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ASoC: Add driver for s6000 I2S interface

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This patch adds a driver for the I2S interface found on Stretch s6000
family processors.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Daniel Glöckner 2009-03-28 19:47:01 +01:00 committed by Mark Brown
parent 103f211d0b
commit 4b166da939
8 changed files with 1204 additions and 0 deletions
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1
sound/soc/Kconfig
View File

@ -32,6 +32,7 @@ source "sound/soc/fsl/Kconfig"
source "sound/soc/omap/Kconfig"
source "sound/soc/pxa/Kconfig"
source "sound/soc/s3c24xx/Kconfig"
source "sound/soc/s6000/Kconfig"
source "sound/soc/sh/Kconfig"
# Supported codecs

1
sound/soc/Makefile
View File

@ -10,4 +10,5 @@ obj-$(CONFIG_SND_SOC) += fsl/
obj-$(CONFIG_SND_SOC) += omap/
obj-$(CONFIG_SND_SOC) += pxa/
obj-$(CONFIG_SND_SOC) += s3c24xx/
obj-$(CONFIG_SND_SOC) += s6000/
obj-$(CONFIG_SND_SOC) += sh/

10
sound/soc/s6000/Kconfig Normal file
View File

@ -0,0 +1,10 @@
config SND_S6000_SOC
tristate "SoC Audio for the Stretch s6000 family"
depends on XTENSA_VARIANT_S6000
help
Say Y or M if you want to add support for codecs attached to
s6000 family chips. You will also need to select the platform
to support below.
config SND_S6000_SOC_I2S
tristate

6
sound/soc/s6000/Makefile Normal file
View File

@ -0,0 +1,6 @@
# s6000 Platform Support
snd-soc-s6000-objs := s6000-pcm.o
snd-soc-s6000-i2s-objs := s6000-i2s.o
obj-$(CONFIG_SND_S6000_SOC) += snd-soc-s6000.o
obj-$(CONFIG_SND_S6000_SOC_I2S) += snd-soc-s6000-i2s.o

