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/*
* tegra20_spdif.c - Tegra20 SPDIF driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2011-2012 - NVIDIA, Inc.
*
* 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 "tegra20_spdif.h"
#define DRV_NAME "tegra-spdif"
static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
u32 val)
{
__raw_writel(val, spdif->regs + reg);
}
static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
{
return __raw_readl(spdif->regs + reg);
}
#ifdef CONFIG_DEBUG_FS
static int tegra_spdif_show(struct seq_file *s, void *unused)
{
#define REG(r) { r, #r }
static const struct {
int offset;
const char *name;
} regs[] = {
REG(TEGRA_SPDIF_CTRL),
REG(TEGRA_SPDIF_STATUS),
REG(TEGRA_SPDIF_STROBE_CTRL),
REG(TEGRA_SPDIF_DATA_FIFO_CSR),
REG(TEGRA_SPDIF_CH_STA_RX_A),
REG(TEGRA_SPDIF_CH_STA_RX_B),
REG(TEGRA_SPDIF_CH_STA_RX_C),
REG(TEGRA_SPDIF_CH_STA_RX_D),
REG(TEGRA_SPDIF_CH_STA_RX_E),
REG(TEGRA_SPDIF_CH_STA_RX_F),
REG(TEGRA_SPDIF_CH_STA_TX_A),
REG(TEGRA_SPDIF_CH_STA_TX_B),
REG(TEGRA_SPDIF_CH_STA_TX_C),
REG(TEGRA_SPDIF_CH_STA_TX_D),
REG(TEGRA_SPDIF_CH_STA_TX_E),
REG(TEGRA_SPDIF_CH_STA_TX_F),
};
#undef REG
struct tegra_spdif *spdif = s->private;
int i;
for (i = 0; i < ARRAY_SIZE(regs); i++) {
u32 val = tegra_spdif_read(spdif, regs[i].offset);
seq_printf(s, "%s = %08x\n", regs[i].name, val);
}
return 0;
}
static int tegra_spdif_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, tegra_spdif_show, inode->i_private);
}
static const struct file_operations tegra_spdif_debug_fops = {
.open = tegra_spdif_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
snd_soc_debugfs_root, spdif,
&tegra_spdif_debug_fops);
}
static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
if (spdif->debug)
debugfs_remove(spdif->debug);
}
#else
static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
}
static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
}
#endif
static int tegra_spdif_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_spdif *spdif = snd_soc_dai_get_drvdata(dai);
int ret, spdifclock;
spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK;
spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
break;
default:
return -EINVAL;
}
switch (params_rate(params)) {
case 32000:
spdifclock = 4096000;
break;
case 44100:
spdifclock = 5644800;
break;
case 48000:
spdifclock = 6144000;
break;
case 88200:
spdifclock = 11289600;
break;
case 96000:
spdifclock = 12288000;
break;
case 176400:
spdifclock = 22579200;
break;
case 192000:
spdifclock = 24576000;
break;
default:
return -EINVAL;
}
ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
if (ret) {
dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
return ret;
}
return 0;
}
static void tegra_spdif_start_playback(struct tegra_spdif *spdif)
{
spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN;
tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}
static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
{
spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}
static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
clk_enable(spdif->clk_spdif_out);
tegra_spdif_start_playback(spdif);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
tegra_spdif_stop_playback(spdif);
clk_disable(spdif->clk_spdif_out);
break;
default:
return -EINVAL;
}
return 0;
}
static int tegra_spdif_probe(struct snd_soc_dai *dai)
{
struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
dai->capture_dma_data = NULL;
dai->playback_dma_data = &spdif->playback_dma_data;
return 0;
}
static const struct snd_soc_dai_ops tegra_spdif_dai_ops = {
.hw_params = tegra_spdif_hw_params,
.trigger = tegra_spdif_trigger,
};
static struct snd_soc_dai_driver tegra_spdif_dai = {
.name = DRV_NAME,
.probe = tegra_spdif_probe,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &tegra_spdif_dai_ops,
};
static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
{
struct tegra_spdif *spdif;
struct resource *mem, *memregion, *dmareq;
int ret;
spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
if (!spdif) {
dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
ret = -ENOMEM;
goto exit;
}
dev_set_drvdata(&pdev->dev, spdif);
spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
if (IS_ERR(spdif->clk_spdif_out)) {
pr_err("Can't retrieve spdif clock\n");
ret = PTR_ERR(spdif->clk_spdif_out);
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;
}
spdif->regs = ioremap(mem->start, resource_size(mem));
if (!spdif->regs) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err_release;
}
spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
spdif->playback_dma_data.wrap = 4;
spdif->playback_dma_data.width = 32;
spdif->playback_dma_data.req_sel = dmareq->start;
ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
if (ret) {
dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
ret = -ENOMEM;
goto err_unmap;
}
ret = tegra_pcm_platform_register(&pdev->dev);
if (ret) {
dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
goto err_unregister_dai;
}
tegra_spdif_debug_add(spdif);
return 0;
err_unregister_dai:
snd_soc_unregister_dai(&pdev->dev);
err_unmap:
iounmap(spdif->regs);
err_release:
release_mem_region(mem->start, resource_size(mem));
err_clk_put:
clk_put(spdif->clk_spdif_out);
err_free:
kfree(spdif);
exit:
return ret;
}
static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
{
struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
struct resource *res;
tegra_pcm_platform_unregister(&pdev->dev);
snd_soc_unregister_dai(&pdev->dev);
tegra_spdif_debug_remove(spdif);
iounmap(spdif->regs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
clk_put(spdif->clk_spdif_out);
kfree(spdif);
return 0;
}
static struct platform_driver tegra_spdif_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = tegra_spdif_platform_probe,
.remove = __devexit_p(tegra_spdif_platform_remove),
};
module_platform_driver(tegra_spdif_driver);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra SPDIF ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
|