2 * arch/blackfin/kernel/reboot.c - handle shutdown/reboot
4 * Copyright 2004-2007 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/interrupt.h>
10 #include <asm/bfin-global.h>
11 #include <asm/reboot.h>
12 #include <asm/system.h>
14 /* A system soft reset makes external memory unusable so force
15 * this function into L1. We use the compiler ssync here rather
16 * than SSYNC() because it's safe (no interrupts and such) and
17 * we save some L1. We do not need to force sanity in the SYSCR
18 * register as the BMODE selection bit is cleared by the soft
19 * reset while the Core B bit (on dual core parts) is cleared by
22 __attribute__((l1_text))
25 /* Wait for completion of "system" events such as cache line
26 * line fills so that we avoid infinite stalls later on as
27 * much as possible. This code is in L1, so it won't trigger
28 * any such event after this point in time.
30 __builtin_bfin_ssync();
33 /* Initiate System software reset. */
34 bfin_write_SWRST(0x7);
36 /* Due to the way reset is handled in the hardware, we need
37 * to delay for 10 SCLKS. The only reliable way to do this is
38 * to calculate the CCLK/SCLK ratio and multiply 10. For now,
39 * we'll assume worse case which is a 1:15 ratio.
42 "LSETUP (1f, 1f) LC0 = %0\n"
49 /* Clear System software reset */
52 /* Wait for the SWRST write to complete. Cannot rely on SSYNC
53 * though as the System state is all reset now.
56 "LSETUP (1f, 1f) LC1 = %0\n"
63 /* Issue core reset */
69 void native_machine_restart(char *cmd)
73 void machine_restart(char *cmd)
75 native_machine_restart(cmd);
81 void native_machine_halt(void)
83 idle_with_irq_disabled();
86 void machine_halt(void)
88 native_machine_halt();
92 void native_machine_power_off(void)
94 idle_with_irq_disabled();
97 void machine_power_off(void)
99 native_machine_power_off();