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, 657 insertions, 0 deletions

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
new file mode 100644
index 000000000..8b3cfa672
--- /dev/null
+++ b/drivers/clocksource/sh_tmu.c
@@ -0,0 +1,657 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SuperH Timer Support - TMU
+ *
+ *  Copyright (C) 2009 Magnus Damm
+ */
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+#include <linux/sh_timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#ifdef CONFIG_SUPERH
+#include <asm/platform_early.h>
+#endif
+
+enum sh_tmu_model {
+	SH_TMU,
+	SH_TMU_SH3,
+};
+
+struct sh_tmu_device;
+
+struct sh_tmu_channel {
+	struct sh_tmu_device *tmu;
+	unsigned int index;
+
+	void __iomem *base;
+	int irq;
+
+	unsigned long periodic;
+	struct clock_event_device ced;
+	struct clocksource cs;
+	bool cs_enabled;
+	unsigned int enable_count;
+};
+
+struct sh_tmu_device {
+	struct platform_device *pdev;
+
+	void __iomem *mapbase;
+	struct clk *clk;
+	unsigned long rate;
+
+	enum sh_tmu_model model;
+
+	raw_spinlock_t lock; /* Protect the shared start/stop register */
+
+	struct sh_tmu_channel *channels;
+	unsigned int num_channels;
+
+	bool has_clockevent;
+	bool has_clocksource;
+};
+
+#define TSTR -1 /* shared register */
+#define TCOR  0 /* channel register */
+#define TCNT 1 /* channel register */
+#define TCR 2 /* channel register */
+
+#define TCR_UNF			(1 << 8)
+#define TCR_UNIE		(1 << 5)
+#define TCR_TPSC_CLK4		(0 << 0)
+#define TCR_TPSC_CLK16		(1 << 0)
+#define TCR_TPSC_CLK64		(2 << 0)
+#define TCR_TPSC_CLK256		(3 << 0)
+#define TCR_TPSC_CLK1024	(4 << 0)
+#define TCR_TPSC_MASK		(7 << 0)
+
+static inline unsigned long sh_tmu_read(struct sh_tmu_channel *ch, int reg_nr)
+{
+	unsigned long offs;
+
+	if (reg_nr == TSTR) {
+		switch (ch->tmu->model) {
+		case SH_TMU_SH3:
+			return ioread8(ch->tmu->mapbase + 2);
+		case SH_TMU:
+			return ioread8(ch->tmu->mapbase + 4);
+		}
+	}
+
+	offs = reg_nr << 2;
+
+	if (reg_nr == TCR)
+		return ioread16(ch->base + offs);
+	else
+		return ioread32(ch->base + offs);
+}
+
+static inline void sh_tmu_write(struct sh_tmu_channel *ch, int reg_nr,
+				unsigned long value)
+{
+	unsigned long offs;
+
+	if (reg_nr == TSTR) {
+		switch (ch->tmu->model) {
+		case SH_TMU_SH3:
+			return iowrite8(value, ch->tmu->mapbase + 2);
+		case SH_TMU:
+			return iowrite8(value, ch->tmu->mapbase + 4);
+		}
+	}
+
+	offs = reg_nr << 2;
+
+	if (reg_nr == TCR)
+		iowrite16(value, ch->base + offs);
+	else
+		iowrite32(value, ch->base + offs);
+}
+
+static void sh_tmu_start_stop_ch(struct sh_tmu_channel *ch, int start)
+{
+	unsigned long flags, value;
+
+	/* start stop register shared by multiple timer channels */
+	raw_spin_lock_irqsave(&ch->tmu->lock, flags);
+	value = sh_tmu_read(ch, TSTR);
+
+	if (start)
+		value |= 1 << ch->index;
+	else
+		value &= ~(1 << ch->index);
+
+	sh_tmu_write(ch, TSTR, value);
+	raw_spin_unlock_irqrestore(&ch->tmu->lock, flags);
+}
+
+static int __sh_tmu_enable(struct sh_tmu_channel *ch)
+{
+	/* make sure channel is disabled */
+	sh_tmu_start_stop_ch(ch, 0);
+
+	/* maximum timeout */
+	sh_tmu_write(ch, TCOR, 0xffffffff);
+	sh_tmu_write(ch, TCNT, 0xffffffff);
+
+	/* configure channel to parent clock / 4, irq off */
+	sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
+
+	/* enable channel */
+	sh_tmu_start_stop_ch(ch, 1);
+
+	return 0;
+}
+
+static int sh_tmu_enable(struct sh_tmu_channel *ch)
+{
+	if (ch->enable_count++ > 0)
+		return 0;
+
+	dev_pm_syscore_device(&ch->tmu->pdev->dev, true);
+
+	return __sh_tmu_enable(ch);
+}
+
+static void __sh_tmu_disable(struct sh_tmu_channel *ch)
+{
+	/* disable channel */
+	sh_tmu_start_stop_ch(ch, 0);
+
+	/* disable interrupts in TMU block */
+	sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
+}
+
