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https://github.com/xemu-project/xemu.git
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lm32: add Milkymist VGAFB support
This patch adds support for Milkymist's VGA framebuffer. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Michael Walle
Edgar E. Iglesias
parent
883de16b46
commit
d23948b15a
@ -276,6 +276,8 @@ obj-lm32-y += milkymist-softusb.o
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obj-lm32-y += milkymist-sysctl.o
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obj-lm32-$(CONFIG_OPENGL) += milkymist-tmu2.o
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obj-lm32-y += milkymist-uart.o
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obj-lm32-y += milkymist-vgafb.o
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obj-lm32-y += framebuffer.o
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obj-mips-y = mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
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obj-mips-y += mips_addr.o mips_timer.o mips_int.o
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318
hw/milkymist-vgafb.c
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318
hw/milkymist-vgafb.c
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@ -0,0 +1,318 @@
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/*
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* QEMU model of the Milkymist VGA framebuffer.
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*
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* Copyright (c) 2010 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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* Specification available at:
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* http://www.milkymist.org/socdoc/vgafb.pdf
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*/
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#include "hw.h"
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#include "sysbus.h"
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#include "trace.h"
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#include "console.h"
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#include "framebuffer.h"
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#include "pixel_ops.h"
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#include "qemu-error.h"
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#define BITS 8
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#include "milkymist-vgafb_template.h"
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#define BITS 15
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#include "milkymist-vgafb_template.h"
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#define BITS 16
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#include "milkymist-vgafb_template.h"
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#define BITS 24
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#include "milkymist-vgafb_template.h"
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#define BITS 32
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#include "milkymist-vgafb_template.h"
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enum {
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R_CTRL = 0,
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R_HRES,
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R_HSYNC_START,
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R_HSYNC_END,
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R_HSCAN,
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R_VRES,
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R_VSYNC_START,
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R_VSYNC_END,
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R_VSCAN,
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R_BASEADDRESS,
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R_BASEADDRESS_ACT,
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R_BURST_COUNT,
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R_SOURCE_CLOCK,
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R_MAX
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};
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enum {
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CTRL_RESET = (1<<0),
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};
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struct MilkymistVgafbState {
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SysBusDevice busdev;
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DisplayState *ds;
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int invalidate;
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uint32_t fb_offset;
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uint32_t fb_mask;
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uint32_t regs[R_MAX];
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};
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typedef struct MilkymistVgafbState MilkymistVgafbState;
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static int vgafb_enabled(MilkymistVgafbState *s)
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{
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return !(s->regs[R_CTRL] & CTRL_RESET);
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}
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static void vgafb_update_display(void *opaque)
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{
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MilkymistVgafbState *s = opaque;
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int first = 0;
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int last = 0;
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drawfn fn;
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if (!vgafb_enabled(s)) {
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return;
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}
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int dest_width = s->regs[R_HRES];
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switch (ds_get_bits_per_pixel(s->ds)) {
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case 0:
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return;
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case 8:
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fn = draw_line_8;
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break;
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case 15:
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fn = draw_line_15;
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dest_width *= 2;
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break;
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case 16:
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fn = draw_line_16;
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dest_width *= 2;
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break;
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case 24:
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fn = draw_line_24;
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dest_width *= 3;
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break;
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case 32:
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fn = draw_line_32;
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dest_width *= 4;
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break;
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default:
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hw_error("milkymist_vgafb: bad color depth\n");
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break;
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}
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framebuffer_update_display(s->ds,
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s->regs[R_BASEADDRESS] + s->fb_offset,
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s->regs[R_HRES],
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s->regs[R_VRES],
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s->regs[R_HRES] * 2,
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dest_width,
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0,
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s->invalidate,
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fn,
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NULL,
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&first, &last);
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if (first >= 0) {
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dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1);
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}
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s->invalidate = 0;
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}
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static void vgafb_invalidate_display(void *opaque)
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{
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MilkymistVgafbState *s = opaque;
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s->invalidate = 1;
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}
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static void vgafb_resize(MilkymistVgafbState *s)
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{
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if (!vgafb_enabled(s)) {
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return;
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}
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qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]);
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s->invalidate = 1;
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}
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static uint32_t vgafb_read(void *opaque, target_phys_addr_t addr)
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{
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MilkymistVgafbState *s = opaque;
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uint32_t r = 0;
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addr >>= 2;
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switch (addr) {
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case R_CTRL:
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case R_HRES:
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case R_HSYNC_START:
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case R_HSYNC_END:
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case R_HSCAN:
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case R_VRES:
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case R_VSYNC_START:
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case R_VSYNC_END:
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case R_VSCAN:
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case R_BASEADDRESS:
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case R_BURST_COUNT:
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case R_SOURCE_CLOCK:
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r = s->regs[addr];
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break;
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case R_BASEADDRESS_ACT:
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r = s->regs[R_BASEADDRESS];
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break;
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default:
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error_report("milkymist_vgafb: read access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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}
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trace_milkymist_vgafb_memory_read(addr << 2, r);
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return r;
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}
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static void
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vgafb_write(void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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MilkymistVgafbState *s = opaque;
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trace_milkymist_vgafb_memory_write(addr, value);
