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, 777 insertions, 0 deletions

diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c
new file mode 100644
index 000000000..343c58ed5
--- /dev/null
+++ b/drivers/soc/ti/wkup_m3_ipc.c
@@ -0,0 +1,777 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMx3 Wkup M3 IPC driver
+ *
+ * Copyright (C) 2015 Texas Instruments, Inc.
+ *
+ * Dave Gerlach <d-gerlach@ti.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/omap-mailbox.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/suspend.h>
+#include <linux/wkup_m3_ipc.h>
+
+#define AM33XX_CTRL_IPC_REG_COUNT	0x8
+#define AM33XX_CTRL_IPC_REG_OFFSET(m)	(0x4 + 4 * (m))
+
+/* AM33XX M3_TXEV_EOI register */
+#define AM33XX_CONTROL_M3_TXEV_EOI	0x00
+
+#define AM33XX_M3_TXEV_ACK		(0x1 << 0)
+#define AM33XX_M3_TXEV_ENABLE		(0x0 << 0)
+
+#define IPC_CMD_DS0			0x4
+#define IPC_CMD_STANDBY			0xc
+#define IPC_CMD_IDLE			0x10
+#define IPC_CMD_RESET			0xe
+#define DS_IPC_DEFAULT			0xffffffff
+#define M3_VERSION_UNKNOWN		0x0000ffff
+#define M3_BASELINE_VERSION		0x191
+#define M3_STATUS_RESP_MASK		(0xffff << 16)
+#define M3_FW_VERSION_MASK		0xffff
+#define M3_WAKE_SRC_MASK		0xff
+
+#define IPC_MEM_TYPE_SHIFT		(0x0)
+#define IPC_MEM_TYPE_MASK		(0x7 << 0)
+#define IPC_VTT_STAT_SHIFT		(0x3)
+#define IPC_VTT_STAT_MASK		(0x1 << 3)
+#define IPC_VTT_GPIO_PIN_SHIFT		(0x4)
+#define IPC_VTT_GPIO_PIN_MASK		(0x3f << 4)
+#define IPC_IO_ISOLATION_STAT_SHIFT	(10)
+#define IPC_IO_ISOLATION_STAT_MASK	(0x1 << 10)
+
+#define IPC_DBG_HALT_SHIFT		(11)
+#define IPC_DBG_HALT_MASK		(0x1 << 11)
+
+#define M3_STATE_UNKNOWN		0
+#define M3_STATE_RESET			1
+#define M3_STATE_INITED			2
+#define M3_STATE_MSG_FOR_LP		3
+#define M3_STATE_MSG_FOR_RESET		4
+
+#define WKUP_M3_SD_FW_MAGIC		0x570C
+
+#define WKUP_M3_DMEM_START		0x80000
+#define WKUP_M3_AUXDATA_OFFSET		0x1000
+#define WKUP_M3_AUXDATA_SIZE		0xFF
+
+static struct wkup_m3_ipc *m3_ipc_state;
+
+static const struct wkup_m3_wakeup_src wakeups[] = {
+	{.irq_nr = 16,	.src = "PRCM"},
+	{.irq_nr = 35,	.src = "USB0_PHY"},
+	{.irq_nr = 36,	.src = "USB1_PHY"},
+	{.irq_nr = 40,	.src = "I2C0"},
+	{.irq_nr = 41,	.src = "RTC Timer"},
+	{.irq_nr = 42,	.src = "RTC Alarm"},
+	{.irq_nr = 43,	.src = "Timer0"},
+	{.irq_nr = 44,	.src = "Timer1"},
+	{.irq_nr = 45,	.src = "UART"},
+	{.irq_nr = 46,	.src = "GPIO0"},
+	{.irq_nr = 48,	.src = "MPU_WAKE"},
+	{.irq_nr = 49,	.src = "WDT0"},
+	{.irq_nr = 50,	.src = "WDT1"},
+	{.irq_nr = 51,	.src = "ADC_TSC"},
+	{.irq_nr = 0,	.src = "Unknown"},
+};
+
+/**
+ * wkup_m3_copy_aux_data - Copy auxiliary data to special region of m3 dmem
+ * @data - pointer to data
+ * @sz - size of data to copy (limit 256 bytes)
+ *
+ * Copies any additional blob of data to the wkup_m3 dmem to be used by the
+ * firmware
+ */
