/* * PowerNV Real Time Clock. * * Copyright 2011 IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/kernel.h> #include <linux/time.h> #include <linux/bcd.h> #include <linux/rtc.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/of_platform.h> #include <asm/opal.h> #include <asm/firmware.h> #include <asm/machdep.h> static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm) { tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) + bcd2bin((y_m_d >> 16) & 0xff)) - 1900; tm->tm_mon = bcd2bin((y_m_d >> 8) & 0xff) - 1; tm->tm_mday = bcd2bin(y_m_d & 0xff); tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff); tm->tm_min = bcd2bin((h_m_s_ms >> 48) & 0xff); tm->tm_sec = bcd2bin((h_m_s_ms >> 40) & 0xff); GregorianDay(tm); } unsigned long __init opal_get_boot_time(void) { struct rtc_time tm; u32 y_m_d; u64 h_m_s_ms; __be32 __y_m_d; __be64 __h_m_s_ms; long rc = OPAL_BUSY; if (!opal_check_token(OPAL_RTC_READ)) return 0; while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms); if (rc == OPAL_BUSY_EVENT) opal_poll_events(NULL); else mdelay(10); } if (rc != OPAL_SUCCESS) return 0; y_m_d = be32_to_cpu(__y_m_d); h_m_s_ms = be64_to_cpu(__h_m_s_ms); opal_to_tm(y_m_d, h_m_s_ms, &tm); return mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); } static __init int opal_time_init(void) { struct platform_device *pdev; struct device_node *rtc; rtc = of_find_node_by_path("/ibm,opal/rtc"); if (rtc) { pdev = of_platform_device_create(rtc, "opal-rtc", NULL); of_node_put(rtc); } else { if (opal_check_token(OPAL_RTC_READ) || opal_check_token(OPAL_READ_TPO)) pdev = platform_device_register_simple("opal-rtc", -1, NULL, 0); else return -ENODEV; } return PTR_ERR_OR_ZERO(pdev); } machine_subsys_initcall(powernv, opal_time_init);