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         u8                      new_parent_index;
  37         unsigned long           rate;
  38         unsigned long           new_rate;
  39         struct clk              *new_parent;
  40         struct clk              *new_child;
  41         unsigned long           flags;
  42         unsigned int            enable_count;
  43         unsigned int            prepare_count;
  44         struct hlist_head       children;
  45         struct hlist_node       child_node;
  46         unsigned int            notifier_count;
  47
  48         void                    *private_data;
  49 #ifdef CONFIG_COMMON_CLK_DEBUG
  50         struct dentry           *dentry;
  51 #endif
  52 };
  53
  54 /*
  55  * DOC: Basic clock implementations common to many platforms
  56  *
  57  * Each basic clock hardware type is comprised of a structure describing the
  58  * clock hardware, implementations of the relevant callbacks in struct clk_ops,
  59  * unique flags for that hardware type, a registration function and an
  60  * alternative macro for static initialization
  61  */
  62
  63 #define DEFINE_CLK(_name, _ops, _flags, _parent_names,          \
  64                 _parents)                                       \
  65         static struct clk _name = {                             \
  66                 .name = #_name,                                 \
  67                 .ops = &_ops,                                   \
  68                 .hw = &_name##_hw.hw,                           \
  69                 .parent_names = _parent_names,                  \
  70                 .num_parents = ARRAY_SIZE(_parent_names),       \
  71                 .parents = _parents,                            \
  72                 .flags = _flags | CLK_IS_BASIC,                 \
  73         }
  74
  75 #define DEFINE_CLK_FIXED_RATE(_name, _flags, _rate,             \
  76                                 _fixed_rate_flags)              \
  77         static struct clk _name;                                \
  78         static const char *_name##_parent_names[] = {};         \
  79         static struct clk_fixed_rate _name##_hw = {             \
  80                 .hw = {                                         \
  81                         .clk = &_name,                          \
  82                 },                                              \
  83                 .fixed_rate = _rate,                            \
  84                 .flags = _fixed_rate_flags,                     \
  85         };                                                      \
  86         DEFINE_CLK(_name, clk_fixed_rate_ops, _flags,           \
  87                         _name##_parent_names, NULL);
  88
  89 #define DEFINE_CLK_GATE(_name, _parent_name, _parent_ptr,       \
  90                                 _flags, _reg, _bit_idx,         \
  91                                 _gate_flags, _lock)             \
  92         static struct clk _name;                                \
  93         static const char *_name##_parent_names[] = {           \
  94                 _parent_name,                                   \
  95         };                                                      \
  96         static struct clk *_name##_parents[] = {                \
  97                 _parent_ptr,                                    \
  98         };                                                      \
  99         static struct clk_gate _name##_hw = {                   \
 100                 .hw = {                                         \
 101                         .clk = &_name,                          \
 102                 },                                              \
 103                 .reg = _reg,                                    \
 104                 .bit_idx = _bit_idx,                            \
 105                 .flags = _gate_flags,                           \
 106                 .lock = _lock,                                  \
 107         };                                                      \
 108         DEFINE_CLK(_name, clk_gate_ops, _flags,                 \
 109                         _name##_parent_names, _name##_parents);
 110
 111 #define _DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr,   \
 112                                 _flags, _reg, _shift, _width,   \
 113                                 _divider_flags, _table, _lock)  \
 114         static struct clk _name;                                \
 115         static const char *_name##_parent_names[] = {           \
 116                 _parent_name,                                   \
 117         };                                                      \
 118         static struct clk *_name##_parents[] = {                \
 119                 _parent_ptr,                                    \
 120         };                                                      \
 121         static struct clk_divider _name##_hw = {                \
 122                 .hw = {                                         \
 123                         .clk = &_name,                          \
 124                 },                                              \
 125                 .reg = _reg,                                    \
 126                 .shift = _shift,                                \
 127                 .width = _width,                                \
 128                 .flags = _divider_flags,                        \
 129                 .table = _table,                                \
 130                 .lock = _lock,                                  \
 131         };                                                      \
 132         DEFINE_CLK(_name, clk_divider_ops, _flags,              \
 133                         _name##_parent_names, _name##_parents);
 134
 135 #define DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr,    \
 136                                 _flags, _reg, _shift, _width,   \
 137                                 _divider_flags, _lock)          \
 138         _DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr,   \
 139                                 _flags, _reg, _shift, _width,   \
 140                                 _divider_flags, NULL, _lock)
 141
 142 #define DEFINE_CLK_DIVIDER_TABLE(_name, _parent_name,           \
 143                                 _parent_ptr, _flags, _reg,      \
 144                                 _shift, _width, _divider_flags, \
 145                                 _table, _lock)                  \
 146         _DEFINE_CLK_DIVIDER(_name, _parent_name, _parent_ptr,   \
 147                                 _flags, _reg, _shift, _width,   \
 148                                 _divider_flags, _table, _lock)  \
 149
 150 #define DEFINE_CLK_MUX(_name, _parent_names, _parents, _flags,  \
 151                                 _reg, _shift, _width,           \
 152                                 _mux_flags, _lock)              \
 153         static struct clk _name;                                \
 154         static struct clk_mux _name##_hw = {                    \
 155                 .hw = {                                         \
 156                         .clk = &_name,                          \
 157                 },                                              \
 158                 .reg = _reg,                                    \
 159                 .shift = _shift,                                \
 160                 .mask = BIT(_width) - 1,                        \
 161                 .flags = _mux_flags,                            \
 162                 .lock = _lock,                                  \
 163         };                                                      \
 164         DEFINE_CLK(_name, clk_mux_ops, _flags, _parent_names,   \
 165                         _parents);
 166
 167 #define DEFINE_CLK_FIXED_FACTOR(_name, _parent_name,            \
 168                                 _parent_ptr, _flags,            \
 169                                 _mult, _div)                    \
 170         static struct clk _name;                                \
 171         static const char *_name##_parent_names[] = {           \
 172                 _parent_name,                                   \
 173         };                                                      \
 174         static struct clk *_name##_parents[] = {                \
 175                 _parent_ptr,                                    \
 176         };                                                      \
 177         static struct clk_fixed_factor _name##_hw = {           \
 178                 .hw = {                                         \
 179                         .clk = &_name,                          \
 180                 },                                              \
 181                 .mult = _mult,                                  \
 182                 .div = _div,                                    \
 183         };                                                      \
 184         DEFINE_CLK(_name, clk_fixed_factor_ops, _flags,         \
 185                         _name##_parent_names, _name##_parents);
 186
 187 /**
 188  * __clk_init - initialize the data structures in a struct clk
 189  * @dev:        device initializing this clk, placeholder for now
 190  * @clk:        clk being initialized
 191  *
 192  * Initializes the lists in struct clk, queries the hardware for the
 193  * parent and rate and sets them both.
 194  *
 195  * Any struct clk passed into __clk_init must have the following members
 196  * populated:
 197  *      .name
 198  *      .ops
 199  *      .hw
 200  *      .parent_names
 201  *      .num_parents
 202  *      .flags
 203  *
 204  * It is not necessary to call clk_register if __clk_init is used directly with
 205  * statically initialized clock data.
 206  *
 207  * Returns 0 on success, otherwise an error code.
 208  */
 209 int __clk_init(struct device *dev, struct clk *clk);
 210
 211 struct clk *__clk_register(struct device *dev, struct clk_hw *hw);
 212
 213 #endif /* CONFIG_COMMON_CLK */
 214 #endif /* CLK_PRIVATE_H */