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
23static 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
52static 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
79static 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
98static 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
106static 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, 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	for (i = 0; i < periods; i++) {
135		struct cs5535audio_dma_desc *desc =
136			&((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
137		desc->addr = cpu_to_le32(addr);
138		desc->size = cpu_to_le16(period_bytes);
139		desc->ctlreserved = cpu_to_le16(PRD_EOP);
140		addr += period_bytes;
141	}
142	/* we reserved one dummy descriptor at the end to do the PRD jump */
143	lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
144	lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
145	lastdesc->size = 0;
146	lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
147	jmpprd_addr = (u32)dma->desc_buf.addr +
148		sizeof(struct cs5535audio_dma_desc) * periods;
149
150	dma->substream = substream;
151	dma->period_bytes = period_bytes;
152	dma->periods = periods;
153	spin_lock_irq(&cs5535au->reg_lock);
154	dma->ops->disable_dma(cs5535au);
155	dma->ops->setup_prd(cs5535au, jmpprd_addr);
156	spin_unlock_irq(&cs5535au->reg_lock);
157	return 0;
158}
159
160static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
161{
162	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
163}
164
165static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
166{
167	cs_writeb(cs5535au, ACC_BM0_CMD, 0);
168}
169
170static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
171{
172	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
173}
174
175static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
176					   u32 prd_addr)
177{
178	cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
179}
180
181static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
182{
183	return cs_readl(cs5535au, ACC_BM0_PRD);
184}
185
186static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
187{
188	return cs_readl(cs5535au, ACC_BM0_PNTR);
189}
190
191static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
192{
193	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
194}
195
196static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
197{
198	cs_writeb(cs5535au, ACC_BM1_CMD, 0);
199}
200
201static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
202{
203	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
204}
205
206static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
207					  u32 prd_addr)
208{
209	cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
210}
211
212static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
213{
214	return cs_readl(cs5535au, ACC_BM1_PRD);
215}
216
217static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
218{
219	return cs_readl(cs5535au, ACC_BM1_PNTR);
220}
221
222static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
223					  struct cs5535audio_dma *dma,
224					  struct snd_pcm_substream *substream)
225{
226	snd_dma_free_pages(&dma->desc_buf);
227	dma->desc_buf.area = NULL;
228	dma->substream = NULL;
229}
230
231static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
232				     struct snd_pcm_hw_params *hw_params)
233{
234	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
235	struct cs5535audio_dma *dma = substream->runtime->private_data;
236	int err;
237
238	dma->buf_addr = substream->runtime->dma_addr;
239	dma->buf_bytes = params_buffer_bytes(hw_params);
240
241	err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
242					    params_periods(hw_params),
243					    params_period_bytes(hw_params));
244	if (!err)
245		dma->pcm_open_flag = 1;
246
247	return err;
248}
249
250static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
251{
252	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
253	struct cs5535audio_dma *dma = substream->runtime->private_data;
254
255	if (dma->pcm_open_flag) {
256		if (substream == cs5535au->playback_substream)
257			snd_ac97_update_power(cs5535au->ac97,
258					AC97_PCM_FRONT_DAC_RATE, 0);
259		else
260			snd_ac97_update_power(cs5535au->ac97,
261					AC97_PCM_LR_ADC_RATE, 0);
262		dma->pcm_open_flag = 0;
263	}
264	cs5535audio_clear_dma_packets(cs5535au, dma, substream);
265	return 0;
266}
267
268static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
269{
270	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
271	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
272				 substream->runtime->rate);
273}
274
275static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
276{
277	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
278	struct cs5535audio_dma *dma = substream->runtime->private_data;
279	int err = 0;
280
281	spin_lock(&cs5535au->reg_lock);
282	switch (cmd) {
283	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
