hw/pci-host/xilinx-pcie.c - qemu - Git at Google

 /*
  * Xilinx PCIe host controller emulation.
  *
  * Copyright (c) 2016 Imagination Technologies
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "qemu/units.h"
 #include "qapi/error.h"
 #include "hw/pci/pci_bridge.h"
 #include "hw/qdev-properties.h"
 #include "hw/irq.h"
 #include "hw/pci-host/xilinx-pcie.h"

 enum root_cfg_reg {
     /* Interrupt Decode Register */
     ROOTCFG_INTDEC              = 0x138,

     /* Interrupt Mask Register */
     ROOTCFG_INTMASK             = 0x13c,
     /* INTx Interrupt Received */
 #define ROOTCFG_INTMASK_INTX    (1 << 16)
     /* MSI Interrupt Received */
 #define ROOTCFG_INTMASK_MSI     (1 << 17)

     /* PHY Status/Control Register */
     ROOTCFG_PSCR                = 0x144,
     /* Link Up */
 #define ROOTCFG_PSCR_LINK_UP    (1 << 11)

     /* Root Port Status/Control Register */
     ROOTCFG_RPSCR               = 0x148,
     /* Bridge Enable */
 #define ROOTCFG_RPSCR_BRIDGEEN  (1 << 0)
     /* Interrupt FIFO Not Empty */
 #define ROOTCFG_RPSCR_INTNEMPTY (1 << 18)
     /* Interrupt FIFO Overflow */
 #define ROOTCFG_RPSCR_INTOVF    (1 << 19)

     /* Root Port Interrupt FIFO Read Register 1 */
     ROOTCFG_RPIFR1              = 0x158,
 #define ROOTCFG_RPIFR1_INT_LANE_SHIFT   27
 #define ROOTCFG_RPIFR1_INT_ASSERT_SHIFT 29
 #define ROOTCFG_RPIFR1_INT_VALID_SHIFT  31
     /* Root Port Interrupt FIFO Read Register 2 */
     ROOTCFG_RPIFR2              = 0x15c,
 };

 static void xilinx_pcie_update_intr(XilinxPCIEHost *s,
                                     uint32_t set, uint32_t clear)
 {
     int level;

     s->intr |= set;
     s->intr &= ~clear;

     if (s->intr_fifo_r != s->intr_fifo_w) {
         s->intr |= ROOTCFG_INTMASK_INTX;
     }

     level = !!(s->intr & s->intr_mask);
     qemu_set_irq(s->irq, level);
 }

 static void xilinx_pcie_queue_intr(XilinxPCIEHost *s,
                                    uint32_t fifo_reg1, uint32_t fifo_reg2)
 {
     XilinxPCIEInt *intr;
     unsigned int new_w;

     new_w = (s->intr_fifo_w + 1) % ARRAY_SIZE(s->intr_fifo);
     if (new_w == s->intr_fifo_r) {
         s->rpscr |= ROOTCFG_RPSCR_INTOVF;
         return;
     }

     intr = &s->intr_fifo[s->intr_fifo_w];
     s->intr_fifo_w = new_w;

     intr->fifo_reg1 = fifo_reg1;
     intr->fifo_reg2 = fifo_reg2;

     xilinx_pcie_update_intr(s, ROOTCFG_INTMASK_INTX, 0);
 }

 static void xilinx_pcie_set_irq(void *opaque, int irq_num, int level)
 {
     XilinxPCIEHost *s = XILINX_PCIE_HOST(opaque);

     xilinx_pcie_queue_intr(s,
        (irq_num << ROOTCFG_RPIFR1_INT_LANE_SHIFT) |
            (level << ROOTCFG_RPIFR1_INT_ASSERT_SHIFT) |
            (1 << ROOTCFG_RPIFR1_INT_VALID_SHIFT),
        0);
 }

 static void xilinx_pcie_host_realize(DeviceState *dev, Error **errp)
 {
     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
     XilinxPCIEHost *s = XILINX_PCIE_HOST(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev);

     snprintf(s->name, sizeof(s->name), "pcie%u", s->bus_nr);

