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-rw-r--r--hw/display/bcm2835_fb.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/hw/display/bcm2835_fb.c b/hw/display/bcm2835_fb.c
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+++ b/hw/display/bcm2835_fb.c
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+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
+ *
+ * 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 2.1 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 "hw/hw.h"
+#include "hw/irq.h"
+#include "framebuffer.h"
+#include "ui/pixel_ops.h"
+#include "hw/misc/bcm2835_mbox_defs.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+
+#define DEFAULT_VCRAM_SIZE 0x4000000
+#define BCM2835_FB_OFFSET 0x00100000
+
+/* Maximum permitted framebuffer size; experimentally determined on an rpi2 */
+#define XRES_MAX 3840
+#define YRES_MAX 2560
+/* Framebuffer size used if guest requests zero size */
+#define XRES_SMALL 592
+#define YRES_SMALL 488
+
+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 bool fb_use_offsets(BCM2835FBConfig *config)
+{
+ /*
+ * Return true if we should use the viewport offsets.
+ * Experimentally, the hardware seems to do this only if the
+ * viewport size is larger than the physical screen. (It doesn't
+ * prevent the guest setting this silly viewport setting, though...)
+ */
+ return config->xres_virtual > config->xres &&
+ config->yres_virtual > config->yres;
+}
+
+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;
+ uint32_t xoff = 0, yoff = 0;
+
+ if (s->lock || !s->config.xres) {
+ return;
+ }
+
+ src_width = bcm2835_fb_get_pitch(&s->config);
+ if (fb_use_offsets(&s->config)) {
+ xoff = s->config.xoffset;
+ yoff = s->config.yoffset;
+ }
+
+ 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) {
+ hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width;
+ framebuffer_update_memory_section(&s->fbsection, s->dma_mr,
+ 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;
+}
+
+void bcm2835_fb_validate_config(BCM2835FBConfig *config)
+{
+ /*
+ * Validate the config, and clip any bogus values into range,
+ * as the hardware does. Note that fb_update_display() relies on
+ * this happening to prevent it from performing out-of-range
+ * accesses on redraw.
+ */
+ config->xres = MIN(config->xres, XRES_MAX);
+ config->xres_virtual = MIN(config->xres_virtual, XRES_MAX);
+ config->yres = MIN(config->yres, YRES_MAX);
+ config->yres_virtual = MIN(config->yres_virtual, YRES_MAX);
+
+ /*
+ * These are not minima: a 40x40 framebuffer will be accepted.
+ * They're only used as defaults if the guest asks for zero size.
+ */
+ if (config->xres == 0) {
+ config->xres = XRES_SMALL;
+ }
+ if (config->yres == 0) {
+ config->yres = YRES_SMALL;
+ }
+ if (config->xres_virtual == 0) {
+ config->xres_virtual = config->xres;
+ }
+ if (config->yres_virtual == 0) {
+ config->yres_virtual = config->yres;
+ }
+
+ if (fb_use_offsets(config)) {
+ /* Clip the offsets so the viewport is within the physical screen */
+ config->xoffset = MIN(config->xoffset,
+ config->xres_virtual - config->xres);
+ config->yoffset = MIN(config->yoffset,
+ config->yres_virtual - config->yres);
+ }
+}
+
+void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig)
+{
+ s->lock = true;
+
+ s->config = *newconfig;
+
+ s->invalidate = true;
+ qemu_console_resize(s->con, s->config.xres, s->config.yres);
+ s->lock = false;
+}
+
+static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value)
+{
+ uint32_t pitch;
+ uint32_t size;
+ BCM2835FBConfig newconf;
+
+ value &= ~0xf;
+
+ newconf.xres = ldl_le_phys(&s->dma_as, value);
+ newconf.yres = ldl_le_phys(&s->dma_as, value + 4);
+ newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8);
+ newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12);
+ newconf.bpp = ldl_le_phys(&s->dma_as, value + 20);
+ newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24);
+ newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28);
+
+ newconf.base = s->vcram_base + BCM2835_FB_OFFSET;
+
+ /* Copy fields which we don't want to change from the existing config */
+ newconf.pixo = s->config.pixo;
+ newconf.alpha = s->config.alpha;
+
+ bcm2835_fb_validate_config(&newconf);
+
+ pitch = bcm2835_fb_get_pitch(&newconf);
+ size = bcm2835_fb_get_size(&newconf);
+
+ stl_le_phys(&s->dma_as, value + 16, pitch);
+ stl_le_phys(&s->dma_as, value + 32, newconf.base);
+ stl_le_phys(&s->dma_as, value + 36, size);
+
+ bcm2835_fb_reconfigure(s, &newconf);
+}
+
+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_UNUSED(8), /* Was pitch and size */
+ 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 = s->initial_config;
+
+ s->invalidate = true;
+ s->lock = false;
+}
+
+static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
+{
+ BCM2835FBState *s = BCM2835_FB(dev);
+ 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", &error_abort);
+
+ /* Fill in the parts of initial_config that are not set by QOM properties */
+ s->initial_config.xres_virtual = s->initial_config.xres;
+ s->initial_config.yres_virtual = s->initial_config.yres;
+ s->initial_config.xoffset = 0;
+ s->initial_config.yoffset = 0;
+ s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET;
+
+ s->dma_mr = MEMORY_REGION(obj);
+ address_space_init(&s->dma_as, s->dma_mr, TYPE_BCM2835_FB "-memory");
+
+ 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, initial_config.xres, 640),
+ DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480),
+ DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16),
+ DEFINE_PROP_UINT32("pixo", BCM2835FBState,
+ initial_config.pixo, 1), /* 1=RGB, 0=BGR */
+ DEFINE_PROP_UINT32("alpha", BCM2835FBState,
+ initial_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);
+
+ device_class_set_props(dc, bcm2835_fb_props);
+ dc->realize = bcm2835_fb_realize;
+ dc->reset = bcm2835_fb_reset;
+ dc->vmsd = &vmstate_bcm2835_fb;
+}
+
+static const 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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