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char/genrtc: remove the rest of the driver

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No architecture uses the genrtc driver any more, so let's kill it off
for good. This now also includes asm-generic/rtc.h, which is otherwise
completely unused.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Arnd Bergmann 2016-05-30 20:58:04 +02:00 committed by Alexandre Belloni
parent f9a8097a83
commit 6705fdb34c
4 changed files with 0 additions and 617 deletions
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26
drivers/char/Kconfig
View File

@ -325,32 +325,6 @@ config JS_RTC
To compile this driver as a module, choose M here: the
module will be called js-rtc.
config OLD_GEN_RTC
tristate "Generic /dev/rtc emulation"
depends on RTC!=y
depends on BROKEN
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
It reports status information via the file /proc/driver/rtc and its
behaviour is set by various ioctls on /dev/rtc. If you enable the
"extended RTC operation" below it will also provide an emulation
for RTC_UIE which is required by some programs and may improve
precision in some cases.
To compile this driver as a module, choose M here: the
module will be called genrtc.
config GEN_RTC_X
bool "Extended RTC operation"
depends on GEN_RTC
help
Provides an emulation for RTC_UIE which is required by some programs
and may improve precision of the generic RTC support in some cases.
config EFI_RTC
bool "EFI Real Time Clock Services"
depends on IA64

1
drivers/char/Makefile
View File

@ -25,7 +25,6 @@ obj-$(CONFIG_APPLICOM) += applicom.o
obj-$(CONFIG_SONYPI) += sonypi.o
obj-$(CONFIG_RTC) += rtc.o
obj-$(CONFIG_HPET) += hpet.o
obj-$(CONFIG_OLD_GEN_RTC) += genrtc.o
obj-$(CONFIG_EFI_RTC) += efirtc.o
obj-$(CONFIG_DS1302) += ds1302.o
obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap/

