rtc.c revision 32fa458688fa2e68bc433929b2d4941eef7efe39
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 25fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * Real Time Clock interface for Linux 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1996 Paul Gortmaker 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This driver allows use of the real time clock (built into 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * nearly all computers) from user space. It exports the /dev/rtc 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * interface supporting various ioctl() and also the 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * /proc/driver/rtc pseudo-file for status information. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The ioctls can be used to set the interrupt behaviour and 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * generation rate from the RTC via IRQ 8. Then the /dev/rtc 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * interface can be used to make use of these timer interrupts, 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be they interval or alarm based. 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The /dev/rtc interface will block on reads until an interrupt 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * has been received. If a RTC interrupt has already happened, 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it will output an unsigned long and then block. The output value 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * contains the interrupt status in the low byte and the number of 205fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * interrupts since the last read in the remaining high bytes. The 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * /dev/rtc interface can also be used with the select(2) call. 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * modify it under the terms of the GNU General Public License 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * as published by the Free Software Foundation; either version 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2 of the License, or (at your option) any later version. 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Based on other minimal char device drivers, like Alan's 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * watchdog, Ted's random, etc. etc. 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.07 Paul Gortmaker. 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.08 Miquel van Smoorenburg: disallow certain things on the 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * DEC Alpha as the CMOS clock is also used for other things. 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.09 Nikita Schmidt: epoch support and some Alpha cleanup. 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.09a Pete Zaitcev: Sun SPARC 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.09b Jeff Garzik: Modularize, init cleanup 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.09c Jeff Garzik: SMP cleanup 3812a0a703b3f07e5b01c81fe4f5d2a221c9318f16Ralf Baechle * 1.10 Paul Barton-Davis: add support for async I/O 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.10a Andrea Arcangeli: Alpha updates 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.10b Andrew Morton: SMP lock fix 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.10c Cesar Barros: SMP locking fixes and cleanup 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.10d Paul Gortmaker: delete paranoia check in rtc_exit 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness. 4412a0a703b3f07e5b01c81fe4f5d2a221c9318f16Ralf Baechle * 1.11 Takashi Iwai: Kernel access functions 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_register/rtc_unregister/rtc_control 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * CONFIG_HPET_EMULATE_RTC 4938e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * 1.12a Maciej W. Rozycki: Handle memory-mapped chips properly. 50b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * 1.12ac Alan Cox: Allow read access to the day of week register 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 53b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox#define RTC_VERSION "1.12ac" 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note that *all* calls to CMOS_READ and CMOS_WRITE are done with 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * interrupts disabled. Due to the index-port/data-port (0x70/0x71) 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * design of the RTC, we don't want two different things trying to 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * get to it at once. (e.g. the periodic 11 min sync from time.c vs. 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * this driver.) 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/interrupt.h> 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/miscdevice.h> 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioport.h> 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fcntl.h> 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mc146818rtc.h> 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/poll.h> 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/proc_fs.h> 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/seq_file.h> 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sysctl.h> 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/wait.h> 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/bcd.h> 7947f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna#include <linux/delay.h> 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/current.h> 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/system.h> 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8555f93afd89fe6b9b9e12cfb2d3eb1a68e21f529eChris Wright#ifdef CONFIG_X86 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/hpet.h> 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 89cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pci.h> 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/ebus.h> 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long rtc_port; 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_irq = PCI_IRQ_NONE; 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_HPET_RTC_IRQ 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef RTC_IRQ 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_has_irq = 1; 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef CONFIG_HPET_EMULATE_RTC 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define is_hpet_enabled() 0 1075fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_alarm_time(hrs, min, sec) 0 1085fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_periodic_freq(arg) 0 1095fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_mask_rtc_irq_bit(arg) 0 1105fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_rtc_irq_bit(arg) 0 1115fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_rtc_timer_init() do { } while (0) 1125fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_rtc_dropped_irq() 0 11332fa458688fa2e68bc433929b2d4941eef7efe39David Howells#define hpet_register_irq_handler(h) ({ 0; }) 11432fa458688fa2e68bc433929b2d4941eef7efe39David Howells#define hpet_unregister_irq_handler(h) ({ 0; }) 115533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton#ifdef RTC_IRQ 116533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Mortonstatic irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) 117533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton{ 118533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton return 0; 119533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton} 120533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton#endif 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 1227d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsextern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id); 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We sponge a minor off of the misc major. No need slurping 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * up another valuable major dev number for this. If you add 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * an ioctl, make sure you don't conflict with SPARC's RTC 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ioctls. 