diff options
Diffstat (limited to 'include/asm-mips/io.h')
| -rw-r--r-- | include/asm-mips/io.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h index 20bdbeb34..d4c77dd78 100644 --- a/include/asm-mips/io.h +++ b/include/asm-mips/io.h @@ -1,4 +1,4 @@ -/* $Id$ +/* $Id: io.h,v 1.7 1999/10/09 00:01:43 ralf Exp $ * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive @@ -174,6 +174,23 @@ extern inline void iounmap(void *addr) /* END SNI HACKS ... */ /* + * ISA space is 'always mapped' on currently supported MIPS systems, no need + * to explicitly ioremap() it. The fact that the ISA IO space is mapped + * to PAGE_OFFSET is pure coincidence - it does not mean ISA values + * are physical addresses. The following constant pointer can be + * used as the IO-area pointer (it can be iounmapped as well, so the + * analogy with PCI is quite large): + */ +#define __ISA_IO_base ((char *)(PAGE_OFFSET)) + +#define isa_readb(a) readb(a) +#define isa_readw(a) readb(a) +#define isa_readl(a) readb(a) +#define isa_writeb(b,a) writeb(b,a) +#define isa_writew(w,a) writeb(w,a) +#define isa_writel(l,a) writeb(l,a) + +/* * We don't have csum_partial_copy_fromio() yet, so we cheat here and * just copy it. The net code will then do the checksum later. */ |