2 * Raspberry Pi emulation (c) 2012 Gregory Estrade
3 * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
4 * This code is licensed under the GNU GPLv2 and later.
6 * Heavily based on milkymist-vgafb.c, copyright terms below:
7 * QEMU model of the Milkymist VGA framebuffer.
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "hw/display/bcm2835_fb.h"
31 #include "framebuffer.h"
32 #include "ui/pixel_ops.h"
33 #include "hw/misc/bcm2835_mbox_defs.h"
34 #include "migration/vmstate.h"
36 #include "qemu/module.h"
38 #define DEFAULT_VCRAM_SIZE 0x4000000
39 #define BCM2835_FB_OFFSET 0x00100000
41 /* Maximum permitted framebuffer size; experimentally determined on an rpi2 */
44 /* Framebuffer size used if guest requests zero size */
45 #define XRES_SMALL 592
46 #define YRES_SMALL 488
48 static void fb_invalidate_display(void *opaque)
50 BCM2835FBState *s = BCM2835_FB(opaque);
55 static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src,
56 int width, int deststep)
58 BCM2835FBState *s = opaque;
62 DisplaySurface *surface = qemu_console_surface(s->con);
63 int bpp = surface_bits_per_pixel(surface);
66 switch (s->config.bpp) {
68 /* lookup palette starting at video ram base
69 * TODO: cache translation, rather than doing this each time!
71 rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2));
72 r = (rgb888 >> 0) & 0xff;
73 g = (rgb888 >> 8) & 0xff;
74 b = (rgb888 >> 16) & 0xff;
78 rgb565 = lduw_le_p(src);
79 r = ((rgb565 >> 11) & 0x1f) << 3;
80 g = ((rgb565 >> 5) & 0x3f) << 2;
81 b = ((rgb565 >> 0) & 0x1f) << 3;
85 rgb888 = ldl_le_p(src);
86 r = (rgb888 >> 0) & 0xff;
87 g = (rgb888 >> 8) & 0xff;
88 b = (rgb888 >> 16) & 0xff;
92 rgb888 = ldl_le_p(src);
93 r = (rgb888 >> 0) & 0xff;
94 g = (rgb888 >> 8) & 0xff;
95 b = (rgb888 >> 16) & 0xff;
105 if (s->config.pixo == 0) {
106 /* swap to BGR pixel format */
114 *dst++ = rgb_to_pixel8(r, g, b);
117 *(uint16_t *)dst = rgb_to_pixel15(r, g, b);
121 *(uint16_t *)dst = rgb_to_pixel16(r, g, b);
125 rgb888 = rgb_to_pixel24(r, g, b);
126 *dst++ = rgb888 & 0xff;
127 *dst++ = (rgb888 >> 8) & 0xff;
128 *dst++ = (rgb888 >> 16) & 0xff;
131 *(uint32_t *)dst = rgb_to_pixel32(r, g, b);
140 static bool fb_use_offsets(BCM2835FBConfig *config)
143 * Return true if we should use the viewport offsets.
144 * Experimentally, the hardware seems to do this only if the
145 * viewport size is larger than the physical screen. (It doesn't
146 * prevent the guest setting this silly viewport setting, though...)
