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1/*
2 * Register map access API
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#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/mutex.h>
16#include <linux/err.h>
17
18#include <linux/regmap.h>
19
20struct regmap;
21
22struct regmap_format {
23 size_t buf_size;
24 size_t reg_bytes;
25 size_t val_bytes;
26 void (*format_write)(struct regmap *map,
27 unsigned int reg, unsigned int val);
28 void (*format_reg)(void *buf, unsigned int reg);
29 void (*format_val)(void *buf, unsigned int val);
30 unsigned int (*parse_val)(void *buf);
31};
32
33struct regmap {
34 struct mutex lock;
35
36 struct device *dev; /* Device we do I/O on */
37 void *work_buf; /* Scratch buffer used to format I/O */
38 struct regmap_format format; /* Buffer format */
39 const struct regmap_bus *bus;
40};
41
42static void regmap_format_4_12_write(struct regmap *map,
43 unsigned int reg, unsigned int val)
44{
45 __be16 *out = map->work_buf;
46 *out = cpu_to_be16((reg << 12) | val);
47}
48
49static void regmap_format_7_9_write(struct regmap *map,
50 unsigned int reg, unsigned int val)
51{
52 __be16 *out = map->work_buf;
53 *out = cpu_to_be16((reg << 9) | val);
54}
55
56static void regmap_format_8(void *buf, unsigned int val)
57{
58 u8 *b = buf;
59
60 b[0] = val;
61}
62
63static void regmap_format_16(void *buf, unsigned int val)
64{
65 __be16 *b = buf;
66
67 b[0] = cpu_to_be16(val);
68}
69
70static unsigned int regmap_parse_8(void *buf)
71{
72 u8 *b = buf;
73
74 return b[0];
75}
76
77static unsigned int regmap_parse_16(void *buf)
78{
79 __be16 *b = buf;
80
81 b[0] = be16_to_cpu(b[0]);
82
83 return b[0];
84}
85
86/**
87 * regmap_init(): Initialise register map
88 *
89 * @dev: Device that will be interacted with
90 * @bus: Bus-specific callbacks to use with device
91 * @config: Configuration for register map
92 *
93 * The return value will be an ERR_PTR() on error or a valid pointer to
94 * a struct regmap. This function should generally not be called
95 * directly, it should be called by bus-specific init functions.
96 */
97struct regmap *regmap_init(struct device *dev,
98 const struct regmap_bus *bus,
99 const struct regmap_config *config)
100{
101 struct regmap *map;
102 int ret = -EINVAL;
103
104 if (!bus || !config)
105 return NULL;
106
107 map = kzalloc(sizeof(*map), GFP_KERNEL);
108 if (map == NULL) {
109 ret = -ENOMEM;
110 goto err;
111 }
112
113 mutex_init(&map->lock);
114 map->format.buf_size = (config->reg_bits + config->val_bits) / 8;
115 map->format.reg_bytes = config->reg_bits / 8;
116 map->format.val_bytes = config->val_bits / 8;
117 map->dev = dev;
118 map->bus = bus;
119
120 switch (config->reg_bits) {
121 case 4:
122 switch (config->val_bits) {
123 case 12:
124 map->format.format_write = regmap_format_4_12_write;
125 break;
126 default:
127 goto err_map;
128 }
129 break;
130
131 case 7:
132 switch (config->val_bits) {
133 case 9:
134 map->format.format_write = regmap_format_7_9_write;
135 break;
136 default:
137 goto err_map;
138 }
139 break;
140
141 case 8:
142 map->format.format_reg = regmap_format_8;
143 break;
144
145 case 16:
146 map->format.format_reg = regmap_format_16;
147 break;
148
149 default:
150 goto err_map;
151 }
152
153 switch (config->val_bits) {
154 case 8:
155 map->format.format_val = regmap_format_8;
156 map->format.parse_val = regmap_parse_8;
157 break;
158 case 16:
159 map->format.format_val = regmap_format_16;
160 map->format.parse_val = regmap_parse_16;
161 break;
162 }
163
164 if (!map->format.format_write &&
165 !(map->format.format_reg && map->format.format_val))
166 goto err_map;
167
168 map->work_buf = kmalloc(map->format.buf_size, GFP_KERNEL);
169 if (map->work_buf == NULL) {
170 ret = -ENOMEM;
171 goto err_map;
172 }
173
174 return map;
175
176err_map:
177 kfree(map);
178err:
179 return ERR_PTR(ret);
180}
181EXPORT_SYMBOL_GPL(regmap_init);
182
183/**
184 * regmap_exit(): Free a previously allocated register map
185 */
186void regmap_exit(struct regmap *map)
187{
188 kfree(map->work_buf);
189 kfree(map);
190}
191EXPORT_SYMBOL_GPL(regmap_exit);
192
193static int _regmap_raw_write(struct regmap *map, unsigned int reg,
194 const void *val, size_t val_len)
195{
196 void *buf;
197 int ret = -ENOTSUPP;
198 size_t len;
199
200 map->format.format_reg(map->work_buf, reg);
201
202 /* Try to do a gather write if we can */
203 if (map->bus->gather_write)
204 ret = map->bus->gather_write(map->dev, map->work_buf,
205 map->format.reg_bytes,
206 val, val_len);
207
208 /* Otherwise fall back on linearising by hand. */
209 if (ret == -ENOTSUPP) {
210 len = map->format.reg_bytes + val_len;
211 buf = kmalloc(len, GFP_KERNEL);
212 if (!buf)
213 return -ENOMEM;
214
215 memcpy(buf, map->work_buf, map->format.reg_bytes);
216 memcpy(buf + map->format.reg_bytes, val, val_len);
217 ret = map->bus->write(map->dev, buf, len);
218
219 kfree(buf);
220 }
221
222 return ret;
223}
224
225static int _regmap_write(struct regmap *map, unsigned int reg,
226 unsigned int val)
227{
228 BUG_ON(!map->format.format_write && !map->format.format_val);
229
230 if (map->format.format_write) {
231 map->format.format_write(map, reg, val);
232
233 return map->bus->write(map->dev, map->work_buf,
234 map->format.buf_size);
235 } else {
236 map->format.format_val(map->work_buf + map->format.reg_bytes,
237 val);
238 return _regmap_raw_write(map, reg,
239 map->work_buf + map->format.reg_bytes,
240 map->format.val_bytes);
241 }
242}
243
244/**
245 * regmap_write(): Write a value to a single register
246 *
247 * @map: Register map to write to
248 * @reg: Register to write to
249 * @val: Value to be written
250 *
251 * A value of zero will be returned on success, a negative errno will
252 * be returned in error cases.
253 */
254int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
255{
256 int ret;
257
258 mutex_lock(&map->lock);
259
260 ret = _regmap_write(map, reg, val);
261
262 mutex_unlock(&map->lock);
263
264 return ret;
265}
266EXPORT_SYMBOL_GPL(regmap_write);
267
268/**
269 * regmap_raw_write(): Write raw values to one or more registers
270 *
271 * @map: Register map to write to
272 * @reg: Initial register to write to
273 * @val: Block of data to be written, laid out for direct transmission to the
274 * device
275 * @val_len: Length of data pointed to by val.
276 *
277 * This function is intended to be used for things like firmware
278 * download where a large block of data needs to be transferred to the
279 * device. No formatting will be done on the data provided.
280 *
281 * A value of zero will be returned on success, a negative errno will
282 * be returned in error cases.
283 */
284int regmap_raw_write(struct regmap *map, unsigned int reg,
285 const void *val, size_t val_len)
286{
287 int ret;
288
289 mutex_lock(&map->lock);
290
291 ret = _regmap_raw_write(map, reg, val, val_len);
292
293 mutex_unlock(&map->lock);
294
295 return ret;
296}
297EXPORT_SYMBOL_GPL(regmap_raw_write);
298
299static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
300 unsigned int val_len)
301{
302 u8 *u8 = map->work_buf;
303 int ret;
304
305 map->format.format_reg(map->work_buf, reg);
306
307 /*
308 * Some buses flag reads by setting the high bits in the
309 * register addresss; since it's always the high bits for all
310 * current formats we can do this here rather than in
311 * formatting. This may break if we get interesting formats.
312 */
313 if (map->bus->read_flag_mask)
314 u8[0] |= map->bus->read_flag_mask;
315
316 ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes,
317 val, val_len);
318 if (ret != 0)
319 return ret;
320
321 return 0;
322}
323
324static int _regmap_read(struct regmap *map, unsigned int reg,
325 unsigned int *val)
326{
327 int ret;
328
329 if (!map->format.parse_val)
330 return -EINVAL;
331
332 ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
333 if (ret == 0)
334 *val = map->format.parse_val(map->work_buf);
335
336 return ret;
337}
338
339/**
340 * regmap_read(): Read a value from a single register
341 *
342 * @map: Register map to write to
343 * @reg: Register to be read from
344 * @val: Pointer to store read value
345 *
346 * A value of zero will be returned on success, a negative errno will
347 * be returned in error cases.
348 */
349int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
350{
351 int ret;
352
353 mutex_lock(&map->lock);
354
355 ret = _regmap_read(map, reg, val);
356
357 mutex_unlock(&map->lock);
358
359 return ret;
360}
361EXPORT_SYMBOL_GPL(regmap_read);
362
363/**
364 * regmap_raw_read(): Read raw data from the device
365 *
366 * @map: Register map to write to
367 * @reg: First register to be read from
368 * @val: Pointer to store read value
369 * @val_len: Size of data to read
370 *
371 * A value of zero will be returned on success, a negative errno will
372 * be returned in error cases.
373 */
374int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
375 size_t val_len)
376{
377 int ret;
378
379 mutex_lock(&map->lock);
380
381 ret = _regmap_raw_read(map, reg, val, val_len);
382
383 mutex_unlock(&map->lock);
384
385 return ret;
386}
387EXPORT_SYMBOL_GPL(regmap_raw_read);
388
389/**
390 * regmap_bulk_read(): Read multiple registers from the device
391 *
392 * @map: Register map to write to
393 * @reg: First register to be read from
394 * @val: Pointer to store read value, in native register size for device
395 * @val_count: Number of registers to read
396 *
397 * A value of zero will be returned on success, a negative errno will
398 * be returned in error cases.
399 */
400int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
401 size_t val_count)
402{
403 int ret, i;
404 size_t val_bytes = map->format.val_bytes;
405
406 if (!map->format.parse_val)
407 return -EINVAL;
408
409 ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
410 if (ret != 0)
411 return ret;
412
413 for (i = 0; i < val_count * val_bytes; i += val_bytes)
414 map->format.parse_val(val + i);
415
416 return 0;
417}
418EXPORT_SYMBOL_GPL(regmap_bulk_read);
419
420/**
421 * remap_update_bits: Perform a read/modify/write cycle on the register map
422 *
423 * @map: Register map to update
424 * @reg: Register to update
425 * @mask: Bitmask to change
426 * @val: New value for bitmask
427 *
428 * Returns zero for success, a negative number on error.
429 */
430int regmap_update_bits(struct regmap *map, unsigned int reg,
431 unsigned int mask, unsigned int val)
432{
433 int ret;
434 unsigned int tmp;
435
436 mutex_lock(&map->lock);
437
438 ret = _regmap_read(map, reg, &tmp);
439 if (ret != 0)
440 goto out;
441
442 tmp &= ~mask;
443 tmp |= val & mask;
444
445 ret = _regmap_write(map, reg, tmp);
446
447out:
448 mutex_unlock(&map->lock);
449
450 return ret;
451}
452EXPORT_SYMBOL_GPL(regmap_update_bits);
1/*
2 * Register map access API
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#include <linux/device.h>
14#include <linux/slab.h>
15#include <linux/export.h>
16#include <linux/mutex.h>
17#include <linux/err.h>
18#include <linux/of.h>
19#include <linux/rbtree.h>
20#include <linux/sched.h>
21#include <linux/delay.h>
22#include <linux/log2.h>
23#include <linux/hwspinlock.h>
24
25#define CREATE_TRACE_POINTS
26#include "trace.h"
27
28#include "internal.h"
29
30/*
31 * Sometimes for failures during very early init the trace
32 * infrastructure isn't available early enough to be used. For this
33 * sort of problem defining LOG_DEVICE will add printks for basic
34 * register I/O on a specific device.
