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 51048cd5888f81713af4597bde5815f32d58fdf5b0David John * 1.12b David John: Remove calls to the BKL. 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 54048cd5888f81713af4597bde5815f32d58fdf5b0David John#define RTC_VERSION "1.12b" 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note that *all* calls to CMOS_READ and CMOS_WRITE are done with 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * interrupts disabled. Due to the index-port/data-port (0x70/0x71) 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * design of the RTC, we don't want two different things trying to 605196d20305d5e30d871111d3a876cf067dd94255Michael Witten * get to it at once. (e.g. the periodic 11 min sync from 615196d20305d5e30d871111d3a876cf067dd94255Michael Witten * kernel/time/ntp.c vs. this driver.) 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/interrupt.h> 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/miscdevice.h> 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioport.h> 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fcntl.h> 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mc146818rtc.h> 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/poll.h> 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/proc_fs.h> 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/seq_file.h> 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 7786ae13b006e48959981248493efd3ff4b2828b3dIngo Molnar#include <linux/sched.h> 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sysctl.h> 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/wait.h> 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/bcd.h> 8147f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna#include <linux/delay.h> 8253f1b1433da7eac2607a4a0898a221a4485fd732Alan Cox#include <linux/uaccess.h> 83a28ee477e5e5e183fa0289841fd90f350a6e0415Christian Dietrich#include <linux/ratelimit.h> 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/current.h> 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8755f93afd89fe6b9b9e12cfb2d3eb1a68e21f529eChris Wright#ifdef CONFIG_X86 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/hpet.h> 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 91cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 9275081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller#include <linux/of.h> 9375081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller#include <linux/of_device.h> 9475081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller#include <asm/io.h> 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long rtc_port; 9775081322c9d0d56f8880178f9fcc93778bcf0220David S. Millerstatic int rtc_irq; 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1000f4d3fd8ac76122675de900d67a470306647374bDavid Brownell#ifdef CONFIG_HPET_EMULATE_RTC 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef RTC_IRQ 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_has_irq = 1; 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef CONFIG_HPET_EMULATE_RTC 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define is_hpet_enabled() 0 1105fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_alarm_time(hrs, min, sec) 0 1115fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_periodic_freq(arg) 0 1125fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_mask_rtc_irq_bit(arg) 0 1135fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_set_rtc_irq_bit(arg) 0 1145fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_rtc_timer_init() do { } while (0) 1155fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar#define hpet_rtc_dropped_irq() 0 11632fa458688fa2e68bc433929b2d4941eef7efe39David Howells#define hpet_register_irq_handler(h) ({ 0; }) 11732fa458688fa2e68bc433929b2d4941eef7efe39David Howells#define hpet_unregister_irq_handler(h) ({ 0; }) 118533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton#ifdef RTC_IRQ 119533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Mortonstatic irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) 120533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton{ 121533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton return 0; 122533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton} 123533ffc289db9f44c0633d3a7b87243b5740b02b2Andrew Morton#endif 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We sponge a minor off of the misc major. No need slurping 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * up another valuable major dev number for this. If you add 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * an ioctl, make sure you don't conflict with SPARC's RTC 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ioctls. 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct fasync_struct *rtc_async_queue; 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DECLARE_WAIT_QUEUE_HEAD(rtc_wait); 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 13840565f1962c5be9b9e285e05af01ab7771534868Jiri Slabystatic void rtc_dropped_irq(unsigned long data); 13940565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby 14040565f1962c5be9b9e285e05af01ab7771534868Jiri Slabystatic DEFINE_TIMER(rtc_irq_timer, rtc_dropped_irq, 0, 0); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t rtc_read(struct file *file, char __user *buf, 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count, loff_t *ppos); 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14653f1b1433da7eac2607a4a0898a221a4485fd732Alan Coxstatic long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1479580d85f9cdb076c4bfb467bc6c0d3c5e499957aAdrian Bunkstatic void rtc_get_rtc_time(struct rtc_time *rtc_tm); 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned int rtc_poll(struct file *file, poll_table *wait); 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1535fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic void get_rtc_alm_time(struct rtc_time *alm_tm); 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 155c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void set_rtc_irq_bit_locked(unsigned char bit); 156c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit_locked(unsigned char bit); 157c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai 158c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic inline void set_rtc_irq_bit(unsigned char bit) 159c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai{ 160c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irq(&rtc_lock); 161c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai set_rtc_irq_bit_locked(bit); 162c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irq(&rtc_lock); 163c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai} 164c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai 165c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit(unsigned char bit) 166c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai{ 167c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irq(&rtc_lock); 168c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai mask_rtc_irq_bit_locked(bit); 169c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irq(&rtc_lock); 170c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai} 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1739cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_open(struct inode *inode, struct file *file); 1759cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bits in rtc_status. (6 bits of room for future expansion) 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_TIMER_ON 0x02 /* missed irq timer active */ 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is 186048cd5888f81713af4597bde5815f32d58fdf5b0David John * protected by the spin lock rtc_lock. However, ioctl can still disable the 187048cd5888f81713af4597bde5815f32d58fdf5b0David John * timer in rtc_status and then with del_timer after the interrupt has read 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_status but before mod_timer is called, which would then reenable the 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * timer (but you would need to have an awful timing before you'd trip on it) 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1915fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_status; /* bitmapped status byte. */ 1925fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_freq; /* Current periodic IRQ rate */ 1935fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic unsigned long rtc_irq_data; /* our output to the world */ 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * rtc_task_lock nests inside rtc_lock. 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEFINE_SPINLOCK(rtc_task_lock); 2015fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic rtc_task_t *rtc_callback; 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If this driver ever becomes modularised, it will be really nice 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to make the epoch retain its value across module reload... 