+static unsigned long wkup_m3_copy_aux_data(struct wkup_m3_ipc *m3_ipc,
+					   const void *data, int sz)
+{
+	unsigned long aux_data_dev_addr;
+	void *aux_data_addr;
+
+	aux_data_dev_addr = WKUP_M3_DMEM_START + WKUP_M3_AUXDATA_OFFSET;
+	aux_data_addr = rproc_da_to_va(m3_ipc->rproc,
+				       aux_data_dev_addr,
+				       WKUP_M3_AUXDATA_SIZE,
+				       NULL);
+	memcpy(aux_data_addr, data, sz);
+
+	return WKUP_M3_AUXDATA_OFFSET;
+}
+
+static void wkup_m3_scale_data_fw_cb(const struct firmware *fw, void *context)
+{
+	unsigned long val, aux_base;
+	struct wkup_m3_scale_data_header hdr;
+	struct wkup_m3_ipc *m3_ipc = context;
+	struct device *dev = m3_ipc->dev;
+
+	if (!fw) {
+		dev_err(dev, "Voltage scale fw name given but file missing.\n");
+		return;
+	}
+
+	memcpy(&hdr, fw->data, sizeof(hdr));
+
+	if (hdr.magic != WKUP_M3_SD_FW_MAGIC) {
+		dev_err(dev, "PM: Voltage Scale Data binary does not appear valid.\n");
+		goto release_sd_fw;
+	}
+
+	aux_base = wkup_m3_copy_aux_data(m3_ipc, fw->data + sizeof(hdr),
+					 fw->size - sizeof(hdr));
+
+	val = (aux_base + hdr.sleep_offset);
+	val |= ((aux_base + hdr.wake_offset) << 16);
+
+	m3_ipc->volt_scale_offsets = val;
+
+release_sd_fw:
+	release_firmware(fw);
+};
+
+static int wkup_m3_init_scale_data(struct wkup_m3_ipc *m3_ipc,
+				   struct device *dev)
+{
+	int ret = 0;
+
+	/*
+	 * If no name is provided, user has already been warned, pm will
+	 * still work so return 0
+	 */
+
+	if (!m3_ipc->sd_fw_name)
+		return ret;
+
+	ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT,
+				      m3_ipc->sd_fw_name, dev, GFP_ATOMIC,
+				      m3_ipc, wkup_m3_scale_data_fw_cb);
+
+	return ret;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void wkup_m3_set_halt_late(bool enabled)
+{
+	if (enabled)
+		m3_ipc_state->halt = (1 << IPC_DBG_HALT_SHIFT);
+	else
+		m3_ipc_state->halt = 0;
+}
+
+static int option_get(void *data, u64 *val)
+{
+	u32 *option = data;
+
+	*val = *option;
+
+	return 0;
+}
+
+static int option_set(void *data, u64 val)
+{
+	u32 *option = data;
+
+	*option = val;
+
+	if (option == &m3_ipc_state->halt) {
+		if (val)
+			wkup_m3_set_halt_late(true);
+		else
+			wkup_m3_set_halt_late(false);
+	}
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(wkup_m3_ipc_option_fops, option_get, option_set,
+			"%llu\n");
+
+static int wkup_m3_ipc_dbg_init(struct wkup_m3_ipc *m3_ipc)
+{
+	m3_ipc->dbg_path = debugfs_create_dir("wkup_m3_ipc", NULL);
+
+	if (!m3_ipc->dbg_path)
+		return -EINVAL;
+
+	(void)debugfs_create_file("enable_late_halt", 0644,
+				  m3_ipc->dbg_path,
+				  &m3_ipc->halt,
+				  &wkup_m3_ipc_option_fops);
+
+	return 0;
+}
+
+static inline void wkup_m3_ipc_dbg_destroy(struct wkup_m3_ipc *m3_ipc)
+{
+	debugfs_remove_recursive(m3_ipc->dbg_path);
+}
+#else
