aboutsummaryrefslogtreecommitdiff
path: root/hw/display/bcm2835_fb.c
blob: 3d99d99e2b355f6cf1a5b288e94733b51e312904 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
/*
 * 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 "hw/irq.h"
#include "framebuffer.h"
#include "ui/pixel_ops.h"
#include "hw/misc/bcm2835_mbox_defs.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 | (value & 0xc0000000);
    newconf.base += BCM2835_FB_OFFSET;

    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);
    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;
    }

    /* 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, 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, 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);

    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)