1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
7 #define LOG_CATEGORY LOGC_DM
13 #include <asm/global_data.h>
14 #include <linux/libfdt.h>
19 #include <dm/of_addr.h>
20 #include <dm/devres.h>
21 #include <linux/ioport.h>
22 #include <linux/compat.h>
23 #include <linux/err.h>
24 #include <linux/bitops.h>
27 * Internal representation of a regmap field. Instead of storing the MSB and
28 * LSB, store the shift and mask. This makes the code a bit cleaner and faster
29 * because the shift and mask don't have to be calculated every time.
32 struct regmap *regmap;
39 DECLARE_GLOBAL_DATA_PTR;
42 * do_range_check() - Control whether range checks are done
44 * Returns: true to do range checks, false to skip
46 * This is used to reduce code size on SPL where range checks are known not to
49 * Add this to the top of the file to enable them: #define LOG_DEBUG
51 static inline bool do_range_check(void)
53 return _LOG_DEBUG || !IS_ENABLED(CONFIG_SPL);
58 * regmap_alloc() - Allocate a regmap with a given number of ranges.
60 * @count: Number of ranges to be allocated for the regmap.
62 * The default regmap width is set to REGMAP_SIZE_32. Callers can override it
65 * Return: A pointer to the newly allocated regmap, or NULL on error.
67 static struct regmap *regmap_alloc(int count)
70 size_t size = sizeof(*map) + sizeof(map->ranges[0]) * count;
72 map = calloc(1, size);
75 map->range_count = count;
76 map->width = REGMAP_SIZE_32;
81 #if CONFIG_IS_ENABLED(OF_PLATDATA)
82 int regmap_init_mem_plat(struct udevice *dev, fdt_val_t *reg, int count,
85 struct regmap_range *range;
88 map = regmap_alloc(count);
92 for (range = map->ranges; count > 0; reg += 2, range++, count--) {
103 * init_range() - Initialize a single range of a regmap
104 * @node: Device node that will use the map in question
105 * @range: Pointer to a regmap_range structure that will be initialized
106 * @addr_len: The length of the addr parts of the reg property
107 * @size_len: The length of the size parts of the reg property
108 * @index: The index of the range to initialize
110 * This function will read the necessary 'reg' information from the device tree
111 * (the 'addr' part, and the 'length' part), and initialize the range in
114 * Return: 0 if OK, -ve on error
116 static int init_range(ofnode node, struct regmap_range *range, int addr_len,
117 int size_len, int index)
122 if (of_live_active()) {
125 ret = of_address_to_resource(ofnode_to_np(node),
128 debug("%s: Could not read resource of range %d (ret = %d)\n",
129 ofnode_get_name(node), index, ret);
133 range->start = r.start;
134 range->size = r.end - r.start + 1;
136 int offset = ofnode_to_offset(node);
138 range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob, offset,
142 if (range->start == FDT_ADDR_T_NONE) {
143 debug("%s: Could not read start of range %d\n",
144 ofnode_get_name(node), index);
154 int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index)
157 int addr_len, size_len;
160 addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
162 debug("%s: Error while reading the addr length (ret = %d)\n",
163 ofnode_get_name(node), addr_len);
167 size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
169 debug("%s: Error while reading the size length: (ret = %d)\n",
170 ofnode_get_name(node), size_len);
174 map = regmap_alloc(1);
178 ret = init_range(node, map->ranges, addr_len, size_len, index);
182 if (ofnode_read_bool(node, "little-endian"))
183 map->endianness = REGMAP_LITTLE_ENDIAN;
184 else if (ofnode_read_bool(node, "big-endian"))
185 map->endianness = REGMAP_BIG_ENDIAN;
186 else if (ofnode_read_bool(node, "native-endian"))
187 map->endianness = REGMAP_NATIVE_ENDIAN;
188 else /* Default: native endianness */
189 map->endianness = REGMAP_NATIVE_ENDIAN;
200 int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size,
201 struct regmap **mapp)
204 struct regmap_range *range;
206 map = regmap_alloc(1);
210 range = &map->ranges[0];
211 range->start = r_start;
212 range->size = r_size;
214 if (ofnode_read_bool(node, "little-endian"))
215 map->endianness = REGMAP_LITTLE_ENDIAN;
216 else if (ofnode_read_bool(node, "big-endian"))
