470 lines
14 KiB
C
470 lines
14 KiB
C
/*
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* Raspberry Pi emulation (c) 2012 Gregory Estrade
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* Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
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*
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* Heavily based on milkymist-vgafb.c, copyright terms below:
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* QEMU model of the Milkymist VGA framebuffer.
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*
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* Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/display/bcm2835_fb.h"
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#include "hw/hw.h"
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#include "hw/irq.h"
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#include "framebuffer.h"
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#include "ui/pixel_ops.h"
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#include "hw/misc/bcm2835_mbox_defs.h"
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#include "hw/qdev-properties.h"
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#include "migration/vmstate.h"
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#include "qemu/log.h"
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#include "qemu/module.h"
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#define DEFAULT_VCRAM_SIZE 0x4000000
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#define BCM2835_FB_OFFSET 0x00100000
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/* Maximum permitted framebuffer size; experimentally determined on an rpi2 */
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#define XRES_MAX 3840
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#define YRES_MAX 2560
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/* Framebuffer size used if guest requests zero size */
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#define XRES_SMALL 592
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#define YRES_SMALL 488
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static void fb_invalidate_display(void *opaque)
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{
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BCM2835FBState *s = BCM2835_FB(opaque);
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s->invalidate = true;
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}
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static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src,
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int width, int deststep)
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{
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BCM2835FBState *s = opaque;
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uint16_t rgb565;
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uint32_t rgb888;
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uint8_t r, g, b;
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DisplaySurface *surface = qemu_console_surface(s->con);
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int bpp = surface_bits_per_pixel(surface);
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while (width--) {
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switch (s->config.bpp) {
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case 8:
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/* lookup palette starting at video ram base
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* TODO: cache translation, rather than doing this each time!
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*/
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rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2));
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r = (rgb888 >> 0) & 0xff;
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g = (rgb888 >> 8) & 0xff;
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b = (rgb888 >> 16) & 0xff;
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src++;
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break;
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case 16:
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rgb565 = lduw_le_p(src);
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r = ((rgb565 >> 11) & 0x1f) << 3;
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g = ((rgb565 >> 5) & 0x3f) << 2;
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b = ((rgb565 >> 0) & 0x1f) << 3;
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src += 2;
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break;
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case 24:
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rgb888 = ldl_le_p(src);
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r = (rgb888 >> 0) & 0xff;
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g = (rgb888 >> 8) & 0xff;
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b = (rgb888 >> 16) & 0xff;
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src += 3;
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break;
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case 32:
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rgb888 = ldl_le_p(src);
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r = (rgb888 >> 0) & 0xff;
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g = (rgb888 >> 8) & 0xff;
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b = (rgb888 >> 16) & 0xff;
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src += 4;
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break;
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default:
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r = 0;
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g = 0;
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b = 0;
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break;
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}
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if (s->config.pixo == 0) {
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/* swap to BGR pixel format */
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uint8_t tmp = r;
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r = b;
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b = tmp;
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}
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switch (bpp) {
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case 8:
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*dst++ = rgb_to_pixel8(r, g, b);
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break;
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case 15:
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*(uint16_t *)dst = rgb_to_pixel15(r, g, b);
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dst += 2;
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break;
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case 16:
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*(uint16_t *)dst = rgb_to_pixel16(r, g, b);
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dst += 2;
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break;
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case 24:
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rgb888 = rgb_to_pixel24(r, g, b);
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*dst++ = rgb888 & 0xff;
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*dst++ = (rgb888 >> 8) & 0xff;
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*dst++ = (rgb888 >> 16) & 0xff;
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break;
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case 32:
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*(uint32_t *)dst = rgb_to_pixel32(r, g, b);
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dst += 4;
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break;
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default:
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return;
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}
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}
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}
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static bool fb_use_offsets(BCM2835FBConfig *config)
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{
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/*
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* Return true if we should use the viewport offsets.
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* Experimentally, the hardware seems to do this only if the
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* viewport size is larger than the physical screen. (It doesn't
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* prevent the guest setting this silly viewport setting, though...)
