[deliverable/linux.git] / sound / soc / tegra / tegra_asoc_utils.c

/*
 * 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/device.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.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:
		new_baseclock = 56448000;
		break;
	case 8000:
	case 16000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		new_baseclock = 73728000;
		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(data->clk_cdev1);
	clk_disable(data->clk_pll_a_out0);
	clk_disable(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 rate; its locked to pll_a_out0 */

	err = clk_enable(data->clk_pll_a);
	if (err) {
		dev_err(data->dev, "Can't enable pll_a: %d\n", err);
		return err;
	}

	err = clk_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_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_init(struct tegra_asoc_utils_data *data,
			  struct device *dev)
{
	int ret;

	data->dev = dev;

	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;
	}

	data->clk_cdev1 = clk_get_sys(NULL, "cdev1");
	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;
	}

	return 0;

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");
Commit	Line	Data
a50a399b SW	1	/*
	2	* tegra_asoc_utils.c - Harmony machine ASoC driver
	3	*
	4	* Author: Stephen Warren <swarren@nvidia.com>
	5	* Copyright (C) 2010 - NVIDIA, Inc.
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
	23	#include <linux/clk.h>
d64e57ce	24	#include <linux/device.h>
a50a399b SW	25	#include <linux/err.h>
a50a399b SW	26	#include <linux/kernel.h>
da155d5b	27	#include <linux/module.h>
a50a399b SW	28
	29	#include "tegra_asoc_utils.h"
	30
d64e57ce	31	int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
07541396	32	int mclk)
a50a399b SW	33	{
a50a399b SW	34	int new_baseclock;
07541396	35	bool clk_change;
a50a399b SW	36	int err;
	37
	38	switch (srate) {
	39	case 11025:
	40	case 22050:
	41	case 44100:
	42	case 88200:
	43	new_baseclock = 56448000;
	44	break;
	45	case 8000:
	46	case 16000:
	47	case 32000:
	48	case 48000:
	49	case 64000:
	50	case 96000:
	51	new_baseclock = 73728000;
	52	break;
	53	default:
	54	return -EINVAL;
	55	}
	56
07541396	57	clk_change = ((new_baseclock != data->set_baseclock) \|\|
d64e57ce	58	(mclk != data->set_mclk));
07541396 SW	59	if (!clk_change)
07541396 SW	60	return 0;
a50a399b	61
d64e57ce SW	62	data->set_baseclock = 0;
d64e57ce SW	63	data->set_mclk = 0;
a50a399b	64
d64e57ce SW	65	clk_disable(data->clk_cdev1);
	66	clk_disable(data->clk_pll_a_out0);
	67	clk_disable(data->clk_pll_a);
a50a399b	68
d64e57ce	69	err = clk_set_rate(data->clk_pll_a, new_baseclock);
a50a399b	70	if (err) {
d64e57ce	71	dev_err(data->dev, "Can't set pll_a rate: %d\n", err);
a50a399b SW	72	return err;
	73	}
	74
d64e57ce	75	err = clk_set_rate(data->clk_pll_a_out0, mclk);
a50a399b	76	if (err) {
d64e57ce	77	dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err);
a50a399b SW	78	return err;
	79	}
	80
	81	/* Don't set cdev1 rate; its locked to pll_a_out0 */
	82
d64e57ce	83	err = clk_enable(data->clk_pll_a);
a50a399b	84	if (err) {
d64e57ce	85	dev_err(data->dev, "Can't enable pll_a: %d\n", err);
a50a399b SW	86	return err;
	87	}
	88
d64e57ce	89	err = clk_enable(data->clk_pll_a_out0);
a50a399b	90	if (err) {
d64e57ce	91	dev_err(data->dev, "Can't enable pll_a_out0: %d\n", err);
a50a399b SW	92	return err;
	93	}
	94
d64e57ce	95	err = clk_enable(data->clk_cdev1);
a50a399b	96	if (err) {
d64e57ce	97	dev_err(data->dev, "Can't enable cdev1: %d\n", err);
a50a399b SW	98	return err;
	99	}
	100
d64e57ce SW	101	data->set_baseclock = new_baseclock;
d64e57ce SW	102	data->set_mclk = mclk;
a50a399b SW	103
	104	return 0;
	105	}
a3cd50de	106	EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_rate);
a50a399b	107
d64e57ce SW	108	int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
d64e57ce SW	109	struct device *dev)
a50a399b SW	110	{
	111	int ret;
	112
d64e57ce SW	113	data->dev = dev;
	114
	115	data->clk_pll_a = clk_get_sys(NULL, "pll_a");
	116	if (IS_ERR(data->clk_pll_a)) {
	117	dev_err(data->dev, "Can't retrieve clk pll_a\n");
	118	ret = PTR_ERR(data->clk_pll_a);
a50a399b SW	119	goto err;
	120	}
	121
d64e57ce SW	122	data->clk_pll_a_out0 = clk_get_sys(NULL, "pll_a_out0");
	123	if (IS_ERR(data->clk_pll_a_out0)) {
	124	dev_err(data->dev, "Can't retrieve clk pll_a_out0\n");
	125	ret = PTR_ERR(data->clk_pll_a_out0);
422650e6	126	goto err_put_pll_a;
a50a399b SW	127	}
a50a399b SW	128
d64e57ce SW	129	data->clk_cdev1 = clk_get_sys(NULL, "cdev1");
	130	if (IS_ERR(data->clk_cdev1)) {
	131	dev_err(data->dev, "Can't retrieve clk cdev1\n");
	132	ret = PTR_ERR(data->clk_cdev1);
422650e6	133	goto err_put_pll_a_out0;
a50a399b SW	134	}
	135
	136	return 0;
	137
422650e6	138	err_put_pll_a_out0:
d64e57ce	139	clk_put(data->clk_pll_a_out0);
422650e6	140	err_put_pll_a:
d64e57ce	141	clk_put(data->clk_pll_a);
a50a399b	142	err:
a50a399b SW	143	return ret;
a50a399b SW	144	}
a3cd50de	145	EXPORT_SYMBOL_GPL(tegra_asoc_utils_init);
a50a399b	146
d64e57ce	147	void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data)
a50a399b	148	{
d64e57ce SW	149	clk_put(data->clk_cdev1);
	150	clk_put(data->clk_pll_a_out0);
	151	clk_put(data->clk_pll_a);
a50a399b	152	}
a3cd50de	153	EXPORT_SYMBOL_GPL(tegra_asoc_utils_fini);
a50a399b	154
a3cd50de SW	155	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
	156	MODULE_DESCRIPTION("Tegra ASoC utility code");
	157	MODULE_LICENSE("GPL");