+static inline int wkup_m3_ipc_dbg_init(struct wkup_m3_ipc *m3_ipc)
+{
+	return 0;
+}
+
+static inline void wkup_m3_ipc_dbg_destroy(struct wkup_m3_ipc *m3_ipc)
+{
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static void am33xx_txev_eoi(struct wkup_m3_ipc *m3_ipc)
+{
+	writel(AM33XX_M3_TXEV_ACK,
+	       m3_ipc->ipc_mem_base + AM33XX_CONTROL_M3_TXEV_EOI);
+}
+
+static void am33xx_txev_enable(struct wkup_m3_ipc *m3_ipc)
+{
+	writel(AM33XX_M3_TXEV_ENABLE,
+	       m3_ipc->ipc_mem_base + AM33XX_CONTROL_M3_TXEV_EOI);
+}
+
+static void wkup_m3_ctrl_ipc_write(struct wkup_m3_ipc *m3_ipc,
+				   u32 val, int ipc_reg_num)
+{
+	if (WARN(ipc_reg_num < 0 || ipc_reg_num > AM33XX_CTRL_IPC_REG_COUNT,
+		 "ipc register operation out of range"))
+		return;
+
+	writel(val, m3_ipc->ipc_mem_base +
+	       AM33XX_CTRL_IPC_REG_OFFSET(ipc_reg_num));
+}
+
+static unsigned int wkup_m3_ctrl_ipc_read(struct wkup_m3_ipc *m3_ipc,
+					  int ipc_reg_num)
+{
+	if (WARN(ipc_reg_num < 0 || ipc_reg_num > AM33XX_CTRL_IPC_REG_COUNT,
+		 "ipc register operation out of range"))
+		return 0;
+
+	return readl(m3_ipc->ipc_mem_base +
+		     AM33XX_CTRL_IPC_REG_OFFSET(ipc_reg_num));
+}
+
+static int wkup_m3_fw_version_read(struct wkup_m3_ipc *m3_ipc)
+{
+	int val;
+
+	val = wkup_m3_ctrl_ipc_read(m3_ipc, 2);
+
+	return val & M3_FW_VERSION_MASK;
+}
+
+static irqreturn_t wkup_m3_txev_handler(int irq, void *ipc_data)
+{
+	struct wkup_m3_ipc *m3_ipc = ipc_data;
+	struct device *dev = m3_ipc->dev;
+	int ver = 0;
+
+	am33xx_txev_eoi(m3_ipc);
+
+	switch (m3_ipc->state) {
+	case M3_STATE_RESET:
+		ver = wkup_m3_fw_version_read(m3_ipc);
+
+		if (ver == M3_VERSION_UNKNOWN ||
+		    ver < M3_BASELINE_VERSION) {
+			dev_warn(dev, "CM3 Firmware Version %x not supported\n",
+				 ver);
+		} else {
+			dev_info(dev, "CM3 Firmware Version = 0x%x\n", ver);
+		}
+
+		m3_ipc->state = M3_STATE_INITED;
+		wkup_m3_init_scale_data(m3_ipc, dev);
+		complete(&m3_ipc->sync_complete);
+		break;
+	case M3_STATE_MSG_FOR_RESET:
+		m3_ipc->state = M3_STATE_INITED;
+		complete(&m3_ipc->sync_complete);
+		break;
+	case M3_STATE_MSG_FOR_LP:
+		complete(&m3_ipc->sync_complete);
+		break;
+	case M3_STATE_UNKNOWN:
+		dev_warn(dev, "Unknown CM3 State\n");
+	}
+
+	am33xx_txev_enable(m3_ipc);
+
+	return IRQ_HANDLED;
+}
+
+static int wkup_m3_ping(struct wkup_m3_ipc *m3_ipc)
+{
+	struct device *dev = m3_ipc->dev;
+	mbox_msg_t dummy_msg = 0;
+	int ret;
+
+	if (!m3_ipc->mbox) {
+		dev_err(dev,
+			"No IPC channel to communicate with wkup_m3!\n");
+		return -EIO;
+	}
+
+	/*
+	 * Write a dummy message to the mailbox in order to trigger the RX
+	 * interrupt to alert the M3 that data is available in the IPC
+	 * registers. We must enable the IRQ here and disable it after in
+	 * the RX callback to avoid multiple interrupts being received
+	 * by the CM3.
