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[PATCH] powerpc: merge code values for identifying platforms
[linux-block.git] / arch / ppc64 / kernel / pci.c
CommitLineData
1da177e4
LT		 1/*
2 * Port for PPC64 David Engebretsen, IBM Corp.
3 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
4 *
5 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
6 * Rework, based on alpha PCI code.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14#undef DEBUG
15
16#include <linux/config.h>
17#include <linux/kernel.h>
18#include <linux/pci.h>
19#include <linux/string.h>
20#include <linux/init.h>
21#include <linux/bootmem.h>
22#include <linux/mm.h>
23#include <linux/list.h>
b2ad7b5e 24#include <linux/syscalls.h>
1da177e4
LT		 25
26#include <asm/processor.h>
27#include <asm/io.h>
28#include <asm/prom.h>
29#include <asm/pci-bridge.h>
30#include <asm/byteorder.h>
31#include <asm/irq.h>
32#include <asm/machdep.h>
33#include <asm/udbg.h>
d387899f 34#include <asm/ppc-pci.h>
1da177e4
LT		 35
36#ifdef DEBUG
37#define DBG(fmt...) udbg_printf(fmt)
38#else
39#define DBG(fmt...)
40#endif
41
42unsigned long pci_probe_only = 1;
43unsigned long pci_assign_all_buses = 0;
44
45/*
46 * legal IO pages under MAX_ISA_PORT. This is to ensure we don't touch
47 * devices we don't have access to.
48 */
49unsigned long io_page_mask;
50
51EXPORT_SYMBOL(io_page_mask);
52
4267292b
PM		 53#ifdef CONFIG_PPC_MULTIPLATFORM
54static void fixup_resource(struct resource *res, struct pci_dev *dev);
55static void do_bus_setup(struct pci_bus *bus);
56#endif
1da177e4
LT		 57
58unsigned int pcibios_assign_all_busses(void)
59{
60 return pci_assign_all_buses;
61}
62
63/* pci_io_base -- the base address from which io bars are offsets.
64 * This is the lowest I/O base address (so bar values are always positive),
65 * and it *must* be the start of ISA space if an ISA bus exists because
66 * ISA drivers use hard coded offsets. If no ISA bus exists a dummy
67 * page is mapped and isa_io_limit prevents access to it.
68 */
69unsigned long isa_io_base; /* NULL if no ISA bus */
70EXPORT_SYMBOL(isa_io_base);
71unsigned long pci_io_base;
72EXPORT_SYMBOL(pci_io_base);
73
74void iSeries_pcibios_init(void);
75
76LIST_HEAD(hose_list);
77
78struct dma_mapping_ops pci_dma_ops;
79EXPORT_SYMBOL(pci_dma_ops);
80
81int global_phb_number; /* Global phb counter */
82
83/* Cached ISA bridge dev. */
84struct pci_dev *ppc64_isabridge_dev = NULL;
85
86static void fixup_broken_pcnet32(struct pci_dev* dev)
87{
88 if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
89 dev->vendor = PCI_VENDOR_ID_AMD;
90 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
1da177e4
LT		 91 }
92}
93DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32);
94
95void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
96 struct resource *res)
97{
98 unsigned long offset = 0;
99 struct pci_controller *hose = pci_bus_to_host(dev->bus);
100
101 if (!hose)
102 return;
103
104 if (res->flags & IORESOURCE_IO)
105 offset = (unsigned long)hose->io_base_virt - pci_io_base;
106
107 if (res->flags & IORESOURCE_MEM)
108 offset = hose->pci_mem_offset;
109
110 region->start = res->start - offset;
111 region->end = res->end - offset;
112}
113
43c34735
DB		 114void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
115 struct pci_bus_region *region)
116{
117 unsigned long offset = 0;
118 struct pci_controller *hose = pci_bus_to_host(dev->bus);
119
120 if (!hose)
121 return;
122
123 if (res->flags & IORESOURCE_IO)
124 offset = (unsigned long)hose->io_base_virt - pci_io_base;
125
126 if (res->flags & IORESOURCE_MEM)
127 offset = hose->pci_mem_offset;
128
129 res->start = region->start + offset;
130 res->end = region->end + offset;
131}
132
1da177e4
LT		 133#ifdef CONFIG_HOTPLUG
134EXPORT_SYMBOL(pcibios_resource_to_bus);
43c34735 135EXPORT_SYMBOL(pcibios_bus_to_resource);
1da177e4
LT		 136#endif
137
138/*
139 * We need to avoid collisions with `mirrored' VGA ports
140 * and other strange ISA hardware, so we always want the
141 * addresses to be allocated in the 0x000-0x0ff region
142 * modulo 0x400.
143 *
144 * Why? Because some silly external IO cards only decode
145 * the low 10 bits of the IO address. The 0x00-0xff region
146 * is reserved for motherboard devices that decode all 16
147 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
148 * but we want to try to avoid allocating at 0x2900-0x2bff
149 * which might have be mirrored at 0x0100-0x03ff..
150 */
151void pcibios_align_resource(void *data, struct resource *res,
152 unsigned long size, unsigned long align)
153{
154 struct pci_dev *dev = data;
155 struct pci_controller *hose = pci_bus_to_host(dev->bus);
156 unsigned long start = res->start;
157 unsigned long alignto;
158
159 if (res->flags & IORESOURCE_IO) {
160 unsigned long offset = (unsigned long)hose->io_base_virt -
161 pci_io_base;
162 /* Make sure we start at our min on all hoses */
163 if (start - offset < PCIBIOS_MIN_IO)
164 start = PCIBIOS_MIN_IO + offset;
165
166 /*
167 * Put everything into 0x00-0xff region modulo 0x400
168 */
169 if (start & 0x300)
170 start = (start + 0x3ff) & ~0x3ff;
171
172 } else if (res->flags & IORESOURCE_MEM) {
173 /* Make sure we start at our min on all hoses */
174 if (start - hose->pci_mem_offset < PCIBIOS_MIN_MEM)
175 start = PCIBIOS_MIN_MEM + hose->pci_mem_offset;
176
177 /* Align to multiple of size of minimum base. */
178 alignto = max(0x1000UL, align);
179 start = ALIGN(start, alignto);
180 }
181
182 res->start = start;
183}
184
185static DEFINE_SPINLOCK(hose_spinlock);
186
187/*
188 * pci_controller(phb) initialized common variables.
