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1 /*
2 * Raspberry Pi emulation (c) 2012 Gregory Estrade
3 * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
4 *
5 * Heavily based on milkymist-vgafb.c, copyright terms below:
6 * QEMU model of the Milkymist VGA framebuffer.
7 *
8 * Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
22 *
23 */
24
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
27 #include "hw/display/bcm2835_fb.h"
28 #include "hw/core/hw-error.h"
29 #include "hw/core/irq.h"
30 #include "ui/console.h"
31 #include "framebuffer.h"
32 #include "ui/pixel_ops.h"
33 #include "hw/misc/bcm2835_mbox_defs.h"
34 #include "hw/core/qdev-properties.h"
35 #include "migration/vmstate.h"
36 #include "qemu/log.h"
37 #include "qemu/module.h"
38
39 #define DEFAULT_VCRAM_SIZE 0x4000000
40 #define BCM2835_FB_OFFSET 0x00100000
41
42 /* Maximum permitted framebuffer size; experimentally determined on an rpi2 */
43 #define XRES_MAX 3840
44 #define YRES_MAX 2560
45 /* Framebuffer size used if guest requests zero size */
46 #define XRES_SMALL 592
47 #define YRES_SMALL 488
48
49 static void fb_invalidate_display(void *opaque)
50 {
51 BCM2835FBState *s = BCM2835_FB(opaque);
52
53 s->invalidate = true;
54 }
55
56 static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src,
57 int width, int deststep)
58 {
59 BCM2835FBState *s = opaque;
60 uint16_t rgb565;
61 uint32_t rgb888;
62 uint8_t r, g, b;
63 DisplaySurface *surface = qemu_console_surface(s->con);
64 int bpp = surface_bits_per_pixel(surface);
65
66 while (width--) {
67 switch (s->config.bpp) {
68 case 8:
69 /* lookup palette starting at video ram base
70 * TODO: cache translation, rather than doing this each time!
71 */
72 rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2));
73 r = (rgb888 >> 0) & 0xff;
74 g = (rgb888 >> 8) & 0xff;
75 b = (rgb888 >> 16) & 0xff;
76 src++;
77 break;
78 case 16:
79 rgb565 = lduw_le_p(src);
80 r = ((rgb565 >> 11) & 0x1f) << 3;
81 g = ((rgb565 >> 5) & 0x3f) << 2;
82 b = ((rgb565 >> 0) & 0x1f) << 3;
83 src += 2;
84 break;
85 case 24:
86 rgb888 = ldl_le_p(src);
87 r = (rgb888 >> 0) & 0xff;
88 g = (rgb888 >> 8) & 0xff;
89 b = (rgb888 >> 16) & 0xff;
90 src += 3;
91 break;
92 case 32:
93 rgb888 = ldl_le_p(src);
94 r = (rgb888 >> 0) & 0xff;
95 g = (rgb888 >> 8) & 0xff;
96 b = (rgb888 >> 16) & 0xff;
97 src += 4;
98 break;
99 default:
100 r = 0;
101 g = 0;
102 b = 0;
103 break;
104 }
105
106 if (s->config.pixo == 0) {
107 /* swap to BGR pixel format */
108 uint8_t tmp = r;
109 r = b;
110 b = tmp;
111 }
112
113 switch (bpp) {
114 case 8:
115 *dst++ = rgb_to_pixel8(r, g, b);
116 break;
117 case 15:
118 *(uint16_t *)dst = rgb_to_pixel15(r, g, b);
119 dst += 2;
120 break;
121 case 16:
122 *(uint16_t *)dst = rgb_to_pixel16(r, g, b);
123 dst += 2;
124 break;
125 case 24:
126 rgb888 = rgb_to_pixel24(r, g, b);
127 *dst++ = rgb888 & 0xff;
128 *dst++ = (rgb888 >> 8) & 0xff;
129 *dst++ = (rgb888 >> 16) & 0xff;
130 break;
131 case 32:
132 *(uint32_t *)dst = rgb_to_pixel32(r, g, b);
133 dst += 4;
134 break;
135 default:
136 return;
137 }
138 }
139 }
140
141 static bool fb_use_offsets(BCM2835FBConfig *config)
142 {
143 /*
144 * Return true if we should use the viewport offsets.
145 * Experimentally, the hardware seems to do this only if the
146 * viewport size is larger than the physical screen. (It doesn't
147 * prevent the guest setting this silly viewport setting, though...)
