This new module implements routines which help in dynamic instantiation
of sysbus devices. Machine files can use those generic routines.
---
Dynamic sysbus device allocation fully written by Alex Graf.
[Eric Auger]
Those functions were initially in ppc e500 machine file. Now moved to a
separate module.
PPCE500Params is replaced by a generic struct named PlatformParams
Signed-off-by: Alexander Graf <address@hidden>
Signed-off-by: Eric Auger <address@hidden>
---
hw/misc/Makefile.objs | 1 +
hw/misc/platform_devices.c | 217 +++++++++++++++++++++++++++++++++++++
include/hw/misc/platform_devices.h | 61 +++++++++++
3 files changed, 279 insertions(+)
create mode 100644 hw/misc/platform_devices.c
create mode 100644 include/hw/misc/platform_devices.h
diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index e47fea8..d081606 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -40,3 +40,4 @@ obj-$(CONFIG_SLAVIO) += slavio_misc.o
obj-$(CONFIG_ZYNQ) += zynq_slcr.o
obj-$(CONFIG_PVPANIC) += pvpanic.o
+obj-y += platform_devices.o
diff --git a/hw/misc/platform_devices.c b/hw/misc/platform_devices.c
new file mode 100644
index 0000000..96ab272
--- /dev/null
+++ b/hw/misc/platform_devices.c
@@ -0,0 +1,217 @@
+#include "hw/misc/platform_devices.h"
+#include "hw/sysbus.h"
+#include "qemu/error-report.h"
+
+#define PAGE_SHIFT 12
+
+int sysbus_device_create_devtree(Object *obj, void *opaque)
+{
+ PlatformDevtreeData *data = opaque;
+ Object *dev;
+ SysBusDevice *sbdev;
+ bool matched = false;
+
+ dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
+ sbdev = (SysBusDevice *)dev;
+
+ if (!sbdev) {
+ /* Container, traverse it for children */
+ return object_child_foreach(obj, sysbus_device_create_devtree, data);
+ }
+
+ if (!matched) {
+ error_report("Device %s is not supported by this machine yet.",
+ qdev_fw_name(DEVICE(dev)));
+ exit(1);
+ }
+
+ return 0;
+}
+
+void platform_bus_create_devtree(PlatformParams *params, void *fdt,
+ const char *mpic)
+{
+ gchar *node = g_strdup_printf("/address@hidden"PRIx64,
+ params->platform_bus_base);
+ const char platcomp[] = "qemu,platform\0simple-bus";
+ PlatformDevtreeData data;
+ Object *container;
+ uint64_t addr = params->platform_bus_base;
+ uint64_t size = params->platform_bus_size;
+ int irq_start = params->platform_bus_first_irq;
+
+ /* Create a /platform node that we can put all devices into */
+
+ qemu_fdt_add_subnode(fdt, node);
+ qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));
+
+ /* Our platform bus region is less than 32bit big, so 1 cell is enough for
+ address and size */
+ qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
+ qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
+ qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
+
+ qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", mpic);
+
+ /* Loop through all devices and create nodes for known ones */
+ data.fdt = fdt;
+ data.mpic = mpic;
+ data.irq_start = irq_start;
+ data.node = node;
+
+ container = container_get(qdev_get_machine(), "/peripheral");
+ sysbus_device_create_devtree(container, &data);
+ container = container_get(qdev_get_machine(), "/peripheral-anon");
+ sysbus_device_create_devtree(container, &data);
+
+ g_free(node);
+}
+
+int platform_bus_map_irq(PlatformParams *params, SysBusDevice *sbdev,
+ int n, unsigned long *used_irqs,
+ qemu_irq *platform_irqs)
+{
+ int max_irqs = params->platform_bus_num_irqs;
+ char *prop = g_strdup_printf("irq[%d]", n);
+ int irqn = object_property_get_int(OBJECT(sbdev), prop, NULL);
+
+ if (irqn == SYSBUS_DYNAMIC) {
+ /* Find the first available IRQ */
+ irqn = find_first_zero_bit(used_irqs, max_irqs);
+ }
+
+ if ((irqn >= max_irqs) || test_and_set_bit(irqn, used_irqs)) {
