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         union {
  53                 struct mutex mutex;
  54                 struct {
  55                         spinlock_t spinlock;
  56                         unsigned long spinlock_flags;
  57                 };
  58         };
  59         regmap_lock lock;
  60         regmap_unlock unlock;
  61         void *lock_arg; /* This is passed to lock/unlock functions */
  62
  63         struct device *dev; /* Device we do I/O on */
  64         void *work_buf;     /* Scratch buffer used to format I/O */
  65         struct regmap_format format;  /* Buffer format */
  66         const struct regmap_bus *bus;
  67         void *bus_context;
  68         const char *name;
  69
  70         bool async;
  71         spinlock_t async_lock;
  72         wait_queue_head_t async_waitq;
  73         struct list_head async_list;
  74         struct list_head async_free;
  75         int async_ret;
  76
  77 #ifdef CONFIG_DEBUG_FS
  78         struct dentry *debugfs;
  79         const char *debugfs_name;
  80
  81         unsigned int debugfs_reg_len;
  82         unsigned int debugfs_val_len;
  83         unsigned int debugfs_tot_len;
  84
  85         struct list_head debugfs_off_cache;
  86         struct mutex cache_lock;
  87 #endif
  88
  89         unsigned int max_register;
  90         bool (*writeable_reg)(struct device *dev, unsigned int reg);
  91         bool (*readable_reg)(struct device *dev, unsigned int reg);
  92         bool (*volatile_reg)(struct device *dev, unsigned int reg);
  93         bool (*precious_reg)(struct device *dev, unsigned int reg);
  94         const struct regmap_access_table *wr_table;
  95         const struct regmap_access_table *rd_table;
  96         const struct regmap_access_table *volatile_table;
  97         const struct regmap_access_table *precious_table;
  98
  99         int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
 100         int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 101
 102         bool defer_caching;
 103
 104         u8 read_flag_mask;
 105         u8 write_flag_mask;
 106
 107         /* number of bits to (left) shift the reg value when formatting*/
 108         int reg_shift;
 109         int reg_stride;
 110
 111         /* regcache specific members */
 112         const struct regcache_ops *cache_ops;
 113         enum regcache_type cache_type;
 114
 115         /* number of bytes in reg_defaults_raw */
 116         unsigned int cache_size_raw;
 117         /* number of bytes per word in reg_defaults_raw */
 118         unsigned int cache_word_size;
 119         /* number of entries in reg_defaults */
 120         unsigned int num_reg_defaults;
 121         /* number of entries in reg_defaults_raw */
 122         unsigned int num_reg_defaults_raw;
 123
 124         /* if set, only the cache is modified not the HW */
 125         u32 cache_only;
 126         /* if set, only the HW is modified not the cache */
 127         u32 cache_bypass;
 128         /* if set, remember to free reg_defaults_raw */
 129         bool cache_free;
 130
 131         struct reg_default *reg_defaults;
 132         const void *reg_defaults_raw;
 133         void *cache;
 134         u32 cache_dirty;
 135
 136         struct reg_default *patch;
 137         int patch_regs;
 138
 139         /* if set, converts bulk rw to single rw */
 140         bool use_single_rw;
 141         /* if set, the device supports multi write mode */
 142         bool can_multi_write;
 143
 144         struct rb_root range_tree;
 145         void *selector_work_buf;        /* Scratch buffer used for selector */
 146 };
 147
 148 struct regcache_ops {
 149         const char *name;
 150         enum regcache_type type;
 151         int (*init)(struct regmap *map);
 152         int (*exit)(struct regmap *map);
 153 #ifdef CONFIG_DEBUG_FS
 154         void (*debugfs_init)(struct regmap *map);
 155 #endif
 156         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 157         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 158         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 159         int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 160 };
 161
 162 bool regmap_writeable(struct regmap *map, unsigned int reg);
 163 bool regmap_readable(struct regmap *map, unsigned int reg);
 164 bool regmap_volatile(struct regmap *map, unsigned int reg);
 165 bool regmap_precious(struct regmap *map, unsigned int reg);
 166
 167 int _regmap_write(struct regmap *map, unsigned int reg,
 168                   unsigned int val);
 169
 170 struct regmap_range_node {
 171         struct rb_node node;
 172         const char *name;
 173         struct regmap *map;
 174
 175         unsigned int range_min;
 176         unsigned int range_max;
 177
 178         unsigned int selector_reg;
 179         unsigned int selector_mask;
 180         int selector_shift;
 181
 182         unsigned int window_start;
 183         unsigned int window_len;
 184 };
 185
 186 struct regmap_field {
 187         struct regmap *regmap;
 188         unsigned int mask;
 189         /* lsb */
 190         unsigned int shift;
 191         unsigned int reg;
 192
 193         unsigned int id_size;
 194         unsigned int id_offset;
 195 };
 196
 197 #ifdef CONFIG_DEBUG_FS
 198 extern void regmap_debugfs_initcall(void);
 199 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 200 extern void regmap_debugfs_exit(struct regmap *map);
 201 #else
 202 static inline void regmap_debugfs_initcall(void) { }
 203 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 204 static inline void regmap_debugfs_exit(struct regmap *map) { }
 205 #endif
 206
 207 /* regcache core declarations */
 208 int regcache_init(struct regmap *map, const struct regmap_config *config);
 209 void regcache_exit(struct regmap *map);
 210 int regcache_read(struct regmap *map,
 211                        unsigned int reg, unsigned int *value);
 212 int regcache_write(struct regmap *map,
 213                         unsigned int reg, unsigned int value);
 214 int regcache_sync(struct regmap *map);
 215 int regcache_sync_block(struct regmap *map, void *block,
 216                         unsigned long *cache_present,
 217                         unsigned int block_base, unsigned int start,
 218                         unsigned int end);
 219
 220 static inline const void *regcache_get_val_addr(struct regmap *map,
 221                                                 const void *base,
 222                                                 unsigned int idx)
 223 {
 224         return base + (map->cache_word_size * idx);
 225 }
 226
 227 unsigned int regcache_get_val(struct regmap *map, const void *base,
 228                               unsigned int idx);
 229 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 230                       unsigned int val);
 231 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 232
 233 int _regmap_raw_write(struct regmap *map, unsigned int reg,
 234                       const void *val, size_t val_len);
 235
 236 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 237
 238 enum regmap_endian regmap_get_val_endian(struct device *dev,
 239                                          const struct regmap_bus *bus,
 240                                          const struct regmap_config *config);
 241
 242 extern struct regcache_ops regcache_rbtree_ops;
 243 extern struct regcache_ops regcache_lzo_ops;
 244 extern struct regcache_ops regcache_flat_ops;
 245
 246 static inline const char *regmap_name(const struct regmap *map)
 247 {
 248         if (map->dev)
 249                 return dev_name(map->dev);
 250
 251         return map->name;
 252 }
 253
 254 #endif