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path: root/drivers/media/pci/tw686x/tw686x-audio.c
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Diffstat (limited to 'drivers/media/pci/tw686x/tw686x-audio.c')
-rw-r--r--drivers/media/pci/tw686x/tw686x-audio.c413
1 files changed, 413 insertions, 0 deletions
diff --git a/drivers/media/pci/tw686x/tw686x-audio.c b/drivers/media/pci/tw686x/tw686x-audio.c
new file mode 100644
index 000000000..74cba1368
--- /dev/null
+++ b/drivers/media/pci/tw686x/tw686x-audio.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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]
+ */
+
+#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);
+
+ if (!done || !next)
+ continue;
+ /*
+ * Checking for a non-nil dma_desc[pb]->virt buffer is
+ * the same as checking for memcpy DMA mode.
+ */
+ desc = &ac->dma_descs[pb];
+ if (desc->virt) {
+ memcpy(done->virt, desc->virt,
+ dev->period_size);
+ } else {
+ u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
+ reg_write(dev, reg, next->dma);
+ }
+ ac->ptr = done->dma - ac->buf[0].dma;
+ snd_pcm_period_elapsed(ac->ss);
+ }
+}
+
+/*
+ * Audio parameters are global and shared among all
+ * capture channels. The driver prevents changes to
+ * the parameters if any audio channel is capturing.
+ */
+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 * AUDIO_DMA_SIZE_MAX,
+ .period_bytes_min = AUDIO_DMA_SIZE_MIN,
+ .period_bytes_max = AUDIO_DMA_SIZE_MAX,
+ .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);
+ /*
+ * Given the audio parameters are global (i.e. shared across
+ * DMA channels), we need to check new params are allowed.
+ */
+ if (((dev->audio_rate != rt->rate) ||
+ (dev->period_size != period_size)) && dev->audio_enabled)
+ goto err_audio_busy;
+
+ 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 (dev->period_size != period_size) {
+ u32 reg;
+
+ dev->period_size = period_size;
+ reg = reg_read(dev, AUDIO_CONTROL1);
+ reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
+ reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
+
+ reg_write(dev, AUDIO_CONTROL1, reg);
+ }
+
+ if (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;
+
+ if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
+ reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
+ reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
+ }
+
+ spin_unlock_irqrestore(&ac->lock, flags);
+
+ return 0;
+
+err_audio_busy:
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -EBUSY;
+}
+
+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);
+ dev->audio_enabled = 1;
+ 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);
+ dev->audio_enabled = 0;
+ 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 const struct snd_pcm_ops tw686x_pcm_ops = {
+ .open = tw686x_pcm_open,
+ .close = tw686x_pcm_close,
+ .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;
+ strscpy(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);
+
+ snd_pcm_set_managed_buffer_all(pcm,
+ SNDRV_DMA_TYPE_DEV,
+ &dev->pci_dev->dev,
+ TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
+ TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
+ return 0;
+}
+
+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;
+ dma_free_coherent(&dev->pci_dev->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;
+
+ /*
+ * In the memcpy DMA mode we allocate a coherent buffer
+ * and use it for the DMA capture. Otherwise, DMA
+ * acts on the ALSA buffers as received in pcm_prepare.
+ */
+ if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
+ return 0;
+
+ for (pb = 0; pb < 2; pb++) {
+ u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
+ void *virt;
+
+ virt = dma_alloc_coherent(&dev->pci_dev->dev,
+ AUDIO_DMA_SIZE_MAX,
+ &ac->dma_descs[pb].phys, GFP_KERNEL);
+ 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 = AUDIO_DMA_SIZE_MAX;
+ 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;
+
+ /* Enable external audio */
+ reg_write(dev, AUDIO_CONTROL1, BIT(0));
+
+ 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;
+ strscpy(card->driver, "tw686x", sizeof(card->driver));
+ strscpy(card->shortname, "tw686x", sizeof(card->shortname));
+ strscpy(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;
+}