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long epoch = 1900; /* year corresponding to 0x00 */ 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2115fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic const unsigned char days_in_mo[] = 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Returns true if a clock update is in progress 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline unsigned char rtc_is_updating(void) 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2190b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra unsigned long flags; 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char uip; 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2220b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra spin_lock_irqsave(&rtc_lock, flags); 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); 2240b16f21f144010aa627c58b3a33be49ebfd685dcPeter Zijlstra spin_unlock_irqrestore(&rtc_lock, flags); 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return uip; 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2300f2ed4c6bae23d2b7ef0ea2d272377e3de700c0cThomas Gleixner * A very tiny interrupt handler. It runs with IRQF_DISABLED set, 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but there is possibility of conflicting with the set_rtc_mmss() 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * call (the rtc irq and the timer irq can easily run at the same 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * time in two different CPUs). So we need to serialize 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * accesses to the chip with the rtc_lock spinlock that each 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * architecture should implement in the timer code. 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2399580d85f9cdb076c4bfb467bc6c0d3c5e499957aAdrian Bunkstatic irqreturn_t rtc_interrupt(int irq, void *dev_id) 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Can be an alarm interrupt, update complete interrupt, 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * or a periodic interrupt. We store the status in the 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * low byte and the number of interrupts received since 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the last read in the remainder of rtc_irq_data. 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2485fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock(&rtc_lock); 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data += 0x100; 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data &= ~0xff; 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_hpet_enabled()) { 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * In this case it is HPET RTC interrupt handler 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * calling us, with the interrupt information 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * passed as arg1, instead of irq. 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (unsigned long)irq & 0xF0; 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2655fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock(&rtc_lock); 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now do the rest of the actions */ 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback) 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback->func(rtc_callback->private_data); 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 2725fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar wake_up_interruptible(&rtc_wait); 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2745fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * sysctl-tuning infrastructure. 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table rtc_table[] = { 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "max-user-freq", 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .data = &rtc_max_user_freq, 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .maxlen = sizeof(int), 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0644, 2896d4561110a3e9fa742aeec6717248a491dfb1878Eric W. Biederman .proc_handler = proc_dointvec, 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 291894d2491153a9f8270dbed21175d06fde4eba6c7Eric W. Biederman { } 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table rtc_root[] = { 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "rtc", 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0555, 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .child = rtc_table, 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 300894d2491153a9f8270dbed21175d06fde4eba6c7Eric W. Biederman { } 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ctl_table dev_root[] = { 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .procname = "dev", 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mode = 0555, 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .child = rtc_root, 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 309894d2491153a9f8270dbed21175d06fde4eba6c7Eric W. Biederman { } 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct ctl_table_header *sysctl_header; 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init init_sysctl(void) 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3160b4d414714f0d2f922d39424b0c5c82ad900a381Eric W. Biederman sysctl_header = register_sysctl_table(dev_root); 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit cleanup_sysctl(void) 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_sysctl_table(sysctl_header); 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Now all the various file operations that we export. 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t rtc_read(struct file *file, char __user *buf, 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count, loff_t *ppos) 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DECLARE_WAITQUEUE(wait, current); 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long data; 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ssize_t retval; 3385fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 34238e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki /* 34338e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * Historically this function used to assume that sizeof(unsigned long) 34438e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * is the same in userspace and kernelspace. This lead to problems 34538e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * for configurations with multiple ABIs such a the MIPS o32 and 64 34638e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * ABIs supported on the same kernel. So now we support read of both 34738e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the 34838e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki * userspace ABI. 34938e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki */ 35038e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (count != sizeof(unsigned int) && count != sizeof(unsigned long)) 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds add_wait_queue(&rtc_wait, &wait); 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* First make it right. Then make it fast. Putting this whole 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * block within the parentheses of a while would be too 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * confusing. And no, xchg() is not the answer. */ 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds __set_current_state(TASK_INTERRUPTIBLE); 3615fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 3625fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds data = rtc_irq_data; 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 3655fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (data != 0) 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (file->f_flags & O_NONBLOCK) { 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -EAGAIN; 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (signal_pending(current)) { 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -ERESTARTSYS; 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds schedule(); 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while (1); 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3815fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (count == sizeof(unsigned int)) { 3825fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar retval = put_user(data, 3835fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (unsigned int __user *)buf) ?: sizeof(int); 3845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar } else { 3855fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar retval = put_user(data, 