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) 1997, 1998, 2001, 2003 by Ralf Baechle 7 */ 8 #include <linux/init.h> 9 #include <linux/ds1286.h> 10 #include <linux/module.h> 11 #include <linux/interrupt.h> 12 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/notifier.h> 15 #include <linux/timer.h> 16 17 #include <asm/io.h> 18 #include <asm/irq.h> 19 #include <asm/system.h> 20 #include <asm/reboot.h> 21 #include <asm/sgialib.h> 22 #include <asm/sgi/ioc.h> 23 #include <asm/sgi/hpc3.h> 24 #include <asm/sgi/mc.h> 25 #include <asm/sgi/ip22.h> 26 27 /* 28 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds. 29 * I'm not sure if this feature is a good idea, for now it's here just to 30 * make the power button make behave just like under IRIX. 31 */ 32 #define POWERDOWN_TIMEOUT 120 33 34 /* 35 * Blink frequency during reboot grace period and when paniced. 36 */ 37 #define POWERDOWN_FREQ (HZ / 4) 38 #define PANIC_FREQ (HZ / 8) 39 40 static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer; 41 42 #define MACHINE_PANICED 1 43 #define MACHINE_SHUTTING_DOWN 2 44 static int machine_state = 0; 45 46 static void sgi_machine_restart(char *command) __attribute__((noreturn)); 47 static void sgi_machine_halt(void) __attribute__((noreturn)); 48 static void sgi_machine_power_off(void) __attribute__((noreturn)); 49 50 static void sgi_machine_restart(char *command) 51 { 52 if (machine_state & MACHINE_SHUTTING_DOWN) 53 sgi_machine_power_off(); 54 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; 55 while (1); 56 } 57 58 static void sgi_machine_halt(void) 59 { 60 if (machine_state & MACHINE_SHUTTING_DOWN) 61 sgi_machine_power_off(); 62 ArcEnterInteractiveMode(); 63 } 64 65 static void sgi_machine_power_off(void) 66 { 67 unsigned int tmp; 68 69 local_irq_disable(); 70 71 /* Disable watchdog */ 72 tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff; 73 hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM; 74 hpc3c0->rtcregs[RTC_WSEC] = 0; 75 hpc3c0->rtcregs[RTC_WHSEC] = 0; 76 77 while (1) { 78 sgioc->panel = ~SGIOC_PANEL_POWERON; 79 /* Good bye cruel world ... */ 80 81 /* If we're still running, we probably got sent an alarm 82 interrupt. Read the flag to clear it. */ 83 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM]; 84 } 85 } 86 87 static void power_timeout(unsigned long data) 88 { 89 sgi_machine_power_off(); 90 } 91 92 static void blink_timeout(unsigned long data) 93 { 94 /* XXX fix this for fullhouse */ 95 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); 96 sgioc->reset = sgi_ioc_reset; 97 98 mod_timer(&blink_timer, jiffies+data); 99 } 100 101 static void debounce(unsigned long data) 102 { 103 del_timer(&debounce_timer); 104 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 105 /* Interrupt still being sent. */ 106 debounce_timer.expires = jiffies + 5; /* 0.05s */ 107 add_timer(&debounce_timer); 108 109 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR | 110 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD | 111 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD; 112 113 return; 114 } 115 116 if (machine_state & MACHINE_PANICED) 117 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; 118 119 enable_irq(SGI_PANEL_IRQ); 120 } 121 122 static inline void power_button(void) 123 { 124 if (machine_state & MACHINE_PANICED) 125 return; 126 127 if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) { 128 /* No init process or button pressed twice. */ 129 sgi_machine_power_off(); 130 } 131 132 machine_state |= MACHINE_SHUTTING_DOWN; 133 blink_timer.data = POWERDOWN_FREQ; 134 blink_timeout(POWERDOWN_FREQ); 135 136 init_timer(&power_timer); 137 power_timer.function = power_timeout; 138 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; 139 add_timer(&power_timer); 140 } 141 142 void (*indy_volume_button)(int) = NULL; 143 144 EXPORT_SYMBOL(indy_volume_button); 145 146 static inline void volume_up_button(unsigned long data) 147 { 148 del_timer(&volume_timer); 149 150 if (indy_volume_button) 151 indy_volume_button(1); 152 153 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 154 volume_timer.expires = jiffies + 1; 155 add_timer(&volume_timer); 156 } 157 } 158 159 static inline void volume_down_button(unsigned long data) 160 { 161 del_timer(&volume_timer); 162 163 if (indy_volume_button) 164 indy_volume_button(-1); 165 166 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 167 volume_timer.expires = jiffies + 1; 168 add_timer(&volume_timer); 169 } 170 } 171 172 static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs) 173 { 174 unsigned int buttons; 175 176 buttons = sgioc->panel; 177 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR; 178 179 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 180 /* Wait until interrupt goes away */ 181 disable_irq(SGI_PANEL_IRQ); 182 init_timer(&debounce_timer); 183 debounce_timer.function = debounce; 184 debounce_timer.expires = jiffies + 5; 185 add_timer(&debounce_timer); 186 } 187 188 /* Power button was pressed 189 * ioc.ps page 22: "The Panel Register is called Power Control by Full 190 * House. Only lowest 2 bits are used. Guiness uses upper four bits 191 * for volume control". This is not true, all bits are pulled high 192 * on fullhouse */ 193 if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) { 194 power_button(); 195 return IRQ_HANDLED; 196 } 197 /* TODO: mute/unmute */ 198 /* Volume up button was pressed */ 199 if (!(buttons & SGIOC_PANEL_VOLUPINTR)) { 200 init_timer(&volume_timer); 201 volume_timer.function = volume_up_button; 202 volume_timer.expires = jiffies + 1; 203 add_timer(&volume_timer); 204 } 205 /* Volume down button was pressed */ 206 if (!(buttons & SGIOC_PANEL_VOLDNINTR)) { 207 init_timer(&volume_timer); 208 volume_timer.function = volume_down_button; 209 volume_timer.expires = jiffies + 1; 210 add_timer(&volume_timer); 211 } 212 213 return IRQ_HANDLED; 214 } 215 216 static int panic_event(struct notifier_block *this, unsigned long event, 217 void *ptr) 218 { 219 if (machine_state & MACHINE_PANICED) 220 return NOTIFY_DONE; 221 machine_state |= MACHINE_PANICED; 222 223 blink_timer.data = PANIC_FREQ; 224 blink_timeout(PANIC_FREQ); 225 226 return NOTIFY_DONE; 227 } 228 229 static struct notifier_block panic_block = { 230 .notifier_call = panic_event, 231 }; 232 233 static int __init reboot_setup(void) 234 { 235 _machine_restart = sgi_machine_restart; 236 _machine_halt = sgi_machine_halt; 237 _machine_power_off = sgi_machine_power_off; 238 239 request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL); 240 init_timer(&blink_timer); 241 blink_timer.function = blink_timeout; 242 notifier_chain_register(&panic_notifier_list, &panic_block); 243 244 return 0; 245 } 246 247 subsys_initcall(reboot_setup); 248