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drivers/char/rtc.c
33.5 KB
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/* |
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* Real Time Clock interface for Linux |
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* * Copyright (C) 1996 Paul Gortmaker * * This driver allows use of the real time clock (built into * nearly all computers) from user space. It exports the /dev/rtc * interface supporting various ioctl() and also the * /proc/driver/rtc pseudo-file for status information. * * The ioctls can be used to set the interrupt behaviour and * generation rate from the RTC via IRQ 8. Then the /dev/rtc * interface can be used to make use of these timer interrupts, * be they interval or alarm based. * * The /dev/rtc interface will block on reads until an interrupt * has been received. If a RTC interrupt has already happened, * it will output an unsigned long and then block. The output value * contains the interrupt status in the low byte and the number of |
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* interrupts since the last read in the remaining high bytes. The |
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* /dev/rtc interface can also be used with the select(2) call. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Based on other minimal char device drivers, like Alan's * watchdog, Ted's random, etc. etc. * * 1.07 Paul Gortmaker. * 1.08 Miquel van Smoorenburg: disallow certain things on the * DEC Alpha as the CMOS clock is also used for other things. * 1.09 Nikita Schmidt: epoch support and some Alpha cleanup. * 1.09a Pete Zaitcev: Sun SPARC * 1.09b Jeff Garzik: Modularize, init cleanup * 1.09c Jeff Garzik: SMP cleanup |
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* 1.10 Paul Barton-Davis: add support for async I/O |
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* 1.10a Andrea Arcangeli: Alpha updates * 1.10b Andrew Morton: SMP lock fix * 1.10c Cesar Barros: SMP locking fixes and cleanup * 1.10d Paul Gortmaker: delete paranoia check in rtc_exit * 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness. |
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* 1.11 Takashi Iwai: Kernel access functions |
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* rtc_register/rtc_unregister/rtc_control * 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init * 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer * CONFIG_HPET_EMULATE_RTC |
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* 1.12a Maciej W. Rozycki: Handle memory-mapped chips properly. |
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* 1.12ac Alan Cox: Allow read access to the day of week register |
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* 1.12b David John: Remove calls to the BKL. |
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*/ |
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#define RTC_VERSION "1.12b" |
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/* * Note that *all* calls to CMOS_READ and CMOS_WRITE are done with * interrupts disabled. Due to the index-port/data-port (0x70/0x71) * design of the RTC, we don't want two different things trying to * get to it at once. (e.g. the periodic 11 min sync from time.c vs. * this driver.) */ |
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#include <linux/interrupt.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/miscdevice.h> #include <linux/ioport.h> #include <linux/fcntl.h> #include <linux/mc146818rtc.h> #include <linux/init.h> #include <linux/poll.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/spinlock.h> |
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#include <linux/sched.h> |
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#include <linux/sysctl.h> #include <linux/wait.h> #include <linux/bcd.h> |
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#include <linux/delay.h> |
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#include <linux/uaccess.h> |
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#include <asm/current.h> |
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#include <asm/system.h> |
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#ifdef CONFIG_X86 |
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#include <asm/hpet.h> #endif |
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#ifdef CONFIG_SPARC32 |
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#include <linux/of.h> #include <linux/of_device.h> #include <asm/io.h> |
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static unsigned long rtc_port; |
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static int rtc_irq; |
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#endif |
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#ifdef CONFIG_HPET_EMULATE_RTC |
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#undef RTC_IRQ #endif #ifdef RTC_IRQ static int rtc_has_irq = 1; #endif #ifndef CONFIG_HPET_EMULATE_RTC #define is_hpet_enabled() 0 |
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#define hpet_set_alarm_time(hrs, min, sec) 0 #define hpet_set_periodic_freq(arg) 0 #define hpet_mask_rtc_irq_bit(arg) 0 #define hpet_set_rtc_irq_bit(arg) 0 #define hpet_rtc_timer_init() do { } while (0) #define hpet_rtc_dropped_irq() 0 |
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#define hpet_register_irq_handler(h) ({ 0; }) #define hpet_unregister_irq_handler(h) ({ 0; }) |
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#ifdef RTC_IRQ static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) { return 0; } #endif |
