115 lines
3 KiB
C
115 lines
3 KiB
C
/*
|
|
* Copyright (C) 2016 Socionext Inc.
|
|
* Author: Masahiro Yamada <yamada.masahiro@socionext.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.
|
|
*
|
|
* 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 <linux/clk-provider.h>
|
|
#include <linux/device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "clk-uniphier.h"
|
|
|
|
#define UNIPHIER_CLK_CPUGEAR_STAT 0 /* status */
|
|
#define UNIPHIER_CLK_CPUGEAR_SET 4 /* set */
|
|
#define UNIPHIER_CLK_CPUGEAR_UPD 8 /* update */
|
|
#define UNIPHIER_CLK_CPUGEAR_UPD_BIT BIT(0)
|
|
|
|
struct uniphier_clk_cpugear {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
unsigned int regbase;
|
|
unsigned int mask;
|
|
};
|
|
|
|
#define to_uniphier_clk_cpugear(_hw) \
|
|
container_of(_hw, struct uniphier_clk_cpugear, hw)
|
|
|
|
static int uniphier_clk_cpugear_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
|
|
int ret;
|
|
unsigned int val;
|
|
|
|
ret = regmap_write_bits(gear->regmap,
|
|
gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
|
|
gear->mask, index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_write_bits(gear->regmap,
|
|
gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD,
|
|
UNIPHIER_CLK_CPUGEAR_UPD_BIT,
|
|
UNIPHIER_CLK_CPUGEAR_UPD_BIT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return regmap_read_poll_timeout(gear->regmap,
|
|
gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD,
|
|
val, !(val & UNIPHIER_CLK_CPUGEAR_UPD_BIT),
|
|
0, 1);
|
|
}
|
|
|
|
static u8 uniphier_clk_cpugear_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
|
|
int num_parents = clk_hw_get_num_parents(hw);
|
|
int ret;
|
|
unsigned int val;
|
|
|
|
ret = regmap_read(gear->regmap,
|
|
gear->regbase + UNIPHIER_CLK_CPUGEAR_STAT, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= gear->mask;
|
|
|
|
return val < num_parents ? val : -EINVAL;
|
|
}
|
|
|
|
static const struct clk_ops uniphier_clk_cpugear_ops = {
|
|
.determine_rate = __clk_mux_determine_rate,
|
|
.set_parent = uniphier_clk_cpugear_set_parent,
|
|
.get_parent = uniphier_clk_cpugear_get_parent,
|
|
};
|
|
|
|
struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
|
|
struct regmap *regmap,
|
|
const char *name,
|
|
const struct uniphier_clk_cpugear_data *data)
|
|
{
|
|
struct uniphier_clk_cpugear *gear;
|
|
struct clk_init_data init = {};
|
|
int ret;
|
|
|
|
gear = devm_kzalloc(dev, sizeof(*gear), GFP_KERNEL);
|
|
if (!gear)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &uniphier_clk_cpugear_ops;
|
|
init.flags = CLK_SET_RATE_PARENT;
|
|
init.parent_names = data->parent_names;
|
|
init.num_parents = data->num_parents,
|
|
|
|
gear->regmap = regmap;
|
|
gear->regbase = data->regbase;
|
|
gear->mask = data->mask;
|
|
gear->hw.init = &init;
|
|
|
|
ret = devm_clk_hw_register(dev, &gear->hw);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return &gear->hw;
|
|
}
|