189 */
190void __devinit pci_setup_pci_controller(struct pci_controller *hose)
191{
192 memset(hose, 0, sizeof(struct pci_controller));
193
194 spin_lock(&hose_spinlock);
195 hose->global_number = global_phb_number++;
196 list_add_tail(&hose->list_node, &hose_list);
197 spin_unlock(&hose_spinlock);
198}
199
200static void __init pcibios_claim_one_bus(struct pci_bus *b)
201{
202 struct pci_dev *dev;
203 struct pci_bus *child_bus;
204
205 list_for_each_entry(dev, &b->devices, bus_list) {
206 int i;
207
208 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
209 struct resource *r = &dev->resource[i];
210
211 if (r->parent || !r->start || !r->flags)
212 continue;
213 pci_claim_resource(dev, i);
214 }
215 }
216
217 list_for_each_entry(child_bus, &b->children, node)
218 pcibios_claim_one_bus(child_bus);
219}
220
221#ifndef CONFIG_PPC_ISERIES
222static void __init pcibios_claim_of_setup(void)
223{
224 struct pci_bus *b;
225
226 list_for_each_entry(b, &pci_root_buses, node)
227 pcibios_claim_one_bus(b);
228}
229#endif
230
4267292b
PM		 231#ifdef CONFIG_PPC_MULTIPLATFORM
232static u32 get_int_prop(struct device_node *np, const char *name, u32 def)
233{
234 u32 *prop;
235 int len;
236
237 prop = (u32 *) get_property(np, name, &len);
238 if (prop && len >= 4)
239 return *prop;
240 return def;
241}
242
243static unsigned int pci_parse_of_flags(u32 addr0)
244{
245 unsigned int flags = 0;
246
247 if (addr0 & 0x02000000) {
d79e743e
PM		 248 flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
249 flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
250 flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
4267292b 251 if (addr0 & 0x40000000)
d79e743e
PM		 252 flags |= IORESOURCE_PREFETCH
253 | PCI_BASE_ADDRESS_MEM_PREFETCH;
4267292b 254 } else if (addr0 & 0x01000000)
d79e743e 255 flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
4267292b
PM		 256 return flags;
257}
258
259#define GET_64BIT(prop, i) ((((u64) (prop)[(i)]) << 32) | (prop)[(i)+1])
260
261static void pci_parse_of_addrs(struct device_node *node, struct pci_dev *dev)
262{
263 u64 base, size;
264 unsigned int flags;
265 struct resource *res;
266 u32 *addrs, i;
267 int proplen;
268
269 addrs = (u32 *) get_property(node, "assigned-addresses", &proplen);
270 if (!addrs)
271 return;
272 for (; proplen >= 20; proplen -= 20, addrs += 5) {
273 flags = pci_parse_of_flags(addrs[0]);
274 if (!flags)
275 continue;
276 base = GET_64BIT(addrs, 1);
277 size = GET_64BIT(addrs, 3);
278 if (!size)
279 continue;
280 i = addrs[0] & 0xff;
281 if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
282 res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
283 } else if (i == dev->rom_base_reg) {
284 res = &dev->resource[PCI_ROM_RESOURCE];
285 flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
286 } else {
287 printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
288 continue;
289 }
290 res->start = base;
291 res->end = base + size - 1;
292 res->flags = flags;
293 res->name = pci_name(dev);
294 fixup_resource(res, dev);
295 }
296}
297
ead83717
JR		 298struct pci_dev *of_create_pci_dev(struct device_node *node,
299 struct pci_bus *bus, int devfn)
4267292b
PM		 300{
301 struct pci_dev *dev;
302 const char *type;
303
304 dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
305 if (!dev)
306 return NULL;
307 type = get_property(node, "device_type", NULL);
308 if (type == NULL)
309 type = "";
310
311 memset(dev, 0, sizeof(struct pci_dev));
312 dev->bus = bus;
313 dev->sysdata = node;
314 dev->dev.parent = bus->bridge;
315 dev->dev.bus = &pci_bus_type;
316 dev->devfn = devfn;
317 dev->multifunction = 0; /* maybe a lie? */
318
319 dev->vendor = get_int_prop(node, "vendor-id", 0xffff);
320 dev->device = get_int_prop(node, "device-id", 0xffff);
321 dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0);
322 dev->subsystem_device = get_int_prop(node, "subsystem-id", 0);
323
324 dev->cfg_size = 256; /*pci_cfg_space_size(dev);*/
325
326 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
327 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
328 dev->class = get_int_prop(node, "class-code", 0);
329
330 dev->current_state = 4; /* unknown power state */
331
332 if (!strcmp(type, "pci")) {
333 /* a PCI-PCI bridge */
334 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
335 dev->rom_base_reg = PCI_ROM_ADDRESS1;
336 } else if (!strcmp(type, "cardbus")) {
337 dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
338 } else {
339 dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
340 dev->rom_base_reg = PCI_ROM_ADDRESS;
341 dev->irq = NO_IRQ;
342 if (node->n_intrs > 0) {
343 dev->irq = node->intrs[0].line;
344 pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
345 dev->irq);
346 }
347 }
348
349 pci_parse_of_addrs(node, dev);
350
351 pci_device_add(dev, bus);
352
