Add support for external PCIe (PEM) on Cavium's ThunderX

Reviewed by:   jhb
Obtained from: Semihalf
Sponsored by:  The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3257

2 files changed, 638 insertions, 0 deletions

diff --git a/sys/arm64/cavium/thunder_pcie_pem.c b/sys/arm64/cavium/thunder_pcie_pem.c
new file mode 100644
index 0000000..23f1446
--- /dev/null
+++ b/sys/arm64/cavium/thunder_pcie_pem.c
@@ -0,0 +1,637 @@
+/*-
+ * Copyright (c) 2015 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under
+ * the sponsorship of the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* PCIe external MAC root complex driver (PEM) for Cavium Thunder SOC */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/endian.h>
+
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcireg.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/smp.h>
+#include <machine/intr.h>
+
+#include "thunder_pcie_common.h"
+#include "pcib_if.h"
+
+#define	THUNDER_PEM_DEVICE_ID		0xa020
+#define	THUNDER_PEM_VENDOR_ID		0x177d
+#define	THUNDER_PEM_DESC		"ThunderX PEM"
+
+/* ThunderX specific defines */
+#define	THUNDER_PEMn_REG_BASE(unit)	(0x87e0c0000000UL | ((unit) << 24))
+#define	PCIERC_CFG002			0x08
+#define	PCIERC_CFG006			0x18
+#define	PCIERC_CFG032			0x80
+#define	PCIERC_CFG006_SEC_BUS(reg)	(((reg) >> 8) & 0xFF)
+#define	PEM_CFG_RD_REG_ALIGN(reg)	((reg) & ~0x3)
+#define	PEM_CFG_RD_REG_DATA(val)	(((val) >> 32) & 0xFFFFFFFF)
+#define	PEM_CFG_RD			0x30
+#define	PEM_CFG_LINK_MASK		0x3
+#define	PEM_CFG_LINK_RDY		0x3
+#define	PEM_CFG_SLIX_TO_REG(slix)	((slix) << 4)
+#define	SBNUM_OFFSET			0x8
+#define	SBNUM_MASK			0xFF
+#define	PEM_ON_REG			0x420
+#define	PEM_CTL_STATUS			0x0
+#define	PEM_LINK_ENABLE			(1 << 4)
+#define	PEM_LINK_DLLA			(1 << 29)
+#define	PEM_LINK_LT			(1 << 27)
+#define	PEM_BUS_SHIFT			(24)
+#define	PEM_SLOT_SHIFT			(19)
+#define	PEM_FUNC_SHIFT			(16)
+#define	SLIX_S2M_REGX_ACC		0x874001000000UL
+#define	SLIX_S2M_REGX_ACC_SIZE		0x1000
+#define	SLIX_S2M_REGX_ACC_SPACING	0x001000000000UL
+#define	SLI_BASE			0x880000000000UL
+#define	SLI_WINDOW_SPACING		0x004000000000UL
+#define	SLI_WINDOW_SIZE			0x0000FF000000UL
+#define	SLI_PCI_OFFSET			0x001000000000UL
+#define	SLI_NODE_SHIFT			(44)
+#define	SLI_NODE_MASK			(3)
+#define	SLI_GROUP_SHIFT			(40)
+#define	SLI_ID_SHIFT			(24)
+#define	SLI_ID_MASK			(7)
+#define	SLI_PEMS_PER_GROUP		(3)
+#define	SLI_GROUPS_PER_NODE		(2)
+#define	SLI_PEMS_PER_NODE		(SLI_PEMS_PER_GROUP * SLI_GROUPS_PER_NODE)
+#define	SLI_ACC_REG_CNT			(256)
+
+/*
+ * Each PEM device creates its own bus with
+ * own address translation, so we can adjust bus addresses
+ * as we want. To support 32-bit cards let's assume
+ * PCI window assignment looks as following:
+ *
+ * 0x00000000 - 0x000FFFFF	IO
+ * 0x00100000 - 0xFFFFFFFF	Memory
+ */
+#define	PCI_IO_BASE		0x00000000UL
+#define	PCI_IO_SIZE		0x00100000UL
+#define	PCI_MEMORY_BASE		PCI_IO_SIZE
+#define	PCI_MEMORY_SIZE		0xFFF00000UL
