xref: /linux/arch/powerpc/platforms/powermac/pci.c (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Support for PCI bridges found on Power Macintoshes.
4  *
5  * Copyright (C) 2003-2005 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
6  * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/delay.h>
12 #include <linux/string.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/of_pci.h>
18 
19 #include <asm/sections.h>
20 #include <asm/io.h>
21 #include <asm/pci-bridge.h>
22 #include <asm/machdep.h>
23 #include <asm/pmac_feature.h>
24 #include <asm/grackle.h>
25 #include <asm/ppc-pci.h>
26 
27 #include "pmac.h"
28 
29 #undef DEBUG
30 
31 #ifdef DEBUG
32 #define DBG(x...) printk(x)
33 #else
34 #define DBG(x...)
35 #endif
36 
37 /* XXX Could be per-controller, but I don't think we risk anything by
38  * assuming we won't have both UniNorth and Bandit */
39 static int has_uninorth;
40 #ifdef CONFIG_PPC64
41 static struct pci_controller *u3_agp;
42 #else
43 static int has_second_ohare;
44 #endif /* CONFIG_PPC64 */
45 
46 extern int pcibios_assign_bus_offset;
47 
48 struct device_node *k2_skiplist[2];
49 
50 /*
51  * Magic constants for enabling cache coherency in the bandit/PSX bridge.
52  */
53 #define BANDIT_DEVID_2	8
54 #define BANDIT_REVID	3
55 
56 #define BANDIT_DEVNUM	11
57 #define BANDIT_MAGIC	0x50
58 #define BANDIT_COHERENT	0x40
59 
fixup_one_level_bus_range(struct device_node * node,int higher)60 static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
61 {
62 	for (; node; node = node->sibling) {
63 		const int * bus_range;
64 		const unsigned int *class_code;
65 		int len;
66 
67 		/* For PCI<->PCI bridges or CardBus bridges, we go down */
68 		class_code = of_get_property(node, "class-code", NULL);
69 		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
70 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
71 			continue;
72 		bus_range = of_get_property(node, "bus-range", &len);
73 		if (bus_range != NULL && len > 2 * sizeof(int)) {
74 			if (bus_range[1] > higher)
75 				higher = bus_range[1];
76 		}
77 		higher = fixup_one_level_bus_range(node->child, higher);
78 	}
79 	return higher;
80 }
81 
82 /* This routine fixes the "bus-range" property of all bridges in the
83  * system since they tend to have their "last" member wrong on macs
84  *
85  * Note that the bus numbers manipulated here are OF bus numbers, they
86  * are not Linux bus numbers.
87  */
fixup_bus_range(struct device_node * bridge)88 static void __init fixup_bus_range(struct device_node *bridge)
89 {
90 	int *bus_range, len;
91 	struct property *prop;
92 
93 	/* Lookup the "bus-range" property for the hose */
94 	prop = of_find_property(bridge, "bus-range", &len);
95 	if (prop == NULL || prop->length < 2 * sizeof(int))
96 		return;
97 
98 	bus_range = prop->value;
99 	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
100 }
101 
102 /*
103  * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
104  *
105  * The "Bandit" version is present in all early PCI PowerMacs,
106  * and up to the first ones using Grackle. Some machines may
107  * have 2 bandit controllers (2 PCI busses).
108  *
109  * "Chaos" is used in some "Bandit"-type machines as a bridge
110  * for the separate display bus. It is accessed the same
111  * way as bandit, but cannot be probed for devices. It therefore
112  * has its own config access functions.
113  *
114  * The "UniNorth" version is present in all Core99 machines
115  * (iBook, G4, new IMacs, and all the recent Apple machines).
116  * It contains 3 controllers in one ASIC.
117  *
118  * The U3 is the bridge used on G5 machines. It contains an
119  * AGP bus which is dealt with the old UniNorth access routines
120  * and a HyperTransport bus which uses its own set of access
121  * functions.
122  */
123 
124 #define MACRISC_CFA0(devfn, off)	\
125 	((1 << (unsigned int)PCI_SLOT(dev_fn)) \
126 	| (((unsigned int)PCI_FUNC(dev_fn)) << 8) \
127 	| (((unsigned int)(off)) & 0xFCUL))
128 
129 #define MACRISC_CFA1(bus, devfn, off)	\
130 	((((unsigned int)(bus)) << 16) \
131 	|(((unsigned int)(devfn)) << 8) \
132 	|(((unsigned int)(off)) & 0xFCUL) \
133 	|1UL)
134 
macrisc_cfg_map_bus(struct pci_bus * bus,unsigned int dev_fn,int offset)135 static void __iomem *macrisc_cfg_map_bus(struct pci_bus *bus,
136 					 unsigned int dev_fn,
137 					 int offset)
138 {
139 	unsigned int caddr;
140 	struct pci_controller *hose;
141 
142 	hose = pci_bus_to_host(bus);
143 	if (hose == NULL)
144 		return NULL;
145 
146 	if (bus->number == hose->first_busno) {
147 		if (dev_fn < (11 << 3))
148 			return NULL;
149 		caddr = MACRISC_CFA0(dev_fn, offset);
150 	} else
151 		caddr = MACRISC_CFA1(bus->number, dev_fn, offset);
152 
153 	/* Uninorth will return garbage if we don't read back the value ! */
154 	do {
155 		out_le32(hose->cfg_addr, caddr);
156 	} while (in_le32(hose->cfg_addr) != caddr);
157 
158 	offset &= has_uninorth ? 0x07 : 0x03;
159 	return hose->cfg_data + offset;
160 }
161 
162 static struct pci_ops macrisc_pci_ops =
163 {
164 	.map_bus = macrisc_cfg_map_bus,
165 	.read = pci_generic_config_read,
166 	.write = pci_generic_config_write,
167 };
168 
169 #ifdef CONFIG_PPC32
170 /*
171  * Verify that a specific (bus, dev_fn) exists on chaos
172  */
chaos_map_bus(struct pci_bus * bus,unsigned int devfn,int offset)173 static void __iomem *chaos_map_bus(struct pci_bus *bus, unsigned int devfn,
174 				   int offset)
175 {
176 	struct device_node *np;
177 	const u32 *vendor, *device;
178 
179 	if (offset >= 0x100)
180 		return NULL;
181 	np = of_pci_find_child_device(bus->dev.of_node, devfn);
182 	if (np == NULL)
183 		return NULL;
184 
185 	vendor = of_get_property(np, "vendor-id", NULL);
186 	device = of_get_property(np, "device-id", NULL);
187 	if (vendor == NULL || device == NULL)
188 		return NULL;
189 
190 	if ((*vendor == 0x106b) && (*device == 3) && (offset >= 0x10)
191 	    && (offset != 0x14) && (offset != 0x18) && (offset <= 0x24))
192 		return NULL;
193 
194 	return macrisc_cfg_map_bus(bus, devfn, offset);
195 }
196 
197 static struct pci_ops chaos_pci_ops =
198 {
199 	.map_bus = chaos_map_bus,
200 	.read = pci_generic_config_read,
201 	.write = pci_generic_config_write,
202 };
203 
setup_chaos(struct pci_controller * hose,struct resource * addr)204 static void __init setup_chaos(struct pci_controller *hose,
205 			       struct resource *addr)
206 {
207 	/* assume a `chaos' bridge */
208 	hose->ops = &chaos_pci_ops;
209 	hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
210 	hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
211 }
212 #endif /* CONFIG_PPC32 */
213 
214 #ifdef CONFIG_PPC64
215 /*
216  * These versions of U3 HyperTransport config space access ops do not
217  * implement self-view of the HT host yet
218  */
219 
220 /*
221  * This function deals with some "special cases" devices.