539
drivers/char/genrtc.c
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@ -1,539 +0,0 @@
/*
* Real Time Clock interface for
* - q40 and other m68k machines,
* - HP PARISC machines
* - PowerPC machines
* emulate some RTC irq capabilities in software
*
* Copyright (C) 1999 Richard Zidlicky
*
* based on Paul Gortmaker's rtc.c device and
* Sam Creasey Generic rtc driver
*
* 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 where
* supported.
*
* 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
* interrupts since the last read in the remaining high bytes. The
* /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.
*
* 1.01 fix for 2.3.X rz@linux-m68k.org
* 1.02 merged with code from genrtc.c rz@linux-m68k.org
* 1.03 make it more portable zippel@linux-m68k.org
* 1.04 removed useless timer code rz@linux-m68k.org
* 1.05 portable RTC_UIE emulation rz@linux-m68k.org
* 1.06 set_rtc_time can return an error trini@kernel.crashing.org
* 1.07 ported to HP PARISC (hppa) Helge Deller <deller@gmx.de>
*/
#define RTC_VERSION "1.07"
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/fcntl.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <asm/uaccess.h>
#include <asm/rtc.h>
/*
* 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 DEFINE_MUTEX(gen_rtc_mutex);
static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
/*
* Bits in gen_rtc_status.
*/
#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
static unsigned char gen_rtc_status; /* bitmapped status byte. */
static unsigned long gen_rtc_irq_data; /* our output to the world */
/* months start at 0 now */
static unsigned char days_in_mo[] =
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static int irq_active;
#ifdef CONFIG_GEN_RTC_X
static struct work_struct genrtc_task;
static struct timer_list timer_task;
static unsigned int oldsecs;
static int lostint;
static unsigned long tt_exp;
static void gen_rtc_timer(unsigned long data);
static volatile int stask_active; /* schedule_work */
static volatile int ttask_active; /* timer_task */
static int stop_rtc_timers; /* don't requeue tasks */
static DEFINE_SPINLOCK(gen_rtc_lock);
static void gen_rtc_interrupt(unsigned long arg);
/*
* Routine to poll RTC seconds field for change as often as possible,
* after first RTC_UIE use timer to reduce polling
*/
static void genrtc_troutine(struct work_struct *work)
{
unsigned int tmp = get_rtc_ss();
if (stop_rtc_timers) {
stask_active = 0;
return;
}
if (oldsecs != tmp){
oldsecs = tmp;
timer_task.function = gen_rtc_timer;
timer_task.expires = jiffies + HZ - (HZ/10);
tt_exp=timer_task.expires;
ttask_active=1;
stask_active=0;
add_timer(&timer_task);
gen_rtc_interrupt(0);
} else if (schedule_work(&genrtc_task) == 0)
stask_active = 0;
}
static void gen_rtc_timer(unsigned long data)
{
lostint = get_rtc_ss() - oldsecs ;
if (lostint<0)
lostint = 60 - lostint;
if (time_after(jiffies, tt_exp))
printk(KERN_INFO "genrtc: timer task delayed by %ld jiffies\n",
jiffies-tt_exp);
ttask_active=0;
stask_active=1;
if ((schedule_work(&genrtc_task) == 0))
stask_active = 0;
}
/*
* call gen_rtc_interrupt function to signal an RTC_UIE,
* arg is unused.
* Could be invoked either from a real interrupt handler or
* from some routine that periodically (eg 100HZ) monitors
* whether RTC_SECS changed
*/
static void gen_rtc_interrupt(unsigned long arg)
{
/* 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. */
gen_rtc_irq_data += 0x100;
gen_rtc_irq_data &= ~0xff;
gen_rtc_irq_data |= RTC_UIE;
if (lostint){
printk("genrtc: system delaying clock ticks?\n");
/* increment count so that userspace knows something is wrong */
gen_rtc_irq_data += ((lostint-1)<<8);
lostint = 0;
}
wake_up_interruptible(&gen_rtc_wait);
}
/*
* Now all the various file operations that we export.
*/
static ssize_t gen_rtc_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long data;
ssize_t retval;
if (count != sizeof (unsigned int) && count != sizeof (unsigned long))
return -EINVAL;
if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
return -EAGAIN;
retval = wait_event_interruptible(gen_rtc_wait,
(data = xchg(&gen_rtc_irq_data, 0)));
if (retval)
goto out;
/* first test allows optimizer to nuke this case for 32-bit machines */
if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
unsigned int uidata = data;
retval = put_user(uidata, (unsigned int __user *)buf) ?:
sizeof(unsigned int);
}
else {
retval = put_user(data, (unsigned long __user *)buf) ?:
sizeof(unsigned long);
}
out:
return retval;
}
static unsigned int gen_rtc_poll(struct file *file,
struct poll_table_struct *wait)
{
poll_wait(file, &gen_rtc_wait, wait);
if (gen_rtc_irq_data != 0)
return POLLIN | POLLRDNORM;
return 0;
}
#endif
/*
* Used to disable/enable interrupts, only RTC_UIE supported
* We also clear out any old irq data after an ioctl() that
* meddles with the interrupt enable/disable bits.
*/
static inline void gen_clear_rtc_irq_bit(unsigned char bit)
{
#ifdef CONFIG_GEN_RTC_X
stop_rtc_timers = 1;
if (ttask_active){
del_timer_sync(&timer_task);
ttask_active = 0;
}
while (stask_active)
schedule();
spin_lock(&gen_rtc_lock);
irq_active = 0;
spin_unlock(&gen_rtc_lock);
#endif
}
static inline int gen_set_rtc_irq_bit(unsigned char bit)
{
#ifdef CONFIG_GEN_RTC_X
spin_lock(&gen_rtc_lock);
if ( !irq_active ) {
irq_active = 1;
stop_rtc_timers = 0;
lostint = 0;
INIT_WORK(&genrtc_task, genrtc_troutine);
oldsecs = get_rtc_ss();
init_timer(&timer_task);
stask_active = 1;
