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    SubjectRe: [RFC][PATCH 21/26] alsa: ASoC: Add JZ4740 ASoC support
    From
    Date
    On Wed, 2010-06-02 at 21:12 +0200, Lars-Peter Clausen wrote:
    > This patch adds ASoC support for JZ4740 SoCs I2S module.
    >
    > Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
    > Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
    > Cc: Liam Girdwood <lrg@slimlogic.co.uk>
    > Cc: alsa-devel@alsa-project.org
    > ---
    > sound/soc/Kconfig | 1 +
    > sound/soc/Makefile | 1 +
    > sound/soc/jz4740/Kconfig | 13 +
    > sound/soc/jz4740/Makefile | 9 +
    > sound/soc/jz4740/jz4740-i2s.c | 568 +++++++++++++++++++++++++++++++++++++++++
    > sound/soc/jz4740/jz4740-i2s.h | 18 ++
    > sound/soc/jz4740/jz4740-pcm.c | 350 +++++++++++++++++++++++++
    > sound/soc/jz4740/jz4740-pcm.h | 22 ++
    > 8 files changed, 982 insertions(+), 0 deletions(-)
    > create mode 100644 sound/soc/jz4740/Kconfig
    > create mode 100644 sound/soc/jz4740/Makefile
    > create mode 100644 sound/soc/jz4740/jz4740-i2s.c
    > create mode 100644 sound/soc/jz4740/jz4740-i2s.h
    > create mode 100644 sound/soc/jz4740/jz4740-pcm.c
    > create mode 100644 sound/soc/jz4740/jz4740-pcm.h
    >
    > diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
    > index b1749bc..5a7a724 100644
    > --- a/sound/soc/Kconfig
    > +++ b/sound/soc/Kconfig
    > @@ -36,6 +36,7 @@ source "sound/soc/s3c24xx/Kconfig"
    > source "sound/soc/s6000/Kconfig"
    > source "sound/soc/sh/Kconfig"
    > source "sound/soc/txx9/Kconfig"
    > +source "sound/soc/jz4740/Kconfig"
    >
    > # Supported codecs
    > source "sound/soc/codecs/Kconfig"
    > diff --git a/sound/soc/Makefile b/sound/soc/Makefile
    > index 1470141..fdbe74d 100644
    > --- a/sound/soc/Makefile
    > +++ b/sound/soc/Makefile
    > @@ -14,3 +14,4 @@ obj-$(CONFIG_SND_SOC) += s3c24xx/
    > obj-$(CONFIG_SND_SOC) += s6000/
    > obj-$(CONFIG_SND_SOC) += sh/
    > obj-$(CONFIG_SND_SOC) += txx9/
    > +obj-$(CONFIG_SND_SOC) += jz4740/
    > diff --git a/sound/soc/jz4740/Kconfig b/sound/soc/jz4740/Kconfig
    > new file mode 100644
    > index 0000000..39df949
    > --- /dev/null
    > +++ b/sound/soc/jz4740/Kconfig
    > @@ -0,0 +1,13 @@
    > +config SND_JZ4740_SOC
    > + tristate "SoC Audio for Ingenic JZ4740 SoC"
    > + depends on SOC_JZ4740 && SND_SOC
    > + help
    > + Say Y or M if you want to add support for codecs attached to
    > + the Jz4740 AC97, I2S or SSP interface. You will also need

    Do you have an AC97 or SSP interface ?

    > + to select the audio interfaces to support below.
    > +
    > +config SND_JZ4740_SOC_I2S
    > + depends on SND_JZ4740_SOC
    > + tristate "SoC Audio (I2S protocol) for Ingenic jz4740 chip"
    > + help
    > + Say Y if you want to use I2S protocol and I2S codec on Ingenic Jz4740 QI_LB60 board.
    > diff --git a/sound/soc/jz4740/Makefile b/sound/soc/jz4740/Makefile
    > new file mode 100644
    > index 0000000..1be8d19
    > --- /dev/null
    > +++ b/sound/soc/jz4740/Makefile
    > @@ -0,0 +1,9 @@
    > +#
    > +# Jz4740 Platform Support
    > +#
    > +snd-soc-jz4740-objs := jz4740-pcm.o
    > +snd-soc-jz4740-i2s-objs := jz4740-i2s.o
    > +
    > +obj-$(CONFIG_SND_JZ4740_SOC) += snd-soc-jz4740.o
    > +obj-$(CONFIG_SND_JZ4740_SOC_I2S) += snd-soc-jz4740-i2s.o
    > +
    > diff --git a/sound/soc/jz4740/jz4740-i2s.c b/sound/soc/jz4740/jz4740-i2s.c
    > new file mode 100644
    > index 0000000..2b139fd
    > --- /dev/null
    > +++ b/sound/soc/jz4740/jz4740-i2s.c
    > @@ -0,0 +1,568 @@
    > +/*
    > + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
    > + *
    > + * 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.
    > + *

    Formatting looks broken here.

