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 reg_downshift; 35 size_t val_bytes; 36 void (*format_write)(struct regmap *map, 37 unsigned int reg, unsigned int val); 38 void (*format_reg)(void *buf, unsigned int reg, unsigned int shift); 39 void (*format_val)(void *buf, unsigned int val, unsigned int shift); 40 unsigned int (*parse_val)(const void *buf); 41 void (*parse_inplace)(void *buf); 42 }; 43 44 struct regmap_async { 45 struct list_head list; 46 struct regmap *map; 47 void *work_buf; 48 }; 49 50 struct regmap { 51 union { 52 struct mutex mutex; 53 struct { 54 spinlock_t spinlock; 55 unsigned long spinlock_flags; 56 }; 57 struct { 58 raw_spinlock_t raw_spinlock; 59 unsigned long raw_spinlock_flags; 60 }; 61 }; 62 regmap_lock lock; 63 regmap_unlock unlock; 64 void *lock_arg; /* This is passed to lock/unlock functions */ 65 gfp_t alloc_flags; 66 unsigned int reg_base; 67 68 struct device *dev; /* Device we do I/O on */ 69 void *work_buf; /* Scratch buffer used to format I/O */ 70 struct regmap_format format; /* Buffer format */ 71 const struct regmap_bus *bus; 72 void *bus_context; 73 const char *name; 74 75 bool async; 76 spinlock_t async_lock; 77 wait_queue_head_t async_waitq; 78 struct list_head async_list; 79 struct list_head async_free; 80 int async_ret; 81 82 #ifdef CONFIG_DEBUG_FS 83 bool debugfs_disable; 84 struct dentry *debugfs; 85 const char *debugfs_name; 86 87 unsigned int debugfs_reg_len; 88 unsigned int debugfs_val_len; 89 unsigned int debugfs_tot_len; 90 91 struct list_head debugfs_off_cache; 92 struct mutex cache_lock; 93 #endif 94 95 unsigned int max_register; 96 bool (*writeable_reg)(struct device *dev, unsigned int reg); 97 bool (*readable_reg)(struct device *dev, unsigned int reg); 98 bool (*volatile_reg)(struct device *dev, unsigned int reg); 99 bool (*precious_reg)(struct device *dev, unsigned int reg); 100 bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg); 101 bool (*readable_noinc_reg)(struct device *dev, unsigned int reg); 102 const struct regmap_access_table *wr_table; 103 const struct regmap_access_table *rd_table; 104 const struct regmap_access_table *volatile_table; 105 const struct regmap_access_table *precious_table; 106 const struct regmap_access_table *wr_noinc_table; 107 const struct regmap_access_table *rd_noinc_table; 108 109 int (*reg_read)(void *context, unsigned int reg, unsigned int *val); 110 int (*reg_write)(void *context, unsigned int reg, unsigned int val); 111 int (*reg_update_bits)(void *context, unsigned int reg, 112 unsigned int mask, unsigned int val); 113 /* Bulk read/write */ 114 int (*read)(void *context, const void *reg_buf, size_t reg_size, 115 void *val_buf, size_t val_size); 116 int (*write)(void *context, const void *data, size_t count); 117 118 bool defer_caching; 119 120 unsigned long read_flag_mask; 121 unsigned long write_flag_mask; 122 123 /* number of bits to (left) shift the reg value when formatting*/ 124 int reg_shift; 125 int reg_stride; 126 int reg_stride_order; 127 128 /* regcache specific members */ 129 const struct regcache_ops *cache_ops; 130 enum regcache_type cache_type; 131 132 /* number of bytes in reg_defaults_raw */ 133 unsigned int cache_size_raw; 134 /* number of bytes per word in reg_defaults_raw */ 135 unsigned int cache_word_size; 136 /* number of entries in reg_defaults */ 137 unsigned int num_reg_defaults; 138 /* number of entries in reg_defaults_raw */ 139 unsigned int num_reg_defaults_raw; 140 141 /* if set, only the cache is modified not the HW */ 142 bool cache_only; 143 /* if set, only the HW is modified not the cache */ 144 bool cache_bypass; 145 /* if set, remember to free reg_defaults_raw */ 146 bool cache_free; 147 148 struct reg_default *reg_defaults; 149 const void *reg_defaults_raw; 150 void *cache; 151 /* if set, the cache contains newer data than the HW */ 152 bool cache_dirty; 153 /* if set, the HW registers are known to match map->reg_defaults */ 154 bool no_sync_defaults; 155 156 struct reg_sequence *patch; 157 int patch_regs; 158 159 /* if set, converts bulk read to single read */ 160 bool use_single_read; 161 /* if set, converts bulk write to single write */ 162 bool use_single_write; 163 /* if set, the device supports multi write mode */ 164 bool can_multi_write; 165 166 /* if set, raw reads/writes are limited to this size */ 167 size_t max_raw_read; 168 size_t max_raw_write; 169 170 struct rb_root range_tree; 171 void *selector_work_buf; /* Scratch buffer used for selector */ 172 173 struct hwspinlock *hwlock; 174 175 /* if set, the regmap core can sleep */ 176 bool can_sleep; 177 }; 178 179 struct regcache_ops { 180 const char *name; 181 enum regcache_type type; 182 int (*init)(struct regmap *map); 183 int (*exit)(struct regmap *map); 184 #ifdef CONFIG_DEBUG_FS 185 void (*debugfs_init)(struct regmap *map); 186 #endif 187 int (*read)(struct regmap *map, unsigned int reg, unsigned int *value); 188 int (*write)(struct regmap *map, unsigned int reg, unsigned int value); 189 int (*sync)(struct regmap *map, unsigned int min, unsigned int max); 190 int (*drop)(struct regmap *map, unsigned int min, unsigned int max); 191 }; 192 193 bool regmap_cached(struct regmap *map, unsigned int reg); 194 bool regmap_writeable(struct regmap *map, unsigned int reg); 195 bool regmap_readable(struct regmap *map, unsigned int reg); 196 bool regmap_volatile(struct regmap *map, unsigned int reg); 197 bool regmap_precious(struct regmap *map, unsigned int reg); 198 bool regmap_writeable_noinc(struct regmap *map, unsigned int reg); 199 bool regmap_readable_noinc(struct regmap *map, unsigned int reg); 200 201 int _regmap_write(struct regmap *map, unsigned int reg, 202 unsigned int val); 203 204 struct regmap_range_node { 205 struct rb_node node; 206 const char *name; 207 struct regmap *map; 208 209 unsigned int range_min; 210 unsigned int range_max; 211 212 unsigned int selector_reg; 213 unsigned int selector_mask; 214 int selector_shift; 215 216 unsigned int window_start; 217 unsigned int window_len; 218 }; 219 220 struct regmap_field { 221 struct regmap *regmap; 222 unsigned int mask; 223 /* lsb */ 224 unsigned int shift; 225 unsigned int reg; 226 227 unsigned int id_size; 228 unsigned int id_offset; 229 }; 230 231 #ifdef CONFIG_DEBUG_FS 232 extern void regmap_debugfs_initcall(void); 233 extern void regmap_debugfs_init(struct regmap *map); 234 extern void regmap_debugfs_exit(struct regmap *map); 235 236 static inline void regmap_debugfs_disable(struct regmap *map) 237 { 238 map->debugfs_disable = true; 239 } 240 241 #else 242 static inline void regmap_debugfs_initcall(void) { } 243 static inline void regmap_debugfs_init(struct regmap *map) { } 244 static inline void regmap_debugfs_exit(struct regmap *map) { } 245 static inline void regmap_debugfs_disable(struct regmap *map) { } 246 #endif 247 248 /* regcache core declarations */ 249 int regcache_init(struct regmap *map, const struct regmap_config *config); 250 void regcache_exit(struct regmap *map); 251 int regcache_read(struct regmap *map, 252 unsigned int reg, unsigned int *value); 253 int regcache_write(struct regmap *map, 254 unsigned int reg, unsigned int value); 255 int regcache_sync(struct regmap *map); 256 int regcache_sync_block(struct regmap *map, void *block, 257 unsigned long *cache_present, 258 unsigned int block_base, unsigned int start, 259 unsigned int end); 260 261 static inline const void *regcache_get_val_addr(struct regmap *map, 262 const void *base, 263 unsigned int idx) 264 { 265 return base + (map->cache_word_size * idx); 266 } 267 268 unsigned int regcache_get_val(struct regmap *map, const void *base, 269 unsigned int idx); 270 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx, 271 unsigned int val); 272 int regcache_lookup_reg(struct regmap *map, unsigned int reg); 273 274 int _regmap_raw_write(struct regmap *map, unsigned int reg, 275 const void *val, size_t val_len, bool noinc); 276 277 void regmap_async_complete_cb(struct regmap_async *async, int ret); 278 279 enum regmap_endian regmap_get_val_endian(struct device *dev, 280 const struct regmap_bus *bus, 281 const struct regmap_config *config); 282 283 extern struct regcache_ops regcache_rbtree_ops; 284 extern struct regcache_ops regcache_lzo_ops; 285 extern struct regcache_ops regcache_flat_ops; 286 287 static inline const char *regmap_name(const struct regmap *map) 288 { 289 if (map->dev) 290 return dev_name(map->dev); 291 292 return map->name; 293 } 294 295 static inline unsigned int regmap_get_offset(const struct regmap *map, 296 unsigned int index) 297 { 298 if (map->reg_stride_order >= 0) 299 return index << map->reg_stride_order; 300 else 301 return index * map->reg_stride; 302 } 303 304 static inline unsigned int regcache_get_index_by_order(const struct regmap *map, 305 unsigned int reg) 306 { 307 return reg >> map->reg_stride_order; 308 } 309 310 #endif 311