Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 496 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
new file mode 100644
index 0000000000..540042b9ee
--- /dev/null
+++ b/drivers/rtc/rtc-pcf85363.c
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/rtc/rtc-pcf85363.c
+ *
+ * Driver for NXP PCF85363 real-time clock.
+ *
+ * Copyright (C) 2017 Eric Nelson
+ */
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/rtc.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/bcd.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+/*
+ * Date/Time registers
+ */
+#define DT_100THS	0x00
+#define DT_SECS		0x01
+#define DT_MINUTES	0x02
+#define DT_HOURS	0x03
+#define DT_DAYS		0x04
+#define DT_WEEKDAYS	0x05
+#define DT_MONTHS	0x06
+#define DT_YEARS	0x07
+
+/*
+ * Alarm registers
+ */
+#define DT_SECOND_ALM1	0x08
+#define DT_MINUTE_ALM1	0x09
+#define DT_HOUR_ALM1	0x0a
+#define DT_DAY_ALM1	0x0b
+#define DT_MONTH_ALM1	0x0c
+#define DT_MINUTE_ALM2	0x0d
+#define DT_HOUR_ALM2	0x0e
+#define DT_WEEKDAY_ALM2	0x0f
+#define DT_ALARM_EN	0x10
+
+/*
+ * Time stamp registers
+ */
+#define DT_TIMESTAMP1	0x11
+#define DT_TIMESTAMP2	0x17
+#define DT_TIMESTAMP3	0x1d
+#define DT_TS_MODE	0x23
+
+/*
+ * control registers
+ */
+#define CTRL_OFFSET	0x24
+#define CTRL_OSCILLATOR	0x25
+#define CTRL_BATTERY	0x26
+#define CTRL_PIN_IO	0x27
+#define CTRL_FUNCTION	0x28
+#define CTRL_INTA_EN	0x29
+#define CTRL_INTB_EN	0x2a
+#define CTRL_FLAGS	0x2b
+#define CTRL_RAMBYTE	0x2c
+#define CTRL_WDOG	0x2d
+#define CTRL_STOP_EN	0x2e
+#define CTRL_RESETS	0x2f
+#define CTRL_RAM	0x40
+
+#define ALRM_SEC_A1E	BIT(0)
+#define ALRM_MIN_A1E	BIT(1)
+#define ALRM_HR_A1E	BIT(2)
+#define ALRM_DAY_A1E	BIT(3)
+#define ALRM_MON_A1E	BIT(4)
+#define ALRM_MIN_A2E	BIT(5)
+#define ALRM_HR_A2E	BIT(6)
+#define ALRM_DAY_A2E	BIT(7)
+
+#define INT_WDIE	BIT(0)
+#define INT_BSIE	BIT(1)
+#define INT_TSRIE	BIT(2)
+#define INT_A2IE	BIT(3)
+#define INT_A1IE	BIT(4)
+#define INT_OIE		BIT(5)
+#define INT_PIE		BIT(6)
+#define INT_ILP		BIT(7)
+
+#define FLAGS_TSR1F	BIT(0)
+#define FLAGS_TSR2F	BIT(1)
+#define FLAGS_TSR3F	BIT(2)
+#define FLAGS_BSF	BIT(3)
+#define FLAGS_WDF	BIT(4)
+#define FLAGS_A1F	BIT(5)
+#define FLAGS_A2F	BIT(6)
+#define FLAGS_PIF	BIT(7)
+
+#define PIN_IO_INTAPM	GENMASK(1, 0)
+#define PIN_IO_INTA_CLK	0
+#define PIN_IO_INTA_BAT	1
+#define PIN_IO_INTA_OUT	2
+#define PIN_IO_INTA_HIZ	3
+
+#define OSC_CAP_SEL	GENMASK(1, 0)
+#define OSC_CAP_6000	0x01
+#define OSC_CAP_12500	0x02
+
+#define STOP_EN_STOP	BIT(0)
+
+#define RESET_CPR	0xa4
+
+#define NVRAM_SIZE	0x40
+
+struct pcf85363 {
+	struct rtc_device	*rtc;
+	struct regmap		*regmap;
+};
+
+struct pcf85x63_config {
+	struct regmap_config regmap;
+	unsigned int num_nvram;
+};
+
+static int pcf85363_load_capacitance(struct pcf85363 *pcf85363, struct device_node *node)
+{
+	u32 load = 7000;
+	u8 value = 0;
+
+	of_property_read_u32(node, "quartz-load-femtofarads", &load);
+
+	switch (load) {
+	default:
+		dev_warn(&pcf85363->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
+			 load);
+		fallthrough;
+	case 7000:
+		break;
+	case 6000:
+		value = OSC_CAP_6000;
+		break;
+	case 12500:
+		value = OSC_CAP_12500;
+		break;
+	}
+
+	return regmap_update_bits(pcf85363->regmap, CTRL_OSCILLATOR,
+				  OSC_CAP_SEL, value);
+}
+
+static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
+	unsigned char buf[DT_YEARS + 1];
+	int ret, len = sizeof(buf);
+
+	/* read the RTC date and time registers all at once */
+	ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len);
+	if (ret) {
+		dev_err(dev, "%s: error %d\n", __func__, ret);
+		return ret;
+	}
+
+	tm->tm_year = bcd2bin(buf[DT_YEARS]);
+	/* adjust for 1900 base of rtc_time */
+	tm->tm_year += 100;
+
+	tm->tm_wday = buf[DT_WEEKDAYS] & 7;
+	buf[DT_SECS] &= 0x7F;
+	tm->tm_sec = bcd2bin(buf[DT_SECS]);
+	buf[DT_MINUTES] &= 0x7F;
+	tm->tm_min = bcd2bin(buf[DT_MINUTES]);
