xref: /OK3568_Linux_fs/u-boot/arch/mips/mach-pic32/reset.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun  * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
3*4882a593Smuzhiyun  *
4*4882a593Smuzhiyun  * SPDX-License-Identifier:	GPL-2.0+
5*4882a593Smuzhiyun  *
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <asm/io.h>
10*4882a593Smuzhiyun #include <mach/pic32.h>
11*4882a593Smuzhiyun 
12*4882a593Smuzhiyun /* SYSKEY */
13*4882a593Smuzhiyun #define UNLOCK_KEY1	0xaa996655
14*4882a593Smuzhiyun #define UNLOCK_KEY2	0x556699aa
15*4882a593Smuzhiyun #define LOCK_KEY	0
16*4882a593Smuzhiyun 
17*4882a593Smuzhiyun #define RSWRST          0x1250
18*4882a593Smuzhiyun 
_machine_restart(void)19*4882a593Smuzhiyun void _machine_restart(void)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun 	void __iomem *base;
22*4882a593Smuzhiyun 
23*4882a593Smuzhiyun 	base = pic32_get_syscfg_base();
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun 	/* unlock sequence */
26*4882a593Smuzhiyun 	writel(LOCK_KEY, base + SYSKEY);
27*4882a593Smuzhiyun 	writel(UNLOCK_KEY1, base + SYSKEY);
28*4882a593Smuzhiyun 	writel(UNLOCK_KEY2, base + SYSKEY);
29*4882a593Smuzhiyun 
30*4882a593Smuzhiyun 	/* soft reset */
31*4882a593Smuzhiyun 	writel(0x1, base + RSWRST);
32*4882a593Smuzhiyun 	(void) readl(base + RSWRST);
33*4882a593Smuzhiyun 
34*4882a593Smuzhiyun 	while (1)
35*4882a593Smuzhiyun 		;
36*4882a593Smuzhiyun }
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