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x86: clean up drivers/char/rtc.c

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tons of style cleanup in drivers/char/rtc.c - no code changed:

   text    data     bss     dec     hex filename
   6400     384      32    6816    1aa0 rtc.o.before
   6400     384      32    6816    1aa0 rtc.o.after

since we seem to have a number of open breakages in this code we might
as well start with making the code more readable and maintainable.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:31:09 +01:00
parent 6b4b05bd79
commit 5fd1fe9c58
1 changed files with 127 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

234
drivers/char/rtc.c
View File

@ -1,5 +1,5 @@
/* /*
* Real Time Clock interface for Linux * Real Time Clock interface for Linux
* *
* Copyright (C) 1996 Paul Gortmaker * Copyright (C) 1996 Paul Gortmaker
* *
@ -17,7 +17,7 @@
* has been received. If a RTC interrupt has already happened, * has been received. If a RTC interrupt has already happened,
* it will output an unsigned long and then block. The output value * it will output an unsigned long and then block. The output value
* contains the interrupt status in the low byte and the number of * contains the interrupt status in the low byte and the number of
* interrupts since the last read in the remaining high bytes. The * interrupts since the last read in the remaining high bytes. The
* /dev/rtc interface can also be used with the select(2) call. * /dev/rtc interface can also be used with the select(2) call.
* *
* This program is free software; you can redistribute it and/or * This program is free software; you can redistribute it and/or
@ -104,12 +104,12 @@ static int rtc_has_irq = 1;
#ifndef CONFIG_HPET_EMULATE_RTC #ifndef CONFIG_HPET_EMULATE_RTC
#define is_hpet_enabled() 0 #define is_hpet_enabled() 0
#define hpet_set_alarm_time(hrs, min, sec) 0 #define hpet_set_alarm_time(hrs, min, sec) 0
#define hpet_set_periodic_freq(arg) 0 #define hpet_set_periodic_freq(arg) 0
#define hpet_mask_rtc_irq_bit(arg) 0 #define hpet_mask_rtc_irq_bit(arg) 0
#define hpet_set_rtc_irq_bit(arg) 0 #define hpet_set_rtc_irq_bit(arg) 0
#define hpet_rtc_timer_init() do { } while (0) #define hpet_rtc_timer_init() do { } while (0)
#define hpet_rtc_dropped_irq() 0 #define hpet_rtc_dropped_irq() 0
#ifdef RTC_IRQ #ifdef RTC_IRQ
static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
{ {
@ -147,7 +147,7 @@ static int rtc_ioctl(struct inode *inode, struct file *file,
static unsigned int rtc_poll(struct file *file, poll_table *wait); static unsigned int rtc_poll(struct file *file, poll_table *wait);
#endif #endif
static void get_rtc_alm_time (struct rtc_time *alm_tm); static void get_rtc_alm_time(struct rtc_time *alm_tm);
#ifdef RTC_IRQ #ifdef RTC_IRQ
static void set_rtc_irq_bit_locked(unsigned char bit); static void set_rtc_irq_bit_locked(unsigned char bit);
static void mask_rtc_irq_bit_locked(unsigned char bit); static void mask_rtc_irq_bit_locked(unsigned char bit);
@ -185,9 +185,9 @@ static int rtc_proc_open(struct inode *inode, struct file *file);
* rtc_status but before mod_timer is called, which would then reenable the * 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) * timer (but you would need to have an awful timing before you'd trip on it)
*/ */
static unsigned long rtc_status = 0; /* bitmapped status byte. */ static unsigned long rtc_status; /* bitmapped status byte. */
static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */ static unsigned long rtc_freq; /* Current periodic IRQ rate */
static unsigned long rtc_irq_data = 0; /* our output to the world */ static unsigned long rtc_irq_data; /* our output to the world */
static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */
#ifdef RTC_IRQ #ifdef RTC_IRQ
@ -195,7 +195,7 @@ static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */
* rtc_task_lock nests inside rtc_lock. * rtc_task_lock nests inside rtc_lock.
