// SPDX-License-Identifier: GPL-2.0-only
//
// tegra_audio_graph_card.c - Audio Graph based Tegra Machine Driver
//
// Copyright (c) 2020-2021 NVIDIA CORPORATION. All rights reserved.
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/graph_card.h>
#include <sound/pcm_params.h>
#include <sound/soc-dai.h>
#define MAX_PLLA_OUT0_DIV 128
#define simple_to_tegra_priv(simple) \
container_of(simple, struct tegra_audio_priv, simple)
enum srate_type {
/*
* Sample rates multiple of 8000 Hz and below are supported:
* ( 8000, 16000, 32000, 48000, 96000, 192000 Hz )
*/
x8_RATE,
/*
* Sample rates multiple of 11025 Hz and below are supported:
* ( 11025, 22050, 44100, 88200, 176400 Hz )
*/
x11_RATE,
NUM_RATE_TYPE,
};
struct tegra_audio_priv {
struct simple_util_priv simple;
struct clk *clk_plla_out0;
struct clk *clk_plla;
};
/* Tegra audio chip data */
struct tegra_audio_cdata {
unsigned int plla_rates[NUM_RATE_TYPE];
unsigned int plla_out0_rates[NUM_RATE_TYPE];
};
static bool need_clk_update(struct snd_soc_dai *dai)
{
if (snd_soc_dai_is_dummy(dai) ||
!dai->driver->ops ||
!dai->driver->name)
return false;
if (strstr(dai->driver->name, "I2S") ||
strstr(dai->driver->name, "DMIC") ||
strstr(dai->driver->name, "DSPK"))
return true;
return false;
}
/* Setup PLL clock as per the given sample rate */
static int tegra_audio_graph_update_pll(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct simple_util_priv *simple = snd_soc_card_get_drvdata(rtd->card);
struct tegra_audio_priv *priv = simple_to_tegra_priv(simple);
struct device *dev = rtd->card->dev;
const struct tegra_audio_cdata *data = of_device_get_match_data(dev);
unsigned int plla_rate, plla_out0_rate, bclk;
unsigned int srate = params_rate(params);
int err;
switch (srate) {
case 11025:
case 22050:
case 44100:
case 88200:
case 176400:
plla_out0_rate = data->plla_out0_rates[x11_RATE];
plla_rate = data->plla_rates[x11_RATE];
break;
case 8000:
case 16000:
case 32000:
case 48000:
case 96000:
case 192000:
plla_out0_rate = data->plla_out0_rates[x8_RATE];
plla_rate = data->plla_rates[x8_RATE];
break;
default:
dev_err(rtd->card->dev, "Unsupported sample rate %u\n",
srate);
return -EINVAL;
}
/*
* Below is the clock relation:
*
* PLLA
* |
* |--> PLLA_OUT0
* |
* |---> I2S modules
* |
* |---> DMIC modules
* |
* |---> DSPK modules
*
*
* Default PLLA_OUT0 rate might be too high when I/O is running
* at minimum PCM configurations. This may result in incorrect
* clock rates and glitchy audio. The maximum divider is 128
* and any thing higher than that won't work. Thus reduce PLLA_OUT0
* to work for lower configurations.
*
* This problem is seen for I2S only, as DMIC and DSPK minimum
* clock requirements are under allowed divider limits.
*/
bclk = srate * params_channels(params) * params_width(params);
if (div_u64(plla_out0_rate, bclk) > MAX_PLLA_OUT0_DIV)
plla_out0_rate >>= 1;
dev_dbg(rtd->card->dev,
"Update clock rates: PLLA(= %u Hz) and PLLA_OUT0(= %u Hz)\n",
plla_rate, plla_out0_rate);
/* Set PLLA rate */
err = clk_set_rate(priv->clk_plla, plla_rate);
if (err) {
dev_err(rtd->card->dev,
"Can't set plla rate for %u, err: %d\n",
plla_rate, err);
return err;
}
/* Set PLLA_OUT0 rate */
err = clk_set_rate(priv->clk_plla_out0, plla_out0_rate);
if (err) {
dev_err(rtd->card->dev,
"Can't set plla_out0 rate %u, err: %d\n",
plla_out0_rate, err);
return err;
}
return err;
}
static int tegra_audio_graph_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
int err;
if (need_clk_update(cpu_dai)) {
err = tegra_audio_graph_update_pll(substream, params);
if (err)
return err;
}
return simple_util_hw_params(substream, params);
}
static const struct snd_soc_ops tegra_audio_graph_ops = {
.startup = simple_util_startup,
.shutdown = simple_util_shutdown,
.hw_params = tegra_audio_graph_hw_params,
};
static int tegra_audio_graph_card_probe(struct snd_soc_card *card)
{
struct simple_util_priv *simple = snd_soc_card_get_drvdata(card);
struct tegra_audio_priv *priv = simple_to_tegra_priv(simple);
priv->clk_plla = devm_clk_get(card->dev, "pll_a");
if (IS_ERR(priv->clk_plla)) {
dev_err(card->dev, "Can't retrieve clk pll_a\n");
return PTR_ERR(priv->clk_plla);
}
priv->clk_plla_out0 = devm_clk_get(card->dev, "plla_out0");
if (IS_ERR(priv->clk_plla_out0)) {
dev_err(card->dev, "Can't retrieve clk plla_out0\n");
return PTR_ERR(priv->clk_plla_out0);
}
return graph_util_card_probe(card);
}
static int tegra_audio_graph_probe(struct platform_device *pdev)
{
struct tegra_audio_priv *priv;
struct device *dev = &pdev->dev;
struct snd_soc_card *card;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
card = simple_priv_to_card(&priv->simple);
card->driver_name = "tegra-ape";
card->probe = tegra_audio_graph_card_probe;
/* audio_graph_parse_of() depends on below */
card->component_chaining = 1;
priv->simple.ops = &tegra_audio_graph_ops;
priv->simple.force_dpcm = 1;
return audio_graph_parse_of(&priv->simple, dev);
}
static const struct tegra_audio_cdata tegra210_data = {
/* PLLA */
.plla_rates[x8_RATE] = 368640000,
.plla_rates[x11_RATE] = 338688000,
/* PLLA_OUT0 */
.plla_out0_rates[x8_RATE] = 49152000,
.plla_out0_rates[x11_RATE] = 45158400,
};
static const struct tegra_audio_cdata tegra186_data = {
/* PLLA */
.plla_rates[x8_RATE] = 245760000,
.plla_rates[x11_RATE] = 270950400,
/* PLLA_OUT0 */
.plla_out0_rates[x8_RATE] = 49152000,
.plla_out0_rates[x11_RATE] = 45158400,
};
static const struct of_device_id graph_of_tegra_match[] = {
{ .compatible = "nvidia,tegra210-audio-graph-card",
.data = &tegra210_data },
{ .compatible = "nvidia,tegra186-audio-graph-card",
.data = &tegra186_data },
{},
};
MODULE_DEVICE_TABLE(of, graph_of_tegra_match);
static struct platform_driver tegra_audio_graph_card = {
.driver = {
.name = "tegra-audio-graph-card",
.pm = &snd_soc_pm_ops,
.of_match_table = graph_of_tegra_match,
},
.probe = tegra_audio_graph_probe,
.remove = simple_util_remove,
};
module_platform_driver(tegra_audio_graph_card);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Tegra Audio Graph Sound Card");
MODULE_AUTHOR("Sameer Pujar <[email protected]>");
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