mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 18:41:03 +00:00
5871416640
Add a driver which communicates with the sandbox I2C emulation RTC device and permits it to be used in U-Boot. This driver is very simple - it just reads and writes selected I2C registers in the device. Signed-off-by: Simon Glass <sjg@chromium.org>
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
|
|
* (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 <i2c.h>
|
|
#include <rtc.h>
|
|
#include <asm/rtc.h>
|
|
|
|
#define REG_COUNT 0x80
|
|
|
|
static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
|
|
{
|
|
time->tm_sec = dm_i2c_reg_read(dev, REG_SEC);
|
|
if (time->tm_sec < 0)
|
|
return time->tm_sec;
|
|
time->tm_min = dm_i2c_reg_read(dev, REG_MIN);
|
|
if (time->tm_min < 0)
|
|
return time->tm_min;
|
|
time->tm_hour = dm_i2c_reg_read(dev, REG_HOUR);
|
|
if (time->tm_hour < 0)
|
|
return time->tm_hour;
|
|
time->tm_mday = dm_i2c_reg_read(dev, REG_MDAY);
|
|
if (time->tm_mday < 0)
|
|
return time->tm_mday;
|
|
time->tm_mon = dm_i2c_reg_read(dev, REG_MON);
|
|
if (time->tm_mon < 0)
|
|
return time->tm_mon;
|
|
time->tm_year = dm_i2c_reg_read(dev, REG_YEAR);
|
|
if (time->tm_year < 0)
|
|
return time->tm_year;
|
|
time->tm_year += 1900;
|
|
time->tm_wday = dm_i2c_reg_read(dev, REG_WDAY);
|
|
if (time->tm_wday < 0)
|
|
return time->tm_wday;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
|
|
{
|
|
int ret;
|
|
|
|
ret = dm_i2c_reg_write(dev, REG_SEC, time->tm_sec);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_MIN, time->tm_min);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_HOUR, time->tm_hour);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_MDAY, time->tm_mday);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_MON, time->tm_mon);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_YEAR, time->tm_year - 1900);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = dm_i2c_reg_write(dev, REG_WDAY, time->tm_wday);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_rtc_reset(struct udevice *dev)
|
|
{
|
|
return dm_i2c_reg_write(dev, REG_RESET, 0);
|
|
}
|
|
|
|
static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
|
|
{
|
|
return dm_i2c_reg_read(dev, reg);
|
|
}
|
|
|
|
static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
|
|
{
|
|
return dm_i2c_reg_write(dev, reg, val);
|
|
}
|
|
|
|
static const struct rtc_ops sandbox_rtc_ops = {
|
|
.get = sandbox_rtc_get,
|
|
.set = sandbox_rtc_set,
|
|
.reset = sandbox_rtc_reset,
|
|
.read8 = sandbox_rtc_read8,
|
|
.write8 = sandbox_rtc_write8,
|
|
};
|
|
|
|
static const struct udevice_id sandbox_rtc_ids[] = {
|
|
{ .compatible = "sandbox-rtc" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rtc_sandbox) = {
|
|
.name = "rtc-sandbox",
|
|
.id = UCLASS_RTC,
|
|
.of_match = sandbox_rtc_ids,
|
|
.ops = &sandbox_rtc_ops,
|
|
};
|