/*
* 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 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 "qemu/error-report.h"
#include "sysemu/sysemu.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", NULL);
assert(parent_mr);
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, NULL, "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;
dc->props = 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)
