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 #include <linux/wait.h>
  20
  21 struct regmap;
  22 struct regcache_ops;
  23
  24 struct regmap_debugfs_off_cache {
  25         struct list_head list;
  26         off_t min;
  27         off_t max;
  28         unsigned int base_reg;
  29         unsigned int max_reg;
  30 };
  31
  32 struct regmap_format {
  33         size_t buf_size;
  34         size_t reg_bytes;
  35         size_t pad_bytes;
  36         size_t val_bytes;
  37         void (*format_write)(struct regmap *map,
  38                              unsigned int reg, unsigned int val);
  39         void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
  40         void (*format_val)(void *buf, unsigned int val, unsigned int shift);
  41         unsigned int (*parse_val)(const void *buf);
  42         void (*parse_inplace)(void *buf);
  43 };
  44
  45 struct regmap_async {
  46         struct list_head list;
  47         struct regmap *map;
  48         void *work_buf;
  49 };
  50
  51 struct regmap {
  52         struct mutex mutex;
  53         spinlock_t spinlock;
  54         unsigned long spinlock_flags;
  55         regmap_lock lock;
  56         regmap_unlock unlock;
  57         void *lock_arg; /* This is passed to lock/unlock functions */
  58
  59         struct device *dev; /* Device we do I/O on */
  60         void *work_buf;     /* Scratch buffer used to format I/O */
  61         struct regmap_format format;  /* Buffer format */
  62         const struct regmap_bus *bus;
  63         void *bus_context;
  64         const char *name;
  65
  66         spinlock_t async_lock;
  67         wait_queue_head_t async_waitq;
  68         struct list_head async_list;
  69         struct list_head async_free;
  70         int async_ret;
  71
  72 #ifdef CONFIG_DEBUG_FS
  73         struct dentry *debugfs;
  74         const char *debugfs_name;
  75
  76         unsigned int debugfs_reg_len;
  77         unsigned int debugfs_val_len;
  78         unsigned int debugfs_tot_len;
  79
  80         struct list_head debugfs_off_cache;
  81         struct mutex cache_lock;
  82 #endif
  83
  84         unsigned int max_register;
  85         bool (*writeable_reg)(struct device *dev, unsigned int reg);
  86         bool (*readable_reg)(struct device *dev, unsigned int reg);
  87         bool (*volatile_reg)(struct device *dev, unsigned int reg);
  88         bool (*precious_reg)(struct device *dev, unsigned int reg);
  89         const struct regmap_access_table *wr_table;
  90         const struct regmap_access_table *rd_table;
  91         const struct regmap_access_table *volatile_table;
  92         const struct regmap_access_table *precious_table;
  93
  94         int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
  95         int (*reg_write)(void *context, unsigned int reg, unsigned int val);
  96
  97         bool defer_caching;
  98
  99         u8 read_flag_mask;
 100         u8 write_flag_mask;
 101
 102         /* number of bits to (left) shift the reg value when formatting*/
 103         int reg_shift;
 104         int reg_stride;
 105
 106         /* regcache specific members */
 107         const struct regcache_ops *cache_ops;
 108         enum regcache_type cache_type;
 109
 110         /* number of bytes in reg_defaults_raw */
 111         unsigned int cache_size_raw;
 112         /* number of bytes per word in reg_defaults_raw */
 113         unsigned int cache_word_size;
 114         /* number of entries in reg_defaults */
 115         unsigned int num_reg_defaults;
 116         /* number of entries in reg_defaults_raw */
 117         unsigned int num_reg_defaults_raw;
 118
 119         /* if set, only the cache is modified not the HW */
 120         u32 cache_only;
 121         /* if set, only the HW is modified not the cache */
 122         u32 cache_bypass;
 123         /* if set, remember to free reg_defaults_raw */
 124         bool cache_free;
 125
 126         struct reg_default *reg_defaults;
 127         const void *reg_defaults_raw;
 128         void *cache;
 129         u32 cache_dirty;
 130
 131         struct reg_default *patch;
 132         int patch_regs;
 133
 134         /* if set, converts bulk rw to single rw */
 135         bool use_single_rw;
 136
 137         struct rb_root range_tree;
 138         void *selector_work_buf;        /* Scratch buffer used for selector */
 139 };
 140
 141 struct regcache_ops {
 142         const char *name;
 143         enum regcache_type type;
 144         int (*init)(struct regmap *map);
 145         int (*exit)(struct regmap *map);
 146         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 147         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 148         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 149         int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 150 };
 151
 152 bool regmap_writeable(struct regmap *map, unsigned int reg);
 153 bool regmap_readable(struct regmap *map, unsigned int reg);
 154 bool regmap_volatile(struct regmap *map, unsigned int reg);
 155 bool regmap_precious(struct regmap *map, unsigned int reg);
 156
 157 int _regmap_write(struct regmap *map, unsigned int reg,
 158                   unsigned int val);
 159
 160 struct regmap_range_node {
 161         struct rb_node node;
 162         const char *name;
 163         struct regmap *map;
 164
 165         unsigned int range_min;
 166         unsigned int range_max;
 167
 168         unsigned int selector_reg;
 169         unsigned int selector_mask;
 170         int selector_shift;
 171
 172         unsigned int window_start;
 173         unsigned int window_len;
 174 };
 175
 176 struct regmap_field {
 177         struct regmap *regmap;
 178         unsigned int mask;
 179         /* lsb */
 180         unsigned int shift;
 181         unsigned int reg;
 182 };
 183
 184 #ifdef CONFIG_DEBUG_FS
 185 extern void regmap_debugfs_initcall(void);
 186 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 187 extern void regmap_debugfs_exit(struct regmap *map);
 188 #else
 189 static inline void regmap_debugfs_initcall(void) { }
 190 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 191 static inline void regmap_debugfs_exit(struct regmap *map) { }
 192 #endif
 193
 194 /* regcache core declarations */
 195 int regcache_init(struct regmap *map, const struct regmap_config *config);
 196 void regcache_exit(struct regmap *map);
 197 int regcache_read(struct regmap *map,
 198                        unsigned int reg, unsigned int *value);
 199 int regcache_write(struct regmap *map,
 200                         unsigned int reg, unsigned int value);
 201 int regcache_sync(struct regmap *map);
 202 int regcache_sync_block(struct regmap *map, void *block,
 203                         unsigned long *cache_present,
 204                         unsigned int block_base, unsigned int start,
 205                         unsigned int end);
 206
 207 static inline const void *regcache_get_val_addr(struct regmap *map,
 208                                                 const void *base,
 209                                                 unsigned int idx)
 210 {
 211         return base + (map->cache_word_size * idx);
 212 }
 213
 214 unsigned int regcache_get_val(struct regmap *map, const void *base,
 215                               unsigned int idx);
 216 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 217                       unsigned int val);
 218 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 219
 220 int _regmap_raw_write(struct regmap *map, unsigned int reg,
 221                       const void *val, size_t val_len, bool async);
 222
 223 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 224
 225 extern struct regcache_ops regcache_rbtree_ops;
 226 extern struct regcache_ops regcache_lzo_ops;
 227 extern struct regcache_ops regcache_flat_ops;
 228
 229 #endif