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, 822 insertions, 0 deletions

diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c
new file mode 100644
index 000000000..5abc01a2a
--- /dev/null
+++ b/drivers/bluetooth/hci_ll.c
@@ -0,0 +1,822 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Texas Instruments' Bluetooth HCILL UART protocol
+ *
+ *  HCILL (HCI Low Level) is a Texas Instruments' power management
+ *  protocol extension to H4.
+ *
+ *  Copyright (C) 2007 Texas Instruments, Inc.
+ *
+ *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
+ *
+ *  Acknowledgements:
+ *  This file is based on hci_h4.c, which was written
+ *  by Maxim Krasnyansky and Marcel Holtmann.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/of.h>
+#include <linux/serdev.h>
+#include <linux/skbuff.h>
+#include <linux/ti_wilink_st.h>
+#include <linux/clk.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <linux/gpio/consumer.h>
+#include <linux/nvmem-consumer.h>
+
+#include "hci_uart.h"
+
+/* Vendor-specific HCI commands */
+#define HCI_VS_WRITE_BD_ADDR			0xfc06
+#define HCI_VS_UPDATE_UART_HCI_BAUDRATE		0xff36
+
+/* HCILL commands */
+#define HCILL_GO_TO_SLEEP_IND	0x30
+#define HCILL_GO_TO_SLEEP_ACK	0x31
+#define HCILL_WAKE_UP_IND	0x32
+#define HCILL_WAKE_UP_ACK	0x33
+
+/* HCILL states */
+enum hcill_states_e {
+	HCILL_ASLEEP,
+	HCILL_ASLEEP_TO_AWAKE,
+	HCILL_AWAKE,
+	HCILL_AWAKE_TO_ASLEEP
+};
+
+struct ll_device {
+	struct hci_uart hu;
+	struct serdev_device *serdev;
+	struct gpio_desc *enable_gpio;
+	struct clk *ext_clk;
+	bdaddr_t bdaddr;
+};
+
+struct ll_struct {
+	struct sk_buff *rx_skb;
+	struct sk_buff_head txq;
+	spinlock_t hcill_lock;		/* HCILL state lock	*/
+	unsigned long hcill_state;	/* HCILL power state	*/
+	struct sk_buff_head tx_wait_q;	/* HCILL wait queue	*/
+};
+
+/*
+ * Builds and sends an HCILL command packet.
+ * These are very simple packets with only 1 cmd byte
+ */
+static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
+{
+	int err = 0;
+	struct sk_buff *skb = NULL;
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p cmd 0x%x", hu, cmd);
+
+	/* allocate packet */
+	skb = bt_skb_alloc(1, GFP_ATOMIC);
+	if (!skb) {
+		BT_ERR("cannot allocate memory for HCILL packet");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* prepare packet */
+	skb_put_u8(skb, cmd);
+
+	/* send packet */
+	skb_queue_tail(&ll->txq, skb);
+out:
+	return err;
+}
+
+/* Initialize protocol */
+static int ll_open(struct hci_uart *hu)
+{
+	struct ll_struct *ll;
+
+	BT_DBG("hu %p", hu);
+
+	ll = kzalloc(sizeof(*ll), GFP_KERNEL);
+	if (!ll)
+		return -ENOMEM;
+
+	skb_queue_head_init(&ll->txq);
+	skb_queue_head_init(&ll->tx_wait_q);
+	spin_lock_init(&ll->hcill_lock);
+
+	ll->hcill_state = HCILL_AWAKE;
+
+	hu->priv = ll;
+
+	if (hu->serdev) {
+		struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
+
+		if (!IS_ERR(lldev->ext_clk))
+			clk_prepare_enable(lldev->ext_clk);
+	}
+
+	return 0;
+}
+
+/* Flush protocol data */
+static int ll_flush(struct hci_uart *hu)
+{
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p", hu);
+
+	skb_queue_purge(&ll->tx_wait_q);
+	skb_queue_purge(&ll->txq);
+
+	return 0;
+}
+
+/* Close protocol */
+static int ll_close(struct hci_uart *hu)
+{
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p", hu);
+
+	skb_queue_purge(&ll->tx_wait_q);
+	skb_queue_purge(&ll->txq);
+
+	kfree_skb(ll->rx_skb);
+
+	if (hu->serdev) {
+		struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
+
+		gpiod_set_value_cansleep(lldev->enable_gpio, 0);
+
+		clk_disable_unprepare(lldev->ext_clk);
+	}
+
+	hu->priv = NULL;
+
+	kfree(ll);
+
+	return 0;
+}
+
+/*
+ * internal function, which does common work of the device wake up process:
+ * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
+ * 2. changes internal state to HCILL_AWAKE.
