2 * Support for PCI bridges found on Power Macintoshes.
3 * At present the "bandit" and "chaos" bridges are supported.
4 * Fortunately you access configuration space in the same
5 * way with either bridge.
7 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
8 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/delay.h>
19 #include <linux/string.h>
20 #include <linux/init.h>
21 #include <linux/bootmem.h>
23 #include <asm/sections.h>
26 #include <asm/pci-bridge.h>
27 #include <asm/machdep.h>
28 #include <asm/pmac_feature.h>
29 #include <asm/iommu.h>
37 #define DBG(x...) printk(x)
42 /* XXX Could be per-controller, but I don't think we risk anything by
43 * assuming we won't have both UniNorth and Bandit */
44 static int has_uninorth;
45 static struct pci_controller *u3_agp;
46 struct device_node *k2_skiplist[2];
48 static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
50 for (; node != 0;node = node->sibling) {
52 unsigned int *class_code;
55 /* For PCI<->PCI bridges or CardBus bridges, we go down */
56 class_code = (unsigned int *) get_property(node, "class-code", NULL);
57 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
58 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
60 bus_range = (int *) get_property(node, "bus-range", &len);
61 if (bus_range != NULL && len > 2 * sizeof(int)) {
62 if (bus_range[1] > higher)
63 higher = bus_range[1];
65 higher = fixup_one_level_bus_range(node->child, higher);
70 /* This routine fixes the "bus-range" property of all bridges in the
71 * system since they tend to have their "last" member wrong on macs
73 * Note that the bus numbers manipulated here are OF bus numbers, they
74 * are not Linux bus numbers.
76 static void __init fixup_bus_range(struct device_node *bridge)
81 /* Lookup the "bus-range" property for the hose */
82 bus_range = (int *) get_property(bridge, "bus-range", &len);
83 if (bus_range == NULL || len < 2 * sizeof(int)) {
84 printk(KERN_WARNING "Can't get bus-range for %s\n",
88 bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
92 * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
94 * The "Bandit" version is present in all early PCI PowerMacs,
95 * and up to the first ones using Grackle. Some machines may
96 * have 2 bandit controllers (2 PCI busses).
98 * "Chaos" is used in some "Bandit"-type machines as a bridge
99 * for the separate display bus. It is accessed the same
100 * way as bandit, but cannot be probed for devices. It therefore
101 * has its own config access functions.
103 * The "UniNorth" version is present in all Core99 machines
104 * (iBook, G4, new IMacs, and all the recent Apple machines).
105 * It contains 3 controllers in one ASIC.
107 * The U3 is the bridge used on G5 machines. It contains on
108 * AGP bus which is dealt with the old UniNorth access routines
109 * and an HyperTransport bus which uses its own set of access
113 #define MACRISC_CFA0(devfn, off) \
114 ((1 << (unsigned long)PCI_SLOT(dev_fn)) \
115 | (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
116 | (((unsigned long)(off)) & 0xFCUL))
118 #define MACRISC_CFA1(bus, devfn, off) \
119 ((((unsigned long)(bus)) << 16) \
120 |(((unsigned long)(devfn)) << 8) \
121 |(((unsigned long)(off)) & 0xFCUL) \
124 static unsigned long __pmac macrisc_cfg_access(struct pci_controller* hose,
125 u8 bus, u8 dev_fn, u8 offset)
129 if (bus == hose->first_busno) {
130 if (dev_fn < (11 << 3))
132 caddr = MACRISC_CFA0(dev_fn, offset);
134 caddr = MACRISC_CFA1(bus, dev_fn, offset);
136 /* Uninorth will return garbage if we don't read back the value ! */
138 out_le32(hose->cfg_addr, caddr);
139 } while (in_le32(hose->cfg_addr) != caddr);
141 offset &= has_uninorth ? 0x07 : 0x03;
142 return ((unsigned long)hose->cfg_data) + offset;
145 static int __pmac macrisc_read_config(struct pci_bus *bus, unsigned int devfn,
146 int offset, int len, u32 *val)
148 struct pci_controller *hose;
151 hose = pci_bus_to_host(bus);
153 return PCIBIOS_DEVICE_NOT_FOUND;
155 addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
157 return PCIBIOS_DEVICE_NOT_FOUND;
159 * Note: the caller has already checked that offset is
160 * suitably aligned and that len is 1, 2 or 4.
