include/asm/io.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
6  * Copyright (C) 1996-2000 Russell King
21  * when using {read,write}* fns in low-level headers
29 #define IO_SPACE_LIMIT		(PCI_IO_SIZE - 1)
34  * Emulation routines for the port-mapped IO space used by some PCI drivers.
38  *  - Fully ordered WRT each other, by bracketing them with two fences.  The
41  *  - Ordered in the same manner as readX/writeX WRT memory by subsuming their
43  *  - Ordered WRT timer reads, so udelay and friends don't get elided by the
45  * Note that there is no way to actually enforce that outX is a non-posted
46  * operation on RISC-V, but hopefully the timer ordering constraint is
59  * perform host-endian accesses so we use __raw instead of __cpu.
73 			} while (--count);					\
89 			} while (--count);					\
136 #include <asm-generic/io.h>