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, 498 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-altera.c b/drivers/i2c/busses/i2c-altera.c
new file mode 100644
index 000000000..50e7f3f67
--- /dev/null
+++ b/drivers/i2c/busses/i2c-altera.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright Intel Corporation (C) 2017.
+ *
+ * Based on the i2c-axxia.c driver.
+ */
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/iopoll.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#define ALTR_I2C_TFR_CMD	0x00	/* Transfer Command register */
+#define     ALTR_I2C_TFR_CMD_STA	BIT(9)	/* send START before byte */
+#define     ALTR_I2C_TFR_CMD_STO	BIT(8)	/* send STOP after byte */
+#define     ALTR_I2C_TFR_CMD_RW_D	BIT(0)	/* Direction of transfer */
+#define ALTR_I2C_RX_DATA	0x04	/* RX data FIFO register */
+#define ALTR_I2C_CTRL		0x08	/* Control register */
+#define     ALTR_I2C_CTRL_RXT_SHFT	4	/* RX FIFO Threshold */
+#define     ALTR_I2C_CTRL_TCT_SHFT	2	/* TFER CMD FIFO Threshold */
+#define     ALTR_I2C_CTRL_BSPEED	BIT(1)	/* Bus Speed (1=Fast) */
+#define     ALTR_I2C_CTRL_EN	BIT(0)	/* Enable Core (1=Enable) */
+#define ALTR_I2C_ISER		0x0C	/* Interrupt Status Enable register */
+#define     ALTR_I2C_ISER_RXOF_EN	BIT(4)	/* Enable RX OVERFLOW IRQ */
+#define     ALTR_I2C_ISER_ARB_EN	BIT(3)	/* Enable ARB LOST IRQ */
+#define     ALTR_I2C_ISER_NACK_EN	BIT(2)	/* Enable NACK DET IRQ */
+#define     ALTR_I2C_ISER_RXRDY_EN	BIT(1)	/* Enable RX Ready IRQ */
+#define     ALTR_I2C_ISER_TXRDY_EN	BIT(0)	/* Enable TX Ready IRQ */
+#define ALTR_I2C_ISR		0x10	/* Interrupt Status register */
+#define     ALTR_I2C_ISR_RXOF		BIT(4)	/* RX OVERFLOW IRQ */
+#define     ALTR_I2C_ISR_ARB		BIT(3)	/* ARB LOST IRQ */
+#define     ALTR_I2C_ISR_NACK		BIT(2)	/* NACK DET IRQ */
+#define     ALTR_I2C_ISR_RXRDY		BIT(1)	/* RX Ready IRQ */
+#define     ALTR_I2C_ISR_TXRDY		BIT(0)	/* TX Ready IRQ */
+#define ALTR_I2C_STATUS		0x14	/* Status register */
+#define     ALTR_I2C_STAT_CORE		BIT(0)	/* Core Status (0=idle) */
+#define ALTR_I2C_TC_FIFO_LVL	0x18	/* Transfer FIFO LVL register */
+#define ALTR_I2C_RX_FIFO_LVL	0x1C	/* Receive FIFO LVL register */
+#define ALTR_I2C_SCL_LOW	0x20	/* SCL low count register */
+#define ALTR_I2C_SCL_HIGH	0x24	/* SCL high count register */
+#define ALTR_I2C_SDA_HOLD	0x28	/* SDA hold count register */
+
+#define ALTR_I2C_ALL_IRQ	(ALTR_I2C_ISR_RXOF | ALTR_I2C_ISR_ARB | \
+				 ALTR_I2C_ISR_NACK | ALTR_I2C_ISR_RXRDY | \
+				 ALTR_I2C_ISR_TXRDY)
+
+#define ALTR_I2C_THRESHOLD	0	/* IRQ Threshold at 1 element */
+#define ALTR_I2C_DFLT_FIFO_SZ	4
+#define ALTR_I2C_TIMEOUT	100000	/* 100ms */
+#define ALTR_I2C_XFER_TIMEOUT	(msecs_to_jiffies(250))
+
+/**
+ * struct altr_i2c_dev - I2C device context
+ * @base: pointer to register struct
+ * @msg: pointer to current message
+ * @msg_len: number of bytes transferred in msg
+ * @msg_err: error code for completed message
+ * @msg_complete: xfer completion object
+ * @dev: device reference
+ * @adapter: core i2c abstraction
+ * @i2c_clk: clock reference for i2c input clock
+ * @bus_clk_rate: current i2c bus clock rate
+ * @buf: ptr to msg buffer for easier use.