+
+struct thunder_pem_softc {
+	device_t		dev;
+	struct resource		*reg;
+	bus_space_tag_t		reg_bst;
+	bus_space_handle_t	reg_bsh;
+	struct pcie_range	ranges[MAX_RANGES_TUPLES];
+	struct rman		mem_rman;
+	struct rman		io_rman;
+	bus_space_handle_t	pem_sli_base;
+	uint32_t		node;
+	uint32_t		id;
+	uint32_t		sli;
+	uint32_t		sli_group;
+	uint64_t		sli_window_base;
+};
+
+static struct resource * thunder_pem_alloc_resource(device_t, device_t, int,
+    int *, u_long, u_long, u_long, u_int);
+static int thunder_pem_attach(device_t);
+static int thunder_pem_detach(device_t);
+static uint64_t thunder_pem_config_reg_read(struct thunder_pem_softc *, int);
+static int thunder_pem_link_init(struct thunder_pem_softc *);
+static int thunder_pem_maxslots(device_t);
+static int thunder_pem_probe(device_t);
+static uint32_t thunder_pem_read_config(device_t, u_int, u_int, u_int, u_int,
+    int);
+static int thunder_pem_read_ivar(device_t, device_t, int, uintptr_t *);
+static void thunder_pem_release_all(device_t);
+static int thunder_pem_release_resource(device_t, device_t, int, int,
+    struct resource *);
+static void thunder_pem_slix_s2m_regx_acc_modify(struct thunder_pem_softc *,
+    int, int);
+static void thunder_pem_write_config(device_t, u_int, u_int, u_int, u_int,
+    uint32_t, int);
+static int thunder_pem_write_ivar(device_t, device_t, int, uintptr_t);
+
+/* Global handlers for SLI interface */
+static bus_space_handle_t sli0_s2m_regx_base = 0;
+static bus_space_handle_t sli1_s2m_regx_base = 0;
+
+static device_method_t thunder_pem_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,			thunder_pem_probe),
+	DEVMETHOD(device_attach,		thunder_pem_attach),
+	DEVMETHOD(device_detach,		thunder_pem_detach),
+	DEVMETHOD(pcib_maxslots,		thunder_pem_maxslots),
+	DEVMETHOD(pcib_read_config,		thunder_pem_read_config),
+	DEVMETHOD(pcib_write_config,		thunder_pem_write_config),
+	DEVMETHOD(bus_read_ivar,		thunder_pem_read_ivar),
+	DEVMETHOD(bus_write_ivar,		thunder_pem_write_ivar),
+	DEVMETHOD(bus_alloc_resource,		thunder_pem_alloc_resource),
+	DEVMETHOD(bus_release_resource,		thunder_pem_release_resource),
+	DEVMETHOD(bus_activate_resource,	bus_generic_activate_resource),
+	DEVMETHOD(bus_deactivate_resource,	bus_generic_deactivate_resource),
+	DEVMETHOD(bus_setup_intr,		bus_generic_setup_intr),
+	DEVMETHOD(bus_teardown_intr,		bus_generic_teardown_intr),
+	DEVMETHOD(pcib_map_msi,			thunder_common_map_msi),
+	DEVMETHOD(pcib_alloc_msix,		thunder_common_alloc_msix),
+	DEVMETHOD(pcib_release_msix,		thunder_common_release_msix),
+	DEVMETHOD(pcib_alloc_msi,		thunder_common_alloc_msi),
+	DEVMETHOD(pcib_release_msi,		thunder_common_release_msi),
+	DEVMETHOD_END
+};
+
+static driver_t thunder_pem_driver = {
+	"pcib",
+	thunder_pem_methods,
+	sizeof(struct thunder_pem_softc),
+};
+
+static int
+thunder_pem_maxslots(device_t dev)
+{
+
+	/* max slots per bus acc. to standard */
+	return (PCI_SLOTMAX);
+}