*/ */
static DEFINE_SPINLOCK(rtc_task_lock); static DEFINE_SPINLOCK(rtc_task_lock);
static rtc_task_t *rtc_callback = NULL; static rtc_task_t *rtc_callback;
#endif #endif
/* /*
@ -205,7 +205,7 @@ static rtc_task_t *rtc_callback = NULL;
static unsigned long epoch = 1900; /* year corresponding to 0x00 */ static unsigned long epoch = 1900; /* year corresponding to 0x00 */
static const unsigned char days_in_mo[] = static const unsigned char days_in_mo[] =
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
/* /*
@ -242,7 +242,7 @@ irqreturn_t rtc_interrupt(int irq, void *dev_id)
* the last read in the remainder of rtc_irq_data. * the last read in the remainder of rtc_irq_data.
*/ */
spin_lock (&rtc_lock); spin_lock(&rtc_lock);
rtc_irq_data += 0x100; rtc_irq_data += 0x100;
rtc_irq_data &= ~0xff; rtc_irq_data &= ~0xff;
if (is_hpet_enabled()) { if (is_hpet_enabled()) {
@ -259,16 +259,16 @@ irqreturn_t rtc_interrupt(int irq, void *dev_id)
if (rtc_status & RTC_TIMER_ON) if (rtc_status & RTC_TIMER_ON)
mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100);
spin_unlock (&rtc_lock); spin_unlock(&rtc_lock);
/* Now do the rest of the actions */ /* Now do the rest of the actions */
spin_lock(&rtc_task_lock); spin_lock(&rtc_task_lock);
if (rtc_callback) if (rtc_callback)
rtc_callback->func(rtc_callback->private_data); rtc_callback->func(rtc_callback->private_data);
spin_unlock(&rtc_task_lock); spin_unlock(&rtc_task_lock);
wake_up_interruptible(&rtc_wait); wake_up_interruptible(&rtc_wait);
kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -335,7 +335,7 @@ static ssize_t rtc_read(struct file *file, char __user *buf,
DECLARE_WAITQUEUE(wait, current); DECLARE_WAITQUEUE(wait, current);
unsigned long data; unsigned long data;
ssize_t retval; ssize_t retval;
if (rtc_has_irq == 0) if (rtc_has_irq == 0)
return -EIO; return -EIO;
@ -358,11 +358,11 @@ static ssize_t rtc_read(struct file *file, char __user *buf,
* confusing. And no, xchg() is not the answer. */ * confusing. And no, xchg() is not the answer. */
__set_current_state(TASK_INTERRUPTIBLE); __set_current_state(TASK_INTERRUPTIBLE);
spin_lock_irq (&rtc_lock); spin_lock_irq(&rtc_lock);
data = rtc_irq_data; data = rtc_irq_data;
rtc_irq_data = 0; rtc_irq_data = 0;
spin_unlock_irq (&rtc_lock); spin_unlock_irq(&rtc_lock);
if (data != 0) if (data != 0)
break; break;
@ -378,10 +378,13 @@ static ssize_t rtc_read(struct file *file, char __user *buf,
schedule(); schedule();
} while (1); } while (1);
if (count == sizeof(unsigned int)) if (count == sizeof(unsigned int)) {
retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); retval = put_user(data,
else (unsigned int __user *)buf) ?: sizeof(int);
retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long); } else {
retval = put_user(data,
(unsigned long __user *)buf) ?: sizeof(long);
}
if (!retval) if (!retval)
retval = count; retval = count;
out: out:
@ -394,7 +397,7 @@ static ssize_t rtc_read(struct file *file, char __user *buf,
static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{ {
struct rtc_time wtime; struct rtc_time wtime;
#ifdef RTC_IRQ #ifdef RTC_IRQ
if (rtc_has_irq == 0) { if (rtc_has_irq == 0) {
@ -426,35 +429,41 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
} }
case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
{ {
unsigned long flags; /* can be called from isr via rtc_control() */ /* can be called from isr via rtc_control() */