222  *
223  *  0 -> No special case
224  *  1 -> Skip the device but act as if the access was successful
225  *       (return 0xff's on reads, eventually, cache config space
226  *       accesses in a later version)
227  * -1 -> Hide the device (unsuccessful access)
228  */
u3_ht_skip_device(struct pci_controller * hose,struct pci_bus * bus,unsigned int devfn)229 static int u3_ht_skip_device(struct pci_controller *hose,
230 			     struct pci_bus *bus, unsigned int devfn)
231 {
232 	struct device_node *busdn, *dn;
233 	int i;
234 
235 	/* We only allow config cycles to devices that are in OF device-tree
236 	 * as we are apparently having some weird things going on with some
237 	 * revs of K2 on recent G5s, except for the host bridge itself, which
238 	 * is missing from the tree but we know we can probe.
239 	 */
240 	if (bus->self)
241 		busdn = pci_device_to_OF_node(bus->self);
242 	else if (devfn == 0)
243 		return 0;
244 	else
245 		busdn = hose->dn;
246 	for (dn = busdn->child; dn; dn = dn->sibling)
247 		if (PCI_DN(dn) && PCI_DN(dn)->devfn == devfn)
248 			break;
249 	if (dn == NULL)
250 		return -1;
251 
252 	/*
253 	 * When a device in K2 is powered down, we die on config
254 	 * cycle accesses. Fix that here.
255 	 */
256 	for (i=0; i<2; i++)
257 		if (k2_skiplist[i] == dn)
258 			return 1;
259 
260 	return 0;
261 }
262 
263 #define U3_HT_CFA0(devfn, off)		\
264 		((((unsigned int)devfn) << 8) | offset)
265 #define U3_HT_CFA1(bus, devfn, off)	\
266 		(U3_HT_CFA0(devfn, off) \
267 		+ (((unsigned int)bus) << 16) \
268 		+ 0x01000000UL)
269 
u3_ht_cfg_access(struct pci_controller * hose,u8 bus,u8 devfn,u8 offset,int * swap)270 static void __iomem *u3_ht_cfg_access(struct pci_controller *hose, u8 bus,
271 				      u8 devfn, u8 offset, int *swap)
272 {
273 	*swap = 1;
274 	if (bus == hose->first_busno) {
275 		if (devfn != 0)
276 			return hose->cfg_data + U3_HT_CFA0(devfn, offset);
277 		*swap = 0;
278 		return ((void __iomem *)hose->cfg_addr) + (offset << 2);
279 	} else
280 		return hose->cfg_data + U3_HT_CFA1(bus, devfn, offset);
281 }
282 
u3_ht_read_config(struct pci_bus * bus,unsigned int devfn,int offset,int len,u32 * val)283 static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
284 				    int offset, int len, u32 *val)
285 {
286 	struct pci_controller *hose;
287 	void __iomem *addr;
288 	int swap;
289 
290 	hose = pci_bus_to_host(bus);
291 	if (hose == NULL)
292 		return PCIBIOS_DEVICE_NOT_FOUND;
293 	if (offset >= 0x100)
294 		return  PCIBIOS_BAD_REGISTER_NUMBER;
295 	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap);
296 	if (!addr)
297 		return PCIBIOS_DEVICE_NOT_FOUND;
298 
299 	switch (u3_ht_skip_device(hose, bus, devfn)) {
300 	case 0:
301 		break;
302 	case 1:
303 		switch (len) {
304 		case 1:
305 			*val = 0xff; break;
306 		case 2:
307 			*val = 0xffff; break;
308 		default:
309 			*val = 0xfffffffful; break;
310 		}
311 		return PCIBIOS_SUCCESSFUL;
312 	default:
313 		return PCIBIOS_DEVICE_NOT_FOUND;
314 	}
315 
316 	/*
317 	 * Note: the caller has already checked that offset is
318 	 * suitably aligned and that len is 1, 2 or 4.
319 	 */
320 	switch (len) {
321 	case 1:
322 		*val = in_8(addr);
323 		break;
324 	case 2:
325 		*val = swap ? in_le16(addr) : in_be16(addr);
326 		break;
327 	default:
328 		*val = swap ? in_le32(addr) : in_be32(addr);
329 		break;
330 	}
331 	return PCIBIOS_SUCCESSFUL;
332 }
333 
u3_ht_write_config(struct pci_bus * bus,unsigned int devfn,int offset,int len,u32 val)334 static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
335 				     int offset, int len, u32 val)
336 {
337 	struct pci_controller *hose;
338 	void __iomem *addr;
339 	int swap;
340 
341 	hose = pci_bus_to_host(bus);
342 	if (hose == NULL)
343 		return PCIBIOS_DEVICE_NOT_FOUND;
344 	if (offset >= 0x100)
345 		return  PCIBIOS_BAD_REGISTER_NUMBER;
346 	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap);
347 	if (!addr)
348 		return PCIBIOS_DEVICE_NOT_FOUND;
349 
350 	switch (u3_ht_skip_device(hose, bus, devfn)) {
351 	case 0:
352 		break;
353 	case 1:
354 		return PCIBIOS_SUCCESSFUL;
355 	default:
356 		return PCIBIOS_DEVICE_NOT_FOUND;
357 	}
358 
359 	/*
360 	 * Note: the caller has already checked that offset is
361 	 * suitably aligned and that len is 1, 2 or 4.
