Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Contains common pci routines for ALL ppc platform |
| 3 | * (based on pci_32.c and pci_64.c) |
| 4 | * |
| 5 | * Port for PPC64 David Engebretsen, IBM Corp. |
| 6 | * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. |
| 7 | * |
| 8 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM |
| 9 | * Rework, based on alpha PCI code. |
| 10 | * |
| 11 | * Common pmac/prep/chrp pci routines. -- Cort |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/bootmem.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/syscalls.h> |
| 27 | #include <linux/irq.h> |
| 28 | #include <linux/vmalloc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Grant Likely | f1ca09b | 2010-08-16 23:44:49 -0600 | [diff] [blame] | 30 | #include <linux/of.h> |
| 31 | #include <linux/of_address.h> |
Rob Herring | 5c9f303 | 2013-09-07 14:05:10 -0500 | [diff] [blame] | 32 | #include <linux/of_irq.h> |
Sebastian Andrzej Siewior | 04bea68 | 2011-01-24 09:58:55 +0530 | [diff] [blame] | 33 | #include <linux/of_pci.h> |
Paul Gortmaker | 66421a6 | 2011-09-22 11:22:55 -0400 | [diff] [blame] | 34 | #include <linux/export.h> |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 35 | |
| 36 | #include <asm/processor.h> |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 37 | #include <linux/io.h> |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 38 | #include <asm/pci-bridge.h> |
| 39 | #include <asm/byteorder.h> |
| 40 | |
| 41 | static DEFINE_SPINLOCK(hose_spinlock); |
| 42 | LIST_HEAD(hose_list); |
| 43 | |
| 44 | /* XXX kill that some day ... */ |
| 45 | static int global_phb_number; /* Global phb counter */ |
| 46 | |
| 47 | /* ISA Memory physical address */ |
| 48 | resource_size_t isa_mem_base; |
| 49 | |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 50 | unsigned long isa_io_base; |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 51 | static int pci_bus_count; |
| 52 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 53 | struct pci_controller *pcibios_alloc_controller(struct device_node *dev) |
| 54 | { |
| 55 | struct pci_controller *phb; |
| 56 | |
| 57 | phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); |
| 58 | if (!phb) |
| 59 | return NULL; |
| 60 | spin_lock(&hose_spinlock); |
| 61 | phb->global_number = global_phb_number++; |
| 62 | list_add_tail(&phb->list_node, &hose_list); |
| 63 | spin_unlock(&hose_spinlock); |
| 64 | phb->dn = dev; |
| 65 | phb->is_dynamic = mem_init_done; |
| 66 | return phb; |
| 67 | } |
| 68 | |
| 69 | void pcibios_free_controller(struct pci_controller *phb) |
| 70 | { |
| 71 | spin_lock(&hose_spinlock); |
| 72 | list_del(&phb->list_node); |
| 73 | spin_unlock(&hose_spinlock); |
| 74 | |
| 75 | if (phb->is_dynamic) |
| 76 | kfree(phb); |
| 77 | } |
| 78 | |
| 79 | static resource_size_t pcibios_io_size(const struct pci_controller *hose) |
| 80 | { |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 81 | return resource_size(&hose->io_resource); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | int pcibios_vaddr_is_ioport(void __iomem *address) |
| 85 | { |
| 86 | int ret = 0; |
| 87 | struct pci_controller *hose; |
| 88 | resource_size_t size; |
| 89 | |
| 90 | spin_lock(&hose_spinlock); |
| 91 | list_for_each_entry(hose, &hose_list, list_node) { |
| 92 | size = pcibios_io_size(hose); |
| 93 | if (address >= hose->io_base_virt && |
| 94 | address < (hose->io_base_virt + size)) { |
| 95 | ret = 1; |
| 96 | break; |
| 97 | } |
| 98 | } |
| 99 | spin_unlock(&hose_spinlock); |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | unsigned long pci_address_to_pio(phys_addr_t address) |
| 104 | { |
| 105 | struct pci_controller *hose; |
| 106 | resource_size_t size; |
| 107 | unsigned long ret = ~0; |
| 108 | |
| 109 | spin_lock(&hose_spinlock); |
| 110 | list_for_each_entry(hose, &hose_list, list_node) { |
| 111 | size = pcibios_io_size(hose); |
| 112 | if (address >= hose->io_base_phys && |
| 113 | address < (hose->io_base_phys + size)) { |
| 114 | unsigned long base = |
| 115 | (unsigned long)hose->io_base_virt - _IO_BASE; |
| 116 | ret = base + (address - hose->io_base_phys); |
| 117 | break; |
| 118 | } |
| 119 | } |
| 120 | spin_unlock(&hose_spinlock); |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | EXPORT_SYMBOL_GPL(pci_address_to_pio); |
| 125 | |
| 126 | /* |
| 127 | * Return the domain number for this bus. |
| 128 | */ |
| 129 | int pci_domain_nr(struct pci_bus *bus) |
| 130 | { |
| 131 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 132 | |
| 133 | return hose->global_number; |
| 134 | } |
| 135 | EXPORT_SYMBOL(pci_domain_nr); |
| 136 | |
| 137 | /* This routine is meant to be used early during boot, when the |
| 138 | * PCI bus numbers have not yet been assigned, and you need to |
| 139 | * issue PCI config cycles to an OF device. |
| 140 | * It could also be used to "fix" RTAS config cycles if you want |
| 141 | * to set pci_assign_all_buses to 1 and still use RTAS for PCI |
| 142 | * config cycles. |
| 143 | */ |
| 144 | struct pci_controller *pci_find_hose_for_OF_device(struct device_node *node) |
| 145 | { |
| 146 | while (node) { |
| 147 | struct pci_controller *hose, *tmp; |
| 148 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
| 149 | if (hose->dn == node) |
| 150 | return hose; |
| 151 | node = node->parent; |
| 152 | } |
| 153 | return NULL; |
| 154 | } |
| 155 | |
Myron Stowe | b51d4a3 | 2011-10-28 15:47:56 -0600 | [diff] [blame] | 156 | void pcibios_set_master(struct pci_dev *dev) |
| 157 | { |
| 158 | /* No special bus mastering setup handling */ |
| 159 | } |
| 160 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 161 | /* |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 162 | * Platform support for /proc/bus/pci/X/Y mmap()s, |
| 163 | * modelled on the sparc64 implementation by Dave Miller. |
| 164 | * -- paulus. |
| 165 | */ |
| 166 | |
| 167 | /* |
| 168 | * Adjust vm_pgoff of VMA such that it is the physical page offset |
| 169 | * corresponding to the 32-bit pci bus offset for DEV requested by the user. |
| 170 | * |
| 171 | * Basically, the user finds the base address for his device which he wishes |
| 172 | * to mmap. They read the 32-bit value from the config space base register, |
| 173 | * add whatever PAGE_SIZE multiple offset they wish, and feed this into the |
| 174 | * offset parameter of mmap on /proc/bus/pci/XXX for that device. |
| 175 | * |
| 176 | * Returns negative error code on failure, zero on success. |
| 177 | */ |
| 178 | static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, |
| 179 | resource_size_t *offset, |
| 180 | enum pci_mmap_state mmap_state) |
| 181 | { |
| 182 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 183 | unsigned long io_offset = 0; |
| 184 | int i, res_bit; |
| 185 | |
Michal Simek | f7eaacc | 2013-01-04 09:14:46 +0100 | [diff] [blame] | 186 | if (!hose) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 187 | return NULL; /* should never happen */ |
| 188 | |
| 189 | /* If memory, add on the PCI bridge address offset */ |
| 190 | if (mmap_state == pci_mmap_mem) { |
| 191 | #if 0 /* See comment in pci_resource_to_user() for why this is disabled */ |
| 192 | *offset += hose->pci_mem_offset; |
| 193 | #endif |
| 194 | res_bit = IORESOURCE_MEM; |
| 195 | } else { |
| 196 | io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 197 | *offset += io_offset; |
| 198 | res_bit = IORESOURCE_IO; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Check that the offset requested corresponds to one of the |
| 203 | * resources of the device. |
| 204 | */ |
| 205 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 206 | struct resource *rp = &dev->resource[i]; |
| 207 | int flags = rp->flags; |
| 208 | |
| 209 | /* treat ROM as memory (should be already) */ |
| 210 | if (i == PCI_ROM_RESOURCE) |
| 211 | flags |= IORESOURCE_MEM; |
| 212 | |
| 213 | /* Active and same type? */ |
| 214 | if ((flags & res_bit) == 0) |
| 215 | continue; |
| 216 | |
| 217 | /* In the range of this resource? */ |
| 218 | if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) |
| 219 | continue; |
| 220 | |
| 221 | /* found it! construct the final physical address */ |