353 /* XXX pci_scan_msi_device(dev); */
354
355 return dev;
356}
ead83717 357EXPORT_SYMBOL(of_create_pci_dev);
4267292b 358
ead83717 359void __devinit of_scan_bus(struct device_node *node,
4267292b
PM		 360 struct pci_bus *bus)
361{
362 struct device_node *child = NULL;
363 u32 *reg;
364 int reglen, devfn;
365 struct pci_dev *dev;
366
367 while ((child = of_get_next_child(node, child)) != NULL) {
368 reg = (u32 *) get_property(child, "reg", &reglen);
369 if (reg == NULL || reglen < 20)
370 continue;
371 devfn = (reg[0] >> 8) & 0xff;
372 /* create a new pci_dev for this device */
373 dev = of_create_pci_dev(child, bus, devfn);
374 if (!dev)
375 continue;
376 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
377 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
378 of_scan_pci_bridge(child, dev);
379 }
380
381 do_bus_setup(bus);
382}
ead83717 383EXPORT_SYMBOL(of_scan_bus);
4267292b 384
ead83717
JR		 385void __devinit of_scan_pci_bridge(struct device_node *node,
386 struct pci_dev *dev)
4267292b
PM		 387{
388 struct pci_bus *bus;
389 u32 *busrange, *ranges;
390 int len, i, mode;
391 struct resource *res;
392 unsigned int flags;
393 u64 size;
394
395 /* parse bus-range property */
396 busrange = (u32 *) get_property(node, "bus-range", &len);
397 if (busrange == NULL || len != 8) {
398 printk(KERN_ERR "Can't get bus-range for PCI-PCI bridge %s\n",
399 node->full_name);
400 return;
401 }
402 ranges = (u32 *) get_property(node, "ranges", &len);
403 if (ranges == NULL) {
404 printk(KERN_ERR "Can't get ranges for PCI-PCI bridge %s\n",
405 node->full_name);
406 return;
407 }
408
409 bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
410 if (!bus) {
411 printk(KERN_ERR "Failed to create pci bus for %s\n",
412 node->full_name);
413 return;
414 }
415
416 bus->primary = dev->bus->number;
417 bus->subordinate = busrange[1];
418 bus->bridge_ctl = 0;
419 bus->sysdata = node;
420
421 /* parse ranges property */
422 /* PCI #address-cells == 3 and #size-cells == 2 always */
423 res = &dev->resource[PCI_BRIDGE_RESOURCES];
424 for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
425 res->flags = 0;
426 bus->resource[i] = res;
427 ++res;
428 }
429 i = 1;
430 for (; len >= 32; len -= 32, ranges += 8) {
431 flags = pci_parse_of_flags(ranges[0]);
432 size = GET_64BIT(ranges, 6);
433 if (flags == 0 || size == 0)
434 continue;
435 if (flags & IORESOURCE_IO) {
436 res = bus->resource[0];
437 if (res->flags) {
438 printk(KERN_ERR "PCI: ignoring extra I/O range"
439 " for bridge %s\n", node->full_name);
440 continue;
441 }
442 } else {
443 if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
444 printk(KERN_ERR "PCI: too many memory ranges"
445 " for bridge %s\n", node->full_name);
446 continue;
447 }
448 res = bus->resource[i];
449 ++i;
450 }
451 res->start = GET_64BIT(ranges, 1);
452 res->end = res->start + size - 1;
453 res->flags = flags;
454 fixup_resource(res, dev);
455 }
456 sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
457 bus->number);
458
459 mode = PCI_PROBE_NORMAL;
460 if (ppc_md.pci_probe_mode)
461 mode = ppc_md.pci_probe_mode(bus);
462 if (mode == PCI_PROBE_DEVTREE)
463 of_scan_bus(node, bus);
464 else if (mode == PCI_PROBE_NORMAL)
465 pci_scan_child_bus(bus);
466}
ead83717 467EXPORT_SYMBOL(of_scan_pci_bridge);
4267292b
PM		 468#endif /* CONFIG_PPC_MULTIPLATFORM */
469
ead83717 470void __devinit scan_phb(struct pci_controller *hose)
4267292b
PM		 471{
472 struct pci_bus *bus;
473 struct device_node *node = hose->arch_data;
474 int i, mode;
475 struct resource *res;
476
477 bus = pci_create_bus(NULL, hose->first_busno, hose->ops, node);
478 if (bus == NULL) {
479 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
480 hose->global_number);
481 return;
482 }
483 bus->secondary = hose->first_busno;
484 hose->bus = bus;
485
486 bus->resource[0] = res = &hose->io_resource;
487 if (res->flags && request_resource(&ioport_resource, res))
488 printk(KERN_ERR "Failed to request PCI IO region "
489 "on PCI domain %04x\n", hose->global_number);
490
491 for (i = 0; i < 3; ++i) {
492 res = &hose->mem_resources[i];
493 bus->resource[i+1] = res;
494 if (res->flags && request_resource(&iomem_resource, res))
495 printk(KERN_ERR "Failed to request PCI memory region "
496 "on PCI domain %04x\n", hose->global_number);
497 }
498
499 mode = PCI_PROBE_NORMAL;
500#ifdef CONFIG_PPC_MULTIPLATFORM
501 if (ppc_md.pci_probe_mode)
502 mode = ppc_md.pci_probe_mode(bus);
503 if (mode == PCI_PROBE_DEVTREE) {
504 bus->subordinate = hose->last_busno;
505 of_scan_bus(node, bus);
506 }
507#endif /* CONFIG_PPC_MULTIPLATFORM */
508 if (mode == PCI_PROBE_NORMAL)
509 hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
510 pci_bus_add_devices(bus);
511}
512
1da177e4
LT		 513static int __init pcibios_init(void)
514{
515 struct pci_controller *hose, *tmp;
1da177e4