362 	 */
363 	switch (len) {
364 	case 1:
365 		out_8(addr, val);
366 		break;
367 	case 2:
368 		swap ? out_le16(addr, val) : out_be16(addr, val);
369 		break;
370 	default:
371 		swap ? out_le32(addr, val) : out_be32(addr, val);
372 		break;
373 	}
374 	return PCIBIOS_SUCCESSFUL;
375 }
376 
377 static struct pci_ops u3_ht_pci_ops =
378 {
379 	.read = u3_ht_read_config,
380 	.write = u3_ht_write_config,
381 };
382 
383 #define U4_PCIE_CFA0(devfn, off)	\
384 	((1 << ((unsigned int)PCI_SLOT(dev_fn)))	\
385 	 | (((unsigned int)PCI_FUNC(dev_fn)) << 8)	\
386 	 | ((((unsigned int)(off)) >> 8) << 28) \
387 	 | (((unsigned int)(off)) & 0xfcU))
388 
389 #define U4_PCIE_CFA1(bus, devfn, off)	\
390 	((((unsigned int)(bus)) << 16) \
391 	 |(((unsigned int)(devfn)) << 8)	\
392 	 | ((((unsigned int)(off)) >> 8) << 28) \
393 	 |(((unsigned int)(off)) & 0xfcU)	\
394 	 |1UL)
395 
u4_pcie_cfg_map_bus(struct pci_bus * bus,unsigned int dev_fn,int offset)396 static void __iomem *u4_pcie_cfg_map_bus(struct pci_bus *bus,
397 					 unsigned int dev_fn,
398 					 int offset)
399 {
400 	struct pci_controller *hose;
401 	unsigned int caddr;
402 
403 	if (offset >= 0x1000)
404 		return NULL;
405 
406 	hose = pci_bus_to_host(bus);
407 	if (!hose)
408 		return NULL;
409 
410 	if (bus->number == hose->first_busno) {
411 		caddr = U4_PCIE_CFA0(dev_fn, offset);
412 	} else
413 		caddr = U4_PCIE_CFA1(bus->number, dev_fn, offset);
414 
415 	/* Uninorth will return garbage if we don't read back the value ! */
416 	do {
417 		out_le32(hose->cfg_addr, caddr);
418 	} while (in_le32(hose->cfg_addr) != caddr);
419 
420 	offset &= 0x03;
421 	return hose->cfg_data + offset;
422 }
423 
424 static struct pci_ops u4_pcie_pci_ops =
425 {
426 	.map_bus = u4_pcie_cfg_map_bus,
427 	.read = pci_generic_config_read,
428 	.write = pci_generic_config_write,
429 };
430 
pmac_pci_fixup_u4_of_node(struct pci_dev * dev)431 static void pmac_pci_fixup_u4_of_node(struct pci_dev *dev)
432 {
433 	/* Apple's device-tree "hides" the root complex virtual P2P bridge
434 	 * on U4. However, Linux sees it, causing the PCI <-> OF matching
435 	 * code to fail to properly match devices below it. This works around
436 	 * it by setting the node of the bridge to point to the PHB node,
437 	 * which is not entirely correct but fixes the matching code and
438 	 * doesn't break anything else. It's also the simplest possible fix.
439 	 */
440 	if (dev->dev.of_node == NULL)
441 		dev->dev.of_node = pcibios_get_phb_of_node(dev->bus);
442 }
443 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, 0x5b, pmac_pci_fixup_u4_of_node);
444 
445 #endif /* CONFIG_PPC64 */
446 
447 #ifdef CONFIG_PPC32
448 /*
449  * For a bandit bridge, turn on cache coherency if necessary.
450  * N.B. we could clean this up using the hose ops directly.
451  */
init_bandit(struct pci_controller * bp)452 static void __init init_bandit(struct pci_controller *bp)
453 {
454 	unsigned int vendev, magic;
455 	int rev;
456 
457 	/* read the word at offset 0 in config space for device 11 */
458 	out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + PCI_VENDOR_ID);
459 	udelay(2);
460 	vendev = in_le32(bp->cfg_data);
461 	if (vendev == (PCI_DEVICE_ID_APPLE_BANDIT << 16) +
462 			PCI_VENDOR_ID_APPLE) {
463 		/* read the revision id */
464 		out_le32(bp->cfg_addr,
465 			 (1UL << BANDIT_DEVNUM) + PCI_REVISION_ID);
466 		udelay(2);
467 		rev = in_8(bp->cfg_data);
468 		if (rev != BANDIT_REVID)
469 			printk(KERN_WARNING
470 			       "Unknown revision %d for bandit\n", rev);
471 	} else if (vendev != (BANDIT_DEVID_2 << 16) + PCI_VENDOR_ID_APPLE) {
472 		printk(KERN_WARNING "bandit isn't? (%x)\n", vendev);
473 		return;
474 	}
475 
476 	/* read the word at offset 0x50 */
477 	out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + BANDIT_MAGIC);
478 	udelay(2);
479 	magic = in_le32(bp->cfg_data);
480 	if ((magic & BANDIT_COHERENT) != 0)
481 		return;
482 	magic |= BANDIT_COHERENT;
483 	udelay(2);
484 	out_le32(bp->cfg_data, magic);
485 	printk(KERN_INFO "Cache coherency enabled for bandit/PSX\n");
486 }
487 
488 /*
489  * Tweak the PCI-PCI bridge chip on the blue & white G3s.
490  */
init_p2pbridge(void)491 static void __init init_p2pbridge(void)
492 {
493 	struct device_node *p2pbridge;
494 	struct pci_controller* hose;
495 	u8 bus, devfn;
496 	u16 val;
497 
498 	/* XXX it would be better here to identify the specific
499 	   PCI-PCI bridge chip we have. */
500 	p2pbridge = of_find_node_by_name(NULL, "pci-bridge");
501 	if (p2pbridge == NULL || !of_node_name_eq(p2pbridge->parent, "pci"))
502 		goto done;
503 	if (pci_device_from_OF_node(p2pbridge, &bus, &devfn) < 0) {
504 		DBG("Can't find PCI infos for PCI<->PCI bridge\n");
505 		goto done;
506 	}
507 	/* Warning: At this point, we have not yet renumbered all busses.
