- 根目录:
- sound
- soc
- omap
- omap-dmic.c
/*
* omap-dmic.c -- OMAP ASoC DMIC DAI driver
*
* Copyright (C) 2010 - 2011 Texas Instruments
*
* Author: David Lambert <dlambert@ti.com>
* Misael Lopez Cruz <misael.lopez@ti.com>
* Liam Girdwood <lrg@ti.com>
* Peter Ujfalusi <peter.ujfalusi@ti.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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include <sound/omap-pcm.h>
#include "omap-dmic.h"
struct omap_dmic {
struct device *dev;
void __iomem *io_base;
struct clk *fclk;
int fclk_freq;
int out_freq;
int clk_div;
int sysclk;
int threshold;
u32 ch_enabled;
bool active;
struct mutex mutex;
struct snd_dmaengine_dai_dma_data dma_data;
};
static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
{
writel_relaxed(val, dmic->io_base + reg);
}
static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
{
return readl_relaxed(dmic->io_base + reg);
}
static inline void omap_dmic_start(struct omap_dmic *dmic)
{
u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
/* Configure DMA controller */
omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
OMAP_DMIC_DMA_ENABLE);
omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled);
}
static inline void omap_dmic_stop(struct omap_dmic *dmic)
{
u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);
/* Disable DMA request generation */
omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
OMAP_DMIC_DMA_ENABLE);
}
static inline int dmic_is_enabled(struct omap_dmic *dmic)
{
return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
OMAP_DMIC_UP_ENABLE_MASK;
}
static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
int ret = 0;
mutex_lock(&dmic->mutex);
if (!dai->active)
dmic->active = 1;
else
ret = -EBUSY;
mutex_unlock(&dmic->mutex);
return ret;
}
static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
mutex_lock(&dmic->mutex);
if (!dai->active)
dmic->active = 0;
mutex_unlock(&dmic->mutex);
}
static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
{
int divider = -EINVAL;
/*
* 192KHz rate is only supported with 19.2MHz/3.84MHz clock
* configuration.
*/
if (sample_rate == 192000) {
if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
else
dev_err(dmic->dev,
"invalid clock configuration for 192KHz\n");
return divider;
}
switch (dmic->out_freq) {
case 1536000:
if (dmic->fclk_freq != 24576000)
goto div_err;
divider = 0x4; /* Divider: 16 */
break;
case 2400000:
switch (dmic->fclk_freq) {
case 12000000:
divider = 0x5; /* Divider: 5 */
break;
case 19200000:
divider = 0x0; /* Divider: 8 */
break;
case 24000000:
divider = 0x2; /* Divider: 10 */
break;
default:
goto div_err;
}
break;
case 3072000:
if (dmic->fclk_freq != 24576000)
goto div_err;
divider = 0x3; /* Divider: 8 */
break;
case 3840000:
if (dmic->fclk_freq != 19200000)
goto div_err;
divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
break;
default:
dev_err(dmic->dev, "invalid out frequency: %dHz\n",
dmic->out_freq);
break;
}
return divider;
div_err:
dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
dmic->out_freq, dmic->fclk_freq);
return -EINVAL;
}
static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
struct snd_dmaengine_dai_dma_data *dma_data;
int channels;
dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
if (dmic->clk_div < 0) {
dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
dmic->out_freq, dmic->fclk_freq);
return -EINVAL;
}
dmic->ch_enabled = 0;
channels = params_channels(params);
switch (channels) {
case 6:
dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE;
case 4:
dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE;
case 2:
dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE;
break;
default:
dev_err(dmic->dev, "invalid number of legacy channels\n");
return -EINVAL;
}
/* packet size is threshold * channels */
dma_data = snd_soc_dai_get_dma_data(dai, substream);
dma_data->maxburst = dmic->threshold * channels;
return 0;
}
static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
u32 ctrl;
/* Configure uplink threshold */
omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);
ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
/* Set dmic out format */
ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
/* Configure dmic clock divider */
ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div);
omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);
omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
ctrl | OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
return 0;
}
static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
omap_dmic_start(dmic);
break;
case SNDRV_PCM_TRIGGER_STOP:
omap_dmic_stop(dmic);
break;
default:
break;
}
return 0;
}
static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
unsigned int freq)
{
struct clk *parent_clk;
char *parent_clk_name;
int ret = 0;
switch (freq) {
case 12000000:
case 19200000:
case 24000000:
case 24576000:
break;
default:
dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
dmic->fclk_freq = 0;
return -EINVAL;
}
if (dmic->sysclk == clk_id) {
dmic->fclk_freq = freq;
return 0;
}
/* re-parent not allowed if a stream is ongoing */
if (dmic->active && dmic_is_enabled(dmic)) {
dev_err(dmic->dev, "can't re-parent when DMIC active\n");
return -EBUSY;
}
switch (clk_id) {
case OMAP_DMIC_SYSCLK_PAD_CLKS:
parent_clk_name = "pad_clks_ck";
break;
case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
parent_clk_name = "slimbus_clk";
break;
case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
parent_clk_name = "dmic_sync_mux_ck";
break;
default:
dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
return -EINVAL;
}
parent_clk = clk_get(dmic->dev, parent_clk_name);
if (IS_ERR(parent_clk)) {
dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
return -ENODEV;
}
mutex_lock(&dmic->mutex);
if (dmic->active) {
/* disable clock while reparenting */
pm_runtime_put_sync(dmic->dev);
ret = clk_set_parent(dmic->fclk, parent_clk);
pm_runtime_get_sync(dmic->dev);
} else {
ret = clk_set_parent(dmic->fclk, parent_clk);
}
mutex_unlock(&dmic->mutex);
if (ret < 0) {
dev_err(dmic->dev, "re-parent failed\n");
goto err_busy;
}
dmic->sysclk = clk_id;
dmic->fclk_freq = freq;
err_busy:
clk_put(parent_clk);
return ret;
}
static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
unsigned int freq)
{
int ret = 0;
if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
dev_err(dmic->dev, "output clk_id (%d) not supported\n",
clk_id);
return -EINVAL;
}
switch (freq) {
case 1536000:
case 2400000:
case 3072000:
case 3840000:
dmic->out_freq = freq;
break;
default:
dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
dmic->out_freq = 0;
ret = -EINVAL;
}
return ret;
}
static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
if (dir == SND_SOC_CLOCK_IN)
return omap_dmic_select_fclk(dmic, clk_id, freq);
else if (dir == SND_SOC_CLOCK_OUT)
return omap_dmic_select_outclk(dmic, clk_id, freq);
dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
return -EINVAL;
}
static const struct snd_soc_dai_ops omap_dmic_dai_ops = {
.startup = omap_dmic_dai_startup,
.shutdown = omap_dmic_dai_shutdown,
.hw_params = omap_dmic_dai_hw_params,
.prepare = omap_dmic_dai_prepare,
.trigger = omap_dmic_dai_trigger,
.set_sysclk = omap_dmic_set_dai_sysclk,
};
static int omap_dmic_probe(struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
pm_runtime_enable(dmic->dev);
/* Disable lines while request is ongoing */
pm_runtime_get_sync(dmic->dev);
omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
pm_runtime_put_sync(dmic->dev);
/* Configure DMIC threshold value */
dmic->threshold = OMAP_DMIC_THRES_MAX - 3;
snd_soc_dai_init_dma_data(dai, NULL, &dmic->dma_data);
return 0;
}
static int omap_dmic_remove(struct snd_soc_dai *dai)
{
struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
pm_runtime_disable(dmic->dev);
return 0;
}
static struct snd_soc_dai_driver omap_dmic_dai = {
.name = "omap-dmic",
.probe = omap_dmic_probe,
.remove = omap_dmic_remove,
.capture = {
.channels_min = 2,
.channels_max = 6,
.rates = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.sig_bits = 24,
},
.ops = &omap_dmic_dai_ops,
};
static const struct snd_soc_component_driver omap_dmic_component = {
.name = "omap-dmic",
};
static int asoc_dmic_probe(struct platform_device *pdev)
{
struct omap_dmic *dmic;
struct resource *res;
int ret;
dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL);
if (!dmic)
return -ENOMEM;
platform_set_drvdata(pdev, dmic);
dmic->dev = &pdev->dev;
dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;
mutex_init(&dmic->mutex);
dmic->fclk = devm_clk_get(dmic->dev, "fck");
if (IS_ERR(dmic->fclk)) {
dev_err(dmic->dev, "cant get fck\n");
return -ENODEV;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
if (!res) {
dev_err(dmic->dev, "invalid dma memory resource\n");
return -ENODEV;
}
dmic->dma_data.addr = res->start + OMAP_DMIC_DATA_REG;
dmic->dma_data.filter_data = "up_link";
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
dmic->io_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(dmic->io_base))
return PTR_ERR(dmic->io_base);
ret = devm_snd_soc_register_component(&pdev->dev,
&omap_dmic_component,
&omap_dmic_dai, 1);
if (ret)
return ret;
ret = omap_pcm_platform_register(&pdev->dev);
if (ret)
return ret;
return 0;
}
static const struct of_device_id omap_dmic_of_match[] = {
{ .compatible = "ti,omap4-dmic", },
{ }
};
MODULE_DEVICE_TABLE(of, omap_dmic_of_match);
static struct platform_driver asoc_dmic_driver = {
.driver = {
.name = "omap-dmic",
.of_match_table = omap_dmic_of_match,
},
.probe = asoc_dmic_probe,
};
module_platform_driver(asoc_dmic_driver);
MODULE_ALIAS("platform:omap-dmic");
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
MODULE_LICENSE("GPL");