Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 772 insertions, 0 deletions

diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c
new file mode 100644
index 000000000..e99970a94
--- /dev/null
+++ b/drivers/tty/serial/owl-uart.c
@@ -0,0 +1,772 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Actions Semi Owl family serial console
+ *
+ * Copyright 2013 Actions Semi Inc.
+ * Author: Actions Semi, Inc.
+ *
+ * Copyright (c) 2016-2017 Andreas Färber
+ */
+
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#define OWL_UART_PORT_NUM 7
+#define OWL_UART_DEV_NAME "ttyOWL"
+
+#define OWL_UART_CTL	0x000
+#define OWL_UART_RXDAT	0x004
+#define OWL_UART_TXDAT	0x008
+#define OWL_UART_STAT	0x00c
+
+#define OWL_UART_CTL_DWLS_MASK		GENMASK(1, 0)
+#define OWL_UART_CTL_DWLS_5BITS		(0x0 << 0)
+#define OWL_UART_CTL_DWLS_6BITS		(0x1 << 0)
+#define OWL_UART_CTL_DWLS_7BITS		(0x2 << 0)
+#define OWL_UART_CTL_DWLS_8BITS		(0x3 << 0)
+#define OWL_UART_CTL_STPS_2BITS		BIT(2)
+#define OWL_UART_CTL_PRS_MASK		GENMASK(6, 4)
+#define OWL_UART_CTL_PRS_NONE		(0x0 << 4)
+#define OWL_UART_CTL_PRS_ODD		(0x4 << 4)
+#define OWL_UART_CTL_PRS_MARK		(0x5 << 4)
+#define OWL_UART_CTL_PRS_EVEN		(0x6 << 4)
+#define OWL_UART_CTL_PRS_SPACE		(0x7 << 4)
+#define OWL_UART_CTL_AFE		BIT(12)
+#define OWL_UART_CTL_TRFS_TX		BIT(14)
+#define OWL_UART_CTL_EN			BIT(15)
+#define OWL_UART_CTL_RXDE		BIT(16)
+#define OWL_UART_CTL_TXDE		BIT(17)
+#define OWL_UART_CTL_RXIE		BIT(18)
+#define OWL_UART_CTL_TXIE		BIT(19)
+#define OWL_UART_CTL_LBEN		BIT(20)
+
+#define OWL_UART_STAT_RIP		BIT(0)
+#define OWL_UART_STAT_TIP		BIT(1)
+#define OWL_UART_STAT_RXER		BIT(2)
+#define OWL_UART_STAT_TFER		BIT(3)
+#define OWL_UART_STAT_RXST		BIT(4)
+#define OWL_UART_STAT_RFEM		BIT(5)
+#define OWL_UART_STAT_TFFU		BIT(6)
+#define OWL_UART_STAT_CTSS		BIT(7)
+#define OWL_UART_STAT_RTSS		BIT(8)
+#define OWL_UART_STAT_TFES		BIT(10)
+#define OWL_UART_STAT_TRFL_MASK		GENMASK(16, 11)
+#define OWL_UART_STAT_UTBB		BIT(17)
+
+#define OWL_UART_POLL_USEC		5
+#define OWL_UART_TIMEOUT_USEC		10000
+
+static struct uart_driver owl_uart_driver;
+
+struct owl_uart_info {
+	unsigned int tx_fifosize;
+};
+
+struct owl_uart_port {
+	struct uart_port port;
+	struct clk *clk;
+};
+
+#define to_owl_uart_port(prt) container_of(prt, struct owl_uart_port, prt)
+
+static struct owl_uart_port *owl_uart_ports[OWL_UART_PORT_NUM];
+
+static inline void owl_uart_write(struct uart_port *port, u32 val, unsigned int off)
+{
+	writel(val, port->membase + off);
+}
+
+static inline u32 owl_uart_read(struct uart_port *port, unsigned int off)
+{
+	return readl(port->membase + off);
+}
+
+static void owl_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	u32 ctl;
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+
+	if (mctrl & TIOCM_LOOP)
+		ctl |= OWL_UART_CTL_LBEN;
+	else
+		ctl &= ~OWL_UART_CTL_LBEN;
+
+	owl_uart_write(port, ctl, OWL_UART_CTL);
+}
+
+static unsigned int owl_uart_get_mctrl(struct uart_port *port)
+{
+	unsigned int mctrl = TIOCM_CAR | TIOCM_DSR;
+	u32 stat, ctl;
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	if (stat & OWL_UART_STAT_RTSS)
+		mctrl |= TIOCM_RTS;
+	if ((stat & OWL_UART_STAT_CTSS) || !(ctl & OWL_UART_CTL_AFE))
+		mctrl |= TIOCM_CTS;
+	return mctrl;
+}
+
+static unsigned int owl_uart_tx_empty(struct uart_port *port)
+{
+	unsigned long flags;
+	u32 val;
+	unsigned int ret;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	ret = (val & OWL_UART_STAT_TFES) ? TIOCSER_TEMT : 0;
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return ret;
+}
+
