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 s8 reg_shift;
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 struct lock_class_key *lock_key;
63 regmap_lock lock;
64 regmap_unlock unlock;
65 void *lock_arg; /* This is passed to lock/unlock functions */
66 gfp_t alloc_flags;
67 unsigned int reg_base;
68
69 struct device *dev; /* Device we do I/O on */
70 void *work_buf; /* Scratch buffer used to format I/O */
71 struct regmap_format format; /* Buffer format */
72 const struct regmap_bus *bus;
73 void *bus_context;
74 const char *name;
75
76 bool async;
77 spinlock_t async_lock;
78 wait_queue_head_t async_waitq;
79 struct list_head async_list;
80 struct list_head async_free;
81 int async_ret;
82
83 #ifdef CONFIG_DEBUG_FS
84 bool debugfs_disable;
85 struct dentry *debugfs;
86 const char *debugfs_name;
87
88 unsigned int debugfs_reg_len;
89 unsigned int debugfs_val_len;
90 unsigned int debugfs_tot_len;
91
92 struct list_head debugfs_off_cache;
93 struct mutex cache_lock;
94 #endif
95
96 unsigned int max_register;
97 bool (*writeable_reg)(struct device *dev, unsigned int reg);
98 bool (*readable_reg)(struct device *dev, unsigned int reg);
99 bool (*volatile_reg)(struct device *dev, unsigned int reg);
100 bool (*precious_reg)(struct device *dev, unsigned int reg);
101 bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg);
102 bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
103 const struct regmap_access_table *wr_table;
104 const struct regmap_access_table *rd_table;
105 const struct regmap_access_table *volatile_table;
106 const struct regmap_access_table *precious_table;
107 const struct regmap_access_table *wr_noinc_table;
108 const struct regmap_access_table *rd_noinc_table;
109
110 int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
111 int (*reg_write)(void *context, unsigned int reg, unsigned int val);
112 int (*reg_update_bits)(void *context, unsigned int reg,
113 unsigned int mask, unsigned int val);
114 /* Bulk read/write */
115 int (*read)(void *context, const void *reg_buf, size_t reg_size,
116 void *val_buf, size_t val_size);
117 int (*write)(void *context, const void *data, size_t count);
118
119 bool defer_caching;
120
121 unsigned long read_flag_mask;
122 unsigned long write_flag_mask;
123
124 /* number of bits to (left) shift the reg value when formatting*/
125 int reg_shift;
126 int reg_stride;
127 int reg_stride_order;
128
129 /* If set, will always write field to HW. */
130 bool force_write_field;
131
132 /* regcache specific members */
133 const struct regcache_ops *cache_ops;
134 enum regcache_type cache_type;
135
136 /* number of bytes in reg_defaults_raw */
137 unsigned int cache_size_raw;
138 /* number of bytes per word in reg_defaults_raw */
139 unsigned int cache_word_size;
140 /* number of entries in reg_defaults */
141 unsigned int num_reg_defaults;
142 /* number of entries in reg_defaults_raw */
143 unsigned int num_reg_defaults_raw;
144
145 /* if set, only the cache is modified not the HW */
146 bool cache_only;
147 /* if set, only the HW is modified not the cache */
148 bool cache_bypass;
149 /* if set, remember to free reg_defaults_raw */
150 bool cache_free;
151
152 struct reg_default *reg_defaults;
153 const void *reg_defaults_raw;
154 void *cache;
155 /* if set, the cache contains newer data than the HW */
156 bool cache_dirty;
157 /* if set, the HW registers are known to match map->reg_defaults */
158 bool no_sync_defaults;
159
160 struct reg_sequence *patch;
161 int patch_regs;
162
163 /* if set, converts bulk read to single read */
164 bool use_single_read;
165 /* if set, converts bulk write to single write */
166 bool use_single_write;
167 /* if set, the device supports multi write mode */
168 bool can_multi_write;
169
170 /* if set, raw reads/writes are limited to this size */
171 size_t max_raw_read;
172 size_t max_raw_write;
173
174 struct rb_root range_tree;
175 void *selector_work_buf; /* Scratch buffer used for selector */
176
177 struct hwspinlock *hwlock;
178
179 /* if set, the regmap core can sleep */
180 bool can_sleep;
181 };
182
183 struct regcache_ops {
184 const char *name;
185 enum regcache_type type;
186 int (*init)(struct regmap *map);
187 int (*exit)(struct regmap *map);
188 #ifdef CONFIG_DEBUG_FS
189 void (*debugfs_init)(struct regmap *map);
190 #endif
191 int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
192 int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
193 int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
194 int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
195 };
196
197 bool regmap_cached(struct regmap *map, unsigned int reg);
198 bool regmap_writeable(struct regmap *map, unsigned int reg);
199 bool regmap_readable(struct regmap *map, unsigned int reg);
200 bool regmap_volatile(struct regmap *map, unsigned int reg);
201 bool regmap_precious(struct regmap *map, unsigned int reg);
