Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 435 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c
new file mode 100644
index 0000000000..f44e212c07
--- /dev/null
+++ b/drivers/rtc/rtc-rx8010.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the Epson RTC module RX-8010 SJ
+ *
+ * Copyright(C) Timesys Corporation 2015
+ * Copyright(C) General Electric Company 2015
+ */
+
+#include <linux/bcd.h>
+#include <linux/bitops.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+
+#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_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		0x31
+#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)
+
+static const struct i2c_device_id rx8010_id[] = {
+	{ "rx8010", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, rx8010_id);
+
+static const __maybe_unused struct of_device_id rx8010_of_match[] = {
+	{ .compatible = "epson,rx8010" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rx8010_of_match);
+
+struct rx8010_data {
+	struct regmap *regs;
+	struct rtc_device *rtc;
+	u8 ctrlreg;
+};
+
+static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
+{
+	struct i2c_client *client = dev_id;
+	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
+	int flagreg, err;
+
+	rtc_lock(rx8010->rtc);
+
+	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
+	if (err) {
+		rtc_unlock(rx8010->rtc);
+		return IRQ_NONE;
+	}
+
+	if (flagreg & RX8010_FLAG_VLF)
+		dev_warn(&client->dev, "Frequency stop detected\n");
+
+	if (flagreg & RX8010_FLAG_TF) {
+		flagreg &= ~RX8010_FLAG_TF;
+		rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
+	}
+
+	if (flagreg & RX8010_FLAG_AF) {
+		flagreg &= ~RX8010_FLAG_AF;
+		rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
+	}
+
+	if (flagreg & RX8010_FLAG_UF) {
+		flagreg &= ~RX8010_FLAG_UF;
+		rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
+	}
+
+	err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
+	rtc_unlock(rx8010->rtc);
+	return err ? IRQ_NONE : IRQ_HANDLED;
+}
+
+static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	u8 date[RX8010_YEAR - RX8010_SEC + 1];
+	int flagreg, err;
+
+	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
+	if (err)
+		return err;
+
+	if (flagreg & RX8010_FLAG_VLF) {
+		dev_warn(dev, "Frequency stop detected\n");
+		return -EINVAL;
+	}
+
+	err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date));
+	if (err)
+		return err;
+
+	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
+	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
+	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
+	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
+	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
+	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
+	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
+
+	return 0;
+}
+
+static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	u8 date[RX8010_YEAR - RX8010_SEC + 1];
+	int err;
+
+	/* set STOP bit before changing clock/calendar */
+	err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
+	if (err)
+		return err;
+
+	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
+	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
+	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
+	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
+	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
+	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
+	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
+
+	err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date));
+	if (err)
+		return err;
+
+	/* clear STOP bit after changing clock/calendar */
+	err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
+	if (err)
+		return err;
+
+	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int rx8010_init(struct device *dev)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	u8 ctrl[2];
+	int need_clear = 0, err;
+
+	/* Initialize reserved registers as specified in datasheet */
+	err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8);
+	if (err)
+		return err;
+
+	err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00);
+	if (err)
+		return err;
+
+	err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08);
+	if (err)
+		return err;
+
+	err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00);
+	if (err)
+		return err;
+
+	err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2);
+	if (err)
+		return err;
+
+	if (ctrl[0] & RX8010_FLAG_VLF)
+		dev_warn(dev, "Frequency stop was detected\n");
+
+	if (ctrl[0] & RX8010_FLAG_AF) {
+		dev_warn(dev, "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);
+		err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]);
+		if (err)
+			return err;
+	}
+
+	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