3865fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (unsigned long __user *)buf) ?: sizeof(long); 3875fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar } 38838e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (!retval) 38938e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki retval = count; 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 391cc0a8fbb7ce00f65dc337dd91389b7151f44ed30Milind Arun Choudhary __set_current_state(TASK_RUNNING); 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds remove_wait_queue(&rtc_wait, &wait); 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return retval; 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4005fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar struct rtc_time wtime; 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) { 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (cmd) { 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_OFF: 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_ON: 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_OFF: 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_ON: 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_OFF: 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_ON: 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_READ: 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_SET: 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }; 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (cmd) { 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mask_rtc_irq_bit(RTC_AIE); 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_AIE_ON: /* Allow alarm interrupts. */ 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_rtc_irq_bit(RTC_AIE); 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4325fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 4335fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 4345fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4355fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irqsave(&rtc_lock, flags); 436c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai mask_rtc_irq_bit_locked(RTC_PIE); 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4415fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 4425fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_PIE_ON: /* Allow periodic ints */ 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4475fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 4485fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 4495fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We don't really want Joe User enabling more 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * than 64Hz of interrupts on a multi-user machine. 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!kernel && (rtc_freq > rtc_max_user_freq) && 4555fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (!capable(CAP_SYS_RESOURCE))) 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4585fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irqsave(&rtc_lock, flags); 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(rtc_status & RTC_TIMER_ON)) { 46040565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 46140565f1962c5be9b9e285e05af01ab7771534868Jiri Slaby 2*HZ/100); 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_TIMER_ON; 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 464c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai set_rtc_irq_bit_locked(RTC_PIE); 4655fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 4665fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_OFF: /* Mask ints from RTC updates. */ 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mask_rtc_irq_bit(RTC_UIE); 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_UIE_ON: /* Allow ints for RTC updates. */ 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_rtc_irq_bit(RTC_UIE); 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_ALM_READ: /* Read the present alarm time */ 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This returns a struct rtc_time. Reading >= 0xc0 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * means "don't care" or "match all". Only the tm_hour, 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * tm_min, and tm_sec values are filled in. 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(&wtime, 0, sizeof(struct rtc_time)); 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_rtc_alm_time(&wtime); 4895fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar break; 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_ALM_SET: /* Store a time into the alarm */ 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This expects a struct rtc_time. Writing 0xff means 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * "don't care" or "match all". Only the tm_hour, 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * tm_min and tm_sec are used. 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char hrs, min, sec; 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time alm_tm; 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sizeof(struct rtc_time))) 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hrs = alm_tm.tm_hour; 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = alm_tm.tm_min; 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = alm_tm.tm_sec; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (hpet_set_alarm_time(hrs, min, sec)) { 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Fallthru and set alarm time in CMOS too, 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * so that we will get proper value in RTC_ALM_READ 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || 5175fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar RTC_ALWAYS_BCD) { 5185fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (sec < 60) 519357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk sec = bin2bcd(sec); 5205fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5215fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar sec = 0xff; 5225fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5235fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (min < 60) 524357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk min = bin2bcd(min); 5255fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5265fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar min = 0xff; 5275fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5285fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (hrs < 24) 529357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk hrs = bin2bcd(hrs); 5305fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar else 5315fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar hrs = 0xff; 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(hrs, RTC_HOURS_ALARM); 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(min, RTC_MINUTES_ALARM); 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(sec, RTC_SECONDS_ALARM); 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_RD_TIME: /* Read the time/date from RTC */ 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(&wtime, 0, sizeof(struct rtc_time)); 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_get_rtc_time(&wtime); 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_SET_TIME: /* Set the RTC */ 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time rtc_tm; 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char mon, day, hrs, min, sec, leap_yr; 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char save_control, save_freq_select; 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int yrs; 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int real_yrs; 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!capable(CAP_SYS_TIME)) 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sizeof(struct rtc_time))) 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = rtc_tm.tm_year + 1900; 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds day = rtc_tm.tm_mday; 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hrs = rtc_tm.tm_hour; 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = rtc_tm.tm_min; 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = rtc_tm.tm_sec; 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs < 1970) 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((mon > 12) || (day == 0)) 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5805fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((hrs >= 24) || (min >= 60) || (sec >= 60)) 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar yrs -= epoch; 5855fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (yrs > 255) /* They are unsigned */ 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_yrs = yrs; 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = 72; 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We want to keep the year set to 73 until March 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for non-leap years, so that Feb, 29th is handled 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * correctly. 