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/*
* The PCI Library -- Compiler-specific wrappers for memory mapped I/O
*
* Copyright (c) 2023 Pali Rohár <pali@kernel.org>
*
* Can be freely distributed and used under the terms of the GNU GPL v2+
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* FIXME
* Unfortunately gcc does not provide architecture independent way to read from
* or write to memory mapped I/O. The best approximation is to use volatile and
* for the write operation follow it by the read operation from the same address.
*/
static inline void
physmem_writeb(unsigned char value, volatile void *ptr)
{
*(volatile unsigned char *)ptr = value;
}
static inline void
physmem_writew(unsigned short value, volatile void *ptr)
{
*(volatile unsigned short *)ptr = value;
}
static inline void
physmem_writel(u32 value, volatile void *ptr)
{
*(volatile u32 *)ptr = value;
}
static inline unsigned char
physmem_readb(volatile void *ptr)
{
return *(volatile unsigned char *)ptr;
}
static inline unsigned short
physmem_readw(volatile void *ptr)
{
return *(volatile unsigned short *)ptr;
}
static inline u32
physmem_readl(volatile void *ptr)
{
return *(volatile u32 *)ptr;
}
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