     /* PCI configuration space */
     pcie_host_mmcfg_init(pex, s->cfg_size);

     /* MMIO region */
     memory_region_init(&s->mmio, OBJECT(s), "mmio", UINT64_MAX);
     memory_region_set_enabled(&s->mmio, false);

     /* dummy PCI I/O region (not visible to the CPU) */
     memory_region_init(&s->io, OBJECT(s), "io", 16);

     /* interrupt out */
     qdev_init_gpio_out_named(dev, &s->irq, "interrupt_out", 1);

     sysbus_init_mmio(sbd, &pex->mmio);
     sysbus_init_mmio(sbd, &s->mmio);

     pci->bus = pci_register_root_bus(dev, s->name, xilinx_pcie_set_irq,
                                      pci_swizzle_map_irq_fn, s, &s->mmio,
                                      &s->io, 0, 4, TYPE_PCIE_BUS);

     qdev_realize(DEVICE(&s->root), BUS(pci->bus), &error_fatal);
 }

 static const char *xilinx_pcie_host_root_bus_path(PCIHostState *host_bridge,
                                                   PCIBus *rootbus)
 {
     return "0000:00";
 }

 static void xilinx_pcie_host_init(Object *obj)
 {
     XilinxPCIEHost *s = XILINX_PCIE_HOST(obj);
     XilinxPCIERoot *root = &s->root;

     object_initialize_child(obj, "root", root, TYPE_XILINX_PCIE_ROOT);
     qdev_prop_set_int32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
     qdev_prop_set_bit(DEVICE(root), "multifunction", false);
 }

 static Property xilinx_pcie_host_props[] = {
     DEFINE_PROP_UINT32("bus_nr", XilinxPCIEHost, bus_nr, 0),
     DEFINE_PROP_SIZE("cfg_base", XilinxPCIEHost, cfg_base, 0),
     DEFINE_PROP_SIZE("cfg_size", XilinxPCIEHost, cfg_size, 32 * MiB),
     DEFINE_PROP_SIZE("mmio_base", XilinxPCIEHost, mmio_base, 0),
     DEFINE_PROP_SIZE("mmio_size", XilinxPCIEHost, mmio_size, 1 * MiB),
     DEFINE_PROP_BOOL("link_up", XilinxPCIEHost, link_up, true),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void xilinx_pcie_host_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);

     hc->root_bus_path = xilinx_pcie_host_root_bus_path;
     dc->realize = xilinx_pcie_host_realize;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     dc->fw_name = "pci";
     device_class_set_props(dc, xilinx_pcie_host_props);
 }

 static const TypeInfo xilinx_pcie_host_info = {
     .name       = TYPE_XILINX_PCIE_HOST,
     .parent     = TYPE_PCIE_HOST_BRIDGE,
     .instance_size = sizeof(XilinxPCIEHost),
     .instance_init = xilinx_pcie_host_init,
     .class_init = xilinx_pcie_host_class_init,
 };

 static uint32_t xilinx_pcie_root_config_read(PCIDevice *d,
                                              uint32_t address, int len)
 {
     XilinxPCIEHost *s = XILINX_PCIE_HOST(OBJECT(d)->parent);
     uint32_t val;

     switch (address) {
     case ROOTCFG_INTDEC:
         val = s->intr;
         break;
     case ROOTCFG_INTMASK:
         val = s->intr_mask;
         break;
     case ROOTCFG_PSCR:
         val = s->link_up ? ROOTCFG_PSCR_LINK_UP : 0;
         break;
     case ROOTCFG_RPSCR:
         if (s->intr_fifo_r != s->intr_fifo_w) {
             s->rpscr &= ~ROOTCFG_RPSCR_INTNEMPTY;
         } else {
             s->rpscr |= ROOTCFG_RPSCR_INTNEMPTY;
         }
         val = s->rpscr;
         break;
     case ROOTCFG_RPIFR1:
         if (s->intr_fifo_w == s->intr_fifo_r) {
             /* FIFO empty */
             val = 0;
         } else {
             val = s->intr_fifo[s->intr_fifo_r].fifo_reg1;
         }
         break;
     case ROOTCFG_RPIFR2:
         if (s->intr_fifo_w == s->intr_fifo_r) {
             /* FIFO empty */
             val = 0;
         } else {
             val = s->intr_fifo[s->intr_fifo_r].fifo_reg2;
         }
         break;
     default:
         val = pci_default_read_config(d, address, len);
         break;
     }
     return val;
 }