+static void owl_uart_stop_rx(struct uart_port *port)
+{
+	u32 val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_RXIE | OWL_UART_CTL_RXDE);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_RIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+}
+
+static void owl_uart_stop_tx(struct uart_port *port)
+{
+	u32 val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_TXIE | OWL_UART_CTL_TXDE);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_TIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+}
+
+static void owl_uart_start_tx(struct uart_port *port)
+{
+	u32 val;
+
+	if (uart_tx_stopped(port)) {
+		owl_uart_stop_tx(port);
+		return;
+	}
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_TIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val |= OWL_UART_CTL_TXIE;
+	owl_uart_write(port, val, OWL_UART_CTL);
+}
+
+static void owl_uart_send_chars(struct uart_port *port)
+{
+	u8 ch;
+
+	uart_port_tx(port, ch,
+		!(owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_TFFU),
+		owl_uart_write(port, ch, OWL_UART_TXDAT));
+}
+
+static void owl_uart_receive_chars(struct uart_port *port)
+{
+	u32 stat, val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~OWL_UART_CTL_TRFS_TX;
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	while (!(stat & OWL_UART_STAT_RFEM)) {
+		char flag = TTY_NORMAL;
+
+		if (stat & OWL_UART_STAT_RXER)
+			port->icount.overrun++;
+
+		if (stat & OWL_UART_STAT_RXST) {
+			/* We are not able to distinguish the error type. */
+			port->icount.brk++;
+			port->icount.frame++;
+
+			stat &= port->read_status_mask;
+			if (stat & OWL_UART_STAT_RXST)
+				flag = TTY_PARITY;
+		} else
+			port->icount.rx++;
+
+		val = owl_uart_read(port, OWL_UART_RXDAT);
+		val &= 0xff;
+
+		if ((stat & port->ignore_status_mask) == 0)
+			tty_insert_flip_char(&port->state->port, val, flag);
+
+		stat = owl_uart_read(port, OWL_UART_STAT);
+	}
+
+	tty_flip_buffer_push(&port->state->port);
+}
+
+static irqreturn_t owl_uart_irq(int irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	unsigned long flags;
+	u32 stat;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+
+	if (stat & OWL_UART_STAT_RIP)
+		owl_uart_receive_chars(port);
+
+	if (stat & OWL_UART_STAT_TIP)
+		owl_uart_send_chars(port);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	stat |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP;
+	owl_uart_write(port, stat, OWL_UART_STAT);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static void owl_uart_shutdown(struct uart_port *port)
+{
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_TXIE | OWL_UART_CTL_RXIE
+		| OWL_UART_CTL_TXDE | OWL_UART_CTL_RXDE | OWL_UART_CTL_EN);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	free_irq(port->irq, port);
+}
+
+static int owl_uart_startup(struct uart_port *port)
+{
+	u32 val;
+	unsigned long flags;
+	int ret;
+
+	ret = request_irq(port->irq, owl_uart_irq, IRQF_TRIGGER_HIGH,
+			"owl-uart", port);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP
+		| OWL_UART_STAT_RXER | OWL_UART_STAT_TFER | OWL_UART_STAT_RXST;
+	owl_uart_write(port, val, OWL_UART_STAT);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val |= OWL_UART_CTL_RXIE | OWL_UART_CTL_TXIE;
+	val |= OWL_UART_CTL_EN;
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return 0;
+}
+
+static void owl_uart_change_baudrate(struct owl_uart_port *owl_port,
+				     unsigned long baud)
+{
+	clk_set_rate(owl_port->clk, baud * 8);
+}
+
+static void owl_uart_set_termios(struct uart_port *port,
+				 struct ktermios *termios,