+static void sh_tmu_disable(struct sh_tmu_channel *ch)
+{
+	if (WARN_ON(ch->enable_count == 0))
+		return;
+
+	if (--ch->enable_count > 0)
+		return;
+
+	__sh_tmu_disable(ch);
+
+	dev_pm_syscore_device(&ch->tmu->pdev->dev, false);
+}
+
+static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta,
+			    int periodic)
+{
+	/* stop timer */
+	sh_tmu_start_stop_ch(ch, 0);
+
+	/* acknowledge interrupt */
+	sh_tmu_read(ch, TCR);
+
+	/* enable interrupt */
+	sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
+
+	/* reload delta value in case of periodic timer */
+	if (periodic)
+		sh_tmu_write(ch, TCOR, delta);
+	else
+		sh_tmu_write(ch, TCOR, 0xffffffff);
+
+	sh_tmu_write(ch, TCNT, delta);
+
+	/* start timer */
+	sh_tmu_start_stop_ch(ch, 1);
+}
+
+static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
+{
+	struct sh_tmu_channel *ch = dev_id;
+
+	/* disable or acknowledge interrupt */
+	if (clockevent_state_oneshot(&ch->ced))
+		sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
+	else
+		sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
+
+	/* notify clockevent layer */
+	ch->ced.event_handler(&ch->ced);
+	return IRQ_HANDLED;
+}
+
+static struct sh_tmu_channel *cs_to_sh_tmu(struct clocksource *cs)
+{
+	return container_of(cs, struct sh_tmu_channel, cs);
+}
+
+static u64 sh_tmu_clocksource_read(struct clocksource *cs)
+{
+	struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
+
+	return sh_tmu_read(ch, TCNT) ^ 0xffffffff;
+}
+
+static int sh_tmu_clocksource_enable(struct clocksource *cs)
+{
+	struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
+	int ret;
+
+	if (WARN_ON(ch->cs_enabled))
+		return 0;
+
+	ret = sh_tmu_enable(ch);
+	if (!ret)
+		ch->cs_enabled = true;
+
+	return ret;
+}
+
+static void sh_tmu_clocksource_disable(struct clocksource *cs)
+{
+	struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
+
+	if (WARN_ON(!ch->cs_enabled))
+		return;
+
+	sh_tmu_disable(ch);
+	ch->cs_enabled = false;
+}
+
+static void sh_tmu_clocksource_suspend(struct clocksource *cs)
+{
+	struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
+
+	if (!ch->cs_enabled)
+		return;
+
+	if (--ch->enable_count == 0) {
+		__sh_tmu_disable(ch);
+		dev_pm_genpd_suspend(&ch->tmu->pdev->dev);
+	}
+}
+
+static void sh_tmu_clocksource_resume(struct clocksource *cs)
+{
+	struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
+
+	if (!ch->cs_enabled)
+		return;
+
+	if (ch->enable_count++ == 0) {
+		dev_pm_genpd_resume(&ch->tmu->pdev->dev);
+		__sh_tmu_enable(ch);
+	}
+}
+
+static int sh_tmu_register_clocksource(struct sh_tmu_channel *ch,
+				       const char *name)
+{
+	struct clocksource *cs = &ch->cs;
+
+	cs->name = name;
+	cs->rating = 200;
+	cs->read = sh_tmu_clocksource_read;
+	cs->enable = sh_tmu_clocksource_enable;
+	cs->disable = sh_tmu_clocksource_disable;
+	cs->suspend = sh_tmu_clocksource_suspend;
+	cs->resume = sh_tmu_clocksource_resume;
+	cs->mask = CLOCKSOURCE_MASK(32);
+	cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+
+	dev_info(&ch->tmu->pdev->dev, "ch%u: used as clock source\n",
+		 ch->index);
+
+	clocksource_register_hz(cs, ch->tmu->rate);
+	return 0;
+}
+
+static struct sh_tmu_channel *ced_to_sh_tmu(struct clock_event_device *ced)
+{
+	return container_of(ced, struct sh_tmu_channel, ced);
+}
+
+static void sh_tmu_clock_event_start(struct sh_tmu_channel *ch, int periodic)
+{
+	sh_tmu_enable(ch);
+
+	if (periodic) {
+		ch->periodic = (ch->tmu->rate + HZ/2) / HZ;
+		sh_tmu_set_next(ch, ch->periodic, 1);
+	}
+}
+
+static int sh_tmu_clock_event_shutdown(struct clock_event_device *ced)
+{
+	struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
+
+	if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
+		sh_tmu_disable(ch);
+	return 0;
+}
+
+static int sh_tmu_clock_event_set_state(struct clock_event_device *ced,