 static void xilinx_pcie_root_config_write(PCIDevice *d, uint32_t address,
                                           uint32_t val, int len)
 {
     XilinxPCIEHost *s = XILINX_PCIE_HOST(OBJECT(d)->parent);
     switch (address) {
     case ROOTCFG_INTDEC:
         xilinx_pcie_update_intr(s, 0, val);
         break;
     case ROOTCFG_INTMASK:
         s->intr_mask = val;
         xilinx_pcie_update_intr(s, 0, 0);
         break;
     case ROOTCFG_RPSCR:
         s->rpscr &= ~ROOTCFG_RPSCR_BRIDGEEN;
         s->rpscr |= val & ROOTCFG_RPSCR_BRIDGEEN;
         memory_region_set_enabled(&s->mmio, val & ROOTCFG_RPSCR_BRIDGEEN);

         if (val & ROOTCFG_INTMASK_INTX) {
             s->rpscr &= ~ROOTCFG_INTMASK_INTX;
         }
         break;
     case ROOTCFG_RPIFR1:
     case ROOTCFG_RPIFR2:
         if (s->intr_fifo_w == s->intr_fifo_r) {
             /* FIFO empty */
             return;
         } else {
             s->intr_fifo_r = (s->intr_fifo_r + 1) % ARRAY_SIZE(s->intr_fifo);
         }
         break;
     default:
         pci_default_write_config(d, address, val, len);
         break;
     }
 }

 static void xilinx_pcie_root_realize(PCIDevice *pci_dev, Error **errp)
 {
     BusState *bus = qdev_get_parent_bus(DEVICE(pci_dev));
     XilinxPCIEHost *s = XILINX_PCIE_HOST(bus->parent);

     pci_set_word(pci_dev->config + PCI_COMMAND,
                  PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
     pci_set_word(pci_dev->config + PCI_MEMORY_BASE, s->mmio_base >> 16);
     pci_set_word(pci_dev->config + PCI_MEMORY_LIMIT,
                  ((s->mmio_base + s->mmio_size - 1) >> 16) & 0xfff0);

     pci_bridge_initfn(pci_dev, TYPE_PCI_BUS);

     if (pcie_endpoint_cap_v1_init(pci_dev, 0x80) < 0) {
         error_setg(errp, "Failed to initialize PCIe capability");
     }
 }

 static void xilinx_pcie_root_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);

     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     dc->desc = "Xilinx AXI-PCIe Host Bridge";
     k->vendor_id = PCI_VENDOR_ID_XILINX;
     k->device_id = 0x7021;
     k->revision = 0;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
     k->is_bridge = true;
     k->realize = xilinx_pcie_root_realize;
     k->exit = pci_bridge_exitfn;
     dc->reset = pci_bridge_reset;
     k->config_read = xilinx_pcie_root_config_read;
     k->config_write = xilinx_pcie_root_config_write;
     /*
      * PCI-facing part of the host bridge, not usable without the
      * host-facing part, which can't be device_add'ed, yet.
      */
     dc->user_creatable = false;
 }

 static const TypeInfo xilinx_pcie_root_info = {
     .name = TYPE_XILINX_PCIE_ROOT,
     .parent = TYPE_PCI_BRIDGE,
     .instance_size = sizeof(XilinxPCIERoot),
     .class_init = xilinx_pcie_root_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_PCIE_DEVICE },
         { }
     },
 };

 static void xilinx_pcie_register(void)
 {
     type_register_static(&xilinx_pcie_root_info);
     type_register_static(&xilinx_pcie_host_info);
 }

