Linux Kernel  3.7.1
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reset.c
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1 /*
2  * This program is free software; you can redistribute it and/or modify it
3  * under the terms of the GNU General Public License version 2 as published
4  * by the Free Software Foundation.
5  *
6  * Copyright (C) 2012 Thomas Langer <[email protected]>
7  * Copyright (C) 2012 John Crispin <[email protected]>
8  */
9 
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/pm.h>
13 #include <asm/reboot.h>
14 #include <linux/export.h>
15 
16 #include <lantiq_soc.h>
17 
18 /* CPU0 Reset Source Register */
19 #define SYS1_CPU0RS 0x0040
20 /* reset cause mask */
21 #define CPU0RS_MASK 0x0003
22 /* CPU0 Boot Mode Register */
23 #define SYS1_BM 0x00a0
24 /* boot mode mask */
25 #define BM_MASK 0x0005
26 
27 /* allow platform code to find out what surce we booted from */
28 unsigned char ltq_boot_select(void)
29 {
30  return ltq_sys1_r32(SYS1_BM) & BM_MASK;
31 }
32 
33 /* allow the watchdog driver to find out what the boot reason was */
34 int ltq_reset_cause(void)
35 {
36  return ltq_sys1_r32(SYS1_CPU0RS) & CPU0RS_MASK;
37 }
39 
40 #define BOOT_REG_BASE (KSEG1 | 0x1F200000)
41 #define BOOT_PW1_REG (BOOT_REG_BASE | 0x20)
42 #define BOOT_PW2_REG (BOOT_REG_BASE | 0x24)
43 #define BOOT_PW1 0x4C545100
44 #define BOOT_PW2 0x0051544C
45 
46 #define WDT_REG_BASE (KSEG1 | 0x1F8803F0)
47 #define WDT_PW1 0x00BE0000
48 #define WDT_PW2 0x00DC0000
49 
50 static void machine_restart(char *command)
51 {
53 
54  /* reboot magic */
55  ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */
56  ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */
57  ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */
58 
59  /* watchdog magic */
60  ltq_w32(WDT_PW1, (void *)WDT_REG_BASE);
62  (0x3 << 26) | /* PWL */
63  (0x2 << 24) | /* CLKDIV */
64  (0x1 << 31) | /* enable */
65  (1), /* reload */
66  (void *)WDT_REG_BASE);
67  unreachable();
68 }
69 
70 static void machine_halt(void)
71 {
73  unreachable();
74 }
75 
76 static void machine_power_off(void)
77 {
79  unreachable();
80 }
81 
82 static int __init mips_reboot_setup(void)
83 {
87  return 0;
88 }
89 
90 arch_initcall(mips_reboot_setup);