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/*
* clk-mux.c - generic barebox clock support. Based on Linux clk support
*
* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that 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.
*
*/
#include <common.h>
#include <io.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
struct clk_mux {
struct clk clk;
void __iomem *reg;
int shift;
int width;
};
static int clk_mux_get_parent(struct clk *clk)
{
struct clk_mux *m = container_of(clk, struct clk_mux, clk);
int idx = readl(m->reg) >> m->shift & ((1 << m->width) - 1);
return idx;
}
static int clk_mux_set_parent(struct clk *clk, u8 idx)
{
struct clk_mux *m = container_of(clk, struct clk_mux, clk);
u32 val;
val = readl(m->reg);
val &= ~(((1 << m->width) - 1) << m->shift);
val |= idx << m->shift;
writel(val, m->reg);
return 0;
}
struct clk_ops clk_mux_ops = {
.get_parent = clk_mux_get_parent,
.set_parent = clk_mux_set_parent,
};
struct clk *clk_mux(const char *name, void __iomem *reg,
u8 shift, u8 width, const char **parents, u8 num_parents)
{
struct clk_mux *m = xzalloc(sizeof(*m));
int ret;
m->reg = reg;
m->shift = shift;
m->width = width;
m->clk.ops = &clk_mux_ops;
m->clk.name = name;
m->clk.parent_names = parents;
m->clk.num_parents = num_parents;
ret = clk_register(&m->clk);
if (ret) {
free(m);
return ERR_PTR(ret);
}
return &m->clk;
}
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