1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
11 #include <linux/libfdt.h>
16 #include <dm/of_addr.h>
17 #include <dm/devres.h>
18 #include <linux/ioport.h>
19 #include <linux/compat.h>
20 #include <linux/err.h>
22 DECLARE_GLOBAL_DATA_PTR;
25 * regmap_alloc() - Allocate a regmap with a given number of ranges.
27 * @count: Number of ranges to be allocated for the regmap.
28 * Return: A pointer to the newly allocated regmap, or NULL on error.
30 static struct regmap *regmap_alloc(int count)
33 size_t size = sizeof(*map) + sizeof(map->ranges[0]) * count;
35 map = calloc(1, size);
38 map->range_count = count;
43 #if CONFIG_IS_ENABLED(OF_PLATDATA)
44 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
47 struct regmap_range *range;
50 map = regmap_alloc(count);
54 for (range = map->ranges; count > 0; reg += 2, range++, count--) {
65 * init_range() - Initialize a single range of a regmap
66 * @node: Device node that will use the map in question
67 * @range: Pointer to a regmap_range structure that will be initialized
68 * @addr_len: The length of the addr parts of the reg property
69 * @size_len: The length of the size parts of the reg property
70 * @index: The index of the range to initialize
72 * This function will read the necessary 'reg' information from the device tree
73 * (the 'addr' part, and the 'length' part), and initialize the range in
76 * Return: 0 if OK, -ve on error
78 static int init_range(ofnode node, struct regmap_range *range, int addr_len,
79 int size_len, int index)
84 if (of_live_active()) {
87 ret = of_address_to_resource(ofnode_to_np(node),
90 debug("%s: Could not read resource of range %d (ret = %d)\n",
91 ofnode_get_name(node), index, ret);
95 range->start = r.start;
96 range->size = r.end - r.start + 1;
98 int offset = ofnode_to_offset(node);
100 range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob, offset,
104 if (range->start == FDT_ADDR_T_NONE) {
105 debug("%s: Could not read start of range %d\n",
106 ofnode_get_name(node), index);
116 int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index)
119 int addr_len, size_len;
122 addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
124 debug("%s: Error while reading the addr length (ret = %d)\n",
125 ofnode_get_name(node), addr_len);
129 size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
131 debug("%s: Error while reading the size length: (ret = %d)\n",
132 ofnode_get_name(node), size_len);
136 map = regmap_alloc(1);
140 ret = init_range(node, map->ranges, addr_len, size_len, index);
144 if (ofnode_read_bool(node, "little-endian"))
145 map->endianness = REGMAP_LITTLE_ENDIAN;
146 else if (ofnode_read_bool(node, "big-endian"))
147 map->endianness = REGMAP_BIG_ENDIAN;
148 else if (ofnode_read_bool(node, "native-endian"))
149 map->endianness = REGMAP_NATIVE_ENDIAN;
150 else /* Default: native endianness */
151 map->endianness = REGMAP_NATIVE_ENDIAN;
162 int regmap_init_mem(ofnode node, struct regmap **mapp)
164 struct regmap_range *range;
167 int addr_len, size_len, both_len;
172 addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
174 debug("%s: Error while reading the addr length (ret = %d)\n",
175 ofnode_get_name(node), addr_len);
179 size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
181 debug("%s: Error while reading the size length: (ret = %d)\n",
182 ofnode_get_name(node), size_len);
186 both_len = addr_len + size_len;
188 debug("%s: Both addr and size length are zero\n",
189 ofnode_get_name(node));
193 len = ofnode_read_size(node, "reg");
195 debug("%s: Error while reading reg size (ret = %d)\n",
196 ofnode_get_name(node), len);
199 len /= sizeof(fdt32_t);
200 count = len / both_len;
202 debug("%s: Not enough data in reg property\n",
203 ofnode_get_name(node));
207 map = regmap_alloc(count);
211 for (range = map->ranges, index = 0; count > 0;
212 count--, range++, index++) {
213 ret = init_range(node, range, addr_len, size_len, index);
218 if (ofnode_read_bool(node, "little-endian"))
219 map->endianness = REGMAP_LITTLE_ENDIAN;
220 else if (ofnode_read_bool(node, "big-endian"))
221 map->endianness = REGMAP_BIG_ENDIAN;
222 else if (ofnode_read_bool(node, "native-endian"))
223 map->endianness = REGMAP_NATIVE_ENDIAN;
224 else /* Default: native endianness */
225 map->endianness = REGMAP_NATIVE_ENDIAN;
236 static void devm_regmap_release(struct udevice *dev, void *res)
238 regmap_uninit(*(struct regmap **)res);
241 struct regmap *devm_regmap_init(struct udevice *dev,
242 const struct regmap_bus *bus,
244 const struct regmap_config *config)
