8a8d24bdf1
Try to maintain some consistency between these variables by using _plat as a suffix for them. Signed-off-by: Simon Glass <sjg@chromium.org>
533 lines
17 KiB
C
533 lines
17 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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#include <linux/delay.h>
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/**
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* DOC: Overview
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*
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* Regmaps are an abstraction mechanism that allows device drivers to access
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* register maps irrespective of the underlying bus architecture. This entails
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* that for devices that support multiple busses (e.g. I2C and SPI for a GPIO
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* expander chip) only one driver has to be written. This driver will
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* instantiate a regmap with a backend depending on the bus the device is
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* attached to, and use the regmap API to access the register map through that
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* bus transparently.
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*
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* Read and write functions are supplied, which can read/write data of
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* arbitrary length from/to the regmap.
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*
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* The endianness of regmap accesses is selectable for each map through device
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* tree settings via the boolean "little-endian", "big-endian", and
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* "native-endian" properties.
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*
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* Furthermore, the register map described by a regmap can be split into
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* multiple disjoint areas called ranges. In this way, register maps with
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* "holes", i.e. areas of addressable memory that are not part of the register
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* map, can be accessed in a concise manner.
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*
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* Currently, only a bare "mem" backend for regmaps is supported, which
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* accesses the register map as regular IO-mapped memory.
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*/
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/**
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* enum regmap_size_t - Access sizes for regmap reads and writes
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*
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* @REGMAP_SIZE_8: 8-bit read/write access size
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* @REGMAP_SIZE_16: 16-bit read/write access size
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* @REGMAP_SIZE_32: 32-bit read/write access size
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* @REGMAP_SIZE_64: 64-bit read/write access size
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*/
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enum regmap_size_t {
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REGMAP_SIZE_8 = 1,
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REGMAP_SIZE_16 = 2,
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REGMAP_SIZE_32 = 4,
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REGMAP_SIZE_64 = 8,
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};
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/**
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* enum regmap_endianness_t - Endianness for regmap reads and writes
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*
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* @REGMAP_NATIVE_ENDIAN: Native endian read/write accesses
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* @REGMAP_LITTLE_ENDIAN: Little endian read/write accesses
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* @REGMAP_BIG_ENDIAN: Big endian read/write accesses
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*/
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enum regmap_endianness_t {
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REGMAP_NATIVE_ENDIAN,
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REGMAP_LITTLE_ENDIAN,
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REGMAP_BIG_ENDIAN,
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};
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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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struct regmap_bus;
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/**
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* struct regmap_config - Configure the behaviour of a regmap
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*
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* @width: Width of the read/write operations. Defaults to
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* REGMAP_SIZE_32 if set to 0.
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* @reg_offset_shift Left shift the register offset by this value before
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* performing read or write.
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* @r_start: If specified, the regmap is created with one range
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* which starts at this address, instead of finding the
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* start from device tree.
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* @r_size: Same as above for the range size
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*/
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struct regmap_config {
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enum regmap_size_t width;
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u32 reg_offset_shift;
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ulong r_start;
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ulong r_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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* @width: Width of the read/write operations. Defaults to
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* REGMAP_SIZE_32 if set to 0.
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* @reg_offset_shift Left shift the register offset by this value before
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* performing read or write.
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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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enum regmap_endianness_t endianness;
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enum regmap_size_t width;
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u32 reg_offset_shift;
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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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/**
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* regmap_write() - Write a value to a regmap
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*
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* @map: Regmap to write to
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* @offset: Offset in the regmap to write to
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* @val: Data to write to the regmap at the specified offset
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_write(struct regmap *map, uint offset, uint val);
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/**
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* regmap_read() - Read a value from a regmap
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*
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* @map: Regmap to read from
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* @offset: Offset in the regmap to read from
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* @valp: Pointer to the buffer to receive the data read from the regmap
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* at the specified offset
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_read(struct regmap *map, uint offset, uint *valp);
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/**
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* regmap_raw_write() - Write a value of specified length to a regmap
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*
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* @map: Regmap to write to
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* @offset: Offset in the regmap to write to
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* @val: Value to write to the regmap at the specified offset
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* @val_len: Length of the data to be written to the regmap
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*
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* Note that this function will, as opposed to regmap_write, write data of
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* arbitrary length to the regmap, and not just the size configured in the
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* regmap (defaults to 32-bit) and is thus a generalized version of
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* regmap_write.
