// SPDX-License-Identifier: GPL-2.0-or-later
/*
* kirkwood-dma.c
*
* (c) 2010 Arnaud Patard <[email protected]>
* (c) 2010 Arnaud Patard <[email protected]>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/mbus.h>
#include <sound/soc.h>
#include "kirkwood.h"
static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
{
struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(subs);
return snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(soc_runtime, 0));
}
static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
.buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
.period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
.period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
.periods_min = KIRKWOOD_SND_MIN_PERIODS,
.periods_max = KIRKWOOD_SND_MAX_PERIODS,
.fifo_size = 0,
};
static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
{
struct kirkwood_dma_data *priv = dev_id;
unsigned long mask, status, cause;
mask = readl(priv->io + KIRKWOOD_INT_MASK);
status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
if (unlikely(cause)) {
printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
__func__, cause);
writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
}
/* we've enabled only bytes interrupts ... */
if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
KIRKWOOD_INT_CAUSE_REC_BYTES)) {
printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
__func__, status);
return IRQ_NONE;
}
/* ack int */
writel(status, priv->io + KIRKWOOD_INT_CAUSE);
if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
snd_pcm_period_elapsed(priv->substream_play);
if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
snd_pcm_period_elapsed(priv->substream_rec);
return IRQ_HANDLED;
}
static void
kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
unsigned long dma,
const struct mbus_dram_target_info *dram)
{
int i;
/* First disable and clear windows */
writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
/* try to find matching cs for current dma address */
for (i = 0; i < dram->num_cs; i++) {
const struct mbus_dram_window *cs = &dram->cs[i];
if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
writel(cs->base & 0xffff0000,
base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
writel(((cs->size - 1) & 0xffff0000) |
(cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) | 1,
base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
}
}
}
static int kirkwood_dma_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
struct kirkwood_dma_data *priv = kirkwood_priv(substream);
snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
/* Ensure that all constraints linked to dma burst are fulfilled */
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
priv->burst * 2,
KIRKWOOD_AUDIO_BUF_MAX-1);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
priv->burst);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
priv->burst);
if (err < 0)
return err;
if (!priv->substream_play && !priv->substream_rec) {
err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
"kirkwood-i2s", priv);
if (err)
return err;
/*
* Enable Error interrupts. We're only ack'ing them but
* it's useful for diagnostics
*/
writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (priv->substream_play)
return -EBUSY;
priv->substream_play = substream;
} else {
if (priv->substream_rec)
return -EBUSY;
priv->substream_rec = substream;
}
return 0;
}
static int kirkwood_dma_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct kirkwood_dma_data *priv = kirkwood_priv(substream);
if (!priv)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
priv->substream_play = NULL;
else
priv->substream_rec = NULL;
if (!priv->substream_play && !priv->substream_rec) {
writel(0, priv->io + KIRKWOOD_ERR_MASK);
free_irq(priv->irq, priv);
}
return 0;
}
static int kirkwood_dma_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct kirkwood_dma_data *priv = kirkwood_priv(substream);
const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
unsigned long addr = substream->runtime->dma_addr;
if (!dram)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_PLAYBACK_WIN, addr, dram);
else
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_RECORD_WIN, addr, dram);
return 0;
}
static int kirkwood_dma_prepare(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct kirkwood_dma_data *priv = kirkwood_priv(substream);
unsigned long size, count;
/* compute buffer size in term of "words" as requested in specs */
size = frames_to_bytes(runtime, runtime->buffer_size);
size = (size>>2)-1;
count = snd_pcm_lib_period_bytes(substream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
} else {
writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
}
return 0;
}
static snd_pcm_uframes_t kirkwood_dma_pointer(
struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct kirkwood_dma_data *priv = kirkwood_priv(substream);
snd_pcm_uframes_t count;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
count = bytes_to_frames(substream->runtime,
readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
else
count = bytes_to_frames(substream->runtime,
readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
return count;
}
static int kirkwood_dma_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
struct snd_card *card = rtd->card->snd_card;
int ret;
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
card->dev, size, size);
return 0;
}
const struct snd_soc_component_driver kirkwood_soc_component = {
.name = DRV_NAME,
.open = kirkwood_dma_open,
.close = kirkwood_dma_close,
.hw_params = kirkwood_dma_hw_params,
.prepare = kirkwood_dma_prepare,
.pointer = kirkwood_dma_pointer,
.pcm_construct = kirkwood_dma_new,
};
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