+	tm->tm_hour = bcd2bin(buf[DT_HOURS]);
+	tm->tm_mday = bcd2bin(buf[DT_DAYS]);
+	tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1;
+
+	return 0;
+}
+
+static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
+	unsigned char tmp[11];
+	unsigned char *buf = &tmp[2];
+	int ret;
+
+	tmp[0] = STOP_EN_STOP;
+	tmp[1] = RESET_CPR;
+
+	buf[DT_100THS] = 0;
+	buf[DT_SECS] = bin2bcd(tm->tm_sec);
+	buf[DT_MINUTES] = bin2bcd(tm->tm_min);
+	buf[DT_HOURS] = bin2bcd(tm->tm_hour);
+	buf[DT_DAYS] = bin2bcd(tm->tm_mday);
+	buf[DT_WEEKDAYS] = tm->tm_wday;
+	buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1);
+	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);
+
+	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
+				tmp, 2);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_write(pcf85363->regmap, DT_100THS,
+				buf, sizeof(tmp) - 2);
+	if (ret)
+		return ret;
+
+	return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0);
+}
+
+static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
+	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
+	unsigned int val;
+	int ret;
+
+	ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
+			       sizeof(buf));
+	if (ret)
+		return ret;
+
+	alrm->time.tm_sec = bcd2bin(buf[0]);
+	alrm->time.tm_min = bcd2bin(buf[1]);
+	alrm->time.tm_hour = bcd2bin(buf[2]);
+	alrm->time.tm_mday = bcd2bin(buf[3]);
+	alrm->time.tm_mon = bcd2bin(buf[4]) - 1;
+
+	ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
+	if (ret)
+		return ret;
+
+	alrm->enabled =  !!(val & INT_A1IE);
+
+	return 0;
+}
+
+static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
+					  int enabled)
+{
+	unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E |
+				   ALRM_DAY_A1E | ALRM_MON_A1E;
+	int ret;
+
+	ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
+				 enabled ? alarm_flags : 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
+				 INT_A1IE, enabled ? INT_A1IE : 0);
+
+	if (ret || enabled)
+		return ret;
+
+	/* clear current flags */
+	return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
+}
+
+static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
+					 unsigned int enabled)
+{
+	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
+
+	return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
+}
+
+static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
+	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
+	int ret;
+
+	buf[0] = bin2bcd(alrm->time.tm_sec);
+	buf[1] = bin2bcd(alrm->time.tm_min);
+	buf[2] = bin2bcd(alrm->time.tm_hour);
+	buf[3] = bin2bcd(alrm->time.tm_mday);
+	buf[4] = bin2bcd(alrm->time.tm_mon + 1);
+
+	/*
+	 * Disable the alarm interrupt before changing the value to avoid
+	 * spurious interrupts
+	 */
+	ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
+				sizeof(buf));
+	if (ret)
+		return ret;
+
+	return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
+}
+
+static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
+{
+	struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
+	unsigned int flags;
+	int err;
+
+	err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
+	if (err)
+		return IRQ_NONE;
+
+	if (flags & FLAGS_A1F) {
+		rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF);
+		regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static const struct rtc_class_ops rtc_ops = {
+	.read_time	= pcf85363_rtc_read_time,
+	.set_time	= pcf85363_rtc_set_time,
+	.read_alarm	= pcf85363_rtc_read_alarm,
+	.set_alarm	= pcf85363_rtc_set_alarm,
+	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
+};
+
+static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val,
+			       size_t bytes)
+{
+	struct pcf85363 *pcf85363 = priv;
+
+	return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset,
+				val, bytes);
+}
+
+static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val,
+				size_t bytes)
+{
+	struct pcf85363 *pcf85363 = priv;