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!leap_yr && mon < 3) { 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_yrs--; 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs = 73; 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* These limits and adjustments are independent of 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * whether the chip is in binary mode or not. 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs > 169) { 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (yrs >= 100) 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds yrs -= 100; 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds || RTC_ALWAYS_BCD) { 615357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk sec = bin2bcd(sec); 616357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk min = bin2bcd(min); 617357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk hrs = bin2bcd(hrs); 618357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk day = bin2bcd(day); 619357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk mon = bin2bcd(mon); 620357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk yrs = bin2bcd(yrs); 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds save_control = CMOS_READ(RTC_CONTROL); 6241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds save_freq_select = CMOS_READ(RTC_FREQ_SELECT); 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(real_yrs, RTC_DEC_YEAR); 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(yrs, RTC_YEAR); 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(mon, RTC_MONTH); 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(day, RTC_DAY_OF_MONTH); 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(hrs, RTC_HOURS); 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(min, RTC_MINUTES); 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(sec, RTC_SECONDS); 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(save_control, RTC_CONTROL); 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return put_user(rtc_freq, (unsigned long __user *)arg); 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_IRQP_SET: /* Set periodic IRQ rate. */ 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int tmp = 0; 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 6535fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* can be called from isr via rtc_control() */ 6545fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar unsigned long flags; 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6565fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The max we can do is 8192Hz. 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((arg < 2) || (arg > 8192)) 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We don't really want Joe User generating more 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * than 64Hz of interrupts on a multi-user machine. 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6655fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!kernel && (arg > rtc_max_user_freq) && 6665fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar !capable(CAP_SYS_RESOURCE)) 6671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 6681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (arg > (1<<tmp)) 6701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp++; 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check that the input was really a power of 2. 6741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (arg != (1<<tmp)) 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 67861ca9daa2ca3022dc9cb22bd98e69c1b61e412adPaul Gortmaker rtc_freq = arg; 67961ca9daa2ca3022dc9cb22bd98e69c1b61e412adPaul Gortmaker 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 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val |= (16 - tmp); 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_FREQ_SELECT); 689c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_lock, flags); 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_EPOCH_READ: /* Read the epoch. */ 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6955fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return put_user(epoch, (unsigned long __user *)arg); 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case RTC_EPOCH_SET: /* Set the epoch. */ 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 6995fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 7001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * There were no RTC clocks before 1900. 7011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (arg < 1900) 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!capable(CAP_SYS_TIME)) 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EACCES; 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = arg; 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOTTY; 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7145fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return copy_to_user((void __user *)arg, 7155fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar &wtime, sizeof wtime) ? -EFAULT : 0; 7161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 71853f1b1433da7eac2607a4a0898a221a4485fd732Alan Coxstatic long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 7191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 72053f1b1433da7eac2607a4a0898a221a4485fd732Alan Cox long ret; 72153f1b1433da7eac2607a4a0898a221a4485fd732Alan Cox ret = rtc_do_ioctl(cmd, arg, 0); 72253f1b1433da7eac2607a4a0898a221a4485fd732Alan Cox return ret; 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 Torvaldsstatic int rtc_open(struct inode *inode, struct file *file) 7311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7325fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7345fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (rtc_status & RTC_IS_OPEN) 7351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_busy; 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_IS_OPEN; 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 7405fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsout_busy: 7445fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 7461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7485fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic int rtc_fasync(int fd, struct file *filp, int on) 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7505fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar return fasync_helper(fd, filp, on, &rtc_async_queue); 7511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_release(struct inode *inode, struct file *file) 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 7561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char tmp; 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq; 7601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Turn off all interrupts once the device is no longer 7631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in use, and clear the data. 7641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 7671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = CMOS_READ(RTC_CONTROL); 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_PIE; 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_AIE; 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_UIE; 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(tmp, RTC_CONTROL); 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 7741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 7761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq: 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7845fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 7851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 7861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_IS_OPEN; 7875fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 7885fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 7931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned int rtc_poll(struct file *file, poll_table *wait) 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long l; 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds poll_wait(file, &rtc_wait, wait); 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8025fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 8031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds l = rtc_irq_data; 8045fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_unlock_irq(&rtc_lock); 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (l != 0) 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return POLLIN | POLLRDNORM; 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_register(rtc_task_t *task) 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 8171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (task == NULL || task->func == NULL) 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 8201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_IS_OPEN) { 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback) { 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status |= RTC_IS_OPEN; 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback = task; 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8375fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_register); 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_unregister(rtc_task_t *task) 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char tmp; 8451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_task_lock); 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback != task) { 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_callback = NULL; 8545fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* disable controls */ 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = CMOS_READ(RTC_CONTROL); 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_PIE; 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_AIE; 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~RTC_UIE; 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(tmp, RTC_CONTROL); 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 8631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) { 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_TIMER_ON; 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_timer(&rtc_irq_timer); 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_status &= ~RTC_IS_OPEN; 8691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_task_lock); 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8745fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_unregister); 8751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef RTC_IRQ 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 8801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 881c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai unsigned long flags; 882c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET) 883c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai return -EINVAL; 884c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_lock_irqsave(&rtc_task_lock, flags); 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_callback != task) { 886c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_task_lock, flags); 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 889c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai spin_unlock_irqrestore(&rtc_task_lock, flags); 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return rtc_do_ioctl(cmd, arg, 1); 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8935fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo MolnarEXPORT_SYMBOL(rtc_control); 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The various file operations we support. 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 89962322d2554d2f9680c8ace7bbf1f97d8fa84ad1aArjan van de Venstatic const struct file_operations rtc_fops = { 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .llseek = no_llseek, 9021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .read = rtc_read, 9031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .poll = rtc_poll, 9051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 90653f1b1433da7eac2607a4a0898a221a4485fd732Alan Cox .unlocked_ioctl = rtc_ioctl, 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .open = rtc_open, 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .release = rtc_release, 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .fasync = rtc_fasync, 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct miscdevice rtc_dev = { 9131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .minor = RTC_MINOR, 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "rtc", 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .fops = &rtc_fops, 9161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9189cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 91962322d2554d2f9680c8ace7bbf1f97d8fa84ad1aArjan van de Venstatic const struct file_operations rtc_proc_fops = { 9205fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .owner = THIS_MODULE, 9215fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .open = rtc_proc_open, 9225fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .read = seq_read, 9235fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .llseek = seq_lseek, 9245fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar .release = single_release, 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9289626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaasstatic resource_size_t rtc_size; 9299626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9309626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaasstatic struct resource * __init rtc_request_region(resource_size_t size) 9319626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas{ 9329626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas struct resource *r; 9339626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9349626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (RTC_IOMAPPED) 9359626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = request_region(RTC_PORT(0), size, "rtc"); 9369626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas else 9379626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = request_mem_region(RTC_PORT(0), size, "rtc"); 9389626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9399626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (r) 9409626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas rtc_size = size; 9419626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9429626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas return r; 9439626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas} 9449626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 9454c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaasstatic void rtc_release_region(void) 9464c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas{ 9474c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas if (RTC_IOMAPPED) 9489626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas release_region(RTC_PORT(0), rtc_size); 9494c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas else 9509626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas release_mem_region(RTC_PORT(0), rtc_size); 9514c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas} 9524c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas 9531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init rtc_init(void) 9541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9559cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 9561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct proc_dir_entry *ent; 9579cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 9581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__alpha__) || defined(__mips__) 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int year, ctrl; 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *guess = NULL; 9611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 962cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 96375081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller struct device_node *ebus_dp; 9642dc11581376829303b98eadb2de253bee065a56aGrant Likely struct platform_device *op; 9659cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#else 96638e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki void *r; 9679cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef RTC_IRQ 9689cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich irq_handler_t rtc_int_handler_ptr; 9699cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 97038e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki#endif 9711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 972cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 97375081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller for_each_node_by_name(ebus_dp, "ebus") { 97475081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller struct device_node *dp; 97575081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller for (dp = ebus_dp; dp; dp = dp->sibling) { 97675081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller if (!strcmp(dp->name, "rtc")) { 97775081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller op = of_find_device_by_node(dp); 97875081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller if (op) { 97975081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller rtc_port = op->resource[0].start; 98075081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller rtc_irq = op->irqs[0]; 98175081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller goto found; 98275081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller } 9831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 986f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc_init: no PC rtc found\n"); 9881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsfound: 99175081322c9d0d56f8880178f9fcc93778bcf0220David S. Miller if (!rtc_irq) { 9921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_has_irq = 0; 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq; 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 9971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * XXX Interrupt pin #7 in Espresso is shared between RTC and 99853d0fc27af3a3ab22c0ffb67857adfa18977e681David S. Miller * PCI Slot 2 INTA# (and some INTx# in Slot 1). 