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x86: Add processor flags header from linux
[u-boot] / arch / i386 / lib / pci.c
1 /*
2  * (C) Copyright 2002
3  * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
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.
12  *
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.
17  *
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,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25 #include <pci.h>
26 #include <asm/io.h>
27 #include <asm/pci.h>
28
29 #undef PCI_ROM_SCAN_VERBOSE
30
31 int pci_shadow_rom(pci_dev_t dev, unsigned char *dest)
32 {
33         struct pci_controller *hose;
34         int res = -1;
35         int i;
36
37         u32 rom_addr;
38         u32 addr_reg;
39         u32 size;
40
41         u16 vendor;
42         u16 device;
43         u32 class_code;
44
45         hose = pci_bus_to_hose(PCI_BUS(dev));
46 #if 0
47         printf("pci_shadow_rom() asked to shadow device %x to %x\n",
48                dev, (u32)dest);
49 #endif
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);
53
54         class_code &= 0xffffff00;
55         class_code >>= 8;
56
57 #if 0
58         printf("PCI Header Vendor %04x device %04x class %06x\n",
59                vendor, device, class_code);
60 #endif
61         /* Enable the rom addess decoder */
62         pci_write_config_dword(dev, PCI_ROM_ADDRESS, (u32)PCI_ROM_ADDRESS_MASK);
63         pci_read_config_dword(dev, PCI_ROM_ADDRESS, &addr_reg);
64
65         if (!addr_reg) {
66                 /* register unimplemented */
67                 printf("pci_chadow_rom: device do not seem to have a rom\n");
68                 return -1;
69         }
70
71         size = (~(addr_reg&PCI_ROM_ADDRESS_MASK))+1;
72
73 #if 0
74         printf("ROM is %d bytes\n", size);
75 #endif
76         rom_addr = pci_get_rom_window(hose, size);
77 #if 0
78         printf("ROM mapped at %x \n", rom_addr);
79 #endif
80         pci_write_config_dword(dev, PCI_ROM_ADDRESS,
81                                pci_phys_to_mem(dev, rom_addr)
82                                |PCI_ROM_ADDRESS_ENABLE);
83
84
85         for (i=rom_addr;i<rom_addr+size; i+=512) {
86
87
88                 if (readw(i) == 0xaa55) {
89                         u32 pci_data;
90 #ifdef PCI_ROM_SCAN_VERBOSE
91                         printf("ROM signature found\n");
92 #endif
93                         pci_data = readw(0x18+i);
94                         pci_data += i;
95
96                         if (0==memcmp((void*)pci_data, "PCIR", 4)) {
97 #ifdef PCI_ROM_SCAN_VERBOSE
98                                 printf("Fount PCI rom image at offset %d\n", i-rom_addr);
99                                 printf("Vendor %04x device %04x class %06x\n",
100                                        readw(pci_data+4), readw(pci_data+6),
101                                        readl(pci_data+0x0d)&0xffffff);
102                                 printf("%s\n",
103                                        (readw(pci_data+0x15) &0x80)?
104                                        "Last image":"More images follow");
105                                 switch  (readb(pci_data+0x14)) {
106                                 case 0:
107                                         printf("X86 code\n");
108                                         break;
109                                 case 1:
110                                         printf("Openfirmware code\n");
111                                         break;
112                                 case 2:
113                                         printf("PARISC code\n");
114                                         break;
115                                 }
116                                 printf("Image size %d\n", readw(pci_data+0x10) * 512);
117 #endif
118                                 /* FixMe: I think we should compare the class code
119                                  * bytes as well but I have no reference on the
120                                  * exact order of these bytes in the PCI ROM header */
121                                 if (readw(pci_data+4) == vendor &&
122                                     readw(pci_data+6) == device &&
123                                     /* (readl(pci_data+0x0d)&0xffffff) == class_code && */
124                                     readb(pci_data+0x14) == 0 /* x86 code image */ ) {
125 #ifdef PCI_ROM_SCAN_VERBOSE
126                                         printf("Suitable ROM image found, copying\n");
127 #endif
128                                         memmove(dest, (void*)rom_addr, readw(pci_data+0x10) * 512);
129                                         res = 0;
130                                         break;
131
132                                 }
133                                 if (readw(pci_data+0x15) &0x80) {
134                                         break;
135                                 }
136                         }
137                 }
138
139         }
140
141 #ifdef PCI_ROM_SCAN_VERBOSE
142         if (res) {
143                 printf("No suitable image found\n");
144         }
145 #endif
146         /* disable PAR register and PCI device ROM address devocer */
147         pci_remove_rom_window(hose, rom_addr);
148
149         pci_write_config_dword(dev, PCI_ROM_ADDRESS, 0);
150
151         return res;
152 }