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct fasync_struct *rtc_async_queue; 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DECLARE_WAIT_QUEUE_HEAD(rtc_wait); 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 13740565f1962c5be9b9e285e05af01ab7771534868Jiri Slabystatic void rtc_dropped_irq(unsigned long data); 13840565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby 13940565f1962c5be9b9e285e05af01ab7771534868Jiri Slabystatic DEFINE_TIMER(rtc_irq_timer, rtc_dropped_irq, 0, 0); 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t rtc_read(struct file *file, char __user *buf, 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count, loff_t *ppos); 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_ioctl(struct inode *inode, struct file *file, 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int cmd, unsigned long arg); 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned int rtc_poll(struct file *file, poll_table *wait); 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1525fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic void get_rtc_alm_time(struct rtc_time *alm_tm); 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 154c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void set_rtc_irq_bit_locked(unsigned char bit); 155c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit_locked(unsigned char bit); 156c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai 157c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic inline void set_rtc_irq_bit(unsigned char bit) 158c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai{ 159c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irq(&rtc_lock); 160c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai set_rtc_irq_bit_locked(bit); 161c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irq(&rtc_lock); 162c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai} 163c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai 164c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit(unsigned char bit) 165c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai{ 166c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irq(&rtc_lock); 167c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai mask_rtc_irq_bit_locked(bit); 168c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irq(&rtc_lock); 169c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai} 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1729cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_open(struct inode *inode, struct file *file); 1749cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bits in rtc_status. (6 bits of room for future expansion) 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_TIMER_ON 0x02 /* missed irq timer active */ 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * protected by the big kernel lock. However, ioctl can still disable the timer 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in rtc_status and then with del_timer after the interrupt has read 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_status but before mod_timer is called, which would then reenable the 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * timer (but you would need to have an awful timing before you'd trip on it) 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1905fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_status; /* bitmapped status byte. */ 1915fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_freq; /* Current periodic IRQ rate */ 1925fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_irq_data; /* our output to the world */ 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_task_lock nests inside rtc_lock. 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEFINE_SPINLOCK(rtc_task_lock); 2005fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic rtc_task_t *rtc_callback; 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If this driver ever becomes modularised, it will be really nice 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to make the epoch retain its value across module reload... 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long epoch = 1900; /* year corresponding to 0x00 */ 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2105fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic const unsigned char days_in_mo[] = 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Returns true if a clock update is in progress 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline unsigned char rtc_is_updating(void) 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2180b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra unsigned long flags; 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char uip; 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2210b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra spin_lock_irqsave(&rtc_lock, flags); 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); 2230b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra spin_unlock_irqrestore(&rtc_lock, flags); 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return uip; 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2290f2ed4c6bae23d2b7ef0ea2d272377e3de700c0cThomas Gleixner * A very tiny interrupt handler. It runs with IRQF_DISABLED set, 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but there is possibility of conflicting with the set_rtc_mmss() 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * call (the rtc irq and the timer irq can easily run at the same 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * time in two different CPUs). So we need to serialize 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * accesses to the chip with the rtc_lock spinlock that each 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * architecture should implement in the timer code. 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2387d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsirqreturn_t rtc_interrupt(int irq, void *dev_id) 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Can be an alarm interrupt, update complete interrupt, 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * or a periodic interrupt. We store the status in the 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * low byte and the number of interrupts received since 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the last read in the remainder of rtc_irq_data. 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2475fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock(&rtc_lock); 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data += 0x100; 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data &= ~0xff; 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_hpet_enabled()) { 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * In this case it is HPET RTC interrupt handler 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * calling us, with the interrupt information 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * passed as arg1, instead of irq. 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (unsigned long)irq & 0xF0; 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2645fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock(&rtc_lock); 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now do the rest of the actions */ 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback) 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback->func(rtc_callback->private_data); 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 2715fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar wake_up_interruptible(&rtc_wait); 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2735fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * sysctl-tuning infrastructure. 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table rtc_table[] = { 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 2847735362ac32062725ba08ece014d669b9bede505Eric W. Biederman .ctl_name = CTL_UNNUMBERED, 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "max-user-freq", 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .data = &rtc_max_user_freq, 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .maxlen = sizeof(int), 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0644, 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .proc_handler = &proc_dointvec, 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { .ctl_name = 0 } 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table rtc_root[] = { 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 2967735362ac32062725ba08ece014d669b9bede505Eric W. Biederman .ctl_name = CTL_UNNUMBERED, 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "rtc", 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0555, 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .child = rtc_table, 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { .ctl_name = 0 } 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table dev_root[] = { 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .ctl_name = CTL_DEV, 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "dev", 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0555, 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .child = rtc_root, 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { .ctl_name = 0 } 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct ctl_table_header *sysctl_header; 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init init_sysctl(void) 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3180b4d414714f0d2f922d39424b0c5c82ad900a381Eric W. Biederman sysctl_header = register_sysctl_table(dev_root); 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit cleanup_sysctl(void) 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_sysctl_table(sysctl_header); 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Now all the various file operations that we export. 