Linux 2.6.25-rc4
[linux-2.6/next.git] / arch / blackfin / kernel / reboot.c
blob483f93dfc1b590a7ea6cdc582a40eadd3d17982e
1 /*
2 * arch/blackfin/kernel/reboot.c - handle shutdown/reboot
4 * Copyright 2004-2007 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
7 */
9 #include <linux/interrupt.h>
10 #include <asm/bfin-global.h>
11 #include <asm/reboot.h>
12 #include <asm/system.h>
14 #if defined(BF537_FAMILY) || defined(BF533_FAMILY) || defined(BF527_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
23 * Delay min 5 SCLK cycles using worst case CCLK/SCLK ratio (15)
25 #define SWRST_DELAY (5 * 15)
27 /* A system soft reset makes external memory unusable
28 * so force this function into L1.
30 __attribute__((l1_text))
31 void bfin_reset(void)
33 /* force BMODE and disable Core B (as needed) */
34 bfin_write_SYSCR(SYSCR_VAL);
36 /* we use asm ssync here because it's save and we save some L1 */
37 asm("ssync;");
39 while (1) {
40 /* initiate system soft reset with magic 0x7 */
41 bfin_write_SWRST(0x7);
43 /* Wait for System reset to actually reset, needs to be 5 SCLKs, */
44 /* Assume CCLK / SCLK ratio is worst case (15), and use 5*15 */
46 asm("LSETUP(.Lfoo,.Lfoo) LC0 = %0\n .Lfoo: NOP;\n"
47 : : "a" (SWRST_DELAY) : "LC0", "LT0", "LB0");
49 /* clear system soft reset */
50 bfin_write_SWRST(0);
51 asm("ssync;");
52 /* issue core reset */
53 asm("raise 1");
57 __attribute__((weak))
58 void native_machine_restart(char *cmd)
62 void machine_restart(char *cmd)
64 native_machine_restart(cmd);
65 local_irq_disable();
66 bfin_reset();
69 __attribute__((weak))
70 void native_machine_halt(void)
72 idle_with_irq_disabled();
75 void machine_halt(void)
77 native_machine_halt();
80 __attribute__((weak))
81 void native_machine_power_off(void)
83 idle_with_irq_disabled();
86 void machine_power_off(void)
88 native_machine_power_off();