]> git.ipfire.org Git - people/ms/u-boot.git/blame - drivers/pci_auto.c
Patches by Stephan Linz, 30 Jan 2004:
[people/ms/u-boot.git] / drivers / pci_auto.c
CommitLineData
c609719b
WD
1/*
2 * arch/ppc/kernel/pci_auto.c
3 *
4 * PCI autoconfiguration library
5 *
6 * Author: Matt Porter <mporter@mvista.com>
7 *
8 * Copyright 2000 MontaVista Software Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 */
15
16#include <common.h>
17
18#ifdef CONFIG_PCI
19
20#include <pci.h>
21
22#undef DEBUG
23#ifdef DEBUG
24#define DEBUGF(x...) printf(x)
25#else
26#define DEBUGF(x...)
27#endif /* DEBUG */
28
29#define PCIAUTO_IDE_MODE_MASK 0x05
30
31/*
32 *
33 */
34
35void pciauto_region_init(struct pci_region* res)
36{
37 res->bus_lower = res->bus_start;
38}
39
40void pciauto_region_align(struct pci_region *res, unsigned long size)
41{
42 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
43}
44
45int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar)
46{
47 unsigned long addr;
48
49 if (!res)
50 {
51 DEBUGF("No resource");
52 goto error;
53 }
54
55 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
56
57 if (addr - res->bus_start + size > res->size)
58 {
59 DEBUGF("No room in resource");
60 goto error;
61 }
62
63 res->bus_lower = addr + size;
64
65 DEBUGF("address=0x%lx", addr);
66
67 *bar = addr;
68 return 0;
69
70 error:
71 *bar = 0xffffffff;
72 return -1;
73}
74
75/*
76 *
77 */
78
79void pciauto_setup_device(struct pci_controller *hose,
80 pci_dev_t dev, int bars_num,
81 struct pci_region *mem,
82 struct pci_region *io)
83{
84 unsigned int bar_value, bar_response, bar_size;
85 unsigned int cmdstat = 0;
86 struct pci_region *bar_res;
87 int bar, bar_nr = 0;
88 int found_mem64 = 0;
89
90 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
91 cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
92
93 for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4)
94 {
95 /* Tickle the BAR and get the response */
96 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
97 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
98
99 /* If BAR is not implemented go to the next BAR */
100 if (!bar_response)
101 continue;
102
103 found_mem64 = 0;
104
105 /* Check the BAR type and set our address mask */
106 if (bar_response & PCI_BASE_ADDRESS_SPACE)
107 {
108 bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
109 bar_res = io;
110
111 DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size);
112 }
113 else
114 {
115 if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
116 PCI_BASE_ADDRESS_MEM_TYPE_64)
117 found_mem64 = 1;
118
119 bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
120 bar_res = mem;
121
122 DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size);
123 }
124
125 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0)
126 {
127 /* Write it out and update our limit */
128 pci_hose_write_config_dword(hose, dev, bar, bar_value);
129
130 /*
131 * If we are a 64-bit decoder then increment to the
132 * upper 32 bits of the bar and force it to locate
133 * in the lower 4GB of memory.
