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/*
* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @brief RISCV32 memory mapped register I/O operations
*/
#ifndef _RISCV32_SYS_IO_H_
#define _RISCV32_SYS_IO_H_
#if !defined(_ASMLANGUAGE)
#include <sys_io.h>
/* Memory mapped registers I/O functions */
static inline u32_t sys_read32(mem_addr_t addr)
{
return *(volatile u32_t *)addr;
}
static inline void sys_write32(u32_t data, mem_addr_t addr)
{
*(volatile u32_t *)addr = data;
}
static inline u8_t sys_read8(mem_addr_t addr)
{
return *(volatile u8_t *)addr;
}
static inline void sys_write8(u8_t data, mem_addr_t addr)
{
*(volatile u8_t *)addr = data;
}
/* Memory bit manipulation functions */
static inline void sys_set_bit(mem_addr_t addr, unsigned int bit)
{
u32_t temp = *(volatile u32_t *)addr;
*(volatile u32_t *)addr = temp | (1 << bit);
}
static inline void sys_clear_bit(mem_addr_t addr, unsigned int bit)
{
u32_t temp = *(volatile u32_t *)addr;
*(volatile u32_t *)addr = temp & ~(1 << bit);
}
static ALWAYS_INLINE
int sys_test_bit(mem_addr_t addr, unsigned int bit)
{
u32_t temp = *(volatile u32_t *)addr;
return temp & (1 << bit);
}
static ALWAYS_INLINE
int sys_test_and_set_bit(mem_addr_t addr, unsigned int bit)
{
int ret;
ret = sys_test_bit(addr, bit);
sys_set_bit(addr, bit);
return ret;
}
static ALWAYS_INLINE
int sys_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
{
int ret;
ret = sys_test_bit(addr, bit);
sys_clear_bit(addr, bit);
return ret;
}
static ALWAYS_INLINE
void sys_bitfield_set_bit(mem_addr_t addr, unsigned int bit)
{
/* Doing memory offsets in terms of 32-bit values to prevent
* alignment issues
*/
sys_set_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
static ALWAYS_INLINE
void sys_bitfield_clear_bit(mem_addr_t addr, unsigned int bit)
{
sys_clear_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
static ALWAYS_INLINE
int sys_bitfield_test_bit(mem_addr_t addr, unsigned int bit)
{
return sys_test_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
static ALWAYS_INLINE
int sys_bitfield_test_and_set_bit(mem_addr_t addr, unsigned int bit)
{
int ret;
ret = sys_bitfield_test_bit(addr, bit);
sys_bitfield_set_bit(addr, bit);
return ret;
}
static ALWAYS_INLINE
int sys_bitfield_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
{
int ret;
ret = sys_bitfield_test_bit(addr, bit);
sys_bitfield_clear_bit(addr, bit);
return ret;
}
#endif /* !_ASMLANGUAGE */
#endif /* _RISCV32_SYS_IO_H_ */