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, 583 insertions, 0 deletions

diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
new file mode 100644
index 000000000..3a77a7e5c
--- /dev/null
+++ b/drivers/tty/serial/mux.c
@@ -0,0 +1,583 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+** mux.c:
+**	serial driver for the Mux console found in some PA-RISC servers.
+**
+**	(c) Copyright 2002 Ryan Bradetich
+**	(c) Copyright 2002 Hewlett-Packard Company
+**
+** This Driver currently only supports the console (port 0) on the MUX.
+** Additional work will be needed on this driver to enable the full
+** functionality of the MUX.
+**
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/console.h>
+#include <linux/delay.h> /* for udelay */
+#include <linux/device.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/parisc-device.h>
+
+#include <linux/sysrq.h>
+#include <linux/serial_core.h>
+
+#define MUX_OFFSET 0x800
+#define MUX_LINE_OFFSET 0x80
+
+#define MUX_FIFO_SIZE 255
+#define MUX_POLL_DELAY (30 * HZ / 1000)
+
+#define IO_DATA_REG_OFFSET 0x3c
+#define IO_DCOUNT_REG_OFFSET 0x40
+
+#define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000)
+#define MUX_STATUS(status) ((status & 0xF000) == 0x8000)
+#define MUX_BREAK(status) ((status & 0xF000) == 0x2000)
+
+#define MUX_NR 256
+static unsigned int port_cnt __read_mostly;
+struct mux_port {
+	struct uart_port port;
+	int enabled;
+};
+static struct mux_port mux_ports[MUX_NR];
+
+static struct uart_driver mux_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = "ttyB",
+	.dev_name = "ttyB",
+	.major = MUX_MAJOR,
+	.minor = 0,
+	.nr = MUX_NR,
+};
+
+static struct timer_list mux_timer;
+
+#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET)
+#define UART_GET_FIFO_CNT(p) __raw_readl((p)->membase + IO_DCOUNT_REG_OFFSET)
+
+/**
+ * get_mux_port_count - Get the number of available ports on the Mux.
+ * @dev: The parisc device.
+ *
+ * This function is used to determine the number of ports the Mux
+ * supports.  The IODC data reports the number of ports the Mux
+ * can support, but there are cases where not all the Mux ports
+ * are connected.  This function can override the IODC and
+ * return the true port count.
+ */
+static int __init get_mux_port_count(struct parisc_device *dev)
+{
+	int status;
+	u8 iodc_data[32];
+	unsigned long bytecnt;
+
+	/* If this is the built-in Mux for the K-Class (Eole CAP/MUX),
+	 * we only need to allocate resources for 1 port since the
+	 * other 7 ports are not connected.
+	 */
+	if(dev->id.hversion == 0x15)
+		return 1;
+
+	status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
+	BUG_ON(status != PDC_OK);
+
+	/* Return the number of ports specified in the iodc data. */
+	return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8;
+}
+
+/**
+ * mux_tx_empty - Check if the transmitter fifo is empty.
+ * @port: Ptr to the uart_port.
+ *
+ * This function test if the transmitter fifo for the port
+ * described by 'port' is empty.  If it is empty, this function
+ * should return TIOCSER_TEMT, otherwise return 0.
+ */
+static unsigned int mux_tx_empty(struct uart_port *port)
+{
+	return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT;
+} 
+
+/**
+ * mux_set_mctrl - Set the current state of the modem control inputs.
+ * @ports: Ptr to the uart_port.
+ * @mctrl: Modem control bits.
+ *
+ * The Serial MUX does not support CTS, DCD or DSR so this function
+ * is ignored.
+ */
+static void mux_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/**
+ * mux_get_mctrl - Returns the current state of modem control inputs.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial MUX does not support CTS, DCD or DSR so these lines are
+ * treated as permanently active.
+ */
+static unsigned int mux_get_mctrl(struct uart_port *port)
+{ 
+	return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+/**
+ * mux_stop_tx - Stop transmitting characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial MUX does not support this function.