217 map->endianness = REGMAP_BIG_ENDIAN;
218 else if (ofnode_read_bool(node, "native-endian"))
219 map->endianness = REGMAP_NATIVE_ENDIAN;
220 else /* Default: native endianness */
221 map->endianness = REGMAP_NATIVE_ENDIAN;
227 int regmap_init_mem(ofnode node, struct regmap **mapp)
229 struct regmap_range *range;
232 int addr_len, size_len, both_len;
237 addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
239 debug("%s: Error while reading the addr length (ret = %d)\n",
240 ofnode_get_name(node), addr_len);
244 size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
246 debug("%s: Error while reading the size length: (ret = %d)\n",
247 ofnode_get_name(node), size_len);
251 both_len = addr_len + size_len;
253 debug("%s: Both addr and size length are zero\n",
254 ofnode_get_name(node));
258 len = ofnode_read_size(node, "reg");
260 debug("%s: Error while reading reg size (ret = %d)\n",
261 ofnode_get_name(node), len);
264 len /= sizeof(fdt32_t);
265 count = len / both_len;
267 debug("%s: Not enough data in reg property\n",
268 ofnode_get_name(node));
272 map = regmap_alloc(count);
276 for (range = map->ranges, index = 0; count > 0;
277 count--, range++, index++) {
278 ret = init_range(node, range, addr_len, size_len, index);
283 if (ofnode_read_bool(node, "little-endian"))
284 map->endianness = REGMAP_LITTLE_ENDIAN;
285 else if (ofnode_read_bool(node, "big-endian"))
286 map->endianness = REGMAP_BIG_ENDIAN;
287 else if (ofnode_read_bool(node, "native-endian"))
288 map->endianness = REGMAP_NATIVE_ENDIAN;
289 else /* Default: native endianness */
290 map->endianness = REGMAP_NATIVE_ENDIAN;
301 static void devm_regmap_release(struct udevice *dev, void *res)
303 regmap_uninit(*(struct regmap **)res);
306 struct regmap *devm_regmap_init(struct udevice *dev,
307 const struct regmap_bus *bus,
309 const struct regmap_config *config)
312 struct regmap **mapp, *map;
314 /* this looks like a leak, but devres takes care of it */
315 mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *),
318 return ERR_PTR(-ENOMEM);
320 if (config && config->r_size != 0)
321 rc = regmap_init_mem_range(dev_ofnode(dev), config->r_start,
322 config->r_size, mapp);
324 rc = regmap_init_mem(dev_ofnode(dev), mapp);
330 map->width = config->width;
331 map->reg_offset_shift = config->reg_offset_shift;
334 devres_add(dev, mapp);
339 void *regmap_get_range(struct regmap *map, unsigned int range_num)
341 struct regmap_range *range;
343 if (range_num >= map->range_count)
345 range = &map->ranges[range_num];
347 return map_sysmem(range->start, range->size);
350 int regmap_uninit(struct regmap *map)
357 static inline u8 __read_8(u8 *addr, enum regmap_endianness_t endianness)
362 static inline u16 __read_16(u16 *addr, enum regmap_endianness_t endianness)
364 switch (endianness) {
365 case REGMAP_LITTLE_ENDIAN:
366 return in_le16(addr);
367 case REGMAP_BIG_ENDIAN:
368 return in_be16(addr);
369 case REGMAP_NATIVE_ENDIAN:
376 static inline u32 __read_32(u32 *addr, enum regmap_endianness_t endianness)
378 switch (endianness) {
379 case REGMAP_LITTLE_ENDIAN:
380 return in_le32(addr);
381 case REGMAP_BIG_ENDIAN:
382 return in_be32(addr);
383 case REGMAP_NATIVE_ENDIAN:
390 #if defined(in_le64) && defined(in_be64) && defined(readq)
391 static inline u64 __read_64(u64 *addr, enum regmap_endianness_t endianness)
393 switch (endianness) {
394 case REGMAP_LITTLE_ENDIAN:
395 return in_le64(addr);
396 case REGMAP_BIG_ENDIAN:
397 return in_be64(addr);
398 case REGMAP_NATIVE_ENDIAN:
406 int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
407 void *valp, size_t val_len)
409 struct regmap_range *range;
412 if (do_range_check() && range_num >= map->range_count) {
413 debug("%s: range index %d larger than range count\n",
414 __func__, range_num);
417 range = &map->ranges[range_num];
419 offset <<= map->reg_offset_shift;
420 if (do_range_check() &&
421 (offset + val_len > range->size || offset + val_len < offset)) {
422 debug("%s: offset/size combination invalid\n", __func__);
426 ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
430 *((u8 *)valp) = __read_8(ptr, map->endianness);
433 *((u16 *)valp) = __read_16(ptr, map->endianness);