164 *val = in_8((u8 *)addr);
167 *val = in_le16((u16 *)addr);
170 *val = in_le32((u32 *)addr);
173 return PCIBIOS_SUCCESSFUL;
176 static int __pmac macrisc_write_config(struct pci_bus *bus, unsigned int devfn,
177 int offset, int len, u32 val)
179 struct pci_controller *hose;
182 hose = pci_bus_to_host(bus);
184 return PCIBIOS_DEVICE_NOT_FOUND;
186 addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
188 return PCIBIOS_DEVICE_NOT_FOUND;
190 * Note: the caller has already checked that offset is
191 * suitably aligned and that len is 1, 2 or 4.
195 out_8((u8 *)addr, val);
196 (void) in_8((u8 *)addr);
199 out_le16((u16 *)addr, val);
200 (void) in_le16((u16 *)addr);
203 out_le32((u32 *)addr, val);
204 (void) in_le32((u32 *)addr);
207 return PCIBIOS_SUCCESSFUL;
210 static struct pci_ops macrisc_pci_ops =
217 * These versions of U3 HyperTransport config space access ops do not
218 * implement self-view of the HT host yet
222 * This function deals with some "special cases" devices.
224 * 0 -> No special case
225 * 1 -> Skip the device but act as if the access was successfull
226 * (return 0xff's on reads, eventually, cache config space
227 * accesses in a later version)
228 * -1 -> Hide the device (unsuccessful acess)
230 static int u3_ht_skip_device(struct pci_controller *hose,
231 struct pci_bus *bus, unsigned int devfn)
233 struct device_node *busdn, *dn;
236 /* We only allow config cycles to devices that are in OF device-tree
237 * as we are apparently having some weird things going on with some
238 * revs of K2 on recent G5s
241 busdn = pci_device_to_OF_node(bus->self);
243 busdn = hose->arch_data;
244 for (dn = busdn->child; dn; dn = dn->sibling)
245 if (dn->devfn == devfn)
251 * When a device in K2 is powered down, we die on config
252 * cycle accesses. Fix that here.
255 if (k2_skiplist[i] == dn)
261 #define U3_HT_CFA0(devfn, off) \
262 ((((unsigned long)devfn) << 8) | offset)
263 #define U3_HT_CFA1(bus, devfn, off) \
264 (U3_HT_CFA0(devfn, off) \
265 + (((unsigned long)bus) << 16) \
268 static unsigned long __pmac u3_ht_cfg_access(struct pci_controller* hose,
269 u8 bus, u8 devfn, u8 offset)
271 if (bus == hose->first_busno) {
272 /* For now, we don't self probe U3 HT bridge */
273 if (PCI_SLOT(devfn) == 0)
275 return ((unsigned long)hose->cfg_data) + U3_HT_CFA0(devfn, offset);
277 return ((unsigned long)hose->cfg_data) + U3_HT_CFA1(bus, devfn, offset);
280 static int __pmac u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
281 int offset, int len, u32 *val)
283 struct pci_controller *hose;
287 hose = pci_bus_to_host(bus);
289 return PCIBIOS_DEVICE_NOT_FOUND;
291 addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
293 return PCIBIOS_DEVICE_NOT_FOUND;
295 switch (u3_ht_skip_device(hose, bus, devfn)) {
303 *val = 0xffff; break;
305 *val = 0xfffffffful; break;
307 return PCIBIOS_SUCCESSFUL;
309 return PCIBIOS_DEVICE_NOT_FOUND;
313 * Note: the caller has already checked that offset is
314 * suitably aligned and that len is 1, 2 or 4.
318 *val = in_8((u8 *)addr);
321 *val = in_le16((u16 *)addr);
324 *val = in_le32((u32 *)addr);
327 return PCIBIOS_SUCCESSFUL;
330 static int __pmac u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
331 int offset, int len, u32 val)
333 struct pci_controller *hose;
336 hose = pci_bus_to_host(bus);
338 return PCIBIOS_DEVICE_NOT_FOUND;
340 addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
342 return PCIBIOS_DEVICE_NOT_FOUND;
344 switch (u3_ht_skip_device(hose, bus, devfn)) {
348 return PCIBIOS_SUCCESSFUL;
350 return PCIBIOS_DEVICE_NOT_FOUND;
354 * Note: the caller has already checked that offset is
355 * suitably aligned and that len is 1, 2 or 4.
