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OpenCloudOS-Kernel/drivers/media/pci/tw686x/tw686x-audio.c

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/*
* Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar
*
* Based on the audio support from the tw6869 driver:
* Copyright 2015 www.starterkit.ru <info@starterkit.ru>
*
* Based on:
* Driver for Intersil|Techwell TW6869 based DVR cards
* (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China]
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include "tw686x.h"
#include "tw686x-regs.h"
#define AUDIO_CHANNEL_OFFSET 8
void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
unsigned int pb_status)
{
unsigned long flags;
unsigned int ch, pb;
for_each_set_bit(ch, &requests, max_channels(dev)) {
struct tw686x_audio_channel *ac = &dev->audio_channels[ch];
struct tw686x_audio_buf *done = NULL;
struct tw686x_audio_buf *next = NULL;
struct tw686x_dma_desc *desc;
pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch));
spin_lock_irqsave(&ac->lock, flags);
/* Sanity check */
if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) {
spin_unlock_irqrestore(&ac->lock, flags);
continue;
}
if (!list_empty(&ac->buf_list)) {
next = list_first_entry(&ac->buf_list,
struct tw686x_audio_buf, list);
list_move_tail(&next->list, &ac->buf_list);
done = ac->curr_bufs[!pb];
ac->curr_bufs[pb] = next;
}
spin_unlock_irqrestore(&ac->lock, flags);
desc = &ac->dma_descs[pb];
if (done && next && desc->virt) {
memcpy(done->virt, desc->virt, desc->size);
ac->ptr = done->dma - ac->buf[0].dma;
snd_pcm_period_elapsed(ac->ss);
}
}
}
static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
}
static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss)
{
return snd_pcm_lib_free_pages(ss);
}
/*
* The audio device rate is global and shared among all
* capture channels. The driver makes no effort to prevent
* rate modifications. User is free change the rate, but it
* means changing the rate for all capture sub-devices.
*/
static const struct snd_pcm_hardware tw686x_capture_hw = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_8000_48000,
.rate_min = 8000,
.rate_max = 48000,
.channels_min = 1,
.channels_max = 1,
.buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ,
.period_bytes_min = TW686X_AUDIO_PAGE_SZ,
.period_bytes_max = TW686X_AUDIO_PAGE_SZ,
.periods_min = TW686X_AUDIO_PERIODS_MIN,
.periods_max = TW686X_AUDIO_PERIODS_MAX,
};
static int tw686x_pcm_open(struct snd_pcm_substream *ss)
{
struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
struct snd_pcm_runtime *rt = ss->runtime;
int err;
ac->ss = ss;
rt->hw = tw686x_capture_hw;
err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
return 0;
}
static int tw686x_pcm_close(struct snd_pcm_substream *ss)
{
struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
ac->ss = NULL;
return 0;
}
static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
{
struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
struct snd_pcm_runtime *rt = ss->runtime;
unsigned int period_size = snd_pcm_lib_period_bytes(ss);
struct tw686x_audio_buf *p_buf, *b_buf;
unsigned long flags;
int i;
spin_lock_irqsave(&dev->lock, flags);
tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
spin_unlock_irqrestore(&dev->lock, flags);
if (dev->audio_rate != rt->rate) {
u32 reg;
dev->audio_rate = rt->rate;
reg = ((125000000 / rt->rate) << 16) +
((125000000 % rt->rate) << 16) / rt->rate;
reg_write(dev, AUDIO_CONTROL2, reg);
}
if (period_size != TW686X_AUDIO_PAGE_SZ ||
rt->periods < TW686X_AUDIO_PERIODS_MIN ||
rt->periods > TW686X_AUDIO_PERIODS_MAX) {
return -EINVAL;
}
spin_lock_irqsave(&ac->lock, flags);
INIT_LIST_HEAD(&ac->buf_list);
for (i = 0; i < rt->periods; i++) {
ac->buf[i].dma = rt->dma_addr + period_size * i;
ac->buf[i].virt = rt->dma_area + period_size * i;
INIT_LIST_HEAD(&ac->buf[i].list);
list_add_tail(&ac->buf[i].list, &ac->buf_list);
}
p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
list_move_tail(&p_buf->list, &ac->buf_list);
b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
list_move_tail(&b_buf->list, &ac->buf_list);
ac->curr_bufs[0] = p_buf;
ac->curr_bufs[1] = b_buf;
ac->ptr = 0;
spin_unlock_irqrestore(&ac->lock, flags);
return 0;
}
static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
{
struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
unsigned long flags;
int err = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (ac->curr_bufs[0] && ac->curr_bufs[1]) {