spin_lock_irqsave (&rtc_lock, flags); unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
mask_rtc_irq_bit_locked(RTC_PIE); mask_rtc_irq_bit_locked(RTC_PIE);
if (rtc_status & RTC_TIMER_ON) { if (rtc_status & RTC_TIMER_ON) {
rtc_status &= ~RTC_TIMER_ON; rtc_status &= ~RTC_TIMER_ON;
del_timer(&rtc_irq_timer); del_timer(&rtc_irq_timer);
} }
spin_unlock_irqrestore (&rtc_lock, flags); spin_unlock_irqrestore(&rtc_lock, flags);
return 0; return 0;
} }
case RTC_PIE_ON: /* Allow periodic ints */ case RTC_PIE_ON: /* Allow periodic ints */
{ {
unsigned long flags; /* can be called from isr via rtc_control() */ /* can be called from isr via rtc_control() */
unsigned long flags;
/* /*
* We don't really want Joe User enabling more * We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine. * than 64Hz of interrupts on a multi-user machine.
*/ */
if (!kernel && (rtc_freq > rtc_max_user_freq) && if (!kernel && (rtc_freq > rtc_max_user_freq) &&
(!capable(CAP_SYS_RESOURCE))) (!capable(CAP_SYS_RESOURCE)))
return -EACCES; return -EACCES;
spin_lock_irqsave (&rtc_lock, flags); spin_lock_irqsave(&rtc_lock, flags);
if (!(rtc_status & RTC_TIMER_ON)) { if (!(rtc_status & RTC_TIMER_ON)) {
mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq +
2*HZ/100); 2*HZ/100);
rtc_status |= RTC_TIMER_ON; rtc_status |= RTC_TIMER_ON;
} }
set_rtc_irq_bit_locked(RTC_PIE); set_rtc_irq_bit_locked(RTC_PIE);
spin_unlock_irqrestore (&rtc_lock, flags); spin_unlock_irqrestore(&rtc_lock, flags);
return 0; return 0;
} }
case RTC_UIE_OFF: /* Mask ints from RTC updates. */ case RTC_UIE_OFF: /* Mask ints from RTC updates. */
@ -477,7 +486,7 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
*/ */
memset(&wtime, 0, sizeof(struct rtc_time)); memset(&wtime, 0, sizeof(struct rtc_time));
get_rtc_alm_time(&wtime); get_rtc_alm_time(&wtime);
break; break;
} }
case RTC_ALM_SET: /* Store a time into the alarm */ case RTC_ALM_SET: /* Store a time into the alarm */
{ {
@ -505,16 +514,21 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
*/ */
} }
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) ||
RTC_ALWAYS_BCD) RTC_ALWAYS_BCD) {
{ if (sec < 60)
if (sec < 60) BIN_TO_BCD(sec); BIN_TO_BCD(sec);
else sec = 0xff; else
sec = 0xff;
if (min < 60) BIN_TO_BCD(min); if (min < 60)
else min = 0xff; BIN_TO_BCD(min);
else
min = 0xff;
if (hrs < 24) BIN_TO_BCD(hrs); if (hrs < 24)
else hrs = 0xff; BIN_TO_BCD(hrs);
else
hrs = 0xff;
} }
CMOS_WRITE(hrs, RTC_HOURS_ALARM); CMOS_WRITE(hrs, RTC_HOURS_ALARM);
CMOS_WRITE(min, RTC_MINUTES_ALARM); CMOS_WRITE(min, RTC_MINUTES_ALARM);
@ -563,11 +577,12 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
return -EINVAL; return -EINVAL;
if ((hrs >= 24) || (min >= 60) || (sec >= 60)) if ((hrs >= 24) || (min >= 60) || (sec >= 60))
return -EINVAL; return -EINVAL;
if ((yrs -= epoch) > 255) /* They are unsigned */ yrs -= epoch;
if (yrs > 255) /* They are unsigned */
return -EINVAL; return -EINVAL;
spin_lock_irq(&rtc_lock); spin_lock_irq(&rtc_lock);
@ -635,9 +650,10 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{ {
int tmp = 0; int tmp = 0;
unsigned char val; unsigned char val;
unsigned long flags; /* can be called from isr via rtc_control() */ /* can be called from isr via rtc_control() */
unsigned long flags;
/* /*
* The max we can do is 8192Hz. * The max we can do is 8192Hz.
