2 * Platform Bus device to support dynamic Sysbus devices
4 * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
22 #include "qemu/osdep.h"
23 #include "hw/platform-bus.h"
24 #include "qemu/error-report.h"
25 #include "sysemu/sysemu.h"
29 * Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
30 * the IRQ is not mapped on this Platform bus.
32 int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
35 qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
38 for (i = 0; i < pbus->num_irqs; i++) {
39 if (pbus->irqs[i] == sbirq) {
44 /* IRQ not mapped on platform bus */
49 * Returns the PlatformBus MMIO region offset for Region n of a SysBusDevice or
50 * -1 if the region is not mapped on this Platform bus.
52 hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
55 MemoryRegion *pbus_mr = &pbus->mmio;
56 MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
57 Object *pbus_mr_obj = OBJECT(pbus_mr);
60 if (!memory_region_is_mapped(sbdev_mr)) {
61 /* Region is not mapped? */
65 parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container", NULL);
68 if (parent_mr != pbus_mr_obj) {
69 /* MMIO region is not mapped on platform bus */
73 return object_property_get_uint(OBJECT(sbdev_mr), "addr", NULL);
76 static void platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)
78 PlatformBusDevice *pbus = opaque;
83 if (!sysbus_has_irq(sbdev, n)) {
87 sbirq = sysbus_get_connected_irq(sbdev, n);
88 for (i = 0; i < pbus->num_irqs; i++) {
89 if (pbus->irqs[i] == sbirq) {
90 bitmap_set(pbus->used_irqs, i, 1);
98 * Loop through all sysbus devices and look for unassigned IRQ lines as well as
99 * unassociated MMIO regions. Connect them to the platform bus if available.
101 static void plaform_bus_refresh_irqs(PlatformBusDevice *pbus)
103 bitmap_zero(pbus->used_irqs, pbus->num_irqs);
104 foreach_dynamic_sysbus_device(platform_bus_count_irqs, pbus);
107 static void platform_bus_map_irq(PlatformBusDevice *pbus, SysBusDevice *sbdev,
110 int max_irqs = pbus->num_irqs;
113 if (sysbus_is_irq_connected(sbdev, n)) {
114 /* IRQ is already mapped, nothing to do */
118 irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
119 if (irqn >= max_irqs) {
120 error_report("Platform Bus: Can not fit IRQ line");
124 set_bit(irqn, pbus->used_irqs);
125 sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
128 static void platform_bus_map_mmio(PlatformBusDevice *pbus, SysBusDevice *sbdev,
131 MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
132 uint64_t size = memory_region_size(sbdev_mr);
133 uint64_t alignment = (1ULL << (63 - clz64(size + size - 1)));
135 bool found_region = false;
137 if (memory_region_is_mapped(sbdev_mr)) {
138 /* Region is already mapped, nothing to do */
143 * Look for empty space in the MMIO space that is naturally aligned with
144 * the target device's memory region
146 for (off = 0; off < pbus->mmio_size; off += alignment) {
147 if (!memory_region_find(&pbus->mmio, off, size).mr) {
154 error_report("Platform Bus: Can not fit MMIO region of size %"PRIx64,
159 /* Map the device's region into our Platform Bus MMIO space */
160 memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
164 * Look for unassigned IRQ lines as well as unassociated MMIO regions.
165 * Connect them to the platform bus if available.
167 void platform_bus_link_device(PlatformBusDevice *pbus, SysBusDevice *sbdev)
171 for (i = 0; sysbus_has_irq(sbdev, i); i++) {
172 platform_bus_map_irq(pbus, sbdev, i);
175 for (i = 0; sysbus_has_mmio(sbdev, i); i++) {
176 platform_bus_map_mmio(pbus, sbdev, i);
180 static void platform_bus_realize(DeviceState *dev, Error **errp)
182 PlatformBusDevice *pbus;
186 d = SYS_BUS_DEVICE(dev);
187 pbus = PLATFORM_BUS_DEVICE(dev);
189 memory_region_init(&pbus->mmio, NULL, "platform bus", pbus->mmio_size);
190 sysbus_init_mmio(d, &pbus->mmio);
192 pbus->used_irqs = bitmap_new(pbus->num_irqs);
193 pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
194 for (i = 0; i < pbus->num_irqs; i++) {
195 sysbus_init_irq(d, &pbus->irqs[i]);
198 /* some devices might be initialized before so update used IRQs map */
199 plaform_bus_refresh_irqs(pbus);
202 static Property platform_bus_properties[] = {
203 DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
204 DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
205 DEFINE_PROP_END_OF_LIST()
208 static void platform_bus_class_init(ObjectClass *klass, void *data)
210 DeviceClass *dc = DEVICE_CLASS(klass);
212 dc->realize = platform_bus_realize;
213 dc->props = platform_bus_properties;
216 static const TypeInfo platform_bus_info = {
217 .name = TYPE_PLATFORM_BUS_DEVICE,
218 .parent = TYPE_SYS_BUS_DEVICE,
219 .instance_size = sizeof(PlatformBusDevice),
220 .class_init = platform_bus_class_init,
223 static void platform_bus_register_types(void)
225 type_register_static(&platform_bus_info);
228 type_init(platform_bus_register_types)