1 /*
2 * (C) Copyright IBM Corporation 2004
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file mmio.h
27 * Functions for properly handling memory mapped IO on various platforms.
28 *
29 * \author Ian Romanick <idr@us.ibm.com>
30 */
31
32
33 #ifndef MMIO_H
34 #define MMIO_H
35
36 #include "main/glheader.h"
37
38 #if defined( __powerpc__ )
39
40 static INLINE uint32_t
read_MMIO_LE32(volatile void * base,unsigned long offset)41 read_MMIO_LE32( volatile void * base, unsigned long offset )
42 {
43 uint32_t val;
44
45 __asm__ __volatile__( "lwbrx %0, %1, %2 ; eieio"
46 : "=r" (val)
47 : "b" (base), "r" (offset) );
48 return val;
49 }
50
51 #else
52
53 static INLINE uint32_t
read_MMIO_LE32(volatile void * base,unsigned long offset)54 read_MMIO_LE32( volatile void * base, unsigned long offset )
55 {
56 volatile uint32_t * p = (volatile uint32_t *) (((volatile char *) base) + offset);
57 return LE32_TO_CPU( p[0] );
58 }
59
60 #endif
61
62 #endif /* MMIO_H */
63