f2e2e596a2
This adds barebox common clk support loosely based on the Kernel common clk support. differences are: - barebox does not need prepare/unprepare - no parent rate propagation for set_rate - struct clk is not really encapsulated from the drivers Along with the clk support we have support for some basic clk building blocks: - clk-fixed - clk-fixed-factor - clk-mux - clk-divider clk-fixed and clk-fixed-factor are completely generic, clk-mux and clk-divider are currently the way i.MX muxes/dividers are implemented. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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* clk-fixed-factor.c - generic barebox clock support. Based on Linux clk support
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*
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* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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_fixed_factor {
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struct clk clk;
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int mult;
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int div;
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const char *parent;
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};
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static unsigned long clk_fixed_factor_recalc_rate(struct clk *clk,
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unsigned long parent_rate)
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{
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struct clk_fixed_factor *f = container_of(clk, struct clk_fixed_factor, clk);
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return (parent_rate / f->div) * f->mult;
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}
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struct clk_ops clk_fixed_factor_ops = {
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.recalc_rate = clk_fixed_factor_recalc_rate,
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};
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struct clk *clk_fixed_factor(const char *name,
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const char *parent, unsigned int mult, unsigned int div)
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{
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struct clk_fixed_factor *f = xzalloc(sizeof(*f));
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int ret;
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f->mult = mult;
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f->div = div;
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f->parent = parent;
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f->clk.ops = &clk_fixed_factor_ops;
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f->clk.name = name;
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f->clk.parent_names = &f->parent;
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f->clk.num_parents = 1;
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ret = clk_register(&f->clk);
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if (ret) {
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free(f);
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return ERR_PTR(ret);
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}
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return &f->clk;
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}
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