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, 616 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath12k/mhi.c b/drivers/net/wireless/ath/ath12k/mhi.c
new file mode 100644
index 000000000..42f1140ba
--- /dev/null
+++ b/drivers/net/wireless/ath/ath12k/mhi.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+/*
+ * Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/msi.h>
+#include <linux/pci.h>
+
+#include "core.h"
+#include "debug.h"
+#include "mhi.h"
+#include "pci.h"
+
+#define MHI_TIMEOUT_DEFAULT_MS	90000
+
+static const struct mhi_channel_config ath12k_mhi_channels_qcn9274[] = {
+	{
+		.num = 0,
+		.name = "LOOPBACK",
+		.num_elements = 32,
+		.event_ring = 1,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 1,
+		.name = "LOOPBACK",
+		.num_elements = 32,
+		.event_ring = 1,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 20,
+		.name = "IPCR",
+		.num_elements = 32,
+		.event_ring = 1,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 21,
+		.name = "IPCR",
+		.num_elements = 32,
+		.event_ring = 1,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = true,
+	},
+};
+
+static struct mhi_event_config ath12k_mhi_events_qcn9274[] = {
+	{
+		.num_elements = 32,
+		.irq_moderation_ms = 0,
+		.irq = 1,
+		.data_type = MHI_ER_CTRL,
+		.mode = MHI_DB_BRST_DISABLE,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+	{
+		.num_elements = 256,
+		.irq_moderation_ms = 1,
+		.irq = 2,
+		.mode = MHI_DB_BRST_DISABLE,
+		.priority = 1,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+};
+
+const struct mhi_controller_config ath12k_mhi_config_qcn9274 = {
+	.max_channels = 30,
+	.timeout_ms = 10000,
+	.use_bounce_buf = false,
+	.buf_len = 0,
+	.num_channels = ARRAY_SIZE(ath12k_mhi_channels_qcn9274),
+	.ch_cfg = ath12k_mhi_channels_qcn9274,
+	.num_events = ARRAY_SIZE(ath12k_mhi_events_qcn9274),
+	.event_cfg = ath12k_mhi_events_qcn9274,
+};
+
+static const struct mhi_channel_config ath12k_mhi_channels_wcn7850[] = {
+	{
+		.num = 0,
+		.name = "LOOPBACK",
+		.num_elements = 32,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 1,
+		.name = "LOOPBACK",
+		.num_elements = 32,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 20,
+		.name = "IPCR",
+		.num_elements = 64,
+		.event_ring = 1,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+	},
+	{
+		.num = 21,
+		.name = "IPCR",
+		.num_elements = 64,
+		.event_ring = 1,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = 0x4,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = true,
+	},
+};
+
+static struct mhi_event_config ath12k_mhi_events_wcn7850[] = {
+	{
+		.num_elements = 32,
+		.irq_moderation_ms = 0,
+		.irq = 1,
+		.mode = MHI_DB_BRST_DISABLE,
+		.data_type = MHI_ER_CTRL,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+	{
+		.num_elements = 256,
+		.irq_moderation_ms = 1,
+		.irq = 2,
+		.mode = MHI_DB_BRST_DISABLE,
+		.priority = 1,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+};
+
+const struct mhi_controller_config ath12k_mhi_config_wcn7850 = {
+	.max_channels = 128,
+	.timeout_ms = 2000,
+	.use_bounce_buf = false,
+	.buf_len = 0,
+	.num_channels = ARRAY_SIZE(ath12k_mhi_channels_wcn7850),
+	.ch_cfg = ath12k_mhi_channels_wcn7850,
+	.num_events = ARRAY_SIZE(ath12k_mhi_events_wcn7850),
+	.event_cfg = ath12k_mhi_events_wcn7850,
+};
+
+void ath12k_mhi_set_mhictrl_reset(struct ath12k_base *ab)
+{
+	u32 val;
+
+	val = ath12k_pci_read32(ab, MHISTATUS);
+
+	ath12k_dbg(ab, ATH12K_DBG_PCI, "MHISTATUS 0x%x\n", val);
+
+	/* Observed on some targets that after SOC_GLOBAL_RESET, MHISTATUS
+	 * has SYSERR bit set and thus need to set MHICTRL_RESET
+	 * to clear SYSERR.
