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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* iomem.c - linear register access CAN hardware abstraction layer
*
* Inspired by the OCAN driver http://ar.linux.it/software/#ocan
*
* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Send feedback to <socketcan-users@lists.berlios.de>
*
*/
#include <linux/netdevice.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include "hal.h"
/* init the HAL - call at driver module init */
int hal_init(void) { return 0; }
/* exit the HAL - call at driver module exit */
int hal_exit(void) { return 0; }
/* get name of this CAN HAL */
char *hal_name(void) { return "iomem"; }
/* fill arrays base[] and irq[] with HAL specific defaults */
void hal_use_defaults(void)
{
extern unsigned long base[];
extern unsigned int irq[];
base[0] = 0xd8000UL;
irq[0] = 5;
base[1] = 0xd8100UL;
irq[1] = 15;
}
/* request controller register access space */
int hal_request_region(int dev_num,
unsigned int num_regs,
char *drv_name)
{
extern unsigned long base[];
extern unsigned long rbase[];
/* creating the region for IOMEM is pretty easy */
if (!request_mem_region(base[dev_num], num_regs, drv_name))
return 0; /* failed */
/* set device base_addr */
rbase[dev_num] = (unsigned long)ioremap(base[dev_num], num_regs);
if (rbase[dev_num])
return 1; /* success */
/* cleanup due to failed ioremap() */
release_mem_region(base[dev_num], num_regs);
return 0; /* failed */
}
/* release controller register access space */
void hal_release_region(int dev_num,
unsigned int num_regs)
{
extern unsigned long base[];
extern unsigned long rbase[];
iounmap((void *)rbase[dev_num]);
release_mem_region(base[dev_num], num_regs);
}
/* enable non controller hardware (e.g. irq routing, etc.) */
int hw_attach(int dev_num) { return 0; }
/* disable non controller hardware (e.g. irq routing, etc.) */
int hw_detach(int dev_num) { return 0; }
/* reset controller hardware (with specific non controller hardware) */
int hw_reset_dev(int dev_num) { return 0; }
/* read from controller register */
u8 hw_readreg(unsigned long base, int reg) {
static u8 val;
void __iomem *addr = (void __iomem *)base + reg;
val = (u8)readb(addr);
rmb();
return val;
}
/* write to controller register */
void hw_writereg(unsigned long base, int reg, u8 val) {
void __iomem *addr = (void __iomem *)base + reg;
writeb(val, addr);
wmb();
}
/* hardware specific work to do at start of irq handler */
void hw_preirq(struct net_device *dev) { return; }
/* hardware specific work to do at end of irq handler */
void hw_postirq(struct net_device *dev) { return; }
|