| 222 | if (mmap_state == pci_mmap_io) |
| 223 | *offset += hose->io_base_phys - io_offset; |
| 224 | return rp; |
| 225 | } |
| 226 | |
| 227 | return NULL; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci |
| 232 | * device mapping. |
| 233 | */ |
| 234 | static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, |
| 235 | pgprot_t protection, |
| 236 | enum pci_mmap_state mmap_state, |
| 237 | int write_combine) |
| 238 | { |
| 239 | pgprot_t prot = protection; |
| 240 | |
| 241 | /* Write combine is always 0 on non-memory space mappings. On |
| 242 | * memory space, if the user didn't pass 1, we check for a |
| 243 | * "prefetchable" resource. This is a bit hackish, but we use |
| 244 | * this to workaround the inability of /sysfs to provide a write |
| 245 | * combine bit |
| 246 | */ |
| 247 | if (mmap_state != pci_mmap_mem) |
| 248 | write_combine = 0; |
| 249 | else if (write_combine == 0) { |
| 250 | if (rp->flags & IORESOURCE_PREFETCH) |
| 251 | write_combine = 1; |
| 252 | } |
| 253 | |
| 254 | return pgprot_noncached(prot); |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * This one is used by /dev/mem and fbdev who have no clue about the |
| 259 | * PCI device, it tries to find the PCI device first and calls the |
| 260 | * above routine |
| 261 | */ |
| 262 | pgprot_t pci_phys_mem_access_prot(struct file *file, |
| 263 | unsigned long pfn, |
| 264 | unsigned long size, |
| 265 | pgprot_t prot) |
| 266 | { |
| 267 | struct pci_dev *pdev = NULL; |
| 268 | struct resource *found = NULL; |
| 269 | resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; |
| 270 | int i; |
| 271 | |
| 272 | if (page_is_ram(pfn)) |
| 273 | return prot; |
| 274 | |
| 275 | prot = pgprot_noncached(prot); |
| 276 | for_each_pci_dev(pdev) { |
| 277 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 278 | struct resource *rp = &pdev->resource[i]; |
| 279 | int flags = rp->flags; |
| 280 | |
| 281 | /* Active and same type? */ |
| 282 | if ((flags & IORESOURCE_MEM) == 0) |
| 283 | continue; |
| 284 | /* In the range of this resource? */ |
| 285 | if (offset < (rp->start & PAGE_MASK) || |
| 286 | offset > rp->end) |
| 287 | continue; |
| 288 | found = rp; |
| 289 | break; |
| 290 | } |
| 291 | if (found) |
| 292 | break; |
| 293 | } |
| 294 | if (found) { |
| 295 | if (found->flags & IORESOURCE_PREFETCH) |
| 296 | prot = pgprot_noncached_wc(prot); |
| 297 | pci_dev_put(pdev); |
| 298 | } |
| 299 | |
| 300 | pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", |
| 301 | (unsigned long long)offset, pgprot_val(prot)); |
| 302 | |
| 303 | return prot; |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Perform the actual remap of the pages for a PCI device mapping, as |
| 308 | * appropriate for this architecture. The region in the process to map |
| 309 | * is described by vm_start and vm_end members of VMA, the base physical |
| 310 | * address is found in vm_pgoff. |
| 311 | * The pci device structure is provided so that architectures may make mapping |
| 312 | * decisions on a per-device or per-bus basis. |
| 313 | * |
| 314 | * Returns a negative error code on failure, zero on success. |
| 315 | */ |
| 316 | int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, |
| 317 | enum pci_mmap_state mmap_state, int write_combine) |
| 318 | { |
| 319 | resource_size_t offset = |
| 320 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; |
| 321 | struct resource *rp; |
| 322 | int ret; |
| 323 | |
| 324 | rp = __pci_mmap_make_offset(dev, &offset, mmap_state); |
| 325 | if (rp == NULL) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | vma->vm_pgoff = offset >> PAGE_SHIFT; |
| 329 | vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, |
| 330 | vma->vm_page_prot, |
| 331 | mmap_state, write_combine); |
| 332 | |
| 333 | ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 334 | vma->vm_end - vma->vm_start, vma->vm_page_prot); |
| 335 | |
| 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | /* This provides legacy IO read access on a bus */ |
| 340 | int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) |
| 341 | { |
| 342 | unsigned long offset; |
| 343 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 344 | struct resource *rp = &hose->io_resource; |
| 345 | void __iomem *addr; |
| 346 | |
| 347 | /* Check if port can be supported by that bus. We only check |
| 348 | * the ranges of the PHB though, not the bus itself as the rules |
| 349 | * for forwarding legacy cycles down bridges are not our problem |
| 350 | * here. So if the host bridge supports it, we do it. |
| 351 | */ |
| 352 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 353 | offset += port; |
| 354 | |
| 355 | if (!(rp->flags & IORESOURCE_IO)) |
| 356 | return -ENXIO; |
| 357 | if (offset < rp->start || (offset + size) > rp->end) |
| 358 | return -ENXIO; |
| 359 | addr = hose->io_base_virt + port; |
| 360 | |
| 361 | switch (size) { |
| 362 | case 1: |
| 363 | *((u8 *)val) = in_8(addr); |
| 364 | return 1; |
| 365 | case 2: |
| 366 | if (port & 1) |
| 367 | return -EINVAL; |
| 368 | *((u16 *)val) = in_le16(addr); |
| 369 | return 2; |
| 370 | case 4: |
| 371 | if (port & 3) |
| 372 | return -EINVAL; |
| 373 | *((u32 *)val) = in_le32(addr); |
| 374 | return 4; |
| 375 | } |
| 376 | return -EINVAL; |
| 377 | } |
| 378 | |
| 379 | /* This provides legacy IO write access on a bus */ |
| 380 | int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) |
| 381 | { |
| 382 | unsigned long offset; |
| 383 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 384 | struct resource *rp = &hose->io_resource; |
| 385 | void __iomem *addr; |
| 386 | |
| 387 | /* Check if port can be supported by that bus. We only check |
| 388 | * the ranges of the PHB though, not the bus itself as the rules |
| 389 | * for forwarding legacy cycles down bridges are not our problem |
| 390 | * here. So if the host bridge supports it, we do it. |
| 391 | */ |
| 392 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 393 | offset += port; |
| 394 | |
| 395 | if (!(rp->flags & IORESOURCE_IO)) |
| 396 | return -ENXIO; |
| 397 | if (offset < rp->start || (offset + size) > rp->end) |
| 398 | return -ENXIO; |
| 399 | addr = hose->io_base_virt + port; |
| 400 | |
| 401 | /* WARNING: The generic code is idiotic. It gets passed a pointer |
| 402 | * to what can be a 1, 2 or 4 byte quantity and always reads that |
| 403 | * as a u32, which means that we have to correct the location of |
| 404 | * the data read within those 32 bits for size 1 and 2 |
| 405 | */ |
| 406 | switch (size) { |
| 407 | case 1: |
| 408 | out_8(addr, val >> 24); |
| 409 | return 1; |
| 410 | case 2: |
| 411 | if (port & 1) |
| 412 | return -EINVAL; |
| 413 | out_le16(addr, val >> 16); |
| 414 | return 2; |
| 415 | case 4: |
| 416 | if (port & 3) |
| 417 | return -EINVAL; |
| 418 | out_le32(addr, val); |
| 419 | return 4; |
| 420 | } |
| 421 | return -EINVAL; |
| 422 | } |
| 423 | |
| 424 | /* This provides legacy IO or memory mmap access on a bus */ |
| 425 | int pci_mmap_legacy_page_range(struct pci_bus *bus, |
| 426 | struct vm_area_struct *vma, |
| 427 | enum pci_mmap_state mmap_state) |
| 428 | { |
| 429 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 430 | resource_size_t offset = |
| 431 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; |
| 432 | resource_size_t size = vma->vm_end - vma->vm_start; |
| 433 | struct resource *rp; |
| 434 | |
| 435 | pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", |
| 436 | pci_domain_nr(bus), bus->number, |
| 437 | mmap_state == pci_mmap_mem ? "MEM" : "IO", |
| 438 | (unsigned long long)offset, |
| 439 | (unsigned long long)(offset + size - 1)); |
| 440 | |
| 441 | if (mmap_state == pci_mmap_mem) { |
| 442 | /* Hack alert ! |
| 443 | * |
| 444 | * Because X is lame and can fail starting if it gets an error |
| 445 | * trying to mmap legacy_mem (instead of just moving on without |
| 446 | * legacy memory access) we fake it here by giving it anonymous |
| 447 | * memory, effectively behaving just like /dev/zero |
| 448 | */ |
| 449 | if ((offset + size) > hose->isa_mem_size) { |
