253 lines
7 KiB
C
253 lines
7 KiB
C
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/*
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* Platform Bus device to support dynamic Sysbus devices
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*
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* Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
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*
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* Author: Alexander Graf, <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/platform-bus.h"
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#include "exec/address-spaces.h"
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#include "sysemu/sysemu.h"
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/*
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* Returns the PlatformBus IRQ number for a SysBusDevice irq number or -1 if
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* the IRQ is not mapped on this Platform bus.
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*/
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int platform_bus_get_irqn(PlatformBusDevice *pbus, SysBusDevice *sbdev,
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int n)
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{
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qemu_irq sbirq = sysbus_get_connected_irq(sbdev, n);
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int i;
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for (i = 0; i < pbus->num_irqs; i++) {
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if (pbus->irqs[i] == sbirq) {
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return i;
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}
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}
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/* IRQ not mapped on platform bus */
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return -1;
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}
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/*
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* Returns the PlatformBus MMIO region offset for Region n of a SysBusDevice or
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* -1 if the region is not mapped on this Platform bus.
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*/
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hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
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int n)
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{
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MemoryRegion *pbus_mr = &pbus->mmio;
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MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
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Object *pbus_mr_obj = OBJECT(pbus_mr);
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Object *parent_mr;
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if (!memory_region_is_mapped(sbdev_mr)) {
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/* Region is not mapped? */
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return -1;
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}
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parent_mr = object_property_get_link(OBJECT(sbdev_mr), "container", NULL);
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assert(parent_mr);
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if (parent_mr != pbus_mr_obj) {
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/* MMIO region is not mapped on platform bus */
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return -1;
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}
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return object_property_get_int(OBJECT(sbdev_mr), "addr", NULL);
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}
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static int platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)
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{
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PlatformBusDevice *pbus = opaque;
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qemu_irq sbirq;
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int n, i;
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for (n = 0; ; n++) {
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if (!sysbus_has_irq(sbdev, n)) {
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break;
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}
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sbirq = sysbus_get_connected_irq(sbdev, n);
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for (i = 0; i < pbus->num_irqs; i++) {
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if (pbus->irqs[i] == sbirq) {
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bitmap_set(pbus->used_irqs, i, 1);
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break;
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}
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}
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}
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return 0;
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}
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/*
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* Loop through all sysbus devices and look for unassigned IRQ lines as well as
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* unassociated MMIO regions. Connect them to the platform bus if available.
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*/
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static void plaform_bus_refresh_irqs(PlatformBusDevice *pbus)
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{
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bitmap_zero(pbus->used_irqs, pbus->num_irqs);
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foreach_dynamic_sysbus_device(platform_bus_count_irqs, pbus);
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pbus->done_gathering = true;
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}
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static int platform_bus_map_irq(PlatformBusDevice *pbus, SysBusDevice *sbdev,
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int n)
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{
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int max_irqs = pbus->num_irqs;
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int irqn;
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if (sysbus_is_irq_connected(sbdev, n)) {
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/* IRQ is already mapped, nothing to do */
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return 0;
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}
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irqn = find_first_zero_bit(pbus->used_irqs, max_irqs);
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if (irqn >= max_irqs) {
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hw_error("Platform Bus: Can not fit IRQ line");
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return -1;
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}
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set_bit(irqn, pbus->used_irqs);
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sysbus_connect_irq(sbdev, n, pbus->irqs[irqn]);
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return 0;
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}
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static int platform_bus_map_mmio(PlatformBusDevice *pbus, SysBusDevice *sbdev,
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int n)
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{
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MemoryRegion *sbdev_mr = sysbus_mmio_get_region(sbdev, n);
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uint64_t size = memory_region_size(sbdev_mr);
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uint64_t alignment = (1ULL << (63 - clz64(size + size - 1)));
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uint64_t off;
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bool found_region = false;
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if (memory_region_is_mapped(sbdev_mr)) {
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/* Region is already mapped, nothing to do */
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return 0;
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}
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/*
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* Look for empty space in the MMIO space that is naturally aligned with
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* the target device's memory region
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*/
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for (off = 0; off < pbus->mmio_size; off += alignment) {
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if (!memory_region_find(&pbus->mmio, off, size).mr) {
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found_region = true;
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break;
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}
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}
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if (!found_region) {
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hw_error("Platform Bus: Can not fit MMIO region of size %"PRIx64, size);
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}
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/* Map the device's region into our Platform Bus MMIO space */
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memory_region_add_subregion(&pbus->mmio, off, sbdev_mr);
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return 0;
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}
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/*
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* For each sysbus device, look for unassigned IRQ lines as well as
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* unassociated MMIO regions. Connect them to the platform bus if available.
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*/
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static int link_sysbus_device(SysBusDevice *sbdev, void *opaque)
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{
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PlatformBusDevice *pbus = opaque;
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int i;
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for (i = 0; sysbus_has_irq(sbdev, i); i++) {
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platform_bus_map_irq(pbus, sbdev, i);
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}
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for (i = 0; sysbus_has_mmio(sbdev, i); i++) {
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platform_bus_map_mmio(pbus, sbdev, i);
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}
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return 0;
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}
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static void platform_bus_init_notify(Notifier *notifier, void *data)
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{
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PlatformBusDevice *pb = container_of(notifier, PlatformBusDevice, notifier);
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/*
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* Generate a bitmap of used IRQ lines, as the user might have specified
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* them on the command line.
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*/
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plaform_bus_refresh_irqs(pb);
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foreach_dynamic_sysbus_device(link_sysbus_device, pb);
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}
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static void platform_bus_realize(DeviceState *dev, Error **errp)
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{
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PlatformBusDevice *pbus;
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SysBusDevice *d;
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int i;
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d = SYS_BUS_DEVICE(dev);
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pbus = PLATFORM_BUS_DEVICE(dev);
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memory_region_init(&pbus->mmio, NULL, "platform bus", pbus->mmio_size);
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sysbus_init_mmio(d, &pbus->mmio);
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pbus->used_irqs = bitmap_new(pbus->num_irqs);
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pbus->irqs = g_new0(qemu_irq, pbus->num_irqs);
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for (i = 0; i < pbus->num_irqs; i++) {
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sysbus_init_irq(d, &pbus->irqs[i]);
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}
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/*
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* Register notifier that allows us to gather dangling devices once the
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* machine is completely assembled
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*/
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pbus->notifier.notify = platform_bus_init_notify;
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qemu_add_machine_init_done_notifier(&pbus->notifier);
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}
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static Property platform_bus_properties[] = {
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DEFINE_PROP_UINT32("num_irqs", PlatformBusDevice, num_irqs, 0),
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DEFINE_PROP_UINT32("mmio_size", PlatformBusDevice, mmio_size, 0),
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DEFINE_PROP_END_OF_LIST()
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};
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static void platform_bus_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = platform_bus_realize;
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dc->props = platform_bus_properties;
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}
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static const TypeInfo platform_bus_info = {
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.name = TYPE_PLATFORM_BUS_DEVICE,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(PlatformBusDevice),
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.class_init = platform_bus_class_init,
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};
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static void platform_bus_register_types(void)
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{
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type_register_static(&platform_bus_info);
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}
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type_init(platform_bus_register_types)
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