mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
e2d934b4da
Bochs is convenient with QEMU on x86 since it does not require a video BIOS. Add a driver for it. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Modified from coreboot bochs.c
|
|
*/
|
|
|
|
#define LOG_CATEGORY UCLASS_VIDEO
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <log.h>
|
|
#include <pci.h>
|
|
#include <video.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mtrr.h>
|
|
#include <linux/sizes.h>
|
|
#include "bochs.h"
|
|
|
|
static int xsize = CONFIG_VIDEO_BOCHS_SIZE_X;
|
|
static int ysize = CONFIG_VIDEO_BOCHS_SIZE_Y;
|
|
|
|
static void bochs_write(void *mmio, int index, int val)
|
|
{
|
|
writew(val, mmio + MMIO_BASE + index * 2);
|
|
}
|
|
|
|
static int bochs_read(void *mmio, int index)
|
|
{
|
|
return readw(mmio + MMIO_BASE + index * 2);
|
|
}
|
|
|
|
static void bochs_vga_write(int index, uint8_t val)
|
|
{
|
|
outb(val, VGA_INDEX);
|
|
}
|
|
|
|
static int bochs_init_fb(struct udevice *dev)
|
|
{
|
|
struct video_uc_plat *plat = dev_get_uclass_plat(dev);
|
|
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
ulong fb;
|
|
void *mmio;
|
|
int id, mem;
|
|
|
|
log_debug("probing %s at PCI %x\n", dev->name, dm_pci_get_bdf(dev));
|
|
fb = dm_pci_read_bar32(dev, 0);
|
|
if (!fb)
|
|
return log_msg_ret("fb", -EIO);
|
|
|
|
/* MMIO bar supported since qemu 3.0+ */
|
|
mmio = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_2, 0, 0, PCI_REGION_TYPE,
|
|
PCI_REGION_MEM);
|
|
|
|
if (!mmio)
|
|
return log_msg_ret("map", -EIO);
|
|
|
|
/* bochs dispi detection */
|
|
id = bochs_read(mmio, INDEX_ID);
|
|
if ((id & 0xfff0) != ID0) {
|
|
log_debug("ID mismatch\n");
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
mem = bochs_read(mmio, INDEX_VIDEO_MEMORY_64K) * SZ_64K;
|
|
log_debug("QEMU VGA: bochs @ %p: %d MiB FB at %lx\n", mmio, mem / SZ_1M,
|
|
fb);
|
|
|
|
uc_priv->xsize = xsize;
|
|
uc_priv->ysize = ysize;
|
|
uc_priv->bpix = VIDEO_BPP32;
|
|
|
|
/* setup video mode */
|
|
bochs_write(mmio, INDEX_ENABLE, 0);
|
|
bochs_write(mmio, INDEX_BANK, 0);
|
|
bochs_write(mmio, INDEX_BPP, VNBITS(uc_priv->bpix));
|
|
bochs_write(mmio, INDEX_XRES, xsize);
|
|
bochs_write(mmio, INDEX_YRES, ysize);
|
|
bochs_write(mmio, INDEX_VIRT_WIDTH, xsize);
|
|
bochs_write(mmio, INDEX_VIRT_HEIGHT, ysize);
|
|
bochs_write(mmio, INDEX_X_OFFSET, 0);
|
|
bochs_write(mmio, INDEX_Y_OFFSET, 0);
|
|
bochs_write(mmio, INDEX_ENABLE, ENABLED | LFB_ENABLED);
|
|
|
|
bochs_vga_write(0, 0x20); /* disable blanking */
|
|
|
|
plat->base = fb;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bochs_video_probe(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = bochs_init_fb(dev);
|
|
if (ret)
|
|
return log_ret(ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bochs_video_bind(struct udevice *dev)
|
|
{
|
|
struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
|
|
|
|
/* Set the maximum supported resolution */
|
|
uc_plat->size = 2560 * 1600 * 4;
|
|
log_debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(bochs_video) = {
|
|
.name = "bochs_video",
|
|
.id = UCLASS_VIDEO,
|
|
.bind = bochs_video_bind,
|
|
.probe = bochs_video_probe,
|
|
};
|
|
|
|
static struct pci_device_id bochs_video_supported[] = {
|
|
{ PCI_DEVICE(0x1234, 0x1111) },
|
|
{ },
|
|
};
|
|
|
|
U_BOOT_PCI_DEVICE(bochs_video, bochs_video_supported);
|