Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 220 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
new file mode 100644
index 000000000..6ae8b9a29
--- /dev/null
+++ b/drivers/rtc/rtc-ds1742.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * An rtc driver for the Dallas DS1742
+ *
+ * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ *
+ * Copyright (C) 2006 Torsten Ertbjerg Rasmussen <tr@newtec.dk>
+ *  - nvram size determined from resource
+ *  - this ds1742 driver now supports ds1743.
+ */
+
+#include <linux/bcd.h>
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/rtc.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#define RTC_SIZE		8
+
+#define RTC_CONTROL		0
+#define RTC_CENTURY		0
+#define RTC_SECONDS		1
+#define RTC_MINUTES		2
+#define RTC_HOURS		3
+#define RTC_DAY			4
+#define RTC_DATE		5
+#define RTC_MONTH		6
+#define RTC_YEAR		7
+
+#define RTC_CENTURY_MASK	0x3f
+#define RTC_SECONDS_MASK	0x7f
+#define RTC_DAY_MASK		0x07
+
+/* Bits in the Control/Century register */
+#define RTC_WRITE		0x80
+#define RTC_READ		0x40
+
+/* Bits in the Seconds register */
+#define RTC_STOP		0x80
+
+/* Bits in the Day register */
+#define RTC_BATT_FLAG		0x80
+
+struct rtc_plat_data {
+	void __iomem *ioaddr_nvram;
+	void __iomem *ioaddr_rtc;
+	unsigned long last_jiffies;
+};
+
+static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+	void __iomem *ioaddr = pdata->ioaddr_rtc;
+	u8 century;
+
+	century = bin2bcd((tm->tm_year + 1900) / 100);
+
+	writeb(RTC_WRITE, ioaddr + RTC_CONTROL);
+
+	writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);
+	writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);
+	writeb(bin2bcd(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
+	writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);
+	writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);
+	writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);
+	writeb(bin2bcd(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
+
+	/* RTC_CENTURY and RTC_CONTROL share same register */
+	writeb(RTC_WRITE | (century & RTC_CENTURY_MASK), ioaddr + RTC_CENTURY);
+	writeb(century & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
+	return 0;
+}
+
+static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+	void __iomem *ioaddr = pdata->ioaddr_rtc;
+	unsigned int year, month, day, hour, minute, second, week;
+	unsigned int century;
+
+	/* give enough time to update RTC in case of continuous read */
+	if (pdata->last_jiffies == jiffies)
+		msleep(1);
+	pdata->last_jiffies = jiffies;
+	writeb(RTC_READ, ioaddr + RTC_CONTROL);
+	second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK;
+	minute = readb(ioaddr + RTC_MINUTES);
+	hour = readb(ioaddr + RTC_HOURS);
+	day = readb(ioaddr + RTC_DATE);
+	week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK;
+	month = readb(ioaddr + RTC_MONTH);
+	year = readb(ioaddr + RTC_YEAR);
+	century = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
+	writeb(0, ioaddr + RTC_CONTROL);
+	tm->tm_sec = bcd2bin(second);
+	tm->tm_min = bcd2bin(minute);
+	tm->tm_hour = bcd2bin(hour);
+	tm->tm_mday = bcd2bin(day);
+	tm->tm_wday = bcd2bin(week);
+	tm->tm_mon = bcd2bin(month) - 1;
+	/* year is 1900 + tm->tm_year */
+	tm->tm_year = bcd2bin(year) + bcd2bin(century) * 100 - 1900;
+
+	return 0;
+}
+
+static const struct rtc_class_ops ds1742_rtc_ops = {
+	.read_time	= ds1742_rtc_read_time,
+	.set_time	= ds1742_rtc_set_time,
+};
+
+static int ds1742_nvram_read(void *priv, unsigned int pos, void *val,
+			     size_t bytes)
+{
+	struct rtc_plat_data *pdata = priv;
+	void __iomem *ioaddr = pdata->ioaddr_nvram;
+	u8 *buf = val;
+
+	for (; bytes; bytes--)
+		*buf++ = readb(ioaddr + pos++);
+	return 0;
+}
+
+static int ds1742_nvram_write(void *priv, unsigned int pos, void *val,
+			      size_t bytes)
+{
+	struct rtc_plat_data *pdata = priv;
+	void __iomem *ioaddr = pdata->ioaddr_nvram;
+	u8 *buf = val;
+
+	for (; bytes; bytes--)
+		writeb(*buf++, ioaddr + pos++);
+	return 0;
+}
+
+static int ds1742_rtc_probe(struct platform_device *pdev)
+{
+	struct rtc_device *rtc;
+	struct resource *res;
+	unsigned int cen, sec;
+	struct rtc_plat_data *pdata;
+	void __iomem *ioaddr;
+	int ret = 0;
+	struct nvmem_config nvmem_cfg = {
+		.name = "ds1742_nvram",
+		.reg_read = ds1742_nvram_read,
+		.reg_write = ds1742_nvram_write,
+	};
+
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	ioaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(ioaddr))
+		return PTR_ERR(ioaddr);
+
+	pdata->ioaddr_nvram = ioaddr;
+	pdata->ioaddr_rtc = ioaddr + resource_size(res) - RTC_SIZE;
+
+	nvmem_cfg.size = resource_size(res) - RTC_SIZE;
+	nvmem_cfg.priv = pdata;
+
+	/* turn RTC on if it was not on */
+	ioaddr = pdata->ioaddr_rtc;
+	sec = readb(ioaddr + RTC_SECONDS);
+	if (sec & RTC_STOP) {
+		sec &= RTC_SECONDS_MASK;
+		cen = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
+		writeb(RTC_WRITE, ioaddr + RTC_CONTROL);
+		writeb(sec, ioaddr + RTC_SECONDS);
+		writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
+	}
+	if (!(readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG))
+		dev_warn(&pdev->dev, "voltage-low detected.\n");
+
+	pdata->last_jiffies = jiffies;
+	platform_set_drvdata(pdev, pdata);
+
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
+	rtc->ops = &ds1742_rtc_ops;
+
+	ret = devm_rtc_register_device(rtc);
+	if (ret)
+		return ret;
+
+	devm_rtc_nvmem_register(rtc, &nvmem_cfg);
+
+	return 0;
+}
+
+static const struct of_device_id __maybe_unused ds1742_rtc_of_match[] = {
+	{ .compatible = "maxim,ds1742", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ds1742_rtc_of_match);
+
+static struct platform_driver ds1742_rtc_driver = {
+	.probe		= ds1742_rtc_probe,
+	.driver		= {
+		.name	= "rtc-ds1742",
+		.of_match_table = of_match_ptr(ds1742_rtc_of_match),
+	},
+};
+
+module_platform_driver(ds1742_rtc_driver);
+
+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
+MODULE_DESCRIPTION("Dallas DS1742 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc-ds1742");