422650e65a
A recent discussion on linux-arm-kernel noted that the value returned by clk_get_sys is an opaque token, and not strictly a pointer; it is meaningful only to the clock API, clients should not dereference the value, and the clock API must accept any non-IS_ERR value it returned. Hence, only IS_ERR is appropriate to interpret the result, not IS_ERR_OR_NULL. I checked that clk_get_sys in both ASoC's for-next and Tegra's for-next do behave as described; NULL is not returned in the case of error. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
153 lines
3.1 KiB
C
153 lines
3.1 KiB
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/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(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(clk_pll_a_out0)) {
|
|
pr_err(PREFIX "Can't retrieve clk pll_a_out0\n");
|
|
ret = PTR_ERR(clk_pll_a_out0);
|
|
goto err_put_pll_a;
|
|
}
|
|
|
|
clk_cdev1 = clk_get_sys(NULL, "cdev1");
|
|
if (IS_ERR(clk_cdev1)) {
|
|
pr_err(PREFIX "Can't retrieve clk cdev1\n");
|
|
ret = PTR_ERR(clk_cdev1);
|
|
goto err_put_pll_a_out0;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_put_pll_a_out0:
|
|
clk_put(clk_pll_a_out0);
|
|
err_put_pll_a:
|
|
clk_put(clk_pll_a);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
void tegra_asoc_utils_fini(void)
|
|
{
|
|
clk_put(clk_cdev1);
|
|
clk_put(clk_pll_a_out0);
|
|
clk_put(clk_pll_a);
|
|
}
|
|
|