436 *((u32 *)valp) = __read_32(ptr, map->endianness);
438 #if defined(in_le64) && defined(in_be64) && defined(readq)
440 *((u64 *)valp) = __read_64(ptr, map->endianness);
444 debug("%s: regmap size %zu unknown\n", __func__, val_len);
451 int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
453 return regmap_raw_read_range(map, 0, offset, valp, val_len);
456 int regmap_read(struct regmap *map, uint offset, uint *valp)
466 res = regmap_raw_read(map, offset, &u, map->width);
470 switch (map->width) {
490 static inline void __write_8(u8 *addr, const u8 *val,
491 enum regmap_endianness_t endianness)
496 static inline void __write_16(u16 *addr, const u16 *val,
497 enum regmap_endianness_t endianness)
499 switch (endianness) {
500 case REGMAP_NATIVE_ENDIAN:
503 case REGMAP_LITTLE_ENDIAN:
504 out_le16(addr, *val);
506 case REGMAP_BIG_ENDIAN:
507 out_be16(addr, *val);
512 static inline void __write_32(u32 *addr, const u32 *val,
513 enum regmap_endianness_t endianness)
515 switch (endianness) {
516 case REGMAP_NATIVE_ENDIAN:
519 case REGMAP_LITTLE_ENDIAN:
520 out_le32(addr, *val);
522 case REGMAP_BIG_ENDIAN:
523 out_be32(addr, *val);
528 #if defined(out_le64) && defined(out_be64) && defined(writeq)
529 static inline void __write_64(u64 *addr, const u64 *val,
530 enum regmap_endianness_t endianness)
532 switch (endianness) {
533 case REGMAP_NATIVE_ENDIAN:
536 case REGMAP_LITTLE_ENDIAN:
537 out_le64(addr, *val);
539 case REGMAP_BIG_ENDIAN:
540 out_be64(addr, *val);
546 int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
547 const void *val, size_t val_len)
549 struct regmap_range *range;
552 if (range_num >= map->range_count) {
553 debug("%s: range index %d larger than range count\n",
554 __func__, range_num);
557 range = &map->ranges[range_num];
559 offset <<= map->reg_offset_shift;
560 if (offset + val_len > range->size || offset + val_len < offset) {
561 debug("%s: offset/size combination invalid\n", __func__);
565 ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
569 __write_8(ptr, val, map->endianness);
572 __write_16(ptr, val, map->endianness);
575 __write_32(ptr, val, map->endianness);
577 #if defined(out_le64) && defined(out_be64) && defined(writeq)
579 __write_64(ptr, val, map->endianness);
583 debug("%s: regmap size %zu unknown\n", __func__, val_len);
590 int regmap_raw_write(struct regmap *map, uint offset, const void *val,
593 return regmap_raw_write_range(map, 0, offset, val, val_len);
596 int regmap_write(struct regmap *map, uint offset, uint val)
605 switch (map->width) {
619 debug("%s: regmap size %zu unknown\n", __func__,
624 return regmap_raw_write(map, offset, &u, map->width);
627 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
632 ret = regmap_read(map, offset, ®);
638 return regmap_write(map, offset, reg | (val & mask));
641 int regmap_field_read(struct regmap_field *field, unsigned int *val)
644 unsigned int reg_val;
646 ret = regmap_read(field->regmap, field->reg, ®_val);
650 reg_val &= field->mask;
651 reg_val >>= field->shift;
657 int regmap_field_write(struct regmap_field *field, unsigned int val)
659 return regmap_update_bits(field->regmap, field->reg, field->mask,
660 val << field->shift);
663 static void regmap_field_init(struct regmap_field *rm_field,
664 struct regmap *regmap,
665 struct reg_field reg_field)
667 rm_field->regmap = regmap;
668 rm_field->reg = reg_field.reg;
669 rm_field->shift = reg_field.lsb;
670 rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
673 struct regmap_field *devm_regmap_field_alloc(struct udevice *dev,
674 struct regmap *regmap,
675 struct reg_field reg_field)
677 struct regmap_field *rm_field = devm_kzalloc(dev, sizeof(*rm_field),
680 return ERR_PTR(-ENOMEM);
682 regmap_field_init(rm_field, regmap, reg_field);
687 void devm_regmap_field_free(struct udevice *dev, struct regmap_field *field)
689 devm_kfree(dev, field);
692 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
693 struct reg_field reg_field)
695 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
698 return ERR_PTR(-ENOMEM);
700 regmap_field_init(rm_field, regmap, reg_field);
705 void regmap_field_free(struct regmap_field *field)