+ * @fifo_size: size of the FIFO passed in.
+ * @isr_mask: cached copy of local ISR enables.
+ * @isr_status: cached copy of local ISR status.
+ * @isr_mutex: mutex for IRQ thread.
+ */
+struct altr_i2c_dev {
+	void __iomem *base;
+	struct i2c_msg *msg;
+	size_t msg_len;
+	int msg_err;
+	struct completion msg_complete;
+	struct device *dev;
+	struct i2c_adapter adapter;
+	struct clk *i2c_clk;
+	u32 bus_clk_rate;
+	u8 *buf;
+	u32 fifo_size;
+	u32 isr_mask;
+	u32 isr_status;
+	struct mutex isr_mutex;
+};
+
+static void
+altr_i2c_int_enable(struct altr_i2c_dev *idev, u32 mask, bool enable)
+{
+	u32 int_en;
+
+	int_en = readl(idev->base + ALTR_I2C_ISER);
+	if (enable)
+		idev->isr_mask = int_en | mask;
+	else
+		idev->isr_mask = int_en & ~mask;
+
+	writel(idev->isr_mask, idev->base + ALTR_I2C_ISER);
+}
+
+static void altr_i2c_int_clear(struct altr_i2c_dev *idev, u32 mask)
+{
+	u32 int_en = readl(idev->base + ALTR_I2C_ISR);
+
+	writel(int_en | mask, idev->base + ALTR_I2C_ISR);
+}
+
+static void altr_i2c_core_disable(struct altr_i2c_dev *idev)
+{
+	u32 tmp = readl(idev->base + ALTR_I2C_CTRL);
+
+	writel(tmp & ~ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL);
+}
+
+static void altr_i2c_core_enable(struct altr_i2c_dev *idev)
+{
+	u32 tmp = readl(idev->base + ALTR_I2C_CTRL);
+
+	writel(tmp | ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL);
+}
+
+static void altr_i2c_reset(struct altr_i2c_dev *idev)
+{
+	altr_i2c_core_disable(idev);
+	altr_i2c_core_enable(idev);
+}
+
+static inline void altr_i2c_stop(struct altr_i2c_dev *idev)
+{
+	writel(ALTR_I2C_TFR_CMD_STO, idev->base + ALTR_I2C_TFR_CMD);
+}
+
+static void altr_i2c_init(struct altr_i2c_dev *idev)
+{
+	u32 divisor = clk_get_rate(idev->i2c_clk) / idev->bus_clk_rate;
+	u32 clk_mhz = clk_get_rate(idev->i2c_clk) / 1000000;
+	u32 tmp = (ALTR_I2C_THRESHOLD << ALTR_I2C_CTRL_RXT_SHFT) |
+		  (ALTR_I2C_THRESHOLD << ALTR_I2C_CTRL_TCT_SHFT);
+	u32 t_high, t_low;
+
+	if (idev->bus_clk_rate <= I2C_MAX_STANDARD_MODE_FREQ) {
+		tmp &= ~ALTR_I2C_CTRL_BSPEED;
+		/* Standard mode SCL 50/50 */
+		t_high = divisor * 1 / 2;
+		t_low = divisor * 1 / 2;
+	} else {
+		tmp |= ALTR_I2C_CTRL_BSPEED;
+		/* Fast mode SCL 33/66 */
+		t_high = divisor * 1 / 3;
+		t_low = divisor * 2 / 3;
+	}
+	writel(tmp, idev->base + ALTR_I2C_CTRL);
+
+	dev_dbg(idev->dev, "rate=%uHz per_clk=%uMHz -> ratio=1:%u\n",
+		idev->bus_clk_rate, clk_mhz, divisor);
+
+	/* Reset controller */
+	altr_i2c_reset(idev);
+
+	/* SCL High Time */
+	writel(t_high, idev->base + ALTR_I2C_SCL_HIGH);
+	/* SCL Low Time */
+	writel(t_low, idev->base + ALTR_I2C_SCL_LOW);
+	/* SDA Hold Time, 300ns */
+	writel(3 * clk_mhz / 10, idev->base + ALTR_I2C_SDA_HOLD);
+
+	/* Mask all master interrupt bits */
+	altr_i2c_int_enable(idev, ALTR_I2C_ALL_IRQ, false);
+}
+
+/*
+ * altr_i2c_transfer - On the last byte to be transmitted, send
+ * a Stop bit on the last byte.
