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qemu/hw/milkymist-vgafb.c

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/*
* QEMU model of the Milkymist VGA framebuffer.
*
* Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*
* Specification available at:
* http://www.milkymist.org/socdoc/vgafb.pdf
*/
#include "hw.h"
#include "sysbus.h"
#include "trace.h"
#include "console.h"
#include "framebuffer.h"
#include "pixel_ops.h"
#include "qemu-error.h"
#define BITS 8
#include "milkymist-vgafb_template.h"
#define BITS 15
#include "milkymist-vgafb_template.h"
#define BITS 16
#include "milkymist-vgafb_template.h"
#define BITS 24
#include "milkymist-vgafb_template.h"
#define BITS 32
#include "milkymist-vgafb_template.h"
enum {
R_CTRL = 0,
R_HRES,
R_HSYNC_START,
R_HSYNC_END,
R_HSCAN,
R_VRES,
R_VSYNC_START,
R_VSYNC_END,
R_VSCAN,
R_BASEADDRESS,
R_BASEADDRESS_ACT,
R_BURST_COUNT,
R_DDC,
R_SOURCE_CLOCK,
R_MAX
};
enum {
CTRL_RESET = (1<<0),
};
struct MilkymistVgafbState {
SysBusDevice busdev;
MemoryRegion regs_region;
DisplayState *ds;
int invalidate;
uint32_t fb_offset;
uint32_t fb_mask;
uint32_t regs[R_MAX];
};
typedef struct MilkymistVgafbState MilkymistVgafbState;
static int vgafb_enabled(MilkymistVgafbState *s)
{
return !(s->regs[R_CTRL] & CTRL_RESET);
}
static void vgafb_update_display(void *opaque)
{
MilkymistVgafbState *s = opaque;
int first = 0;
int last = 0;
drawfn fn;
if (!vgafb_enabled(s)) {
return;
}
int dest_width = s->regs[R_HRES];
switch (ds_get_bits_per_pixel(s->ds)) {
case 0:
return;
case 8:
fn = draw_line_8;
break;
case 15:
fn = draw_line_15;
dest_width *= 2;
break;
case 16:
fn = draw_line_16;
dest_width *= 2;
break;
case 24:
fn = draw_line_24;
dest_width *= 3;
break;
case 32:
fn = draw_line_32;
dest_width *= 4;
break;
default:
hw_error("milkymist_vgafb: bad color depth\n");
break;
}
framebuffer_update_display(s->ds, sysbus_address_space(&s->busdev),
s->regs[R_BASEADDRESS] + s->fb_offset,
s->regs[R_HRES],
s->regs[R_VRES],
s->regs[R_HRES] * 2,
dest_width,
0,
s->invalidate,
fn,
NULL,
&first, &last);
if (first >= 0) {
dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1);
}
s->invalidate = 0;
}
static void vgafb_invalidate_display(void *opaque)
{
MilkymistVgafbState *s = opaque;
s->invalidate = 1;
}
static void vgafb_resize(MilkymistVgafbState *s)
{
if (!vgafb_enabled(s)) {
return;
}
qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]);
s->invalidate = 1;
}
static uint64_t vgafb_read(void *opaque, target_phys_addr_t addr,
unsigned size)
{
MilkymistVgafbState *s = opaque;
uint32_t r = 0;
addr >>= 2;
switch (addr) {
case R_CTRL:
case R_HRES:
case R_HSYNC_START:
case R_HSYNC_END:
case R_HSCAN:
case R_VRES:
case R_VSYNC_START:
case R_VSYNC_END:
case R_VSCAN:
case R_BASEADDRESS:
case R_BURST_COUNT:
case R_DDC:
case R_SOURCE_CLOCK:
r = s->regs[addr];
break;
case R_BASEADDRESS_ACT:
r = s->regs[R_BASEADDRESS];
break;
default:
error_report("milkymist_vgafb: read access to unknown register 0x"
TARGET_FMT_plx, addr << 2);
break;
}
trace_milkymist_vgafb_memory_read(addr << 2, r);
return r;
}
static void vgafb_write(void *opaque, target_phys_addr_t addr, uint64_t value,
unsigned size)
{
MilkymistVgafbState *s = opaque;
trace_milkymist_vgafb_memory_write(addr, value);
addr >>= 2;
switch (addr) {
case R_CTRL:
s->regs[addr] = value;
vgafb_resize(s);
break;
case R_HSYNC_START:
case R_HSYNC_END:
case R_HSCAN:
case R_VSYNC_START:
case R_VSYNC_END:
case R_VSCAN:
case R_BURST_COUNT:
case R_DDC:
case R_SOURCE_CLOCK:
s->regs[addr] = value;
break;
case R_BASEADDRESS:
if (value & 0x1f) {
error_report("milkymist_vgafb: framebuffer base address have to "
"be 32 byte aligned");
break;
}
s->regs[addr] = value & s->fb_mask;
s->invalidate = 1;
break;
case R_HRES:
case R_VRES:
s->regs[addr] = value;
vgafb_resize(s);
break;
case R_BASEADDRESS_ACT:
error_report("milkymist_vgafb: write to read-only register 0x"
TARGET_FMT_plx, addr << 2);
break;
default:
error_report("milkymist_vgafb: write access to unknown register 0x"
TARGET_FMT_plx, addr << 2);
break;
}
}
static const MemoryRegionOps vgafb_mmio_ops = {
.read = vgafb_read,
.write = vgafb_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void milkymist_vgafb_reset(DeviceState *d)
{
MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev);
int i;
for (i = 0; i < R_MAX; i++) {
s->regs[i] = 0;
}
/* defaults */
s->regs[R_CTRL] = CTRL_RESET;
s->regs[R_HRES] = 640;
s->regs[R_VRES] = 480;
s->regs[R_BASEADDRESS] = 0;
}
static int milkymist_vgafb_init(SysBusDevice *dev)
{
MilkymistVgafbState *s = FROM_SYSBUS(typeof(*s), dev);
memory_region_init_io(&s->regs_region, &vgafb_mmio_ops, s,
"milkymist-vgafb", R_MAX * 4);
sysbus_init_mmio(dev, &s->regs_region);
s->ds = graphic_console_init(vgafb_update_display,
vgafb_invalidate_display,
NULL, NULL, s);
return 0;
}
static int vgafb_post_load(void *opaque, int version_id)
{
vgafb_invalidate_display(opaque);
return 0;
}
static const VMStateDescription vmstate_milkymist_vgafb = {
.name = "milkymist-vgafb",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.post_load = vgafb_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
VMSTATE_END_OF_LIST()
}
};
static Property milkymist_vgafb_properties[] = {
DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
DEFINE_PROP_END_OF_LIST(),
};
static void milkymist_vgafb_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = milkymist_vgafb_init;
dc->reset = milkymist_vgafb_reset;
dc->vmsd = &vmstate_milkymist_vgafb;
dc->props = milkymist_vgafb_properties;
}
static TypeInfo milkymist_vgafb_info = {
.name = "milkymist-vgafb",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MilkymistVgafbState),
.class_init = milkymist_vgafb_class_init,
};
static void milkymist_vgafb_register_types(void)
{
type_register_static(&milkymist_vgafb_info);
}
type_init(milkymist_vgafb_register_types)
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