35 */
36#undef LOG_DEVICE
37
38static int _regmap_update_bits(struct regmap *map, unsigned int reg,
39 unsigned int mask, unsigned int val,
40 bool *change, bool force_write);
41
42static int _regmap_bus_reg_read(void *context, unsigned int reg,
43 unsigned int *val);
44static int _regmap_bus_read(void *context, unsigned int reg,
45 unsigned int *val);
46static int _regmap_bus_formatted_write(void *context, unsigned int reg,
47 unsigned int val);
48static int _regmap_bus_reg_write(void *context, unsigned int reg,
49 unsigned int val);
50static int _regmap_bus_raw_write(void *context, unsigned int reg,
51 unsigned int val);
52
53bool regmap_reg_in_ranges(unsigned int reg,
54 const struct regmap_range *ranges,
55 unsigned int nranges)
56{
57 const struct regmap_range *r;
58 int i;
59
60 for (i = 0, r = ranges; i < nranges; i++, r++)
61 if (regmap_reg_in_range(reg, r))
62 return true;
63 return false;
64}
65EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
66
67bool regmap_check_range_table(struct regmap *map, unsigned int reg,
68 const struct regmap_access_table *table)
69{
70 /* Check "no ranges" first */
71 if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
72 return false;
73
74 /* In case zero "yes ranges" are supplied, any reg is OK */
75 if (!table->n_yes_ranges)
76 return true;
77
78 return regmap_reg_in_ranges(reg, table->yes_ranges,
79 table->n_yes_ranges);
80}
81EXPORT_SYMBOL_GPL(regmap_check_range_table);
82
83bool regmap_writeable(struct regmap *map, unsigned int reg)
84{
85 if (map->max_register && reg > map->max_register)
86 return false;
87
88 if (map->writeable_reg)
89 return map->writeable_reg(map->dev, reg);
90
91 if (map->wr_table)
92 return regmap_check_range_table(map, reg, map->wr_table);
93
94 return true;
95}
96
97bool regmap_cached(struct regmap *map, unsigned int reg)
98{
99 int ret;
100 unsigned int val;
101
102 if (map->cache_type == REGCACHE_NONE)
103 return false;
104
105 if (!map->cache_ops)
106 return false;
107
108 if (map->max_register && reg > map->max_register)
109 return false;
110
111 map->lock(map->lock_arg);
112 ret = regcache_read(map, reg, &val);
113 map->unlock(map->lock_arg);
114 if (ret)
115 return false;
116
117 return true;
118}
119
120bool regmap_readable(struct regmap *map, unsigned int reg)
121{
122 if (!map->reg_read)
123 return false;
124
125 if (map->max_register && reg > map->max_register)
126 return false;
127
128 if (map->format.format_write)
129 return false;
130
131 if (map->readable_reg)
132 return map->readable_reg(map->dev, reg);
133
134 if (map->rd_table)
135 return regmap_check_range_table(map, reg, map->rd_table);
136
137 return true;
138}
139
140bool regmap_volatile(struct regmap *map, unsigned int reg)
141{
142 if (!map->format.format_write && !regmap_readable(map, reg))
143 return false;
144
145 if (map->volatile_reg)
146 return map->volatile_reg(map->dev, reg);
147
148 if (map->volatile_table)
149 return regmap_check_range_table(map, reg, map->volatile_table);
150
151 if (map->cache_ops)
152 return false;
153 else
154 return true;
155}
156
157bool regmap_precious(struct regmap *map, unsigned int reg)
158{
159 if (!regmap_readable(map, reg))
160 return false;
161
162 if (map->precious_reg)
163 return map->precious_reg(map->dev, reg);
164
165 if (map->precious_table)
166 return regmap_check_range_table(map, reg, map->precious_table);
167
168 return false;
169}
170
171static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
172 size_t num)
173{
174 unsigned int i;
175
176 for (i = 0; i < num; i++)
177 if (!regmap_volatile(map, reg + regmap_get_offset(map, i)))
178 return false;
179
180 return true;
181}
182
183static void regmap_format_2_6_write(struct regmap *map,
184 unsigned int reg, unsigned int val)
185{
186 u8 *out = map->work_buf;
187
188 *out = (reg << 6) | val;
189}
190
191static void regmap_format_4_12_write(struct regmap *map,
192 unsigned int reg, unsigned int val)
193{
194 __be16 *out = map->work_buf;
195 *out = cpu_to_be16((reg << 12) | val);
196}
197
198static void regmap_format_7_9_write(struct regmap *map,
199 unsigned int reg, unsigned int val)
200{
201 __be16 *out = map->work_buf;
202 *out = cpu_to_be16((reg << 9) | val);
203}
204
205static void regmap_format_10_14_write(struct regmap *map,
206 unsigned int reg, unsigned int val)
207{
208 u8 *out = map->work_buf;
209
210 out[2] = val;
211 out[1] = (val >> 8) | (reg << 6);
212 out[0] = reg >> 2;
213}
214
215static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
216{
217 u8 *b = buf;
218
219 b[0] = val << shift;
220}
221
222static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
223{
224 __be16 *b = buf;
225
226 b[0] = cpu_to_be16(val << shift);
227}
228
229static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
230{
231 __le16 *b = buf;
232
233 b[0] = cpu_to_le16(val << shift);
234}
235
236static void regmap_format_16_native(void *buf, unsigned int val,
237 unsigned int shift)
238{
239 *(u16 *)buf = val << shift;
240}
241
242static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
243{
244 u8 *b = buf;
245
246 val <<= shift;
247
248 b[0] = val >> 16;
249 b[1] = val >> 8;
250 b[2] = val;
251}
252
253static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
254{
255 __be32 *b = buf;
256
257 b[0] = cpu_to_be32(val << shift);
258}
259
260static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
261{
262 __le32 *b = buf;
263
264 b[0] = cpu_to_le32(val << shift);
265}
266
267static void regmap_format_32_native(void *buf, unsigned int val,
268 unsigned int shift)
269{
270 *(u32 *)buf = val << shift;
271}
272
273#ifdef CONFIG_64BIT
274static void regmap_format_64_be(void *buf, unsigned int val, unsigned int shift)
275{
276 __be64 *b = buf;
277
278 b[0] = cpu_to_be64((u64)val << shift);
279}
280
281static void regmap_format_64_le(void *buf, unsigned int val, unsigned int shift)
282{
283 __le64 *b = buf;
284
285 b[0] = cpu_to_le64((u64)val << shift);
286}
287
288static void regmap_format_64_native(void *buf, unsigned int val,
289 unsigned int shift)
290{
291 *(u64 *)buf = (u64)val << shift;
292}
293#endif
294
295static void regmap_parse_inplace_noop(void *buf)
296{
297}
298
299static unsigned int regmap_parse_8(const void *buf)
300{
301 const u8 *b = buf;
302
303 return b[0];
304}
305
306static unsigned int regmap_parse_16_be(const void *buf)
307{
308 const __be16 *b = buf;
309
310 return be16_to_cpu(b[0]);
311}
312
313static unsigned int regmap_parse_16_le(const void *buf)
314{
315 const __le16 *b = buf;
316
317 return le16_to_cpu(b[0]);
318}
319
320static void regmap_parse_16_be_inplace(void *buf)
321{
322 __be16 *b = buf;
323
324 b[0] = be16_to_cpu(b[0]);
325}
326
327static void regmap_parse_16_le_inplace(void *buf)
328{
329 __le16 *b = buf;
330
331 b[0] = le16_to_cpu(b[0]);
332}
333
334static unsigned int regmap_parse_16_native(const void *buf)
335{
336 return *(u16 *)buf;
337}
338
339static unsigned int regmap_parse_24(const void *buf)
340{
341 const u8 *b = buf;
342 unsigned int ret = b[2];
343 ret |= ((unsigned int)b[1]) << 8;
344 ret |= ((unsigned int)b[0]) << 16;
345
346 return ret;
347}
348
349static unsigned int regmap_parse_32_be(const void *buf)
350{
351 const __be32 *b = buf;
352
353 return be32_to_cpu(b[0]);
354}
355
356static unsigned int regmap_parse_32_le(const void *buf)
357{
358 const __le32 *b = buf;
359
360 return le32_to_cpu(b[0]);
361}
362
363static void regmap_parse_32_be_inplace(void *buf)
364{
365 __be32 *b = buf;
366
367 b[0] = be32_to_cpu(b[0]);
368}
369
370static void regmap_parse_32_le_inplace(void *buf)
371{
372 __le32 *b = buf;
373
374 b[0] = le32_to_cpu(b[0]);
375}
376
377static unsigned int regmap_parse_32_native(const void *buf)
378{
379 return *(u32 *)buf;
380}
381
382#ifdef CONFIG_64BIT
383static unsigned int regmap_parse_64_be(const void *buf)
384{
385 const __be64 *b = buf;
386
387 return be64_to_cpu(b[0]);
388}
389
390static unsigned int regmap_parse_64_le(const void *buf)
391{
392 const __le64 *b = buf;
393
394 return le64_to_cpu(b[0]);
395}
396
397static void regmap_parse_64_be_inplace(void *buf)
398{
399 __be64 *b = buf;
400
401 b[0] = be64_to_cpu(b[0]);
402}
403
404static void regmap_parse_64_le_inplace(void *buf)
405{
406 __le64 *b = buf;
407
408 b[0] = le64_to_cpu(b[0]);
409}
410
411static unsigned int regmap_parse_64_native(const void *buf)
412{
413 return *(u64 *)buf;
414}
415#endif
416
417static void regmap_lock_hwlock(void *__map)
418{
419 struct regmap *map = __map;
420
421 hwspin_lock_timeout(map->hwlock, UINT_MAX);
422}
423
424static void regmap_lock_hwlock_irq(void *__map)
425{
426 struct regmap *map = __map;
427
428 hwspin_lock_timeout_irq(map->hwlock, UINT_MAX);
429}
430
431static void regmap_lock_hwlock_irqsave(void *__map)
432{
433 struct regmap *map = __map;
434
435 hwspin_lock_timeout_irqsave(map->hwlock, UINT_MAX,
436 &map->spinlock_flags);
437}
438
439static void regmap_unlock_hwlock(void *__map)
440{
441 struct regmap *map = __map;
442
443 hwspin_unlock(map->hwlock);
444}
445
446static void regmap_unlock_hwlock_irq(void *__map)
447{
448 struct regmap *map = __map;
449
450 hwspin_unlock_irq(map->hwlock);
451}
452
453static void regmap_unlock_hwlock_irqrestore(void *__map)
454{
455 struct regmap *map = __map;
456
457 hwspin_unlock_irqrestore(map->hwlock, &map->spinlock_flags);
458}
459
460static void regmap_lock_unlock_none(void *__map)
461{
462
463}
464
465static void regmap_lock_mutex(void *__map)
466{
467 struct regmap *map = __map;
468 mutex_lock(&map->mutex);
469}
470
471static void regmap_unlock_mutex(void *__map)
472{
473 struct regmap *map = __map;
474 mutex_unlock(&map->mutex);
475}
476
477static void regmap_lock_spinlock(void *__map)
478__acquires(&map->spinlock)
479{
480 struct regmap *map = __map;
481 unsigned long flags;
482
483 spin_lock_irqsave(&map->spinlock, flags);
484 map->spinlock_flags = flags;
485}
486
487static void regmap_unlock_spinlock(void *__map)
488__releases(&map->spinlock)
489{
490 struct regmap *map = __map;
491 spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
492}
493
494static void dev_get_regmap_release(struct device *dev, void *res)
495{
496 /*
497 * We don't actually have anything to do here; the goal here
498 * is not to manage the regmap but to provide a simple way to
499 * get the regmap back given a struct device.