148 return config->xres_virtual > config->xres &&
149 config->yres_virtual > config->yres;
152 static void fb_update_display(void *opaque)
154 BCM2835FBState *s = opaque;
155 DisplaySurface *surface = qemu_console_surface(s->con);
160 uint32_t xoff = 0, yoff = 0;
162 if (s->lock || !s->config.xres) {
166 src_width = bcm2835_fb_get_pitch(&s->config);
167 if (fb_use_offsets(&s->config)) {
168 xoff = s->config.xoffset;
169 yoff = s->config.yoffset;
172 dest_width = s->config.xres;
174 switch (surface_bits_per_pixel(surface)) {
192 hw_error("bcm2835_fb: bad color depth\n");
197 hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width;
198 framebuffer_update_memory_section(&s->fbsection, s->dma_mr,
200 s->config.yres, src_width);
203 framebuffer_update_display(surface, &s->fbsection,
204 s->config.xres, s->config.yres,
205 src_width, dest_width, 0, s->invalidate,
206 draw_line_src16, s, &first, &last);
209 dpy_gfx_update(s->con, 0, first, s->config.xres,
213 s->invalidate = false;
216 void bcm2835_fb_validate_config(BCM2835FBConfig *config)
219 * Validate the config, and clip any bogus values into range,
220 * as the hardware does. Note that fb_update_display() relies on
221 * this happening to prevent it from performing out-of-range
222 * accesses on redraw.
224 config->xres = MIN(config->xres, XRES_MAX);
225 config->xres_virtual = MIN(config->xres_virtual, XRES_MAX);
226 config->yres = MIN(config->yres, YRES_MAX);
227 config->yres_virtual = MIN(config->yres_virtual, YRES_MAX);
230 * These are not minima: a 40x40 framebuffer will be accepted.
231 * They're only used as defaults if the guest asks for zero size.
233 if (config->xres == 0) {
234 config->xres = XRES_SMALL;
236 if (config->yres == 0) {
237 config->yres = YRES_SMALL;
239 if (config->xres_virtual == 0) {
240 config->xres_virtual = config->xres;
242 if (config->yres_virtual == 0) {
243 config->yres_virtual = config->yres;
246 if (fb_use_offsets(config)) {
247 /* Clip the offsets so the viewport is within the physical screen */
248 config->xoffset = MIN(config->xoffset,
249 config->xres_virtual - config->xres);
250 config->yoffset = MIN(config->yoffset,
251 config->yres_virtual - config->yres);
255 void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig)
259 s->config = *newconfig;
261 s->invalidate = true;
262 qemu_console_resize(s->con, s->config.xres, s->config.yres);
266 static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value)
270 BCM2835FBConfig newconf;
274 newconf.xres = ldl_le_phys(&s->dma_as, value);
275 newconf.yres = ldl_le_phys(&s->dma_as, value + 4);
276 newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8);
277 newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12);
278 newconf.bpp = ldl_le_phys(&s->dma_as, value + 20);
279 newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24);
280 newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28);
282 newconf.base = s->vcram_base | (value & 0xc0000000);
283 newconf.base += BCM2835_FB_OFFSET;
285 bcm2835_fb_validate_config(&newconf);
287 pitch = bcm2835_fb_get_pitch(&newconf);
288 size = bcm2835_fb_get_size(&newconf);
290 stl_le_phys(&s->dma_as, value + 16, pitch);
291 stl_le_phys(&s->dma_as, value + 32, newconf.base);
292 stl_le_phys(&s->dma_as, value + 36, size);
294 bcm2835_fb_reconfigure(s, &newconf);
297 static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size)
299 BCM2835FBState *s = opaque;
306 qemu_set_irq(s->mbox_irq, 0);
309 case MBOX_AS_PENDING:
314 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
322 static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value,
325 BCM2835FBState *s = opaque;
329 /* bcm2835_mbox should check our pending status before pushing */
332 bcm2835_fb_mbox_push(s, value);
333 qemu_set_irq(s->mbox_irq, 1);