spin_lock_irqsave(&dev->lock, flags);
tw686x_enable_channel(dev,
AUDIO_CHANNEL_OFFSET + ac->ch);
spin_unlock_irqrestore(&dev->lock, flags);
mod_timer(&dev->dma_delay_timer,
jiffies + msecs_to_jiffies(100));
} else {
err = -EIO;
}
break;
case SNDRV_PCM_TRIGGER_STOP:
spin_lock_irqsave(&dev->lock, flags);
tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
spin_unlock_irqrestore(&dev->lock, flags);
spin_lock_irqsave(&ac->lock, flags);
ac->curr_bufs[0] = NULL;
ac->curr_bufs[1] = NULL;
spin_unlock_irqrestore(&ac->lock, flags);
break;
default:
err = -EINVAL;
}
return err;
}
static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)
{
struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
return bytes_to_frames(ss->runtime, ac->ptr);
}
static struct snd_pcm_ops tw686x_pcm_ops = {
.open = tw686x_pcm_open,
.close = tw686x_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = tw686x_pcm_hw_params,
.hw_free = tw686x_pcm_hw_free,
.prepare = tw686x_pcm_prepare,
.trigger = tw686x_pcm_trigger,
.pointer = tw686x_pcm_pointer,
};
static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
{
struct snd_card *card = dev->snd_card;
struct snd_pcm *pcm;
struct snd_pcm_substream *ss;
unsigned int i;
int err;
err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);
if (err < 0)
return err;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);
snd_pcm_chip(pcm) = dev;
pcm->info_flags = 0;
strlcpy(pcm->name, "tw686x PCM", sizeof(pcm->name));
for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
ss; ss = ss->next, i++)
snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);
return snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(dev->pci_dev),
TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ,
TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ);
}
static void tw686x_audio_dma_free(struct tw686x_dev *dev,
struct tw686x_audio_channel *ac)
{
int pb;
for (pb = 0; pb < 2; pb++) {
if (!ac->dma_descs[pb].virt)
continue;
pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size,
ac->dma_descs[pb].virt,
ac->dma_descs[pb].phys);
ac->dma_descs[pb].virt = NULL;
}
}
static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
struct tw686x_audio_channel *ac)
{
int pb;
for (pb = 0; pb < 2; pb++) {
u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
void *virt;
virt = pci_alloc_consistent(dev->pci_dev, TW686X_AUDIO_PAGE_SZ,
&ac->dma_descs[pb].phys);
if (!virt) {
dev_err(&dev->pci_dev->dev,
"dma%d: unable to allocate audio DMA %s-buffer\n",
ac->ch, pb ? "B" : "P");
return -ENOMEM;
}
ac->dma_descs[pb].virt = virt;
ac->dma_descs[pb].size = TW686X_AUDIO_PAGE_SZ;
reg_write(dev, reg, ac->dma_descs[pb].phys);
}
return 0;
}
void tw686x_audio_free(struct tw686x_dev *dev)
{
unsigned long flags;
u32 dma_ch_mask;
u32 dma_cmd;
spin_lock_irqsave(&dev->lock, flags);
dma_cmd = reg_read(dev, DMA_CMD);
dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);
reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);
reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);
spin_unlock_irqrestore(&dev->lock, flags);
if (!dev->snd_card)
return;
snd_card_free(dev->snd_card);
dev->snd_card = NULL;
}
int tw686x_audio_init(struct tw686x_dev *dev)
{
struct pci_dev *pci_dev = dev->pci_dev;
struct snd_card *card;
int err, ch;
/*
* AUDIO_CONTROL1
* DMA byte length [31:19] = 4096 (i.e. ALSA period)
* External audio enable [0] = enabled
*/
reg_write(dev, AUDIO_CONTROL1, 0x80000001);
err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
SNDRV_DEFAULT_STR1,
THIS_MODULE, 0, &card);
if (err < 0)
return err;
dev->snd_card = card;
strlcpy(card->driver, "tw686x", sizeof(card->driver));
strlcpy(card->shortname, "tw686x", sizeof(card->shortname));
strlcpy(card->longname, pci_name(pci_dev), sizeof(card->longname));
snd_card_set_dev(card, &pci_dev->dev);
for (ch = 0; ch < max_channels(dev); ch++) {
struct tw686x_audio_channel *ac;
ac = &dev->audio_channels[ch];
spin_lock_init(&ac->lock);
ac->dev = dev;
ac->ch = ch;
err = tw686x_audio_dma_alloc(dev, ac);
if (err < 0)
goto err_cleanup;
}
err = tw686x_snd_pcm_init(dev);
if (err < 0)
goto err_cleanup;
err = snd_card_register(card);
if (!err)
return 0;
err_cleanup:
for (ch = 0; ch < max_channels(dev); ch++) {
if (!dev->audio_channels[ch].dev)
continue;
tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);
}
snd_card_free(card);
dev->snd_card = NULL;
return err;
}
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