Add an RTC driver for the RTC device on Ricoh MFD rc5t619,
which is implemented as a variant of rn5t618
Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
---
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-rc5t619.c | 476 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 487 insertions(+)
create mode 100644 drivers/rtc/rtc-rc5t619.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e72f65b61176..a4dc04c49fec 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -588,6 +588,16 @@ config RTC_DRV_RC5T583
This driver can also be built as a module. If so, the module
will be called rtc-rc5t583.
+config RTC_DRV_RC5T619
+ tristate "RICOH RC5T619 RTC driver"
+ depends on MFD_RN5T618
+ help
+ If you say yes here you get support for the RTC on the
+ RICOH RC5T619 chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-rc5t619.
+
config RTC_DRV_S35390A
tristate "Seiko Instruments S-35390A"
select BITREVERSE
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 6b09c21dc1b6..1d0673fd0954 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -136,6 +136,7 @@ obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
obj-$(CONFIG_RTC_DRV_R7301) += rtc-r7301.o
obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
obj-$(CONFIG_RTC_DRV_RC5T583) += rtc-rc5t583.o
+obj-$(CONFIG_RTC_DRV_RC5T619) += rtc-rc5t619.o
obj-$(CONFIG_RTC_DRV_RK808) += rtc-rk808.o
obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o
obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
diff --git a/drivers/rtc/rtc-rc5t619.c b/drivers/rtc/rtc-rc5t619.c
new file mode 100644
index 000000000000..311788ff0723
--- /dev/null
+++ b/drivers/rtc/rtc-rc5t619.c
@@ -0,0 +1,476 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * drivers/rtc/rtc-ricoh619.c
+ *
+ * Real time clock driver for RICOH R5T619 power management chip.
+ *
+ * Copyright (C) 2019 Andreas Kemnade
+ *
+ * Based on code
+ * Copyright (C) 2012-2014 RICOH COMPANY,LTD
+ *
+ * Based on code
+ * Copyright (C) 2011 NVIDIA Corporation
+ */
+
+/* #define debug 1 */
+/* #define verbose_debug 1 */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mfd/rn5t618.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+#include <linux/irqdomain.h>
+
+struct rc5t619_rtc {
+ int irq;
+ struct rtc_device *rtc;
+ struct rn5t618 *rn5t618;
+};
+
+#define CTRL1_ALARM_ENABLED 0x40
+#define CTRL1_24HR 0x20
+#define CTRL1_PERIODIC_MASK 0xf
+
+#define CTRL2_PON 0x10
+#define CTRL2_ALARM_STATUS 0x80
+#define CTRL2_CTFG 0x4
+#define CTRL2_CTC 0x1
+
+static int rc5t619_rtc_periodic_disable(struct device *dev)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+
+ /* disable function */
+ err = regmap_update_bits(rtc->rn5t618->regmap,
+ RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
+ if (err < 0)
+ return err;
+
+ /* clear alarm flag and CTFG */
+ err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
+ CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC, 0);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int rc5t619_rtc_clk_adjust(struct device *dev, uint8_t clk)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+ return regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, clk);
+}
+
+static int rc5t619_rtc_pon_get_clr(struct device *dev, uint8_t *pon_f)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+ unsigned int reg_data;
+
+ err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, ®_data);
+ if (err < 0)
+ return err;
+
+ if (reg_data & CTRL2_PON) {
+ *pon_f = 1;
+ /* clear VDET PON */
+ reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a); /* 0101-1011 */
+ reg_data |= 0x20; /* 0010-0000 */
+ err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
+ reg_data);
+ } else {
+ *pon_f = 0;
+ }
+
+ return err;
+}
+
+/* 0-12hour, 1-24hour */
+static int rc5t619_rtc_24hour_mode_set(struct device *dev, int mode)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+ return regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1,
+ CTRL1_24HR, mode ? CTRL1_24HR : 0);
+}
+
+
+static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ u8 buff[7];
+ int err;
+ int cent_flag;
