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) 2010 John Crispin <blogic@openwrt.org>
7 */
8
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/ioport.h>
12 #include <linux/pm.h>
13 #include <linux/export.h>
14 #include <asm/reboot.h>
15
16 #include <lantiq_soc.h>
17
18 #define ltq_rcu_w32(x, y) ltq_w32((x), ltq_rcu_membase + (y))
19 #define ltq_rcu_r32(x) ltq_r32(ltq_rcu_membase + (x))
20
21 /* register definitions */
22 #define LTQ_RCU_RST 0x0010
23 #define LTQ_RCU_RST_ALL 0x40000000
24
25 #define LTQ_RCU_RST_STAT 0x0014
26 #define LTQ_RCU_STAT_SHIFT 26
27
28 static struct resource ltq_rcu_resource = {
29 .name = "rcu",
30 .start = LTQ_RCU_BASE_ADDR,
31 .end = LTQ_RCU_BASE_ADDR + LTQ_RCU_SIZE - 1,
32 .flags = IORESOURCE_MEM,
33 };
34
35 /* remapped base addr of the reset control unit */
36 static void __iomem *ltq_rcu_membase;
37
38 /* This function is used by the watchdog driver */
ltq_reset_cause(void)39 int ltq_reset_cause(void)
40 {
41 u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
42 return val >> LTQ_RCU_STAT_SHIFT;
43 }
44 EXPORT_SYMBOL_GPL(ltq_reset_cause);
45
ltq_machine_restart(char * command)46 static void ltq_machine_restart(char *command)
47 {
48 pr_notice("System restart\n");
49 local_irq_disable();
50 ltq_rcu_w32(ltq_rcu_r32(LTQ_RCU_RST) | LTQ_RCU_RST_ALL, LTQ_RCU_RST);
51 unreachable();
52 }
53
ltq_machine_halt(void)54 static void ltq_machine_halt(void)
55 {
56 pr_notice("System halted.\n");
57 local_irq_disable();
58 unreachable();
59 }
60
ltq_machine_power_off(void)61 static void ltq_machine_power_off(void)
62 {
63 pr_notice("Please turn off the power now.\n");
64 local_irq_disable();
65 unreachable();
66 }
67
mips_reboot_setup(void)68 static int __init mips_reboot_setup(void)
69 {
70 /* insert and request the memory region */
71 if (insert_resource(&iomem_resource, <q_rcu_resource) < 0)
72 panic("Failed to insert rcu memory");
73
74 if (request_mem_region(ltq_rcu_resource.start,
75 resource_size(<q_rcu_resource), "rcu") < 0)
76 panic("Failed to request rcu memory");
77
78 /* remap rcu register range */
79 ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
80 resource_size(<q_rcu_resource));
81 if (!ltq_rcu_membase)
82 panic("Failed to remap rcu memory");
83
84 _machine_restart = ltq_machine_restart;
85 _machine_halt = ltq_machine_halt;
86 pm_power_off = ltq_machine_power_off;
87
88 return 0;
89 }
90
91 arch_initcall(mips_reboot_setup);
92