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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> | |
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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 | /* | |
f18190bd | 30 | * Blink frequency during reboot grace period and when panicked. |
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31 | */ |
32 | #define POWERDOWN_FREQ (HZ / 4) | |
33 | #define PANIC_FREQ (HZ / 8) | |
34 | ||
35 | static struct timer_list power_timer, blink_timer, debounce_timer; | |
f18190bd | 36 | static int has_panicked, shuting_down; |
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37 | |
38 | static void ip32_machine_restart(char *command) __attribute__((noreturn)); | |
39 | static void ip32_machine_halt(void) __attribute__((noreturn)); | |
40 | static void ip32_machine_power_off(void) __attribute__((noreturn)); | |
41 | ||
42 | static void ip32_machine_restart(char *cmd) | |
43 | { | |
44 | crime->control = CRIME_CONTROL_HARD_RESET; | |
45 | while (1); | |
46 | } | |
47 | ||
48 | static inline void ip32_machine_halt(void) | |
49 | { | |
50 | ip32_machine_power_off(); | |
51 | } | |
52 | ||
53 | static void ip32_machine_power_off(void) | |
54 | { | |
d2f82c2f | 55 | unsigned char reg_a, xctrl_a, xctrl_b; |
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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 | ||
79 | static void power_timeout(unsigned long data) | |
80 | { | |
81 | ip32_machine_power_off(); | |
82 | } | |
83 | ||
84 | static 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 | ||
91 | static void debounce(unsigned long data) | |
92 | { | |
d2f82c2f | 93 | unsigned char reg_a, reg_c, xctrl_a; |
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94 | |
95 | reg_c = CMOS_READ(RTC_INTR_FLAGS); | |
63c901c7 | 96 | reg_a = CMOS_READ(RTC_REG_A); |
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97 | CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); |
98 | wbflush(); | |
99 | xctrl_a = CMOS_READ(DS_B1_XCTRL4A); | |
100 | if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) { | |
101 | /* Interrupt still being sent. */ | |
102 | debounce_timer.expires = jiffies + 50; | |
103 | add_timer(&debounce_timer); | |
104 | ||
105 | /* clear interrupt source */ | |
106 | CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A); | |
107 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); | |
108 | return; | |
109 | } | |
110 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); | |
111 | ||
f18190bd | 112 | if (has_panicked) |
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113 | ip32_machine_restart(NULL); |
114 | ||
115 | enable_irq(MACEISA_RTC_IRQ); | |
116 | } | |
117 | ||
118 | static inline void ip32_power_button(void) | |
119 | { | |
f18190bd | 120 | if (has_panicked) |
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121 | return; |
122 | ||
9ec52099 | 123 | if (shuting_down || kill_cad_pid(SIGINT, 1)) { |
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124 | /* No init process or button pressed twice. */ |
125 | ip32_machine_power_off(); | |
126 | } | |
127 | ||
128 | shuting_down = 1; | |
129 | blink_timer.data = POWERDOWN_FREQ; | |
130 | blink_timeout(POWERDOWN_FREQ); | |
131 | ||
132 | init_timer(&power_timer); | |
133 | power_timer.function = power_timeout; | |
134 | power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; | |
135 | add_timer(&power_timer); | |
136 | } | |
137 | ||
36d98e79 | 138 | static irqreturn_t ip32_rtc_int(int irq, void *dev_id) |
1da177e4 | 139 | { |
d2f82c2f | 140 | unsigned char reg_c; |
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141 | |
142 | reg_c = CMOS_READ(RTC_INTR_FLAGS); | |
143 | if (!(reg_c & RTC_IRQF)) { | |
42a3b4f2 | 144 | printk(KERN_WARNING |
bb09a954 | 145 | "%s: RTC IRQ without RTC_IRQF\n", __func__); |
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146 | } |
147 | /* Wait until interrupt goes away */ | |
950312ce | 148 | disable_irq_nosync(MACEISA_RTC_IRQ); |
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149 | init_timer(&debounce_timer); |
150 | debounce_timer.function = debounce; | |
151 | debounce_timer.expires = jiffies + 50; | |
152 | add_timer(&debounce_timer); | |
153 | ||
154 | printk(KERN_DEBUG "Power button pressed\n"); | |
155 | ip32_power_button(); | |
156 | return IRQ_HANDLED; | |
157 | } | |
158 | ||
159 | static int panic_event(struct notifier_block *this, unsigned long event, | |
160 | void *ptr) | |
161 | { | |
162 | unsigned long led; | |
163 | ||
f18190bd | 164 | if (has_panicked) |
1da177e4 | 165 | return NOTIFY_DONE; |
f18190bd | 166 | has_panicked = 1; |
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167 | |
168 | /* turn off the green LED */ | |
169 | led = mace->perif.ctrl.misc | MACEISA_LED_GREEN; | |
170 | mace->perif.ctrl.misc = led; | |
171 | ||
172 | blink_timer.data = PANIC_FREQ; | |
173 | blink_timeout(PANIC_FREQ); | |
174 | ||
175 | return NOTIFY_DONE; | |
176 | } | |
177 | ||
178 | static struct notifier_block panic_block = { | |
179 | .notifier_call = panic_event, | |
180 | }; | |
181 | ||
182 | static __init int ip32_reboot_setup(void) | |
183 | { | |
184 | /* turn on the green led only */ | |
185 | unsigned long led = mace->perif.ctrl.misc; | |
186 | led |= MACEISA_LED_RED; | |
187 | led &= ~MACEISA_LED_GREEN; | |
188 | mace->perif.ctrl.misc = led; | |
189 | ||
190 | _machine_restart = ip32_machine_restart; | |
191 | _machine_halt = ip32_machine_halt; | |
fcdb27ad | 192 | pm_power_off = ip32_machine_power_off; |
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193 | |
194 | init_timer(&blink_timer); | |
195 | blink_timer.function = blink_timeout; | |
e041c683 | 196 | atomic_notifier_chain_register(&panic_notifier_list, &panic_block); |
1da177e4 | 197 | |
c3dd8cdf RB |
198 | if (request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL)) |
199 | panic("Can't allocate MACEISA RTC IRQ"); | |
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200 | |
201 | return 0; | |
202 | } | |
203 | ||
204 | subsys_initcall(ip32_reboot_setup); |