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10005fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", 10015fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar (void *)&rtc_port)) { 1002f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); 10041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq: 10071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 10089626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = rtc_request_region(RTC_IO_EXTENT); 10099626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas 10109626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas /* 10119626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * If we've already requested a smaller range (for example, because 10129626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * PNPBIOS or ACPI told us how the device is configured), the request 10139626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * above might fail because it's too big. 10149626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * 10159626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas * If so, request just the range we actually use. 10169626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas */ 10179626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas if (!r) 10189626f1f117be21b6e4b7a1cb49814fc065dd3d2dBjorn Helgaas r = rtc_request_region(RTC_IO_EXTENT_USED); 101938e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki if (!r) { 1020f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich#ifdef RTC_IRQ 1021f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 1022f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich#endif 102338e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki printk(KERN_ERR "rtc: I/O resource %lx is not free.\n", 102438e0e8c0550eaed1af48ec5ad9ddb8a25e8b04aeMaciej W. Rozycki (long)(RTC_PORT(0))); 10251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_hpet_enabled()) { 1030f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle int err; 1031f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_int_handler_ptr = hpet_rtc_interrupt; 1033f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle err = hpet_register_irq_handler(rtc_interrupt); 1034f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle if (err != 0) { 1035f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle printk(KERN_WARNING "hpet_register_irq_handler failed " 1036f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle "in rtc_init()."); 1037f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle return err; 1038f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle } 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 10401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_int_handler_ptr = rtc_interrupt; 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10435fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, 10445fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar "rtc", NULL)) { 10451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ 1046f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); 10484c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 10495fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 10511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hpet_rtc_timer_init(); 10531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1056cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#endif /* CONFIG_SPARC32 vs. others */ 10571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (misc_register(&rtc_dev)) { 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_irq(RTC_IRQ, NULL); 1061f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle hpet_unregister_irq_handler(rtc_interrupt); 1062f3e92d355e1251fb6d1a15508f2a5448d2354727Jan Beulich rtc_has_irq = 0; 10631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10644c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 10651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENODEV; 10661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10689cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 10691b50221738108c438d5f25c7a043fb89e9e27044Denis V. Lunev ent = proc_create("driver/rtc", 0, NULL, &rtc_proc_fops); 10701b50221738108c438d5f25c7a043fb89e9e27044Denis V. Lunev if (!ent) 10719cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich printk(KERN_WARNING "rtc: Failed to register with procfs.\n"); 10721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 10731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__alpha__) || defined(__mips__) 10751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_freq = HZ; 10765fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Each operating system on an Alpha uses its own epoch. 10781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Let's try to guess which one we are using now. */ 10795fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_is_updating() != 0) 108147f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna msleep(20); 10825fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 10841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year = CMOS_READ(RTC_YEAR); 10851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 10861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 10875fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) 1089357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk year = bcd2bin(year); /* This should never happen... */ 10905fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar 10911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (year < 20) { 10921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 2000; 10931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "SRM (post-2000)"; 10941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 20 && year < 48) { 10951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1980; 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "ARC console"; 10971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 48 && year < 72) { 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1952; 10991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Digital UNIX"; 11001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if defined(__mips__) 11011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 72 && year < 74) { 11021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 2000; 11031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Digital DECstation"; 11041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (year >= 70) { 11061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds epoch = 1900; 11071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds guess = "Standard PC (1900)"; 11081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (guess) 11115fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", 11125fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar guess, epoch); 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 11151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq == 0) 11161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto no_irq2; 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_freq = 1024; 11201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!hpet_set_periodic_freq(rtc_freq)) { 11215fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar /* 11225fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * Initialize periodic frequency to CMOS reset default, 11235fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * which is 1024Hz 11245fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar */ 11255fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), 11265fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar RTC_FREQ_SELECT); 11271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 11291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsno_irq2: 11301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (void) init_sysctl(); 11331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); 11351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11395fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnarstatic void __exit rtc_exit(void) 11401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cleanup_sysctl(); 