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 work_struct cleanup; 48 struct regmap *map; 49 void *work_buf; 50 }; 51 52 struct regmap { 53 struct mutex mutex; 54 spinlock_t spinlock; 55 unsigned long spinlock_flags; 56 regmap_lock lock; 57 regmap_unlock unlock; 58 void *lock_arg; /* This is passed to lock/unlock functions */ 59 60 struct device *dev; /* Device we do I/O on */ 61 void *work_buf; /* Scratch buffer used to format I/O */ 62 struct regmap_format format; /* Buffer format */ 63 const struct regmap_bus *bus; 64 void *bus_context; 65 const char *name; 66 67 spinlock_t async_lock; 68 wait_queue_head_t async_waitq; 69 struct list_head async_list; 70 int async_ret; 71 72 #ifdef CONFIG_DEBUG_FS 73 struct dentry *debugfs; 74 const char *debugfs_name; 75 76 unsigned int debugfs_reg_len; 77 unsigned int debugfs_val_len; 78 unsigned int debugfs_tot_len; 79 80 struct list_head debugfs_off_cache; 81 struct mutex cache_lock; 82 #endif 83 84 unsigned int max_register; 85 bool (*writeable_reg)(struct device *dev, unsigned int reg); 86 bool (*readable_reg)(struct device *dev, unsigned int reg); 87 bool (*volatile_reg)(struct device *dev, unsigned int reg); 88 bool (*precious_reg)(struct device *dev, unsigned int reg); 89 const struct regmap_access_table *wr_table; 90 const struct regmap_access_table *rd_table; 91 const struct regmap_access_table *volatile_table; 92 const struct regmap_access_table *precious_table; 93 94 int (*reg_read)(void *context, unsigned int reg, unsigned int *val); 95 int (*reg_write)(void *context, unsigned int reg, unsigned int val); 96 97 bool defer_caching; 98 99 u8 read_flag_mask; 100 u8 write_flag_mask; 101 102 /* number of bits to (left) shift the reg value when formatting*/ 103 int reg_shift; 104 int reg_stride; 105 106 /* regcache specific members */ 107 const struct regcache_ops *cache_ops; 108 enum regcache_type cache_type; 109 110 /* number of bytes in reg_defaults_raw */ 111 unsigned int cache_size_raw; 112 /* number of bytes per word in reg_defaults_raw */ 113 unsigned int cache_word_size; 114 /* number of entries in reg_defaults */ 115 unsigned int num_reg_defaults; 116 /* number of entries in reg_defaults_raw */ 117 unsigned int num_reg_defaults_raw; 118 119 /* if set, only the cache is modified not the HW */ 120 u32 cache_only; 121 /* if set, only the HW is modified not the cache */ 122 u32 cache_bypass; 123 /* if set, remember to free reg_defaults_raw */ 124 bool cache_free; 125 126 struct reg_default *reg_defaults; 127 const void *reg_defaults_raw; 128 void *cache; 129 u32 cache_dirty; 130 131 unsigned long *cache_present; 132 unsigned int cache_present_nbits; 133 134 struct reg_default *patch; 135 int patch_regs; 136 137 /* if set, converts bulk rw to single rw */ 138 bool use_single_rw; 139 140 struct rb_root range_tree; 141 void *selector_work_buf; /* Scratch buffer used for selector */ 142 }; 143 144 struct regcache_ops { 145 const char *name; 146 enum regcache_type type; 147 int (*init)(struct regmap *map); 148 int (*exit)(struct regmap *map); 149 int (*read)(struct regmap *map, unsigned int reg, unsigned int *value); 150 int (*write)(struct regmap *map, unsigned int reg, unsigned int value); 151 int (*sync)(struct regmap *map, unsigned int min, unsigned int max); 152 int (*drop)(struct regmap *map, unsigned int min, unsigned int max); 153 }; 154 155 bool regmap_writeable(struct regmap *map, unsigned int reg); 156 bool regmap_readable(struct regmap *map, unsigned int reg); 157 bool regmap_volatile(struct regmap *map, unsigned int reg); 158 bool regmap_precious(struct regmap *map, unsigned int reg); 159 160 int _regmap_write(struct regmap *map, unsigned int reg, 161 unsigned int val); 162 163 struct regmap_range_node { 164 struct rb_node node; 165 const char *name; 166 struct regmap *map; 167 168 unsigned int range_min; 169 unsigned int range_max; 170 171 unsigned int selector_reg; 172 unsigned int selector_mask; 173 int selector_shift; 174 175 unsigned int window_start; 176 unsigned int window_len; 177 }; 178 179 struct regmap_field { 180 struct regmap *regmap; 181 unsigned int mask; 182 /* lsb */ 183 unsigned int shift; 184 unsigned int reg; 185 }; 186 187 #ifdef CONFIG_DEBUG_FS 188 extern void regmap_debugfs_initcall(void); 189 extern void regmap_debugfs_init(struct regmap *map, const char *name); 190 extern void regmap_debugfs_exit(struct regmap *map); 191 #else 192 static inline void regmap_debugfs_initcall(void) { } 193 static inline void regmap_debugfs_init(struct regmap *map, const char *name) { } 194 static inline void regmap_debugfs_exit(struct regmap *map) { } 195 #endif 196 197 /* regcache core declarations */ 198 int regcache_init(struct regmap *map, const struct regmap_config *config); 199 void regcache_exit(struct regmap *map); 200 int regcache_read(struct regmap *map, 201 unsigned int reg, unsigned int *value); 202 int regcache_write(struct regmap *map, 203 unsigned int reg, unsigned int value); 204 int regcache_sync(struct regmap *map); 205 int regcache_sync_block(struct regmap *map, void *block, 206 unsigned int block_base, unsigned int start, 207 unsigned int end); 208 209 static inline const void *regcache_get_val_addr(struct regmap *map, 210 const void *base, 211 unsigned int idx) 212 { 213 return base + (map->cache_word_size * idx); 214 } 215 216 unsigned int regcache_get_val(struct regmap *map, const void *base, 217 unsigned int idx); 218 bool regcache_set_val(struct regmap *map, void *base, unsigned int idx, 219 unsigned int val); 220 int regcache_lookup_reg(struct regmap *map, unsigned int reg); 221 int regcache_set_reg_present(struct regmap *map, unsigned int reg); 222 223 static inline bool regcache_reg_present(struct regmap *map, unsigned int reg) 224 { 225 if (!map->cache_present) 226 return true; 227 if (reg > map->cache_present_nbits) 228 return false; 229 return map->cache_present[BIT_WORD(reg)] & BIT_MASK(reg); 230 } 231 232 int _regmap_raw_write(struct regmap *map, unsigned int reg, 233 const void *val, size_t val_len, bool async); 234 235 void regmap_async_complete_cb(struct regmap_async *async, int ret); 236 237 extern struct regcache_ops regcache_rbtree_ops; 238 extern struct regcache_ops regcache_lzo_ops; 239 extern struct regcache_ops regcache_flat_ops; 240 241 #endif 242