[PATCH-for-7.0 3/5] hw/display/vga-mmio: QOM'ify vga_mmio_init() as TYPE_VGA_MMIO

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Introduce TYPE_VGA_MMIO, a sysbus device.

While there is no change in the vga_mmio_init()
interface, this is a migration compatibility break
of the MIPS Acer Pica 61 Jazz machine (pica61).

Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/display/vga-mmio.c | 134 +++++++++++++++++++++++++++++-------------
 1 file changed, 94 insertions(+), 40 deletions(-)

diff --git a/hw/display/vga-mmio.c b/hw/display/vga-mmio.c
index 0aefbcf53a0..d1c5f31c134 100644
--- a/hw/display/vga-mmio.c
+++ b/hw/display/vga-mmio.c
@@ -2,6 +2,7 @@
  * QEMU MMIO VGA Emulator.
  *
  * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2021 Philippe Mathieu-Daudé
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -23,21 +24,34 @@
  */
 
 #include "qemu/osdep.h"
-#include "qemu/bitops.h"
-#include "qemu/units.h"
-#include "migration/vmstate.h"
+#include "qapi/error.h"
 #include "hw/display/vga.h"
+#include "hw/sysbus.h"
+#include "hw/qdev-properties.h"
 #include "vga_int.h"
-#include "ui/pixel_ops.h"
 
-#define VGA_RAM_SIZE (8 * MiB)
+/*
+ * QEMU interface:
+ *  + sysbus MMIO region 0: VGA I/O registers
+ *  + sysbus MMIO region 1: VGA MMIO registers
+ *  + sysbus MMIO region 2: VGA memory
+ */
 
-typedef struct VGAMmioState {
+#define TYPE_VGA_MMIO "vga-mmio"
+OBJECT_DECLARE_SIMPLE_TYPE(VGAMmioState, VGA_MMIO)
+
+struct VGAMmioState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
     VGACommonState vga;
-    int it_shift;
-} VGAMmioState;
+    MemoryRegion iomem;
+    MemoryRegion lowmem;
+
+    uint8_t it_shift;
+};
 
-/* Memory mapped interface */
 static uint64_t vga_mm_read(void *opaque, hwaddr addr, unsigned size)
 {
     VGAMmioState *s = opaque;
@@ -65,43 +79,83 @@ static const MemoryRegionOps vga_mm_ctrl_ops = {
     .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
+static void vga_mmio_reset(DeviceState *dev)
+{
+    VGAMmioState *d = VGA_MMIO(dev);
+    VGACommonState *s = &d->vga;
+
+    vga_common_reset(s);
+}
+
 int vga_mmio_init(hwaddr vram_base,
                     hwaddr ctrl_base, int it_shift,
                     MemoryRegion *address_space)
 {
-    VGAMmioState *s;
-    MemoryRegion *s_ioport_ctrl, *vga_io_memory;
+    DeviceState *dev;
+    SysBusDevice *s;
 
-    s = g_malloc0(sizeof(*s));
+    dev = qdev_new(TYPE_VGA_MMIO);
+    qdev_prop_set_uint8(dev, "it_shift", it_shift);
+    s = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(s, &error_fatal);
 
-    s->vga.vram_size_mb = VGA_RAM_SIZE / MiB;
-    s->vga.global_vmstate = true;
-    vga_common_init(&s->vga, NULL);
-
-    s->it_shift = it_shift;
-    s_ioport_ctrl = g_malloc(sizeof(*s_ioport_ctrl));
-    memory_region_init_io(s_ioport_ctrl, NULL, &vga_mm_ctrl_ops, s,
-                          "vga-mm-ctrl", 0x100000);
-    memory_region_set_flush_coalesced(s_ioport_ctrl);
-
-    vga_io_memory = g_malloc(sizeof(*vga_io_memory));
-    /* XXX: endianness? */
-    memory_region_init_io(vga_io_memory, NULL, &vga_mem_ops, &s->vga,
-                          "vga-mem", 0x20000);
-
-    vmstate_register(NULL, 0, &vmstate_vga_common, s);
-
-    memory_region_add_subregion(address_space, ctrl_base, s_ioport_ctrl);
-    s->vga.bank_offset = 0;
-    memory_region_add_subregion(address_space,
-                                vram_base + 0x000a0000, vga_io_memory);
-    memory_region_set_coalescing(vga_io_memory);
-
-    s->vga.con = graphic_console_init(NULL, 0, s->vga.hw_ops, s);
-
-    memory_region_add_subregion(address_space,
-                                VBE_DISPI_LFB_PHYSICAL_ADDRESS,
-                                &s->vga.vram);
+    sysbus_mmio_map(s, 0, ctrl_base);
+    sysbus_mmio_map(s, 1, vram_base + 0x000a0000);
+    sysbus_mmio_map(s, 2, VBE_DISPI_LFB_PHYSICAL_ADDRESS);
 
     return 0;
 }
+
+static void vga_mmio_realizefn(DeviceState *dev, Error **errp)
+{
+    VGAMmioState *s = VGA_MMIO(dev);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+    memory_region_init_io(&s->iomem, OBJECT(dev), &vga_mm_ctrl_ops, s,
+                          "vga-mmio", 0x100000);
+    memory_region_set_flush_coalesced(&s->iomem);
+    sysbus_init_mmio(sbd, &s->iomem);
+
+    /* XXX: endianness? */
+    memory_region_init_io(&s->lowmem, OBJECT(dev), &vga_mem_ops, &s->vga,
+                          "vga-lowmem", 0x20000);
+    memory_region_set_coalescing(&s->lowmem);
+    sysbus_init_mmio(sbd, &s->lowmem);
+
+    s->vga.bank_offset = 0;
+    s->vga.global_vmstate = true;
+    vga_common_init(&s->vga, OBJECT(dev));
+    sysbus_init_mmio(sbd, &s->vga.vram);
+    s->vga.con = graphic_console_init(dev, 0, s->vga.hw_ops, &s->vga);
+}
+
+static Property vga_mmio_properties[] = {
+    DEFINE_PROP_UINT8("it_shift", VGAMmioState, it_shift, 0),
+    DEFINE_PROP_UINT32("vgamem_mb", VGAMmioState, vga.vram_size_mb, 8),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vga_mmio_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = vga_mmio_realizefn;
+    dc->reset = vga_mmio_reset;
+    dc->vmsd = &vmstate_vga_common;
+    device_class_set_props(dc, vga_mmio_properties);
+    set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
+}
+
+static const TypeInfo vga_mmio_info = {
+    .name          = TYPE_VGA_MMIO,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(VGAMmioState),
+    .class_init    = vga_mmio_class_initfn,
+};
+
+static void vga_mmio_register_types(void)
+{
+    type_register_static(&vga_mmio_info);
+}
+
+type_init(vga_mmio_register_types)
-- 
2.31.1