*/ */
if ((arg < 2) || (arg > 8192)) if ((arg < 2) || (arg > 8192))
@ -646,7 +662,8 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
* We don't really want Joe User generating more * We don't really want Joe User generating more
* than 64Hz of interrupts on a multi-user machine. * than 64Hz of interrupts on a multi-user machine.
*/ */
if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) if (!kernel && (arg > rtc_max_user_freq) &&
!capable(CAP_SYS_RESOURCE))
return -EACCES; return -EACCES;
while (arg > (1<<tmp)) while (arg > (1<<tmp))
@ -674,11 +691,11 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
#endif #endif
case RTC_EPOCH_READ: /* Read the epoch. */ case RTC_EPOCH_READ: /* Read the epoch. */
{ {
return put_user (epoch, (unsigned long __user *)arg); return put_user(epoch, (unsigned long __user *)arg);
} }
case RTC_EPOCH_SET: /* Set the epoch. */ case RTC_EPOCH_SET: /* Set the epoch. */
{ {
/* /*
* There were no RTC clocks before 1900. * There were no RTC clocks before 1900.
*/ */
if (arg < 1900) if (arg < 1900)
@ -693,7 +710,8 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
default: default:
return -ENOTTY; return -ENOTTY;
} }
return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; return copy_to_user((void __user *)arg,
&wtime, sizeof wtime) ? -EFAULT : 0;
} }
static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
@ -712,26 +730,25 @@ static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
* needed here. Or anywhere else in this driver. */ * needed here. Or anywhere else in this driver. */
static int rtc_open(struct inode *inode, struct file *file) static int rtc_open(struct inode *inode, struct file *file)
{ {
spin_lock_irq (&rtc_lock); spin_lock_irq(&rtc_lock);
if(rtc_status & RTC_IS_OPEN) if (rtc_status & RTC_IS_OPEN)
goto out_busy; goto out_busy;
rtc_status |= RTC_IS_OPEN; rtc_status |= RTC_IS_OPEN;
rtc_irq_data = 0; rtc_irq_data = 0;
spin_unlock_irq (&rtc_lock); spin_unlock_irq(&rtc_lock);
return 0; return 0;
out_busy: out_busy:
spin_unlock_irq (&rtc_lock); spin_unlock_irq(&rtc_lock);
return -EBUSY; return -EBUSY;
} }
static int rtc_fasync (int fd, struct file *filp, int on) static int rtc_fasync(int fd, struct file *filp, int on)
{ {
return fasync_helper (fd, filp, on, &rtc_async_queue); return fasync_helper(fd, filp, on, &rtc_async_queue);
} }
static int rtc_release(struct inode *inode, struct file *file) static int rtc_release(struct inode *inode, struct file *file)
@ -762,16 +779,16 @@ static int rtc_release(struct inode *inode, struct file *file)
} }
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
if (file->f_flags & FASYNC) { if (file->f_flags & FASYNC)
rtc_fasync (-1, file, 0); rtc_fasync(-1, file, 0);
}
no_irq: no_irq:
#endif #endif
spin_lock_irq (&rtc_lock); spin_lock_irq(&rtc_lock);
rtc_irq_data = 0; rtc_irq_data = 0;
rtc_status &= ~RTC_IS_OPEN; rtc_status &= ~RTC_IS_OPEN;