629
sound/soc/s6000/s6000-i2s.c Normal file
View File

@ -0,0 +1,629 @@
/*
* ALSA SoC I2S Audio Layer for the Stretch S6000 family
*
* Author: Daniel Gloeckner, <dg@emlix.com>
* Copyright: (C) 2009 emlix GmbH <info@emlix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "s6000-i2s.h"
#include "s6000-pcm.h"
struct s6000_i2s_dev {
dma_addr_t sifbase;
u8 __iomem *scbbase;
unsigned int wide;
unsigned int channel_in;
unsigned int channel_out;
unsigned int lines_in;
unsigned int lines_out;
struct s6000_pcm_dma_params dma_params;
};
#define S6_I2S_INTERRUPT_STATUS 0x00
#define S6_I2S_INT_OVERRUN 1
#define S6_I2S_INT_UNDERRUN 2
#define S6_I2S_INT_ALIGNMENT 4
#define S6_I2S_INTERRUPT_ENABLE 0x04
#define S6_I2S_INTERRUPT_RAW 0x08
#define S6_I2S_INTERRUPT_CLEAR 0x0C
#define S6_I2S_INTERRUPT_SET 0x10
#define S6_I2S_MODE 0x20
#define S6_I2S_DUAL 0
#define S6_I2S_WIDE 1
#define S6_I2S_TX_DEFAULT 0x24
#define S6_I2S_DATA_CFG(c) (0x40 + 0x10 * (c))
#define S6_I2S_IN 0
#define S6_I2S_OUT 1
#define S6_I2S_UNUSED 2
#define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
#define S6_I2S_DIV_MASK 0x001fff
#define S6_I2S_16BIT 0x000000
#define S6_I2S_20BIT 0x002000
#define S6_I2S_24BIT 0x004000
#define S6_I2S_32BIT 0x006000
#define S6_I2S_BITS_MASK 0x006000
#define S6_I2S_MEM_16BIT 0x000000
#define S6_I2S_MEM_32BIT 0x008000
#define S6_I2S_MEM_MASK 0x008000
#define S6_I2S_CHANNELS_SHIFT 16
#define S6_I2S_CHANNELS_MASK 0x030000
#define S6_I2S_SCK_IN 0x000000
#define S6_I2S_SCK_OUT 0x040000
#define S6_I2S_SCK_DIR 0x040000
#define S6_I2S_WS_IN 0x000000
#define S6_I2S_WS_OUT 0x080000
#define S6_I2S_WS_DIR 0x080000
#define S6_I2S_LEFT_FIRST 0x000000
#define S6_I2S_RIGHT_FIRST 0x100000
#define S6_I2S_FIRST 0x100000
#define S6_I2S_CUR_SCK 0x200000
#define S6_I2S_CUR_WS 0x400000
#define S6_I2S_ENABLE(c) (0x48 + 0x10 * (c))
#define S6_I2S_DISABLE_IF 0x02
#define S6_I2S_ENABLE_IF 0x03
#define S6_I2S_IS_BUSY 0x04
#define S6_I2S_DMA_ACTIVE 0x08
#define S6_I2S_IS_ENABLED 0x10
#define S6_I2S_NUM_LINES 4
#define S6_I2S_SIF_PORT0 0x0000000
#define S6_I2S_SIF_PORT1 0x0000080 /* docs say 0x0000010 */
static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
{
writel(val, dev->scbbase + reg);
}
static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
{
return readl(dev->scbbase + reg);
}
static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
u32 mask, u32 val)
{
val ^= s6_i2s_read_reg(dev, reg) & ~mask;
s6_i2s_write_reg(dev, reg, val);
}
static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
{
int i, j, cur, prev;
/*
* Wait for WCLK to toggle 5 times before enabling the channel
* s6000 Family Datasheet 3.6.4:
* "At least two cycles of WS must occur between commands
* to disable or enable the interface"
*/
j = 0;
prev = ~S6_I2S_CUR_WS;
for (i = 1000000; --i && j < 6; ) {
cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
& S6_I2S_CUR_WS;
if (prev != cur) {
prev = cur;
j++;
}
}
if (j < 6)
printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
}
static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
{
s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
}
static void s6000_i2s_start(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
int channel;
channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
dev->channel_out : dev->channel_in;
s6000_i2s_start_channel(dev, channel);
}
static void s6000_i2s_stop(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
int channel;
channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
dev->channel_out : dev->channel_in;
s6000_i2s_stop_channel(dev, channel);
}
static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
int after)
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
s6000_i2s_start(substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (!after)
s6000_i2s_stop(substream);
}
return 0;
}
static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
{
unsigned int pending;
pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
pending &= S6_I2S_INT_ALIGNMENT |
S6_I2S_INT_UNDERRUN |
S6_I2S_INT_OVERRUN;
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
return pending;
}
static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
{
struct s6000_i2s_dev *dev = cpu_dai->private_data;
unsigned int errors;
unsigned int ret;
errors = s6000_i2s_int_sources(dev);
if (likely(!errors))
return 0;
ret = 0;
if (errors & S6_I2S_INT_ALIGNMENT)
printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
if (errors & S6_I2S_INT_UNDERRUN)
ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
if (errors & S6_I2S_INT_OVERRUN)
ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
return ret;
}
static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
{
int channel;
int n = 50;
for (channel = 0; channel < 2; channel++) {
while (--n >= 0) {
int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
if ((v & S6_I2S_IS_ENABLED)
|| !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
break;
udelay(20);
}
}
if (n < 0)
printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
}
static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct s6000_i2s_dev *dev = cpu_dai->private_data;
u32 w;
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
break;
case SND_SOC_DAIFMT_CBS_CFM:
w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
break;
case SND_SOC_DAIFMT_CBM_CFS:
w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
break;
case SND_SOC_DAIFMT_CBS_CFS:
w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_IF:
w |= S6_I2S_LEFT_FIRST;
break;
case SND_SOC_DAIFMT_IB_NF:
w |= S6_I2S_RIGHT_FIRST;
break;
default:
return -EINVAL;
}
s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
return 0;
}
static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
{
struct s6000_i2s_dev *dev = dai->private_data;
if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
return -EINVAL;
s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
S6_I2S_DIV_MASK, div / 2 - 1);
return 0;
}
static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct s6000_i2s_dev *dev = dai->private_data;
int interf;
u32 w = 0;
if (dev->wide)
interf = 0;
else {
w |= (((params_channels(params) - 2) / 2)
<< S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
? dev->channel_out : dev->channel_in;
}
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
break;
case SNDRV_PCM_FORMAT_S32_LE:
w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
break;
default:
printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
params_format(params));
return -EINVAL;
}
if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
& S6_I2S_IS_ENABLED) {
printk(KERN_ERR "s6000-i2s: interface already enabled\n");
return -EBUSY;
}
s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
w);
return 0;
}
static int s6000_i2s_dai_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
struct s6000_i2s_dev *dev = dai->private_data;
struct s6000_snd_platform_data *pdata = pdev->dev.platform_data;
if (!pdata)
return -EINVAL;
dev->wide = pdata->wide;
dev->channel_in = pdata->channel_in;
dev->channel_out = pdata->channel_out;
dev->lines_in = pdata->lines_in;
dev->lines_out = pdata->lines_out;
s6_i2s_write_reg(dev, S6_I2S_MODE,
dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
if (dev->wide) {
int i;
if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
return -EINVAL;
dev->channel_in = 0;
dev->channel_out = 1;
dai->capture.channels_min = 2 * dev->lines_in;
dai->capture.channels_max = dai->capture.channels_min;
dai->playback.channels_min = 2 * dev->lines_out;
dai->playback.channels_max = dai->playback.channels_min;
for (i = 0; i < dev->lines_out; i++)
s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
S6_I2S_UNUSED);
for (; i < S6_I2S_NUM_LINES; i++)
s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
} else {
unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
if (dev->lines_in > 1 || dev->lines_out > 1)
return -EINVAL;
dai->capture.channels_min = 2 * dev->lines_in;
dai->capture.channels_max = 8 * dev->lines_in;
dai->playback.channels_min = 2 * dev->lines_out;
dai->playback.channels_max = 8 * dev->lines_out;
if (dev->lines_in)
cfg[dev->channel_in] = S6_I2S_IN;
if (dev->lines_out)
cfg[dev->channel_out] = S6_I2S_OUT;
s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
}
if (dev->lines_out) {
if (dev->lines_in) {
if (!dev->dma_params.dma_out)
return -ENODEV;
} else {
dev->dma_params.dma_out = dev->dma_params.dma_in;
dev->dma_params.dma_in = 0;
}
}
dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
return 0;
}
#define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
SNDRV_PCM_RATE_8000_192000)
#define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
.set_fmt = s6000_i2s_set_dai_fmt,
.set_clkdiv = s6000_i2s_set_clkdiv,
.hw_params = s6000_i2s_hw_params,
};
struct snd_soc_dai s6000_i2s_dai = {
.name = "s6000-i2s",
.id = 0,
.probe = s6000_i2s_dai_probe,
.playback = {
.channels_min = 2,
.channels_max = 8,
.formats = S6000_I2S_FORMATS,
.rates = S6000_I2S_RATES,
.rate_min = 0,
.rate_max = 1562500,
},
.capture = {
.channels_min = 2,
.channels_max = 8,
.formats = S6000_I2S_FORMATS,
.rates = S6000_I2S_RATES,
.rate_min = 0,
.rate_max = 1562500,
},
.ops = &s6000_i2s_dai_ops,
}
