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	if ((err = snd_pcm_hw_constraint_integer(runtime,
91				SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
92		return err;
93
94	return 0;
95}
96
97static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
98{
99	return 0;
100}
101
102#define CS5535AUDIO_DESC_LIST_SIZE \
103	PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
104
105static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
106					 struct cs5535audio_dma *dma,
107					 struct snd_pcm_substream *substream,
108					 unsigned int periods,
109					 unsigned int period_bytes)
110{
111	unsigned int i;
112	u32 addr, desc_addr, jmpprd_addr;
113	struct cs5535audio_dma_desc *lastdesc;
114
115	if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
116		return -ENOMEM;
117
118	if (dma->desc_buf.area == NULL) {
119		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
120					&cs5535au->pci->dev,
121					CS5535AUDIO_DESC_LIST_SIZE+1,
122					&dma->desc_buf) < 0)
123			return -ENOMEM;
124		dma->period_bytes = dma->periods = 0;
125	}
126
127	if (dma->periods == periods && dma->period_bytes == period_bytes)
128		return 0;
129
130	/* the u32 cast is okay because in snd*create we successfully told
131   	   pci alloc that we're only 32 bit capable so the uppper will be 0 */
132	addr = (u32) substream->runtime->dma_addr;
133	desc_addr = (u32) dma->desc_buf.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		desc_addr += sizeof(struct cs5535audio_dma_desc);
141		addr += period_bytes;
142	}
143	/* we reserved one dummy descriptor at the end to do the PRD jump */
144	lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
145	lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
146	lastdesc->size = 0;
147	lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
148	jmpprd_addr = (u32)dma->desc_buf.addr +
149		sizeof(struct cs5535audio_dma_desc) * periods;
150
151	dma->substream = substream;
152	dma->period_bytes = period_bytes;
153	dma->periods = periods;
154	spin_lock_irq(&cs5535au->reg_lock);
155	dma->ops->disable_dma(cs5535au);
156	dma->ops->setup_prd(cs5535au, jmpprd_addr);
157	spin_unlock_irq(&cs5535au->reg_lock);
158	return 0;
159}
160
161static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
162{
163	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
164}
165
166static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
167{
168	cs_writeb(cs5535au, ACC_BM0_CMD, 0);
169}
170
171static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
172{
173	cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
174}
175
176static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
177					   u32 prd_addr)
178{
179	cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
180}
181
182static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
183{
184	return cs_readl(cs5535au, ACC_BM0_PRD);
185}
186
187static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
188{
189	return cs_readl(cs5535au, ACC_BM0_PNTR);
190}
191
192static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
193{
194	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
195}
196
197static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
198{
199	cs_writeb(cs5535au, ACC_BM1_CMD, 0);
200}
201
202static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
203{
204	cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
205}
206
207static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
208					  u32 prd_addr)
209{
210	cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
211}
212
213static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
214{
215	return cs_readl(cs5535au, ACC_BM1_PRD);
216}
217
218static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
219{
220	return cs_readl(cs5535au, ACC_BM1_PNTR);
221}
222
223static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
224					  struct cs5535audio_dma *dma,
225					  struct snd_pcm_substream *substream)
226{
227	snd_dma_free_pages(&dma->desc_buf);
228	dma->desc_buf.area = NULL;
229	dma->substream = NULL;
230}
231
232static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
233				     struct snd_pcm_hw_params *hw_params)
234{
235	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
236	struct cs5535audio_dma *dma = substream->runtime->private_data;
237	int err;
238
239	dma->buf_addr = substream->runtime->dma_addr;
240	dma->buf_bytes = params_buffer_bytes(hw_params);
241
242	err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
243					    params_periods(hw_params),
244					    params_period_bytes(hw_params));
245	if (!err)
246		dma->pcm_open_flag = 1;
247
248	return err;
249}
250
251static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
252{
253	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
254	struct cs5535audio_dma *dma = substream->runtime->private_data;
255
256	if (dma->pcm_open_flag) {
257		if (substream == cs5535au->playback_substream)
258			snd_ac97_update_power(cs5535au->ac97,
259					AC97_PCM_FRONT_DAC_RATE, 0);
260		else
261			snd_ac97_update_power(cs5535au->ac97,
262					AC97_PCM_LR_ADC_RATE, 0);
263		dma->pcm_open_flag = 0;
264	}
265	cs5535audio_clear_dma_packets(cs5535au, dma, substream);
266	return 0;
267}
268
269static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
270{
271	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
272	return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
273				 substream->runtime->rate);
274}
275
276static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
277{
278	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
279	struct cs5535audio_dma *dma = substream->runtime->private_data;
280	int err = 0;
281
282	spin_lock(&cs5535au->reg_lock);
283	switch (cmd) {
284	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
285		dma->ops->pause_dma(cs5535au);
286		break;
287	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
288		dma->ops->enable_dma(cs5535au);
289		break;
290	case SNDRV_PCM_TRIGGER_START:
291		dma->ops->enable_dma(cs5535au);
292		break;
293	case SNDRV_PCM_TRIGGER_RESUME:
294		dma->ops->enable_dma(cs5535au);
295		break;
296	case SNDRV_PCM_TRIGGER_STOP:
297		dma->ops->disable_dma(cs5535au);
298		break;
299	case SNDRV_PCM_TRIGGER_SUSPEND:
300		dma->ops->disable_dma(cs5535au);
301		break;
302	default:
303		dev_err(cs5535au->card->dev, "unhandled trigger\n");
304		err = -EINVAL;
305		break;
306	}
307	spin_unlock(&cs5535au->reg_lock);
308	return err;
309}
310
311static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
312							*substream)
313{
314	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
315	u32 curdma;
316	struct cs5535audio_dma *dma;
317
318	dma = substream->runtime->private_data;
319	curdma = dma->ops->read_dma_pntr(cs5535au);
320	if (curdma < dma->buf_addr) {
321		dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
322					curdma, dma->buf_addr);
323		return 0;
324	}
325	curdma -= dma->buf_addr;
326	if (curdma >= dma->buf_bytes) {
327		dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
328					curdma, dma->buf_bytes);
329		return 0;
330	}
331	return bytes_to_frames(substream->runtime, curdma);
332}
333
334static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
335{
336	int err;
337	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
338	struct snd_pcm_runtime *runtime = substream->runtime;
339
340	runtime->hw = snd_cs5535audio_capture;
341	runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
342	snd_pcm_limit_hw_rates(runtime);
343	cs5535au->capture_substream = substream;
344	runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
345	if ((err = snd_pcm_hw_constraint_integer(runtime,
346					 SNDRV_PCM_HW_PARAM_PERIODS)) < 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