LT		 516
517 /* For now, override phys_mem_access_prot. If we need it,
518 * later, we may move that initialization to each ppc_md
519 */
520 ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
521
522#ifdef CONFIG_PPC_ISERIES
523 iSeries_pcibios_init();
524#endif
525
526 printk("PCI: Probing PCI hardware\n");
527
528 /* Scan all of the recorded PCI controllers. */
4267292b
PM		 529 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
530 scan_phb(hose);
1da177e4
LT		 531
532#ifndef CONFIG_PPC_ISERIES
533 if (pci_probe_only)
534 pcibios_claim_of_setup();
535 else
536 /* FIXME: `else' will be removed when
537 pci_assign_unassigned_resources() is able to work
538 correctly with [partially] allocated PCI tree. */
539 pci_assign_unassigned_resources();
540#endif /* !CONFIG_PPC_ISERIES */
541
542 /* Call machine dependent final fixup */
543 if (ppc_md.pcibios_fixup)
544 ppc_md.pcibios_fixup();
545
546 /* Cache the location of the ISA bridge (if we have one) */
547 ppc64_isabridge_dev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
548 if (ppc64_isabridge_dev != NULL)
549 printk("ISA bridge at %s\n", pci_name(ppc64_isabridge_dev));
550
551 printk("PCI: Probing PCI hardware done\n");
552
553 return 0;
554}
555
556subsys_initcall(pcibios_init);
557
558char __init *pcibios_setup(char *str)
559{
560 return str;
561}
562
563int pcibios_enable_device(struct pci_dev *dev, int mask)
564{
565 u16 cmd, oldcmd;
566 int i;
567
568 pci_read_config_word(dev, PCI_COMMAND, &cmd);
569 oldcmd = cmd;
570
571 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
572 struct resource *res = &dev->resource[i];
573
574 /* Only set up the requested stuff */
575 if (!(mask & (1<<i)))
576 continue;
577
578 if (res->flags & IORESOURCE_IO)
579 cmd |= PCI_COMMAND_IO;
580 if (res->flags & IORESOURCE_MEM)
581 cmd |= PCI_COMMAND_MEMORY;
582 }
583
584 if (cmd != oldcmd) {
585 printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
586 pci_name(dev), cmd);
587 /* Enable the appropriate bits in the PCI command register. */
588 pci_write_config_word(dev, PCI_COMMAND, cmd);
589 }
590 return 0;
591}
592
593/*
594 * Return the domain number for this bus.
595 */
596int pci_domain_nr(struct pci_bus *bus)
597{
598#ifdef CONFIG_PPC_ISERIES
599 return 0;
600#else
601 struct pci_controller *hose = pci_bus_to_host(bus);
602
603 return hose->global_number;
604#endif
605}
606
607EXPORT_SYMBOL(pci_domain_nr);
608
609/* Decide whether to display the domain number in /proc */
610int pci_proc_domain(struct pci_bus *bus)
611{
612#ifdef CONFIG_PPC_ISERIES
613 return 0;
614#else
615 struct pci_controller *hose = pci_bus_to_host(bus);
616 return hose->buid;
617#endif
618}
619
620/*
621 * Platform support for /proc/bus/pci/X/Y mmap()s,
622 * modelled on the sparc64 implementation by Dave Miller.
623 * -- paulus.
624 */
625
626/*
627 * Adjust vm_pgoff of VMA such that it is the physical page offset
628 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
629 *
630 * Basically, the user finds the base address for his device which he wishes
631 * to mmap. They read the 32-bit value from the config space base register,
632 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
633 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
634 *
635 * Returns negative error code on failure, zero on success.
636 */
637static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
638 unsigned long *offset,
639 enum pci_mmap_state mmap_state)
640{
641 struct pci_controller *hose = pci_bus_to_host(dev->bus);
642 unsigned long io_offset = 0;
643 int i, res_bit;
644
645 if (hose == 0)
646 return NULL; /* should never happen */
647
648 /* If memory, add on the PCI bridge address offset */
649 if (mmap_state == pci_mmap_mem) {
650 *offset += hose->pci_mem_offset;
651 res_bit = IORESOURCE_MEM;
652 } else {
2311b1f2 653 io_offset = (unsigned long)hose->io_base_virt - pci_io_base;
1da177e4
LT		 654 *offset += io_offset;
655 res_bit = IORESOURCE_IO;
656 }
657
658 /*
659 * Check that the offset requested corresponds to one of the
660 * resources of the device.
661 */
662 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
663 struct resource *rp = &dev->resource[i];
664 int flags = rp->flags;
665
666 /* treat ROM as memory (should be already) */
667 if (i == PCI_ROM_RESOURCE)
668 flags |= IORESOURCE_MEM;
669
670 /* Active and same type? */
671 if ((flags & res_bit) == 0)
672 continue;
673
674 /* In the range of this resource? */
675 if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
676 continue;
677
678 /* found it! construct the final physical address */
679 if (mmap_state == pci_mmap_io)
2311b1f2 680 *offset += hose->io_base_phys - io_offset;
1da177e4
LT		 681 return rp;
682 }
683
684 return NULL;
685}
686
687/*
688 * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
689 * device mapping.
