linux/drivers/clk/uniphier/clk-uniphier-cpugear.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

106 lines
2.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#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;
}