500 */
501}
502
503static bool _regmap_range_add(struct regmap *map,
504 struct regmap_range_node *data)
505{
506 struct rb_root *root = &map->range_tree;
507 struct rb_node **new = &(root->rb_node), *parent = NULL;
508
509 while (*new) {
510 struct regmap_range_node *this =
511 rb_entry(*new, struct regmap_range_node, node);
512
513 parent = *new;
514 if (data->range_max < this->range_min)
515 new = &((*new)->rb_left);
516 else if (data->range_min > this->range_max)
517 new = &((*new)->rb_right);
518 else
519 return false;
520 }
521
522 rb_link_node(&data->node, parent, new);
523 rb_insert_color(&data->node, root);
524
525 return true;
526}
527
528static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
529 unsigned int reg)
530{
531 struct rb_node *node = map->range_tree.rb_node;
532
533 while (node) {
534 struct regmap_range_node *this =
535 rb_entry(node, struct regmap_range_node, node);
536
537 if (reg < this->range_min)
538 node = node->rb_left;
539 else if (reg > this->range_max)
540 node = node->rb_right;
541 else
542 return this;
543 }
544
545 return NULL;
546}
547
548static void regmap_range_exit(struct regmap *map)
549{
550 struct rb_node *next;
551 struct regmap_range_node *range_node;
552
553 next = rb_first(&map->range_tree);
554 while (next) {
555 range_node = rb_entry(next, struct regmap_range_node, node);
556 next = rb_next(&range_node->node);
557 rb_erase(&range_node->node, &map->range_tree);
558 kfree(range_node);
559 }
560
561 kfree(map->selector_work_buf);
562}
563
564int regmap_attach_dev(struct device *dev, struct regmap *map,
565 const struct regmap_config *config)
566{
567 struct regmap **m;
568
569 map->dev = dev;
570
571 regmap_debugfs_init(map, config->name);
572
573 /* Add a devres resource for dev_get_regmap() */
574 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
575 if (!m) {
576 regmap_debugfs_exit(map);
577 return -ENOMEM;
578 }
579 *m = map;
580 devres_add(dev, m);
581
582 return 0;
583}
584EXPORT_SYMBOL_GPL(regmap_attach_dev);
585
586static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
587 const struct regmap_config *config)
588{
589 enum regmap_endian endian;
590
591 /* Retrieve the endianness specification from the regmap config */
592 endian = config->reg_format_endian;
593
594 /* If the regmap config specified a non-default value, use that */
595 if (endian != REGMAP_ENDIAN_DEFAULT)
596 return endian;
597
598 /* Retrieve the endianness specification from the bus config */
599 if (bus && bus->reg_format_endian_default)
600 endian = bus->reg_format_endian_default;
601
602 /* If the bus specified a non-default value, use that */
603 if (endian != REGMAP_ENDIAN_DEFAULT)
604 return endian;
605
606 /* Use this if no other value was found */
607 return REGMAP_ENDIAN_BIG;
608}
609
610enum regmap_endian regmap_get_val_endian(struct device *dev,
611 const struct regmap_bus *bus,
612 const struct regmap_config *config)
613{
614 struct device_node *np;
615 enum regmap_endian endian;
616
617 /* Retrieve the endianness specification from the regmap config */
618 endian = config->val_format_endian;
619
620 /* If the regmap config specified a non-default value, use that */
621 if (endian != REGMAP_ENDIAN_DEFAULT)
622 return endian;
623
624 /* If the dev and dev->of_node exist try to get endianness from DT */
625 if (dev && dev->of_node) {
626 np = dev->of_node;
627
628 /* Parse the device's DT node for an endianness specification */
629 if (of_property_read_bool(np, "big-endian"))
630 endian = REGMAP_ENDIAN_BIG;
631 else if (of_property_read_bool(np, "little-endian"))
632 endian = REGMAP_ENDIAN_LITTLE;
633 else if (of_property_read_bool(np, "native-endian"))
634 endian = REGMAP_ENDIAN_NATIVE;
635
636 /* If the endianness was specified in DT, use that */
637 if (endian != REGMAP_ENDIAN_DEFAULT)
638 return endian;
639 }
640
641 /* Retrieve the endianness specification from the bus config */
642 if (bus && bus->val_format_endian_default)
643 endian = bus->val_format_endian_default;
644
645 /* If the bus specified a non-default value, use that */
646 if (endian != REGMAP_ENDIAN_DEFAULT)
647 return endian;
648
649 /* Use this if no other value was found */
650 return REGMAP_ENDIAN_BIG;
651}
652EXPORT_SYMBOL_GPL(regmap_get_val_endian);
653
654struct regmap *__regmap_init(struct device *dev,
655 const struct regmap_bus *bus,
656 void *bus_context,
657 const struct regmap_config *config,
658 struct lock_class_key *lock_key,
659 const char *lock_name)
660{
661 struct regmap *map;
662 int ret = -EINVAL;
663 enum regmap_endian reg_endian, val_endian;
664 int i, j;
665
666 if (!config)
667 goto err;
668
669 map = kzalloc(sizeof(*map), GFP_KERNEL);
670 if (map == NULL) {
671 ret = -ENOMEM;
672 goto err;
673 }
674
675 if (config->name) {
676 map->name = kstrdup_const(config->name, GFP_KERNEL);
677 if (!map->name) {
678 ret = -ENOMEM;
679 goto err_map;
680 }
681 }
682
683 if (config->disable_locking) {
684 map->lock = map->unlock = regmap_lock_unlock_none;
685 regmap_debugfs_disable(map);
686 } else if (config->lock && config->unlock) {
687 map->lock = config->lock;
688 map->unlock = config->unlock;
689 map->lock_arg = config->lock_arg;
690 } else if (config->use_hwlock) {
691 map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
692 if (!map->hwlock) {
693 ret = -ENXIO;
694 goto err_name;
695 }
696
697 switch (config->hwlock_mode) {
698 case HWLOCK_IRQSTATE:
699 map->lock = regmap_lock_hwlock_irqsave;
700 map->unlock = regmap_unlock_hwlock_irqrestore;
701 break;
702 case HWLOCK_IRQ:
703 map->lock = regmap_lock_hwlock_irq;
704 map->unlock = regmap_unlock_hwlock_irq;
705 break;
706 default:
707 map->lock = regmap_lock_hwlock;
708 map->unlock = regmap_unlock_hwlock;
709 break;
710 }
711
712 map->lock_arg = map;
713 } else {
714 if ((bus && bus->fast_io) ||
715 config->fast_io) {
716 spin_lock_init(&map->spinlock);
717 map->lock = regmap_lock_spinlock;
718 map->unlock = regmap_unlock_spinlock;
719 lockdep_set_class_and_name(&map->spinlock,
720 lock_key, lock_name);
721 } else {
722 mutex_init(&map->mutex);
723 map->lock = regmap_lock_mutex;
724 map->unlock = regmap_unlock_mutex;
725 lockdep_set_class_and_name(&map->mutex,
726 lock_key, lock_name);
727 }
728 map->lock_arg = map;
729 }
730
731 /*
732 * When we write in fast-paths with regmap_bulk_write() don't allocate
733 * scratch buffers with sleeping allocations.
734 */
735 if ((bus && bus->fast_io) || config->fast_io)
736 map->alloc_flags = GFP_ATOMIC;
737 else
738 map->alloc_flags = GFP_KERNEL;
739
740 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
741 map->format.pad_bytes = config->pad_bits / 8;
742 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
743 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
744 config->val_bits + config->pad_bits, 8);
745 map->reg_shift = config->pad_bits % 8;
746 if (config->reg_stride)
747 map->reg_stride = config->reg_stride;
748 else
749 map->reg_stride = 1;
750 if (is_power_of_2(map->reg_stride))
751 map->reg_stride_order = ilog2(map->reg_stride);
752 else
753 map->reg_stride_order = -1;
754 map->use_single_read = config->use_single_rw || !bus || !bus->read;
755 map->use_single_write = config->use_single_rw || !bus || !bus->write;
756 map->can_multi_write = config->can_multi_write && bus && bus->write;
757 if (bus) {
758 map->max_raw_read = bus->max_raw_read;
759 map->max_raw_write = bus->max_raw_write;
760 }
761 map->dev = dev;
762 map->bus = bus;
763 map->bus_context = bus_context;
764 map->max_register = config->max_register;
765 map->wr_table = config->wr_table;
766 map->rd_table = config->rd_table;
767 map->volatile_table = config->volatile_table;
768 map->precious_table = config->precious_table;
769 map->writeable_reg = config->writeable_reg;
770 map->readable_reg = config->readable_reg;
771 map->volatile_reg = config->volatile_reg;
772 map->precious_reg = config->precious_reg;
773 map->cache_type = config->cache_type;
774
775 spin_lock_init(&map->async_lock);
776 INIT_LIST_HEAD(&map->async_list);
777 INIT_LIST_HEAD(&map->async_free);
778 init_waitqueue_head(&map->async_waitq);
779
780 if (config->read_flag_mask ||
781 config->write_flag_mask ||
782 config->zero_flag_mask) {
783 map->read_flag_mask = config->read_flag_mask;
784 map->write_flag_mask = config->write_flag_mask;
785 } else if (bus) {
786 map->read_flag_mask = bus->read_flag_mask;
787 }
788
789 if (!bus) {
790 map->reg_read = config->reg_read;
791 map->reg_write = config->reg_write;
792
793 map->defer_caching = false;
794 goto skip_format_initialization;
795 } else if (!bus->read || !bus->write) {
796 map->reg_read = _regmap_bus_reg_read;
797 map->reg_write = _regmap_bus_reg_write;
798
799 map->defer_caching = false;
800 goto skip_format_initialization;
801 } else {
802 map->reg_read = _regmap_bus_read;
803 map->reg_update_bits = bus->reg_update_bits;
804 }
805
806 reg_endian = regmap_get_reg_endian(bus, config);
807 val_endian = regmap_get_val_endian(dev, bus, config);
808
809 switch (config->reg_bits + map->reg_shift) {
810 case 2:
811 switch (config->val_bits) {
812 case 6:
813 map->format.format_write = regmap_format_2_6_write;
814 break;
815 default:
816 goto err_hwlock;
817 }
818 break;
819
820 case 4:
821 switch (config->val_bits) {
822 case 12:
823 map->format.format_write = regmap_format_4_12_write;
824 break;
825 default:
826 goto err_hwlock;
827 }
828 break;
829
830 case 7:
831 switch (config->val_bits) {
832 case 9:
833 map->format.format_write = regmap_format_7_9_write;
834 break;
835 default:
836 goto err_hwlock;
837 }
838 break;
839
840 case 10:
841 switch (config->val_bits) {
842 case 14:
843 map->format.format_write = regmap_format_10_14_write;
844 break;
845 default:
846 goto err_hwlock;
847 }
848 break;
849
850 case 8:
851 map->format.format_reg = regmap_format_8;
852 break;
853
854 case 16:
855 switch (reg_endian) {
856 case REGMAP_ENDIAN_BIG:
857 map->format.format_reg = regmap_format_16_be;
858 break;
859 case REGMAP_ENDIAN_LITTLE:
860 map->format.format_reg = regmap_format_16_le;
861 break;
862 case REGMAP_ENDIAN_NATIVE:
863 map->format.format_reg = regmap_format_16_native;
864 break;
865 default:
866 goto err_hwlock;
867 }
868 break;
869
870 case 24:
871 if (reg_endian != REGMAP_ENDIAN_BIG)
872 goto err_hwlock;
873 map->format.format_reg = regmap_format_24;
874 break;
875
876 case 32:
877 switch (reg_endian) {
878 case REGMAP_ENDIAN_BIG:
879 map->format.format_reg = regmap_format_32_be;
880 break;
881 case REGMAP_ENDIAN_LITTLE:
882 map->format.format_reg = regmap_format_32_le;
883 break;
884 case REGMAP_ENDIAN_NATIVE:
885 map->format.format_reg = regmap_format_32_native;
886 break;
887 default:
888 goto err_hwlock;
889 }
890 break;
891
892#ifdef CONFIG_64BIT
893 case 64:
894 switch (reg_endian) {
895 case REGMAP_ENDIAN_BIG:
896 map->format.format_reg = regmap_format_64_be;
897 break;
898 case REGMAP_ENDIAN_LITTLE:
899 map->format.format_reg = regmap_format_64_le;
900 break;
901 case REGMAP_ENDIAN_NATIVE:
902 map->format.format_reg = regmap_format_64_native;
903 break;
904 default:
905 goto err_hwlock;
906 }
907 break;
908#endif
909
910 default:
911 goto err_hwlock;
912 }
913
914 if (val_endian == REGMAP_ENDIAN_NATIVE)
915 map->format.parse_inplace = regmap_parse_inplace_noop;
916
917 switch (config->val_bits) {
918 case 8:
919 map->format.format_val = regmap_format_8;
920 map->format.parse_val = regmap_parse_8;
