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/device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/fs.h>
  19 #include <linux/list.h>
  20 #include <linux/wait.h>
  21
  22 struct regmap;
  23 struct regcache_ops;
  24
  25 struct regmap_debugfs_off_cache {
  26         struct list_head list;
  27         off_t min;
  28         off_t max;
  29         unsigned int base_reg;
  30         unsigned int max_reg;
  31 };
  32
  33 struct regmap_format {
  34         size_t buf_size;
  35         size_t reg_bytes;
  36         size_t pad_bytes;
  37         size_t val_bytes;
  38         void (*format_write)(struct regmap *map,
  39                              unsigned int reg, unsigned int val);
  40         void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
  41         void (*format_val)(void *buf, unsigned int val, unsigned int shift);
  42         unsigned int (*parse_val)(const void *buf);
  43         void (*parse_inplace)(void *buf);
  44 };
  45
  46 struct regmap_async {
  47         struct list_head list;
  48         struct regmap *map;
  49         void *work_buf;
  50 };
  51
  52 struct regmap {
  53         union {
  54                 struct mutex mutex;
  55                 struct {
  56                         spinlock_t spinlock;
  57                         unsigned long spinlock_flags;
  58                 };
  59         };
  60         regmap_lock lock;
  61         regmap_unlock unlock;
  62         void *lock_arg; /* This is passed to lock/unlock functions */
  63         gfp_t alloc_flags;
  64
  65         struct device *dev; /* Device we do I/O on */
  66         void *work_buf;     /* Scratch buffer used to format I/O */
  67         struct regmap_format format;  /* Buffer format */
  68         const struct regmap_bus *bus;
  69         void *bus_context;
  70         const char *name;
  71
  72         bool async;
  73         spinlock_t async_lock;
  74         wait_queue_head_t async_waitq;
  75         struct list_head async_list;
  76         struct list_head async_free;
  77         int async_ret;
  78
  79 #ifdef CONFIG_DEBUG_FS
  80         bool debugfs_disable;
  81         struct dentry *debugfs;
  82         const char *debugfs_name;
  83
  84         unsigned int debugfs_reg_len;
  85         unsigned int debugfs_val_len;
  86         unsigned int debugfs_tot_len;
  87
  88         struct list_head debugfs_off_cache;
  89         struct mutex cache_lock;
  90 #endif
  91
  92         unsigned int max_register;
  93         bool (*writeable_reg)(struct device *dev, unsigned int reg);
  94         bool (*readable_reg)(struct device *dev, unsigned int reg);
  95         bool (*volatile_reg)(struct device *dev, unsigned int reg);
  96         bool (*precious_reg)(struct device *dev, unsigned int reg);
  97         bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg);
  98         bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
  99         const struct regmap_access_table *wr_table;
 100         const struct regmap_access_table *rd_table;
 101         const struct regmap_access_table *volatile_table;
 102         const struct regmap_access_table *precious_table;
 103         const struct regmap_access_table *wr_noinc_table;
 104         const struct regmap_access_table *rd_noinc_table;
 105
 106         int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
 107         int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 108         int (*reg_update_bits)(void *context, unsigned int reg,
 109                                unsigned int mask, unsigned int val);
 110
 111         bool defer_caching;
 112
 113         unsigned long read_flag_mask;
 114         unsigned long write_flag_mask;
 115
 116         /* number of bits to (left) shift the reg value when formatting*/
 117         int reg_shift;
 118         int reg_stride;
 119         int reg_stride_order;
 120
 121         /* regcache specific members */
 122         const struct regcache_ops *cache_ops;
 123         enum regcache_type cache_type;
 124
 125         /* number of bytes in reg_defaults_raw */
 126         unsigned int cache_size_raw;
 127         /* number of bytes per word in reg_defaults_raw */
 128         unsigned int cache_word_size;
 129         /* number of entries in reg_defaults */
 130         unsigned int num_reg_defaults;
 131         /* number of entries in reg_defaults_raw */
 132         unsigned int num_reg_defaults_raw;
 133
 134         /* if set, only the cache is modified not the HW */
 135         bool cache_only;
 136         /* if set, only the HW is modified not the cache */
 137         bool cache_bypass;
 138         /* if set, remember to free reg_defaults_raw */
 139         bool cache_free;
 140
 141         struct reg_default *reg_defaults;
 142         const void *reg_defaults_raw;
 143         void *cache;
 144         /* if set, the cache contains newer data than the HW */
 145         bool cache_dirty;
 146         /* if set, the HW registers are known to match map->reg_defaults */
 147         bool no_sync_defaults;
 148
 149         struct reg_sequence *patch;
 150         int patch_regs;
 151
 152         /* if set, converts bulk read to single read */
 153         bool use_single_read;
 154         /* if set, converts bulk write to single write */
 155         bool use_single_write;
 156         /* if set, the device supports multi write mode */