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_raw_write(struct regmap *map, uint offset, const void *val,
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size_t val_len);
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/**
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* regmap_raw_read() - Read a value of specified length from a regmap
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*
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* @map: Regmap to read from
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* @offset: Offset in the regmap to read from
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* @valp: Pointer to the buffer to receive the data read from the regmap
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* at the specified offset
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* @val_len: Length of the data to be read from the regmap
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*
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* Note that this function will, as opposed to regmap_read, read data of
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* arbitrary length from the regmap, and not just the size configured in the
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* regmap (defaults to 32-bit) and is thus a generalized version of
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* regmap_read.
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_raw_read(struct regmap *map, uint offset, void *valp,
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size_t val_len);
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/**
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* regmap_raw_write_range() - Write a value of specified length to a range of a
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* regmap
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*
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* @map: Regmap to write to
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* @range_num: Number of the range in the regmap to write to
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* @offset: Offset in the regmap to write to
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* @val: Value to write to the regmap at the specified offset
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* @val_len: Length of the data to be written to the regmap
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
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const void *val, size_t val_len);
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/**
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* regmap_raw_read_range() - Read a value of specified length from a range of a
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* regmap
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*
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* @map: Regmap to read from
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* @range_num: Number of the range in the regmap to write to
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* @offset: Offset in the regmap to read from
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* @valp: Pointer to the buffer to receive the data read from the regmap
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* at the specified offset
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* @val_len: Length of the data to be read from the regmap
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*
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* Return: 0 if OK, -ve on error
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*/
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int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
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void *valp, size_t val_len);
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/**
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* regmap_range_set() - Set a value in a regmap range described by a struct
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* @map: Regmap in which a value should be set
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* @range: Range of the regmap in which a value should be set
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* @type: Structure type that describes the memory layout of the regmap range
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* @member: Member of the describing structure that should be set in the regmap
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* range
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* @val: Value which should be written to the regmap range
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*/
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#define regmap_range_set(map, range, type, member, val) \
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do { \
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typeof(((type *)0)->member) __tmp = val; \
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regmap_raw_write_range(map, range, offsetof(type, member), \
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&__tmp, sizeof(((type *)0)->member)); \
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} while (0)
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/**
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* regmap_set() - Set a value in a regmap described by a struct
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* @map: Regmap in which a value should be set
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* @type: Structure type that describes the memory layout of the regmap
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* @member: Member of the describing structure that should be set in the regmap
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* @val: Value which should be written to the regmap
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*/
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#define regmap_set(map, type, member, val) \
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regmap_range_set(map, 0, type, member, val)
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/**
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* regmap_range_get() - Get a value from a regmap range described by a struct
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* @map: Regmap from which a value should be read
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* @range: Range of the regmap from which a value should be read
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* @type: Structure type that describes the memory layout of the regmap
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* range
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* @member: Member of the describing structure that should be read in the
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* regmap range
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* @valp: Variable that receives the value read from the regmap range
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*/
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#define regmap_range_get(map, range, type, member, valp) \
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regmap_raw_read_range(map, range, offsetof(type, member), \
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(void *)valp, sizeof(((type *)0)->member))
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/**
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* regmap_get() - Get a value from a regmap described by a struct
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* @map: Regmap from which a value should be read
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* @type: Structure type that describes the memory layout of the regmap
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* range
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* @member: Member of the describing structure that should be read in the
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* regmap
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* @valp: Variable that receives the value read from the regmap
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*/
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#define regmap_get(map, type, member, valp) \
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regmap_range_get(map, 0, type, member, valp)
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/**
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* regmap_read_poll_timeout - Poll until a condition is met or a timeout occurs
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*
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* @map: Regmap to read from
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* @addr: Offset to poll
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* @val: Unsigned integer variable to read the value into
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* @cond: Break condition (usually involving @val)
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* @sleep_us: Maximum time to sleep between reads in us (0 tight-loops).
