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