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, 342 insertions, 0 deletions

diff --git a/drivers/input/joystick/n64joy.c b/drivers/input/joystick/n64joy.c
new file mode 100644
index 000000000..43a02bb99
--- /dev/null
+++ b/drivers/input/joystick/n64joy.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for the four N64 controllers.
+ *
+ * Copyright (c) 2021 Lauri Kasanen
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/limits.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
+MODULE_DESCRIPTION("Driver for N64 controllers");
+MODULE_LICENSE("GPL");
+
+#define PIF_RAM 0x1fc007c0
+
+#define SI_DRAM_REG 0
+#define SI_READ_REG 1
+#define SI_WRITE_REG 4
+#define SI_STATUS_REG 6
+
+#define SI_STATUS_DMA_BUSY  BIT(0)
+#define SI_STATUS_IO_BUSY   BIT(1)
+
+#define N64_CONTROLLER_ID 0x0500
+
+#define MAX_CONTROLLERS 4
+
+static const char *n64joy_phys[MAX_CONTROLLERS] = {
+	"n64joy/port0",
+	"n64joy/port1",
+	"n64joy/port2",
+	"n64joy/port3",
+};
+
+struct n64joy_priv {
+	u64 si_buf[8] ____cacheline_aligned;
+	struct timer_list timer;
+	struct mutex n64joy_mutex;
+	struct input_dev *n64joy_dev[MAX_CONTROLLERS];
+	u32 __iomem *reg_base;
+	u8 n64joy_opened;
+};
+
+struct joydata {
+	unsigned int: 16; /* unused */
+	unsigned int err: 2;
+	unsigned int: 14; /* unused */
+
+	union {
+		u32 data;
+
+		struct {
+			unsigned int a: 1;
+			unsigned int b: 1;
+			unsigned int z: 1;
+			unsigned int start: 1;
+			unsigned int up: 1;
+			unsigned int down: 1;
+			unsigned int left: 1;
+			unsigned int right: 1;
+			unsigned int: 2; /* unused */
+			unsigned int l: 1;
+			unsigned int r: 1;
+			unsigned int c_up: 1;
+			unsigned int c_down: 1;
+			unsigned int c_left: 1;
+			unsigned int c_right: 1;
+			signed int x: 8;
+			signed int y: 8;
+		};
+	};
+};
+
+static void n64joy_write_reg(u32 __iomem *reg_base, const u8 reg, const u32 value)
+{
+	writel(value, reg_base + reg);
+}
+
+static u32 n64joy_read_reg(u32 __iomem *reg_base, const u8 reg)
+{
+	return readl(reg_base + reg);
+}
+
+static void n64joy_wait_si_dma(u32 __iomem *reg_base)
+{
+	while (n64joy_read_reg(reg_base, SI_STATUS_REG) &
+	       (SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY))
+		cpu_relax();
+}
+
+static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8])
+{
+	unsigned long flags;
+
+	dma_cache_wback_inv((unsigned long) in, 8 * 8);
+	dma_cache_inv((unsigned long) priv->si_buf, 8 * 8);
+
+	local_irq_save(flags);
+
+	n64joy_wait_si_dma(priv->reg_base);
+
+	barrier();
+	n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(in));
+	barrier();
+	n64joy_write_reg(priv->reg_base, SI_WRITE_REG, PIF_RAM);
+	barrier();
+
+	n64joy_wait_si_dma(priv->reg_base);
+
+	barrier();
+	n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(priv->si_buf));
+	barrier();
+	n64joy_write_reg(priv->reg_base, SI_READ_REG, PIF_RAM);
+	barrier();
+
+	n64joy_wait_si_dma(priv->reg_base);
+
+	local_irq_restore(flags);
+}
+
+static const u64 polldata[] ____cacheline_aligned = {
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xfe00000000000000,
+	0,
+	0,
+	1
+};
+
+static void n64joy_poll(struct timer_list *t)
+{
+	const struct joydata *data;
+	struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer);
+	struct input_dev *dev;
+	u32 i;
+
+	n64joy_exec_pif(priv, polldata);
+
+	data = (struct joydata *) priv->si_buf;
+
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!priv->n64joy_dev[i])
+			continue;
+
+		dev = priv->n64joy_dev[i];
+
+		/* d-pad */
+		input_report_key(dev, BTN_DPAD_UP, data[i].up);
+		input_report_key(dev, BTN_DPAD_DOWN, data[i].down);
+		input_report_key(dev, BTN_DPAD_LEFT, data[i].left);
+		input_report_key(dev, BTN_DPAD_RIGHT, data[i].right);
+
+		/* c buttons */
+		input_report_key(dev, BTN_FORWARD, data[i].c_up);
+		input_report_key(dev, BTN_BACK, data[i].c_down);
+		input_report_key(dev, BTN_LEFT, data[i].c_left);
+		input_report_key(dev, BTN_RIGHT, data[i].c_right);
+
+		/* matching buttons */
+		input_report_key(dev, BTN_START, data[i].start);
+		input_report_key(dev, BTN_Z, data[i].z);
+
+		/* remaining ones: a, b, l, r */
+		input_report_key(dev, BTN_0, data[i].a);
+		input_report_key(dev, BTN_1, data[i].b);
+		input_report_key(dev, BTN_2, data[i].l);
+		input_report_key(dev, BTN_3, data[i].r);
+
+		input_report_abs(dev, ABS_X, data[i].x);
+		input_report_abs(dev, ABS_Y, data[i].y);
+
+		input_sync(dev);
+	}
+
+	mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
+}
+
+static int n64joy_open(struct input_dev *dev)
+{
+	struct n64joy_priv *priv = input_get_drvdata(dev);
+
+	scoped_guard(mutex_intr, &priv->n64joy_mutex) {
+		if (!priv->n64joy_opened) {
+			/*
+			 * We could use the vblank irq, but it's not important
+			 * if the poll point slightly changes.