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t rtc_read(struct file *file, char __user *buf, 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count, loff_t *ppos) 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DECLARE_WAITQUEUE(wait, current); 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long data; 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ssize_t retval; 3405fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 34438e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki /* 34538e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * Historically this function used to assume that sizeof(unsigned long) 34638e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * is the same in userspace and kernelspace. This lead to problems 34738e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * for configurations with multiple ABIs such a the MIPS o32 and 64 34838e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * ABIs supported on the same kernel. So now we support read of both 34938e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the 35038e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * userspace ABI. 35138e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki */ 35238e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (count != sizeof(unsigned int) && count != sizeof(unsigned long)) 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds add_wait_queue(&rtc_wait, &wait); 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* First make it right. Then make it fast. Putting this whole 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * block within the parentheses of a while would be too 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * confusing. And no, xchg() is not the answer. */ 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds __set_current_state(TASK_INTERRUPTIBLE); 3635fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 3645fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds data = rtc_irq_data; 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 3675fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (data != 0) 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (file->f_flags & O_NONBLOCK) { 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -EAGAIN; 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (signal_pending(current)) { 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -ERESTARTSYS; 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds schedule(); 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while (1); 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3835fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (count == sizeof(unsigned int)) { 3845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar retval = put_user(data, 3855fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (unsigned int __user *)buf) ?: sizeof(int); 3865fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar } else { 3875fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar retval = put_user(data, 3885fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (unsigned long __user *)buf) ?: sizeof(long); 3895fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar } 39038e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (!retval) 39138e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki retval = count; 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 393cc0a8fbb7ce00f65dc337dd91389b7151f44ed30Milind Arun Choudhary __set_current_state(TASK_RUNNING); 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds remove_wait_queue(&rtc_wait, &wait); 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return retval; 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4025fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar struct rtc_time wtime; 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) { 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (cmd) { 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_OFF: 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_ON: 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_OFF: 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_ON: 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_OFF: 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_ON: 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_READ: 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_SET: 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }; 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (cmd) { 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mask_rtc_irq_bit(RTC_AIE); 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_ON: /* Allow alarm interrupts. */ 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_rtc_irq_bit(RTC_AIE); 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4345fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 4355fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 4365fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4375fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irqsave(&rtc_lock, flags); 438c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai mask_rtc_irq_bit_locked(RTC_PIE); 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4435fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 4445fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_ON: /* Allow periodic ints */ 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4495fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 4505fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 4515fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We don't really want Joe User enabling more 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * than 64Hz of interrupts on a multi-user machine. 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!kernel && (rtc_freq > rtc_max_user_freq) && 4575fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (!capable(CAP_SYS_RESOURCE))) 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4605fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irqsave(&rtc_lock, flags); 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(rtc_status & RTC_TIMER_ON)) { 46240565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 46340565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby 2*HZ/100); 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_TIMER_ON; 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 466c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai set_rtc_irq_bit_locked(RTC_PIE); 4675fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 4685fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_OFF: /* Mask ints from RTC updates. */ 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mask_rtc_irq_bit(RTC_UIE); 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_ON: /* Allow ints for RTC updates. */ 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_rtc_irq_bit(RTC_UIE); 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_ALM_READ: /* Read the present alarm time */ 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This returns a struct rtc_time. Reading >= 0xc0 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * means "don't care" or "match all". Only the tm_hour, 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * tm_min, and tm_sec values are filled in. 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(&wtime, 0, sizeof(struct rtc_time)); 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_rtc_alm_time(&wtime); 4915fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar break; 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_ALM_SET: /* Store a time into the alarm */ 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This expects a struct rtc_time. Writing 0xff means 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * "don't care" or "match all". Only the tm_hour, 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * tm_min and tm_sec are used. 