upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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196 lines
4.5 KiB
196 lines
4.5 KiB
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <pci.h>
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#include <malloc.h>
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#include <asm/ptrace.h>
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#include <asm/realmode.h>
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#include <asm/io.h>
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#include <asm/pci.h>
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#include "bios.h"
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#undef PCI_BIOS_DEBUG
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#undef VGA_BIOS_DEBUG
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#ifdef VGA_BIOS_DEBUG
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#define PRINTF(fmt, args...) printf(fmt, ##args)
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#else
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#define PRINTF(fmt, args...)
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#endif
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#define PCI_CLASS_VIDEO 3
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#define PCI_CLASS_VIDEO_STD 0
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#define PCI_CLASS_VIDEO_PROG_IF_VGA 0
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DEFINE_PCI_DEVICE_TABLE(supported) = {
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{PCI_VIDEO_VENDOR_ID, PCI_VIDEO_DEVICE_ID},
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{}
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};
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static u32 probe_pci_video(void)
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{
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struct pci_controller *hose;
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pci_dev_t devbusfn = pci_find_devices(supported, 0);
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if ((devbusfn != -1)) {
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u32 old;
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u32 addr;
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/* PCI video device detected */
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printf("Found PCI VGA device at %02x.%02x.%x\n",
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PCI_BUS(devbusfn),
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PCI_DEV(devbusfn),
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PCI_FUNC(devbusfn));
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/* Enable I/O decoding as well, PCI viudeo boards
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* support I/O accesses, but they provide no
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* bar register for this since the ports are fixed.
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*/
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pci_write_config_word(devbusfn,
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PCI_COMMAND,
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PCI_COMMAND_MEMORY |
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PCI_COMMAND_IO |
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PCI_COMMAND_MASTER);
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/* Test the ROM decoder, do the device support a rom? */
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pci_read_config_dword(devbusfn, PCI_ROM_ADDRESS, &old);
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pci_write_config_dword(devbusfn, PCI_ROM_ADDRESS,
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(u32)PCI_ROM_ADDRESS_MASK);
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pci_read_config_dword(devbusfn, PCI_ROM_ADDRESS, &addr);
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pci_write_config_dword(devbusfn, PCI_ROM_ADDRESS, old);
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if (!addr) {
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printf("PCI VGA have no ROM?\n");
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return 0;
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}
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/* device have a rom */
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if (pci_shadow_rom(devbusfn, (void *)0xc0000)) {
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printf("Shadowing of PCI VGA BIOS failed\n");
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return 0;
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}
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/* Now enable lagacy VGA port access */
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hose = pci_bus_to_hose(PCI_BUS(devbusfn));
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if (pci_enable_legacy_video_ports(hose)) {
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printf("PCI VGA enable failed\n");
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return 0;
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}
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/* return the pci device info, that we'll need later */
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return PCI_BUS(devbusfn) << 8 |
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PCI_DEV(devbusfn) << 3 | (PCI_FUNC(devbusfn) & 7);
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}
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return 0;
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}
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static int probe_isa_video(void)
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{
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u32 ptr;
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char *buf;
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ptr = isa_map_rom(0xc0000, 0x8000);
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if (!ptr)
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return -1;
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buf = malloc(0x8000);
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if (!buf) {
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isa_unmap_rom(ptr);
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return -1;
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}
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if (readw(ptr) != 0xaa55) {
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free(buf);
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isa_unmap_rom(ptr);
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return -1;
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}
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/* shadow the rom */
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memcpy(buf, (void *)ptr, 0x8000);
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isa_unmap_rom(ptr);
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memcpy((void *)0xc0000, buf, 0x8000);
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free(buf);
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return 0;
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}
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int video_bios_init(void)
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{
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struct pt_regs regs;
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int size;
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int i;
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u8 sum;
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/* clear the video bios area in case we warmbooted */
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memset((void *)0xc0000, 0, 0x8000);
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memset(®s, 0, sizeof(struct pt_regs));
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if (probe_isa_video())
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/* No ISA board found, try the PCI bus */
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regs.eax = probe_pci_video();
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/* Did we succeed in mapping any video bios */
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if (readw(0xc0000) == 0xaa55) {
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PRINTF("Found video bios signature\n");
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size = readb(0xc0002) * 512;
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PRINTF("size %d\n", size);
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sum = 0;
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for (i = 0; i < size; i++)
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sum += readb(0xc0000 + i);
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PRINTF("Checksum is %sOK\n", sum ? "NOT " : "");
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if (sum)
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return 1;
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/*
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* Some video bioses (ATI Mach64) seem to think that
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* the original int 10 handler is always at
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* 0xf000:0xf065 , place an iret instruction there
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*/
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writeb(0xcf, 0xff065);
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regs.esp = 0x8000;
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regs.xss = 0x2000;
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enter_realmode(0xc000, 3, ®s, ®s);
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PRINTF("INT 0x10 vector after: %04x:%04x\n",
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readw(0x42), readw(0x40));
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PRINTF("BIOS returned %scarry\n",
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regs.eflags & 0x00000001 ? "" : "NOT ");
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#ifdef PCI_BIOS_DEBUG
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print_bios_bios_stat();
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#endif
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return regs.eflags & 0x00000001;
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}
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return 1;
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}
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