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, 671 insertions, 0 deletions

diff --git a/drivers/pci/controller/pci-ixp4xx.c b/drivers/pci/controller/pci-ixp4xx.c
new file mode 100644
index 000000000..654ac4a82
--- /dev/null
+++ b/drivers/pci/controller/pci-ixp4xx.c
@@ -0,0 +1,671 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for Intel IXP4xx PCI host controller
+ *
+ * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
+ *
+ * Based on the IXP4xx arch/arm/mach-ixp4xx/common-pci.c driver
+ * Copyright (C) 2002 Intel Corporation
+ * Copyright (C) 2003 Greg Ungerer <gerg@linux-m68k.org>
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ * Copyright (C) 2005 Deepak Saxena <dsaxena@plexity.net>
+ * Copyright (C) 2005 Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * TODO:
+ * - Test IO-space access
+ * - DMA support
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/bits.h>
+
+/* Register offsets */
+#define IXP4XX_PCI_NP_AD		0x00
+#define IXP4XX_PCI_NP_CBE		0x04
+#define IXP4XX_PCI_NP_WDATA		0x08
+#define IXP4XX_PCI_NP_RDATA		0x0c
+#define IXP4XX_PCI_CRP_AD_CBE		0x10
+#define IXP4XX_PCI_CRP_WDATA		0x14
+#define IXP4XX_PCI_CRP_RDATA		0x18
+#define IXP4XX_PCI_CSR			0x1c
+#define IXP4XX_PCI_ISR			0x20
+#define IXP4XX_PCI_INTEN		0x24
+#define IXP4XX_PCI_DMACTRL		0x28
+#define IXP4XX_PCI_AHBMEMBASE		0x2c
+#define IXP4XX_PCI_AHBIOBASE		0x30
+#define IXP4XX_PCI_PCIMEMBASE		0x34
+#define IXP4XX_PCI_AHBDOORBELL		0x38
+#define IXP4XX_PCI_PCIDOORBELL		0x3c
+#define IXP4XX_PCI_ATPDMA0_AHBADDR	0x40
+#define IXP4XX_PCI_ATPDMA0_PCIADDR	0x44
+#define IXP4XX_PCI_ATPDMA0_LENADDR	0x48
+#define IXP4XX_PCI_ATPDMA1_AHBADDR	0x4c
+#define IXP4XX_PCI_ATPDMA1_PCIADDR	0x50
+#define IXP4XX_PCI_ATPDMA1_LENADDR	0x54
+
+/* CSR bit definitions */
+#define IXP4XX_PCI_CSR_HOST		BIT(0)
+#define IXP4XX_PCI_CSR_ARBEN		BIT(1)
+#define IXP4XX_PCI_CSR_ADS		BIT(2)
+#define IXP4XX_PCI_CSR_PDS		BIT(3)
+#define IXP4XX_PCI_CSR_ABE		BIT(4)
+#define IXP4XX_PCI_CSR_DBT		BIT(5)
+#define IXP4XX_PCI_CSR_ASE		BIT(8)
+#define IXP4XX_PCI_CSR_IC		BIT(15)
+#define IXP4XX_PCI_CSR_PRST		BIT(16)
+
+/* ISR (Interrupt status) Register bit definitions */
+#define IXP4XX_PCI_ISR_PSE		BIT(0)
+#define IXP4XX_PCI_ISR_PFE		BIT(1)
+#define IXP4XX_PCI_ISR_PPE		BIT(2)
+#define IXP4XX_PCI_ISR_AHBE		BIT(3)
+#define IXP4XX_PCI_ISR_APDC		BIT(4)
+#define IXP4XX_PCI_ISR_PADC		BIT(5)
+#define IXP4XX_PCI_ISR_ADB		BIT(6)
+#define IXP4XX_PCI_ISR_PDB		BIT(7)
+
+/* INTEN (Interrupt Enable) Register bit definitions */
+#define IXP4XX_PCI_INTEN_PSE		BIT(0)
+#define IXP4XX_PCI_INTEN_PFE		BIT(1)
+#define IXP4XX_PCI_INTEN_PPE		BIT(2)
+#define IXP4XX_PCI_INTEN_AHBE		BIT(3)
+#define IXP4XX_PCI_INTEN_APDC		BIT(4)
+#define IXP4XX_PCI_INTEN_PADC		BIT(5)
+#define IXP4XX_PCI_INTEN_ADB		BIT(6)
+#define IXP4XX_PCI_INTEN_PDB		BIT(7)
+
+/* Shift value for byte enable on NP cmd/byte enable register */
+#define IXP4XX_PCI_NP_CBE_BESL		4
+
+/* PCI commands supported by NP access unit */
+#define NP_CMD_IOREAD			0x2
+#define NP_CMD_IOWRITE			0x3
+#define NP_CMD_CONFIGREAD		0xa
+#define NP_CMD_CONFIGWRITE		0xb
+#define NP_CMD_MEMREAD			0x6
+#define	NP_CMD_MEMWRITE			0x7
