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 "qemu/error-report.h"
  25 #include "qemu/module.h"
  26 #include "sysemu/sysemu.h"
  27
  28
  29 /*
  30  * Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
  31  * the IRQ is not mapped on this Platform bus.
  32  */
  33 int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
  34                           int n)
  35 {
  36     qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
  37     int i;
  38
  39     for (i = 0; i < pbus->num_irqs; i++) {
  40         if (pbus->irqs[i] == sbirq) {
  41             return i;
  42         }
  43     }
  44
  45     /* IRQ not mapped on platform bus */
  46     return -1;
  47 }
  48
  49 /*
  50  * Returns the PlatformBus MMIO region offset for Region n of a SysBusDevice or
  51  * -1 if the region is not mapped on this Platform bus.
  52  */
  53 hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
  54                                   int n)
  55 {
  56     MemoryRegion *pbus_mr = &pbus->mmio;
  57     MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
  58     Object *pbus_mr_obj = OBJECT(pbus_mr);
  59     Object *parent_mr;
  60
  61     if (!memory_region_is_mapped(sbdev_mr)) {
  62         /* Region is not mapped? */
  63         return -1;
  64     }
  65
  66     parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container", NULL);
  67
  68     assert(parent_mr);
  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, NULL, "platform bus", pbus->mmio_size);
 191     sysbus_init_mmio(d, &pbus->mmio);
 192
 193     pbus->used_irqs = bitmap_new(pbus->num_irqs);
 194     pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
 195     for (i = 0; i < pbus->num_irqs; i++) {
 196         sysbus_init_irq(d, &pbus->irqs[i]);
 197     }
 198
 199     /* some devices might be initialized before so update used IRQs map */
 200     plaform_bus_refresh_irqs(pbus);
 201 }
 202
 203 static Property platform_bus_properties[] = {
 204     DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
 205     DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
 206     DEFINE_PROP_END_OF_LIST()
 207 };
 208
 209 static void platform_bus_class_init(ObjectClass *klass, void *data)
 210 {
 211     DeviceClass *dc = DEVICE_CLASS(klass);
 212
 213     dc->realize = platform_bus_realize;
 214     dc->props = platform_bus_properties;
 215 }
 216
 217 static const TypeInfo platform_bus_info = {
 218     .name          = TYPE_PLATFORM_BUS_DEVICE,
 219     .parent        = TYPE_SYS_BUS_DEVICE,
 220     .instance_size = sizeof(PlatformBusDevice),
 221     .class_init    = platform_bus_class_init,
 222 };
 223
 224 static void platform_bus_register_types(void)
 225 {
 226     type_register_static(&platform_bus_info);
 227 }
 228
 229 type_init(platform_bus_register_types)