1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for audio on multifunction CS5535 companion device
4  * Copyright (C) Jaya Kumar
5  *
6  * Based on Jaroslav Kysela and Takashi Iwai's examples.
7  * This work was sponsored by CIS(M) Sdn Bhd.
8  *
9  * todo: add be fmt support, spdif, pm
10  */
11 
12 #include <linux/init.h>
13 #include <linux/pci.h>
14 #include <sound/core.h>
15 #include <sound/control.h>
16 #include <sound/initval.h>
17 #include <sound/asoundef.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/ac97_codec.h>
21 #include "cs5535audio.h"
22 
23 static const struct snd_pcm_hardware snd_cs5535audio_playback =
24 {
25 	.info =			(
26 				SNDRV_PCM_INFO_MMAP |
27 				SNDRV_PCM_INFO_INTERLEAVED |
28 		 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
29 		 		SNDRV_PCM_INFO_MMAP_VALID |
30 		 		SNDRV_PCM_INFO_PAUSE |
31 				SNDRV_PCM_INFO_RESUME
32 				),
33 	.formats =		(
34 				SNDRV_PCM_FMTBIT_S16_LE
35 				),
36 	.rates =		(
37 				SNDRV_PCM_RATE_CONTINUOUS |
38 				SNDRV_PCM_RATE_8000_48000
39 				),
40 	.rate_min =		4000,
41 	.rate_max =		48000,
42 	.channels_min =		2,
43 	.channels_max =		2,
44 	.buffer_bytes_max =	(128*1024),
45 	.period_bytes_min =	64,
46 	.period_bytes_max =	(64*1024 - 16),
47 	.periods_min =		1,
48 	.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
49 	.fifo_size =		0,
50 };
51 
52 static const struct snd_pcm_hardware snd_cs5535audio_capture =
53 {
54 	.info =			(
55 				SNDRV_PCM_INFO_MMAP |
56 				SNDRV_PCM_INFO_INTERLEAVED |
57 		 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
58 		 		SNDRV_PCM_INFO_MMAP_VALID
59 				),
60 	.formats =		(
61 				SNDRV_PCM_FMTBIT_S16_LE
62 				),
63 	.rates =		(
64 				SNDRV_PCM_RATE_CONTINUOUS |
65 				SNDRV_PCM_RATE_8000_48000
66 				),
67 	.rate_min =		4000,
68 	.rate_max =		48000,
69 	.channels_min =		2,
70 	.channels_max =		2,
71 	.buffer_bytes_max =	(128*1024),
72 	.period_bytes_min =	64,
73 	.period_bytes_max =	(64*1024 - 16),
74 	.periods_min =		1,
75 	.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
76 	.fifo_size =		0,
77 };
78 
79 static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
80 {
81 	int err;
82 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
83 	struct snd_pcm_runtime *runtime = substream->runtime;
84 
85 	runtime->hw = snd_cs5535audio_playback;
86 	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
87 	snd_pcm_limit_hw_rates(runtime);
88 	cs5535au->playback_substream = substream;
89 	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
90 	err = snd_pcm_hw_constraint_integer(runtime,
91 					    SNDRV_PCM_HW_PARAM_PERIODS);
92 	if (err < 0)
93 		return err;
94 
95 	return 0;
96 }
97 
98 static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
99 {
100 	return 0;
101 }
102 
103 #define CS5535AUDIO_DESC_LIST_SIZE \
104 	PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
105 
106 static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
107 					 struct cs5535audio_dma *dma,
108 					 struct snd_pcm_substream *substream,
109 					 unsigned int periods,
110 					 unsigned int period_bytes)
111 {
112 	unsigned int i;
113 	u32 addr, desc_addr, jmpprd_addr;
114 	struct cs5535audio_dma_desc *lastdesc;
115 
116 	if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
117 		return -ENOMEM;
118 
119 	if (dma->desc_buf.area == NULL) {
120 		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
121 					&cs5535au->pci->dev,
122 					CS5535AUDIO_DESC_LIST_SIZE+1,
123 					&dma->desc_buf) < 0)
124 			return -ENOMEM;
125 		dma->period_bytes = dma->periods = 0;
126 	}
127 
128 	if (dma->periods == periods && dma->period_bytes == period_bytes)
129 		return 0;
130 
131 	/* the u32 cast is okay because in snd*create we successfully told
132 	   pci alloc that we're only 32 bit capable so the upper will be 0 */
133 	addr = (u32) substream->runtime->dma_addr;
134 	desc_addr = (u32) dma->desc_buf.addr;
135 	for (i = 0; i < periods; i++) {
136 		struct cs5535audio_dma_desc *desc =
137 			&((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
138 		desc->addr = cpu_to_le32(addr);
139 		desc->size = cpu_to_le16(period_bytes);
140 		desc->ctlreserved = cpu_to_le16(PRD_EOP);
141 		desc_addr += sizeof(struct cs5535audio_dma_desc);
142 		addr += period_bytes;
143 	}
144 	/* we reserved one dummy descriptor at the end to do the PRD jump */
145 	lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
146 	lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
147 	lastdesc->size = 0;
148 	lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