148 */
149 return config->xres_virtual > config->xres ||
150 config->yres_virtual > config->yres;
151 }
152
153 static bool fb_update_display(void *opaque)
154 {
155 BCM2835FBState *s = opaque;
156 DisplaySurface *surface = qemu_console_surface(s->con);
157 int first = 0;
158 int last = 0;
159 int src_width = 0;
160 int dest_width = 0;
161 uint32_t xoff = 0, yoff = 0;
162
163 if (s->lock || !s->config.xres) {
164 return true;
165 }
166
167 src_width = bcm2835_fb_get_pitch(&s->config);
168 if (fb_use_offsets(&s->config)) {
169 xoff = s->config.xoffset;
170 yoff = s->config.yoffset;
171 }
172
173 dest_width = s->config.xres;
174
175 switch (surface_bits_per_pixel(surface)) {
176 case 0:
177 return true;
178 case 8:
179 break;
180 case 15:
181 dest_width *= 2;
182 break;
183 case 16:
184 dest_width *= 2;
185 break;
186 case 24:
187 dest_width *= 3;
188 break;
189 case 32:
190 dest_width *= 4;
191 break;
192 default:
193 hw_error("bcm2835_fb: bad color depth\n");
194 break;
195 }
196
197 if (s->invalidate) {
198 hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width;
199 framebuffer_update_memory_section(&s->fbsection, s->dma_mr,
200 base,
201 s->config.yres, src_width);
202 }
203
204 framebuffer_update_display(surface, &s->fbsection,
205 s->config.xres, s->config.yres,
206 src_width, dest_width, 0, s->invalidate,
207 draw_line_src16, s, &first, &last);
208
209 if (first >= 0) {
210 qemu_console_update(s->con, 0, first, s->config.xres, last - first + 1);
211 }
212
213 s->invalidate = false;
214 return true;
215 }
216
217 void bcm2835_fb_validate_config(BCM2835FBConfig *config)
218 {
219 /*
220 * Validate the config, and clip any bogus values into range,
221 * as the hardware does. Note that fb_update_display() relies on
222 * this happening to prevent it from performing out-of-range
223 * accesses on redraw.
224 */
225 config->xres = MIN(config->xres, XRES_MAX);
226 config->xres_virtual = MIN(config->xres_virtual, XRES_MAX);
227 config->yres = MIN(config->yres, YRES_MAX);
228 config->yres_virtual = MIN(config->yres_virtual, YRES_MAX);
229
230 /*
231 * These are not minima: a 40x40 framebuffer will be accepted.
232 * They're only used as defaults if the guest asks for zero size.
233 */
234 if (config->xres == 0) {
235 config->xres = XRES_SMALL;
236 }
237 if (config->yres == 0) {
238 config->yres = YRES_SMALL;
239 }
240 if (config->xres_virtual == 0) {
241 config->xres_virtual = config->xres;
242 }
243 if (config->yres_virtual == 0) {
244 config->yres_virtual = config->yres;
245 }
246
247 if (fb_use_offsets(config)) {
248 /* Clip the offsets so the viewport is within the physical screen */
249 config->xoffset = MIN(config->xoffset,
250 config->xres_virtual - config->xres);
251 config->yoffset = MIN(config->yoffset,
252 config->yres_virtual - config->yres);
253 }
254 }
255
256 void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig)
257 {
258 s->lock = true;
259
260 s->config = *newconfig;
261
262 s->invalidate = true;
263 qemu_console_resize(s->con, s->config.xres, s->config.yres);
264 s->lock = false;
265 }
266
267 static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value)
268 {
269 uint32_t pitch;
270 uint32_t size;
271 BCM2835FBConfig newconf;
272
273 value &= ~0xf;
274
275 newconf.xres = ldl_le_phys(&s->dma_as, value);
276 newconf.yres = ldl_le_phys(&s->dma_as, value + 4);
277 newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8);
278 newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12);
279 newconf.bpp = ldl_le_phys(&s->dma_as, value + 20);
280 newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24);
281 newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28);
282
283 newconf.base = s->vcram_base + BCM2835_FB_OFFSET;
284
285 /* Copy fields which we don't want to change from the existing config */
286 newconf.pixo = s->config.pixo;
287 newconf.alpha = s->config.alpha;
288
289 bcm2835_fb_validate_config(&newconf);
290
291 pitch = bcm2835_fb_get_pitch(&newconf);
292 size = bcm2835_fb_get_size(&newconf);
293
294 stl_le_phys(&s->dma_as, value + 16, pitch);
295 stl_le_phys(&s->dma_as, value + 32, newconf.base);
296 stl_le_phys(&s->dma_as, value + 36, size);
297
298 bcm2835_fb_reconfigure(s, &newconf);
299 }
300
301 static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size)
302 {
303 BCM2835FBState *s = opaque;
304 uint32_t res = 0;
305
306 switch (offset) {
307 case MBOX_AS_DATA:
308 res = MBOX_CHAN_FB;
309 s->pending = false;
310 qemu_set_irq(s->mbox_irq, 0);
311 break;
312
313 case MBOX_AS_PENDING:
314 res = s->pending;
315 break;
316
317 default:
318 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
