xref: /linux/arch/mips/pic32/common/reset.c (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Joshua Henderson <joshua.henderson@microchip.com>
4  * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
5  */
6 #include <linux/init.h>
7 #include <linux/pm.h>
8 #include <asm/reboot.h>
9 #include <asm/mach-pic32/pic32.h>
10 
11 #define PIC32_RSWRST		0x10
12 
pic32_halt(void)13 static void pic32_halt(void)
14 {
15 	while (1) {
16 		__asm__(".set push;\n"
17 			".set arch=r4000;\n"
18 			"wait;\n"
19 			".set pop;\n"
20 		);
21 	}
22 }
23 
pic32_machine_restart(char * command)24 static void pic32_machine_restart(char *command)
25 {
26 	void __iomem *reg =
27 		ioremap(PIC32_BASE_RESET + PIC32_RSWRST, sizeof(u32));
28 
29 	pic32_syskey_unlock();
30 
31 	/* magic write/read */
32 	__raw_writel(1, reg);
33 	(void)__raw_readl(reg);
34 
35 	pic32_halt();
36 }
37 
pic32_machine_halt(void)38 static void pic32_machine_halt(void)
39 {
40 	local_irq_disable();
41 
42 	pic32_halt();
43 }
44 
mips_reboot_setup(void)45 static int __init mips_reboot_setup(void)
46 {
47 	_machine_restart = pic32_machine_restart;
48 	_machine_halt = pic32_machine_halt;
49 	pm_power_off = pic32_machine_halt;
50 
51 	return 0;
52 }
53 
54 arch_initcall(mips_reboot_setup);
55