11425fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar remove_proc_entry("driver/rtc", NULL); 11431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds misc_deregister(&rtc_dev); 11441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1145cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#ifdef CONFIG_SPARC32 11461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_has_irq) 11475fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar free_irq(rtc_irq, &rtc_port); 11481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11494c06be10c790008aa2b2d19df2872ff39990b7bdBjorn Helgaas rtc_release_region(); 11501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 1151f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle if (rtc_has_irq) { 11525fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar free_irq(RTC_IRQ, NULL); 1153f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle hpet_unregister_irq_handler(hpet_rtc_interrupt); 1154f8f76481bc2803aea03ff213c7e1405b53f7e488Bernhard Walle } 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 1156cdee99d7461d928815db6219fb14d37f99241d44David S. Miller#endif /* CONFIG_SPARC32 */ 11571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(rtc_init); 11601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(rtc_exit); 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 11645fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * At IRQ rates >= 4096Hz, an interrupt may get lost altogether. 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (usually during an IDE disk interrupt, with IRQ unmasking off) 11661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Since the interrupt handler doesn't get called, the IRQ status 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * byte doesn't get read, and the RTC stops generating interrupts. 11681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A timer is set, and will call this function if/when that happens. 11691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * To get it out of this stalled state, we just read the status. 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. 11715fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * (You *really* shouldn't be trying to use a non-realtime system 11721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for something that requires a steady > 1KHz signal anyways.) 11731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 11741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void rtc_dropped_irq(unsigned long data) 11761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long freq; 11781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11795fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar spin_lock_irq(&rtc_lock); 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (hpet_rtc_dropped_irq()) { 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 11841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Just in case someone disabled the timer from behind our back... */ 11871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rtc_status & RTC_TIMER_ON) 11881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); 11891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data += ((rtc_freq/HZ)<<8); 11911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data &= ~0xff; 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq = rtc_freq; 11951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 11971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1198a28ee477e5e5e183fa0289841fd90f350a6e0415Christian Dietrich printk_ratelimited(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", 1199a28ee477e5e5e183fa0289841fd90f350a6e0415Christian Dietrich freq); 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now we have new data */ 12021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wake_up_interruptible(&rtc_wait); 12031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12045fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); 12051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 12071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12089cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#ifdef CONFIG_PROC_FS 12091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 12101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Info exported via "/proc/driver/rtc". 12111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_show(struct seq_file *seq, void *v) 12141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define YN(bit) ((ctrl & bit) ? "yes" : "no") 12161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define NY(bit) ((ctrl & bit) ? "no" : "yes") 12171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtc_time tm; 12181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char batt, ctrl; 12191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long freq; 12201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 12221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds batt = CMOS_READ(RTC_VALID) & RTC_VRT; 12231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 12241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq = rtc_freq; 12251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 12261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_get_rtc_time(&tm); 12291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * There is no way to tell if the luser has the RTC set for local 12321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * time or for Universal Standard Time (GMT). Probably local though. 12331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, 12351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_time\t: %02d:%02d:%02d\n" 12361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_date\t: %04d-%02d-%02d\n" 12371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "rtc_epoch\t: %04lu\n", 12381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tm.tm_hour, tm.tm_min, tm.tm_sec, 12391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); 12401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_rtc_alm_time(&tm); 12421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 12441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will 12451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * match any value for that particular field. Values that are 12461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * greater than a valid time, but less than 0xc0 shouldn't appear. 12471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "alarm\t\t: "); 12491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_hour <= 24) 12501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d:", tm.tm_hour); 12511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**:"); 12531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_min <= 59) 12551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d:", tm.tm_min); 12561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**:"); 12581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tm.tm_sec <= 59) 12601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, "%02d\n", tm.tm_sec); 12611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 12621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_puts(seq, "**\n"); 12631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds seq_printf(seq, 12651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "DST_enable\t: %s\n" 12661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "BCD\t\t: %s\n" 12671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "24hr\t\t: %s\n" 12681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "square_wave\t: %s\n" 12691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "alarm_IRQ\t: %s\n" 12701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "update_IRQ\t: %s\n" 12711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "periodic_IRQ\t: %s\n" 12721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "periodic_freq\t: %ld\n" 12731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "batt_status\t: %s\n", 12741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_DST_EN), 12751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds NY(RTC_DM_BINARY), 12761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_24H), 12771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_SQWE), 12781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_AIE), 12791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_UIE), 12801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds YN(RTC_PIE), 12811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds freq, 12821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds batt ? "okay" : "dead"); 12831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 12851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef YN 12861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef NY 12871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int rtc_proc_open(struct inode *inode, struct file *file) 12901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return single_open(file, rtc_proc_show, NULL); 12921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12939cef779ec3643e6c846f86a32d8c44daff16a336Jan Beulich#endif 12941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12959580d85f9cdb076c4bfb467bc6c0d3c5e499957aAdrian Bunkstatic void rtc_get_rtc_time(struct rtc_time *rtc_tm) 12961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12970f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar unsigned long uip_watchdog = jiffies, flags; 12981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char ctrl; 12991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int real_year; 13011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * read RTC once any update in progress is done. The update 130547f176fdaf8924bc83fddcf9658f2fd3ef60d573Luca Falavigna * can take just over 2ms. We wait 20ms. There is no need to 13061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. 