Michal Simek | 79bf3a1 | 2010-01-20 15:17:08 +0100 | [diff] [blame] | 450 | #ifdef CONFIG_MMU |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 451 | pr_debug("Process %s (pid:%d) mapped non-existing PCI", |
| 452 | current->comm, current->pid); |
| 453 | pr_debug("legacy memory for 0%04x:%02x\n", |
| 454 | pci_domain_nr(bus), bus->number); |
Michal Simek | 79bf3a1 | 2010-01-20 15:17:08 +0100 | [diff] [blame] | 455 | #endif |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 456 | if (vma->vm_flags & VM_SHARED) |
| 457 | return shmem_zero_setup(vma); |
| 458 | return 0; |
| 459 | } |
| 460 | offset += hose->isa_mem_phys; |
| 461 | } else { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 462 | unsigned long io_offset = (unsigned long)hose->io_base_virt - |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 463 | _IO_BASE; |
| 464 | unsigned long roffset = offset + io_offset; |
| 465 | rp = &hose->io_resource; |
| 466 | if (!(rp->flags & IORESOURCE_IO)) |
| 467 | return -ENXIO; |
| 468 | if (roffset < rp->start || (roffset + size) > rp->end) |
| 469 | return -ENXIO; |
| 470 | offset += hose->io_base_phys; |
| 471 | } |
| 472 | pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); |
| 473 | |
| 474 | vma->vm_pgoff = offset >> PAGE_SHIFT; |
| 475 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
| 476 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 477 | vma->vm_end - vma->vm_start, |
| 478 | vma->vm_page_prot); |
| 479 | } |
| 480 | |
| 481 | void pci_resource_to_user(const struct pci_dev *dev, int bar, |
| 482 | const struct resource *rsrc, |
| 483 | resource_size_t *start, resource_size_t *end) |
| 484 | { |
| 485 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 486 | resource_size_t offset = 0; |
| 487 | |
| 488 | if (hose == NULL) |
| 489 | return; |
| 490 | |
| 491 | if (rsrc->flags & IORESOURCE_IO) |
| 492 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 493 | |
| 494 | /* We pass a fully fixed up address to userland for MMIO instead of |
| 495 | * a BAR value because X is lame and expects to be able to use that |
| 496 | * to pass to /dev/mem ! |
| 497 | * |
| 498 | * That means that we'll have potentially 64 bits values where some |
| 499 | * userland apps only expect 32 (like X itself since it thinks only |
| 500 | * Sparc has 64 bits MMIO) but if we don't do that, we break it on |
| 501 | * 32 bits CHRPs :-( |
| 502 | * |
| 503 | * Hopefully, the sysfs insterface is immune to that gunk. Once X |
| 504 | * has been fixed (and the fix spread enough), we can re-enable the |
| 505 | * 2 lines below and pass down a BAR value to userland. In that case |
| 506 | * we'll also have to re-enable the matching code in |
| 507 | * __pci_mmap_make_offset(). |
| 508 | * |
| 509 | * BenH. |
| 510 | */ |
| 511 | #if 0 |
| 512 | else if (rsrc->flags & IORESOURCE_MEM) |
| 513 | offset = hose->pci_mem_offset; |
| 514 | #endif |
| 515 | |
| 516 | *start = rsrc->start - offset; |
| 517 | *end = rsrc->end - offset; |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree |
| 522 | * @hose: newly allocated pci_controller to be setup |
| 523 | * @dev: device node of the host bridge |
| 524 | * @primary: set if primary bus (32 bits only, soon to be deprecated) |
| 525 | * |
| 526 | * This function will parse the "ranges" property of a PCI host bridge device |
| 527 | * node and setup the resource mapping of a pci controller based on its |
| 528 | * content. |
| 529 | * |
| 530 | * Life would be boring if it wasn't for a few issues that we have to deal |
| 531 | * with here: |
| 532 | * |
| 533 | * - We can only cope with one IO space range and up to 3 Memory space |
| 534 | * ranges. However, some machines (thanks Apple !) tend to split their |
| 535 | * space into lots of small contiguous ranges. So we have to coalesce. |
| 536 | * |
| 537 | * - We can only cope with all memory ranges having the same offset |
| 538 | * between CPU addresses and PCI addresses. Unfortunately, some bridges |
| 539 | * are setup for a large 1:1 mapping along with a small "window" which |
| 540 | * maps PCI address 0 to some arbitrary high address of the CPU space in |
| 541 | * order to give access to the ISA memory hole. |
| 542 | * The way out of here that I've chosen for now is to always set the |
| 543 | * offset based on the first resource found, then override it if we |
| 544 | * have a different offset and the previous was set by an ISA hole. |
| 545 | * |
| 546 | * - Some busses have IO space not starting at 0, which causes trouble with |
| 547 | * the way we do our IO resource renumbering. The code somewhat deals with |
| 548 | * it for 64 bits but I would expect problems on 32 bits. |
| 549 | * |
| 550 | * - Some 32 bits platforms such as 4xx can have physical space larger than |
| 551 | * 32 bits so we need to use 64 bits values for the parsing |
| 552 | */ |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 553 | void pci_process_bridge_OF_ranges(struct pci_controller *hose, |
| 554 | struct device_node *dev, int primary) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 555 | { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 556 | int memno = 0, isa_hole = -1; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 557 | unsigned long long isa_mb = 0; |
| 558 | struct resource *res; |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 559 | struct of_pci_range range; |
| 560 | struct of_pci_range_parser parser; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 561 | |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 562 | pr_info("PCI host bridge %s %s ranges:\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 563 | dev->full_name, primary ? "(primary)" : ""); |
| 564 | |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 565 | /* Check for ranges property */ |
| 566 | if (of_pci_range_parser_init(&parser, dev)) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 567 | return; |
| 568 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 569 | pr_debug("Parsing ranges property...\n"); |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 570 | for_each_of_pci_range(&parser, &range) { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 571 | /* Read next ranges element */ |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 572 | pr_debug("pci_space: 0x%08x pci_addr:0x%016llx ", |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 573 | range.pci_space, range.pci_addr); |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 574 | pr_debug("cpu_addr:0x%016llx size:0x%016llx\n", |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 575 | range.cpu_addr, range.size); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 576 | |
| 577 | /* If we failed translation or got a zero-sized region |
| 578 | * (some FW try to feed us with non sensical zero sized regions |
| 579 | * such as power3 which look like some kind of attempt |
| 580 | * at exposing the VGA memory hole) |
| 581 | */ |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 582 | if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 583 | continue; |
| 584 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 585 | /* Act based on address space type */ |
| 586 | res = NULL; |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 587 | switch (range.flags & IORESOURCE_TYPE_BITS) { |
| 588 | case IORESOURCE_IO: |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 589 | pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n", |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 590 | range.cpu_addr, range.cpu_addr + range.size - 1, |
| 591 | range.pci_addr); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 592 | |
| 593 | /* We support only one IO range */ |
| 594 | if (hose->pci_io_size) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 595 | pr_info(" \\--> Skipped (too many) !\n"); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 596 | continue; |
| 597 | } |
| 598 | /* On 32 bits, limit I/O space to 16MB */ |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 599 | if (range.size > 0x01000000) |
| 600 | range.size = 0x01000000; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 601 | |