+ * Note: assumes that hcill_lock spinlock is taken,
+ * shouldn't be called otherwise!
+ */
+static void __ll_do_awake(struct ll_struct *ll)
+{
+	struct sk_buff *skb = NULL;
+
+	while ((skb = skb_dequeue(&ll->tx_wait_q)))
+		skb_queue_tail(&ll->txq, skb);
+
+	ll->hcill_state = HCILL_AWAKE;
+}
+
+/*
+ * Called upon a wake-up-indication from the device
+ */
+static void ll_device_want_to_wakeup(struct hci_uart *hu)
+{
+	unsigned long flags;
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p", hu);
+
+	/* lock hcill state */
+	spin_lock_irqsave(&ll->hcill_lock, flags);
+
+	switch (ll->hcill_state) {
+	case HCILL_ASLEEP_TO_AWAKE:
+		/*
+		 * This state means that both the host and the BRF chip
+		 * have simultaneously sent a wake-up-indication packet.
+		 * Traditionally, in this case, receiving a wake-up-indication
+		 * was enough and an additional wake-up-ack wasn't needed.
+		 * This has changed with the BRF6350, which does require an
+		 * explicit wake-up-ack. Other BRF versions, which do not
+		 * require an explicit ack here, do accept it, thus it is
+		 * perfectly safe to always send one.
+		 */
+		BT_DBG("dual wake-up-indication");
+		fallthrough;
+	case HCILL_ASLEEP:
+		/* acknowledge device wake up */
+		if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
+			BT_ERR("cannot acknowledge device wake up");
+			goto out;
+		}
+		break;
+	default:
+		/* any other state is illegal */
+		BT_ERR("received HCILL_WAKE_UP_IND in state %ld",
+		       ll->hcill_state);
+		break;
+	}
+
+	/* send pending packets and change state to HCILL_AWAKE */
+	__ll_do_awake(ll);
+
+out:
+	spin_unlock_irqrestore(&ll->hcill_lock, flags);
+
+	/* actually send the packets */
+	hci_uart_tx_wakeup(hu);
+}
+
+/*
+ * Called upon a sleep-indication from the device
+ */
+static void ll_device_want_to_sleep(struct hci_uart *hu)
+{
+	unsigned long flags;
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p", hu);
+
+	/* lock hcill state */
+	spin_lock_irqsave(&ll->hcill_lock, flags);
+
+	/* sanity check */
+	if (ll->hcill_state != HCILL_AWAKE)
+		BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld",
+		       ll->hcill_state);
+
+	/* acknowledge device sleep */
+	if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
+		BT_ERR("cannot acknowledge device sleep");
+		goto out;
+	}
+
+	/* update state */
+	ll->hcill_state = HCILL_ASLEEP;
+
+out:
+	spin_unlock_irqrestore(&ll->hcill_lock, flags);
+
+	/* actually send the sleep ack packet */
+	hci_uart_tx_wakeup(hu);
+}
+
+/*
+ * Called upon wake-up-acknowledgement from the device
+ */
+static void ll_device_woke_up(struct hci_uart *hu)
+{
+	unsigned long flags;
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p", hu);
+
+	/* lock hcill state */
+	spin_lock_irqsave(&ll->hcill_lock, flags);
+
+	/* sanity check */
+	if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
+		BT_ERR("received HCILL_WAKE_UP_ACK in state %ld",
+		       ll->hcill_state);
+
+	/* send pending packets and change state to HCILL_AWAKE */
+	__ll_do_awake(ll);
+
+	spin_unlock_irqrestore(&ll->hcill_lock, flags);
+
+	/* actually send the packets */
+	hci_uart_tx_wakeup(hu);
+}
+
+/* Enqueue frame for transmittion (padding, crc, etc) */
+/* may be called from two simultaneous tasklets */
+static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+	unsigned long flags = 0;
+	struct ll_struct *ll = hu->priv;
+
+	BT_DBG("hu %p skb %p", hu, skb);
+
+	/* Prepend skb with frame type */
+	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
+
+	/* lock hcill state */
+	spin_lock_irqsave(&ll->hcill_lock, flags);
