summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/pci_auto.c
blob: ee20a86fcc4ba5295495ca0c535d0ec26e1dfeb1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
/*
 * PCI autoconfiguration library
 *
 * Author: Matt Porter <mporter@mvista.com>
 *
 * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

/*
 * The CardBus support is very preliminary.  Preallocating space is
 * the way to go but will require some change in card services to
 * make it useful.  Eventually this will ensure that we can put
 * multiple CB bridges behind multiple P2P bridges.  For now, at
 * least it ensures that we place the CB bridge BAR and assigned
 * initial bus numbers.  I definitely need to do something about
 * the lack of 16-bit I/O support. -MDP
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>

#include <asm/pci-bridge.h>

#define	PCIAUTO_IDE_MODE_MASK		0x05

#undef DEBUG

#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif /* DEBUG */

static int pciauto_upper_iospc;
static int pciauto_upper_memspc;

void __init pciauto_setup_bars(struct pci_controller *hose,
		int current_bus,
		int pci_devfn,
		int bar_limit)
{
	int bar_response, bar_size, bar_value;
	int bar, addr_mask;
	int * upper_limit;
	int found_mem64 = 0;

	DBG("PCI Autoconfig: Found Bus %d, Device %d, Function %d\n",
		current_bus, PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn) );

	for (bar = PCI_BASE_ADDRESS_0; bar <= bar_limit; bar+=4) {
		/* Tickle the BAR and get the response */
		early_write_config_dword(hose,
				current_bus,
				pci_devfn,
				bar,
				0xffffffff);
		early_read_config_dword(hose,
				current_bus,
				pci_devfn,
				bar,
				&bar_response);

		/* If BAR is not implemented go to the next BAR */
		if (!bar_response)
			continue;

		/* Check the BAR type and set our address mask */
		if (bar_response & PCI_BASE_ADDRESS_SPACE) {
			addr_mask = PCI_BASE_ADDRESS_IO_MASK;
			upper_limit = &pciauto_upper_iospc;
			DBG("PCI Autoconfig: BAR 0x%x, I/O, ", bar);
		} else {
			if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
			PCI_BASE_ADDRESS_MEM_TYPE_64)
				found_mem64 = 1;

			addr_mask = PCI_BASE_ADDRESS_MEM_MASK;	
			upper_limit = &pciauto_upper_memspc;
			DBG("PCI Autoconfig: BAR 0x%x, Mem ", bar);
		}

		/* Calculate requested size */
		bar_size = ~(bar_response & addr_mask) + 1;

		/* Allocate a base address */
		bar_value = (*upper_limit - bar_size) & ~(bar_size - 1);

		/* Write it out and update our limit */
		early_write_config_dword(hose,
				current_bus,
				pci_devfn,
				bar,
				bar_value);

		*upper_limit = bar_value;

		/*
		 * If we are a 64-bit decoder then increment to the
		 * upper 32 bits of the bar and force it to locate
		 * in the lower 4GB of memory.
		 */
		if (found_mem64) {
			bar += 4;
			early_write_config_dword(hose,
					current_bus,
					pci_devfn,
					bar,
					0x00000000);
			found_mem64 = 0;
		}

		DBG("size=0x%x, address=0x%x\n",
			bar_size, bar_value);
	}

}

void __init pciauto_prescan_setup_bridge(struct pci_controller *hose,
		int current_bus,
		int pci_devfn,
		int sub_bus,
		int *iosave,
		int *memsave)
{
	/* Configure bus number registers */
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_PRIMARY_BUS,
			current_bus);
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SECONDARY_BUS,
			sub_bus + 1);
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SUBORDINATE_BUS,
			0xff);

	/* Round memory allocator to 1MB boundary */
	pciauto_upper_memspc &= ~(0x100000 - 1);
	*memsave = pciauto_upper_memspc;

	/* Round I/O allocator to 4KB boundary */
	pciauto_upper_iospc &= ~(0x1000 - 1);
	*iosave = pciauto_upper_iospc;

	/* Set up memory and I/O filter limits, assume 32-bit I/O space */
	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_MEMORY_LIMIT,
			((pciauto_upper_memspc - 1) & 0xfff00000) >> 16);
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_IO_LIMIT,
			((pciauto_upper_iospc - 1) & 0x0000f000) >> 8);
	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_IO_LIMIT_UPPER16,
			((pciauto_upper_iospc - 1) & 0xffff0000) >> 16);