    > + * You should have received a copy of the GNU General Public License along
    > + * with this program; if not, write to the Free Software Foundation, Inc.,
    > + * 675 Mass Ave, Cambridge, MA 02139, USA.
    > + *
    > + */
    > +
    > +#include <linux/init.h>
    > +#include <linux/io.h>
    > +#include <linux/kernel.h>
    > +#include <linux/module.h>
    > +#include <linux/platform_device.h>
    > +#include <linux/slab.h>
    > +
    > +#include <linux/clk.h>
    > +#include <linux/delay.h>
    > +
    > +#include <linux/dma-mapping.h>
    > +
    > +#include <sound/core.h>
    > +#include <sound/pcm.h>
    > +#include <sound/pcm_params.h>
    > +#include <sound/soc.h>
    > +#include <sound/soc-dapm.h>
    > +#include <sound/initval.h>
    > +
    > +#include "jz4740-i2s.h"
    > +#include "jz4740-pcm.h"
    > +
    > +#define JZ_REG_AIC_CONF 0x00
    > +#define JZ_REG_AIC_CTRL 0x04
    > +#define JZ_REG_AIC_I2S_FMT 0x10
    > +#define JZ_REG_AIC_FIFO_STATUS 0x14
    > +#define JZ_REG_AIC_I2S_STATUS 0x1c
    > +#define JZ_REG_AIC_CLK_DIV 0x30
    > +#define JZ_REG_AIC_FIFO 0x34
    > +
    > +#define JZ_AIC_CONF_FIFO_RX_THRESHOLD_MASK (0xf << 12)
    > +#define JZ_AIC_CONF_FIFO_TX_THRESHOLD_MASK (0xf << 8)
    > +#define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
    > +#define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
    > +#define JZ_AIC_CONF_I2S BIT(4)
    > +#define JZ_AIC_CONF_RESET BIT(3)
    > +#define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
    > +#define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
    > +#define JZ_AIC_CONF_ENABLE BIT(0)
    > +
    > +#define JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 12
    > +#define JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 8
    > +
    > +#define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK (0x7 << 19)
    > +#define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK (0x7 << 16)
    > +#define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
    > +#define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
    > +#define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
    > +#define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
    > +#define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
    > +#define JZ_AIC_CTRL_FLUSH BIT(8)
    > +#define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
    > +#define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
    > +#define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
    > +#define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
    > +#define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
    > +#define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
    > +#define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)
    > +
    > +#define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET 19
    > +#define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET 16
    > +
    > +#define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
    > +#define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
    > +#define JZ_AIC_I2S_FMT_MSB BIT(0)
    > +
    > +#define JZ_AIC_I2S_STATUS_BUSY BIT(2)
    > +
    > +#define JZ_AIC_CLK_DIV_MASK 0xf
    > +
    > +struct jz4740_i2s {
    > + struct resource *mem;
    > + void __iomem *base;
    > + dma_addr_t phys_base;
    > +
    > + struct clk *clk_aic;
    > + struct clk *clk_i2s;
    > +
    > + struct jz4740_pcm_config pcm_config_playback;
    > + struct jz4740_pcm_config pcm_config_capture;
    > +};
    > +
    > +static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
    > + unsigned int reg)
    > +{
    > + return readl(i2s->base + reg);
    > +}
    > +
    > +static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
    > + unsigned int reg, uint32_t value)
    > +{
    > + writel(value, i2s->base + reg);
    > +}
    > +
    > +static inline struct jz4740_i2s *jz4740_dai_to_i2s(struct snd_soc_dai *dai)
    > +{
    > + return dai->private_data;
    > +}
    > +
    > +static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
    > + struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + uint32_t conf, ctrl;
    > +
    > + if (dai->active)
    > + return 0;
    > +
    > +
    > + ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
    > + ctrl |= JZ_AIC_CTRL_FLUSH;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
    > +
    > + clk_enable(i2s->clk_i2s);
    > +
    > + conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
    > + conf |= JZ_AIC_CONF_ENABLE;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > +
    > + return 0;
    > +}
    > +
    > +static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
    > + struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + uint32_t conf;
    > +
    > + if (!dai->active)
    > + return;
    > +
    > + conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
    > + conf &= ~JZ_AIC_CONF_ENABLE;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > +
    > + clk_disable(i2s->clk_i2s);
    > +}
    > +
    > +
    > +static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
    > + struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + bool playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
    > +
    > + uint32_t ctrl;
    > + uint32_t mask;
    > +
    > + if (playback)