13071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If you need to know *exactly* when a second has started, enable 13085fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar * periodic update complete interrupts, (via ioctl) and then 13091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * immediately read /dev/rtc which will block until you get the IRQ. 13101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Once the read clears, read the RTC time (again via ioctl). Easy. 13111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1313dca03a51549bc645685fb8a77efa64df531666c3Julia Lawall while (rtc_is_updating() != 0 && 1314dca03a51549bc645685fb8a77efa64df531666c3Julia Lawall time_before(jiffies, uip_watchdog + 2*HZ/100)) 1315403fe5ae57c831968c3dbbaba291ae825a1c5aaaPetr Vandrovec cpu_relax(); 13161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Only the values that we read from the RTC are set. We leave 1319b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * tm_wday, tm_yday and tm_isdst untouched. Note that while the 1320b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is 1321b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox * only updated by the RTC when initially set to a non-zero value. 13221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13230f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar spin_lock_irqsave(&rtc_lock, flags); 13241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); 13251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); 13261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); 13271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); 13281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); 13291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year = CMOS_READ(RTC_YEAR); 1330b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox /* Only set from 2.6.16 onwards */ 1331b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); 1332b7599587faea9403edf4d7f74e80b3c9ea217930Alan Cox 13331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_year = CMOS_READ(RTC_DEC_YEAR); 13351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 13370f74964627e0ece4ac8da0e2cd01906ec322b4feIngo Molnar spin_unlock_irqrestore(&rtc_lock, flags); 13381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13395fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { 1340357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); 1341357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); 1342357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); 1343357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); 1344357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); 1345357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); 1346357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday); 13471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_MACH_DECSTATION 13501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year += real_year - 72; 13511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Account for differences between how the RTC uses the values 13551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and how they are defined in a struct rtc_time; 13561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13575fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar rtc_tm->tm_year += epoch - 1900; 13585fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (rtc_tm->tm_year <= 69) 13591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_year += 100; 13601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_tm->tm_mon--; 13621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void get_rtc_alm_time(struct rtc_time *alm_tm) 13651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char ctrl; 13671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 13691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Only the values that we read from the RTC are set. That 13701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * means only tm_hour, tm_min, and tm_sec. 13711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&rtc_lock); 13731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); 13741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); 13751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); 13761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl = CMOS_READ(RTC_CONTROL); 13771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&rtc_lock); 13781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13795fd1fe9c582e00ca0a98f852cd693dc3caf607a0Ingo Molnar if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { 1380357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); 1381357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk alm_tm->tm_min = bcd2bin(alm_tm->tm_min); 1382357c6e63590895dc87cc9300f5a1c27544ea69e8Adrian Bunk alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); 13831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef RTC_IRQ 13871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 13881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Used to disable/enable interrupts for any one of UIE, AIE, PIE. 13891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Rumour has it that if you frob the interrupt enable/disable 13901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to 13911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ensure you actually start getting interrupts. Probably for 13921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * compatibility with older/broken chipset RTC implementations. 13931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We also clear out any old irq data after an ioctl() that 13941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * meddles with the interrupt enable/disable bits. 13951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 13961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1397c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void mask_rtc_irq_bit_locked(unsigned char bit) 13981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 14001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1401c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (hpet_mask_rtc_irq_bit(bit)) 14021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 14031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_CONTROL); 14041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val &= ~bit; 14051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_CONTROL); 14061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 14071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 14091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1411c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwaistatic void set_rtc_irq_bit_locked(unsigned char bit) 14121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 14131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char val; 14141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1415c3348760aaffd268f7e91b2185999025fdc5607fTakashi Iwai if (hpet_set_rtc_irq_bit(bit)) 14161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 14171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val = CMOS_READ(RTC_CONTROL); 14181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds val |= bit; 14191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_WRITE(val, RTC_CONTROL); 14201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds CMOS_READ(RTC_INTR_FLAGS); 14211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_irq_data = 0; 14231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 14251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Paul Gortmaker"); 14271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 14281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_ALIAS_MISCDEV(RTC_MINOR); 1429