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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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|
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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 <linux/ratelimit.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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|
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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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|
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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; |
1da177e4c Linux-2.6.12-rc2 |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 |
} 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; |
5fd1fe9c5 x86: clean up dri... |
562 |
|
1da177e4c Linux-2.6.12-rc2 |
563 564 |
if ((hrs >= 24) || (min >= 60) || (sec >= 60)) return -EINVAL; |
5fd1fe9c5 x86: clean up dri... |
565 566 |
yrs -= epoch; if (yrs > 255) /* They are unsigned */ |
1da177e4c Linux-2.6.12-rc2 |
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 |
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) { |
357c6e635 rtc: use bcd2bin/... |
596 597 598 599 600 601 |
sec = bin2bcd(sec); min = bin2bcd(min); hrs = bin2bcd(hrs); day = bin2bcd(day); mon = bin2bcd(mon); yrs = bin2bcd(yrs); |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 |
} 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 x86: clean up dri... |
634 635 |
/* can be called from isr via rtc_control() */ unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
636 |
|
5fd1fe9c5 x86: clean up dri... |
637 |
/* |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 |
* 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 x86: clean up dri... |
646 647 |
if (!kernel && (arg > rtc_max_user_freq) && !capable(CAP_SYS_RESOURCE)) |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 651 652 653 654 655 656 657 |
return -EACCES; while (arg > (1<<tmp)) tmp++; /* * Check that the input was really a power of 2. */ if (arg != (1<<tmp)) return -EINVAL; |
61ca9daa2 rtc: fix reported... |
658 |
rtc_freq = arg; |
c3348760a [PATCH] Fix wrong... |
659 |
spin_lock_irqsave(&rtc_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
660 |
if (hpet_set_periodic_freq(arg)) { |
c3348760a [PATCH] Fix wrong... |
661 |
spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
662 663 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
664 665 666 667 |
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; val |= (16 - tmp); CMOS_WRITE(val, RTC_FREQ_SELECT); |
c3348760a [PATCH] Fix wrong... |
668 |
spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 |
return 0; } #endif case RTC_EPOCH_READ: /* Read the epoch. */ { |
5fd1fe9c5 x86: clean up dri... |
674 |
return put_user(epoch, (unsigned long __user *)arg); |
1da177e4c Linux-2.6.12-rc2 |
675 676 677 |
} case RTC_EPOCH_SET: /* Set the epoch. */ { |
5fd1fe9c5 x86: clean up dri... |
678 |
/* |
1da177e4c Linux-2.6.12-rc2 |
679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
* 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 x86: clean up dri... |
693 694 |
return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; |
1da177e4c Linux-2.6.12-rc2 |
695 |
} |
53f1b1433 rtc: push the BKL... |
696 |
static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
697 |
{ |
53f1b1433 rtc: push the BKL... |
698 |
long ret; |
53f1b1433 rtc: push the BKL... |
699 |