+	 */
+	ret = mbox_send_message(m3_ipc->mbox, &dummy_msg);
+	if (ret < 0) {
+		dev_err(dev, "%s: mbox_send_message() failed: %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	ret = wait_for_completion_timeout(&m3_ipc->sync_complete,
+					  msecs_to_jiffies(500));
+	if (!ret) {
+		dev_err(dev, "MPU<->CM3 sync failure\n");
+		m3_ipc->state = M3_STATE_UNKNOWN;
+		return -EIO;
+	}
+
+	mbox_client_txdone(m3_ipc->mbox, 0);
+	return 0;
+}
+
+static int wkup_m3_ping_noirq(struct wkup_m3_ipc *m3_ipc)
+{
+	struct device *dev = m3_ipc->dev;
+	mbox_msg_t dummy_msg = 0;
+	int ret;
+
+	if (!m3_ipc->mbox) {
+		dev_err(dev,
+			"No IPC channel to communicate with wkup_m3!\n");
+		return -EIO;
+	}
+
+	ret = mbox_send_message(m3_ipc->mbox, &dummy_msg);
+	if (ret < 0) {
+		dev_err(dev, "%s: mbox_send_message() failed: %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	mbox_client_txdone(m3_ipc->mbox, 0);
+	return 0;
+}
+
+static int wkup_m3_is_available(struct wkup_m3_ipc *m3_ipc)
+{
+	return ((m3_ipc->state != M3_STATE_RESET) &&
+		(m3_ipc->state != M3_STATE_UNKNOWN));
+}
+
+static void wkup_m3_set_vtt_gpio(struct wkup_m3_ipc *m3_ipc, int gpio)
+{
+	m3_ipc->vtt_conf = (1 << IPC_VTT_STAT_SHIFT) |
+			    (gpio << IPC_VTT_GPIO_PIN_SHIFT);
+}
+
+static void wkup_m3_set_io_isolation(struct wkup_m3_ipc *m3_ipc)
+{
+	m3_ipc->isolation_conf = (1 << IPC_IO_ISOLATION_STAT_SHIFT);
+}
+
+/* Public functions */
+/**
+ * wkup_m3_set_mem_type - Pass wkup_m3 which type of memory is in use
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ * @mem_type: memory type value read directly from emif
+ *
+ * wkup_m3 must know what memory type is in use to properly suspend
+ * and resume.
+ */
+static void wkup_m3_set_mem_type(struct wkup_m3_ipc *m3_ipc, int mem_type)
+{
+	m3_ipc->mem_type = mem_type;
+}
+
+/**
+ * wkup_m3_set_resume_address - Pass wkup_m3 resume address
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ * @addr: Physical address from which resume code should execute
+ */
+static void wkup_m3_set_resume_address(struct wkup_m3_ipc *m3_ipc, void *addr)
+{
+	m3_ipc->resume_addr = (unsigned long)addr;
+}
+
+/**
+ * wkup_m3_request_pm_status - Retrieve wkup_m3 status code after suspend
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ *
+ * Returns code representing the status of a low power mode transition.
