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/*
* 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 <linux/list.h>
#include <linux/clk.h>
#include <linux/clk/at91_pmc.h>
#include <mfd/syscon.h>
#include <regmap.h>
#include "pmc.h"
#define UTMI_FIXED_MUL 40
struct clk_utmi {
struct clk clk;
struct regmap *regmap;
const char *parent;
};
#define to_clk_utmi(clk) container_of(clk, struct clk_utmi, clk)
static inline bool clk_utmi_ready(struct regmap *regmap)
{
unsigned int status;
regmap_read(regmap, AT91_PMC_SR, &status);
return status & AT91_PMC_LOCKU;
}
static int clk_utmi_enable(struct clk *clk)
{
struct clk_utmi *utmi = to_clk_utmi(clk);
unsigned int uckr = AT91_PMC_UPLLEN | AT91_PMC_UPLLCOUNT |
AT91_PMC_BIASEN;
regmap_write_bits(utmi->regmap, AT91_CKGR_UCKR, uckr, uckr);
while (!clk_utmi_ready(utmi->regmap))
barrier();
return 0;
}
static int clk_utmi_is_enabled(struct clk *clk)
{
struct clk_utmi *utmi = to_clk_utmi(clk);
return clk_utmi_ready(utmi->regmap);
}
static void clk_utmi_disable(struct clk *clk)
{
struct clk_utmi *utmi = to_clk_utmi(clk);
regmap_write_bits(utmi->regmap, AT91_CKGR_UCKR, AT91_PMC_UPLLEN, 0);
}
static unsigned long clk_utmi_recalc_rate(struct clk *clk,
unsigned long parent_rate)
{
/* UTMI clk is a fixed clk multiplier */
return parent_rate * UTMI_FIXED_MUL;
}
static const struct clk_ops utmi_ops = {
.enable = clk_utmi_enable,
.disable = clk_utmi_disable,
.is_enabled = clk_utmi_is_enabled,
.recalc_rate = clk_utmi_recalc_rate,
};
static struct clk * __init
at91_clk_register_utmi(struct regmap *regmap,
const char *name, const char *parent_name)
{
int ret;
struct clk_utmi *utmi;
utmi = xzalloc(sizeof(*utmi));
utmi->clk.name = name;
utmi->clk.ops = &utmi_ops;
if (parent_name) {
utmi->parent = parent_name;
utmi->clk.parent_names = &utmi->parent;
utmi->clk.num_parents = 1;
}
/* utmi->clk.flags = CLK_SET_RATE_GATE; */
utmi->regmap = regmap;
ret = clk_register(&utmi->clk);
if (ret) {
kfree(utmi);
return ERR_PTR(ret);
}
return &utmi->clk;
}
#if defined(CONFIG_OFTREE) && defined(CONFIG_COMMON_CLK_OF_PROVIDER)
static void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np)
{
struct clk *clk;
const char *parent_name;
const char *name = np->name;
struct regmap *regmap;
parent_name = of_clk_get_parent_name(np, 0);
of_property_read_string(np, "clock-output-names", &name);
regmap = syscon_node_to_regmap(of_get_parent(np));
if (IS_ERR(regmap))
return;
clk = at91_clk_register_utmi(regmap, name, parent_name);
if (IS_ERR(clk))
return;
of_clk_add_provider(np, of_clk_src_simple_get, clk);
return;
}
CLK_OF_DECLARE(at91sam9x5_clk_utmi, "atmel,at91sam9x5-clk-utmi",
of_at91sam9x5_clk_utmi_setup);
#endif
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