--- /dev/null
+/*
+ * Epson RX8010 RTC driver.
+ *
+ * Copyright (c) 2017, General Electric Company
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <command.h>
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <rtc.h>
+
+/*---------------------------------------------------------------------*/
+/* #undef DEBUG_RTC */
+
+#ifdef DEBUG_RTC
+#define DEBUGR(fmt, args...) printf(fmt, ##args)
+#else
+#define DEBUGR(fmt, args...)
+#endif
+/*---------------------------------------------------------------------*/
+
+#ifndef CONFIG_SYS_I2C_RTC_ADDR
+# define CONFIG_SYS_I2C_RTC_ADDR 0x32
+#endif
+
+/*
+ * RTC register addresses
+ */
+#define RX8010_SEC 0x10
+#define RX8010_MIN 0x11
+#define RX8010_HOUR 0x12
+#define RX8010_WDAY 0x13
+#define RX8010_MDAY 0x14
+#define RX8010_MONTH 0x15
+#define RX8010_YEAR 0x16
+#define RX8010_YEAR 0x16
+#define RX8010_RESV17 0x17
+#define RX8010_ALMIN 0x18
+#define RX8010_ALHOUR 0x19
+#define RX8010_ALWDAY 0x1A
+#define RX8010_TCOUNT0 0x1B
+#define RX8010_TCOUNT1 0x1C
+#define RX8010_EXT 0x1D
+#define RX8010_FLAG 0x1E
+#define RX8010_CTRL 0x1F
+/* 0x20 to 0x2F are user registers */
+#define RX8010_RESV30 0x30
+#define RX8010_RESV31 0x32
+#define RX8010_IRQ 0x32
+
+#define RX8010_EXT_WADA BIT(3)
+
+#define RX8010_FLAG_VLF BIT(1)
+#define RX8010_FLAG_AF BIT(3)
+#define RX8010_FLAG_TF BIT(4)
+#define RX8010_FLAG_UF BIT(5)
+
+#define RX8010_CTRL_AIE BIT(3)
+#define RX8010_CTRL_UIE BIT(5)
+#define RX8010_CTRL_STOP BIT(6)
+#define RX8010_CTRL_TEST BIT(7)
+
+#define RX8010_ALARM_AE BIT(7)
+
+#ifdef CONFIG_DM_RTC
+
+#define DEV_TYPE struct udevice
+
+#else
+
+/* Local udevice */
+struct ludevice {
+ u8 chip;
+};
+
+#define DEV_TYPE struct ludevice
+
+#endif
+
+static int rx8010sj_rtc_read8(DEV_TYPE *dev, unsigned int reg)
+{
+ u8 val;
+ int ret;
+
+#ifdef CONFIG_DM_RTC
+ ret = dm_i2c_read(dev, reg, &val, sizeof(val));
+#else
+ ret = i2c_read(dev->chip, reg, 1, &val, 1);
+#endif
+
+ return ret < 0 ? ret : val;
+}
+
+static int rx8010sj_rtc_write8(DEV_TYPE *dev, unsigned int reg, int val)
+{
+ int ret;
+ u8 lval = val;
+
+#ifdef CONFIG_DM_RTC
+ ret = dm_i2c_write(dev, reg, &lval, 1);
+#else
+ ret = i2c_write(dev->chip, reg, 1, &lval, 1);
+#endif
+
+ return ret < 0 ? ret : 0;
+}
+
+static int validate_time(const struct rtc_time *tm)
+{
+ if ((tm->tm_year < 2000) || (tm->tm_year > 2099))
+ return -EINVAL;
+
+ if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
+ return -EINVAL;
+
+ if ((tm->tm_mday < 1) || (tm->tm_mday > 31))
+ return -EINVAL;
+
+ if ((tm->tm_wday < 0) || (tm->tm_wday > 6))
+ return -EINVAL;
+
+ if ((tm->tm_hour < 0) || (tm->tm_hour > 23))
+ return -EINVAL;
+
+ if ((tm->tm_min < 0) || (tm->tm_min > 59))
+ return -EINVAL;
+
+ if ((tm->tm_sec < 0) || (tm->tm_sec > 59))
+ return -EINVAL;
+
+ return 0;
+}
+
+void rx8010sj_rtc_init(DEV_TYPE *dev)
+{
+ u8 ctrl[2];
+ int need_clear = 0, ret = 0;
+
+ /* Initialize reserved registers as specified in datasheet */
+ ret = rx8010sj_rtc_write8(dev, RX8010_RESV17, 0xD8);
+ if (ret < 0)
+ goto error;
+
+ ret = rx8010sj_rtc_write8(dev, RX8010_RESV30, 0x00);
+ if (ret < 0)
+ goto error;
+
+ ret = rx8010sj_rtc_write8(dev, RX8010_RESV31, 0x08);
+ if (ret < 0)
+ goto error;
+
+ ret = rx8010sj_rtc_write8(dev, RX8010_IRQ, 0x00);
+ if (ret < 0)
+ goto error;
+
+ for (int i = 0; i < 2; i++) {
+ ret = rx8010sj_rtc_read8(dev, RX8010_FLAG + i);
+ if (ret < 0)
+ goto error;
+
+ ctrl[i] = ret;
+ }
+
+ if (ctrl[0] & RX8010_FLAG_VLF)
+ printf("RTC low voltage detected\n");
+
+ if (ctrl[0] & RX8010_FLAG_AF) {
+ printf("Alarm was detected\n");
+ need_clear = 1;
+ }
+
+ if (ctrl[0] & RX8010_FLAG_TF)
+ need_clear = 1;
+
+ if (ctrl[0] & RX8010_FLAG_UF)
+ need_clear = 1;
+
+ if (need_clear) {
+ ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
+ ret = rx8010sj_rtc_write8(dev, RX8010_FLAG, ctrl[0]);
+ if (ret < 0)
+ goto error;
+ }
+
+ return;
+
+error:
+ printf("Error rtc init.\n");
+}
+
+/* Get the current time from the RTC */