690 */
691static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
692 pgprot_t protection,
693 enum pci_mmap_state mmap_state,
694 int write_combine)
695{
696 unsigned long prot = pgprot_val(protection);
697
698 /* Write combine is always 0 on non-memory space mappings. On
699 * memory space, if the user didn't pass 1, we check for a
700 * "prefetchable" resource. This is a bit hackish, but we use
701 * this to workaround the inability of /sysfs to provide a write
702 * combine bit
703 */
704 if (mmap_state != pci_mmap_mem)
705 write_combine = 0;
706 else if (write_combine == 0) {
707 if (rp->flags & IORESOURCE_PREFETCH)
708 write_combine = 1;
709 }
710
711 /* XXX would be nice to have a way to ask for write-through */
712 prot |= _PAGE_NO_CACHE;
713 if (write_combine)
714 prot &= ~_PAGE_GUARDED;
715 else
716 prot |= _PAGE_GUARDED;
717
718 printk("PCI map for %s:%lx, prot: %lx\n", pci_name(dev), rp->start,
719 prot);
720
721 return __pgprot(prot);
722}
723
724/*
725 * This one is used by /dev/mem and fbdev who have no clue about the
726 * PCI device, it tries to find the PCI device first and calls the
727 * above routine
728 */
729pgprot_t pci_phys_mem_access_prot(struct file *file,
8b150478 730 unsigned long pfn,
1da177e4
LT		 731 unsigned long size,
732 pgprot_t protection)
733{
734 struct pci_dev *pdev = NULL;
735 struct resource *found = NULL;
736 unsigned long prot = pgprot_val(protection);
8b150478 737 unsigned long offset = pfn << PAGE_SHIFT;
1da177e4
LT		 738 int i;
739
8b150478 740 if (page_is_ram(pfn))
1f8d419e 741 return __pgprot(prot);
1da177e4
LT		 742
743 prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
744
745 for_each_pci_dev(pdev) {
746 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
747 struct resource *rp = &pdev->resource[i];
748 int flags = rp->flags;
749
750 /* Active and same type? */
751 if ((flags & IORESOURCE_MEM) == 0)
752 continue;
753 /* In the range of this resource? */
754 if (offset < (rp->start & PAGE_MASK) ||
755 offset > rp->end)
756 continue;
757 found = rp;
758 break;
759 }
760 if (found)
761 break;
762 }
763 if (found) {
764 if (found->flags & IORESOURCE_PREFETCH)
765 prot &= ~_PAGE_GUARDED;
766 pci_dev_put(pdev);
767 }
768
769 DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
770
771 return __pgprot(prot);
772}
773
774
775/*
776 * Perform the actual remap of the pages for a PCI device mapping, as
777 * appropriate for this architecture. The region in the process to map
778 * is described by vm_start and vm_end members of VMA, the base physical
779 * address is found in vm_pgoff.
780 * The pci device structure is provided so that architectures may make mapping
781 * decisions on a per-device or per-bus basis.
782 *
783 * Returns a negative error code on failure, zero on success.
784 */
785int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
786 enum pci_mmap_state mmap_state,
787 int write_combine)
788{
789 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
790 struct resource *rp;
791 int ret;
792
793 rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
794 if (rp == NULL)
795 return -EINVAL;
796
797 vma->vm_pgoff = offset >> PAGE_SHIFT;
798 vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
799 vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
800 vma->vm_page_prot,
801 mmap_state, write_combine);
802
803 ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
804 vma->vm_end - vma->vm_start, vma->vm_page_prot);
805
806 return ret;
807}
808
809#ifdef CONFIG_PPC_MULTIPLATFORM
ff381d22 810static ssize_t pci_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 811{
812 struct pci_dev *pdev;
813 struct device_node *np;
814
815 pdev = to_pci_dev (dev);
816 np = pci_device_to_OF_node(pdev);
817 if (np == NULL || np->full_name == NULL)
818 return 0;
819 return sprintf(buf, "%s", np->full_name);
820}
821static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
822#endif /* CONFIG_PPC_MULTIPLATFORM */
823
824void pcibios_add_platform_entries(struct pci_dev *pdev)
825{
826#ifdef CONFIG_PPC_MULTIPLATFORM
827 device_create_file(&pdev->dev, &dev_attr_devspec);
828#endif /* CONFIG_PPC_MULTIPLATFORM */
829}
830
831#ifdef CONFIG_PPC_MULTIPLATFORM
832
833#define ISA_SPACE_MASK 0x1
834#define ISA_SPACE_IO 0x1
835
836static void __devinit pci_process_ISA_OF_ranges(struct device_node *isa_node,
837 unsigned long phb_io_base_phys,
838 void __iomem * phb_io_base_virt)
839{
840 struct isa_range *range;
841 unsigned long pci_addr;
842 unsigned int isa_addr;
843 unsigned int size;
844 int rlen = 0;
845
846 range = (struct isa_range *) get_property(isa_node, "ranges", &rlen);
847 if (range == NULL || (rlen < sizeof(struct isa_range))) {
