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/*
* Taken from linux/drivers/clk/
*
* Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
*
* 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 <common.h>
#include <io.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
struct clk_composite {
struct clk clk;
struct clk *mux_clk;
struct clk *rate_clk;
struct clk *gate_clk;
};
#define to_clk_composite(_clk) container_of(_clk, struct clk_composite, clk)
static int clk_composite_get_parent(struct clk *clk)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *mux_clk = composite->mux_clk;
return mux_clk ? mux_clk->ops->get_parent(mux_clk) : 0;
}
static int clk_composite_set_parent(struct clk *clk, u8 index)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *mux_clk = composite->mux_clk;
return mux_clk ? mux_clk->ops->set_parent(mux_clk, index) : 0;
}
static unsigned long clk_composite_recalc_rate(struct clk *clk,
unsigned long parent_rate)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *rate_clk = composite->rate_clk;
if (rate_clk)
return rate_clk->ops->recalc_rate(rate_clk, parent_rate);
return parent_rate;
}
static long clk_composite_round_rate(struct clk *clk, unsigned long rate,
unsigned long *prate)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *rate_clk = composite->rate_clk;
return rate_clk ? rate_clk->ops->round_rate(rate_clk, rate, prate) : 0;
}
static int clk_composite_set_rate(struct clk *clk, unsigned long rate,
unsigned long parent_rate)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *rate_clk = composite->rate_clk;
return rate_clk ?
rate_clk->ops->set_rate(rate_clk, rate, parent_rate) : 0;
}
static int clk_composite_is_enabled(struct clk *clk)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *gate_clk = composite->gate_clk;
return gate_clk ? gate_clk->ops->is_enabled(gate_clk) : 0;
}
static int clk_composite_enable(struct clk *clk)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *gate_clk = composite->gate_clk;
return gate_clk ? gate_clk->ops->enable(gate_clk) : 0;
}
static void clk_composite_disable(struct clk *clk)
{
struct clk_composite *composite = to_clk_composite(clk);
struct clk *gate_clk = composite->gate_clk;
if (gate_clk)
gate_clk->ops->disable(gate_clk);
}
static struct clk_ops clk_composite_ops = {
.get_parent = clk_composite_get_parent,
.set_parent = clk_composite_set_parent,
.recalc_rate = clk_composite_recalc_rate,
.round_rate = clk_composite_round_rate,
.set_rate = clk_composite_set_rate,
.is_enabled = clk_composite_is_enabled,
.enable = clk_composite_enable,
.disable = clk_composite_disable,
};
struct clk *clk_register_composite(const char *name,
const char * const *parent_names, int num_parents,
struct clk *mux_clk,
struct clk *rate_clk,
struct clk *gate_clk,
unsigned long flags)
{
struct clk_composite *composite;
int ret;
composite = xzalloc(sizeof(*composite));
composite->clk.name = name;
composite->clk.ops = &clk_composite_ops;
composite->clk.flags = flags;
composite->clk.parent_names = parent_names;
composite->clk.num_parents = num_parents;
composite->mux_clk = mux_clk;
composite->rate_clk = rate_clk;
composite->gate_clk = gate_clk;
ret = clk_register(&composite->clk);
if (ret)
goto err;
return &composite->clk;
err:
kfree(composite);
return 0;
}
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