linux/drivers/rtc/rtc-starfire.c
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   1/* rtc-starfire.c: Starfire platform RTC driver.
   2 *
   3 * Author: David S. Miller
   4 * License: GPL
   5 *
   6 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/init.h>
  11#include <linux/rtc.h>
  12#include <linux/platform_device.h>
  13
  14#include <asm/oplib.h>
  15
  16static u32 starfire_get_time(void)
  17{
  18        static char obp_gettod[32];
  19        static u32 unix_tod;
  20
  21        sprintf(obp_gettod, "h# %08x unix-gettod",
  22                (unsigned int) (long) &unix_tod);
  23        prom_feval(obp_gettod);
  24
  25        return unix_tod;
  26}
  27
  28static int starfire_read_time(struct device *dev, struct rtc_time *tm)
  29{
  30        rtc_time64_to_tm(starfire_get_time(), tm);
  31        return 0;
  32}
  33
  34static const struct rtc_class_ops starfire_rtc_ops = {
  35        .read_time      = starfire_read_time,
  36};
  37
  38static int __init starfire_rtc_probe(struct platform_device *pdev)
  39{
  40        struct rtc_device *rtc;
  41
  42        rtc = devm_rtc_allocate_device(&pdev->dev);
  43        if (IS_ERR(rtc))
  44                return PTR_ERR(rtc);
  45
  46        rtc->ops = &starfire_rtc_ops;
  47        rtc->range_max = U32_MAX;
  48
  49        platform_set_drvdata(pdev, rtc);
  50
  51        return devm_rtc_register_device(rtc);
  52}
  53
  54static struct platform_driver starfire_rtc_driver = {
  55        .driver         = {
  56                .name   = "rtc-starfire",
  57        },
  58};
  59
  60builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);
  61