146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*
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* Taken from linux/drivers/clk/
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*
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* Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <io.h>
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#include <malloc.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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struct clk_composite {
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struct clk clk;
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struct clk *mux_clk;
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struct clk *rate_clk;
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struct clk *gate_clk;
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};
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#define to_clk_composite(_clk) container_of(_clk, struct clk_composite, clk)
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static int clk_composite_get_parent(struct clk *clk)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *mux_clk = composite->mux_clk;
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return mux_clk ? mux_clk->ops->get_parent(mux_clk) : 0;
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}
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static int clk_composite_set_parent(struct clk *clk, u8 index)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *mux_clk = composite->mux_clk;
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return mux_clk ? mux_clk->ops->set_parent(mux_clk, index) : 0;
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}
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static unsigned long clk_composite_recalc_rate(struct clk *clk,
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unsigned long parent_rate)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *rate_clk = composite->rate_clk;
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return rate_clk ? rate_clk->ops->recalc_rate(rate_clk, parent_rate) : 0;
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}
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static long clk_composite_round_rate(struct clk *clk, unsigned long rate,
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unsigned long *prate)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *rate_clk = composite->rate_clk;
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return rate_clk ? rate_clk->ops->round_rate(rate_clk, rate, prate) : 0;
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}
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static int clk_composite_set_rate(struct clk *clk, unsigned long rate,
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unsigned long parent_rate)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *rate_clk = composite->rate_clk;
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return rate_clk ?
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rate_clk->ops->set_rate(rate_clk, rate, parent_rate) : 0;
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}
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static int clk_composite_is_enabled(struct clk *clk)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *gate_clk = composite->gate_clk;
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return gate_clk ? gate_clk->ops->is_enabled(gate_clk) : 0;
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}
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static int clk_composite_enable(struct clk *clk)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *gate_clk = composite->gate_clk;
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return gate_clk ? gate_clk->ops->enable(gate_clk) : 0;
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}
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static void clk_composite_disable(struct clk *clk)
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{
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struct clk_composite *composite = to_clk_composite(clk);
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struct clk *gate_clk = composite->gate_clk;
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if (gate_clk)
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gate_clk->ops->disable(gate_clk);
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}
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static struct clk_ops clk_composite_ops = {
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.get_parent = clk_composite_get_parent,
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.set_parent = clk_composite_set_parent,
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.recalc_rate = clk_composite_recalc_rate,
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.round_rate = clk_composite_round_rate,
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.set_rate = clk_composite_set_rate,
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.is_enabled = clk_composite_is_enabled,
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.enable = clk_composite_enable,
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.disable = clk_composite_disable,
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};
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struct clk *clk_register_composite(const char *name,
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const char **parent_names, int num_parents,
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struct clk *mux_clk,
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struct clk *rate_clk,
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struct clk *gate_clk,
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unsigned long flags)
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{
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struct clk_composite *composite;
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int ret;
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composite = xzalloc(sizeof(*composite));
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composite->clk.name = name;
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composite->clk.ops = &clk_composite_ops;
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composite->clk.flags = flags;
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composite->clk.parent_names = parent_names;
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composite->clk.num_parents = num_parents;
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composite->mux_clk = mux_clk;
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composite->rate_clk = rate_clk;
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composite->gate_clk = gate_clk;
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ret = clk_register(&composite->clk);
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if (ret)
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goto err;
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return &composite->clk;
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err:
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kfree(composite);
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return 0;
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}
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