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#endif /* * We sponge a minor off of the misc major. No need slurping * up another valuable major dev number for this. If you add * an ioctl, make sure you don't conflict with SPARC's RTC * ioctls. */ static struct fasync_struct *rtc_async_queue; static DECLARE_WAIT_QUEUE_HEAD(rtc_wait); #ifdef RTC_IRQ |
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static void rtc_dropped_irq(unsigned long data); static DEFINE_TIMER(rtc_irq_timer, rtc_dropped_irq, 0, 0); |
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#endif static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); |
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static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
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static void rtc_get_rtc_time(struct rtc_time *rtc_tm); |
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#ifdef RTC_IRQ static unsigned int rtc_poll(struct file *file, poll_table *wait); #endif |
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static void get_rtc_alm_time(struct rtc_time *alm_tm); |
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#ifdef RTC_IRQ |
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static void set_rtc_irq_bit_locked(unsigned char bit); static void mask_rtc_irq_bit_locked(unsigned char bit); static inline void set_rtc_irq_bit(unsigned char bit) { spin_lock_irq(&rtc_lock); set_rtc_irq_bit_locked(bit); spin_unlock_irq(&rtc_lock); } static void mask_rtc_irq_bit(unsigned char bit) { spin_lock_irq(&rtc_lock); mask_rtc_irq_bit_locked(bit); spin_unlock_irq(&rtc_lock); } |
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#endif |
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#ifdef CONFIG_PROC_FS |
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static int rtc_proc_open(struct inode *inode, struct file *file); |
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#endif |
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/* * Bits in rtc_status. (6 bits of room for future expansion) */ #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ #define RTC_TIMER_ON 0x02 /* missed irq timer active */ /* * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is |
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* protected by the spin lock rtc_lock. However, ioctl can still disable the * timer in rtc_status and then with del_timer after the interrupt has read |
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* rtc_status but before mod_timer is called, which would then reenable the * timer (but you would need to have an awful timing before you'd trip on it) */ |
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static unsigned long rtc_status; /* bitmapped status byte. */ static unsigned long rtc_freq; /* Current periodic IRQ rate */ static unsigned long rtc_irq_data; /* our output to the world */ |
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static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ #ifdef RTC_IRQ /* * rtc_task_lock nests inside rtc_lock. */ static DEFINE_SPINLOCK(rtc_task_lock); |
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static rtc_task_t *rtc_callback; |
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#endif /* * If this driver ever becomes modularised, it will be really nice * to make the epoch retain its value across module reload... */ static unsigned long epoch = 1900; /* year corresponding to 0x00 */ |
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static const unsigned char days_in_mo[] = |
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{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; /* * Returns true if a clock update is in progress */ static inline unsigned char rtc_is_updating(void) { |
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unsigned long flags; |
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unsigned char uip; |
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spin_lock_irqsave(&rtc_lock, flags); |
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uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return uip; } #ifdef RTC_IRQ /* |
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* A very tiny interrupt handler. It runs with IRQF_DISABLED set, |
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* but there is possibility of conflicting with the set_rtc_mmss() * call (the rtc irq and the timer irq can easily run at the same * time in two different CPUs). So we need to serialize * accesses to the chip with the rtc_lock spinlock that each * architecture should implement in the timer code. * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) */ |
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static irqreturn_t rtc_interrupt(int irq, void *dev_id) |
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{ /* * Can be an alarm interrupt, update complete interrupt, * or a periodic interrupt. We store the status in the * low byte and the number of interrupts received since * the last read in the remainder of rtc_irq_data. */ |
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spin_lock(&rtc_lock); |
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rtc_irq_data += 0x100; rtc_irq_data &= ~0xff; if (is_hpet_enabled()) { /* * In this case it is HPET RTC interrupt handler * calling us, with the interrupt information * passed as arg1, instead of irq. */ rtc_irq_data |= (unsigned long)irq & 0xF0; } else { rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); } if (rtc_status & RTC_TIMER_ON) mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); |
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spin_unlock(&rtc_lock); |
