Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/char/ds1302.c b/drivers/char/ds1302.c
new file mode 100644
index 000000000000..a75e8609be01
--- /dev/null
+++ b/drivers/char/ds1302.c
@@ -0,0 +1,354 @@
+/*!***************************************************************************
+*!
+*! 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/config.h>
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+#include <linux/delay.h>
+#include <linux/bcd.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/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 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);
+        local_irq_disable();
+
+        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);
+
+        BCD_TO_BIN(rtc_tm->tm_sec);
+        BCD_TO_BIN(rtc_tm->tm_min);
+        BCD_TO_BIN(rtc_tm->tm_hour);
+        BCD_TO_BIN(rtc_tm->tm_mday);
+        BCD_TO_BIN(rtc_tm->tm_mon);
+        BCD_TO_BIN(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 int
+rtc_ioctl(struct inode *inode, 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));
+                        get_rtc_time(&rtc_tm);
+                        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) */
+
+                        BIN_TO_BCD(sec);
+                        BIN_TO_BCD(min);
+                        BIN_TO_BCD(hrs);
+                        BIN_TO_BCD(day);
+                        BIN_TO_BCD(mon);
+                        BIN_TO_BCD(yrs);
+
+                        local_irq_save(flags);
+                        local_irq_disable();
+                        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);
+
+                        /* 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;
+
+                        tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
+                        ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
+                        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 struct file_operations rtc_fops = {
+        .owner          = THIS_MODULE,
+        .ioctl          = rtc_ioctl,
+};
+
+/* 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);