+
+/* Constants for CRP access into local config space */
+#define CRP_AD_CBE_BESL         20
+#define CRP_AD_CBE_WRITE	0x00010000
+
+/* Special PCI configuration space registers for this controller */
+#define IXP4XX_PCI_RTOTTO		0x40
+
+struct ixp4xx_pci {
+	struct device *dev;
+	void __iomem *base;
+	bool errata_hammer;
+	bool host_mode;
+};
+
+/*
+ * The IXP4xx has a peculiar address bus that will change the
+ * byte order on SoC peripherals depending on whether the device
+ * operates in big-endian or little-endian mode. That means that
+ * readl() and writel() that always use little-endian access
+ * will not work for SoC peripherals such as the PCI controller
+ * when used in big-endian mode. The accesses to the individual
+ * PCI devices on the other hand, are always little-endian and
+ * can use readl() and writel().
+ *
+ * For local AHB bus access we need to use __raw_[readl|writel]()
+ * to make sure that we access the SoC devices in the CPU native
+ * endianness.
+ */
+static inline u32 ixp4xx_readl(struct ixp4xx_pci *p, u32 reg)
+{
+	return __raw_readl(p->base + reg);
+}
+
+static inline void ixp4xx_writel(struct ixp4xx_pci *p, u32 reg, u32 val)
+{
+	__raw_writel(val, p->base + reg);
+}
+
+static int ixp4xx_pci_check_master_abort(struct ixp4xx_pci *p)
+{
+	u32 isr = ixp4xx_readl(p, IXP4XX_PCI_ISR);
+
+	if (isr & IXP4XX_PCI_ISR_PFE) {
+		/* Make sure the master abort bit is reset */
+		ixp4xx_writel(p, IXP4XX_PCI_ISR, IXP4XX_PCI_ISR_PFE);
+		dev_dbg(p->dev, "master abort detected\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ixp4xx_pci_read_indirect(struct ixp4xx_pci *p, u32 addr, u32 cmd, u32 *data)
+{
+	ixp4xx_writel(p, IXP4XX_PCI_NP_AD, addr);
+
+	if (p->errata_hammer) {
+		int i;
+
+		/*
+		 * PCI workaround - only works if NP PCI space reads have
+		 * no side effects. Hammer the register and read twice 8
+		 * times. last one will be good.
+		 */
+		for (i = 0; i < 8; i++) {
+			ixp4xx_writel(p, IXP4XX_PCI_NP_CBE, cmd);
+			*data = ixp4xx_readl(p, IXP4XX_PCI_NP_RDATA);
+			*data = ixp4xx_readl(p, IXP4XX_PCI_NP_RDATA);
+		}
+	} else {
+		ixp4xx_writel(p, IXP4XX_PCI_NP_CBE, cmd);
+		*data = ixp4xx_readl(p, IXP4XX_PCI_NP_RDATA);
+	}
+
+	return ixp4xx_pci_check_master_abort(p);
+}
+
+static int ixp4xx_pci_write_indirect(struct ixp4xx_pci *p, u32 addr, u32 cmd, u32 data)
+{
+	ixp4xx_writel(p, IXP4XX_PCI_NP_AD, addr);
+
+	/* Set up the write */
+	ixp4xx_writel(p, IXP4XX_PCI_NP_CBE, cmd);
+
+	/* Execute the write by writing to NP_WDATA */
+	ixp4xx_writel(p, IXP4XX_PCI_NP_WDATA, data);
+
+	return ixp4xx_pci_check_master_abort(p);
+}
+
+static u32 ixp4xx_config_addr(u8 bus_num, u16 devfn, int where)
+{
+	/* Root bus is always 0 in this hardware */
+	if (bus_num == 0) {
+		/* type 0 */
+		return BIT(32-PCI_SLOT(devfn)) | ((PCI_FUNC(devfn)) << 8) |
+			(where & ~3);
+	} else {
+		/* type 1 */
+		return (bus_num << 16) | ((PCI_SLOT(devfn)) << 11) |
+			((PCI_FUNC(devfn)) << 8) | (where & ~3) | 1;
+	}
+}
+
+/*
+ * CRP functions are "Controller Configuration Port" accesses
+ * initiated from within this driver itself to read/write PCI
+ * control information in the config space.