134 */
135 if (found_mem64)
136 {
137 bar += 4;
138 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
139 }
140
141 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
142 PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
143 }
144
145 DEBUGF("\n");
146
147 bar_nr++;
148 }
149
150 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat);
151 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
152 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
153}
154
155static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
156 pci_dev_t dev, int sub_bus)
157{
158 struct pci_region *pci_mem = hose->pci_mem;
159 struct pci_region *pci_io = hose->pci_io;
160 unsigned int cmdstat;
161
162 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
163
164 /* Configure bus number registers */
165 pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev));
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166 /* TBS: passed in sub_bus is correct, removed the +1 */
167 pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus);
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168 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
169
170 if (pci_mem)
171 {
172 /* Round memory allocator to 1MB boundary */
173 pciauto_region_align(pci_mem, 0x100000);
174
175 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
176 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
177 (pci_mem->bus_lower & 0xfff00000) >> 16);
178
179 cmdstat |= PCI_COMMAND_MEMORY;
180 }
181
182 if (pci_io)
183 {
184 /* Round I/O allocator to 4KB boundary */
185 pciauto_region_align(pci_io, 0x1000);
186
187 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
188 (pci_io->bus_lower & 0x0000f000) >> 8);
189 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
190 (pci_io->bus_lower & 0xffff0000) >> 16);
191
192 cmdstat |= PCI_COMMAND_IO;
193 }
194
195 /* We don't support prefetchable memory for now, so disable */
196 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
197 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x1000);
198
199 /* Enable memory and I/O accesses, enable bus master */
200 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
201}
202
203static void pciauto_postscan_setup_bridge(struct pci_controller *hose,
204 pci_dev_t dev, int sub_bus)
205{
206 struct pci_region *pci_mem = hose->pci_mem;
207 struct pci_region *pci_io = hose->pci_io;
208
209 /* Configure bus number registers */
210 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus);
211
212 if (pci_mem)
213 {
214 /* Round memory allocator to 1MB boundary */
215 pciauto_region_align(pci_mem, 0x100000);
216
217 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
218 (pci_mem->bus_lower-1) >> 16);
219 }
220
221 if (pci_io)
222 {
223 /* Round I/O allocator to 4KB boundary */
224 pciauto_region_align(pci_io, 0x1000);
225
226 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
227 ((pci_io->bus_lower-1) & 0x0000f000) >> 8);
228 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
229 ((pci_io->bus_lower-1) & 0xffff0000) >> 16);
230 }
231}
232
233/*
234 *
235 */
236
237void pciauto_config_init(struct pci_controller *hose)
238{
239 int i;
240
241 hose->pci_io = hose->pci_mem = NULL;
242
243 for (i=0; i<hose->region_count; i++)
244 {
245 switch(hose->regions[i].flags)
246 {
247 case PCI_REGION_IO:
248 if (!hose->pci_io ||
249 hose->pci_io->size < hose->regions[i].size)
250 hose->pci_io = hose->regions + i;
251 break;
252 case PCI_REGION_MEM:
253 if (!hose->pci_mem ||
254 hose->pci_mem->size < hose->regions[i].size)
255 hose->pci_mem = hose->regions + i;
256 break;
257 }
258 }
259
260
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261 if (hose->pci_mem)
262 {
263 pciauto_region_init(hose->pci_mem);
264
265 DEBUGF("PCI Autoconfig: Memory region: [%lx-%lx]\n",
266 hose->pci_mem->bus_start,
267 hose->pci_mem->bus_start + hose->pci_mem->size - 1);
268 }
269
270 if (hose->pci_io)
271 {
272 pciauto_region_init(hose->pci_io);
273
274 DEBUGF("PCI Autoconfig: I/O region: [%lx-%lx]\n",
275 hose->pci_io->bus_start,
276 hose->pci_io->bus_start + hose->pci_io->size - 1);
277 }
278}
279
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280/* HJF: Changed this to return int. I think this is required
281 * to get the correct result when scanning bridges
282 */
283int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
c609719b 284{
c7de829c 285 unsigned int sub_bus = PCI_BUS(dev);
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286 unsigned short class;
287 unsigned char prg_iface;
5653fc33 288 int n;
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289
290 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
291
292 switch(class)
293 {
294 case PCI_CLASS_BRIDGE_PCI:
db2f721f 295 hose->current_busno++;
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296 pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_io);
297
db2f721f 298 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
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299
300 /* TBS: Passing in current_busno allows for sibling P2P bridges */
301 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
302 /*
303 * TBS: need to figure out if this is a subordinate bridge on the bus
304 * to be able to properly set the pri/sec/sub bridge registers.
305 */
306 n = pci_hose_scan_bus(hose, hose->current_busno);
307
308 /* TBS: figure out the deepest we've gone for this leg */
309 sub_bus = max(n, sub_bus);
db2f721f 310 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
5653fc33 311
db2f721f 312 sub_bus = hose->current_busno;
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313 break;
314
315 case PCI_CLASS_STORAGE_IDE:
316 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
317 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK))
318 {
319 DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
c7de829c 320 return sub_bus;
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321 }
322
323 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
324 break;
325
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326 case PCI_CLASS_BRIDGE_CARDBUS:
327 /* just do a minimal setup of the bridge, let the OS take care of the rest */
328 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_io);
329
330 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
331 PCI_DEV(dev));
332
333 hose->current_busno++;
334 break;
335
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336#ifdef CONFIG_MPC5200
337 case PCI_CLASS_BRIDGE_OTHER:
338 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
339 PCI_DEV(dev));
340 break;
341#endif
342
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343 default:
344 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
345 break;
346 }
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347
348 return sub_bus;
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349}
350
351#endif /* CONFIG_PCI */