+
+	return 0;
+}
+
+static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	u8 alarmvals[3];
+	int flagreg, err;
+
+	err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3);
+	if (err)
+		return err;
+
+	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
+	if (err)
+		return err;
+
+	t->time.tm_sec = 0;
+	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
+	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
+
+	if (!(alarmvals[2] & RX8010_ALARM_AE))
+		t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
+
+	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
+	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
+
+	return 0;
+}
+
+static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	u8 alarmvals[3];
+	int err;
+
+	if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
+		rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
+		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
+		if (err)
+			return err;
+	}
+
+	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
+	if (err)
+		return err;
+
+	alarmvals[0] = bin2bcd(t->time.tm_min);
+	alarmvals[1] = bin2bcd(t->time.tm_hour);
+	alarmvals[2] = bin2bcd(t->time.tm_mday);
+
+	err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2);
+	if (err)
+		return err;
+
+	err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA);
+	if (err)
+		return err;
+
+	if (alarmvals[2] == 0)
+		alarmvals[2] |= RX8010_ALARM_AE;
+
+	err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]);
+	if (err)
+		return err;
+
+	if (t->enabled) {
+		if (rx8010->rtc->uie_rtctimer.enabled)
+			rx8010->ctrlreg |= RX8010_CTRL_UIE;
+		if (rx8010->rtc->aie_timer.enabled)
+			rx8010->ctrlreg |=
+				(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
+
+		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int rx8010_alarm_irq_enable(struct device *dev,
+				   unsigned int enabled)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	int err;
+	u8 ctrl;
+
+	ctrl = rx8010->ctrlreg;
+
+	if (enabled) {
+		if (rx8010->rtc->uie_rtctimer.enabled)
+			ctrl |= RX8010_CTRL_UIE;
+		if (rx8010->rtc->aie_timer.enabled)
+			ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
+	} else {
+		if (!rx8010->rtc->uie_rtctimer.enabled)
+			ctrl &= ~RX8010_CTRL_UIE;
+		if (!rx8010->rtc->aie_timer.enabled)
+			ctrl &= ~RX8010_CTRL_AIE;
+	}
+
+	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
+	if (err)
+		return err;
+
+	if (ctrl != rx8010->ctrlreg) {
+		rx8010->ctrlreg = ctrl;
+		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
+	int tmp, flagreg, err;
+
+	switch (cmd) {
+	case RTC_VL_READ:
+		err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
+		if (err)
+			return err;
+
+		tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
+		return put_user(tmp, (unsigned int __user *)arg);
+
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+static const struct rtc_class_ops rx8010_rtc_ops = {
+	.read_time = rx8010_get_time,
+	.set_time = rx8010_set_time,
+	.ioctl = rx8010_ioctl,
+	.read_alarm = rx8010_read_alarm,
+	.set_alarm = rx8010_set_alarm,
+	.alarm_irq_enable = rx8010_alarm_irq_enable,
+};
+
+static const struct regmap_config rx8010_regmap_config = {
+	.name = "rx8010-rtc",
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int rx8010_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct rx8010_data *rx8010;
+	int err = 0;
+
+	rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL);
+	if (!rx8010)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, rx8010);
+
+	rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config);
+	if (IS_ERR(rx8010->regs))
+		return PTR_ERR(rx8010->regs);
+
+	err = rx8010_init(dev);
+	if (err)
+		return err;
+
+	rx8010->rtc = devm_rtc_allocate_device(dev);
+	if (IS_ERR(rx8010->rtc))
+		return PTR_ERR(rx8010->rtc);
+
+	if (client->irq > 0) {
+		unsigned long irqflags = IRQF_TRIGGER_LOW;
+
+		if (dev_fwnode(&client->dev))
+			irqflags = 0;
+
+		err = devm_request_threaded_irq(dev, client->irq, NULL,
+						rx8010_irq_1_handler,
+						irqflags | IRQF_ONESHOT,
+						"rx8010", client);
+		if (err) {
+			dev_err(dev, "unable to request IRQ\n");
+			return err;
+		}
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
+	}
+
+	rx8010->rtc->ops = &rx8010_rtc_ops;
+	rx8010->rtc->max_user_freq = 1;
+	rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	return devm_rtc_register_device(rx8010->rtc);
+}
+
+static struct i2c_driver rx8010_driver = {
+	.driver = {
+		.name = "rtc-rx8010",
+		.of_match_table = of_match_ptr(rx8010_of_match),
+	},
+	.probe		= rx8010_probe,
+	.id_table	= rx8010_id,
+};
+
+module_i2c_driver(rx8010_driver);
+
+MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
+MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
+MODULE_LICENSE("GPL v2");