u-boot/drivers/rtc/rtc-uclass.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#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;
}

UCLASS_DRIVER(rtc) = {
	.name		= "rtc",
	.id		= UCLASS_RTC,
};