drivers/base/regmap/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Register map access API internal header
   4  *
   5  * Copyright 2011 Wolfson Microelectronics plc
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #ifndef _REGMAP_INTERNAL_H
  11 #define _REGMAP_INTERNAL_H
  12
  13 #include <linux/device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/fs.h>
  16 #include <linux/list.h>
  17 #include <linux/wait.h>
  18
  19 struct regmap;
  20 struct regcache_ops;
  21
  22 struct regmap_debugfs_off_cache {
  23         struct list_head list;
  24         off_t min;
  25         off_t max;
  26         unsigned int base_reg;
  27         unsigned int max_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)(const void *buf);
  40         void (*parse_inplace)(void *buf);
  41 };
  42
  43 struct regmap_async {
  44         struct list_head list;
  45         struct regmap *map;
  46         void *work_buf;
  47 };
  48
  49 struct regmap {
  50         union {
  51                 struct mutex mutex;
  52                 struct {
  53                         spinlock_t spinlock;
  54                         unsigned long spinlock_flags;
  55                 };
  56         };
  57         regmap_lock lock;
  58         regmap_unlock unlock;
  59         void *lock_arg; /* This is passed to lock/unlock functions */
  60         gfp_t alloc_flags;
  61
  62         struct device *dev; /* Device we do I/O on */
  63         void *work_buf;     /* Scratch buffer used to format I/O */
  64         struct regmap_format format;  /* Buffer format */
  65         const struct regmap_bus *bus;
  66         void *bus_context;
  67         const char *name;
  68
  69         bool async;
  70         spinlock_t async_lock;
  71         wait_queue_head_t async_waitq;
  72         struct list_head async_list;
  73         struct list_head async_free;
  74         int async_ret;
  75
  76 #ifdef CONFIG_DEBUG_FS
  77         bool debugfs_disable;
  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         bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg);
  95         bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
  96         const struct regmap_access_table *wr_table;
  97         const struct regmap_access_table *rd_table;
  98         const struct regmap_access_table *volatile_table;
  99         const struct regmap_access_table *precious_table;
 100         const struct regmap_access_table *wr_noinc_table;
 101         const struct regmap_access_table *rd_noinc_table;
 102
 103         int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
 104         int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 105         int (*reg_update_bits)(void *context, unsigned int reg,
 106                                unsigned int mask, unsigned int val);
 107
 108         bool defer_caching;
 109
 110         unsigned long read_flag_mask;
 111         unsigned long write_flag_mask;
 112
 113         /* number of bits to (left) shift the reg value when formatting*/
 114         int reg_shift;
 115         int reg_stride;
 116         int reg_stride_order;
 117
 118         /* regcache specific members */
 119         const struct regcache_ops *cache_ops;
 120         enum regcache_type cache_type;
 121
 122         /* number of bytes in reg_defaults_raw */
 123         unsigned int cache_size_raw;
 124         /* number of bytes per word in reg_defaults_raw */
 125         unsigned int cache_word_size;
 126         /* number of entries in reg_defaults */
 127         unsigned int num_reg_defaults;
 128         /* number of entries in reg_defaults_raw */
 129         unsigned int num_reg_defaults_raw;
 130
 131         /* if set, only the cache is modified not the HW */
 132         bool cache_only;
 133         /* if set, only the HW is modified not the cache */
 134         bool cache_bypass;
 135         /* if set, remember to free reg_defaults_raw */
 136         bool cache_free;
 137
 138         struct reg_default *reg_defaults;
 139         const void *reg_defaults_raw;
 140         void *cache;
 141         /* if set, the cache contains newer data than the HW */
 142         bool cache_dirty;
 143         /* if set, the HW registers are known to match map->reg_defaults */
 144         bool no_sync_defaults;
 145
 146         struct reg_sequence *patch;
 147         int patch_regs;
 148
 149         /* if set, converts bulk read to single read */
 150         bool use_single_read;
 151         /* if set, converts bulk write to single write */
 152         bool use_single_write;
 153         /* if set, the device supports multi write mode */
 154         bool can_multi_write;
 155
 156         /* if set, raw reads/writes are limited to this size */
 157         size_t max_raw_read;
 158         size_t max_raw_write;
 159
 160         struct rb_root range_tree;
 161         void *selector_work_buf;        /* Scratch buffer used for selector */
 162
 163         struct hwspinlock *hwlock;
 164 };
 165
 166 struct regcache_ops {