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/* Now do the rest of the actions */ spin_lock(&rtc_task_lock); if (rtc_callback) rtc_callback->func(rtc_callback->private_data); spin_unlock(&rtc_task_lock); |
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wake_up_interruptible(&rtc_wait); |
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kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); |
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return IRQ_HANDLED; } #endif /* * sysctl-tuning infrastructure. */ static ctl_table rtc_table[] = { { |
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.procname = "max-user-freq", .data = &rtc_max_user_freq, .maxlen = sizeof(int), .mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ } |
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}; static ctl_table rtc_root[] = { { |
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.procname = "rtc", |
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.mode = 0555, .child = rtc_table, }, |
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{ } |
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}; static ctl_table dev_root[] = { { |
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.procname = "dev", |
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.mode = 0555, .child = rtc_root, }, |
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{ } |
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}; static struct ctl_table_header *sysctl_header; static int __init init_sysctl(void) { |
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sysctl_header = register_sysctl_table(dev_root); |
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return 0; } static void __exit cleanup_sysctl(void) { unregister_sysctl_table(sysctl_header); } /* * Now all the various file operations that we export. */ static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { #ifndef RTC_IRQ return -EIO; #else DECLARE_WAITQUEUE(wait, current); unsigned long data; ssize_t retval; |
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if (rtc_has_irq == 0) return -EIO; |
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/* * Historically this function used to assume that sizeof(unsigned long) * is the same in userspace and kernelspace. This lead to problems * for configurations with multiple ABIs such a the MIPS o32 and 64 * ABIs supported on the same kernel. So now we support read of both * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the * userspace ABI. */ if (count != sizeof(unsigned int) && count != sizeof(unsigned long)) |
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return -EINVAL; add_wait_queue(&rtc_wait, &wait); do { /* First make it right. Then make it fast. Putting this whole * block within the parentheses of a while would be too * confusing. And no, xchg() is not the answer. */ __set_current_state(TASK_INTERRUPTIBLE); |
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spin_lock_irq(&rtc_lock); |
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data = rtc_irq_data; rtc_irq_data = 0; |
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spin_unlock_irq(&rtc_lock); |
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if (data != 0) break; if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; goto out; } if (signal_pending(current)) { retval = -ERESTARTSYS; goto out; } schedule(); } while (1); |
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if (count == sizeof(unsigned int)) { retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); } else { retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long); } |
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if (!retval) retval = count; |
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out: |
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__set_current_state(TASK_RUNNING); |
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remove_wait_queue(&rtc_wait, &wait); return retval; #endif } static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) { |
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struct rtc_time wtime; |
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#ifdef RTC_IRQ if (rtc_has_irq == 0) { switch (cmd) { case RTC_AIE_OFF: case RTC_AIE_ON: case RTC_PIE_OFF: case RTC_PIE_ON: case RTC_UIE_OFF: case RTC_UIE_ON: case RTC_IRQP_READ: case RTC_IRQP_SET: return -EINVAL; }; } #endif switch (cmd) { #ifdef RTC_IRQ case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ { mask_rtc_irq_bit(RTC_AIE); return 0; } case RTC_AIE_ON: /* Allow alarm interrupts. */ { set_rtc_irq_bit(RTC_AIE); return 0; } case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ { |
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/* can be called from isr via rtc_control() */ unsigned long flags; spin_lock_irqsave(&rtc_lock, flags); |
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mask_rtc_irq_bit_locked(RTC_PIE); |
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if (rtc_status & RTC_TIMER_ON) { |
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rtc_status &= ~RTC_TIMER_ON; del_timer(&rtc_irq_timer); |
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} |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return 0; } case RTC_PIE_ON: /* Allow periodic ints */ { |
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/* can be called from isr via rtc_control() */ unsigned long flags; |
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/* * We don't really want Joe User enabling more * than 64Hz of interrupts on a multi-user machine. */ if (!kernel && (rtc_freq > rtc_max_user_freq) && |
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(!capable(CAP_SYS_RESOURCE))) |
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return -EACCES; |
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spin_lock_irqsave(&rtc_lock, flags); |