+
+ err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
+ buff, sizeof(buff));
+ if (err < 0) {
+ dev_err(dev, "failed to read time: %d\n", err);
+ return err;
+ }
+
+ if (buff[5] & 0x80)
+ cent_flag = 1;
+ else
+ cent_flag = 0;
+
+ buff[5] = buff[5] & 0x1f; /* bit5 19_20 */
+
+ tm->tm_sec = bcd2bin(buff[0]);
+ tm->tm_min = bcd2bin(buff[1]);
+ tm->tm_hour = bcd2bin(buff[2]); /* bit5 PA_H20 */
+ tm->tm_wday = bcd2bin(buff[3]);
+ tm->tm_mday = bcd2bin(buff[4]);
+ tm->tm_mon = bcd2bin(buff[5]) - 1; /* back to system 0-11 */
+ tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
+
+ return 0;
+}
+
+static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ u8 buff[7];
+ int err;
+ int cent_flag;
+
+ if (tm->tm_year >= 100)
+ cent_flag = 1;
+ else
+ cent_flag = 0;
+
+ tm->tm_mon = tm->tm_mon + 1;
+ buff[0] = bin2bcd(tm->tm_sec);
+ buff[1] = bin2bcd(tm->tm_min);
+ buff[2] = bin2bcd(tm->tm_hour);
+ buff[3] = bin2bcd(tm->tm_wday);
+ buff[4] = bin2bcd(tm->tm_mday);
+ buff[5] = bin2bcd(tm->tm_mon); /* system set 0-11 */
+ buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
+
+ if (cent_flag)
+ buff[5] |= 0x80;
+
+ err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
+ buff, sizeof(buff));
+ if (err < 0) {
+ dev_err(dev, "failed to program new time: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int rc5t619_rtc_alarm_is_enabled(struct device *dev, uint8_t *enabled)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+ unsigned int reg_data;
+
+ err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, ®_data);
+ if (err) {
+ dev_err(dev, "read RTC_CTRL1 error %d\n", err);
+ *enabled = 0;
+ } else {
+ if (reg_data & CTRL1_ALARM_ENABLED)
+ *enabled = 1;
+ else
+ *enabled = 0;
+ }
+
+ return err;
+}
+
+/* 0-disable, 1-enable */
+static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+
+ err = regmap_update_bits(rtc->rn5t618->regmap,
+ RN5T618_RTC_CTRL1,
+ CTRL1_ALARM_ENABLED,
+ enabled ? CTRL1_ALARM_ENABLED : 0);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ u8 buff[6];
+ unsigned int buff_cent;
+ int err;
+ int cent_flag;
+ unsigned int enabled_flag;
+
+ err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
+ if (err < 0) {
+ dev_err(dev, "failed to read time: %d\n", err);
+ return err;
+ }
+
+ if (buff_cent & 0x80)
+ cent_flag = 1;
+ else
+ cent_flag = 0;
+
+ err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
+ buff, sizeof(buff));
+ if (err)
+ return err;
+
+ err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1,
+ &enabled_flag);
+ if (err)
+ return err;
+
+ if (enabled_flag & CTRL1_ALARM_ENABLED)
+ enabled_flag = 1;
+ else
+ enabled_flag = 0;
+
+
+ buff[3] = buff[3] & 0x3f;
+
+ alrm->time.tm_sec = bcd2bin(buff[0]);
+ alrm->time.tm_min = bcd2bin(buff[1]);
+ alrm->time.tm_hour = bcd2bin(buff[2]);
+ alrm->time.tm_mday = bcd2bin(buff[3]);
+ alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
+ alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
+ alrm->enabled = enabled_flag;
+ dev_dbg(dev, "read alarm: %d/%d/%d %d:%d:%d\n",
+ (alrm->time.tm_mon), alrm->time.tm_mday, alrm->time.tm_year,
+ alrm->time.tm_hour, alrm->time.tm_min, alrm->time.tm_sec);
+
+ return 0;
+}
+
+static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+ u8 buff[6];
+ int err;
+ int cent_flag;
+
+ err = 0;
+ rc5t619_rtc_alarm_enable(dev, 0);
+ if (rtc->irq == -1)
+ return -EIO;
+
+ if (alrm->enabled == 0)
+ return 0;
+
+ if (alrm->time.tm_year >= 100)
+ cent_flag = 1;
+ else
+ cent_flag = 0;
+
+ alrm->time.tm_mon += 1;
+ buff[0] = bin2bcd(alrm->time.tm_sec);
+ buff[1] = bin2bcd(alrm->time.tm_min);
+ buff[2] = bin2bcd(alrm->time.tm_hour);
+ buff[3] = bin2bcd(alrm->time.tm_mday);
+ buff[4] = bin2bcd(alrm->time.tm_mon);
+ buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
+ buff[3] |= 0x80; /* set DAL_EXT */
+
+ err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
+ buff, sizeof(buff));
+ if (err) {
+ dev_err(dev, "unable to set alarm: %d\n", err);
+ return -EBUSY;
+ }
+
+ rc5t619_rtc_alarm_enable(dev, alrm->enabled);
+
+ return 0;
+}
+
+static const struct rtc_class_ops rc5t619_rtc_ops = {