+ */
+static void altr_i2c_transfer(struct altr_i2c_dev *idev, u32 data)
+{
+	/* On the last byte to be transmitted, send STOP */
+	if (idev->msg_len == 1)
+		data |= ALTR_I2C_TFR_CMD_STO;
+	if (idev->msg_len > 0)
+		writel(data, idev->base + ALTR_I2C_TFR_CMD);
+}
+
+/*
+ * altr_i2c_empty_rx_fifo - Fetch data from RX FIFO until end of
+ * transfer. Send a Stop bit on the last byte.
+ */
+static void altr_i2c_empty_rx_fifo(struct altr_i2c_dev *idev)
+{
+	size_t rx_fifo_avail = readl(idev->base + ALTR_I2C_RX_FIFO_LVL);
+	int bytes_to_transfer = min(rx_fifo_avail, idev->msg_len);
+
+	while (bytes_to_transfer-- > 0) {
+		*idev->buf++ = readl(idev->base + ALTR_I2C_RX_DATA);
+		idev->msg_len--;
+		altr_i2c_transfer(idev, 0);
+	}
+}
+
+/*
+ * altr_i2c_fill_tx_fifo - Fill TX FIFO from current message buffer.
+ */
+static int altr_i2c_fill_tx_fifo(struct altr_i2c_dev *idev)
+{
+	size_t tx_fifo_avail = idev->fifo_size - readl(idev->base +
+						       ALTR_I2C_TC_FIFO_LVL);
+	int bytes_to_transfer = min(tx_fifo_avail, idev->msg_len);
+	int ret = idev->msg_len - bytes_to_transfer;
+
+	while (bytes_to_transfer-- > 0) {
+		altr_i2c_transfer(idev, *idev->buf++);
+		idev->msg_len--;
+	}
+
+	return ret;
+}
+
+static irqreturn_t altr_i2c_isr_quick(int irq, void *_dev)
+{
+	struct altr_i2c_dev *idev = _dev;
+	irqreturn_t ret = IRQ_HANDLED;
+
+	/* Read IRQ status but only interested in Enabled IRQs. */
+	idev->isr_status = readl(idev->base + ALTR_I2C_ISR) & idev->isr_mask;
+	if (idev->isr_status)
+		ret = IRQ_WAKE_THREAD;
+
+	return ret;
+}
+
+static irqreturn_t altr_i2c_isr(int irq, void *_dev)
+{
+	int ret;
+	bool read, finish = false;
+	struct altr_i2c_dev *idev = _dev;
+	u32 status = idev->isr_status;
+
+	mutex_lock(&idev->isr_mutex);
+	if (!idev->msg) {
+		dev_warn(idev->dev, "unexpected interrupt\n");
+		altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ);
+		goto out;
+	}
+	read = (idev->msg->flags & I2C_M_RD) != 0;
+
+	/* handle Lost Arbitration */
+	if (unlikely(status & ALTR_I2C_ISR_ARB)) {
+		altr_i2c_int_clear(idev, ALTR_I2C_ISR_ARB);
+		idev->msg_err = -EAGAIN;
+		finish = true;
+	} else if (unlikely(status & ALTR_I2C_ISR_NACK)) {
+		dev_dbg(idev->dev, "Could not get ACK\n");
+		idev->msg_err = -ENXIO;
+		altr_i2c_int_clear(idev, ALTR_I2C_ISR_NACK);
+		altr_i2c_stop(idev);
+		finish = true;
+	} else if (read && unlikely(status & ALTR_I2C_ISR_RXOF)) {
+		/* handle RX FIFO Overflow */
+		altr_i2c_empty_rx_fifo(idev);
+		altr_i2c_int_clear(idev, ALTR_I2C_ISR_RXRDY);
+		altr_i2c_stop(idev);
+		dev_err(idev->dev, "RX FIFO Overflow\n");
+		finish = true;
+	} else if (read && (status & ALTR_I2C_ISR_RXRDY)) {
+		/* RX FIFO needs service? */
+		altr_i2c_empty_rx_fifo(idev);
+		altr_i2c_int_clear(idev, ALTR_I2C_ISR_RXRDY);
+		if (!idev->msg_len)
+			finish = true;
+	} else if (!read && (status & ALTR_I2C_ISR_TXRDY)) {
+		/* TX FIFO needs service? */