EXPORT_SYMBOL_GPL(s6000_i2s_dai);
static int __devinit s6000_i2s_probe(struct platform_device *pdev)
{
struct s6000_i2s_dev *dev;
struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
u8 __iomem *mmio;
int ret;
scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!scbmem) {
dev_err(&pdev->dev, "no mem resource?\n");
ret = -ENODEV;
goto err_release_none;
}
region = request_mem_region(scbmem->start,
scbmem->end - scbmem->start + 1,
pdev->name);
if (!region) {
dev_err(&pdev->dev, "I2S SCB region already claimed\n");
ret = -EBUSY;
goto err_release_none;
}
mmio = ioremap(scbmem->start, scbmem->end - scbmem->start + 1);
if (!mmio) {
dev_err(&pdev->dev, "can't ioremap SCB region\n");
ret = -ENOMEM;
goto err_release_scb;
}
sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!sifmem) {
dev_err(&pdev->dev, "no second mem resource?\n");
ret = -ENODEV;
goto err_release_map;
}
region = request_mem_region(sifmem->start,
sifmem->end - sifmem->start + 1,
pdev->name);
if (!region) {
dev_err(&pdev->dev, "I2S SIF region already claimed\n");
ret = -EBUSY;
goto err_release_map;
}
dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dma1) {
dev_err(&pdev->dev, "no dma resource?\n");
ret = -ENODEV;
goto err_release_sif;
}
region = request_mem_region(dma1->start, dma1->end - dma1->start + 1,
pdev->name);
if (!region) {
dev_err(&pdev->dev, "I2S DMA region already claimed\n");
ret = -EBUSY;
goto err_release_sif;
}
dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (dma2) {
region = request_mem_region(dma2->start,
dma2->end - dma2->start + 1,
pdev->name);
if (!region) {
dev_err(&pdev->dev,
"I2S DMA region already claimed\n");
ret = -EBUSY;
goto err_release_dma1;
}
}
dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto err_release_dma2;
}
s6000_i2s_dai.dev = &pdev->dev;
s6000_i2s_dai.private_data = dev;
s6000_i2s_dai.dma_data = &dev->dma_params;
dev->sifbase = sifmem->start;
dev->scbbase = mmio;
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
S6_I2S_INT_ALIGNMENT |
S6_I2S_INT_UNDERRUN |
S6_I2S_INT_OVERRUN);
s6000_i2s_stop_channel(dev, 0);
s6000_i2s_stop_channel(dev, 1);
s6000_i2s_wait_disabled(dev);
dev->dma_params.check_xrun = s6000_i2s_check_xrun;
dev->dma_params.trigger = s6000_i2s_trigger;
dev->dma_params.dma_in = dma1->start;
dev->dma_params.dma_out = dma2 ? dma2->start : 0;
dev->dma_params.irq = platform_get_irq(pdev, 0);
if (dev->dma_params.irq < 0) {
dev_err(&pdev->dev, "no irq resource?\n");
ret = -ENODEV;
goto err_release_dev;
}
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
S6_I2S_INT_ALIGNMENT |
S6_I2S_INT_UNDERRUN |
S6_I2S_INT_OVERRUN);
ret = snd_soc_register_dai(&s6000_i2s_dai);
if (ret)
goto err_release_dev;
return 0;
err_release_dev:
kfree(dev);
err_release_dma2:
if (dma2)
release_mem_region(dma2->start, dma2->end - dma2->start + 1);
err_release_dma1:
release_mem_region(dma1->start, dma1->end - dma1->start + 1);
err_release_sif:
release_mem_region(sifmem->start, (sifmem->end - sifmem->start) + 1);
err_release_map:
iounmap(mmio);
err_release_scb:
release_mem_region(scbmem->start, (scbmem->end - scbmem->start) + 1);
err_release_none:
return ret;
}
static void __devexit s6000_i2s_remove(struct platform_device *pdev)
{
struct s6000_i2s_dev *dev = s6000_i2s_dai.private_data;
struct resource *region;
void __iomem *mmio = dev->scbbase;
snd_soc_unregister_dai(&s6000_i2s_dai);
s6000_i2s_stop_channel(dev, 0);
s6000_i2s_stop_channel(dev, 1);
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
s6000_i2s_dai.private_data = 0;
kfree(dev);
region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
release_mem_region(region->start, region->end - region->start + 1);
region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (region)
release_mem_region(region->start,
region->end - region->start + 1);
region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(region->start, (region->end - region->start) + 1);
iounmap(mmio);
region = platform_get_resource(pdev, IORESOURCE_IO, 0);
release_mem_region(region->start, (region->end - region->start) + 1);
}
static struct platform_driver s6000_i2s_driver = {
.probe = s6000_i2s_probe,
.remove = __devexit_p(s6000_i2s_remove),
.driver = {
.name = "s6000-i2s",
.owner = THIS_MODULE,
},
};
static int __init s6000_i2s_init(void)
{
return platform_driver_register(&s6000_i2s_driver);
}
module_init(s6000_i2s_init);
static void __exit s6000_i2s_exit(void)
{
platform_driver_unregister(&s6000_i2s_driver);
}
module_exit(s6000_i2s_exit);
MODULE_AUTHOR("Daniel Gloeckner");
MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
MODULE_LICENSE("GPL");