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*/
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return config->xres_virtual > config->xres &&
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config->yres_virtual > config->yres;
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}
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static void fb_update_display(void *opaque)
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{
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BCM2835FBState *s = opaque;
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DisplaySurface *surface = qemu_console_surface(s->con);
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int first = 0;
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int last = 0;
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int src_width = 0;
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int dest_width = 0;
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uint32_t xoff = 0, yoff = 0;
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if (s->lock || !s->config.xres) {
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return;
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}
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src_width = bcm2835_fb_get_pitch(&s->config);
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if (fb_use_offsets(&s->config)) {
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xoff = s->config.xoffset;
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yoff = s->config.yoffset;
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}
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dest_width = s->config.xres;
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switch (surface_bits_per_pixel(surface)) {
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case 0:
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return;
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case 8:
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break;
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case 15:
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dest_width *= 2;
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break;
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case 16:
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dest_width *= 2;
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break;
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case 24:
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dest_width *= 3;
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break;
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case 32:
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dest_width *= 4;
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break;
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default:
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hw_error("bcm2835_fb: bad color depth\n");
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break;
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}
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if (s->invalidate) {
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hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width;
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framebuffer_update_memory_section(&s->fbsection, s->dma_mr,
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base,
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s->config.yres, src_width);
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}
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framebuffer_update_display(surface, &s->fbsection,
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s->config.xres, s->config.yres,
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src_width, dest_width, 0, s->invalidate,
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draw_line_src16, s, &first, &last);
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if (first >= 0) {
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dpy_gfx_update(s->con, 0, first, s->config.xres,
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last - first + 1);
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}
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s->invalidate = false;
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}
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void bcm2835_fb_validate_config(BCM2835FBConfig *config)
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{
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/*
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* Validate the config, and clip any bogus values into range,
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* as the hardware does. Note that fb_update_display() relies on
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* this happening to prevent it from performing out-of-range
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* accesses on redraw.
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*/
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config->xres = MIN(config->xres, XRES_MAX);
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config->xres_virtual = MIN(config->xres_virtual, XRES_MAX);
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config->yres = MIN(config->yres, YRES_MAX);
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config->yres_virtual = MIN(config->yres_virtual, YRES_MAX);
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/*
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* These are not minima: a 40x40 framebuffer will be accepted.
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* They're only used as defaults if the guest asks for zero size.
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*/
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if (config->xres == 0) {
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config->xres = XRES_SMALL;
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}
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if (config->yres == 0) {
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config->yres = YRES_SMALL;
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}
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if (config->xres_virtual == 0) {
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config->xres_virtual = config->xres;
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}
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if (config->yres_virtual == 0) {
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config->yres_virtual = config->yres;
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}
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if (fb_use_offsets(config)) {
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/* Clip the offsets so the viewport is within the physical screen */
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config->xoffset = MIN(config->xoffset,
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config->xres_virtual - config->xres);
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config->yoffset = MIN(config->yoffset,
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config->yres_virtual - config->yres);
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}
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}
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void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig)
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{
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s->lock = true;
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s->config = *newconfig;
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s->invalidate = true;
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qemu_console_resize(s->con, s->config.xres, s->config.yres);
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s->lock = false;
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}
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static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value)
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{
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uint32_t pitch;
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uint32_t size;
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BCM2835FBConfig newconf;
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value &= ~0xf;
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newconf.xres = ldl_le_phys(&s->dma_as, value);
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newconf.yres = ldl_le_phys(&s->dma_as, value + 4);
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newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8);
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newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12);
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newconf.bpp = ldl_le_phys(&s->dma_as, value + 20);
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newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24);
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newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28);
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newconf.base = s->vcram_base | (value & 0xc0000000);
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newconf.base += BCM2835_FB_OFFSET;
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/* Copy fields which we don't want to change from the existing config */
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newconf.pixo = s->config.pixo;
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newconf.alpha = s->config.alpha;
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bcm2835_fb_validate_config(&newconf);
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pitch = bcm2835_fb_get_pitch(&newconf);
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size = bcm2835_fb_get_size(&newconf);
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stl_le_phys(&s->dma_as, value + 16, pitch);
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stl_le_phys(&s->dma_as, value + 32, newconf.base);
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stl_le_phys(&s->dma_as, value + 36, size);
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bcm2835_fb_reconfigure(s, &newconf);
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}
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static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size)
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{
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BCM2835FBState *s = opaque;