284		dma->ops->pause_dma(cs5535au);
285		break;
286	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
287		dma->ops->enable_dma(cs5535au);
288		break;
289	case SNDRV_PCM_TRIGGER_START:
290		dma->ops->enable_dma(cs5535au);
291		break;
292	case SNDRV_PCM_TRIGGER_RESUME:
293		dma->ops->enable_dma(cs5535au);
294		break;
295	case SNDRV_PCM_TRIGGER_STOP:
296		dma->ops->disable_dma(cs5535au);
297		break;
298	case SNDRV_PCM_TRIGGER_SUSPEND:
299		dma->ops->disable_dma(cs5535au);
300		break;
301	default:
302		dev_err(cs5535au->card->dev, "unhandled trigger\n");
303		err = -EINVAL;
304		break;
305	}
306	spin_unlock(&cs5535au->reg_lock);
307	return err;
308}
309
310static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
311							*substream)
312{
313	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
314	u32 curdma;
315	struct cs5535audio_dma *dma;
316
317	dma = substream->runtime->private_data;
318	curdma = dma->ops->read_dma_pntr(cs5535au);
319	if (curdma < dma->buf_addr) {
320		dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
321					curdma, dma->buf_addr);
322		return 0;
323	}
324	curdma -= dma->buf_addr;
325	if (curdma >= dma->buf_bytes) {
326		dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
327					curdma, dma->buf_bytes);
328		return 0;
329	}
330	return bytes_to_frames(substream->runtime, curdma);
331}
332
333static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
334{
335	int err;
336	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
337	struct snd_pcm_runtime *runtime = substream->runtime;
338
339	runtime->hw = snd_cs5535audio_capture;
340	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
341	snd_pcm_limit_hw_rates(runtime);
342	cs5535au->capture_substream = substream;
343	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
344	err = snd_pcm_hw_constraint_integer(runtime,
345					    SNDRV_PCM_HW_PARAM_PERIODS);
346	if (err < 0)
347		return err;
348	olpc_capture_open(cs5535au->ac97);
349	return 0;
350}
351
352static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
353{
354	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
355	olpc_capture_close(cs5535au->ac97);
356	return 0;
357}
358
359static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
360{
361	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
362	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
363				 substream->runtime->rate);
364}
365
366static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
367	.open =		snd_cs5535audio_playback_open,
368	.close =	snd_cs5535audio_playback_close,
369	.hw_params =	snd_cs5535audio_hw_params,
370	.hw_free =	snd_cs5535audio_hw_free,
371	.prepare =	snd_cs5535audio_playback_prepare,
372	.trigger =	snd_cs5535audio_trigger,
373	.pointer =	snd_cs5535audio_pcm_pointer,
374};
375
376static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
377	.open =		snd_cs5535audio_capture_open,
378	.close =	snd_cs5535audio_capture_close,
379	.hw_params =	snd_cs5535audio_hw_params,
380	.hw_free =	snd_cs5535audio_hw_free,
381	.prepare =	snd_cs5535audio_capture_prepare,
382	.trigger =	snd_cs5535audio_trigger,
383	.pointer =	snd_cs5535audio_pcm_pointer,
384};
385
386static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
387        .type = CS5535AUDIO_DMA_PLAYBACK,
388        .enable_dma = cs5535audio_playback_enable_dma,
389        .disable_dma = cs5535audio_playback_disable_dma,
390        .setup_prd = cs5535audio_playback_setup_prd,
391        .read_prd = cs5535audio_playback_read_prd,
392        .pause_dma = cs5535audio_playback_pause_dma,
393        .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
394};
395
396static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
397        .type = CS5535AUDIO_DMA_CAPTURE,
398        .enable_dma = cs5535audio_capture_enable_dma,
399        .disable_dma = cs5535audio_capture_disable_dma,
400        .setup_prd = cs5535audio_capture_setup_prd,
401        .read_prd = cs5535audio_capture_read_prd,
402        .pause_dma = cs5535audio_capture_pause_dma,
403        .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
404};
405
406int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
407{
408	struct snd_pcm *pcm;
409	int err;
410
411	err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
412	if (err < 0)
413		return err;
414
415	cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
416					&snd_cs5535audio_playback_dma_ops;
417	cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
418					&snd_cs5535audio_capture_dma_ops;
419	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
420					&snd_cs5535audio_playback_ops);
421	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
422					&snd_cs5535audio_capture_ops);
423
424	pcm->private_data = cs5535au;
425	pcm->info_flags = 0;
426	strcpy(pcm->name, "CS5535 Audio");
427
428	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
429				       &cs5535au->pci->dev,
430				       64*1024, 128*1024);
431	cs5535au->pcm = pcm;
432
433	return 0;
434}
435
436