 167         const char *name;
 168         enum regcache_type type;
 169         int (*init)(struct regmap *map);
 170         int (*exit)(struct regmap *map);
 171 #ifdef CONFIG_DEBUG_FS
 172         void (*debugfs_init)(struct regmap *map);
 173 #endif
 174         int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 175         int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 176         int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
 177         int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 178 };
 179
 180 bool regmap_cached(struct regmap *map, unsigned int reg);
 181 bool regmap_writeable(struct regmap *map, unsigned int reg);
 182 bool regmap_readable(struct regmap *map, unsigned int reg);
 183 bool regmap_volatile(struct regmap *map, unsigned int reg);
 184 bool regmap_precious(struct regmap *map, unsigned int reg);
 185 bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
 186 bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
 187
 188 int _regmap_write(struct regmap *map, unsigned int reg,
 189                   unsigned int val);
 190
 191 struct regmap_range_node {
 192         struct rb_node node;
 193         const char *name;
 194         struct regmap *map;
 195
 196         unsigned int range_min;
 197         unsigned int range_max;
 198
 199         unsigned int selector_reg;
 200         unsigned int selector_mask;
 201         int selector_shift;
 202
 203         unsigned int window_start;
 204         unsigned int window_len;
 205 };
 206
 207 struct regmap_field {
 208         struct regmap *regmap;
 209         unsigned int mask;
 210         /* lsb */
 211         unsigned int shift;
 212         unsigned int reg;
 213
 214         unsigned int id_size;
 215         unsigned int id_offset;
 216 };
 217
 218 #ifdef CONFIG_DEBUG_FS
 219 extern void regmap_debugfs_initcall(void);
 220 extern void regmap_debugfs_init(struct regmap *map, const char *name);
 221 extern void regmap_debugfs_exit(struct regmap *map);
 222
 223 static inline void regmap_debugfs_disable(struct regmap *map)
 224 {
 225         map->debugfs_disable = true;
 226 }
 227
 228 #else
 229 static inline void regmap_debugfs_initcall(void) { }
 230 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 231 static inline void regmap_debugfs_exit(struct regmap *map) { }
 232 static inline void regmap_debugfs_disable(struct regmap *map) { }
 233 #endif
 234
 235 /* regcache core declarations */
 236 int regcache_init(struct regmap *map, const struct regmap_config *config);
 237 void regcache_exit(struct regmap *map);
 238 int regcache_read(struct regmap *map,
 239                        unsigned int reg, unsigned int *value);
 240 int regcache_write(struct regmap *map,
 241                         unsigned int reg, unsigned int value);
 242 int regcache_sync(struct regmap *map);
 243 int regcache_sync_block(struct regmap *map, void *block,
 244                         unsigned long *cache_present,
 245                         unsigned int block_base, unsigned int start,
 246                         unsigned int end);
 247
 248 static inline const void *regcache_get_val_addr(struct regmap *map,
 249                                                 const void *base,
 250                                                 unsigned int idx)
 251 {
 252         return base + (map->cache_word_size * idx);
 253 }
 254
 255 unsigned int regcache_get_val(struct regmap *map, const void *base,
 256                               unsigned int idx);
 257 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 258                       unsigned int val);
 259 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
 260
 261 int _regmap_raw_write(struct regmap *map, unsigned int reg,
 262                       const void *val, size_t val_len);
 263
 264 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 265
 266 enum regmap_endian regmap_get_val_endian(struct device *dev,
 267                                          const struct regmap_bus *bus,
 268                                          const struct regmap_config *config);
 269
 270 extern struct regcache_ops regcache_rbtree_ops;
 271 extern struct regcache_ops regcache_lzo_ops;
 272 extern struct regcache_ops regcache_flat_ops;
 273
 274 static inline const char *regmap_name(const struct regmap *map)
 275 {
 276         if (map->dev)
 277                 return dev_name(map->dev);
 278
 279         return map->name;
 280 }
 281
 282 static inline unsigned int regmap_get_offset(const struct regmap *map,
 283                                              unsigned int index)
 284 {
 285         if (map->reg_stride_order >= 0)
 286                 return index << map->reg_stride_order;
 287         else
 288                 return index * map->reg_stride;
 289 }
 290
 291 static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
 292                                                        unsigned int reg)
 293 {
 294         return reg >> map->reg_stride_order;
 295 }
 296
 297 #endif