848 printk(KERN_ERR "no ISA ranges or unexpected isa range size,"
849 "mapping 64k\n");
dfbacdc1
BH		 850 __ioremap_explicit(phb_io_base_phys,
851 (unsigned long)phb_io_base_virt,
852 0x10000, _PAGE_NO_CACHE | _PAGE_GUARDED);
1da177e4
LT		 853 return;
854 }
855
856 /* From "ISA Binding to 1275"
857 * The ranges property is laid out as an array of elements,
858 * each of which comprises:
859 * cells 0 - 1: an ISA address
860 * cells 2 - 4: a PCI address
861 * (size depending on dev->n_addr_cells)
862 * cell 5: the size of the range
863 */
864 if ((range->isa_addr.a_hi && ISA_SPACE_MASK) == ISA_SPACE_IO) {
865 isa_addr = range->isa_addr.a_lo;
866 pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |
867 range->pci_addr.a_lo;
868
869 /* Assume these are both zero */
870 if ((pci_addr != 0) || (isa_addr != 0)) {
871 printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
872 __FUNCTION__);
873 return;
874 }
875
876 size = PAGE_ALIGN(range->size);
877
878 __ioremap_explicit(phb_io_base_phys,
879 (unsigned long) phb_io_base_virt,
dfbacdc1 880 size, _PAGE_NO_CACHE | _PAGE_GUARDED);
1da177e4
LT		 881 }
882}
883
884void __devinit pci_process_bridge_OF_ranges(struct pci_controller *hose,
f7abbc19 885 struct device_node *dev, int prim)
1da177e4 886{
f7abbc19 887 unsigned int *ranges, pci_space;
1da177e4
LT		 888 unsigned long size;
889 int rlen = 0;
890 int memno = 0;
891 struct resource *res;
892 int np, na = prom_n_addr_cells(dev);
893 unsigned long pci_addr, cpu_phys_addr;
894
895 np = na + 5;
896
897 /* From "PCI Binding to 1275"
898 * The ranges property is laid out as an array of elements,
899 * each of which comprises:
900 * cells 0 - 2: a PCI address
901 * cells 3 or 3+4: a CPU physical address
902 * (size depending on dev->n_addr_cells)
903 * cells 4+5 or 5+6: the size of the range
904 */
905 rlen = 0;
906 hose->io_base_phys = 0;
907 ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
908 while ((rlen -= np * sizeof(unsigned int)) >= 0) {
909 res = NULL;
f7abbc19
PM		 910 pci_space = ranges[0];
911 pci_addr = ((unsigned long)ranges[1] << 32) | ranges[2];
1da177e4
LT		 912
913 cpu_phys_addr = ranges[3];
f7abbc19
PM		 914 if (na >= 2)
915 cpu_phys_addr = (cpu_phys_addr << 32) | ranges[4];
1da177e4 916
f7abbc19
PM		 917 size = ((unsigned long)ranges[na+3] << 32) | ranges[na+4];
918 ranges += np;
1da177e4
LT		 919 if (size == 0)
920 continue;
f7abbc19
PM		 921
922 /* Now consume following elements while they are contiguous */
923 while (rlen >= np * sizeof(unsigned int)) {
924 unsigned long addr, phys;
925
926 if (ranges[0] != pci_space)
927 break;
928 addr = ((unsigned long)ranges[1] << 32) | ranges[2];
929 phys = ranges[3];
930 if (na >= 2)
931 phys = (phys << 32) | ranges[4];
932 if (addr != pci_addr + size ||
933 phys != cpu_phys_addr + size)
934 break;
935
936 size += ((unsigned long)ranges[na+3] << 32)
937 | ranges[na+4];
938 ranges += np;
939 rlen -= np * sizeof(unsigned int);
940 }
941
942 switch ((pci_space >> 24) & 0x3) {
1da177e4
LT		 943 case 1: /* I/O space */
944 hose->io_base_phys = cpu_phys_addr;
945 hose->pci_io_size = size;
946
947 res = &hose->io_resource;
948 res->flags = IORESOURCE_IO;
949 res->start = pci_addr;
950 DBG("phb%d: IO 0x%lx -> 0x%lx\n", hose->global_number,
951 res->start, res->start + size - 1);
952 break;
953 case 2: /* memory space */
954 memno = 0;
955 while (memno < 3 && hose->mem_resources[memno].flags)
956 ++memno;
957
958 if (memno == 0)
959 hose->pci_mem_offset = cpu_phys_addr - pci_addr;
960 if (memno < 3) {
961 res = &hose->mem_resources[memno];
962 res->flags = IORESOURCE_MEM;
963 res->start = cpu_phys_addr;
964 DBG("phb%d: MEM 0x%lx -> 0x%lx\n", hose->global_number,
965 res->start, res->start + size - 1);
966 }
967 break;
968 }
969 if (res != NULL) {
970 res->name = dev->full_name;
971 res->end = res->start + size - 1;
972 res->parent = NULL;
973 res->sibling = NULL;
974 res->child = NULL;
975 }
1da177e4
LT		 976 }
977}
978
979void __init pci_setup_phb_io(struct pci_controller *hose, int primary)
980{
981 unsigned long size = hose->pci_io_size;
982 unsigned long io_virt_offset;
983 struct resource *res;
984 struct device_node *isa_dn;
985
986 hose->io_base_virt = reserve_phb_iospace(size);
987 DBG("phb%d io_base_phys 0x%lx io_base_virt 0x%lx\n",
988 hose->global_number, hose->io_base_phys,
989 (unsigned long) hose->io_base_virt);
990
991 if (primary) {
992 pci_io_base = (unsigned long)hose->io_base_virt;
993 isa_dn = of_find_node_by_type(NULL, "isa");
994 if (isa_dn) {
995 isa_io_base = pci_io_base;
996 pci_process_ISA_OF_ranges(isa_dn, hose->io_base_phys,
997 hose->io_base_virt);
998 of_node_put(isa_dn);
