1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar
5 * Based on the audio support from the tw6869 driver:
6 * Copyright 2015 www.starterkit.ru <info@starterkit.ru>
9 * Driver for Intersil|Techwell TW6869 based DVR cards
10 * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China]
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/kmod.h>
18 #include <linux/mutex.h>
19 #include <linux/pci.h>
20 #include <linux/delay.h>
22 #include <sound/core.h>
23 #include <sound/initval.h>
24 #include <sound/pcm.h>
25 #include <sound/control.h>
27 #include "tw686x-regs.h"
29 #define AUDIO_CHANNEL_OFFSET 8
31 void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
32 unsigned int pb_status)
37 for_each_set_bit(ch, &requests, max_channels(dev)) {
38 struct tw686x_audio_channel *ac = &dev->audio_channels[ch];
39 struct tw686x_audio_buf *done = NULL;
40 struct tw686x_audio_buf *next = NULL;
41 struct tw686x_dma_desc *desc;
43 pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch));
45 spin_lock_irqsave(&ac->lock, flags);
48 if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) {
49 spin_unlock_irqrestore(&ac->lock, flags);
53 if (!list_empty(&ac->buf_list)) {
54 next = list_first_entry(&ac->buf_list,
55 struct tw686x_audio_buf, list);
56 list_move_tail(&next->list, &ac->buf_list);
57 done = ac->curr_bufs[!pb];
58 ac->curr_bufs[pb] = next;
60 spin_unlock_irqrestore(&ac->lock, flags);
65 * Checking for a non-nil dma_desc[pb]->virt buffer is
66 * the same as checking for memcpy DMA mode.
68 desc = &ac->dma_descs[pb];
70 memcpy(done->virt, desc->virt,
73 u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
74 reg_write(dev, reg, next->dma);
76 ac->ptr = done->dma - ac->buf[0].dma;
77 snd_pcm_period_elapsed(ac->ss);
81 static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss,
82 struct snd_pcm_hw_params *hw_params)
84 return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
87 static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss)
89 return snd_pcm_lib_free_pages(ss);
93 * Audio parameters are global and shared among all
94 * capture channels. The driver prevents changes to
95 * the parameters if any audio channel is capturing.
97 static const struct snd_pcm_hardware tw686x_capture_hw = {
98 .info = (SNDRV_PCM_INFO_MMAP |
99 SNDRV_PCM_INFO_INTERLEAVED |
100 SNDRV_PCM_INFO_BLOCK_TRANSFER |
101 SNDRV_PCM_INFO_MMAP_VALID),
102 .formats = SNDRV_PCM_FMTBIT_S16_LE,
103 .rates = SNDRV_PCM_RATE_8000_48000,
108 .buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
109 .period_bytes_min = AUDIO_DMA_SIZE_MIN,
110 .period_bytes_max = AUDIO_DMA_SIZE_MAX,
111 .periods_min = TW686X_AUDIO_PERIODS_MIN,
112 .periods_max = TW686X_AUDIO_PERIODS_MAX,
115 static int tw686x_pcm_open(struct snd_pcm_substream *ss)
117 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
118 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
119 struct snd_pcm_runtime *rt = ss->runtime;
123 rt->hw = tw686x_capture_hw;
125 err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
132 static int tw686x_pcm_close(struct snd_pcm_substream *ss)
134 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
135 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
141 static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
143 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
144 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
145 struct snd_pcm_runtime *rt = ss->runtime;
146 unsigned int period_size = snd_pcm_lib_period_bytes(ss);
147 struct tw686x_audio_buf *p_buf, *b_buf;
151 spin_lock_irqsave(&dev->lock, flags);
153 * Given the audio parameters are global (i.e. shared across
154 * DMA channels), we need to check new params are allowed.