359 out_8((u8 *)addr, val);
360 (void) in_8((u8 *)addr);
363 out_le16((u16 *)addr, val);
364 (void) in_le16((u16 *)addr);
367 out_le32((u32 *)addr, val);
368 (void) in_le32((u32 *)addr);
371 return PCIBIOS_SUCCESSFUL;
374 static struct pci_ops u3_ht_pci_ops =
380 static void __init setup_u3_agp(struct pci_controller* hose)
382 /* On G5, we move AGP up to high bus number so we don't need
383 * to reassign bus numbers for HT. If we ever have P2P bridges
384 * on AGP, we'll have to move pci_assign_all_busses to the
385 * pci_controller structure so we enable it for AGP and not for
387 * We hard code the address because of the different size of
388 * the reg address cell, we shall fix that by killing struct
389 * reg_property and using some accessor functions instead
391 hose->first_busno = 0xf0;
392 hose->last_busno = 0xff;
394 hose->ops = ¯isc_pci_ops;
395 hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
396 hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
401 static void __init setup_u3_ht(struct pci_controller* hose)
403 struct device_node *np = (struct device_node *)hose->arch_data;
406 hose->ops = &u3_ht_pci_ops;
408 /* We hard code the address because of the different size of
409 * the reg address cell, we shall fix that by killing struct
410 * reg_property and using some accessor functions instead
412 hose->cfg_data = (volatile unsigned char *)ioremap(0xf2000000, 0x02000000);
415 * /ht node doesn't expose a "ranges" property, so we "remove" regions that
416 * have been allocated to AGP. So far, this version of the code doesn't assign
417 * any of the 0xfxxxxxxx "fine" memory regions to /ht.
418 * We need to fix that sooner or later by either parsing all child "ranges"
419 * properties or figuring out the U3 address space decoding logic and
420 * then read it's configuration register (if any).
422 hose->io_base_phys = 0xf4000000;
423 hose->io_base_virt = ioremap(hose->io_base_phys, 0x00400000);
424 isa_io_base = pci_io_base = (unsigned long) hose->io_base_virt;
425 hose->io_resource.name = np->full_name;
426 hose->io_resource.start = 0;
427 hose->io_resource.end = 0x003fffff;
428 hose->io_resource.flags = IORESOURCE_IO;
429 hose->pci_mem_offset = 0;
430 hose->first_busno = 0;
431 hose->last_busno = 0xef;
432 hose->mem_resources[0].name = np->full_name;
433 hose->mem_resources[0].start = 0x80000000;
434 hose->mem_resources[0].end = 0xefffffff;
435 hose->mem_resources[0].flags = IORESOURCE_MEM;
437 if (u3_agp == NULL) {
438 DBG("U3 has no AGP, using full resource range\n");
442 /* We "remove" the AGP resources from the resources allocated to HT, that
443 * is we create "holes". However, that code does assumptions that so far
444 * happen to be true (cross fingers...), typically that resources in the
445 * AGP node are properly ordered
448 for (i=0; i<3; i++) {
449 struct resource *res = &u3_agp->mem_resources[i];
450 if (res->flags != IORESOURCE_MEM)
452 /* We don't care about "fine" resources */
453 if (res->start >= 0xf0000000)
455 /* Check if it's just a matter of "shrinking" us in one direction */
456 if (hose->mem_resources[cur].start == res->start) {
457 DBG("U3/HT: shrink start of %d, %08lx -> %08lx\n",
458 cur, hose->mem_resources[cur].start, res->end + 1);
