patch-2.4.22 linux-2.4.22/include/asm-arm/arch-riscstation/time.h
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- Lines: 199
- Date:
2003-08-25 04:44:43.000000000 -0700
- Orig file:
linux-2.4.21/include/asm-arm/arch-riscstation/time.h
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/include/asm-arm/arch-riscstation/time.h linux-2.4.22/include/asm-arm/arch-riscstation/time.h
@@ -0,0 +1,198 @@
+/*
+ * linux/include/asm-arm/arch-rs/time.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * (c) 2002 Simtec Electronics / Ben Dooks
+ *
+ * Bits taken from linux/include/asm-arm/arch-rpc/time.h
+ *
+ * (c) 1996-2002 Russell King
+ *
+ * Bits taken from linux/include/asm-arm/arch-ebsa285/time.h
+ *
+ * Copyright (C) 1998 Russell King.
+ * Copyright (C) 1998 Phil Blundell
+*/
+
+#define RTC_PORT(x) (0x70 + (x))
+#define RTC_ALWAYS_BCD (0)
+
+#include <linux/mc146818rtc.h>
+#include <asm/mach-types.h>
+
+extern void ioctime_init(void);
+
+/* timer interrut - update things like profiling information and our
+ * copy of the RTC's time
+*/
+
+static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ do_timer(regs);
+ do_set_rtc();
+ do_profile(regs);
+}
+
+/* get_isa_cmos_time()
+ *
+ * get the time from the CMOS RTC
+ *
+ * from linux/include/asm-arm/arch-ebsa285/time.h
+*/
+
+static unsigned long get_isa_cmos_time(void)
+{
+ unsigned int year, mon, day, hour, min, sec;
+ int i;
+
+ // check to see if the RTC makes sense.....
+ if ((CMOS_READ(RTC_VALID) & RTC_VRT) == 0)
+ return mktime(1970, 1, 1, 0, 0, 0);
+
+ /* The Linux interpretation of the CMOS clock register contents:
+ * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
+ * RTC registers show the second which has precisely just started.
+ * Let's hope other operating systems interpret the RTC the same way.
+ */
+ /* read RTC exactly on falling edge of update flag */
+ for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
+ if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
+ break;
+
+ for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
+ if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
+ break;
+
+ do { /* Isn't this overkill ? UIP above should guarantee consistency */
+ sec = CMOS_READ(RTC_SECONDS);
+ min = CMOS_READ(RTC_MINUTES);
+ hour = CMOS_READ(RTC_HOURS);
+ day = CMOS_READ(RTC_DAY_OF_MONTH);
+ mon = CMOS_READ(RTC_MONTH);
+ year = CMOS_READ(RTC_YEAR);
+ } while (sec != CMOS_READ(RTC_SECONDS));
+
+ if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ BCD_TO_BIN(sec);
+ BCD_TO_BIN(min);
+ BCD_TO_BIN(hour);
+ BCD_TO_BIN(day);
+ BCD_TO_BIN(mon);
+ BCD_TO_BIN(year);
+ }
+ if ((year += 1900) < 1970)
+ year += 100;
+ return mktime(year, mon, day, hour, min, sec);
+}
+
+/* set_isa_cmos_time()
+ *
+ * set the CMOS RTC time
+ *
+ * from linux/include/asm-arm/arch-ebsa285/time.h
+*/
+
+static int
+set_isa_cmos_time(void)
+{
+ int retval = 0;
+ int real_seconds, real_minutes, cmos_minutes;
+ unsigned char save_control, save_freq_select;
+ unsigned long nowtime = xtime.tv_sec;
+
+ save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
+ CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
+
+ save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
+ CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+ cmos_minutes = CMOS_READ(RTC_MINUTES);
+ if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+ BCD_TO_BIN(cmos_minutes);
+
+ /*
+ * since we're only adjusting minutes and seconds,
+ * don't interfere with hour overflow. This avoids
+ * messing with unknown time zones but requires your
+ * RTC not to be off by more than 15 minutes
+ */
+ real_seconds = nowtime % 60;
+ real_minutes = nowtime / 60;
+ if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
+ real_minutes += 30; /* correct for half hour time zone */
+ real_minutes %= 60;
+
+ if (abs(real_minutes - cmos_minutes) < 30) {
+ if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ BIN_TO_BCD(real_seconds);
+ BIN_TO_BCD(real_minutes);
+ }
+ CMOS_WRITE(real_seconds,RTC_SECONDS);
+ CMOS_WRITE(real_minutes,RTC_MINUTES);
+ } else
+ retval = -1;
+
+ /* The following flags have to be released exactly in this order,
+ * otherwise the DS12887 (popular MC146818A clone with integrated
+ * battery and quartz) will not reset the oscillator and will not
+ * update precisely 500 ms later. You won't find this mentioned in
+ * the Dallas Semiconductor data sheets, but who believes data
+ * sheets anyway ... -- Markus Kuhn
+ */
+ CMOS_WRITE(save_control, RTC_CONTROL);
+ CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+
+ return retval;
+}
+
+
+/*
+ * Set up timer interrupt.
+ */
+static inline void setup_timer(void)
+{
+ int reg_b, reg_d;
+
+ ioctime_init();
+
+ /* ensure we have an RTC chip, and initialise it... */
+
+ reg_d = CMOS_READ(RTC_REG_D);
+
+ CMOS_WRITE(RTC_REF_CLCK_32KHZ, RTC_REG_A);
+
+ /*
+ * Set control reg B
+ * (24 hour mode, update enabled)
+ */
+ reg_b = CMOS_READ(RTC_REG_B) & 0x7f;
+ reg_b |= 2;
+ CMOS_WRITE(reg_b, RTC_REG_B);
+
+ if ((CMOS_READ(RTC_REG_A) & 0x7f) == RTC_REF_CLCK_32KHZ &&
+ CMOS_READ(RTC_REG_B) == reg_b) {
+
+ /*
+ * We have a RTC. Check the battery
+ */
+ if ((reg_d & 0x80) == 0)
+ printk(KERN_WARNING "RTC: *** warning: CMOS battery bad\n");
+
+ printk("RTC: detected\n");
+
+ xtime.tv_sec = get_isa_cmos_time();
+ set_rtc = set_isa_cmos_time;
+ } else {
+ printk("RTC: Warning: No RTC detected\n");
+ }
+
+ /* ensure we have the IOC time interrupt setup */
+
+ timer_irq.handler = timer_interrupt;
+
+ setup_arm_irq(IRQ_TIMER, &timer_irq);
+}
+
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