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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
19struct regmap;
20struct regcache_ops;
21
22struct 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
30struct 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
44struct regmap_async {
45 struct list_head list;
46 struct regmap *map;
47 void *work_buf;
48};
49
50struct 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 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 bool async;
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 max_register_is_set;
98 bool (*writeable_reg)(struct device *dev, unsigned int reg);
99 bool (*readable_reg)(struct device *dev, unsigned int reg);
100 bool (*volatile_reg)(struct device *dev, unsigned int reg);
101 bool (*precious_reg)(struct device *dev, unsigned int reg);
102 bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg);
103 bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
104 const struct regmap_access_table *wr_table;
105 const struct regmap_access_table *rd_table;
106 const struct regmap_access_table *volatile_table;
107 const struct regmap_access_table *precious_table;
108 const struct regmap_access_table *wr_noinc_table;
109 const struct regmap_access_table *rd_noinc_table;
110
111 int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
112 int (*reg_write)(void *context, unsigned int reg, unsigned int val);
113 int (*reg_update_bits)(void *context, unsigned int reg,
114 unsigned int mask, unsigned int val);
115 /* Bulk read/write */
116 int (*read)(void *context, const void *reg_buf, size_t reg_size,
117 void *val_buf, size_t val_size);
118 int (*write)(void *context, const void *data, size_t count);
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 bool defer_caching;
129
130 /* If set, will always write field to HW. */
131 bool force_write_field;
132
133 /* regcache specific members */
134 const struct regcache_ops *cache_ops;
135 enum regcache_type cache_type;
136
137 /* number of bytes in reg_defaults_raw */
138 unsigned int cache_size_raw;
139 /* number of bytes per word in reg_defaults_raw */
140 unsigned int cache_word_size;
141 /* number of entries in reg_defaults */
142 unsigned int num_reg_defaults;
143 /* number of entries in reg_defaults_raw */
144 unsigned int num_reg_defaults_raw;
145
146 /* if set, only the cache is modified not the HW */
147 bool cache_only;
148 /* if set, only the HW is modified not the cache */
149 bool cache_bypass;
150 /* if set, remember to free reg_defaults_raw */
151 bool cache_free;
152
153 struct reg_default *reg_defaults;
154 const void *reg_defaults_raw;
155 void *cache;
156 /* if set, the cache contains newer data than the HW */
157 bool cache_dirty;
158 /* if set, the HW registers are known to match map->reg_defaults */
159 bool no_sync_defaults;
160
161 struct reg_sequence *patch;
162 int patch_regs;
163
164 /* if set, the regmap core can sleep */
165 bool can_sleep;
166
167 /* if set, converts bulk read to single read */
168 bool use_single_read;
169 /* if set, converts bulk write to single write */
170 bool use_single_write;
171 /* if set, the device supports multi write mode */
172 bool can_multi_write;
173
174 /* if set, raw reads/writes are limited to this size */
175 size_t max_raw_read;
176 size_t max_raw_write;
177
178 struct rb_root range_tree;
179 void *selector_work_buf; /* Scratch buffer used for selector */
180
181 struct hwspinlock *hwlock;
182};
183
184struct regcache_ops {
185 const char *name;
186 enum regcache_type type;
187 int (*init)(struct regmap *map);
188 int (*exit)(struct regmap *map);
189#ifdef CONFIG_DEBUG_FS
190 void (*debugfs_init)(struct regmap *map);
191#endif
192 int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
193 int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
194 int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
195 int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
196};
197
198bool regmap_cached(struct regmap *map, unsigned int reg);
199bool regmap_writeable(struct regmap *map, unsigned int reg);
200bool regmap_readable(struct regmap *map, unsigned int reg);
201bool regmap_volatile(struct regmap *map, unsigned int reg);
202bool regmap_precious(struct regmap *map, unsigned int reg);
203bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
204bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
205