+ */
+static u32 ixp4xx_crp_byte_lane_enable_bits(u32 n, int size)
+{
+	if (size == 1)
+		return (0xf & ~BIT(n)) << CRP_AD_CBE_BESL;
+	if (size == 2)
+		return (0xf & ~(BIT(n) | BIT(n+1))) << CRP_AD_CBE_BESL;
+	if (size == 4)
+		return 0;
+	return 0xffffffff;
+}
+
+static int ixp4xx_crp_read_config(struct ixp4xx_pci *p, int where, int size,
+				  u32 *value)
+{
+	u32 n, cmd, val;
+
+	n = where % 4;
+	cmd = where & ~3;
+
+	dev_dbg(p->dev, "%s from %d size %d cmd %08x\n",
+		__func__, where, size, cmd);
+
+	ixp4xx_writel(p, IXP4XX_PCI_CRP_AD_CBE, cmd);
+	val = ixp4xx_readl(p, IXP4XX_PCI_CRP_RDATA);
+
+	val >>= (8*n);
+	switch (size) {
+	case 1:
+		val &= U8_MAX;
+		dev_dbg(p->dev, "%s read byte %02x\n", __func__, val);
+		break;
+	case 2:
+		val &= U16_MAX;
+		dev_dbg(p->dev, "%s read word %04x\n", __func__, val);
+		break;
+	case 4:
+		val &= U32_MAX;
+		dev_dbg(p->dev, "%s read long %08x\n", __func__, val);
+		break;
+	default:
+		/* Should not happen */
+		dev_err(p->dev, "%s illegal size\n", __func__);
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+	*value = val;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int ixp4xx_crp_write_config(struct ixp4xx_pci *p, int where, int size,
+				   u32 value)
+{
+	u32 n, cmd, val;
+
+	n = where % 4;
+	cmd = ixp4xx_crp_byte_lane_enable_bits(n, size);
+	if (cmd == 0xffffffff)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	cmd |= where & ~3;
+	cmd |= CRP_AD_CBE_WRITE;
+
+	val = value << (8*n);
+
+	dev_dbg(p->dev, "%s to %d size %d cmd %08x val %08x\n",
+		__func__, where, size, cmd, val);
+
+	ixp4xx_writel(p, IXP4XX_PCI_CRP_AD_CBE, cmd);
+	ixp4xx_writel(p, IXP4XX_PCI_CRP_WDATA, val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * Then follows the functions that read and write from the common PCI
+ * configuration space.