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/*
* ALSA SoC I2S Audio Layer for the Stretch s6000 family
*
* Author: Daniel Gloeckner, <dg@emlix.com>
* Copyright: (C) 2009 emlix GmbH <info@emlix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _S6000_I2S_H
#define _S6000_I2S_H
extern struct snd_soc_dai s6000_i2s_dai;
struct s6000_snd_platform_data {
int lines_in;
int lines_out;
int channel_in;
int channel_out;
int wide;
int same_rate;
};
#endif

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/*
* ALSA PCM interface for the Stetch s6000 family
*
* Author: Daniel Gloeckner, <dg@emlix.com>
* Copyright: (C) 2009 emlix GmbH <info@emlix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <asm/dma.h>
#include <variant/dmac.h>
#include "s6000-pcm.h"
#define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
#define S6_PCM_PREALLOCATE_MAX (2048 * 1024)
static struct snd_pcm_hardware s6000_pcm_hardware = {
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
.rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
SNDRV_PCM_RATE_8000_192000),
.rate_min = 0,
.rate_max = 1562500,
.channels_min = 2,
.channels_max = 8,
.buffer_bytes_max = 0x7ffffff0,
.period_bytes_min = 16,
.period_bytes_max = 0xfffff0,
.periods_min = 2,
.periods_max = 1024, /* no limit */
.fifo_size = 0,
};
struct s6000_runtime_data {
spinlock_t lock;
int period; /* current DMA period */
};
static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct s6000_runtime_data *prtd = runtime->private_data;
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
int channel;
unsigned int period_size;
unsigned int dma_offset;
dma_addr_t dma_pos;
dma_addr_t src, dst;
period_size = snd_pcm_lib_period_bytes(substream);
dma_offset = prtd->period * period_size;
dma_pos = runtime->dma_addr + dma_offset;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
src = dma_pos;
dst = par->sif_out;
channel = par->dma_out;
} else {
src = par->sif_in;
dst = dma_pos;
channel = par->dma_in;
}
if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
DMA_INDEX_CHNL(channel)))
return;
if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
printk(KERN_ERR "s6000-pcm: fifo full\n");
return;
}
BUG_ON(period_size & 15);
s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
src, dst, period_size);
prtd->period++;
if (unlikely(prtd->period >= runtime->periods))
prtd->period = 0;
}
static irqreturn_t s6000_pcm_irq(int irq, void *data)
{
struct snd_pcm *pcm = data;
struct snd_soc_pcm_runtime *runtime = pcm->private_data;
struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
struct s6000_runtime_data *prtd;
unsigned int has_xrun;
int i, ret = IRQ_NONE;
u32 channel[2] = {
[SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out,
[SNDRV_PCM_STREAM_CAPTURE] = params->dma_in
};
has_xrun = params->check_xrun(runtime->dai->cpu_dai);
for (i = 0; i < ARRAY_SIZE(channel); ++i) {
struct snd_pcm_substream *substream = pcm->streams[i].substream;
unsigned int pending;
if (!channel[i])
continue;
if (unlikely(has_xrun & (1 << i)) &&
substream->runtime &&
snd_pcm_running(substream)) {
dev_dbg(pcm->dev, "xrun\n");
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
ret = IRQ_HANDLED;
}
pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]),
DMA_INDEX_CHNL(channel[i]));
if (pending & 1) {
ret = IRQ_HANDLED;
if (likely(substream->runtime &&
snd_pcm_running(substream))) {
snd_pcm_period_elapsed(substream);
dev_dbg(pcm->dev, "period elapsed %x %x\n",
s6dmac_cur_src(DMA_MASK_DMAC(channel[i]),
DMA_INDEX_CHNL(channel[i])),
s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]),
DMA_INDEX_CHNL(channel[i])));
prtd = substream->runtime->private_data;
spin_lock(&prtd->lock);
s6000_pcm_enqueue_dma(substream);
spin_unlock(&prtd->lock);
}
}
if (unlikely(pending & ~7)) {
if (pending & (1 << 3))
printk(KERN_WARNING
"s6000-pcm: DMA %x Underflow\n",
channel[i]);
if (pending & (1 << 4))