 type_init(xilinx_pcie_register)
	/*
	* Xilinx PCIe host controller emulation.
	*
	* Copyright (c) 2016 Imagination Technologies
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "qemu/module.h"
	#include "qemu/units.h"
	#include "qapi/error.h"
	#include "hw/pci/pci_bridge.h"
	#include "hw/qdev-properties.h"
	#include "hw/irq.h"
	#include "hw/pci-host/xilinx-pcie.h"

	enum root_cfg_reg {
	/* Interrupt Decode Register */
	ROOTCFG_INTDEC = 0x138,

	/* Interrupt Mask Register */
	ROOTCFG_INTMASK = 0x13c,
	/* INTx Interrupt Received */
	#define ROOTCFG_INTMASK_INTX (1 << 16)
	/* MSI Interrupt Received */
	#define ROOTCFG_INTMASK_MSI (1 << 17)

	/* PHY Status/Control Register */
	ROOTCFG_PSCR = 0x144,
	/* Link Up */
	#define ROOTCFG_PSCR_LINK_UP (1 << 11)

	/* Root Port Status/Control Register */
	ROOTCFG_RPSCR = 0x148,
	/* Bridge Enable */
	#define ROOTCFG_RPSCR_BRIDGEEN (1 << 0)
	/* Interrupt FIFO Not Empty */
	#define ROOTCFG_RPSCR_INTNEMPTY (1 << 18)
	/* Interrupt FIFO Overflow */
	#define ROOTCFG_RPSCR_INTOVF (1 << 19)

	/* Root Port Interrupt FIFO Read Register 1 */
	ROOTCFG_RPIFR1 = 0x158,
	#define ROOTCFG_RPIFR1_INT_LANE_SHIFT 27
	#define ROOTCFG_RPIFR1_INT_ASSERT_SHIFT 29
	#define ROOTCFG_RPIFR1_INT_VALID_SHIFT 31
	/* Root Port Interrupt FIFO Read Register 2 */
	ROOTCFG_RPIFR2 = 0x15c,
	};

	static void xilinx_pcie_update_intr(XilinxPCIEHost *s,
	uint32_t set, uint32_t clear)
	{
	int level;

	s->intr \|= set;
	s->intr &= ~clear;

	if (s->intr_fifo_r != s->intr_fifo_w) {
	s->intr \|= ROOTCFG_INTMASK_INTX;
	}

	level = !!(s->intr & s->intr_mask);
	qemu_set_irq(s->irq, level);
	}

	static void xilinx_pcie_queue_intr(XilinxPCIEHost *s,
	uint32_t fifo_reg1, uint32_t fifo_reg2)
	{
	XilinxPCIEInt *intr;
	unsigned int new_w;

	new_w = (s->intr_fifo_w + 1) % ARRAY_SIZE(s->intr_fifo);
	if (new_w == s->intr_fifo_r) {
	s->rpscr \|= ROOTCFG_RPSCR_INTOVF;
	return;
	}

	intr = &s->intr_fifo[s->intr_fifo_w];
	s->intr_fifo_w = new_w;

	intr->fifo_reg1 = fifo_reg1;
	intr->fifo_reg2 = fifo_reg2;

	xilinx_pcie_update_intr(s, ROOTCFG_INTMASK_INTX, 0);
	}

	static void xilinx_pcie_set_irq(void *opaque, int irq_num, int level)
	{
	XilinxPCIEHost *s = XILINX_PCIE_HOST(opaque);

	xilinx_pcie_queue_intr(s,
	(irq_num << ROOTCFG_RPIFR1_INT_LANE_SHIFT) \|
	(level << ROOTCFG_RPIFR1_INT_ASSERT_SHIFT) \|
	(1 << ROOTCFG_RPIFR1_INT_VALID_SHIFT),
	0);
	}

	static void xilinx_pcie_host_realize(DeviceState dev, Error *errp)
	{
	PCIHostState *pci = PCI_HOST_BRIDGE(dev);
	XilinxPCIEHost *s = XILINX_PCIE_HOST(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev);

	snprintf(s->name, sizeof(s->name), "pcie%u", s->bus_nr);

	/* PCI configuration space */
	pcie_host_mmcfg_init(pex, s->cfg_size);

