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 "hw/platform-bus.h"
  23 #include "monitor/monitor.h"
  24 #include "exec/address-spaces.h"
  25 #include "sysemu/sysemu.h"
  26
  27
  28 /*
  29  * Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
  30  * the IRQ is not mapped on this Platform bus.
  31  */
  32 int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
  33                           int n)
  34 {
  35     qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
  36     int i;
  37
  38     for (i = 0; i < pbus->num_irqs; i++) {
  39         if (pbus->irqs[i] == sbirq) {
  40             return i;
  41         }
  42     }
  43
  44     /* IRQ not mapped on platform bus */
  45     return -1;
  46 }
  47
  48 /*
  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.
  51  */
  52 hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
  53                                   int n)
  54 {
  55     MemoryRegion *pbus_mr = &pbus->mmio;
  56     MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
  57     Object *pbus_mr_obj = OBJECT(pbus_mr);
  58     Object *parent_mr;
  59
  60     if (!memory_region_is_mapped(sbdev_mr)) {
  61         /* Region is not mapped? */
  62         return -1;
  63     }
  64
  65     parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container", NULL);
  66
  67     assert(parent_mr);
  68     if (parent_mr != pbus_mr_obj) {
  69         /* MMIO region is not mapped on platform bus */
  70         return -1;
  71     }
  72
  73     return object_property_get_int(OBJECT(sbdev_mr), "addr", NULL);
  74 }
  75
  76 static int platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)
  77 {
  78     PlatformBusDevice *pbus = opaque;
  79     qemu_irq sbirq;
  80     int n, i;
  81
  82     for (n = 0; ; n++) {
  83         if (!sysbus_has_irq(sbdev, n)) {
  84             break;
  85         }
  86
  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);
  91                 break;
  92             }
  93         }
  94     }
  95
  96     return 0;
  97 }
  98
  99 /*
 100  * Loop through all sysbus devices and look for unassigned IRQ lines as well as
 101  * unassociated MMIO regions. Connect them to the platform bus if available.
 102  */
 103 static void plaform_bus_refresh_irqs(PlatformBusDevice *pbus)
 104 {
 105     bitmap_zero(pbus->used_irqs, pbus->num_irqs);
 106     foreach_dynamic_sysbus_device(platform_bus_count_irqs, pbus);
 107     pbus->done_gathering = true;
 108 }
 109
 110 static int platform_bus_map_irq(PlatformBusDevice *pbus, SysBusDevice *sbdev,
 111                                 int n)
 112 {
 113     int max_irqs = pbus->num_irqs;
 114     int irqn;
 115
 116     if (sysbus_is_irq_connected(sbdev, n)) {
 117         /* IRQ is already mapped, nothing to do */
 118         return 0;
 119     }
 120
 121     irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
 122     if (irqn >= max_irqs) {
 123         hw_error("Platform Bus: Can not fit IRQ line");
 124         return -1;
 125     }
 126
 127     set_bit(irqn, pbus->used_irqs);
 128     sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
 129
 130     return 0;
 131 }
 132
 133 static int platform_bus_map_mmio(PlatformBusDevice *pbus, SysBusDevice *sbdev,
 134                                  int n)
 135 {
 136     MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
 137     uint64_t size = memory_region_size(sbdev_mr);
 138     uint64_t alignment = (1ULL << (63 - clz64(size + size - 1)));
 139     uint64_t off;
 140     bool found_region = false;
 141
 142     if (memory_region_is_mapped(sbdev_mr)) {
 143         /* Region is already mapped, nothing to do */
 144         return 0;
 145     }
 146
 147     /*
 148      * Look for empty space in the MMIO space that is naturally aligned with
 149      * the target device's memory region
 150      */
 151     for (off = 0; off < pbus->mmio_size; off += alignment) {
 152         if (!memory_region_find(&pbus->mmio, off, size).mr) {
 153             found_region = true;
 154             break;
 155         }
 156     }
 157
 158     if (!found_region) {
 159         hw_error("Platform Bus: Can not fit MMIO region of size %"PRIx64, size);
 160     }
 161
 162     /* Map the device's region into our Platform Bus MMIO space */
 163     memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
 164
 165     return 0;
 166 }
 167
 168 /*
 169  * For each sysbus device, look for unassigned IRQ lines as well as
 170  * unassociated MMIO regions. Connect them to the platform bus if available.
 171  */
 172 static int link_sysbus_device(SysBusDevice *sbdev, void *opaque)
 173 {
 174     PlatformBusDevice *pbus = opaque;
 175     int i;
 176
 177     for (i = 0; sysbus_has_irq(sbdev, i); i++) {
 178         platform_bus_map_irq(pbus, sbdev, i);
 179     }
 180
 181     for (i = 0; sysbus_has_mmio(sbdev, i); i++) {
 182         platform_bus_map_mmio(pbus, sbdev, i);
 183     }
 184
 185     return 0;
 186 }
 187
 188 static void platform_bus_init_notify(Notifier *notifier, void *data)
 189 {
 190     PlatformBusDevice *pb = container_of(notifier, PlatformBusDevice, notifier);
 191
 192     /*
 193      * Generate a bitmap of used IRQ lines, as the user might have specified
 194      * them on the command line.
 195      */
 196     plaform_bus_refresh_irqs(pb);
 197
 198     foreach_dynamic_sysbus_device(link_sysbus_device, pb);
 199 }
 200
 201 static void platform_bus_realize(DeviceState *dev, Error **errp)
 202 {
 203     PlatformBusDevice *pbus;
 204     SysBusDevice *d;
 205     int i;
 206
 207     d = SYS_BUS_DEVICE(dev);
 208     pbus = PLATFORM_BUS_DEVICE(dev);
 209
 210     memory_region_init(&pbus->mmio, NULL, "platform bus", pbus->mmio_size);
 211     sysbus_init_mmio(d, &pbus->mmio);
 212
 213     pbus->used_irqs = bitmap_new(pbus->num_irqs);
 214     pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
 215     for (i = 0; i < pbus->num_irqs; i++) {
 216         sysbus_init_irq(d, &pbus->irqs[i]);
 217     }
 218
 219     /*
 220      * Register notifier that allows us to gather dangling devices once the
 221      * machine is completely assembled
 222      */
 223     pbus->notifier.notify = platform_bus_init_notify;
 224     qemu_add_machine_init_done_notifier(&pbus->notifier);
 225 }
 226
 227 static Property platform_bus_properties[] = {
 228     DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
 229     DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
 230     DEFINE_PROP_END_OF_LIST()
 231 };
 232
 233 static void platform_bus_class_init(ObjectClass *klass, void *data)
 234 {
 235     DeviceClass *dc = DEVICE_CLASS(klass);
 236
 237     dc->realize = platform_bus_realize;
 238     dc->props = platform_bus_properties;
 239 }
 240
 241 static const TypeInfo platform_bus_info = {
 242     .name          = TYPE_PLATFORM_BUS_DEVICE,
 243     .parent        = TYPE_SYS_BUS_DEVICE,
 244     .instance_size = sizeof(PlatformBusDevice),
 245     .class_init    = platform_bus_class_init,
 246 };
 247
 248 static void platform_bus_register_types(void)
 249 {
 250     type_register_static(&platform_bus_info);
 251 }
 252
 253 type_init(platform_bus_register_types)