+ */
+static void mux_stop_tx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_start_tx - Start transmitting characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_start_tx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_stop_rx - Stop receiving characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_stop_rx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_break_ctl - Control the transmitssion of a break signal.
+ * @port: Ptr to the uart_port.
+ * @break_state: Raise/Lower the break signal.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static void mux_tx_done(struct uart_port *port)
+{
+	/* FIXME js: really needs to wait? */
+	while (UART_GET_FIFO_CNT(port))
+		udelay(1);
+}
+
+/**
+ * mux_write - Write chars to the mux fifo.
+ * @port: Ptr to the uart_port.
+ *
+ * This function writes all the data from the uart buffer to
+ * the mux fifo.
+ */
+static void mux_write(struct uart_port *port)
+{
+	u8 ch;
+
+	uart_port_tx_limited(port, ch,
+		port->fifosize - UART_GET_FIFO_CNT(port),
+		true,
+		UART_PUT_CHAR(port, ch),
+		mux_tx_done(port));
+}
+
+/**
+ * mux_read - Read chars from the mux fifo.
+ * @port: Ptr to the uart_port.
+ *
+ * This reads all available data from the mux's fifo and pushes
+ * the data to the tty layer.
+ */
+static void mux_read(struct uart_port *port)
+{
+	struct tty_port *tport = &port->state->port;
+	int data;
+	__u32 start_count = port->icount.rx;
+
+	while(1) {
+		data = __raw_readl(port->membase + IO_DATA_REG_OFFSET);
+
+		if (MUX_STATUS(data))
+			continue;
+
+		if (MUX_EOFIFO(data))
+			break;
+
+		port->icount.rx++;
+
+		if (MUX_BREAK(data)) {
+			port->icount.brk++;
+			if(uart_handle_break(port))
+				continue;
+		}
+
+		if (uart_handle_sysrq_char(port, data & 0xffu))
+			continue;
+
+		tty_insert_flip_char(tport, data & 0xFF, TTY_NORMAL);
+	}
+	
+	if (start_count != port->icount.rx)
+		tty_flip_buffer_push(tport);
+}
+
+/**
+ * mux_startup - Initialize the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Grab any resources needed for this port and start the
+ * mux timer.
+ */
+static int mux_startup(struct uart_port *port)
+{
+	mux_ports[port->line].enabled = 1;
+	return 0;
+}
+
+/**
+ * mux_shutdown - Disable the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Release any resources needed for the port.
+ */
+static void mux_shutdown(struct uart_port *port)
+{
+	mux_ports[port->line].enabled = 0;
+}
+
+/**
+ * mux_set_termios - Chane port parameters.
+ * @port: Ptr to the uart_port.
+ * @termios: new termios settings.
+ * @old: old termios settings.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void
+mux_set_termios(struct uart_port *port, struct ktermios *termios,
+	        const struct ktermios *old)
+{
+}
+
+/**
+ * mux_type - Describe the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Return a pointer to a string constant describing the
+ * specified port.
+ */
+static const char *mux_type(struct uart_port *port)
+{
+	return "Mux";
+}
+
+/**
+ * mux_release_port - Release memory and IO regions.
+ * @port: Ptr to the uart_port.
+ * 
+ * Release any memory and IO region resources currently in use by
+ * the port.
+ */
+static void mux_release_port(struct uart_port *port)
+{
+}
+
+/**
+ * mux_request_port - Request memory and IO regions.
+ * @port: Ptr to the uart_port.
+ *
+ * Request any memory and IO region resources required by the port.
+ * If any fail, no resources should be registered when this function
+ * returns, and it should return -EBUSY on failure.
+ */
+static int mux_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+/**
+ * mux_config_port - Perform port autoconfiguration.
+ * @port: Ptr to the uart_port.
+ * @type: Bitmask of required configurations.
+ *
+ * Perform any autoconfiguration steps for the port.  This function is
+ * called if the UPF_BOOT_AUTOCONF flag is specified for the port.