| 602 | /* 32 bits needs to map IOs here */ |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 603 | hose->io_base_virt = ioremap(range.cpu_addr, |
| 604 | range.size); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 605 | |
| 606 | /* Expect trouble if pci_addr is not 0 */ |
| 607 | if (primary) |
| 608 | isa_io_base = |
| 609 | (unsigned long)hose->io_base_virt; |
| 610 | /* pci_io_size and io_base_phys always represent IO |
| 611 | * space starting at 0 so we factor in pci_addr |
| 612 | */ |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 613 | hose->pci_io_size = range.pci_addr + range.size; |
| 614 | hose->io_base_phys = range.cpu_addr - range.pci_addr; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 615 | |
| 616 | /* Build resource */ |
| 617 | res = &hose->io_resource; |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 618 | range.cpu_addr = range.pci_addr; |
| 619 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 620 | break; |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 621 | case IORESOURCE_MEM: |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 622 | pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 623 | range.cpu_addr, range.cpu_addr + range.size - 1, |
| 624 | range.pci_addr, |
| 625 | (range.pci_space & 0x40000000) ? |
| 626 | "Prefetch" : ""); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 627 | |
| 628 | /* We support only 3 memory ranges */ |
| 629 | if (memno >= 3) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 630 | pr_info(" \\--> Skipped (too many) !\n"); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 631 | continue; |
| 632 | } |
| 633 | /* Handles ISA memory hole space here */ |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 634 | if (range.pci_addr == 0) { |
| 635 | isa_mb = range.cpu_addr; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 636 | isa_hole = memno; |
| 637 | if (primary || isa_mem_base == 0) |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 638 | isa_mem_base = range.cpu_addr; |
| 639 | hose->isa_mem_phys = range.cpu_addr; |
| 640 | hose->isa_mem_size = range.size; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 641 | } |
| 642 | |
| 643 | /* We get the PCI/Mem offset from the first range or |
| 644 | * the, current one if the offset came from an ISA |
| 645 | * hole. If they don't match, bugger. |
| 646 | */ |
| 647 | if (memno == 0 || |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 648 | (isa_hole >= 0 && range.pci_addr != 0 && |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 649 | hose->pci_mem_offset == isa_mb)) |
Andrew Murray | 4f7b6de | 2013-07-27 20:01:22 +0100 | [diff] [blame] | 650 | hose->pci_mem_offset = range.cpu_addr - |
| 651 | range.pci_addr; |
| 652 | else if (range.pci_addr != 0 && |
| 653 | hose->pci_mem_offset != range.cpu_addr - |
| 654 | range.pci_addr) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 655 | pr_info(" \\--> Skipped (offset mismatch) !\n"); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 656 | continue; |
| 657 | } |
| 658 | |
| 659 | /* Build resource */ |
| 660 | res = &hose->mem_resources[memno++]; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 661 | break; |
| 662 | } |
Michal Simek | 70dcd94 | 2014-10-27 08:15:25 +0100 | [diff] [blame] | 663 | if (res != NULL) { |
| 664 | res->name = dev->full_name; |
| 665 | res->flags = range.flags; |
| 666 | res->start = range.cpu_addr; |
| 667 | res->end = range.cpu_addr + range.size - 1; |
| 668 | res->parent = res->child = res->sibling = NULL; |
| 669 | } |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | /* If there's an ISA hole and the pci_mem_offset is -not- matching |
| 673 | * the ISA hole offset, then we need to remove the ISA hole from |
| 674 | * the resource list for that brige |
| 675 | */ |
| 676 | if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) { |
| 677 | unsigned int next = isa_hole + 1; |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 678 | pr_info(" Removing ISA hole at 0x%016llx\n", isa_mb); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 679 | if (next < memno) |
| 680 | memmove(&hose->mem_resources[isa_hole], |
| 681 | &hose->mem_resources[next], |
| 682 | sizeof(struct resource) * (memno - next)); |
| 683 | hose->mem_resources[--memno].flags = 0; |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | /* Decide whether to display the domain number in /proc */ |
| 688 | int pci_proc_domain(struct pci_bus *bus) |
| 689 | { |
Bjorn Helgaas | e5b3684 | 2012-02-23 20:18:57 -0700 | [diff] [blame] | 690 | return 0; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 691 | } |
| 692 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 693 | /* This header fixup will do the resource fixup for all devices as they are |
| 694 | * probed, but not for bridge ranges |
| 695 | */ |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 696 | static void pcibios_fixup_resources(struct pci_dev *dev) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 697 | { |
| 698 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 699 | int i; |
| 700 | |
| 701 | if (!hose) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 702 | pr_err("No host bridge for PCI dev %s !\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 703 | pci_name(dev)); |
| 704 | return; |
| 705 | } |
| 706 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
| 707 | struct resource *res = dev->resource + i; |
| 708 | if (!res->flags) |
| 709 | continue; |
Bjorn Helgaas | e5b3684 | 2012-02-23 20:18:57 -0700 | [diff] [blame] | 710 | if (res->start == 0) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 711 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 712 | pci_name(dev), i, |
| 713 | (unsigned long long)res->start, |
| 714 | (unsigned long long)res->end, |
| 715 | (unsigned int)res->flags); |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 716 | pr_debug("is unassigned\n"); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 717 | res->end -= res->start; |
| 718 | res->start = 0; |
| 719 | res->flags |= IORESOURCE_UNSET; |
| 720 | continue; |
| 721 | } |
| 722 | |
Bjorn Helgaas | aa23bdc | 2012-02-23 20:19:02 -0700 | [diff] [blame] | 723 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 724 | pci_name(dev), i, |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 725 | (unsigned long long)res->start, |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 726 | (unsigned long long)res->end, |
| 727 | (unsigned int)res->flags); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 728 | } |
| 729 | } |
| 730 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); |
| 731 | |
| 732 | /* This function tries to figure out if a bridge resource has been initialized |
| 733 | * by the firmware or not. It doesn't have to be absolutely bullet proof, but |
| 734 | * things go more smoothly when it gets it right. It should covers cases such |
| 735 | * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges |
| 736 | */ |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 737 | static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus, |
| 738 | struct resource *res) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 739 | { |
| 740 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 741 | struct pci_dev *dev = bus->self; |
| 742 | resource_size_t offset; |
| 743 | u16 command; |
| 744 | int i; |
| 745 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 746 | /* Job is a bit different between memory and IO */ |
| 747 | if (res->flags & IORESOURCE_MEM) { |
| 748 | /* If the BAR is non-0 (res != pci_mem_offset) then it's |
| 749 | * probably been initialized by somebody |
| 750 | */ |
| 751 | if (res->start != hose->pci_mem_offset) |
| 752 | return 0; |
| 753 | |
| 754 | /* The BAR is 0, let's check if memory decoding is enabled on |
| 755 | * the bridge. If not, we consider it unassigned |
| 756 | */ |
| 757 | pci_read_config_word(dev, PCI_COMMAND, &command); |
| 758 | if ((command & PCI_COMMAND_MEMORY) == 0) |
| 759 | return 1; |
| 760 | |
| 761 | /* Memory decoding is enabled and the BAR is 0. If any of |
| 762 | * the bridge resources covers that starting address (0 then |
| 763 | * it's good enough for us for memory |