921 map->format.parse_inplace = regmap_parse_inplace_noop;
922 break;
923 case 16:
924 switch (val_endian) {
925 case REGMAP_ENDIAN_BIG:
926 map->format.format_val = regmap_format_16_be;
927 map->format.parse_val = regmap_parse_16_be;
928 map->format.parse_inplace = regmap_parse_16_be_inplace;
929 break;
930 case REGMAP_ENDIAN_LITTLE:
931 map->format.format_val = regmap_format_16_le;
932 map->format.parse_val = regmap_parse_16_le;
933 map->format.parse_inplace = regmap_parse_16_le_inplace;
934 break;
935 case REGMAP_ENDIAN_NATIVE:
936 map->format.format_val = regmap_format_16_native;
937 map->format.parse_val = regmap_parse_16_native;
938 break;
939 default:
940 goto err_hwlock;
941 }
942 break;
943 case 24:
944 if (val_endian != REGMAP_ENDIAN_BIG)
945 goto err_hwlock;
946 map->format.format_val = regmap_format_24;
947 map->format.parse_val = regmap_parse_24;
948 break;
949 case 32:
950 switch (val_endian) {
951 case REGMAP_ENDIAN_BIG:
952 map->format.format_val = regmap_format_32_be;
953 map->format.parse_val = regmap_parse_32_be;
954 map->format.parse_inplace = regmap_parse_32_be_inplace;
955 break;
956 case REGMAP_ENDIAN_LITTLE:
957 map->format.format_val = regmap_format_32_le;
958 map->format.parse_val = regmap_parse_32_le;
959 map->format.parse_inplace = regmap_parse_32_le_inplace;
960 break;
961 case REGMAP_ENDIAN_NATIVE:
962 map->format.format_val = regmap_format_32_native;
963 map->format.parse_val = regmap_parse_32_native;
964 break;
965 default:
966 goto err_hwlock;
967 }
968 break;
969#ifdef CONFIG_64BIT
970 case 64:
971 switch (val_endian) {
972 case REGMAP_ENDIAN_BIG:
973 map->format.format_val = regmap_format_64_be;
974 map->format.parse_val = regmap_parse_64_be;
975 map->format.parse_inplace = regmap_parse_64_be_inplace;
976 break;
977 case REGMAP_ENDIAN_LITTLE:
978 map->format.format_val = regmap_format_64_le;
979 map->format.parse_val = regmap_parse_64_le;
980 map->format.parse_inplace = regmap_parse_64_le_inplace;
981 break;
982 case REGMAP_ENDIAN_NATIVE:
983 map->format.format_val = regmap_format_64_native;
984 map->format.parse_val = regmap_parse_64_native;
985 break;
986 default:
987 goto err_hwlock;
988 }
989 break;
990#endif
991 }
992
993 if (map->format.format_write) {
994 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
995 (val_endian != REGMAP_ENDIAN_BIG))
996 goto err_hwlock;
997 map->use_single_write = true;
998 }
999
1000 if (!map->format.format_write &&
1001 !(map->format.format_reg && map->format.format_val))
1002 goto err_hwlock;
1003
1004 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
1005 if (map->work_buf == NULL) {
1006 ret = -ENOMEM;
1007 goto err_hwlock;
1008 }
1009
1010 if (map->format.format_write) {
1011 map->defer_caching = false;
1012 map->reg_write = _regmap_bus_formatted_write;
1013 } else if (map->format.format_val) {
1014 map->defer_caching = true;
1015 map->reg_write = _regmap_bus_raw_write;
1016 }
1017
1018skip_format_initialization:
1019
1020 map->range_tree = RB_ROOT;
1021 for (i = 0; i < config->num_ranges; i++) {
1022 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
1023 struct regmap_range_node *new;
1024
1025 /* Sanity check */
1026 if (range_cfg->range_max < range_cfg->range_min) {
1027 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
1028 range_cfg->range_max, range_cfg->range_min);
1029 goto err_range;
1030 }
1031
1032 if (range_cfg->range_max > map->max_register) {
1033 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
1034 range_cfg->range_max, map->max_register);
1035 goto err_range;
1036 }
1037
1038 if (range_cfg->selector_reg > map->max_register) {
1039 dev_err(map->dev,
1040 "Invalid range %d: selector out of map\n", i);
1041 goto err_range;
1042 }
1043
1044 if (range_cfg->window_len == 0) {
1045 dev_err(map->dev, "Invalid range %d: window_len 0\n",
1046 i);
1047 goto err_range;
1048 }
1049
1050 /* Make sure, that this register range has no selector
1051 or data window within its boundary */
1052 for (j = 0; j < config->num_ranges; j++) {
1053 unsigned sel_reg = config->ranges[j].selector_reg;
1054 unsigned win_min = config->ranges[j].window_start;
1055 unsigned win_max = win_min +
1056 config->ranges[j].window_len - 1;
1057
1058 /* Allow data window inside its own virtual range */
1059 if (j == i)
1060 continue;
1061
1062 if (range_cfg->range_min <= sel_reg &&
1063 sel_reg <= range_cfg->range_max) {
1064 dev_err(map->dev,
1065 "Range %d: selector for %d in window\n",
1066 i, j);
1067 goto err_range;
1068 }
1069
1070 if (!(win_max < range_cfg->range_min ||
1071 win_min > range_cfg->range_max)) {
1072 dev_err(map->dev,
1073 "Range %d: window for %d in window\n",
1074 i, j);
1075 goto err_range;
1076 }
1077 }
1078
1079 new = kzalloc(sizeof(*new), GFP_KERNEL);
1080 if (new == NULL) {
1081 ret = -ENOMEM;
1082 goto err_range;
1083 }
1084
1085 new->map = map;
1086 new->name = range_cfg->name;
1087 new->range_min = range_cfg->range_min;
1088 new->range_max = range_cfg->range_max;
1089 new->selector_reg = range_cfg->selector_reg;
1090 new->selector_mask = range_cfg->selector_mask;
1091 new->selector_shift = range_cfg->selector_shift;
1092 new->window_start = range_cfg->window_start;
1093 new->window_len = range_cfg->window_len;
1094
1095 if (!_regmap_range_add(map, new)) {
1096 dev_err(map->dev, "Failed to add range %d\n", i);
1097 kfree(new);
1098 goto err_range;
1099 }
1100
1101 if (map->selector_work_buf == NULL) {
1102 map->selector_work_buf =
1103 kzalloc(map->format.buf_size, GFP_KERNEL);
1104 if (map->selector_work_buf == NULL) {
1105 ret = -ENOMEM;
1106 goto err_range;
1107 }
1108 }
1109 }
1110
1111 ret = regcache_init(map, config);
1112 if (ret != 0)
1113 goto err_range;
1114
1115 if (dev) {
1116 ret = regmap_attach_dev(dev, map, config);
1117 if (ret != 0)
1118 goto err_regcache;
1119 } else {
1120 regmap_debugfs_init(map, config->name);
1121 }
1122
1123 return map;
1124
1125err_regcache:
1126 regcache_exit(map);
1127err_range:
1128 regmap_range_exit(map);
1129 kfree(map->work_buf);
1130err_hwlock:
1131 if (map->hwlock)
1132 hwspin_lock_free(map->hwlock);
1133err_name:
1134 kfree_const(map->name);
1135err_map:
1136 kfree(map);
1137err:
1138 return ERR_PTR(ret);
1139}
1140EXPORT_SYMBOL_GPL(__regmap_init);
1141
1142static void devm_regmap_release(struct device *dev, void *res)
1143{
1144 regmap_exit(*(struct regmap **)res);
1145}
1146
1147struct regmap *__devm_regmap_init(struct device *dev,
1148 const struct regmap_bus *bus,
1149 void *bus_context,
1150 const struct regmap_config *config,
1151 struct lock_class_key *lock_key,
1152 const char *lock_name)
1153{
1154 struct regmap **ptr, *regmap;
1155
1156 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
1157 if (!ptr)
1158 return ERR_PTR(-ENOMEM);
1159
1160 regmap = __regmap_init(dev, bus, bus_context, config,
1161 lock_key, lock_name);
1162 if (!IS_ERR(regmap)) {
1163 *ptr = regmap;
1164 devres_add(dev, ptr);
1165 } else {
1166 devres_free(ptr);
1167 }
1168
1169 return regmap;
1170}
1171EXPORT_SYMBOL_GPL(__devm_regmap_init);
1172
1173static void regmap_field_init(struct regmap_field *rm_field,
1174 struct regmap *regmap, struct reg_field reg_field)
1175{
1176 rm_field->regmap = regmap;
1177 rm_field->reg = reg_field.reg;
1178 rm_field->shift = reg_field.lsb;
1179 rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
1180 rm_field->id_size = reg_field.id_size;
1181 rm_field->id_offset = reg_field.id_offset;
1182}
1183
1184/**
1185 * devm_regmap_field_alloc() - Allocate and initialise a register field.
1186 *
1187 * @dev: Device that will be interacted with
1188 * @regmap: regmap bank in which this register field is located.
1189 * @reg_field: Register field with in the bank.
1190 *
1191 * The return value will be an ERR_PTR() on error or a valid pointer
1192 * to a struct regmap_field. The regmap_field will be automatically freed
1193 * by the device management code.
1194 */
1195struct regmap_field *devm_regmap_field_alloc(struct device *dev,
1196 struct regmap *regmap, struct reg_field reg_field)
1197{
1198 struct regmap_field *rm_field = devm_kzalloc(dev,
1199 sizeof(*rm_field), GFP_KERNEL);
1200 if (!rm_field)
1201 return ERR_PTR(-ENOMEM);
1202
1203 regmap_field_init(rm_field, regmap, reg_field);
1204
1205 return rm_field;
1206
1207}
1208EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
1209
1210/**
1211 * devm_regmap_field_free() - Free a register field allocated using
1212 * devm_regmap_field_alloc.
1213 *
1214 * @dev: Device that will be interacted with
1215 * @field: regmap field which should be freed.
1216 *
1217 * Free register field allocated using devm_regmap_field_alloc(). Usually
1218 * drivers need not call this function, as the memory allocated via devm
1219 * will be freed as per device-driver life-cyle.
1220 */
1221void devm_regmap_field_free(struct device *dev,
1222 struct regmap_field *field)
1223{
1224 devm_kfree(dev, field);
1225}
1226EXPORT_SYMBOL_GPL(devm_regmap_field_free);
1227
1228/**
1229 * regmap_field_alloc() - Allocate and initialise a register field.
1230 *
1231 * @regmap: regmap bank in which this register field is located.
1232 * @reg_field: Register field with in the bank.
1233 *
1234 * The return value will be an ERR_PTR() on error or a valid pointer
1235 * to a struct regmap_field. The regmap_field should be freed by the
1236 * user once its finished working with it using regmap_field_free().
1237 */
1238struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1239 struct reg_field reg_field)
1240{
1241 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1242
1243 if (!rm_field)
1244 return ERR_PTR(-ENOMEM);
1245
1246 regmap_field_init(rm_field, regmap, reg_field);
1247
1248 return rm_field;
1249}
1250EXPORT_SYMBOL_GPL(regmap_field_alloc);
1251
1252/**
1253 * regmap_field_free() - Free register field allocated using
1254 * regmap_field_alloc.
1255 *
1256 * @field: regmap field which should be freed.
1257 */
1258void regmap_field_free(struct regmap_field *field)
1259{
1260 kfree(field);
1261}
1262EXPORT_SYMBOL_GPL(regmap_field_free);
1263
1264/**
1265 * regmap_reinit_cache() - Reinitialise the current register cache
1266 *
1267 * @map: Register map to operate on.
1268 * @config: New configuration. Only the cache data will be used.
1269 *
1270 * Discard any existing register cache for the map and initialize a
1271 * new cache. This can be used to restore the cache to defaults or to
1272 * update the cache configuration to reflect runtime discovery of the
1273 * hardware.
1274 *
1275 * No explicit locking is done here, the user needs to ensure that
1276 * this function will not race with other calls to regmap.
1277 */
1278int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1279{
1280 regcache_exit(map);
1281 regmap_debugfs_exit(map);
1282
1283 map->max_register = config->max_register;
1284 map->writeable_reg = config->writeable_reg;
1285 map->readable_reg = config->readable_reg;
1286 map->volatile_reg = config->volatile_reg;
1287 map->precious_reg = config->precious_reg;
1288 map->cache_type = config->cache_type;
1289
1290 regmap_debugfs_init(map, config->name);
1291
1292 map->cache_bypass = false;
1293 map->cache_only = false;
1294
1295 return regcache_init(map, config);
1296}
1297EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1298
1299/**
1300 * regmap_exit() - Free a previously allocated register map
1301 *
1302 * @map: Register map to operate on.
