--- /dev/null
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd
+ * http://www.samsung.com
+ *
+ * Copyright (C) 2013 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/bcd.h>
+#include <linux/bitops.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/samsung/core.h>
+#include <linux/mfd/samsung/irq.h>
+#include <linux/mfd/samsung/rtc.h>
+
+struct s5m_rtc_info {
+ struct device *dev;
+ struct sec_pmic_dev *s5m87xx;
+ struct regmap *rtc;
+ struct rtc_device *rtc_dev;
+ int irq;
+ int device_type;
+ int rtc_24hr_mode;
+ bool wtsr_smpl;
+};
+
+static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
+ int rtc_24hr_mode)
+{
+ tm->tm_sec = data[RTC_SEC] & 0x7f;
+ tm->tm_min = data[RTC_MIN] & 0x7f;
+ if (rtc_24hr_mode) {
+ tm->tm_hour = data[RTC_HOUR] & 0x1f;
+ } else {
+ tm->tm_hour = data[RTC_HOUR] & 0x0f;
+ if (data[RTC_HOUR] & HOUR_PM_MASK)
+ tm->tm_hour += 12;
+ }
+
+ tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
+ tm->tm_mday = data[RTC_DATE] & 0x1f;
+ tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
+ tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
+ tm->tm_yday = 0;
+ tm->tm_isdst = 0;
+}
+
+static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
+{
+ data[RTC_SEC] = tm->tm_sec;
+ data[RTC_MIN] = tm->tm_min;
+
+ if (tm->tm_hour >= 12)
+ data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
+ else
+ data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
+
+ data[RTC_WEEKDAY] = 1 << tm->tm_wday;
+ data[RTC_DATE] = tm->tm_mday;
+ data[RTC_MONTH] = tm->tm_mon + 1;
+ data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
+
+ if (tm->tm_year < 100) {
+ pr_err("s5m8767 RTC cannot handle the year %d.\n",
+ 1900 + tm->tm_year);
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+}
+
+static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
+{
+ int ret;
+ unsigned int data;
+
+ ret = regmap_read(info->rtc, SEC_RTC_UDR_CON, &data);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to read update reg(%d)\n", ret);
+ return ret;
+ }
+
+ data |= RTC_TIME_EN_MASK;
+ data |= RTC_UDR_MASK;
+
+ ret = regmap_write(info->rtc, SEC_RTC_UDR_CON, data);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to write update reg(%d)\n", ret);
+ return ret;
+ }
+
+ do {
+ ret = regmap_read(info->rtc, SEC_RTC_UDR_CON, &data);
+ } while ((data & RTC_UDR_MASK) && !ret);
+
+ return ret;
+}
+
+static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
+{
+ int ret;
+ unsigned int data;
+
+ ret = regmap_read(info->rtc, SEC_RTC_UDR_CON, &data);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to read update reg(%d)\n",
+ __func__, ret);
+ return ret;
+ }
+
+ data &= ~RTC_TIME_EN_MASK;
+ data |= RTC_UDR_MASK;
+
+ ret = regmap_write(info->rtc, SEC_RTC_UDR_CON, data);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to write update reg(%d)\n",
+ __func__, ret);
+ return ret;
+ }
+
+ do {
+ ret = regmap_read(info->rtc, SEC_RTC_UDR_CON, &data);
+ } while ((data & RTC_UDR_MASK) && !ret);
+
+ return ret;
+}
+
+static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
+{
+ tm->tm_sec = bcd2bin(data[RTC_SEC]);
+ tm->tm_min = bcd2bin(data[RTC_MIN]);
+
+ if (data[RTC_HOUR] & HOUR_12) {
+ tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
+ if (data[RTC_HOUR] & HOUR_PM)
+ tm->tm_hour += 12;
+ } else {
+ tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
+ }
+
+ tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
+ tm->tm_mday = bcd2bin(data[RTC_DATE]);
+ tm->tm_mon = bcd2bin(data[RTC_MONTH]);
+ tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
+ tm->tm_year -= 1900;
+}
+
+static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
+{
+ data[RTC_SEC] = bin2bcd(tm->tm_sec);
+ data[RTC_MIN] = bin2bcd(tm->tm_min);
+ data[RTC_HOUR] = bin2bcd(tm->tm_hour);
+ data[RTC_WEEKDAY] = tm->tm_wday;
+ data[RTC_DATE] = bin2bcd(tm->tm_mday);
+ data[RTC_MONTH] = bin2bcd(tm->tm_mon);
+ data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
+ data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
+}
+
+static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct s5m_rtc_info *info = dev_get_drvdata(dev);
+ u8 data[8];
+ int ret;
+
+ ret = regmap_bulk_read(info->rtc, SEC_RTC_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ switch (info->device_type) {
+ case S5M8763X:
+ s5m8763_data_to_tm(data, tm);
+ break;
+
+ case S5M8767X:
+ s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
+
+ return rtc_valid_tm(tm);
+}
+
