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lm32: add Milkymist VGAFB support

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This patch adds support for Milkymist's VGA framebuffer.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Michael Walle 2011-03-07 23:32:42 +01:00 committed by Edgar E. Iglesias
parent 883de16b46
commit d23948b15a
4 changed files with 398 additions and 0 deletions
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2
Makefile.target
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@ -276,6 +276,8 @@ obj-lm32-y += milkymist-softusb.o
obj-lm32-y += milkymist-sysctl.o
obj-lm32-$(CONFIG_OPENGL) += milkymist-tmu2.o
obj-lm32-y += milkymist-uart.o
obj-lm32-y += milkymist-vgafb.o
obj-lm32-y += framebuffer.o
obj-mips-y = mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
obj-mips-y += mips_addr.o mips_timer.o mips_int.o

318
hw/milkymist-vgafb.c Normal file
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@ -0,0 +1,318 @@
/*
* QEMU model of the Milkymist VGA framebuffer.
*
* Copyright (c) 2010 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_SOURCE_CLOCK,
R_MAX
};
enum {
CTRL_RESET = (1<<0),
};
struct MilkymistVgafbState {
SysBusDevice busdev;
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,
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 uint32_t vgafb_read(void *opaque, target_phys_addr_t addr)
{
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_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, uint32_t value)
{
MilkymistVgafbState *s = opaque;
trace_milkymist_vgafb_memory_write(addr, value);
addr >>= 2;
switch (addr) {
case R_CTRL:
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_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 CPUReadMemoryFunc * const vgafb_read_fn[] = {
NULL,
NULL,
&vgafb_read
};
static CPUWriteMemoryFunc * const vgafb_write_fn[] = {
NULL,
NULL,
&vgafb_write
};
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);
int vgafb_regs;
vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);
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 SysBusDeviceInfo milkymist_vgafb_info = {
.init = milkymist_vgafb_init,
.qdev.name = "milkymist-vgafb",
.qdev.size = sizeof(MilkymistVgafbState),
.qdev.vmsd = &vmstate_milkymist_vgafb,
.qdev.reset = milkymist_vgafb_reset,
.qdev.props = (Property[]) {
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_register(void)
{
sysbus_register_withprop(&milkymist_vgafb_info);
}
device_init(milkymist_vgafb_register)

74
hw/milkymist-vgafb_template.h Normal file
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@ -0,0 +1,74 @@
/*
* QEMU model of the Milkymist VGA framebuffer.
*
* Copyright (c) 2010 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/>.
*
*/
#if BITS == 8
#define COPY_PIXEL(to, r, g, b) \
do { \
*to = rgb_to_pixel8(r, g, b); \
to += 1; \
} while (0)
#elif BITS == 15
#define COPY_PIXEL(to, r, g, b) \
do { \
*(uint16_t *)to = rgb_to_pixel15(r, g, b); \
to += 2; \
} while (0)
#elif BITS == 16
#define COPY_PIXEL(to, r, g, b) \
do { \
*(uint16_t *)to = rgb_to_pixel16(r, g, b); \
to += 2; \
} while (0)
#elif BITS == 24
#define COPY_PIXEL(to, r, g, b) \
do { \
uint32 tmp = rgb_to_pixel24(r, g, b); \
*(to++) = tmp & 0xff; \
*(to++) = (tmp >> 8) & 0xff; \
*(to++) = (tmp >> 16) & 0xff; \
} while (0)
#elif BITS == 32
#define COPY_PIXEL(to, r, g, b) \
do { \
*(uint32_t *)to = rgb_to_pixel32(r, g, b); \
to += 4; \
} while (0)
#else
#error unknown bit depth
#endif
static void glue(draw_line_, BITS)(void *opaque, uint8_t *d, const uint8_t *s,
int width, int deststep)
{
uint16_t rgb565;
uint8_t r, g, b;
while (width--) {
rgb565 = lduw_raw(s);
r = ((rgb565 >> 11) & 0x1f) << 3;
g = ((rgb565 >> 5) & 0x3f) << 2;
b = ((rgb565 >> 0) & 0x1f) << 3;
COPY_PIXEL(d, r, g, b);
s += 2;
}
}
#undef BITS
#undef COPY_PIXEL

4
trace-events
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@ -355,3 +355,7 @@ disable milkymist_uart_memory_read(uint32_t addr, uint32_t value) "addr %08x val
disable milkymist_uart_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
disable milkymist_uart_pulse_irq_rx(void) "Pulse IRQ RX"
disable milkymist_uart_pulse_irq_tx(void) "Pulse IRQ TX"
# hw/milkymist-vgafb.c
disable milkymist_vgafb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
disable milkymist_vgafb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"