mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 12:33:41 +00:00
285cbcf97f
Add the regmap_update_bits() to simply the read/modify/write of registers in a single command. The function is taken from Linux regmap implementation. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Simon Glass <sjg@chromium.org>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#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
|
|
*
|
|
* @range_count: Number of ranges available within the map
|
|
* @ranges: Array of ranges
|
|
*/
|
|
struct regmap {
|
|
int range_count;
|
|
struct regmap_range ranges[0];
|
|
};
|
|
|
|
/*
|
|
* 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_update_bits() - Perform a read/modify/write using a mask
|
|
*
|
|
* @map: The map returned by regmap_init_mem*()
|
|
* @offset: Offset of the memory
|
|
* @mask: Mask to apply to the read value
|
|
* @val: Value to apply to the value to write
|
|
*/
|
|
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val);
|
|
|
|
/**
|
|
* regmap_init_mem() - Set up a new register map that uses memory access
|
|
*
|
|
* Use regmap_uninit() to free it.
|
|
*
|
|
* @node: Device node that uses this map
|
|
* @mapp: Returns allocated map
|
|
*/
|
|
int regmap_init_mem(ofnode node, 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
|