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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> | |
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 | ||
35 | static struct timer_list power_timer, blink_timer, debounce_timer; | |
36 | static int has_paniced, shuting_down; | |
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 | { | |
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 | ||
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 | { | |
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 | ||
117 | static 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 | ||
137 | static 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 | ||
158 | static 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 | ||
177 | static struct notifier_block panic_block = { | |
178 | .notifier_call = panic_event, | |
179 | }; | |
180 | ||
181 | static __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 | ||
202 | subsys_initcall(ip32_reboot_setup); |