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, 193 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-m48t35.c b/drivers/rtc/rtc-m48t35.c
new file mode 100644
index 000000000..92f19bf99
--- /dev/null
+++ b/drivers/rtc/rtc-m48t35.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for the SGS-Thomson M48T35 Timekeeper RAM chip
+ *
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Written by Ulf Carlsson (ulfc@engr.sgi.com)
+ *
+ * Copyright (C) 2008 Thomas Bogendoerfer
+ *
+ * Based on code written by Paul Gortmaker.
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+#include <linux/io.h>
+#include <linux/err.h>
+
+struct m48t35_rtc {
+	u8	pad[0x7ff8];    /* starts at 0x7ff8 */
+#ifdef CONFIG_SGI_IP27
+	u8	hour;
+	u8	min;
+	u8	sec;
+	u8	control;
+	u8	year;
+	u8	month;
+	u8	date;
+	u8	day;
+#else
+	u8	control;
+	u8	sec;
+	u8	min;
+	u8	hour;
+	u8	day;
+	u8	date;
+	u8	month;
+	u8	year;
+#endif
+};
+
+#define M48T35_RTC_SET		0x80
+#define M48T35_RTC_READ		0x40
+
+struct m48t35_priv {
+	struct rtc_device *rtc;
+	struct m48t35_rtc __iomem *reg;
+	size_t size;
+	unsigned long baseaddr;
+	spinlock_t lock;
+};
+
+static int m48t35_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct m48t35_priv *priv = dev_get_drvdata(dev);
+	u8 control;
+
+	/*
+	 * Only the values that we read from the RTC are set. We leave
+	 * tm_wday, tm_yday and tm_isdst untouched. Even though the
+	 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
+	 * by the RTC when initially set to a non-zero value.
+	 */
+	spin_lock_irq(&priv->lock);
+	control = readb(&priv->reg->control);
+	writeb(control | M48T35_RTC_READ, &priv->reg->control);
+	tm->tm_sec = readb(&priv->reg->sec);
+	tm->tm_min = readb(&priv->reg->min);
+	tm->tm_hour = readb(&priv->reg->hour);
+	tm->tm_mday = readb(&priv->reg->date);
+	tm->tm_mon = readb(&priv->reg->month);
+	tm->tm_year = readb(&priv->reg->year);
+	writeb(control, &priv->reg->control);
+	spin_unlock_irq(&priv->lock);
+
+	tm->tm_sec = bcd2bin(tm->tm_sec);
+	tm->tm_min = bcd2bin(tm->tm_min);
+	tm->tm_hour = bcd2bin(tm->tm_hour);
+	tm->tm_mday = bcd2bin(tm->tm_mday);
+	tm->tm_mon = bcd2bin(tm->tm_mon);
+	tm->tm_year = bcd2bin(tm->tm_year);
+
+	/*
+	 * Account for differences between how the RTC uses the values
+	 * and how they are defined in a struct rtc_time;
+	 */
+	tm->tm_year += 70;
+	if (tm->tm_year <= 69)
+		tm->tm_year += 100;
+
+	tm->tm_mon--;
+	return 0;
+}
+
+static int m48t35_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct m48t35_priv *priv = dev_get_drvdata(dev);
+	unsigned char mon, day, hrs, min, sec;
+	unsigned int yrs;
+	u8 control;
+
+	yrs = tm->tm_year + 1900;
+	mon = tm->tm_mon + 1;   /* tm_mon starts at zero */
+	day = tm->tm_mday;
+	hrs = tm->tm_hour;
+	min = tm->tm_min;
+	sec = tm->tm_sec;
+
+	if (yrs < 1970)
+		return -EINVAL;
+
+	yrs -= 1970;
+	if (yrs > 255)    /* They are unsigned */
+		return -EINVAL;
+
+	if (yrs > 169)
+		return -EINVAL;
+
+	if (yrs >= 100)
+		yrs -= 100;
+
+	sec = bin2bcd(sec);
+	min = bin2bcd(min);
+	hrs = bin2bcd(hrs);
+	day = bin2bcd(day);
+	mon = bin2bcd(mon);
+	yrs = bin2bcd(yrs);
+
+	spin_lock_irq(&priv->lock);
+	control = readb(&priv->reg->control);
+	writeb(control | M48T35_RTC_SET, &priv->reg->control);
+	writeb(yrs, &priv->reg->year);
+	writeb(mon, &priv->reg->month);
+	writeb(day, &priv->reg->date);
+	writeb(hrs, &priv->reg->hour);
+	writeb(min, &priv->reg->min);
+	writeb(sec, &priv->reg->sec);
+	writeb(control, &priv->reg->control);
+	spin_unlock_irq(&priv->lock);
+	return 0;
+}
+
+static const struct rtc_class_ops m48t35_ops = {
+	.read_time	= m48t35_read_time,
+	.set_time	= m48t35_set_time,
+};
+
+static int m48t35_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct m48t35_priv *priv;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct m48t35_priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->size = resource_size(res);
+	if (!devm_request_mem_region(&pdev->dev, res->start, priv->size,
+				     pdev->name))
+		return -EBUSY;
+
+	priv->baseaddr = res->start;
+	priv->reg = devm_ioremap(&pdev->dev, priv->baseaddr, priv->size);
+	if (!priv->reg)
+		return -ENOMEM;
+
+	spin_lock_init(&priv->lock);
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->rtc = devm_rtc_device_register(&pdev->dev, "m48t35",
+				  &m48t35_ops, THIS_MODULE);
+	return PTR_ERR_OR_ZERO(priv->rtc);
+}
+
+static struct platform_driver m48t35_platform_driver = {
+	.driver		= {
+		.name	= "rtc-m48t35",
+	},
+	.probe		= m48t35_probe,
+};
+
+module_platform_driver(m48t35_platform_driver);
+
+MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
+MODULE_DESCRIPTION("M48T35 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc-m48t35");