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Diffstat (limited to '')
| -rw-r--r-- | sound/soc/tegra/tegra_asoc_utils.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c new file mode 100644 index 000000000..587f62a28 --- /dev/null +++ b/sound/soc/tegra/tegra_asoc_utils.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * tegra_asoc_utils.c - Harmony machine ASoC driver + * + * Author: Stephen Warren <swarren@nvidia.com> + * Copyright (C) 2010,2012 - NVIDIA, Inc. + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> + +#include "tegra_asoc_utils.h" + +int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate, + int mclk) +{ + int new_baseclock; + bool clk_change; + int err; + + switch (srate) { + case 11025: + case 22050: + case 44100: + case 88200: + if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA20) + new_baseclock = 56448000; + else if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA30) + new_baseclock = 564480000; + else + new_baseclock = 282240000; + break; + case 8000: + case 16000: + case 32000: + case 48000: + case 64000: + case 96000: + if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA20) + new_baseclock = 73728000; + else if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA30) + new_baseclock = 552960000; + else + new_baseclock = 368640000; + break; + default: + return -EINVAL; + } + + clk_change = ((new_baseclock != data->set_baseclock) || + (mclk != data->set_mclk)); + if (!clk_change) + return 0; + + data->set_baseclock = 0; + data->set_mclk = 0; + + clk_disable_unprepare(data->clk_cdev1); + + err = clk_set_rate(data->clk_pll_a, new_baseclock); + if (err) { + dev_err(data->dev, "Can't set pll_a rate: %d\n", err); + return err; + } + + err = clk_set_rate(data->clk_pll_a_out0, mclk); + if (err) { + dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err); + return err; + } + + /* Don't set cdev1/extern1 rate; it's locked to pll_a_out0 */ + + err = clk_prepare_enable(data->clk_cdev1); + if (err) { + dev_err(data->dev, "Can't enable cdev1: %d\n", err); + return err; + } + + data->set_baseclock = new_baseclock; + data->set_mclk = mclk; + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_rate); + +int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data) +{ + const int pll_rate = 73728000; + const int ac97_rate = 24576000; + int err; + + clk_disable_unprepare(data->clk_cdev1); + + /* + * AC97 rate is fixed at 24.576MHz and is used for both the host + * controller and the external codec + */ + err = clk_set_rate(data->clk_pll_a, pll_rate); + if (err) { + dev_err(data->dev, "Can't set pll_a rate: %d\n", err); + return err; + } + + err = clk_set_rate(data->clk_pll_a_out0, ac97_rate); + if (err) { + dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err); + return err; + } + + /* Don't set cdev1/extern1 rate; it's locked to pll_a_out0 */ + + err = clk_prepare_enable(data->clk_cdev1); + if (err) { + dev_err(data->dev, "Can't enable cdev1: %d\n", err); + return err; + } + + data->set_baseclock = pll_rate; + data->set_mclk = ac97_rate; + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_ac97_rate); + +int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data, + struct device *dev) +{ + struct clk *clk_out_1, *clk_extern1; + int ret; + + data->dev = dev; + + if (of_machine_is_compatible("nvidia,tegra20")) + data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20; + else if (of_machine_is_compatible("nvidia,tegra30")) + data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA30; + else if (of_machine_is_compatible("nvidia,tegra114")) + data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA114; + else if (of_machine_is_compatible("nvidia,tegra124")) + data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA124; + else { + dev_err(data->dev, "SoC unknown to Tegra ASoC utils\n"); + return -EINVAL; + } + + data->clk_pll_a = devm_clk_get(dev, "pll_a"); + if (IS_ERR(data->clk_pll_a)) { + dev_err(data->dev, "Can't retrieve clk pll_a\n"); + return PTR_ERR(data->clk_pll_a); + } + + data->clk_pll_a_out0 = devm_clk_get(dev, "pll_a_out0"); + if (IS_ERR(data->clk_pll_a_out0)) { + dev_err(data->dev, "Can't retrieve clk pll_a_out0\n"); + return PTR_ERR(data->clk_pll_a_out0); + } + + data->clk_cdev1 = devm_clk_get(dev, "mclk"); + if (IS_ERR(data->clk_cdev1)) { + dev_err(data->dev, "Can't retrieve clk cdev1\n"); + return PTR_ERR(data->clk_cdev1); + } + + /* + * If clock parents are not set in DT, configure here to use clk_out_1 + * as mclk and extern1 as parent for Tegra30 and higher. + */ + if (!of_find_property(dev->of_node, "assigned-clock-parents", NULL) && + data->soc > TEGRA_ASOC_UTILS_SOC_TEGRA20) { + dev_warn(data->dev, + "Configuring clocks for a legacy device-tree\n"); + dev_warn(data->dev, + "Please update DT to use assigned-clock-parents\n"); + clk_extern1 = devm_clk_get(dev, "extern1"); + if (IS_ERR(clk_extern1)) { + dev_err(data->dev, "Can't retrieve clk extern1\n"); + return PTR_ERR(clk_extern1); + } + + ret = clk_set_parent(clk_extern1, data->clk_pll_a_out0); + if (ret < 0) { + dev_err(data->dev, + "Set parent failed for clk extern1\n"); + return ret; + } + + clk_out_1 = devm_clk_get(dev, "pmc_clk_out_1"); + if (IS_ERR(clk_out_1)) { + dev_err(data->dev, "Can't retrieve pmc_clk_out_1\n"); + return PTR_ERR(clk_out_1); + } + + ret = clk_set_parent(clk_out_1, clk_extern1); + if (ret < 0) { + dev_err(data->dev, + "Set parent failed for pmc_clk_out_1\n"); + return ret; + } + + data->clk_cdev1 = clk_out_1; + } + + /* + * FIXME: There is some unknown dependency between audio mclk disable + * and suspend-resume functionality on Tegra30, although audio mclk is + * only needed for audio. + */ + ret = clk_prepare_enable(data->clk_cdev1); + if (ret) { + dev_err(data->dev, "Can't enable cdev1: %d\n", ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_asoc_utils_init); + +MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); +MODULE_DESCRIPTION("Tegra ASoC utility code"); +MODULE_LICENSE("GPL"); |