+
+	return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset,
+				 val, bytes);
+}
+
+static int pcf85x63_nvram_read(void *priv, unsigned int offset, void *val,
+			       size_t bytes)
+{
+	struct pcf85363 *pcf85363 = priv;
+	unsigned int tmp_val;
+	int ret;
+
+	ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val);
+	(*(unsigned char *) val) = (unsigned char) tmp_val;
+
+	return ret;
+}
+
+static int pcf85x63_nvram_write(void *priv, unsigned int offset, void *val,
+				size_t bytes)
+{
+	struct pcf85363 *pcf85363 = priv;
+	unsigned char tmp_val;
+
+	tmp_val = *((unsigned char *)val);
+	return regmap_write(pcf85363->regmap, CTRL_RAMBYTE,
+				(unsigned int)tmp_val);
+}
+
+static const struct pcf85x63_config pcf_85263_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x2f,
+	},
+	.num_nvram = 1
+};
+
+static const struct pcf85x63_config pcf_85363_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x7f,
+	},
+	.num_nvram = 2
+};
+
+static int pcf85363_probe(struct i2c_client *client)
+{
+	struct pcf85363 *pcf85363;
+	const struct pcf85x63_config *config = &pcf_85363_config;
+	const void *data = of_device_get_match_data(&client->dev);
+	static struct nvmem_config nvmem_cfg[] = {
+		{
+			.name = "pcf85x63-",
+			.word_size = 1,
+			.stride = 1,
+			.size = 1,
+			.reg_read = pcf85x63_nvram_read,
+			.reg_write = pcf85x63_nvram_write,
+		}, {
+			.name = "pcf85363-",
+			.word_size = 1,
+			.stride = 1,
+			.size = NVRAM_SIZE,
+			.reg_read = pcf85363_nvram_read,
+			.reg_write = pcf85363_nvram_write,
+		},
+	};
+	int ret, i, err;
+	bool wakeup_source;
+
+	if (data)
+		config = data;
+
+	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
+				GFP_KERNEL);
+	if (!pcf85363)
+		return -ENOMEM;
+
+	pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
+	if (IS_ERR(pcf85363->regmap)) {
+		dev_err(&client->dev, "regmap allocation failed\n");
+		return PTR_ERR(pcf85363->regmap);
+	}
+
+	i2c_set_clientdata(client, pcf85363);
+
+	pcf85363->rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(pcf85363->rtc))
+		return PTR_ERR(pcf85363->rtc);
+
+	err = pcf85363_load_capacitance(pcf85363, client->dev.of_node);
+	if (err < 0)
+		dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
+			 err);
+
+	pcf85363->rtc->ops = &rtc_ops;
+	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	wakeup_source = device_property_read_bool(&client->dev,
+						  "wakeup-source");
+	if (client->irq > 0 || wakeup_source) {
+		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
+		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
+				   PIN_IO_INTAPM, PIN_IO_INTA_OUT);
+	}
+
+	if (client->irq > 0) {
+		unsigned long irqflags = IRQF_TRIGGER_LOW;
+
+		if (dev_fwnode(&client->dev))
+			irqflags = 0;
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+						NULL, pcf85363_rtc_handle_irq,
+						irqflags | IRQF_ONESHOT,
+						"pcf85363", client);
+		if (ret) {
+			dev_warn(&client->dev,
+				 "unable to request IRQ, alarms disabled\n");
+			client->irq = 0;
+		}
+	}
+
+	if (client->irq > 0 || wakeup_source) {
+		device_init_wakeup(&client->dev, true);
+		set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
+	}
+
+	ret = devm_rtc_register_device(pcf85363->rtc);
+
+	for (i = 0; i < config->num_nvram; i++) {
+		nvmem_cfg[i].priv = pcf85363;
+		devm_rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]);
+	}
+
+	return ret;
+}
+
+static const __maybe_unused struct of_device_id dev_ids[] = {
+	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
+	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dev_ids);
+
+static struct i2c_driver pcf85363_driver = {
+	.driver	= {
+		.name	= "pcf85363",
+		.of_match_table = of_match_ptr(dev_ids),
+	},
+	.probe = pcf85363_probe,
+};
+
+module_i2c_driver(pcf85363_driver);
+
+MODULE_AUTHOR("Eric Nelson");
+MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
+MODULE_LICENSE("GPL");