pci: Add generic PCIe host bridge

With simple exposure of MMFG, ioport window, mmio window and an IRQ line we
can successfully create a workable PCIe host bridge that can be mapped anywhere
and only needs to get described to the OS using whatever means it likes.

This patch implements such a "generic" host bridge. It handles 4 legacy IRQ
lines. MSIs need to be handled external to the host bridge.

This device is particularly useful for the "pci-host-ecam-generic" driver in
Linux.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Tested-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/hw/pci-host/gpex.h b/include/hw/pci-host/gpex.h
new file mode 100644
index 0000000..68c9348
--- /dev/null
+++ b/include/hw/pci-host/gpex.h
@@ -0,0 +1,56 @@
+/*
+ * QEMU Generic PCI Express Bridge Emulation
+ *
+ * Copyright (C) 2015 Alexander Graf <agraf@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 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/>
+ */
+
+#ifndef HW_GPEX_H
+#define HW_GPEX_H
+
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pcie_host.h"
+
+#define TYPE_GPEX_HOST "gpex-pcihost"
+#define GPEX_HOST(obj) \
+     OBJECT_CHECK(GPEXHost, (obj), TYPE_GPEX_HOST)
+
+#define TYPE_GPEX_ROOT_DEVICE "gpex-root"
+#define MCH_PCI_DEVICE(obj) \
+     OBJECT_CHECK(GPEXRootState, (obj), TYPE_GPEX_ROOT_DEVICE)
+
+#define GPEX_NUM_IRQS 4
+
+typedef struct GPEXRootState {
+    /*< private >*/
+    PCIDevice parent_obj;
+    /*< public >*/
+} GPEXRootState;
+
+typedef struct GPEXHost {
+    /*< private >*/
+    PCIExpressHost parent_obj;
+    /*< public >*/
+
+    GPEXRootState gpex_root;
+
+    MemoryRegion io_ioport;
+    MemoryRegion io_mmio;
+    qemu_irq irq[GPEX_NUM_IRQS];
+} GPEXHost;
+
+#endif /* HW_GPEX_H */