508 	 * So we must use OF walking to find out hose
509 	 */
510 	hose = pci_find_hose_for_OF_device(p2pbridge);
511 	if (!hose) {
512 		DBG("Can't find hose for PCI<->PCI bridge\n");
513 		goto done;
514 	}
515 	if (early_read_config_word(hose, bus, devfn,
516 				   PCI_BRIDGE_CONTROL, &val) < 0) {
517 		printk(KERN_ERR "init_p2pbridge: couldn't read bridge"
518 		       " control\n");
519 		goto done;
520 	}
521 	val &= ~PCI_BRIDGE_CTL_MASTER_ABORT;
522 	early_write_config_word(hose, bus, devfn, PCI_BRIDGE_CONTROL, val);
523 done:
524 	of_node_put(p2pbridge);
525 }
526 
init_second_ohare(void)527 static void __init init_second_ohare(void)
528 {
529 	struct device_node *np = of_find_node_by_name(NULL, "pci106b,7");
530 	unsigned char bus, devfn;
531 	unsigned short cmd;
532 
533 	if (np == NULL)
534 		return;
535 
536 	/* This must run before we initialize the PICs since the second
537 	 * ohare hosts a PIC that will be accessed there.
538 	 */
539 	if (pci_device_from_OF_node(np, &bus, &devfn) == 0) {
540 		struct pci_controller* hose =
541 			pci_find_hose_for_OF_device(np);
542 		if (!hose) {
543 			printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
544 			of_node_put(np);
545 			return;
546 		}
547 		early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
548 		cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
549 		cmd &= ~PCI_COMMAND_IO;
550 		early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
551 	}
552 	has_second_ohare = 1;
553 	of_node_put(np);
554 }
555 
556 /*
557  * Some Apple desktop machines have a NEC PD720100A USB2 controller
558  * on the motherboard. Open Firmware, on these, will disable the
559  * EHCI part of it so it behaves like a pair of OHCI's. This fixup
560  * code re-enables it ;)
561  */
fixup_nec_usb2(void)562 static void __init fixup_nec_usb2(void)
563 {
564 	struct device_node *nec;
565 
566 	for_each_node_by_name(nec, "usb") {
567 		struct pci_controller *hose;
568 		u32 data;
569 		const u32 *prop;
570 		u8 bus, devfn;
571 
572 		prop = of_get_property(nec, "vendor-id", NULL);
573 		if (prop == NULL)
574 			continue;
575 		if (0x1033 != *prop)
576 			continue;
577 		prop = of_get_property(nec, "device-id", NULL);
578 		if (prop == NULL)
579 			continue;
580 		if (0x0035 != *prop)
581 			continue;
582 		prop = of_get_property(nec, "reg", NULL);
583 		if (prop == NULL)
584 			continue;
585 		devfn = (prop[0] >> 8) & 0xff;
586 		bus = (prop[0] >> 16) & 0xff;
587 		if (PCI_FUNC(devfn) != 0)
588 			continue;
589 		hose = pci_find_hose_for_OF_device(nec);
590 		if (!hose)
591 			continue;
592 		early_read_config_dword(hose, bus, devfn, 0xe4, &data);
593 		if (data & 1UL) {
594 			printk("Found NEC PD720100A USB2 chip with disabled"
595 			       " EHCI, fixing up...\n");
596 			data &= ~1UL;
597 			early_write_config_dword(hose, bus, devfn, 0xe4, data);
598 		}
599 	}
600 }
601 
setup_bandit(struct pci_controller * hose,struct resource * addr)602 static void __init setup_bandit(struct pci_controller *hose,
603 				struct resource *addr)
604 {
605 	hose->ops = &macrisc_pci_ops;
606 	hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
607 	hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
608 	init_bandit(hose);
609 }
610 
setup_uninorth(struct pci_controller * hose,struct resource * addr)611 static int __init setup_uninorth(struct pci_controller *hose,
612 				 struct resource *addr)
613 {
614 	pci_add_flags(PCI_REASSIGN_ALL_BUS);
615 	has_uninorth = 1;
616 	hose->ops = &macrisc_pci_ops;
617 	hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
618 	hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
619 	/* We "know" that the bridge at f2000000 has the PCI slots. */
620 	return addr->start == 0xf2000000;
621 }
622 #endif /* CONFIG_PPC32 */
623 
624 #ifdef CONFIG_PPC64
setup_u3_agp(struct pci_controller * hose)625 static void __init setup_u3_agp(struct pci_controller* hose)
626 {
627 	/* On G5, we move AGP up to high bus number so we don't need
628 	 * to reassign bus numbers for HT. If we ever have P2P bridges
629 	 * on AGP, we'll have to move pci_assign_all_busses to the
630 	 * pci_controller structure so we enable it for AGP and not for
631 	 * HT childs.
632 	 * We hard code the address because of the different size of
633 	 * the reg address cell, we shall fix that by killing struct
634 	 * reg_property and using some accessor functions instead
635 	 */
636 	hose->first_busno = 0xf0;
637 	hose->last_busno = 0xff;
638 	has_uninorth = 1;
639 	hose->ops = &macrisc_pci_ops;
640 	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
641 	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
642 	u3_agp = hose;
643 }
644 
setup_u4_pcie(struct pci_controller * hose)645 static void __init setup_u4_pcie(struct pci_controller* hose)
646 {
647 	/* We currently only implement the "non-atomic" config space, to
648 	 * be optimised later.