 157         bool can_multi_write;
 158
 159         /* if set, raw reads/writes are limited to this size */
 160         size_t max_raw_read;
 161         size_t max_raw_write;
 162
 163         struct rb_root range_tree;
 164         void *selector_work_buf;        /* Scratch buffer used for selector */
 165
 166         struct hwspinlock *hwlock;
 167 };
 168
 169 struct regcache_ops {
 170         const char *name;
 171         enum regcache_type type;
 172         int (*init)(struct regmap *map);
 173         int (*exit)(struct regmap *map);
 174 #ifdef CONFIG_DEBUG_FS
 175         void (*debugfs_init)(struct regmap *map);
 176 #endif
 177         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 178         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 179         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 180         int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 181 };
 182
 183 bool regmap_cached(struct regmap *map, unsigned int reg);
 184 bool regmap_writeable(struct regmap *map, unsigned int reg);
 185 bool regmap_readable(struct regmap *map, unsigned int reg);
 186 bool regmap_volatile(struct regmap *map, unsigned int reg);
 187 bool regmap_precious(struct regmap *map, unsigned int reg);
 188 bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
 189 bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
 190
 191 int _regmap_write(struct regmap *map, unsigned int reg,
 192                   unsigned int val);
 193
 194 struct regmap_range_node {
 195         struct rb_node node;
 196         const char *name;
 197         struct regmap *map;
 198
 199         unsigned int range_min;
 200         unsigned int range_max;
 201
 202         unsigned int selector_reg;
 203         unsigned int selector_mask;
 204         int selector_shift;
 205
 206         unsigned int window_start;
 207         unsigned int window_len;
 208 };
 209
 210 struct regmap_field {
 211         struct regmap *regmap;
 212         unsigned int mask;
 213         /* lsb */
 214         unsigned int shift;
 215         unsigned int reg;
 216
 217         unsigned int id_size;
 218         unsigned int id_offset;
 219 };
 220
 221 #ifdef CONFIG_DEBUG_FS
 222 extern void regmap_debugfs_initcall(void);
 223 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 224 extern void regmap_debugfs_exit(struct regmap *map);
 225
 226 static inline void regmap_debugfs_disable(struct regmap *map)
 227 {
 228         map->debugfs_disable = true;
 229 }
 230
 231 #else
 232 static inline void regmap_debugfs_initcall(void) { }
 233 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 234 static inline void regmap_debugfs_exit(struct regmap *map) { }
 235 static inline void regmap_debugfs_disable(struct regmap *map) { }
 236 #endif
 237
 238 /* regcache core declarations */
 239 int regcache_init(struct regmap *map, const struct regmap_config *config);
 240 void regcache_exit(struct regmap *map);
 241 int regcache_read(struct regmap *map,
 242                        unsigned int reg, unsigned int *value);
 243 int regcache_write(struct regmap *map,
 244                         unsigned int reg, unsigned int value);
 245 int regcache_sync(struct regmap *map);
 246 int regcache_sync_block(struct regmap *map, void *block,
 247                         unsigned long *cache_present,
 248                         unsigned int block_base, unsigned int start,
 249                         unsigned int end);
 250
 251 static inline const void *regcache_get_val_addr(struct regmap *map,
 252                                                 const void *base,
 253                                                 unsigned int idx)
 254 {
 255         return base + (map->cache_word_size * idx);
 256 }
 257
 258 unsigned int regcache_get_val(struct regmap *map, const void *base,
 259                               unsigned int idx);
 260 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 261                       unsigned int val);
 262 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 263
 264 int _regmap_raw_write(struct regmap *map, unsigned int reg,
 265                       const void *val, size_t val_len);
 266
 267 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 268
 269 enum regmap_endian regmap_get_val_endian(struct device *dev,
 270                                          const struct regmap_bus *bus,
 271                                          const struct regmap_config *config);
 272
 273 extern struct regcache_ops regcache_rbtree_ops;
 274 extern struct regcache_ops regcache_lzo_ops;
 275 extern struct regcache_ops regcache_flat_ops;
 276
 277 static inline const char *regmap_name(const struct regmap *map)
 278 {
 279         if (map->dev)
 280                 return dev_name(map->dev);
 281
 282         return map->name;
 283 }
 284
 285 static inline unsigned int regmap_get_offset(const struct regmap *map,
 286                                              unsigned int index)
 287 {
 288         if (map->reg_stride_order >= 0)
 289                 return index << map->reg_stride_order;
 290         else
 291                 return index * map->reg_stride;
 292 }
 293
 294 static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
 295                                                        unsigned int reg)
 296 {
 297         return reg >> map->reg_stride_order;
 298 }
 299
 300 #endif