+		altr_i2c_int_clear(idev, ALTR_I2C_ISR_TXRDY);
+		if (idev->msg_len > 0)
+			altr_i2c_fill_tx_fifo(idev);
+		else
+			finish = true;
+	} else {
+		dev_warn(idev->dev, "Unexpected interrupt: 0x%x\n", status);
+		altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ);
+	}
+
+	if (finish) {
+		/* Wait for the Core to finish */
+		ret = readl_poll_timeout_atomic(idev->base + ALTR_I2C_STATUS,
+						status,
+						!(status & ALTR_I2C_STAT_CORE),
+						1, ALTR_I2C_TIMEOUT);
+		if (ret)
+			dev_err(idev->dev, "message timeout\n");
+		altr_i2c_int_enable(idev, ALTR_I2C_ALL_IRQ, false);
+		altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ);
+		complete(&idev->msg_complete);
+		dev_dbg(idev->dev, "Message Complete\n");
+	}
+out:
+	mutex_unlock(&idev->isr_mutex);
+
+	return IRQ_HANDLED;
+}
+
+static int altr_i2c_xfer_msg(struct altr_i2c_dev *idev, struct i2c_msg *msg)
+{
+	u32 imask = ALTR_I2C_ISR_RXOF | ALTR_I2C_ISR_ARB | ALTR_I2C_ISR_NACK;
+	unsigned long time_left;
+	u32 value;
+	u8 addr = i2c_8bit_addr_from_msg(msg);
+
+	mutex_lock(&idev->isr_mutex);
+	idev->msg = msg;
+	idev->msg_len = msg->len;
+	idev->buf = msg->buf;
+	idev->msg_err = 0;
+	reinit_completion(&idev->msg_complete);
+	altr_i2c_core_enable(idev);
+
+	/* Make sure RX FIFO is empty */
+	do {
+		readl(idev->base + ALTR_I2C_RX_DATA);
+	} while (readl(idev->base + ALTR_I2C_RX_FIFO_LVL));
+
+	writel(ALTR_I2C_TFR_CMD_STA | addr, idev->base + ALTR_I2C_TFR_CMD);
+
+	if ((msg->flags & I2C_M_RD) != 0) {
+		imask |= ALTR_I2C_ISER_RXOF_EN | ALTR_I2C_ISER_RXRDY_EN;
+		altr_i2c_int_enable(idev, imask, true);
+		/* write the first byte to start the RX */
+		altr_i2c_transfer(idev, 0);
+	} else {
+		imask |= ALTR_I2C_ISR_TXRDY;
+		altr_i2c_int_enable(idev, imask, true);
+		altr_i2c_fill_tx_fifo(idev);
+	}
+	mutex_unlock(&idev->isr_mutex);
+
+	time_left = wait_for_completion_timeout(&idev->msg_complete,
+						ALTR_I2C_XFER_TIMEOUT);
+	mutex_lock(&idev->isr_mutex);
+	altr_i2c_int_enable(idev, imask, false);
+
+	value = readl(idev->base + ALTR_I2C_STATUS) & ALTR_I2C_STAT_CORE;
+	if (value)
+		dev_err(idev->dev, "Core Status not IDLE...\n");
+
+	if (time_left == 0) {
+		idev->msg_err = -ETIMEDOUT;
+		dev_dbg(idev->dev, "Transaction timed out.\n");
+	}
+
+	altr_i2c_core_disable(idev);
+	mutex_unlock(&idev->isr_mutex);
+
+	return idev->msg_err;
+}
+
+static int
+altr_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+	struct altr_i2c_dev *idev = i2c_get_adapdata(adap);
+	int i, ret;
+
+	for (i = 0; i < num; i++) {
+		ret = altr_i2c_xfer_msg(idev, msgs++);
+		if (ret)
+			return ret;
+	}
+	return num;
+}
+
+static u32 altr_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm altr_i2c_algo = {
+	.master_xfer = altr_i2c_xfer,
+	.functionality = altr_i2c_func,
+};
+
+static int altr_i2c_probe(struct platform_device *pdev)
+{
+	struct altr_i2c_dev *idev = NULL;
+	int irq, ret;
+