+					int periodic)
+{
+	struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
+
+	/* deal with old setting first */
+	if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
+		sh_tmu_disable(ch);
+
+	dev_info(&ch->tmu->pdev->dev, "ch%u: used for %s clock events\n",
+		 ch->index, periodic ? "periodic" : "oneshot");
+	sh_tmu_clock_event_start(ch, periodic);
+	return 0;
+}
+
+static int sh_tmu_clock_event_set_oneshot(struct clock_event_device *ced)
+{
+	return sh_tmu_clock_event_set_state(ced, 0);
+}
+
+static int sh_tmu_clock_event_set_periodic(struct clock_event_device *ced)
+{
+	return sh_tmu_clock_event_set_state(ced, 1);
+}
+
+static int sh_tmu_clock_event_next(unsigned long delta,
+				   struct clock_event_device *ced)
+{
+	struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
+
+	BUG_ON(!clockevent_state_oneshot(ced));
+
+	/* program new delta value */
+	sh_tmu_set_next(ch, delta, 0);
+	return 0;
+}
+
+static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
+{
+	dev_pm_genpd_suspend(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
+}
+
+static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
+{
+	dev_pm_genpd_resume(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
+}
+
+static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch,
+				       const char *name)
+{
+	struct clock_event_device *ced = &ch->ced;
+	int ret;
+
+	ced->name = name;
+	ced->features = CLOCK_EVT_FEAT_PERIODIC;
+	ced->features |= CLOCK_EVT_FEAT_ONESHOT;
+	ced->rating = 200;
+	ced->cpumask = cpu_possible_mask;
+	ced->set_next_event = sh_tmu_clock_event_next;
+	ced->set_state_shutdown = sh_tmu_clock_event_shutdown;
+	ced->set_state_periodic = sh_tmu_clock_event_set_periodic;
+	ced->set_state_oneshot = sh_tmu_clock_event_set_oneshot;
+	ced->suspend = sh_tmu_clock_event_suspend;
+	ced->resume = sh_tmu_clock_event_resume;
+
+	dev_info(&ch->tmu->pdev->dev, "ch%u: used for clock events\n",
+		 ch->index);
+
+	clockevents_config_and_register(ced, ch->tmu->rate, 0x300, 0xffffffff);
+
+	ret = request_irq(ch->irq, sh_tmu_interrupt,
+			  IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
+			  dev_name(&ch->tmu->pdev->dev), ch);
+	if (ret) {
+		dev_err(&ch->tmu->pdev->dev, "ch%u: failed to request irq %d\n",
+			ch->index, ch->irq);
+		return;
+	}
+}
+
+static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name,
+			   bool clockevent, bool clocksource)
+{
+	if (clockevent) {
+		ch->tmu->has_clockevent = true;
+		sh_tmu_register_clockevent(ch, name);
+	} else if (clocksource) {
+		ch->tmu->has_clocksource = true;
+		sh_tmu_register_clocksource(ch, name);
+	}
+
+	return 0;
+}
+
+static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index,
+				bool clockevent, bool clocksource,
+				struct sh_tmu_device *tmu)
+{
+	/* Skip unused channels. */
+	if (!clockevent && !clocksource)
+		return 0;
+
+	ch->tmu = tmu;
+	ch->index = index;
+
+	if (tmu->model == SH_TMU_SH3)
+		ch->base = tmu->mapbase + 4 + ch->index * 12;
+	else
+		ch->base = tmu->mapbase + 8 + ch->index * 12;
+
+	ch->irq = platform_get_irq(tmu->pdev, index);
+	if (ch->irq < 0)
+		return ch->irq;
+
+	ch->cs_enabled = false;
+	ch->enable_count = 0;
+
+	return sh_tmu_register(ch, dev_name(&tmu->pdev->dev),
+			       clockevent, clocksource);
+}
+
+static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
+{
+	struct resource *res;
+
+	res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&tmu->pdev->dev, "failed to get I/O memory\n");
+		return -ENXIO;
+	}
+
+	tmu->mapbase = ioremap(res->start, resource_size(res));
+	if (tmu->mapbase == NULL)
+		return -ENXIO;
+
+	return 0;
+}
+
+static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
+{
+	struct device_node *np = tmu->pdev->dev.of_node;
+
+	tmu->model = SH_TMU;
+	tmu->num_channels = 3;
+
+	of_property_read_u32(np, "#renesas,channels", &tmu->num_channels);
