mirror of
https://github.com/u-boot/u-boot.git
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0ba121668c
Add compatible strings used by Linux. Allows for simpler syncing of device trees. Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
367 lines
7.9 KiB
C
367 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SII Semiconductor Corporation S35392A RTC driver.
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*
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* Copyright (c) 2017, General Electric Company
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <command.h>
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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 <linux/bitrev.h>
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#include <rtc.h>
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#define S35390A_CMD_STATUS1 0x30
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#define S35390A_CMD_STATUS2 0x31
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#define S35390A_CMD_TIME1 0x32
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#define S35390A_CMD_TIME2 0x33
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#define S35390A_CMD_INT2_REG1 0x35
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#define S35390A_BYTE_YEAR 0
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#define S35390A_BYTE_MONTH 1
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#define S35390A_BYTE_DAY 2
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#define S35390A_BYTE_WDAY 3
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#define S35390A_BYTE_HOURS 4
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#define S35390A_BYTE_MINS 5
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#define S35390A_BYTE_SECS 6
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/* flags for STATUS1 */
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#define S35390A_FLAG_POC 0x01
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#define S35390A_FLAG_BLD 0x02
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#define S35390A_FLAG_INT2 0x04
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#define S35390A_FLAG_24H 0x40
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#define S35390A_FLAG_RESET 0x80
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/*
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* If either BLD or POC is set, then the chip has lost power long enough for
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* the time value to become invalid.
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*/
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#define S35390A_LOW_VOLTAGE (S35390A_FLAG_POC | S35390A_FLAG_BLD)
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/*---------------------------------------------------------------------*/
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#undef DEBUG_RTC
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#ifdef DEBUG_RTC
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#define DEBUGR(fmt, args...) printf(fmt, ##args)
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#else
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#define DEBUGR(fmt, args...)
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#endif
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/*---------------------------------------------------------------------*/
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#ifdef CONFIG_DM_RTC
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#define DEV_TYPE struct udevice
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#else
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/* Local udevice */
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struct ludevice {
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u8 chip;
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};
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#define DEV_TYPE struct ludevice
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struct ludevice dev;
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#endif
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#define msleep(a) udelay(a * 1000)
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int lowvoltage;
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static int s35392a_rtc_reset(DEV_TYPE *dev);
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static int s35392a_rtc_read(DEV_TYPE *dev, u8 reg, u8 *buf, int len)
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{
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int ret;
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#ifdef CONFIG_DM_RTC
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/* TODO: we need to tweak the chip address to reg */
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ret = dm_i2c_read(dev, 0, buf, len);
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#else
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(void)dev;
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ret = i2c_read(reg, 0, -1, buf, len);
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#endif
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return ret;
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}
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static int s35392a_rtc_write(DEV_TYPE *dev, u8 reg, u8 *buf, int len)
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{
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int ret;
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#ifdef CONFIG_DM_RTC
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/* TODO: we need to tweak the chip address to reg */
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ret = dm_i2c_write(dev, 0, buf, 1);
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#else
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(void)dev;
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ret = i2c_write(reg, 0, 0, buf, len);
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#endif
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return ret;
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}
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static int s35392a_rtc_read8(DEV_TYPE *dev, unsigned int reg)
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{
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u8 val;
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int ret;
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ret = s35392a_rtc_read(dev, reg, &val, sizeof(val));
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return ret < 0 ? ret : val;
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}
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static int s35392a_rtc_write8(DEV_TYPE *dev, unsigned int reg, int val)
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{
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int ret;
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u8 lval = val;
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ret = s35392a_rtc_write(dev, reg, &lval, sizeof(lval));
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return ret < 0 ? ret : 0;
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}
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static int validate_time(const struct rtc_time *tm)
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{
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if ((tm->tm_year < 2000) || (tm->tm_year > 2099))
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return -EINVAL;
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if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
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return -EINVAL;
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if ((tm->tm_mday < 1) || (tm->tm_mday > 31))
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return -EINVAL;
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if ((tm->tm_wday < 0) || (tm->tm_wday > 6))
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return -EINVAL;
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if ((tm->tm_hour < 0) || (tm->tm_hour > 23))
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return -EINVAL;
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if ((tm->tm_min < 0) || (tm->tm_min > 59))
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return -EINVAL;
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if ((tm->tm_sec < 0) || (tm->tm_sec > 59))
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return -EINVAL;
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return 0;
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}
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void s35392a_rtc_init(DEV_TYPE *dev)
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{
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int status;
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status = s35392a_rtc_read8(dev, S35390A_CMD_STATUS1);
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if (status < 0)
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goto error;
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DEBUGR("init: S35390A_CMD_STATUS1: 0x%x\n", status);
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lowvoltage = status & S35390A_LOW_VOLTAGE ? 1 : 0;
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if (status & S35390A_FLAG_POC)
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/*
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* Do not communicate for 0.5 seconds since the power-on
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* detection circuit is in operation.
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*/
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msleep(500);
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else if (!lowvoltage)
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/*
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* If both POC and BLD are unset everything is fine.