ret = rtc_do_ioctl(cmd, arg, 0); |
53f1b1433 rtc: push the BKL... |
700 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
701 702 703 704 705 706 707 |
} /* * 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 Linux-2.6.12-rc2 |
708 709 |
static int rtc_open(struct inode *inode, struct file *file) { |
5fd1fe9c5 x86: clean up dri... |
710 |
spin_lock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
711 |
|
5fd1fe9c5 x86: clean up dri... |
712 |
if (rtc_status & RTC_IS_OPEN) |
1da177e4c Linux-2.6.12-rc2 |
713 714 715 716 717 |
goto out_busy; rtc_status |= RTC_IS_OPEN; rtc_irq_data = 0; |
5fd1fe9c5 x86: clean up dri... |
718 |
spin_unlock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
719 720 721 |
return 0; out_busy: |
5fd1fe9c5 x86: clean up dri... |
722 |
spin_unlock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
723 724 |
return -EBUSY; } |
5fd1fe9c5 x86: clean up dri... |
725 |
static int rtc_fasync(int fd, struct file *filp, int on) |
1da177e4c Linux-2.6.12-rc2 |
726 |
{ |
5fd1fe9c5 x86: clean up dri... |
727 |
return fasync_helper(fd, filp, on, &rtc_async_queue); |
1da177e4c Linux-2.6.12-rc2 |
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 |
} 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 Linux-2.6.12-rc2 |
757 758 |
no_irq: #endif |
5fd1fe9c5 x86: clean up dri... |
759 |
spin_lock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
760 761 |
rtc_irq_data = 0; rtc_status &= ~RTC_IS_OPEN; |
5fd1fe9c5 x86: clean up dri... |
762 |
spin_unlock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
763 764 765 766 |
return 0; } #ifdef RTC_IRQ |
1da177e4c Linux-2.6.12-rc2 |
767 768 769 770 771 772 773 774 |
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 x86: clean up dri... |
775 |
spin_lock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
776 |
l = rtc_irq_data; |
5fd1fe9c5 x86: clean up dri... |
777 |
spin_unlock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
778 779 780 781 782 783 |
if (l != 0) return POLLIN | POLLRDNORM; return 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 |
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 x86: clean up dri... |
809 |
EXPORT_SYMBOL(rtc_register); |
1da177e4c Linux-2.6.12-rc2 |
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 |
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 x86: clean up dri... |
826 |
|
1da177e4c Linux-2.6.12-rc2 |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
/* 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 x86: clean up dri... |
846 |
EXPORT_SYMBOL(rtc_unregister); |
1da177e4c Linux-2.6.12-rc2 |
847 848 849 850 851 852 |
int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) { #ifndef RTC_IRQ return -EIO; #else |
c3348760a [PATCH] Fix wrong... |
853 854 855 856 |
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 Linux-2.6.12-rc2 |
857 |
if (rtc_callback != task) { |
c3348760a [PATCH] Fix wrong... |
858 |
spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
859 860 |
return -ENXIO; } |
c3348760a [PATCH] Fix wrong... |
861 |
spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
862 863 864 |
return rtc_do_ioctl(cmd, arg, 1); #endif } |
5fd1fe9c5 x86: clean up dri... |
865 |
EXPORT_SYMBOL(rtc_control); |
1da177e4c Linux-2.6.12-rc2 |
866 867 868 869 |
/* * The various file operations we support. */ |
62322d255 [PATCH] make more... |
870 |
static const struct file_operations rtc_fops = { |
1da177e4c Linux-2.6.12-rc2 |
871 872 873 874 875 876 |
