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 * @range_count: Number of ranges available within the map
25 * @ranges: Array of ranges
29 struct regmap_range ranges[0];
33 * Interface to provide access to registers either through a direct memory
34 * bus or through a peripheral bus like I2C, SPI.
38 * regmap_write() - Write a 32-bit value to a regmap
40 * @map: Regmap to write to
41 * @offset: Offset in the regmap to write to
42 * @val: Data to write to the regmap at the specified offset
44 * Return: 0 if OK, -ve on error
46 int regmap_write(struct regmap *map, uint offset, uint val);
49 * regmap_read() - Read a 32-bit value from a regmap
51 * @map: Regmap to read from
52 * @offset: Offset in the regmap to read from
53 * @valp: Pointer to the buffer to receive the data read from the regmap
54 * at the specified offset
56 * Return: 0 if OK, -ve on error
58 int regmap_read(struct regmap *map, uint offset, uint *valp);
60 #define regmap_write32(map, ptr, member, val) \
61 regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
63 #define regmap_read32(map, ptr, member, valp) \
64 regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
67 * regmap_update_bits() - Perform a read/modify/write using a mask
69 * @map: The map returned by regmap_init_mem*()
70 * @offset: Offset of the memory
71 * @mask: Mask to apply to the read value
72 * @val: Value to apply to the value to write
73 * Return: 0 if OK, -ve on error
75 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val);
78 * regmap_init_mem() - Set up a new register map that uses memory access
80 * @node: Device node that uses this map
81 * @mapp: Returns allocated map
82 * Return: 0 if OK, -ve on error
84 * Use regmap_uninit() to free it.
86 int regmap_init_mem(ofnode node, struct regmap **mapp);
89 * regmap_init_mem_platdata() - Set up a new memory register map for
92 * @dev: Device that uses this map
93 * @reg: List of address, size pairs
94 * @count: Number of pairs (e.g. 1 if the regmap has a single entry)
95 * @mapp: Returns allocated map
96 * Return: 0 if OK, -ve on error
98 * This creates a new regmap with a list of regions passed in, rather than
99 * using the device tree. It only supports 32-bit machines.
101 * Use regmap_uninit() to free it.
104 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
105 struct regmap **mapp);
108 * regmap_get_range() - Obtain the base memory address of a regmap range
110 * @map: Regmap to query
111 * @range_num: Range to look up
112 * Return: Pointer to the range in question if OK, NULL on error
114 void *regmap_get_range(struct regmap *map, unsigned int range_num);
117 * regmap_uninit() - free a previously inited regmap
119 * @map: Regmap to free
120 * Return: 0 if OK, -ve on error
122 int regmap_uninit(struct regmap *map);