156 if (((dev->audio_rate != rt->rate) ||
157 (dev->period_size != period_size)) && dev->audio_enabled)
160 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
161 spin_unlock_irqrestore(&dev->lock, flags);
163 if (dev->audio_rate != rt->rate) {
166 dev->audio_rate = rt->rate;
167 reg = ((125000000 / rt->rate) << 16) +
168 ((125000000 % rt->rate) << 16) / rt->rate;
170 reg_write(dev, AUDIO_CONTROL2, reg);
173 if (dev->period_size != period_size) {
176 dev->period_size = period_size;
177 reg = reg_read(dev, AUDIO_CONTROL1);
178 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
179 reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
181 reg_write(dev, AUDIO_CONTROL1, reg);
184 if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||
185 rt->periods > TW686X_AUDIO_PERIODS_MAX)
188 spin_lock_irqsave(&ac->lock, flags);
189 INIT_LIST_HEAD(&ac->buf_list);
191 for (i = 0; i < rt->periods; i++) {
192 ac->buf[i].dma = rt->dma_addr + period_size * i;
193 ac->buf[i].virt = rt->dma_area + period_size * i;
194 INIT_LIST_HEAD(&ac->buf[i].list);
195 list_add_tail(&ac->buf[i].list, &ac->buf_list);
198 p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
199 list_move_tail(&p_buf->list, &ac->buf_list);
201 b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
202 list_move_tail(&b_buf->list, &ac->buf_list);
204 ac->curr_bufs[0] = p_buf;
205 ac->curr_bufs[1] = b_buf;
208 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
209 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
210 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
213 spin_unlock_irqrestore(&ac->lock, flags);
218 spin_unlock_irqrestore(&dev->lock, flags);
222 static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
224 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
225 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
230 case SNDRV_PCM_TRIGGER_START:
231 if (ac->curr_bufs[0] && ac->curr_bufs[1]) {
232 spin_lock_irqsave(&dev->lock, flags);
233 dev->audio_enabled = 1;
234 tw686x_enable_channel(dev,
235 AUDIO_CHANNEL_OFFSET + ac->ch);
236 spin_unlock_irqrestore(&dev->lock, flags);
238 mod_timer(&dev->dma_delay_timer,
239 jiffies + msecs_to_jiffies(100));
244 case SNDRV_PCM_TRIGGER_STOP:
245 spin_lock_irqsave(&dev->lock, flags);
246 dev->audio_enabled = 0;
247 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
248 spin_unlock_irqrestore(&dev->lock, flags);
250 spin_lock_irqsave(&ac->lock, flags);
251 ac->curr_bufs[0] = NULL;
252 ac->curr_bufs[1] = NULL;
253 spin_unlock_irqrestore(&ac->lock, flags);
261 static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)
263 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
264 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
266 return bytes_to_frames(ss->runtime, ac->ptr);
269 static const struct snd_pcm_ops tw686x_pcm_ops = {
270 .open = tw686x_pcm_open,
271 .close = tw686x_pcm_close,
272 .ioctl = snd_pcm_lib_ioctl,
273 .hw_params = tw686x_pcm_hw_params,
274 .hw_free = tw686x_pcm_hw_free,
275 .prepare = tw686x_pcm_prepare,
276 .trigger = tw686x_pcm_trigger,
277 .pointer = tw686x_pcm_pointer,
280 static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
282 struct snd_card *card = dev->snd_card;
284 struct snd_pcm_substream *ss;
288 err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);
292 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);
293 snd_pcm_chip(pcm) = dev;
295 strscpy(pcm->name, "tw686x PCM", sizeof(pcm->name));
297 for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
298 ss; ss = ss->next, i++)
299 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);
301 snd_pcm_lib_preallocate_pages_for_all(pcm,
303 snd_dma_pci_data(dev->pci_dev),
304 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
305 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
309 static void tw686x_audio_dma_free(struct tw686x_dev *dev,
310 struct tw686x_audio_channel *ac)
314 for (pb = 0; pb < 2; pb++) {
315 if (!ac->dma_descs[pb].virt)
317 pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size,
318 ac->dma_descs[pb].virt,
319 ac->dma_descs[pb].phys);
320 ac->dma_descs[pb].virt = NULL;
324 static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
325 struct tw686x_audio_channel *ac)
330 * In the memcpy DMA mode we allocate a consistent buffer
331 * and use it for the DMA capture. Otherwise, DMA
332 * acts on the ALSA buffers as received in pcm_prepare.
334 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
337 for (pb = 0; pb < 2; pb++) {
338 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
341 virt = pci_alloc_consistent(dev->pci_dev, AUDIO_DMA_SIZE_MAX,
342 &ac->dma_descs[pb].phys);
344 dev_err(&dev->pci_dev->dev,
345 "dma%d: unable to allocate audio DMA %s-buffer\n",
346 ac->ch, pb ? "B" : "P");
349 ac->dma_descs[pb].virt = virt;
350 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;
351 reg_write(dev, reg, ac->dma_descs[pb].phys);
356 void tw686x_audio_free(struct tw686x_dev *dev)
362 spin_lock_irqsave(&dev->lock, flags);
363 dma_cmd = reg_read(dev, DMA_CMD);
364 dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);
365 reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);
366 reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);
367 spin_unlock_irqrestore(&dev->lock, flags);
371 snd_card_free(dev->snd_card);
372 dev->snd_card = NULL;
375 int tw686x_audio_init(struct tw686x_dev *dev)
377 struct pci_dev *pci_dev = dev->pci_dev;
378 struct snd_card *card;
381 /* Enable external audio */
382 reg_write(dev, AUDIO_CONTROL1, BIT(0));
384 err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
386 THIS_MODULE, 0, &card);
390 dev->snd_card = card;
391 strscpy(card->driver, "tw686x", sizeof(card->driver));
392 strscpy(card->shortname, "tw686x", sizeof(card->shortname));
393 strscpy(card->longname, pci_name(pci_dev), sizeof(card->longname));
394 snd_card_set_dev(card, &pci_dev->dev);
396 for (ch = 0; ch < max_channels(dev); ch++) {
397 struct tw686x_audio_channel *ac;
399 ac = &dev->audio_channels[ch];
400 spin_lock_init(&ac->lock);
404 err = tw686x_audio_dma_alloc(dev, ac);
409 err = tw686x_snd_pcm_init(dev);
413 err = snd_card_register(card);
418 for (ch = 0; ch < max_channels(dev); ch++) {
419 if (!dev->audio_channels[ch].dev)
421 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);
424 dev->snd_card = NULL;