From: Titus Rwantare <titusr@google.com>
create a basic device to introduce the root complex registers and
respond to its mmio configuration accesses
Signed-off-by: Titus Rwantare <titusr@google.com>
---
hw/pci-host/Kconfig | 4 +
hw/pci-host/meson.build | 1 +
hw/pci-host/npcm_pcierc.c | 164 ++++++++++++++++++++++++++++++++++++++
hw/pci-host/trace-events | 4 +
include/hw/pci-host/npcm_pcierc.h | 55 +++++++++++++
5 files changed, 228 insertions(+)
diff --git a/hw/pci-host/Kconfig b/hw/pci-host/Kconfig
index 9824fa188d6b8865dcf7b069f2c16f269b211aa0..1d726b6e05c732b69e22aa2883892aaeaed129fa 100644
--- a/hw/pci-host/Kconfig
+++ b/hw/pci-host/Kconfig
@@ -108,3 +108,7 @@ config GT64120
select PCI
select EMPTY_SLOT
select I8259
+
+config NPCM_PCIERC
+ bool
+ select PCI_EXPRESS
diff --git a/hw/pci-host/meson.build b/hw/pci-host/meson.build
index 937a0f72acf940f963fc683ab52a5f8b80657ca3..2c0a49cbc5102110f7d92e279df1ad4654570332 100644
--- a/hw/pci-host/meson.build
+++ b/hw/pci-host/meson.build
@@ -30,6 +30,7 @@ pci_ss.add(when: 'CONFIG_MV64361', if_true: files('mv64361.c'))
# ARM devices
pci_ss.add(when: 'CONFIG_PCI_EXPRESS_FSL_IMX8M_PHY', if_true: files('fsl_imx8m_phy.c'))
pci_ss.add(when: 'CONFIG_VERSATILE_PCI', if_true: files('versatile.c'))
+pci_ss.add(when: 'CONFIG_NPCM_PCIERC', if_true: files('npcm_pcierc.c'))
# HPPA devices
specific_ss.add(when: 'CONFIG_ASTRO', if_true: files('astro.c'))
diff --git a/hw/pci-host/npcm_pcierc.c b/hw/pci-host/npcm_pcierc.c
new file mode 100644
index 0000000000000000000000000000000000000000..3afe92e264f6ce4312e94f05b5e908840008df64
--- /dev/null
+++ b/hw/pci-host/npcm_pcierc.c
@@ -0,0 +1,164 @@
+/*
+ * Nuvoton PCIe Root complex
+ *
+ * Copyright 2022 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "hw/irq.h"
+#include "hw/qdev-properties.h"
+#include "hw/pci-host/npcm_pcierc.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "qemu/units.h"
+#include "qom/object.h"
+#include "trace.h"
+
+static uint64_t npcm_pcierc_cfg_read(void *opaque, hwaddr addr, unsigned size)
+{
+ NPCMPCIERCState *s = NPCM_PCIERC(opaque);
+ uint32_t ret = -1;
+
+ switch (addr) {
+ case NPCM_PCIERC_RCCFGNUM:
+ ret = s->rccfgnum;
+ break;
+
+ case NPCM_PCIERC_INTEN:
+ ret = s->rcinten;
+ break;
+
+ case NPCM_PCIERC_INTST:
+ ret = s->rcintstat;
+ break;
+
+ case NPCM_PCIERC_IMSI_ADDR:
+ ret = s->rcimsiaddr;
+ break;
+
+ case NPCM_PCIERC_MSISTAT:
+ ret = s->rcmsisstat;
+ break;
+
+ case NPCM_PCIERC_AXI_ERROR_REPORT:
+ ret = s->axierr;
+ break;
+
+ default:
+ qemu_log_mask(LOG_UNIMP,
+ "%s: read from unimplemented register 0x%04lx\n",
+ __func__, addr);
+ ret = -1;
+ break;
+ }
+ trace_npcm_pcierc_read(addr, size, ret);
+ return ret;
+}
+
+static void npcm_pcierc_cfg_write(void *opaque, hwaddr addr, uint64_t data,
+ unsigned size)
+{
+ NPCMPCIERCState *s = NPCM_PCIERC(opaque);
+
+ trace_npcm_pcierc_write(addr, size, data);
+ switch (addr) {
+ case NPCM_PCIERC_RCCFGNUM:
+ s->rccfgnum = data;
+ break;
+
+ case NPCM_PCIERC_INTEN:
+ s->rcinten = data;
+ break;
+
+ case NPCM_PCIERC_INTST:
+ s->rcintstat &= ~data;
+ break;
+
+ case NPCM_PCIERC_IMSI_ADDR:
+ s->rcimsiaddr = data;
+ break;
+
+ case NPCM_PCIERC_MSISTAT:
+ s->rcmsisstat &= ~data;
+ break;
+
+ case NPCM_PCIERC_AXI_ERROR_REPORT:
+ s->axierr = data;
+ break;
+
+ default:
+ qemu_log_mask(LOG_UNIMP,
+ "%s: write to unimplemented reg 0x%04lx data: 0x%lx\n",
+ __func__, addr, data);
+ break;
+ }
+}
+
+static void npcm_pcierc_reset(Object *obj, ResetType type)
+{
+ NPCMPCIERCState *s = NPCM_PCIERC(obj);
+
+ s->rccfgnum = 0;
+ s->rcinten = 0;
+ s->rcintstat = 0;
+ s->rcimsiaddr = 0;
+ s->rcmsisstat = 0;
+ s->axierr = 0;
+}
+
+static const char *npcm_pcierc_root_bus_path(PCIHostState *host_bridge,
+ PCIBus *rootbus)
+{
+ return "0000:00";
+}
+
+static const MemoryRegionOps npcm_pcierc_cfg_ops = {
+ .read = npcm_pcierc_cfg_read,
+ .write = npcm_pcierc_cfg_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ .unaligned = false,
