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1 | /* Load firmware into Core B on a BF561 |
2 | * |
3 | * Copyright 2004-2009 Analog Devices Inc. |
4 | * Licensed under the GPL-2 or later. |
5 | */ |
6 | |
7 | /* The Core B reset func requires code in the application that is loaded into |
8 | * Core B. In order to reset, the application needs to install an interrupt |
9 | * handler for Supplemental Interrupt 0, that sets RETI to 0xff600000 and |
10 | * writes bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0. This causes Core |
11 | * B to stall when Supplemental Interrupt 0 is set, and will reset PC to |
12 | * 0xff600000 when COREB_SRAM_INIT is cleared. |
13 | */ |
14 | |
15 | #include <linux/device.h> |
16 | #include <linux/fs.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/miscdevice.h> |
19 | #include <linux/module.h> |
20 | |
21 | #define CMD_COREB_START _IO('b', 0) |
22 | #define CMD_COREB_STOP _IO('b', 1) |
23 | #define CMD_COREB_RESET _IO('b', 2) |
24 | |
25 | static long |
26 | coreb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
27 | { |
28 | int ret = 0; |
29 | |
30 | switch (cmd) { |
31 | case CMD_COREB_START: |
32 | bfin_write_SYSCR(bfin_read_SYSCR() & ~0x0020); |
33 | break; |
34 | case CMD_COREB_STOP: |
35 | bfin_write_SYSCR(bfin_read_SYSCR() | 0x0020); |
36 | bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080); |
37 | break; |
38 | case CMD_COREB_RESET: |
39 | bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080); |
40 | break; |
41 | default: |
42 | ret = -EINVAL; |
43 | break; |
44 | } |
45 | |
46 | CSYNC(); |
47 | |
48 | return ret; |
49 | } |
50 | |
51 | static const struct file_operations coreb_fops = { |
52 | .owner = THIS_MODULE, |
53 | .unlocked_ioctl = coreb_ioctl, |
54 | .llseek = noop_llseek, |
55 | }; |
56 | |
57 | static struct miscdevice coreb_dev = { |
58 | .minor = MISC_DYNAMIC_MINOR, |
59 | .name = "coreb", |
60 | .fops = &coreb_fops, |
61 | }; |
62 | |
63 | static int __init bf561_coreb_init(void) |
64 | { |
65 | return misc_register(&coreb_dev); |
66 | } |
67 | module_init(bf561_coreb_init); |
68 | |
69 | static void __exit bf561_coreb_exit(void) |
70 | { |
71 | misc_deregister(&coreb_dev); |
72 | } |
73 | module_exit(bf561_coreb_exit); |
74 | |
75 | MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>"); |
76 | MODULE_DESCRIPTION("BF561 Core B Support"); |
77 | MODULE_LICENSE("GPL"); |
78 |
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