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https://github.com/AsahiLinux/u-boot
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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
/*
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* (C) Copyright 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <rtc.h>
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#include <asm/rtc.h>
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#define REG_COUNT 0x80
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static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
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{
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time->tm_sec = dm_i2c_reg_read(dev, REG_SEC);
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if (time->tm_sec < 0)
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return time->tm_sec;
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time->tm_min = dm_i2c_reg_read(dev, REG_MIN);
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if (time->tm_min < 0)
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return time->tm_min;
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time->tm_hour = dm_i2c_reg_read(dev, REG_HOUR);
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if (time->tm_hour < 0)
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return time->tm_hour;
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time->tm_mday = dm_i2c_reg_read(dev, REG_MDAY);
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if (time->tm_mday < 0)
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return time->tm_mday;
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time->tm_mon = dm_i2c_reg_read(dev, REG_MON);
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if (time->tm_mon < 0)
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return time->tm_mon;
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time->tm_year = dm_i2c_reg_read(dev, REG_YEAR);
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if (time->tm_year < 0)
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return time->tm_year;
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time->tm_year += 1900;
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time->tm_wday = dm_i2c_reg_read(dev, REG_WDAY);
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if (time->tm_wday < 0)
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return time->tm_wday;
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return 0;
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}
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static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
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{
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int ret;
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ret = dm_i2c_reg_write(dev, REG_SEC, time->tm_sec);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_MIN, time->tm_min);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_HOUR, time->tm_hour);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_MDAY, time->tm_mday);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_MON, time->tm_mon);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_YEAR, time->tm_year - 1900);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, REG_WDAY, time->tm_wday);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int sandbox_rtc_reset(struct udevice *dev)
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{
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return dm_i2c_reg_write(dev, REG_RESET, 0);
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}
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static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
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{
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return dm_i2c_reg_read(dev, reg);
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}
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static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
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{
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return dm_i2c_reg_write(dev, reg, val);
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}
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static const struct rtc_ops sandbox_rtc_ops = {
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.get = sandbox_rtc_get,
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.set = sandbox_rtc_set,
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.reset = sandbox_rtc_reset,
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.read8 = sandbox_rtc_read8,
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.write8 = sandbox_rtc_write8,
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};
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static const struct udevice_id sandbox_rtc_ids[] = {
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{ .compatible = "sandbox-rtc" },
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{ }
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};
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U_BOOT_DRIVER(rtc_sandbox) = {
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.name = "rtc-sandbox",
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.id = UCLASS_RTC,
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.of_match = sandbox_rtc_ids,
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.ops = &sandbox_rtc_ops,
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};
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