diff options
Diffstat (limited to 'drivers/char/ds1302.c')
| -rw-r--r-- | drivers/char/ds1302.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/drivers/char/ds1302.c b/drivers/char/ds1302.c deleted file mode 100644 index 8e16ad5d6d89..000000000000 --- a/drivers/char/ds1302.c +++ /dev/null @@ -1,357 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/*!*************************************************************************** -*! -*! FILE NAME : ds1302.c -*! -*! DESCRIPTION: Implements an interface for the DS1302 RTC -*! -*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init, get_rtc_status -*! -*! --------------------------------------------------------------------------- -*! -*! (C) Copyright 1999, 2000, 2001 Axis Communications AB, LUND, SWEDEN -*! -*!***************************************************************************/ - - -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/bcd.h> -#include <linux/mutex.h> -#include <linux/uaccess.h> -#include <linux/io.h> - -#include <asm/rtc.h> -#if defined(CONFIG_M32R) -#include <asm/m32r.h> -#endif - -#define RTC_MAJOR_NR 121 /* local major, change later */ - -static DEFINE_MUTEX(rtc_mutex); -static const char ds1302_name[] = "ds1302"; - -/* Send 8 bits. */ -static void -out_byte_rtc(unsigned int reg_addr, unsigned char x) -{ - //RST H - outw(0x0001,(unsigned long)PLD_RTCRSTODT); - //write data - outw(((x<<8)|(reg_addr&0xff)),(unsigned long)PLD_RTCWRDATA); - //WE - outw(0x0002,(unsigned long)PLD_RTCCR); - //wait - while(inw((unsigned long)PLD_RTCCR)); - - //RST L - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - -} - -static unsigned char -in_byte_rtc(unsigned int reg_addr) -{ - unsigned char retval; - - //RST H - outw(0x0001,(unsigned long)PLD_RTCRSTODT); - //write data - outw((reg_addr&0xff),(unsigned long)PLD_RTCRDDATA); - //RE - outw(0x0001,(unsigned long)PLD_RTCCR); - //wait - while(inw((unsigned long)PLD_RTCCR)); - - //read data - retval=(inw((unsigned long)PLD_RTCRDDATA) & 0xff00)>>8; - - //RST L - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - - return retval; -} - -/* Enable writing. */ - -static void -ds1302_wenable(void) -{ - out_byte_rtc(0x8e,0x00); -} - -/* Disable writing. */ - -static void -ds1302_wdisable(void) -{ - out_byte_rtc(0x8e,0x80); -} - - - -/* Read a byte from the selected register in the DS1302. */ - -unsigned char -ds1302_readreg(int reg) -{ - unsigned char x; - - x=in_byte_rtc((0x81 | (reg << 1))); /* read register */ - - return x; -} - -/* Write a byte to the selected register. */ - -void -ds1302_writereg(int reg, unsigned char val) -{ - ds1302_wenable(); - out_byte_rtc((0x80 | (reg << 1)),val); - ds1302_wdisable(); -} - -void -get_rtc_time(struct rtc_time *rtc_tm) -{ - unsigned long flags; - - local_irq_save(flags); - - 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); - - local_irq_restore(flags); - - 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); - - /* - * Account for differences between how the RTC uses the values - * and how they are defined in a struct rtc_time; - */ - - if (rtc_tm->tm_year <= 69) - rtc_tm->tm_year += 100; - - rtc_tm->tm_mon--; -} - -static unsigned char days_in_mo[] = - {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; - -/* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */ - -static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - unsigned long flags; - - switch(cmd) { - case RTC_RD_TIME: /* read the time/date from RTC */ - { - struct rtc_time rtc_tm; - - memset(&rtc_tm, 0, sizeof (struct