	/* MMIO region */
	memory_region_init(&s->mmio, OBJECT(s), "mmio", UINT64_MAX);
	memory_region_set_enabled(&s->mmio, false);

	/* dummy PCI I/O region (not visible to the CPU) */
	memory_region_init(&s->io, OBJECT(s), "io", 16);

	/* interrupt out */
	qdev_init_gpio_out_named(dev, &s->irq, "interrupt_out", 1);

	sysbus_init_mmio(sbd, &pex->mmio);
	sysbus_init_mmio(sbd, &s->mmio);

	pci->bus = pci_register_root_bus(dev, s->name, xilinx_pcie_set_irq,
	pci_swizzle_map_irq_fn, s, &s->mmio,
	&s->io, 0, 4, TYPE_PCIE_BUS);

	qdev_realize(DEVICE(&s->root), BUS(pci->bus), &error_fatal);
	}

	static const char xilinx_pcie_host_root_bus_path(PCIHostState host_bridge,
	PCIBus *rootbus)
	{
	return "0000:00";
	}

	static void xilinx_pcie_host_init(Object *obj)
	{
	XilinxPCIEHost *s = XILINX_PCIE_HOST(obj);
	XilinxPCIERoot *root = &s->root;

	object_initialize_child(obj, "root", root, TYPE_XILINX_PCIE_ROOT);
	qdev_prop_set_int32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
	qdev_prop_set_bit(DEVICE(root), "multifunction", false);
	}

	static Property xilinx_pcie_host_props[] = {
	DEFINE_PROP_UINT32("bus_nr", XilinxPCIEHost, bus_nr, 0),
	DEFINE_PROP_SIZE("cfg_base", XilinxPCIEHost, cfg_base, 0),
	DEFINE_PROP_SIZE("cfg_size", XilinxPCIEHost, cfg_size, 32 * MiB),
	DEFINE_PROP_SIZE("mmio_base", XilinxPCIEHost, mmio_base, 0),
	DEFINE_PROP_SIZE("mmio_size", XilinxPCIEHost, mmio_size, 1 * MiB),
	DEFINE_PROP_BOOL("link_up", XilinxPCIEHost, link_up, true),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void xilinx_pcie_host_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);

	hc->root_bus_path = xilinx_pcie_host_root_bus_path;
	dc->realize = xilinx_pcie_host_realize;
	set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
	dc->fw_name = "pci";
	device_class_set_props(dc, xilinx_pcie_host_props);
	}

	static const TypeInfo xilinx_pcie_host_info = {
	.name = TYPE_XILINX_PCIE_HOST,
	.parent = TYPE_PCIE_HOST_BRIDGE,
	.instance_size = sizeof(XilinxPCIEHost),
	.instance_init = xilinx_pcie_host_init,
	.class_init = xilinx_pcie_host_class_init,
	};

	static uint32_t xilinx_pcie_root_config_read(PCIDevice *d,
	uint32_t address, int len)
	{
	XilinxPCIEHost *s = XILINX_PCIE_HOST(OBJECT(d)->parent);
	uint32_t val;

	switch (address) {
	case ROOTCFG_INTDEC:
	val = s->intr;
	break;
	case ROOTCFG_INTMASK:
	val = s->intr_mask;
	break;
	case ROOTCFG_PSCR:
	val = s->link_up ? ROOTCFG_PSCR_LINK_UP : 0;
	break;
	case ROOTCFG_RPSCR:
	if (s->intr_fifo_r != s->intr_fifo_w) {
	s->rpscr &= ~ROOTCFG_RPSCR_INTNEMPTY;
	} else {
	s->rpscr \|= ROOTCFG_RPSCR_INTNEMPTY;
	}
	val = s->rpscr;
	break;
	case ROOTCFG_RPIFR1:
	if (s->intr_fifo_w == s->intr_fifo_r) {
	/* FIFO empty */
	val = 0;
	} else {
	val = s->intr_fifo[s->intr_fifo_r].fifo_reg1;
	}
	break;
	case ROOTCFG_RPIFR2:
	if (s->intr_fifo_w == s->intr_fifo_r) {
	/* FIFO empty */
	val = 0;
	} else {
	val = s->intr_fifo[s->intr_fifo_r].fifo_reg2;
	}
	break;
	default:
	val = pci_default_read_config(d, address, len);
	break;
	}
	return val;
	}

