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, 03, 05, 06 by Ralf Baechle 7 */ 8 #include <linux/linkage.h> 9 #include <linux/init.h> 10 #include <linux/ds1286.h> 11 #include <linux/module.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel.h> 14 #include <linux/sched.h> 15 #include <linux/notifier.h> 16 #include <linux/pm.h> 17 #include <linux/timer.h> 18 19 #include <asm/io.h> 20 #include <asm/irq.h> 21 #include <asm/system.h> 22 #include <asm/reboot.h> 23 #include <asm/sgialib.h> 24 #include <asm/sgi/ioc.h> 25 #include <asm/sgi/hpc3.h> 26 #include <asm/sgi/mc.h> 27 #include <asm/sgi/ip22.h> 28 29 /* 30 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds. 31 * I'm not sure if this feature is a good idea, for now it's here just to 32 * make the power button make behave just like under IRIX. 33 */ 34 #define POWERDOWN_TIMEOUT 120 35 36 /* 37 * Blink frequency during reboot grace period and when paniced. 38 */ 39 #define POWERDOWN_FREQ (HZ / 4) 40 #define PANIC_FREQ (HZ / 8) 41 42 static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer; 43 44 #define MACHINE_PANICED 1 45 #define MACHINE_SHUTTING_DOWN 2 46 47 static int machine_state; 48 49 static void ATTRIB_NORET sgi_machine_power_off(void) 50 { 51 unsigned int tmp; 52 53 local_irq_disable(); 54 55 /* Disable watchdog */ 56 tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff; 57 hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM; 58 hpc3c0->rtcregs[RTC_WSEC] = 0; 59 hpc3c0->rtcregs[RTC_WHSEC] = 0; 60 61 while (1) { 62 sgioc->panel = ~SGIOC_PANEL_POWERON; 63 /* Good bye cruel world ... */ 64 65 /* If we're still running, we probably got sent an alarm 66 interrupt. Read the flag to clear it. */ 67 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM]; 68 } 69 } 70 71 static void ATTRIB_NORET sgi_machine_restart(char *command) 72 { 73 if (machine_state & MACHINE_SHUTTING_DOWN) 74 sgi_machine_power_off(); 75 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; 76 while (1); 77 } 78 79 static void ATTRIB_NORET sgi_machine_halt(void) 80 { 81 if (machine_state & MACHINE_SHUTTING_DOWN) 82 sgi_machine_power_off(); 83 ArcEnterInteractiveMode(); 84 } 85 86 static void power_timeout(unsigned long data) 87 { 88 sgi_machine_power_off(); 89 } 90 91 static void blink_timeout(unsigned long data) 92 { 93 /* XXX fix this for fullhouse */ 94 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); 95 sgioc->reset = sgi_ioc_reset; 96 97 mod_timer(&blink_timer, jiffies + data); 98 } 99 100 static void debounce(unsigned long data) 101 { 102 del_timer(&debounce_timer); 103 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 104 /* Interrupt still being sent. */ 105 debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */ 106 add_timer(&debounce_timer); 107 108 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR | 109 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD | 110 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD; 111 112 return; 113 } 114 115 if (machine_state & MACHINE_PANICED) 116 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; 117 118 enable_irq(SGI_PANEL_IRQ); 119 } 120 121 static inline void power_button(void) 122 { 123 if (machine_state & MACHINE_PANICED) 124 return; 125 126 if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) { 127 /* No init process or button pressed twice. */ 128 sgi_machine_power_off(); 129 } 130 131 machine_state |= MACHINE_SHUTTING_DOWN; 132 blink_timer.data = POWERDOWN_FREQ; 133 blink_timeout(POWERDOWN_FREQ); 134 135 init_timer(&power_timer); 136 power_timer.function = power_timeout; 137 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; 138 add_timer(&power_timer); 139 } 140 141 void (*indy_volume_button)(int) = NULL; 142 143 EXPORT_SYMBOL(indy_volume_button); 144 145 static inline void volume_up_button(unsigned long data) 146 { 147 del_timer(&volume_timer); 148 149 if (indy_volume_button) 150 indy_volume_button(1); 151 152 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 153 volume_timer.expires = jiffies + (HZ / 100); 154 add_timer(&volume_timer); 155 } 156 } 157 158 static inline void volume_down_button(unsigned long data) 159 { 160 del_timer(&volume_timer); 161 162 if (indy_volume_button) 163 indy_volume_button(-1); 164 165 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 166 volume_timer.expires = jiffies + (HZ / 100); 167 add_timer(&volume_timer); 168 } 169 } 170 171 static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs) 172 { 173 unsigned int buttons; 174 175 buttons = sgioc->panel; 176 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR; 177 178 if (sgint->istat1 & SGINT_ISTAT1_PWR) { 179 /* Wait until interrupt goes away */ 180 disable_irq(SGI_PANEL_IRQ); 181 init_timer(&debounce_timer); 182 debounce_timer.function = debounce; 183 debounce_timer.expires = jiffies + 5; 184 add_timer(&debounce_timer); 185 } 186 187 /* Power button was pressed 188 * ioc.ps page 22: "The Panel Register is called Power Control by Full 189 * House. Only lowest 2 bits are used. Guiness uses upper four bits 190 * for volume control". This is not true, all bits are pulled high 191 * on fullhouse */ 192 if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) { 193 power_button(); 194 return IRQ_HANDLED; 195 } 196 /* TODO: mute/unmute */ 197 /* Volume up button was pressed */ 198 if (!(buttons & SGIOC_PANEL_VOLUPINTR)) { 199 init_timer(&volume_timer); 200 volume_timer.function = volume_up_button; 201 volume_timer.expires = jiffies + (HZ / 100); 202 add_timer(&volume_timer); 203 } 204 /* Volume down button was pressed */ 205 if (!(buttons & SGIOC_PANEL_VOLDNINTR)) { 206 init_timer(&volume_timer); 207 volume_timer.function = volume_down_button; 208 volume_timer.expires = jiffies + (HZ / 100); 209 add_timer(&volume_timer); 210 } 211 212 return IRQ_HANDLED; 213 } 214 215 static int panic_event(struct notifier_block *this, unsigned long event, 216 void *ptr) 217 { 218 if (machine_state & MACHINE_PANICED) 219 return NOTIFY_DONE; 220 machine_state |= MACHINE_PANICED; 221 222 blink_timer.data = PANIC_FREQ; 223 blink_timeout(PANIC_FREQ); 224 225 return NOTIFY_DONE; 226 } 227 228 static struct notifier_block panic_block = { 229 .notifier_call = panic_event, 230 }; 231 232 static int __init reboot_setup(void) 233 { 234 _machine_restart = sgi_machine_restart; 235 _machine_halt = sgi_machine_halt; 236 pm_power_off = sgi_machine_power_off; 237 238 request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL); 239 init_timer(&blink_timer); 240 blink_timer.function = blink_timeout; 241 atomic_notifier_chain_register(&panic_notifier_list, &panic_block); 242 243 return 0; 244 } 245 246 subsys_initcall(reboot_setup); 247