Merge branch 'i2c-for-2630-v2' of git://aeryn.fluff.org.uk/bjdooks/linux
[linux-2.6] / arch / powerpc / sysdev / dcr-low.S
1 /*
2  * "Indirect" DCR access
3  *
4  * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under  the terms of  the GNU General Public License as published by the
8  * Free Software Foundation;  either version 2 of the License, or (at your
9  * option) any later version.
10  */
11
12 #include <asm/ppc_asm.h>
13 #include <asm/processor.h>
14 #include <asm/bug.h>
15
16 #define DCR_ACCESS_PROLOG(table) \
17         cmpli   cr0,r3,1024;     \
18         rlwinm  r3,r3,4,18,27;   \
19         lis     r5,table@h;      \
20         ori     r5,r5,table@l;   \
21         add     r3,r3,r5;        \
22         bge-    1f;              \
23         mtctr   r3;              \
24         bctr;                    \
25 1:      trap;                    \
26         EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;  \
27         blr
28
29 _GLOBAL(__mfdcr)
30         DCR_ACCESS_PROLOG(__mfdcr_table)
31
32 _GLOBAL(__mtdcr)
33         DCR_ACCESS_PROLOG(__mtdcr_table)
34
35 __mfdcr_table:
36         mfdcr  r3,0; blr
37 __mtdcr_table:
38         mtdcr  0,r4; blr
39
40 dcr     = 1
41         .rept   1023
42         mfdcr   r3,dcr; blr
43         mtdcr   dcr,r4; blr
44         dcr     = dcr + 1
45         .endr