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if (!(rtc_status & RTC_TIMER_ON)) { |
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mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); |
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rtc_status |= RTC_TIMER_ON; |
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} |
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set_rtc_irq_bit_locked(RTC_PIE); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return 0; } case RTC_UIE_OFF: /* Mask ints from RTC updates. */ { mask_rtc_irq_bit(RTC_UIE); return 0; } case RTC_UIE_ON: /* Allow ints for RTC updates. */ { set_rtc_irq_bit(RTC_UIE); return 0; } #endif case RTC_ALM_READ: /* Read the present alarm time */ { /* * This returns a struct rtc_time. Reading >= 0xc0 * means "don't care" or "match all". Only the tm_hour, * tm_min, and tm_sec values are filled in. */ memset(&wtime, 0, sizeof(struct rtc_time)); get_rtc_alm_time(&wtime); |
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break; |
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} case RTC_ALM_SET: /* Store a time into the alarm */ { /* * This expects a struct rtc_time. Writing 0xff means * "don't care" or "match all". Only the tm_hour, * tm_min and tm_sec are used. */ unsigned char hrs, min, sec; struct rtc_time alm_tm; if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, sizeof(struct rtc_time))) return -EFAULT; hrs = alm_tm.tm_hour; min = alm_tm.tm_min; sec = alm_tm.tm_sec; spin_lock_irq(&rtc_lock); if (hpet_set_alarm_time(hrs, min, sec)) { /* * Fallthru and set alarm time in CMOS too, * so that we will get proper value in RTC_ALM_READ */ } if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || |
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RTC_ALWAYS_BCD) { if (sec < 60) |
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sec = bin2bcd(sec); |
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else sec = 0xff; if (min < 60) |
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min = bin2bcd(min); |
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else min = 0xff; if (hrs < 24) |
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hrs = bin2bcd(hrs); |
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else hrs = 0xff; |
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} CMOS_WRITE(hrs, RTC_HOURS_ALARM); CMOS_WRITE(min, RTC_MINUTES_ALARM); CMOS_WRITE(sec, RTC_SECONDS_ALARM); spin_unlock_irq(&rtc_lock); return 0; } case RTC_RD_TIME: /* Read the time/date from RTC */ { memset(&wtime, 0, sizeof(struct rtc_time)); rtc_get_rtc_time(&wtime); break; } case RTC_SET_TIME: /* Set the RTC */ { struct rtc_time rtc_tm; unsigned char mon, day, hrs, min, sec, leap_yr; unsigned char save_control, save_freq_select; unsigned int yrs; #ifdef CONFIG_MACH_DECSTATION unsigned int real_yrs; #endif if (!capable(CAP_SYS_TIME)) return -EACCES; if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, sizeof(struct rtc_time))) return -EFAULT; yrs = rtc_tm.tm_year + 1900; mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ day = rtc_tm.tm_mday; hrs = rtc_tm.tm_hour; min = rtc_tm.tm_min; sec = rtc_tm.tm_sec; if (yrs < 1970) return -EINVAL; leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); if ((mon > 12) || (day == 0)) return -EINVAL; if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) return -EINVAL; |
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if ((hrs >= 24) || (min >= 60) || (sec >= 60)) return -EINVAL; |
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yrs -= epoch; if (yrs > 255) /* They are unsigned */ |
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return -EINVAL; spin_lock_irq(&rtc_lock); #ifdef CONFIG_MACH_DECSTATION real_yrs = yrs; yrs = 72; /* * We want to keep the year set to 73 until March * for non-leap years, so that Feb, 29th is handled * correctly. */ if (!leap_yr && mon < 3) { real_yrs--; yrs = 73; } #endif /* These limits and adjustments are independent of * whether the chip is in binary mode or not. */ if (yrs > 169) { spin_unlock_irq(&rtc_lock); return -EINVAL; } if (yrs >= 100) yrs -= 100; if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
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sec = bin2bcd(sec); min = bin2bcd(min); hrs = bin2bcd(hrs); day = bin2bcd(day); mon = bin2bcd(mon); yrs = bin2bcd(yrs); |
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601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 |
} save_control = CMOS_READ(RTC_CONTROL); CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); save_freq_select = CMOS_READ(RTC_FREQ_SELECT); CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); #ifdef CONFIG_MACH_DECSTATION CMOS_WRITE(real_yrs, RTC_DEC_YEAR); #endif CMOS_WRITE(yrs, RTC_YEAR); CMOS_WRITE(mon, RTC_MONTH); CMOS_WRITE(day, RTC_DAY_OF_MONTH); CMOS_WRITE(hrs, RTC_HOURS); CMOS_WRITE(min, RTC_MINUTES); CMOS_WRITE(sec, RTC_SECONDS); CMOS_WRITE(save_control, RTC_CONTROL); CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); spin_unlock_irq(&rtc_lock); return 0; } #ifdef RTC_IRQ case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ { return put_user(rtc_freq, (unsigned long __user *)arg); } case RTC_IRQP_SET: /* Set periodic IRQ rate. */ { int tmp = 0; unsigned char val; |
5fd1fe9c5
|
633 634 |
/* can be called from isr via rtc_control() */ unsigned long flags; |
1da177e4c
|
635 |
|
5fd1fe9c5
|
636 |
/* |
1da177e4c
|
637 638 639 640 641 642 643 644 |
* The max we can do is 8192Hz. */ if ((arg < 2) || (arg > 8192)) return -EINVAL; /* * We don't really want Joe User generating more * than 64Hz of interrupts on a multi-user machine. */ |
5fd1fe9c5
|
645 646 |