+static int rx8010sj_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp)
+{
+ u8 date[7];
+ int flagreg;
+ int ret;
+
+ flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG);
+ if (flagreg < 0) {
+ DEBUGR("Error reading from RTC. err: %d\n", flagreg);
+ return -EIO;
+ }
+
+ if (flagreg & RX8010_FLAG_VLF) {
+ DEBUGR("RTC low voltage detected\n");
+ return -EINVAL;
+ }
+
+ for (int i = 0; i < 7; i++) {
+ ret = rx8010sj_rtc_read8(dev, RX8010_SEC + i);
+ if (ret < 0) {
+ DEBUGR("Error reading from RTC. err: %d\n", ret);
+ return -EIO;
+ }
+ date[i] = ret;
+ }
+
+ tmp->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
+ tmp->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
+ tmp->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
+ tmp->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
+ tmp->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f);
+ tmp->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 2000;
+ tmp->tm_wday = 0;
+ tmp->tm_yday = 0;
+ tmp->tm_isdst = 0;
+
+ DEBUGR("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+ tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+ return 0;
+}
+
+/* Set the RTC */
+static int rx8010sj_rtc_set(DEV_TYPE *dev, const struct rtc_time *tm)
+{
+ u8 date[7];
+ int ctrl, flagreg;
+ int ret;
+
+ ret = validate_time(tm);
+ if (ret < 0)
+ return -EINVAL;
+
+ /* set STOP bit before changing clock/calendar */
+ ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL);
+ if (ctrl < 0)
+ return ctrl;
+ ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl | RX8010_CTRL_STOP);
+ if (ret < 0)
+ return ret;
+
+ date[RX8010_SEC - RX8010_SEC] = bin2bcd(tm->tm_sec);
+ date[RX8010_MIN - RX8010_SEC] = bin2bcd(tm->tm_min);
+ date[RX8010_HOUR - RX8010_SEC] = bin2bcd(tm->tm_hour);
+ date[RX8010_MDAY - RX8010_SEC] = bin2bcd(tm->tm_mday);
+ date[RX8010_MONTH - RX8010_SEC] = bin2bcd(tm->tm_mon);
+ date[RX8010_YEAR - RX8010_SEC] = bin2bcd(tm->tm_year - 2000);
+ date[RX8010_WDAY - RX8010_SEC] = bin2bcd(tm->tm_wday);
+
+ for (int i = 0; i < 7; i++) {
+ ret = rx8010sj_rtc_write8(dev, RX8010_SEC + i, date[i]);
+ if (ret < 0) {
+ DEBUGR("Error writing to RTC. err: %d\n", ret);
+ return -EIO;
+ }
+ }
+
+ /* clear STOP bit after changing clock/calendar */
+ ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL);
+ if (ctrl < 0)
+ return ctrl;
+
+ ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl & ~RX8010_CTRL_STOP);
+ if (ret < 0)
+ return ret;
+
+ flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG);
+ if (flagreg < 0)
+ return flagreg;
+
+ if (flagreg & RX8010_FLAG_VLF)
+ ret = rx8010sj_rtc_write8(dev, RX8010_FLAG,
+ flagreg & ~RX8010_FLAG_VLF);
+
+ return 0;
+}
+
+/* Reset the RTC. */
+static int rx8010sj_rtc_reset(DEV_TYPE *dev)
+{
+ /* Not needed */
+ return 0;
+}
+
+#ifndef CONFIG_DM_RTC
+
+int rtc_get(struct rtc_time *tm)
+{
+ struct ludevice dev = {
+ .chip = CONFIG_SYS_I2C_RTC_ADDR,
+ };
+
+ return rx8010sj_rtc_get(&dev, tm);
+}
+
+int rtc_set(struct rtc_time *tm)
+{
+ struct ludevice dev = {
+ .chip = CONFIG_SYS_I2C_RTC_ADDR,
+ };
+
+ return rx8010sj_rtc_set(&dev, tm);
+}
+
+void rtc_reset(void)
+{
+ struct ludevice dev = {
+ .chip = CONFIG_SYS_I2C_RTC_ADDR,
+ };
+
+ rx8010sj_rtc_reset(&dev);
+}
+
+void rtc_init(void)
+{
+ struct ludevice dev = {
+ .chip = CONFIG_SYS_I2C_RTC_ADDR,
+ };
+
+ rx8010sj_rtc_init(&dev);
+}
+
+#else
+
+static int rx8010sj_probe(struct udevice *dev)
+{
+ rx8010sj_rtc_init(&dev);
+
+ return 0;
+}
+
+static const struct rtc_ops rx8010sj_rtc_ops = {
+ .get = rx8010sj_rtc_get,
+ .set = rx8010sj_rtc_set,
+ .read8 = rx8010sj_rtc_read8,
+ .write8 = rx8010sj_rtc_write8,
+ .reset = rx8010sj_rtc_reset,
+};
+
+static const struct udevice_id rx8010sj_rtc_ids[] = {
+ { .compatible = "epson,rx8010sj-rtc" },
+ { }
+};
+
+U_BOOT_DRIVER(rx8010sj_rtc) = {
+ .name = "rx8010sj_rtc",
+ .id = UCLASS_RTC,
+ .probe = rx8010sj_probe,
+ .of_match = rx8010sj_rtc_ids,
+ .ops = &rx8010sj_rtc_ops,
+};
+
+#endif
projects / u-boot / commitdiff