+ *	0 - Successful transition
+ *	1 - Failure to transition to low power state
+ */
+static int wkup_m3_request_pm_status(struct wkup_m3_ipc *m3_ipc)
+{
+	unsigned int i;
+	int val;
+
+	val = wkup_m3_ctrl_ipc_read(m3_ipc, 1);
+
+	i = M3_STATUS_RESP_MASK & val;
+	i >>= __ffs(M3_STATUS_RESP_MASK);
+
+	return i;
+}
+
+/**
+ * wkup_m3_prepare_low_power - Request preparation for transition to
+ *			       low power state
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ * @state: A kernel suspend state to enter, either MEM or STANDBY
+ *
+ * Returns 0 if preparation was successful, otherwise returns error code
+ */
+static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state)
+{
+	struct device *dev = m3_ipc->dev;
+	int m3_power_state;
+	int ret = 0;
+
+	if (!wkup_m3_is_available(m3_ipc))
+		return -ENODEV;
+
+	switch (state) {
+	case WKUP_M3_DEEPSLEEP:
+		m3_power_state = IPC_CMD_DS0;
+		wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->volt_scale_offsets, 5);
+		break;
+	case WKUP_M3_STANDBY:
+		m3_power_state = IPC_CMD_STANDBY;
+		wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5);
+		break;
+	case WKUP_M3_IDLE:
+		m3_power_state = IPC_CMD_IDLE;
+		wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5);
+		break;
+	default:
+		return 1;
+	}
+
+	/* Program each required IPC register then write defaults to others */
+	wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->resume_addr, 0);
+	wkup_m3_ctrl_ipc_write(m3_ipc, m3_power_state, 1);
+	wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->mem_type |
+			       m3_ipc->vtt_conf |
+			       m3_ipc->isolation_conf |
+			       m3_ipc->halt, 4);
+
+	wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2);
+	wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 3);
+	wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 6);
+	wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 7);
+
+	m3_ipc->state = M3_STATE_MSG_FOR_LP;
+
+	if (state == WKUP_M3_IDLE)
+		ret = wkup_m3_ping_noirq(m3_ipc);
+	else
+		ret = wkup_m3_ping(m3_ipc);
+
+	if (ret) {
+		dev_err(dev, "Unable to ping CM3\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * wkup_m3_finish_low_power - Return m3 to reset state
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ *
+ * Returns 0 if reset was successful, otherwise returns error code
+ */
+static int wkup_m3_finish_low_power(struct wkup_m3_ipc *m3_ipc)
+{
+	struct device *dev = m3_ipc->dev;
+	int ret = 0;
+
+	if (!wkup_m3_is_available(m3_ipc))
+		return -ENODEV;
+
+	wkup_m3_ctrl_ipc_write(m3_ipc, IPC_CMD_RESET, 1);
+	wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2);
+
+	m3_ipc->state = M3_STATE_MSG_FOR_RESET;
+
+	ret = wkup_m3_ping(m3_ipc);
+	if (ret) {
+		dev_err(dev, "Unable to ping CM3\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * wkup_m3_request_wake_src - Get the wakeup source info passed from wkup_m3
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ */
+static const char *wkup_m3_request_wake_src(struct wkup_m3_ipc *m3_ipc)
+{
+	unsigned int wakeup_src_idx;
+	int j, val;
+
+	val = wkup_m3_ctrl_ipc_read(m3_ipc, 6);
+
+	wakeup_src_idx = val & M3_WAKE_SRC_MASK;
+
+	for (j = 0; j < ARRAY_SIZE(wakeups) - 1; j++) {
+		if (wakeups[j].irq_nr == wakeup_src_idx)
+			return wakeups[j].src;
+	}
+	return wakeups[j].src;
+}
+
+/**
+ * wkup_m3_set_rtc_only - Set the rtc_only flag
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ */
+static void wkup_m3_set_rtc_only(struct wkup_m3_ipc *m3_ipc)
+{
+	if (m3_ipc_state)
+		m3_ipc_state->is_rtc_only = true;
+}
+
+static struct wkup_m3_ipc_ops ipc_ops = {
+	.set_mem_type = wkup_m3_set_mem_type,
+	.set_resume_address = wkup_m3_set_resume_address,
+	.prepare_low_power = wkup_m3_prepare_low_power,
+	.finish_low_power = wkup_m3_finish_low_power,
+	.request_pm_status = wkup_m3_request_pm_status,
+	.request_wake_src = wkup_m3_request_wake_src,
+	.set_rtc_only = wkup_m3_set_rtc_only,
+};
+
+/**
+ * wkup_m3_ipc_get - Return handle to wkup_m3_ipc
+ *
+ * Returns NULL if the wkup_m3 is not yet available, otherwise returns
+ * pointer to wkup_m3_ipc struct.
