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dm: rtc: sandbox: Add a driver for the sandbox I2C RTC

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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>
This commit is contained in:
Simon Glass 2015-04-20 12:37:25 -06:00
parent dd18e5d844
commit 5871416640
2 changed files with 109 additions and 0 deletions
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3
drivers/rtc/Makefile
View file

@ -52,4 +52,7 @@ obj-$(CONFIG_RTC_RTC4543) += rtc4543.o
obj-$(CONFIG_RTC_RV3029) += rv3029.o
obj-$(CONFIG_RTC_RX8025) += rx8025.o
obj-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o
ifdef CONFIG_DM_RTC
obj-$(CONFIG_SANDBOX) += sandbox_rtc.o
endif
obj-$(CONFIG_RTC_X1205) += x1205.o

106
drivers/rtc/sandbox_rtc.c Normal file
View file

@ -0,0 +1,106 @@
/*
* (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,
};