- 根目录:
- sound
- soc
- tegra
- tegra_i2s.c
/*
* tegra_i2s.c - Tegra I2S driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2010 - NVIDIA, Inc.
*
* Based on code copyright/by:
*
* Copyright (c) 2009-2010, NVIDIA Corporation.
* Scott Peterson <speterson@nvidia.com>
*
* Copyright (C) 2010 Google, Inc.
* Iliyan Malchev <malchev@google.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/clk.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/iomap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "tegra_das.h"
#include "tegra_i2s.h"
#define DRV_NAME "tegra-i2s"
static inline void tegra_i2s_write(struct tegra_i2s *i2s, u32 reg, u32 val)
{
__raw_writel(val, i2s->regs + reg);
}
static inline u32 tegra_i2s_read(struct tegra_i2s *i2s, u32 reg)
{
return __raw_readl(i2s->regs + reg);
}
#ifdef CONFIG_DEBUG_FS
static int tegra_i2s_show(struct seq_file *s, void *unused)
{
#define REG(r) { r, #r }
static const struct {
int offset;
const char *name;
} regs[] = {
REG(TEGRA_I2S_CTRL),
REG(TEGRA_I2S_STATUS),
REG(TEGRA_I2S_TIMING),
REG(TEGRA_I2S_FIFO_SCR),
REG(TEGRA_I2S_PCM_CTRL),
REG(TEGRA_I2S_NW_CTRL),
REG(TEGRA_I2S_TDM_CTRL),
REG(TEGRA_I2S_TDM_TX_RX_CTRL),
};
#undef REG
struct tegra_i2s *i2s = s->private;
int i;
for (i = 0; i < ARRAY_SIZE(regs); i++) {
u32 val = tegra_i2s_read(i2s, regs[i].offset);
seq_printf(s, "%s = %08x\n", regs[i].name, val);
}
return 0;
}
static int tegra_i2s_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, tegra_i2s_show, inode->i_private);
}
static const struct file_operations tegra_i2s_debug_fops = {
.open = tegra_i2s_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void tegra_i2s_debug_add(struct tegra_i2s *i2s, int id)
{
char name[] = DRV_NAME ".0";
snprintf(name, sizeof(name), DRV_NAME".%1d", id);
i2s->debug = debugfs_create_file(name, S_IRUGO, snd_soc_debugfs_root,
i2s, &tegra_i2s_debug_fops);
}
static void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
{
if (i2s->debug)
debugfs_remove(i2s->debug);
}
#else
static inline void tegra_i2s_debug_add(struct tegra_i2s *i2s, int id)
{
}
static inline void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
{
}
#endif
static int tegra_i2s_set_fmt(struct snd_soc_dai *dai,
unsigned int fmt)
{
struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
default:
return -EINVAL;
}
i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_MASTER_ENABLE;
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_MASTER_ENABLE;
break;
case SND_SOC_DAIFMT_CBM_CFM:
break;
default:
return -EINVAL;
}
i2s->reg_ctrl &= ~(TEGRA_I2S_CTRL_BIT_FORMAT_MASK |
TEGRA_I2S_CTRL_LRCK_MASK);
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_DSP_A:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
break;
case SND_SOC_DAIFMT_DSP_B:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_R_LOW;
break;
case SND_SOC_DAIFMT_I2S:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_I2S;
i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
break;
case SND_SOC_DAIFMT_RIGHT_J:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_RJM;
i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
break;
case SND_SOC_DAIFMT_LEFT_J:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_LJM;
i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
break;
default:
return -EINVAL;
}
return 0;
}
static int tegra_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct device *dev = substream->pcm->card->dev;
struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
u32 reg;
int ret, sample_size, srate, i2sclock, bitcnt;
i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_BIT_SIZE_MASK;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_16;
sample_size = 16;
break;
case SNDRV_PCM_FORMAT_S24_LE:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_24;
sample_size = 24;
break;
case SNDRV_PCM_FORMAT_S32_LE:
i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_32;
sample_size = 32;
break;
default:
return -EINVAL;
}
srate = params_rate(params);
/* Final "* 2" required by Tegra hardware */
i2sclock = srate * params_channels(params) * sample_size * 2;
ret = clk_set_rate(i2s->clk_i2s, i2sclock);
if (ret) {
dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
return ret;
}
bitcnt = (i2sclock / (2 * srate)) - 1;
if (bitcnt < 0 || bitcnt > TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
return -EINVAL;
reg = bitcnt << TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
if (i2sclock % (2 * srate))
reg |= TEGRA_I2S_TIMING_NON_SYM_ENABLE;
if (!i2s->clk_refs)
clk_enable(i2s->clk_i2s);
tegra_i2s_write(i2s, TEGRA_I2S_TIMING, reg);
tegra_i2s_write(i2s, TEGRA_I2S_FIFO_SCR,
TEGRA_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
if (!i2s->clk_refs)
clk_disable(i2s->clk_i2s);
return 0;
}
static void tegra_i2s_start_playback(struct tegra_i2s *i2s)
{
i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO1_ENABLE;
tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
}
static void tegra_i2s_stop_playback(struct tegra_i2s *i2s)
{
i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO1_ENABLE;
tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