247 struct regmap **mapp;
249 mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *),
252 return ERR_PTR(-ENOMEM);
254 rc = regmap_init_mem(dev_ofnode(dev), mapp);
258 devres_add(dev, mapp);
263 void *regmap_get_range(struct regmap *map, unsigned int range_num)
265 struct regmap_range *range;
267 if (range_num >= map->range_count)
269 range = &map->ranges[range_num];
271 return map_sysmem(range->start, range->size);
274 int regmap_uninit(struct regmap *map)
281 static inline u8 __read_8(u8 *addr, enum regmap_endianness_t endianness)
286 static inline u16 __read_16(u16 *addr, enum regmap_endianness_t endianness)
288 switch (endianness) {
289 case REGMAP_LITTLE_ENDIAN:
290 return in_le16(addr);
291 case REGMAP_BIG_ENDIAN:
292 return in_be16(addr);
293 case REGMAP_NATIVE_ENDIAN:
300 static inline u32 __read_32(u32 *addr, enum regmap_endianness_t endianness)
302 switch (endianness) {
303 case REGMAP_LITTLE_ENDIAN:
304 return in_le32(addr);
305 case REGMAP_BIG_ENDIAN:
306 return in_be32(addr);
307 case REGMAP_NATIVE_ENDIAN:
314 #if defined(in_le64) && defined(in_be64) && defined(readq)
315 static inline u64 __read_64(u64 *addr, enum regmap_endianness_t endianness)
317 switch (endianness) {
318 case REGMAP_LITTLE_ENDIAN:
319 return in_le64(addr);
320 case REGMAP_BIG_ENDIAN:
321 return in_be64(addr);
322 case REGMAP_NATIVE_ENDIAN:
330 int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
331 void *valp, size_t val_len)
333 struct regmap_range *range;
336 if (range_num >= map->range_count) {
337 debug("%s: range index %d larger than range count\n",
338 __func__, range_num);
341 range = &map->ranges[range_num];
343 if (offset + val_len > range->size) {
344 debug("%s: offset/size combination invalid\n", __func__);
348 ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
352 *((u8 *)valp) = __read_8(ptr, map->endianness);
355 *((u16 *)valp) = __read_16(ptr, map->endianness);
358 *((u32 *)valp) = __read_32(ptr, map->endianness);
360 #if defined(in_le64) && defined(in_be64) && defined(readq)
362 *((u64 *)valp) = __read_64(ptr, map->endianness);
366 debug("%s: regmap size %zu unknown\n", __func__, val_len);
373 int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
375 return regmap_raw_read_range(map, 0, offset, valp, val_len);
378 int regmap_read(struct regmap *map, uint offset, uint *valp)
380 return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
383 static inline void __write_8(u8 *addr, const u8 *val,
384 enum regmap_endianness_t endianness)
389 static inline void __write_16(u16 *addr, const u16 *val,
390 enum regmap_endianness_t endianness)
392 switch (endianness) {
393 case REGMAP_NATIVE_ENDIAN:
396 case REGMAP_LITTLE_ENDIAN:
397 out_le16(addr, *val);
399 case REGMAP_BIG_ENDIAN:
400 out_be16(addr, *val);
405 static inline void __write_32(u32 *addr, const u32 *val,
406 enum regmap_endianness_t endianness)
408 switch (endianness) {
409 case REGMAP_NATIVE_ENDIAN:
412 case REGMAP_LITTLE_ENDIAN:
413 out_le32(addr, *val);
415 case REGMAP_BIG_ENDIAN:
416 out_be32(addr, *val);
421 #if defined(out_le64) && defined(out_be64) && defined(writeq)
422 static inline void __write_64(u64 *addr, const u64 *val,
423 enum regmap_endianness_t endianness)
425 switch (endianness) {
426 case REGMAP_NATIVE_ENDIAN:
429 case REGMAP_LITTLE_ENDIAN:
430 out_le64(addr, *val);
432 case REGMAP_BIG_ENDIAN:
433 out_be64(addr, *val);
439 int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
440 const void *val, size_t val_len)
442 struct regmap_range *range;
445 if (range_num >= map->range_count) {
446 debug("%s: range index %d larger than range count\n",
447 __func__, range_num);
450 range = &map->ranges[range_num];
452 if (offset + val_len > range->size) {
453 debug("%s: offset/size combination invalid\n", __func__);
457 ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
461 __write_8(ptr, val, map->endianness);
464 __write_16(ptr, val, map->endianness);
467 __write_32(ptr, val, map->endianness);
469 #if defined(out_le64) && defined(out_be64) && defined(writeq)
471 __write_64(ptr, val, map->endianness);
475 debug("%s: regmap size %zu unknown\n", __func__, val_len);
482 int regmap_raw_write(struct regmap *map, uint offset, const void *val,
485 return regmap_raw_write_range(map, 0, offset, val, val_len);
488 int regmap_write(struct regmap *map, uint offset, uint val)
490 return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);
493 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
498 ret = regmap_read(map, offset, ®);
504 return regmap_write(map, offset, reg | (val & mask));