3 * QEMU model of the Milkymist VGA framebuffer.
5 * Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
21 * Specification available at:
22 * http://milkymist.walle.cc/socdoc/vgafb.pdf
25 #include "qemu/osdep.h"
27 #include "hw/qdev-properties.h"
28 #include "hw/sysbus.h"
30 #include "ui/console.h"
31 #include "framebuffer.h"
32 #include "ui/pixel_ops.h"
33 #include "qemu/error-report.h"
34 #include "qemu/module.h"
35 #include "qom/object.h"
38 #include "migration/vmstate.h"
39 #include "milkymist-vgafb_template.h"
41 #include "milkymist-vgafb_template.h"
43 #include "milkymist-vgafb_template.h"
45 #include "milkymist-vgafb_template.h"
47 #include "milkymist-vgafb_template.h"
71 #define TYPE_MILKYMIST_VGAFB "milkymist-vgafb"
72 OBJECT_DECLARE_SIMPLE_TYPE(MilkymistVgafbState, MILKYMIST_VGAFB)
74 struct MilkymistVgafbState {
75 SysBusDevice parent_obj;
77 MemoryRegion regs_region;
78 MemoryRegionSection fbsection;
88 static int vgafb_enabled(MilkymistVgafbState *s)
90 return !(s->regs[R_CTRL] & CTRL_RESET);
93 static void vgafb_update_display(void *opaque)
95 MilkymistVgafbState *s = opaque;
97 DisplaySurface *surface = qemu_console_surface(s->con);
103 if (!vgafb_enabled(s)) {
107 sbd = SYS_BUS_DEVICE(s);
108 int dest_width = s->regs[R_HRES];
110 switch (surface_bits_per_pixel(surface)) {
133 hw_error("milkymist_vgafb: bad color depth\n");
137 src_width = s->regs[R_HRES] * 2;
139 framebuffer_update_memory_section(&s->fbsection,
140 sysbus_address_space(sbd),
141 s->regs[R_BASEADDRESS] + s->fb_offset,
142 s->regs[R_VRES], src_width);
145 framebuffer_update_display(surface, &s->fbsection,
157 dpy_gfx_update(s->con, 0, first, s->regs[R_HRES], last - first + 1);
162 static void vgafb_invalidate_display(void *opaque)
164 MilkymistVgafbState *s = opaque;
168 static void vgafb_resize(MilkymistVgafbState *s)
170 if (!vgafb_enabled(s)) {
174 qemu_console_resize(s->con, s->regs[R_HRES], s->regs[R_VRES]);
178 static uint64_t vgafb_read(void *opaque, hwaddr addr,
181 MilkymistVgafbState *s = opaque;
201 case R_BASEADDRESS_ACT:
202 r = s->regs[R_BASEADDRESS];
206 error_report("milkymist_vgafb: read access to unknown register 0x"
207 TARGET_FMT_plx, addr << 2);
211 trace_milkymist_vgafb_memory_read(addr << 2, r);
216 static void vgafb_write(void *opaque, hwaddr addr, uint64_t value,
219 MilkymistVgafbState *s = opaque;
221 trace_milkymist_vgafb_memory_write(addr, value);
226 s->regs[addr] = value;
238 s->regs[addr] = value;
242 error_report("milkymist_vgafb: framebuffer base address have to "
243 "be 32 byte aligned");
246 s->regs[addr] = value & s->fb_mask;
251 s->regs[addr] = value;
254 case R_BASEADDRESS_ACT:
255 error_report("milkymist_vgafb: write to read-only register 0x"
256 TARGET_FMT_plx, addr << 2);
260 error_report("milkymist_vgafb: write access to unknown register 0x"
261 TARGET_FMT_plx, addr << 2);
266 static const MemoryRegionOps vgafb_mmio_ops = {
268 .write = vgafb_write,
270 .min_access_size = 4,
271 .max_access_size = 4,
273 .endianness = DEVICE_NATIVE_ENDIAN,
276 static void milkymist_vgafb_reset(DeviceState *d)
278 MilkymistVgafbState *s = MILKYMIST_VGAFB(d);
281 for (i = 0; i < R_MAX; i++) {
286 s->regs[R_CTRL] = CTRL_RESET;
287 s->regs[R_HRES] = 640;
288 s->regs[R_VRES] = 480;
289 s->regs[R_BASEADDRESS] = 0;
292 static const GraphicHwOps vgafb_ops = {
293 .invalidate = vgafb_invalidate_display,
294 .gfx_update = vgafb_update_display,
297 static void milkymist_vgafb_init(Object *obj)
299 MilkymistVgafbState *s = MILKYMIST_VGAFB(obj);
300 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
302 memory_region_init_io(&s->regs_region, OBJECT(s), &vgafb_mmio_ops, s,
303 "milkymist-vgafb", R_MAX * 4);
304 sysbus_init_mmio(dev, &s->regs_region);
307 static void milkymist_vgafb_realize(DeviceState *dev, Error **errp)
309 MilkymistVgafbState *s = MILKYMIST_VGAFB(dev);
311 s->con = graphic_console_init(dev, 0, &vgafb_ops, s);
314 static int vgafb_post_load(void *opaque, int version_id)
316 vgafb_invalidate_display(opaque);
320 static const VMStateDescription vmstate_milkymist_vgafb = {
321 .name = "milkymist-vgafb",
323 .minimum_version_id = 1,
324 .post_load = vgafb_post_load,
325 .fields = (VMStateField[]) {
326 VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
327 VMSTATE_END_OF_LIST()
331 static Property milkymist_vgafb_properties[] = {
332 DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
333 DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
334 DEFINE_PROP_END_OF_LIST(),
337 static void milkymist_vgafb_class_init(ObjectClass *klass, void *data)
339 DeviceClass *dc = DEVICE_CLASS(klass);
341 dc->reset = milkymist_vgafb_reset;
342 dc->vmsd = &vmstate_milkymist_vgafb;
343 device_class_set_props(dc, milkymist_vgafb_properties);
344 dc->realize = milkymist_vgafb_realize;
347 static const TypeInfo milkymist_vgafb_info = {
348 .name = TYPE_MILKYMIST_VGAFB,
349 .parent = TYPE_SYS_BUS_DEVICE,
350 .instance_size = sizeof(MilkymistVgafbState),
351 .instance_init = milkymist_vgafb_init,
352 .class_init = milkymist_vgafb_class_init,
355 static void milkymist_vgafb_register_types(void)
357 type_register_static(&milkymist_vgafb_info);
360 type_init(milkymist_vgafb_register_types)