aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-powerpc/dcr-native.h
blob: 8dbb1ab0aa04d2fce6a0e4c858ee0357875e2cc1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/*
 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _ASM_POWERPC_DCR_NATIVE_H
#define _ASM_POWERPC_DCR_NATIVE_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__

typedef struct {
	unsigned int base;
} dcr_host_t;

#define DCR_MAP_OK(host)	(1)

#define dcr_map(dev, dcr_n, dcr_c)	((dcr_host_t){ .base = (dcr_n) })
#define dcr_unmap(host, dcr_c)		do {} while (0)
#define dcr_read(host, dcr_n)		mfdcr(dcr_n + host.base)
#define dcr_write(host, dcr_n, value)	mtdcr(dcr_n + host.base, value)

/* Device Control Registers */
void __mtdcr(int reg, unsigned int val);
unsigned int __mfdcr(int reg);
#define mfdcr(rn)						\
	({unsigned int rval;					\
	if (__builtin_constant_p(rn))				\
		asm volatile("mfdcr %0," __stringify(rn)	\
		              : "=r" (rval));			\
	else							\
		rval = __mfdcr(rn);				\
	rval;})

#define mtdcr(rn, v)						\
do {								\
	if (__builtin_constant_p(rn))				\
		asm volatile("mtdcr " __stringify(rn) ",%0"	\
			      : : "r" (v)); 			\
	else							\
		__mtdcr(rn, v);					\
} while (0)

/* R/W of indirect DCRs make use of standard naming conventions for DCRs */
#define mfdcri(base, reg)			\
({						\
	mtdcr(base ## _CFGADDR, base ## _ ## reg);	\
	mfdcr(base ## _CFGDATA);			\
})

#define mtdcri(base, reg, data)			\
do {						\
	mtdcr(base ## _CFGADDR, base ## _ ## reg);	\
	mtdcr(base ## _CFGDATA, data);		\
} while (0)

#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DCR_NATIVE_H */