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/*
* Copyright 2017 NXP
*
* Dong Aisheng <aisheng.dong@nxp.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/slab.h>
static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
struct clk_bulk_data *clks)
{
int ret;
int i;
for (i = 0; i < num_clks; i++)
clks[i].clk = NULL;
for (i = 0; i < num_clks; i++) {
clks[i].clk = of_clk_get(np, i);
if (IS_ERR(clks[i].clk)) {
ret = PTR_ERR(clks[i].clk);
pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
np, i, ret);
clks[i].clk = NULL;
goto err;
}
}
return 0;
err:
clk_bulk_put(i, clks);
return ret;
}
static int __must_check of_clk_bulk_get_all(struct device_node *np,
struct clk_bulk_data **clks)
{
struct clk_bulk_data *clk_bulk;
int num_clks;
int ret;
num_clks = of_clk_get_parent_count(np);
if (!num_clks)
return 0;
clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
if (!clk_bulk)
return -ENOMEM;
ret = of_clk_bulk_get(np, num_clks, clk_bulk);
if (ret) {
kfree(clk_bulk);
return ret;
}
*clks = clk_bulk;
return num_clks;
}
void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
{
while (--num_clks >= 0) {
clk_put(clks[num_clks].clk);
clks[num_clks].clk = NULL;
}
}
EXPORT_SYMBOL_GPL(clk_bulk_put);
int __must_check clk_bulk_get(struct device *dev, int num_clks,
struct clk_bulk_data *clks)
{
int ret;
int i;
for (i = 0; i < num_clks; i++)
clks[i].clk = NULL;
for (i = 0; i < num_clks; i++) {
clks[i].clk = clk_get(dev, clks[i].id);
if (IS_ERR(clks[i].clk)) {
ret = PTR_ERR(clks[i].clk);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Failed to get clk '%s': %d\n",
clks[i].id, ret);
clks[i].clk = NULL;
goto err;
}
}
return 0;
err:
clk_bulk_put(i, clks);
return ret;
}
EXPORT_SYMBOL(clk_bulk_get);
void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
{
if (IS_ERR_OR_NULL(clks))
return;
clk_bulk_put(num_clks, clks);
kfree(clks);
}
EXPORT_SYMBOL(clk_bulk_put_all);
int __must_check clk_bulk_get_all(struct device *dev,
struct clk_bulk_data **clks)
{
struct device_node *np = dev_of_node(dev);
if (!np)
return 0;
return of_clk_bulk_get_all(np, clks);
}
EXPORT_SYMBOL(clk_bulk_get_all);
#ifdef CONFIG_HAVE_CLK_PREPARE
/**
* clk_bulk_unprepare - undo preparation of a set of clock sources
* @num_clks: the number of clk_bulk_data
* @clks: the clk_bulk_data table being unprepared
*
* clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable.
* Returns 0 on success, -EERROR otherwise.
*/
void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks)
{
while (--num_clks >= 0)
clk_unprepare(clks[num_clks].clk);
}
EXPORT_SYMBOL_GPL(clk_bulk_unprepare);
/**
* clk_bulk_prepare - prepare a set of clocks
* @num_clks: the number of clk_bulk_data
* @clks: the clk_bulk_data table being prepared
*
* clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable.
* Returns 0 on success, -EERROR otherwise.
*/
int __must_check clk_bulk_prepare(int num_clks,
const struct clk_bulk_data *clks)
{
int ret;
int i;
for (i = 0; i < num_clks; i++) {
ret = clk_prepare(clks[i].clk);
if (ret) {
pr_err("Failed to prepare clk '%s': %d\n",
clks[i].id, ret);
goto err;
}
}
return 0;
err:
clk_bulk_unprepare(i, clks);
return ret;
}
EXPORT_SYMBOL_GPL(clk_bulk_prepare);
#endif /* CONFIG_HAVE_CLK_PREPARE */
/**
* clk_bulk_disable - gate a set of clocks
* @num_clks: the number of clk_bulk_data
* @clks: the clk_bulk_data table being gated
*
* clk_bulk_disable must not sleep, which differentiates it from
* clk_bulk_unprepare. clk_bulk_disable must be called before
* clk_bulk_unprepare.
*/
void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks)
{
while (--num_clks >= 0)
clk_disable(clks[num_clks].clk);
}
EXPORT_SYMBOL_GPL(clk_bulk_disable);
/**
* clk_bulk_enable - ungate a set of clocks
* @num_clks: the number of clk_bulk_data
* @clks: the clk_bulk_data table being ungated
*
* clk_bulk_enable must not sleep
* Returns 0 on success, -EERROR otherwise.
*/
int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks)
{
int ret;
int i;
for (i = 0; i < num_clks; i++) {
ret = clk_enable(clks[i].clk);
if (ret) {
pr_err("Failed to enable clk '%s': %d\n",
clks[i].id, ret);
goto err;
}
}
return 0;
err:
clk_bulk_disable(i, clks);
return ret;
}
EXPORT_SYMBOL_GPL(clk_bulk_enable);
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