1303 */
1304void regmap_exit(struct regmap *map)
1305{
1306 struct regmap_async *async;
1307
1308 regcache_exit(map);
1309 regmap_debugfs_exit(map);
1310 regmap_range_exit(map);
1311 if (map->bus && map->bus->free_context)
1312 map->bus->free_context(map->bus_context);
1313 kfree(map->work_buf);
1314 while (!list_empty(&map->async_free)) {
1315 async = list_first_entry_or_null(&map->async_free,
1316 struct regmap_async,
1317 list);
1318 list_del(&async->list);
1319 kfree(async->work_buf);
1320 kfree(async);
1321 }
1322 if (map->hwlock)
1323 hwspin_lock_free(map->hwlock);
1324 kfree_const(map->name);
1325 kfree(map);
1326}
1327EXPORT_SYMBOL_GPL(regmap_exit);
1328
1329static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1330{
1331 struct regmap **r = res;
1332 if (!r || !*r) {
1333 WARN_ON(!r || !*r);
1334 return 0;
1335 }
1336
1337 /* If the user didn't specify a name match any */
1338 if (data)
1339 return (*r)->name == data;
1340 else
1341 return 1;
1342}
1343
1344/**
1345 * dev_get_regmap() - Obtain the regmap (if any) for a device
1346 *
1347 * @dev: Device to retrieve the map for
1348 * @name: Optional name for the register map, usually NULL.
1349 *
1350 * Returns the regmap for the device if one is present, or NULL. If
1351 * name is specified then it must match the name specified when
1352 * registering the device, if it is NULL then the first regmap found
1353 * will be used. Devices with multiple register maps are very rare,
1354 * generic code should normally not need to specify a name.
1355 */
1356struct regmap *dev_get_regmap(struct device *dev, const char *name)
1357{
1358 struct regmap **r = devres_find(dev, dev_get_regmap_release,
1359 dev_get_regmap_match, (void *)name);
1360
1361 if (!r)
1362 return NULL;
1363 return *r;
1364}
1365EXPORT_SYMBOL_GPL(dev_get_regmap);
1366
1367/**
1368 * regmap_get_device() - Obtain the device from a regmap
1369 *
1370 * @map: Register map to operate on.
1371 *
1372 * Returns the underlying device that the regmap has been created for.
1373 */
1374struct device *regmap_get_device(struct regmap *map)
1375{
1376 return map->dev;
1377}
1378EXPORT_SYMBOL_GPL(regmap_get_device);
1379
1380static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1381 struct regmap_range_node *range,
1382 unsigned int val_num)
1383{
1384 void *orig_work_buf;
1385 unsigned int win_offset;
1386 unsigned int win_page;
1387 bool page_chg;
1388 int ret;
1389
1390 win_offset = (*reg - range->range_min) % range->window_len;
1391 win_page = (*reg - range->range_min) / range->window_len;
1392
1393 if (val_num > 1) {
1394 /* Bulk write shouldn't cross range boundary */
1395 if (*reg + val_num - 1 > range->range_max)
1396 return -EINVAL;
1397
1398 /* ... or single page boundary */
1399 if (val_num > range->window_len - win_offset)
1400 return -EINVAL;
1401 }
1402
1403 /* It is possible to have selector register inside data window.
1404 In that case, selector register is located on every page and
1405 it needs no page switching, when accessed alone. */
1406 if (val_num > 1 ||
1407 range->window_start + win_offset != range->selector_reg) {
1408 /* Use separate work_buf during page switching */
1409 orig_work_buf = map->work_buf;
1410 map->work_buf = map->selector_work_buf;
1411
1412 ret = _regmap_update_bits(map, range->selector_reg,
1413 range->selector_mask,
1414 win_page << range->selector_shift,
1415 &page_chg, false);
1416
1417 map->work_buf = orig_work_buf;
1418
1419 if (ret != 0)
1420 return ret;
1421 }
1422
1423 *reg = range->window_start + win_offset;
1424
1425 return 0;
1426}
1427
1428static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes,
1429 unsigned long mask)
1430{
1431 u8 *buf;
1432 int i;
1433
1434 if (!mask || !map->work_buf)
1435 return;
1436
1437 buf = map->work_buf;
1438
1439 for (i = 0; i < max_bytes; i++)
1440 buf[i] |= (mask >> (8 * i)) & 0xff;
1441}
1442
1443static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
1444 const void *val, size_t val_len)
1445{
1446 struct regmap_range_node *range;
1447 unsigned long flags;
1448 void *work_val = map->work_buf + map->format.reg_bytes +
1449 map->format.pad_bytes;
1450 void *buf;
1451 int ret = -ENOTSUPP;
1452 size_t len;
1453 int i;
1454
1455 WARN_ON(!map->bus);
1456
1457 /* Check for unwritable registers before we start */
1458 if (map->writeable_reg)
1459 for (i = 0; i < val_len / map->format.val_bytes; i++)
1460 if (!map->writeable_reg(map->dev,
1461 reg + regmap_get_offset(map, i)))
1462 return -EINVAL;
1463
1464 if (!map->cache_bypass && map->format.parse_val) {
1465 unsigned int ival;
1466 int val_bytes = map->format.val_bytes;
1467 for (i = 0; i < val_len / val_bytes; i++) {
1468 ival = map->format.parse_val(val + (i * val_bytes));
1469 ret = regcache_write(map,
1470 reg + regmap_get_offset(map, i),
1471 ival);
1472 if (ret) {
1473 dev_err(map->dev,
1474 "Error in caching of register: %x ret: %d\n",
1475 reg + i, ret);
1476 return ret;
1477 }
1478 }
1479 if (map->cache_only) {
1480 map->cache_dirty = true;
1481 return 0;
1482 }
1483 }
1484
1485 range = _regmap_range_lookup(map, reg);
1486 if (range) {
1487 int val_num = val_len / map->format.val_bytes;
1488 int win_offset = (reg - range->range_min) % range->window_len;
1489 int win_residue = range->window_len - win_offset;
1490
1491 /* If the write goes beyond the end of the window split it */
1492 while (val_num > win_residue) {
1493 dev_dbg(map->dev, "Writing window %d/%zu\n",
1494 win_residue, val_len / map->format.val_bytes);
1495 ret = _regmap_raw_write_impl(map, reg, val,
1496 win_residue *
1497 map->format.val_bytes);
1498 if (ret != 0)
1499 return ret;
1500
1501 reg += win_residue;
1502 val_num -= win_residue;
1503 val += win_residue * map->format.val_bytes;
1504 val_len -= win_residue * map->format.val_bytes;
1505
1506 win_offset = (reg - range->range_min) %
1507 range->window_len;
1508 win_residue = range->window_len - win_offset;
1509 }
1510
1511 ret = _regmap_select_page(map, ®, range, val_num);
1512 if (ret != 0)
1513 return ret;
1514 }
1515
1516 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1517 regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
1518 map->write_flag_mask);
1519
1520 /*
1521 * Essentially all I/O mechanisms will be faster with a single
1522 * buffer to write. Since register syncs often generate raw
1523 * writes of single registers optimise that case.
1524 */
1525 if (val != work_val && val_len == map->format.val_bytes) {
1526 memcpy(work_val, val, map->format.val_bytes);
1527 val = work_val;
1528 }
1529
1530 if (map->async && map->bus->async_write) {
1531 struct regmap_async *async;
1532
1533 trace_regmap_async_write_start(map, reg, val_len);
1534
1535 spin_lock_irqsave(&map->async_lock, flags);
1536 async = list_first_entry_or_null(&map->async_free,
1537 struct regmap_async,
1538 list);
1539 if (async)
1540 list_del(&async->list);
1541 spin_unlock_irqrestore(&map->async_lock, flags);
1542
1543 if (!async) {
1544 async = map->bus->async_alloc();
1545 if (!async)
1546 return -ENOMEM;
1547
1548 async->work_buf = kzalloc(map->format.buf_size,
1549 GFP_KERNEL | GFP_DMA);
1550 if (!async->work_buf) {
1551 kfree(async);
1552 return -ENOMEM;
1553 }
1554 }
1555
1556 async->map = map;
1557
1558 /* If the caller supplied the value we can use it safely. */
1559 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1560 map->format.reg_bytes + map->format.val_bytes);
1561
1562 spin_lock_irqsave(&map->async_lock, flags);
1563 list_add_tail(&async->list, &map->async_list);
1564 spin_unlock_irqrestore(&map->async_lock, flags);
1565
1566 if (val != work_val)
1567 ret = map->bus->async_write(map->bus_context,
1568 async->work_buf,
1569 map->format.reg_bytes +
1570 map->format.pad_bytes,
1571 val, val_len, async);
1572 else
1573 ret = map->bus->async_write(map->bus_context,
1574 async->work_buf,
1575 map->format.reg_bytes +
1576 map->format.pad_bytes +
1577 val_len, NULL, 0, async);
1578
1579 if (ret != 0) {
1580 dev_err(map->dev, "Failed to schedule write: %d\n",
1581 ret);
1582
1583 spin_lock_irqsave(&map->async_lock, flags);
1584 list_move(&async->list, &map->async_free);
1585 spin_unlock_irqrestore(&map->async_lock, flags);
1586 }
1587
1588 return ret;
1589 }
1590
1591 trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1592
1593 /* If we're doing a single register write we can probably just
1594 * send the work_buf directly, otherwise try to do a gather
1595 * write.
1596 */
1597 if (val == work_val)
1598 ret = map->bus->write(map->bus_context, map->work_buf,
1599 map->format.reg_bytes +
1600 map->format.pad_bytes +
1601 val_len);
1602 else if (map->bus->gather_write)
1603 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1604 map->format.reg_bytes +
1605 map->format.pad_bytes,
1606 val, val_len);
1607
1608 /* If that didn't work fall back on linearising by hand. */
1609 if (ret == -ENOTSUPP) {
1610 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1611 buf = kzalloc(len, GFP_KERNEL);
1612 if (!buf)
1613 return -ENOMEM;
1614
1615 memcpy(buf, map->work_buf, map->format.reg_bytes);
1616 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1617 val, val_len);
1618 ret = map->bus->write(map->bus_context, buf, len);
1619
1620 kfree(buf);
1621 } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
1622 /* regcache_drop_region() takes lock that we already have,
1623 * thus call map->cache_ops->drop() directly
1624 */
1625 if (map->cache_ops && map->cache_ops->drop)
1626 map->cache_ops->drop(map, reg, reg + 1);
1627 }
1628
1629 trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1630
1631 return ret;
1632}
1633
1634/**
1635 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1636 *
1637 * @map: Map to check.
1638 */
1639bool regmap_can_raw_write(struct regmap *map)
1640{
1641 return map->bus && map->bus->write && map->format.format_val &&
1642 map->format.format_reg;
1643}
1644EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1645
1646/**
1647 * regmap_get_raw_read_max - Get the maximum size we can read
1648 *
1649 * @map: Map to check.
1650 */
1651size_t regmap_get_raw_read_max(struct regmap *map)
1652{
1653 return map->max_raw_read;
1654}
1655EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
1656
1657/**
1658 * regmap_get_raw_write_max - Get the maximum size we can read
1659 *
1660 * @map: Map to check.
