11da177e4SLinus Torvalds /*
21da177e4SLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public
31da177e4SLinus Torvalds * License. See the file "COPYING" in the main directory of this archive
41da177e4SLinus Torvalds * for more details.
51da177e4SLinus Torvalds *
6fcdb27adSRalf Baechle * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
71da177e4SLinus Torvalds */
871baa1a5SRalf Baechle #include <linux/linkage.h>
91da177e4SLinus Torvalds #include <linux/init.h>
10d4a5f6d7SAlexandre Belloni #include <linux/rtc/ds1286.h>
111da177e4SLinus Torvalds #include <linux/interrupt.h>
121da177e4SLinus Torvalds #include <linux/kernel.h>
133f07c014SIngo Molnar #include <linux/sched/signal.h>
14f39650deSAndy Shevchenko #include <linux/panic_notifier.h>
15fcdb27adSRalf Baechle #include <linux/pm.h>
161da177e4SLinus Torvalds #include <linux/timer.h>
171da177e4SLinus Torvalds
181da177e4SLinus Torvalds #include <asm/io.h>
191da177e4SLinus Torvalds #include <asm/irq.h>
201da177e4SLinus Torvalds #include <asm/reboot.h>
211da177e4SLinus Torvalds #include <asm/sgialib.h>
221da177e4SLinus Torvalds #include <asm/sgi/ioc.h>
231da177e4SLinus Torvalds #include <asm/sgi/hpc3.h>
241da177e4SLinus Torvalds #include <asm/sgi/mc.h>
251da177e4SLinus Torvalds #include <asm/sgi/ip22.h>
261da177e4SLinus Torvalds
271da177e4SLinus Torvalds /*
281da177e4SLinus Torvalds * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
291da177e4SLinus Torvalds * I'm not sure if this feature is a good idea, for now it's here just to
301da177e4SLinus Torvalds * make the power button make behave just like under IRIX.
311da177e4SLinus Torvalds */
321da177e4SLinus Torvalds #define POWERDOWN_TIMEOUT 120
331da177e4SLinus Torvalds
341da177e4SLinus Torvalds /*
35f18190bdSLee Revell * Blink frequency during reboot grace period and when panicked.
361da177e4SLinus Torvalds */
371da177e4SLinus Torvalds #define POWERDOWN_FREQ (HZ / 4)
381da177e4SLinus Torvalds #define PANIC_FREQ (HZ / 8)
391da177e4SLinus Torvalds
40b03d7b18SThomas Bogendoerfer static struct timer_list power_timer, blink_timer, debounce_timer;
41a66b899dSKees Cook static unsigned long blink_timer_timeout;
421da177e4SLinus Torvalds
43*d0ab32b0SGuilherme G. Piccoli #define MACHINE_PANICKED 1
441da177e4SLinus Torvalds #define MACHINE_SHUTTING_DOWN 2
451da177e4SLinus Torvalds
4671baa1a5SRalf Baechle static int machine_state;
471da177e4SLinus Torvalds
sgi_machine_power_off(void)48b3f6df9fSRobert P. J. Day static void __noreturn sgi_machine_power_off(void)
491da177e4SLinus Torvalds {
501da177e4SLinus Torvalds unsigned int tmp;
511da177e4SLinus Torvalds
521da177e4SLinus Torvalds local_irq_disable();
531da177e4SLinus Torvalds
541da177e4SLinus Torvalds /* Disable watchdog */
551da177e4SLinus Torvalds tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
561da177e4SLinus Torvalds hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
571da177e4SLinus Torvalds hpc3c0->rtcregs[RTC_WSEC] = 0;
581da177e4SLinus Torvalds hpc3c0->rtcregs[RTC_WHSEC] = 0;
591da177e4SLinus Torvalds
601da177e4SLinus Torvalds while (1) {
611da177e4SLinus Torvalds sgioc->panel = ~SGIOC_PANEL_POWERON;
621da177e4SLinus Torvalds /* Good bye cruel world ... */
631da177e4SLinus Torvalds
641da177e4SLinus Torvalds /* If we're still running, we probably got sent an alarm
651da177e4SLinus Torvalds interrupt. Read the flag to clear it. */
661da177e4SLinus Torvalds tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
671da177e4SLinus Torvalds }
681da177e4SLinus Torvalds }