if (!kernel && (arg > rtc_max_user_freq) && !capable(CAP_SYS_RESOURCE)) |
1da177e4c
|
647 648 649 650 651 652 653 654 655 656 |
return -EACCES; while (arg > (1<<tmp)) tmp++; /* * Check that the input was really a power of 2. */ if (arg != (1<<tmp)) return -EINVAL; |
61ca9daa2
|
657 |
rtc_freq = arg; |
c3348760a
|
658 |
spin_lock_irqsave(&rtc_lock, flags); |
1da177e4c
|
659 |
if (hpet_set_periodic_freq(arg)) { |
c3348760a
|
660 |
spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4c
|
661 662 |
return 0; } |
1da177e4c
|
663 664 665 666 |
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; val |= (16 - tmp); CMOS_WRITE(val, RTC_FREQ_SELECT); |
c3348760a
|
667 |
spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4c
|
668 669 670 671 672 |
return 0; } #endif case RTC_EPOCH_READ: /* Read the epoch. */ { |
5fd1fe9c5
|
673 |
return put_user(epoch, (unsigned long __user *)arg); |
1da177e4c
|
674 675 676 |
} case RTC_EPOCH_SET: /* Set the epoch. */ { |
5fd1fe9c5
|
677 |
/* |
1da177e4c
|
678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
* There were no RTC clocks before 1900. */ if (arg < 1900) return -EINVAL; if (!capable(CAP_SYS_TIME)) return -EACCES; epoch = arg; return 0; } default: return -ENOTTY; } |
5fd1fe9c5
|
692 693 |
return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; |
1da177e4c
|
694 |
} |
53f1b1433
|
695 |
static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4c
|
696 |
{ |
53f1b1433
|
697 |
long ret; |
53f1b1433
|
698 |
ret = rtc_do_ioctl(cmd, arg, 0); |
53f1b1433
|
699 |
return ret; |
1da177e4c
|
700 701 702 703 704 705 706 |
} /* * We enforce only one user at a time here with the open/close. * Also clear the previous interrupt data on an open, and clean * up things on a close. */ |
1da177e4c
|
707 708 |
static int rtc_open(struct inode *inode, struct file *file) { |
5fd1fe9c5
|
709 |
spin_lock_irq(&rtc_lock); |
1da177e4c
|
710 |
|
5fd1fe9c5
|
711 |
if (rtc_status & RTC_IS_OPEN) |
1da177e4c
|
712 713 714 715 716 |
goto out_busy; rtc_status |= RTC_IS_OPEN; rtc_irq_data = 0; |
5fd1fe9c5
|
717 |
spin_unlock_irq(&rtc_lock); |
1da177e4c
|
718 719 720 |
return 0; out_busy: |
5fd1fe9c5
|
721 |
spin_unlock_irq(&rtc_lock); |
1da177e4c
|
722 723 |
return -EBUSY; } |
5fd1fe9c5
|
724 |
static int rtc_fasync(int fd, struct file *filp, int on) |
1da177e4c
|
725 |
{ |
5fd1fe9c5
|
726 |
return fasync_helper(fd, filp, on, &rtc_async_queue); |
1da177e4c
|
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 |
} static int rtc_release(struct inode *inode, struct file *file) { #ifdef RTC_IRQ unsigned char tmp; if (rtc_has_irq == 0) goto no_irq; /* * Turn off all interrupts once the device is no longer * in use, and clear the data. */ spin_lock_irq(&rtc_lock); if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { tmp = CMOS_READ(RTC_CONTROL); tmp &= ~RTC_PIE; tmp &= ~RTC_AIE; tmp &= ~RTC_UIE; CMOS_WRITE(tmp, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); } if (rtc_status & RTC_TIMER_ON) { rtc_status &= ~RTC_TIMER_ON; del_timer(&rtc_irq_timer); } spin_unlock_irq(&rtc_lock); |
1da177e4c
|
756 757 |
no_irq: #endif |
5fd1fe9c5
|
758 |
spin_lock_irq(&rtc_lock); |
1da177e4c
|
759 760 |
rtc_irq_data = 0; rtc_status &= ~RTC_IS_OPEN; |
5fd1fe9c5
|
761 |
spin_unlock_irq(&rtc_lock); |
1da177e4c
|
762 763 764 765 |
return 0; } #ifdef RTC_IRQ |
1da177e4c
|
766 767 768 769 770 771 772 773 |
static unsigned int rtc_poll(struct file *file, poll_table *wait) { unsigned long l; if (rtc_has_irq == 0) return 0; poll_wait(file, &rtc_wait, wait); |
5fd1fe9c5
|
774 |
spin_lock_irq(&rtc_lock); |
1da177e4c
|
775 |
l = rtc_irq_data; |
5fd1fe9c5
|
776 |
spin_unlock_irq(&rtc_lock); |
1da177e4c
|
777 778 779 780 781 782 |
if (l != 0) return POLLIN | POLLRDNORM; return 0; } #endif |
1da177e4c
|
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 |
int rtc_register(rtc_task_t *task) { #ifndef RTC_IRQ return -EIO; #else if (task == NULL || task->func == NULL) return -EINVAL; spin_lock_irq(&rtc_lock); if (rtc_status & RTC_IS_OPEN) { spin_unlock_irq(&rtc_lock); return -EBUSY; } spin_lock(&rtc_task_lock); if (rtc_callback) { spin_unlock(&rtc_task_lock); spin_unlock_irq(&rtc_lock); return -EBUSY; } rtc_status |= RTC_IS_OPEN; rtc_callback = task; spin_unlock(&rtc_task_lock); spin_unlock_irq(&rtc_lock); return 0; #endif } |
5fd1fe9c5
|
808 |
EXPORT_SYMBOL(rtc_register); |
1da177e4c
|
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 |
int rtc_unregister(rtc_task_t *task) { #ifndef RTC_IRQ return -EIO; #else unsigned char tmp; spin_lock_irq(&rtc_lock); spin_lock(&rtc_task_lock); if (rtc_callback != task) { spin_unlock(&rtc_task_lock); spin_unlock_irq(&rtc_lock); return -ENXIO; } rtc_callback = NULL; |
5fd1fe9c5
|
825 |
|
1da177e4c
|
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 |
/* disable controls */ if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { tmp = CMOS_READ(RTC_CONTROL); tmp &= ~RTC_PIE; tmp &= ~RTC_AIE; tmp &= ~RTC_UIE; CMOS_WRITE(tmp, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); } if (rtc_status & RTC_TIMER_ON) { rtc_status &= ~RTC_TIMER_ON; del_timer(&rtc_irq_timer); } rtc_status &= ~RTC_IS_OPEN; spin_unlock(&rtc_task_lock); spin_unlock_irq(&rtc_lock); return 0; #endif } |
5fd1fe9c5
|
845 |
EXPORT_SYMBOL(rtc_unregister); |
1da177e4c
|
846 847 848 849 850 851 |
int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) { #ifndef RTC_IRQ return -EIO; #else |
c3348760a
|
852 853 854 855 |
unsigned long flags; if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET) return -EINVAL; spin_lock_irqsave(&rtc_task_lock, flags); |
1da177e4c
|
856 |
if (rtc_callback != task) { |
c3348760a
|
857 |
spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4c
|
858 859 |
return -ENXIO; } |
c3348760a
|
860 |
spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4c
|
861 862 863 |
return rtc_do_ioctl(cmd, arg, 1); #endif } |
5fd1fe9c5
|
864 |
EXPORT_SYMBOL(rtc_control); |
1da177e4c
|
865 866 867 868 |
/* * The various file operations we support. */ |
62322d255
|
869 |
static const struct file_operations rtc_fops = { |
1da177e4c
|
870 871 872 873 874 875 |
.owner = THIS_MODULE, .llseek = no_llseek, .read = rtc_read, #ifdef RTC_IRQ .poll = rtc_poll, #endif |
53f1b1433
|
876 |
.unlocked_ioctl = rtc_ioctl, |
1da177e4c
|
877 878 879 880 881 882 883 884 885 886 |
.open = rtc_open, .release = rtc_release, .fasync = rtc_fasync, }; static struct miscdevice rtc_dev = { .minor = RTC_MINOR, .name = "rtc", .fops = &rtc_fops, }; |
9cef779ec
|
887 |
#ifdef CONFIG_PROC_FS |
62322d255
|
888 |
static const struct file_operations rtc_proc_fops = { |
5fd1fe9c5
|
889 890 891 892 893 |
.owner = THIS_MODULE, .open = rtc_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, |
1da177e4c
|
894 |
}; |
1da177e4c
|
895 |
#endif |
9626f1f11
|
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 |
static resource_size_t rtc_size; static struct resource * __init rtc_request_region(resource_size_t size) { struct resource *r; if (RTC_IOMAPPED) r = request_region(RTC_PORT(0), size, "rtc"); else r = request_mem_region(RTC_PORT(0), size, "rtc"); if (r) rtc_size = size; return r; } |
4c06be10c
|
912 913 914 |
static void rtc_release_region(void) { if (RTC_IOMAPPED) |
9626f1f11
|
915 |
release_region(RTC_PORT(0), rtc_size); |
4c06be10c
|
916 |
else |
9626f1f11
|
917 |
release_mem_region(RTC_PORT(0), rtc_size); |
4c06be10c
|
918 |
} |
1da177e4c
|
919 920 |
static int __init rtc_init(void) { |
9cef779ec
|
921 |
#ifdef CONFIG_PROC_FS |
1da177e4c
|
922 |
struct proc_dir_entry *ent; |
9cef779ec
|
923 |
#endif |
1da177e4c
|
924 925 |
#if defined(__alpha__) || defined(__mips__) unsigned int year, ctrl; |
1da177e4c
|
926 927 |
char *guess = NULL; #endif |
cdee99d74
|
928 |
#ifdef CONFIG_SPARC32 |
75081322c
|
929 |
struct device_node *ebus_dp; |
2dc115813
|
930 |
struct platform_device *op; |
9cef779ec
|
931 |
#else |
38e0e8c05
|
932 |
void *r; |
9cef779ec
|
933 934 935 |
#ifdef RTC_IRQ irq_handler_t rtc_int_handler_ptr; #endif |
38e0e8c05
|
936 |
#endif |
1da177e4c
|
937 |
|
cdee99d74
|
938 |
#ifdef CONFIG_SPARC32 |
75081322c
|
939 940 941 942 943 944 945 946 947 948 |
for_each_node_by_name(ebus_dp, "ebus") { struct device_node *dp; for (dp = ebus_dp; dp; dp = dp->sibling) { if (!strcmp(dp->name, "rtc")) { op = of_find_device_by_node(dp); if (op) { rtc_port = op->resource[0].start; rtc_irq = op->irqs[0]; goto found; } |
1da177e4c
|
949 950 951 |
} } } |
f3e92d355
|
952 |
rtc_has_irq = 0; |
1da177e4c
|
953 954 955 956 957 |
printk(KERN_ERR "rtc_init: no PC rtc found "); return -EIO; found: |
75081322c
|
958 |
if (!rtc_irq) { |
1da177e4c
|
959 960 961 962 963 964 |
rtc_has_irq = 0; goto no_irq; } /* * XXX Interrupt pin #7 in Espresso is shared between RTC and |
53d0fc27a
|
965 |
* PCI Slot 2 INTA# (and some INTx# in Slot 1). |
1da177e4c
|
966 |
*/ |
5fd1fe9c5
|
967 968 |
if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) { |
f3e92d355
|
969 |
rtc_has_irq = 0; |
1da177e4c
|
970 971 972 973 974 975 |
printk(KERN_ERR "rtc: cannot register IRQ %d ", rtc_irq); return -EIO; } no_irq: #else |
9626f1f11
|
976 977 978 979 980 981 982 983 984 985 986 |
r = rtc_request_region(RTC_IO_EXTENT); /* * If we've already requested a smaller range (for example, because * PNPBIOS or ACPI told us how the device is configured), the request * above might fail because it's too big. * * If so, request just the range we actually use. */ if (!r) r = rtc_request_region(RTC_IO_EXTENT_USED); |
38e0e8c05
|
987 |
if (!r) { |
f3e92d355
|
988 989 990 |
#ifdef RTC_IRQ rtc_has_irq = 0; #endif |
38e0e8c05
|
991 992 993 |
printk(KERN_ERR "rtc: I/O resource %lx is not free. ", (long)(RTC_PORT(0))); |
1da177e4c
|
994 995 996 997 998 |
return -EIO; } #ifdef RTC_IRQ if (is_hpet_enabled()) { |
f8f76481b
|
999 |
int err; |
1da177e4c
|
1000 |
rtc_int_handler_ptr = hpet_rtc_interrupt; |
f8f76481b
|
1001 1002 1003 1004 1005 1006 |
err = hpet_register_irq_handler(rtc_interrupt); if (err != 0) { printk(KERN_WARNING "hpet_register_irq_handler failed " "in rtc_init()."); return err; } |
1da177e4c
|
1007 1008 1009 |
} else { rtc_int_handler_ptr = rtc_interrupt; } |
5fd1fe9c5
|
1010 1011 |
if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) { |
1da177e4c
|
1012 |
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */ |
f3e92d355
|
1013 |
rtc_has_irq = 0; |
1da177e4c
|
1014 1015 |
printk(KERN_ERR "rtc: IRQ %d is not free. ", RTC_IRQ); |
4c06be10c
|
1016 |
rtc_release_region(); |
5fd1fe9c5
|
1017 |
|
1da177e4c
|
1018 1019 1020 1021 1022 |
return -EIO; } hpet_rtc_timer_init(); #endif |
cdee99d74
|
1023 |
#endif /* CONFIG_SPARC32 vs. others */ |
1da177e4c
|
1024 1025 1026 1027 |
if (misc_register(&rtc_dev)) { #ifdef RTC_IRQ free_irq(RTC_IRQ, NULL); |
f8f76481b
|
1028 |
hpet_unregister_irq_handler(rtc_interrupt); |
f3e92d355
|
1029 |
rtc_has_irq = 0; |
1da177e4c
|
1030 |
#endif |
4c06be10c
|
1031 |
rtc_release_region(); |
1da177e4c
|
1032 1033 |
return -ENODEV; } |
9cef779ec
|
1034 |
#ifdef CONFIG_PROC_FS |
1b5022173
|
1035 1036 |
ent = proc_create("driver/rtc", 0, NULL, &rtc_proc_fops); if (!ent) |
9cef779ec
|
1037 1038 |
printk(KERN_WARNING "rtc: Failed to register with procfs. "); |
1da177e4c
|
1039 |
#endif |
1da177e4c
|
1040 1041 1042 |
#if defined(__alpha__) || defined(__mips__) rtc_freq = HZ; |
5fd1fe9c5
|
1043 |
|
1da177e4c
|
1044 1045 |
/* Each operating system on an Alpha uses its own epoch. Let's try to guess which one we are using now. */ |
5fd1fe9c5
|
1046 |
|
1da177e4c
|
1047 |
if (rtc_is_updating() != 0) |