spin_unlock_irq (&rtc_lock); spin_unlock_irq(&rtc_lock);
return 0; return 0;
} }
@ -786,9 +803,9 @@ static unsigned int rtc_poll(struct file *file, poll_table *wait)
poll_wait(file, &rtc_wait, wait); poll_wait(file, &rtc_wait, wait);
spin_lock_irq (&rtc_lock); spin_lock_irq(&rtc_lock);
l = rtc_irq_data; l = rtc_irq_data;
spin_unlock_irq (&rtc_lock); spin_unlock_irq(&rtc_lock);
if (l != 0) if (l != 0)
return POLLIN | POLLRDNORM; return POLLIN | POLLRDNORM;
@ -796,14 +813,6 @@ static unsigned int rtc_poll(struct file *file, poll_table *wait)
} }
#endif #endif
/*
* exported stuffs
*/
EXPORT_SYMBOL(rtc_register);
EXPORT_SYMBOL(rtc_unregister);
EXPORT_SYMBOL(rtc_control);
int rtc_register(rtc_task_t *task) int rtc_register(rtc_task_t *task)
{ {
#ifndef RTC_IRQ #ifndef RTC_IRQ
@ -829,6 +838,7 @@ int rtc_register(rtc_task_t *task)
return 0; return 0;
#endif #endif
} }
EXPORT_SYMBOL(rtc_register);
int rtc_unregister(rtc_task_t *task) int rtc_unregister(rtc_task_t *task)
{ {
@ -845,7 +855,7 @@ int rtc_unregister(rtc_task_t *task)
return -ENXIO; return -ENXIO;
} }
rtc_callback = NULL; rtc_callback = NULL;
/* disable controls */ /* disable controls */
if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) {
tmp = CMOS_READ(RTC_CONTROL); tmp = CMOS_READ(RTC_CONTROL);
@ -865,6 +875,7 @@ int rtc_unregister(rtc_task_t *task)
return 0; return 0;
#endif #endif
} }
EXPORT_SYMBOL(rtc_unregister);
int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
{ {
@ -883,7 +894,7 @@ int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
return rtc_do_ioctl(cmd, arg, 1); return rtc_do_ioctl(cmd, arg, 1);
#endif #endif
} }
EXPORT_SYMBOL(rtc_control);
/* /*
* The various file operations we support. * The various file operations we support.
@ -910,11 +921,11 @@ static struct miscdevice rtc_dev = {
#ifdef CONFIG_PROC_FS #ifdef CONFIG_PROC_FS
static const struct file_operations rtc_proc_fops = { static const struct file_operations rtc_proc_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.open = rtc_proc_open, .open = rtc_proc_open,
.read = seq_read, .read = seq_read,
.llseek = seq_lseek, .llseek = seq_lseek,
.release = single_release, .release = single_release,
}; };
#endif #endif
@ -965,7 +976,7 @@ static int __init rtc_init(void)
#ifdef CONFIG_SPARC32 #ifdef CONFIG_SPARC32
for_each_ebus(ebus) { for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) { for_each_ebusdev(edev, ebus) {
if(strcmp(edev->prom_node->name, "rtc") == 0) { if (strcmp(edev->prom_node->name, "rtc") == 0) {
rtc_port = edev->resource[0].start; rtc_port = edev->resource[0].start;
rtc_irq = edev->irqs[0]; rtc_irq = edev->irqs[0];
goto found; goto found;
@ -986,7 +997,8 @@ found:
* XXX Interrupt pin #7 in Espresso is shared between RTC and * XXX Interrupt pin #7 in Espresso is shared between RTC and
* PCI Slot 2 INTA# (and some INTx# in Slot 1). * PCI Slot 2 INTA# (and some INTx# in Slot 1).