if (schedule_work(&genrtc_task) == 0){
stask_active = 0;
}
}
spin_unlock(&gen_rtc_lock);
gen_rtc_irq_data = 0;
return 0;
#else
return -EINVAL;
#endif
}
static int gen_rtc_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct rtc_time wtime;
struct rtc_pll_info pll;
void __user *argp = (void __user *)arg;
switch (cmd) {
case RTC_PLL_GET:
if (get_rtc_pll(&pll))
return -EINVAL;
else
return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
case RTC_PLL_SET:
if (!capable(CAP_SYS_TIME))
return -EACCES;
if (copy_from_user(&pll, argp, sizeof(pll)))
return -EFAULT;
return set_rtc_pll(&pll);
case RTC_UIE_OFF: /* disable ints from RTC updates. */
gen_clear_rtc_irq_bit(RTC_UIE);
return 0;
case RTC_UIE_ON: /* enable ints for RTC updates. */
return gen_set_rtc_irq_bit(RTC_UIE);
case RTC_RD_TIME: /* Read the time/date from RTC */
/* this doesn't get week-day, who cares */
memset(&wtime, 0, sizeof(wtime));
get_rtc_time(&wtime);
return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
case RTC_SET_TIME: /* Set the RTC */
{
int year;
unsigned char leap_yr;
if (!capable(CAP_SYS_TIME))
return -EACCES;
if (copy_from_user(&wtime, argp, sizeof(wtime)))
return -EFAULT;
year = wtime.tm_year + 1900;
leap_yr = ((!(year % 4) && (year % 100)) ||
!(year % 400));
if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) || (wtime.tm_mday < 1))
return -EINVAL;
if (wtime.tm_mday < 0 || wtime.tm_mday >
(days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr)))
return -EINVAL;
if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
wtime.tm_min < 0 || wtime.tm_min >= 60 ||
wtime.tm_sec < 0 || wtime.tm_sec >= 60)
return -EINVAL;
return set_rtc_time(&wtime);
}
}
return -EINVAL;
}
static long gen_rtc_unlocked_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret;
mutex_lock(&gen_rtc_mutex);
ret = gen_rtc_ioctl(file, cmd, arg);
mutex_unlock(&gen_rtc_mutex);
return ret;
}
/*
* 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.
*/
static int gen_rtc_open(struct inode *inode, struct file *file)
{
mutex_lock(&gen_rtc_mutex);
if (gen_rtc_status & RTC_IS_OPEN) {
mutex_unlock(&gen_rtc_mutex);
return -EBUSY;
}
gen_rtc_status |= RTC_IS_OPEN;
gen_rtc_irq_data = 0;
irq_active = 0;
mutex_unlock(&gen_rtc_mutex);
return 0;
}
static int gen_rtc_release(struct inode *inode, struct file *file)
{
/*
* Turn off all interrupts once the device is no longer
* in use and clear the data.
*/
gen_clear_rtc_irq_bit(RTC_PIE|RTC_AIE|RTC_UIE);
gen_rtc_status &= ~RTC_IS_OPEN;
return 0;
}
#ifdef CONFIG_PROC_FS
/*
* Info exported via "/proc/driver/rtc".
*/
static int gen_rtc_proc_show(struct seq_file *m, void *v)
{
struct rtc_time tm;
unsigned int flags;
struct rtc_pll_info pll;
flags = get_rtc_time(&tm);
seq_printf(m,
"rtc_time\t: %02d:%02d:%02d\n"
"rtc_date\t: %04d-%02d-%02d\n"
"rtc_epoch\t: %04u\n",
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
seq_puts(m, "alarm\t\t: ");
if (tm.tm_hour <= 24)
seq_printf(m, "%02d:", tm.tm_hour);
else
seq_puts(m, "**:");
if (tm.tm_min <= 59)
seq_printf(m, "%02d:", tm.tm_min);
else
seq_puts(m, "**:");
if (tm.tm_sec <= 59)
seq_printf(m, "%02d\n", tm.tm_sec);
else
seq_puts(m, "**\n");
seq_printf(m,
"DST_enable\t: %s\n"
"BCD\t\t: %s\n"
"24hr\t\t: %s\n"
"square_wave\t: %s\n"
"alarm_IRQ\t: %s\n"
"update_IRQ\t: %s\n"
"periodic_IRQ\t: %s\n"
"periodic_freq\t: %ld\n"
"batt_status\t: %s\n",
(flags & RTC_DST_EN) ? "yes" : "no",
(flags & RTC_DM_BINARY) ? "no" : "yes",
(flags & RTC_24H) ? "yes" : "no",
(flags & RTC_SQWE) ? "yes" : "no",
(flags & RTC_AIE) ? "yes" : "no",
irq_active ? "yes" : "no",
(flags & RTC_PIE) ? "yes" : "no",
0L /* freq */,
(flags & RTC_BATT_BAD) ? "bad" : "okay");
if (!get_rtc_pll(&pll))
seq_printf(m,
"PLL adjustment\t: %d\n"
"PLL max +ve adjustment\t: %d\n"
"PLL max -ve adjustment\t: %d\n"
"PLL +ve adjustment factor\t: %d\n"
"PLL -ve adjustment factor\t: %d\n"
"PLL frequency\t: %ld\n",
pll.pll_value,
pll.pll_max,
pll.pll_min,
pll.pll_posmult,
pll.pll_negmult,
pll.pll_clock);
return 0;
}
static int gen_rtc_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, gen_rtc_proc_show, NULL);
}
static const struct file_operations gen_rtc_proc_fops = {
.open = gen_rtc_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init gen_rtc_proc_init(void)
{
struct proc_dir_entry *r;
r = proc_create("driver/rtc", 0, NULL, &gen_rtc_proc_fops);
if (!r)
return -ENOMEM;
return 0;
}
#else
static inline int gen_rtc_proc_init(void) { return 0; }
#endif /* CONFIG_PROC_FS */
/*
* The various file operations we support.
*/
static const struct file_operations gen_rtc_fops = {
.owner = THIS_MODULE,
#ifdef CONFIG_GEN_RTC_X
.read = gen_rtc_read,
.poll = gen_rtc_poll,
#endif
.unlocked_ioctl = gen_rtc_unlocked_ioctl,
.open = gen_rtc_open,
.release = gen_rtc_release,
.llseek = noop_llseek,
};
static struct miscdevice rtc_gen_dev =
{
.minor = RTC_MINOR,
.name = "rtc",
.fops = &gen_rtc_fops,
};
static int __init rtc_generic_init(void)
{
int retval;
printk(KERN_INFO "Generic RTC Driver v%s\n", RTC_VERSION);
retval = misc_register(&rtc_gen_dev);
if (retval < 0)
return retval;
retval = gen_rtc_proc_init();
if (retval) {
misc_deregister(&rtc_gen_dev);
return retval;
}
return 0;
}
static void __exit rtc_generic_exit(void)
{
remove_proc_entry ("driver/rtc", NULL);
misc_deregister(&rtc_gen_dev);
}
module_init(rtc_generic_init);
module_exit(rtc_generic_exit);
MODULE_AUTHOR("Richard Zidlicky");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(RTC_MINOR);