+ },
+};
+
+static void npcm_pcierc_realize(DeviceState *dev, Error **errp)
+{
+ NPCMPCIERCState *s = NPCM_PCIERC(dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+ memory_region_init_io(&s->mmio, OBJECT(s), &npcm_pcierc_cfg_ops,
+ s, TYPE_NPCM_PCIERC, 4 * KiB);
+ sysbus_init_mmio(sbd, &s->mmio);
+ sysbus_init_irq(sbd, &s->irq);
+}
+
+static void npcm_pcierc_class_init(ObjectClass *klass, const void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIHostBridgeClass *hbc = PCI_HOST_BRIDGE_CLASS(klass);
+ ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+ hbc->root_bus_path = npcm_pcierc_root_bus_path;
+ dc->realize = npcm_pcierc_realize;
+ rc->phases.enter = npcm_pcierc_reset;
+ set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+ dc->fw_name = "pci";
+}
+
+static const TypeInfo npcm_pcierc_type_info = {
+ .name = TYPE_NPCM_PCIERC,
+ .parent = TYPE_PCIE_HOST_BRIDGE,
+ .instance_size = sizeof(NPCMPCIERCState),
+ .class_init = npcm_pcierc_class_init,
+};
+
+static void npcm_pcierc_register_types(void)
+{
+ type_register_static(&npcm_pcierc_type_info);
+}
+
+type_init(npcm_pcierc_register_types)
diff --git a/hw/pci-host/trace-events b/hw/pci-host/trace-events
index 0a816b9aa129bb0c37d207e2612e09ac4762d51a..e4794f687177ee90fe4d33194b484c83a34dcaf9 100644
--- a/hw/pci-host/trace-events
+++ b/hw/pci-host/trace-events
@@ -69,3 +69,7 @@ elroy_pci_config_data_read(uint64_t addr, int size, uint64_t val) "addr 0x%"PRIx
elroy_pci_config_data_write(uint64_t addr, int size, uint64_t val) "addr 0x%"PRIx64" size %d val 0x%"PRIx64
iosapic_reg_write(uint64_t reg_select, int size, uint64_t val) "reg_select 0x%"PRIx64" size %d val 0x%"PRIx64
iosapic_reg_read(uint64_t reg_select, int size, uint64_t val) "reg_select 0x%"PRIx64" size %d val 0x%"PRIx64
+
+# npmc_pcierc.c
+npcm_pcierc_read(uint64_t offset, uint32_t size, uint64_t data) "offset: 0x%" PRIx64 " size: %d data: 0x%" PRIx64
+npcm_pcierc_write(uint64_t offset, uint32_t size, uint64_t data) "offset: 0x%" PRIx64 " size: %d data: 0x%" PRIx64
diff --git a/include/hw/pci-host/npcm_pcierc.h b/include/hw/pci-host/npcm_pcierc.h
new file mode 100644
index 0000000000000000000000000000000000000000..2c817147d495fdc1d1fa4b389bad0469fd6a825e
--- /dev/null
+++ b/include/hw/pci-host/npcm_pcierc.h
@@ -0,0 +1,55 @@
+/*
+ * Nuvoton PCIe Root complex
+ *
+ * Copyright 2022 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * The PCIERC configuration registers must be initialised by the BMC kernel
+ * during boot for PCIe to function
+ * - A single window from the PCIe to the Memory controller
+ * - 4 windows from the BMC to the PCIe.
+ * 1 of these five BMC-to-PCIe windows must be allocated for configuration
+ * transactions, the rest can be used for I/0 or memory transactions
+ * - All BMC-to-PCIe windows are mapped to address range
+ * 0xe800_0000 to 0xefff_ffff (128MB)
+ */
+
+#ifndef NPCM_PCIERC_H
+#define NPCM_PCIERC_H
+
+#include "hw/sysbus.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pcie_host.h"
+#include "qom/object.h"
+
+/* PCIe Root Complex Registers */
+#define LINKSTAT 0x92
+#define NPCM_PCIERC_RCCFGNUM 0x140 /* Configuration Number */
+#define NPCM_PCIERC_INTEN 0x180 /* Interrupt Enable */
+#define NPCM_PCIERC_INTST 0x184 /* Interrupt Status */
+#define NPCM_PCIERC_IMSI_ADDR 0x190
+#define NPCM_PCIERC_MSISTAT 0x194 /* MSI Status Register */
+#define NPCM_PCIERC_AXI_ERROR_REPORT 0x3E0
+
+#define TYPE_NPCM_PCIERC "npcm-pcie-root-complex"
+OBJECT_DECLARE_SIMPLE_TYPE(NPCMPCIERCState, NPCM_PCIERC)
+
+struct NPCMPCIERCState {
+ PCIExpressHost parent;
+
+ qemu_irq irq;
+
+ /* PCIe RC registers */
+ MemoryRegion mmio;
+ uint32_t rccfgnum;
+ uint32_t rcinten;
+ uint32_t rcintstat;
+ uint32_t rcimsiaddr;
+ uint32_t rcmsisstat;
+ uint32_t axierr;
+};
+
+#endif /* NPCM_PCIERC_H */
--
2.51.0.384.g4c02a37b29-goog© 2016 - 2025 Red Hat, Inc.