319 __func__, offset);
320 return 0;
321 }
322
323 return res;
324 }
325
326 static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value,
327 unsigned size)
328 {
329 BCM2835FBState *s = opaque;
330
331 switch (offset) {
332 case MBOX_AS_DATA:
333 /* bcm2835_mbox should check our pending status before pushing */
334 assert(!s->pending);
335 s->pending = true;
336 bcm2835_fb_mbox_push(s, value);
337 qemu_set_irq(s->mbox_irq, 1);
338 break;
339
340 default:
341 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
342 __func__, offset);
343 return;
344 }
345 }
346
347 static const MemoryRegionOps bcm2835_fb_ops = {
348 .read = bcm2835_fb_read,
349 .write = bcm2835_fb_write,
350 .endianness = DEVICE_NATIVE_ENDIAN,
351 .valid.min_access_size = 4,
352 .valid.max_access_size = 4,
353 };
354
355 static const VMStateDescription vmstate_bcm2835_fb = {
356 .name = TYPE_BCM2835_FB,
357 .version_id = 1,
358 .minimum_version_id = 1,
359 .fields = (const VMStateField[]) {
360 VMSTATE_BOOL(lock, BCM2835FBState),
361 VMSTATE_BOOL(invalidate, BCM2835FBState),
362 VMSTATE_BOOL(pending, BCM2835FBState),
363 VMSTATE_UINT32(config.xres, BCM2835FBState),
364 VMSTATE_UINT32(config.yres, BCM2835FBState),
365 VMSTATE_UINT32(config.xres_virtual, BCM2835FBState),
366 VMSTATE_UINT32(config.yres_virtual, BCM2835FBState),
367 VMSTATE_UINT32(config.xoffset, BCM2835FBState),
368 VMSTATE_UINT32(config.yoffset, BCM2835FBState),
369 VMSTATE_UINT32(config.bpp, BCM2835FBState),
370 VMSTATE_UINT32(config.base, BCM2835FBState),
371 VMSTATE_UNUSED(8), /* Was pitch and size */
372 VMSTATE_UINT32(config.pixo, BCM2835FBState),
373 VMSTATE_UINT32(config.alpha, BCM2835FBState),
374 VMSTATE_END_OF_LIST()
375 }
376 };
377
378 static const GraphicHwOps vgafb_ops = {
379 .invalidate = fb_invalidate_display,
380 .gfx_update = fb_update_display,
381 };
382
383 static void bcm2835_fb_init(Object *obj)
384 {
385 BCM2835FBState *s = BCM2835_FB(obj);
386
387 memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB,
388 0x10);
389 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
390 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
391 }
392
393 static void bcm2835_fb_reset(DeviceState *dev)
394 {
395 BCM2835FBState *s = BCM2835_FB(dev);
396
397 s->pending = false;
398
399 s->config = s->initial_config;
400
401 s->invalidate = true;
402 s->lock = false;
403 }
404
405 static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
406 {
407 BCM2835FBState *s = BCM2835_FB(dev);
408 Object *obj;
409
410 if (s->vcram_base == 0) {
411 error_setg(errp, "%s: required vcram-base property not set", __func__);
412 return;
413 }
414
415 obj = object_property_get_link(OBJECT(dev), "dma-mr", &error_abort);
416
417 /* Fill in the parts of initial_config that are not set by QOM properties */
418 s->initial_config.xres_virtual = s->initial_config.xres;
419 s->initial_config.yres_virtual = s->initial_config.yres;
420 s->initial_config.xoffset = 0;
421 s->initial_config.yoffset = 0;
422 s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET;
423
424 s->dma_mr = MEMORY_REGION(obj);
425 address_space_init(&s->dma_as, s->dma_mr, TYPE_BCM2835_FB "-memory");
426
427 bcm2835_fb_reset(dev);
428
429 s->con = qemu_graphic_console_create(dev, 0, &vgafb_ops, s);
430 qemu_console_resize(s->con, s->config.xres, s->config.yres);
431 }
432
433 static const Property bcm2835_fb_props[] = {
434 DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/
435 DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size,
436 DEFAULT_VCRAM_SIZE),
437 DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640),
438 DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480),
439 DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16),
440 DEFINE_PROP_UINT32("pixo", BCM2835FBState,
441 initial_config.pixo, 1), /* 1=RGB, 0=BGR */
442 DEFINE_PROP_UINT32("alpha", BCM2835FBState,
443 initial_config.alpha, 2), /* alpha ignored */
444 };
445
446 static void bcm2835_fb_class_init(ObjectClass *klass, const void *data)
447 {
448 DeviceClass *dc = DEVICE_CLASS(klass);
449
450 device_class_set_props(dc, bcm2835_fb_props);
451 dc->realize = bcm2835_fb_realize;
452 device_class_set_legacy_reset(dc, bcm2835_fb_reset);
453 dc->vmsd = &vmstate_bcm2835_fb;
454 }
455
456 static const TypeInfo bcm2835_fb_info = {
457 .name = TYPE_BCM2835_FB,
458 .parent = TYPE_SYS_BUS_DEVICE,
459 .instance_size = sizeof(BCM2835FBState),
460 .class_init = bcm2835_fb_class_init,
461 .instance_init = bcm2835_fb_init,
462 };
463
464 static void bcm2835_fb_register_types(void)
465 {
466 type_register_static(&bcm2835_fb_info);
467 }
468
469 type_init(bcm2835_fb_register_types)