    It's best to use (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) here.

    > + mask = JZ_AIC_CTRL_ENABLE_PLAYBACK | JZ_AIC_CTRL_ENABLE_TX_DMA;
    > + else
    > + mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;
    > +
    > + ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
    > +
    > + switch (cmd) {
    > + case SNDRV_PCM_TRIGGER_START:
    > + case SNDRV_PCM_TRIGGER_RESUME:
    > + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
    > + ctrl |= mask;
    > + break;
    > + case SNDRV_PCM_TRIGGER_STOP:
    > + case SNDRV_PCM_TRIGGER_SUSPEND:
    > + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
    > + ctrl &= ~mask;
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
    > +
    > + return 0;
    > +}
    > +
    > +
    > +static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > +

    No new line is required here.

    > + uint32_t format = 0;
    > + uint32_t conf;
    > +
    > + conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
    > +
    > + conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER);
    > +
    > + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    > + case SND_SOC_DAIFMT_CBS_CFS:
    > + conf |= JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER;
    > + format |= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
    > + break;
    > + case SND_SOC_DAIFMT_CBM_CFS:
    > + conf |= JZ_AIC_CONF_SYNC_CLK_MASTER;
    > + break;
    > + case SND_SOC_DAIFMT_CBS_CFM:
    > + conf |= JZ_AIC_CONF_BIT_CLK_MASTER;
    > + break;
    > + case SND_SOC_DAIFMT_CBM_CFM:
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    > + case SND_SOC_DAIFMT_MSB:
    > + format |= JZ_AIC_I2S_FMT_MSB;
    > + break;
    > + case SND_SOC_DAIFMT_I2S:
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
    > + case SND_SOC_DAIFMT_NB_NF:
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
    > + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + bool playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
    > + enum jz4740_dma_width dma_width;
    > + struct jz4740_pcm_config *pcm_config;
    > + unsigned int sample_size;
    > + uint32_t ctrl;
    > +
    > + ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
    > +
    > + switch (params_format(params)) {
    > + case SNDRV_PCM_FORMAT_S8:
    > + sample_size = 0;
    > + dma_width = JZ4740_DMA_WIDTH_8BIT;
    > + break;
    > + case SNDRV_PCM_FORMAT_S16:
    > + sample_size = 1;
    > + dma_width = JZ4740_DMA_WIDTH_16BIT;
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + if (playback) {

    Same here re substream->stream

    > + ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK;
    > + ctrl |= sample_size << JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET;
    > + } else {
    > + ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
    > + ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;
    > + }
    > +
    > + switch (params_channels(params)) {
    > + case 2:
    > + break;
    > + case 1:
    > + if (playback) {
    > + ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO;
    > + break;
    > + }
    > + default: /* Falltrough */
    > + return -EINVAL;
    > + }
    > +
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
    > +
    > + if (playback) {