47f176fda
|
1048 |
msleep(20); |
5fd1fe9c5
|
1049 |
|
1da177e4c
|
1050 1051 1052 1053 |
spin_lock_irq(&rtc_lock); year = CMOS_READ(RTC_YEAR); ctrl = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); |
5fd1fe9c5
|
1054 |
|
1da177e4c
|
1055 |
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) |
357c6e635
|
1056 |
year = bcd2bin(year); /* This should never happen... */ |
5fd1fe9c5
|
1057 |
|
1da177e4c
|
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 |
if (year < 20) { epoch = 2000; guess = "SRM (post-2000)"; } else if (year >= 20 && year < 48) { epoch = 1980; guess = "ARC console"; } else if (year >= 48 && year < 72) { epoch = 1952; guess = "Digital UNIX"; #if defined(__mips__) } else if (year >= 72 && year < 74) { epoch = 2000; guess = "Digital DECstation"; #else } else if (year >= 70) { epoch = 1900; guess = "Standard PC (1900)"; #endif } if (guess) |
5fd1fe9c5
|
1078 1079 1080 |
printk(KERN_INFO "rtc: %s epoch (%lu) detected ", guess, epoch); |
1da177e4c
|
1081 1082 1083 1084 |
#endif #ifdef RTC_IRQ if (rtc_has_irq == 0) goto no_irq2; |
1da177e4c
|
1085 1086 1087 |
spin_lock_irq(&rtc_lock); rtc_freq = 1024; if (!hpet_set_periodic_freq(rtc_freq)) { |
5fd1fe9c5
|
1088 1089 1090 1091 1092 1093 |
/* * Initialize periodic frequency to CMOS reset default, * which is 1024Hz */ CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); |
1da177e4c
|
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 |
} spin_unlock_irq(&rtc_lock); no_irq2: #endif (void) init_sysctl(); printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION " "); return 0; } |
5fd1fe9c5
|
1106 |
static void __exit rtc_exit(void) |
1da177e4c
|
1107 1108 |
{ cleanup_sysctl(); |
5fd1fe9c5
|
1109 |
remove_proc_entry("driver/rtc", NULL); |
1da177e4c
|
1110 |
misc_deregister(&rtc_dev); |
cdee99d74
|
1111 |
#ifdef CONFIG_SPARC32 |
1da177e4c
|
1112 |
if (rtc_has_irq) |
5fd1fe9c5
|
1113 |
free_irq(rtc_irq, &rtc_port); |
1da177e4c
|
1114 |
#else |
4c06be10c
|
1115 |
rtc_release_region(); |
1da177e4c
|
1116 |
#ifdef RTC_IRQ |
f8f76481b
|
1117 |
if (rtc_has_irq) { |
5fd1fe9c5
|
1118 |
free_irq(RTC_IRQ, NULL); |
f8f76481b
|
1119 1120 |
hpet_unregister_irq_handler(hpet_rtc_interrupt); } |
1da177e4c
|
1121 |
#endif |
cdee99d74
|
1122 |
#endif /* CONFIG_SPARC32 */ |
1da177e4c
|
1123 1124 1125 1126 1127 1128 1129 |
} module_init(rtc_init); module_exit(rtc_exit); #ifdef RTC_IRQ /* |
5fd1fe9c5
|
1130 |
* At IRQ rates >= 4096Hz, an interrupt may get lost altogether. |
1da177e4c
|
1131 1132 1133 1134 1135 1136 |
* (usually during an IDE disk interrupt, with IRQ unmasking off) * Since the interrupt handler doesn't get called, the IRQ status * byte doesn't get read, and the RTC stops generating interrupts. * A timer is set, and will call this function if/when that happens. * To get it out of this stalled state, we just read the status. * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. |
5fd1fe9c5
|
1137 |
* (You *really* shouldn't be trying to use a non-realtime system |
1da177e4c
|
1138 1139 1140 1141 1142 1143 |
* for something that requires a steady > 1KHz signal anyways.) */ static void rtc_dropped_irq(unsigned long data) { unsigned long freq; |
5fd1fe9c5
|
1144 |
spin_lock_irq(&rtc_lock); |
1da177e4c
|
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 |
if (hpet_rtc_dropped_irq()) { spin_unlock_irq(&rtc_lock); return; } /* Just in case someone disabled the timer from behind our back... */ if (rtc_status & RTC_TIMER_ON) mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); rtc_irq_data += ((rtc_freq/HZ)<<8); rtc_irq_data &= ~0xff; rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ freq = rtc_freq; spin_unlock_irq(&rtc_lock); |
5fd1fe9c5
|
1162 1163 1164 1165 1166 |
if (printk_ratelimit()) { printk(KERN_WARNING "rtc: lost some interrupts at %ldHz. ", freq); } |
1da177e4c
|
1167 1168 1169 |
/* Now we have new data */ wake_up_interruptible(&rtc_wait); |
5fd1fe9c5
|
1170 |
kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); |
1da177e4c
|
1171 1172 |
} #endif |
9cef779ec
|
1173 |
#ifdef CONFIG_PROC_FS |
1da177e4c
|
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/* * Info exported via "/proc/driver/rtc". */ static int rtc_proc_show(struct seq_file *seq, void *v) { #define YN(bit) ((ctrl & bit) ? "yes" : "no") #define NY(bit) ((ctrl & bit) ? "no" : "yes") struct rtc_time tm; unsigned char batt, ctrl; unsigned long freq; spin_lock_irq(&rtc_lock); batt = CMOS_READ(RTC_VALID) & RTC_VRT; ctrl = CMOS_READ(RTC_CONTROL); freq = rtc_freq; spin_unlock_irq(&rtc_lock); rtc_get_rtc_time(&tm); /* * There is no way to tell if the luser has the RTC set for local * time or for Universal Standard Time (GMT). Probably local though. */ seq_printf(seq, "rtc_time\t: %02d:%02d:%02d " "rtc_date\t: %04d-%02d-%02d " "rtc_epoch\t: %04lu ", tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); get_rtc_alm_time(&tm); /* * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will * match any value for that particular field. Values that are * greater than a valid time, but less than 0xc0 shouldn't appear. */ seq_puts(seq, "alarm\t\t: "); if (tm.tm_hour <= 24) seq_printf(seq, "%02d:", tm.tm_hour); else seq_puts(seq, "**:"); if (tm.tm_min <= 59) seq_printf(seq, "%02d:", tm.tm_min); else seq_puts(seq, "**:"); if (tm.tm_sec <= 59) seq_printf(seq, "%02d ", tm.tm_sec); else seq_puts(seq, "** "); seq_printf(seq, "DST_enable\t: %s " "BCD\t\t: %s " "24hr\t\t: %s " "square_wave\t: %s " "alarm_IRQ\t: %s " "update_IRQ\t: %s " "periodic_IRQ\t: %s " "periodic_freq\t: %ld " "batt_status\t: %s ", YN(RTC_DST_EN), NY(RTC_DM_BINARY), YN(RTC_24H), YN(RTC_SQWE), YN(RTC_AIE), YN(RTC_UIE), YN(RTC_PIE), freq, batt ? "okay" : "dead"); return 0; #undef YN #undef NY } static int rtc_proc_open(struct inode *inode, struct file *file) { return single_open(file, rtc_proc_show, NULL); } |