*/ */
if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) { if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc",
(void *)&rtc_port)) {
rtc_has_irq = 0; rtc_has_irq = 0;
printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq);
return -EIO; return -EIO;
@ -1020,11 +1032,13 @@ no_irq:
rtc_int_handler_ptr = rtc_interrupt; rtc_int_handler_ptr = rtc_interrupt;
} }
if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) { if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED,
"rtc", NULL)) {
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */ /* Yeah right, seeing as irq 8 doesn't even hit the bus. */
rtc_has_irq = 0; rtc_has_irq = 0;
printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
rtc_release_region(); rtc_release_region();
return -EIO; return -EIO;
} }
hpet_rtc_timer_init(); hpet_rtc_timer_init();
@ -1052,21 +1066,21 @@ no_irq:
#if defined(__alpha__) || defined(__mips__) #if defined(__alpha__) || defined(__mips__)
rtc_freq = HZ; rtc_freq = HZ;
/* Each operating system on an Alpha uses its own epoch. /* Each operating system on an Alpha uses its own epoch.
Let's try to guess which one we are using now. */ Let's try to guess which one we are using now. */
if (rtc_is_updating() != 0) if (rtc_is_updating() != 0)
msleep(20); msleep(20);
spin_lock_irq(&rtc_lock); spin_lock_irq(&rtc_lock);
year = CMOS_READ(RTC_YEAR); year = CMOS_READ(RTC_YEAR);
ctrl = CMOS_READ(RTC_CONTROL); ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
BCD_TO_BIN(year); /* This should never happen... */ BCD_TO_BIN(year); /* This should never happen... */
if (year < 20) { if (year < 20) {
epoch = 2000; epoch = 2000;
guess = "SRM (post-2000)"; guess = "SRM (post-2000)";
@ -1087,7 +1101,8 @@ no_irq:
#endif #endif
} }
if (guess) if (guess)
printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch); printk(KERN_INFO "rtc: %s epoch (%lu) detected\n",
guess, epoch);
#endif #endif
#ifdef RTC_IRQ #ifdef RTC_IRQ
if (rtc_has_irq == 0) if (rtc_has_irq == 0)
@ -1096,8 +1111,12 @@ no_irq:
spin_lock_irq(&rtc_lock); spin_lock_irq(&rtc_lock);
rtc_freq = 1024; rtc_freq = 1024;
if (!hpet_set_periodic_freq(rtc_freq)) { if (!hpet_set_periodic_freq(rtc_freq)) {
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */ /*
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); * Initialize periodic frequency to CMOS reset default,
* which is 1024Hz
*/
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06),
RTC_FREQ_SELECT);
} }
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
no_irq2: no_irq2:
@ -1110,20 +1129,20 @@ no_irq2:
return 0; return 0;
} }
static void __exit rtc_exit (void) static void __exit rtc_exit(void)
{ {
cleanup_sysctl(); cleanup_sysctl();
remove_proc_entry ("driver/rtc", NULL); remove_proc_entry("driver/rtc", NULL);
misc_deregister(&rtc_dev); misc_deregister(&rtc_dev);
#ifdef CONFIG_SPARC32 #ifdef CONFIG_SPARC32
if (rtc_has_irq) if (rtc_has_irq)
free_irq (rtc_irq, &rtc_port); free_irq(rtc_irq, &rtc_port);
#else #else
rtc_release_region(); rtc_release_region();
#ifdef RTC_IRQ #ifdef RTC_IRQ
if (rtc_has_irq) if (rtc_has_irq)
free_irq (RTC_IRQ, NULL); free_irq(RTC_IRQ, NULL);
#endif #endif
#endif /* CONFIG_SPARC32 */ #endif /* CONFIG_SPARC32 */
} }
@ -1133,14 +1152,14 @@ module_exit(rtc_exit);
#ifdef RTC_IRQ #ifdef RTC_IRQ
/* /*
* At IRQ rates >= 4096Hz, an interrupt may get lost altogether. * At IRQ rates >= 4096Hz, an interrupt may get lost altogether.