649 	 */
650 	hose->ops = &u4_pcie_pci_ops;
651 	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
652 	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
653 
654 	/* The bus contains a bridge from root -> device, we need to
655 	 * make it visible on bus 0 so that we pick the right type
656 	 * of config cycles. If we didn't, we would have to force all
657 	 * config cycles to be type 1. So we override the "bus-range"
658 	 * property here
659 	 */
660 	hose->first_busno = 0x00;
661 	hose->last_busno = 0xff;
662 }
663 
parse_region_decode(struct pci_controller * hose,u32 decode)664 static void __init parse_region_decode(struct pci_controller *hose,
665 				       u32 decode)
666 {
667 	unsigned long base, end, next = -1;
668 	int i, cur = -1;
669 
670 	/* Iterate through all bits. We ignore the last bit as this region is
671 	 * reserved for the ROM among other niceties
672 	 */
673 	for (i = 0; i < 31; i++) {
674 		if ((decode & (0x80000000 >> i)) == 0)
675 			continue;
676 		if (i < 16) {
677 			base = 0xf0000000 | (((u32)i) << 24);
678 			end = base + 0x00ffffff;
679 		} else {
680 			base = ((u32)i-16) << 28;
681 			end = base + 0x0fffffff;
682 		}
683 		if (base != next) {
684 			if (++cur >= 3) {
685 				printk(KERN_WARNING "PCI: Too many ranges !\n");
686 				break;
687 			}
688 			hose->mem_resources[cur].flags = IORESOURCE_MEM;
689 			hose->mem_resources[cur].name = hose->dn->full_name;
690 			hose->mem_resources[cur].start = base;
691 			hose->mem_resources[cur].end = end;
692 			hose->mem_offset[cur] = 0;
693 			DBG("  %d: 0x%08lx-0x%08lx\n", cur, base, end);
694 		} else {
695 			DBG("   :           -0x%08lx\n", end);
696 			hose->mem_resources[cur].end = end;
697 		}
698 		next = end + 1;
699 	}
700 }
701 
setup_u3_ht(struct pci_controller * hose)702 static void __init setup_u3_ht(struct pci_controller* hose)
703 {
704 	struct device_node *np = hose->dn;
705 	struct resource cfg_res, self_res;
706 	u32 decode;
707 
708 	hose->ops = &u3_ht_pci_ops;
709 
710 	/* Get base addresses from OF tree
711 	 */
712 	if (of_address_to_resource(np, 0, &cfg_res) ||
713 	    of_address_to_resource(np, 1, &self_res)) {
714 		printk(KERN_ERR "PCI: Failed to get U3/U4 HT resources !\n");
715 		return;
716 	}
717 
718 	/* Map external cfg space access into cfg_data and self registers
719 	 * into cfg_addr
720 	 */
721 	hose->cfg_data = ioremap(cfg_res.start, 0x02000000);
722 	hose->cfg_addr = ioremap(self_res.start, resource_size(&self_res));
723 
724 	/*
725 	 * /ht node doesn't expose a "ranges" property, we read the register
726 	 * that controls the decoding logic and use that for memory regions.
727 	 * The IO region is hard coded since it is fixed in HW as well.
728 	 */
729 	hose->io_base_phys = 0xf4000000;
730 	hose->pci_io_size = 0x00400000;
731 	hose->io_resource.name = np->full_name;
732 	hose->io_resource.start = 0;
733 	hose->io_resource.end = 0x003fffff;
734 	hose->io_resource.flags = IORESOURCE_IO;
735 	hose->first_busno = 0;
736 	hose->last_busno = 0xef;
737 
738 	/* Note: fix offset when cfg_addr becomes a void * */
739 	decode = in_be32(hose->cfg_addr + 0x80);
740 
741 	DBG("PCI: Apple HT bridge decode register: 0x%08x\n", decode);
742 
743 	/* NOTE: The decode register setup is a bit weird... region
744 	 * 0xf8000000 for example is marked as enabled in there while it's
745 	 & actually the memory controller registers.
746 	 * That means that we are incorrectly attributing it to HT.
747 	 *
748 	 * In a similar vein, region 0xf4000000 is actually the HT IO space but
749 	 * also marked as enabled in here and 0xf9000000 is used by some other
750 	 * internal bits of the northbridge.
751 	 *
752 	 * Unfortunately, we can't just mask out those bit as we would end
753 	 * up with more regions than we can cope (linux can only cope with
754 	 * 3 memory regions for a PHB at this stage).
755 	 *
756 	 * So for now, we just do a little hack. We happen to -know- that
757 	 * Apple firmware doesn't assign things below 0xfa000000 for that
758 	 * bridge anyway so we mask out all bits we don't want.
759 	 */
760 	decode &= 0x003fffff;
761 
762 	/* Now parse the resulting bits and build resources */
763 	parse_region_decode(hose, decode);
764 }
765 #endif /* CONFIG_PPC64 */
766 
767 /*
768  * We assume that if we have a G3 powermac, we have one bridge called
769  * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
770  * if we have one or more bandit or chaos bridges, we don't have a MPC106.
771  */
pmac_add_bridge(struct device_node * dev)772 static int __init pmac_add_bridge(struct device_node *dev)
773 {
774 	int len;
775 	struct pci_controller *hose;
776 	struct resource rsrc;
777 	char *disp_name;
778 	const int *bus_range;
779 	int primary = 1;
780 
781 	DBG("Adding PCI host bridge %pOF\n", dev);
782 
783 	/* Fetch host bridge registers address */
784 	of_address_to_resource(dev, 0, &rsrc);
785 
786 	/* Get bus range if any */
787 	bus_range = of_get_property(dev, "bus-range", &len);
788 	if (bus_range == NULL || len < 2 * sizeof(int)) {
789 		printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
790 		       " bus 0\n", dev);
791 	}
792 
793 	hose = pcibios_alloc_controller(dev);
794 	if (!hose)
795 		return -ENOMEM;
796 	hose->first_busno = bus_range ? bus_range[0] : 0;
797 	hose->last_busno = bus_range ? bus_range[1] : 0xff;
798 	hose->controller_ops = pmac_pci_controller_ops;
799 
800 	disp_name = NULL;
801 
802 	/* 64 bits only bridges */
803 #ifdef CONFIG_PPC64
804 	if (of_device_is_compatible(dev, "u3-agp")) {
805 		setup_u3_agp(hose);
806 		disp_name = "U3-AGP";
807 		primary = 0;
