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daed1285c3
Not all I/O ASIC versions have the free-running counter implemented, an early revision used in the 5000/1xx models aka 3MIN and 4MIN did not have it. Therefore we cannot unconditionally use it as a clock source. Fortunately if not implemented its register slot has a fixed value so it is enough if we check for the value at the end of the calibration period being the same as at the beginning. This also means we need to look for another high-precision clock source on the systems affected. The 5000/1xx can have an R4000SC processor installed where the CP0 Count register can be used as a clock source. Unfortunately all the R4k DECstations suffer from the missed timer interrupt on CP0 Count reads erratum, so we cannot use the CP0 timer as a clock source and a clock event both at a time. However we never need an R4k clock event device because all DECstations have a DS1287A RTC chip whose periodic interrupt can be used as a clock source. This gives us the following four configuration possibilities for I/O ASIC DECstations: 1. No I/O ASIC counter and no CP0 timer, e.g. R3k 5000/1xx (3MIN). 2. No I/O ASIC counter but the CP0 timer, i.e. R4k 5000/150 (4MIN). 3. The I/O ASIC counter but no CP0 timer, e.g. R3k 5000/240 (3MAX+). 4. The I/O ASIC counter and the CP0 timer, e.g. R4k 5000/260 (4MAX+). For #1 and #2 this change stops the I/O ASIC free-running counter from being installed as a clock source of a 0Hz frequency. For #2 it also arranges for the CP0 timer to be used as a clock source rather than a clock event device, because having an accurate wall clock is more important than a high-precision interval timer. For #3 there is no change. For #4 the change makes the I/O ASIC free-running counter installed as a clock source so that the CP0 timer can be used as a clock event device. Unfortunately the use of the CP0 timer as a clock event device relies on a succesful completion of c0_compare_interrupt. That never happens, because while waiting for a CP0 Compare interrupt to happen the function spins in a loop reading the CP0 Count register. This makes the CP0 Count erratum trigger reliably causing the interrupt waited for to be lost in all cases. As a result #4 resorts to using the CP0 timer as a clock source as well, just as #2. However we want to keep this separate arrangement in case (hope) c0_compare_interrupt is eventually rewritten such that it avoids the erratum. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5825/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
172 lines
4.7 KiB
C
172 lines
4.7 KiB
C
/*
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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* Copyright (C) 2000, 2003 Maciej W. Rozycki
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*
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* This file contains the time handling details for PC-style clocks as
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* found in some MIPS systems.
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*
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*/
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#include <linux/bcd.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <linux/param.h>
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#include <asm/cpu-features.h>
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#include <asm/ds1287.h>
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#include <asm/time.h>
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#include <asm/dec/interrupts.h>
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#include <asm/dec/ioasic.h>
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#include <asm/dec/machtype.h>
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void read_persistent_clock(struct timespec *ts)
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{
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unsigned int year, mon, day, hour, min, sec, real_year;
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unsigned long flags;
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spin_lock_irqsave(&rtc_lock, flags);
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do {
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sec = CMOS_READ(RTC_SECONDS);
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min = CMOS_READ(RTC_MINUTES);
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hour = CMOS_READ(RTC_HOURS);
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day = CMOS_READ(RTC_DAY_OF_MONTH);
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mon = CMOS_READ(RTC_MONTH);
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year = CMOS_READ(RTC_YEAR);
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/*
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* The PROM will reset the year to either '72 or '73.
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* Therefore we store the real year separately, in one
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* of unused BBU RAM locations.