rtc_time)); - mutex_lock(&rtc_mutex); - get_rtc_time(&rtc_tm); - mutex_unlock(&rtc_mutex); - if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time))) - return -EFAULT; - return 0; - } - - case RTC_SET_TIME: /* set the RTC */ - { - struct rtc_time rtc_tm; - unsigned char mon, day, hrs, min, sec, leap_yr; - unsigned int yrs; - - if (!capable(CAP_SYS_TIME)) - return -EPERM; - - if (copy_from_user(&rtc_tm, (struct rtc_time*)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) || (yrs > 2069)) - 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; - - if ((hrs >= 24) || (min >= 60) || (sec >= 60)) - return -EINVAL; - - if (yrs >= 2000) - yrs -= 2000; /* RTC (0, 1, ... 69) */ - else - yrs -= 1900; /* RTC (70, 71, ... 99) */ - - sec = bin2bcd(sec); - min = bin2bcd(min); - hrs = bin2bcd(hrs); - day = bin2bcd(day); - mon = bin2bcd(mon); - yrs = bin2bcd(yrs); - - mutex_lock(&rtc_mutex); - local_irq_save(flags); - 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); - local_irq_restore(flags); - mutex_unlock(&rtc_mutex); - - /* Notice that at this point, the RTC is updated but - * the kernel is still running with the old time. - * You need to set that separately with settimeofday - * or adjtimex. - */ - return 0; - } - - case RTC_SET_CHARGE: /* set the RTC TRICKLE CHARGE register */ - { - int tcs_val; - - if (!capable(CAP_SYS_TIME)) - return -EPERM; - - if(copy_from_user(&tcs_val, (int*)arg, sizeof(int))) - return -EFAULT; - - mutex_lock(&rtc_mutex); - tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F); - ds1302_writereg(RTC_TRICKLECHARGER, tcs_val); - mutex_unlock(&rtc_mutex); - return 0; - } - default: - return -EINVAL; - } -} - -int -get_rtc_status(char *buf) -{ - char *p; - struct rtc_time tm; - - p = buf; - - 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. - */ - - p += sprintf(p, - "rtc_time\t: %02d:%02d:%02d\n" - "rtc_date\t: %04d-%02d-%02d\n", - tm.tm_hour, tm.tm_min, tm.tm_sec, - tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); - - return p - buf; -} - - -/* The various file operations we support. */ - -static const struct file_operations rtc_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = rtc_ioctl, - .llseek = noop_llseek, -}; - -/* Probe for the chip by writing something to its RAM and try reading it back. */ - -#define MAGIC_PATTERN 0x42 - -static int __init -ds1302_probe(void) -{ - int retval, res, baur; - - baur=(boot_cpu_data.bus_clock/(2*1000*1000)); - - printk("%s: Set PLD_RTCBAUR = %d\n", ds1302_name,baur); - - outw(0x0000,(unsigned long)PLD_RTCCR); - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - outw(baur,(unsigned long)PLD_RTCBAUR); - - /* Try to talk to timekeeper. */ - - ds1302_wenable(); - /* write RAM byte 0 */ - /* write something magic */ - out_byte_rtc(0xc0,MAGIC_PATTERN); - - /* read RAM byte 0 */ - if((res = in_byte_rtc(0xc1)) == MAGIC_PATTERN) { - char buf[100]; - ds1302_wdisable(); - printk("%s: RTC found.\n", ds1302_name); - get_rtc_status(buf); - printk(buf); - retval = 1; - } else { - printk("%s: RTC not found.\n", ds1302_name); - retval = 0; - } - - return retval; -} - - -/* Just probe for the RTC and register the device to handle the ioctl needed. */ - -int __init -ds1302_init(void) -{ - if (!ds1302_probe()) { - return -1; - } - return 0; -} - -static int __init ds1302_register(void) -{ - ds1302_init(); - if (register_chrdev(RTC_MAJOR_NR, ds1302_name, &rtc_fops)) { - printk(KERN_INFO "%s: unable to get major %d for rtc\n", - ds1302_name, RTC_MAJOR_NR); - return -1; - } - return 0; -} - -module_init(ds1302_register); |