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char hrs, min, sec; 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time alm_tm; 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sizeof(struct rtc_time))) 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hrs = alm_tm.tm_hour; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = alm_tm.tm_min; 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = alm_tm.tm_sec; 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (hpet_set_alarm_time(hrs, min, sec)) { 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Fallthru and set alarm time in CMOS too, 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * so that we will get proper value in RTC_ALM_READ 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || 5195fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar RTC_ALWAYS_BCD) { 5205fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (sec < 60) 5215fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar BIN_TO_BCD(sec); 5225fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5235fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar sec = 0xff; 5245fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5255fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (min < 60) 5265fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar BIN_TO_BCD(min); 5275fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5285fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar min = 0xff; 5295fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5305fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (hrs < 24) 5315fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar BIN_TO_BCD(hrs); 5325fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5335fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar hrs = 0xff; 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(hrs, RTC_HOURS_ALARM); 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(min, RTC_MINUTES_ALARM); 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(sec, RTC_SECONDS_ALARM); 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_RD_TIME: /* Read the time/date from RTC */ 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(&wtime, 0, sizeof(struct rtc_time)); 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_get_rtc_time(&wtime); 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_SET_TIME: /* Set the RTC */ 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time rtc_tm; 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char mon, day, hrs, min, sec, leap_yr; 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char save_control, save_freq_select; 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int yrs; 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int real_yrs; 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!capable(CAP_SYS_TIME)) 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sizeof(struct rtc_time))) 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = rtc_tm.tm_year + 1900; 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds day = rtc_tm.tm_mday; 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hrs = rtc_tm.tm_hour; 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = rtc_tm.tm_min; 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = rtc_tm.tm_sec; 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs < 1970) 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((mon > 12) || (day == 0)) 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5825fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((hrs >= 24) || (min >= 60) || (sec >= 60)) 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5865fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar yrs -= epoch; 5875fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (yrs > 255) /* They are unsigned */ 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_yrs = yrs; 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = 72; 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We want to keep the year set to 73 until March 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for non-leap years, so that Feb, 29th is handled 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * correctly. 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!leap_yr && mon < 3) { 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_yrs--; 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = 73; 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* These limits and adjustments are independent of 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * whether the chip is in binary mode or not. 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs > 169) { 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs >= 100) 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs -= 100; 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds || RTC_ALWAYS_BCD) { 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(sec); 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(min); 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(hrs); 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(day); 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(mon); 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BIN_TO_BCD(yrs); 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds save_control = CMOS_READ(RTC_CONTROL); 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds save_freq_select = CMOS_READ(RTC_FREQ_SELECT); 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(real_yrs, RTC_DEC_YEAR); 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(yrs, RTC_YEAR); 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(mon, RTC_MONTH); 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(day, RTC_DAY_OF_MONTH); 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(hrs, RTC_HOURS); 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(min, RTC_MINUTES); 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(sec, RTC_SECONDS); 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(save_control, RTC_CONTROL); 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return put_user(rtc_freq, (unsigned long __user *)arg); 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_SET: /* Set periodic IRQ rate. */ 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int tmp = 0; 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 6555fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 6565fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6585fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The max we can do is 8192Hz. 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((arg < 2) || (arg > 8192)) 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We don't really want Joe User generating more 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * than 64Hz of interrupts on a multi-user machine. 6661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6675fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!kernel && (arg > rtc_max_user_freq) && 6685fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar !capable(CAP_SYS_RESOURCE)) 6691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 6701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (arg > (1<<tmp)) 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp++; 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check that the input was really a power of 2. 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (arg != (1<<tmp)) 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 680c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irqsave(&rtc_lock, flags); 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (hpet_set_periodic_freq(arg)) { 682c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_lock, flags); 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_freq = arg; 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val |= (16 - tmp); 6891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_FREQ_SELECT); 690c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_lock, flags); 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_EPOCH_READ: /* Read the epoch. */ 6951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6965fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return put_user(epoch, (unsigned long __user *)arg); 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_EPOCH_SET: /* Set the epoch. */ 6991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 7005fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 7011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * There were no RTC clocks before 1900. 7021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (arg < 1900) 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!capable(CAP_SYS_TIME)) 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = arg; 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOTTY; 7141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7155fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return copy_to_user((void __user *)arg, 7165fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar &wtime, sizeof wtime) ? -EFAULT : 0; 7171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 7201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long arg) 7211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return rtc_do_ioctl(cmd, arg, 0); 7231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We enforce only one user at a time here with the open/close. 7271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Also clear the previous interrupt data on an open, and clean 7281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * up things on a close. 