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* @timeout_ms: Timeout in ms, 0 means never timeout
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* @test_add_time: Used for sandbox testing - amount of time to add after
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* starting the loop (0 if not testing)
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*
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* Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_read
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* error return value in case of a error read. In the two former cases,
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* the last read value at @addr is stored in @val. Must not be called
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* from atomic context if sleep_us or timeout_us are used.
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*
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* This is modelled after the regmap_read_poll_timeout macros in linux but
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* with millisecond timeout.
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*
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* The _test version is for sandbox testing only. Do not use this in normal
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* code as it advances the timer.
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*/
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#define regmap_read_poll_timeout_test(map, addr, val, cond, sleep_us, \
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timeout_ms, test_add_time) \
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({ \
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unsigned long __start = get_timer(0); \
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int __ret; \
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for (;;) { \
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__ret = regmap_read((map), (addr), &(val)); \
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if (__ret) \
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break; \
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if (cond) \
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break; \
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if (IS_ENABLED(CONFIG_SANDBOX) && test_add_time) \
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timer_test_add_offset(test_add_time); \
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if ((timeout_ms) && get_timer(__start) > (timeout_ms)) { \
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__ret = regmap_read((map), (addr), &(val)); \
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break; \
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} \
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if ((sleep_us)) \
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udelay((sleep_us)); \
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} \
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__ret ?: ((cond) ? 0 : -ETIMEDOUT); \
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})
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#define regmap_read_poll_timeout(map, addr, val, cond, sleep_us, timeout_ms) \
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regmap_read_poll_timeout_test(map, addr, val, cond, sleep_us, \
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timeout_ms, 0) \
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/**
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* regmap_field_read_poll_timeout - Poll until a condition is met or a timeout
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* occurs
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*
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* @field: Regmap field to read from
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* @val: Unsigned integer variable to read the value into
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* @cond: Break condition (usually involving @val)
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* @sleep_us: Maximum time to sleep between reads in us (0 tight-loops).
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* @timeout_ms: Timeout in ms, 0 means never timeout
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*
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* Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_field_read
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* error return value in case of a error read. In the two former cases,
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* the last read value at @addr is stored in @val.
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*
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* This is modelled after the regmap_read_poll_timeout macros in linux but
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* with millisecond timeout.
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*/
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#define regmap_field_read_poll_timeout(field, val, cond, sleep_us, timeout_ms) \
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({ \
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unsigned long __start = get_timer(0); \
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int __ret; \
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for (;;) { \
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__ret = regmap_field_read((field), &(val)); \
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if (__ret) \
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break; \
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if (cond) \
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break; \
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if ((timeout_ms) && get_timer(__start) > (timeout_ms)) { \
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__ret = regmap_field_read((field), &(val)); \
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break; \
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} \
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if ((sleep_us)) \
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udelay((sleep_us)); \
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} \
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__ret ?: ((cond) ? 0 : -ETIMEDOUT); \
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})
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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 OR with the read value after masking. Note that any
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* bits set in @val which are not set in @mask are ignored
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* Return: 0 if OK, -ve on error
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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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* @node: Device node that uses this map
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* @mapp: Returns allocated map
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* Return: 0 if OK, -ve on error
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*
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* Use regmap_uninit() to free it.
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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_plat() - Set up a new memory register map for
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* of-platdata
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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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* Return: 0 if OK, -ve on error
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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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*/
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int regmap_init_mem_plat(struct udevice *dev, fdt_val_t *reg, int count,
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struct regmap **mapp);
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int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index);
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/**
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* regmap_init_mem_range() - Set up a new memory region for ofnode with the
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* specified range.
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*
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* @node: The ofnode for the map.
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* @r_start: Start of the range.
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* @r_size: Size of the range.
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* @mapp: Returns allocated map.
