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/*
* tegra_asoc_utils.c - Harmony machine ASoC driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2010,2012 - 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/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
new_baseclock = 564480000;
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
new_baseclock = 552960000;
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);
clk_disable_unprepare(data->clk_pll_a_out0);
clk_disable_unprepare(data->clk_pll_a);
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_pll_a);
if (err) {
dev_err(data->dev, "Can't enable pll_a: %d\n", err);
return err;
}
err = clk_prepare_enable(data->clk_pll_a_out0);
if (err) {
dev_err(data->dev, "Can't enable pll_a_out0: %d\n", err);
return err;
}
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);
clk_disable_unprepare(data->clk_pll_a_out0);
clk_disable_unprepare(data->clk_pll_a);
/*
* 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_pll_a);
if (err) {
dev_err(data->dev, "Can't enable pll_a: %d\n", err);
return err;
}
err = clk_prepare_enable(data->clk_pll_a_out0);
if (err) {
dev_err(data->dev, "Can't enable pll_a_out0: %d\n", err);
return err;
}
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)
{
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 (!dev->of_node)
/* non-DT is always Tegra20 */
data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20;
else
/* DT boot, but unknown SoC */
return -EINVAL;
data->clk_pll_a = clk_get_sys(NULL, "pll_a");
if (IS_ERR(data->clk_pll_a)) {
dev_err(data->dev, "Can't retrieve clk pll_a\n");
ret = PTR_ERR(data->clk_pll_a);
goto err;
}
data->clk_pll_a_out0 = clk_get_sys(NULL, "pll_a_out0");
if (IS_ERR(data->clk_pll_a_out0)) {
dev_err(data->dev, "Can't retrieve clk pll_a_out0\n");
ret = PTR_ERR(data->clk_pll_a_out0);
goto err_put_pll_a;
}
if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA20)
data->clk_cdev1 = clk_get_sys(NULL, "cdev1");
else
data->clk_cdev1 = clk_get_sys("extern1", NULL);
if (IS_ERR(data->clk_cdev1)) {
dev_err(data->dev, "Can't retrieve clk cdev1\n");
ret = PTR_ERR(data->clk_cdev1);
goto err_put_pll_a_out0;
}
ret = tegra_asoc_utils_set_rate(data, 44100, 256 * 44100);
if (ret)
goto err_put_cdev1;
return 0;
err_put_cdev1:
clk_put(data->clk_cdev1);
err_put_pll_a_out0:
clk_put(data->clk_pll_a_out0);
err_put_pll_a:
clk_put(data->clk_pll_a);
err:
return ret;
}
EXPORT_SYMBOL_GPL(tegra_asoc_utils_init);
void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data)
{
clk_put(data->clk_cdev1);
clk_put(data->clk_pll_a_out0);
clk_put(data->clk_pll_a);
}
EXPORT_SYMBOL_GPL(tegra_asoc_utils_fini);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra ASoC utility code");
MODULE_LICENSE("GPL");
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