text: /*
   * (C) Copyright 2015 Google, Inc
   * Written by Simon Glass <sjg@chromium.org>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <dm.h>
  #include <errno.h>
  #include <rtc.h>
  
  int dm_rtc_get(struct udevice *dev, struct rtc_time *time)
  {
  	struct rtc_ops *ops = rtc_get_ops(dev);
  
  	assert(ops);
  	if (!ops->get)
  		return -ENOSYS;
  	return ops->get(dev, time);
  }
  
  int dm_rtc_set(struct udevice *dev, struct rtc_time *time)
  {
  	struct rtc_ops *ops = rtc_get_ops(dev);
  
  	assert(ops);
  	if (!ops->set)
  		return -ENOSYS;
  	return ops->set(dev, time);
  }
  
  int dm_rtc_reset(struct udevice *dev)
  {
  	struct rtc_ops *ops = rtc_get_ops(dev);
  
  	assert(ops);
  	if (!ops->reset)
  		return -ENOSYS;
  	return ops->reset(dev);
  }
  
  int rtc_read8(struct udevice *dev, unsigned int reg)
  {
  	struct rtc_ops *ops = rtc_get_ops(dev);
  
  	assert(ops);
  	if (!ops->read8)
  		return -ENOSYS;
  	return ops->read8(dev, reg);
  }
  
  int rtc_write8(struct udevice *dev, unsigned int reg, int val)
  {
  	struct rtc_ops *ops = rtc_get_ops(dev);
  
  	assert(ops);
  	if (!ops->write8)
  		return -ENOSYS;
  	return ops->write8(dev, reg, val);
  }
  
  int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep)
  {
  	u16 value = 0;
  	int ret;
  	int i;
  
  	for (i = 0; i < sizeof(value); i++) {
  		ret = rtc_read8(dev, reg + i);
  		if (ret < 0)
  			return ret;
  		value |= ret << (i << 3);
  	}
  
  	*valuep = value;
  	return 0;
  }
  
  int rtc_write16(struct udevice *dev, unsigned int reg, u16 value)
  {
  	int i, ret;
  
  	for (i = 0; i < sizeof(value); i++) {
  		ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
  		if (ret)
  			return ret;
  	}
  
  	return 0;
  }
  
  int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep)
  {
  	u32 value = 0;
  	int ret;
  	int i;
  
  	for (i = 0; i < sizeof(value); i++) {
  		ret = rtc_read8(dev, reg + i);
  		if (ret < 0)
  			return ret;
  		value |= ret << (i << 3);
  	}
  
  	*valuep = value;
  	return 0;
  }
  
  int rtc_write32(struct udevice *dev, unsigned int reg, u32 value)
  {
  	int i, ret;
  
  	for (i = 0; i < sizeof(value); i++) {
  		ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
  		if (ret)
  			return ret;
  	}
  
  	return 0;
  }
  
  int rtc_alarm_trigger(struct udevice *dev)
  {
  	const struct rtc_ops *ops = dev_get_driver_ops(dev);
  
  	if (!ops || !ops->alarm_trigger)
  		return 0;
  
  	return ops->alarm_trigger(dev);
  }
  
  UCLASS_DRIVER(rtc) = {
  	.name		= "rtc",
  	.id		= UCLASS_RTC,
  };
  