| /* |
| * 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 = (const 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) |