    ditto
    > + pcm_config = &i2s->pcm_config_playback;
    > + pcm_config->dma_config.dst_width = dma_width;
    > + } else {
    > + pcm_config = &i2s->pcm_config_capture;
    > + pcm_config->dma_config.src_width = dma_width;
    > + }
    > +
    > +
    > + snd_soc_dai_set_dma_data(dai, substream, pcm_config);
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > +
    > + switch (div_id) {
    > + case JZ4740_I2S_BIT_CLK:
    > + if (div & 1 || div > 16)
    > + return -EINVAL;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CLK_DIV, div - 1);
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
    > + unsigned int freq, int dir)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + int ret = 0;
    > + struct clk *parent;
    > +
    > + switch (clk_id) {
    > + case JZ4740_I2S_CLKSRC_EXT:
    > + parent = clk_get(NULL, "ext");
    > + clk_set_parent(i2s->clk_i2s, parent);
    > + break;
    > + case JZ4740_I2S_CLKSRC_PLL:
    > + parent = clk_get(NULL, "pll half");
    > + clk_set_parent(i2s->clk_i2s, parent);
    > + ret = clk_set_rate(i2s->clk_i2s, freq);
    > + break;
    > + default:
    > + return -EINVAL;
    > + }
    > + clk_put(parent);
    > +
    > + return ret;
    > +}
    > +
    > +static int jz4740_i2s_suspend(struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + uint32_t conf;
    > +
    > + if (dai->active) {
    > + conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
    > + conf &= ~JZ_AIC_CONF_ENABLE;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > +
    > + clk_disable(i2s->clk_i2s);
    > + }
    > +
    > + clk_disable(i2s->clk_aic);
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_i2s_resume(struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + uint32_t conf;
    > +
    > + clk_enable(i2s->clk_aic);
    > +
    > + if (dai->active) {
    > + clk_enable(i2s->clk_i2s);
    > +
    > + conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
    > + conf |= JZ_AIC_CONF_ENABLE;
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > +
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_i2s_probe(struct platform_device *pdev, struct snd_soc_dai *dai)
    > +{
    > + struct jz4740_i2s *i2s = jz4740_dai_to_i2s(dai);
    > + uint32_t conf;
    > +
    > + conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
    > + (8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
    > + JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
    > + JZ_AIC_CONF_I2S |
    > + JZ_AIC_CONF_INTERNAL_CODEC;
    > +
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
    > + jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
    > +
    > + return 0;
    > +}
    > +
    > +
    > +static struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
    > + .startup = jz4740_i2s_startup,
    > + .shutdown = jz4740_i2s_shutdown,
    > + .trigger = jz4740_i2s_trigger,
    > + .hw_params = jz4740_i2s_hw_params,
    > + .set_fmt = jz4740_i2s_set_fmt,
    > + .set_clkdiv = jz4740_i2s_set_clkdiv,
    > + .set_sysclk = jz4740_i2s_set_sysclk,
    > +};
    > +
    > +#define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
    > + SNDRV_PCM_FMTBIT_S16_LE)
    > +
    > +struct snd_soc_dai jz4740_i2s_dai = {
    > + .name = "jz4740-i2s",
    > + .probe = jz4740_i2s_probe,
    > + .playback = {
    > + .channels_min = 1,
    > + .channels_max = 2,
    > + .rates = SNDRV_PCM_RATE_8000_48000,
    > + .formats = JZ4740_I2S_FMTS,
    > + },
    > + .capture = {
    > + .channels_min = 2,
    > + .channels_max = 2,
    > + .rates = SNDRV_PCM_RATE_8000_48000,
    > + .formats = JZ4740_I2S_FMTS,
    > + },
    > + .symmetric_rates = 1,
    > + .ops = &jz4740_i2s_dai_ops,
    > + .suspend = jz4740_i2s_suspend,
    > + .resume = jz4740_i2s_resume,
    > +};
    > +EXPORT_SYMBOL_GPL(jz4740_i2s_dai);
    > +
    > +static void __devinit jz4740_i2c_init_pcm_config(struct jz4740_i2s *i2s)
    > +{
    > + struct jz4740_dma_config *dma_config;
    > +
    > + /* Playback */
    > + dma_config = &i2s->pcm_config_playback.dma_config;
    > + dma_config->src_width = JZ4740_DMA_WIDTH_32BIT,
    > + dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
    > + dma_config->request_type = JZ4740_DMA_TYPE_AIC_TRANSMIT;
    > + dma_config->flags = JZ4740_DMA_SRC_AUTOINC;
    > + dma_config->mode = JZ4740_DMA_MODE_SINGLE;
    > + i2s->pcm_config_playback.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
    > +
    > + /* Capture */
    > + dma_config = &i2s->pcm_config_capture.dma_config;
    > + dma_config->dst_width = JZ4740_DMA_WIDTH_32BIT,
    > + dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
    > + dma_config->request_type = JZ4740_DMA_TYPE_AIC_RECEIVE;
    > + dma_config->flags = JZ4740_DMA_DST_AUTOINC;
    > + dma_config->mode = JZ4740_DMA_MODE_SINGLE;
    > + i2s->pcm_config_capture.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
    > +}
    > +
    > +static int __devinit jz4740_i2s_dev_probe(struct platform_device *pdev)
    > +{
    > + struct jz4740_i2s *i2s;
    > + int ret;
    > +
    > + i2s = kzalloc(sizeof(*i2s), GFP_KERNEL);
    > +
    > + if (!i2s)
    > + return -ENOMEM;
    > +
    > + i2s->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    > +

