df9cf1cc08
At present one of the regmap tests takes 5 seconds to run since it waits
for a timeout. This should be handled using sandbox_timer_add_offset()
which advances time for test purposes.
This requires a little change to make the regmap_read_poll_timeout()
testable.
Update the macro and the test.
Fixes: ebe3497c9c ("test: regmap: add regmap_read_poll_timeout test")
Signed-off-by: Simon Glass <sjg@chromium.org>
351 lines
11 KiB
C
351 lines
11 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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* 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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/**
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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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enum regmap_endianness_t endianness;
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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 32-bit 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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* Note that this function will only write values of 32 bit width to the
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* regmap; if the size of data to be read is different, the regmap_raw_write
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* function can be used.
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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 32-bit 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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* Note that this function will only read values of 32 bit width from the
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* regmap; if the size of data to be read is different, the regmap_raw_read
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* function can be used.
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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 32-bit values, and is thus a
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* generalized version of 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 32-bit values, and is thus a
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* generalized version of 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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sandbox_timer_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_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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* 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_platdata() - 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_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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* 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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#endif
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