691da177e4SLinus Torvalds
sgi_machine_restart(char * command)70b3f6df9fSRobert P. J. Day static void __noreturn sgi_machine_restart(char *command)
7171baa1a5SRalf Baechle {
7271baa1a5SRalf Baechle if (machine_state & MACHINE_SHUTTING_DOWN)
7371baa1a5SRalf Baechle sgi_machine_power_off();
7471baa1a5SRalf Baechle sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
7571baa1a5SRalf Baechle while (1);
7671baa1a5SRalf Baechle }
7771baa1a5SRalf Baechle
sgi_machine_halt(void)78b3f6df9fSRobert P. J. Day static void __noreturn sgi_machine_halt(void)
7971baa1a5SRalf Baechle {
8071baa1a5SRalf Baechle if (machine_state & MACHINE_SHUTTING_DOWN)
8171baa1a5SRalf Baechle sgi_machine_power_off();
8271baa1a5SRalf Baechle ArcEnterInteractiveMode();
8371baa1a5SRalf Baechle }
8471baa1a5SRalf Baechle
power_timeout(struct timer_list * unused)85a66b899dSKees Cook static void power_timeout(struct timer_list *unused)
861da177e4SLinus Torvalds {
871da177e4SLinus Torvalds sgi_machine_power_off();
881da177e4SLinus Torvalds }
891da177e4SLinus Torvalds
blink_timeout(struct timer_list * unused)90a66b899dSKees Cook static void blink_timeout(struct timer_list *unused)
911da177e4SLinus Torvalds {
921da177e4SLinus Torvalds /* XXX fix this for fullhouse */
931da177e4SLinus Torvalds sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
941da177e4SLinus Torvalds sgioc->reset = sgi_ioc_reset;
951da177e4SLinus Torvalds
96a66b899dSKees Cook mod_timer(&blink_timer, jiffies + blink_timer_timeout);
971da177e4SLinus Torvalds }
981da177e4SLinus Torvalds
debounce(struct timer_list * unused)99a66b899dSKees Cook static void debounce(struct timer_list *unused)
1001da177e4SLinus Torvalds {
1011da177e4SLinus Torvalds del_timer(&debounce_timer);
1021da177e4SLinus Torvalds if (sgint->istat1 & SGINT_ISTAT1_PWR) {
1031da177e4SLinus Torvalds /* Interrupt still being sent. */
10471baa1a5SRalf Baechle debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
1051da177e4SLinus Torvalds add_timer(&debounce_timer);
1061da177e4SLinus Torvalds
1071da177e4SLinus Torvalds sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
1081da177e4SLinus Torvalds SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
1091da177e4SLinus Torvalds SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
1101da177e4SLinus Torvalds
1111da177e4SLinus Torvalds return;
1121da177e4SLinus Torvalds }
1131da177e4SLinus Torvalds
114*d0ab32b0SGuilherme G. Piccoli if (machine_state & MACHINE_PANICKED)
1151da177e4SLinus Torvalds sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
1161da177e4SLinus Torvalds
1171da177e4SLinus Torvalds enable_irq(SGI_PANEL_IRQ);
1181da177e4SLinus Torvalds }
1191da177e4SLinus Torvalds
power_button(void)1201da177e4SLinus Torvalds static inline void power_button(void)
1211da177e4SLinus Torvalds {
122*d0ab32b0SGuilherme G. Piccoli if (machine_state & MACHINE_PANICKED)
1231da177e4SLinus Torvalds return;
1241da177e4SLinus Torvalds
1259ec52099SCedric Le Goater if ((machine_state & MACHINE_SHUTTING_DOWN) ||
1269ec52099SCedric Le Goater kill_cad_pid(SIGINT, 1)) {
1271da177e4SLinus Torvalds /* No init process or button pressed twice. */
1281da177e4SLinus Torvalds sgi_machine_power_off();
1291da177e4SLinus Torvalds }
1301da177e4SLinus Torvalds
1311da177e4SLinus Torvalds machine_state |= MACHINE_SHUTTING_DOWN;
132a66b899dSKees Cook blink_timer_timeout = POWERDOWN_FREQ;
133a66b899dSKees Cook blink_timeout(&blink_timer);
1341da177e4SLinus Torvalds
135a66b899dSKees Cook timer_setup(&power_timer, power_timeout, 0);