	/* Zero upper 32 bits of prefetchable base/limit */
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_PREF_BASE_UPPER32,
			0);
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_PREF_LIMIT_UPPER32,
			0);
}

void __init pciauto_postscan_setup_bridge(struct pci_controller *hose,
		int current_bus,
		int pci_devfn,
		int sub_bus,
		int *iosave,
		int *memsave)
{
	int cmdstat;

	/* Configure bus number registers */
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SUBORDINATE_BUS,
			sub_bus);

	/*
	 * Round memory allocator to 1MB boundary.
	 * If no space used, allocate minimum.
	 */
	pciauto_upper_memspc &= ~(0x100000 - 1);
	if (*memsave == pciauto_upper_memspc)
		pciauto_upper_memspc -= 0x00100000;

	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_MEMORY_BASE,
			pciauto_upper_memspc >> 16);

	/* Allocate 1MB for pre-fretch */
	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_PREF_MEMORY_LIMIT,
			((pciauto_upper_memspc - 1) & 0xfff00000) >> 16);

	pciauto_upper_memspc -= 0x100000;

	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_PREF_MEMORY_BASE,
			pciauto_upper_memspc >> 16);

	/* Round I/O allocator to 4KB boundary */
	pciauto_upper_iospc &= ~(0x1000 - 1);
	if (*iosave == pciauto_upper_iospc)
		pciauto_upper_iospc -= 0x1000;

	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_IO_BASE,
			(pciauto_upper_iospc & 0x0000f000) >> 8);
	early_write_config_word(hose,
			current_bus,
			pci_devfn,
			PCI_IO_BASE_UPPER16,
			pciauto_upper_iospc >> 16);

	/* Enable memory and I/O accesses, enable bus master */
	early_read_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_COMMAND,
			&cmdstat);
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_COMMAND,
			cmdstat |
			PCI_COMMAND_IO |
			PCI_COMMAND_MEMORY |
			PCI_COMMAND_MASTER);
}

void __init pciauto_prescan_setup_cardbus_bridge(struct pci_controller *hose,
		int current_bus,
		int pci_devfn,
		int sub_bus,
		int *iosave,
		int *memsave)
{
	/* Configure bus number registers */
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_PRIMARY_BUS,
			current_bus);
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SECONDARY_BUS,
			sub_bus + 1);
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SUBORDINATE_BUS,
			0xff);

	/* Round memory allocator to 4KB boundary */
	pciauto_upper_memspc &= ~(0x1000 - 1);
	*memsave = pciauto_upper_memspc;

	/* Round I/O allocator to 4 byte boundary */
	pciauto_upper_iospc &= ~(0x4 - 1);
	*iosave = pciauto_upper_iospc;

	/* Set up memory and I/O filter limits, assume 32-bit I/O space */
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			0x20,
			pciauto_upper_memspc - 1);
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			0x30,
			pciauto_upper_iospc - 1);
}

void __init pciauto_postscan_setup_cardbus_bridge(struct pci_controller *hose,
		int current_bus,
		int pci_devfn,
		int sub_bus,
		int *iosave,
		int *memsave)
{
	int cmdstat;

	/*
	 * Configure subordinate bus number.  The PCI subsystem
	 * bus scan will renumber buses (reserving three additional
	 * for this PCI<->CardBus bridge for the case where a CardBus
	 * adapter contains a P2P or CB2CB bridge.
	 */
	early_write_config_byte(hose,
			current_bus,
			pci_devfn,
			PCI_SUBORDINATE_BUS,
			sub_bus);

	/*
	 * Reserve an additional 4MB for mem space and 16KB for
	 * I/O space.  This should cover any additional space
	 * requirement of unusual CardBus devices with
	 * additional bridges that can consume more address space.
	 *
	 * Although pcmcia-cs currently will reprogram bridge
	 * windows, the goal is to add an option to leave them
	 * alone and use the bridge window ranges as the regions
	 * that are searched for free resources upon hot-insertion
	 * of a device.  This will allow a PCI<->CardBus bridge
	 * configured by this routine to happily live behind a
	 * P2P bridge in a system.
	 */
	pciauto_upper_memspc -= 0x00400000;
	pciauto_upper_iospc -= 0x00004000;

	/* Round memory allocator to 4KB boundary */
	pciauto_upper_memspc &= ~(0x1000 - 1);

	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			0x1c,
			pciauto_upper_memspc);

	/* Round I/O allocator to 4 byte boundary */
	pciauto_upper_iospc &= ~(0x4 - 1);
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			0x2c,
			pciauto_upper_iospc);

