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mmio: add 16-bit variants of read/write/set

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Change-Id: If4fb5585865768daa151bd4aa343ac5c84d2e9c3
This commit is contained in:
Thomas Cort 2013-08-12 13:33:13 -04:00
parent 70bd6044c8
commit 99e91dab2f
1 changed files with 29 additions and 0 deletions
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29
include/minix/mmio.h
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@ -1,6 +1,7 @@
#ifndef __MMIO_H__
#define __MMIO_H__
#define REG16(x)(*((volatile uint16_t *)(x)))
#define REG(x)(*((volatile uint32_t *)(x)))
#define BIT(x)(0x1 << x)
@ -30,4 +31,32 @@ set32(uint32_t address, uint32_t mask, uint32_t value)
val |= (value & mask);
write32(address, val);
}
/* Write a uint16_t value to a memory address. */
static inline void
write16(uint32_t address, uint16_t value)
{
REG16(address) = value;
}
/* Read an uint16_t from a memory address */
static inline uint16_t
read16(uint32_t address)
{
return REG16(address);
}
/* Set a 16 bits value depending on a mask */
static inline void
set16(uint32_t address, uint16_t mask, uint16_t value)
{
uint16_t val;
val = read16(address);
/* clear the bits */
val &= ~(mask);
/* apply the value using the mask */
val |= (value & mask);
write16(address, val);
}
#endif /* __MMIO_H__ */