7291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* We use rtc_lock to protect against concurrent opens. So the BKL is not 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * needed here. Or anywhere else in this driver. */ 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_open(struct inode *inode, struct file *file) 7341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7355fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7375fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (rtc_status & RTC_IS_OPEN) 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_busy; 7391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_IS_OPEN; 7411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 7435fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsout_busy: 7475fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7515fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic int rtc_fasync(int fd, struct file *filp, int on) 7521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7535fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return fasync_helper(fd, filp, on, &rtc_async_queue); 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_release(struct inode *inode, struct file *file) 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char tmp; 7601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq; 7631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Turn off all interrupts once the device is no longer 7661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in use, and clear the data. 7671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = CMOS_READ(RTC_CONTROL); 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_PIE; 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_AIE; 7741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_UIE; 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(tmp, RTC_CONTROL); 7761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 7791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (file->f_flags & FASYNC) 7855fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar rtc_fasync(-1, file, 0); 7861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq: 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7895fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_IS_OPEN; 7925fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7935fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Called without the kernel lock - fine */ 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned int rtc_poll(struct file *file, poll_table *wait) 8001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long l; 8021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds poll_wait(file, &rtc_wait, wait); 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8085fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds l = rtc_irq_data; 8105fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (l != 0) 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return POLLIN | POLLRDNORM; 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_register(rtc_task_t *task) 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (task == NULL || task->func == NULL) 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_IS_OPEN) { 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback) { 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_IS_OPEN; 8371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback = task; 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8435fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_register); 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_unregister(rtc_task_t *task) 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char tmp; 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 8531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback != task) { 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback = NULL; 8605fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* disable controls */ 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { 8631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = CMOS_READ(RTC_CONTROL); 8641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_PIE; 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_AIE; 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_UIE; 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(tmp, RTC_CONTROL); 8681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 8691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_IS_OPEN; 8751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8805fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_unregister); 8811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 887c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai unsigned long flags; 888c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET) 889c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai return -EINVAL; 890c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irqsave(&rtc_task_lock, flags); 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback != task) { 892c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_task_lock, flags); 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 895c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_task_lock, flags); 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return rtc_do_ioctl(cmd, arg, 1); 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8995fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_control); 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 9021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The various file operations we support. 9031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 90562322d2554d2f9680c8ace7bbf1f97d8fa84ad1aArjan van de Venstatic const struct file_operations rtc_fops = { 9061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .llseek = no_llseek, 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .read = rtc_read, 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .poll = rtc_poll, 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .ioctl = rtc_ioctl, 9131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .open = rtc_open, 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .release = rtc_release, 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .fasync = rtc_fasync, 9161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct miscdevice rtc_dev = { 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .minor = RTC_MINOR, 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "rtc", 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .fops = &rtc_fops, 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9249cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 92562322d2554d2f9680c8ace7bbf1f97d8fa84ad1aArjan van de Venstatic const struct file_operations rtc_proc_fops = { 9265fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .owner = THIS_MODULE, 9275fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .open = rtc_proc_open, 9285fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .read = seq_read, 9295fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .llseek = seq_lseek, 9305fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .release = single_release, 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9349626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaasstatic resource_size_t rtc_size; 9359626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9369626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaasstatic struct resource * __init rtc_request_region(resource_size_t size) 9379626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas{ 9389626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas struct resource *r; 9399626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9409626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (RTC_IOMAPPED) 9419626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = request_region(RTC_PORT(0), size, "rtc"); 9429626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas else 9439626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = request_mem_region(RTC_PORT(0), size, "rtc"); 9449626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9459626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (r) 9469626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas rtc_size = size; 9479626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9489626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas return r; 9499626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas} 9509626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9514c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaasstatic void rtc_release_region(void) 9524c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas{ 9534c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas if (RTC_IOMAPPED) 9549626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas release_region(RTC_PORT(0), rtc_size); 9554c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas else 9569626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas release_mem_region(RTC_PORT(0), rtc_size); 9574c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas} 9584c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init rtc_init(void) 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9619cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 9621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct proc_dir_entry *ent; 9639cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 9641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__alpha__) || defined(__mips__) 