alistair23-linux/drivers/clk/clk-bulk.c

/*
 * 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);