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/*
* kirkwood-dma.c
*
* (c) 2010 Arnaud Patard <apatard@mandriva.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#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"
#define KIRKWOOD_RATES \
(SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
#define KIRKWOOD_FORMATS \
(SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
struct kirkwood_dma_priv {
struct snd_pcm_substream *play_stream;
struct snd_pcm_substream *rec_stream;
struct kirkwood_dma_data *data;
};
static 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),
.formats = KIRKWOOD_FORMATS,
.rates = KIRKWOOD_RATES,
.rate_min = 44100,
.rate_max = 96000,
.channels_min = 1,
.channels_max = 2,
.buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
.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 u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL;
static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
{
struct kirkwood_dma_priv *prdata = dev_id;
struct kirkwood_dma_data *priv = prdata->data;
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);
return IRQ_HANDLED;
}
/* 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(prdata->play_stream);
if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
snd_pcm_period_elapsed(prdata->rec_stream);
return IRQ_HANDLED;
}
static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
unsigned long dma,
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++) {
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_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct snd_soc_platform *platform = soc_runtime->platform;
struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
struct kirkwood_dma_data *priv;
struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
unsigned long addr;
priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
/* Ensure that all constraints linked to dma burst are fullfilled */
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 (prdata == NULL) {
prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
if (prdata == NULL)
return -ENOMEM;
prdata->data = priv;
err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
"kirkwood-i2s", prdata);
if (err) {
kfree(prdata);
return -EBUSY;
}
snd_soc_platform_set_drvdata(platform, prdata);
/*
* Enable Error interrupts. We're only ack'ing them but
* it's usefull for diagnostics
*/
writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
}
addr = virt_to_phys(substream->dma_buffer.area);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
prdata->play_stream = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
} else {
prdata->rec_stream = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_RECORD_WIN, addr, priv->dram);
}
return 0;
}
static int kirkwood_dma_close(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
struct snd_soc_platform *platform = soc_runtime->platform;
struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
struct kirkwood_dma_data *priv;
priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
if (!prdata || !priv)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prdata->play_stream = NULL;
else
prdata->rec_stream = NULL;
if (!prdata->play_stream && !prdata->rec_stream) {
writel(0, priv->io + KIRKWOOD_ERR_MASK);
free_irq(priv->irq, prdata);
kfree(prdata);
snd_soc_platform_set_drvdata(platform, NULL);
}
return 0;
}
static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = params_buffer_bytes(params);
return 0;
}
static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
struct kirkwood_dma_data *priv;
unsigned long size, count;
priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
/* compute buffer size in term of "words" as requested in specs */
size = frames_to_bytes(runtime, runtime<
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