| 764 | */ |
| 765 | for (i = 0; i < 3; i++) { |
| 766 | if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && |
| 767 | hose->mem_resources[i].start == hose->pci_mem_offset) |
| 768 | return 0; |
| 769 | } |
| 770 | |
| 771 | /* Well, it starts at 0 and we know it will collide so we may as |
| 772 | * well consider it as unassigned. That covers the Apple case. |
| 773 | */ |
| 774 | return 1; |
| 775 | } else { |
| 776 | /* If the BAR is non-0, then we consider it assigned */ |
| 777 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 778 | if (((res->start - offset) & 0xfffffffful) != 0) |
| 779 | return 0; |
| 780 | |
| 781 | /* Here, we are a bit different than memory as typically IO |
| 782 | * space starting at low addresses -is- valid. What we do |
| 783 | * instead if that we consider as unassigned anything that |
| 784 | * doesn't have IO enabled in the PCI command register, |
| 785 | * and that's it. |
| 786 | */ |
| 787 | pci_read_config_word(dev, PCI_COMMAND, &command); |
| 788 | if (command & PCI_COMMAND_IO) |
| 789 | return 0; |
| 790 | |
| 791 | /* It's starting at 0 and IO is disabled in the bridge, consider |
| 792 | * it unassigned |
| 793 | */ |
| 794 | return 1; |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | /* Fixup resources of a PCI<->PCI bridge */ |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 799 | static void pcibios_fixup_bridge(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 800 | { |
| 801 | struct resource *res; |
| 802 | int i; |
| 803 | |
| 804 | struct pci_dev *dev = bus->self; |
| 805 | |
Michal Simek | 8a66da7 | 2010-04-16 09:03:00 +0200 | [diff] [blame] | 806 | pci_bus_for_each_resource(bus, res, i) { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 807 | if (!res) |
| 808 | continue; |
| 809 | if (!res->flags) |
| 810 | continue; |
| 811 | if (i >= 3 && bus->self->transparent) |
| 812 | continue; |
| 813 | |
| 814 | pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n", |
| 815 | pci_name(dev), i, |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 816 | (unsigned long long)res->start, |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 817 | (unsigned long long)res->end, |
| 818 | (unsigned int)res->flags); |
| 819 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 820 | /* Try to detect uninitialized P2P bridge resources, |
| 821 | * and clear them out so they get re-assigned later |
| 822 | */ |
| 823 | if (pcibios_uninitialized_bridge_resource(bus, res)) { |
| 824 | res->flags = 0; |
| 825 | pr_debug("PCI:%s (unassigned)\n", |
| 826 | pci_name(dev)); |
| 827 | } else { |
| 828 | pr_debug("PCI:%s %016llx-%016llx\n", |
| 829 | pci_name(dev), |
| 830 | (unsigned long long)res->start, |
| 831 | (unsigned long long)res->end); |
| 832 | } |
| 833 | } |
| 834 | } |
| 835 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 836 | void pcibios_setup_bus_self(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 837 | { |
| 838 | /* Fix up the bus resources for P2P bridges */ |
| 839 | if (bus->self != NULL) |
| 840 | pcibios_fixup_bridge(bus); |
| 841 | } |
| 842 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 843 | void pcibios_setup_bus_devices(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 844 | { |
| 845 | struct pci_dev *dev; |
| 846 | |
| 847 | pr_debug("PCI: Fixup bus devices %d (%s)\n", |
| 848 | bus->number, bus->self ? pci_name(bus->self) : "PHB"); |
| 849 | |
| 850 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 851 | /* Setup OF node pointer in archdata */ |
Michal Simek | 088ab30 | 2010-08-16 10:31:54 +0200 | [diff] [blame] | 852 | dev->dev.of_node = pci_device_to_OF_node(dev); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 853 | |
| 854 | /* Fixup NUMA node as it may not be setup yet by the generic |
| 855 | * code and is needed by the DMA init |
| 856 | */ |
| 857 | set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); |
| 858 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 859 | /* Read default IRQs and fixup if necessary */ |
Grant Likely | f27446c | 2013-09-19 23:34:26 -0500 | [diff] [blame] | 860 | dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 861 | } |
| 862 | } |
| 863 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 864 | void pcibios_fixup_bus(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 865 | { |
Lorenzo Pieralisi | dff22d2 | 2015-07-09 11:59:16 +0100 | [diff] [blame] | 866 | /* Fixup the bus */ |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 867 | pcibios_setup_bus_self(bus); |
| 868 | |
| 869 | /* Now fixup devices on that bus */ |
| 870 | pcibios_setup_bus_devices(bus); |
| 871 | } |
| 872 | EXPORT_SYMBOL(pcibios_fixup_bus); |
| 873 | |
| 874 | static int skip_isa_ioresource_align(struct pci_dev *dev) |
| 875 | { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * We need to avoid collisions with `mirrored' VGA ports |
| 881 | * and other strange ISA hardware, so we always want the |
| 882 | * addresses to be allocated in the 0x000-0x0ff region |
| 883 | * modulo 0x400. |
| 884 | * |
| 885 | * Why? Because some silly external IO cards only decode |
| 886 | * the low 10 bits of the IO address. The 0x00-0xff region |
| 887 | * is reserved for motherboard devices that decode all 16 |
| 888 | * bits, so it's ok to allocate at, say, 0x2800-0x28ff, |
| 889 | * but we want to try to avoid allocating at 0x2900-0x2bff |
| 890 | * which might have be mirrored at 0x0100-0x03ff.. |
| 891 | */ |
Michal Simek | c86fac4 | 2010-04-16 09:04:51 +0200 | [diff] [blame] | 892 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 893 | resource_size_t size, resource_size_t align) |
| 894 | { |
| 895 | struct pci_dev *dev = data; |
Michal Simek | c86fac4 | 2010-04-16 09:04:51 +0200 | [diff] [blame] | 896 | resource_size_t start = res->start; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 897 | |
| 898 | if (res->flags & IORESOURCE_IO) { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 899 | if (skip_isa_ioresource_align(dev)) |
Michal Simek | c86fac4 | 2010-04-16 09:04:51 +0200 | [diff] [blame] | 900 | return start; |
| 901 | if (start & 0x300) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 902 | start = (start + 0x3ff) & ~0x3ff; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 903 | } |
Michal Simek | c86fac4 | 2010-04-16 09:04:51 +0200 | [diff] [blame] | 904 | |
| 905 | return start; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 906 | } |
| 907 | EXPORT_SYMBOL(pcibios_align_resource); |
| 908 | |
| 909 | /* |
| 910 | * Reparent resource children of pr that conflict with res |
| 911 | * under res, and make res replace those children. |
| 912 | */ |
| 913 | static int __init reparent_resources(struct resource *parent, |
| 914 | struct resource *res) |
| 915 | { |
| 916 | struct resource *p, **pp; |
| 917 | struct resource **firstpp = NULL; |
| 918 | |
| 919 | for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { |
| 920 | if (p->end < res->start) |
| 921 | continue; |
| 922 | if (res->end < p->start) |
| 923 | break; |
| 924 | if (p->start < res->start || p->end > res->end) |
| 925 | return -1; /* not completely contained */ |
| 926 | if (firstpp == NULL) |
| 927 | firstpp = pp; |
| 928 | } |
| 929 | if (firstpp == NULL) |
| 930 | return -1; /* didn't find any conflicting entries? */ |
| 931 | res->parent = parent; |
| 932 | res->child = *firstpp; |
| 933 | res->sibling = *pp; |
| 934 | *firstpp = res; |
| 935 | *pp = NULL; |
| 936 | for (p = res->child; p != NULL; p = p->sibling) { |
| 937 | p->parent = res; |
| 938 | pr_debug("PCI: Reparented %s [%llx..%llx] under %s\n", |
| 939 | p->name, |
| 940 | (unsigned long long)p->start, |
| 941 | (unsigned long long)p->end, res->name); |
| 942 | } |
| 943 | return 0; |
| 944 | } |
| 945 | |
| 946 | /* |
| 947 | * Handle resources of PCI devices. If the world were perfect, we could |
| 948 | * just allocate all the resource regions and do nothing more. It isn't. |
| 949 | * On the other hand, we cannot just re-allocate all devices, as it would |
| 950 | * require us to know lots of host bridge internals. So we attempt to |
| 951 | * keep as much of the original configuration as possible, but tweak it |
