Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / mips / lantiq / xway / reset.c
bloba1be36d0e490481b9fcdfdf6579e576ee115c111
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.
6 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
7 */
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/ioport.h>
12 #include <linux/pm.h>
13 #include <linux/module.h>
14 #include <asm/reboot.h>
16 #include <lantiq_soc.h>
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))
21 /* register definitions */
22 #define LTQ_RCU_RST 0x0010
23 #define LTQ_RCU_RST_ALL 0x40000000
25 #define LTQ_RCU_RST_STAT 0x0014
26 #define LTQ_RCU_STAT_SHIFT 26
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,
35 /* remapped base addr of the reset control unit */
36 static void __iomem *ltq_rcu_membase;
38 /* This function is used by the watchdog driver */
39 int ltq_reset_cause(void)
41 u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
42 return val >> LTQ_RCU_STAT_SHIFT;
44 EXPORT_SYMBOL_GPL(ltq_reset_cause);
46 static void ltq_machine_restart(char *command)
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();
54 static void ltq_machine_halt(void)
56 pr_notice("System halted.\n");
57 local_irq_disable();
58 unreachable();
61 static void ltq_machine_power_off(void)
63 pr_notice("Please turn off the power now.\n");
64 local_irq_disable();
65 unreachable();
68 static int __init mips_reboot_setup(void)
70 /* insert and request the memory region */
71 if (insert_resource(&iomem_resource, &ltq_rcu_resource) < 0)
72 panic("Failed to insert rcu memory\n");
74 if (request_mem_region(ltq_rcu_resource.start,
75 resource_size(&ltq_rcu_resource), "rcu") < 0)
76 panic("Failed to request rcu memory\n");
78 /* remap rcu register range */
79 ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
80 resource_size(&ltq_rcu_resource));
81 if (!ltq_rcu_membase)
82 panic("Failed to remap rcu memory\n");
84 _machine_restart = ltq_machine_restart;
85 _machine_halt = ltq_machine_halt;
86 pm_power_off = ltq_machine_power_off;
88 return 0;
91 arch_initcall(mips_reboot_setup);