printk(KERN_WARNING
"s6000-pcm: DMA %x Overflow\n",
channel[i]);
if (pending & 0x1e0)
printk(KERN_WARNING
"s6000-pcm: DMA %x Master Error "
"(mask %x)\n",
channel[i], pending >> 5);
}
}
return ret;
}
static int s6000_pcm_start(struct snd_pcm_substream *substream)
{
struct s6000_runtime_data *prtd = substream->runtime->private_data;
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
unsigned long flags;
int srcinc;
u32 dma;
spin_lock_irqsave(&prtd->lock, flags);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
srcinc = 1;
dma = par->dma_out;
} else {
srcinc = 0;
dma = par->dma_in;
}
s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
1 /* priority 1 (0 is max) */,
0 /* peripheral requests w/o xfer length mode */,
srcinc /* source address increment */,
srcinc^1 /* destination address increment */,
0 /* chunksize 0 (skip impossible on this dma) */,
0 /* source skip after chunk (impossible) */,
0 /* destination skip after chunk (impossible) */,
4 /* 16 byte burst size */,
-1 /* don't conserve bandwidth */,
0 /* low watermark irq descriptor theshold */,
0 /* disable hardware timestamps */,
1 /* enable channel */);
s6000_pcm_enqueue_dma(substream);
s6000_pcm_enqueue_dma(substream);
spin_unlock_irqrestore(&prtd->lock, flags);
return 0;
}
static int s6000_pcm_stop(struct snd_pcm_substream *substream)
{
struct s6000_runtime_data *prtd = substream->runtime->private_data;
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
unsigned long flags;
u32 channel;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
channel = par->dma_out;
else
channel = par->dma_in;
s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
DMA_INDEX_CHNL(channel), 0);
spin_lock_irqsave(&prtd->lock, flags);
s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
spin_unlock_irqrestore(&prtd->lock, flags);
return 0;
}
static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
int ret;
ret = par->trigger(substream, cmd, 0);
if (ret < 0)
return ret;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ret = s6000_pcm_start(substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ret = s6000_pcm_stop(substream);
break;
default:
ret = -EINVAL;
}
if (ret < 0)
return ret;
return par->trigger(substream, cmd, 1);
}
static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
{
struct s6000_runtime_data *prtd = substream->runtime->private_data;
prtd->period = 0;
return 0;
}
static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct s6000_runtime_data *prtd = runtime->private_data;
unsigned long flags;
unsigned int offset;
dma_addr_t count;
spin_lock_irqsave(&prtd->lock, flags);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
DMA_INDEX_CHNL(par->dma_out));
else
count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
DMA_INDEX_CHNL(par->dma_in));
count -= runtime->dma_addr;
spin_unlock_irqrestore(&prtd->lock, flags);
offset = bytes_to_frames(runtime, count);
if (unlikely(offset >= runtime->buffer_size))
offset = 0;
return offset;
}
static int s6000_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct s6000_runtime_data *prtd;
int ret;
snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
ret = snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
if (ret < 0)
return ret;
ret = snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
if (ret < 0)
return ret;
ret = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (ret < 0)
return ret;
if (par->same_rate) {
int rate;
spin_lock(&par->lock); /* needed? */
rate = par->rate;
spin_unlock(&par->lock);
if (rate != -1) {
ret = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_RATE,
rate, rate);
if (ret < 0)
return ret;
}
}
prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
if (prtd == NULL)
return -ENOMEM;
spin_lock_init(&prtd->lock);
runtime->private_data = prtd;
return 0;
}
static int s6000_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct s6000_runtime_data *prtd = runtime->private_data;