+ * [Note: This is required for now because of a bug in the Serial core.
+ *  rmk has already submitted a patch to linus, should be available for
+ *  2.5.47.]
+ */
+static void mux_config_port(struct uart_port *port, int type)
+{
+	port->type = PORT_MUX;
+}
+
+/**
+ * mux_verify_port - Verify the port information.
+ * @port: Ptr to the uart_port.
+ * @ser: Ptr to the serial information.
+ *
+ * Verify the new serial port information contained within serinfo is
+ * suitable for this port type.
+ */
+static int mux_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	if(port->membase == NULL)
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * mux_poll - Mux poll function.
+ * @unused: Unused variable
+ *
+ * This function periodically polls the Serial MUX to check for new data.
+ */
+static void mux_poll(struct timer_list *unused)
+{  
+	int i;
+
+	for(i = 0; i < port_cnt; ++i) {
+		if(!mux_ports[i].enabled)
+			continue;
+
+		mux_read(&mux_ports[i].port);
+		mux_write(&mux_ports[i].port);
+	}
+
+	mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+}
+
+
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+static void mux_console_write(struct console *co, const char *s, unsigned count)
+{
+	/* Wait until the FIFO drains. */
+	while(UART_GET_FIFO_CNT(&mux_ports[0].port))
+		udelay(1);
+
+	while(count--) {
+		if(*s == '\n') {
+			UART_PUT_CHAR(&mux_ports[0].port, '\r');
+		}
+		UART_PUT_CHAR(&mux_ports[0].port, *s++);
+	}
+
+}
+
+static int mux_console_setup(struct console *co, char *options)
+{
+        return 0;
+}
+
+static struct console mux_console = {
+	.name =		"ttyB",
+	.write =	mux_console_write,
+	.device =	uart_console_device,
+	.setup =	mux_console_setup,
+	.flags =	CON_ENABLED | CON_PRINTBUFFER,
+	.index =	0,
+	.data =		&mux_driver,
+};
+
+#define MUX_CONSOLE	&mux_console
+#else
+#define MUX_CONSOLE	NULL
+#endif
+
+static const struct uart_ops mux_pops = {
+	.tx_empty =		mux_tx_empty,
+	.set_mctrl =		mux_set_mctrl,
+	.get_mctrl =		mux_get_mctrl,
+	.stop_tx =		mux_stop_tx,
+	.start_tx =		mux_start_tx,
+	.stop_rx =		mux_stop_rx,
+	.break_ctl =		mux_break_ctl,
+	.startup =		mux_startup,
+	.shutdown =		mux_shutdown,
+	.set_termios =		mux_set_termios,
+	.type =			mux_type,
+	.release_port =		mux_release_port,
+	.request_port =		mux_request_port,
+	.config_port =		mux_config_port,
+	.verify_port =		mux_verify_port,
+};
+
+/**
+ * mux_probe - Determine if the Serial Mux should claim this device.
+ * @dev: The parisc device.
+ *
+ * Deterimine if the Serial Mux should claim this chip (return 0)
+ * or not (return 1).