+			 */
+			timer_setup(&priv->timer, n64joy_poll, 0);
+			mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
+		}
+
+		priv->n64joy_opened++;
+		return 0;
+	}
+
+	return -EINTR;
+}
+
+static void n64joy_close(struct input_dev *dev)
+{
+	struct n64joy_priv *priv = input_get_drvdata(dev);
+
+	guard(mutex)(&priv->n64joy_mutex);
+
+	if (!--priv->n64joy_opened)
+		timer_delete_sync(&priv->timer);
+}
+
+static const u64 __initconst scandata[] ____cacheline_aligned = {
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xfe00000000000000,
+	0,
+	0,
+	1
+};
+
+/*
+ * The target device is embedded and RAM-constrained. We save RAM
+ * by initializing in __init code that gets dropped late in boot.
+ * For the same reason there is no module or unloading support.
+ */
+static int __init n64joy_probe(struct platform_device *pdev)
+{
+	const struct joydata *data;
+	struct n64joy_priv *priv;
+	struct input_dev *dev;
+	int err = 0;
+	u32 i, j, found = 0;
+
+	priv = kzalloc_obj(*priv);
+	if (!priv)
+		return -ENOMEM;
+	mutex_init(&priv->n64joy_mutex);
+
+	priv->reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->reg_base)) {
+		err = PTR_ERR(priv->reg_base);
+		goto fail;
+	}
+
+	/* The controllers are not hotpluggable, so we can scan in init */
+	n64joy_exec_pif(priv, scandata);
+
+	data = (struct joydata *) priv->si_buf;
+
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) {
+			found++;
+
+			dev = priv->n64joy_dev[i] = input_allocate_device();
+			if (!priv->n64joy_dev[i]) {
+				err = -ENOMEM;
+				goto fail;
+			}
+
+			input_set_drvdata(dev, priv);
+
+			dev->name = "N64 controller";
+			dev->phys = n64joy_phys[i];
+			dev->id.bustype = BUS_HOST;
+			dev->id.vendor = 0;
+			dev->id.product = data[i].data >> 16;
+			dev->id.version = 0;
+			dev->dev.parent = &pdev->dev;
+
+			dev->open = n64joy_open;
+			dev->close = n64joy_close;
+
+			/* d-pad */
+			input_set_capability(dev, EV_KEY, BTN_DPAD_UP);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT);
+			/* c buttons */
+			input_set_capability(dev, EV_KEY, BTN_LEFT);
+			input_set_capability(dev, EV_KEY, BTN_RIGHT);
+			input_set_capability(dev, EV_KEY, BTN_FORWARD);
+			input_set_capability(dev, EV_KEY, BTN_BACK);
+			/* matching buttons */
+			input_set_capability(dev, EV_KEY, BTN_START);
+			input_set_capability(dev, EV_KEY, BTN_Z);
+			/* remaining ones: a, b, l, r */
+			input_set_capability(dev, EV_KEY, BTN_0);
+			input_set_capability(dev, EV_KEY, BTN_1);
+			input_set_capability(dev, EV_KEY, BTN_2);
+			input_set_capability(dev, EV_KEY, BTN_3);
+
+			for (j = 0; j < 2; j++)
+				input_set_abs_params(dev, ABS_X + j,
+						     S8_MIN, S8_MAX, 0, 0);
+
+			err = input_register_device(dev);
+			if (err) {
+				input_free_device(dev);
+				goto fail;
+			}
+		}
+	}
+
+	pr_info("%u controller(s) connected\n", found);
+
+	if (!found)
+		return -ENODEV;
+
+	return 0;
+fail:
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!priv->n64joy_dev[i])
+			continue;
+		input_unregister_device(priv->n64joy_dev[i]);
+	}
+	return err;
+}
+
+static struct platform_driver n64joy_driver = {
+	.driver = {
+		.name = "n64joy",
+	},
+};
+
+static int __init n64joy_init(void)
+{
+	return platform_driver_probe(&n64joy_driver, n64joy_probe);
+}
+
+module_init(n64joy_init);