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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>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __REGMAP_H
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#define __REGMAP_H
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/**
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* struct regmap_range - a register map range
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*
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* @start: Start address
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* @size: Size in bytes
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*/
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struct regmap_range {
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ulong start;
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ulong size;
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};
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/**
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* struct regmap - a way of accessing hardware/bus registers
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*
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* @range_count: Number of ranges available within the map
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* @ranges: Array of ranges
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*/
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struct regmap {
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int range_count;
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struct regmap_range ranges[0];
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};
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/*
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* Interface to provide access to registers either through a direct memory
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* bus or through a peripheral bus like I2C, SPI.
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*/
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int regmap_write(struct regmap *map, uint offset, uint val);
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int regmap_read(struct regmap *map, uint offset, uint *valp);
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#define regmap_write32(map, ptr, member, val) \
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regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
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#define regmap_read32(map, ptr, member, valp) \
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regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
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/**
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* regmap_update_bits() - Perform a read/modify/write using a mask
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*
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* @map: The map returned by regmap_init_mem*()
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* @offset: Offset of the memory
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* @mask: Mask to apply to the read value
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* @val: Value to apply to the value to write
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*/
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int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val);
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/**
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* regmap_init_mem() - Set up a new register map that uses memory access
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*
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* Use regmap_uninit() to free it.
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*
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* @node: Device node that uses this map
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* @mapp: Returns allocated map
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*/
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int regmap_init_mem(ofnode node, struct regmap **mapp);
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/**
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* regmap_init_mem_platdata() - Set up a new memory register map for of-platdata
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*
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* This creates a new regmap with a list of regions passed in, rather than
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* using the device tree. It only supports 32-bit machines.
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*
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* Use regmap_uninit() to free it.
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*
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* @dev: Device that uses this map
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* @reg: List of address, size pairs
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* @count: Number of pairs (e.g. 1 if the regmap has a single entry)
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* @mapp: Returns allocated map
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*/
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int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
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struct regmap **mapp);
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/**
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* regmap_get_range() - Obtain the base memory address of a regmap range
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*
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* @map: Regmap to query
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* @range_num: Range to look up
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*/
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void *regmap_get_range(struct regmap *map, unsigned int range_num);
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/**
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* regmap_uninit() - free a previously inited regmap
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*/
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int regmap_uninit(struct regmap *map);
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#endif
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