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