459 hose->mem_resources[cur].start = res->end + 1;
462 if (hose->mem_resources[cur].end == res->end) {
463 DBG("U3/HT: shrink end of %d, %08lx -> %08lx\n",
464 cur, hose->mem_resources[cur].end, res->start - 1);
465 hose->mem_resources[cur].end = res->start - 1;
468 /* No, it's not the case, we need a hole */
470 /* not enough resources for a hole, we drop part of the range */
471 printk(KERN_WARNING "Running out of resources for /ht host !\n");
472 hose->mem_resources[cur].end = res->start - 1;
476 DBG("U3/HT: hole, %d end at %08lx, %d start at %08lx\n",
477 cur-1, res->start - 1, cur, res->end + 1);
478 hose->mem_resources[cur].name = np->full_name;
479 hose->mem_resources[cur].flags = IORESOURCE_MEM;
480 hose->mem_resources[cur].start = res->end + 1;
481 hose->mem_resources[cur].end = hose->mem_resources[cur-1].end;
482 hose->mem_resources[cur-1].end = res->start - 1;
486 static void __init pmac_process_bridge_OF_ranges(struct pci_controller *hose,
487 struct device_node *dev, int primary)
489 static unsigned int static_lc_ranges[2024];
490 unsigned int *dt_ranges, *lc_ranges, *ranges, *prev;
492 int rlen = 0, orig_rlen;
494 struct resource *res;
495 int np, na = prom_n_addr_cells(dev);
499 /* First we try to merge ranges to fix a problem with some pmacs
500 * that can have more than 3 ranges, fortunately using contiguous
503 dt_ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
506 /* lc_ranges = alloc_bootmem(rlen);*/
507 lc_ranges = static_lc_ranges;
509 return; /* what can we do here ? */
510 memcpy(lc_ranges, dt_ranges, rlen);
513 /* Let's work on a copy of the "ranges" property instead of damaging
514 * the device-tree image in memory
518 while ((rlen -= np * sizeof(unsigned int)) >= 0) {
520 if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
521 (prev[2] + prev[na+4]) == ranges[2] &&
522 (prev[na+2] + prev[na+4]) == ranges[na+2]) {
523 prev[na+4] += ranges[na+4];
534 * The ranges property is laid out as an array of elements,
535 * each of which comprises:
536 * cells 0 - 2: a PCI address
537 * cells 3 or 3+4: a CPU physical address
538 * (size depending on dev->n_addr_cells)
539 * cells 4+5 or 5+6: the size of the range
543 while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
546 switch (ranges[0] >> 24) {
547 case 1: /* I/O space */
550 hose->io_base_phys = ranges[na+2];
551 /* limit I/O space to 16MB */
552 if (size > 0x01000000)
554 hose->io_base_virt = ioremap(ranges[na+2], size);
556 isa_io_base = (unsigned long) hose->io_base_virt;
557 res = &hose->io_resource;
558 res->flags = IORESOURCE_IO;
559 res->start = ranges[2];
561 case 2: /* memory space */
563 if (ranges[1] == 0 && ranges[2] == 0
564 && ranges[na+4] <= (16 << 20)) {
565 /* 1st 16MB, i.e. ISA memory area */
568 isa_mem_base = ranges[na+2];
572 while (memno < 3 && hose->mem_resources[memno].flags)
575 hose->pci_mem_offset = ranges[na+2] - ranges[2];
577 res = &hose->mem_resources[memno];
578 res->flags = IORESOURCE_MEM;
579 res->start = ranges[na+2];
584 res->name = dev->full_name;
585 res->end = res->start + size - 1;
595 * We assume that if we have a G3 powermac, we have one bridge called
596 * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
597 * if we have one or more bandit or chaos bridges, we don't have a MPC106.