| 952 | * when it's found to be wrong. |
| 953 | * |
| 954 | * Known BIOS problems we have to work around: |
| 955 | * - I/O or memory regions not configured |
| 956 | * - regions configured, but not enabled in the command register |
| 957 | * - bogus I/O addresses above 64K used |
| 958 | * - expansion ROMs left enabled (this may sound harmless, but given |
| 959 | * the fact the PCI specs explicitly allow address decoders to be |
| 960 | * shared between expansion ROMs and other resource regions, it's |
| 961 | * at least dangerous) |
| 962 | * |
| 963 | * Our solution: |
| 964 | * (1) Allocate resources for all buses behind PCI-to-PCI bridges. |
| 965 | * This gives us fixed barriers on where we can allocate. |
| 966 | * (2) Allocate resources for all enabled devices. If there is |
| 967 | * a collision, just mark the resource as unallocated. Also |
| 968 | * disable expansion ROMs during this step. |
| 969 | * (3) Try to allocate resources for disabled devices. If the |
| 970 | * resources were assigned correctly, everything goes well, |
| 971 | * if they weren't, they won't disturb allocation of other |
| 972 | * resources. |
| 973 | * (4) Assign new addresses to resources which were either |
| 974 | * not configured at all or misconfigured. If explicitly |
| 975 | * requested by the user, configure expansion ROM address |
| 976 | * as well. |
| 977 | */ |
| 978 | |
Michal Simek | f7eaacc | 2013-01-04 09:14:46 +0100 | [diff] [blame] | 979 | static void pcibios_allocate_bus_resources(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 980 | { |
| 981 | struct pci_bus *b; |
| 982 | int i; |
| 983 | struct resource *res, *pr; |
| 984 | |
| 985 | pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", |
| 986 | pci_domain_nr(bus), bus->number); |
| 987 | |
Michal Simek | 8a66da7 | 2010-04-16 09:03:00 +0200 | [diff] [blame] | 988 | pci_bus_for_each_resource(bus, res, i) { |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 989 | if (!res || !res->flags |
| 990 | || res->start > res->end || res->parent) |
| 991 | continue; |
| 992 | if (bus->parent == NULL) |
| 993 | pr = (res->flags & IORESOURCE_IO) ? |
| 994 | &ioport_resource : &iomem_resource; |
| 995 | else { |
| 996 | /* Don't bother with non-root busses when |
| 997 | * re-assigning all resources. We clear the |
| 998 | * resource flags as if they were colliding |
| 999 | * and as such ensure proper re-allocation |
| 1000 | * later. |
| 1001 | */ |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1002 | pr = pci_find_parent_resource(bus->self, res); |
| 1003 | if (pr == res) { |
| 1004 | /* this happens when the generic PCI |
| 1005 | * code (wrongly) decides that this |
| 1006 | * bridge is transparent -- paulus |
| 1007 | */ |
| 1008 | continue; |
| 1009 | } |
| 1010 | } |
| 1011 | |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1012 | pr_debug("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx ", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1013 | bus->self ? pci_name(bus->self) : "PHB", |
| 1014 | bus->number, i, |
| 1015 | (unsigned long long)res->start, |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1016 | (unsigned long long)res->end); |
| 1017 | pr_debug("[0x%x], parent %p (%s)\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1018 | (unsigned int)res->flags, |
| 1019 | pr, (pr && pr->name) ? pr->name : "nil"); |
| 1020 | |
| 1021 | if (pr && !(pr->flags & IORESOURCE_UNSET)) { |
Yinghai Lu | 576e438 | 2015-01-15 16:21:50 -0600 | [diff] [blame] | 1022 | struct pci_dev *dev = bus->self; |
| 1023 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1024 | if (request_resource(pr, res) == 0) |
| 1025 | continue; |
| 1026 | /* |
| 1027 | * Must be a conflict with an existing entry. |
| 1028 | * Move that entry (or entries) under the |
| 1029 | * bridge resource and try again. |
| 1030 | */ |
| 1031 | if (reparent_resources(pr, res) == 0) |
| 1032 | continue; |
Yinghai Lu | 576e438 | 2015-01-15 16:21:50 -0600 | [diff] [blame] | 1033 | |
| 1034 | if (dev && i < PCI_BRIDGE_RESOURCE_NUM && |
| 1035 | pci_claim_bridge_resource(dev, |
| 1036 | i + PCI_BRIDGE_RESOURCES) == 0) |
| 1037 | continue; |
| 1038 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1039 | } |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1040 | pr_warn("PCI: Cannot allocate resource region "); |
| 1041 | pr_cont("%d of PCI bridge %d, will remap\n", i, bus->number); |
Yinghai Lu | 837c4ef | 2010-06-03 13:43:03 -0700 | [diff] [blame] | 1042 | res->start = res->end = 0; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1043 | res->flags = 0; |
| 1044 | } |
| 1045 | |
| 1046 | list_for_each_entry(b, &bus->children, node) |
| 1047 | pcibios_allocate_bus_resources(b); |
| 1048 | } |
| 1049 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 1050 | static inline void alloc_resource(struct pci_dev *dev, int idx) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1051 | { |
| 1052 | struct resource *pr, *r = &dev->resource[idx]; |
| 1053 | |
| 1054 | pr_debug("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n", |
| 1055 | pci_name(dev), idx, |
| 1056 | (unsigned long long)r->start, |
| 1057 | (unsigned long long)r->end, |
| 1058 | (unsigned int)r->flags); |
| 1059 | |
| 1060 | pr = pci_find_parent_resource(dev, r); |
| 1061 | if (!pr || (pr->flags & IORESOURCE_UNSET) || |
| 1062 | request_resource(pr, r) < 0) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1063 | pr_warn("PCI: Cannot allocate resource region %d ", idx); |
| 1064 | pr_cont("of device %s, will remap\n", pci_name(dev)); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1065 | if (pr) |
| 1066 | pr_debug("PCI: parent is %p: %016llx-%016llx [%x]\n", |
| 1067 | pr, |
| 1068 | (unsigned long long)pr->start, |
| 1069 | (unsigned long long)pr->end, |
| 1070 | (unsigned int)pr->flags); |
| 1071 | /* We'll assign a new address later */ |
| 1072 | r->flags |= IORESOURCE_UNSET; |
| 1073 | r->end -= r->start; |
| 1074 | r->start = 0; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | static void __init pcibios_allocate_resources(int pass) |
| 1079 | { |
| 1080 | struct pci_dev *dev = NULL; |
| 1081 | int idx, disabled; |
| 1082 | u16 command; |
| 1083 | struct resource *r; |
| 1084 | |
| 1085 | for_each_pci_dev(dev) { |
| 1086 | pci_read_config_word(dev, PCI_COMMAND, &command); |
| 1087 | for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { |
| 1088 | r = &dev->resource[idx]; |
| 1089 | if (r->parent) /* Already allocated */ |
| 1090 | continue; |
| 1091 | if (!r->flags || (r->flags & IORESOURCE_UNSET)) |
| 1092 | continue; /* Not assigned at all */ |
| 1093 | /* We only allocate ROMs on pass 1 just in case they |
| 1094 | * have been screwed up by firmware |
| 1095 | */ |
| 1096 | if (idx == PCI_ROM_RESOURCE) |
| 1097 | disabled = 1; |
| 1098 | if (r->flags & IORESOURCE_IO) |
| 1099 | disabled = !(command & PCI_COMMAND_IO); |
| 1100 | else |
| 1101 | disabled = !(command & PCI_COMMAND_MEMORY); |
| 1102 | if (pass == disabled) |
| 1103 | alloc_resource(dev, idx); |
| 1104 | } |
| 1105 | if (pass) |
| 1106 | continue; |
| 1107 | r = &dev->resource[PCI_ROM_RESOURCE]; |
| 1108 | if (r->flags) { |
| 1109 | /* Turn the ROM off, leave the resource region, |
| 1110 | * but keep it unregistered. |
| 1111 | */ |
| 1112 | u32 reg; |
| 1113 | pci_read_config_dword(dev, dev->rom_base_reg, ®); |
| 1114 | if (reg & PCI_ROM_ADDRESS_ENABLE) { |
| 1115 | pr_debug("PCI: Switching off ROM of %s\n", |
| 1116 | pci_name(dev)); |
| 1117 | r->flags &= ~IORESOURCE_ROM_ENABLE; |
| 1118 | pci_write_config_dword(dev, dev->rom_base_reg, |
| 1119 | reg & ~PCI_ROM_ADDRESS_ENABLE); |
| 1120 | } |
| 1121 | } |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) |
| 1126 | { |
| 1127 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 1128 | resource_size_t offset; |
| 1129 | struct resource *res, *pres; |
| 1130 | int i; |
| 1131 | |
| 1132 | pr_debug("Reserving legacy ranges for domain %04x\n", |
| 1133 | pci_domain_nr(bus)); |
| 1134 | |
| 1135 | /* Check for IO */ |
| 1136 | if (!(hose->io_resource.flags & IORESOURCE_IO)) |
| 1137 | goto no_io; |