}
static void tegra_i2s_start_capture(struct tegra_i2s *i2s)
{
i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO2_ENABLE;
tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
}
static void tegra_i2s_stop_capture(struct tegra_i2s *i2s)
{
i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO2_ENABLE;
tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
}
static int tegra_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
if (!i2s->clk_refs)
clk_enable(i2s->clk_i2s);
i2s->clk_refs++;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
tegra_i2s_start_playback(i2s);
else
tegra_i2s_start_capture(i2s);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
tegra_i2s_stop_playback(i2s);
else
tegra_i2s_stop_capture(i2s);
i2s->clk_refs--;
if (!i2s->clk_refs)
clk_disable(i2s->clk_i2s);
break;
default:
return -EINVAL;
}
return 0;
}
static int tegra_i2s_probe(struct snd_soc_dai *dai)
{
struct tegra_i2s * i2s = snd_soc_dai_get_drvdata(dai);
dai->capture_dma_data = &i2s->capture_dma_data;
dai->playback_dma_data = &i2s->playback_dma_data;
return 0;
}
static struct snd_soc_dai_ops tegra_i2s_dai_ops = {
.set_fmt = tegra_i2s_set_fmt,
.hw_params = tegra_i2s_hw_params,
.trigger = tegra_i2s_trigger,
};
struct snd_soc_dai_driver tegra_i2s_dai[] = {
{
.name = DRV_NAME ".0",
.probe = tegra_i2s_probe,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &tegra_i2s_dai_ops,
.symmetric_rates = 1,
},
{
.name = DRV_NAME ".1",
.probe = tegra_i2s_probe,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &tegra_i2s_dai_ops,
.symmetric_rates = 1,
},
};
static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
{
struct tegra_i2s * i2s;
char clk_name[12]; /* tegra-i2s.0 */
struct resource *mem, *memregion, *dmareq;
int ret;
if ((pdev->id < 0) ||
(pdev->id >= ARRAY_SIZE(tegra_i2s_dai))) {
dev_err(&pdev->dev, "ID %d out of range\n", pdev->id);
return -EINVAL;
}
/*
* FIXME: Until a codec driver exists for the tegra DAS, hard-code a
* 1:1 mapping between audio controllers and audio ports.
*/
ret = tegra_das_connect_dap_to_dac(TEGRA_DAS_DAP_ID_1 + pdev->id,
TEGRA_DAS_DAP_SEL_DAC1 + pdev->id);
if (ret) {
dev_err(&pdev->dev, "Can't set up DAP connection\n");
return ret;
}
ret = tegra_das_connect_dac_to_dap(TEGRA_DAS_DAC_ID_1 + pdev->id,
TEGRA_DAS_DAC_SEL_DAP1 + pdev->id);
if (ret) {
dev_err(&pdev->dev, "Can't set up DAC connection\n");
return ret;
}
i2s = kzalloc(sizeof(struct tegra_i2s), GFP_KERNEL);
if (!i2s) {
dev_err(&pdev->dev, "Can't allocate tegra_i2s\n");
ret = -ENOMEM;
goto exit;
}
dev_set_drvdata(&pdev->dev, i2s);
snprintf(clk_name, sizeof(clk_name), DRV_NAME ".%d", pdev->id);
i2s->clk_i2s = clk_get_sys(clk_name, NULL);
if (IS_ERR(i2s->clk_i2s)) {
dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
ret = PTR_ERR(i2s->clk_i2s);
goto err_free;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "No memory resource\n");
ret = -ENODEV;
goto err_clk_put;
}
dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmareq) {
dev_err(&pdev->dev, "No DMA resource\n");
ret = -ENODEV;
goto err_clk_put;
}
memregion = request_mem_region(mem->start, resource_size(mem),
DRV_NAME);
if (!memregion) {
dev_err(&pdev->dev, "Memory region already claimed\n");
ret = -EBUSY;
goto err_clk_put;
}
i2s->regs = ioremap(mem->start, resource_size(mem));
if (!i2s->regs) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err_release;
}
i2s->capture_dma_data.addr = mem->start + TEGRA_I2S_FIFO2;
i2s->capture_dma_data.wrap = 4;
i2s->capture_dma_data.width = 32;
i2s->capture_dma_data.req_sel = dmareq->start;
i2s->playback_dma_data.addr = mem->start + TEGRA_I2S_FIFO1;
i2s->playback_dma_data.wrap = 4;
i2s->playback_dma_data.width = 32;
i2s->playback_dma_data.req_sel = dmareq->start;
i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;
ret = snd_soc_register_dai(&pdev->dev, &tegra_i2s_dai[pdev->id]);
if (ret) {
dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
ret = -ENOMEM;
goto err_unmap;
}
tegra_i2s_debug_add(i2s, pdev->id);
return 0;
err_unmap:
iounmap(i2s->regs);
err_release:
release_mem_region(mem->start, resource_size(mem));
err_clk_put:
clk_put(i2s->clk_i2s);
err_free:
kfree(i2s);
exit:
return ret;
}
static int __devexit tegra_i2s_platform_remove(struct platform_device *pdev)
{
struct tegra_i2s *i2s = dev_get_drvdata(&pdev->dev);
struct resource *res;
snd_soc_unregister_dai(&pdev->dev);
tegra_i2s_debug_remove(i2s);
iounmap(i2s->regs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
clk_put(i2s->clk_i2s);
kfree(i2s);
return 0;
}
static struct platform_driver tegra_i2s_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = tegra_i2s_platform_probe,
.remove = __devexit_p(tegra_i2s_platform_remove),
};
static int __init snd_tegra_i2s_init(void)
{
return platform_driver_register(&tegra_i2s_driver);
}
module_init(snd_tegra_i2s_init);
static void __exit snd_tegra_i2s_exit(void)
{
platform_driver_unregister(&tegra_i2s_driver);
}
module_exit(snd_tegra_i2s_exit);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra I2S ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);