1361da177e4SLinus Torvalds power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
1371da177e4SLinus Torvalds add_timer(&power_timer);
1381da177e4SLinus Torvalds }
1391da177e4SLinus Torvalds
panel_int(int irq,void * dev_id)1407d12e780SDavid Howells static irqreturn_t panel_int(int irq, void *dev_id)
1411da177e4SLinus Torvalds {
1421da177e4SLinus Torvalds unsigned int buttons;
1431da177e4SLinus Torvalds
1441da177e4SLinus Torvalds buttons = sgioc->panel;
1451da177e4SLinus Torvalds sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
1461da177e4SLinus Torvalds
1471da177e4SLinus Torvalds if (sgint->istat1 & SGINT_ISTAT1_PWR) {
1481da177e4SLinus Torvalds /* Wait until interrupt goes away */
1497e9e05caSRalf Baechle disable_irq_nosync(SGI_PANEL_IRQ);
150a66b899dSKees Cook timer_setup(&debounce_timer, debounce, 0);
1511da177e4SLinus Torvalds debounce_timer.expires = jiffies + 5;
1521da177e4SLinus Torvalds add_timer(&debounce_timer);
1531da177e4SLinus Torvalds }
1541da177e4SLinus Torvalds
1551da177e4SLinus Torvalds /* Power button was pressed
1561da177e4SLinus Torvalds * ioc.ps page 22: "The Panel Register is called Power Control by Full
1571da177e4SLinus Torvalds * House. Only lowest 2 bits are used. Guiness uses upper four bits
1581da177e4SLinus Torvalds * for volume control". This is not true, all bits are pulled high
1591da177e4SLinus Torvalds * on fullhouse */
160b03d7b18SThomas Bogendoerfer if (!(buttons & SGIOC_PANEL_POWERINTR))
1611da177e4SLinus Torvalds power_button();
1621da177e4SLinus Torvalds
1631da177e4SLinus Torvalds return IRQ_HANDLED;
1641da177e4SLinus Torvalds }
1651da177e4SLinus Torvalds
panic_event(struct notifier_block * this,unsigned long event,void * ptr)1661da177e4SLinus Torvalds static int panic_event(struct notifier_block *this, unsigned long event,
1671da177e4SLinus Torvalds void *ptr)
1681da177e4SLinus Torvalds {
169*d0ab32b0SGuilherme G. Piccoli if (machine_state & MACHINE_PANICKED)
1701da177e4SLinus Torvalds return NOTIFY_DONE;
171*d0ab32b0SGuilherme G. Piccoli machine_state |= MACHINE_PANICKED;
1721da177e4SLinus Torvalds
173a66b899dSKees Cook blink_timer_timeout = PANIC_FREQ;
174a66b899dSKees Cook blink_timeout(&blink_timer);
1751da177e4SLinus Torvalds
1761da177e4SLinus Torvalds return NOTIFY_DONE;
1771da177e4SLinus Torvalds }
1781da177e4SLinus Torvalds
1791da177e4SLinus Torvalds static struct notifier_block panic_block = {
1801da177e4SLinus Torvalds .notifier_call = panic_event,
1811da177e4SLinus Torvalds };
1821da177e4SLinus Torvalds
reboot_setup(void)1831da177e4SLinus Torvalds static int __init reboot_setup(void)
1841da177e4SLinus Torvalds {
185754d0f23SRalf Baechle int res;
186754d0f23SRalf Baechle
1871da177e4SLinus Torvalds _machine_restart = sgi_machine_restart;
1881da177e4SLinus Torvalds _machine_halt = sgi_machine_halt;
189fcdb27adSRalf Baechle pm_power_off = sgi_machine_power_off;
1901da177e4SLinus Torvalds
191754d0f23SRalf Baechle res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
192754d0f23SRalf Baechle if (res) {
193754d0f23SRalf Baechle printk(KERN_ERR "Allocation of front panel IRQ failed\n");
194754d0f23SRalf Baechle return res;
195754d0f23SRalf Baechle }
196754d0f23SRalf Baechle
197a66b899dSKees Cook timer_setup(&blink_timer, blink_timeout, 0);
198e041c683SAlan Stern atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
1991da177e4SLinus Torvalds
2001da177e4SLinus Torvalds return 0;
2011da177e4SLinus Torvalds }
2021da177e4SLinus Torvalds
2031da177e4SLinus Torvalds subsys_initcall(reboot_setup);
204