98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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/*
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* PowerNV Real Time Clock.
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*
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* Copyright 2011 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/delay.h>
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#include <asm/opal.h>
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#include <asm/firmware.h>
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static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
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{
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tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) +
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bcd2bin((y_m_d >> 16) & 0xff)) - 1900;
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tm->tm_mon = bcd2bin((y_m_d >> 8) & 0xff) - 1;
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tm->tm_mday = bcd2bin(y_m_d & 0xff);
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tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff);
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tm->tm_min = bcd2bin((h_m_s_ms >> 48) & 0xff);
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tm->tm_sec = bcd2bin((h_m_s_ms >> 40) & 0xff);
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GregorianDay(tm);
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}
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unsigned long __init opal_get_boot_time(void)
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{
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struct rtc_time tm;
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u32 y_m_d;
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u64 h_m_s_ms;
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long rc = OPAL_BUSY;
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while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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rc = opal_rtc_read(&y_m_d, &h_m_s_ms);
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if (rc == OPAL_BUSY_EVENT)
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opal_poll_events(NULL);
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else
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mdelay(10);
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}
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if (rc != OPAL_SUCCESS)
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return 0;
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opal_to_tm(y_m_d, h_m_s_ms, &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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void opal_get_rtc_time(struct rtc_time *tm)
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{
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long rc = OPAL_BUSY;
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u32 y_m_d;
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u64 h_m_s_ms;
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while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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rc = opal_rtc_read(&y_m_d, &h_m_s_ms);
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if (rc == OPAL_BUSY_EVENT)
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opal_poll_events(NULL);
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else
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mdelay(10);
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}
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if (rc != OPAL_SUCCESS)
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return;
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opal_to_tm(y_m_d, h_m_s_ms, tm);
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}
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int opal_set_rtc_time(struct rtc_time *tm)
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{
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long rc = OPAL_BUSY;
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u32 y_m_d = 0;
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u64 h_m_s_ms = 0;
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y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
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y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
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y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
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y_m_d |= ((u32)bin2bcd(tm->tm_mday));
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h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
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h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
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h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
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while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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rc = opal_rtc_write(y_m_d, h_m_s_ms);
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if (rc == OPAL_BUSY_EVENT)
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opal_poll_events(NULL);
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else
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mdelay(10);
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}
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return rc == OPAL_SUCCESS ? 0 : -EIO;
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}
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