	static void xilinx_pcie_root_config_write(PCIDevice *d, uint32_t address,
	uint32_t val, int len)
	{
	XilinxPCIEHost *s = XILINX_PCIE_HOST(OBJECT(d)->parent);
	switch (address) {
	case ROOTCFG_INTDEC:
	xilinx_pcie_update_intr(s, 0, val);
	break;
	case ROOTCFG_INTMASK:
	s->intr_mask = val;
	xilinx_pcie_update_intr(s, 0, 0);
	break;
	case ROOTCFG_RPSCR:
	s->rpscr &= ~ROOTCFG_RPSCR_BRIDGEEN;
	s->rpscr \|= val & ROOTCFG_RPSCR_BRIDGEEN;
	memory_region_set_enabled(&s->mmio, val & ROOTCFG_RPSCR_BRIDGEEN);

	if (val & ROOTCFG_INTMASK_INTX) {
	s->rpscr &= ~ROOTCFG_INTMASK_INTX;
	}
	break;
	case ROOTCFG_RPIFR1:
	case ROOTCFG_RPIFR2:
	if (s->intr_fifo_w == s->intr_fifo_r) {
	/* FIFO empty */
	return;
	} else {
	s->intr_fifo_r = (s->intr_fifo_r + 1) % ARRAY_SIZE(s->intr_fifo);
	}
	break;
	default:
	pci_default_write_config(d, address, val, len);
	break;
	}
	}

	static void xilinx_pcie_root_realize(PCIDevice pci_dev, Error *errp)
	{
	BusState *bus = qdev_get_parent_bus(DEVICE(pci_dev));
	XilinxPCIEHost *s = XILINX_PCIE_HOST(bus->parent);

	pci_set_word(pci_dev->config + PCI_COMMAND,
	PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER);
	pci_set_word(pci_dev->config + PCI_MEMORY_BASE, s->mmio_base >> 16);
	pci_set_word(pci_dev->config + PCI_MEMORY_LIMIT,
	((s->mmio_base + s->mmio_size - 1) >> 16) & 0xfff0);

	pci_bridge_initfn(pci_dev, TYPE_PCI_BUS);

	if (pcie_endpoint_cap_v1_init(pci_dev, 0x80) < 0) {
	error_setg(errp, "Failed to initialize PCIe capability");
	}
	}

	static void xilinx_pcie_root_class_init(ObjectClass klass, void data)
	{
	PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
	DeviceClass *dc = DEVICE_CLASS(klass);

	set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
	dc->desc = "Xilinx AXI-PCIe Host Bridge";
	k->vendor_id = PCI_VENDOR_ID_XILINX;
	k->device_id = 0x7021;
	k->revision = 0;
	k->class_id = PCI_CLASS_BRIDGE_HOST;
	k->is_bridge = true;
	k->realize = xilinx_pcie_root_realize;
	k->exit = pci_bridge_exitfn;
	dc->reset = pci_bridge_reset;
	k->config_read = xilinx_pcie_root_config_read;
	k->config_write = xilinx_pcie_root_config_write;
	/*
	* PCI-facing part of the host bridge, not usable without the
	* host-facing part, which can't be device_add'ed, yet.
	*/
	dc->user_creatable = false;
	}

	static const TypeInfo xilinx_pcie_root_info = {
	.name = TYPE_XILINX_PCIE_ROOT,
	.parent = TYPE_PCI_BRIDGE,
	.instance_size = sizeof(XilinxPCIERoot),
	.class_init = xilinx_pcie_root_class_init,
	.interfaces = (InterfaceInfo[]) {
	{ INTERFACE_PCIE_DEVICE },
	{ }
	},
	};

	static void xilinx_pcie_register(void)
	{
	type_register_static(&xilinx_pcie_root_info);
	type_register_static(&xilinx_pcie_host_info);
	}

	type_init(xilinx_pcie_register)