1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
11 * struct regmap_range - a register map range
13 * @start: Start address
14 * @size: Size in bytes
22 * struct regmap - a way of accessing hardware/bus registers
24 * @base: Base address of register map
25 * @range_count: Number of ranges available within the map
26 * @range: Pointer to the list of ranges, allocated if @range_count > 1
27 * @base_range: If @range_count is <= 1, @range points here
32 struct regmap_range *range, base_range;
36 * Interface to provide access to registers either through a direct memory
37 * bus or through a peripheral bus like I2C, SPI.
39 int regmap_write(struct regmap *map, uint offset, uint val);
40 int regmap_read(struct regmap *map, uint offset, uint *valp);
42 #define regmap_write32(map, ptr, member, val) \
43 regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
45 #define regmap_read32(map, ptr, member, valp) \
46 regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
49 * regmap_init_mem() - Set up a new register map that uses memory access
51 * Use regmap_uninit() to free it.
53 * @dev: Device that uses this map
54 * @mapp: Returns allocated map
56 int regmap_init_mem(struct udevice *dev, struct regmap **mapp);
59 * regmap_init_mem_platdata() - Set up a new memory register map for of-platdata
61 * This creates a new regmap with a list of regions passed in, rather than
62 * using the device tree. It only supports 32-bit machines.
64 * Use regmap_uninit() to free it.
66 * @dev: Device that uses this map
67 * @reg: List of address, size pairs
68 * @count: Number of pairs (e.g. 1 if the regmap has a single entry)
69 * @mapp: Returns allocated map
71 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
72 struct regmap **mapp);
75 * regmap_get_range() - Obtain the base memory address of a regmap range
77 * @map: Regmap to query
78 * @range_num: Range to look up
80 void *regmap_get_range(struct regmap *map, unsigned int range_num);
83 * regmap_uninit() - free a previously inited regmap
85 int regmap_uninit(struct regmap *map);