1 files changed, 213 insertions, 0 deletions

diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h
new file mode 100644
index 000000000000..cef08db34ada
--- /dev/null
+++ b/include/asm-generic/rtc.h
@@ -0,0 +1,213 @@
+/* 
+ * inclue/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__
+
+#ifdef __KERNEL__
+
+#include <linux/mc146818rtc.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+
+#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 */
+
+/*
+ * Returns true if a clock update is in progress
+ */
+static inline unsigned char rtc_is_updating(void)
+{
+        unsigned char uip;
+
+        spin_lock_irq(&rtc_lock);
+        uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP);
+        spin_unlock_irq(&rtc_lock);
+        return uip;
+}
+
+static inline unsigned int get_rtc_time(struct rtc_time *time)
+{
+        unsigned long uip_watchdog = jiffies;
+        unsigned char ctrl;
+#ifdef CONFIG_MACH_DECSTATION
+        unsigned int real_year;
+#endif
+
+        /*
+         * read RTC once any update in progress is done. The update
+         * can take just over 2ms. We wait 10 to 20ms. There is no need to
+         * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
+         * If you need to know *exactly* when a second has started, enable
+         * periodic update complete interrupts, (via ioctl) and then 
+         * immediately read /dev/rtc which will block until you get the IRQ.
+         * Once the read clears, read the RTC time (again via ioctl). Easy.
+         */
+
+        if (rtc_is_updating() != 0)
+                while (jiffies - uip_watchdog < 2*HZ/100) {
+                        barrier();
+                        cpu_relax();
+                }
+
+        /*
+         * Only the values that we read from the RTC are set. We leave
+         * tm_wday, tm_yday and tm_isdst untouched. Even though the
+         * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
+         * by the RTC when initially set to a non-zero value.
+         */
+        spin_lock_irq(&rtc_lock);
+        time->tm_sec = CMOS_READ(RTC_SECONDS);
+        time->tm_min = CMOS_READ(RTC_MINUTES);
+        time->tm_hour = CMOS_READ(RTC_HOURS);
+        time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
+        time->tm_mon = CMOS_READ(RTC_MONTH);
+        time->tm_year = CMOS_READ(RTC_YEAR);
+#ifdef CONFIG_MACH_DECSTATION
+        real_year = CMOS_READ(RTC_DEC_YEAR);
+#endif
+        ctrl = CMOS_READ(RTC_CONTROL);
+        spin_unlock_irq(&rtc_lock);
+
+        if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+        {
+                BCD_TO_BIN(time->tm_sec);
+                BCD_TO_BIN(time->tm_min);
+                BCD_TO_BIN(time->tm_hour);
+                BCD_TO_BIN(time->tm_mday);
+                BCD_TO_BIN(time->tm_mon);
+                BCD_TO_BIN(time->tm_year);
+        }
+
+#ifdef CONFIG_MACH_DECSTATION
+        time->tm_year += real_year - 72;
+#endif
+
+        /*
+         * Account for differences between how the RTC uses the values
+         * and how they are defined in a struct rtc_time;
+         */
+        if (time->tm_year <= 69)
+                time->tm_year += 100;
+
+        time->tm_mon--;
+
+        return RTC_24H;
+}
+
+/* Set the current date and time in the real time clock. */
+static inline int set_rtc_time(struct rtc_time *time)
+{
+        unsigned char mon, day, hrs, min, sec;
+        unsigned char save_control, save_freq_select;
+        unsigned int yrs;
+#ifdef CONFIG_MACH_DECSTATION
+        unsigned int real_yrs, leap_yr;
+#endif
+
+        yrs = time->tm_year;
+        mon = time->tm_mon + 1;   /* tm_mon starts at zero */
+        day = time->tm_mday;
+        hrs = time->tm_hour;
+        min = time->tm_min;
+        sec = time->tm_sec;
+
+        if (yrs > 255)  /* They are unsigned */
+                return -EINVAL;
+
+        spin_lock_irq(&rtc_lock);
+#ifdef CONFIG_MACH_DECSTATION
+        real_yrs = yrs;
+        leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) ||
+                        !((yrs + 1900) % 400));
+        yrs = 72;
+
+        /*
+         * We want to keep the year set to 73 until March
+         * for non-leap years, so that Feb, 29th is handled
+         * correctly.
+         */
+        if (!leap_yr && mon < 3) {
+                real_yrs--;
+                yrs = 73;
+        }
+#endif
+        /* These limits and adjustments are independent of
+         * whether the chip is in binary mode or not.
+         */
+        if (yrs > 169) {
+                spin_unlock_irq(&rtc_lock);
+                return -EINVAL;
+        }
+
+        if (yrs >= 100)
+                yrs -= 100;
+
+        if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)
+            || RTC_ALWAYS_BCD) {
+                BIN_TO_BCD(sec);
+                BIN_TO_BCD(min);
+                BIN_TO_BCD(hrs);
+                BIN_TO_BCD(day);
+                BIN_TO_BCD(mon);
+                BIN_TO_BCD(yrs);
+        }
+
+        save_control = CMOS_READ(RTC_CONTROL);
+        CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
+        save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
+        CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+#ifdef CONFIG_MACH_DECSTATION
+        CMOS_WRITE(real_yrs, RTC_DEC_YEAR);
+#endif
+        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);
+
+        CMOS_WRITE(save_control, RTC_CONTROL);
+        CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+
+        spin_unlock_irq(&rtc_lock);
+
+        return 0;
+}
+
+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 /* __KERNEL__ */
+#endif /* __ASM_RTC_H__ */