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#endif |
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static void rtc_get_rtc_time(struct rtc_time *rtc_tm) |
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{ |
0f7496462
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unsigned long uip_watchdog = jiffies, flags; |
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1277 1278 1279 1280 1281 1282 1283 |
unsigned char ctrl; #ifdef CONFIG_MACH_DECSTATION unsigned int real_year; #endif /* * read RTC once any update in progress is done. The update |
47f176fda
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* can take just over 2ms. We wait 20ms. There is no need to |
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1285 1286 |
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. * If you need to know *exactly* when a second has started, enable |
5fd1fe9c5
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1287 |
* periodic update complete interrupts, (via ioctl) and then |
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1288 1289 1290 |
* immediately read /dev/rtc which will block until you get the IRQ. * Once the read clears, read the RTC time (again via ioctl). Easy. */ |
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while (rtc_is_updating() != 0 && time_before(jiffies, uip_watchdog + 2*HZ/100)) |
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cpu_relax(); |
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/* * Only the values that we read from the RTC are set. We leave |
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* tm_wday, tm_yday and tm_isdst untouched. Note that while the * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is * only updated by the RTC when initially set to a non-zero value. |
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*/ |
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spin_lock_irqsave(&rtc_lock, flags); |
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rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); rtc_tm->tm_year = CMOS_READ(RTC_YEAR); |
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/* Only set from 2.6.16 onwards */ rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); |
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#ifdef CONFIG_MACH_DECSTATION real_year = CMOS_READ(RTC_DEC_YEAR); #endif ctrl = CMOS_READ(RTC_CONTROL); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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|
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if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
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rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday); |
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} #ifdef CONFIG_MACH_DECSTATION rtc_tm->tm_year += real_year - 72; #endif /* * Account for differences between how the RTC uses the values * and how they are defined in a struct rtc_time; */ |
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rtc_tm->tm_year += epoch - 1900; if (rtc_tm->tm_year <= 69) |
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rtc_tm->tm_year += 100; rtc_tm->tm_mon--; } static void get_rtc_alm_time(struct rtc_time *alm_tm) { unsigned char ctrl; /* * Only the values that we read from the RTC are set. That * means only tm_hour, tm_min, and tm_sec. */ spin_lock_irq(&rtc_lock); alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); ctrl = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); |
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if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
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1356 1357 1358 |
alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); alm_tm->tm_min = bcd2bin(alm_tm->tm_min); alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); |
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} } #ifdef RTC_IRQ /* * Used to disable/enable interrupts for any one of UIE, AIE, PIE. * Rumour has it that if you frob the interrupt enable/disable * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to * ensure you actually start getting interrupts. Probably for * compatibility with older/broken chipset RTC implementations. * We also clear out any old irq data after an ioctl() that * meddles with the interrupt enable/disable bits. */ |
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static void mask_rtc_irq_bit_locked(unsigned char bit) |
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1373 1374 |
{ unsigned char val; |
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if (hpet_mask_rtc_irq_bit(bit)) |
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return; |
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val = CMOS_READ(RTC_CONTROL); val &= ~bit; CMOS_WRITE(val, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); rtc_irq_data = 0; |
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} |
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static void set_rtc_irq_bit_locked(unsigned char bit) |
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{ unsigned char val; |
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if (hpet_set_rtc_irq_bit(bit)) |
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return; |
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val = CMOS_READ(RTC_CONTROL); val |= bit; CMOS_WRITE(val, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); rtc_irq_data = 0; |
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} #endif MODULE_AUTHOR("Paul Gortmaker"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(RTC_MINOR); |