+ .read_time = rc5t619_rtc_read_time,
+ .set_time = rc5t619_rtc_set_time,
+ .set_alarm = rc5t619_rtc_set_alarm,
+ .read_alarm = rc5t619_rtc_read_alarm,
+ .alarm_irq_enable = rc5t619_rtc_alarm_enable,
+};
+
+static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
+{
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+ /* clear alarm-D status bits.*/
+ return regmap_update_bits(rtc->rn5t618->regmap,
+ RN5T618_RTC_CTRL2,
+ CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
+}
+
+static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
+{
+ struct device *dev = data;
+ struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+ rc5t619_rtc_alarm_flag_clr(dev);
+
+ rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
+ return IRQ_HANDLED;
+}
+
+
+static int rc5t619_rtc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
+ struct rc5t619_rtc *rtc;
+ uint8_t pon_flag, alarm_flag;
+ int err;
+
+ rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
+ if (IS_ERR(rtc)) {
+ err = PTR_ERR(rtc);
+ dev_err(&pdev->dev, "no enough memory for rc5t619_rtc using\n");
+ return -ENOMEM;
+ }
+
+ rtc->rn5t618 = rn5t618;
+
+ dev_set_drvdata(dev, rtc);
+ rtc->irq = -1;
+
+ if (rn5t618->irq_data)
+ rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
+ RN5T618_IRQ_RTC);
+
+ if (rtc->irq < 0) {
+ dev_err(dev, "no irq specified, wakeup is disabled\n");
+ rtc->irq = -1;
+ }
+
+ /* get interrupt flag */
+ err = rc5t619_rtc_alarm_is_enabled(dev, &alarm_flag);
+ if (err)
+ return err;
+
+ /* get PON flag */
+ err = rc5t619_rtc_pon_get_clr(&pdev->dev, &pon_flag);
+ if (err) {
+ dev_err(&pdev->dev, "get PON flag error: %d\n", err);
+ return err;
+ }
+
+ /* using 24h-mode */
+ err = rc5t619_rtc_24hour_mode_set(&pdev->dev, 1);
+
+ /* disable rtc periodic function */
+ err = rc5t619_rtc_periodic_disable(&pdev->dev);
+ if (err) {
+ dev_err(&pdev->dev, "disable rtc periodic int: %d\n", err);
+ return err;
+ }
+
+ /* clearing RTC Adjust register */
+ err = rc5t619_rtc_clk_adjust(&pdev->dev, 0);
+ if (err) {
+ dev_err(&pdev->dev, "unable to program RTC_ADJUST: %d\n", err);
+ return err;
+ }
+
+ /* disable interrupt */
+ err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+ if (err) {
+ dev_err(&pdev->dev, "disable alarm interrupt: %d\n", err);
+ return err;
+ }
+
+ if (pon_flag) {
+ alarm_flag = 0;
+ err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
+ if (err) {
+ dev_err(&pdev->dev,
+ "pon=1 clear alarm flag error: %d\n", err);
+ return err;
+ }
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+ &rc5t619_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc->rtc)) {
+ err = PTR_ERR(rtc->rtc);
+ dev_err(dev, "RTC device register: err %d\n", err);
+ return err;
+ }
+
+ /* set interrupt and enable it */
+ if (rtc->irq != -1) {
+ err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
+ rc5t619_rtc_irq,
+ IRQF_ONESHOT,
+ "rtc-rc5t619",
+ &pdev->dev);
+ if (err < 0) {
+ dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
+ rtc->irq = -1;
+
+ err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+ if (err)
+ return err;
+
+ } else {
+ /* enable wake */
+ enable_irq_wake(rtc->irq);
+ /* enable alarm_d */
+ err = rc5t619_rtc_alarm_enable(&pdev->dev, alarm_flag);
+ if (err) {
+ dev_err(&pdev->dev, "failed rtc setup\n");
+ return -EBUSY;
+ }
+ }
+ } else {
+ /* system don't want to using alarm interrupt, so close it */
+ err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+ if (err) {
+ dev_err(&pdev->dev, "disable rtc alarm error\n");
+ return err;
+ }
+
+ dev_err(&pdev->dev, "ricoh61x interrupt is disabled\n");
+ }
+
+ return 0;
+}
+
+static int rc5t619_rtc_remove(struct platform_device *pdev)
+{
+ rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+
+ return 0;
+}
+
+static struct platform_driver rc5t619_rtc_driver = {
+ .driver = {
+ .name = "rc5t619-rtc",
+ },
+ .probe = rc5t619_rtc_probe,
+ .remove = rc5t619_rtc_remove,
+};
+
+module_platform_driver(rc5t619_rtc_driver);
+MODULE_ALIAS("platform:rc5t619-rtc");
+MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
+MODULE_LICENSE("GPL");
--
2.11.0