51
include/asm-generic/rtc.h
View File

@ -1,51 +0,0 @@
/*
* include/asm-generic/rtc.h
*
* Author: Tom Rini <trini@mvista.com>
*
* Based on:
* drivers/char/rtc.c
*
* Please read the COPYING file for all license details.
*/
#ifndef __ASM_RTC_H__
#define __ASM_RTC_H__
#include <linux/rtc.h>
#ifndef get_rtc_time
#include <linux/mc146818rtc.h>
#define get_rtc_time mc146818_get_time
#define set_rtc_time mc146818_set_time
#endif
#define RTC_PIE 0x40 /* periodic interrupt enable */
#define RTC_AIE 0x20 /* alarm interrupt enable */
#define RTC_UIE 0x10 /* update-finished interrupt enable */
/* some dummy definitions */
#define RTC_BATT_BAD 0x100 /* battery bad */
#define RTC_SQWE 0x08 /* enable square-wave output */
#define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */
#define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
#define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
static inline unsigned int get_rtc_ss(void)
{
struct rtc_time h;
get_rtc_time(&h);
return h.tm_sec;
}
static inline int get_rtc_pll(struct rtc_pll_info *pll)
{
return -EINVAL;
}
static inline int set_rtc_pll(struct rtc_pll_info *pll)
{
return -EINVAL;
}
#endif /* __ASM_RTC_H__ */