	/* Enable memory and I/O accesses, enable bus master */
	early_read_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_COMMAND,
			&cmdstat);
	early_write_config_dword(hose,
			current_bus,
			pci_devfn,
			PCI_COMMAND,
			cmdstat |
			PCI_COMMAND_IO |
			PCI_COMMAND_MEMORY |
			PCI_COMMAND_MASTER);
}

int __init pciauto_bus_scan(struct pci_controller *hose, int current_bus)
{
	int sub_bus, pci_devfn, pci_class, cmdstat, found_multi = 0;
	unsigned short vid;
	unsigned char header_type;

	/*
	 * Fetch our I/O and memory space upper boundaries used
	 * to allocated base addresses on this hose.
	 */
	if (current_bus == hose->first_busno) {
		pciauto_upper_iospc = hose->io_space.end + 1;
		pciauto_upper_memspc = hose->mem_space.end + 1;
	}

	sub_bus = current_bus;

	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
		/* Skip our host bridge */
		if ( (current_bus == hose->first_busno) && (pci_devfn == 0) )
			continue;

		if (PCI_FUNC(pci_devfn) && !found_multi)
			continue;

		/* If config space read fails from this device, move on */
		if (early_read_config_byte(hose,
				current_bus,
				pci_devfn,
				PCI_HEADER_TYPE,
				&header_type))
			continue;

		if (!PCI_FUNC(pci_devfn))
			found_multi = header_type & 0x80;

		early_read_config_word(hose,
				current_bus,
				pci_devfn,
				PCI_VENDOR_ID,
				&vid);

		if (vid != 0xffff) {
			early_read_config_dword(hose,
					current_bus,
					pci_devfn,
					PCI_CLASS_REVISION, &pci_class);
			if ( (pci_class >> 16) == PCI_CLASS_BRIDGE_PCI ) {
				int iosave, memsave;

				DBG("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_SLOT(pci_devfn));
				/* Allocate PCI I/O and/or memory space */
				pciauto_setup_bars(hose,
						current_bus,
						pci_devfn,
						PCI_BASE_ADDRESS_1);

				pciauto_prescan_setup_bridge(hose,
						current_bus,
						pci_devfn,
						sub_bus,
						&iosave,
						&memsave);
				sub_bus = pciauto_bus_scan(hose, sub_bus+1);
				pciauto_postscan_setup_bridge(hose,
						current_bus,
						pci_devfn,
						sub_bus,
						&iosave,
						&memsave);
			} else if ((pci_class >> 16) == PCI_CLASS_BRIDGE_CARDBUS) {
				int iosave, memsave;

				DBG("PCI Autoconfig: Found CardBus bridge, device %d function %d\n", PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn));
				/* Place CardBus Socket/ExCA registers */
				pciauto_setup_bars(hose,
						current_bus,
						pci_devfn,
						PCI_BASE_ADDRESS_0);

				pciauto_prescan_setup_cardbus_bridge(hose,
						current_bus,
						pci_devfn,
						sub_bus,
						&iosave,
						&memsave);
				sub_bus = pciauto_bus_scan(hose, sub_bus+1);
				pciauto_postscan_setup_cardbus_bridge(hose,
						current_bus,
						pci_devfn,
						sub_bus,
						&iosave,
						&memsave);
			} else {
				if ((pci_class >> 16) == PCI_CLASS_STORAGE_IDE) {
					unsigned char prg_iface;

					early_read_config_byte(hose,
							current_bus,
							pci_devfn,
							PCI_CLASS_PROG,
							&prg_iface);
					if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
						DBG("PCI Autoconfig: Skipping legacy mode IDE controller\n");
						continue;
					}
				}
				/* Allocate PCI I/O and/or memory space */
				pciauto_setup_bars(hose,
						current_bus,
						pci_devfn,
						PCI_BASE_ADDRESS_5);

				/*
				 * Enable some standard settings
				 */
				early_read_config_dword(hose,
						current_bus,
						pci_devfn,
						PCI_COMMAND,
						&cmdstat);
				early_write_config_dword(hose,
						current_bus,
						pci_devfn,
						PCI_COMMAND,
						cmdstat |
						PCI_COMMAND_IO |
						PCI_COMMAND_MEMORY |
						PCI_COMMAND_MASTER);
				early_write_config_byte(hose,
						current_bus,
						pci_devfn,
						PCI_LATENCY_TIMER,
						0x80);
			}
		}
	}
	return sub_bus;
}
OpenPOWER on IntegriCloud