a1f6d97978
1. Add support for multiple syscon entries (as a side effect, this also fixed syscon.c implementations which weren't being linked to their syscon.h counterparts). 2. Add support for different width registers in syscon. 3. Add tests for syscon Signed-off-by: Yuval Peress <peress@chromium.org>
42 lines
879 B
C
42 lines
879 B
C
/*
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* Copyright 2021 Google LLC.
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef DRIVERS_SYSCON_SYSCON_COMMON_H_
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#define DRIVERS_SYSCON_SYSCON_COMMON_H_
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#include <sys/util.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Align and check register address
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*
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* @param reg Pointer to the register address in question.
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* @param reg_size The size of the syscon register region.
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* @param reg_width The width of a single register (in bytes).
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* @return 0 if the register read is valid.
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* @return -EINVAL is the read is invalid.
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*/
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static inline int syscon_sanitize_reg(uint16_t *reg, size_t reg_size, uint8_t reg_width)
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{
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/* Avoid unaligned readings */
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*reg = ROUND_DOWN(*reg, reg_width);
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/* Check for out-of-bounds readings */
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if (*reg >= reg_size) {
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return -EINVAL;
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}
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* DRIVERS_SYSCON_SYSCON_COMMON_H_ */
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