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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/sgi-ip32/ip32-reset.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/mips/sgi-ip32/ip32-reset.c')
-rw-r--r--arch/mips/sgi-ip32/ip32-reset.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c
new file mode 100644
index 000000000000..281f090e48a4
--- /dev/null
+++ b/arch/mips/sgi-ip32/ip32-reset.c
@@ -0,0 +1,202 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2001 Keith M Wesolowski
7 * Copyright (C) 2001 Paul Mundt
8 * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
9 */
10
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/notifier.h>
15#include <linux/delay.h>
16#include <linux/ds17287rtc.h>
17#include <linux/interrupt.h>
18
19#include <asm/addrspace.h>
20#include <asm/irq.h>
21#include <asm/reboot.h>
22#include <asm/system.h>
23#include <asm/wbflush.h>
24#include <asm/ip32/mace.h>
25#include <asm/ip32/crime.h>
26#include <asm/ip32/ip32_ints.h>
27
28#define POWERDOWN_TIMEOUT 120
29/*
30 * Blink frequency during reboot grace period and when paniced.
31 */
32#define POWERDOWN_FREQ (HZ / 4)
33#define PANIC_FREQ (HZ / 8)
34
35static struct timer_list power_timer, blink_timer, debounce_timer;
36static int has_paniced, shuting_down;
37
38static void ip32_machine_restart(char *command) __attribute__((noreturn));
39static void ip32_machine_halt(void) __attribute__((noreturn));
40static void ip32_machine_power_off(void) __attribute__((noreturn));
41
42static void ip32_machine_restart(char *cmd)
43{
44 crime->control = CRIME_CONTROL_HARD_RESET;
45 while (1);
46}
47
48static inline void ip32_machine_halt(void)
49{
50 ip32_machine_power_off();
51}
52
53static void ip32_machine_power_off(void)
54{
55 volatile unsigned char reg_a, xctrl_a, xctrl_b;
56
57 disable_irq(MACEISA_RTC_IRQ);
58 reg_a = CMOS_READ(RTC_REG_A);
59
60 /* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */
61 reg_a &= ~DS_REGA_DV2;
62 reg_a |= DS_REGA_DV1;
63
64 CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A);
65 wbflush();
66 xctrl_b = CMOS_READ(DS_B1_XCTRL4B)
67 | DS_XCTRL4B_ABE | DS_XCTRL4B_KFE;
68 CMOS_WRITE(xctrl_b, DS_B1_XCTRL4B);
69 xctrl_a = CMOS_READ(DS_B1_XCTRL4A) & ~DS_XCTRL4A_IFS;
70 CMOS_WRITE(xctrl_a, DS_B1_XCTRL4A);
71 wbflush();
72 /* adios amigos... */
73 CMOS_WRITE(xctrl_a | DS_XCTRL4A_PAB, DS_B1_XCTRL4A);
74 CMOS_WRITE(reg_a, RTC_REG_A);
75 wbflush();
76 while (1);
77}
78
79static void power_timeout(unsigned long data)
80{
81 ip32_machine_power_off();
82}
83
84static void blink_timeout(unsigned long data)
85{
86 unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
87 mace->perif.ctrl.misc = led;
88 mod_timer(&blink_timer, jiffies + data);
89}
90
91static void debounce(unsigned long data)
92{
93 volatile unsigned char reg_a, reg_c, xctrl_a;
94
95 reg_c = CMOS_READ(RTC_INTR_FLAGS);
96 CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A);
97 wbflush();
98 xctrl_a = CMOS_READ(DS_B1_XCTRL4A);
99 if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) {
100 /* Interrupt still being sent. */
101 debounce_timer.expires = jiffies + 50;
102 add_timer(&debounce_timer);
103
104 /* clear interrupt source */
105 CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A);
106 CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A);
107 return;
108 }
109 CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A);
110
111 if (has_paniced)
112 ip32_machine_restart(NULL);
113
114 enable_irq(MACEISA_RTC_IRQ);
115}
116
117static inline void ip32_power_button(void)
118{
119 if (has_paniced)
120 return;
121
122 if (shuting_down || kill_proc(1, SIGINT, 1)) {
123 /* No init process or button pressed twice. */
124 ip32_machine_power_off();
125 }
126
127 shuting_down = 1;
128 blink_timer.data = POWERDOWN_FREQ;
129 blink_timeout(POWERDOWN_FREQ);
130
131 init_timer(&power_timer);
132 power_timer.function = power_timeout;
133 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
134 add_timer(&power_timer);
135}
136
137static irqreturn_t ip32_rtc_int(int irq, void *dev_id, struct pt_regs *regs)
138{
139 volatile unsigned char reg_c;
140
141 reg_c = CMOS_READ(RTC_INTR_FLAGS);
142 if (!(reg_c & RTC_IRQF)) {
143 printk(KERN_WARNING
144 "%s: RTC IRQ without RTC_IRQF\n", __FUNCTION__);
145 }
146 /* Wait until interrupt goes away */
147 disable_irq(MACEISA_RTC_IRQ);
148 init_timer(&debounce_timer);
149 debounce_timer.function = debounce;
150 debounce_timer.expires = jiffies + 50;
151 add_timer(&debounce_timer);
152
153 printk(KERN_DEBUG "Power button pressed\n");
154 ip32_power_button();
155 return IRQ_HANDLED;
156}
157
158static int panic_event(struct notifier_block *this, unsigned long event,
159 void *ptr)
160{
161 unsigned long led;
162
163 if (has_paniced)
164 return NOTIFY_DONE;
165 has_paniced = 1;
166
167 /* turn off the green LED */
168 led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
169 mace->perif.ctrl.misc = led;
170
171 blink_timer.data = PANIC_FREQ;
172 blink_timeout(PANIC_FREQ);
173
174 return NOTIFY_DONE;
175}
176
177static struct notifier_block panic_block = {
178 .notifier_call = panic_event,
179};
180
181static __init int ip32_reboot_setup(void)
182{
183 /* turn on the green led only */
184 unsigned long led = mace->perif.ctrl.misc;
185 led |= MACEISA_LED_RED;
186 led &= ~MACEISA_LED_GREEN;
187 mace->perif.ctrl.misc = led;
188
189 _machine_restart = ip32_machine_restart;
190 _machine_halt = ip32_machine_halt;
191 _machine_power_off = ip32_machine_power_off;
192
193 init_timer(&blink_timer);
194 blink_timer.function = blink_timeout;
195 notifier_chain_register(&panic_notifier_list, &panic_block);
196
197 request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL);
198
199 return 0;
200}
201
202subsys_initcall(ip32_reboot_setup);