1661 */
1662size_t regmap_get_raw_write_max(struct regmap *map)
1663{
1664 return map->max_raw_write;
1665}
1666EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
1667
1668static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1669 unsigned int val)
1670{
1671 int ret;
1672 struct regmap_range_node *range;
1673 struct regmap *map = context;
1674
1675 WARN_ON(!map->bus || !map->format.format_write);
1676
1677 range = _regmap_range_lookup(map, reg);
1678 if (range) {
1679 ret = _regmap_select_page(map, ®, range, 1);
1680 if (ret != 0)
1681 return ret;
1682 }
1683
1684 map->format.format_write(map, reg, val);
1685
1686 trace_regmap_hw_write_start(map, reg, 1);
1687
1688 ret = map->bus->write(map->bus_context, map->work_buf,
1689 map->format.buf_size);
1690
1691 trace_regmap_hw_write_done(map, reg, 1);
1692
1693 return ret;
1694}
1695
1696static int _regmap_bus_reg_write(void *context, unsigned int reg,
1697 unsigned int val)
1698{
1699 struct regmap *map = context;
1700
1701 return map->bus->reg_write(map->bus_context, reg, val);
1702}
1703
1704static int _regmap_bus_raw_write(void *context, unsigned int reg,
1705 unsigned int val)
1706{
1707 struct regmap *map = context;
1708
1709 WARN_ON(!map->bus || !map->format.format_val);
1710
1711 map->format.format_val(map->work_buf + map->format.reg_bytes
1712 + map->format.pad_bytes, val, 0);
1713 return _regmap_raw_write_impl(map, reg,
1714 map->work_buf +
1715 map->format.reg_bytes +
1716 map->format.pad_bytes,
1717 map->format.val_bytes);
1718}
1719
1720static inline void *_regmap_map_get_context(struct regmap *map)
1721{
1722 return (map->bus) ? map : map->bus_context;
1723}
1724
1725int _regmap_write(struct regmap *map, unsigned int reg,
1726 unsigned int val)
1727{
1728 int ret;
1729 void *context = _regmap_map_get_context(map);
1730
1731 if (!regmap_writeable(map, reg))
1732 return -EIO;
1733
1734 if (!map->cache_bypass && !map->defer_caching) {
1735 ret = regcache_write(map, reg, val);
1736 if (ret != 0)
1737 return ret;
1738 if (map->cache_only) {
1739 map->cache_dirty = true;
1740 return 0;
1741 }
1742 }
1743
1744#ifdef LOG_DEVICE
1745 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1746 dev_info(map->dev, "%x <= %x\n", reg, val);
1747#endif
1748
1749 trace_regmap_reg_write(map, reg, val);
1750
1751 return map->reg_write(context, reg, val);
1752}
1753
1754/**
1755 * regmap_write() - Write a value to a single register
1756 *
1757 * @map: Register map to write to
1758 * @reg: Register to write to
1759 * @val: Value to be written
1760 *
1761 * A value of zero will be returned on success, a negative errno will
1762 * be returned in error cases.
1763 */
1764int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1765{
1766 int ret;
1767
1768 if (!IS_ALIGNED(reg, map->reg_stride))
1769 return -EINVAL;
1770
1771 map->lock(map->lock_arg);
1772
1773 ret = _regmap_write(map, reg, val);
1774
1775 map->unlock(map->lock_arg);
1776
1777 return ret;
1778}
1779EXPORT_SYMBOL_GPL(regmap_write);
1780
1781/**
1782 * regmap_write_async() - Write a value to a single register asynchronously
1783 *
1784 * @map: Register map to write to
1785 * @reg: Register to write to
1786 * @val: Value to be written
1787 *
1788 * A value of zero will be returned on success, a negative errno will
1789 * be returned in error cases.
1790 */
1791int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1792{
1793 int ret;
1794
1795 if (!IS_ALIGNED(reg, map->reg_stride))
1796 return -EINVAL;
1797
1798 map->lock(map->lock_arg);
1799
1800 map->async = true;
1801
1802 ret = _regmap_write(map, reg, val);
1803
1804 map->async = false;
1805
1806 map->unlock(map->lock_arg);
1807
1808 return ret;
1809}
1810EXPORT_SYMBOL_GPL(regmap_write_async);
1811
1812int _regmap_raw_write(struct regmap *map, unsigned int reg,
1813 const void *val, size_t val_len)
1814{
1815 size_t val_bytes = map->format.val_bytes;
1816 size_t val_count = val_len / val_bytes;
1817 size_t chunk_count, chunk_bytes;
1818 size_t chunk_regs = val_count;
1819 int ret, i;
1820
1821 if (!val_count)
1822 return -EINVAL;
1823
1824 if (map->use_single_write)
1825 chunk_regs = 1;
1826 else if (map->max_raw_write && val_len > map->max_raw_write)
1827 chunk_regs = map->max_raw_write / val_bytes;
1828
1829 chunk_count = val_count / chunk_regs;
1830 chunk_bytes = chunk_regs * val_bytes;
1831
1832 /* Write as many bytes as possible with chunk_size */
1833 for (i = 0; i < chunk_count; i++) {
1834 ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes);
1835 if (ret)
1836 return ret;
1837
1838 reg += regmap_get_offset(map, chunk_regs);
1839 val += chunk_bytes;
1840 val_len -= chunk_bytes;
1841 }
1842
1843 /* Write remaining bytes */
1844 if (val_len)
1845 ret = _regmap_raw_write_impl(map, reg, val, val_len);
1846
1847 return ret;
1848}
1849
1850/**
1851 * regmap_raw_write() - Write raw values to one or more registers
1852 *
1853 * @map: Register map to write to
1854 * @reg: Initial register to write to
1855 * @val: Block of data to be written, laid out for direct transmission to the
1856 * device
1857 * @val_len: Length of data pointed to by val.
1858 *
1859 * This function is intended to be used for things like firmware
1860 * download where a large block of data needs to be transferred to the
1861 * device. No formatting will be done on the data provided.
1862 *
1863 * A value of zero will be returned on success, a negative errno will
1864 * be returned in error cases.
1865 */
1866int regmap_raw_write(struct regmap *map, unsigned int reg,
1867 const void *val, size_t val_len)
1868{
1869 int ret;
1870
1871 if (!regmap_can_raw_write(map))
1872 return -EINVAL;
1873 if (val_len % map->format.val_bytes)
1874 return -EINVAL;
1875
1876 map->lock(map->lock_arg);
1877
1878 ret = _regmap_raw_write(map, reg, val, val_len);
1879
1880 map->unlock(map->lock_arg);
1881
1882 return ret;
1883}
1884EXPORT_SYMBOL_GPL(regmap_raw_write);
1885
1886/**
1887 * regmap_field_update_bits_base() - Perform a read/modify/write cycle a
1888 * register field.
1889 *
1890 * @field: Register field to write to
1891 * @mask: Bitmask to change
1892 * @val: Value to be written
1893 * @change: Boolean indicating if a write was done
1894 * @async: Boolean indicating asynchronously
1895 * @force: Boolean indicating use force update
1896 *
1897 * Perform a read/modify/write cycle on the register field with change,
1898 * async, force option.
1899 *
1900 * A value of zero will be returned on success, a negative errno will
1901 * be returned in error cases.
1902 */
1903int regmap_field_update_bits_base(struct regmap_field *field,
1904 unsigned int mask, unsigned int val,
1905 bool *change, bool async, bool force)
1906{
1907 mask = (mask << field->shift) & field->mask;
1908
1909 return regmap_update_bits_base(field->regmap, field->reg,
1910 mask, val << field->shift,
1911 change, async, force);
1912}
1913EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
1914
1915/**
1916 * regmap_fields_update_bits_base() - Perform a read/modify/write cycle a
1917 * register field with port ID
1918 *
1919 * @field: Register field to write to
1920 * @id: port ID
1921 * @mask: Bitmask to change
1922 * @val: Value to be written
1923 * @change: Boolean indicating if a write was done
1924 * @async: Boolean indicating asynchronously
1925 * @force: Boolean indicating use force update
1926 *
1927 * A value of zero will be returned on success, a negative errno will
1928 * be returned in error cases.
1929 */
1930int regmap_fields_update_bits_base(struct regmap_field *field, unsigned int id,
1931 unsigned int mask, unsigned int val,
1932 bool *change, bool async, bool force)
1933{
1934 if (id >= field->id_size)
1935 return -EINVAL;
1936
1937 mask = (mask << field->shift) & field->mask;
1938
1939 return regmap_update_bits_base(field->regmap,
1940 field->reg + (field->id_offset * id),
1941 mask, val << field->shift,
1942 change, async, force);
1943}
1944EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
1945
1946/**
1947 * regmap_bulk_write() - Write multiple registers to the device
1948 *
1949 * @map: Register map to write to
1950 * @reg: First register to be write from
1951 * @val: Block of data to be written, in native register size for device
1952 * @val_count: Number of registers to write
1953 *
1954 * This function is intended to be used for writing a large block of
1955 * data to the device either in single transfer or multiple transfer.
1956 *
1957 * A value of zero will be returned on success, a negative errno will
1958 * be returned in error cases.
1959 */
1960int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1961 size_t val_count)
1962{
1963 int ret = 0, i;
1964 size_t val_bytes = map->format.val_bytes;
1965
1966 if (!IS_ALIGNED(reg, map->reg_stride))
1967 return -EINVAL;
1968
1969 /*
1970 * Some devices don't support bulk write, for them we have a series of
1971 * single write operations.
1972 */
1973 if (!map->bus || !map->format.parse_inplace) {
1974 map->lock(map->lock_arg);
1975 for (i = 0; i < val_count; i++) {
1976 unsigned int ival;
1977
1978 switch (val_bytes) {
1979 case 1:
1980 ival = *(u8 *)(val + (i * val_bytes));
1981 break;
1982 case 2:
1983 ival = *(u16 *)(val + (i * val_bytes));
1984 break;
1985 case 4:
1986 ival = *(u32 *)(val + (i * val_bytes));
1987 break;
1988#ifdef CONFIG_64BIT
1989 case 8:
1990 ival = *(u64 *)(val + (i * val_bytes));
1991 break;
1992#endif
1993 default:
1994 ret = -EINVAL;
1995 goto out;
1996 }
1997
1998 ret = _regmap_write(map,
1999 reg + regmap_get_offset(map, i),
2000 ival);
2001 if (ret != 0)
2002 goto out;
2003 }
2004out:
2005 map->unlock(map->lock_arg);
2006 } else {
2007 void *wval;
2008
2009 wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
2010 if (!wval)
2011 return -ENOMEM;
2012
2013 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2014 map->format.parse_inplace(wval + i);
2015
2016 ret = regmap_raw_write(map, reg, wval, val_bytes * val_count);
2017
2018 kfree(wval);
2019 }
2020 return ret;
2021}
2022EXPORT_SYMBOL_GPL(regmap_bulk_write);
2023
2024/*
2025 * _regmap_raw_multi_reg_write()
2026 *
2027 * the (register,newvalue) pairs in regs have not been formatted, but
2028 * they are all in the same page and have been changed to being page
2029 * relative. The page register has been written if that was necessary.
2030 */
2031static int _regmap_raw_multi_reg_write(struct regmap *map,
2032 const struct reg_sequence *regs,
2033 size_t num_regs)
2034{
2035 int ret;
2036 void *buf;
2037 int i;
2038 u8 *u8;
2039 size_t val_bytes = map->format.val_bytes;
2040 size_t reg_bytes = map->format.reg_bytes;
2041 size_t pad_bytes = map->format.pad_bytes;
2042 size_t pair_size = reg_bytes + pad_bytes + val_bytes;
2043 size_t len = pair_size * num_regs;
2044
2045 if (!len)
2046 return -EINVAL;
2047
2048 buf = kzalloc(len, GFP_KERNEL);
2049 if (!buf)
2050 return -ENOMEM;
2051
2052 /* We have to linearise by hand. */
2053
2054 u8 = buf;
2055
2056 for (i = 0; i < num_regs; i++) {
2057 unsigned int reg = regs[i].reg;
2058 unsigned int val = regs[i].def;
2059 trace_regmap_hw_write_start(map, reg, 1);
2060 map->format.format_reg(u8, reg, map->reg_shift);
2061 u8 += reg_bytes + pad_bytes;
2062 map->format.format_val(u8, val, 0);
2063 u8 += val_bytes;
2064 }
2065 u8 = buf;
2066 *u8 |= map->write_flag_mask;
2067
2068 ret = map->bus->write(map->bus_context, buf, len);
2069
2070 kfree(buf);
2071
2072 for (i = 0; i < num_regs; i++) {
2073 int reg = regs[i].reg;
2074 trace_regmap_hw_write_done(map, reg, 1);
2075 }
2076 return ret;
2077}
2078
2079static unsigned int _regmap_register_page(struct regmap *map,
2080 unsigned int reg,
2081 struct regmap_range_node *range)
2082{
2083 unsigned int win_page = (reg - range->range_min) / range->window_len;
2084
2085 return win_page;
2086}
2087
2088static int _regmap_range_multi_paged_reg_write(struct regmap *map,
2089 struct reg_sequence *regs,
2090 size_t num_regs)
2091{
2092 int ret;
2093 int i, n;
2094 struct reg_sequence *base;
2095 unsigned int this_page = 0;
2096 unsigned int page_change = 0;
2097 /*
2098 * the set of registers are not neccessarily in order, but
2099 * since the order of write must be preserved this algorithm
2100 * chops the set each time the page changes. This also applies
2101 * if there is a delay required at any point in the sequence.
