Add a new driver for RX8010SJ rtc chip. The driver implements both formats of U-Boot driver model. Signed-off-by: Nandor Han <nandor.han@ge.com> Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>master
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/*
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* Epson RX8010 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 <rtc.h> |
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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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#ifndef CONFIG_SYS_I2C_RTC_ADDR |
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# define CONFIG_SYS_I2C_RTC_ADDR 0x32 |
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#endif |
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/*
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* RTC register addresses |
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*/ |
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#define RX8010_SEC 0x10 |
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#define RX8010_MIN 0x11 |
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#define RX8010_HOUR 0x12 |
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#define RX8010_WDAY 0x13 |
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#define RX8010_MDAY 0x14 |
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#define RX8010_MONTH 0x15 |
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#define RX8010_YEAR 0x16 |
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#define RX8010_YEAR 0x16 |
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#define RX8010_RESV17 0x17 |
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#define RX8010_ALMIN 0x18 |
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#define RX8010_ALHOUR 0x19 |
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#define RX8010_ALWDAY 0x1A |
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#define RX8010_TCOUNT0 0x1B |
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#define RX8010_TCOUNT1 0x1C |
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#define RX8010_EXT 0x1D |
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#define RX8010_FLAG 0x1E |
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#define RX8010_CTRL 0x1F |
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/* 0x20 to 0x2F are user registers */ |
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#define RX8010_RESV30 0x30 |
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#define RX8010_RESV31 0x32 |
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#define RX8010_IRQ 0x32 |
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#define RX8010_EXT_WADA BIT(3) |
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#define RX8010_FLAG_VLF BIT(1) |
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#define RX8010_FLAG_AF BIT(3) |
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#define RX8010_FLAG_TF BIT(4) |
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#define RX8010_FLAG_UF BIT(5) |
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#define RX8010_CTRL_AIE BIT(3) |
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#define RX8010_CTRL_UIE BIT(5) |
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#define RX8010_CTRL_STOP BIT(6) |
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#define RX8010_CTRL_TEST BIT(7) |
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#define RX8010_ALARM_AE BIT(7) |
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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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#endif |
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static int rx8010sj_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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#ifdef CONFIG_DM_RTC |
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ret = dm_i2c_read(dev, reg, &val, sizeof(val)); |
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#else |
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ret = i2c_read(dev->chip, reg, 1, &val, 1); |
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#endif |
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return ret < 0 ? ret : val; |
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} |
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static int rx8010sj_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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#ifdef CONFIG_DM_RTC |
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ret = dm_i2c_write(dev, reg, &lval, 1); |
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#else |
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ret = i2c_write(dev->chip, reg, 1, &lval, 1); |
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#endif |
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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 rx8010sj_rtc_init(DEV_TYPE *dev) |
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{ |
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u8 ctrl[2]; |
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int need_clear = 0, ret = 0; |
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/* Initialize reserved registers as specified in datasheet */ |
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ret = rx8010sj_rtc_write8(dev, RX8010_RESV17, 0xD8); |
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if (ret < 0) |
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goto error; |
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ret = rx8010sj_rtc_write8(dev, RX8010_RESV30, 0x00); |
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if (ret < 0) |
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goto error; |
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ret = rx8010sj_rtc_write8(dev, RX8010_RESV31, 0x08); |
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if (ret < 0) |
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goto error; |
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ret = rx8010sj_rtc_write8(dev, RX8010_IRQ, 0x00); |
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if (ret < 0) |
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goto error; |
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for (int i = 0; i < 2; i++) { |
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ret = rx8010sj_rtc_read8(dev, RX8010_FLAG + i); |
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if (ret < 0) |
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goto error; |
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ctrl[i] = ret; |
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} |
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if (ctrl[0] & RX8010_FLAG_VLF) |
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printf("RTC low voltage detected\n"); |
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if (ctrl[0] & RX8010_FLAG_AF) { |
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printf("Alarm was detected\n"); |
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need_clear = 1; |
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} |
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if (ctrl[0] & RX8010_FLAG_TF) |
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need_clear = 1; |
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if (ctrl[0] & RX8010_FLAG_UF) |
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need_clear = 1; |
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if (need_clear) { |
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ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); |
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ret = rx8010sj_rtc_write8(dev, RX8010_FLAG, ctrl[0]); |
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if (ret < 0) |
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goto error; |
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} |
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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 rx8010sj_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp) |
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{ |
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u8 date[7]; |
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int flagreg; |
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int ret; |
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flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG); |
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if (flagreg < 0) { |
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DEBUGR("Error reading from RTC. err: %d\n", flagreg); |
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return -EIO; |
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} |
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if (flagreg & RX8010_FLAG_VLF) { |
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DEBUGR("RTC low voltage detected\n"); |
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return -EINVAL; |
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} |
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for (int i = 0; i < 7; i++) { |