9651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int year, ctrl; 9661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *guess = NULL; 9671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 968cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 9691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct linux_ebus *ebus; 9701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct linux_ebus_device *edev; 9719cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#else 97238e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki void *r; 9739cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef RTC_IRQ 9749cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich irq_handler_t rtc_int_handler_ptr; 9759cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 97638e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki#endif 9771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 978cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 9791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for_each_ebus(ebus) { 9801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for_each_ebusdev(edev, ebus) { 9815fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (strcmp(edev->prom_node->name, "rtc") == 0) { 9821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_port = edev->resource[0].start; 9831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq = edev->irqs[0]; 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto found; 9851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 988f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc_init: no PC rtc found\n"); 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 9911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsfound: 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_irq == PCI_IRQ_NONE) { 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_has_irq = 0; 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq; 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * XXX Interrupt pin #7 in Espresso is shared between RTC and 100053d0fc27af3a3ab22c0ffb67857adfa18977e681David S. Miller * PCI Slot 2 INTA# (and some INTx# in Slot 1). 10011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10025fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", 10035fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (void *)&rtc_port)) { 1004f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq: 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 10109626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = rtc_request_region(RTC_IO_EXTENT); 10119626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 10129626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas /* 10139626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * If we've already requested a smaller range (for example, because 10149626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * PNPBIOS or ACPI told us how the device is configured), the request 10159626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * above might fail because it's too big. 10169626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * 10179626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * If so, request just the range we actually use. 10189626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas */ 10199626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (!r) 10209626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = rtc_request_region(RTC_IO_EXTENT_USED); 102138e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (!r) { 1022f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich#ifdef RTC_IRQ 1023f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 1024f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich#endif 102538e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki printk(KERN_ERR "rtc: I/O resource %lx is not free.\n", 102638e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki (long)(RTC_PORT(0))); 10271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 10311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_hpet_enabled()) { 1032f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle int err; 1033f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_int_handler_ptr = hpet_rtc_interrupt; 1035f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle err = hpet_register_irq_handler(rtc_interrupt); 1036f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle if (err != 0) { 1037f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle printk(KERN_WARNING "hpet_register_irq_handler failed " 1038f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle "in rtc_init()."); 1039f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle return err; 1040f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle } 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_int_handler_ptr = rtc_interrupt; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10455fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, 10465fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar "rtc", NULL)) { 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ 1048f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); 10504c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 10515fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hpet_rtc_timer_init(); 10551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1058cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#endif /* CONFIG_SPARC32 vs. others */ 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (misc_register(&rtc_dev)) { 10611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 10621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_irq(RTC_IRQ, NULL); 1063f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle hpet_unregister_irq_handler(rtc_interrupt); 1064f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10664c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 10671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENODEV; 10681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10709cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 10711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ent = create_proc_entry("driver/rtc", 0, NULL); 10729cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich if (ent) 10739cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich ent->proc_fops = &rtc_proc_fops; 10749cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich else 10759cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich printk(KERN_WARNING "rtc: Failed to register with procfs.\n"); 10761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__alpha__) || defined(__mips__) 10791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_freq = HZ; 10805fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Each operating system on an Alpha uses its own epoch. 10821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Let's try to guess which one we are using now. */ 10835fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_is_updating() != 0) 108547f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna msleep(20); 10865fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 10881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year = CMOS_READ(RTC_YEAR); 10891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 10901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 10915fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) 10931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(year); /* This should never happen... */ 10945fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (year < 20) { 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 2000; 10971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "SRM (post-2000)"; 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 20 && year < 48) { 10991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1980; 11001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "ARC console"; 11011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 48 && year < 72) { 11021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1952; 11031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Digital UNIX"; 11041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__mips__) 11051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 72 && year < 74) { 11061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 2000; 11071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Digital DECstation"; 11081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 70) { 11101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1900; 11111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Standard PC (1900)"; 11121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (guess) 11155fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", 11165fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar guess, epoch); 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 11201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq2; 11211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 