599 static int __init add_bridge(struct device_node *dev)
602 struct pci_controller *hose;
606 struct property *of_prop;
608 DBG("Adding PCI host bridge %s\n", dev->full_name);
610 bus_range = (int *) get_property(dev, "bus-range", &len);
611 if (bus_range == NULL || len < 2 * sizeof(int)) {
612 printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
616 hose = alloc_bootmem(sizeof(struct pci_controller));
619 pci_setup_pci_controller(hose);
621 hose->arch_data = dev;
622 hose->first_busno = bus_range ? bus_range[0] : 0;
623 hose->last_busno = bus_range ? bus_range[1] : 0xff;
625 of_prop = alloc_bootmem(sizeof(struct property) +
626 sizeof(hose->global_number));
628 memset(of_prop, 0, sizeof(struct property));
629 of_prop->name = "linux,pci-domain";
630 of_prop->length = sizeof(hose->global_number);
631 of_prop->value = (unsigned char *)&of_prop[1];
632 memcpy(of_prop->value, &hose->global_number, sizeof(hose->global_number));
633 prom_add_property(dev, of_prop);
637 if (device_is_compatible(dev, "u3-agp")) {
639 disp_name = "U3-AGP";
641 } else if (device_is_compatible(dev, "u3-ht")) {
646 printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
647 disp_name, hose->first_busno, hose->last_busno);
649 /* Interpret the "ranges" property */
650 /* This also maps the I/O region and sets isa_io/mem_base */
651 pmac_process_bridge_OF_ranges(hose, dev, primary);
653 /* Fixup "bus-range" OF property */
654 fixup_bus_range(dev);
660 * We use our own read_irq_line here because PCI_INTERRUPT_PIN is
661 * crap on some of Apple ASICs. We unconditionally use the Open Firmware
662 * interrupt number as this is always right.
664 static int pmac_pci_read_irq_line(struct pci_dev *pci_dev)
666 struct device_node *node;
668 node = pci_device_to_OF_node(pci_dev);
671 if (node->n_intrs == 0)
673 pci_dev->irq = node->intrs[0].line;
674 pci_write_config_byte(pci_dev, PCI_INTERRUPT_LINE, pci_dev->irq);
679 void __init pmac_pcibios_fixup(void)
681 struct pci_dev *dev = NULL;
683 for_each_pci_dev(dev)
684 pmac_pci_read_irq_line(dev);
687 static void __init pmac_fixup_phb_resources(void)
689 struct pci_controller *hose, *tmp;
691 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
692 unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
693 hose->io_resource.start += offset;
694 hose->io_resource.end += offset;
695 printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
697 hose->io_resource.start, hose->io_resource.end);
701 void __init pmac_pci_init(void)
703 struct device_node *np, *root;
704 struct device_node *ht = NULL;
706 /* Probe root PCI hosts, that is on U3 the AGP host and the
707 * HyperTransport host. That one is actually "kept" around
708 * and actually added last as it's resource management relies
709 * on the AGP resources to have been setup first
711 root = of_find_node_by_path("/");
713 printk(KERN_CRIT "pmac_find_bridges: can't find root of device tree\n");
716 for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
717 if (np->name == NULL)
719 if (strcmp(np->name, "pci") == 0) {
720 if (add_bridge(np) == 0)
723 if (strcmp(np->name, "ht") == 0) {
730 /* Now setup the HyperTransport host if we found any
732 if (ht && add_bridge(ht) != 0)
735 /* Fixup the IO resources on our host bridges as the common code
736 * does it only for childs of the host bridges
738 pmac_fixup_phb_resources();
740 /* Setup the linkage between OF nodes and PHBs */
743 /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
744 * assume there is no P2P bridge on the AGP bus, which should be a
745 * safe assumptions hopefully.
748 struct device_node *np = u3_agp->arch_data;
750 for (np = np->child; np; np = np->sibling)
754 pmac_check_ht_link();
756 /* Tell pci.c to not use the common resource allocation mecanism */
764 * Disable second function on K2-SATA, it's broken
765 * and disable IO BARs on first one
767 static void fixup_k2_sata(struct pci_dev* dev)
772 if (PCI_FUNC(dev->devfn) > 0) {
773 pci_read_config_word(dev, PCI_COMMAND, &cmd);
774 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
775 pci_write_config_word(dev, PCI_COMMAND, cmd);
776 for (i = 0; i < 6; i++) {
777 dev->resource[i].start = dev->resource[i].end = 0;
778 dev->resource[i].flags = 0;
779 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
782 pci_read_config_word(dev, PCI_COMMAND, &cmd);
783 cmd &= ~PCI_COMMAND_IO;
784 pci_write_config_word(dev, PCI_COMMAND, cmd);
785 for (i = 0; i < 5; i++) {
786 dev->resource[i].start = dev->resource[i].end = 0;
787 dev->resource[i].flags = 0;
788 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
792 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);