+				 const struct ktermios *old)
+{
+	struct owl_uart_port *owl_port = to_owl_uart_port(port);
+	unsigned int baud;
+	u32 ctl;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+
+	ctl &= ~OWL_UART_CTL_DWLS_MASK;
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		ctl |= OWL_UART_CTL_DWLS_5BITS;
+		break;
+	case CS6:
+		ctl |= OWL_UART_CTL_DWLS_6BITS;
+		break;
+	case CS7:
+		ctl |= OWL_UART_CTL_DWLS_7BITS;
+		break;
+	case CS8:
+	default:
+		ctl |= OWL_UART_CTL_DWLS_8BITS;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		ctl |= OWL_UART_CTL_STPS_2BITS;
+	else
+		ctl &= ~OWL_UART_CTL_STPS_2BITS;
+
+	ctl &= ~OWL_UART_CTL_PRS_MASK;
+	if (termios->c_cflag & PARENB) {
+		if (termios->c_cflag & CMSPAR) {
+			if (termios->c_cflag & PARODD)
+				ctl |= OWL_UART_CTL_PRS_MARK;
+			else
+				ctl |= OWL_UART_CTL_PRS_SPACE;
+		} else if (termios->c_cflag & PARODD)
+			ctl |= OWL_UART_CTL_PRS_ODD;
+		else
+			ctl |= OWL_UART_CTL_PRS_EVEN;
+	} else
+		ctl |= OWL_UART_CTL_PRS_NONE;
+
+	if (termios->c_cflag & CRTSCTS)
+		ctl |= OWL_UART_CTL_AFE;
+	else
+		ctl &= ~OWL_UART_CTL_AFE;
+
+	owl_uart_write(port, ctl, OWL_UART_CTL);
+
+	baud = uart_get_baud_rate(port, termios, old, 9600, 3200000);
+	owl_uart_change_baudrate(owl_port, baud);
+
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+
+	port->read_status_mask |= OWL_UART_STAT_RXER;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= OWL_UART_STAT_RXST;
+
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void owl_uart_release_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return;
+
+	if (port->flags & UPF_IOREMAP) {
+		devm_release_mem_region(port->dev, port->mapbase,
+			resource_size(res));
+		devm_iounmap(port->dev, port->membase);
+		port->membase = NULL;
+	}
+}
+
+static int owl_uart_request_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENXIO;
+
+	if (!devm_request_mem_region(port->dev, port->mapbase,
+			resource_size(res), dev_name(port->dev)))
+		return -EBUSY;
+
+	if (port->flags & UPF_IOREMAP) {
+		port->membase = devm_ioremap(port->dev, port->mapbase,
+				resource_size(res));
+		if (!port->membase)
+			return -EBUSY;
+	}
+
+	return 0;
+}
+
+static const char *owl_uart_type(struct uart_port *port)
+{
+	return (port->type == PORT_OWL) ? "owl-uart" : NULL;
+}
+
+static int owl_uart_verify_port(struct uart_port *port,
+				struct serial_struct *ser)
+{
+	if (port->type != PORT_OWL)
+		return -EINVAL;
+
+	if (port->irq != ser->irq)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void owl_uart_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE) {
+		port->type = PORT_OWL;
+		owl_uart_request_port(port);
+	}
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+
+static int owl_uart_poll_get_char(struct uart_port *port)
+{
+	if (owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_RFEM)
+		return NO_POLL_CHAR;
+
+	return owl_uart_read(port, OWL_UART_RXDAT);
+}
+
+static void owl_uart_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+	u32 reg;
+	int ret;
+
+	/* Wait while FIFO is full or timeout */
+	ret = readl_poll_timeout_atomic(port->membase + OWL_UART_STAT, reg,
+					!(reg & OWL_UART_STAT_TFFU),
+					OWL_UART_POLL_USEC,
+					OWL_UART_TIMEOUT_USEC);
+	if (ret == -ETIMEDOUT) {
+		dev_err(port->dev, "Timeout waiting while UART TX FULL\n");
+		return;
+	}
+
+	owl_uart_write(port, ch, OWL_UART_TXDAT);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static const struct uart_ops owl_uart_ops = {
+	.set_mctrl = owl_uart_set_mctrl,
+	.get_mctrl = owl_uart_get_mctrl,
+	.tx_empty = owl_uart_tx_empty,
