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/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <pci.h>
#include <malloc.h>
#include <asm/ptrace.h>
#include <asm/realmode.h>
#include <asm/io.h>
#include <asm/pci.h>
#include "bios.h"
#undef PCI_BIOS_DEBUG
#undef VGA_BIOS_DEBUG
#ifdef VGA_BIOS_DEBUG
#define PRINTF(fmt, args...) printf(fmt, ##args)
#else
#define PRINTF(fmt, args...)
#endif
#define PCI_CLASS_VIDEO 3
#define PCI_CLASS_VIDEO_STD 0
#define PCI_CLASS_VIDEO_PROG_IF_VGA 0
DEFINE_PCI_DEVICE_TABLE(supported) = {
{PCI_VIDEO_VENDOR_ID, PCI_VIDEO_DEVICE_ID},
{}
};
static u32 probe_pci_video(void)
{
struct pci_controller *hose;
pci_dev_t devbusfn = pci_find_devices(supported, 0);
if ((devbusfn != -1)) {
u32 old;
u32 addr;
/* PCI video device detected */
printf("Found PCI VGA device at %02x.%02x.%x\n",
PCI_BUS(devbusfn),
PCI_DEV(devbusfn),
PCI_FUNC(devbusfn));
/* Enable I/O decoding as well, PCI viudeo boards
* support I/O accesses, but they provide no
* bar register for this since the ports are fixed.
*/
pci_write_config_word(devbusfn,
PCI_COMMAND,
PCI_COMMAND_MEMORY |
PCI_COMMAND_IO |
PCI_COMMAND_MASTER);
/* Test the ROM decoder, do the device support a rom? */
pci_read_config_dword(devbusfn, PCI_ROM_ADDRESS, &old);
pci_write_config_dword(devbusfn, PCI_ROM_ADDRESS,
(u32)PCI_ROM_ADDRESS_MASK);
pci_read_config_dword(devbusfn, PCI_ROM_ADDRESS, &addr);
pci_write_config_dword(devbusfn, PCI_ROM_ADDRESS, old);
if (!addr) {
printf("PCI VGA have no ROM?\n");
return 0;
}
/* device have a rom */
if (pci_shadow_rom(devbusfn, (void *)0xc0000)) {
printf("Shadowing of PCI VGA BIOS failed\n");
return 0;
}
/* Now enable lagacy VGA port access */
hose = pci_bus_to_hose(PCI_BUS(devbusfn));
if (pci_enable_legacy_video_ports(hose)) {
printf("PCI VGA enable failed\n");
return 0;
}
/* return the pci device info, that we'll need later */
return PCI_BUS(devbusfn) << 8 |
PCI_DEV(devbusfn) << 3 | (PCI_FUNC(devbusfn) & 7);
}
return 0;
}
static int probe_isa_video(void)
{
u32 ptr;
char *buf;
ptr = isa_map_rom(0xc0000, 0x8000);
if (!ptr)
return -1;
buf = malloc(0x8000);
if (!buf) {
isa_unmap_rom(ptr);
return -1;
}
if (readw(ptr) != 0xaa55) {
free(buf);
isa_unmap_rom(ptr);
return -1;
}
/* shadow the rom */
memcpy(buf, (void *)ptr, 0x8000);
isa_unmap_rom(ptr);
memcpy((void *)0xc0000, buf, 0x8000);
free(buf);
return 0;
}
int video_bios_init(void)
{
struct pt_regs regs;
int size;
int i;
u8 sum;
/* clear the video bios area in case we warmbooted */
memset((void *)0xc0000, 0, 0x8000);
memset(®s, 0, sizeof(struct pt_regs));
if (probe_isa_video())
/* No ISA board found, try the PCI bus */
regs.eax = probe_pci_video();
/* Did we succeed in mapping any video bios */
if (readw(0xc0000) == 0xaa55) {
PRINTF("Found video bios signature\n");
size = readb(0xc0002) * 512;
PRINTF("size %d\n", size);
sum = 0;
for (i = 0; i < size; i++)
sum += readb(0xc0000 + i);
PRINTF("Checksum is %sOK\n", sum ? "NOT " : "");
if (sum)
return 1;
/*
* Some video bioses (ATI Mach64) seem to think that
* the original int 10 handler is always at
* 0xf000:0xf065 , place an iret instruction there
*/
writeb(0xcf, 0xff065);
regs.esp = 0x8000;
regs.xss = 0x2000;
enter_realmode(0xc000, 3, ®s, ®s);
PRINTF("INT 0x10 vector after: %04x:%04x\n",
readw(0x42), readw(0x40));
PRINTF("BIOS returned %scarry\n",
regs.eflags & 0x00000001 ? "" : "NOT ");
#ifdef PCI_BIOS_DEBUG
print_bios_bios_stat();
#endif
return regs.eflags & 0x00000001;
}
return 1;
}
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