include/linux/clk-private.h

   1 /*
   2  *  linux/include/linux/clk-private.h
   3  *
   4  *  Copyright (c) 2010-2011 Jeremy Kerr <jeremy.kerr@canonical.com>
   5  *  Copyright (C) 2011-2012 Linaro Ltd <mturquette@linaro.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __LINUX_CLK_PRIVATE_H
  12 #define __LINUX_CLK_PRIVATE_H
  13
  14 #include <linux/clk-provider.h>
  15 #include <linux/list.h>
  16
  17 /*
  18  * WARNING: Do not include clk-private.h from any file that implements struct
  19  * clk_ops.  Doing so is a layering violation!
  20  *
  21  * This header exists only to allow for statically initialized clock data.  Any
  22  * static clock data must be defined in a separate file from the logic that
  23  * implements the clock operations for that same data.
  24  */
  25
  26 #ifdef CONFIG_COMMON_CLK
  27
  28 struct clk {
  29         const char              *name;
  30         const struct clk_ops    *ops;
  31         struct clk_hw           *hw;
  32         struct clk              *parent;
  33         const char              **parent_names;
  34         struct clk              **parents;
  35         u8                      num_parents;
  36         unsigned long           rate;
  37         unsigned long           new_rate;
  38         unsigned long           flags;
  39         unsigned int            enable_count;
  40         unsigned int            prepare_count;
  41         struct hlist_head       children;
  42         struct hlist_node       child_node;
  43         unsigned int            notifier_count;
  44 #ifdef CONFIG_COMMON_CLK_DEBUG
  45         struct dentry           *dentry;
  46 #endif
  47 };
  48
  49 /*
  50  * DOC: Basic clock implementations common to many platforms
  51  *
  52  * Each basic clock hardware type is comprised of a structure describing the
  53  * clock hardware, implementations of the relevant callbacks in struct clk_ops,
  54  * unique flags for that hardware type, a registration function and an
  55  * alternative macro for static initialization
  56  */
  57
  58 #define DEFINE_CLK(_name, _ops, _flags, _parent_names,          \
  59                 _parents)                                       \
  60         static struct clk _name = {                             \
  61                 .name = #_name,                                 \
  62                 .ops = &_ops,                                   \
  63                 .hw = &_name##_hw.hw,                           \
  64                 .parent_names = _parent_names,                  \
  65                 .num_parents = ARRAY_SIZE(_parent_names),       \
  66                 .parents = _parents,                            \
  67                 .flags = _flags,                                \
  68         }
  69
  70 #define DEFINE_CLK_FIXED_RATE(_name, _flags, _rate,             \
  71                                 _fixed_rate_flags)              \
  72         static struct clk _name;                                \
  73         static const char *_name##_parent_names[] = {};         \
  74         static struct clk_fixed_rate _name##_hw = {             \
  75                 .hw = {                                         \
  76                         .clk = &_name,                          \
  77                 },                                              \
  78                 .fixed_rate = _rate,                            \
  79                 .flags = _fixed_rate_flags,                     \
  80         };                                                      \
  81         DEFINE_CLK(_name, clk_fixed_rate_ops, _flags,           \
  82                         _name##_parent_names, NULL);
  83
  84 #define DEFINE_CLK_GATE(_name, _parent_name, _parent_ptr,       \
  85                                 _flags, _reg, _bit_idx,         \
  86                                 _gate_flags, _lock)             \
  87         static struct clk _name;                                \
  88         static const char *_name##_parent_names[] = {           \
  89                 _parent_name,                                   \
  90         };                                                      \
  91         static struct clk *_name##_parents[] = {                \
  92                 _parent_ptr,                                    \
  93         };                                                      \
  94         static struct clk_gate _name##_hw = {                   \
  95                 .hw = {                                         \
  96                         .clk = &_name,                          \
  97                 },                                              \
  98                 .reg = _reg,                                    \
  99                 .bit_idx = _bit_idx,                            \
 100                 .flags = _gate_flags,                           \
 101                 .lock = _lock,                                  \
 102         };                                                      \
 103         DEFINE_CLK(_name, clk_gate_ops, _flags,                 \
