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