Many portions of Tegra ASoC machine drivers will be similar or identical. To avoid cut/paste, this file will act as a repository for all that common code. For now, it solely includes code to reprogram the audio PLL for 44.1KHz- vs. 48KHz-based sample rates.
Signed-Off-By: Stephen Warren swarren@nvidia.com --- sound/soc/tegra/tegra_asoc_utils.c | 154 ++++++++++++++++++++++++++++++++++++ sound/soc/tegra/tegra_asoc_utils.h | 31 +++++++ 2 files changed, 185 insertions(+), 0 deletions(-) create mode 100644 sound/soc/tegra/tegra_asoc_utils.c create mode 100644 sound/soc/tegra/tegra_asoc_utils.h
diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c new file mode 100644 index 0000000..711ab7f --- /dev/null +++ b/sound/soc/tegra/tegra_asoc_utils.c @@ -0,0 +1,154 @@ +/* + * tegra_asoc_utils.c - Harmony machine ASoC driver + * + * Author: Stephen Warren swarren@nvidia.com + * Copyright (C) 2010 - 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/err.h> +#include <linux/kernel.h> + +#include "tegra_asoc_utils.h" + +#define PREFIX "ASoC Tegra: " + +static struct clk *clk_pll_a; +static struct clk *clk_pll_a_out0; +static struct clk *clk_cdev1; + +static int set_baseclock, set_mclk; + +int tegra_asoc_utils_set_rate(int srate, int mclk, int *mclk_change) +{ + int new_baseclock; + int err; + + switch (srate) { + case 11025: + case 22050: + case 44100: + case 88200: + new_baseclock = 56448000; + break; + case 8000: + case 16000: + case 32000: + case 48000: + case 64000: + case 96000: + new_baseclock = 73728000; + break; + default: + return -EINVAL; + } + + *mclk_change = ((new_baseclock != set_baseclock) || + (mclk != set_mclk)); + if (!*mclk_change) + return 0; + + set_baseclock = 0; + set_mclk = 0; + + clk_disable(clk_cdev1); + clk_disable(clk_pll_a_out0); + clk_disable(clk_pll_a); + + err = clk_set_rate(clk_pll_a, new_baseclock); + if (err) { + pr_err(PREFIX "Can't set pll_a rate: %d\n", err); + return err; + } + + err = clk_set_rate(clk_pll_a_out0, mclk); + if (err) { + pr_err(PREFIX "Can't set pll_a_out0 rate: %d\n", err); + return err; + } + + /* Don't set cdev1 rate; its locked to pll_a_out0 */ + + err = clk_enable(clk_pll_a); + if (err) { + pr_err(PREFIX "Can't enable pll_a: %d\n", err); + return err; + } + + err = clk_enable(clk_pll_a_out0); + if (err) { + pr_err(PREFIX "Can't enable pll_a_out0: %d\n", err); + return err; + } + + err = clk_enable(clk_cdev1); + if (err) { + pr_err(PREFIX "Can't enable cdev1: %d\n", err); + return err; + } + + set_baseclock = new_baseclock; + set_mclk = mclk; + + return 0; +} + +int tegra_asoc_utils_init(void) +{ + int ret; + + clk_pll_a = clk_get_sys(NULL, "pll_a"); + if (IS_ERR_OR_NULL(clk_pll_a)) { + pr_err(PREFIX "Can't retrieve clk pll_a\n"); + ret = PTR_ERR(clk_pll_a); + goto err; + } + + clk_pll_a_out0 = clk_get_sys(NULL, "pll_a_out0"); + if (IS_ERR_OR_NULL(clk_pll_a_out0)) { + pr_err(PREFIX "Can't retrieve clk pll_a_out0\n"); + ret = PTR_ERR(clk_pll_a_out0); + goto err; + } + + clk_cdev1 = clk_get_sys(NULL, "cdev1"); + if (IS_ERR_OR_NULL(clk_cdev1)) { + pr_err(PREFIX "Can't retrieve clk cdev1\n"); + ret = PTR_ERR(clk_cdev1); + goto err; + } + + return 0; + +err: + if (!IS_ERR_OR_NULL(clk_cdev1)) + clk_put(clk_cdev1); + if (!IS_ERR_OR_NULL(clk_pll_a_out0)) + clk_put(clk_pll_a_out0); + if (!IS_ERR_OR_NULL(clk_pll_a)) + clk_put(clk_pll_a); + return ret; +} + +void tegra_asoc_utils_fini(void) +{ + clk_put(clk_cdev1); + clk_put(clk_pll_a_out0); + clk_put(clk_pll_a); +} + diff --git a/sound/soc/tegra/tegra_asoc_utils.h b/sound/soc/tegra/tegra_asoc_utils.h new file mode 100644 index 0000000..855f8f6 --- /dev/null +++ b/sound/soc/tegra/tegra_asoc_utils.h @@ -0,0 +1,31 @@ +/* + * tegra_asoc_utils.h - Definitions for Tegra DAS driver + * + * Author: Stephen Warren swarren@nvidia.com + * Copyright (C) 2010 - 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 + * + */ + +#ifndef __TEGRA_ASOC_UTILS_H__ +#define __TEGRA_ASOC_UTILS_H_ + +int tegra_asoc_utils_set_rate(int srate, int mclk_rate, int *mclk_change); +int tegra_asoc_utils_init(void); +void tegra_asoc_utils_fini(void); + +#endif +