337 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
343 static const MemoryRegionOps bcm2835_fb_ops = {
344 .read = bcm2835_fb_read,
345 .write = bcm2835_fb_write,
346 .endianness = DEVICE_NATIVE_ENDIAN,
347 .valid.min_access_size = 4,
348 .valid.max_access_size = 4,
351 static const VMStateDescription vmstate_bcm2835_fb = {
352 .name = TYPE_BCM2835_FB,
354 .minimum_version_id = 1,
355 .fields = (VMStateField[]) {
356 VMSTATE_BOOL(lock, BCM2835FBState),
357 VMSTATE_BOOL(invalidate, BCM2835FBState),
358 VMSTATE_BOOL(pending, BCM2835FBState),
359 VMSTATE_UINT32(config.xres, BCM2835FBState),
360 VMSTATE_UINT32(config.yres, BCM2835FBState),
361 VMSTATE_UINT32(config.xres_virtual, BCM2835FBState),
362 VMSTATE_UINT32(config.yres_virtual, BCM2835FBState),
363 VMSTATE_UINT32(config.xoffset, BCM2835FBState),
364 VMSTATE_UINT32(config.yoffset, BCM2835FBState),
365 VMSTATE_UINT32(config.bpp, BCM2835FBState),
366 VMSTATE_UINT32(config.base, BCM2835FBState),
367 VMSTATE_UNUSED(8), /* Was pitch and size */
368 VMSTATE_UINT32(config.pixo, BCM2835FBState),
369 VMSTATE_UINT32(config.alpha, BCM2835FBState),
370 VMSTATE_END_OF_LIST()
374 static const GraphicHwOps vgafb_ops = {
375 .invalidate = fb_invalidate_display,
376 .gfx_update = fb_update_display,
379 static void bcm2835_fb_init(Object *obj)
381 BCM2835FBState *s = BCM2835_FB(obj);
383 memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB,
385 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
386 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
389 static void bcm2835_fb_reset(DeviceState *dev)
391 BCM2835FBState *s = BCM2835_FB(dev);
395 s->config = s->initial_config;
397 s->invalidate = true;
401 static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
403 BCM2835FBState *s = BCM2835_FB(dev);
407 if (s->vcram_base == 0) {
408 error_setg(errp, "%s: required vcram-base property not set", __func__);
412 obj = object_property_get_link(OBJECT(dev), "dma-mr", &err);
414 error_setg(errp, "%s: required dma-mr link not found: %s",
415 __func__, error_get_pretty(err));
419 /* Fill in the parts of initial_config that are not set by QOM properties */
420 s->initial_config.xres_virtual = s->initial_config.xres;
421 s->initial_config.yres_virtual = s->initial_config.yres;
422 s->initial_config.xoffset = 0;
423 s->initial_config.yoffset = 0;
424 s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET;
426 s->dma_mr = MEMORY_REGION(obj);
427 address_space_init(&s->dma_as, s->dma_mr, NULL);
429 bcm2835_fb_reset(dev);
431 s->con = graphic_console_init(dev, 0, &vgafb_ops, s);
432 qemu_console_resize(s->con, s->config.xres, s->config.yres);
435 static Property bcm2835_fb_props[] = {
436 DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/
437 DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size,
439 DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640),
440 DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480),
441 DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16),
442 DEFINE_PROP_UINT32("pixo", BCM2835FBState,
443 initial_config.pixo, 1), /* 1=RGB, 0=BGR */
444 DEFINE_PROP_UINT32("alpha", BCM2835FBState,
445 initial_config.alpha, 2), /* alpha ignored */
446 DEFINE_PROP_END_OF_LIST()
449 static void bcm2835_fb_class_init(ObjectClass *klass, void *data)
451 DeviceClass *dc = DEVICE_CLASS(klass);
453 dc->props = bcm2835_fb_props;
454 dc->realize = bcm2835_fb_realize;
455 dc->reset = bcm2835_fb_reset;
456 dc->vmsd = &vmstate_bcm2835_fb;
459 static TypeInfo bcm2835_fb_info = {
460 .name = TYPE_BCM2835_FB,
461 .parent = TYPE_SYS_BUS_DEVICE,
462 .instance_size = sizeof(BCM2835FBState),
463 .class_init = bcm2835_fb_class_init,
464 .instance_init = bcm2835_fb_init,
467 static void bcm2835_fb_register_types(void)
469 type_register_static(&bcm2835_fb_info);
472 type_init(bcm2835_fb_register_types)