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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 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
43struct regmap_async {
44 struct list_head list;
45 struct regmap *map;
46 void *work_buf;
47};
48
49struct 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
166struct 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
180bool regmap_cached(struct regmap *map, unsigned int reg);
181bool regmap_writeable(struct regmap *map, unsigned int reg);
182bool regmap_readable(struct regmap *map, unsigned int reg);
183bool regmap_volatile(struct regmap *map, unsigned int reg);
184bool regmap_precious(struct regmap *map, unsigned int reg);
185bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
186bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
187
188int _regmap_write(struct regmap *map, unsigned int reg,
189 unsigned int val);
190
191struct 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
207struct 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
219extern void regmap_debugfs_initcall(void);
220extern void regmap_debugfs_init(struct regmap *map, const char *name);
221extern void regmap_debugfs_exit(struct regmap *map);
222
223static inline void regmap_debugfs_disable(struct regmap *map)
224{
225 map->debugfs_disable = true;
226}
227
228#else
229static inline void regmap_debugfs_initcall(void) { }
230static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
231static inline void regmap_debugfs_exit(struct regmap *map) { }
232static inline void regmap_debugfs_disable(struct regmap *map) { }
233#endif
234
235/* regcache core declarations */
236int regcache_init(struct regmap *map, const struct regmap_config *config);
237void regcache_exit(struct regmap *map);
238int regcache_read(struct regmap *map,
239 unsigned int reg, unsigned int *value);
240int regcache_write(struct regmap *map,
241 unsigned int reg, unsigned int value);
242int regcache_sync(struct regmap *map);
243int 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
248static 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
255unsigned int regcache_get_val(struct regmap *map, const void *base,
256 unsigned int idx);
257bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
258 unsigned int val);
259int regcache_lookup_reg(struct regmap *map, unsigned int reg);
260
261int _regmap_raw_write(struct regmap *map, unsigned int reg,
262 const void *val, size_t val_len);
263
264void regmap_async_complete_cb(struct regmap_async *async, int ret);
265
266enum regmap_endian regmap_get_val_endian(struct device *dev,
267 const struct regmap_bus *bus,
268 const struct regmap_config *config);
269
270extern struct regcache_ops regcache_rbtree_ops;
271extern struct regcache_ops regcache_lzo_ops;
272extern struct regcache_ops regcache_flat_ops;
273
274static 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
282static 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
291static 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