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, 333 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-da9052.c b/drivers/rtc/rtc-da9052.c
new file mode 100644
index 000000000..9ca99bd35
--- /dev/null
+++ b/drivers/rtc/rtc-da9052.c
@@ -0,0 +1,333 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Real time clock driver for DA9052
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+#define rtc_err(rtc, fmt, ...) \
+		dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
+
+#define DA9052_GET_TIME_RETRIES 5
+
+struct da9052_rtc {
+	struct rtc_device *rtc;
+	struct da9052 *da9052;
+};
+
+static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
+{
+	int ret;
+	if (enable) {
+		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
+				DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
+				DA9052_ALARM_Y_ALARM_ON);
+		if (ret != 0)
+			rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
+	} else {
+		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
+			DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
+		if (ret != 0)
+			rtc_err(rtc, "Write error: %d\n", ret);
+	}
+	return ret;
+}
+
+static irqreturn_t da9052_rtc_irq(int irq, void *data)
+{
+	struct da9052_rtc *rtc = data;
+
+	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
+
+	return IRQ_HANDLED;
+}
+
+static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
+{
+	int ret;
+	uint8_t v[2][5];
+	int idx = 1;
+	int timeout = DA9052_GET_TIME_RETRIES;
+
+	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]);
+	if (ret) {
+		rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
+		return ret;
+	}
+
+	do {
+		ret = da9052_group_read(rtc->da9052,
+					DA9052_ALARM_MI_REG, 5, &v[idx][0]);
+		if (ret) {
+			rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
+			return ret;
+		}
+
+		if (memcmp(&v[0][0], &v[1][0], 5) == 0) {
+			rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100;
+			rtc_tm->tm_mon  = (v[0][3] & DA9052_RTC_MONTH) - 1;
+			rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY;
+			rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR;
+			rtc_tm->tm_min  = v[0][0] & DA9052_RTC_MIN;
+			rtc_tm->tm_sec = 0;
+
+			ret = rtc_valid_tm(rtc_tm);
+			return ret;
+		}
+
+		idx = (1-idx);
+		msleep(20);
+
+	} while (timeout--);
+
+	rtc_err(rtc, "Timed out reading alarm time\n");
+
+	return -EIO;
+}
+
+static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
+{
+	struct da9052 *da9052 = rtc->da9052;
+	unsigned long alm_time;
+	int ret;
+	uint8_t v[3];
+
+	alm_time = rtc_tm_to_time64(rtc_tm);
+
+	if (rtc_tm->tm_sec > 0) {
+		alm_time += 60 - rtc_tm->tm_sec;
+		rtc_time64_to_tm(alm_time, rtc_tm);
+	}
+	BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */
+
+	rtc_tm->tm_year -= 100;
+	rtc_tm->tm_mon += 1;
+
+	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
+				DA9052_RTC_MIN, rtc_tm->tm_min);
+	if (ret != 0) {
+		rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
+		return ret;
+	}
+
+	v[0] = rtc_tm->tm_hour;
+	v[1] = rtc_tm->tm_mday;
+	v[2] = rtc_tm->tm_mon;
+
+	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
+	if (ret < 0)
+		return ret;
+
+	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
+				DA9052_RTC_YEAR, rtc_tm->tm_year);
+	if (ret != 0)
+		rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
+
+	return ret;
+}
+
+static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
+{
+	int ret;
+
+	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
+	if (ret < 0) {
+		rtc_err(rtc, "Failed to read ALM: %d\n", ret);
+		return ret;
+	}
+
+	return !!(ret&DA9052_ALARM_Y_ALARM_ON);
+}
+
+static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
+{
+	struct da9052_rtc *rtc = dev_get_drvdata(dev);
+	int ret;
+	uint8_t v[2][6];
+	int idx = 1;
+	int timeout = DA9052_GET_TIME_RETRIES;
+
+	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]);
+	if (ret) {