808 	} else if (of_device_is_compatible(dev, "u3-ht")) {
809 		setup_u3_ht(hose);
810 		disp_name = "U3-HT";
811 		primary = 1;
812 	} else if (of_device_is_compatible(dev, "u4-pcie")) {
813 		setup_u4_pcie(hose);
814 		disp_name = "U4-PCIE";
815 		primary = 0;
816 	}
817 	printk(KERN_INFO "Found %s PCI host bridge.  Firmware bus number:"
818 	       " %d->%d\n", disp_name, hose->first_busno, hose->last_busno);
819 #endif /* CONFIG_PPC64 */
820 
821 	/* 32 bits only bridges */
822 #ifdef CONFIG_PPC32
823 	if (of_device_is_compatible(dev, "uni-north")) {
824 		primary = setup_uninorth(hose, &rsrc);
825 		disp_name = "UniNorth";
826 	} else if (of_node_name_eq(dev, "pci")) {
827 		/* XXX assume this is a mpc106 (grackle) */
828 		setup_grackle(hose);
829 		disp_name = "Grackle (MPC106)";
830 	} else if (of_node_name_eq(dev, "bandit")) {
831 		setup_bandit(hose, &rsrc);
832 		disp_name = "Bandit";
833 	} else if (of_node_name_eq(dev, "chaos")) {
834 		setup_chaos(hose, &rsrc);
835 		disp_name = "Chaos";
836 		primary = 0;
837 	}
838 	printk(KERN_INFO "Found %s PCI host bridge at 0x%016llx. "
839 	       "Firmware bus number: %d->%d\n",
840 		disp_name, (unsigned long long)rsrc.start, hose->first_busno,
841 		hose->last_busno);
842 #endif /* CONFIG_PPC32 */
843 
844 	DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
845 		hose, hose->cfg_addr, hose->cfg_data);
846 
847 	/* Interpret the "ranges" property */
848 	/* This also maps the I/O region and sets isa_io/mem_base */
849 	pci_process_bridge_OF_ranges(hose, dev, primary);
850 
851 	/* Fixup "bus-range" OF property */
852 	fixup_bus_range(dev);
853 
854 	/* create pci_dn's for DT nodes under this PHB */
855 	if (IS_ENABLED(CONFIG_PPC64))
856 		pci_devs_phb_init_dynamic(hose);
857 
858 	return 0;
859 }
860 
pmac_pci_irq_fixup(struct pci_dev * dev)861 void pmac_pci_irq_fixup(struct pci_dev *dev)
862 {
863 #ifdef CONFIG_PPC32
864 	/* Fixup interrupt for the modem/ethernet combo controller.
865 	 * on machines with a second ohare chip.
866 	 * The number in the device tree (27) is bogus (correct for
867 	 * the ethernet-only board but not the combo ethernet/modem
868 	 * board). The real interrupt is 28 on the second controller
869 	 * -> 28+32 = 60.
870 	 */
871 	if (has_second_ohare &&
872 	    dev->vendor == PCI_VENDOR_ID_DEC &&
873 	    dev->device == PCI_DEVICE_ID_DEC_TULIP_PLUS) {
874 		dev->irq = irq_create_mapping(NULL, 60);
875 		irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
876 	}
877 #endif /* CONFIG_PPC32 */
878 }
879 
880 #ifdef CONFIG_PPC64
pmac_pci_root_bridge_prepare(struct pci_host_bridge * bridge)881 static int pmac_pci_root_bridge_prepare(struct pci_host_bridge *bridge)
882 {
883 	struct pci_controller *hose = pci_bus_to_host(bridge->bus);
884 	struct device_node *np, *child;
885 
886 	if (hose != u3_agp)
887 		return 0;
888 
889 	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
890 	 * assume there is no P2P bridge on the AGP bus, which should be a
891 	 * safe assumptions for now. We should do something better in the
892 	 * future though
893 	 */
894 	np = hose->dn;
895 	PCI_DN(np)->busno = 0xf0;
896 	for_each_child_of_node(np, child)
897 		PCI_DN(child)->busno = 0xf0;
898 
899 	return 0;
900 }
901 #endif /* CONFIG_PPC64 */
902 
pmac_pci_init(void)903 void __init pmac_pci_init(void)
904 {
905 	struct device_node *np, *root;
906 	struct device_node *ht __maybe_unused = NULL;
907 
908 	pci_set_flags(PCI_CAN_SKIP_ISA_ALIGN);
909 
910 	root = of_find_node_by_path("/");
911 	if (root == NULL) {
912 		printk(KERN_CRIT "pmac_pci_init: can't find root "
913 		       "of device tree\n");
914 		return;
915 	}
916 	for_each_child_of_node(root, np) {
917 		if (of_node_name_eq(np, "bandit")
918 		    || of_node_name_eq(np, "chaos")
919 		    || of_node_name_eq(np, "pci")) {
920 			if (pmac_add_bridge(np) == 0)
921 				of_node_get(np);
922 		}
923 		if (of_node_name_eq(np, "ht")) {
924 			of_node_get(np);
925 			ht = np;
926 		}
927 	}
928 	of_node_put(root);
929 
930 #ifdef CONFIG_PPC64
931 	/* Probe HT last as it relies on the agp resources to be already
932 	 * setup
933 	 */
934 	if (ht && pmac_add_bridge(ht) != 0)
935 		of_node_put(ht);
936 
937 	ppc_md.pcibios_root_bridge_prepare = pmac_pci_root_bridge_prepare;
938 	/* pmac_check_ht_link(); */
939 
940 #else /* CONFIG_PPC64 */
941 	init_p2pbridge();
942 	init_second_ohare();
943 	fixup_nec_usb2();
944 
945 	/* We are still having some issues with the Xserve G4, enabling
946 	 * some offset between bus number and domains for now when we
947 	 * assign all busses should help for now
948 	 */
949 	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
950 		pcibios_assign_bus_offset = 0x10;
951 #endif
952 }
953 
954 #ifdef CONFIG_PPC32
pmac_pci_enable_device_hook(struct pci_dev * dev)955 static bool pmac_pci_enable_device_hook(struct pci_dev *dev)
956 {
957 	struct device_node* node;
958 	int updatecfg = 0;
959 	int uninorth_child;
960 
961 	node = pci_device_to_OF_node(dev);
962 
963 	/* We don't want to enable USB controllers absent from the OF tree
964 	 * (iBook second controller)
965 	 */
966 	if (dev->vendor == PCI_VENDOR_ID_APPLE
967 	    && dev->class == PCI_CLASS_SERIAL_USB_OHCI
968 	    && !node) {
969 		printk(KERN_INFO "Apple USB OHCI %s disabled by firmware\n",
970 		       pci_name(dev));
971 		return false;
972 	}
973 
974 	if (!node)
975 		return true;
976 
977 	uninorth_child = node->parent &&
978 		of_device_is_compatible(node->parent, "uni-north");
979 
980 	/* Firewire & GMAC were disabled after PCI probe, the driver is
981 	 * claiming them, we must re-enable them now.
