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qemu-patch-raspberry4/hw/display/bcm2835_fb.c
Peter Maydell 193100b571 hw/misc/bcm2835_property: Track fb settings using BCM2835FBConfig 
Refactor the fb property setting code so that rather than
using a set of pointers to local variables to track
whether a config value has been updated in the current
mbox and if so what its new value is, we just copy
all the current settings of the fb at the start, and
then update that copy as we go along, before asking
the fb to switch to it at the end.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-3-peter.maydell@linaro.org
2018-08-24 13:17:48 +01:00

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/*
* Raspberry Pi emulation (c) 2012 Gregory Estrade
* Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
* This code is licensed under the GNU GPLv2 and later.
*
* Heavily based on milkymist-vgafb.c, copyright terms below:
* 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/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/display/bcm2835_fb.h"
#include "framebuffer.h"
#include "ui/pixel_ops.h"
#include "hw/misc/bcm2835_mbox_defs.h"
#include "qemu/log.h"
#define DEFAULT_VCRAM_SIZE 0x4000000
#define BCM2835_FB_OFFSET 0x00100000
static void fb_invalidate_display(void *opaque)
{
BCM2835FBState *s = BCM2835_FB(opaque);
s->invalidate = true;
}
static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src,
int width, int deststep)
{
BCM2835FBState *s = opaque;
uint16_t rgb565;
uint32_t rgb888;
uint8_t r, g, b;
DisplaySurface *surface = qemu_console_surface(s->con);
int bpp = surface_bits_per_pixel(surface);
while (width--) {
switch (s->config.bpp) {
case 8:
/* lookup palette starting at video ram base
* TODO: cache translation, rather than doing this each time!
*/
rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2));
r = (rgb888 >> 0) & 0xff;
g = (rgb888 >> 8) & 0xff;
b = (rgb888 >> 16) & 0xff;
src++;
break;
case 16:
rgb565 = lduw_le_p(src);
r = ((rgb565 >> 11) & 0x1f) << 3;
g = ((rgb565 >> 5) & 0x3f) << 2;
b = ((rgb565 >> 0) & 0x1f) << 3;
src += 2;
break;
case 24:
rgb888 = ldl_le_p(src);
r = (rgb888 >> 0) & 0xff;
g = (rgb888 >> 8) & 0xff;
b = (rgb888 >> 16) & 0xff;
src += 3;
break;
case 32:
rgb888 = ldl_le_p(src);
r = (rgb888 >> 0) & 0xff;
g = (rgb888 >> 8) & 0xff;
b = (rgb888 >> 16) & 0xff;
src += 4;
break;
default:
r = 0;
g = 0;
b = 0;
break;
}
if (s->config.pixo == 0) {
/* swap to BGR pixel format */
uint8_t tmp = r;
r = b;
b = tmp;
}
switch (bpp) {
case 8:
*dst++ = rgb_to_pixel8(r, g, b);
break;
case 15:
*(uint16_t *)dst = rgb_to_pixel15(r, g, b);
dst += 2;
break;
case 16:
*(uint16_t *)dst = rgb_to_pixel16(r, g, b);
dst += 2;
break;
case 24:
rgb888 = rgb_to_pixel24(r, g, b);
*dst++ = rgb888 & 0xff;
*dst++ = (rgb888 >> 8) & 0xff;
*dst++ = (rgb888 >> 16) & 0xff;
break;
case 32:
*(uint32_t *)dst = rgb_to_pixel32(r, g, b);
dst += 4;
break;
default:
return;
}
}
}
static void fb_update_display(void *opaque)
{
BCM2835FBState *s = opaque;
DisplaySurface *surface = qemu_console_surface(s->con);
int first = 0;
int last = 0;
int src_width = 0;
int dest_width = 0;
if (s->lock || !s->config.xres) {
return;
}
src_width = s->config.xres * (s->config.bpp >> 3);
dest_width = s->config.xres;
switch (surface_bits_per_pixel(surface)) {
case 0:
return;
case 8:
break;
case 15:
dest_width *= 2;
break;
case 16:
dest_width *= 2;
break;
case 24:
dest_width *= 3;
break;
case 32:
dest_width *= 4;
break;
default:
hw_error("bcm2835_fb: bad color depth\n");
break;
}
if (s->invalidate) {
framebuffer_update_memory_section(&s->fbsection, s->dma_mr,
s->config.base,
s->config.yres, src_width);
}
framebuffer_update_display(surface, &s->fbsection,
s->config.xres, s->config.yres,
src_width, dest_width, 0, s->invalidate,
draw_line_src16, s, &first, &last);
if (first >= 0) {
dpy_gfx_update(s->con, 0, first, s->config.xres, last - first + 1);
}
s->invalidate = false;
}
static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value)
{
value &= ~0xf;
s->lock = true;
s->config.xres = ldl_le_phys(&s->dma_as, value);
s->config.yres = ldl_le_phys(&s->dma_as, value + 4);
s->config.xres_virtual = ldl_le_phys(&s->dma_as, value + 8);
s->config.yres_virtual = ldl_le_phys(&s->dma_as, value + 12);
s->config.bpp = ldl_le_phys(&s->dma_as, value + 20);
s->config.xoffset = ldl_le_phys(&s->dma_as, value + 24);
s->config.yoffset = ldl_le_phys(&s->dma_as, value + 28);
s->config.base = s->vcram_base | (value & 0xc0000000);
s->config.base += BCM2835_FB_OFFSET;
/* TODO - Manage properly virtual resolution */
s->pitch = s->config.xres * (s->config.bpp >> 3);
s->size = s->config.yres * s->pitch;
stl_le_phys(&s->dma_as, value + 16, s->pitch);
stl_le_phys(&s->dma_as, value + 32, s->config.base);
