Rev 302 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
425 | victor | 1 | $Revision: 425 $ |
261 | hidnplayr | 2 | ;*************************************************************************** |
3 | ; |
||
4 | ; PCI CODE FOLLOWS |
||
5 | ; |
||
6 | ; the following functions provide access to the PCI interface. |
||
7 | ; These functions are used by scan_bus, and also some ethernet drivers |
||
8 | ; |
||
9 | ;*************************************************************************** |
||
10 | |||
11 | ; PCI Bus defines |
||
302 | hidnplayr | 12 | PCI_HEADER_TYPE equ 0x0e ;8 bit |
13 | PCI_BASE_ADDRESS_0 equ 0x10 ;32 bit |
||
14 | PCI_BASE_ADDRESS_5 equ 0x24 ;32 bits |
||
261 | hidnplayr | 15 | PCI_BASE_ADDRESS_SPACE_IO equ 0x01 |
302 | hidnplayr | 16 | PCI_VENDOR_ID equ 0x00 ;16 bit |
261 | hidnplayr | 17 | PCI_BASE_ADDRESS_IO_MASK equ 0xFFFFFFFC |
18 | |||
19 | ;*************************************************************************** |
||
20 | ; Function |
||
21 | ; config_cmd |
||
22 | ; |
||
23 | ; Description |
||
24 | ; creates a command dword for use with the PCI bus |
||
25 | ; bus # in ebx |
||
26 | ; devfn in ecx |
||
27 | ; where in edx |
||
28 | ; |
||
29 | ; command dword returned in eax |
||
30 | ; Only eax destroyed |
||
31 | ;*************************************************************************** |
||
32 | config_cmd: |
||
33 | push ecx |
||
34 | mov eax, ebx |
||
35 | shl eax, 16 |
||
302 | hidnplayr | 36 | or eax, 0x80000000 |
261 | hidnplayr | 37 | shl ecx, 8 |
302 | hidnplayr | 38 | or eax, ecx |
261 | hidnplayr | 39 | pop ecx |
302 | hidnplayr | 40 | or eax, edx |
261 | hidnplayr | 41 | and eax, 0xFFFFFFFC |
42 | ret |
||
43 | |||
44 | ;*************************************************************************** |
||
45 | ; Function |
||
46 | ; pcibios_read_config_byte |
||
47 | ; |
||
48 | ; Description |
||
49 | ; reads a byte from the PCI config space |
||
50 | ; bus # in ebx |
||
51 | ; devfn in ecx |
||
52 | ; where in edx ( ls 16 bits significant ) |
||
53 | ; |
||
54 | ; byte returned in al ( rest of eax zero ) |
||
55 | ; Only eax/edx destroyed |
||
56 | ;*************************************************************************** |
||
57 | pcibios_read_config_byte: |
||
58 | call config_cmd |
||
59 | push dx |
||
60 | mov dx, 0xCF8 |
||
61 | out dx, eax |
||
62 | pop dx |
||
63 | |||
64 | xor eax, eax |
||
65 | and dx, 0x03 |
||
66 | add dx, 0xCFC |
||
67 | ; and dx, 0xFFC |
||
302 | hidnplayr | 68 | in al, dx |
261 | hidnplayr | 69 | ret |
70 | |||
71 | ;*************************************************************************** |
||
72 | ; Function |
||
73 | ; pcibios_read_config_word |
||
74 | ; |
||
75 | ; Description |
||
76 | ; reads a word from the PCI config space |
||
77 | ; bus # in ebx |
||
78 | ; devfn in ecx |
||
79 | ; where in edx ( ls 16 bits significant ) |
||
80 | ; |
||
81 | ; word returned in ax ( rest of eax zero ) |
||
82 | ; Only eax/edx destroyed |
||
83 | ;*************************************************************************** |
||
84 | pcibios_read_config_word: |
||
85 | call config_cmd |
||
86 | push dx |
||
87 | mov dx, 0xCF8 |
||
88 | out dx, eax |
||
89 | pop dx |
||
90 | |||
91 | xor eax, eax |
||
92 | and dx, 0x02 |
||
93 | add dx, 0xCFC |
||
94 | ; and dx, 0xFFC |
||
302 | hidnplayr | 95 | in ax, dx |
261 | hidnplayr | 96 | ret |
97 | |||
98 | ;*************************************************************************** |
||
99 | ; Function |
||
100 | ; pcibios_read_config_dword |
||
101 | ; |
||
102 | ; Description |
||
103 | ; reads a dword from the PCI config space |
||
