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/*
* linux/include/linux/clk-private.h
*
* Copyright (c) 2010-2011 Jeremy Kerr <jeremy.kerr@canonical.com>
* Copyright (C) 2011-2012 Linaro Ltd <mturquette@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __LINUX_CLK_PRIVATE_H
#define __LINUX_CLK_PRIVATE_H
#include <linux/clk-provider.h>
#include <linux/list.h>
/*
* WARNING: Do not include clk-private.h from any file that implements struct
* clk_ops. Doing so is a layering violation!
*
* This header exists only to allow for statically initialized clock data. Any
* static clock data must be defined in a separate file from the logic that
* implements the clock operations for that same data.
*/
#ifdef CONFIG_COMMON_CLK
struct clk {
const char *name;
const struct clk_ops *ops;
struct clk_hw *hw;
struct clk *parent;
const char **parent_names;
struct clk **parents;
u8 num_parents;
u8 new_parent_index;
unsigned long rate;
unsigned long new_rate;
struct clk *new_parent;
struct clk *new_child;
unsigned long flags;
unsigned int enable_count;
unsigned int prepare_count;
struct hlist_head children;
struct hlist_node child_node;
unsigned int notifier_count;
#ifdef CONFIG_COMMON_CLK_DEBUG
struct dentry *dentry;
#endif
};
/*
* DOC: Basic clock implementations common to many platforms
*
* Each basic clock hardware type is comprised of a structure describing the
* clock hardware, implementations of the relevant callbacks in struct clk_ops,
* unique flags for that hardware type, a registration function and an
* alternative macro for static initialization
*/
#define DEFINE_CLK(_name, _ops, _flags, _parent_names, \
_parents) \
static struct clk _name = { \
.name = #_name, \
.ops = &_ops, \
.hw = &_name##_hw.hw, \
.parent_names = _parent_names, \
.num_parents = ARRAY_SIZE(_parent_names), \
.parents = _parents, \
.flags = _flags | CLK_IS_BASIC, \
}
#define DEFINE_CLK_FIXED_RATE(_name, _flags, _rate, \
_fixed_rate_flags) \
static struct clk _name; \
static const char *_name##_parent_names[] = {}; \
static struct clk_fixed_rate _name##_hw = { \
.hw = { \
.clk = &_name, \
}, \
.fixed_rate = _rate, \
.flags = _fixed_rate_flags, \
}; \
DEFINE_CLK(_name, clk_fixed_rate_ops, _flags, \
_name##_parent_names, NULL);
#define DEFINE_CLK_GATE(_name, _parent_name, _parent_ptr, \
_flags, _reg, _bit_idx, \
_gate_flags, _lock) \
static struct clk _name; \
static const char *_name##_parent_names[] = { \
_parent_name, \
}; \
static struct clk *_name##_parents[] = { \
_parent_ptr, \
}; \
static struct clk_gate _name##_hw = { \
.hw = { \
.clk = &_name, \
}, \
.reg = _reg, \
.bit_idx = _bit_idx, \
.flags = _gate_flags, \
.lock = _lock, \
}; \
DEFINE_CLK(_name, clk_gate_ops, _flags, \
_name##_parent_names, _name##_parents);
#define _DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr, \
_flags, _reg, _shift, _width, \
_divider_flags, _table, _lock) \
static struct clk _name; \
static const char *_name##_parent_names[] = { \
_parent_name, \
}; \
static struct clk *_name##_parents[] = { \
_parent_ptr, \
}; \
static struct clk_divider _name##_hw = { \
.hw = { \
.clk = &_name, \
}, \
.reg = _reg, \
.shift = _shift, \
.width = _width, \
.flags = _divider_flags, \
.table = _table, \
.lock = _lock, \
}; \
DEFINE_CLK(_name, clk_divider_ops, _flags, \
_name##_parent_names, _name##_parents);
#define DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr, \
_flags, _reg, _shift, _width, \
_divider_flags, _lock) \
_DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr, \
_flags, _reg, _shift, _width, \
_divider_flags, NULL, _lock)
#define DEFINE_CLK_DIVIDER_TABLE(_name, _parent_name, \
_parent_ptr, _flags, _reg, \
_shift, _width, _divider_flags, \
_table, _lock) \
_DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr, \
_flags, _reg, _shift, _width, \
_divider_flags, _table, _lock) \
#define DEFINE_CLK_MUX(_name, _parent_names, _parents, _flags, \
_reg, _shift, _width, \
_mux_flags, _lock) \
static struct clk _name; \
static struct clk_mux _name##_hw = { \
.hw = { \
.clk = &_name, \
}, \
.reg = _reg, \
.shift = _shift, \
.mask = BIT(_width) - 1, \
.flags = _mux_flags, \
.lock = _lock, \
}; \
DEFINE_CLK(_name, clk_mux_ops, _flags, _parent_names, \
_parents);
#define DEFINE_CLK_FIXED_FACTOR(_name, _parent_name, \
_parent_ptr, _flags, \
_mult, _div) \
static struct clk _name; \
static const char *_name##_parent_names[] = { \
_parent_name, \
}; \
static struct clk *_name##_parents[] = { \
_parent_ptr, \
}; \
static struct clk_fixed_factor _name##_hw = { \
.hw = { \
.clk = &_name, \
}, \
.mult = _mult, \
.div = _div, \
}; \
DEFINE_CLK(_name, clk_fixed_factor_ops, _flags, \
_name##_parent_names, _name##_parents);
/**
* __clk_init - initialize the data structures in a struct clk
* @dev: device initializing this clk, placeholder for now
* @clk: clk being initialized
*
* Initializes the lists in struct clk, queries the hardware for the
* parent and rate and sets them both.
*
* Any struct clk passed into __clk_init must have the following members
* populated:
* .name
* .ops
* .hw
* .parent_names
* .num_parents
* .flags
*
* It is not necessary to call clk_register if __clk_init is used directly with
* statically initialized clock data.
*
* Returns 0 on success, otherwise an error code.
*/
int __clk_init(struct device *dev, struct clk *clk);
struct clk *__clk_register(struct device *dev, struct clk_hw *hw);
#endif /* CONFIG_COMMON_CLK */
#endif /* CLK_PRIVATE_H */
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