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-rw-r--r--hw/pci-host/xilinx-pcie.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/hw/pci-host/xilinx-pcie.c b/hw/pci-host/xilinx-pcie.c
new file mode 100644
index 00000000..38d5901a
--- /dev/null
+++ b/hw/pci-host/xilinx-pcie.c
@@ -0,0 +1,331 @@
+/*
+ * 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)
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-28 07:40:47 +0000