arch/mips/sgi-ip22/ip22-reset.c

   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);