381 lines
8.1 KiB
C
381 lines
8.1 KiB
C
/*
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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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#include <linux/bitops.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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{ .compatible = "epson,rx8010" },
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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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