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, 384 insertions, 0 deletions

diff --git a/drivers/input/serio/sa1111ps2.c b/drivers/input/serio/sa1111ps2.c
new file mode 100644
index 000000000..e3a463c15
--- /dev/null
+++ b/drivers/input/serio/sa1111ps2.c
@@ -0,0 +1,384 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/input/serio/sa1111ps2.c
+ *
+ *  Copyright (C) 2002 Russell King
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include <asm/io.h>
+
+#include <asm/hardware/sa1111.h>
+
+#define PS2CR		0x0000
+#define PS2STAT		0x0004
+#define PS2DATA		0x0008
+#define PS2CLKDIV	0x000c
+#define PS2PRECNT	0x0010
+
+#define PS2CR_ENA	0x08
+#define PS2CR_FKD	0x02
+#define PS2CR_FKC	0x01
+
+#define PS2STAT_STP	0x0100
+#define PS2STAT_TXE	0x0080
+#define PS2STAT_TXB	0x0040
+#define PS2STAT_RXF	0x0020
+#define PS2STAT_RXB	0x0010
+#define PS2STAT_ENA	0x0008
+#define PS2STAT_RXP	0x0004
+#define PS2STAT_KBD	0x0002
+#define PS2STAT_KBC	0x0001
+
+struct ps2if {
+	struct serio		*io;
+	struct sa1111_dev	*dev;
+	void __iomem		*base;
+	int			rx_irq;
+	int			tx_irq;
+	unsigned int		open;
+	spinlock_t		lock;
+	unsigned int		head;
+	unsigned int		tail;
+	unsigned char		buf[4];
+};
+
+/*
+ * Read all bytes waiting in the PS2 port.  There should be
+ * at the most one, but we loop for safety.  If there was a
+ * framing error, we have to manually clear the status.
+ */
+static irqreturn_t ps2_rxint(int irq, void *dev_id)
+{
+	struct ps2if *ps2if = dev_id;
+	unsigned int scancode, flag, status;
+
+	status = readl_relaxed(ps2if->base + PS2STAT);
+	while (status & PS2STAT_RXF) {
+		if (status & PS2STAT_STP)
+			writel_relaxed(PS2STAT_STP, ps2if->base + PS2STAT);
+
+		flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
+		       (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
+
+		scancode = readl_relaxed(ps2if->base + PS2DATA) & 0xff;
+
+		if (hweight8(scancode) & 1)
+			flag ^= SERIO_PARITY;
+
+		serio_interrupt(ps2if->io, scancode, flag);
+
+		status = readl_relaxed(ps2if->base + PS2STAT);
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * Completion of ps2 write
+ */
+static irqreturn_t ps2_txint(int irq, void *dev_id)
+{
+	struct ps2if *ps2if = dev_id;
+	unsigned int status;
+
+	guard(spinlock)(&ps2if->lock);
+
+	status = readl_relaxed(ps2if->base + PS2STAT);
+	if (ps2if->head == ps2if->tail) {
+		disable_irq_nosync(irq);
+		/* done */
+	} else if (status & PS2STAT_TXE) {
+		writel_relaxed(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
+		ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Write a byte to the PS2 port.  We have to wait for the
+ * port to indicate that the transmitter is empty.
+ */
+static int ps2_write(struct serio *io, unsigned char val)
+{
+	struct ps2if *ps2if = io->port_data;
+	unsigned int head;
+
+	guard(spinlock_irqsave)(&ps2if->lock);
+
+	/*
+	 * If the TX register is empty, we can go straight out.
+	 */
+	if (readl_relaxed(ps2if->base + PS2STAT) & PS2STAT_TXE) {
+		writel_relaxed(val, ps2if->base + PS2DATA);
+	} else {
+		if (ps2if->head == ps2if->tail)
+			enable_irq(ps2if->tx_irq);
+		head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
+		if (head != ps2if->tail) {
+			ps2if->buf[ps2if->head] = val;
+			ps2if->head = head;
+		}
+	}
+
+	return 0;
+}
+
+static int ps2_open(struct serio *io)
+{
+	struct ps2if *ps2if = io->port_data;
+	int ret;
+
+	ret = sa1111_enable_device(ps2if->dev);
+	if (ret)
+		return ret;
+
+	ret = request_irq(ps2if->rx_irq, ps2_rxint, 0,
+			  SA1111_DRIVER_NAME(ps2if->dev), ps2if);
+	if (ret) {
+		printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
+			ps2if->rx_irq, ret);
+		sa1111_disable_device(ps2if->dev);
+		return ret;
+	}
+
+	ret = request_irq(ps2if->tx_irq, ps2_txint, 0,
+			  SA1111_DRIVER_NAME(ps2if->dev), ps2if);
+	if (ret) {
+		printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
+			ps2if->tx_irq, ret);
+		free_irq(ps2if->rx_irq, ps2if);
+		sa1111_disable_device(ps2if->dev);
+		return ret;
+	}
+
+	ps2if->open = 1;
+
+	enable_irq_wake(ps2if->rx_irq);
+
+	writel_relaxed(PS2CR_ENA, ps2if->base + PS2CR);
+	return 0;
+}
+
+static void ps2_close(struct serio *io)
+{
+	struct ps2if *ps2if = io->port_data;
+
+	writel_relaxed(0, ps2if->base + PS2CR);
+
+	disable_irq_wake(ps2if->rx_irq);
+
+	ps2if->open = 0;
+
+	free_irq(ps2if->tx_irq, ps2if);
+	free_irq(ps2if->rx_irq, ps2if);
+
+	sa1111_disable_device(ps2if->dev);
+}
+
+/*
+ * Clear the input buffer.