+	 */
+	ath12k_pci_write32(ab, MHICTRL, MHICTRL_RESET_MASK);
+
+	mdelay(10);
+}
+
+static void ath12k_mhi_reset_txvecdb(struct ath12k_base *ab)
+{
+	ath12k_pci_write32(ab, PCIE_TXVECDB, 0);
+}
+
+static void ath12k_mhi_reset_txvecstatus(struct ath12k_base *ab)
+{
+	ath12k_pci_write32(ab, PCIE_TXVECSTATUS, 0);
+}
+
+static void ath12k_mhi_reset_rxvecdb(struct ath12k_base *ab)
+{
+	ath12k_pci_write32(ab, PCIE_RXVECDB, 0);
+}
+
+static void ath12k_mhi_reset_rxvecstatus(struct ath12k_base *ab)
+{
+	ath12k_pci_write32(ab, PCIE_RXVECSTATUS, 0);
+}
+
+void ath12k_mhi_clear_vector(struct ath12k_base *ab)
+{
+	ath12k_mhi_reset_txvecdb(ab);
+	ath12k_mhi_reset_txvecstatus(ab);
+	ath12k_mhi_reset_rxvecdb(ab);
+	ath12k_mhi_reset_rxvecstatus(ab);
+}
+
+static int ath12k_mhi_get_msi(struct ath12k_pci *ab_pci)
+{
+	struct ath12k_base *ab = ab_pci->ab;
+	u32 user_base_data, base_vector;
+	int ret, num_vectors, i;
+	int *irq;
+
+	ret = ath12k_pci_get_user_msi_assignment(ab,
+						 "MHI", &num_vectors,
+						 &user_base_data, &base_vector);
+	if (ret)
+		return ret;
+
+	ath12k_dbg(ab, ATH12K_DBG_PCI, "Number of assigned MSI for MHI is %d, base vector is %d\n",
+		   num_vectors, base_vector);
+
+	irq = kcalloc(num_vectors, sizeof(*irq), GFP_KERNEL);
+	if (!irq)
+		return -ENOMEM;
+
+	for (i = 0; i < num_vectors; i++)
+		irq[i] = ath12k_pci_get_msi_irq(ab->dev,
+						base_vector + i);
+
+	ab_pci->mhi_ctrl->irq = irq;
+	ab_pci->mhi_ctrl->nr_irqs = num_vectors;
+
+	return 0;
+}
+
+static int ath12k_mhi_op_runtime_get(struct mhi_controller *mhi_cntrl)
+{
+	return 0;
+}
+
+static void ath12k_mhi_op_runtime_put(struct mhi_controller *mhi_cntrl)
+{
+}
+
+static char *ath12k_mhi_op_callback_to_str(enum mhi_callback reason)
+{
+	switch (reason) {
+	case MHI_CB_IDLE:
+		return "MHI_CB_IDLE";
+	case MHI_CB_PENDING_DATA:
+		return "MHI_CB_PENDING_DATA";
+	case MHI_CB_LPM_ENTER:
+		return "MHI_CB_LPM_ENTER";
+	case MHI_CB_LPM_EXIT:
+		return "MHI_CB_LPM_EXIT";
+	case MHI_CB_EE_RDDM:
+		return "MHI_CB_EE_RDDM";
+	case MHI_CB_EE_MISSION_MODE:
+		return "MHI_CB_EE_MISSION_MODE";
+	case MHI_CB_SYS_ERROR:
+		return "MHI_CB_SYS_ERROR";
+	case MHI_CB_FATAL_ERROR:
+		return "MHI_CB_FATAL_ERROR";
+	case MHI_CB_BW_REQ:
+		return "MHI_CB_BW_REQ";
+	default:
+		return "UNKNOWN";
+	}
+}
+
+static void ath12k_mhi_op_status_cb(struct mhi_controller *mhi_cntrl,
+				    enum mhi_callback cb)
+{
+	struct ath12k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
+
+	ath12k_dbg(ab, ATH12K_DBG_BOOT, "mhi notify status reason %s\n",
+		   ath12k_mhi_op_callback_to_str(cb));
+
+	switch (cb) {
+	case MHI_CB_SYS_ERROR:
+		ath12k_warn(ab, "firmware crashed: MHI_CB_SYS_ERROR\n");
+		break;
+	case MHI_CB_EE_RDDM:
+		if (!(test_bit(ATH12K_FLAG_UNREGISTERING, &ab->dev_flags)))
+			queue_work(ab->workqueue_aux, &ab->reset_work);
+		break;
+	default:
+		break;
+	}
+}
+
+static int ath12k_mhi_op_read_reg(struct mhi_controller *mhi_cntrl,
+				  void __iomem *addr,
+				  u32 *out)
+{
+	*out = readl(addr);
+
+	return 0;
+}
+
+static void ath12k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
+				    void __iomem *addr,
+				    u32 val)
+{
+	writel(val, addr);
+}
+
+int ath12k_mhi_register(struct ath12k_pci *ab_pci)
+{
+	struct ath12k_base *ab = ab_pci->ab;
+	struct mhi_controller *mhi_ctrl;
