qemu

platform-bus.c (6724B)

---

 /*
  *  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 2.1 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 "qemu/osdep.h"
 #include "hw/platform-bus.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qemu/module.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",
                                          &error_abort);
     if (parent_mr != pbus_mr_obj) {
         /* MMIO region is not mapped on platform bus */
         return -1;
     }
 
     return object_property_get_uint(OBJECT(sbdev_mr), "addr", NULL);
 }
 
 static void 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;
             }
         }
     }
 }
 
 /*
  * 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);
 }
 
 static void 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;
     }
 
     irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
     if (irqn >= max_irqs) {
         error_report("Platform Bus: Can not fit IRQ line");
         exit(1);
     }
 
     set_bit(irqn, pbus->used_irqs);
     sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
 }
 
 static void 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;
     }
 
     /*
      * 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) {
         error_report("Platform Bus: Can not fit MMIO region of size %"PRIx64,
                      size);
         exit(1);
     }
 
     /* Map the device's region into our Platform Bus MMIO space */
     memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
 }
 
 /*
  * Look for unassigned IRQ lines as well as unassociated MMIO regions.
  * Connect them to the platform bus if available.
  */
 void platform_bus_link_device(PlatformBusDevice *pbus, SysBusDevice *sbdev)
 {
     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);
     }
 }
 
 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, OBJECT(dev), "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]);
     }
 
     /* some devices might be initialized before so update used IRQs map */
     plaform_bus_refresh_irqs(pbus);
 }
 
 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;
     device_class_set_props(dc, 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)