11231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_freq = 1024; 11241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_set_periodic_freq(rtc_freq)) { 11255fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 11265fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * Initialize periodic frequency to CMOS reset default, 11275fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * which is 1024Hz 11285fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar */ 11295fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), 11305fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar RTC_FREQ_SELECT); 11311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 11331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq2: 11341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (void) init_sysctl(); 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); 11391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11435fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic void __exit rtc_exit(void) 11441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cleanup_sysctl(); 11465fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar remove_proc_entry("driver/rtc", NULL); 11471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds misc_deregister(&rtc_dev); 11481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1149cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 11501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq) 11515fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar free_irq(rtc_irq, &rtc_port); 11521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11534c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 11541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1155f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle if (rtc_has_irq) { 11565fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar free_irq(RTC_IRQ, NULL); 1157f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle hpet_unregister_irq_handler(hpet_rtc_interrupt); 1158f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle } 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1160cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#endif /* CONFIG_SPARC32 */ 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(rtc_init); 11641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(rtc_exit); 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 11685fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * At IRQ rates >= 4096Hz, an interrupt may get lost altogether. 11691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (usually during an IDE disk interrupt, with IRQ unmasking off) 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Since the interrupt handler doesn't get called, the IRQ status 11711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * byte doesn't get read, and the RTC stops generating interrupts. 11721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A timer is set, and will call this function if/when that happens. 11731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * To get it out of this stalled state, we just read the status. 11741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. 11755fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * (You *really* shouldn't be trying to use a non-realtime system 11761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for something that requires a steady > 1KHz signal anyways.) 11771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 11781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void rtc_dropped_irq(unsigned long data) 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long freq; 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11835fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 11841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (hpet_rtc_dropped_irq()) { 11861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 11871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 11881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Just in case someone disabled the timer from behind our back... */ 11911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data += ((rtc_freq/HZ)<<8); 11951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data &= ~0xff; 11961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ 11971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq = rtc_freq; 11991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 12011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12025fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (printk_ratelimit()) { 12035fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", 12045fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar freq); 12055fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar } 12061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now we have new data */ 12081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wake_up_interruptible(&rtc_wait); 12091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12105fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); 12111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 12131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12149cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 12151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 12161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Info exported via "/proc/driver/rtc". 12171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_show(struct seq_file *seq, void *v) 12201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define YN(bit) ((ctrl & bit) ? "yes" : "no") 12221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define NY(bit) ((ctrl & bit) ? "no" : "yes") 12231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time tm; 12241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char batt, ctrl; 12251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long freq; 12261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 12281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds batt = CMOS_READ(RTC_VALID) & RTC_VRT; 12291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 12301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq = rtc_freq; 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 12321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_get_rtc_time(&tm); 12351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 12371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * There is no way to tell if the luser has the RTC set for local 12381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * time or for Universal Standard Time (GMT). Probably local though. 12391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, 12411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_time\t: %02d:%02d:%02d\n" 12421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_date\t: %04d-%02d-%02d\n" 12431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_epoch\t: %04lu\n", 12441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tm.tm_hour, tm.tm_min, tm.tm_sec, 12451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); 12461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_rtc_alm_time(&tm); 12481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 12501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will 12511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * match any value for that particular field. Values that are 12521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * greater than a valid time, but less than 0xc0 shouldn't appear. 12531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "alarm\t\t: "); 12551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_hour <= 24) 12561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d:", tm.tm_hour); 12571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**:"); 12591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_min <= 59) 12611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d:", tm.tm_min); 12621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**:"); 12641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_sec <= 59) 12661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d\n", tm.tm_sec); 12671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**\n"); 12691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, 12711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "DST_enable\t: %s\n" 12721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "BCD\t\t: %s\n" 12731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "24hr\t\t: %s\n" 12741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "square_wave\t: %s\n" 12751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "alarm_IRQ\t: %s\n" 12761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "update_IRQ\t: %s\n" 12771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "periodic_IRQ\t: %s\n" 12781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "periodic_freq\t: %ld\n" 12791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "batt_status\t: %s\n", 12801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_DST_EN), 