Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 284 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-pcf50633.c b/drivers/rtc/rtc-pcf50633.c
new file mode 100644
index 0000000000..23edd11aa4
--- /dev/null
+++ b/drivers/rtc/rtc-pcf50633.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* NXP PCF50633 RTC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50633 driver mainly by
+ * Harald Welte, Andy Green and Werner Almesberger
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/err.h>
+
+#include <linux/mfd/pcf50633/core.h>
+
+#define PCF50633_REG_RTCSC	0x59 /* Second */
+#define PCF50633_REG_RTCMN	0x5a /* Minute */
+#define PCF50633_REG_RTCHR	0x5b /* Hour */
+#define PCF50633_REG_RTCWD	0x5c /* Weekday */
+#define PCF50633_REG_RTCDT	0x5d /* Day */
+#define PCF50633_REG_RTCMT	0x5e /* Month */
+#define PCF50633_REG_RTCYR	0x5f /* Year */
+#define PCF50633_REG_RTCSCA	0x60 /* Alarm Second */
+#define PCF50633_REG_RTCMNA	0x61 /* Alarm Minute */
+#define PCF50633_REG_RTCHRA	0x62 /* Alarm Hour */
+#define PCF50633_REG_RTCWDA	0x63 /* Alarm Weekday */
+#define PCF50633_REG_RTCDTA	0x64 /* Alarm Day */
+#define PCF50633_REG_RTCMTA	0x65 /* Alarm Month */
+#define PCF50633_REG_RTCYRA	0x66 /* Alarm Year */
+
+enum pcf50633_time_indexes {
+	PCF50633_TI_SEC,
+	PCF50633_TI_MIN,
+	PCF50633_TI_HOUR,
+	PCF50633_TI_WKDAY,
+	PCF50633_TI_DAY,
+	PCF50633_TI_MONTH,
+	PCF50633_TI_YEAR,
+	PCF50633_TI_EXTENT /* always last */
+};
+
+struct pcf50633_time {
+	u_int8_t time[PCF50633_TI_EXTENT];
+};
+
+struct pcf50633_rtc {
+	int alarm_enabled;
+	int alarm_pending;
+
+	struct pcf50633 *pcf;
+	struct rtc_device *rtc_dev;
+};
+
+static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
+{
+	rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
+	rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
+	rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
+	rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
+	rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
+	rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
+	rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
+}
+
+static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
+{
+	pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
+	pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
+	pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
+	pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
+	pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
+	pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
+	pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
+}
+
+static int
+pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
+	int err;
+
+	if (enabled)
+		err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+	else
+		err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	if (err < 0)
+		return err;
+
+	rtc->alarm_enabled = enabled;
+
+	return 0;
+}
+
+static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf50633_rtc *rtc;
+	struct pcf50633_time pcf_tm;
+	int ret;
+
+	rtc = dev_get_drvdata(dev);
+
+	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
+					    PCF50633_TI_EXTENT,
+					    &pcf_tm.time[0]);
+	if (ret != PCF50633_TI_EXTENT) {
+		dev_err(dev, "Failed to read time\n");
+		return -EIO;
+	}
+
+	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+		pcf_tm.time[PCF50633_TI_DAY],
+		pcf_tm.time[PCF50633_TI_MONTH],
+		pcf_tm.time[PCF50633_TI_YEAR],
+		pcf_tm.time[PCF50633_TI_HOUR],
+		pcf_tm.time[PCF50633_TI_MIN],
+		pcf_tm.time[PCF50633_TI_SEC]);
+
+	pcf2rtc_time(tm, &pcf_tm);
+
+	dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
+
+	return 0;
+}
+
+static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf50633_rtc *rtc;
+	struct pcf50633_time pcf_tm;
+	int alarm_masked, ret = 0;
+
+	rtc = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
+
+	rtc2pcf_time(&pcf_tm, tm);
+
+	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+		pcf_tm.time[PCF50633_TI_DAY],
+		pcf_tm.time[PCF50633_TI_MONTH],
+		pcf_tm.time[PCF50633_TI_YEAR],
+		pcf_tm.time[PCF50633_TI_HOUR],
+		pcf_tm.time[PCF50633_TI_MIN],
+		pcf_tm.time[PCF50633_TI_SEC]);
+
+
+	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	if (!alarm_masked)
+		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	/* Returns 0 on success */
+	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
+					     PCF50633_TI_EXTENT,
+					     &pcf_tm.time[0]);
+
+	if (!alarm_masked)
+		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	return ret;
+}
+
+static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct pcf50633_rtc *rtc;
+	struct pcf50633_time pcf_tm;
+	int ret = 0;
+
+	rtc = dev_get_drvdata(dev);
+
+	alrm->enabled = rtc->alarm_enabled;
+	alrm->pending = rtc->alarm_pending;
+
+	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
+				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+	if (ret != PCF50633_TI_EXTENT) {
+		dev_err(dev, "Failed to read time\n");
+		return -EIO;
+	}
+
+	pcf2rtc_time(&alrm->time, &pcf_tm);
+
+	return rtc_valid_tm(&alrm->time);
+}
+
+static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct pcf50633_rtc *rtc;
+	struct pcf50633_time pcf_tm;
+	int alarm_masked, ret = 0;
+
+	rtc = dev_get_drvdata(dev);
+
+	rtc2pcf_time(&pcf_tm, &alrm->time);
+
+	/* do like mktime does and ignore tm_wday */
+	pcf_tm.time[PCF50633_TI_WKDAY] = 7;
+
+	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	/* disable alarm interrupt */
+	if (!alarm_masked)
+		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+	/* Returns 0 on success */
+	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
+				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+	if (!alrm->enabled)
+		rtc->alarm_pending = 0;
+
+	if (!alarm_masked || alrm->enabled)
+		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+	rtc->alarm_enabled = alrm->enabled;
+
+	return ret;
+}
+
+static const struct rtc_class_ops pcf50633_rtc_ops = {
+	.read_time		= pcf50633_rtc_read_time,
+	.set_time		= pcf50633_rtc_set_time,
+	.read_alarm		= pcf50633_rtc_read_alarm,
+	.set_alarm		= pcf50633_rtc_set_alarm,
+	.alarm_irq_enable	= pcf50633_rtc_alarm_irq_enable,
+};
+
+static void pcf50633_rtc_irq(int irq, void *data)
+{
+	struct pcf50633_rtc *rtc = data;
+
+	rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+	rtc->alarm_pending = 1;
+}
+
+static int pcf50633_rtc_probe(struct platform_device *pdev)
+{
+	struct pcf50633_rtc *rtc;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
+	platform_set_drvdata(pdev, rtc);
+	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
+				&pcf50633_rtc_ops, THIS_MODULE);
+
+	if (IS_ERR(rtc->rtc_dev))
+		return PTR_ERR(rtc->rtc_dev);
+
+	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
+					pcf50633_rtc_irq, rtc);
+	return 0;
+}
+
+static void pcf50633_rtc_remove(struct platform_device *pdev)
+{
+	struct pcf50633_rtc *rtc;
+
+	rtc = platform_get_drvdata(pdev);
+	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
+}
+
+static struct platform_driver pcf50633_rtc_driver = {
+	.driver = {
+		.name = "pcf50633-rtc",
+	},
+	.probe = pcf50633_rtc_probe,
+	.remove_new = pcf50633_rtc_remove,
+};
+
+module_platform_driver(pcf50633_rtc_driver);
+
+MODULE_DESCRIPTION("PCF50633 RTC driver");
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_LICENSE("GPL");
+