982 	 */
983 	if (uninorth_child && of_node_name_eq(node, "firewire") &&
984 	    (of_device_is_compatible(node, "pci106b,18") ||
985 	     of_device_is_compatible(node, "pci106b,30") ||
986 	     of_device_is_compatible(node, "pci11c1,5811"))) {
987 		pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, node, 0, 1);
988 		pmac_call_feature(PMAC_FTR_1394_ENABLE, node, 0, 1);
989 		updatecfg = 1;
990 	}
991 	if (uninorth_child && of_node_name_eq(node, "ethernet") &&
992 	    of_device_is_compatible(node, "gmac")) {
993 		pmac_call_feature(PMAC_FTR_GMAC_ENABLE, node, 0, 1);
994 		updatecfg = 1;
995 	}
996 
997 	/*
998 	 * Fixup various header fields on 32 bits. We don't do that on
999 	 * 64 bits as some of these have strange values behind the HT
1000 	 * bridge and we must not, for example, enable MWI or set the
1001 	 * cache line size on them.
1002 	 */
1003 	if (updatecfg) {
1004 		u16 cmd;
1005 
1006 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
1007 		cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER
1008 			| PCI_COMMAND_INVALIDATE;
1009 		pci_write_config_word(dev, PCI_COMMAND, cmd);
1010 		pci_write_config_byte(dev, PCI_LATENCY_TIMER, 16);
1011 
1012 		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1013 				      L1_CACHE_BYTES >> 2);
1014 	}
1015 
1016 	return true;
1017 }
1018 
pmac_pci_fixup_ohci(struct pci_dev * dev)1019 static void pmac_pci_fixup_ohci(struct pci_dev *dev)
1020 {
1021 	struct device_node *node = pci_device_to_OF_node(dev);
1022 
1023 	/* We don't want to assign resources to USB controllers
1024 	 * absent from the OF tree (iBook second controller)
1025 	 */
1026 	if (dev->class == PCI_CLASS_SERIAL_USB_OHCI && !node)
1027 		dev->resource[0].flags = 0;
1028 }
1029 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_ANY_ID, pmac_pci_fixup_ohci);
1030 
1031 /* We power down some devices after they have been probed. They'll
1032  * be powered back on later on
1033  */
pmac_pcibios_after_init(void)1034 void __init pmac_pcibios_after_init(void)
1035 {
1036 	struct device_node* nd;
1037 
1038 	for_each_node_by_name(nd, "firewire") {
1039 		if (nd->parent && (of_device_is_compatible(nd, "pci106b,18") ||
1040 				   of_device_is_compatible(nd, "pci106b,30") ||
1041 				   of_device_is_compatible(nd, "pci11c1,5811"))
1042 		    && of_device_is_compatible(nd->parent, "uni-north")) {
1043 			pmac_call_feature(PMAC_FTR_1394_ENABLE, nd, 0, 0);
1044 			pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, nd, 0, 0);
1045 		}
1046 	}
1047 	for_each_node_by_name(nd, "ethernet") {
1048 		if (nd->parent && of_device_is_compatible(nd, "gmac")
1049 		    && of_device_is_compatible(nd->parent, "uni-north"))
1050 			pmac_call_feature(PMAC_FTR_GMAC_ENABLE, nd, 0, 0);
1051 	}
1052 }
1053 
pmac_pci_fixup_cardbus(struct pci_dev * dev)1054 static void pmac_pci_fixup_cardbus(struct pci_dev *dev)
1055 {
1056 	if (!machine_is(powermac))
1057 		return;
1058 	/*
1059 	 * Fix the interrupt routing on the various cardbus bridges
1060 	 * used on powerbooks
1061 	 */
1062 	if (dev->vendor != PCI_VENDOR_ID_TI)
1063 		return;
1064 	if (dev->device == PCI_DEVICE_ID_TI_1130 ||
1065 	    dev->device == PCI_DEVICE_ID_TI_1131) {
1066 		u8 val;
1067 		/* Enable PCI interrupt */
1068 		if (pci_read_config_byte(dev, 0x91, &val) == 0)
1069 			pci_write_config_byte(dev, 0x91, val | 0x30);
1070 		/* Disable ISA interrupt mode */
1071 		if (pci_read_config_byte(dev, 0x92, &val) == 0)
1072 			pci_write_config_byte(dev, 0x92, val & ~0x06);
1073 	}
1074 	if (dev->device == PCI_DEVICE_ID_TI_1210 ||
1075 	    dev->device == PCI_DEVICE_ID_TI_1211 ||
1076 	    dev->device == PCI_DEVICE_ID_TI_1410 ||
1077 	    dev->device == PCI_DEVICE_ID_TI_1510) {
1078 		u8 val;
1079 		/* 0x8c == TI122X_IRQMUX, 2 says to route the INTA
1080 		   signal out the MFUNC0 pin */
1081 		if (pci_read_config_byte(dev, 0x8c, &val) == 0)
1082 			pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2);
1083 		/* Disable ISA interrupt mode */
1084 		if (pci_read_config_byte(dev, 0x92, &val) == 0)
1085 			pci_write_config_byte(dev, 0x92, val & ~0x06);
1086 	}
1087 }
1088 
1089 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_ANY_ID, pmac_pci_fixup_cardbus);
1090 
pmac_pci_fixup_pciata(struct pci_dev * dev)1091 static void pmac_pci_fixup_pciata(struct pci_dev *dev)
1092 {
1093        u8 progif = 0;
1094 
1095        /*
1096         * On PowerMacs, we try to switch any PCI ATA controller to
1097 	* fully native mode
1098         */
1099 	if (!machine_is(powermac))
1100 		return;
1101 
1102 	/* Some controllers don't have the class IDE */
1103 	if (dev->vendor == PCI_VENDOR_ID_PROMISE)
1104 		switch(dev->device) {
1105 		case PCI_DEVICE_ID_PROMISE_20246:
1106 		case PCI_DEVICE_ID_PROMISE_20262:
1107 		case PCI_DEVICE_ID_PROMISE_20263:
1108 		case PCI_DEVICE_ID_PROMISE_20265:
1109 		case PCI_DEVICE_ID_PROMISE_20267:
1110 		case PCI_DEVICE_ID_PROMISE_20268:
1111 		case PCI_DEVICE_ID_PROMISE_20269:
1112 		case PCI_DEVICE_ID_PROMISE_20270:
1113 		case PCI_DEVICE_ID_PROMISE_20271:
1114 		case PCI_DEVICE_ID_PROMISE_20275:
1115 		case PCI_DEVICE_ID_PROMISE_20276:
1116 		case PCI_DEVICE_ID_PROMISE_20277:
1117 			goto good;
1118 		}
1119 	/* Others, check PCI class */
1120 	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
1121 		return;
1122  good:
1123 	pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1124 	if ((progif & 5) != 5) {