+ */
+static u32 ixp4xx_byte_lane_enable_bits(u32 n, int size)
+{
+	if (size == 1)
+		return (0xf & ~BIT(n)) << 4;
+	if (size == 2)
+		return (0xf & ~(BIT(n) | BIT(n+1))) << 4;
+	if (size == 4)
+		return 0;
+	return 0xffffffff;
+}
+
+static int ixp4xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
+				  int where, int size, u32 *value)
+{
+	struct ixp4xx_pci *p = bus->sysdata;
+	u32 n, addr, val, cmd;
+	u8 bus_num = bus->number;
+	int ret;
+
+	*value = 0xffffffff;
+	n = where % 4;
+	cmd = ixp4xx_byte_lane_enable_bits(n, size);
+	if (cmd == 0xffffffff)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	addr = ixp4xx_config_addr(bus_num, devfn, where);
+	cmd |= NP_CMD_CONFIGREAD;
+	dev_dbg(p->dev, "read_config from %d size %d dev %d:%d:%d address: %08x cmd: %08x\n",
+		where, size, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn), addr, cmd);
+
+	ret = ixp4xx_pci_read_indirect(p, addr, cmd, &val);
+	if (ret)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	val >>= (8*n);
+	switch (size) {
+	case 1:
+		val &= U8_MAX;
+		dev_dbg(p->dev, "%s read byte %02x\n", __func__, val);
+		break;
+	case 2:
+		val &= U16_MAX;
+		dev_dbg(p->dev, "%s read word %04x\n", __func__, val);
+		break;
+	case 4:
+		val &= U32_MAX;
+		dev_dbg(p->dev, "%s read long %08x\n", __func__, val);
+		break;
+	default:
+		/* Should not happen */
+		dev_err(p->dev, "%s illegal size\n", __func__);
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+	*value = val;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int ixp4xx_pci_write_config(struct pci_bus *bus,  unsigned int devfn,
+				   int where, int size, u32 value)
+{
+	struct ixp4xx_pci *p = bus->sysdata;
+	u32 n, addr, val, cmd;
+	u8 bus_num = bus->number;
+	int ret;
+
+	n = where % 4;
+	cmd = ixp4xx_byte_lane_enable_bits(n, size);
+	if (cmd == 0xffffffff)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	addr = ixp4xx_config_addr(bus_num, devfn, where);
+	cmd |= NP_CMD_CONFIGWRITE;
+	val = value << (8*n);
+
+	dev_dbg(p->dev, "write_config_byte %#x to %d size %d dev %d:%d:%d addr: %08x cmd %08x\n",
+		value, where, size, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn), addr, cmd);
+
+	ret = ixp4xx_pci_write_indirect(p, addr, cmd, val);
+	if (ret)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops ixp4xx_pci_ops = {
+	.read = ixp4xx_pci_read_config,
+	.write = ixp4xx_pci_write_config,
+};
+
+static u32 ixp4xx_pci_addr_to_64mconf(phys_addr_t addr)
+{
+	u8 base;
+
+	base = ((addr & 0xff000000) >> 24);
+	return (base << 24) | ((base + 1) << 16)
+		| ((base + 2) << 8) | (base + 3);
+}
+
+static int ixp4xx_pci_parse_map_ranges(struct ixp4xx_pci *p)
+{
+	struct device *dev = p->dev;
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(p);
+	struct resource_entry *win;
+	struct resource *res;
+	phys_addr_t addr;
+
+	win = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
+	if (win) {
+		u32 pcimembase;
+
+		res = win->res;
+		addr = res->start - win->offset;
+
+		if (res->flags & IORESOURCE_PREFETCH)
+			res->name = "IXP4xx PCI PRE-MEM";
+		else
+			res->name = "IXP4xx PCI NON-PRE-MEM";
+
+		dev_dbg(dev, "%s window %pR, bus addr %pa\n",
+			res->name, res, &addr);
+		if (resource_size(res) != SZ_64M) {
+			dev_err(dev, "memory range is not 64MB\n");
+			return -EINVAL;
+		}
+
+		pcimembase = ixp4xx_pci_addr_to_64mconf(addr);
+		/* Commit configuration */
+		ixp4xx_writel(p, IXP4XX_PCI_PCIMEMBASE, pcimembase);
+	} else {
+		dev_err(dev, "no AHB memory mapping defined\n");
+	}
+
+	win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
+	if (win) {
+		res = win->res;
+
+		addr = pci_pio_to_address(res->start);
+		if (addr & 0xff) {
+			dev_err(dev, "IO mem at uneven address: %pa\n", &addr);
+			return -EINVAL;
+		}
+
+		res->name = "IXP4xx PCI IO MEM";
+		/*
+		 * Setup I/O space location for PCI->AHB access, the
+		 * upper 24 bits of the address goes into the lower
+		 * 24 bits of this register.
+		 */
+		ixp4xx_writel(p, IXP4XX_PCI_AHBIOBASE, (addr >> 8));
+	} else {
+		dev_info(dev, "no IO space AHB memory mapping defined\n");
+	}
+
+	return 0;
+}
+
+static int ixp4xx_pci_parse_map_dma_ranges(struct ixp4xx_pci *p)
+{
+	struct device *dev = p->dev;
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(p);
+	struct resource_entry *win;
+	struct resource *res;
+	phys_addr_t addr;
+	u32 ahbmembase;
+
+	win = resource_list_first_type(&bridge->dma_ranges, IORESOURCE_MEM);
+	if (win) {
+		res = win->res;
+		addr = res->start - win->offset;
+
+		if (resource_size(res) != SZ_64M) {
+			dev_err(dev, "DMA memory range is not 64MB\n");
+			return -EINVAL;
+		}
+
+		dev_dbg(dev, "DMA MEM BASE: %pa\n", &addr);
+		/*
+		 * 4 PCI-to-AHB windows of 16 MB each, write the 8 high bits
+		 * into each byte of the PCI_AHBMEMBASE register.