* (usually during an IDE disk interrupt, with IRQ unmasking off) * (usually during an IDE disk interrupt, with IRQ unmasking off)
* Since the interrupt handler doesn't get called, the IRQ status * Since the interrupt handler doesn't get called, the IRQ status
* byte doesn't get read, and the RTC stops generating interrupts. * byte doesn't get read, and the RTC stops generating interrupts.
* A timer is set, and will call this function if/when that happens. * 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. * 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. * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost.
* (You *really* shouldn't be trying to use a non-realtime system * (You *really* shouldn't be trying to use a non-realtime system
* for something that requires a steady > 1KHz signal anyways.) * for something that requires a steady > 1KHz signal anyways.)
*/ */
@ -1148,7 +1167,7 @@ static void rtc_dropped_irq(unsigned long data)
{ {
unsigned long freq; unsigned long freq;
spin_lock_irq (&rtc_lock); spin_lock_irq(&rtc_lock);
if (hpet_rtc_dropped_irq()) { if (hpet_rtc_dropped_irq()) {
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
@ -1167,13 +1186,15 @@ static void rtc_dropped_irq(unsigned long data)
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
if (printk_ratelimit()) if (printk_ratelimit()) {
printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq); printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n",
freq);
}
/* Now we have new data */ /* Now we have new data */
wake_up_interruptible(&rtc_wait); wake_up_interruptible(&rtc_wait);
kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
} }
#endif #endif
@ -1277,7 +1298,7 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
* can take just over 2ms. We wait 20ms. There is no need to * can take just over 2ms. We wait 20ms. There is no need to
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. * 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 * If you need to know *exactly* when a second has started, enable
* periodic update complete interrupts, (via ioctl) and then * periodic update complete interrupts, (via ioctl) and then
* immediately read /dev/rtc which will block until you get the IRQ. * immediately read /dev/rtc which will block until you get the IRQ.
* Once the read clears, read the RTC time (again via ioctl). Easy. * Once the read clears, read the RTC time (again via ioctl). Easy.
*/ */
@ -1307,8 +1328,7 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
ctrl = CMOS_READ(RTC_CONTROL); ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irqrestore(&rtc_lock, flags); spin_unlock_irqrestore(&rtc_lock, flags);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
{
BCD_TO_BIN(rtc_tm->tm_sec); BCD_TO_BIN(rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_min); BCD_TO_BIN(rtc_tm->tm_min);
BCD_TO_BIN(rtc_tm->tm_hour); BCD_TO_BIN(rtc_tm->tm_hour);
@ -1326,7 +1346,8 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
* Account for differences between how the RTC uses the values * Account for differences between how the RTC uses the values
* and how they are defined in a struct rtc_time; * and how they are defined in a struct rtc_time;
*/ */
if ((rtc_tm->tm_year += (epoch - 1900)) <= 69) rtc_tm->tm_year += epoch - 1900;
if (rtc_tm->tm_year <= 69)
rtc_tm->tm_year += 100; rtc_tm->tm_year += 100;
rtc_tm->tm_mon--; rtc_tm->tm_mon--;
@ -1347,8 +1368,7 @@ static void get_rtc_alm_time(struct rtc_time *alm_tm)
ctrl = CMOS_READ(RTC_CONTROL); ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock); spin_unlock_irq(&rtc_lock);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
{
BCD_TO_BIN(alm_tm->tm_sec); BCD_TO_BIN(alm_tm->tm_sec);
BCD_TO_BIN(alm_tm->tm_min); BCD_TO_BIN(alm_tm->tm_min);
BCD_TO_BIN(alm_tm->tm_hour); BCD_TO_BIN(alm_tm->tm_hour);