+	idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
+	if (!idev)
+		return -ENOMEM;
+
+	idev->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(idev->base))
+		return PTR_ERR(idev->base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	idev->i2c_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(idev->i2c_clk)) {
+		dev_err(&pdev->dev, "missing clock\n");
+		return PTR_ERR(idev->i2c_clk);
+	}
+
+	idev->dev = &pdev->dev;
+	init_completion(&idev->msg_complete);
+	mutex_init(&idev->isr_mutex);
+
+	ret = device_property_read_u32(idev->dev, "fifo-size",
+				       &idev->fifo_size);
+	if (ret) {
+		dev_err(&pdev->dev, "FIFO size set to default of %d\n",
+			ALTR_I2C_DFLT_FIFO_SZ);
+		idev->fifo_size = ALTR_I2C_DFLT_FIFO_SZ;
+	}
+
+	ret = device_property_read_u32(idev->dev, "clock-frequency",
+				       &idev->bus_clk_rate);
+	if (ret) {
+		dev_err(&pdev->dev, "Default to 100kHz\n");
+		idev->bus_clk_rate = I2C_MAX_STANDARD_MODE_FREQ;	/* default clock rate */
+	}
+
+	if (idev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ) {
+		dev_err(&pdev->dev, "invalid clock-frequency %d\n",
+			idev->bus_clk_rate);
+		return -EINVAL;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, irq, altr_i2c_isr_quick,
+					altr_i2c_isr, IRQF_ONESHOT,
+					pdev->name, idev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to claim IRQ %d\n", irq);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(idev->i2c_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable clock\n");
+		return ret;
+	}
+
+	mutex_lock(&idev->isr_mutex);
+	altr_i2c_init(idev);
+	mutex_unlock(&idev->isr_mutex);
+
+	i2c_set_adapdata(&idev->adapter, idev);
+	strscpy(idev->adapter.name, pdev->name, sizeof(idev->adapter.name));
+	idev->adapter.owner = THIS_MODULE;
+	idev->adapter.algo = &altr_i2c_algo;
+	idev->adapter.dev.parent = &pdev->dev;
+	idev->adapter.dev.of_node = pdev->dev.of_node;
+
+	platform_set_drvdata(pdev, idev);
+
+	ret = i2c_add_adapter(&idev->adapter);
+	if (ret) {
+		clk_disable_unprepare(idev->i2c_clk);
+		return ret;
+	}
+	dev_info(&pdev->dev, "Altera SoftIP I2C Probe Complete\n");
+
+	return 0;
+}
+
+static int altr_i2c_remove(struct platform_device *pdev)
+{
+	struct altr_i2c_dev *idev = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(idev->i2c_clk);
+	i2c_del_adapter(&idev->adapter);
+
+	return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id altr_i2c_of_match[] = {
+	{ .compatible = "altr,softip-i2c-v1.0" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, altr_i2c_of_match);
+
+static struct platform_driver altr_i2c_driver = {
+	.probe = altr_i2c_probe,
+	.remove = altr_i2c_remove,
+	.driver = {
+		.name = "altera-i2c",
+		.of_match_table = altr_i2c_of_match,
+	},
+};
+
+module_platform_driver(altr_i2c_driver);
+
+MODULE_DESCRIPTION("Altera Soft IP I2C bus driver");
+MODULE_AUTHOR("Thor Thayer <thor.thayer@linux.intel.com>");
+MODULE_LICENSE("GPL v2");