999 /* Allow all IO */
1000 io_page_mask = -1;
1001 }
1002 }
1003
1004 io_virt_offset = (unsigned long)hose->io_base_virt - pci_io_base;
1005 res = &hose->io_resource;
1006 res->start += io_virt_offset;
1007 res->end += io_virt_offset;
1008}
1009
1010void __devinit pci_setup_phb_io_dynamic(struct pci_controller *hose,
1011 int primary)
1012{
1013 unsigned long size = hose->pci_io_size;
1014 unsigned long io_virt_offset;
1015 struct resource *res;
1016
1017 hose->io_base_virt = __ioremap(hose->io_base_phys, size,
dfbacdc1 1018 _PAGE_NO_CACHE | _PAGE_GUARDED);
1da177e4
LT		 1019 DBG("phb%d io_base_phys 0x%lx io_base_virt 0x%lx\n",
1020 hose->global_number, hose->io_base_phys,
1021 (unsigned long) hose->io_base_virt);
1022
1023 if (primary)
1024 pci_io_base = (unsigned long)hose->io_base_virt;
1025
1026 io_virt_offset = (unsigned long)hose->io_base_virt - pci_io_base;
1027 res = &hose->io_resource;
1028 res->start += io_virt_offset;
1029 res->end += io_virt_offset;
1030}
1031
1032
1033static int get_bus_io_range(struct pci_bus *bus, unsigned long *start_phys,
1034 unsigned long *start_virt, unsigned long *size)
1035{
1036 struct pci_controller *hose = pci_bus_to_host(bus);
1037 struct pci_bus_region region;
1038 struct resource *res;
1039
1040 if (bus->self) {
1041 res = bus->resource[0];
1042 pcibios_resource_to_bus(bus->self, &region, res);
1043 *start_phys = hose->io_base_phys + region.start;
1044 *start_virt = (unsigned long) hose->io_base_virt +
1045 region.start;
1046 if (region.end > region.start)
1047 *size = region.end - region.start + 1;
1048 else {
1049 printk("%s(): unexpected region 0x%lx->0x%lx\n",
1050 __FUNCTION__, region.start, region.end);
1051 return 1;
1052 }
1053
1054 } else {
1055 /* Root Bus */
1056 res = &hose->io_resource;
1057 *start_phys = hose->io_base_phys;
1058 *start_virt = (unsigned long) hose->io_base_virt;
1059 if (res->end > res->start)
1060 *size = res->end - res->start + 1;
1061 else {
1062 printk("%s(): unexpected region 0x%lx->0x%lx\n",
1063 __FUNCTION__, res->start, res->end);
1064 return 1;
1065 }
1066 }
1067
1068 return 0;
1069}
1070
1071int unmap_bus_range(struct pci_bus *bus)
1072{
1073 unsigned long start_phys;
1074 unsigned long start_virt;
1075 unsigned long size;
1076
1077 if (!bus) {
1078 printk(KERN_ERR "%s() expected bus\n", __FUNCTION__);
1079 return 1;
1080 }
1081
1082 if (get_bus_io_range(bus, &start_phys, &start_virt, &size))
1083 return 1;
1084 if (iounmap_explicit((void __iomem *) start_virt, size))
1085 return 1;
1086
1087 return 0;
1088}
1089EXPORT_SYMBOL(unmap_bus_range);
1090
1091int remap_bus_range(struct pci_bus *bus)
1092{
1093 unsigned long start_phys;
1094 unsigned long start_virt;
1095 unsigned long size;
1096
1097 if (!bus) {
1098 printk(KERN_ERR "%s() expected bus\n", __FUNCTION__);
1099 return 1;
1100 }
1101
1102
1103 if (get_bus_io_range(bus, &start_phys, &start_virt, &size))
1104 return 1;
1105 printk("mapping IO %lx -> %lx, size: %lx\n", start_phys, start_virt, size);
dfbacdc1
BH		 1106 if (__ioremap_explicit(start_phys, start_virt, size,
1107 _PAGE_NO_CACHE | _PAGE_GUARDED))
1da177e4
LT		 1108 return 1;
1109
1110 return 0;
1111}
1112EXPORT_SYMBOL(remap_bus_range);
1113
1114void phbs_remap_io(void)
1115{
1116 struct pci_controller *hose, *tmp;
1117
1118 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
1119 remap_bus_range(hose->bus);
1120}
1121
1122/*
1123 * ppc64 can have multifunction devices that do not respond to function 0.
1124 * In this case we must scan all functions.
4267292b
PM		 1125 * XXX this can go now, we use the OF device tree in all the
1126 * cases that caused problems. -- paulus
1da177e4
LT		 1127 */
1128int pcibios_scan_all_fns(struct pci_bus *bus, int devfn)
1129{
4267292b
PM		 1130 return 0;
1131}
1da177e4 1132
4267292b
PM		 1133static void __devinit fixup_resource(struct resource *res, struct pci_dev *dev)
1134{
1135 struct pci_controller *hose = pci_bus_to_host(dev->bus);
1136 unsigned long start, end, mask, offset;
1da177e4 1137
4267292b
PM		 1138 if (res->flags & IORESOURCE_IO) {
1139 offset = (unsigned long)hose->io_base_virt - pci_io_base;
1da177e4 1140
4267292b
PM		 1141 start = res->start += offset;
1142 end = res->end += offset;
1da177e4 1143
4267292b
PM		 1144 /* Need to allow IO access to pages that are in the
1145 ISA range */
1146 if (start < MAX_ISA_PORT) {
1147 if (end > MAX_ISA_PORT)
1148 end = MAX_ISA_PORT;
1149
1150 start >>= PAGE_SHIFT;
1151 end >>= PAGE_SHIFT;
1da177e4 1152
4267292b
PM		 1153 /* get the range of pages for the map */
1154 mask = ((1 << (end+1)) - 1) ^ ((1 << start) - 1);
1155 io_page_mask |= mask;
1156 }
1157 } else if (res->flags & IORESOURCE_MEM) {
