(substream,
253 					params_buffer_bytes(hw_params));
254 	if (err < 0)
255 		return err;
256 	dma->buf_addr = substream->runtime->dma_addr;
257 	dma->buf_bytes = params_buffer_bytes(hw_params);
258 
259 	err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
260 					    params_periods(hw_params),
261 					    params_period_bytes(hw_params));
262 	if (!err)
263 		dma->pcm_open_flag = 1;
264 
265 	return err;
266 }
267 
268 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
269 {
270 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
271 	struct cs5535audio_dma *dma = substream->runtime->private_data;
272 
273 	if (dma->pcm_open_flag) {
274 		if (substream == cs5535au->playback_substream)
275 			snd_ac97_update_power(cs5535au->ac97,
276 					AC97_PCM_FRONT_DAC_RATE, 0);
277 		else
278 			snd_ac97_update_power(cs5535au->ac97,
279 					AC97_PCM_LR_ADC_RATE, 0);
280 		dma->pcm_open_flag = 0;
281 	}
282 	cs5535audio_clear_dma_packets(cs5535au, dma, substream);
283 	return snd_pcm_lib_free_pages(substream);
284 }
285 
286 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
287 {
288 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
289 	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
290 				 substream->runtime->rate);
291 }
292 
293 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
294 {
295 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
296 	struct cs5535audio_dma *dma = substream->runtime->private_data;
297 	int err = 0;
298 
299 	spin_lock(&cs5535au->reg_lock);
300 	switch (cmd) {
301 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
302 		dma->ops->pause_dma(cs5535au);
303 		break;
304 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
305 		dma->ops->enable_dma(cs5535au);
306 		break;
307 	case SNDRV_PCM_TRIGGER_START:
308 		dma->ops->enable_dma(cs5535au);
309 		break;
310 	case SNDRV_PCM_TRIGGER_RESUME:
311 		dma->ops->enable_dma(cs5535au);
312 		break;
313 	case SNDRV_PCM_TRIGGER_STOP:
314 		dma->ops->disable_dma(cs5535au);
315 		break;
316 	case SNDRV_PCM_TRIGGER_SUSPEND:
317 		dma->ops->disable_dma(cs5535au);
318 		break;
319 	default:
320 		dev_err(cs5535au->card->dev, "unhandled trigger\n");
321 		err = -EINVAL;
322 		break;
323 	}
324 	spin_unlock(&cs5535au->reg_lock);
325 	return err;
326 }
327 
328 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
329 							*substream)
330 {
331 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
332 	u32 curdma;
333 	struct cs5535audio_dma *dma;
334 
335 	dma = substream->runtime->private_data;
336 	curdma = dma->ops->read_dma_pntr(cs5535au);
337 	if (curdma < dma->buf_addr) {
338 		dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
339 					curdma, dma->buf_addr);
340 		return 0;
341 	}
342 	curdma -= dma->buf_addr;
343 	if (curdma >= dma->buf_bytes) {
344 		dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
345 					curdma, dma->buf_bytes);
346 		return 0;
347 	}
348 	return bytes_to_frames(substream->runtime, curdma);
349 }
350 
351 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
352 {
353 	int err;
354 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
355 	struct snd_pcm_runtime *runtime = substream->runtime;
356 
357 	runtime->hw = snd_cs5535audio_capture;
358 	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
359 	snd_pcm_limit_hw_rates(runtime);
360 	cs5535au->capture_substream = substream;
361 	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
362 	if ((err = snd_pcm_hw_constraint_integer(runtime,
363 					 SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
364 		return err;
365 	olpc_capture_open(cs5535au->ac97);
366 	return 0;
367 }
368 
369 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
370 {
371 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
372 	olpc_capture_close(cs5535au->ac97);
373 	return 0;
374 }
375 
376 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
377 {
378 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
379 	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
380 				 substream->runtime->rate);
381 }
382 
383 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
384 	.open =		snd_cs5535audio_playback_open,
385 	.close =	snd_cs5535audio_playback_close,
386 	.ioctl =	snd_pcm_lib_ioctl,
387 	.hw_params =	snd_cs5535audio_hw_params,
388 	.hw_free =	snd_cs5535audio_hw_free,
389 	.prepare =	snd_cs5535audio_playback_prepare,
390 	.trigger =	snd_cs5535audio_trigger,
391 	.pointer =	snd_cs5535audio_pcm_pointer,
392 };
393 
394 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
395 	.open =		snd_cs5535audio_capture_open,
396 	.close =	snd_cs5535audio_capture_close,
397 	.ioctl =	snd_pcm_lib_ioctl,
398 	.hw_params =	snd_cs5535audio_hw_params,
399 	.hw_free =	snd_cs5535audio_hw_free,
400 	.prepare =	snd_cs5535audio_capture_prepare,
401 	.trigger =	snd_cs5535audio_trigger,
402 	.pointer =	snd_cs5535audio_pcm_pointer,
403 };
404 
405 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
406         .type = CS5535AUDIO_DMA_PLAYBACK,
407         .enable_dma = cs5535audio_playback_enable_dma,
408         .disable_dma = cs5535audio_playback_disable_dma,
409         .setup_prd = cs5535audio_playback_setup_prd,
410         .read_prd = cs5535audio_playback_read_prd,
411         .pause_dma = cs5535audio_playback_pause_dma,
412         .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
413 };
414 
415 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
416         .type = CS5535AUDIO_DMA_CAPTURE,
417         .enable_dma = cs5535audio_capture_enable_dma,
418         .disable_dma = cs5535audio_capture_disable_dma,
419         .setup_prd = cs5535audio_capture_setup_prd,
420         .read_prd = cs5535audio_capture_read_prd,
421         .pause_dma = cs5535audio_capture_pause_dma,
422         .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
423 };
424 
425 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
426 {
427 	struct snd_pcm *pcm;
428 	int err;
429 
430 	err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
431 	if (err < 0)
432 		return err;
433 
434 	cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
435 					&snd_cs5535audio_playback_dma_ops;
436 	cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
437 					&snd_cs5535audio_capture_dma_ops;
438 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
439 					&snd_cs5535audio_playback_ops);
440 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
441 					&snd_cs5535audio_capture_ops);
442 
443 	pcm->private_data = cs5535au;
444 	pcm->info_flags = 0;
445 	strcpy(pcm->name, "CS5535 Audio");
446 
447 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
448 					snd_dma_pci_data(cs5535au->pci),
449 					64*1024, 128*1024);
450 	cs5535au->pcm = pcm;
451 
452 	return 0;
453 }
454 
455