+
+	/* act according to current state */
+	switch (ll->hcill_state) {
+	case HCILL_AWAKE:
+		BT_DBG("device awake, sending normally");
+		skb_queue_tail(&ll->txq, skb);
+		break;
+	case HCILL_ASLEEP:
+		BT_DBG("device asleep, waking up and queueing packet");
+		/* save packet for later */
+		skb_queue_tail(&ll->tx_wait_q, skb);
+		/* awake device */
+		if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
+			BT_ERR("cannot wake up device");
+			break;
+		}
+		ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
+		break;
+	case HCILL_ASLEEP_TO_AWAKE:
+		BT_DBG("device waking up, queueing packet");
+		/* transient state; just keep packet for later */
+		skb_queue_tail(&ll->tx_wait_q, skb);
+		break;
+	default:
+		BT_ERR("illegal hcill state: %ld (losing packet)",
+		       ll->hcill_state);
+		dev_kfree_skb_irq(skb);
+		break;
+	}
+
+	spin_unlock_irqrestore(&ll->hcill_lock, flags);
+
+	return 0;
+}
+
+static int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_uart *hu = hci_get_drvdata(hdev);
+	struct ll_struct *ll = hu->priv;
+
+	switch (hci_skb_pkt_type(skb)) {
+	case HCILL_GO_TO_SLEEP_IND:
+		BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
+		ll_device_want_to_sleep(hu);
+		break;
+	case HCILL_GO_TO_SLEEP_ACK:
+		/* shouldn't happen */
+		bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld",
+			   ll->hcill_state);
+		break;
+	case HCILL_WAKE_UP_IND:
+		BT_DBG("HCILL_WAKE_UP_IND packet");
+		ll_device_want_to_wakeup(hu);
+		break;
+	case HCILL_WAKE_UP_ACK:
+		BT_DBG("HCILL_WAKE_UP_ACK packet");
+		ll_device_woke_up(hu);
+		break;
+	}
+
+	kfree_skb(skb);
+	return 0;
+}
+
+#define LL_RECV_SLEEP_IND \
+	.type = HCILL_GO_TO_SLEEP_IND, \
+	.hlen = 0, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 0
+
+#define LL_RECV_SLEEP_ACK \
+	.type = HCILL_GO_TO_SLEEP_ACK, \
+	.hlen = 0, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 0
+
+#define LL_RECV_WAKE_IND \
+	.type = HCILL_WAKE_UP_IND, \
+	.hlen = 0, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 0
+
+#define LL_RECV_WAKE_ACK \
+	.type = HCILL_WAKE_UP_ACK, \
+	.hlen = 0, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 0
+
+static const struct h4_recv_pkt ll_recv_pkts[] = {
+	{ H4_RECV_ACL,       .recv = hci_recv_frame },
+	{ H4_RECV_SCO,       .recv = hci_recv_frame },
+	{ H4_RECV_EVENT,     .recv = hci_recv_frame },
+	{ LL_RECV_SLEEP_IND, .recv = ll_recv_frame  },
+	{ LL_RECV_SLEEP_ACK, .recv = ll_recv_frame  },
+	{ LL_RECV_WAKE_IND,  .recv = ll_recv_frame  },
+	{ LL_RECV_WAKE_ACK,  .recv = ll_recv_frame  },
+};
+
+/* Recv data */
+static int ll_recv(struct hci_uart *hu, const void *data, int count)
+{
+	struct ll_struct *ll = hu->priv;
+
+	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
+		return -EUNATCH;
+
+	ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count,
+				 ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts));
+	if (IS_ERR(ll->rx_skb)) {
+		int err = PTR_ERR(ll->rx_skb);
+		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
+		ll->rx_skb = NULL;
+		return err;
+	}
+
+	return count;
+}
+
+static struct sk_buff *ll_dequeue(struct hci_uart *hu)
+{
+	struct ll_struct *ll = hu->priv;
+
+	return skb_dequeue(&ll->txq);
+}
+
+#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
+static int read_local_version(struct hci_dev *hdev)
+{
+	int err = 0;
+	unsigned short version = 0;
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *ver;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Reading TI version information failed (%ld)",
+			   PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+	if (skb->len != sizeof(*ver)) {
