drivers/base/regmap/internal.h

   1 /*
   2  * Register map access API internal header
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef _REGMAP_INTERNAL_H
  14 #define _REGMAP_INTERNAL_H
  15
  16 #include <linux/regmap.h>
  17 #include <linux/fs.h>
  18 #include <linux/list.h>
  19
  20 struct regmap;
  21 struct regcache_ops;
  22
  23 struct regmap_debugfs_off_cache {
  24         struct list_head list;
  25         off_t min;
  26         off_t max;
  27         unsigned int base_reg;
  28 };
  29
  30 struct regmap_format {
  31         size_t buf_size;
  32         size_t reg_bytes;
  33         size_t pad_bytes;
  34         size_t val_bytes;
  35         void (*format_write)(struct regmap *map,
  36                              unsigned int reg, unsigned int val);
  37         void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
  38         void (*format_val)(void *buf, unsigned int val, unsigned int shift);
  39         unsigned int (*parse_val)(void *buf);
  40 };
  41
  42 struct regmap {
  43         struct mutex mutex;
  44         spinlock_t spinlock;
  45         regmap_lock lock;
  46         regmap_unlock unlock;
  47         void *lock_arg; /* This is passed to lock/unlock functions */
  48
  49         struct device *dev; /* Device we do I/O on */
  50         void *work_buf;     /* Scratch buffer used to format I/O */
  51         struct regmap_format format;  /* Buffer format */
  52         const struct regmap_bus *bus;
  53         void *bus_context;
  54         const char *name;
  55
  56 #ifdef CONFIG_DEBUG_FS
  57         struct dentry *debugfs;
  58         const char *debugfs_name;
  59
  60         unsigned int debugfs_reg_len;
  61         unsigned int debugfs_val_len;
  62         unsigned int debugfs_tot_len;
  63
  64         struct list_head debugfs_off_cache;
  65 #endif
  66
  67         unsigned int max_register;
  68         bool (*writeable_reg)(struct device *dev, unsigned int reg);
  69         bool (*readable_reg)(struct device *dev, unsigned int reg);
  70         bool (*volatile_reg)(struct device *dev, unsigned int reg);
  71         bool (*precious_reg)(struct device *dev, unsigned int reg);
  72         const struct regmap_access_table *wr_table;
  73         const struct regmap_access_table *rd_table;
  74         const struct regmap_access_table *volatile_table;
  75         const struct regmap_access_table *precious_table;
  76
  77         u8 read_flag_mask;
  78         u8 write_flag_mask;
  79
  80         /* number of bits to (left) shift the reg value when formatting*/
  81         int reg_shift;
  82         int reg_stride;
  83
  84         /* regcache specific members */
  85         const struct regcache_ops *cache_ops;
  86         enum regcache_type cache_type;
  87
  88         /* number of bytes in reg_defaults_raw */
  89         unsigned int cache_size_raw;
  90         /* number of bytes per word in reg_defaults_raw */
  91         unsigned int cache_word_size;
  92         /* number of entries in reg_defaults */
  93         unsigned int num_reg_defaults;
  94         /* number of entries in reg_defaults_raw */
  95         unsigned int num_reg_defaults_raw;
  96
  97         /* if set, only the cache is modified not the HW */
  98         u32 cache_only;
  99         /* if set, only the HW is modified not the cache */
 100         u32 cache_bypass;
 101         /* if set, remember to free reg_defaults_raw */
 102         bool cache_free;
 103
 104         struct reg_default *reg_defaults;
 105         const void *reg_defaults_raw;
 106         void *cache;
 107         u32 cache_dirty;
 108
 109         struct reg_default *patch;
 110         int patch_regs;
 111
 112         /* if set, converts bulk rw to single rw */
 113         bool use_single_rw;
 114
 115         struct rb_root range_tree;
 116         void *selector_work_buf;        /* Scratch buffer used for selector */
 117 };
 118
 119 struct regcache_ops {
 120         const char *name;
 121         enum regcache_type type;
 122         int (*init)(struct regmap *map);
 123         int (*exit)(struct regmap *map);
 124         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 125         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 126         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 127 };
 128
 129 bool regmap_writeable(struct regmap *map, unsigned int reg);
 130 bool regmap_readable(struct regmap *map, unsigned int reg);
 131 bool regmap_volatile(struct regmap *map, unsigned int reg);
 132 bool regmap_precious(struct regmap *map, unsigned int reg);
 133
 134 int _regmap_write(struct regmap *map, unsigned int reg,
 135                   unsigned int val);
 136
 137 struct regmap_range_node {
 138         struct rb_node node;
 139         const char *name;
 140         struct regmap *map;
 141
 142         unsigned int range_min;
 143         unsigned int range_max;
 144
 145         unsigned int selector_reg;
 146         unsigned int selector_mask;
 147         int selector_shift;
 148
 149         unsigned int window_start;
 150         unsigned int window_len;
 151 };
 152
 153 #ifdef CONFIG_DEBUG_FS
 154 extern void regmap_debugfs_initcall(void);
 155 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 156 extern void regmap_debugfs_exit(struct regmap *map);
 157 #else
 158 static inline void regmap_debugfs_initcall(void) { }
 159 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 160 static inline void regmap_debugfs_exit(struct regmap *map) { }
 161 #endif
 162
 163 /* regcache core declarations */
 164 int regcache_init(struct regmap *map, const struct regmap_config *config);
 165 void regcache_exit(struct regmap *map);
 166 int regcache_read(struct regmap *map,
 167                        unsigned int reg, unsigned int *value);
 168 int regcache_write(struct regmap *map,
 169                         unsigned int reg, unsigned int value);
 170 int regcache_sync(struct regmap *map);
 171
 172 unsigned int regcache_get_val(const void *base, unsigned int idx,
 173                               unsigned int word_size);
 174 bool regcache_set_val(void *base, unsigned int idx,
 175                       unsigned int val, unsigned int word_size);
 176 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 177
 178 extern struct regcache_ops regcache_rbtree_ops;
 179 extern struct regcache_ops regcache_lzo_ops;
 180
 181 #endif