x86: qemu: Add graphics support
It turns out that QEMU x86 emulated graphic card has a built-in
option ROM which can be run perfectly with native mode by U-Boot.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/qemu/pci.c b/arch/x86/cpu/qemu/pci.c
index d50ab75..ac9c056 100644
--- a/arch/x86/cpu/qemu/pci.c
+++ b/arch/x86/cpu/qemu/pci.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <pci.h>
+#include <pci_rom.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -45,5 +46,26 @@
int board_pci_post_scan(struct pci_controller *hose)
{
- return 0;
+ int ret = 0;
+ ulong start;
+ pci_dev_t bdf;
+ struct pci_device_id graphic_card[] = { { 0x1234, 0x1111 } };
+
+ /*
+ * QEMU emulated graphic card shows in the PCI configuration space with
+ * PCI vendor id and device id as an artificial pair 0x1234:0x1111.
+ * It is on PCI bus 0, function 0, but device number is not consistent
+ * for the two x86 targets it supports. For i440FX and PIIX chipset
+ * board, it shows as device 2, while for Q35 and ICH9 chipset board,
+ * it shows as device 1. Here we locate its bdf at run-time based on
+ * its vendor id and device id pair so we can support both boards.
+ */
+ bdf = pci_find_devices(graphic_card, 0);
+ if (bdf != -1) {
+ start = get_timer(0);
+ ret = pci_run_vga_bios(bdf, NULL, PCI_ROM_USE_NATIVE);
+ debug("BIOS ran in %lums\n", get_timer(start));
+ }
+
+ return ret;
}