+		err = -EILSEQ;
+		goto out;
+	}
+
+	ver = (struct hci_rp_read_local_version *)skb->data;
+	if (le16_to_cpu(ver->manufacturer) != 13) {
+		err = -ENODEV;
+		goto out;
+	}
+
+	version = le16_to_cpu(ver->lmp_subver);
+
+out:
+	if (err)
+		bt_dev_err(hdev, "Failed to read TI version info: %d", err);
+	kfree_skb(skb);
+	return err ? err : version;
+}
+
+static int send_command_from_firmware(struct ll_device *lldev,
+				      struct hci_command *cmd)
+{
+	struct sk_buff *skb;
+
+	if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
+		/* ignore remote change
+		 * baud rate HCI VS command
+		 */
+		bt_dev_warn(lldev->hu.hdev,
+			    "change remote baud rate command in firmware");
+		return 0;
+	}
+	if (cmd->prefix != 1)
+		bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
+
+	skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen,
+			     &cmd->speed, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(lldev->hu.hdev, "send command failed");
+		return PTR_ERR(skb);
+	}
+	kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * download_firmware -
+ *	internal function which parses through the .bts firmware
+ *	script file intreprets SEND, DELAY actions only as of now
+ */
+static int download_firmware(struct ll_device *lldev)
+{
+	unsigned short chip, min_ver, maj_ver;
+	int version, err, len;
+	unsigned char *ptr, *action_ptr;
+	unsigned char bts_scr_name[40];	/* 40 char long bts scr name? */
+	const struct firmware *fw;
+	struct hci_command *cmd;
+
+	version = read_local_version(lldev->hu.hdev);
+	if (version < 0)
+		return version;
+
+	chip = (version & 0x7C00) >> 10;
+	min_ver = (version & 0x007F);
+	maj_ver = (version & 0x0380) >> 7;
+	if (version & 0x8000)
+		maj_ver |= 0x0008;
+
+	snprintf(bts_scr_name, sizeof(bts_scr_name),
+		 "ti-connectivity/TIInit_%d.%d.%d.bts",
+		 chip, maj_ver, min_ver);
+
+	err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
+	if (err || !fw->data || !fw->size) {
+		bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
+			   err, bts_scr_name);
+		return -EINVAL;
+	}
+	ptr = (void *)fw->data;
+	len = fw->size;
+	/* bts_header to remove out magic number and
+	 * version
+	 */
+	ptr += sizeof(struct bts_header);
+	len -= sizeof(struct bts_header);
+
+	while (len > 0 && ptr) {
+		bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
+			   ((struct bts_action *)ptr)->size,
+			   ((struct bts_action *)ptr)->type);
+
+		action_ptr = &(((struct bts_action *)ptr)->data[0]);
+
+		switch (((struct bts_action *)ptr)->type) {
+		case ACTION_SEND_COMMAND:	/* action send */
+			bt_dev_dbg(lldev->hu.hdev, "S");
+			cmd = (struct hci_command *)action_ptr;
+			err = send_command_from_firmware(lldev, cmd);
+			if (err)
+				goto out_rel_fw;
+			break;
+		case ACTION_WAIT_EVENT:  /* wait */
+			/* no need to wait as command was synchronous */
+			bt_dev_dbg(lldev->hu.hdev, "W");
+			break;
+		case ACTION_DELAY:	/* sleep */
+			bt_dev_info(lldev->hu.hdev, "sleep command in scr");
+			msleep(((struct bts_action_delay *)action_ptr)->msec);
+			break;
+		}
+		len -= (sizeof(struct bts_action) +
+			((struct bts_action *)ptr)->size);
+		ptr += sizeof(struct bts_action) +
+			((struct bts_action *)ptr)->size;
+	}
+
+out_rel_fw:
+	/* fw download complete */
+	release_firmware(fw);
+	return err;
+}
+
+static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	bdaddr_t bdaddr_swapped;
+	struct sk_buff *skb;
+
+	/* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD
+	 * address to be MSB first, but bdaddr_t has the convention of being
+	 * LSB first.