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*
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* Return: 0 in success, -errno otherwise
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*
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* This creates a regmap with one range where instead of extracting the range
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* from 'node', it is created based on the parameters specified. This is
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* useful when a driver needs to calculate the base of the regmap at runtime,
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* and can't specify it in device tree.
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*/
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int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size,
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struct regmap **mapp);
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/**
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* devm_regmap_init() - Initialise register map (device managed)
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*
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* @dev: Device that will be interacted with
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* @bus: Bus-specific callbacks to use with device (IGNORED)
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* @bus_context: Data passed to bus-specific callbacks (IGNORED)
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* @config: Configuration for register map
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*
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* @Return a valid pointer to a struct regmap or a ERR_PTR() on error.
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* The structure is automatically freed when the device is unbound
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*/
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struct regmap *devm_regmap_init(struct udevice *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config);
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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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* Return: Pointer to the range in question if OK, NULL on error
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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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* @map: Regmap to free
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* Return: 0 if OK, -ve on error
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*/
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int regmap_uninit(struct regmap *map);
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/**
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* struct reg_field - Description of an register field
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*
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* @reg: Offset of the register within the regmap bank
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* @lsb: lsb of the register field.
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* @msb: msb of the register field.
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*/
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struct reg_field {
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unsigned int reg;
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unsigned int lsb;
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unsigned int msb;
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};
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struct regmap_field;
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/**
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* REG_FIELD() - A convenient way to initialize a 'struct reg_feild'.
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*
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* @_reg: Offset of the register within the regmap bank
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* @_lsb: lsb of the register field.
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* @_msb: msb of the register field.
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*
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* Register fields are often described in terms of 3 things: the register it
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* belongs to, its LSB, and its MSB. This macro can be used by drivers to
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* clearly and easily initialize a 'struct regmap_field'.
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*
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* For example, say a device has a register at offset DEV_REG1 (0x100) and a
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* field of DEV_REG1 is on bits [7:3]. So a driver can initialize a regmap
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* field for this by doing:
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* struct reg_field field = REG_FIELD(DEV_REG1, 3, 7);
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*/
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#define REG_FIELD(_reg, _lsb, _msb) { \
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.reg = _reg, \
|
|
.lsb = _lsb, \
|
|
.msb = _msb, \
|
|
}
|
|
|
|
/**
|
|
* devm_regmap_field_alloc() - Allocate and initialise a register field.
|
|
*
|
|
* @dev: Device that will be interacted with
|
|
* @regmap: regmap bank in which this register field is located.
|
|
* @reg_field: Register field with in the bank.
|
|
*
|
|
* The return value will be an ERR_PTR() on error or a valid pointer
|
|
* to a struct regmap_field. The regmap_field will be automatically freed
|
|
* by the device management code.
|
|
*/
|
|
struct regmap_field *devm_regmap_field_alloc(struct udevice *dev,
|
|
struct regmap *regmap,
|
|
struct reg_field reg_field);
|
|
/**
|
|
* devm_regmap_field_free() - Free a register field allocated using
|
|
* devm_regmap_field_alloc.
|
|
*
|
|
* @dev: Device that will be interacted with
|
|
* @field: regmap field which should be freed.
|
|
*
|
|
* Free register field allocated using devm_regmap_field_alloc(). Usually
|
|
* drivers need not call this function, as the memory allocated via devm
|
|
* will be freed as per device-driver life-cyle.
|
|
*/
|
|
void devm_regmap_field_free(struct udevice *dev, struct regmap_field *field);
|
|
|
|
/**
|
|
* regmap_field_write() - Write a value to a regmap field
|
|
*
|
|
* @field: Regmap field to write to
|
|
* @val: Data to write to the regmap at the specified offset
|
|
*
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int regmap_field_write(struct regmap_field *field, unsigned int val);
|
|
|
|
/**
|
|
* regmap_read() - Read a 32-bit value from a regmap
|
|
*
|
|
* @field: Regmap field to write to
|
|
* @valp: Pointer to the buffer to receive the data read from the regmap
|
|
* field
|
|
*
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int regmap_field_read(struct regmap_field *field, unsigned int *val);
|
|
|
|
#endif
|