+
+static int
+thunder_pem_read_ivar(device_t dev, device_t child, int index,
+    uintptr_t *result)
+{
+	struct thunder_pem_softc *sc;
+	int secondary_bus = 0;
+
+	sc = device_get_softc(dev);
+
+	if (index == PCIB_IVAR_BUS) {
+		secondary_bus = thunder_pem_config_reg_read(sc, PCIERC_CFG006);
+		*result = PCIERC_CFG006_SEC_BUS(secondary_bus);
+		return (0);
+	}
+	if (index == PCIB_IVAR_DOMAIN) {
+		*result = sc->id;
+		return (0);
+	}
+
+	return (ENOENT);
+}
+
+static int
+thunder_pem_write_ivar(device_t dev, device_t child, int index,
+    uintptr_t value)
+{
+
+	return (ENOENT);
+}
+
+static int
+thunder_pem_identify(device_t dev)
+{
+	struct thunder_pem_softc *sc;
+	u_long start;
+
+	sc = device_get_softc(dev);
+	start = rman_get_start(sc->reg);
+
+	/* Calculate PEM designations from its address */
+	sc->node = (start >> SLI_NODE_SHIFT) & SLI_NODE_MASK;
+	sc->id = ((start >> SLI_ID_SHIFT) & SLI_ID_MASK) +
+	    (SLI_PEMS_PER_NODE * sc->node);
+	sc->sli = sc->id % SLI_PEMS_PER_GROUP;
+	sc->sli_group = (sc->id / SLI_PEMS_PER_GROUP) % SLI_GROUPS_PER_NODE;
+	sc->sli_window_base = SLI_BASE |
+	    (((uint64_t)sc->node) << SLI_NODE_SHIFT) |
+	    ((uint64_t)sc->sli_group << SLI_GROUP_SHIFT);
+	sc->sli_window_base += SLI_WINDOW_SPACING * sc->sli;
+
+	return (0);
+}
+
+static void
+thunder_pem_slix_s2m_regx_acc_modify(struct thunder_pem_softc *sc,
+    int sli_group, int slix)
+{
+	uint64_t regval;
+	bus_space_handle_t handle = 0;
+
+	KASSERT(slix >= 0 && slix <= SLI_ACC_REG_CNT, ("Invalid SLI index"));
+
+	if (sli_group == 0)
+		handle = sli0_s2m_regx_base;
+	else if (sli_group == 1)
+		handle = sli1_s2m_regx_base;
+	else
+		device_printf(sc->dev, "SLI group is not correct\n");
+
+	if (handle) {
+		/* Clear lower 32-bits of the SLIx register */
+		regval = bus_space_read_8(sc->reg_bst, handle,
+		    PEM_CFG_SLIX_TO_REG(slix));
+		regval &= ~(0xFFFFFFFFUL);
+		bus_space_write_8(sc->reg_bst, handle,
+		    PEM_CFG_SLIX_TO_REG(slix), regval);
+	}
+}
+
+static int
+thunder_pem_link_init(struct thunder_pem_softc *sc)
+{
+	uint64_t regval;
+
+	/* check whether PEM is safe to access. */
+	regval = bus_space_read_8(sc->reg_bst, sc->reg_bsh, PEM_ON_REG);
+	if ((regval & PEM_CFG_LINK_MASK) != PEM_CFG_LINK_RDY) {
+		device_printf(sc->dev, "PEM%d is not ON\n", sc->id);
+		return (ENXIO);
+	}
+
+	regval = bus_space_read_8(sc->reg_bst, sc->reg_bsh, PEM_CTL_STATUS);
+	regval |= PEM_LINK_ENABLE;
+	bus_space_write_8(sc->reg_bst, sc->reg_bsh, PEM_CTL_STATUS, regval);
+
+	/* Wait 1ms as per Cavium specification */
+	DELAY(1000);
+
+	regval = thunder_pem_config_reg_read(sc, PCIERC_CFG032);
+
+	if (((regval & PEM_LINK_DLLA) == 0) || ((regval & PEM_LINK_LT) != 0)) {
+		device_printf(sc->dev, "PCIe RC: Port %d Link Timeout\n",
+		    sc->id);
+		return (ENXIO);
+	}
+
+	return (0);
+}
+
+static int
+thunder_pem_init(struct thunder_pem_softc *sc)
+{
+	int i, retval = 0;
+
+	retval = thunder_pem_link_init(sc);