+		 */
+		ahbmembase = ixp4xx_pci_addr_to_64mconf(addr);
+		/* Commit AHB membase */
+		ixp4xx_writel(p, IXP4XX_PCI_AHBMEMBASE, ahbmembase);
+	} else {
+		dev_err(dev, "no DMA memory range defined\n");
+	}
+
+	return 0;
+}
+
+/* Only used to get context for abort handling */
+static struct ixp4xx_pci *ixp4xx_pci_abort_singleton;
+
+static int ixp4xx_pci_abort_handler(unsigned long addr, unsigned int fsr,
+				    struct pt_regs *regs)
+{
+	struct ixp4xx_pci *p = ixp4xx_pci_abort_singleton;
+	u32 isr, status;
+	int ret;
+
+	isr = ixp4xx_readl(p, IXP4XX_PCI_ISR);
+	ret = ixp4xx_crp_read_config(p, PCI_STATUS, 2, &status);
+	if (ret) {
+		dev_err(p->dev, "unable to read abort status\n");
+		return -EINVAL;
+	}
+
+	dev_err(p->dev,
+		"PCI: abort_handler addr = %#lx, isr = %#x, status = %#x\n",
+		addr, isr, status);
+
+	/* Make sure the Master Abort bit is reset */
+	ixp4xx_writel(p, IXP4XX_PCI_ISR, IXP4XX_PCI_ISR_PFE);
+	status |= PCI_STATUS_REC_MASTER_ABORT;
+	ret = ixp4xx_crp_write_config(p, PCI_STATUS, 2, status);
+	if (ret)
+		dev_err(p->dev, "unable to clear abort status bit\n");
+
+	/*
+	 * If it was an imprecise abort, then we need to correct the
+	 * return address to be _after_ the instruction.
+	 */
+	if (fsr & (1 << 10)) {
+		dev_err(p->dev, "imprecise abort\n");
+		regs->ARM_pc += 4;
+	}
+
+	return 0;
+}
+
+static int __init ixp4xx_pci_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct ixp4xx_pci *p;
+	struct pci_host_bridge *host;
+	int ret;
+	u32 val;
+	phys_addr_t addr;
+	u32 basereg[4] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		PCI_BASE_ADDRESS_2,
+		PCI_BASE_ADDRESS_3,
+	};
+	int i;
+
+	host = devm_pci_alloc_host_bridge(dev, sizeof(*p));
+	if (!host)
+		return -ENOMEM;
+
+	host->ops = &ixp4xx_pci_ops;
+	p = pci_host_bridge_priv(host);
+	host->sysdata = p;
+	p->dev = dev;
+	dev_set_drvdata(dev, p);
+
+	/*
+	 * Set up quirk for erratic behaviour in the 42x variant
+	 * when accessing config space.
+	 */
+	if (of_device_is_compatible(np, "intel,ixp42x-pci")) {
+		p->errata_hammer = true;
+		dev_info(dev, "activate hammering errata\n");
+	}
+
+	p->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(p->base))
+		return PTR_ERR(p->base);
+
+	val = ixp4xx_readl(p, IXP4XX_PCI_CSR);
+	p->host_mode = !!(val & IXP4XX_PCI_CSR_HOST);
+	dev_info(dev, "controller is in %s mode\n",
+		 p->host_mode ? "host" : "option");
+
+	/* Hook in our fault handler for PCI errors */
+	ixp4xx_pci_abort_singleton = p;
+	hook_fault_code(16+6, ixp4xx_pci_abort_handler, SIGBUS, 0,
+			"imprecise external abort");
+
+	ret = ixp4xx_pci_parse_map_ranges(p);
+	if (ret)
+		return ret;
+
+	ret = ixp4xx_pci_parse_map_dma_ranges(p);
+	if (ret)
+		return ret;
+
+	/* This is only configured in host mode */
+	if (p->host_mode) {
+		addr = __pa(PAGE_OFFSET);
+		/* This is a noop (0x00) but explains what is going on */
+		addr |= PCI_BASE_ADDRESS_SPACE_MEMORY;
+
+		for (i = 0; i < 4; i++) {
+			/* Write this directly into the config space */
+			ret = ixp4xx_crp_write_config(p, basereg[i], 4, addr);
+			if (ret)
+				dev_err(dev, "failed to set up PCI_BASE_ADDRESS_%d\n", i);
+			else
+				dev_info(dev, "set PCI_BASE_ADDR_%d to %pa\n", i, &addr);
+			addr += SZ_16M;
+		}
+
+		/*
+		 * Enable CSR window at 64 MiB to allow PCI masters to continue
+		 * prefetching past the 64 MiB boundary, if all AHB to PCI
+		 * windows are consecutive.