+ */
+static void ps2_clear_input(struct ps2if *ps2if)
+{
+	int maxread = 100;
+
+	while (maxread--) {
+		if ((readl_relaxed(ps2if->base + PS2DATA) & 0xff) == 0xff)
+			break;
+	}
+}
+
+static unsigned int ps2_test_one(struct ps2if *ps2if,
+					   unsigned int mask)
+{
+	unsigned int val;
+
+	writel_relaxed(PS2CR_ENA | mask, ps2if->base + PS2CR);
+
+	udelay(10);
+
+	val = readl_relaxed(ps2if->base + PS2STAT);
+	return val & (PS2STAT_KBC | PS2STAT_KBD);
+}
+
+/*
+ * Test the keyboard interface.  We basically check to make sure that
+ * we can drive each line to the keyboard independently of each other.
+ */
+static int ps2_test(struct ps2if *ps2if)
+{
+	unsigned int stat;
+	int ret = 0;
+
+	stat = ps2_test_one(ps2if, PS2CR_FKC);
+	if (stat != PS2STAT_KBD) {
+		printk("PS/2 interface test failed[1]: %02x\n", stat);
+		ret = -ENODEV;
+	}
+
+	stat = ps2_test_one(ps2if, 0);
+	if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
+		printk("PS/2 interface test failed[2]: %02x\n", stat);
+		ret = -ENODEV;
+	}
+
+	stat = ps2_test_one(ps2if, PS2CR_FKD);
+	if (stat != PS2STAT_KBC) {
+		printk("PS/2 interface test failed[3]: %02x\n", stat);
+		ret = -ENODEV;
+	}
+
+	writel_relaxed(0, ps2if->base + PS2CR);
+
+	return ret;
+}
+
+/*
+ * Add one device to this driver.
+ */
+static int ps2_probe(struct sa1111_dev *dev)
+{
+	struct ps2if *ps2if;
+	struct serio *serio;
+	int ret;
+
+	ps2if = kzalloc_obj(*ps2if);
+	serio = kzalloc_obj(*serio);
+	if (!ps2if || !serio) {
+		ret = -ENOMEM;
+		goto free;
+	}
+
+	serio->id.type		= SERIO_8042;
+	serio->write		= ps2_write;
+	serio->open		= ps2_open;
+	serio->close		= ps2_close;
+	strscpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
+	strscpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
+	serio->port_data	= ps2if;
+	serio->dev.parent	= &dev->dev;
+	ps2if->io		= serio;
+	ps2if->dev		= dev;
+	sa1111_set_drvdata(dev, ps2if);
+
+	spin_lock_init(&ps2if->lock);
+
+	ps2if->rx_irq = sa1111_get_irq(dev, 0);
+	if (ps2if->rx_irq <= 0) {
+		ret = ps2if->rx_irq ? : -ENXIO;
+		goto free;
+	}
+
+	ps2if->tx_irq = sa1111_get_irq(dev, 1);
+	if (ps2if->tx_irq <= 0) {
+		ret = ps2if->tx_irq ? : -ENXIO;
+		goto free;
+	}
+
+	/*
+	 * Request the physical region for this PS2 port.
+	 */
+	if (!request_mem_region(dev->res.start,
+				dev->res.end - dev->res.start + 1,
+				SA1111_DRIVER_NAME(dev))) {
+		ret = -EBUSY;
+		goto free;
+	}
+
+	/*
+	 * Our parent device has already mapped the region.
+	 */
+	ps2if->base = dev->mapbase;
+
+	sa1111_enable_device(ps2if->dev);
+
+	/* Incoming clock is 8MHz */
+	writel_relaxed(0, ps2if->base + PS2CLKDIV);
+	writel_relaxed(127, ps2if->base + PS2PRECNT);
+
+	/*
+	 * Flush any pending input.
+	 */
+	ps2_clear_input(ps2if);
+
+	/*
+	 * Test the keyboard interface.
+	 */
+	ret = ps2_test(ps2if);
+	if (ret)
+		goto out;
+
+	/*
+	 * Flush any pending input.
+	 */
+	ps2_clear_input(ps2if);
+
+	sa1111_disable_device(ps2if->dev);
+	serio_register_port(ps2if->io);
+	return 0;
+
+ out:
+	sa1111_disable_device(ps2if->dev);
+	release_mem_region(dev->res.start, resource_size(&dev->res));
+ free:
+	sa1111_set_drvdata(dev, NULL);
+	kfree(ps2if);
+	kfree(serio);
+	return ret;
+}
+
+/*
+ * Remove one device from this driver.
+ */
+static void ps2_remove(struct sa1111_dev *dev)
+{
+	struct ps2if *ps2if = sa1111_get_drvdata(dev);
+
+	serio_unregister_port(ps2if->io);
+	release_mem_region(dev->res.start, resource_size(&dev->res));
+	sa1111_set_drvdata(dev, NULL);
+
+	kfree(ps2if);
+}
+
+/*
+ * Our device driver structure
+ */
+static struct sa1111_driver ps2_driver = {
+	.drv = {
+		.name	= "sa1111-ps2",
+		.owner	= THIS_MODULE,
+	},
+	.devid		= SA1111_DEVID_PS2,
+	.probe		= ps2_probe,
+	.remove		= ps2_remove,
+};
+
+static int __init ps2_init(void)
+{
+	return sa1111_driver_register(&ps2_driver);
+}
+
+static void __exit ps2_exit(void)
+{
+	sa1111_driver_unregister(&ps2_driver);
+}
+
+module_init(ps2_init);
+module_exit(ps2_exit);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("SA1111 PS2 controller driver");
+MODULE_LICENSE("GPL");