2102 */
2103 base = regs;
2104 for (i = 0, n = 0; i < num_regs; i++, n++) {
2105 unsigned int reg = regs[i].reg;
2106 struct regmap_range_node *range;
2107
2108 range = _regmap_range_lookup(map, reg);
2109 if (range) {
2110 unsigned int win_page = _regmap_register_page(map, reg,
2111 range);
2112
2113 if (i == 0)
2114 this_page = win_page;
2115 if (win_page != this_page) {
2116 this_page = win_page;
2117 page_change = 1;
2118 }
2119 }
2120
2121 /* If we have both a page change and a delay make sure to
2122 * write the regs and apply the delay before we change the
2123 * page.
2124 */
2125
2126 if (page_change || regs[i].delay_us) {
2127
2128 /* For situations where the first write requires
2129 * a delay we need to make sure we don't call
2130 * raw_multi_reg_write with n=0
2131 * This can't occur with page breaks as we
2132 * never write on the first iteration
2133 */
2134 if (regs[i].delay_us && i == 0)
2135 n = 1;
2136
2137 ret = _regmap_raw_multi_reg_write(map, base, n);
2138 if (ret != 0)
2139 return ret;
2140
2141 if (regs[i].delay_us)
2142 udelay(regs[i].delay_us);
2143
2144 base += n;
2145 n = 0;
2146
2147 if (page_change) {
2148 ret = _regmap_select_page(map,
2149 &base[n].reg,
2150 range, 1);
2151 if (ret != 0)
2152 return ret;
2153
2154 page_change = 0;
2155 }
2156
2157 }
2158
2159 }
2160 if (n > 0)
2161 return _regmap_raw_multi_reg_write(map, base, n);
2162 return 0;
2163}
2164
2165static int _regmap_multi_reg_write(struct regmap *map,
2166 const struct reg_sequence *regs,
2167 size_t num_regs)
2168{
2169 int i;
2170 int ret;
2171
2172 if (!map->can_multi_write) {
2173 for (i = 0; i < num_regs; i++) {
2174 ret = _regmap_write(map, regs[i].reg, regs[i].def);
2175 if (ret != 0)
2176 return ret;
2177
2178 if (regs[i].delay_us)
2179 udelay(regs[i].delay_us);
2180 }
2181 return 0;
2182 }
2183
2184 if (!map->format.parse_inplace)
2185 return -EINVAL;
2186
2187 if (map->writeable_reg)
2188 for (i = 0; i < num_regs; i++) {
2189 int reg = regs[i].reg;
2190 if (!map->writeable_reg(map->dev, reg))
2191 return -EINVAL;
2192 if (!IS_ALIGNED(reg, map->reg_stride))
2193 return -EINVAL;
2194 }
2195
2196 if (!map->cache_bypass) {
2197 for (i = 0; i < num_regs; i++) {
2198 unsigned int val = regs[i].def;
2199 unsigned int reg = regs[i].reg;
2200 ret = regcache_write(map, reg, val);
2201 if (ret) {
2202 dev_err(map->dev,
2203 "Error in caching of register: %x ret: %d\n",
2204 reg, ret);
2205 return ret;
2206 }
2207 }
2208 if (map->cache_only) {
2209 map->cache_dirty = true;
2210 return 0;
2211 }
2212 }
2213
2214 WARN_ON(!map->bus);
2215
2216 for (i = 0; i < num_regs; i++) {
2217 unsigned int reg = regs[i].reg;
2218 struct regmap_range_node *range;
2219
2220 /* Coalesce all the writes between a page break or a delay
2221 * in a sequence
2222 */
2223 range = _regmap_range_lookup(map, reg);
2224 if (range || regs[i].delay_us) {
2225 size_t len = sizeof(struct reg_sequence)*num_regs;
2226 struct reg_sequence *base = kmemdup(regs, len,
2227 GFP_KERNEL);
2228 if (!base)
2229 return -ENOMEM;
2230 ret = _regmap_range_multi_paged_reg_write(map, base,
2231 num_regs);
2232 kfree(base);
2233
2234 return ret;
2235 }
2236 }
2237 return _regmap_raw_multi_reg_write(map, regs, num_regs);
2238}
2239
2240/**
2241 * regmap_multi_reg_write() - Write multiple registers to the device
2242 *
2243 * @map: Register map to write to
2244 * @regs: Array of structures containing register,value to be written
2245 * @num_regs: Number of registers to write
2246 *
2247 * Write multiple registers to the device where the set of register, value
2248 * pairs are supplied in any order, possibly not all in a single range.
2249 *
2250 * The 'normal' block write mode will send ultimately send data on the
2251 * target bus as R,V1,V2,V3,..,Vn where successively higher registers are
2252 * addressed. However, this alternative block multi write mode will send
2253 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2254 * must of course support the mode.
2255 *
2256 * A value of zero will be returned on success, a negative errno will be
2257 * returned in error cases.
2258 */
2259int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
2260 int num_regs)
2261{
2262 int ret;
2263
2264 map->lock(map->lock_arg);
2265
2266 ret = _regmap_multi_reg_write(map, regs, num_regs);
2267
2268 map->unlock(map->lock_arg);
2269
2270 return ret;
2271}
2272EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
2273
2274/**
2275 * regmap_multi_reg_write_bypassed() - Write multiple registers to the
2276 * device but not the cache
2277 *
2278 * @map: Register map to write to
2279 * @regs: Array of structures containing register,value to be written
2280 * @num_regs: Number of registers to write
2281 *
2282 * Write multiple registers to the device but not the cache where the set
2283 * of register are supplied in any order.
2284 *
2285 * This function is intended to be used for writing a large block of data
2286 * atomically to the device in single transfer for those I2C client devices
2287 * that implement this alternative block write mode.
2288 *
2289 * A value of zero will be returned on success, a negative errno will
2290 * be returned in error cases.
2291 */
2292int regmap_multi_reg_write_bypassed(struct regmap *map,
2293 const struct reg_sequence *regs,
2294 int num_regs)
2295{
2296 int ret;
2297 bool bypass;
2298
2299 map->lock(map->lock_arg);
2300
2301 bypass = map->cache_bypass;
2302 map->cache_bypass = true;
2303
2304 ret = _regmap_multi_reg_write(map, regs, num_regs);
2305
2306 map->cache_bypass = bypass;
2307
2308 map->unlock(map->lock_arg);
2309
2310 return ret;
2311}
2312EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
2313
2314/**
2315 * regmap_raw_write_async() - Write raw values to one or more registers
2316 * asynchronously
2317 *
2318 * @map: Register map to write to
2319 * @reg: Initial register to write to
2320 * @val: Block of data to be written, laid out for direct transmission to the
2321 * device. Must be valid until regmap_async_complete() is called.
2322 * @val_len: Length of data pointed to by val.
2323 *
2324 * This function is intended to be used for things like firmware
2325 * download where a large block of data needs to be transferred to the
2326 * device. No formatting will be done on the data provided.
2327 *
2328 * If supported by the underlying bus the write will be scheduled
2329 * asynchronously, helping maximise I/O speed on higher speed buses
2330 * like SPI. regmap_async_complete() can be called to ensure that all
2331 * asynchrnous writes have been completed.
2332 *
2333 * A value of zero will be returned on success, a negative errno will
2334 * be returned in error cases.
2335 */
2336int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2337 const void *val, size_t val_len)
2338{
2339 int ret;
2340
2341 if (val_len % map->format.val_bytes)
2342 return -EINVAL;
2343 if (!IS_ALIGNED(reg, map->reg_stride))
2344 return -EINVAL;
2345
2346 map->lock(map->lock_arg);
2347
2348 map->async = true;
2349
2350 ret = _regmap_raw_write(map, reg, val, val_len);
2351
2352 map->async = false;
2353
2354 map->unlock(map->lock_arg);
2355
2356 return ret;
2357}
2358EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2359
2360static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2361 unsigned int val_len)
2362{
2363 struct regmap_range_node *range;
2364 int ret;
2365
2366 WARN_ON(!map->bus);
2367
2368 if (!map->bus || !map->bus->read)
2369 return -EINVAL;
2370
2371 range = _regmap_range_lookup(map, reg);
2372 if (range) {
2373 ret = _regmap_select_page(map, ®, range,
2374 val_len / map->format.val_bytes);
2375 if (ret != 0)
2376 return ret;
2377 }
2378
2379 map->format.format_reg(map->work_buf, reg, map->reg_shift);
2380 regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
2381 map->read_flag_mask);
2382 trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2383
2384 ret = map->bus->read(map->bus_context, map->work_buf,
2385 map->format.reg_bytes + map->format.pad_bytes,
2386 val, val_len);
2387
2388 trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2389
2390 return ret;
2391}
2392
2393static int _regmap_bus_reg_read(void *context, unsigned int reg,
2394 unsigned int *val)
2395{
2396 struct regmap *map = context;
2397
2398 return map->bus->reg_read(map->bus_context, reg, val);
2399}
2400
2401static int _regmap_bus_read(void *context, unsigned int reg,
2402 unsigned int *val)
2403{
2404 int ret;
2405 struct regmap *map = context;
2406 void *work_val = map->work_buf + map->format.reg_bytes +
2407 map->format.pad_bytes;
2408
2409 if (!map->format.parse_val)
2410 return -EINVAL;
2411
2412 ret = _regmap_raw_read(map, reg, work_val, map->format.val_bytes);
2413 if (ret == 0)
2414 *val = map->format.parse_val(work_val);
2415
2416 return ret;
2417}
2418
2419static int _regmap_read(struct regmap *map, unsigned int reg,
2420 unsigned int *val)
2421{
2422 int ret;
2423 void *context = _regmap_map_get_context(map);
2424
2425 if (!map->cache_bypass) {
2426 ret = regcache_read(map, reg, val);
2427 if (ret == 0)
2428 return 0;
2429 }
2430
2431 if (map->cache_only)
2432 return -EBUSY;
2433
2434 if (!regmap_readable(map, reg))
2435 return -EIO;
2436
2437 ret = map->reg_read(context, reg, val);
2438 if (ret == 0) {
2439#ifdef LOG_DEVICE
2440 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2441 dev_info(map->dev, "%x => %x\n", reg, *val);
2442#endif
2443
2444 trace_regmap_reg_read(map, reg, *val);
2445
2446 if (!map->cache_bypass)
2447 regcache_write(map, reg, *val);
2448 }
2449
2450 return ret;
2451}
2452
2453/**
2454 * regmap_read() - Read a value from a single register
2455 *
2456 * @map: Register map to read from
2457 * @reg: Register to be read from
2458 * @val: Pointer to store read value
2459 *
2460 * A value of zero will be returned on success, a negative errno will
2461 * be returned in error cases.
2462 */
2463int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2464{
2465 int ret;
2466
2467 if (!IS_ALIGNED(reg, map->reg_stride))
2468 return -EINVAL;
2469
2470 map->lock(map->lock_arg);
2471
2472 ret = _regmap_read(map, reg, val);
2473
2474 map->unlock(map->lock_arg);
2475
2476 return ret;
2477}
2478EXPORT_SYMBOL_GPL(regmap_read);
2479
2480/**
2481 * regmap_raw_read() - Read raw data from the device
2482 *
2483 * @map: Register map to read from
2484 * @reg: First register to be read from
2485 * @val: Pointer to store read value
2486 * @val_len: Size of data to read
2487 *
2488 * A value of zero will be returned on success, a negative errno will
2489 * be returned in error cases.
2490 */
2491int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2492 size_t val_len)
2493{
2494 size_t val_bytes = map->format.val_bytes;
2495 size_t val_count = val_len / val_bytes;
2496 unsigned int v;
2497 int ret, i;
2498
2499 if (!map->bus)
2500 return -EINVAL;
2501 if (val_len % map->format.val_bytes)
2502 return -EINVAL;
2503 if (!IS_ALIGNED(reg, map->reg_stride))
2504 return -EINVAL;
2505 if (val_count == 0)
2506 return -EINVAL;
2507
2508 map->lock(map->lock_arg);
2509
2510 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2511 map->cache_type == REGCACHE_NONE) {
2512 size_t chunk_count, chunk_bytes;
2513 size_t chunk_regs = val_count;
2514
2515 if (!map->bus->read) {
2516 ret = -ENOTSUPP;
2517 goto out;
2518 }
2519
2520 if (map->use_single_read)
2521 chunk_regs = 1;
2522 else if (map->max_raw_read && val_len > map->max_raw_read)
2523 chunk_regs = map->max_raw_read / val_bytes;
2524
2525 chunk_count = val_count / chunk_regs;
2526 chunk_bytes = chunk_regs * val_bytes;
2527
2528 /* Read bytes that fit into whole chunks */
2529 for (i = 0; i < chunk_count; i++) {
2530 ret = _regmap_raw_read(map, reg, val, chunk_bytes);
2531 if (ret != 0)
2532 goto out;
2533
2534 reg += regmap_get_offset(map, chunk_regs);
2535 val += chunk_bytes;
2536 val_len -= chunk_bytes;
2537 }
2538
2539 /* Read remaining bytes */
2540 if (val_len) {
2541 ret = _regmap_raw_read(map, reg, val, val_len);
2542 if (ret != 0)
2543 goto out;
2544 }
2545 } else {
2546 /* Otherwise go word by word for the cache; should be low
2547 * cost as we expect to hit the cache.
