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git.ipfire.org Git - people/ms/u-boot.git/blob - arch/x86/lib/pci.c
3 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #undef PCI_ROM_SCAN_VERBOSE
31 int pci_shadow_rom(pci_dev_t dev
, unsigned char *dest
)
33 struct pci_controller
*hose
;
45 hose
= pci_bus_to_hose(PCI_BUS(dev
));
47 printf("pci_shadow_rom() asked to shadow device %x to %x\n",
50 pci_read_config_word(dev
, PCI_VENDOR_ID
, &vendor
);
51 pci_read_config_word(dev
, PCI_DEVICE_ID
, &device
);
52 pci_read_config_dword(dev
, PCI_CLASS_REVISION
, &class_code
);
54 class_code
&= 0xffffff00;
57 debug("PCI Header Vendor %04x device %04x class %06x\n",
58 vendor
, device
, class_code
);
60 /* Enable the rom addess decoder */
61 pci_write_config_dword(dev
, PCI_ROM_ADDRESS
, (u32
)PCI_ROM_ADDRESS_MASK
);
62 pci_read_config_dword(dev
, PCI_ROM_ADDRESS
, &addr_reg
);
65 /* register unimplemented */
66 printf("pci_chadow_rom: device do not seem to have a rom\n");
70 size
= (~(addr_reg
&PCI_ROM_ADDRESS_MASK
))+1;
72 debug("ROM is %d bytes\n", size
);
74 rom_addr
= pci_get_rom_window(hose
, size
);
76 debug("ROM mapped at %x\n", rom_addr
);
78 pci_write_config_dword(dev
, PCI_ROM_ADDRESS
,
79 pci_phys_to_mem(dev
, rom_addr
)
80 |PCI_ROM_ADDRESS_ENABLE
);
83 for (i
=rom_addr
;i
<rom_addr
+size
; i
+=512) {
86 if (readw(i
) == 0xaa55) {
88 #ifdef PCI_ROM_SCAN_VERBOSE
89 printf("ROM signature found\n");
91 pci_data
= readw(0x18+i
);
94 if (0==memcmp((void*)pci_data
, "PCIR", 4)) {
95 #ifdef PCI_ROM_SCAN_VERBOSE
96 printf("Fount PCI rom image at offset %d\n", i
-rom_addr
);
97 printf("Vendor %04x device %04x class %06x\n",
98 readw(pci_data
+4), readw(pci_data
+6),
99 readl(pci_data
+0x0d)&0xffffff);
101 (readw(pci_data
+0x15) &0x80)?
102 "Last image":"More images follow");
103 switch (readb(pci_data
+0x14)) {
105 printf("X86 code\n");
108 printf("Openfirmware code\n");
111 printf("PARISC code\n");
114 printf("Image size %d\n", readw(pci_data
+0x10) * 512);
116 /* FixMe: I think we should compare the class code
117 * bytes as well but I have no reference on the
118 * exact order of these bytes in the PCI ROM header */
119 if (readw(pci_data
+4) == vendor
&&
120 readw(pci_data
+6) == device
&&
121 /* (readl(pci_data+0x0d)&0xffffff) == class_code && */
122 readb(pci_data
+0x14) == 0 /* x86 code image */ ) {
123 #ifdef PCI_ROM_SCAN_VERBOSE
124 printf("Suitable ROM image found, copying\n");
126 memmove(dest
, (void*)rom_addr
, readw(pci_data
+0x10) * 512);
131 if (readw(pci_data
+0x15) &0x80) {
139 #ifdef PCI_ROM_SCAN_VERBOSE
141 printf("No suitable image found\n");
144 /* disable PAR register and PCI device ROM address devocer */
145 pci_remove_rom_window(hose
, rom_addr
);
147 pci_write_config_dword(dev
, PCI_ROM_ADDRESS
, 0);