blob: c6a4c8f2d37b8b47b12a6c92dbb4e83c96598675 (
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
75
76
|
/* Load firmware into Core B on a BF561
*
* Copyright 2004-2009 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
/* The Core B reset func requires code in the application that is loaded into
* Core B. In order to reset, the application needs to install an interrupt
* handler for Supplemental Interrupt 0, that sets RETI to 0xff600000 and
* writes bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0. This causes Core
* B to stall when Supplemental Interrupt 0 is set, and will reset PC to
* 0xff600000 when COREB_SRAM_INIT is cleared.
*/
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#define CMD_COREB_START 2
#define CMD_COREB_STOP 3
#define CMD_COREB_RESET 4
static long
coreb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret = 0;
switch (cmd) {
case CMD_COREB_START:
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
break;
case CMD_COREB_STOP:
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
break;
case CMD_COREB_RESET:
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
break;
default:
ret = -EINVAL;
break;
}
CSYNC();
return ret;
}
static const struct file_operations coreb_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = coreb_ioctl,
.llseek = noop_llseek,
};
static struct miscdevice coreb_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "coreb",
.fops = &coreb_fops,
};
static int __init bf561_coreb_init(void)
{
return misc_register(&coreb_dev);
}
module_init(bf561_coreb_init);
static void __exit bf561_coreb_exit(void)
{
misc_deregister(&coreb_dev);
}
module_exit(bf561_coreb_exit);
MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
MODULE_DESCRIPTION("BF561 Core B Support");
|