+static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct s5m_rtc_info *info = dev_get_drvdata(dev);
+ u8 data[8];
+ int ret = 0;
+
+ switch (info->device_type) {
+ case S5M8763X:
+ s5m8763_tm_to_data(tm, data);
+ break;
+ case S5M8767X:
+ ret = s5m8767_tm_to_data(tm, data);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
+
+ ret = regmap_raw_write(info->rtc, SEC_RTC_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ ret = s5m8767_rtc_set_time_reg(info);
+
+ return ret;
+}
+
+static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct s5m_rtc_info *info = dev_get_drvdata(dev);
+ u8 data[8];
+ unsigned int val;
+ int ret, i;
+
+ ret = regmap_bulk_read(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ switch (info->device_type) {
+ case S5M8763X:
+ s5m8763_data_to_tm(data, &alrm->time);
+ ret = regmap_read(info->rtc, SEC_ALARM0_CONF, &val);
+ if (ret < 0)
+ return ret;
+
+ alrm->enabled = !!val;
+
+ ret = regmap_read(info->rtc, SEC_RTC_STATUS, &val);
+ if (ret < 0)
+ return ret;
+
+ break;
+
+ case S5M8767X:
+ s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
+ dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
+ alrm->time.tm_mday, alrm->time.tm_hour,
+ alrm->time.tm_min, alrm->time.tm_sec,
+ alrm->time.tm_wday);
+
+ alrm->enabled = 0;
+ for (i = 0; i < 7; i++) {
+ if (data[i] & ALARM_ENABLE_MASK) {
+ alrm->enabled = 1;
+ break;
+ }
+ }
+
+ alrm->pending = 0;
+ ret = regmap_read(info->rtc, SEC_RTC_STATUS, &val);
+ if (ret < 0)
+ return ret;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (val & ALARM0_STATUS)
+ alrm->pending = 1;
+ else
+ alrm->pending = 0;
+
+ return 0;
+}
+
+static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
+{
+ u8 data[8];
+ int ret, i;
+ struct rtc_time tm;
+
+ ret = regmap_bulk_read(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
+ dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
+
+ switch (info->device_type) {
+ case S5M8763X:
+ ret = regmap_write(info->rtc, SEC_ALARM0_CONF, 0);
+ break;
+
+ case S5M8767X:
+ for (i = 0; i < 7; i++)
+ data[i] &= ~ALARM_ENABLE_MASK;
+
+ ret = regmap_raw_write(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ ret = s5m8767_rtc_set_alarm_reg(info);
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
+{
+ int ret;
+ u8 data[8];
+ u8 alarm0_conf;
+ struct rtc_time tm;
+
+ ret = regmap_bulk_read(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
+ dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
+
+ switch (info->device_type) {
+ case S5M8763X:
+ alarm0_conf = 0x77;
+ ret = regmap_write(info->rtc, SEC_ALARM0_CONF, alarm0_conf);
+ break;
+
+ case S5M8767X:
+ data[RTC_SEC] |= ALARM_ENABLE_MASK;
+ data[RTC_MIN] |= ALARM_ENABLE_MASK;
+ data[RTC_HOUR] |= ALARM_ENABLE_MASK;
+ data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
+ if (data[RTC_DATE] & 0x1f)
+ data[RTC_DATE] |= ALARM_ENABLE_MASK;
+ if (data[RTC_MONTH] & 0xf)
+ data[RTC_MONTH] |= ALARM_ENABLE_MASK;
+ if (data[RTC_YEAR1] & 0x7f)
+ data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
+
+ ret = regmap_raw_write(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+ ret = s5m8767_rtc_set_alarm_reg(info);
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct s5m_rtc_info *info = dev_get_drvdata(dev);
+ u8 data[8];
+ int ret;
+
+ switch (info->device_type) {
+ case S5M8763X:
+ s5m8763_tm_to_data(&alrm->time, data);
+ break;
+
+ case S5M8767X:
+ s5m8767_tm_to_data(&alrm->time, data);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+ 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
+ alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
+ alrm->time.tm_sec, alrm->time.tm_wday);
+
+ ret = s5m_rtc_stop_alarm(info);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_raw_write(info->rtc, SEC_ALARM0_SEC, data, 8);
+ if (ret < 0)
+ return ret;
+
+ ret = s5m8767_rtc_set_alarm_reg(info);
+ if (ret < 0)
+ return ret;
+
+ if (alrm->enabled)
+ ret = s5m_rtc_start_alarm(info);
+
+ return ret;
+}
+
+static int s5m_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct s5m_rtc_info *info = dev_get_drvdata(dev);
+
+ if (enabled)
+ return s5m_rtc_start_alarm(info);
+ else
+ return s5m_rtc_stop_alarm(info);
+}
+
+static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
+{
+ struct s5m_rtc_info *info = data;
+
+ rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
+
+ return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops s5m_rtc_ops = {
+ .read_time = s5m_rtc_read_time,
