42 lines
879 B
C
42 lines
879 B
C
/*
|
|
* Copyright 2021 Google LLC.
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#ifndef DRIVERS_SYSCON_SYSCON_COMMON_H_
|
|
#define DRIVERS_SYSCON_SYSCON_COMMON_H_
|
|
|
|
#include <sys/util.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Align and check register address
|
|
*
|
|
* @param reg Pointer to the register address in question.
|
|
* @param reg_size The size of the syscon register region.
|
|
* @param reg_width The width of a single register (in bytes).
|
|
* @return 0 if the register read is valid.
|
|
* @return -EINVAL is the read is invalid.
|
|
*/
|
|
static inline int syscon_sanitize_reg(uint16_t *reg, size_t reg_size, uint8_t reg_width)
|
|
{
|
|
/* Avoid unaligned readings */
|
|
*reg = ROUND_DOWN(*reg, reg_width);
|
|
|
|
/* Check for out-of-bounds readings */
|
|
if (*reg >= reg_size) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* DRIVERS_SYSCON_SYSCON_COMMON_H_ */
|