.owner = THIS_MODULE, .llseek = no_llseek, .read = rtc_read, #ifdef RTC_IRQ .poll = rtc_poll, #endif |
53f1b1433 rtc: push the BKL... |
877 |
.unlocked_ioctl = rtc_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
878 879 880 881 882 883 884 885 886 887 |
.open = rtc_open, .release = rtc_release, .fasync = rtc_fasync, }; static struct miscdevice rtc_dev = { .minor = RTC_MINOR, .name = "rtc", .fops = &rtc_fops, }; |
9cef779ec [PATCH] RTC drive... |
888 |
#ifdef CONFIG_PROC_FS |
62322d255 [PATCH] make more... |
889 |
static const struct file_operations rtc_proc_fops = { |
5fd1fe9c5 x86: clean up dri... |
890 891 892 893 894 |
.owner = THIS_MODULE, .open = rtc_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, |
1da177e4c Linux-2.6.12-rc2 |
895 |
}; |
1da177e4c Linux-2.6.12-rc2 |
896 |
#endif |
9626f1f11 rtc: fall back to... |
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 |
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 rtc: release corr... |
913 914 915 |
static void rtc_release_region(void) { if (RTC_IOMAPPED) |
9626f1f11 rtc: fall back to... |
916 |
release_region(RTC_PORT(0), rtc_size); |
4c06be10c rtc: release corr... |
917 |
else |
9626f1f11 rtc: fall back to... |
918 |
release_mem_region(RTC_PORT(0), rtc_size); |
4c06be10c rtc: release corr... |
919 |
} |
1da177e4c Linux-2.6.12-rc2 |
920 921 |
static int __init rtc_init(void) { |
9cef779ec [PATCH] RTC drive... |
922 |
#ifdef CONFIG_PROC_FS |
1da177e4c Linux-2.6.12-rc2 |
923 |
struct proc_dir_entry *ent; |
9cef779ec [PATCH] RTC drive... |
924 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
925 926 |
#if defined(__alpha__) || defined(__mips__) unsigned int year, ctrl; |
1da177e4c Linux-2.6.12-rc2 |
927 928 |
char *guess = NULL; #endif |
cdee99d74 [SPARC64]: Stop u... |
929 |
#ifdef CONFIG_SPARC32 |
75081322c sparc32: Convert ... |
930 |
struct device_node *ebus_dp; |
2dc115813 of/device: Replac... |
931 |
struct platform_device *op; |
9cef779ec [PATCH] RTC drive... |
932 |
#else |
38e0e8c05 [PATCH] char/rtc:... |
933 |
void *r; |
9cef779ec [PATCH] RTC drive... |
934 935 936 |
#ifdef RTC_IRQ irq_handler_t rtc_int_handler_ptr; #endif |
38e0e8c05 [PATCH] char/rtc:... |
937 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
938 |
|
cdee99d74 [SPARC64]: Stop u... |
939 |
#ifdef CONFIG_SPARC32 |
75081322c sparc32: Convert ... |
940 941 942 943 944 945 946 947 948 949 |
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 Linux-2.6.12-rc2 |
950 951 952 |
} } } |
f3e92d355 [PATCH] rtc: fx e... |
953 |
rtc_has_irq = 0; |
1da177e4c Linux-2.6.12-rc2 |
954 955 956 957 958 |
printk(KERN_ERR "rtc_init: no PC rtc found "); return -EIO; found: |
75081322c sparc32: Convert ... |
959 |
if (!rtc_irq) { |
1da177e4c Linux-2.6.12-rc2 |
960 961 962 963 964 965 |
rtc_has_irq = 0; goto no_irq; } /* * XXX Interrupt pin #7 in Espresso is shared between RTC and |
53d0fc27a [RTC]: Use SA_SHI... |
966 |
* PCI Slot 2 INTA# (and some INTx# in Slot 1). |
1da177e4c Linux-2.6.12-rc2 |
967 |
*/ |
5fd1fe9c5 x86: clean up dri... |
968 969 |
if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) { |
f3e92d355 [PATCH] rtc: fx e... |
970 |
rtc_has_irq = 0; |
1da177e4c Linux-2.6.12-rc2 |
971 972 973 974 975 976 |
printk(KERN_ERR "rtc: cannot register IRQ %d ", rtc_irq); return -EIO; } no_irq: #else |
9626f1f11 rtc: fall back to... |
977 978 979 980 981 982 983 984 985 986 987 |
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 [PATCH] char/rtc:... |
988 |
if (!r) { |
f3e92d355 [PATCH] rtc: fx e... |
989 990 991 |
