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authorMichael Hennerich <michael.hennerich@analog.com>2007-10-10 12:29:49 -0400
committerBryan Wu <bryan.wu@analog.com>2007-10-10 12:29:49 -0400
commit2714d9a6d1e68d30f5be8871722a7cff388c2d74 (patch)
treeccf786e468a2f3b79f10a862321c2f0e842bcab4 /arch/blackfin/kernel
parent4b3f058a7a34a10d99937e86bb28da118710ca9a (diff)
Blackfin arch: Workaround reboot bug, issue SSYNC at the start of bfin_reset
reboot failes on BF533 http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3500 Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r--arch/blackfin/kernel/reboot.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/reboot.c b/arch/blackfin/kernel/reboot.c
new file mode 100644
index 000000000000..356078ec462b
--- /dev/null
+++ b/arch/blackfin/kernel/reboot.c
@@ -0,0 +1,78 @@
1/*
2 * arch/blackfin/kernel/reboot.c - handle shutdown/reboot
3 *
4 * Copyright 2004-2007 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/interrupt.h>
10#include <asm/bfin-global.h>
11#include <asm/reboot.h>
12#include <asm/system.h>
13
14#if defined(BF537_FAMILY) || defined(BF533_FAMILY)
15#define SYSCR_VAL 0x0
16#elif defined(BF561_FAMILY)
17#define SYSCR_VAL 0x20
18#elif defined(BF548_FAMILY)
19#define SYSCR_VAL 0x10
20#endif
21
22/* A system soft reset makes external memory unusable
23 * so force this function into L1.
24 */
25__attribute__((l1_text))
26void bfin_reset(void)
27{
28 /* force BMODE and disable Core B (as needed) */
29 bfin_write_SYSCR(SYSCR_VAL);
30
31 /* we use asm ssync here because it's save and we save some L1 */
32 asm("ssync;");
33
34 while (1) {
35 /* initiate system soft reset with magic 0x7 */
36 bfin_write_SWRST(0x7);
37 asm("ssync;");
38 /* clear system soft reset */
39 bfin_write_SWRST(0);
40 asm("ssync;");
41 /* issue core reset */
42 asm("raise 1");
43 }
44}
45
46__attribute__((weak))
47void native_machine_restart(char *cmd)
48{
49}
50
51void machine_restart(char *cmd)
52{
53 native_machine_restart(cmd);
54 local_irq_disable();
55 bfin_reset();
56}
57
58__attribute__((weak))
59void native_machine_halt(void)
60{
61 idle_with_irq_disabled();
62}
63
64void machine_halt(void)
65{
66 native_machine_halt();
67}
68
69__attribute__((weak))
70void native_machine_power_off(void)
71{
72 idle_with_irq_disabled();
73}
74
75void machine_power_off(void)
76{
77 native_machine_power_off();
78}