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/*
* drivers/clk/at91/clk-slow.c
*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*
* 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.
*
*/
#include <common.h>
#include <clock.h>
#include <of.h>
#include <io.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/clk/at91_pmc.h>
#include <mfd/syscon.h>
#include <regmap.h>
#include "pmc.h"
struct clk_sam9260_slow {
struct clk clk;
struct regmap *regmap;
const char *parent_names[2];
};
#define to_clk_sam9260_slow(clk) container_of(clk, struct clk_sam9260_slow, clk)
static int clk_sam9260_slow_get_parent(struct clk *clk)
{
struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(clk);
unsigned int status;
regmap_read(slowck->regmap, AT91_PMC_SR, &status);
return status & AT91_PMC_OSCSEL ? 1 : 0;
}
static const struct clk_ops sam9260_slow_ops = {
.get_parent = clk_sam9260_slow_get_parent,
};
static struct clk * __init
at91_clk_register_sam9260_slow(struct regmap *regmap,
const char *name,
const char **parent_names,
int num_parents)
{
struct clk_sam9260_slow *slowck;
int ret;
if (!name)
return ERR_PTR(-EINVAL);
if (!parent_names || !num_parents)
return ERR_PTR(-EINVAL);
slowck = xzalloc(sizeof(*slowck));
slowck->clk.name = name;
slowck->clk.ops = &sam9260_slow_ops;
memcpy(slowck->parent_names, parent_names,
num_parents * sizeof(slowck->parent_names[0]));
slowck->clk.parent_names = slowck->parent_names;
slowck->clk.num_parents = num_parents;
slowck->regmap = regmap;
ret = clk_register(&slowck->clk);
if (ret) {
kfree(slowck);
return ERR_PTR(ret);
}
return &slowck->clk;
}
static int of_at91sam9260_clk_slow_setup(struct device_node *np)
{
struct clk *clk;
const char *parent_names[2];
unsigned int num_parents;
const char *name = np->name;
struct regmap *regmap;
num_parents = of_clk_get_parent_count(np);
if (num_parents != 2)
return -EINVAL;
of_clk_parent_fill(np, parent_names, num_parents);
regmap = syscon_node_to_regmap(of_get_parent(np));
if (IS_ERR(regmap))
return PTR_ERR(regmap);
of_property_read_string(np, "clock-output-names", &name);
clk = at91_clk_register_sam9260_slow(regmap, name, parent_names,
num_parents);
if (IS_ERR(clk))
return PTR_ERR(clk);
return of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
CLK_OF_DECLARE(at91sam9260_clk_slow, "atmel,at91sam9260-clk-slow",
of_at91sam9260_clk_slow_setup);
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