stl_le_phys(&s->dma_as, value + 36, s->size);
s->invalidate = true;
qemu_console_resize(s->con, s->config.xres, s->config.yres);
s->lock = false;
}
void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig)
{
s->lock = true;
/* TODO: input validation! */
s->config = *newconfig;
/* TODO - Manage properly virtual resolution */
s->pitch = s->config.xres * (s->config.bpp >> 3);
s->size = s->config.yres * s->pitch;
s->invalidate = true;
qemu_console_resize(s->con, s->config.xres, s->config.yres);
s->lock = false;
}
static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size)
{
BCM2835FBState *s = opaque;
uint32_t res = 0;
switch (offset) {
case MBOX_AS_DATA:
res = MBOX_CHAN_FB;
s->pending = false;
qemu_set_irq(s->mbox_irq, 0);
break;
case MBOX_AS_PENDING:
res = s->pending;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
return 0;
}
return res;
}
static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
BCM2835FBState *s = opaque;
switch (offset) {
case MBOX_AS_DATA:
/* bcm2835_mbox should check our pending status before pushing */
assert(!s->pending);
s->pending = true;
bcm2835_fb_mbox_push(s, value);
qemu_set_irq(s->mbox_irq, 1);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
return;
}
}
static const MemoryRegionOps bcm2835_fb_ops = {
.read = bcm2835_fb_read,
.write = bcm2835_fb_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static const VMStateDescription vmstate_bcm2835_fb = {
.name = TYPE_BCM2835_FB,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_BOOL(lock, BCM2835FBState),
VMSTATE_BOOL(invalidate, BCM2835FBState),
VMSTATE_BOOL(pending, BCM2835FBState),
VMSTATE_UINT32(config.xres, BCM2835FBState),
VMSTATE_UINT32(config.yres, BCM2835FBState),
VMSTATE_UINT32(config.xres_virtual, BCM2835FBState),
VMSTATE_UINT32(config.yres_virtual, BCM2835FBState),
VMSTATE_UINT32(config.xoffset, BCM2835FBState),
VMSTATE_UINT32(config.yoffset, BCM2835FBState),
VMSTATE_UINT32(config.bpp, BCM2835FBState),
VMSTATE_UINT32(config.base, BCM2835FBState),
VMSTATE_UINT32(pitch, BCM2835FBState),
VMSTATE_UINT32(size, BCM2835FBState),
VMSTATE_UINT32(config.pixo, BCM2835FBState),
VMSTATE_UINT32(config.alpha, BCM2835FBState),
VMSTATE_END_OF_LIST()
}
};
static const GraphicHwOps vgafb_ops = {
.invalidate = fb_invalidate_display,
.gfx_update = fb_update_display,
};
static void bcm2835_fb_init(Object *obj)
{
BCM2835FBState *s = BCM2835_FB(obj);
memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB,
0x10);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
}
static void bcm2835_fb_reset(DeviceState *dev)
{
BCM2835FBState *s = BCM2835_FB(dev);
s->pending = false;
s->config.xres_virtual = s->config.xres;
s->config.yres_virtual = s->config.yres;
s->config.xoffset = 0;
s->config.yoffset = 0;
s->config.base = s->vcram_base + BCM2835_FB_OFFSET;
s->pitch = s->config.xres * (s->config.bpp >> 3);
s->size = s->config.yres * s->pitch;
s->invalidate = true;
s->lock = false;
}
static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
{
BCM2835FBState *s = BCM2835_FB(dev);
Error *err = NULL;
Object *obj;
if (s->vcram_base == 0) {
error_setg(errp, "%s: required vcram-base property not set", __func__);
return;
}
obj = object_property_get_link(OBJECT(dev), "dma-mr", &err);
if (obj == NULL) {
error_setg(errp, "%s: required dma-mr link not found: %s",
__func__, error_get_pretty(err));
return;
}
s->dma_mr = MEMORY_REGION(obj);
address_space_init(&s->dma_as, s->dma_mr, NULL);
bcm2835_fb_reset(dev);
s->con = graphic_console_init(dev, 0, &vgafb_ops, s);
qemu_console_resize(s->con, s->config.xres, s->config.yres);
}
static Property bcm2835_fb_props[] = {
DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/
DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size,
DEFAULT_VCRAM_SIZE),
DEFINE_PROP_UINT32("xres", BCM2835FBState, config.xres, 640),
DEFINE_PROP_UINT32("yres", BCM2835FBState, config.yres, 480),
DEFINE_PROP_UINT32("bpp", BCM2835FBState, config.bpp, 16),
DEFINE_PROP_UINT32("pixo",
BCM2835FBState, config.pixo, 1), /* 1=RGB, 0=BGR */
DEFINE_PROP_UINT32("alpha",
BCM2835FBState, config.alpha, 2), /* alpha ignored */
DEFINE_PROP_END_OF_LIST()
};
static void bcm2835_fb_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = bcm2835_fb_props;
dc->realize = bcm2835_fb_realize;
dc->reset = bcm2835_fb_reset;
dc->vmsd = &vmstate_bcm2835_fb;
}
static TypeInfo bcm2835_fb_info = {
.name = TYPE_BCM2835_FB,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835FBState),
.class_init = bcm2835_fb_class_init,
.instance_init = bcm2835_fb_init,
};
static void bcm2835_fb_register_types(void)
{
type_register_static(&bcm2835_fb_info);
}
type_init(bcm2835_fb_register_types)
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