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// SPDX-License-Identifier: GPL-2.0-only
/*
* tegra20_spdif.c - Tegra20 SPDIF driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2011-2012 - NVIDIA, Inc.
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "tegra20_spdif.h"
#define DRV_NAME "tegra20-spdif"
static int tegra20_spdif_runtime_suspend(struct device *dev)
{
struct tegra20_spdif *spdif = dev_get_drvdata(dev);
clk_disable_unprepare(spdif->clk_spdif_out);
return 0;
}
static int tegra20_spdif_runtime_resume(struct device *dev)
{
struct tegra20_spdif *spdif = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(spdif->clk_spdif_out);
if (ret) {
dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
}
return 0;
}
static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct device *dev = dai->dev;
struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
unsigned int mask = 0, val = 0;
int ret, spdifclock;
mask |= TEGRA20_SPDIF_CTRL_PACK |
TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
val |= TEGRA20_SPDIF_CTRL_PACK |
TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
break;
default:
return -EINVAL;
}
regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val);
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 tegra20_spdif_start_playback(struct tegra20_spdif *spdif)
{
regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
TEGRA20_SPDIF_CTRL_TX_EN,
TEGRA20_SPDIF_CTRL_TX_EN);
}
static void tegra20_spdif_stop_playback(struct tegra20_spdif *spdif)
{
regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
TEGRA20_SPDIF_CTRL_TX_EN, 0);
}
static int tegra20_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct tegra20_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:
tegra20_spdif_start_playback(spdif);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
tegra20_spdif_stop_playback(spdif);
break;
default:
return -EINVAL;
}
return 0;
}
static int tegra20_spdif_probe(struct snd_soc_dai *dai)
{
struct tegra20_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 tegra20_spdif_dai_ops = {
.hw_params = tegra20_spdif_hw_params,
.trigger = tegra20_spdif_trigger,
};
static struct snd_soc_dai_driver tegra20_spdif_dai = {
.name = DRV_NAME,
.probe = tegra20_spdif_probe,
.playback = {
.stream_name = "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 = &tegra20_spdif_dai_ops,
};
static const struct snd_soc_component_driver tegra20_spdif_component = {
.name = DRV_NAME,
};
static bool tegra20_spdif_wr_rd_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TEGRA20_SPDIF_CTRL:
case TEGRA20_SPDIF_STATUS:
case TEGRA20_SPDIF_STROBE_CTRL:
case TEGRA20_SPDIF_DATA_FIFO_CSR:
case TEGRA20_SPDIF_DATA_OUT:
case TEGRA20_SPDIF_DATA_IN:
case TEGRA20_SPDIF_CH_STA_RX_A:
case TEGRA20_SPDIF_CH_STA_RX_B:
case TEGRA20_SPDIF_CH_STA_RX_C:
case TEGRA20_SPDIF_CH_STA_RX_D:
case TEGRA20_SPDIF_CH_STA_RX_E:
case TEGRA20_SPDIF_CH_STA_RX_F:
case TEGRA20_SPDIF_CH_STA_TX_A:
case TEGRA20_SPDIF_CH_STA_TX_B:
case TEGRA20_SPDIF_CH_STA_TX_C:
case TEGRA20_SPDIF_CH_STA_TX_D:
case TEGRA20_SPDIF_CH_STA_TX_E:
case TEGRA20_SPDIF_CH_STA_TX_F:
case TEGRA20_SPDIF_USR_STA_RX_A:
case TEGRA20_SPDIF_USR_DAT_TX_A:
return true;
default:
return false;
}
}
static bool tegra20_spdif_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TEGRA20_SPDIF_STATUS:
case TEGRA20_SPDIF_DATA_FIFO_CSR:
case TEGRA20_SPDIF_DATA_OUT:
case TEGRA20_SPDIF_DATA_IN:
case TEGRA20_SPDIF_CH_STA_RX_A:
case TEGRA20_SPDIF_CH_STA_RX_B:
case TEGRA20_SPDIF_CH_STA_RX_C:
case TEGRA20_SPDIF_CH_STA_RX_D:
case TEGRA20_SPDIF_CH_STA_RX_E:
case TEGRA20_SPDIF_CH_STA_RX_F:
case TEGRA20_SPDIF_USR_STA_RX_A:
case TEGRA20_SPDIF_USR_DAT_TX_A:
return true;
default:
return false;
}
}
static bool tegra20_spdif_precious_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TEGRA20_SPDIF_DATA_OUT:
case TEGRA20_SPDIF_DATA_IN:
case TEGRA20_SPDIF_USR_STA_RX_A:
case TEGRA20_SPDIF_USR_DAT_TX_A:
return true;
default:
return false;
}
}
static const struct regmap_config tegra20_spdif_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = TEGRA20_SPDIF_USR_DAT_TX_A,
.writeable_reg = tegra20_spdif_wr_rd_reg,
.readable_reg = tegra20_spdif_wr_rd_reg,
.volatile_reg = tegra20_spdif_volatile_reg,
.precious_reg = tegra20_spdif_precious_reg,
.cache_type = REGCACHE_FLAT,
};
static int tegra20_spdif_platform_probe(struct platform_device *pdev)
{
struct tegra20_spdif *spdif;
struct resource *mem, *dmareq;
void __iomem *regs;
int ret;
spdif = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_spdif),
GFP_KERNEL);
if (!spdif)
return -ENOMEM;
dev_set_drvdata(&pdev->dev, spdif);
spdif->clk_spdif_out = devm_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);
return ret;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(regs))
return PTR_ERR(regs);
dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmareq) {
dev_err(&pdev->dev, "No DMA resource\n");
return -ENODEV;
}
spdif->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
&tegra20_spdif_regmap_config);
if (IS_ERR(spdif->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
ret = PTR_ERR(spdif->regmap);
return ret;
}
spdif->playback_dma_data.addr = mem->start + TEGRA20_SPDIF_DATA_OUT;
spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
spdif->playback_dma_data.maxburst = 4;
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