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-rw-r--r--hw/core/Makefile.objs1
-rw-r--r--hw/core/platform-bus.c253
-rw-r--r--include/hw/platform-bus.h57
3 files changed, 311 insertions, 0 deletions
diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index 17845df3f0..9dce1bc53c 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -14,3 +14,4 @@ common-obj-$(CONFIG_SOFTMMU) += machine.o
common-obj-$(CONFIG_SOFTMMU) += null-machine.o
common-obj-$(CONFIG_SOFTMMU) += loader.o
common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
+common-obj-$(CONFIG_SOFTMMU) += platform-bus.o
diff --git a/hw/core/platform-bus.c b/hw/core/platform-bus.c
new file mode 100644
index 0000000000..0f052b3338
--- /dev/null
+++ b/hw/core/platform-bus.c
@@ -0,0 +1,253 @@
+/*
+ * Platform Bus device to support dynamic Sysbus devices
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: Alexander Graf, <agraf@suse.de>
+ *
+ * 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 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 "hw/platform-bus.h"
+#include "monitor/monitor.h"
+#include "exec/address-spaces.h"
+#include "sysemu/sysemu.h"
+
+
+/*
+ * Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
+ * the IRQ is not mapped on this Platform bus.
+ */
+int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+ int n)
+{
+ qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
+ int i;
+
+ for (i = 0; i < pbus->num_irqs; i++) {
+ if (pbus->irqs[i] == sbirq) {
+ return i;
+ }
+ }
+
+ /* IRQ not mapped on platform bus */
+ return -1;
+}
+
+/*
+ * Returns the PlatformBus MMIO region offset for Region n of a SysBusDevice or
+ * -1 if the region is not mapped on this Platform bus.
+ */
+hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+ int n)
+{
+ MemoryRegion *pbus_mr = &pbus->mmio;
+ MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
+ Object *pbus_mr_obj = OBJECT(pbus_mr);
+ Object *parent_mr;
+
+ if (!memory_region_is_mapped(sbdev_mr)) {
+ /* Region is not mapped? */
+ return -1;
+ }
+
+ parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container", NULL);
+
+ assert(parent_mr);
+ if (parent_mr != pbus_mr_obj) {
+ /* MMIO region is not mapped on platform bus */
+ return -1;
+ }
+
+ return object_property_get_int(OBJECT(sbdev_mr), "addr", NULL);
+}
+
+static int platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)
+{
+ PlatformBusDevice *pbus = opaque;
+ qemu_irq sbirq;
+ int n, i;
+
+ for (n = 0; ; n++) {
+ if (!sysbus_has_irq(sbdev, n)) {
+ break;
+ }
+
+ sbirq = sysbus_get_connected_irq(sbdev, n);
+ for (i = 0; i < pbus->num_irqs; i++) {
+ if (pbus->irqs[i] == sbirq) {
+ bitmap_set(pbus->used_irqs, i, 1);
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Loop through all sysbus devices and look for unassigned IRQ lines as well as
+ * unassociated MMIO regions. Connect them to the platform bus if available.
+ */
+static void plaform_bus_refresh_irqs(PlatformBusDevice *pbus)
+{
+ bitmap_zero(pbus->used_irqs, pbus->num_irqs);
+ foreach_dynamic_sysbus_device(platform_bus_count_irqs, pbus);
+ pbus->done_gathering = true;
+}
+
+static int platform_bus_map_irq(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+ int n)
+{
+ int max_irqs = pbus->num_irqs;
+ int irqn;
+
+ if (sysbus_is_irq_connected(sbdev, n)) {
+ /* IRQ is already mapped, nothing to do */
+ return 0;
+ }
+
+ irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
+ if (irqn >= max_irqs) {
+ hw_error("Platform Bus: Can not fit IRQ line");
+ return -1;
+ }
+
+ set_bit(irqn, pbus->used_irqs);
+ sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
+
+ return 0;
+}
+
+static int platform_bus_map_mmio(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+ int n)
+{
+ MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
+ uint64_t size = memory_region_size(sbdev_mr);
+ uint64_t alignment = (1ULL << (63 - clz64(size + size - 1)));
+ uint64_t off;
+ bool found_region = false;
+
+ if (memory_region_is_mapped(sbdev_mr)) {
+ /* Region is already mapped, nothing to do */
+ return 0;
+ }
+
+ /*
+ * Look for empty space in the MMIO space that is naturally aligned with
+ * the target device's memory region
+ */
+ for (off = 0; off < pbus->mmio_size; off += alignment) {
+ if (!memory_region_find(&pbus->mmio, off, size).mr) {
+ found_region = true;
+ break;
+ }
+ }
+
+ if (!found_region) {
+ hw_error("Platform Bus: Can not fit MMIO region of size %"PRIx64, size);
+ }
+
+ /* Map the device's region into our Platform Bus MMIO space */
+ memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
+
+ return 0;
+}
+
+/*
+ * For each sysbus device, look for unassigned IRQ lines as well as
+ * unassociated MMIO regions. Connect them to the platform bus if available.
