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         gfp_t alloc_flags;
  63
  64         struct device *dev; /* Device we do I/O on */
  65         void *work_buf;     /* Scratch buffer used to format I/O */
  66         struct regmap_format format;  /* Buffer format */
  67         const struct regmap_bus *bus;
  68         void *bus_context;
  69         const char *name;
  70
  71         bool async;
  72         spinlock_t async_lock;
  73         wait_queue_head_t async_waitq;
  74         struct list_head async_list;
  75         struct list_head async_free;
  76         int async_ret;
  77
  78 #ifdef CONFIG_DEBUG_FS
  79         struct dentry *debugfs;
  80         const char *debugfs_name;
  81
  82         unsigned int debugfs_reg_len;
  83         unsigned int debugfs_val_len;
  84         unsigned int debugfs_tot_len;
  85
  86         struct list_head debugfs_off_cache;
  87         struct mutex cache_lock;
  88 #endif
  89
  90         unsigned int max_register;
  91         bool (*writeable_reg)(struct device *dev, unsigned int reg);
  92         bool (*readable_reg)(struct device *dev, unsigned int reg);
  93         bool (*volatile_reg)(struct device *dev, unsigned int reg);
  94         bool (*precious_reg)(struct device *dev, unsigned int reg);
  95         const struct regmap_access_table *wr_table;
  96         const struct regmap_access_table *rd_table;
  97         const struct regmap_access_table *volatile_table;
  98         const struct regmap_access_table *precious_table;
  99
 100         int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
 101         int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 102         int (*reg_update_bits)(void *context, unsigned int reg,
 103                                unsigned int mask, unsigned int val);
 104
 105         bool defer_caching;
 106
 107         u8 read_flag_mask;
 108         u8 write_flag_mask;
 109
 110         /* number of bits to (left) shift the reg value when formatting*/
 111         int reg_shift;
 112         int reg_stride;
 113         int reg_stride_order;
 114
 115         /* regcache specific members */
 116         const struct regcache_ops *cache_ops;
 117         enum regcache_type cache_type;
 118
 119         /* number of bytes in reg_defaults_raw */
 120         unsigned int cache_size_raw;
 121         /* number of bytes per word in reg_defaults_raw */
 122         unsigned int cache_word_size;
 123         /* number of entries in reg_defaults */
 124         unsigned int num_reg_defaults;
 125         /* number of entries in reg_defaults_raw */
 126         unsigned int num_reg_defaults_raw;
 127
 128         /* if set, only the cache is modified not the HW */
 129         bool cache_only;
 130         /* if set, only the HW is modified not the cache */
 131         bool cache_bypass;
 132         /* if set, remember to free reg_defaults_raw */
 133         bool cache_free;
 134
 135         struct reg_default *reg_defaults;
 136         const void *reg_defaults_raw;
 137         void *cache;
 138         /* if set, the cache contains newer data than the HW */
 139         bool cache_dirty;
 140         /* if set, the HW registers are known to match map->reg_defaults */
 141         bool no_sync_defaults;
 142
 143         struct reg_sequence *patch;
 144         int patch_regs;
 145
 146         /* if set, converts bulk read to single read */
 147         bool use_single_read;
 148         /* if set, converts bulk read to single read */
 149         bool use_single_write;
 150         /* if set, the device supports multi write mode */
 151         bool can_multi_write;
 152
 153         /* if set, raw reads/writes are limited to this size */
 154         size_t max_raw_read;
 155         size_t max_raw_write;
 156
 157         struct rb_root range_tree;
 158         void *selector_work_buf;        /* Scratch buffer used for selector */
 159 };
 160
 161 struct regcache_ops {
 162         const char *name;
 163         enum regcache_type type;
 164         int (*init)(struct regmap *map);
 165         int (*exit)(struct regmap *map);
 166 #ifdef CONFIG_DEBUG_FS
 167         void (*debugfs_init)(struct regmap *map);
 168 #endif
 169         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 170         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 171         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 172         int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 173 };
 174
 175 bool regmap_writeable(struct regmap *map, unsigned int reg);
 176 bool regmap_readable(struct regmap *map, unsigned int reg);
 177 bool regmap_volatile(struct regmap *map, unsigned int reg);
 178 bool regmap_precious(struct regmap *map, unsigned int reg);
 179
 180 int _regmap_write(struct regmap *map, unsigned int reg,
 181                   unsigned int val);
 182
 183 struct regmap_range_node {
 184         struct rb_node node;
 185         const char *name;
 186         struct regmap *map;
 187
 188         unsigned int range_min;
 189         unsigned int range_max;
 190
 191         unsigned int selector_reg;
 192         unsigned int selector_mask;
 193         int selector_shift;
 194
 195         unsigned int window_start;
 196         unsigned int window_len;
 197 };
 198
 199 struct regmap_field {
 200         struct regmap *regmap;
 201         unsigned int mask;
 202         /* lsb */
 203         unsigned int shift;
 204         unsigned int reg;
 205
 206         unsigned int id_size;
 207         unsigned int id_offset;
 208 };
 209
 210 #ifdef CONFIG_DEBUG_FS
 211 extern void regmap_debugfs_initcall(void);
 212 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 213 extern void regmap_debugfs_exit(struct regmap *map);
 214 #else
 215 static inline void regmap_debugfs_initcall(void) { }
 216 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 217 static inline void regmap_debugfs_exit(struct regmap *map) { }
 218 #endif
 219
 220 /* regcache core declarations */
 221 int regcache_init(struct regmap *map, const struct regmap_config *config);
 222 void regcache_exit(struct regmap *map);
 223 int regcache_read(struct regmap *map,
 224                        unsigned int reg, unsigned int *value);
 225 int regcache_write(struct regmap *map,
 226                         unsigned int reg, unsigned int value);
 227 int regcache_sync(struct regmap *map);
 228 int regcache_sync_block(struct regmap *map, void *block,
 229                         unsigned long *cache_present,
 230                         unsigned int block_base, unsigned int start,
 231                         unsigned int end);
 232
 233 static inline const void *regcache_get_val_addr(struct regmap *map,
 234                                                 const void *base,
 235                                                 unsigned int idx)
 236 {
 237         return base + (map->cache_word_size * idx);
 238 }
 239
 240 unsigned int regcache_get_val(struct regmap *map, const void *base,
 241                               unsigned int idx);
 242 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 243                       unsigned int val);
 244 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 245
 246 int _regmap_raw_write(struct regmap *map, unsigned int reg,
 247                       const void *val, size_t val_len);
 248
 249 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 250
 251 enum regmap_endian regmap_get_val_endian(struct device *dev,
 252                                          const struct regmap_bus *bus,
 253                                          const struct regmap_config *config);
 254
 255 extern struct regcache_ops regcache_rbtree_ops;
 256 extern struct regcache_ops regcache_lzo_ops;
 257 extern struct regcache_ops regcache_flat_ops;
 258
 259 static inline const char *regmap_name(const struct regmap *map)
 260 {
 261         if (map->dev)
 262                 return dev_name(map->dev);
 263
 264         return map->name;
 265 }
 266
 267 static inline unsigned int regmap_get_offset(const struct regmap *map,
 268                                              unsigned int index)
 269 {
 270         if (map->reg_stride_order >= 0)
 271                 return index << map->reg_stride_order;
 272         else
 273                 return index * map->reg_stride;
 274 }
 275
 276 static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
 277                                                        unsigned int reg)
 278 {
 279         return reg >> map->reg_stride_order;
 280 }
 281
 282 #endif