+	if (retval) {
+		device_printf(sc->dev, "%s failed\n", __func__);
+		return retval;
+	}
+
+	retval = bus_space_map(sc->reg_bst, sc->sli_window_base,
+	    SLI_WINDOW_SIZE, 0, &sc->pem_sli_base);
+	if (retval) {
+		device_printf(sc->dev,
+		    "Unable to map RC%d pem_addr base address", sc->id);
+		return (ENOMEM);
+	}
+
+	/* To support 32-bit PCIe devices, set S2M_REGx_ACC[BA]=0x0 */
+	for (i = 0; i < SLI_ACC_REG_CNT; i++) {
+		thunder_pem_slix_s2m_regx_acc_modify(sc, sc->sli_group, i);
+	}
+
+	return (retval);
+}
+
+static uint64_t
+thunder_pem_config_reg_read(struct thunder_pem_softc *sc, int reg)
+{
+	uint64_t data;
+
+	/* Write to ADDR register */
+	bus_space_write_8(sc->reg_bst, sc->reg_bsh, PEM_CFG_RD,
+	    PEM_CFG_RD_REG_ALIGN(reg));
+	bus_space_barrier(sc->reg_bst, sc->reg_bsh, PEM_CFG_RD, 8,
+	    BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
+	/* Read from DATA register */
+	data = PEM_CFG_RD_REG_DATA(bus_space_read_8(sc->reg_bst, sc->reg_bsh,
+	    PEM_CFG_RD));
+
+	return (data);
+}
+
+static uint32_t
+thunder_pem_read_config(device_t dev, u_int bus, u_int slot,
+    u_int func, u_int reg, int bytes)
+{
+	uint64_t offset;
+	uint32_t data;
+	struct thunder_pem_softc *sc;
+	bus_space_tag_t	t;
+	bus_space_handle_t h;
+
+	if ((bus > PCI_BUSMAX) || (slot > PCI_SLOTMAX) ||
+	    (func > PCI_FUNCMAX) || (reg > PCIE_REGMAX))
+		return (~0U);
+
+	sc = device_get_softc(dev);
+
+	/* Calculate offset */
+	offset = (bus << PEM_BUS_SHIFT) | (slot << PEM_SLOT_SHIFT) |
+	    (func << PEM_FUNC_SHIFT) | reg;
+	t = sc->reg_bst;
+	h = sc->pem_sli_base;
+
+	switch (bytes) {
+	case 1:
+		data = bus_space_read_1(t, h, offset);
+		break;
+	case 2:
+		data = le16toh(bus_space_read_2(t, h, offset));
+		break;
+	case 4:
+		data = le32toh(bus_space_read_4(t, h, offset));
+		break;
+	default:
+		return (~0U);
+	}
+
+	return (data);
+}
+
+static void
+thunder_pem_write_config(device_t dev, u_int bus, u_int slot,
+    u_int func, u_int reg, uint32_t val, int bytes)
+{
+	uint64_t offset;
+	struct thunder_pem_softc *sc;
+	bus_space_tag_t	t;
+	bus_space_handle_t h;
+
+	if ((bus > PCI_BUSMAX) || (slot > PCI_SLOTMAX) ||
+	    (func > PCI_FUNCMAX) || (reg > PCIE_REGMAX))
+		return;
+
+	sc = device_get_softc(dev);
+
+	/* Calculate offset */
+	offset = (bus << PEM_BUS_SHIFT) | (slot << PEM_SLOT_SHIFT) |
+	    (func << PEM_FUNC_SHIFT) | reg;
+	t = sc->reg_bst;
+	h = sc->pem_sli_base;
+
+	switch (bytes) {
+	case 1:
+		bus_space_write_1(t, h, offset, val);
+		break;
+	case 2:
+		bus_space_write_2(t, h, offset, htole16(val));
+		break;
+	case 4:
+		bus_space_write_4(t, h, offset, htole32(val));
+		break;
+	default:
+		return;
+	}
+}
+
+static struct resource *
+thunder_pem_alloc_resource(device_t dev, device_t child, int type, int *rid,
+    u_long start, u_long end, u_long count, u_int flags)
+{
+	struct thunder_pem_softc *sc = device_get_softc(dev);
+	struct rman *rm = NULL;
+	struct resource *res;