1158 res->start += hose->pci_mem_offset;
1159 res->end += hose->pci_mem_offset;
1160 }
1161}
1da177e4
LT		 1162
1163void __devinit pcibios_fixup_device_resources(struct pci_dev *dev,
4267292b 1164 struct pci_bus *bus)
1da177e4
LT		 1165{
1166 /* Update device resources. */
1da177e4
LT		 1167 int i;
1168
4267292b
PM		 1169 for (i = 0; i < PCI_NUM_RESOURCES; i++)
1170 if (dev->resource[i].flags)
1171 fixup_resource(&dev->resource[i], dev);
1da177e4
LT		 1172}
1173EXPORT_SYMBOL(pcibios_fixup_device_resources);
1174
4267292b 1175static void __devinit do_bus_setup(struct pci_bus *bus)
1da177e4 1176{
4267292b 1177 struct pci_dev *dev;
1da177e4 1178
4267292b 1179 ppc_md.iommu_bus_setup(bus);
1da177e4 1180
4267292b
PM		 1181 list_for_each_entry(dev, &bus->devices, bus_list)
1182 ppc_md.iommu_dev_setup(dev);
1da177e4 1183
4267292b
PM		 1184 if (ppc_md.irq_bus_setup)
1185 ppc_md.irq_bus_setup(bus);
1186}
1da177e4 1187
4267292b
PM		 1188void __devinit pcibios_fixup_bus(struct pci_bus *bus)
1189{
1190 struct pci_dev *dev = bus->self;
1191
1192 if (dev && pci_probe_only &&
1193 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1da177e4
LT		 1194 /* This is a subordinate bridge */
1195
1196 pci_read_bridge_bases(bus);
1197 pcibios_fixup_device_resources(dev, bus);
1198 }
1199
4267292b 1200 do_bus_setup(bus);
dad32bbf 1201
1da177e4
LT		 1202 if (!pci_probe_only)
1203 return;
1204
4267292b 1205 list_for_each_entry(dev, &bus->devices, bus_list)
1da177e4
LT		 1206 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1207 pcibios_fixup_device_resources(dev, bus);
1da177e4
LT		 1208}
1209EXPORT_SYMBOL(pcibios_fixup_bus);
1210
1211/*
1212 * Reads the interrupt pin to determine if interrupt is use by card.
1213 * If the interrupt is used, then gets the interrupt line from the
1214 * openfirmware and sets it in the pci_dev and pci_config line.
1215 */
1216int pci_read_irq_line(struct pci_dev *pci_dev)
1217{
1218 u8 intpin;
1219 struct device_node *node;
1220
1221 pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &intpin);
1222 if (intpin == 0)
1223 return 0;
1224
1225 node = pci_device_to_OF_node(pci_dev);
1226 if (node == NULL)
1227 return -1;
1228
1229 if (node->n_intrs == 0)
1230 return -1;
1231
1232 pci_dev->irq = node->intrs[0].line;
1233
1234 pci_write_config_byte(pci_dev, PCI_INTERRUPT_LINE, pci_dev->irq);
1235
1236 return 0;
1237}
1238EXPORT_SYMBOL(pci_read_irq_line);
1239
2311b1f2
ME		 1240void pci_resource_to_user(const struct pci_dev *dev, int bar,
1241 const struct resource *rsrc,
1242 u64 *start, u64 *end)
1243{
1244 struct pci_controller *hose = pci_bus_to_host(dev->bus);
1245 unsigned long offset = 0;
1246
1247 if (hose == NULL)
1248 return;
1249
1250 if (rsrc->flags & IORESOURCE_IO)
1251 offset = pci_io_base - (unsigned long)hose->io_base_virt +
1252 hose->io_base_phys;
1253
1254 *start = rsrc->start + offset;
1255 *end = rsrc->end + offset;
1256}
1257
1da177e4 1258#endif /* CONFIG_PPC_MULTIPLATFORM */
b2ad7b5e
PM		 1259
1260
1261#define IOBASE_BRIDGE_NUMBER 0
1262#define IOBASE_MEMORY 1
1263#define IOBASE_IO 2
1264#define IOBASE_ISA_IO 3
1265#define IOBASE_ISA_MEM 4
1266
1267long sys_pciconfig_iobase(long which, unsigned long in_bus,
1268 unsigned long in_devfn)
1269{
1270 struct pci_controller* hose;
1271 struct list_head *ln;
1272 struct pci_bus *bus = NULL;
1273 struct device_node *hose_node;
1274
1275 /* Argh ! Please forgive me for that hack, but that's the
1276 * simplest way to get existing XFree to not lockup on some
1277 * G5 machines... So when something asks for bus 0 io base
1278 * (bus 0 is HT root), we return the AGP one instead.
1279 */
799d6046 1280 if (machine_is_compatible("MacRISC4"))
b2ad7b5e
PM		 1281 if (in_bus == 0)
1282 in_bus = 0xf0;
b2ad7b5e
PM		 1283
1284 /* That syscall isn't quite compatible with PCI domains, but it's
1285 * used on pre-domains setup. We return the first match
1286 */
1287
1288 for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
1289 bus = pci_bus_b(ln);
1290 if (in_bus >= bus->number && in_bus < (bus->number + bus->subordinate))
1291 break;
1292 bus = NULL;
1293 }
1294 if (bus == NULL || bus->sysdata == NULL)
1295 return -ENODEV;
1296
1297 hose_node = (struct device_node *)bus->sysdata;
1298 hose = PCI_DN(hose_node)->phb;
1299
1300 switch (which) {
1301 case IOBASE_BRIDGE_NUMBER:
1302 return (long)hose->first_busno;
1303 case IOBASE_MEMORY:
1304 return (long)hose->pci_mem_offset;
1305 case IOBASE_IO:
1306 return (long)hose->io_base_phys;
1307 case IOBASE_ISA_IO:
1308 return (long)isa_io_base;
1309 case IOBASE_ISA_MEM:
1310 return -EINVAL;
1311 }
1312
1313 return -EOPNOTSUPP;
1314}
Linux 6.x block layer and io_uring tree(s)