ppc/ppc405: Introduce a PPC405 SoC

It is an initial model to start QOMification of the PPC405 board.
QOM'ified devices will be reintroduced one by one. Start with the
memory regions, which name prefix is changed to "ppc405".

Also, initialize only one RAM bank. The second bank is a dummy one
(zero size) which is here to match the hard coded number of banks in
ppc405ep_init().

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <20220809153904.485018-6-clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

hw/ppc/ppc405.h

@@ -25,6 +25,7 @@
 #ifndef PPC405_H
 #define PPC405_H
 
+#include "qom/object.h"
 #include "hw/ppc/ppc4xx.h"
 
 #define PPC405EP_SDRAM_BASE 0x00000000
@@ -62,6 +63,21 @@ struct ppc4xx_bd_info_t {
     uint32_t bi_iic_fast[2];
 };
 
+#define TYPE_PPC405_SOC "ppc405-soc"
+OBJECT_DECLARE_SIMPLE_TYPE(Ppc405SoCState, PPC405_SOC);
+
+struct Ppc405SoCState {
+    /* Private */
+    DeviceState parent_obj;
+
+    /* Public */
+    MemoryRegion ram_banks[2];
+    hwaddr ram_bases[2], ram_sizes[2];
+
+    MemoryRegion *dram_mr;
+    hwaddr ram_size;
+};
+
 /* PowerPC 405 core */
 ram_addr_t ppc405_set_bootinfo(CPUPPCState *env, ram_addr_t ram_size);
 

hw/ppc/ppc405_boards.c

@@ -57,6 +57,8 @@ struct Ppc405MachineState {
     /* Private */
     MachineState parent_obj;
     /* Public */
+
+    Ppc405SoCState soc;
 };
 
 /*****************************************************************************/
@@ -232,11 +234,10 @@ static void boot_from_kernel(MachineState *machine, PowerPCCPU *cpu)
 
 static void ppc405_init(MachineState *machine)
 {
+    Ppc405MachineState *ppc405 = PPC405_MACHINE(machine);
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     const char *kernel_filename = machine->kernel_filename;
     PowerPCCPU *cpu;
-    MemoryRegion *ram_memories = g_new(MemoryRegion, 2);
-    hwaddr ram_bases[2], ram_sizes[2];
     MemoryRegion *sysmem = get_system_memory();
     DeviceState *uicdev;
 
@@ -247,16 +248,16 @@ static void ppc405_init(MachineState *machine)
         exit(EXIT_FAILURE);
     }
 
-    /* XXX: fix this */
-    memory_region_init_alias(&ram_memories[0], NULL, "ef405ep.ram.alias",
-                             machine->ram, 0, machine->ram_size);
-    ram_bases[0] = 0;
-    ram_sizes[0] = machine->ram_size;
-    memory_region_init(&ram_memories[1], NULL, "ef405ep.ram1", 0);
-    ram_bases[1] = 0x00000000;
-    ram_sizes[1] = 0x00000000;
+    object_initialize_child(OBJECT(machine), "soc", &ppc405->soc,
+                            TYPE_PPC405_SOC);
+    object_property_set_uint(OBJECT(&ppc405->soc), "ram-size",
+                             machine->ram_size, &error_fatal);
+    object_property_set_link(OBJECT(&ppc405->soc), "dram",
+                             OBJECT(machine->ram), &error_abort);
+    qdev_realize(DEVICE(&ppc405->soc), NULL, &error_fatal);
 
-    cpu = ppc405ep_init(sysmem, ram_memories, ram_bases, ram_sizes,
+    cpu = ppc405ep_init(sysmem, ppc405->soc.ram_banks, ppc405->soc.ram_bases,
+                        ppc405->soc.ram_sizes,
                         33333333, &uicdev, kernel_filename == NULL ? 0 : 1);
 
     /* allocate and load BIOS */

hw/ppc/ppc405_uc.c

@@ -30,6 +30,7 @@
 #include "hw/ppc/ppc.h"
 #include "hw/i2c/ppc4xx_i2c.h"
 #include "hw/irq.h"
+#include "hw/qdev-properties.h"
 #include "ppc405.h"
 #include "hw/char/serial.h"
 #include "qemu/timer.h"
@@ -1530,3 +1531,42 @@ PowerPCCPU *ppc405ep_init(MemoryRegion *address_space_mem,
 
     return cpu;
 }
+
+static void ppc405_soc_realize(DeviceState *dev, Error **errp)
+{
+    Ppc405SoCState *s = PPC405_SOC(dev);
+
+    /* Initialize only one bank */
+    s->ram_bases[0] = 0;
+    s->ram_sizes[0] = s->ram_size;
+    memory_region_init_alias(&s->ram_banks[0], OBJECT(s),
+                             "ppc405.sdram0", s->dram_mr,
+                             s->ram_bases[0], s->ram_sizes[0]);
+}
+
+static Property ppc405_soc_properties[] = {
+    DEFINE_PROP_LINK("dram", Ppc405SoCState, dram_mr, TYPE_MEMORY_REGION,
+                     MemoryRegion *),
+    DEFINE_PROP_UINT64("ram-size", Ppc405SoCState, ram_size, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void ppc405_soc_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = ppc405_soc_realize;
+    dc->user_creatable = false;
+    device_class_set_props(dc, ppc405_soc_properties);
+}
+
+static const TypeInfo ppc405_types[] = {
+    {
+        .name           = TYPE_PPC405_SOC,
+        .parent         = TYPE_DEVICE,
+        .instance_size  = sizeof(Ppc405SoCState),
+        .class_init     = ppc405_soc_class_init,
+    }
+};
+
+DEFINE_TYPES(ppc405_types)