149 	jmpprd_addr = (u32)dma->desc_buf.addr +
150 		sizeof(struct cs5535audio_dma_desc) * periods;
151 
152 	dma->substream = substream;
153 	dma->period_bytes = period_bytes;
154 	dma->periods = periods;
155 	spin_lock_irq(&cs5535au->reg_lock);
156 	dma->ops->disable_dma(cs5535au);
157 	dma->ops->setup_prd(cs5535au, jmpprd_addr);
158 	spin_unlock_irq(&cs5535au->reg_lock);
159 	return 0;
160 }
161 
162 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
163 {
164 	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
165 }
166 
167 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
168 {
169 	cs_writeb(cs5535au, ACC_BM0_CMD, 0);
170 }
171 
172 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
173 {
174 	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
175 }
176 
177 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
178 					   u32 prd_addr)
179 {
180 	cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
181 }
182 
183 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
184 {
185 	return cs_readl(cs5535au, ACC_BM0_PRD);
186 }
187 
188 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
189 {
190 	return cs_readl(cs5535au, ACC_BM0_PNTR);
191 }
192 
193 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
194 {
195 	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
196 }
197 
198 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
199 {
200 	cs_writeb(cs5535au, ACC_BM1_CMD, 0);
201 }
202 
203 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
204 {
205 	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
206 }
207 
208 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
209 					  u32 prd_addr)
210 {
211 	cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
212 }
213 
214 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
215 {
216 	return cs_readl(cs5535au, ACC_BM1_PRD);
217 }
218 
219 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
220 {
221 	return cs_readl(cs5535au, ACC_BM1_PNTR);
222 }
223 
224 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
225 					  struct cs5535audio_dma *dma,
226 					  struct snd_pcm_substream *substream)
227 {
228 	snd_dma_free_pages(&dma->desc_buf);
229 	dma->desc_buf.area = NULL;
230 	dma->substream = NULL;
231 }
232 
233 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
234 				     struct snd_pcm_hw_params *hw_params)
235 {
236 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
237 	struct cs5535audio_dma *dma = substream->runtime->private_data;
238 	int err;
239 
240 	dma->buf_addr = substream->runtime->dma_addr;
241 	dma->buf_bytes = params_buffer_bytes(hw_params);
242 
243 	err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
244 					    params_periods(hw_params),
245 					    params_period_bytes(hw_params));
246 	if (!err)
247 		dma->pcm_open_flag = 1;
248 
249 	return err;
250 }
251 
252 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
253 {
254 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
255 	struct cs5535audio_dma *dma = substream->runtime->private_data;
256 
257 	if (dma->pcm_open_flag) {
258 		if (substream == cs5535au->playback_substream)
259 			snd_ac97_update_power(cs5535au->ac97,
260 					AC97_PCM_FRONT_DAC_RATE, 0);
261 		else
262 			snd_ac97_update_power(cs5535au->ac97,
263 					AC97_PCM_LR_ADC_RATE, 0);
264 		dma->pcm_open_flag = 0;
265 	}
266 	cs5535audio_clear_dma_packets(cs5535au, dma, substream);
267 	return 0;
268 }
269 
270 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
271 {
272 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
273 	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
274 				 substream->runtime->rate);
275 }
276 
277 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
278 {
279 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
280 	struct cs5535audio_dma *dma = substream->runtime->private_data;
281 	int err = 0;
282 
283 	spin_lock(&cs5535au->reg_lock);
284 	switch (cmd) {
285 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
286 		dma->ops->pause_dma(cs5535au);
287 		break;
288 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
289 		dma->ops->enable_dma(cs5535au);
290 		break;
291 	case SNDRV_PCM_TRIGGER_START:
292 		dma->ops->enable_dma(cs5535au);
293 		break;
294 	case SNDRV_PCM_TRIGGER_RESUME:
295 		dma->ops->enable_dma(cs5535au);
296 		break;
297 	case SNDRV_PCM_TRIGGER_STOP:
298 		dma->ops->disable_dma(cs5535au);
299 		break;
300 	case SNDRV_PCM_TRIGGER_SUSPEND:
301 		dma->ops->disable_dma(cs5535au);
302 		break;
303 	default:
304 		dev_err(cs5535au->card->dev, "unhandled trigger\n");
305 		err = -EINVAL;
306 		break;
307 	}
308 	spin_unlock(&cs5535au->reg_lock);
309 	return err;
310 }
311 
312 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
313 							*substream)
314 {
315 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
316 	u32 curdma;
317 	struct cs5535audio_dma *dma;
318 
319 	dma = substream->runtime->private_data;
320 	curdma = dma->ops->read_dma_pntr(cs5535au);
321 	if (curdma < dma->buf_addr) {
322 		dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
323 					curdma, dma->buf_addr);
324 		return 0;
325 	}
326 	curdma -= dma->buf_addr;
327 	if (curdma >= dma->buf_bytes) {
328 		dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
329 					curdma, dma->buf_bytes);
330 		return 0;
331 	}
332 	return bytes_to_frames(substream->runtime, curdma);
333 }
334 
335 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
336 {
337 	int err;
338 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
339 	struct snd_pcm_runtime *runtime = substream->runtime;
340 
341 	runtime->hw = snd_cs5535audio_capture;
342 	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
343 	snd_pcm_limit_hw_rates(runtime);
344 	cs5535au->capture_substream = substream;
345 	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
346 	err = snd_pcm_hw_constraint_integer(runtime,
347 					    SNDRV_PCM_HW_PARAM_PERIODS);
348 	if (err < 0)
349 		return err;
350 	olpc_capture_open(cs5535au->ac97);
351 	return 0;
352 }
353 
354 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
355 {
356 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
357 	olpc_capture_close(cs5535au->ac97);
358 	return 0;
359 }
360 
361 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
362 {
363 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
364 	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
365 				 substream->runtime->rate);
366 }
367 
368 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
369 	.open =		snd_cs5535audio_playback_open,
370 	.close =	snd_cs5535audio_playback_close,
371 	.hw_params =	snd_cs5535audio_hw_params,
372 	.hw_free =	snd_cs5535audio_hw_free,
373 	.prepare =	snd_cs5535audio_playback_prepare,
374 	.trigger =	snd_cs5535audio_trigger,
375 	.pointer =	snd_cs5535audio_pcm_pointer,
376 };
377 
378 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
379 	.open =		snd_cs5535audio_capture_open,
380 	.close =	snd_cs5535audio_capture_close,
381 	.hw_params =	snd_cs5535audio_hw_params,
382 	.hw_free =	snd_cs5535audio_hw_free,
383 	.prepare =	snd_cs5535audio_capture_prepare,
384 	.trigger =	snd_cs5535audio_trigger,
385 	.pointer =	snd_cs5535audio_pcm_pointer,
386 };
387 
388 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
389         .type = CS5535AUDIO_DMA_PLAYBACK,
390         .enable_dma = cs5535audio_playback_enable_dma,
391         .disable_dma = cs5535audio_playback_disable_dma,
392         .setup_prd = cs5535audio_playback_setup_prd,
393         .read_prd = cs5535audio_playback_read_prd,
394         .pause_dma = cs5535audio_playback_pause_dma,
395         .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
396 };
397 
398 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
399         .type = CS5535AUDIO_DMA_CAPTURE,
400         .enable_dma = cs5535audio_capture_enable_dma,
401         .disable_dma = cs5535audio_capture_disable_dma,
402         .setup_prd = cs5535audio_capture_setup_prd,
403         .read_prd = cs5535audio_capture_read_prd,
404         .pause_dma = cs5535audio_capture_pause_dma,
405         .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
406 };
407 
408 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
409 {
410 	struct snd_pcm *pcm;
411 	int err;
412 
413 	err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
414 	if (err < 0)
415 		return err;
416 
417 	cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
418 					&snd_cs5535audio_playback_dma_ops;
419 	cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
420 					&snd_cs5535audio_capture_dma_ops;
421 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
422 					&snd_cs5535audio_playback_ops);
423 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
424 					&snd_cs5535audio_capture_ops);
425 
426 	pcm->private_data = cs5535au;
427 	pcm->info_flags = 0;
428 	strcpy(pcm->name, "CS5535 Audio");
429 
430 	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
431 				       &cs5535au->pci->dev,
432 				       64*1024, 128*1024);
433 	cs5535au->pcm = pcm;
434 
435 	return 0;
436 }
437 
438