+	device_t parent_dev;
+
+	switch (type) {
+	case SYS_RES_IOPORT:
+		rm = &sc->io_rman;
+		break;
+	case SYS_RES_MEMORY:
+		rm = &sc->mem_rman;
+		break;
+	default:
+		/* Find parent device. On ThunderX we know an exact path. */
+		parent_dev = device_get_parent(device_get_parent(dev));
+		return (BUS_ALLOC_RESOURCE(parent_dev, dev, type, rid, start,
+		    end, count, flags));
+	};
+
+	if ((start == 0UL) && (end == ~0UL)) {
+		device_printf(dev,
+		    "Cannot allocate resource with unspecified range\n");
+		goto fail;
+	}
+
+	/* Translate PCI address to host PHYS */
+	if (range_addr_is_pci(sc->ranges, start, count) == 0)
+		goto fail;
+	start = range_addr_pci_to_phys(sc->ranges, start);
+	end = start + count - 1;
+
+	if (bootverbose) {
+		device_printf(dev,
+		    "rman_reserve_resource: start=%#lx, end=%#lx, count=%#lx\n",
+		    start, end, count);
+	}
+
+	res = rman_reserve_resource(rm, start, end, count, flags, child);
+	if (res == NULL)
+		goto fail;
+
+	rman_set_rid(res, *rid);
+
+	if (flags & RF_ACTIVE)
+		if (bus_activate_resource(child, type, *rid, res)) {
+			rman_release_resource(res);
+			goto fail;
+		}
+
+	return (res);
+
+fail:
+	if (bootverbose) {
+		device_printf(dev, "%s FAIL: type=%d, rid=%d, "
+		    "start=%016lx, end=%016lx, count=%016lx, flags=%x\n",
+		    __func__, type, *rid, start, end, count, flags);
+	}
+
+	return (NULL);
+}
+
+static int
+thunder_pem_release_resource(device_t dev, device_t child, int type, int rid,
+    struct resource *res)
+{
+	device_t parent_dev;
+
+	/* Find parent device. On ThunderX we know an exact path. */
+	parent_dev = device_get_parent(device_get_parent(dev));
+
+	if ((type != SYS_RES_MEMORY) && (type != SYS_RES_IOPORT))
+		return (BUS_RELEASE_RESOURCE(parent_dev, child,
+		    type, rid, res));
+
+	return (rman_release_resource(res));
+}
+
+static int
+thunder_pem_probe(device_t dev)
+{
+	uint16_t pci_vendor_id;
+	uint16_t pci_device_id;
+
+	pci_vendor_id = pci_get_vendor(dev);
+	pci_device_id = pci_get_device(dev);
+
+	if ((pci_vendor_id == THUNDER_PEM_VENDOR_ID) &&
+	    (pci_device_id == THUNDER_PEM_DEVICE_ID)) {
+		device_set_desc_copy(dev, THUNDER_PEM_DESC);
+		return (0);
+	}
+
+	return (ENXIO);
+}
+
+static int
+thunder_pem_attach(device_t dev)
+{
+	struct thunder_pem_softc *sc;
+	int error;
+	int rid;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+
+	/* Allocate memory for BAR(0) */
+	rid = PCIR_BAR(0);
+	sc->reg = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+	    &rid, RF_ACTIVE);
+	if (sc->reg == NULL) {
+		device_printf(dev, "Failed to allocate resource\n");
+		return (ENXIO);
+	}
+	sc->reg_bst = rman_get_bustag(sc->reg);
+	sc->reg_bsh = rman_get_bushandle(sc->reg);
+
+	/* Map SLI, do it only once */
+	if (!sli0_s2m_regx_base) {
+		bus_space_map(sc->reg_bst, SLIX_S2M_REGX_ACC,
+		    SLIX_S2M_REGX_ACC_SIZE, 0, &sli0_s2m_regx_base);
+	}
+	if (!sli1_s2m_regx_base) {
+		bus_space_map(sc->reg_bst, SLIX_S2M_REGX_ACC +