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*/
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real_year = CMOS_READ(RTC_DEC_YEAR);
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} while (sec != CMOS_READ(RTC_SECONDS));
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spin_unlock_irqrestore(&rtc_lock, flags);
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if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
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sec = bcd2bin(sec);
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min = bcd2bin(min);
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hour = bcd2bin(hour);
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day = bcd2bin(day);
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mon = bcd2bin(mon);
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year = bcd2bin(year);
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}
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year += real_year - 72 + 2000;
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ts->tv_sec = mktime(year, mon, day, hour, min, sec);
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ts->tv_nsec = 0;
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}
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/*
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* In order to set the CMOS clock precisely, rtc_mips_set_mmss has to
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* be called 500 ms after the second nowtime has started, because when
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* nowtime is written into the registers of the CMOS clock, it will
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* jump to the next second precisely 500 ms later. Check the Dallas
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* DS1287 data sheet for details.
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*/
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int rtc_mips_set_mmss(unsigned long nowtime)
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{
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int retval = 0;
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int real_seconds, real_minutes, cmos_minutes;
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unsigned char save_control, save_freq_select;
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/* irq are locally disabled here */
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spin_lock(&rtc_lock);
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/* tell the clock it's being set */
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save_control = CMOS_READ(RTC_CONTROL);
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CMOS_WRITE((save_control | RTC_SET), RTC_CONTROL);
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/* stop and reset prescaler */
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save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
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CMOS_WRITE((save_freq_select | RTC_DIV_RESET2), RTC_FREQ_SELECT);
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cmos_minutes = CMOS_READ(RTC_MINUTES);
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if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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cmos_minutes = bcd2bin(cmos_minutes);
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/*
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* since we're only adjusting minutes and seconds,
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* don't interfere with hour overflow. This avoids
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* messing with unknown time zones but requires your
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* RTC not to be off by more than 15 minutes
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*/
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real_seconds = nowtime % 60;
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real_minutes = nowtime / 60;
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if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)
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real_minutes += 30; /* correct for half hour time zone */
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real_minutes %= 60;
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if (abs(real_minutes - cmos_minutes) < 30) {
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if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
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real_seconds = bin2bcd(real_seconds);
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real_minutes = bin2bcd(real_minutes);
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}
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CMOS_WRITE(real_seconds, RTC_SECONDS);
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CMOS_WRITE(real_minutes, RTC_MINUTES);
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} else {
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printk_once(KERN_NOTICE
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"set_rtc_mmss: can't update from %d to %d\n",
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cmos_minutes, real_minutes);
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retval = -1;
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}
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/* The following flags have to be released exactly in this order,
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* otherwise the DS1287 will not reset the oscillator and will not
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* update precisely 500 ms later. You won't find this mentioned
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* in the Dallas Semiconductor data sheets, but who believes data
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* sheets anyway ... -- Markus Kuhn
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*/
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CMOS_WRITE(save_control, RTC_CONTROL);
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CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
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spin_unlock(&rtc_lock);
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return retval;
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}
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void __init plat_time_init(void)
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{
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int ioasic_clock = 0;
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u32 start, end;
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int i = HZ / 8;
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/* Set up the rate of periodic DS1287 interrupts. */
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ds1287_set_base_clock(HZ);
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/* On some I/O ASIC systems we have the I/O ASIC's counter. */
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if (IOASIC)
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ioasic_clock = dec_ioasic_clocksource_init() == 0;
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if (cpu_has_counter) {
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ds1287_timer_state();
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while (!ds1287_timer_state())
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;
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start = read_c0_count();
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while (i--)
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while (!ds1287_timer_state())
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;
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end = read_c0_count();
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mips_hpt_frequency = (end - start) * 8;
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printk(KERN_INFO "MIPS counter frequency %dHz\n",
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mips_hpt_frequency);
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/*
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* All R4k DECstations suffer from the CP0 Count erratum,
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* so we can't use the timer as a clock source, and a clock
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* event both at a time. An accurate wall clock is more
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* important than a high-precision interval timer so only
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* use the timer as a clock source, and not a clock event
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* if there's no I/O ASIC counter available to serve as a
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* clock source.
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*/
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if (!ioasic_clock) {
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init_r4k_clocksource();
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mips_hpt_frequency = 0;
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}
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}
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ds1287_clockevent_init(dec_interrupt[DEC_IRQ_RTC]);
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}
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