+
+	if (tmu->num_channels != 2 && tmu->num_channels != 3) {
+		dev_err(&tmu->pdev->dev, "invalid number of channels %u\n",
+			tmu->num_channels);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
+{
+	unsigned int i;
+	int ret;
+
+	tmu->pdev = pdev;
+
+	raw_spin_lock_init(&tmu->lock);
+
+	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+		ret = sh_tmu_parse_dt(tmu);
+		if (ret < 0)
+			return ret;
+	} else if (pdev->dev.platform_data) {
+		const struct platform_device_id *id = pdev->id_entry;
+		struct sh_timer_config *cfg = pdev->dev.platform_data;
+
+		tmu->model = id->driver_data;
+		tmu->num_channels = hweight8(cfg->channels_mask);
+	} else {
+		dev_err(&tmu->pdev->dev, "missing platform data\n");
+		return -ENXIO;
+	}
+
+	/* Get hold of clock. */
+	tmu->clk = clk_get(&tmu->pdev->dev, "fck");
+	if (IS_ERR(tmu->clk)) {
+		dev_err(&tmu->pdev->dev, "cannot get clock\n");
+		return PTR_ERR(tmu->clk);
+	}
+
+	ret = clk_prepare(tmu->clk);
+	if (ret < 0)
+		goto err_clk_put;
+
+	/* Determine clock rate. */
+	ret = clk_enable(tmu->clk);
+	if (ret < 0)
+		goto err_clk_unprepare;
+
+	tmu->rate = clk_get_rate(tmu->clk) / 4;
+
+	/* Map the memory resource. */
+	ret = sh_tmu_map_memory(tmu);
+	if (ret < 0) {
+		dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n");
+		goto err_clk_unprepare;
+	}
+
+	/* Allocate and setup the channels. */
+	tmu->channels = kzalloc_objs(*tmu->channels, tmu->num_channels);
+	if (tmu->channels == NULL) {
+		ret = -ENOMEM;
+		goto err_unmap;
+	}
+
+	/*
+	 * Use the first channel as a clock event device and the second channel
+	 * as a clock source.
+	 */
+	for (i = 0; i < tmu->num_channels; ++i) {
+		ret = sh_tmu_channel_setup(&tmu->channels[i], i,
+					   i == 0, i == 1, tmu);
+		if (ret < 0)
+			goto err_unmap;
+	}
+
+	platform_set_drvdata(pdev, tmu);
+
+	return 0;
+
+err_unmap:
+	kfree(tmu->channels);
+	iounmap(tmu->mapbase);
+err_clk_unprepare:
+	clk_unprepare(tmu->clk);
+err_clk_put:
+	clk_put(tmu->clk);
+	return ret;
+}
+
+static int sh_tmu_probe(struct platform_device *pdev)
+{
+	struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
+	int ret;
+
+	if (!is_sh_early_platform_device(pdev)) {
+		pm_runtime_set_active(&pdev->dev);
+		pm_runtime_enable(&pdev->dev);
+	}
+
+	if (tmu) {
+		dev_info(&pdev->dev, "kept as earlytimer\n");
+		goto out;
+	}
+
+	tmu = kzalloc_obj(*tmu);
+	if (tmu == NULL)
+		return -ENOMEM;
+
+	ret = sh_tmu_setup(tmu, pdev);
+	if (ret) {
+		kfree(tmu);
+		pm_runtime_idle(&pdev->dev);
+		return ret;
+	}
+
+	if (is_sh_early_platform_device(pdev))
+		return 0;
+
+ out:
+	if (tmu->has_clockevent || tmu->has_clocksource)
+		pm_runtime_irq_safe(&pdev->dev);
+
+	return 0;
+}
+
+static const struct platform_device_id sh_tmu_id_table[] = {
+	{ .name = "sh-tmu", .driver_data = SH_TMU },
+	{ .name = "sh-tmu-sh3", .driver_data = SH_TMU_SH3 },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, sh_tmu_id_table);
+
+static const struct of_device_id sh_tmu_of_table[] __maybe_unused = {
+	{ .compatible = "renesas,tmu" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sh_tmu_of_table);
+
+static struct platform_driver sh_tmu_device_driver = {
+	.probe		= sh_tmu_probe,
+	.driver		= {
+		.name	= "sh_tmu",
+		.of_match_table = of_match_ptr(sh_tmu_of_table),
+		.suppress_bind_attrs = true,
+	},
+	.id_table	= sh_tmu_id_table,
+};
+
+static int __init sh_tmu_init(void)
+{
+	return platform_driver_register(&sh_tmu_device_driver);
+}
+
+static void __exit sh_tmu_exit(void)
+{
+	platform_driver_unregister(&sh_tmu_device_driver);
+}
+
+#ifdef CONFIG_SUPERH
+sh_early_platform_init("earlytimer", &sh_tmu_device_driver);
+#endif
+
+subsys_initcall(sh_tmu_init);
+module_exit(sh_tmu_exit);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("SuperH TMU Timer Driver");