    Why the new lines here

    > + if (!i2s->mem) {
    > + ret = -ENOENT;
    > + goto err_free;
    > + }
    > +
    > + i2s->mem = request_mem_region(i2s->mem->start, resource_size(i2s->mem),
    > + pdev->name);
    > +

    and here

    > + if (!i2s->mem) {
    > + ret = -EBUSY;
    > + goto err_free;
    > + }
    > +
    > + i2s->base = ioremap_nocache(i2s->mem->start, resource_size(i2s->mem));
    > +

    ditto

    > + if (!i2s->base) {
    > + ret = -EBUSY;
    > + goto err_release_mem_region;
    > + }
    > +
    > + i2s->phys_base = i2s->mem->start;
    > +
    > + i2s->clk_aic = clk_get(&pdev->dev, "aic");
    > + if (IS_ERR(i2s->clk_aic)) {
    > + ret = PTR_ERR(i2s->clk_aic);
    > + goto err_iounmap;
    > + }
    > +
    > + i2s->clk_i2s = clk_get(&pdev->dev, "i2s");
    > + if (IS_ERR(i2s->clk_i2s)) {
    > + ret = PTR_ERR(i2s->clk_i2s);
    > + goto err_iounmap;
    > + }
    > +
    > + clk_enable(i2s->clk_aic);
    > +
    > + jz4740_i2c_init_pcm_config(i2s);
    > +
    > + jz4740_i2s_dai.private_data = i2s;
    > + ret = snd_soc_register_dai(&jz4740_i2s_dai);
    > +
    > + platform_set_drvdata(pdev, i2s);
    > +
    > + return 0;
    > +
    > +err_iounmap:
    > + iounmap(i2s->base);
    > +err_release_mem_region:
    > + release_mem_region(i2s->mem->start, resource_size(i2s->mem));
    > +err_free:
    > + kfree(i2s);
    > +
    > + return ret;
    > +}
    > +
    > +static int __devexit jz4740_i2s_dev_remove(struct platform_device *pdev)
    > +{
    > + struct jz4740_i2s *i2s = platform_get_drvdata(pdev);
    > +
    > + snd_soc_unregister_dai(&jz4740_i2s_dai);
    > +
    > + clk_disable(i2s->clk_aic);
    > + clk_put(i2s->clk_i2s);
    > + clk_put(i2s->clk_aic);
    > +
    > + iounmap(i2s->base);
    > + release_mem_region(i2s->mem->start, resource_size(i2s->mem));
    > +
    > + platform_set_drvdata(pdev, NULL);
    > + kfree(i2s);
    > +
    > + return 0;
    > +}
    > +
    > +static struct platform_driver jz4740_i2s_driver = {
    > + .probe = jz4740_i2s_dev_probe,
    > + .remove = __devexit_p(jz4740_i2s_dev_remove),
    > + .driver = {
    > + .name = "jz4740-i2s",
    > + .owner = THIS_MODULE,
    > + },
    > +};
    > +
    > +static int __init jz4740_i2s_init(void)
    > +{
    > + return platform_driver_register(&jz4740_i2s_driver);
    > +}
    > +module_init(jz4740_i2s_init);
    > +
    > +static void __exit jz4740_i2s_exit(void)
    > +{
    > + platform_driver_unregister(&jz4740_i2s_driver);
    > +}
    > +module_exit(jz4740_i2s_exit);
    > +
    > +MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
    > +MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
    > +MODULE_LICENSE("GPL");
    > +MODULE_ALIAS("platform:jz4740-i2s");
    > diff --git a/sound/soc/jz4740/jz4740-i2s.h b/sound/soc/jz4740/jz4740-i2s.h
    > new file mode 100644
    > index 0000000..da22ed8
    > --- /dev/null
    > +++ b/sound/soc/jz4740/jz4740-i2s.h
    > @@ -0,0 +1,18 @@
    > +/*
    > + * 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 _JZ4740_I2S_H
    > +#define _JZ4740_I2S_H
    > +
    > +/* I2S clock source */
    > +#define JZ4740_I2S_CLKSRC_EXT 0
    > +#define JZ4740_I2S_CLKSRC_PLL 1
    > +
    > +#define JZ4740_I2S_BIT_CLK 0
    > +
    > +extern struct snd_soc_dai jz4740_i2s_dai;
    > +
    > +#endif
    > diff --git a/sound/soc/jz4740/jz4740-pcm.c b/sound/soc/jz4740/jz4740-pcm.c
    > new file mode 100644
    > index 0000000..fd1c203
    > --- /dev/null
    > +++ b/sound/soc/jz4740/jz4740-pcm.c
    > @@ -0,0 +1,350 @@
    > +/*
    > + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
    > + *
    > + * 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.