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addr >>= 2;
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switch (addr) {
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case R_CTRL:
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case R_HSYNC_START:
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case R_HSYNC_END:
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case R_HSCAN:
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case R_VSYNC_START:
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case R_VSYNC_END:
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case R_VSCAN:
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case R_BURST_COUNT:
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case R_SOURCE_CLOCK:
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s->regs[addr] = value;
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break;
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case R_BASEADDRESS:
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if (value & 0x1f) {
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error_report("milkymist_vgafb: framebuffer base address have to "
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"be 32 byte aligned");
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break;
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}
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s->regs[addr] = value & s->fb_mask;
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s->invalidate = 1;
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break;
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case R_HRES:
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case R_VRES:
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s->regs[addr] = value;
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vgafb_resize(s);
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break;
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case R_BASEADDRESS_ACT:
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error_report("milkymist_vgafb: write to read-only register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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default:
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error_report("milkymist_vgafb: write access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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}
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}
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static CPUReadMemoryFunc * const vgafb_read_fn[] = {
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NULL,
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NULL,
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&vgafb_read
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};
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static CPUWriteMemoryFunc * const vgafb_write_fn[] = {
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NULL,
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NULL,
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&vgafb_write
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};
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static void milkymist_vgafb_reset(DeviceState *d)
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{
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MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev);
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int i;
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for (i = 0; i < R_MAX; i++) {
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s->regs[i] = 0;
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}
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/* defaults */
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s->regs[R_CTRL] = CTRL_RESET;
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s->regs[R_HRES] = 640;
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s->regs[R_VRES] = 480;
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s->regs[R_BASEADDRESS] = 0;
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}
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static int milkymist_vgafb_init(SysBusDevice *dev)
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{
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MilkymistVgafbState *s = FROM_SYSBUS(typeof(*s), dev);
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int vgafb_regs;
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vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s,
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DEVICE_NATIVE_ENDIAN);
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sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);
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s->ds = graphic_console_init(vgafb_update_display,
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vgafb_invalidate_display,
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NULL, NULL, s);
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return 0;
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}
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static int vgafb_post_load(void *opaque, int version_id)
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{
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vgafb_invalidate_display(opaque);
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return 0;
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}
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static const VMStateDescription vmstate_milkymist_vgafb = {
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.name = "milkymist-vgafb",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.post_load = vgafb_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
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VMSTATE_END_OF_LIST()
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}
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};
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static SysBusDeviceInfo milkymist_vgafb_info = {
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.init = milkymist_vgafb_init,
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.qdev.name = "milkymist-vgafb",
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.qdev.size = sizeof(MilkymistVgafbState),
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.qdev.vmsd = &vmstate_milkymist_vgafb,
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.qdev.reset = milkymist_vgafb_reset,
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.qdev.props = (Property[]) {
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DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
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DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
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DEFINE_PROP_END_OF_LIST(),
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}
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};
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static void milkymist_vgafb_register(void)
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{
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sysbus_register_withprop(&milkymist_vgafb_info);
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}
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device_init(milkymist_vgafb_register)
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74
hw/milkymist-vgafb_template.h
Normal file
74
hw/milkymist-vgafb_template.h
Normal file
@ -0,0 +1,74 @@
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/*
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* QEMU model of the Milkymist VGA framebuffer.
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*
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* Copyright (c) 2010 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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#if BITS == 8
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#define COPY_PIXEL(to, r, g, b) \
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do { \
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*to = rgb_to_pixel8(r, g, b); \
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to += 1; \
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} while (0)
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#elif BITS == 15
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#define COPY_PIXEL(to, r, g, b) \
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do { \
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*(uint16_t *)to = rgb_to_pixel15(r, g, b); \
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to += 2; \
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} while (0)
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#elif BITS == 16
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#define COPY_PIXEL(to, r, g, b) \
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do { \
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*(uint16_t *)to = rgb_to_pixel16(r, g, b); \
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to += 2; \
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} while (0)
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#elif BITS == 24
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#define COPY_PIXEL(to, r, g, b) \
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do { \
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uint32 tmp = rgb_to_pixel24(r, g, b); \
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*(to++) = tmp & 0xff; \
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*(to++) = (tmp >> 8) & 0xff; \
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*(to++) = (tmp >> 16) & 0xff; \
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} while (0)
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#elif BITS == 32
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#define COPY_PIXEL(to, r, g, b) \
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do { \
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*(uint32_t *)to = rgb_to_pixel32(r, g, b); \
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to += 4; \
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} while (0)
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#else
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#error unknown bit depth
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#endif
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static void glue(draw_line_, BITS)(void *opaque, uint8_t *d, const uint8_t *s,
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int width, int deststep)
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{
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uint16_t rgb565;
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uint8_t r, g, b;
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while (width--) {
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rgb565 = lduw_raw(s);
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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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COPY_PIXEL(d, r, g, b);
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s += 2;
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}
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}
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#undef BITS
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#undef COPY_PIXEL
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@ -355,3 +355,7 @@ disable milkymist_uart_memory_read(uint32_t addr, uint32_t value) "addr %08x val
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disable milkymist_uart_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
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disable milkymist_uart_pulse_irq_rx(void) "Pulse IRQ RX"
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disable milkymist_uart_pulse_irq_tx(void) "Pulse IRQ TX"
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# hw/milkymist-vgafb.c
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disable milkymist_vgafb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
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disable milkymist_vgafb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
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