+ */
+static int __init mux_probe(struct parisc_device *dev)
+{
+	int i, status;
+
+	int port_count = get_mux_port_count(dev);
+	printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.6\n", port_count);
+
+	dev_set_drvdata(&dev->dev, (void *)(long)port_count);
+	request_mem_region(dev->hpa.start + MUX_OFFSET,
+                           port_count * MUX_LINE_OFFSET, "Mux");
+
+	if(!port_cnt) {
+		mux_driver.cons = MUX_CONSOLE;
+
+		status = uart_register_driver(&mux_driver);
+		if(status) {
+			printk(KERN_ERR "Serial mux: Unable to register driver.\n");
+			return 1;
+		}
+	}
+
+	for(i = 0; i < port_count; ++i, ++port_cnt) {
+		struct uart_port *port = &mux_ports[port_cnt].port;
+		port->iobase	= 0;
+		port->mapbase	= dev->hpa.start + MUX_OFFSET +
+						(i * MUX_LINE_OFFSET);
+		port->membase	= ioremap(port->mapbase, MUX_LINE_OFFSET);
+		port->iotype	= UPIO_MEM;
+		port->type	= PORT_MUX;
+		port->irq	= 0;
+		port->uartclk	= 0;
+		port->fifosize	= MUX_FIFO_SIZE;
+		port->ops	= &mux_pops;
+		port->flags	= UPF_BOOT_AUTOCONF;
+		port->line	= port_cnt;
+		port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MUX_CONSOLE);
+
+		spin_lock_init(&port->lock);
+
+		status = uart_add_one_port(&mux_driver, port);
+		BUG_ON(status);
+	}
+
+	return 0;
+}
+
+static void __exit mux_remove(struct parisc_device *dev)
+{
+	int i, j;
+	int port_count = (long)dev_get_drvdata(&dev->dev);
+
+	/* Find Port 0 for this card in the mux_ports list. */
+	for(i = 0; i < port_cnt; ++i) {
+		if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET)
+			break;
+	}
+	BUG_ON(i + port_count > port_cnt);
+
+	/* Release the resources associated with each port on the device. */
+	for(j = 0; j < port_count; ++j, ++i) {
+		struct uart_port *port = &mux_ports[i].port;
+
+		uart_remove_one_port(&mux_driver, port);
+		if(port->membase)
+			iounmap(port->membase);
+	}
+
+	release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET);
+}
+
+/* Hack.  This idea was taken from the 8250_gsc.c on how to properly order
+ * the serial port detection in the proper order.   The idea is we always
+ * want the builtin mux to be detected before addin mux cards, so we
+ * specifically probe for the builtin mux cards first.
+ *
+ * This table only contains the parisc_device_id of known builtin mux
+ * devices.  All other mux cards will be detected by the generic mux_tbl.
+ */
+static const struct parisc_device_id builtin_mux_tbl[] __initconst = {
+	{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */
+	{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */
+	{ 0, }
+};
+
+static const struct parisc_device_id mux_tbl[] __initconst = {
+	{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl);
+MODULE_DEVICE_TABLE(parisc, mux_tbl);
+
+static struct parisc_driver builtin_serial_mux_driver __refdata = {
+	.name =		"builtin_serial_mux",
+	.id_table =	builtin_mux_tbl,
+	.probe =	mux_probe,
+	.remove =       __exit_p(mux_remove),
+};
+
+static struct parisc_driver serial_mux_driver __refdata = {
+	.name =		"serial_mux",
+	.id_table =	mux_tbl,
+	.probe =	mux_probe,
+	.remove =       __exit_p(mux_remove),
+};
+
+/**
+ * mux_init - Serial MUX initialization procedure.
+ *
+ * Register the Serial MUX driver.
+ */
+static int __init mux_init(void)
+{
+	register_parisc_driver(&builtin_serial_mux_driver);
+	register_parisc_driver(&serial_mux_driver);
+
+	if(port_cnt > 0) {
+		/* Start the Mux timer */
+		timer_setup(&mux_timer, mux_poll, 0);
+		mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+	        register_console(&mux_console);
+#endif
+	}
+
+	return 0;
+}
+
+/**
+ * mux_exit - Serial MUX cleanup procedure.
+ *
+ * Unregister the Serial MUX driver from the tty layer.
+ */
+static void __exit mux_exit(void)
+{
+	/* Delete the Mux timer. */
+	if(port_cnt > 0) {
+		timer_delete_sync(&mux_timer);
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+		unregister_console(&mux_console);
+#endif
+	}
+
+	unregister_parisc_driver(&builtin_serial_mux_driver);
+	unregister_parisc_driver(&serial_mux_driver);
+	uart_unregister_driver(&mux_driver);
+}
+
+module_init(mux_init);
+module_exit(mux_exit);
+
+MODULE_AUTHOR("Ryan Bradetich");
+MODULE_DESCRIPTION("Serial MUX driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(MUX_MAJOR);