mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-21 18:14:48 +08:00
f5644f10dc
Now that we have clk_hw based provider APIs to register clks, we can get rid of struct clk pointers in this driver, allowing us to move closer to a clear split of consumer and provider clk APIs. Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
136 lines
3.0 KiB
C
136 lines
3.0 KiB
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 <linux/clk-provider.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/clk/at91_pmc.h>
|
|
#include <linux/of.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "pmc.h"
|
|
|
|
#define UTMI_FIXED_MUL 40
|
|
|
|
struct clk_utmi {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
|
|
|
|
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_prepare(struct clk_hw *hw)
|
|
{
|
|
struct clk_utmi *utmi = to_clk_utmi(hw);
|
|
unsigned int uckr = AT91_PMC_UPLLEN | AT91_PMC_UPLLCOUNT |
|
|
AT91_PMC_BIASEN;
|
|
|
|
regmap_update_bits(utmi->regmap, AT91_CKGR_UCKR, uckr, uckr);
|
|
|
|
while (!clk_utmi_ready(utmi->regmap))
|
|
cpu_relax();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int clk_utmi_is_prepared(struct clk_hw *hw)
|
|
{
|
|
struct clk_utmi *utmi = to_clk_utmi(hw);
|
|
|
|
return clk_utmi_ready(utmi->regmap);
|
|
}
|
|
|
|
static void clk_utmi_unprepare(struct clk_hw *hw)
|
|
{
|
|
struct clk_utmi *utmi = to_clk_utmi(hw);
|
|
|
|
regmap_update_bits(utmi->regmap, AT91_CKGR_UCKR, AT91_PMC_UPLLEN, 0);
|
|
}
|
|
|
|
static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
/* UTMI clk is a fixed clk multiplier */
|
|
return parent_rate * UTMI_FIXED_MUL;
|
|
}
|
|
|
|
static const struct clk_ops utmi_ops = {
|
|
.prepare = clk_utmi_prepare,
|
|
.unprepare = clk_utmi_unprepare,
|
|
.is_prepared = clk_utmi_is_prepared,
|
|
.recalc_rate = clk_utmi_recalc_rate,
|
|
};
|
|
|
|
static struct clk_hw * __init
|
|
at91_clk_register_utmi(struct regmap *regmap,
|
|
const char *name, const char *parent_name)
|
|
{
|
|
struct clk_utmi *utmi;
|
|
struct clk_hw *hw;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
|
|
utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);
|
|
if (!utmi)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &utmi_ops;
|
|
init.parent_names = parent_name ? &parent_name : NULL;
|
|
init.num_parents = parent_name ? 1 : 0;
|
|
init.flags = CLK_SET_RATE_GATE;
|
|
|
|
utmi->hw.init = &init;
|
|
utmi->regmap = regmap;
|
|
|
|
hw = &utmi->hw;
|
|
ret = clk_hw_register(NULL, &utmi->hw);
|
|
if (ret) {
|
|
kfree(utmi);
|
|
hw = ERR_PTR(ret);
|
|
}
|
|
|
|
return hw;
|
|
}
|
|
|
|
static void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np)
|
|
{
|
|
struct clk_hw *hw;
|
|
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;
|
|
|
|
hw = at91_clk_register_utmi(regmap, name, parent_name);
|
|
if (IS_ERR(hw))
|
|
return;
|
|
|
|
of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
|
|
return;
|
|
}
|
|
CLK_OF_DECLARE(at91sam9x5_clk_utmi, "atmel,at91sam9x5-clk-utmi",
|
|
of_at91sam9x5_clk_utmi_setup);
|