+	.start_tx = owl_uart_start_tx,
+	.stop_rx = owl_uart_stop_rx,
+	.stop_tx = owl_uart_stop_tx,
+	.startup = owl_uart_startup,
+	.shutdown = owl_uart_shutdown,
+	.set_termios = owl_uart_set_termios,
+	.type = owl_uart_type,
+	.config_port = owl_uart_config_port,
+	.request_port = owl_uart_request_port,
+	.release_port = owl_uart_release_port,
+	.verify_port = owl_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = owl_uart_poll_get_char,
+	.poll_put_char = owl_uart_poll_put_char,
+#endif
+};
+
+#ifdef CONFIG_SERIAL_OWL_CONSOLE
+
+static void owl_console_putchar(struct uart_port *port, unsigned char ch)
+{
+	if (!port->membase)
+		return;
+
+	while (owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_TFFU)
+		cpu_relax();
+
+	owl_uart_write(port, ch, OWL_UART_TXDAT);
+}
+
+static void owl_uart_port_write(struct uart_port *port, const char *s,
+				u_int count)
+{
+	u32 old_ctl, val;
+	unsigned long flags;
+	int locked;
+
+	local_irq_save(flags);
+
+	if (port->sysrq)
+		locked = 0;
+	else if (oops_in_progress)
+		locked = spin_trylock(&port->lock);
+	else {
+		spin_lock(&port->lock);
+		locked = 1;
+	}
+
+	old_ctl = owl_uart_read(port, OWL_UART_CTL);
+	val = old_ctl | OWL_UART_CTL_TRFS_TX;
+	/* disable IRQ */
+	val &= ~(OWL_UART_CTL_RXIE | OWL_UART_CTL_TXIE);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	uart_console_write(port, s, count, owl_console_putchar);
+
+	/* wait until all contents have been sent out */
+	while (owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_TRFL_MASK)
+		cpu_relax();
+
+	/* clear IRQ pending */
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_TIP | OWL_UART_STAT_RIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+
+	owl_uart_write(port, old_ctl, OWL_UART_CTL);
+
+	if (locked)
+		spin_unlock(&port->lock);
+
+	local_irq_restore(flags);
+}
+
+static void owl_uart_console_write(struct console *co, const char *s,
+				   u_int count)
+{
+	struct owl_uart_port *owl_port;
+
+	owl_port = owl_uart_ports[co->index];
+	if (!owl_port)
+		return;
+
+	owl_uart_port_write(&owl_port->port, s, count);
+}
+
+static int owl_uart_console_setup(struct console *co, char *options)
+{
+	struct owl_uart_port *owl_port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index < 0 || co->index >= OWL_UART_PORT_NUM)
+		return -EINVAL;
+
+	owl_port = owl_uart_ports[co->index];
+	if (!owl_port || !owl_port->port.membase)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(&owl_port->port, co, baud, parity, bits, flow);
+}
+
+static struct console owl_uart_console = {
+	.name = OWL_UART_DEV_NAME,
+	.write = owl_uart_console_write,
+	.device = uart_console_device,
+	.setup = owl_uart_console_setup,
+	.flags = CON_PRINTBUFFER,
+	.index = -1,
+	.data = &owl_uart_driver,
+};
+
+static int __init owl_uart_console_init(void)
+{
+	register_console(&owl_uart_console);
+
+	return 0;
+}
+console_initcall(owl_uart_console_init);
+
+static void owl_uart_early_console_write(struct console *co,
+					 const char *s,
+					 u_int count)
+{
+	struct earlycon_device *dev = co->data;
+
+	owl_uart_port_write(&dev->port, s, count);
+}
+
+static int __init
+owl_uart_early_console_setup(struct earlycon_device *device, const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = owl_uart_early_console_write;
+
+	return 0;
+}
+OF_EARLYCON_DECLARE(owl, "actions,owl-uart",
+		    owl_uart_early_console_setup);
+
+#define OWL_UART_CONSOLE (&owl_uart_console)
+#else
+#define OWL_UART_CONSOLE NULL
+#endif
+
+static struct uart_driver owl_uart_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = "owl-uart",