    > + *
    > + * You should have received a copy of the GNU General Public License along
    > + * with this program; if not, write to the Free Software Foundation, Inc.,
    > + * 675 Mass Ave, Cambridge, MA 02139, USA.
    > + *
    > + */
    > +
    > +#include <linux/init.h>
    > +#include <linux/interrupt.h>
    > +#include <linux/kernel.h>
    > +#include <linux/module.h>
    > +#include <linux/slab.h>
    > +
    > +#include <linux/dma-mapping.h>
    > +
    > +#include <sound/core.h>
    > +#include <sound/pcm.h>
    > +#include <sound/pcm_params.h>
    > +#include <sound/soc.h>
    > +
    > +#include <asm/mach-jz4740/dma.h>
    > +#include "jz4740-pcm.h"
    > +
    > +struct jz4740_runtime_data {
    > + unsigned int dma_period;
    > + dma_addr_t dma_start;
    > + dma_addr_t dma_pos;
    > + dma_addr_t dma_end;
    > +
    > + struct jz4740_dma_chan *dma;
    > +
    > + dma_addr_t fifo_addr;
    > +};
    > +
    > +/* identify hardware playback capabilities */
    > +static const struct snd_pcm_hardware jz4740_pcm_hardware = {
    > + .info = SNDRV_PCM_INFO_MMAP |
    > + SNDRV_PCM_INFO_MMAP_VALID |
    > + SNDRV_PCM_INFO_INTERLEAVED |
    > + SNDRV_PCM_INFO_BLOCK_TRANSFER,
    > + .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
    > +
    > + .rates = SNDRV_PCM_RATE_8000_48000,
    > + .channels_min = 1,
    > + .channels_max = 2,
    > + .period_bytes_min = 16,
    > + .period_bytes_max = 2 * PAGE_SIZE,
    > + .periods_min = 2,
    > + .periods_max = 128,
    > + .buffer_bytes_max = 128 * 2 * PAGE_SIZE,
    > + .fifo_size = 32,
    > +};
    > +
    > +static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd, int stream)
    > +{
    > + unsigned int count;
    > +
    > + if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
    > + count = prtd->dma_end - prtd->dma_pos;
    > + else
    > + count = prtd->dma_period;
    > +
    > + jz4740_dma_disable(prtd->dma);
    > +
    > + if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
    > + jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
    > + jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
    > + } else {
    > + jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
    > + jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
    > + }
    > +
    > + jz4740_dma_set_transfer_count(prtd->dma, count);
    > +
    > + jz4740_dma_enable(prtd->dma);
    > +
    > + prtd->dma_pos += prtd->dma_period;
    > + if (prtd->dma_pos >= prtd->dma_end)
    > + prtd->dma_pos = prtd->dma_start;
    > +}
    > +
    > +static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
    > + void *dev_id)
    > +{
    > + struct snd_pcm_substream *substream = dev_id;
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd = runtime->private_data;
    > +
    > + snd_pcm_period_elapsed(substream);
    > +
    > + jz4740_pcm_start_transfer(prtd, substream->stream);
    > +}
    > +
    > +static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
    > + struct snd_pcm_hw_params *params)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd = runtime->private_data;
    > + struct snd_soc_pcm_runtime *rtd = substream->private_data;
    > + struct jz4740_pcm_config *config;
    > +
    > + config = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
    > + if (!prtd->dma) {
    > + const char *dma_channel_name;
    > + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
    > + dma_channel_name = "PCM Playback";
    > + else
    > + dma_channel_name = "PCM Capture";
    > +
    > + prtd->dma = jz4740_dma_request(substream, dma_channel_name);

    dma_channel_name variable is not required here. Just use the const char
    * directly.

