1 /*
2 * reset.c -- common ColdFire SoC reset support
3 *
4 * (C) Copyright 2012, Greg Ungerer <gerg@uclinux.org>
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/io.h>
14 #include <asm/machdep.h>
15 #include <asm/coldfire.h>
16 #include <asm/mcfsim.h>
17
18 /*
19 * There are 2 common methods amongst the ColdFure parts for reseting
20 * the CPU. But there are couple of exceptions, the 5272 and the 547x
21 * have something completely special to them, and we let their specific
22 * subarch code handle them.
23 */
24
25 #ifdef MCFSIM_SYPCR
26 static void mcf_cpu_reset(void)
27 {
28 local_irq_disable();
29 /* Set watchdog to soft reset, and enabled */
30 __raw_writeb(0xc0, MCFSIM_SYPCR);
31 for (;;)
32 /* wait for watchdog to timeout */;
33 }
34 #endif
35
36 #ifdef MCF_RCR
37 static void mcf_cpu_reset(void)
38 {
39 local_irq_disable();
40 __raw_writeb(MCF_RCR_SWRESET, MCF_RCR);
41 }
42 #endif
43
44 static int __init mcf_setup_reset(void)
45 {
46 mach_reset = mcf_cpu_reset;
47 return 0;
48 }
49
50 arch_initcall(mcf_setup_reset);
51
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