| 1138 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 1139 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 1140 | BUG_ON(res == NULL); |
| 1141 | res->name = "Legacy IO"; |
| 1142 | res->flags = IORESOURCE_IO; |
| 1143 | res->start = offset; |
| 1144 | res->end = (offset + 0xfff) & 0xfffffffful; |
| 1145 | pr_debug("Candidate legacy IO: %pR\n", res); |
| 1146 | if (request_resource(&hose->io_resource, res)) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1147 | pr_debug("PCI %04x:%02x Cannot reserve Legacy IO %pR\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1148 | pci_domain_nr(bus), bus->number, res); |
| 1149 | kfree(res); |
| 1150 | } |
| 1151 | |
| 1152 | no_io: |
| 1153 | /* Check for memory */ |
| 1154 | offset = hose->pci_mem_offset; |
| 1155 | pr_debug("hose mem offset: %016llx\n", (unsigned long long)offset); |
| 1156 | for (i = 0; i < 3; i++) { |
| 1157 | pres = &hose->mem_resources[i]; |
| 1158 | if (!(pres->flags & IORESOURCE_MEM)) |
| 1159 | continue; |
| 1160 | pr_debug("hose mem res: %pR\n", pres); |
| 1161 | if ((pres->start - offset) <= 0xa0000 && |
| 1162 | (pres->end - offset) >= 0xbffff) |
| 1163 | break; |
| 1164 | } |
| 1165 | if (i >= 3) |
| 1166 | return; |
| 1167 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 1168 | BUG_ON(res == NULL); |
| 1169 | res->name = "Legacy VGA memory"; |
| 1170 | res->flags = IORESOURCE_MEM; |
| 1171 | res->start = 0xa0000 + offset; |
| 1172 | res->end = 0xbffff + offset; |
| 1173 | pr_debug("Candidate VGA memory: %pR\n", res); |
| 1174 | if (request_resource(pres, res)) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1175 | pr_debug("PCI %04x:%02x Cannot reserve VGA memory %pR\n", |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1176 | pci_domain_nr(bus), bus->number, res); |
| 1177 | kfree(res); |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | void __init pcibios_resource_survey(void) |
| 1182 | { |
| 1183 | struct pci_bus *b; |
| 1184 | |
| 1185 | /* Allocate and assign resources. If we re-assign everything, then |
| 1186 | * we skip the allocate phase |
| 1187 | */ |
| 1188 | list_for_each_entry(b, &pci_root_buses, node) |
| 1189 | pcibios_allocate_bus_resources(b); |
| 1190 | |
Bjorn Helgaas | e5b3684 | 2012-02-23 20:18:57 -0700 | [diff] [blame] | 1191 | pcibios_allocate_resources(0); |
| 1192 | pcibios_allocate_resources(1); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1193 | |
| 1194 | /* Before we start assigning unassigned resource, we try to reserve |
| 1195 | * the low IO area and the VGA memory area if they intersect the |
| 1196 | * bus available resources to avoid allocating things on top of them |
| 1197 | */ |
Bjorn Helgaas | e5b3684 | 2012-02-23 20:18:57 -0700 | [diff] [blame] | 1198 | list_for_each_entry(b, &pci_root_buses, node) |
| 1199 | pcibios_reserve_legacy_regions(b); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1200 | |
Bjorn Helgaas | e5b3684 | 2012-02-23 20:18:57 -0700 | [diff] [blame] | 1201 | /* Now proceed to assigning things that were left unassigned */ |
| 1202 | pr_debug("PCI: Assigning unassigned resources...\n"); |
| 1203 | pci_assign_unassigned_resources(); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1204 | } |
| 1205 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1206 | /* This is used by the PCI hotplug driver to allocate resource |
| 1207 | * of newly plugged busses. We can try to consolidate with the |
| 1208 | * rest of the code later, for now, keep it as-is as our main |
| 1209 | * resource allocation function doesn't deal with sub-trees yet. |
| 1210 | */ |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 1211 | void pcibios_claim_one_bus(struct pci_bus *bus) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1212 | { |
| 1213 | struct pci_dev *dev; |
| 1214 | struct pci_bus *child_bus; |
| 1215 | |
| 1216 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1217 | int i; |
| 1218 | |
| 1219 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 1220 | struct resource *r = &dev->resource[i]; |
| 1221 | |
| 1222 | if (r->parent || !r->start || !r->flags) |
| 1223 | continue; |
| 1224 | |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1225 | pr_debug("PCI: Claiming %s: ", pci_name(dev)); |
| 1226 | pr_debug("Resource %d: %016llx..%016llx [%x]\n", |
| 1227 | i, (unsigned long long)r->start, |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1228 | (unsigned long long)r->end, |
| 1229 | (unsigned int)r->flags); |
| 1230 | |
Yinghai Lu | 576e438 | 2015-01-15 16:21:50 -0600 | [diff] [blame] | 1231 | if (pci_claim_resource(dev, i) == 0) |
| 1232 | continue; |
| 1233 | |
| 1234 | pci_claim_bridge_resource(dev, i); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | list_for_each_entry(child_bus, &bus->children, node) |
| 1239 | pcibios_claim_one_bus(child_bus); |
| 1240 | } |
| 1241 | EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); |
| 1242 | |
| 1243 | |
| 1244 | /* pcibios_finish_adding_to_bus |
| 1245 | * |
| 1246 | * This is to be called by the hotplug code after devices have been |
| 1247 | * added to a bus, this include calling it for a PHB that is just |
| 1248 | * being added |
| 1249 | */ |
| 1250 | void pcibios_finish_adding_to_bus(struct pci_bus *bus) |
| 1251 | { |
| 1252 | pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", |
| 1253 | pci_domain_nr(bus), bus->number); |
| 1254 | |
| 1255 | /* Allocate bus and devices resources */ |
| 1256 | pcibios_allocate_bus_resources(bus); |
| 1257 | pcibios_claim_one_bus(bus); |
| 1258 | |
| 1259 | /* Add new devices to global lists. Register in proc, sysfs. */ |
| 1260 | pci_bus_add_devices(bus); |
| 1261 | |
| 1262 | /* Fixup EEH */ |
Michal Simek | 1ce2470 | 2010-05-13 12:09:54 +0200 | [diff] [blame] | 1263 | /* eeh_add_device_tree_late(bus); */ |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1264 | } |
| 1265 | EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); |
| 1266 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 1267 | static void pcibios_setup_phb_resources(struct pci_controller *hose, |
| 1268 | struct list_head *resources) |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1269 | { |
Bjorn Helgaas | 5420e46 | 2012-05-15 17:03:25 -0600 | [diff] [blame] | 1270 | unsigned long io_offset; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1271 | struct resource *res; |
| 1272 | int i; |
| 1273 | |
| 1274 | /* Hookup PHB IO resource */ |
Bjorn Helgaas | 58de74b | 2011-10-28 16:26:46 -0600 | [diff] [blame] | 1275 | res = &hose->io_resource; |
| 1276 | |
| 1277 | /* Fixup IO space offset */ |
| 1278 | io_offset = (unsigned long)hose->io_base_virt - isa_io_base; |
| 1279 | res->start = (res->start + io_offset) & 0xffffffffu; |
| 1280 | res->end = (res->end + io_offset) & 0xffffffffu; |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1281 | |
| 1282 | if (!res->flags) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1283 | pr_warn("PCI: I/O resource not set for host "); |
| 1284 | pr_cont("bridge %s (domain %d)\n", |
| 1285 | hose->dn->full_name, hose->global_number); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1286 | /* Workaround for lack of IO resource only on 32-bit */ |
| 1287 | res->start = (unsigned long)hose->io_base_virt - isa_io_base; |
| 1288 | res->end = res->start + IO_SPACE_LIMIT; |
| 1289 | res->flags = IORESOURCE_IO; |
| 1290 | } |
Michal Simek | f7eaacc | 2013-01-04 09:14:46 +0100 | [diff] [blame] | 1291 | pci_add_resource_offset(resources, res, |
| 1292 | (__force resource_size_t)(hose->io_base_virt - _IO_BASE)); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1293 | |
| 1294 | pr_debug("PCI: PHB IO resource = %016llx-%016llx [%lx]\n", |
| 1295 | (unsigned long long)res->start, |
| 1296 | (unsigned long long)res->end, |
| 1297 | (unsigned long)res->flags); |
| 1298 | |
| 1299 | /* Hookup PHB Memory resources */ |
| 1300 | for (i = 0; i < 3; ++i) { |
| 1301 | res = &hose->mem_resources[i]; |
| 1302 | if (!res->flags) { |
| 1303 | if (i > 0) |
| 1304 | continue; |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1305 | pr_err("PCI: Memory resource 0 not set for "); |
| 1306 | pr_cont("host bridge %s (domain %d)\n", |