104 | ; bus # in ebx |
||
105 | ; devfn in ecx |
||
106 | ; where in edx ( ls 16 bits significant ) |
||
107 | ; |
||
108 | ; dword returned in eax |
||
109 | ; Only eax/edx destroyed |
||
110 | ;*************************************************************************** |
||
111 | pcibios_read_config_dword: |
||
112 | push edx |
||
113 | call config_cmd |
||
114 | push dx |
||
115 | mov dx, 0xCF8 |
||
116 | out dx, eax |
||
117 | pop dx |
||
118 | xor eax, eax |
||
119 | mov dx, 0xCFC |
||
302 | hidnplayr | 120 | in eax, dx |
261 | hidnplayr | 121 | pop edx |
122 | ret |
||
123 | |||
124 | ;*************************************************************************** |
||
125 | ; Function |
||
126 | ; pcibios_write_config_byte |
||
127 | ; |
||
128 | ; Description |
||
129 | ; write a byte in al to the PCI config space |
||
130 | ; bus # in ebx |
||
131 | ; devfn in ecx |
||
132 | ; where in edx ( ls 16 bits significant ) |
||
133 | ; |
||
134 | ; Only eax/edx destroyed |
||
135 | ;*************************************************************************** |
||
136 | pcibios_write_config_byte: |
||
137 | push ax |
||
138 | call config_cmd |
||
139 | push dx |
||
140 | mov dx, 0xCF8 |
||
141 | out dx, eax |
||
142 | pop dx |
||
143 | pop ax |
||
144 | |||
145 | and dx, 0x03 |
||
146 | add dx, 0xCFC |
||
147 | out dx, al |
||
148 | ret |
||
149 | |||
150 | ;*************************************************************************** |
||
151 | ; Function |
||
152 | ; pcibios_write_config_word |
||
153 | ; |
||
154 | ; Description |
||
155 | ; write a word in ax to the PCI config space |
||
156 | ; bus # in ebx |
||
157 | ; devfn in ecx |
||
158 | ; where in edx ( ls 16 bits significant ) |
||
159 | ; |
||
160 | ; Only eax/edx destroyed |
||
161 | ;*************************************************************************** |
||
162 | pcibios_write_config_word: |
||
163 | push ax |
||
164 | call config_cmd |
||
165 | push dx |
||
166 | mov dx, 0xCF8 |
||
167 | out dx, eax |
||
168 | pop dx |
||
169 | pop ax |
||
170 | |||
171 | and dx, 0x02 |
||
172 | add dx, 0xCFC |
||
173 | out dx, ax |
||
174 | ret |
||
175 | |||
176 | ;*************************************************************************** |
||
177 | ; Function |
||
178 | ; delay_us |
||
179 | ; |
||
180 | ; Description |
||
181 | ; delays for 30 to 60 us |
||
182 | ; |
||
183 | ; I would prefer this routine to be able to delay for |
||
184 | ; a selectable number of microseconds, but this works for now. |
||
185 | ; |
||
186 | ; If you know a better way to do 2us delay, pleae tell me! |
||
187 | ;*************************************************************************** |
||
188 | delay_us: |
||
189 | push eax |
||
190 | push ecx |
||
191 | |||
192 | mov ecx,2 |
||
193 | |||
302 | hidnplayr | 194 | in al,0x61 |
261 | hidnplayr | 195 | and al,0x10 |
196 | mov ah,al |
||
197 | cld |
||
198 | |||
199 | dcnt1: |
||
302 | hidnplayr | 200 | in al,0x61 |
261 | hidnplayr | 201 | and al,0x10 |
202 | cmp al,ah |
||
302 | hidnplayr | 203 | jz dcnt1 |
261 | hidnplayr | 204 | |
205 | mov ah,al |
||
206 | loop dcnt1 |
||
207 | |||
208 | pop ecx |
||
209 | pop eax |
||
210 | |||
211 | ret |
||
212 | |||
213 | ;*************************************************************************** |
||
214 | ; Function |
||
215 | ; scan_bus |
||
216 | ; |
||
217 | ; Description |
||
218 | ; Scans the PCI bus for a supported device |
||
219 | ; If a supported device is found, the drvr_ variables are initialised |
||
220 | ; to that drivers functions ( as defined in the PCICards table) |
||
221 | ; |
||
