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://www.milkymist.org/socdoc/vgafb.pdf
26 #include "hw/sysbus.h"
28 #include "ui/console.h"
29 #include "framebuffer.h"
30 #include "ui/pixel_ops.h"
31 #include "qemu/error-report.h"
34 #include "milkymist-vgafb_template.h"
36 #include "milkymist-vgafb_template.h"
38 #include "milkymist-vgafb_template.h"
40 #include "milkymist-vgafb_template.h"
42 #include "milkymist-vgafb_template.h"
66 #define TYPE_MILKYMIST_VGAFB "milkymist-vgafb"
67 #define MILKYMIST_VGAFB(obj) \
68 OBJECT_CHECK(MilkymistVgafbState, (obj), TYPE_MILKYMIST_VGAFB)
70 struct MilkymistVgafbState {
71 SysBusDevice parent_obj;
73 MemoryRegion regs_region;
74 MemoryRegionSection fbsection;
83 typedef struct MilkymistVgafbState MilkymistVgafbState;
85 static int vgafb_enabled(MilkymistVgafbState *s)
87 return !(s->regs[R_CTRL] & CTRL_RESET);
90 static void vgafb_update_display(void *opaque)
92 MilkymistVgafbState *s = opaque;
94 DisplaySurface *surface = qemu_console_surface(s->con);
100 if (!vgafb_enabled(s)) {
104 sbd = SYS_BUS_DEVICE(s);
105 int dest_width = s->regs[R_HRES];
107 switch (surface_bits_per_pixel(surface)) {
130 hw_error("milkymist_vgafb: bad color depth\n");
134 src_width = s->regs[R_HRES] * 2;
136 framebuffer_update_memory_section(&s->fbsection,
137 sysbus_address_space(sbd),
138 s->regs[R_BASEADDRESS] + s->fb_offset,
139 s->regs[R_VRES], src_width);
142 framebuffer_update_display(surface, &s->fbsection,
154 dpy_gfx_update(s->con, 0, first, s->regs[R_HRES], last - first + 1);
159 static void vgafb_invalidate_display(void *opaque)
161 MilkymistVgafbState *s = opaque;
165 static void vgafb_resize(MilkymistVgafbState *s)
167 if (!vgafb_enabled(s)) {
171 qemu_console_resize(s->con, s->regs[R_HRES], s->regs[R_VRES]);
175 static uint64_t vgafb_read(void *opaque, hwaddr addr,
178 MilkymistVgafbState *s = opaque;
198 case R_BASEADDRESS_ACT:
199 r = s->regs[R_BASEADDRESS];
203 error_report("milkymist_vgafb: read access to unknown register 0x"
204 TARGET_FMT_plx, addr << 2);
208 trace_milkymist_vgafb_memory_read(addr << 2, r);
213 static void vgafb_write(void *opaque, hwaddr addr, uint64_t value,
216 MilkymistVgafbState *s = opaque;
218 trace_milkymist_vgafb_memory_write(addr, value);
223 s->regs[addr] = value;
235 s->regs[addr] = value;
239 error_report("milkymist_vgafb: framebuffer base address have to "
240 "be 32 byte aligned");
243 s->regs[addr] = value & s->fb_mask;
248 s->regs[addr] = value;
251 case R_BASEADDRESS_ACT:
252 error_report("milkymist_vgafb: write to read-only register 0x"
253 TARGET_FMT_plx, addr << 2);
257 error_report("milkymist_vgafb: write access to unknown register 0x"
258 TARGET_FMT_plx, addr << 2);
263 static const MemoryRegionOps vgafb_mmio_ops = {
265 .write = vgafb_write,
267 .min_access_size = 4,
268 .max_access_size = 4,
270 .endianness = DEVICE_NATIVE_ENDIAN,
273 static void milkymist_vgafb_reset(DeviceState *d)
275 MilkymistVgafbState *s = MILKYMIST_VGAFB(d);
278 for (i = 0; i < R_MAX; i++) {
283 s->regs[R_CTRL] = CTRL_RESET;
284 s->regs[R_HRES] = 640;
285 s->regs[R_VRES] = 480;
286 s->regs[R_BASEADDRESS] = 0;
289 static const GraphicHwOps vgafb_ops = {
290 .invalidate = vgafb_invalidate_display,
291 .gfx_update = vgafb_update_display,
294 static int milkymist_vgafb_init(SysBusDevice *dev)
296 MilkymistVgafbState *s = MILKYMIST_VGAFB(dev);
298 memory_region_init_io(&s->regs_region, OBJECT(s), &vgafb_mmio_ops, s,
299 "milkymist-vgafb", R_MAX * 4);
300 sysbus_init_mmio(dev, &s->regs_region);
302 s->con = graphic_console_init(DEVICE(dev), 0, &vgafb_ops, s);
307 static int vgafb_post_load(void *opaque, int version_id)
309 vgafb_invalidate_display(opaque);
313 static const VMStateDescription vmstate_milkymist_vgafb = {
314 .name = "milkymist-vgafb",
316 .minimum_version_id = 1,
317 .post_load = vgafb_post_load,
318 .fields = (VMStateField[]) {
319 VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
320 VMSTATE_END_OF_LIST()
324 static Property milkymist_vgafb_properties[] = {
325 DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
326 DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
327 DEFINE_PROP_END_OF_LIST(),
330 static void milkymist_vgafb_class_init(ObjectClass *klass, void *data)
332 DeviceClass *dc = DEVICE_CLASS(klass);
333 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
335 k->init = milkymist_vgafb_init;
336 dc->reset = milkymist_vgafb_reset;
337 dc->vmsd = &vmstate_milkymist_vgafb;
338 dc->props = milkymist_vgafb_properties;
341 static const TypeInfo milkymist_vgafb_info = {
342 .name = TYPE_MILKYMIST_VGAFB,
343 .parent = TYPE_SYS_BUS_DEVICE,
344 .instance_size = sizeof(MilkymistVgafbState),
345 .class_init = milkymist_vgafb_class_init,
348 static void milkymist_vgafb_register_types(void)
350 type_register_static(&milkymist_vgafb_info);
353 type_init(milkymist_vgafb_register_types)