    > + }
    > +
    > + if (!prtd->dma)
    > + return -EBUSY;
    > +
    > + jz4740_dma_configure(prtd->dma, &config->dma_config);
    > + prtd->fifo_addr = config->fifo_addr;
    > +
    > + jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
    > +
    > + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
    > + runtime->dma_bytes = params_buffer_bytes(params);
    > +
    > + prtd->dma_period = params_period_bytes(params);
    > + prtd->dma_start = runtime->dma_addr;
    > + prtd->dma_pos = prtd->dma_start;
    > + prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
    > +{
    > + struct jz4740_runtime_data *prtd = substream->runtime->private_data;
    > +
    > + snd_pcm_set_runtime_buffer(substream, NULL);
    > + if (prtd->dma) {
    > + jz4740_dma_free(prtd->dma);
    > + prtd->dma = NULL;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
    > +{
    > + struct jz4740_runtime_data *prtd = substream->runtime->private_data;
    > + int ret = 0;
    > +
    > + if (!prtd->dma)
    > + return 0;
    > +
    > + prtd->dma_pos = prtd->dma_start;
    > +
    > + return ret;
    > +}
    > +
    > +static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd = runtime->private_data;
    > +
    No new line.

    > + int ret = 0;
    > +
    > + switch (cmd) {
    > + case SNDRV_PCM_TRIGGER_START:
    > + case SNDRV_PCM_TRIGGER_RESUME:
    > + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
    > + jz4740_pcm_start_transfer(prtd, substream->stream);
    > + break;
    > + case SNDRV_PCM_TRIGGER_STOP:
    > + case SNDRV_PCM_TRIGGER_SUSPEND:
    > + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
    > + jz4740_dma_disable(prtd->dma);
    > + break;
    > + default:
    > + ret = -EINVAL;
    > + }
    > +
    > + return ret;
    > +}
    > +
    > +static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd = runtime->private_data;
    > + unsigned long count, pos;
    > + snd_pcm_uframes_t offset;
    > + struct jz4740_dma_chan *dma = prtd->dma;
    > +
    > + count = jz4740_dma_get_residue(dma);
    > + if (prtd->dma_pos == prtd->dma_start)
    > + pos = prtd->dma_end - prtd->dma_start - count;
    > + else
    > + pos = prtd->dma_pos - prtd->dma_start - count;
    > +
    > + offset = bytes_to_frames(runtime, pos);
    > + if (offset >= runtime->buffer_size)
    > + offset = 0;
    > +

    Could you comment your calculation a little more.