206int _regmap_write(struct regmap *map, unsigned int reg,
207 unsigned int val);
208
209struct regmap_range_node {
210 struct rb_node node;
211 const char *name;
212 struct regmap *map;
213
214 unsigned int range_min;
215 unsigned int range_max;
216
217 unsigned int selector_reg;
218 unsigned int selector_mask;
219 int selector_shift;
220
221 unsigned int window_start;
222 unsigned int window_len;
223};
224
225struct regmap_field {
226 struct regmap *regmap;
227 unsigned int mask;
228 /* lsb */
229 unsigned int shift;
230 unsigned int reg;
231
232 unsigned int id_size;
233 unsigned int id_offset;
234};
235
236#ifdef CONFIG_DEBUG_FS
237extern void regmap_debugfs_initcall(void);
238extern void regmap_debugfs_init(struct regmap *map);
239extern void regmap_debugfs_exit(struct regmap *map);
240
241static inline void regmap_debugfs_disable(struct regmap *map)
242{
243 map->debugfs_disable = true;
244}
245
246#else
247static inline void regmap_debugfs_initcall(void) { }
248static inline void regmap_debugfs_init(struct regmap *map) { }
249static inline void regmap_debugfs_exit(struct regmap *map) { }
250static inline void regmap_debugfs_disable(struct regmap *map) { }
251#endif
252
253/* regcache core declarations */
254int regcache_init(struct regmap *map, const struct regmap_config *config);
255void regcache_exit(struct regmap *map);
256int regcache_read(struct regmap *map,
257 unsigned int reg, unsigned int *value);
258int regcache_write(struct regmap *map,
259 unsigned int reg, unsigned int value);
260int regcache_sync(struct regmap *map);
261int regcache_sync_block(struct regmap *map, void *block,
262 unsigned long *cache_present,
263 unsigned int block_base, unsigned int start,
264 unsigned int end);
265bool regcache_reg_needs_sync(struct regmap *map, unsigned int reg,
266 unsigned int val);
267
268static inline const void *regcache_get_val_addr(struct regmap *map,
269 const void *base,
270 unsigned int idx)
271{
272 return base + (map->cache_word_size * idx);
273}
274
275unsigned int regcache_get_val(struct regmap *map, const void *base,
276 unsigned int idx);
277void regcache_set_val(struct regmap *map, void *base, unsigned int idx,
278 unsigned int val);
279int regcache_lookup_reg(struct regmap *map, unsigned int reg);
280int regcache_sync_val(struct regmap *map, unsigned int reg, unsigned int val);
281
282int _regmap_raw_write(struct regmap *map, unsigned int reg,
283 const void *val, size_t val_len, bool noinc);
284
285void regmap_async_complete_cb(struct regmap_async *async, int ret);
286
287enum regmap_endian regmap_get_val_endian(struct device *dev,
288 const struct regmap_bus *bus,
289 const struct regmap_config *config);
290
291extern struct regcache_ops regcache_rbtree_ops;
292extern struct regcache_ops regcache_maple_ops;
293extern struct regcache_ops regcache_flat_ops;
294
295static inline const char *regmap_name(const struct regmap *map)
296{
297 if (map->dev)
298 return dev_name(map->dev);
299
300 return map->name;
301}
302
303static inline unsigned int regmap_get_offset(const struct regmap *map,
304 unsigned int index)
305{
306 if (map->reg_stride_order >= 0)
307 return index << map->reg_stride_order;
308 else
309 return index * map->reg_stride;
310}
311
312static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
313 unsigned int reg)
314{
315 return reg >> map->reg_stride_order;
316}
317
318struct regmap_ram_data {
319 unsigned int *vals; /* Allocatd by caller */
320 bool *read;
321 bool *written;
322 enum regmap_endian reg_endian;
323 bool (*noinc_reg)(struct regmap_ram_data *data, unsigned int reg);
324};
325
326/*
327 * Create a test register map with data stored in RAM, not intended
328 * for practical use.
329 */
330struct regmap *__regmap_init_ram(struct device *dev,
331 const struct regmap_config *config,
332 struct regmap_ram_data *data,
333 struct lock_class_key *lock_key,
334 const char *lock_name);
335
336#define regmap_init_ram(dev, config, data) \
337 __regmap_lockdep_wrapper(__regmap_init_ram, #dev, dev, config, data)
338
339struct regmap *__regmap_init_raw_ram(struct device *dev,
340 const struct regmap_config *config,
341 struct regmap_ram_data *data,
342 struct lock_class_key *lock_key,
343 const char *lock_name);
344
345#define regmap_init_raw_ram(dev, config, data) \
346 __regmap_lockdep_wrapper(__regmap_init_raw_ram, #dev, dev, config, data)
347
348#endif