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*/
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return;
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if (lowvoltage)
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printf("RTC low voltage detected\n");
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if (!s35392a_rtc_reset(dev))
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return;
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error:
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printf("Error RTC init.\n");
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}
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/* Get the current time from the RTC */
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static int s35392a_rtc_get(DEV_TYPE *dev, struct rtc_time *tm)
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{
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u8 date[7];
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int ret, i;
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if (lowvoltage) {
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DEBUGR("RTC low voltage detected\n");
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return -EINVAL;
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}
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ret = s35392a_rtc_read(dev, S35390A_CMD_TIME1, date, sizeof(date));
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if (ret < 0) {
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DEBUGR("Error reading date from RTC\n");
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return -EIO;
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}
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/* This chip returns the bits of each byte in reverse order */
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for (i = 0; i < 7; ++i)
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date[i] = bitrev8(date[i]);
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tm->tm_sec = bcd2bin(date[S35390A_BYTE_SECS]);
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tm->tm_min = bcd2bin(date[S35390A_BYTE_MINS]);
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tm->tm_hour = bcd2bin(date[S35390A_BYTE_HOURS] & ~S35390A_FLAG_24H);
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tm->tm_wday = bcd2bin(date[S35390A_BYTE_WDAY]);
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tm->tm_mday = bcd2bin(date[S35390A_BYTE_DAY]);
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tm->tm_mon = bcd2bin(date[S35390A_BYTE_MONTH]);
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tm->tm_year = bcd2bin(date[S35390A_BYTE_YEAR]) + 2000;
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DEBUGR("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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/* Set the RTC */
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static int s35392a_rtc_set(DEV_TYPE *dev, const struct rtc_time *tm)
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{
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int i, ret;
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int status;
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u8 date[7];
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DEBUGR("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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ret = validate_time(tm);
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if (ret < 0)
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return -EINVAL;
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/* We support only 24h mode */
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ret = s35392a_rtc_read8(dev, S35390A_CMD_STATUS1);
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if (ret < 0)
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return -EIO;
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status = ret;
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ret = s35392a_rtc_write8(dev, S35390A_CMD_STATUS1,
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status | S35390A_FLAG_24H);
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if (ret < 0)
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return -EIO;
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date[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 2000);
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date[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon);
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date[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
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date[S35390A_BYTE_WDAY] = bin2bcd(tm->tm_wday);
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date[S35390A_BYTE_HOURS] = bin2bcd(tm->tm_hour);
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date[S35390A_BYTE_MINS] = bin2bcd(tm->tm_min);
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date[S35390A_BYTE_SECS] = bin2bcd(tm->tm_sec);
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/* This chip expects the bits of each byte to be in reverse order */
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for (i = 0; i < 7; ++i)
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date[i] = bitrev8(date[i]);
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ret = s35392a_rtc_write(dev, S35390A_CMD_TIME1, date, sizeof(date));
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if (ret < 0) {
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DEBUGR("Error writing date to RTC\n");
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return -EIO;
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}
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/* Now we have time. Reset the low voltage status */
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lowvoltage = 0;
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return 0;
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}
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/* Reset the RTC. */
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static int s35392a_rtc_reset(DEV_TYPE *dev)
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{
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int buf;
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int ret;
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unsigned int initcount = 0;
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buf = S35390A_FLAG_RESET;
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initialize:
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ret = s35392a_rtc_write8(dev, S35390A_CMD_STATUS1, buf);
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if (ret < 0)
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return -EIO;
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ret = s35392a_rtc_read8(dev, S35390A_CMD_STATUS1);
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if (ret < 0)
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return -EIO;
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buf = ret;
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if (!lowvoltage)
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lowvoltage = buf & S35390A_LOW_VOLTAGE ? 1 : 0;
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if (buf & S35390A_LOW_VOLTAGE) {
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/* Try up to five times to reset the chip */
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if (initcount < 5) {
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++initcount;
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goto initialize;
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} else {
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return -EIO;
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}
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}
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return 0;
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}
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#ifndef CONFIG_DM_RTC
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int rtc_get(struct rtc_time *tm)
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{
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return s35392a_rtc_get(&dev, tm);
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}
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int rtc_set(struct rtc_time *tm)
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{
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return s35392a_rtc_set(&dev, tm);
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}
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void rtc_reset(void)
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{
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s35392a_rtc_reset(&dev);
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}
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void rtc_init(void)
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{
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s35392a_rtc_init(&dev);
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}
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#else
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static int s35392a_probe(struct udevice *dev)
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{
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s35392a_rtc_init(dev);
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return 0;
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}
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static const struct rtc_ops s35392a_rtc_ops = {
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.get = s35392a_rtc_get,
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.set = s35392a_rtc_set,
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.read8 = s35392a_rtc_read8,
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.write8 = s35392a_rtc_write8,
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.reset = s35392a_rtc_reset,
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};
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static const struct udevice_id s35392a_rtc_ids[] = {
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{ .compatible = "sii,s35392a-rtc" },
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{ .compatible = "sii,s35392a" },
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{ .compatible = "s35392a" },
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{ }
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};
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U_BOOT_DRIVER(s35392a_rtc) = {
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.name = "s35392a_rtc",
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.id = UCLASS_RTC,
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.probe = s35392a_probe,
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.of_match = s35392a_rtc_ids,
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.ops = &s35392a_rtc_ops,
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};
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#endif
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