| 1307 | hose->dn->full_name, hose->global_number); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1308 | |
| 1309 | /* Workaround for lack of MEM resource only on 32-bit */ |
| 1310 | res->start = hose->pci_mem_offset; |
| 1311 | res->end = (resource_size_t)-1LL; |
| 1312 | res->flags = IORESOURCE_MEM; |
| 1313 | |
| 1314 | } |
Bjorn Helgaas | aa23bdc | 2012-02-23 20:19:02 -0700 | [diff] [blame] | 1315 | pci_add_resource_offset(resources, res, hose->pci_mem_offset); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1316 | |
| 1317 | pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n", |
| 1318 | i, (unsigned long long)res->start, |
| 1319 | (unsigned long long)res->end, |
| 1320 | (unsigned long)res->flags); |
| 1321 | } |
| 1322 | |
| 1323 | pr_debug("PCI: PHB MEM offset = %016llx\n", |
| 1324 | (unsigned long long)hose->pci_mem_offset); |
| 1325 | pr_debug("PCI: PHB IO offset = %08lx\n", |
| 1326 | (unsigned long)hose->io_base_virt - _IO_BASE); |
| 1327 | } |
| 1328 | |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1329 | struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) |
| 1330 | { |
| 1331 | struct pci_controller *hose = bus->sysdata; |
| 1332 | |
| 1333 | return of_node_get(hose->dn); |
| 1334 | } |
| 1335 | |
Greg Kroah-Hartman | b881bc4 | 2012-12-21 14:06:37 -0800 | [diff] [blame] | 1336 | static void pcibios_scan_phb(struct pci_controller *hose) |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1337 | { |
Bjorn Helgaas | 58de74b | 2011-10-28 16:26:46 -0600 | [diff] [blame] | 1338 | LIST_HEAD(resources); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1339 | struct pci_bus *bus; |
| 1340 | struct device_node *node = hose->dn; |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1341 | |
Grant Likely | 74a7f08 | 2012-06-15 11:50:25 -0600 | [diff] [blame] | 1342 | pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1343 | |
Bjorn Helgaas | 58de74b | 2011-10-28 16:26:46 -0600 | [diff] [blame] | 1344 | pcibios_setup_phb_resources(hose, &resources); |
| 1345 | |
Bjorn Helgaas | 4723b98 | 2011-10-28 16:26:52 -0600 | [diff] [blame] | 1346 | bus = pci_scan_root_bus(hose->parent, hose->first_busno, |
| 1347 | hose->ops, hose, &resources); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1348 | if (bus == NULL) { |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1349 | pr_err("Failed to create bus for PCI domain %04x\n", |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1350 | hose->global_number); |
Bjorn Helgaas | 58de74b | 2011-10-28 16:26:46 -0600 | [diff] [blame] | 1351 | pci_free_resource_list(&resources); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1352 | return; |
| 1353 | } |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 1354 | bus->busn_res.start = hose->first_busno; |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1355 | hose->bus = bus; |
| 1356 | |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 1357 | hose->last_busno = bus->busn_res.end; |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1358 | } |
| 1359 | |
| 1360 | static int __init pcibios_init(void) |
| 1361 | { |
| 1362 | struct pci_controller *hose, *tmp; |
| 1363 | int next_busno = 0; |
| 1364 | |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1365 | pr_info("PCI: Probing PCI hardware\n"); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1366 | |
| 1367 | /* Scan all of the recorded PCI controllers. */ |
| 1368 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| 1369 | hose->last_busno = 0xff; |
| 1370 | pcibios_scan_phb(hose); |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1371 | if (next_busno <= hose->last_busno) |
| 1372 | next_busno = hose->last_busno + 1; |
| 1373 | } |
| 1374 | pci_bus_count = next_busno; |
| 1375 | |
| 1376 | /* Call common code to handle resource allocation */ |
| 1377 | pcibios_resource_survey(); |
Yijing Wang | b97ea28 | 2015-03-16 11:18:56 +0800 | [diff] [blame] | 1378 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| 1379 | if (hose->bus) |
| 1380 | pci_bus_add_devices(hose->bus); |
| 1381 | } |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1382 | |
| 1383 | return 0; |
| 1384 | } |
| 1385 | |
| 1386 | subsys_initcall(pcibios_init); |
| 1387 | |
| 1388 | static struct pci_controller *pci_bus_to_hose(int bus) |
| 1389 | { |
| 1390 | struct pci_controller *hose, *tmp; |
| 1391 | |
| 1392 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
| 1393 | if (bus >= hose->first_busno && bus <= hose->last_busno) |
| 1394 | return hose; |
| 1395 | return NULL; |
| 1396 | } |
| 1397 | |
| 1398 | /* Provide information on locations of various I/O regions in physical |
| 1399 | * memory. Do this on a per-card basis so that we choose the right |
| 1400 | * root bridge. |
| 1401 | * Note that the returned IO or memory base is a physical address |
| 1402 | */ |
| 1403 | |
| 1404 | long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) |
| 1405 | { |
| 1406 | struct pci_controller *hose; |
| 1407 | long result = -EOPNOTSUPP; |
| 1408 | |
| 1409 | hose = pci_bus_to_hose(bus); |
| 1410 | if (!hose) |
| 1411 | return -ENODEV; |
| 1412 | |
| 1413 | switch (which) { |
| 1414 | case IOBASE_BRIDGE_NUMBER: |
| 1415 | return (long)hose->first_busno; |
| 1416 | case IOBASE_MEMORY: |
| 1417 | return (long)hose->pci_mem_offset; |
| 1418 | case IOBASE_IO: |
| 1419 | return (long)hose->io_base_phys; |
| 1420 | case IOBASE_ISA_IO: |
| 1421 | return (long)isa_io_base; |
| 1422 | case IOBASE_ISA_MEM: |
| 1423 | return (long)isa_mem_base; |
| 1424 | } |
| 1425 | |
| 1426 | return result; |
| 1427 | } |
| 1428 | |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1429 | /* |
| 1430 | * Null PCI config access functions, for the case when we can't |
| 1431 | * find a hose. |
| 1432 | */ |
| 1433 | #define NULL_PCI_OP(rw, size, type) \ |
| 1434 | static int \ |
| 1435 | null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ |
| 1436 | { \ |
| 1437 | return PCIBIOS_DEVICE_NOT_FOUND; \ |
| 1438 | } |
| 1439 | |
| 1440 | static int |
| 1441 | null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, |
| 1442 | int len, u32 *val) |
| 1443 | { |
| 1444 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 1445 | } |
| 1446 | |
| 1447 | static int |
| 1448 | null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, |
| 1449 | int len, u32 val) |
| 1450 | { |
| 1451 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 1452 | } |
| 1453 | |
| 1454 | static struct pci_ops null_pci_ops = { |
| 1455 | .read = null_read_config, |
| 1456 | .write = null_write_config, |
| 1457 | }; |
| 1458 | |
| 1459 | /* |
| 1460 | * These functions are used early on before PCI scanning is done |
| 1461 | * and all of the pci_dev and pci_bus structures have been created. |
| 1462 | */ |
| 1463 | static struct pci_bus * |
| 1464 | fake_pci_bus(struct pci_controller *hose, int busnr) |
| 1465 | { |
| 1466 | static struct pci_bus bus; |
| 1467 | |
| 1468 | if (!hose) |
Michal Simek | 6bd55f0 | 2012-12-27 10:40:38 +0100 | [diff] [blame] | 1469 | pr_err("Can't find hose for PCI bus %d!\n", busnr); |
Michal Simek | d3afa58 | 2010-01-18 14:42:34 +0100 | [diff] [blame] | 1470 | |
| 1471 | bus.number = busnr; |
| 1472 | bus.sysdata = hose; |
| 1473 | bus.ops = hose ? hose->ops : &null_pci_ops; |
| 1474 | return &bus; |
| 1475 | } |
| 1476 | |
| 1477 | #define EARLY_PCI_OP(rw, size, type) \ |
| 1478 | int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ |
| 1479 | int devfn, int offset, type value) \ |
| 1480 | { \ |
| 1481 | return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ |
| 1482 | devfn, offset, value); \ |
| 1483 | } |
| 1484 | |
| 1485 | EARLY_PCI_OP(read, byte, u8 *) |
| 1486 | EARLY_PCI_OP(read, word, u16 *) |
| 1487 | EARLY_PCI_OP(read, dword, u32 *) |
| 1488 | EARLY_PCI_OP(write, byte, u8) |
| 1489 | EARLY_PCI_OP(write, word, u16) |
| 1490 | EARLY_PCI_OP(write, dword, u32) |
| 1491 | |
| 1492 | int early_find_capability(struct pci_controller *hose, int bus, int devfn, |
| 1493 | int cap) |
| 1494 | { |
| 1495 | return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); |
| 1496 | } |
Benjamin Herrenschmidt | bf13a6f | 2011-04-11 11:17:26 +1000 | [diff] [blame] | 1497 | |