+		 */
+		ret = ixp4xx_crp_write_config(p, PCI_BASE_ADDRESS_4, 4, addr);
+		if (ret)
+			dev_err(dev, "failed to set up PCI_BASE_ADDRESS_4\n");
+		else
+			dev_info(dev, "set PCI_BASE_ADDR_4 to %pa\n", &addr);
+
+		/*
+		 * Put the IO memory window at the very end of physical memory
+		 * at 0xfffffc00. This is when the system is trying to access IO
+		 * memory over AHB.
+		 */
+		addr = 0xfffffc00;
+		addr |= PCI_BASE_ADDRESS_SPACE_IO;
+		ret = ixp4xx_crp_write_config(p, PCI_BASE_ADDRESS_5, 4, addr);
+		if (ret)
+			dev_err(dev, "failed to set up PCI_BASE_ADDRESS_5\n");
+		else
+			dev_info(dev, "set PCI_BASE_ADDR_5 to %pa\n", &addr);
+
+		/*
+		 * Retry timeout to 0x80
+		 * Transfer ready timeout to 0xff
+		 */
+		ret = ixp4xx_crp_write_config(p, IXP4XX_PCI_RTOTTO, 4,
+					      0x000080ff);
+		if (ret)
+			dev_err(dev, "failed to set up TRDY limit\n");
+		else
+			dev_info(dev, "set TRDY limit to 0x80ff\n");
+	}
+
+	/* Clear interrupts */
+	val = IXP4XX_PCI_ISR_PSE | IXP4XX_PCI_ISR_PFE | IXP4XX_PCI_ISR_PPE | IXP4XX_PCI_ISR_AHBE;
+	ixp4xx_writel(p, IXP4XX_PCI_ISR, val);
+
+	/*
+	 * Set Initialize Complete in PCI Control Register: allow IXP4XX to
+	 * generate PCI configuration cycles. Specify that the AHB bus is
+	 * operating in big-endian mode. Set up byte lane swapping between
+	 * little-endian PCI and the big-endian AHB bus.
+	 */
+	val = IXP4XX_PCI_CSR_IC | IXP4XX_PCI_CSR_ABE;
+	if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		val |= (IXP4XX_PCI_CSR_PDS | IXP4XX_PCI_CSR_ADS);
+	ixp4xx_writel(p, IXP4XX_PCI_CSR, val);
+
+	ret = ixp4xx_crp_write_config(p, PCI_COMMAND, 2, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
+	if (ret)
+		dev_err(dev, "unable to initialize master and command memory\n");
+	else
+		dev_info(dev, "initialized as master\n");
+
+	pci_host_probe(host);
+
+	return 0;
+}
+
+static const struct of_device_id ixp4xx_pci_of_match[] = {
+	{
+		.compatible = "intel,ixp42x-pci",
+	},
+	{
+		.compatible = "intel,ixp43x-pci",
+	},
+	{},
+};
+
+/*
+ * This driver needs to be a builtin module with suppressed bind
+ * attributes since the probe() is initializing a hard exception
+ * handler and this can only be done from __init-tagged code
+ * sections. This module cannot be removed and inserted at all.
+ */
+static struct platform_driver ixp4xx_pci_driver = {
+	.driver = {
+		.name = "ixp4xx-pci",
+		.suppress_bind_attrs = true,
+		.of_match_table = ixp4xx_pci_of_match,
+	},
+};
+builtin_platform_driver_probe(ixp4xx_pci_driver, ixp4xx_pci_probe);