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1da177e4 LT |
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> | |
fcdb27ad | 18 | #include <linux/pm.h> |
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19 | |
20 | #include <asm/addrspace.h> | |
21 | #include <asm/irq.h> | |
22 | #include <asm/reboot.h> | |
23 | #include <asm/system.h> | |
24 | #include <asm/wbflush.h> | |
25 | #include <asm/ip32/mace.h> | |
26 | #include <asm/ip32/crime.h> | |
27 | #include <asm/ip32/ip32_ints.h> | |
28 | ||
29 | #define POWERDOWN_TIMEOUT 120 | |
30 | /* | |
f18190bd | 31 | * Blink frequency during reboot grace period and when panicked. |
1da177e4 LT |
32 | */ |
33 | #define POWERDOWN_FREQ (HZ / 4) | |
34 | #define PANIC_FREQ (HZ / 8) | |
35 | ||
36 | static struct timer_list power_timer, blink_timer, debounce_timer; | |
f18190bd | 37 | static int has_panicked, shuting_down; |
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38 | |
39 | static void ip32_machine_restart(char *command) __attribute__((noreturn)); | |
40 | static void ip32_machine_halt(void) __attribute__((noreturn)); | |
41 | static void ip32_machine_power_off(void) __attribute__((noreturn)); | |
42 | ||
43 | static void ip32_machine_restart(char *cmd) | |
44 | { | |
45 | crime->control = CRIME_CONTROL_HARD_RESET; | |
46 | while (1); | |
47 | } | |
48 | ||
49 | static inline void ip32_machine_halt(void) | |
50 | { | |
51 | ip32_machine_power_off(); | |
52 | } | |
53 | ||
54 | static void ip32_machine_power_off(void) | |
55 | { | |
56 | volatile unsigned char reg_a, xctrl_a, xctrl_b; | |
57 | ||
58 | disable_irq(MACEISA_RTC_IRQ); | |
59 | reg_a = CMOS_READ(RTC_REG_A); | |
60 | ||
61 | /* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */ | |
62 | reg_a &= ~DS_REGA_DV2; | |
63 | reg_a |= DS_REGA_DV1; | |
64 | ||
65 | CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); | |
66 | wbflush(); | |
67 | xctrl_b = CMOS_READ(DS_B1_XCTRL4B) | |
68 | | DS_XCTRL4B_ABE | DS_XCTRL4B_KFE; | |
69 | CMOS_WRITE(xctrl_b, DS_B1_XCTRL4B); | |
70 | xctrl_a = CMOS_READ(DS_B1_XCTRL4A) & ~DS_XCTRL4A_IFS; | |
71 | CMOS_WRITE(xctrl_a, DS_B1_XCTRL4A); | |
72 | wbflush(); | |
73 | /* adios amigos... */ | |
74 | CMOS_WRITE(xctrl_a | DS_XCTRL4A_PAB, DS_B1_XCTRL4A); | |
75 | CMOS_WRITE(reg_a, RTC_REG_A); | |
76 | wbflush(); | |
77 | while (1); | |
78 | } | |
79 | ||
80 | static void power_timeout(unsigned long data) | |
81 | { | |
82 | ip32_machine_power_off(); | |
83 | } | |
84 | ||
85 | static void blink_timeout(unsigned long data) | |
86 | { | |
87 | unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED; | |
88 | mace->perif.ctrl.misc = led; | |
89 | mod_timer(&blink_timer, jiffies + data); | |
90 | } | |
91 | ||
92 | static void debounce(unsigned long data) | |
93 | { | |
94 | volatile unsigned char reg_a, reg_c, xctrl_a; | |
95 | ||
96 | reg_c = CMOS_READ(RTC_INTR_FLAGS); | |
63c901c7 | 97 | reg_a = CMOS_READ(RTC_REG_A); |
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98 | CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); |
99 | wbflush(); | |
100 | xctrl_a = CMOS_READ(DS_B1_XCTRL4A); | |
101 | if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) { | |
102 | /* Interrupt still being sent. */ | |
103 | debounce_timer.expires = jiffies + 50; | |
104 | add_timer(&debounce_timer); | |
105 | ||
106 | /* clear interrupt source */ | |
107 | CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A); | |
108 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); | |