+	 */
+	baswap(&bdaddr_swapped, bdaddr);
+	skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t),
+			     &bdaddr_swapped, HCI_INIT_TIMEOUT);
+	if (!IS_ERR(skb))
+		kfree_skb(skb);
+
+	return PTR_ERR_OR_ZERO(skb);
+}
+
+static int ll_setup(struct hci_uart *hu)
+{
+	int err, retry = 3;
+	struct ll_device *lldev;
+	struct serdev_device *serdev = hu->serdev;
+	u32 speed;
+
+	if (!serdev)
+		return 0;
+
+	lldev = serdev_device_get_drvdata(serdev);
+
+	hu->hdev->set_bdaddr = ll_set_bdaddr;
+
+	serdev_device_set_flow_control(serdev, true);
+
+	do {
+		/* Reset the Bluetooth device */
+		gpiod_set_value_cansleep(lldev->enable_gpio, 0);
+		msleep(5);
+		gpiod_set_value_cansleep(lldev->enable_gpio, 1);
+		mdelay(100);
+		err = serdev_device_wait_for_cts(serdev, true, 200);
+		if (err) {
+			bt_dev_err(hu->hdev, "Failed to get CTS");
+			return err;
+		}
+
+		err = download_firmware(lldev);
+		if (!err)
+			break;
+
+		/* Toggle BT_EN and retry */
+		bt_dev_err(hu->hdev, "download firmware failed, retrying...");
+	} while (retry--);
+
+	if (err)
+		return err;
+
+	/* Set BD address if one was specified at probe */
+	if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) {
+		/* This means that there was an error getting the BD address
+		 * during probe, so mark the device as having a bad address.
+		 */
+		set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
+	} else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) {
+		err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr);
+		if (err)
+			set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
+	}
+
+	/* Operational speed if any */
+	if (hu->oper_speed)
+		speed = hu->oper_speed;
+	else if (hu->proto->oper_speed)
+		speed = hu->proto->oper_speed;
+	else
+		speed = 0;
+
+	if (speed) {
+		__le32 speed_le = cpu_to_le32(speed);
+		struct sk_buff *skb;
+
+		skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
+				     sizeof(speed_le), &speed_le,
+				     HCI_INIT_TIMEOUT);
+		if (!IS_ERR(skb)) {
+			kfree_skb(skb);
+			serdev_device_set_baudrate(serdev, speed);
+		}
+	}
+
+	return 0;
+}
+
+static const struct hci_uart_proto llp;
+
+static int hci_ti_probe(struct serdev_device *serdev)
+{
+	struct hci_uart *hu;
+	struct ll_device *lldev;
+	struct nvmem_cell *bdaddr_cell;
+	u32 max_speed = 3000000;
+
+	lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
+	if (!lldev)
+		return -ENOMEM;
+	hu = &lldev->hu;
+
+	serdev_device_set_drvdata(serdev, lldev);
+	lldev->serdev = hu->serdev = serdev;
+
+	lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev,
+						     "enable",
+						     GPIOD_OUT_LOW);
+	if (IS_ERR(lldev->enable_gpio))
+		return PTR_ERR(lldev->enable_gpio);
+
+	lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
+	if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
+		return PTR_ERR(lldev->ext_clk);
+
+	of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
+	hci_uart_set_speeds(hu, 115200, max_speed);
+
+	/* optional BD address from nvram */
+	bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address");
+	if (IS_ERR(bdaddr_cell)) {
+		int err = PTR_ERR(bdaddr_cell);
+
+		if (err == -EPROBE_DEFER)
+			return err;
+
+		/* ENOENT means there is no matching nvmem cell and ENOSYS
+		 * means that nvmem is not enabled in the kernel configuration.