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ret = rx8010sj_rtc_read8(dev, RX8010_SEC + i); |
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if (ret < 0) { |
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DEBUGR("Error reading from RTC. err: %d\n", ret); |
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return -EIO; |
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} |
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date[i] = ret; |
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} |
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tmp->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f); |
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tmp->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f); |
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tmp->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f); |
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tmp->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f); |
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tmp->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f); |
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tmp->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 2000; |
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tmp->tm_wday = 0; |
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tmp->tm_yday = 0; |
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tmp->tm_isdst = 0; |
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DEBUGR("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
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tmp->tm_hour, tmp->tm_min, tmp->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 rx8010sj_rtc_set(DEV_TYPE *dev, const struct rtc_time *tm) |
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{ |
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u8 date[7]; |
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int ctrl, flagreg; |
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int ret; |
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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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/* set STOP bit before changing clock/calendar */ |
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ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL); |
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if (ctrl < 0) |
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return ctrl; |
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ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl | RX8010_CTRL_STOP); |
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if (ret < 0) |
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return ret; |
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date[RX8010_SEC - RX8010_SEC] = bin2bcd(tm->tm_sec); |
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date[RX8010_MIN - RX8010_SEC] = bin2bcd(tm->tm_min); |
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date[RX8010_HOUR - RX8010_SEC] = bin2bcd(tm->tm_hour); |
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date[RX8010_MDAY - RX8010_SEC] = bin2bcd(tm->tm_mday); |
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date[RX8010_MONTH - RX8010_SEC] = bin2bcd(tm->tm_mon); |
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date[RX8010_YEAR - RX8010_SEC] = bin2bcd(tm->tm_year - 2000); |
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date[RX8010_WDAY - RX8010_SEC] = bin2bcd(tm->tm_wday); |
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for (int i = 0; i < 7; i++) { |
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ret = rx8010sj_rtc_write8(dev, RX8010_SEC + i, date[i]); |
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if (ret < 0) { |
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DEBUGR("Error writing to RTC. err: %d\n", ret); |
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return -EIO; |
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} |
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} |
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/* clear STOP bit after changing clock/calendar */ |
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ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL); |
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if (ctrl < 0) |
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return ctrl; |
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ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl & ~RX8010_CTRL_STOP); |
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if (ret < 0) |
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return ret; |
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flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG); |
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if (flagreg < 0) |
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return flagreg; |
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if (flagreg & RX8010_FLAG_VLF) |
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ret = rx8010sj_rtc_write8(dev, RX8010_FLAG, |
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flagreg & ~RX8010_FLAG_VLF); |
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return 0; |
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} |
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/* Reset the RTC. */ |
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static int rx8010sj_rtc_reset(DEV_TYPE *dev) |
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{ |
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/* Not needed */ |
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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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struct ludevice dev = { |
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.chip = CONFIG_SYS_I2C_RTC_ADDR, |
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}; |
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return rx8010sj_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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struct ludevice dev = { |
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.chip = CONFIG_SYS_I2C_RTC_ADDR, |
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}; |
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return rx8010sj_rtc_set(&dev, tm); |
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} |
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void rtc_reset(void) |
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{ |
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struct ludevice dev = { |
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.chip = CONFIG_SYS_I2C_RTC_ADDR, |
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}; |
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rx8010sj_rtc_reset(&dev); |
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} |
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void rtc_init(void) |
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{ |
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struct ludevice dev = { |
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.chip = CONFIG_SYS_I2C_RTC_ADDR, |
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}; |
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rx8010sj_rtc_init(&dev); |
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} |
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#else |
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static int rx8010sj_probe(struct udevice *dev) |
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{ |
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rx8010sj_rtc_init(&dev); |
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return 0; |
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} |
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static const struct rtc_ops rx8010sj_rtc_ops = { |
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.get = rx8010sj_rtc_get, |
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.set = rx8010sj_rtc_set, |
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.read8 = rx8010sj_rtc_read8, |
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.write8 = rx8010sj_rtc_write8, |
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.reset = rx8010sj_rtc_reset, |
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}; |
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static const struct udevice_id rx8010sj_rtc_ids[] = { |
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{ .compatible = "epson,rx8010sj-rtc" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(rx8010sj_rtc) = { |
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.name = "rx8010sj_rtc", |
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.id = UCLASS_RTC, |
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.probe = rx8010sj_probe, |
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.of_match = rx8010sj_rtc_ids, |
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.ops = &rx8010sj_rtc_ops, |
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}; |
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#endif |
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