374e99d450
Previously the individual xxx_calibrate_decr functions would each print the timebase and cpu frequency and calculate several values such as tb_to_us and tb_to_xs. This moves those printks and calculations into time_init just after the call to the platform's calibrate_decr function. Signed-off-by: Paul Mackerras <paulus@samba.org>
175 lines
4.1 KiB
C
175 lines
4.1 KiB
C
/*
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* Support for periodic interrupts (100 per second) and for getting
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* the current time from the RTC on Power Macintoshes.
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*
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* We use the decrementer register for our periodic interrupts.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996 Paul Mackerras.
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* Copyright (C) 2003-2005 Benjamin Herrenschmidt.
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*
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <asm/sections.h>
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#include <asm/prom.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/time.h>
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#include <asm/nvram.h>
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#include <asm/smu.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(x...) printk(x)
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#else
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#define DBG(x...)
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#endif
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/* Apparently the RTC stores seconds since 1 Jan 1904 */
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#define RTC_OFFSET 2082844800
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/*
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* Calibrate the decrementer frequency with the VIA timer 1.
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*/
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#define VIA_TIMER_FREQ_6 4700000 /* time 1 frequency * 6 */
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extern struct timezone sys_tz;
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extern void to_tm(int tim, struct rtc_time * tm);
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void pmac_get_rtc_time(struct rtc_time *tm)
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{
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switch(sys_ctrler) {
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#ifdef CONFIG_ADB_PMU
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case SYS_CTRLER_PMU: {
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/* TODO: Move that to a function in the PMU driver */
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struct adb_request req;
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unsigned int now;
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if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
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return;
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pmu_wait_complete(&req);
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if (req.reply_len != 4)
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printk(KERN_ERR "pmac_get_rtc_time: PMU returned a %d"
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" bytes reply\n", req.reply_len);
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now = (req.reply[0] << 24) + (req.reply[1] << 16)
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+ (req.reply[2] << 8) + req.reply[3];
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DBG("get: %u -> %u\n", (int)now, (int)(now - RTC_OFFSET));
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now -= RTC_OFFSET;
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to_tm(now, tm);
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tm->tm_year -= 1900;
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tm->tm_mon -= 1;
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DBG("-> tm_mday: %d, tm_mon: %d, tm_year: %d, %d:%02d:%02d\n",
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tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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break;
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}
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#endif /* CONFIG_ADB_PMU */
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#ifdef CONFIG_PMAC_SMU
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case SYS_CTRLER_SMU:
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smu_get_rtc_time(tm, 1);
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break;
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#endif /* CONFIG_PMAC_SMU */
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default:
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;
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}
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}
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int pmac_set_rtc_time(struct rtc_time *tm)
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{
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switch(sys_ctrler) {
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#ifdef CONFIG_ADB_PMU
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case SYS_CTRLER_PMU: {
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/* TODO: Move that to a function in the PMU driver */
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struct adb_request req;
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unsigned int nowtime;
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DBG("set: tm_mday: %d, tm_mon: %d, tm_year: %d,"
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" %d:%02d:%02d\n",
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tm->tm_mday, tm->tm_mon, tm->tm_year,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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nowtime = mktime(tm->tm_year + 1900, tm->tm_mon + 1,
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tm->tm_mday, tm->tm_hour, tm->tm_min,
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tm->tm_sec);
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DBG("-> %u -> %u\n", (int)nowtime,
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(int)(nowtime + RTC_OFFSET));
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nowtime += RTC_OFFSET;
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if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
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nowtime >> 24, nowtime >> 16,
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nowtime >> 8, nowtime) < 0)
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return -ENXIO;
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pmu_wait_complete(&req);
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if (req.reply_len != 0)
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printk(KERN_ERR "pmac_set_rtc_time: PMU returned a %d"
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" bytes reply\n", req.reply_len);
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return 0;
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}
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#endif /* CONFIG_ADB_PMU */
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#ifdef CONFIG_PMAC_SMU
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case SYS_CTRLER_SMU:
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return smu_set_rtc_time(tm, 1);
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#endif /* CONFIG_PMAC_SMU */
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default:
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return -ENODEV;
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}
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}
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unsigned long __init pmac_get_boot_time(void)
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{
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struct rtc_time tm;
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pmac_get_rtc_time(&tm);
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return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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}
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/*
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* Query the OF and get the decr frequency.
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* FIXME: merge this with generic_calibrate_decr
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*/
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void __init pmac_calibrate_decr(void)
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{
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struct device_node *cpu;
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unsigned int *fp;
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/*
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* The cpu node should have a timebase-frequency property
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* to tell us the rate at which the decrementer counts.
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*/
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cpu = find_type_devices("cpu");
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if (cpu == 0)
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panic("can't find cpu node in time_init");
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fp = (unsigned int *) get_property(cpu, "timebase-frequency", NULL);
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if (fp == 0)
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panic("can't get cpu timebase frequency");
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ppc_tb_freq = *fp;
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fp = (unsigned int *)get_property(cpu, "clock-frequency", NULL);
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if (fp == 0)
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panic("can't get cpu processor frequency");
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ppc_proc_freq = *fp;
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}
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