hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[qemu.git] / hw / core / platform-bus.c
1 /*
2 * Platform Bus device to support dynamic Sysbus devices
3 *
4 * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
5 *
6 * Author: Alexander Graf, <agraf@suse.de>
7 *
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.
12 *
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.
17 *
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/>.
20 */
21
22 #include "qemu/osdep.h"
23 #include "hw/platform-bus.h"
24 #include "hw/qdev-properties.h"
25 #include "qapi/error.h"
26 #include "qemu/error-report.h"
27 #include "qemu/module.h"
28
29
30 /*
31 * Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
32 * the IRQ is not mapped on this Platform bus.
33 */
34 int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
35 int n)
36 {
37 qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
38 int i;
39
40 for (i = 0; i < pbus->num_irqs; i++) {
41 if (pbus->irqs[i] == sbirq) {
42 return i;
43 }
44 }
45
46 /* IRQ not mapped on platform bus */
47 return -1;
48 }
49
50 /*
51 * Returns the PlatformBus MMIO region offset for Region n of a SysBusDevice or
52 * -1 if the region is not mapped on this Platform bus.
53 */
54 hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
55 int n)
56 {
57 MemoryRegion *pbus_mr = &pbus->mmio;
58 MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
59 Object *pbus_mr_obj = OBJECT(pbus_mr);
60 Object *parent_mr;
61
62 if (!memory_region_is_mapped(sbdev_mr)) {
63 /* Region is not mapped? */
64 return -1;
65 }
66
67 parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container",
68 &error_abort);
69 if (parent_mr != pbus_mr_obj) {
70 /* MMIO region is not mapped on platform bus */
71 return -1;
72 }
73
74 return object_property_get_uint(OBJECT(sbdev_mr), "addr", NULL);
75 }
76
77 static void platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)
78 {
79 PlatformBusDevice *pbus = opaque;
80 qemu_irq sbirq;
81 int n, i;
82
83 for (n = 0; ; n++) {
84 if (!sysbus_has_irq(sbdev, n)) {
85 break;
86 }
87
88 sbirq = sysbus_get_connected_irq(sbdev, n);
89 for (i = 0; i < pbus->num_irqs; i++) {
90 if (pbus->irqs[i] == sbirq) {
91 bitmap_set(pbus->used_irqs, i, 1);
92 break;
93 }
94 }
95 }
96 }
97
98 /*
99 * Loop through all sysbus devices and look for unassigned IRQ lines as well as
100 * unassociated MMIO regions. Connect them to the platform bus if available.
101 */
102 static void plaform_bus_refresh_irqs(PlatformBusDevice *pbus)
103 {
104 bitmap_zero(pbus->used_irqs, pbus->num_irqs);
105 foreach_dynamic_sysbus_device(platform_bus_count_irqs, pbus);
106 }
107
108 static void platform_bus_map_irq(PlatformBusDevice *pbus, SysBusDevice *sbdev,
109 int n)
110 {
111 int max_irqs = pbus->num_irqs;
112 int irqn;
113
114 if (sysbus_is_irq_connected(sbdev, n)) {
115 /* IRQ is already mapped, nothing to do */
116 return;
117 }
118
119 irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
120 if (irqn >= max_irqs) {
121 error_report("Platform Bus: Can not fit IRQ line");
122 exit(1);
123 }
124
125 set_bit(irqn, pbus->used_irqs);
126 sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
127 }
128
129 static void platform_bus_map_mmio(PlatformBusDevice *pbus, SysBusDevice *sbdev,
130 int n)
131 {
132 MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
133 uint64_t size = memory_region_size(sbdev_mr);
134 uint64_t alignment = (1ULL << (63 - clz64(size + size - 1)));
135 uint64_t off;
136 bool found_region = false;
137
138 if (memory_region_is_mapped(sbdev_mr)) {
139 /* Region is already mapped, nothing to do */
140 return;
141 }
142
143 /*
144 * Look for empty space in the MMIO space that is naturally aligned with
145 * the target device's memory region
146 */
147 for (off = 0; off < pbus->mmio_size; off += alignment) {
148 if (!memory_region_find(&pbus->mmio, off, size).mr) {
149 found_region = true;
150 break;
151 }
152 }
153
154 if (!found_region) {
155 error_report("Platform Bus: Can not fit MMIO region of size %"PRIx64,
156 size);
157 exit(1);
158 }
159
160 /* Map the device's region into our Platform Bus MMIO space */
161 memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
162 }
163
164 /*
165 * Look for unassigned IRQ lines as well as unassociated MMIO regions.
166 * Connect them to the platform bus if available.
167 */
168 void platform_bus_link_device(PlatformBusDevice *pbus, SysBusDevice *sbdev)
169 {
170 int i;
171
172 for (i = 0; sysbus_has_irq(sbdev, i); i++) {
173 platform_bus_map_irq(pbus, sbdev, i);
174 }
175
176 for (i = 0; sysbus_has_mmio(sbdev, i); i++) {
177 platform_bus_map_mmio(pbus, sbdev, i);
178 }
179 }
180
181 static void platform_bus_realize(DeviceState *dev, Error **errp)
182 {
183 PlatformBusDevice *pbus;
184 SysBusDevice *d;
185 int i;
186
187 d = SYS_BUS_DEVICE(dev);
188 pbus = PLATFORM_BUS_DEVICE(dev);
189
190 memory_region_init(&pbus->mmio, OBJECT(dev), "platform bus",
191 pbus->mmio_size);
192 sysbus_init_mmio(d, &pbus->mmio);
193
194 pbus->used_irqs = bitmap_new(pbus->num_irqs);
195 pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
196 for (i = 0; i < pbus->num_irqs; i++) {
197 sysbus_init_irq(d, &pbus->irqs[i]);
198 }
199
200 /* some devices might be initialized before so update used IRQs map */
201 plaform_bus_refresh_irqs(pbus);
202 }
203
204 static Property platform_bus_properties[] = {
205 DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
206 DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
207 DEFINE_PROP_END_OF_LIST()
208 };
209
210 static void platform_bus_class_init(ObjectClass *klass, void *data)
211 {
212 DeviceClass *dc = DEVICE_CLASS(klass);
213
214 dc->realize = platform_bus_realize;
215 device_class_set_props(dc, platform_bus_properties);
216 }
217
218 static const TypeInfo platform_bus_info = {
219 .name = TYPE_PLATFORM_BUS_DEVICE,
220 .parent = TYPE_SYS_BUS_DEVICE,
221 .instance_size = sizeof(PlatformBusDevice),
222 .class_init = platform_bus_class_init,
223 };
224
225 static void platform_bus_register_types(void)
226 {
227 type_register_static(&platform_bus_info);
228 }
229
230 type_init(platform_bus_register_types)