+	.dev_name = OWL_UART_DEV_NAME,
+	.nr = OWL_UART_PORT_NUM,
+	.cons = OWL_UART_CONSOLE,
+};
+
+static const struct owl_uart_info owl_s500_info = {
+	.tx_fifosize = 16,
+};
+
+static const struct owl_uart_info owl_s900_info = {
+	.tx_fifosize = 32,
+};
+
+static const struct of_device_id owl_uart_dt_matches[] = {
+	{ .compatible = "actions,s500-uart", .data = &owl_s500_info },
+	{ .compatible = "actions,s900-uart", .data = &owl_s900_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, owl_uart_dt_matches);
+
+static int owl_uart_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	const struct owl_uart_info *info = NULL;
+	struct resource *res_mem;
+	struct owl_uart_port *owl_port;
+	int ret, irq;
+
+	if (pdev->dev.of_node) {
+		pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
+		match = of_match_node(owl_uart_dt_matches, pdev->dev.of_node);
+		if (match)
+			info = match->data;
+	}
+
+	if (pdev->id < 0 || pdev->id >= OWL_UART_PORT_NUM) {
+		dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
+		return -EINVAL;
+	}
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_mem) {
+		dev_err(&pdev->dev, "could not get mem\n");
+		return -ENODEV;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	if (owl_uart_ports[pdev->id]) {
+		dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
+		return -EBUSY;
+	}
+
+	owl_port = devm_kzalloc(&pdev->dev, sizeof(*owl_port), GFP_KERNEL);
+	if (!owl_port)
+		return -ENOMEM;
+
+	owl_port->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(owl_port->clk)) {
+		dev_err(&pdev->dev, "could not get clk\n");
+		return PTR_ERR(owl_port->clk);
+	}
+
+	ret = clk_prepare_enable(owl_port->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "could not enable clk\n");
+		return ret;
+	}
+
+	owl_port->port.dev = &pdev->dev;
+	owl_port->port.line = pdev->id;
+	owl_port->port.type = PORT_OWL;
+	owl_port->port.iotype = UPIO_MEM;
+	owl_port->port.mapbase = res_mem->start;
+	owl_port->port.irq = irq;
+	owl_port->port.uartclk = clk_get_rate(owl_port->clk);
+	if (owl_port->port.uartclk == 0) {
+		dev_err(&pdev->dev, "clock rate is zero\n");
+		clk_disable_unprepare(owl_port->clk);
+		return -EINVAL;
+	}
+	owl_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;
+	owl_port->port.x_char = 0;
+	owl_port->port.fifosize = (info) ? info->tx_fifosize : 16;
+	owl_port->port.ops = &owl_uart_ops;
+
+	owl_uart_ports[pdev->id] = owl_port;
+	platform_set_drvdata(pdev, owl_port);
+
+	ret = uart_add_one_port(&owl_uart_driver, &owl_port->port);
+	if (ret)
+		owl_uart_ports[pdev->id] = NULL;
+
+	return ret;
+}
+
+static int owl_uart_remove(struct platform_device *pdev)
+{
+	struct owl_uart_port *owl_port = platform_get_drvdata(pdev);
+
+	uart_remove_one_port(&owl_uart_driver, &owl_port->port);
+	owl_uart_ports[pdev->id] = NULL;
+	clk_disable_unprepare(owl_port->clk);
+
+	return 0;
+}
+
+static struct platform_driver owl_uart_platform_driver = {
+	.probe = owl_uart_probe,
+	.remove = owl_uart_remove,
+	.driver = {
+		.name = "owl-uart",
+		.of_match_table = owl_uart_dt_matches,
+	},
+};
+
+static int __init owl_uart_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&owl_uart_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&owl_uart_platform_driver);
+	if (ret)
+		uart_unregister_driver(&owl_uart_driver);
+
+	return ret;
+}
+
+static void __exit owl_uart_exit(void)
+{
+	platform_driver_unregister(&owl_uart_platform_driver);
+	uart_unregister_driver(&owl_uart_driver);
+}
+
+module_init(owl_uart_init);
+module_exit(owl_uart_exit);
+
+MODULE_LICENSE("GPL");