+++ /dev/null
-/* $Id: rtc.c,v 1.28 2001/10/08 22:19:51 davem Exp $
- *
- * Linux/SPARC Real Time Clock Driver
- * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
- *
- * This is a little driver that lets a user-level program access
- * the SPARC Mostek real time clock chip. It is no use unless you
- * use the modified clock utility.
- *
- * Get the modified clock utility from:
- * ftp://vger.kernel.org/pub/linux/Sparc/userland/clock.c
- */
-
-#include <linux/module.h>
-#include <linux/smp_lock.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/miscdevice.h>
-#include <linux/slab.h>
-#include <linux/fcntl.h>
-#include <linux/poll.h>
-#include <linux/init.h>
-#include <asm/io.h>
-#include <asm/mostek.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/rtc.h>
-
-static int rtc_busy = 0;
-
-/* This is the structure layout used by drivers/char/rtc.c, we
- * support that driver's ioctls so that things are less messy in
- * userspace.
- */
-struct rtc_time_generic {
- int tm_sec;
- int tm_min;
- int tm_hour;
- int tm_mday;
- int tm_mon;
- int tm_year;
- int tm_wday;
- int tm_yday;
- int tm_isdst;
-};
-#define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
-#define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
-#define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
-#define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
-#define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
-#define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
-#define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */
-#define RTC_WIE_OFF _IO('p', 0x10) /* ... off */
-#define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time_generic) /* Read RTC time */
-#define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time_generic) /* Set RTC time */
-#define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */
-#define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
-#define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */
-#define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */
-#define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */
-#define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */
-#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
-#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
-#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
-#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
-
-/* Retrieve the current date and time from the real time clock. */
-static void get_rtc_time(struct rtc_time *t)
-{
- void __iomem *regs = mstk48t02_regs;
- u8 tmp;
-
- spin_lock_irq(&mostek_lock);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_READ;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- t->sec = MSTK_REG_SEC(regs);
- t->min = MSTK_REG_MIN(regs);
- t->hour = MSTK_REG_HOUR(regs);
- t->dow = MSTK_REG_DOW(regs);
- t->dom = MSTK_REG_DOM(regs);
- t->month = MSTK_REG_MONTH(regs);
- t->year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_READ;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-}
-
-/* Set the current date and time inthe real time clock. */
-void set_rtc_time(struct rtc_time *t)
-{
- void __iomem *regs = mstk48t02_regs;
- u8 tmp;
-
- spin_lock_irq(&mostek_lock);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- MSTK_SET_REG_SEC(regs,t->sec);
- MSTK_SET_REG_MIN(regs,t->min);
- MSTK_SET_REG_HOUR(regs,t->hour);
- MSTK_SET_REG_DOW(regs,t->dow);
- MSTK_SET_REG_DOM(regs,t->dom);
- MSTK_SET_REG_MONTH(regs,t->month);
- MSTK_SET_REG_YEAR(regs,t->year - MSTK_YEAR_ZERO);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-}
-
-static int put_rtc_time_generic(void __user *argp, struct rtc_time *tm)
-{
- struct rtc_time_generic __user *utm = argp;
-
- if (__put_user(tm->sec, &utm->tm_sec) ||
- __put_user(tm->min, &utm->tm_min) ||
- __put_user(tm->hour, &utm->tm_hour) ||
- __put_user(tm->dom, &utm->tm_mday) ||
- __put_user(tm->month, &utm->tm_mon) ||
- __put_user(tm->year, &utm->tm_year) ||
- __put_user(tm->dow, &utm->tm_wday) ||
- __put_user(0, &utm->tm_yday) ||
- __put_user(0, &utm->tm_isdst))
- return -EFAULT;
-
- return 0;
-}
-
-static int get_rtc_time_generic(struct rtc_time *tm, void __user *argp)
-{
- struct rtc_time_generic __user *utm = argp;
-
- if (__get_user(tm->sec, &utm->tm_sec) ||
- __get_user(tm->min, &utm->tm_min) ||
- __get_user(tm->hour, &utm->tm_hour) ||
- __get_user(tm->dom, &utm->tm_mday) ||
- __get_user(tm->month, &utm->tm_mon) ||
- __get_user(tm->year, &utm->tm_year) ||
- __get_user(tm->dow, &utm->tm_wday))
- return -EFAULT;
-
- return 0;
-}
-
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct rtc_time rtc_tm;
- void __user *argp = (void __user *)arg;
-
- switch (cmd) {
- /* No interrupt support, return an error
- * compatible with drivers/char/rtc.c
- */
- 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:
- case RTC_EPOCH_SET:
- case RTC_EPOCH_READ:
- return -EINVAL;
-
- case RTCGET:
- case RTC_RD_TIME:
- memset(&rtc_tm, 0, sizeof(struct rtc_time));
- get_rtc_time(&rtc_tm);
-
- if (cmd == RTCGET) {
- if (copy_to_user(argp, &rtc_tm,
- sizeof(struct rtc_time)))
- return -EFAULT;
- } else if (put_rtc_time_generic(argp, &rtc_tm))
- return -EFAULT;
-
- return 0;
-
-
- case RTCSET:
- case RTC_SET_TIME:
- if (!capable(CAP_SYS_TIME))
- return -EPERM;
-
- if (cmd == RTCSET) {
- if (copy_from_user(&rtc_tm, argp,
- sizeof(struct rtc_time)))
- return -EFAULT;
- } else if (get_rtc_time_generic(&rtc_tm, argp))
- return -EFAULT;
-
- set_rtc_time(&rtc_tm);
-
- return 0;
-
- default:
- return -EINVAL;
- }
-}
-
-static int rtc_open(struct inode *inode, struct file *file)
-{
- int ret;
-
- lock_kernel();
- spin_lock_irq(&mostek_lock);
- if (rtc_busy) {
- ret = -EBUSY;
- } else {
- rtc_busy = 1;
- ret = 0;
- }
- spin_unlock_irq(&mostek_lock);
- unlock_kernel();
-
- return ret;
-}
-
-static int rtc_release(struct inode *inode, struct file *file)
-{
- rtc_busy = 0;
-
- return 0;
-}
-
-static const struct file_operations rtc_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .ioctl = rtc_ioctl,
- .open = rtc_open,
- .release = rtc_release,
-};
-
-static struct miscdevice rtc_dev = { RTC_MINOR, "rtc", &rtc_fops };
-
-static int __init rtc_sun_init(void)
-{
- int error;
-
- /* It is possible we are being driven by some other RTC chip
- * and thus another RTC driver is handling things.
- */
- if (!mstk48t02_regs)
- return -ENODEV;
-
- error = misc_register(&rtc_dev);
- if (error) {
- printk(KERN_ERR "rtc: unable to get misc minor for Mostek\n");
- return error;
- }
- printk("rtc_sun_init: Registered Mostek RTC driver.\n");
-
- return 0;
-}
-
-static void __exit rtc_sun_cleanup(void)
-{
- misc_deregister(&rtc_dev);
-}
-
-module_init(rtc_sun_init);
-module_exit(rtc_sun_cleanup);
-MODULE_LICENSE("GPL");
projects / linux-2.6-omap-h63xx.git / commitdiff