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 * @range_count: Number of ranges available within the map 25 * @ranges: Array of ranges 26 */ 27 struct regmap { 28 int range_count; 29 struct regmap_range ranges[0]; 30 }; 31 32 /* 33 * Interface to provide access to registers either through a direct memory 34 * bus or through a peripheral bus like I2C, SPI. 35 */ 36 int regmap_write(struct regmap *map, uint offset, uint val); 37 int regmap_read(struct regmap *map, uint offset, uint *valp); 38 39 #define regmap_write32(map, ptr, member, val) \ 40 regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val) 41 42 #define regmap_read32(map, ptr, member, valp) \ 43 regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp) 44 45 /** 46 * regmap_init_mem() - Set up a new register map that uses memory access 47 * 48 * Use regmap_uninit() to free it. 49 * 50 * @node: Device node that uses this map 51 * @mapp: Returns allocated map 52 */ 53 int regmap_init_mem(ofnode node, struct regmap **mapp); 54 55 /** 56 * regmap_init_mem_platdata() - Set up a new memory register map for of-platdata 57 * 58 * This creates a new regmap with a list of regions passed in, rather than 59 * using the device tree. It only supports 32-bit machines. 60 * 61 * Use regmap_uninit() to free it. 62 * 63 * @dev: Device that uses this map 64 * @reg: List of address, size pairs 65 * @count: Number of pairs (e.g. 1 if the regmap has a single entry) 66 * @mapp: Returns allocated map 67 */ 68 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count, 69 struct regmap **mapp); 70 71 /** 72 * regmap_get_range() - Obtain the base memory address of a regmap range 73 * 74 * @map: Regmap to query 75 * @range_num: Range to look up 76 */ 77 void *regmap_get_range(struct regmap *map, unsigned int range_num); 78 79 /** 80 * regmap_uninit() - free a previously inited regmap 81 */ 82 int regmap_uninit(struct regmap *map); 83 84 #endif 85