+ .set_time = s5m_rtc_set_time,
+ .read_alarm = s5m_rtc_read_alarm,
+ .set_alarm = s5m_rtc_set_alarm,
+ .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
+};
+
+static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
+{
+ int ret;
+ ret = regmap_update_bits(info->rtc, SEC_WTSR_SMPL_CNTL,
+ WTSR_ENABLE_MASK,
+ enable ? WTSR_ENABLE_MASK : 0);
+ if (ret < 0)
+ dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
+ __func__, ret);
+}
+
+static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
+{
+ int ret;
+ ret = regmap_update_bits(info->rtc, SEC_WTSR_SMPL_CNTL,
+ SMPL_ENABLE_MASK,
+ enable ? SMPL_ENABLE_MASK : 0);
+ if (ret < 0)
+ dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
+ __func__, ret);
+}
+
+static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
+{
+ u8 data[2];
+ unsigned int tp_read;
+ int ret;
+ struct rtc_time tm;
+
+ ret = regmap_read(info->rtc, SEC_RTC_UDR_CON, &tp_read);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to read control reg(%d)\n",
+ __func__, ret);
+ return ret;
+ }
+
+ /* Set RTC control register : Binary mode, 24hour mode */
+ data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
+ data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
+
+ info->rtc_24hr_mode = 1;
+ ret = regmap_raw_write(info->rtc, SEC_ALARM0_CONF, data, 2);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
+ __func__, ret);
+ return ret;
+ }
+
+ /* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */
+ if ((tp_read & RTC_TCON_MASK) == 0) {
+ dev_dbg(info->dev, "rtc init\n");
+ tm.tm_sec = 0;
+ tm.tm_min = 0;
+ tm.tm_hour = 0;
+ tm.tm_wday = 0;
+ tm.tm_mday = 1;
+ tm.tm_mon = 0;
+ tm.tm_year = 112;
+ tm.tm_yday = 0;
+ tm.tm_isdst = 0;
+ ret = s5m_rtc_set_time(info->dev, &tm);
+ }
+
+ ret = regmap_update_bits(info->rtc, SEC_RTC_UDR_CON,
+ RTC_TCON_MASK, tp_read | RTC_TCON_MASK);
+ if (ret < 0)
+ dev_err(info->dev, "%s: fail to update TCON reg(%d)\n",
+ __func__, ret);
+
+ return ret;
+}
+
+static int s5m_rtc_probe(struct platform_device *pdev)
+{
+ struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
+ struct sec_platform_data *pdata = s5m87xx->pdata;
+ struct s5m_rtc_info *info;
+ int ret;
+
+ if (!pdata) {
+ dev_err(pdev->dev.parent, "Platform data not supplied\n");
+ return -ENODEV;
+ }
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->dev = &pdev->dev;
+ info->s5m87xx = s5m87xx;
+ info->rtc = s5m87xx->rtc;
+ info->device_type = s5m87xx->device_type;
+ info->wtsr_smpl = s5m87xx->wtsr_smpl;
+
+ switch (pdata->device_type) {
+ case S5M8763X:
+ info->irq = s5m87xx->irq_base + S5M8763_IRQ_ALARM0;
+ break;
+
+ case S5M8767X:
+ info->irq = s5m87xx->irq_base + S5M8767_IRQ_RTCA1;
+ break;
+
+ default:
+ ret = -EINVAL;
+ dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, info);
+
+ ret = s5m8767_rtc_init_reg(info);
+
+ if (info->wtsr_smpl) {
+ s5m_rtc_enable_wtsr(info, true);
+ s5m_rtc_enable_smpl(info, true);
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
+ &s5m_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(info->rtc_dev))
+ return PTR_ERR(info->rtc_dev);
+
+ ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
+ s5m_rtc_alarm_irq, 0, "rtc-alarm0",
+ info);
+ if (ret < 0)
+ dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
+ info->irq, ret);
+
+ return ret;
+}
+
+static void s5m_rtc_shutdown(struct platform_device *pdev)
+{
+ struct s5m_rtc_info *info = platform_get_drvdata(pdev);
+ int i;
+ unsigned int val = 0;
+ if (info->wtsr_smpl) {
+ for (i = 0; i < 3; i++) {
+ s5m_rtc_enable_wtsr(info, false);
+ regmap_read(info->rtc, SEC_WTSR_SMPL_CNTL, &val);
+ pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
+ if (val & WTSR_ENABLE_MASK)
+ pr_emerg("%s: fail to disable WTSR\n",
+ __func__);
+ else {
+ pr_info("%s: success to disable WTSR\n",
+ __func__);
+ break;
+ }
+ }
+ }
+ /* Disable SMPL when power off */
+ s5m_rtc_enable_smpl(info, false);
+}
+
+static const struct platform_device_id s5m_rtc_id[] = {
+ { "s5m-rtc", 0 },
+};
+
+static struct platform_driver s5m_rtc_driver = {
+ .driver = {
+ .name = "s5m-rtc",
+ .owner = THIS_MODULE,
+ },
+ .probe = s5m_rtc_probe,
+ .shutdown = s5m_rtc_shutdown,
+ .id_table = s5m_rtc_id,
+};
+
+module_platform_driver(s5m_rtc_driver);
+
+/* Module information */
+MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
+MODULE_DESCRIPTION("Samsung S5M RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s5m-rtc");
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