x86: qemu: Add graphics support

[karo-tx-uboot.git] / arch / x86 / cpu / qemu / pci.c

diff --git a/arch/x86/cpu/qemu/pci.c b/arch/x86/cpu/qemu/pci.c
index d50ab752d39f3f428d377031a9b07056eb3895b2..ac9c056e2be5b9e6a941baaf3629d73ffa79bdf2 100644 (file)
--- 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 @@ void board_pci_setup_hose(struct pci_controller *hose)
 
 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;
 }