#ifdef RTC_IRQ rtc_has_irq = 0; #endif |
38e0e8c05 [PATCH] char/rtc:... |
992 993 994 |
printk(KERN_ERR "rtc: I/O resource %lx is not free. ", (long)(RTC_PORT(0))); |
1da177e4c Linux-2.6.12-rc2 |
995 996 997 998 999 |
return -EIO; } #ifdef RTC_IRQ if (is_hpet_enabled()) { |
f8f76481b rtc: use the IRQ ... |
1000 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
rtc_int_handler_ptr = hpet_rtc_interrupt; |
f8f76481b rtc: use the IRQ ... |
1002 1003 1004 1005 1006 1007 |
err = hpet_register_irq_handler(rtc_interrupt); if (err != 0) { printk(KERN_WARNING "hpet_register_irq_handler failed " "in rtc_init()."); return err; } |
1da177e4c Linux-2.6.12-rc2 |
1008 1009 1010 |
} else { rtc_int_handler_ptr = rtc_interrupt; } |
5fd1fe9c5 x86: clean up dri... |
1011 1012 |
if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
1013 |
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */ |
f3e92d355 [PATCH] rtc: fx e... |
1014 |
rtc_has_irq = 0; |
1da177e4c Linux-2.6.12-rc2 |
1015 1016 |
printk(KERN_ERR "rtc: IRQ %d is not free. ", RTC_IRQ); |
4c06be10c rtc: release corr... |
1017 |
rtc_release_region(); |
5fd1fe9c5 x86: clean up dri... |
1018 |
|
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 1022 1023 |
return -EIO; } hpet_rtc_timer_init(); #endif |
cdee99d74 [SPARC64]: Stop u... |
1024 |
#endif /* CONFIG_SPARC32 vs. others */ |
1da177e4c Linux-2.6.12-rc2 |
1025 1026 1027 1028 |
if (misc_register(&rtc_dev)) { #ifdef RTC_IRQ free_irq(RTC_IRQ, NULL); |
f8f76481b rtc: use the IRQ ... |
1029 |
hpet_unregister_irq_handler(rtc_interrupt); |
f3e92d355 [PATCH] rtc: fx e... |
1030 |
rtc_has_irq = 0; |
1da177e4c Linux-2.6.12-rc2 |
1031 |
#endif |
4c06be10c rtc: release corr... |
1032 |
rtc_release_region(); |
1da177e4c Linux-2.6.12-rc2 |
1033 1034 |
return -ENODEV; } |
9cef779ec [PATCH] RTC drive... |
1035 |
#ifdef CONFIG_PROC_FS |
1b5022173 drivers: use non-... |
1036 1037 |
ent = proc_create("driver/rtc", 0, NULL, &rtc_proc_fops); if (!ent) |
9cef779ec [PATCH] RTC drive... |
1038 1039 |
printk(KERN_WARNING "rtc: Failed to register with procfs. "); |
1da177e4c Linux-2.6.12-rc2 |
1040 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 |
#if defined(__alpha__) || defined(__mips__) rtc_freq = HZ; |
5fd1fe9c5 x86: clean up dri... |
1044 |
|
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
/* Each operating system on an Alpha uses its own epoch. Let's try to guess which one we are using now. */ |
5fd1fe9c5 x86: clean up dri... |
1047 |
|
1da177e4c Linux-2.6.12-rc2 |
1048 |
if (rtc_is_updating() != 0) |
47f176fda [PATCH] Using msl... |
1049 |
msleep(20); |
5fd1fe9c5 x86: clean up dri... |
1050 |
|
1da177e4c Linux-2.6.12-rc2 |
1051 1052 1053 1054 |
spin_lock_irq(&rtc_lock); year = CMOS_READ(RTC_YEAR); ctrl = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); |
5fd1fe9c5 x86: clean up dri... |
1055 |
|
1da177e4c Linux-2.6.12-rc2 |
1056 |
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) |
357c6e635 rtc: use bcd2bin/... |
1057 |
year = bcd2bin(year); /* This should never happen... */ |
5fd1fe9c5 x86: clean up dri... |
1058 |
|
1da177e4c Linux-2.6.12-rc2 |
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 |
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 x86: clean up dri... |
1079 1080 1081 |
printk(KERN_INFO "rtc: %s epoch (%lu) detected ", guess, epoch); |
1da177e4c Linux-2.6.12-rc2 |
1082 1083 1084 1085 |
#endif #ifdef RTC_IRQ if (rtc_has_irq == 0) goto no_irq2; |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 |