 104                         _name##_parent_names, _name##_parents);
 105
 106 #define DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr,    \
 107                                 _flags, _reg, _shift, _width,   \
 108                                 _divider_flags, _lock)          \
 109         static struct clk _name;                                \
 110         static const char *_name##_parent_names[] = {           \
 111                 _parent_name,                                   \
 112         };                                                      \
 113         static struct clk *_name##_parents[] = {                \
 114                 _parent_ptr,                                    \
 115         };                                                      \
 116         static struct clk_divider _name##_hw = {                \
 117                 .hw = {                                         \
 118                         .clk = &_name,                          \
 119                 },                                              \
 120                 .reg = _reg,                                    \
 121                 .shift = _shift,                                \
 122                 .width = _width,                                \
 123                 .flags = _divider_flags,                        \
 124                 .lock = _lock,                                  \
 125         };                                                      \
 126         DEFINE_CLK(_name, clk_divider_ops, _flags,              \
 127                         _name##_parent_names, _name##_parents);
 128
 129 #define DEFINE_CLK_MUX(_name, _parent_names, _parents, _flags,  \
 130                                 _reg, _shift, _width,           \
 131                                 _mux_flags, _lock)              \
 132         static struct clk _name;                                \
 133         static struct clk_mux _name##_hw = {                    \
 134                 .hw = {                                         \
 135                         .clk = &_name,                          \
 136                 },                                              \
 137                 .reg = _reg,                                    \
 138                 .shift = _shift,                                \
 139                 .width = _width,                                \
 140                 .flags = _mux_flags,                            \
 141                 .lock = _lock,                                  \
 142         };                                                      \
 143         DEFINE_CLK(_name, clk_mux_ops, _flags, _parent_names,   \
 144                         _parents);
 145
 146 #define DEFINE_CLK_FIXED_FACTOR(_name, _parent_name,            \
 147                                 _parent_ptr, _flags,            \
 148                                 _mult, _div)                    \
 149         static struct clk _name;                                \
 150         static const char *_name##_parent_names[] = {           \
 151                 _parent_name,                                   \
 152         };                                                      \
 153         static struct clk *_name##_parents[] = {                \
 154                 _parent_ptr,                                    \
 155         };                                                      \
 156         static struct clk_fixed_factor _name##_hw = {           \
 157                 .hw = {                                         \
 158                         .clk = &_name,                          \
 159                 },                                              \
 160                 .mult = _mult,                                  \
 161                 .div = _div,                                    \
 162         };                                                      \
 163         DEFINE_CLK(_name, clk_fixed_factor_ops, _flags,         \
 164                         _name##_parent_names, _name##_parents);
 165
 166 /**
 167  * __clk_init - initialize the data structures in a struct clk
 168  * @dev:        device initializing this clk, placeholder for now
 169  * @clk:        clk being initialized
 170  *
 171  * Initializes the lists in struct clk, queries the hardware for the
 172  * parent and rate and sets them both.
 173  *
 174  * Any struct clk passed into __clk_init must have the following members
 175  * populated:
 176  *      .name
 177  *      .ops
 178  *      .hw
 179  *      .parent_names
 180  *      .num_parents
 181  *      .flags
 182  *
 183  * It is not necessary to call clk_register if __clk_init is used directly with
 184  * statically initialized clock data.
 185  *
 186  * Returns 0 on success, otherwise an error code.
 187  */
 188 int __clk_init(struct device *dev, struct clk *clk);
 189
 190 struct clk *__clk_register(struct device *dev, struct clk_hw *hw);
 191
 192 #endif /* CONFIG_COMMON_CLK */
 193 #endif /* CLK_PRIVATE_H */