    > + return offset;
    > +}
    > +
    > +static int jz4740_pcm_open(struct snd_pcm_substream *substream)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd;
    > +
    > + snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
    > + prtd = kzalloc(sizeof(struct jz4740_runtime_data), GFP_KERNEL);
    > +
    > + if (prtd == NULL)
    > + return -ENOMEM;
    > +
    > + runtime->private_data = prtd;
    > + return 0;
    > +}
    > +
    > +static int jz4740_pcm_close(struct snd_pcm_substream *substream)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct jz4740_runtime_data *prtd = runtime->private_data;
    > +
    > + kfree(prtd);
    > +
    > + return 0;
    > +}
    > +
    > +static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
    > + struct vm_area_struct *vma)
    > +{
    > + return remap_pfn_range(vma, vma->vm_start,
    > + substream->dma_buffer.addr >> PAGE_SHIFT,
    > + vma->vm_end - vma->vm_start, vma->vm_page_prot);
    > +}
    > +
    > +static struct snd_pcm_ops jz4740_pcm_ops = {
    > + .open = jz4740_pcm_open,
    > + .close = jz4740_pcm_close,
    > + .ioctl = snd_pcm_lib_ioctl,
    > + .hw_params = jz4740_pcm_hw_params,
    > + .hw_free = jz4740_pcm_hw_free,
    > + .prepare = jz4740_pcm_prepare,
    > + .trigger = jz4740_pcm_trigger,
    > + .pointer = jz4740_pcm_pointer,
    > + .mmap = jz4740_pcm_mmap,
    > +};
    > +
    > +static int jz4740_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
    > +{
    > + struct snd_pcm_substream *substream = pcm->streams[stream].substream;
    > + struct snd_dma_buffer *buf = &substream->dma_buffer;
    > + size_t size = jz4740_pcm_hardware.buffer_bytes_max;
    > +
    > + buf->dev.type = SNDRV_DMA_TYPE_DEV;
    > + buf->dev.dev = pcm->card->dev;
    > + buf->private_data = NULL;
    > +
    > + buf->area = dma_alloc_noncoherent(pcm->card->dev, size,
    > + &buf->addr, GFP_KERNEL);
    > + if (!buf->area)
    > + return -ENOMEM;
    > +
    > + buf->bytes = size;
    > +
    > + return 0;
    > +}
    > +
    > +static void jz4740_pcm_free(struct snd_pcm *pcm)
    > +{
    > + struct snd_pcm_substream *substream;
    > + struct snd_dma_buffer *buf;
    > + int stream;
    > +
    > + for (stream = 0; stream < 2; stream++) {
    > + substream = pcm->streams[stream].substream;
    > + if (!substream)
    > + continue;
    > +
    > + buf = &substream->dma_buffer;
    > + if (!buf->area)
    > + continue;
    > +
    > + dma_free_noncoherent(pcm->card->dev, buf->bytes,
    > + buf->area, buf->addr);
    > + buf->area = NULL;
    > + }
    > +}
    > +
    > +static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
    > +
    > +int jz4740_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
    > + struct snd_pcm *pcm)
    > +{
    > + int ret = 0;
    > +
    > + if (!card->dev->dma_mask)
    > + card->dev->dma_mask = &jz4740_pcm_dmamask;
    > +
    > + if (!card->dev->coherent_dma_mask)
    > + card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
    > +
    > + if (dai->playback.channels_min) {
    > + ret = jz4740_pcm_preallocate_dma_buffer(pcm,
    > + SNDRV_PCM_STREAM_PLAYBACK);
    > + if (ret)
    > + goto err;
    > + }
    > +
    > + if (dai->capture.channels_min) {
    > + ret = jz4740_pcm_preallocate_dma_buffer(pcm,
    > + SNDRV_PCM_STREAM_CAPTURE);
    > + if (ret)
    > + goto err;
    > + }
    > +
    > +err:
    > + return ret;
    > +}
    > +
    > +struct snd_soc_platform jz4740_soc_platform = {
    > + .name = "jz4740-pcm",
    > + .pcm_ops = &jz4740_pcm_ops,
    > + .pcm_new = jz4740_pcm_new,
    > + .pcm_free = jz4740_pcm_free,
    > +};
    > +EXPORT_SYMBOL_GPL(jz4740_soc_platform);
    > +
    > +static int __init jz4740_soc_platform_init(void)
    > +{
    > + return snd_soc_register_platform(&jz4740_soc_platform);
    > +}
    > +module_init(jz4740_soc_platform_init);
    > +
    > +static void __exit jz4740_soc_platform_exit(void)
    > +{
    > + snd_soc_unregister_platform(&jz4740_soc_platform);
    > +}
    > +module_exit(jz4740_soc_platform_exit);
    > +
    > +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
    > +MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
    > +MODULE_LICENSE("GPL");
    > diff --git a/sound/soc/jz4740/jz4740-pcm.h b/sound/soc/jz4740/jz4740-pcm.h
    > new file mode 100644
    > index 0000000..e3f221e
    > --- /dev/null
    > +++ b/sound/soc/jz4740/jz4740-pcm.h
    > @@ -0,0 +1,22 @@
    > +/*
    > + *
    > + * 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 _JZ4740_PCM_H
    > +#define _JZ4740_PCM_H
    > +
    > +#include <linux/dma-mapping.h>
    > +#include <asm/mach-jz4740/dma.h>
    > +
    > +/* platform data */
    > +extern struct snd_soc_platform jz4740_soc_platform;
    > +
    > +struct jz4740_pcm_config {
    > + struct jz4740_dma_config dma_config;
    > + phys_addr_t fifo_addr;
    > +};
    > +
    > +#endif

    Thanks

    Liam
    --
    Freelance Developer, SlimLogic Ltd
    ASoC and Voltage Regulator Maintainer.
    http://www.slimlogic.co.uk



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