spin_lock_irq(&rtc_lock); rtc_freq = 1024; if (!hpet_set_periodic_freq(rtc_freq)) { |
5fd1fe9c5 x86: clean up dri... |
1089 1090 1091 1092 1093 1094 |
/* * Initialize periodic frequency to CMOS reset default, * which is 1024Hz */ CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 |
} spin_unlock_irq(&rtc_lock); no_irq2: #endif (void) init_sysctl(); printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION " "); return 0; } |
5fd1fe9c5 x86: clean up dri... |
1107 |
static void __exit rtc_exit(void) |
1da177e4c Linux-2.6.12-rc2 |
1108 1109 |
{ cleanup_sysctl(); |
5fd1fe9c5 x86: clean up dri... |
1110 |
remove_proc_entry("driver/rtc", NULL); |
1da177e4c Linux-2.6.12-rc2 |
1111 |
misc_deregister(&rtc_dev); |
cdee99d74 [SPARC64]: Stop u... |
1112 |
#ifdef CONFIG_SPARC32 |
1da177e4c Linux-2.6.12-rc2 |
1113 |
if (rtc_has_irq) |
5fd1fe9c5 x86: clean up dri... |
1114 |
free_irq(rtc_irq, &rtc_port); |
1da177e4c Linux-2.6.12-rc2 |
1115 |
#else |
4c06be10c rtc: release corr... |
1116 |
rtc_release_region(); |
1da177e4c Linux-2.6.12-rc2 |
1117 |
#ifdef RTC_IRQ |
f8f76481b rtc: use the IRQ ... |
1118 |
if (rtc_has_irq) { |
5fd1fe9c5 x86: clean up dri... |
1119 |
free_irq(RTC_IRQ, NULL); |
f8f76481b rtc: use the IRQ ... |
1120 1121 |
hpet_unregister_irq_handler(hpet_rtc_interrupt); } |
1da177e4c Linux-2.6.12-rc2 |
1122 |
#endif |
cdee99d74 [SPARC64]: Stop u... |
1123 |
#endif /* CONFIG_SPARC32 */ |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 1127 1128 1129 1130 |
} module_init(rtc_init); module_exit(rtc_exit); #ifdef RTC_IRQ /* |
5fd1fe9c5 x86: clean up dri... |
1131 |
* At IRQ rates >= 4096Hz, an interrupt may get lost altogether. |
1da177e4c Linux-2.6.12-rc2 |
1132 1133 1134 1135 1136 1137 |
* (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 x86: clean up dri... |
1138 |
* (You *really* shouldn't be trying to use a non-realtime system |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 1141 1142 1143 1144 |
* for something that requires a steady > 1KHz signal anyways.) */ static void rtc_dropped_irq(unsigned long data) { unsigned long freq; |
5fd1fe9c5 x86: clean up dri... |
1145 |
spin_lock_irq(&rtc_lock); |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 |
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); |
a28ee477e drivers/char/rtc:... |
1163 1164 1165 |
printk_ratelimited(KERN_WARNING "rtc: lost some interrupts at %ldHz. ", freq); |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 1168 |
/* Now we have new data */ wake_up_interruptible(&rtc_wait); |
5fd1fe9c5 x86: clean up dri... |
1169 |
kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); |
1da177e4c Linux-2.6.12-rc2 |
1170 1171 |
} #endif |
9cef779ec [PATCH] RTC drive... |
1172 |
#ifdef CONFIG_PROC_FS |
1da177e4c Linux-2.6.12-rc2 |
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 |
/* * 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); } |
9cef779ec [PATCH] RTC drive... |
1271 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1272 |
|
9580d85f9 drivers/char/rtc.... |
1273 |
static void rtc_get_rtc_time(struct rtc_time *rtc_tm) |
1da177e4c Linux-2.6.12-rc2 |
1274 |
{ |
0f7496462 [PATCH] lockdep: ... |
1275 |
unsigned long uip_watchdog = jiffies, flags; |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 1278 1279 1280 1281 1282 |
unsigned char ctrl; #ifdef CONFIG_MACH_DECSTATION unsigned int real_year; #endif /* * read RTC once any update in progress is done. The update |
47f176fda [PATCH] Using msl... |
1283 |
* can take just over 2ms. We wait 20ms. There is no need to |