+ */
+struct wkup_m3_ipc *wkup_m3_ipc_get(void)
+{
+	if (m3_ipc_state)
+		get_device(m3_ipc_state->dev);
+	else
+		return NULL;
+
+	return m3_ipc_state;
+}
+EXPORT_SYMBOL_GPL(wkup_m3_ipc_get);
+
+/**
+ * wkup_m3_ipc_put - Free handle to wkup_m3_ipc returned from wkup_m3_ipc_get
+ * @m3_ipc: A pointer to wkup_m3_ipc struct returned by wkup_m3_ipc_get
+ */
+void wkup_m3_ipc_put(struct wkup_m3_ipc *m3_ipc)
+{
+	if (m3_ipc_state)
+		put_device(m3_ipc_state->dev);
+}
+EXPORT_SYMBOL_GPL(wkup_m3_ipc_put);
+
+static int wkup_m3_rproc_boot_thread(void *arg)
+{
+	struct wkup_m3_ipc *m3_ipc = arg;
+	struct device *dev = m3_ipc->dev;
+	int ret;
+
+	init_completion(&m3_ipc->sync_complete);
+
+	ret = rproc_boot(m3_ipc->rproc);
+	if (ret)
+		dev_err(dev, "rproc_boot failed\n");
+	else
+		m3_ipc_state = m3_ipc;
+
+	return 0;
+}
+
+static int wkup_m3_ipc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int irq, ret, temp;
+	phandle rproc_phandle;
+	struct rproc *m3_rproc;
+	struct resource *res;
+	struct task_struct *task;
+	struct wkup_m3_ipc *m3_ipc;
+	struct device_node *np = dev->of_node;
+
+	m3_ipc = devm_kzalloc(dev, sizeof(*m3_ipc), GFP_KERNEL);
+	if (!m3_ipc)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	m3_ipc->ipc_mem_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(m3_ipc->ipc_mem_base))
+		return PTR_ERR(m3_ipc->ipc_mem_base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(dev, irq, wkup_m3_txev_handler,
+			       0, "wkup_m3_txev", m3_ipc);
+	if (ret) {
+		dev_err(dev, "request_irq failed\n");
+		return ret;
+	}
+
+	m3_ipc->mbox_client.dev = dev;
+	m3_ipc->mbox_client.tx_done = NULL;
+	m3_ipc->mbox_client.tx_prepare = NULL;
+	m3_ipc->mbox_client.rx_callback = NULL;
+	m3_ipc->mbox_client.tx_block = false;
+	m3_ipc->mbox_client.knows_txdone = false;
+
+	m3_ipc->mbox = mbox_request_channel(&m3_ipc->mbox_client, 0);
+
+	if (IS_ERR(m3_ipc->mbox)) {
+		dev_err(dev, "IPC Request for A8->M3 Channel failed! %ld\n",
+			PTR_ERR(m3_ipc->mbox));
+		return PTR_ERR(m3_ipc->mbox);
+	}
+
+	if (of_property_read_u32(dev->of_node, "ti,rproc", &rproc_phandle)) {
+		dev_err(&pdev->dev, "could not get rproc phandle\n");
+		ret = -ENODEV;
+		goto err_free_mbox;
+	}
+
+	m3_rproc = rproc_get_by_phandle(rproc_phandle);
+	if (!m3_rproc) {
+		dev_err(&pdev->dev, "could not get rproc handle\n");
+		ret = -EPROBE_DEFER;
+		goto err_free_mbox;
+	}
+
+	m3_ipc->rproc = m3_rproc;
+	m3_ipc->dev = dev;
+	m3_ipc->state = M3_STATE_RESET;
+
+	m3_ipc->ops = &ipc_ops;