+	int ret;
+
+	mhi_ctrl = mhi_alloc_controller();
+	if (!mhi_ctrl)
+		return -ENOMEM;
+
+	ath12k_core_create_firmware_path(ab, ATH12K_AMSS_FILE,
+					 ab_pci->amss_path,
+					 sizeof(ab_pci->amss_path));
+
+	ab_pci->mhi_ctrl = mhi_ctrl;
+	mhi_ctrl->cntrl_dev = ab->dev;
+	mhi_ctrl->fw_image = ab_pci->amss_path;
+	mhi_ctrl->regs = ab->mem;
+	mhi_ctrl->reg_len = ab->mem_len;
+
+	ret = ath12k_mhi_get_msi(ab_pci);
+	if (ret) {
+		ath12k_err(ab, "failed to get msi for mhi\n");
+		mhi_free_controller(mhi_ctrl);
+		return ret;
+	}
+
+	mhi_ctrl->iova_start = 0;
+	mhi_ctrl->iova_stop = 0xffffffff;
+	mhi_ctrl->sbl_size = SZ_512K;
+	mhi_ctrl->seg_len = SZ_512K;
+	mhi_ctrl->fbc_download = true;
+	mhi_ctrl->runtime_get = ath12k_mhi_op_runtime_get;
+	mhi_ctrl->runtime_put = ath12k_mhi_op_runtime_put;
+	mhi_ctrl->status_cb = ath12k_mhi_op_status_cb;
+	mhi_ctrl->read_reg = ath12k_mhi_op_read_reg;
+	mhi_ctrl->write_reg = ath12k_mhi_op_write_reg;
+
+	ret = mhi_register_controller(mhi_ctrl, ab->hw_params->mhi_config);
+	if (ret) {
+		ath12k_err(ab, "failed to register to mhi bus, err = %d\n", ret);
+		mhi_free_controller(mhi_ctrl);
+		return ret;
+	}
+
+	return 0;
+}
+
+void ath12k_mhi_unregister(struct ath12k_pci *ab_pci)
+{
+	struct mhi_controller *mhi_ctrl = ab_pci->mhi_ctrl;
+
+	mhi_unregister_controller(mhi_ctrl);
+	kfree(mhi_ctrl->irq);
+	mhi_free_controller(mhi_ctrl);
+	ab_pci->mhi_ctrl = NULL;
+}
+
+static char *ath12k_mhi_state_to_str(enum ath12k_mhi_state mhi_state)
+{
+	switch (mhi_state) {
+	case ATH12K_MHI_INIT:
+		return "INIT";
+	case ATH12K_MHI_DEINIT:
+		return "DEINIT";
+	case ATH12K_MHI_POWER_ON:
+		return "POWER_ON";
+	case ATH12K_MHI_POWER_OFF:
+		return "POWER_OFF";
+	case ATH12K_MHI_FORCE_POWER_OFF:
+		return "FORCE_POWER_OFF";
+	case ATH12K_MHI_SUSPEND:
+		return "SUSPEND";
+	case ATH12K_MHI_RESUME:
+		return "RESUME";
+	case ATH12K_MHI_TRIGGER_RDDM:
+		return "TRIGGER_RDDM";
+	case ATH12K_MHI_RDDM_DONE:
+		return "RDDM_DONE";
+	default:
+		return "UNKNOWN";
+	}
+};
+
+static void ath12k_mhi_set_state_bit(struct ath12k_pci *ab_pci,
+				     enum ath12k_mhi_state mhi_state)
+{
+	struct ath12k_base *ab = ab_pci->ab;
+
+	switch (mhi_state) {
+	case ATH12K_MHI_INIT:
+		set_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_DEINIT:
+		clear_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_POWER_ON:
+		set_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_POWER_OFF:
+	case ATH12K_MHI_FORCE_POWER_OFF:
+		clear_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state);
+		clear_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
+		clear_bit(ATH12K_MHI_RDDM_DONE, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_SUSPEND:
+		set_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_RESUME:
+		clear_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_TRIGGER_RDDM:
+		set_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
+		break;
+	case ATH12K_MHI_RDDM_DONE:
+		set_bit(ATH12K_MHI_RDDM_DONE, &ab_pci->mhi_state);
+		break;
+	default:
+		ath12k_err(ab, "unhandled mhi state (%d)\n", mhi_state);
+	}
+}
+
+static int ath12k_mhi_check_state_bit(struct ath12k_pci *ab_pci,
+				      enum ath12k_mhi_state mhi_state)
+{
+	struct ath12k_base *ab = ab_pci->ab;
+
+	switch (mhi_state) {
+	case ATH12K_MHI_INIT:
+		if (!test_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_DEINIT:
+	case ATH12K_MHI_POWER_ON:
+		if (test_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state) &&
+		    !test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_FORCE_POWER_OFF:
+		if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_POWER_OFF:
+	case ATH12K_MHI_SUSPEND:
+		if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state) &&
+		    !test_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_RESUME:
+		if (test_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_TRIGGER_RDDM:
+		if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state) &&
+		    !test_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state))
+			return 0;
+		break;
+	case ATH12K_MHI_RDDM_DONE:
+		return 0;
+	default:
+		ath12k_err(ab, "unhandled mhi state: %s(%d)\n",
+			   ath12k_mhi_state_to_str(mhi_state), mhi_state);
+	}
+
+	ath12k_err(ab, "failed to set mhi state %s(%d) in current mhi state (0x%lx)\n",
+		   ath12k_mhi_state_to_str(mhi_state), mhi_state,
+		   ab_pci->mhi_state);
+
+	return -EINVAL;
+}
+
+static int ath12k_mhi_set_state(struct ath12k_pci *ab_pci,
+				enum ath12k_mhi_state mhi_state)
+{
+	struct ath12k_base *ab = ab_pci->ab;
+	int ret;
+
+	ret = ath12k_mhi_check_state_bit(ab_pci, mhi_state);
+	if (ret)
+		goto out;
+
+	ath12k_dbg(ab, ATH12K_DBG_PCI, "setting mhi state: %s(%d)\n",
+		   ath12k_mhi_state_to_str(mhi_state), mhi_state);
+
+	switch (mhi_state) {
+	case ATH12K_MHI_INIT:
+		ret = mhi_prepare_for_power_up(ab_pci->mhi_ctrl);
+		break;
+	case ATH12K_MHI_DEINIT:
+		mhi_unprepare_after_power_down(ab_pci->mhi_ctrl);
+		ret = 0;
+		break;
+	case ATH12K_MHI_POWER_ON:
+		ret = mhi_async_power_up(ab_pci->mhi_ctrl);
+		break;
+	case ATH12K_MHI_POWER_OFF:
+		mhi_power_down(ab_pci->mhi_ctrl, true);
+		ret = 0;
+		break;
+	case ATH12K_MHI_FORCE_POWER_OFF:
+		mhi_power_down(ab_pci->mhi_ctrl, false);
+		ret = 0;
+		break;
+	case ATH12K_MHI_SUSPEND:
+		ret = mhi_pm_suspend(ab_pci->mhi_ctrl);
+		break;
+	case ATH12K_MHI_RESUME:
+		ret = mhi_pm_resume(ab_pci->mhi_ctrl);
+		break;
+	case ATH12K_MHI_TRIGGER_RDDM:
+		ret = mhi_force_rddm_mode(ab_pci->mhi_ctrl);
+		break;
+	case ATH12K_MHI_RDDM_DONE:
+		break;
+	default:
+		ath12k_err(ab, "unhandled MHI state (%d)\n", mhi_state);
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		goto out;
+
+	ath12k_mhi_set_state_bit(ab_pci, mhi_state);
+
+	return 0;
+
+out:
+	ath12k_err(ab, "failed to set mhi state: %s(%d)\n",
+		   ath12k_mhi_state_to_str(mhi_state), mhi_state);
+	return ret;
+}
+
+int ath12k_mhi_start(struct ath12k_pci *ab_pci)
+{
+	int ret;
+
+	ab_pci->mhi_ctrl->timeout_ms = MHI_TIMEOUT_DEFAULT_MS;
+
+	ret = ath12k_mhi_set_state(ab_pci, ATH12K_MHI_INIT);
+	if (ret)
+		goto out;
+
+	ret = ath12k_mhi_set_state(ab_pci, ATH12K_MHI_POWER_ON);
+	if (ret)
+		goto out;
+
+	return 0;
+
+out:
+	return ret;
+}
+
+void ath12k_mhi_stop(struct ath12k_pci *ab_pci)
+{
+	ath12k_mhi_set_state(ab_pci, ATH12K_MHI_POWER_OFF);
+	ath12k_mhi_set_state(ab_pci, ATH12K_MHI_DEINIT);
+}
+
+void ath12k_mhi_suspend(struct ath12k_pci *ab_pci)
+{
+	ath12k_mhi_set_state(ab_pci, ATH12K_MHI_SUSPEND);
+}
+
+void ath12k_mhi_resume(struct ath12k_pci *ab_pci)
+{
+	ath12k_mhi_set_state(ab_pci, ATH12K_MHI_RESUME);
+}