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uint32_t res = 0;
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switch (offset) {
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case MBOX_AS_DATA:
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res = MBOX_CHAN_FB;
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s->pending = false;
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qemu_set_irq(s->mbox_irq, 0);
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break;
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case MBOX_AS_PENDING:
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res = s->pending;
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
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__func__, offset);
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return 0;
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}
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return res;
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}
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static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value,
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unsigned size)
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{
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BCM2835FBState *s = opaque;
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switch (offset) {
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case MBOX_AS_DATA:
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/* bcm2835_mbox should check our pending status before pushing */
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assert(!s->pending);
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s->pending = true;
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bcm2835_fb_mbox_push(s, value);
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qemu_set_irq(s->mbox_irq, 1);
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
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__func__, offset);
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return;
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}
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}
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static const MemoryRegionOps bcm2835_fb_ops = {
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.read = bcm2835_fb_read,
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.write = bcm2835_fb_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.valid.min_access_size = 4,
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.valid.max_access_size = 4,
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};
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static const VMStateDescription vmstate_bcm2835_fb = {
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.name = TYPE_BCM2835_FB,
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(lock, BCM2835FBState),
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VMSTATE_BOOL(invalidate, BCM2835FBState),
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VMSTATE_BOOL(pending, BCM2835FBState),
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VMSTATE_UINT32(config.xres, BCM2835FBState),
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VMSTATE_UINT32(config.yres, BCM2835FBState),
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VMSTATE_UINT32(config.xres_virtual, BCM2835FBState),
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VMSTATE_UINT32(config.yres_virtual, BCM2835FBState),
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VMSTATE_UINT32(config.xoffset, BCM2835FBState),
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VMSTATE_UINT32(config.yoffset, BCM2835FBState),
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VMSTATE_UINT32(config.bpp, BCM2835FBState),
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VMSTATE_UINT32(config.base, BCM2835FBState),
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VMSTATE_UNUSED(8), /* Was pitch and size */
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VMSTATE_UINT32(config.pixo, BCM2835FBState),
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VMSTATE_UINT32(config.alpha, BCM2835FBState),
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VMSTATE_END_OF_LIST()
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}
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};
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static const GraphicHwOps vgafb_ops = {
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.invalidate = fb_invalidate_display,
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.gfx_update = fb_update_display,
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};
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static void bcm2835_fb_init(Object *obj)
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{
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BCM2835FBState *s = BCM2835_FB(obj);
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memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB,
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0x10);
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sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
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sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
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}
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static void bcm2835_fb_reset(DeviceState *dev)
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{
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BCM2835FBState *s = BCM2835_FB(dev);
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s->pending = false;
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s->config = s->initial_config;
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s->invalidate = true;
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s->lock = false;
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}
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static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
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{
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BCM2835FBState *s = BCM2835_FB(dev);
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Object *obj;
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if (s->vcram_base == 0) {
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error_setg(errp, "%s: required vcram-base property not set", __func__);
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return;
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}
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obj = object_property_get_link(OBJECT(dev), "dma-mr", &error_abort);
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/* Fill in the parts of initial_config that are not set by QOM properties */
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s->initial_config.xres_virtual = s->initial_config.xres;
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s->initial_config.yres_virtual = s->initial_config.yres;
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s->initial_config.xoffset = 0;
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s->initial_config.yoffset = 0;
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s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET;
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s->dma_mr = MEMORY_REGION(obj);
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address_space_init(&s->dma_as, s->dma_mr, TYPE_BCM2835_FB "-memory");
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bcm2835_fb_reset(dev);
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s->con = graphic_console_init(dev, 0, &vgafb_ops, s);
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qemu_console_resize(s->con, s->config.xres, s->config.yres);
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}
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static Property bcm2835_fb_props[] = {
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DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/
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DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size,
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DEFAULT_VCRAM_SIZE),
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DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640),
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DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480),
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DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16),
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DEFINE_PROP_UINT32("pixo", BCM2835FBState,
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initial_config.pixo, 1), /* 1=RGB, 0=BGR */
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DEFINE_PROP_UINT32("alpha", BCM2835FBState,
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initial_config.alpha, 2), /* alpha ignored */
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DEFINE_PROP_END_OF_LIST()
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};
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static void bcm2835_fb_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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device_class_set_props(dc, bcm2835_fb_props);
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dc->realize = bcm2835_fb_realize;
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dc->reset = bcm2835_fb_reset;
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dc->vmsd = &vmstate_bcm2835_fb;
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}
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static TypeInfo bcm2835_fb_info = {
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.name = TYPE_BCM2835_FB,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(BCM2835FBState),
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.class_init = bcm2835_fb_class_init,
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.instance_init = bcm2835_fb_init,
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};
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static void bcm2835_fb_register_types(void)
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{
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type_register_static(&bcm2835_fb_info);
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}
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type_init(bcm2835_fb_register_types)
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