12811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds NY(RTC_DM_BINARY), 12821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_24H), 12831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_SQWE), 12841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_AIE), 12851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_UIE), 12861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_PIE), 12871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq, 12881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds batt ? "okay" : "dead"); 12891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 12911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef YN 12921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef NY 12931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_open(struct inode *inode, struct file *file) 12961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return single_open(file, rtc_proc_show, NULL); 12981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12999cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 13001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid rtc_get_rtc_time(struct rtc_time *rtc_tm) 13021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13030f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar unsigned long uip_watchdog = jiffies, flags; 13041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char ctrl; 13051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int real_year; 13071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * read RTC once any update in progress is done. The update 131147f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna * can take just over 2ms. We wait 20ms. There is no need to 13121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. 13131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If you need to know *exactly* when a second has started, enable 13145fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * periodic update complete interrupts, (via ioctl) and then 13151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * immediately read /dev/rtc which will block until you get the IRQ. 13161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Once the read clears, read the RTC time (again via ioctl). Easy. 13171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1319358333a0cb4a6d279806e38d0368b79066dbe5e7Steven Rostedt while (rtc_is_updating() != 0 && jiffies - uip_watchdog < 2*HZ/100) 1320403fe5ae57c831968c3dbbaba291ae825a1c5aaaPetr Vandrovec cpu_relax(); 13211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Only the values that we read from the RTC are set. We leave 1324b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * tm_wday, tm_yday and tm_isdst untouched. Note that while the 1325b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is 1326b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * only updated by the RTC when initially set to a non-zero value. 13271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13280f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar spin_lock_irqsave(&rtc_lock, flags); 13291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); 13301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); 13311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); 13321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); 13331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); 13341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year = CMOS_READ(RTC_YEAR); 1335b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox /* Only set from 2.6.16 onwards */ 1336b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); 1337b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox 13381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_year = CMOS_READ(RTC_DEC_YEAR); 13401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 13420f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 13431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13445fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { 13451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_sec); 13461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_min); 13471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_hour); 13481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_mday); 13491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_mon); 13501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(rtc_tm->tm_year); 1351b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox BCD_TO_BIN(rtc_tm->tm_wday); 13521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year += real_year - 72; 13561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Account for differences between how the RTC uses the values 13601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and how they are defined in a struct rtc_time; 13611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13625fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar rtc_tm->tm_year += epoch - 1900; 13635fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (rtc_tm->tm_year <= 69) 13641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year += 100; 13651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mon--; 13671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void get_rtc_alm_time(struct rtc_time *alm_tm) 13701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char ctrl; 13721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Only the values that we read from the RTC are set. That 13751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * means only tm_hour, tm_min, and tm_sec. 13761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 13781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); 13791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); 13801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); 13811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 13821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 13831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { 13851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(alm_tm->tm_sec); 13861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(alm_tm->tm_min); 13871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BCD_TO_BIN(alm_tm->tm_hour); 13881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 13921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 13931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Used to disable/enable interrupts for any one of UIE, AIE, PIE. 13941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Rumour has it that if you frob the interrupt enable/disable 13951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to 13961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ensure you actually start getting interrupts. Probably for 13971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * compatibility with older/broken chipset RTC implementations. 13981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We also clear out any old irq data after an ioctl() that 13991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * meddles with the interrupt enable/disable bits. 14001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 14011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1402c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit_locked(unsigned char bit) 14031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 14041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 14051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1406c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (hpet_mask_rtc_irq_bit(bit)) 14071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 14081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_CONTROL); 14091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val &= ~bit; 14101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_CONTROL); 14111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 14121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 14141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1416c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void set_rtc_irq_bit_locked(unsigned char bit) 14171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 14181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 14191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1420c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (hpet_set_rtc_irq_bit(bit)) 14211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 14221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_CONTROL); 14231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val |= bit; 14241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_CONTROL); 14251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 14261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 14281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 14301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Paul Gortmaker"); 14321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 14331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_ALIAS_MISCDEV(RTC_MINOR); 1434