+		 */
+		if (err != -ENOENT && err != -ENOSYS) {
+			/* If there was some other error, give userspace a
+			 * chance to fix the problem instead of failing to load
+			 * the driver. Using BDADDR_NONE as a flag that is
+			 * tested later in the setup function.
+			 */
+			dev_warn(&serdev->dev,
+				 "Failed to get \"bd-address\" nvmem cell (%d)\n",
+				 err);
+			bacpy(&lldev->bdaddr, BDADDR_NONE);
+		}
+	} else {
+		bdaddr_t *bdaddr;
+		size_t len;
+
+		bdaddr = nvmem_cell_read(bdaddr_cell, &len);
+		nvmem_cell_put(bdaddr_cell);
+		if (IS_ERR(bdaddr)) {
+			dev_err(&serdev->dev, "Failed to read nvmem bd-address\n");
+			return PTR_ERR(bdaddr);
+		}
+		if (len != sizeof(bdaddr_t)) {
+			dev_err(&serdev->dev, "Invalid nvmem bd-address length\n");
+			kfree(bdaddr);
+			return -EINVAL;
+		}
+
+		/* As per the device tree bindings, the value from nvmem is
+		 * expected to be MSB first, but in the kernel it is expected
+		 * that bdaddr_t is LSB first.
+		 */
+		baswap(&lldev->bdaddr, bdaddr);
+		kfree(bdaddr);
+	}
+
+	return hci_uart_register_device(hu, &llp);
+}
+
+static void hci_ti_remove(struct serdev_device *serdev)
+{
+	struct ll_device *lldev = serdev_device_get_drvdata(serdev);
+
+	hci_uart_unregister_device(&lldev->hu);
+}
+
+static const struct of_device_id hci_ti_of_match[] = {
+	{ .compatible = "ti,cc2560" },
+	{ .compatible = "ti,wl1271-st" },
+	{ .compatible = "ti,wl1273-st" },
+	{ .compatible = "ti,wl1281-st" },
+	{ .compatible = "ti,wl1283-st" },
+	{ .compatible = "ti,wl1285-st" },
+	{ .compatible = "ti,wl1801-st" },
+	{ .compatible = "ti,wl1805-st" },
+	{ .compatible = "ti,wl1807-st" },
+	{ .compatible = "ti,wl1831-st" },
+	{ .compatible = "ti,wl1835-st" },
+	{ .compatible = "ti,wl1837-st" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, hci_ti_of_match);
+
+static struct serdev_device_driver hci_ti_drv = {
+	.driver		= {
+		.name	= "hci-ti",
+		.of_match_table = of_match_ptr(hci_ti_of_match),
+	},
+	.probe	= hci_ti_probe,
+	.remove	= hci_ti_remove,
+};
+#else
+#define ll_setup NULL
+#endif
+
+static const struct hci_uart_proto llp = {
+	.id		= HCI_UART_LL,
+	.name		= "LL",
+	.setup		= ll_setup,
+	.open		= ll_open,
+	.close		= ll_close,
+	.recv		= ll_recv,
+	.enqueue	= ll_enqueue,
+	.dequeue	= ll_dequeue,
+	.flush		= ll_flush,
+};
+
+int __init ll_init(void)
+{
+	serdev_device_driver_register(&hci_ti_drv);
+
+	return hci_uart_register_proto(&llp);
+}
+
+int __exit ll_deinit(void)
+{
+	serdev_device_driver_unregister(&hci_ti_drv);
+
+	return hci_uart_unregister_proto(&llp);
+}