1da177e4c Linux-2.6.12-rc2 |
1284 1285 |
* 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 x86: clean up dri... |
1286 |
* periodic update complete interrupts, (via ioctl) and then |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 1289 |
* immediately read /dev/rtc which will block until you get the IRQ. * Once the read clears, read the RTC time (again via ioctl). Easy. */ |
dca03a515 drivers/char/rtc.... |
1290 1291 |
while (rtc_is_updating() != 0 && time_before(jiffies, uip_watchdog + 2*HZ/100)) |
403fe5ae5 [PATCH] rtc: msle... |
1292 |
cpu_relax(); |
1da177e4c Linux-2.6.12-rc2 |
1293 1294 1295 |
/* * Only the values that we read from the RTC are set. We leave |
b7599587f [PATCH] Allow rea... |
1296 1297 1298 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
1299 |
*/ |
0f7496462 [PATCH] lockdep: ... |
1300 |
spin_lock_irqsave(&rtc_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1301 1302 1303 1304 1305 1306 |
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); |
b7599587f [PATCH] Allow rea... |
1307 1308 |
/* Only set from 2.6.16 onwards */ rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 1311 1312 |
#ifdef CONFIG_MACH_DECSTATION real_year = CMOS_READ(RTC_DEC_YEAR); #endif ctrl = CMOS_READ(RTC_CONTROL); |
0f7496462 [PATCH] lockdep: ... |
1313 |
spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1314 |
|
5fd1fe9c5 x86: clean up dri... |
1315 |
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
357c6e635 rtc: use bcd2bin/... |
1316 1317 1318 1319 1320 1321 1322 |
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); |
1da177e4c Linux-2.6.12-rc2 |
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 |
} #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; */ |
5fd1fe9c5 x86: clean up dri... |
1333 1334 |
rtc_tm->tm_year += epoch - 1900; if (rtc_tm->tm_year <= 69) |
1da177e4c Linux-2.6.12-rc2 |
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 |
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); |
5fd1fe9c5 x86: clean up dri... |
1354 |
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
357c6e635 rtc: use bcd2bin/... |
1355 1356 1357 |
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); |
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 |
} } #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. */ |
c3348760a [PATCH] Fix wrong... |
1371 |
static void mask_rtc_irq_bit_locked(unsigned char bit) |
1da177e4c Linux-2.6.12-rc2 |
1372 1373 |
{ unsigned char val; |
c3348760a [PATCH] Fix wrong... |
1374 |
if (hpet_mask_rtc_irq_bit(bit)) |
1da177e4c Linux-2.6.12-rc2 |
1375 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1376 1377 1378 1379 1380 1381 |
val = CMOS_READ(RTC_CONTROL); val &= ~bit; CMOS_WRITE(val, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); rtc_irq_data = 0; |
1da177e4c Linux-2.6.12-rc2 |
1382 |
} |
c3348760a [PATCH] Fix wrong... |
1383 |
static void set_rtc_irq_bit_locked(unsigned char bit) |
1da177e4c Linux-2.6.12-rc2 |
1384 1385 |
{ unsigned char val; |
c3348760a [PATCH] Fix wrong... |
1386 |
if (hpet_set_rtc_irq_bit(bit)) |
1da177e4c Linux-2.6.12-rc2 |
1387 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1388 1389 1390 1391 1392 1393 |
val = CMOS_READ(RTC_CONTROL); val |= bit; CMOS_WRITE(val, RTC_CONTROL); CMOS_READ(RTC_INTR_FLAGS); rtc_irq_data = 0; |
1da177e4c Linux-2.6.12-rc2 |
1394 1395 1396 1397 1398 1399 |
} #endif MODULE_AUTHOR("Paul Gortmaker"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(RTC_MINOR); |