1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (c) 2015 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7 #ifndef __REGMAP_H 8 #define __REGMAP_H 9 10 /** 11 * struct regmap_range - a register map range 12 * 13 * @start: Start address 14 * @size: Size in bytes 15 */ 16 struct regmap_range { 17 ulong start; 18 ulong size; 19 }; 20 21 /** 22 * struct regmap - a way of accessing hardware/bus registers 23 * 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 28 */ 29 struct regmap { 30 phys_addr_t base; 31 int range_count; 32 struct regmap_range *range, base_range; 33 }; 34 35 /* 36 * Interface to provide access to registers either through a direct memory 37 * bus or through a peripheral bus like I2C, SPI. 38 */ 39 int regmap_write(struct regmap *map, uint offset, uint val); 40 int regmap_read(struct regmap *map, uint offset, uint *valp); 41 42 #define regmap_write32(map, ptr, member, val) \ 43 regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val) 44 45 #define regmap_read32(map, ptr, member, valp) \ 46 regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp) 47 48 /** 49 * regmap_init_mem() - Set up a new register map that uses memory access 50 * 51 * Use regmap_uninit() to free it. 52 * 53 * @dev: Device that uses this map 54 * @mapp: Returns allocated map 55 */ 56 int regmap_init_mem(struct udevice *dev, struct regmap **mapp); 57 58 /** 59 * regmap_init_mem_platdata() - Set up a new memory register map for of-platdata 60 * 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. 63 * 64 * Use regmap_uninit() to free it. 65 * 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 70 */ 71 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count, 72 struct regmap **mapp); 73 74 /** 75 * regmap_get_range() - Obtain the base memory address of a regmap range 76 * 77 * @map: Regmap to query 78 * @range_num: Range to look up 79 */ 80 void *regmap_get_range(struct regmap *map, unsigned int range_num); 81 82 /** 83 * regmap_uninit() - free a previously inited regmap 84 */ 85 int regmap_uninit(struct regmap *map); 86 87 #endif 88