+
+	if (!of_property_read_u32(np, "ti,vtt-gpio-pin", &temp)) {
+		if (temp >= 0 && temp <= 31)
+			wkup_m3_set_vtt_gpio(m3_ipc, temp);
+		else
+			dev_warn(dev, "Invalid VTT GPIO(%d) pin\n", temp);
+	}
+
+	if (of_find_property(np, "ti,set-io-isolation", NULL))
+		wkup_m3_set_io_isolation(m3_ipc);
+
+	ret = of_property_read_string(np, "firmware-name",
+				      &m3_ipc->sd_fw_name);
+	if (ret) {
+		dev_dbg(dev, "Voltage scaling data blob not provided from DT.\n");
+	}
+
+	/*
+	 * Wait for firmware loading completion in a thread so we
+	 * can boot the wkup_m3 as soon as it's ready without holding
+	 * up kernel boot
+	 */
+	task = kthread_run(wkup_m3_rproc_boot_thread, m3_ipc,
+			   "wkup_m3_rproc_loader");
+
+	if (IS_ERR(task)) {
+		dev_err(dev, "can't create rproc_boot thread\n");
+		ret = PTR_ERR(task);
+		goto err_put_rproc;
+	}
+
+	wkup_m3_ipc_dbg_init(m3_ipc);
+
+	return 0;
+
+err_put_rproc:
+	rproc_put(m3_rproc);
+err_free_mbox:
+	mbox_free_channel(m3_ipc->mbox);
+	return ret;
+}
+
+static int wkup_m3_ipc_remove(struct platform_device *pdev)
+{
+	wkup_m3_ipc_dbg_destroy(m3_ipc_state);
+
+	mbox_free_channel(m3_ipc_state->mbox);
+
+	rproc_shutdown(m3_ipc_state->rproc);
+	rproc_put(m3_ipc_state->rproc);
+
+	m3_ipc_state = NULL;
+
+	return 0;
+}
+
+static int __maybe_unused wkup_m3_ipc_suspend(struct device *dev)
+{
+	/*
+	 * Nothing needs to be done on suspend even with rtc_only flag set
+	 */
+	return 0;
+}
+
+static int __maybe_unused wkup_m3_ipc_resume(struct device *dev)
+{
+	if (m3_ipc_state->is_rtc_only) {
+		rproc_shutdown(m3_ipc_state->rproc);
+		rproc_boot(m3_ipc_state->rproc);
+	}
+
+	m3_ipc_state->is_rtc_only = false;
+
+	return 0;
+}
+
+static const struct dev_pm_ops wkup_m3_ipc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(wkup_m3_ipc_suspend, wkup_m3_ipc_resume)
+};
+
+static const struct of_device_id wkup_m3_ipc_of_match[] = {
+	{ .compatible = "ti,am3352-wkup-m3-ipc", },
+	{ .compatible = "ti,am4372-wkup-m3-ipc", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, wkup_m3_ipc_of_match);
+
+static struct platform_driver wkup_m3_ipc_driver = {
+	.probe = wkup_m3_ipc_probe,
+	.remove = wkup_m3_ipc_remove,
+	.driver = {
+		.name = "wkup_m3_ipc",
+		.of_match_table = wkup_m3_ipc_of_match,
+		.pm = &wkup_m3_ipc_pm_ops,
+	},
+};
+
+module_platform_driver(wkup_m3_ipc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("wkup m3 remote processor ipc driver");
+MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");