1125 		printk(KERN_INFO "PCI: %s Forcing PCI IDE into native mode\n",
1126 		       pci_name(dev));
1127 		(void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
1128 		if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
1129 		    (progif & 5) != 5)
1130 			printk(KERN_ERR "Rewrite of PROGIF failed !\n");
1131 		else {
1132 			/* Clear IO BARs, they will be reassigned */
1133 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
1134 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
1135 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, 0);
1136 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_3, 0);
1137 		}
1138 	}
1139 }
1140 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pmac_pci_fixup_pciata);
1141 #endif /* CONFIG_PPC32 */
1142 
1143 /*
1144  * Disable second function on K2-SATA, it's broken
1145  * and disable IO BARs on first one
1146  */
fixup_k2_sata(struct pci_dev * dev)1147 static void fixup_k2_sata(struct pci_dev* dev)
1148 {
1149 	int i;
1150 	u16 cmd;
1151 
1152 	if (PCI_FUNC(dev->devfn) > 0) {
1153 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
1154 		cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
1155 		pci_write_config_word(dev, PCI_COMMAND, cmd);
1156 		for (i = 0; i < 6; i++) {
1157 			dev->resource[i].start = dev->resource[i].end = 0;
1158 			dev->resource[i].flags = 0;
1159 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i,
1160 					       0);
1161 		}
1162 	} else {
1163 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
1164 		cmd &= ~PCI_COMMAND_IO;
1165 		pci_write_config_word(dev, PCI_COMMAND, cmd);
1166 		for (i = 0; i < 5; i++) {
1167 			dev->resource[i].start = dev->resource[i].end = 0;
1168 			dev->resource[i].flags = 0;
1169 			pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i,
1170 					       0);
1171 		}
1172 	}
1173 }
1174 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);
1175 
1176 /*
1177  * On U4 (aka CPC945) the PCIe root complex "P2P" bridge resource ranges aren't
1178  * configured by the firmware. The bridge itself seems to ignore them but it
1179  * causes problems with Linux which then re-assigns devices below the bridge,
1180  * thus changing addresses of those devices from what was in the device-tree,
1181  * which sucks when those are video cards using offb
1182  *
1183  * We could just mark it transparent but I prefer fixing up the resources to
1184  * properly show what's going on here, as I have some doubts about having them
1185  * badly configured potentially being an issue for DMA.
1186  *
1187  * We leave PIO alone, it seems to be fine
1188  *
1189  * Oh and there's another funny bug. The OF properties advertize the region
1190  * 0xf1000000..0xf1ffffff as being forwarded as memory space. But that's
1191  * actually not true, this region is the memory mapped config space. So we
1192  * also need to filter it out or we'll map things in the wrong place.
1193  */
fixup_u4_pcie(struct pci_dev * dev)1194 static void fixup_u4_pcie(struct pci_dev* dev)
1195 {
1196 	struct pci_controller *host = pci_bus_to_host(dev->bus);
1197 	struct resource *region = NULL;
1198 	u32 reg;
1199 	int i;
1200 
1201 	/* Only do that on PowerMac */
1202 	if (!machine_is(powermac))
1203 		return;
1204 
1205 	/* Find the largest MMIO region */
1206 	for (i = 0; i < 3; i++) {
1207 		struct resource *r = &host->mem_resources[i];
1208 		if (!(r->flags & IORESOURCE_MEM))
1209 			continue;
1210 		/* Skip the 0xf0xxxxxx..f2xxxxxx regions, we know they
1211 		 * are reserved by HW for other things
1212 		 */
1213 		if (r->start >= 0xf0000000 && r->start < 0xf3000000)
1214 			continue;
1215 		if (!region || resource_size(r) > resource_size(region))
1216 			region = r;
1217 	}
1218 	/* Nothing found, bail */
1219 	if (!region)
1220 		return;
1221 
1222 	/* Print things out */
1223 	printk(KERN_INFO "PCI: Fixup U4 PCIe bridge range: %pR\n", region);
1224 
1225 	/* Fixup bridge config space. We know it's a Mac, resource aren't
1226 	 * offset so let's just blast them as-is. We also know that they
1227 	 * fit in 32 bits
1228 	 */
1229 	reg = ((region->start >> 16) & 0xfff0) | (region->end & 0xfff00000);
1230 	pci_write_config_dword(dev, PCI_MEMORY_BASE, reg);
1231 	pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0);
1232 	pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
1233 	pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0);
1234 }
1235 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_U4_PCIE, fixup_u4_pcie);
1236 
1237 #ifdef CONFIG_PPC64
pmac_pci_probe_mode(struct pci_bus * bus)1238 static int pmac_pci_probe_mode(struct pci_bus *bus)
1239 {
1240 	struct device_node *node = pci_bus_to_OF_node(bus);
1241 
1242 	/* We need to use normal PCI probing for the AGP bus,
1243 	 * since the device for the AGP bridge isn't in the tree.
1244 	 * Same for the PCIe host on U4 and the HT host bridge.
1245 	 */
1246 	if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
1247 				  of_device_is_compatible(node, "u4-pcie") ||
1248 				  of_device_is_compatible(node, "u3-ht")))
1249 		return PCI_PROBE_NORMAL;
1250 	return PCI_PROBE_DEVTREE;
1251 }
1252 #endif /* CONFIG_PPC64 */
1253 
1254 struct pci_controller_ops pmac_pci_controller_ops = {
1255 #ifdef CONFIG_PPC64
1256 	.probe_mode		= pmac_pci_probe_mode,
1257 #endif
1258 #ifdef CONFIG_PPC32
1259 	.enable_device_hook	= pmac_pci_enable_device_hook,
1260 #endif
1261 };
1262