[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/rtc/rtc-pcf85063.c b/src/kernel/linux/v4.19/drivers/rtc/rtc-pcf85063.c
new file mode 100644
index 0000000..283c233
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/rtc/rtc-pcf85063.c
@@ -0,0 +1,234 @@
+/*
+ * An I2C driver for the PCF85063 RTC
+ * Copyright 2014 Rose Technology
+ *
+ * Author: Søren Andersen <san@rosetechnology.dk>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * based on the other drivers in this same directory.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/module.h>
+
+/*
+ * Information for this driver was pulled from the following datasheets.
+ *
+ * http://www.nxp.com/documents/data_sheet/PCF85063A.pdf
+ * http://www.nxp.com/documents/data_sheet/PCF85063TP.pdf
+ *
+ * PCF85063A -- Rev. 6 — 18 November 2015
+ * PCF85063TP -- Rev. 4 — 6 May 2015
+*/
+
+#define PCF85063_REG_CTRL1 0x00 /* status */
+#define PCF85063_REG_CTRL1_STOP BIT(5)
+#define PCF85063_REG_CTRL2 0x01
+
+#define PCF85063_REG_SC 0x04 /* datetime */
+#define PCF85063_REG_SC_OS 0x80
+#define PCF85063_REG_MN 0x05
+#define PCF85063_REG_HR 0x06
+#define PCF85063_REG_DM 0x07
+#define PCF85063_REG_DW 0x08
+#define PCF85063_REG_MO 0x09
+#define PCF85063_REG_YR 0x0A
+
+static struct i2c_driver pcf85063_driver;
+
+static int pcf85063_stop_clock(struct i2c_client *client, u8 *ctrl1)
+{
+ int rc;
+ u8 reg;
+
+ rc = i2c_smbus_read_byte_data(client, PCF85063_REG_CTRL1);
+ if (rc < 0) {
+ dev_err(&client->dev, "Failing to stop the clock\n");
+ return -EIO;
+ }
+
+ /* stop the clock */
+ reg = rc | PCF85063_REG_CTRL1_STOP;
+
+ rc = i2c_smbus_write_byte_data(client, PCF85063_REG_CTRL1, reg);
+ if (rc < 0) {
+ dev_err(&client->dev, "Failing to stop the clock\n");
+ return -EIO;
+ }
+
+ *ctrl1 = reg;
+
+ return 0;
+}
+
+static int pcf85063_start_clock(struct i2c_client *client, u8 ctrl1)
+{
+ int rc;
+
+ /* start the clock */
+ ctrl1 &= ~PCF85063_REG_CTRL1_STOP;
+
+ rc = i2c_smbus_write_byte_data(client, PCF85063_REG_CTRL1, ctrl1);
+ if (rc < 0) {
+ dev_err(&client->dev, "Failing to start the clock\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int pcf85063_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int rc;
+ u8 regs[7];
+
+ /*
+ * while reading, the time/date registers are blocked and not updated
+ * anymore until the access is finished. To not lose a second
+ * event, the access must be finished within one second. So, read all
+ * time/date registers in one turn.
+ */
+ rc = i2c_smbus_read_i2c_block_data(client, PCF85063_REG_SC,
+ sizeof(regs), regs);
+ if (rc != sizeof(regs)) {
+ dev_err(&client->dev, "date/time register read error\n");
+ return -EIO;
+ }
+
+ /* if the clock has lost its power it makes no sense to use its time */
+ if (regs[0] & PCF85063_REG_SC_OS) {
+ dev_warn(&client->dev, "Power loss detected, invalid time\n");
+ return -EINVAL;
+ }
+
+ tm->tm_sec = bcd2bin(regs[0] & 0x7F);
+ tm->tm_min = bcd2bin(regs[1] & 0x7F);
+ tm->tm_hour = bcd2bin(regs[2] & 0x3F); /* rtc hr 0-23 */
+ tm->tm_mday = bcd2bin(regs[3] & 0x3F);
+ tm->tm_wday = regs[4] & 0x07;
+ tm->tm_mon = bcd2bin(regs[5] & 0x1F) - 1; /* rtc mn 1-12 */
+ tm->tm_year = bcd2bin(regs[6]);
+ tm->tm_year += 100;
+
+ return 0;
+}
+
+static int pcf85063_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int rc;
+ u8 regs[7];
+ u8 ctrl1;
+
+ if ((tm->tm_year < 100) || (tm->tm_year > 199))
+ return -EINVAL;
+
+ /*
+ * to accurately set the time, reset the divider chain and keep it in
+ * reset state until all time/date registers are written
+ */
+ rc = pcf85063_stop_clock(client, &ctrl1);
+ if (rc != 0)
+ return rc;
+
+ /* hours, minutes and seconds */
+ regs[0] = bin2bcd(tm->tm_sec) & 0x7F; /* clear OS flag */
+
+ regs[1] = bin2bcd(tm->tm_min);
+ regs[2] = bin2bcd(tm->tm_hour);
+
+ /* Day of month, 1 - 31 */
+ regs[3] = bin2bcd(tm->tm_mday);
+
+ /* Day, 0 - 6 */
+ regs[4] = tm->tm_wday & 0x07;
+
+ /* month, 1 - 12 */
+ regs[5] = bin2bcd(tm->tm_mon + 1);
+
+ /* year and century */
+ regs[6] = bin2bcd(tm->tm_year - 100);
+
+ /* write all registers at once */
+ rc = i2c_smbus_write_i2c_block_data(client, PCF85063_REG_SC,
+ sizeof(regs), regs);
+ if (rc < 0) {
+ dev_err(&client->dev, "date/time register write error\n");
+ return rc;
+ }
+
+ /*
+ * Write the control register as a separate action since the size of
+ * the register space is different between the PCF85063TP and
+ * PCF85063A devices. The rollover point can not be used.
+ */
+ rc = pcf85063_start_clock(client, ctrl1);
+ if (rc != 0)
+ return rc;
+
+ return 0;
+}
+
+static const struct rtc_class_ops pcf85063_rtc_ops = {
+ .read_time = pcf85063_rtc_read_time,
+ .set_time = pcf85063_rtc_set_time
+};
+
+static int pcf85063_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct rtc_device *rtc;
+ int err;
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
+
+ err = i2c_smbus_read_byte_data(client, PCF85063_REG_CTRL1);
+ if (err < 0) {
+ dev_err(&client->dev, "RTC chip is not present\n");
+ return err;
+ }
+
+ rtc = devm_rtc_device_register(&client->dev,
+ pcf85063_driver.driver.name,
+ &pcf85063_rtc_ops, THIS_MODULE);
+
+ return PTR_ERR_OR_ZERO(rtc);
+}
+
+static const struct i2c_device_id pcf85063_id[] = {
+ { "pcf85063", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcf85063_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pcf85063_of_match[] = {
+ { .compatible = "nxp,pcf85063" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pcf85063_of_match);
+#endif
+
+static struct i2c_driver pcf85063_driver = {
+ .driver = {
+ .name = "rtc-pcf85063",
+ .of_match_table = of_match_ptr(pcf85063_of_match),
+ },
+ .probe = pcf85063_probe,
+ .id_table = pcf85063_id,
+};
+
+module_i2c_driver(pcf85063_driver);
+
+MODULE_AUTHOR("Søren Andersen <san@rosetechnology.dk>");
+MODULE_DESCRIPTION("PCF85063 RTC driver");
+MODULE_LICENSE("GPL");