202 bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
203 bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
204
205 int _regmap_write(struct regmap *map, unsigned int reg,
206 unsigned int val);
207
208 struct regmap_range_node {
209 struct rb_node node;
210 const char *name;
211 struct regmap *map;
212
213 unsigned int range_min;
214 unsigned int range_max;
215
216 unsigned int selector_reg;
217 unsigned int selector_mask;
218 int selector_shift;
219
220 unsigned int window_start;
221 unsigned int window_len;
222 };
223
224 struct regmap_field {
225 struct regmap *regmap;
226 unsigned int mask;
227 /* lsb */
228 unsigned int shift;
229 unsigned int reg;
230
231 unsigned int id_size;
232 unsigned int id_offset;
233 };
234
235 #ifdef CONFIG_DEBUG_FS
236 extern void regmap_debugfs_initcall(void);
237 extern void regmap_debugfs_init(struct regmap *map);
238 extern void regmap_debugfs_exit(struct regmap *map);
239
regmap_debugfs_disable(struct regmap * map)240 static inline void regmap_debugfs_disable(struct regmap *map)
241 {
242 map->debugfs_disable = true;
243 }
244
245 #else
regmap_debugfs_initcall(void)246 static inline void regmap_debugfs_initcall(void) { }
regmap_debugfs_init(struct regmap * map)247 static inline void regmap_debugfs_init(struct regmap *map) { }
regmap_debugfs_exit(struct regmap * map)248 static inline void regmap_debugfs_exit(struct regmap *map) { }
regmap_debugfs_disable(struct regmap * map)249 static inline void regmap_debugfs_disable(struct regmap *map) { }
250 #endif
251
252 /* regcache core declarations */
253 int regcache_init(struct regmap *map, const struct regmap_config *config);
254 void regcache_exit(struct regmap *map);
255 int regcache_read(struct regmap *map,
256 unsigned int reg, unsigned int *value);
257 int regcache_write(struct regmap *map,
258 unsigned int reg, unsigned int value);
259 int regcache_sync(struct regmap *map);
260 int regcache_sync_block(struct regmap *map, void *block,
261 unsigned long *cache_present,
262 unsigned int block_base, unsigned int start,
263 unsigned int end);
264 bool regcache_reg_needs_sync(struct regmap *map, unsigned int reg,
265 unsigned int val);
266
regcache_get_val_addr(struct regmap * map,const void * base,unsigned int idx)267 static inline const void *regcache_get_val_addr(struct regmap *map,
268 const void *base,
269 unsigned int idx)
270 {
271 return base + (map->cache_word_size * idx);
272 }
273
274 unsigned int regcache_get_val(struct regmap *map, const void *base,
275 unsigned int idx);
276 void regcache_set_val(struct regmap *map, void *base, unsigned int idx,
277 unsigned int val);
278 int regcache_lookup_reg(struct regmap *map, unsigned int reg);
279 int regcache_sync_val(struct regmap *map, unsigned int reg, unsigned int val);
280
281 int _regmap_raw_write(struct regmap *map, unsigned int reg,
282 const void *val, size_t val_len, bool noinc);
283
284 void regmap_async_complete_cb(struct regmap_async *async, int ret);
285
286 enum regmap_endian regmap_get_val_endian(struct device *dev,
287 const struct regmap_bus *bus,
288 const struct regmap_config *config);
289
290 extern struct regcache_ops regcache_rbtree_ops;
291 extern struct regcache_ops regcache_maple_ops;
292 extern struct regcache_ops regcache_flat_ops;
293
regmap_name(const struct regmap * map)294 static inline const char *regmap_name(const struct regmap *map)
295 {
296 if (map->dev)
297 return dev_name(map->dev);
298
299 return map->name;
300 }
301
regmap_get_offset(const struct regmap * map,unsigned int index)302 static inline unsigned int regmap_get_offset(const struct regmap *map,
303 unsigned int index)
304 {
305 if (map->reg_stride_order >= 0)
306 return index << map->reg_stride_order;
307 else
308 return index * map->reg_stride;
309 }
310
regcache_get_index_by_order(const struct regmap * map,unsigned int reg)311 static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
312 unsigned int reg)
313 {
314 return reg >> map->reg_stride_order;
315 }
316
317 struct regmap_ram_data {
318 unsigned int *vals; /* Allocatd by caller */
319 bool *read;
320 bool *written;
321 enum regmap_endian reg_endian;
322 };
323
324 /*
325 * Create a test register map with data stored in RAM, not intended
326 * for practical use.
327 */
328 struct regmap *__regmap_init_ram(const struct regmap_config *config,
329 struct regmap_ram_data *data,
330 struct lock_class_key *lock_key,
331 const char *lock_name);
332
333 #define regmap_init_ram(config, data) \
334 __regmap_lockdep_wrapper(__regmap_init_ram, #config, config, data)
335
336 struct regmap *__regmap_init_raw_ram(const struct regmap_config *config,
337 struct regmap_ram_data *data,
338 struct lock_class_key *lock_key,
339 const char *lock_name);
340
341 #define regmap_init_raw_ram(config, data) \
342 __regmap_lockdep_wrapper(__regmap_init_raw_ram, #config, config, data)
343
344 #endif
345