2548 */
2549 for (i = 0; i < val_count; i++) {
2550 ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2551 &v);
2552 if (ret != 0)
2553 goto out;
2554
2555 map->format.format_val(val + (i * val_bytes), v, 0);
2556 }
2557 }
2558
2559 out:
2560 map->unlock(map->lock_arg);
2561
2562 return ret;
2563}
2564EXPORT_SYMBOL_GPL(regmap_raw_read);
2565
2566/**
2567 * regmap_field_read() - Read a value to a single register field
2568 *
2569 * @field: Register field to read from
2570 * @val: Pointer to store read value
2571 *
2572 * A value of zero will be returned on success, a negative errno will
2573 * be returned in error cases.
2574 */
2575int regmap_field_read(struct regmap_field *field, unsigned int *val)
2576{
2577 int ret;
2578 unsigned int reg_val;
2579 ret = regmap_read(field->regmap, field->reg, ®_val);
2580 if (ret != 0)
2581 return ret;
2582
2583 reg_val &= field->mask;
2584 reg_val >>= field->shift;
2585 *val = reg_val;
2586
2587 return ret;
2588}
2589EXPORT_SYMBOL_GPL(regmap_field_read);
2590
2591/**
2592 * regmap_fields_read() - Read a value to a single register field with port ID
2593 *
2594 * @field: Register field to read from
2595 * @id: port ID
2596 * @val: Pointer to store read value
2597 *
2598 * A value of zero will be returned on success, a negative errno will
2599 * be returned in error cases.
2600 */
2601int regmap_fields_read(struct regmap_field *field, unsigned int id,
2602 unsigned int *val)
2603{
2604 int ret;
2605 unsigned int reg_val;
2606
2607 if (id >= field->id_size)
2608 return -EINVAL;
2609
2610 ret = regmap_read(field->regmap,
2611 field->reg + (field->id_offset * id),
2612 ®_val);
2613 if (ret != 0)
2614 return ret;
2615
2616 reg_val &= field->mask;
2617 reg_val >>= field->shift;
2618 *val = reg_val;
2619
2620 return ret;
2621}
2622EXPORT_SYMBOL_GPL(regmap_fields_read);
2623
2624/**
2625 * regmap_bulk_read() - Read multiple registers from the device
2626 *
2627 * @map: Register map to read from
2628 * @reg: First register to be read from
2629 * @val: Pointer to store read value, in native register size for device
2630 * @val_count: Number of registers to read
2631 *
2632 * A value of zero will be returned on success, a negative errno will
2633 * be returned in error cases.
2634 */
2635int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2636 size_t val_count)
2637{
2638 int ret, i;
2639 size_t val_bytes = map->format.val_bytes;
2640 bool vol = regmap_volatile_range(map, reg, val_count);
2641
2642 if (!IS_ALIGNED(reg, map->reg_stride))
2643 return -EINVAL;
2644 if (val_count == 0)
2645 return -EINVAL;
2646
2647 if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2648 ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
2649 if (ret != 0)
2650 return ret;
2651
2652 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2653 map->format.parse_inplace(val + i);
2654 } else {
2655#ifdef CONFIG_64BIT
2656 u64 *u64 = val;
2657#endif
2658 u32 *u32 = val;
2659 u16 *u16 = val;
2660 u8 *u8 = val;
2661
2662 map->lock(map->lock_arg);
2663
2664 for (i = 0; i < val_count; i++) {
2665 unsigned int ival;
2666
2667 ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2668 &ival);
2669 if (ret != 0)
2670 goto out;
2671
2672 switch (map->format.val_bytes) {
2673#ifdef CONFIG_64BIT
2674 case 8:
2675 u64[i] = ival;
2676 break;
2677#endif
2678 case 4:
2679 u32[i] = ival;
2680 break;
2681 case 2:
2682 u16[i] = ival;
2683 break;
2684 case 1:
2685 u8[i] = ival;
2686 break;
2687 default:
2688 ret = -EINVAL;
2689 goto out;
2690 }
2691 }
2692
2693out:
2694 map->unlock(map->lock_arg);
2695 }
2696
2697 return ret;
2698}
2699EXPORT_SYMBOL_GPL(regmap_bulk_read);
2700
2701static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2702 unsigned int mask, unsigned int val,
2703 bool *change, bool force_write)
2704{
2705 int ret;
2706 unsigned int tmp, orig;
2707
2708 if (change)
2709 *change = false;
2710
2711 if (regmap_volatile(map, reg) && map->reg_update_bits) {
2712 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
2713 if (ret == 0 && change)
2714 *change = true;
2715 } else {
2716 ret = _regmap_read(map, reg, &orig);
2717 if (ret != 0)
2718 return ret;
2719
2720 tmp = orig & ~mask;
2721 tmp |= val & mask;
2722
2723 if (force_write || (tmp != orig)) {
2724 ret = _regmap_write(map, reg, tmp);
2725 if (ret == 0 && change)
2726 *change = true;
2727 }
2728 }
2729
2730 return ret;
2731}
2732
2733/**
2734 * regmap_update_bits_base() - Perform a read/modify/write cycle on a register
2735 *
2736 * @map: Register map to update
2737 * @reg: Register to update
2738 * @mask: Bitmask to change
2739 * @val: New value for bitmask
2740 * @change: Boolean indicating if a write was done
2741 * @async: Boolean indicating asynchronously
2742 * @force: Boolean indicating use force update
2743 *
2744 * Perform a read/modify/write cycle on a register map with change, async, force
2745 * options.
2746 *
2747 * If async is true:
2748 *
2749 * With most buses the read must be done synchronously so this is most useful
2750 * for devices with a cache which do not need to interact with the hardware to
2751 * determine the current register value.
2752 *
2753 * Returns zero for success, a negative number on error.
2754 */
2755int regmap_update_bits_base(struct regmap *map, unsigned int reg,
2756 unsigned int mask, unsigned int val,
2757 bool *change, bool async, bool force)
2758{
2759 int ret;
2760
2761 map->lock(map->lock_arg);
2762
2763 map->async = async;
2764
2765 ret = _regmap_update_bits(map, reg, mask, val, change, force);
2766
2767 map->async = false;
2768
2769 map->unlock(map->lock_arg);
2770
2771 return ret;
2772}
2773EXPORT_SYMBOL_GPL(regmap_update_bits_base);
2774
2775void regmap_async_complete_cb(struct regmap_async *async, int ret)
2776{
2777 struct regmap *map = async->map;
2778 bool wake;
2779
2780 trace_regmap_async_io_complete(map);
2781
2782 spin_lock(&map->async_lock);
2783 list_move(&async->list, &map->async_free);
2784 wake = list_empty(&map->async_list);
2785
2786 if (ret != 0)
2787 map->async_ret = ret;
2788
2789 spin_unlock(&map->async_lock);
2790
2791 if (wake)
2792 wake_up(&map->async_waitq);
2793}
2794EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2795
2796static int regmap_async_is_done(struct regmap *map)
2797{
2798 unsigned long flags;
2799 int ret;
2800
2801 spin_lock_irqsave(&map->async_lock, flags);
2802 ret = list_empty(&map->async_list);
2803 spin_unlock_irqrestore(&map->async_lock, flags);
2804
2805 return ret;
2806}
2807
2808/**
2809 * regmap_async_complete - Ensure all asynchronous I/O has completed.
2810 *
2811 * @map: Map to operate on.
2812 *
2813 * Blocks until any pending asynchronous I/O has completed. Returns
2814 * an error code for any failed I/O operations.
2815 */
2816int regmap_async_complete(struct regmap *map)
2817{
2818 unsigned long flags;
2819 int ret;
2820
2821 /* Nothing to do with no async support */
2822 if (!map->bus || !map->bus->async_write)
2823 return 0;
2824
2825 trace_regmap_async_complete_start(map);
2826
2827 wait_event(map->async_waitq, regmap_async_is_done(map));
2828
2829 spin_lock_irqsave(&map->async_lock, flags);
2830 ret = map->async_ret;
2831 map->async_ret = 0;
2832 spin_unlock_irqrestore(&map->async_lock, flags);
2833
2834 trace_regmap_async_complete_done(map);
2835
2836 return ret;
2837}
2838EXPORT_SYMBOL_GPL(regmap_async_complete);
2839
2840/**
2841 * regmap_register_patch - Register and apply register updates to be applied
2842 * on device initialistion
2843 *
2844 * @map: Register map to apply updates to.
2845 * @regs: Values to update.
2846 * @num_regs: Number of entries in regs.
2847 *
2848 * Register a set of register updates to be applied to the device
2849 * whenever the device registers are synchronised with the cache and
2850 * apply them immediately. Typically this is used to apply
2851 * corrections to be applied to the device defaults on startup, such
2852 * as the updates some vendors provide to undocumented registers.
2853 *
2854 * The caller must ensure that this function cannot be called
2855 * concurrently with either itself or regcache_sync().
2856 */
2857int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
2858 int num_regs)
2859{
2860 struct reg_sequence *p;
2861 int ret;
2862 bool bypass;
2863
2864 if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2865 num_regs))
2866 return 0;
2867
2868 p = krealloc(map->patch,
2869 sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
2870 GFP_KERNEL);
2871 if (p) {
2872 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2873 map->patch = p;
2874 map->patch_regs += num_regs;
2875 } else {
2876 return -ENOMEM;
2877 }
2878
2879 map->lock(map->lock_arg);
2880
2881 bypass = map->cache_bypass;
2882
2883 map->cache_bypass = true;
2884 map->async = true;
2885
2886 ret = _regmap_multi_reg_write(map, regs, num_regs);
2887
2888 map->async = false;
2889 map->cache_bypass = bypass;
2890
2891 map->unlock(map->lock_arg);
2892
2893 regmap_async_complete(map);
2894
2895 return ret;
2896}
2897EXPORT_SYMBOL_GPL(regmap_register_patch);
2898
2899/**
2900 * regmap_get_val_bytes() - Report the size of a register value
2901 *
2902 * @map: Register map to operate on.
2903 *
2904 * Report the size of a register value, mainly intended to for use by
2905 * generic infrastructure built on top of regmap.
2906 */
2907int regmap_get_val_bytes(struct regmap *map)
2908{
2909 if (map->format.format_write)
2910 return -EINVAL;
2911
2912 return map->format.val_bytes;
2913}
2914EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2915
2916/**
2917 * regmap_get_max_register() - Report the max register value
2918 *
2919 * @map: Register map to operate on.
2920 *
2921 * Report the max register value, mainly intended to for use by
2922 * generic infrastructure built on top of regmap.
2923 */
2924int regmap_get_max_register(struct regmap *map)
2925{
2926 return map->max_register ? map->max_register : -EINVAL;
2927}
2928EXPORT_SYMBOL_GPL(regmap_get_max_register);
2929
2930/**
2931 * regmap_get_reg_stride() - Report the register address stride
2932 *
2933 * @map: Register map to operate on.
2934 *
2935 * Report the register address stride, mainly intended to for use by
2936 * generic infrastructure built on top of regmap.
2937 */
2938int regmap_get_reg_stride(struct regmap *map)
2939{
2940 return map->reg_stride;
2941}
2942EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
2943
2944int regmap_parse_val(struct regmap *map, const void *buf,
2945 unsigned int *val)
2946{
2947 if (!map->format.parse_val)
2948 return -EINVAL;
2949
2950 *val = map->format.parse_val(buf);
2951
2952 return 0;
2953}
2954EXPORT_SYMBOL_GPL(regmap_parse_val);
2955
2956static int __init regmap_initcall(void)
2957{
2958 regmap_debugfs_initcall();
2959
2960 return 0;
2961}
2962postcore_initcall(regmap_initcall);