+ */
+static int link_sysbus_device(SysBusDevice *sbdev, void *opaque)
+{
+ PlatformBusDevice *pbus = opaque;
+ int i;
+
+ for (i = 0; sysbus_has_irq(sbdev, i); i++) {
+ platform_bus_map_irq(pbus, sbdev, i);
+ }
+
+ for (i = 0; sysbus_has_mmio(sbdev, i); i++) {
+ platform_bus_map_mmio(pbus, sbdev, i);
+ }
+
+ return 0;
+}
+
+static void platform_bus_init_notify(Notifier *notifier, void *data)
+{
+ PlatformBusDevice *pb = container_of(notifier, PlatformBusDevice, notifier);
+
+ /*
+ * Generate a bitmap of used IRQ lines, as the user might have specified
+ * them on the command line.
+ */
+ plaform_bus_refresh_irqs(pb);
+
+ foreach_dynamic_sysbus_device(link_sysbus_device, pb);
+}
+
+static void platform_bus_realize(DeviceState *dev, Error **errp)
+{
+ PlatformBusDevice *pbus;
+ SysBusDevice *d;
+ int i;
+
+ d = SYS_BUS_DEVICE(dev);
+ pbus = PLATFORM_BUS_DEVICE(dev);
+
+ memory_region_init(&pbus->mmio, NULL, "platform bus", pbus->mmio_size);
+ sysbus_init_mmio(d, &pbus->mmio);
+
+ pbus->used_irqs = bitmap_new(pbus->num_irqs);
+ pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
+ for (i = 0; i < pbus->num_irqs; i++) {
+ sysbus_init_irq(d, &pbus->irqs[i]);
+ }
+
+ /*
+ * Register notifier that allows us to gather dangling devices once the
+ * machine is completely assembled
+ */
+ pbus->notifier.notify = platform_bus_init_notify;
+ qemu_add_machine_init_done_notifier(&pbus->notifier);
+}
+
+static Property platform_bus_properties[] = {
+ DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
+ DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
+ DEFINE_PROP_END_OF_LIST()
+};
+
+static void platform_bus_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = platform_bus_realize;
+ dc->props = platform_bus_properties;
+}
+
+static const TypeInfo platform_bus_info = {
+ .name = TYPE_PLATFORM_BUS_DEVICE,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(PlatformBusDevice),
+ .class_init = platform_bus_class_init,
+};
+
+static void platform_bus_register_types(void)
+{
+ type_register_static(&platform_bus_info);
+}
+
+type_init(platform_bus_register_types)
diff --git a/include/hw/platform-bus.h b/include/hw/platform-bus.h
new file mode 100644
index 0000000000..bd42b83809
--- /dev/null
+++ b/include/hw/platform-bus.h
@@ -0,0 +1,57 @@
+#ifndef HW_PLATFORM_BUS_H
+#define HW_PLATFORM_BUS_H 1
+
+/*
+ * Platform Bus device to support dynamic Sysbus devices
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: Alexander Graf, <agraf@suse.de>
+ *
+ * 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 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 "hw/sysbus.h"
+
+typedef struct PlatformBusDevice PlatformBusDevice;
+
+#define TYPE_PLATFORM_BUS_DEVICE "platform-bus-device"
+#define PLATFORM_BUS_DEVICE(obj) \
+ OBJECT_CHECK(PlatformBusDevice, (obj), TYPE_PLATFORM_BUS_DEVICE)
+#define PLATFORM_BUS_DEVICE_CLASS(klass) \
+ OBJECT_CLASS_CHECK(PlatformBusDeviceClass, (klass), TYPE_PLATFORM_BUS_DEVICE)
+#define PLATFORM_BUS_DEVICE_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(PlatformBusDeviceClass, (obj), TYPE_PLATFORM_BUS_DEVICE)
+
+struct PlatformBusDevice {
+ /*< private >*/
+ SysBusDevice parent_obj;
+ Notifier notifier;
+ bool done_gathering;
+
+ /*< public >*/
+ uint32_t mmio_size;
+ MemoryRegion mmio;
+
+ uint32_t num_irqs;
+ qemu_irq *irqs;
+ unsigned long *used_irqs;
+};
+
+int platform_bus_get_irqn(PlatformBusDevice *platform_bus, SysBusDevice *sbdev,
+ int n);
+hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+ int n);
+
+#endif /* !HW_PLATFORM_BUS_H */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-27 17:28:37 +0000