109 | return; | |
110 | } | |
111 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); | |
112 | ||
f18190bd | 113 | if (has_panicked) |
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114 | ip32_machine_restart(NULL); |
115 | ||
116 | enable_irq(MACEISA_RTC_IRQ); | |
117 | } | |
118 | ||
119 | static inline void ip32_power_button(void) | |
120 | { | |
f18190bd | 121 | if (has_panicked) |
1da177e4 LT |
122 | return; |
123 | ||
9ec52099 | 124 | if (shuting_down || kill_cad_pid(SIGINT, 1)) { |
1da177e4 LT |
125 | /* No init process or button pressed twice. */ |
126 | ip32_machine_power_off(); | |
127 | } | |
128 | ||
129 | shuting_down = 1; | |
130 | blink_timer.data = POWERDOWN_FREQ; | |
131 | blink_timeout(POWERDOWN_FREQ); | |
132 | ||
133 | init_timer(&power_timer); | |
134 | power_timer.function = power_timeout; | |
135 | power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; | |
136 | add_timer(&power_timer); | |
137 | } | |
138 | ||
36d98e79 | 139 | static irqreturn_t ip32_rtc_int(int irq, void *dev_id) |
1da177e4 LT |
140 | { |
141 | volatile unsigned char reg_c; | |
142 | ||
143 | reg_c = CMOS_READ(RTC_INTR_FLAGS); | |
144 | if (!(reg_c & RTC_IRQF)) { | |
42a3b4f2 | 145 | printk(KERN_WARNING |
bb09a954 | 146 | "%s: RTC IRQ without RTC_IRQF\n", __func__); |
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147 | } |
148 | /* Wait until interrupt goes away */ | |
950312ce | 149 | disable_irq_nosync(MACEISA_RTC_IRQ); |
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150 | init_timer(&debounce_timer); |
151 | debounce_timer.function = debounce; | |
152 | debounce_timer.expires = jiffies + 50; | |
153 | add_timer(&debounce_timer); | |
154 | ||
155 | printk(KERN_DEBUG "Power button pressed\n"); | |
156 | ip32_power_button(); | |
157 | return IRQ_HANDLED; | |
158 | } | |
159 | ||
160 | static int panic_event(struct notifier_block *this, unsigned long event, | |
161 | void *ptr) | |
162 | { | |
163 | unsigned long led; | |
164 | ||
f18190bd | 165 | if (has_panicked) |
1da177e4 | 166 | return NOTIFY_DONE; |
f18190bd | 167 | has_panicked = 1; |
1da177e4 LT |
168 | |
169 | /* turn off the green LED */ | |
170 | led = mace->perif.ctrl.misc | MACEISA_LED_GREEN; | |
171 | mace->perif.ctrl.misc = led; | |
172 | ||
173 | blink_timer.data = PANIC_FREQ; | |
174 | blink_timeout(PANIC_FREQ); | |
175 | ||
176 | return NOTIFY_DONE; | |
177 | } | |
178 | ||
179 | static struct notifier_block panic_block = { | |
180 | .notifier_call = panic_event, | |
181 | }; | |
182 | ||
183 | static __init int ip32_reboot_setup(void) | |
184 | { | |
185 | /* turn on the green led only */ | |
186 | unsigned long led = mace->perif.ctrl.misc; | |
187 | led |= MACEISA_LED_RED; | |
188 | led &= ~MACEISA_LED_GREEN; | |
189 | mace->perif.ctrl.misc = led; | |
190 | ||
191 | _machine_restart = ip32_machine_restart; | |
192 | _machine_halt = ip32_machine_halt; | |
fcdb27ad | 193 | pm_power_off = ip32_machine_power_off; |
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194 | |
195 | init_timer(&blink_timer); | |
196 | blink_timer.function = blink_timeout; | |
e041c683 | 197 | atomic_notifier_chain_register(&panic_notifier_list, &panic_block); |
1da177e4 | 198 | |
c3dd8cdf RB |
199 | if (request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL)) |
200 | panic("Can't allocate MACEISA RTC IRQ"); | |
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201 | |
202 | return 0; | |
203 | } | |
204 | ||
205 | subsys_initcall(ip32_reboot_setup); |