+		rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
+		return ret;
+	}
+
+	do {
+		ret = da9052_group_read(rtc->da9052,
+					DA9052_COUNT_S_REG, 6, &v[idx][0]);
+		if (ret) {
+			rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
+			return ret;
+		}
+
+		if (memcmp(&v[0][0], &v[1][0], 6) == 0) {
+			rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100;
+			rtc_tm->tm_mon  = (v[0][4] & DA9052_RTC_MONTH) - 1;
+			rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY;
+			rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR;
+			rtc_tm->tm_min  = v[0][1] & DA9052_RTC_MIN;
+			rtc_tm->tm_sec  = v[0][0] & DA9052_RTC_SEC;
+
+			return 0;
+		}
+
+		idx = (1-idx);
+		msleep(20);
+
+	} while (timeout--);
+
+	rtc_err(rtc, "Timed out reading time\n");
+
+	return -EIO;
+}
+
+static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct da9052_rtc *rtc;
+	uint8_t v[6];
+	int ret;
+
+	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
+	if ((tm->tm_year < 100) || (tm->tm_year > 163))
+		return -EINVAL;
+
+	rtc = dev_get_drvdata(dev);
+
+	v[0] = tm->tm_sec;
+	v[1] = tm->tm_min;
+	v[2] = tm->tm_hour;
+	v[3] = tm->tm_mday;
+	v[4] = tm->tm_mon + 1;
+	v[5] = tm->tm_year - 100;
+
+	ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
+	if (ret < 0)
+		rtc_err(rtc, "failed to set RTC time: %d\n", ret);
+	return ret;
+}
+
+static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	int ret;
+	struct rtc_time *tm = &alrm->time;
+	struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+	ret = da9052_read_alarm(rtc, tm);
+	if (ret < 0) {
+		rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
+		return ret;
+	}
+
+	alrm->enabled = da9052_rtc_get_alarm_status(rtc);
+	return 0;
+}
+
+static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	int ret;
+	struct rtc_time *tm = &alrm->time;
+	struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
+	if ((tm->tm_year < 100) || (tm->tm_year > 163))
+		return -EINVAL;
+
+	ret = da9052_rtc_enable_alarm(rtc, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = da9052_set_alarm(rtc, tm);
+	if (ret < 0)
+		return ret;
+
+	ret = da9052_rtc_enable_alarm(rtc, 1);
+	return ret;
+}
+
+static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct da9052_rtc *rtc = dev_get_drvdata(dev);
+
+	return da9052_rtc_enable_alarm(rtc, enabled);
+}
+
+static const struct rtc_class_ops da9052_rtc_ops = {
+	.read_time	= da9052_rtc_read_time,
+	.set_time	= da9052_rtc_set_time,
+	.read_alarm	= da9052_rtc_read_alarm,
+	.set_alarm	= da9052_rtc_set_alarm,
+	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
+};
+
+static int da9052_rtc_probe(struct platform_device *pdev)
+{
+	struct da9052_rtc *rtc;
+	int ret;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
+	platform_set_drvdata(pdev, rtc);
+
+	ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
+	if (ret < 0) {
+		rtc_err(rtc,
+			"Failed to setup RTC battery charging: %d\n", ret);
+		return ret;
+	}
+
+	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
+				DA9052_ALARM_Y_TICK_ON, 0);
+	if (ret != 0)
+		rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
+
+	device_init_wakeup(&pdev->dev, true);
+	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc->rtc))
+		return PTR_ERR(rtc->rtc);
+
+	rtc->rtc->ops = &da9052_rtc_ops;
+	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->rtc->range_max = RTC_TIMESTAMP_END_2063;
+
+	ret = devm_rtc_register_device(rtc->rtc);
+	if (ret)
+		return ret;
+
+	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
+				da9052_rtc_irq, rtc);
+	if (ret != 0) {
+		rtc_err(rtc, "irq registration failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver da9052_rtc_driver = {
+	.probe	= da9052_rtc_probe,
+	.driver = {
+		.name	= "da9052-rtc",
+	},
+};
+
+module_platform_driver(da9052_rtc_driver);
+
+MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
+MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-rtc");