+ hw_error("IRQ %d is already allocated or no free IRQ left", irqn);
+ }
+
+ sysbus_connect_irq(sbdev, n, platform_irqs[irqn]);
+ object_property_set_int(OBJECT(sbdev), irqn, prop, NULL);
+
+ g_free(prop);
+ return 0;
+}
+
+int platform_bus_map_mmio(PlatformParams *params, SysBusDevice *sbdev,
+ int n, unsigned long *used_mem,
+ MemoryRegion *pmem)
+{
+ MemoryRegion *device_mem = sbdev->mmio[n].memory;
+ uint64_t size = memory_region_size(device_mem);
+ uint64_t page_size = (1 << PAGE_SHIFT);
+ uint64_t page_mask = page_size - 1;
+ uint64_t size_pages = (size + page_mask) >> PAGE_SHIFT;
+ uint64_t max_size = params->platform_bus_size;
+ uint64_t max_pages = max_size >> PAGE_SHIFT;
+ char *prop = g_strdup_printf("mmio[%d]", n);
+ hwaddr addr = object_property_get_int(OBJECT(sbdev), prop, NULL);
+ int page;
+ int i;
+
+ page = addr >> PAGE_SHIFT;
+ if (addr == SYSBUS_DYNAMIC) {
+ uint64_t size_pages_align;
+
+ /* Align the region to at least its own size granularity */
+ if (is_power_of_2(size_pages)) {
+ size_pages_align = size_pages;
+ } else {
+ size_pages_align = pow2floor(size_pages) << 1;
+ }
+
+ /* Find the first available region that fits */
+ page = bitmap_find_next_zero_area(used_mem, max_pages, 0, size_pages,
+ size_pages_align);
+
+ addr = (uint64_t)page << PAGE_SHIFT;
+ }
+
+ if (page >= max_pages || test_bit(page, used_mem) ||
+ (find_next_bit(used_mem, max_pages, page) < size_pages)) {
+ hw_error("Memory [%"PRIx64":%"PRIx64" is already allocated or "
+ "no slot left", addr, size);
+ }
+
+ for (i = page; i < (page + size_pages); i++) {
+ set_bit(i, used_mem);
+ }
+
+ memory_region_add_subregion(pmem, addr, device_mem);
+ sbdev->mmio[n].addr = addr;
+ object_property_set_int(OBJECT(sbdev), addr, prop, NULL);
+
+ g_free(prop);
+ return 0;
+}
+
+int sysbus_device_check(Object *obj, void *opaque)
+{
+ PlatformBusInitData *init = opaque;
+ Object *dev;
+ SysBusDevice *sbdev;
+ int i;
+
+ dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
+ sbdev = (SysBusDevice *)dev;
+
+ if (!sbdev) {
+ /* Container, traverse it for children */
+ return object_child_foreach(obj, sysbus_device_check, opaque);
+ }
+
+ /* Connect sysbus device to virtual platform bus */
+ for (i = 0; i < sbdev->num_irq; i++) {
+ if (!sbdev->irqp[i]) {
+ /* This IRQ is an incoming IRQ, we can't wire those here */
+ continue;
+ }
+ platform_bus_map_irq(init->params, sbdev, i,
+ init->used_irqs, init->irqs);
+ }
+
+ for (i = 0; i < sbdev->num_mmio; i++) {
+ platform_bus_map_mmio(init->params, sbdev, i,
+ init->used_mem, init->mem);
+ }
+
+ return 0;
+}
+
+void platform_bus_init(PlatformParams *params,
+ MemoryRegion *address_space_mem,
+ qemu_irq *mpic)
+{
+ uint64_t max_size = params->platform_bus_size;
+ uint64_t max_pages = max_size >> PAGE_SHIFT;
+ DECLARE_BITMAP(used_irqs, params->platform_bus_num_irqs);
+ DECLARE_BITMAP(used_mem, max_pages);
+ MemoryRegion *platform_region = g_new(MemoryRegion, 1);
+ Object *container;
+ PlatformBusInitData init = {
+ .used_irqs = used_irqs,
+ .used_mem = used_mem,
+ .mem = platform_region,
+ .irqs = &mpic[params->platform_bus_first_irq],
+ .params = params,
+ };
+
+ memory_region_init(platform_region, NULL, "platform devices",
+ params->platform_bus_size);
+
+ bitmap_clear(used_irqs, 0, params->platform_bus_num_irqs);
+ bitmap_clear(used_mem, 0, max_pages);
+
+ /* Loop through all sysbus devices that were spawened outside the machine
*/
+ container = container_get(qdev_get_machine(), "/peripheral");
+ sysbus_device_check(container, &init);
+ container = container_get(qdev_get_machine(), "/peripheral-anon");
+ sysbus_device_check(container, &init);
+
+ memory_region_add_subregion(address_space_mem, params->platform_bus_base,
+ platform_region);
+}