1 /* 2 * Copyright (c) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #ifndef __REGMAP_H 9 #define __REGMAP_H 10 11 /** 12 * struct regmap_range - a register map range 13 * 14 * @start: Start address 15 * @size: Size in bytes 16 */ 17 struct regmap_range { 18 ulong start; 19 ulong size; 20 }; 21 22 /** 23 * struct regmap - a way of accessing hardware/bus registers 24 * 25 * @base: Base address of register map 26 * @range_count: Number of ranges available within the map 27 * @range: Pointer to the list of ranges, allocated if @range_count > 1 28 * @base_range: If @range_count is <= 1, @range points here 29 */ 30 struct regmap { 31 phys_addr_t base; 32 int range_count; 33 struct regmap_range *range, base_range; 34 }; 35 36 /* 37 * Interface to provide access to registers either through a direct memory 38 * bus or through a peripheral bus like I2C, SPI. 39 */ 40 int regmap_write(struct regmap *map, uint offset, uint val); 41 int regmap_read(struct regmap *map, uint offset, uint *valp); 42 43 #define regmap_write32(map, ptr, member, val) \ 44 regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val) 45 46 #define regmap_read32(map, ptr, member, valp) \ 47 regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp) 48 49 /** 50 * regmap_init_mem() - Set up a new register map that uses memory access 51 * 52 * Use regmap_uninit() to free it. 53 * 54 * @dev: Device that uses this map 55 * @mapp: Returns allocated map 56 */ 57 int regmap_init_mem(struct udevice *dev, struct regmap **mapp); 58 59 /** 60 * regmap_init_mem_platdata() - Set up a new memory register map for of-platdata 61 * 62 * This creates a new regmap with a list of regions passed in, rather than 63 * using the device tree. It only supports 32-bit machines. 64 * 65 * Use regmap_uninit() to free it. 66 * 67 * @dev: Device that uses this map 68 * @reg: List of address, size pairs 69 * @count: Number of pairs (e.g. 1 if the regmap has a single entry) 70 * @mapp: Returns allocated map 71 */ 72 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count, 73 struct regmap **mapp); 74 75 /** 76 * regmap_get_range() - Obtain the base memory address of a regmap range 77 * 78 * @map: Regmap to query 79 * @range_num: Range to look up 80 */ 81 void *regmap_get_range(struct regmap *map, unsigned int range_num); 82 83 /** 84 * regmap_uninit() - free a previously inited regmap 85 */ 86 int regmap_uninit(struct regmap *map); 87 88 #endif 89