222 | ; io_addr holds card I/O space. 32 bit, but only LS 16 bits valid |
||
223 | ; pci_data holds the PCI vendor + device code |
||
224 | ; pci_dev holds PCI bus dev # |
||
225 | ; pci_bus holds PCI bus # |
||
226 | ; |
||
227 | ; io_addr will be zero if no card found |
||
228 | ; |
||
229 | ;*************************************************************************** |
||
230 | scan_bus: |
||
231 | xor eax, eax |
||
232 | mov [hdrtype], al |
||
233 | mov [pci_data], eax |
||
234 | |||
302 | hidnplayr | 235 | xor ebx, ebx ; ebx = bus# 0 .. 255 |
261 | hidnplayr | 236 | |
237 | sb_bus_loop: |
||
302 | hidnplayr | 238 | xor ecx, ecx ; ecx = devfn# 0 .. 254 ( not 255? ) |
261 | hidnplayr | 239 | |
240 | sb_devf_loop: |
||
241 | mov eax, ecx |
||
242 | and eax, 0x07 |
||
243 | |||
244 | cmp eax, 0 |
||
245 | jne sb_001 |
||
246 | |||
247 | mov edx, PCI_HEADER_TYPE |
||
248 | call pcibios_read_config_byte |
||
249 | mov [hdrtype], al |
||
250 | jmp sb_002 |
||
251 | |||
252 | sb_001: |
||
253 | mov al, [hdrtype] |
||
254 | and al, 0x80 |
||
255 | cmp al, 0x80 |
||
256 | jne sb_inc_devf |
||
257 | |||
258 | sb_002: |
||
259 | mov edx, PCI_VENDOR_ID |
||
260 | call pcibios_read_config_dword |
||
261 | mov [vendor_device], eax |
||
262 | cmp eax, 0xffffffff |
||
302 | hidnplayr | 263 | je sb_empty |
261 | hidnplayr | 264 | cmp eax, 0 |
265 | jne sb_check_vendor |
||
266 | |||
267 | sb_empty: |
||
268 | mov [hdrtype], byte 0 |
||
269 | jmp sb_inc_devf |
||
270 | |||
271 | sb_check_vendor: |
||
272 | ; iterate though PCICards until end or match found |
||
273 | mov esi, PCICards |
||
274 | |||
275 | sb_check: |
||
276 | cmp [esi], dword 0 |
||
302 | hidnplayr | 277 | je sb_inc_devf ; Quit if at last entry |
261 | hidnplayr | 278 | cmp eax, [esi] |
302 | hidnplayr | 279 | je sb_got_card |
261 | hidnplayr | 280 | add esi, PCICARDS_ENTRY_SIZE |
281 | jmp sb_check |
||
282 | |||
283 | sb_got_card: |
||
284 | ; indicate that we have found the card |
||
285 | mov [pci_data], eax |
||
286 | mov [pci_dev], ecx |
||
287 | mov [pci_bus], ebx |
||
288 | |||
289 | ; Define the driver functions |
||
290 | push eax |
||
291 | mov eax, [esi+4] |
||
292 | mov [drvr_probe], eax |
||
293 | mov eax, [esi+8] |
||
294 | mov [drvr_reset], eax |
||
295 | mov eax, [esi+12] |
||
296 | mov [drvr_poll], eax |
||
297 | mov eax, [esi+16] |
||
298 | mov [drvr_transmit], eax |
||
302 | hidnplayr | 299 | mov eax, [esi+20] |
300 | mov [drvr_cable], eax |
||
261 | hidnplayr | 301 | pop eax |
302 | |||
303 | mov edx, PCI_BASE_ADDRESS_0 |
||
304 | |||
305 | sb_reg_check: |
||
306 | call pcibios_read_config_dword |
||
307 | mov [io_addr], eax |
||
308 | and eax, PCI_BASE_ADDRESS_IO_MASK |
||
309 | cmp eax, 0 |
||
302 | hidnplayr | 310 | je sb_inc_reg |
261 | hidnplayr | 311 | mov eax, [io_addr] |
312 | and eax, PCI_BASE_ADDRESS_SPACE_IO |
||
313 | cmp eax, 0 |
||
302 | hidnplayr | 314 | je sb_inc_reg |
261 | hidnplayr | 315 | |
316 | mov eax, [io_addr] |
||
317 | and eax, PCI_BASE_ADDRESS_IO_MASK |
||
318 | mov [io_addr], eax |
||
319 | |||
320 | sb_exit1: |
||
321 | ret |
||
322 | |||
323 | sb_inc_reg: |
||
324 | add edx, 4 |
||
325 | cmp edx, PCI_BASE_ADDRESS_5 |
||
326 | jbe sb_reg_check |
||
327 | |||
328 | sb_inc_devf: |
||
329 | inc ecx |
||
330 | cmp ecx, 255 |
||
302 | hidnplayr | 331 | jb sb_devf_loop |
261 | hidnplayr | 332 | inc ebx |
333 | cmp ebx, 256 |
||
302 | hidnplayr | 334 | jb sb_bus_loop |
261 | hidnplayr | 335 | |
336 | ; We get here if we didn't find our card |
||
337 | ; set io_addr to 0 as an indication |
||
338 | xor eax, eax |
||
339 | mov [io_addr], eax |
||
340 | |||
341 | sb_exit2: |
||
342 | ret |