+		    SLIX_S2M_REGX_ACC_SPACING, SLIX_S2M_REGX_ACC_SIZE, 0,
+		    &sli1_s2m_regx_base);
+	}
+
+	if ((sli0_s2m_regx_base == 0) || (sli1_s2m_regx_base == 0)) {
+		device_printf(dev,
+		    "bus_space_map failed to map slix_s2m_regx_base\n");
+		goto fail;
+	}
+
+	/* Identify PEM */
+	if (thunder_pem_identify(dev) != 0)
+		goto fail;
+
+	/* Initialize rman and allocate regions */
+	sc->mem_rman.rm_type = RMAN_ARRAY;
+	sc->mem_rman.rm_descr = "PEM PCIe Memory";
+	error = rman_init(&sc->mem_rman);
+	if (error != 0) {
+		device_printf(dev, "memory rman_init() failed. error = %d\n",
+		    error);
+		goto fail;
+	}
+	sc->io_rman.rm_type = RMAN_ARRAY;
+	sc->io_rman.rm_descr = "PEM PCIe IO";
+	error = rman_init(&sc->io_rman);
+	if (error != 0) {
+		device_printf(dev, "IO rman_init() failed. error = %d\n",
+		    error);
+		goto fail_mem;
+	}
+
+	/* Fill memory window */
+	sc->ranges[0].pci_base = PCI_MEMORY_BASE;
+	sc->ranges[0].size = PCI_MEMORY_SIZE;
+	sc->ranges[0].phys_base = sc->sli_window_base + SLI_PCI_OFFSET +
+	    sc->ranges[0].pci_base;
+	rman_manage_region(&sc->mem_rman, sc->ranges[0].phys_base,
+	    sc->ranges[0].phys_base + sc->ranges[0].size - 1);
+
+	/* Fill IO window */
+	sc->ranges[1].pci_base = PCI_IO_BASE;
+	sc->ranges[1].size = PCI_IO_SIZE;
+	sc->ranges[1].phys_base = sc->sli_window_base + SLI_PCI_OFFSET +
+	    sc->ranges[1].pci_base;
+	rman_manage_region(&sc->io_rman, sc->ranges[1].phys_base,
+	    sc->ranges[1].phys_base + sc->ranges[1].size - 1);
+
+	if (thunder_pem_init(sc)) {
+		device_printf(dev, "Failure during PEM init\n");
+		goto fail_io;
+	}
+
+	device_add_child(dev, "pci", -1);
+
+	return (bus_generic_attach(dev));
+
+fail_io:
+	rman_fini(&sc->io_rman);
+fail_mem:
+	rman_fini(&sc->mem_rman);
+fail:
+	bus_free_resource(dev, SYS_RES_MEMORY, sc->reg);
+	return (ENXIO);
+}
+
+static void
+thunder_pem_release_all(device_t dev)
+{
+	struct thunder_pem_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	rman_fini(&sc->io_rman);
+	rman_fini(&sc->mem_rman);
+
+	if (sc->reg != NULL)
+		bus_free_resource(dev, SYS_RES_MEMORY, sc->reg);
+}
+
+static int
+thunder_pem_detach(device_t dev)
+{
+
+	thunder_pem_release_all(dev);
+
+	return (0);
+}
+
+static devclass_t thunder_pem_devclass;
+
+DRIVER_MODULE(thunder_pem, pci, thunder_pem_driver, thunder_pem_devclass, 0, 0);
+MODULE_DEPEND(thunder_pem, pci, 1, 1, 1);
diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
index 4bd762f..72db562 100644
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -51,6 +51,7 @@ arm64/arm64/unwind.c		optional	ddb | kdtrace_hooks | stack
 arm64/arm64/vfp.c		standard
 arm64/arm64/vm_machdep.c	standard
 arm64/cavium/thunder_pcie.c	optional	thunder_pci fdt
+arm64/cavium/thunder_pcie_pem.c	optional	thunder_pci
 arm64/cavium/thunder_pcie_common.c	optional	thunder_pci
 crypto/blowfish/bf_enc.c	optional	crypto | ipsec
 crypto/des/des_enc.c		optional	crypto | ipsec | netsmb