kfree(prtd);
return 0;
}
static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
int ret;
ret = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (ret < 0) {
printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
return ret;
}
if (par->same_rate) {
spin_lock(&par->lock);
if (par->rate == -1 ||
!(par->in_use & ~(1 << substream->stream))) {
par->rate = params_rate(hw_params);
par->in_use |= 1 << substream->stream;
} else if (params_rate(hw_params) != par->rate) {
snd_pcm_lib_free_pages(substream);
par->in_use &= ~(1 << substream->stream);
ret = -EBUSY;
}
spin_unlock(&par->lock);
}
return ret;
}
static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
spin_lock(&par->lock);
par->in_use &= ~(1 << substream->stream);
if (!par->in_use)
par->rate = -1;
spin_unlock(&par->lock);
return snd_pcm_lib_free_pages(substream);
}
static struct snd_pcm_ops s6000_pcm_ops = {
.open = s6000_pcm_open,
.close = s6000_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = s6000_pcm_hw_params,
.hw_free = s6000_pcm_hw_free,
.trigger = s6000_pcm_trigger,
.prepare = s6000_pcm_prepare,
.pointer = s6000_pcm_pointer,
};
static void s6000_pcm_free(struct snd_pcm *pcm)
{
struct snd_soc_pcm_runtime *runtime = pcm->private_data;
struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
free_irq(params->irq, pcm);
snd_pcm_lib_preallocate_free_for_all(pcm);
}
static u64 s6000_pcm_dmamask = DMA_32BIT_MASK;
static int s6000_pcm_new(struct snd_card *card,
struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
struct snd_soc_pcm_runtime *runtime = pcm->private_data;
struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
int res;
if (!card->dev->dma_mask)
card->dev->dma_mask = &s6000_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_32BIT_MASK;
if (params->dma_in) {
s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
DMA_INDEX_CHNL(params->dma_in));
s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
DMA_INDEX_CHNL(params->dma_in));
}
if (params->dma_out) {
s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
DMA_INDEX_CHNL(params->dma_out));
s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
DMA_INDEX_CHNL(params->dma_out));
}
res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
s6000_soc_platform.name, pcm);
if (res) {
printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
return res;
}
res = snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_DEV,
card->dev,
S6_PCM_PREALLOCATE_SIZE,
S6_PCM_PREALLOCATE_MAX);
if (res)
printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
spin_lock_init(&params->lock);
params->in_use = 0;
params->rate = -1;
return 0;
}
struct snd_soc_platform s6000_soc_platform = {
.name = "s6000-audio",
.pcm_ops = &s6000_pcm_ops,
.pcm_new = s6000_pcm_new,
.pcm_free = s6000_pcm_free,
};
EXPORT_SYMBOL_GPL(s6000_soc_platform);
static int __init s6000_pcm_init(void)
{
return snd_soc_register_platform(&s6000_soc_platform);
}
module_init(s6000_pcm_init);
static void __exit s6000_pcm_exit(void)
{
snd_soc_unregister_platform(&s6000_soc_platform);
}
module_exit(s6000_pcm_exit);
MODULE_AUTHOR("Daniel Gloeckner");
MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
MODULE_LICENSE("GPL");

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/*
* ALSA PCM interface for the Stretch s6000 family
*
* Author: Daniel Gloeckner, <dg@emlix.com>
* Copyright: (C) 2009 emlix GmbH <info@emlix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _S6000_PCM_H
#define _S6000_PCM_H
struct snd_soc_dai;
struct snd_pcm_substream;
struct s6000_pcm_dma_params {
unsigned int (*check_xrun)(struct snd_soc_dai *cpu_dai);
int (*trigger)(struct snd_pcm_substream *substream, int cmd, int after);
dma_addr_t sif_in;
dma_addr_t sif_out;
u32 dma_in;
u32 dma_out;
int irq;
int same_rate;
spinlock_t lock;
int in_use;
int rate;
};
extern struct snd_soc_platform s6000_soc_platform;
#endif