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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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dd196a2b3d
This is a simple RTC driver that lets Tilera hardware boot up and set the clock correctly. Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
/*
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* Copyright 2011 Tilera Corporation. All Rights Reserved.
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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, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* Tilera-specific RTC driver.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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/* Platform device pointer. */
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static struct platform_device *tile_rtc_platform_device;
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/*
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* RTC read routine. Gets time info from RTC chip via hypervisor syscall.
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*/
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static int read_rtc_time(struct device *dev, struct rtc_time *tm)
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{
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HV_RTCTime hvtm = hv_get_rtc();
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tm->tm_sec = hvtm.tm_sec;
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tm->tm_min = hvtm.tm_min;
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tm->tm_hour = hvtm.tm_hour;
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tm->tm_mday = hvtm.tm_mday;
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tm->tm_mon = hvtm.tm_mon;
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tm->tm_year = hvtm.tm_year;
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tm->tm_wday = 0;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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if (rtc_valid_tm(tm) < 0)
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dev_warn(dev, "Read invalid date/time from RTC\n");
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return 0;
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}
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/*
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* RTC write routine. Sends time info to hypervisor via syscall, to be
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* written to RTC chip.
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*/
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static int set_rtc_time(struct device *dev, struct rtc_time *tm)
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{
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HV_RTCTime hvtm;
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hvtm.tm_sec = tm->tm_sec;
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hvtm.tm_min = tm->tm_min;
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hvtm.tm_hour = tm->tm_hour;
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hvtm.tm_mday = tm->tm_mday;
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hvtm.tm_mon = tm->tm_mon;
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hvtm.tm_year = tm->tm_year;
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hv_set_rtc(hvtm);
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return 0;
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}
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/*
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* RTC read/write ops.
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*/
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static const struct rtc_class_ops tile_rtc_ops = {
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.read_time = read_rtc_time,
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.set_time = set_rtc_time,
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};
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/*
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* Device probe routine.
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*/
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static int __devinit tile_rtc_probe(struct platform_device *dev)
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{
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struct rtc_device *rtc;
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rtc = rtc_device_register("tile",
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&dev->dev, &tile_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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platform_set_drvdata(dev, rtc);
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return 0;
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}
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/*
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* Device cleanup routine.
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*/
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static int __devexit tile_rtc_remove(struct platform_device *dev)
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{
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struct rtc_device *rtc = platform_get_drvdata(dev);
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if (rtc)
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rtc_device_unregister(rtc);
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platform_set_drvdata(dev, NULL);
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return 0;
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}
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static struct platform_driver tile_rtc_platform_driver = {
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.driver = {
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.name = "rtc-tile",
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.owner = THIS_MODULE,
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},
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.probe = tile_rtc_probe,
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.remove = __devexit_p(tile_rtc_remove),
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};
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/*
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* Driver init routine.
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*/
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static int __init tile_rtc_driver_init(void)
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{
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int err;
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err = platform_driver_register(&tile_rtc_platform_driver);
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if (err)
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return err;
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tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
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if (tile_rtc_platform_device == NULL) {
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err = -ENOMEM;
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goto exit_driver_unregister;
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}
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err = platform_device_add(tile_rtc_platform_device);
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if (err)
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goto exit_device_put;
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return 0;
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exit_device_put:
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platform_device_put(tile_rtc_platform_device);
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exit_driver_unregister:
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platform_driver_unregister(&tile_rtc_platform_driver);
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return err;
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}
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/*
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* Driver cleanup routine.
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*/
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static void __exit tile_rtc_driver_exit(void)
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{
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platform_driver_unregister(&tile_rtc_platform_driver);
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}
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module_init(tile_rtc_driver_init);
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module_exit(tile_rtc_driver_exit);
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MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rtc-tile");
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