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include/regmap.h
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/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __REGMAP_H
#define __REGMAP_H
/**
* struct regmap_range - a register map range
*
* @start: Start address
* @size: Size in bytes
*/
struct regmap_range {
ulong start;
ulong size;
};
/**
* struct regmap - a way of accessing hardware/bus registers
*
* @base: Base address of register map
* @range_count: Number of ranges available within the map
* @range: Pointer to the list of ranges, allocated if @range_count > 1
* @base_range: If @range_count is <= 1, @range points here
*/
struct regmap {
phys_addr_t base;
int range_count;
struct regmap_range *range, base_range;
};
/*
* Interface to provide access to registers either through a direct memory
* bus or through a peripheral bus like I2C, SPI.
*/
int regmap_write(struct regmap *map, uint offset, uint val);
int regmap_read(struct regmap *map, uint offset, uint *valp);
#define regmap_write32(map, ptr, member, val) \
regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
#define regmap_read32(map, ptr, member, valp) \
regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
/**
* regmap_init_mem() - Set up a new register map that uses memory access
*
* Use regmap_uninit() to free it.
*
* @dev: Device that uses this map
* @mapp: Returns allocated map
*/
int regmap_init_mem(struct udevice *dev, struct regmap **mapp);
/**
* regmap_init_mem_platdata() - Set up a new memory register map for of-platdata
*
* This creates a new regmap with a list of regions passed in, rather than
* using the device tree. It only supports 32-bit machines.
*
* Use regmap_uninit() to free it.
*
* @dev: Device that uses this map
* @reg: List of address, size pairs
* @count: Number of pairs (e.g. 1 if the regmap has a single entry)
* @mapp: Returns allocated map
*/
int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
struct regmap **mapp);
/**
* regmap_get_range() - Obtain the base memory address of a regmap range
*
* @map: Regmap to query
* @range_num: Range to look up
*/
void *regmap_get_range(struct regmap *map, unsigned int range_num);
/**
* regmap_uninit() - free a previously inited regmap
*/
int regmap_uninit(struct regmap *map);
#endif
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