Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * probe.c - PCI detection and setup code |
| 3 | */ |
| 4 | |
| 5 | #include <linux/kernel.h> |
| 6 | #include <linux/delay.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/pci.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/cpumask.h> |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 12 | #include <linux/pci-aspm.h> |
Greg KH | bc56b9e | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 13 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
| 15 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ |
| 16 | #define CARDBUS_RESERVE_BUSNR 3 |
| 17 | #define PCI_CFG_SPACE_SIZE 256 |
| 18 | #define PCI_CFG_SPACE_EXP_SIZE 4096 |
| 19 | |
| 20 | /* Ugh. Need to stop exporting this to modules. */ |
| 21 | LIST_HEAD(pci_root_buses); |
| 22 | EXPORT_SYMBOL(pci_root_buses); |
| 23 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 24 | |
| 25 | static int find_anything(struct device *dev, void *data) |
| 26 | { |
| 27 | return 1; |
| 28 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 30 | /* |
| 31 | * Some device drivers need know if pci is initiated. |
| 32 | * Basically, we think pci is not initiated when there |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 33 | * is no device to be found on the pci_bus_type. |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 34 | */ |
| 35 | int no_pci_devices(void) |
| 36 | { |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 37 | struct device *dev; |
| 38 | int no_devices; |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 39 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 40 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
| 41 | no_devices = (dev == NULL); |
| 42 | put_device(dev); |
| 43 | return no_devices; |
| 44 | } |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 45 | EXPORT_SYMBOL(no_pci_devices); |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #ifdef HAVE_PCI_LEGACY |
| 48 | /** |
| 49 | * pci_create_legacy_files - create legacy I/O port and memory files |
| 50 | * @b: bus to create files under |
| 51 | * |
| 52 | * Some platforms allow access to legacy I/O port and ISA memory space on |
| 53 | * a per-bus basis. This routine creates the files and ties them into |
| 54 | * their associated read, write and mmap files from pci-sysfs.c |
| 55 | */ |
| 56 | static void pci_create_legacy_files(struct pci_bus *b) |
| 57 | { |
Eric Sesterhenn | f5afe80 | 2006-02-28 15:34:49 +0100 | [diff] [blame] | 58 | b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | GFP_ATOMIC); |
| 60 | if (b->legacy_io) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | b->legacy_io->attr.name = "legacy_io"; |
| 62 | b->legacy_io->size = 0xffff; |
| 63 | b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | b->legacy_io->read = pci_read_legacy_io; |
| 65 | b->legacy_io->write = pci_write_legacy_io; |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 66 | device_create_bin_file(&b->dev, b->legacy_io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* Allocated above after the legacy_io struct */ |
| 69 | b->legacy_mem = b->legacy_io + 1; |
| 70 | b->legacy_mem->attr.name = "legacy_mem"; |
| 71 | b->legacy_mem->size = 1024*1024; |
| 72 | b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | b->legacy_mem->mmap = pci_mmap_legacy_mem; |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 74 | device_create_bin_file(&b->dev, b->legacy_mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | } |
| 77 | |
| 78 | void pci_remove_legacy_files(struct pci_bus *b) |
| 79 | { |
| 80 | if (b->legacy_io) { |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 81 | device_remove_bin_file(&b->dev, b->legacy_io); |
| 82 | device_remove_bin_file(&b->dev, b->legacy_mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | kfree(b->legacy_io); /* both are allocated here */ |
| 84 | } |
| 85 | } |
| 86 | #else /* !HAVE_PCI_LEGACY */ |
| 87 | static inline void pci_create_legacy_files(struct pci_bus *bus) { return; } |
| 88 | void pci_remove_legacy_files(struct pci_bus *bus) { return; } |
| 89 | #endif /* HAVE_PCI_LEGACY */ |
| 90 | |
| 91 | /* |
| 92 | * PCI Bus Class Devices |
| 93 | */ |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 94 | static ssize_t pci_bus_show_cpuaffinity(struct device *dev, |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 95 | int type, |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 96 | struct device_attribute *attr, |
Alan Cox | 4327edf | 2005-09-10 00:25:49 -0700 | [diff] [blame] | 97 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | int ret; |
Alan Cox | 4327edf | 2005-09-10 00:25:49 -0700 | [diff] [blame] | 100 | cpumask_t cpumask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 102 | cpumask = pcibus_to_cpumask(to_pci_bus(dev)); |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 103 | ret = type? |
| 104 | cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask): |
| 105 | cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask); |
| 106 | buf[ret++] = '\n'; |
| 107 | buf[ret] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return ret; |
| 109 | } |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 110 | |
| 111 | static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev, |
| 112 | struct device_attribute *attr, |
| 113 | char *buf) |
| 114 | { |
| 115 | return pci_bus_show_cpuaffinity(dev, 0, attr, buf); |
| 116 | } |
| 117 | |
| 118 | static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev, |
| 119 | struct device_attribute *attr, |
| 120 | char *buf) |
| 121 | { |
| 122 | return pci_bus_show_cpuaffinity(dev, 1, attr, buf); |
| 123 | } |
| 124 | |
| 125 | DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL); |
| 126 | DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | /* |
| 129 | * PCI Bus Class |
| 130 | */ |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 131 | static void release_pcibus_dev(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 133 | struct pci_bus *pci_bus = to_pci_bus(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | if (pci_bus->bridge) |
| 136 | put_device(pci_bus->bridge); |
| 137 | kfree(pci_bus); |
| 138 | } |
| 139 | |
| 140 | static struct class pcibus_class = { |
| 141 | .name = "pci_bus", |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 142 | .dev_release = &release_pcibus_dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
| 145 | static int __init pcibus_class_init(void) |
| 146 | { |
| 147 | return class_register(&pcibus_class); |
| 148 | } |
| 149 | postcore_initcall(pcibus_class_init); |
| 150 | |
| 151 | /* |
| 152 | * Translate the low bits of the PCI base |
| 153 | * to the resource type |
| 154 | */ |
| 155 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) |
| 156 | { |
| 157 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) |
| 158 | return IORESOURCE_IO; |
| 159 | |
| 160 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) |
| 161 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| 162 | |
| 163 | return IORESOURCE_MEM; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Find the extent of a PCI decode.. |
| 168 | */ |
Olof Johansson | f797f9c | 2005-06-13 15:52:27 -0700 | [diff] [blame] | 169 | static u32 pci_size(u32 base, u32 maxbase, u32 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | u32 size = mask & maxbase; /* Find the significant bits */ |
| 172 | if (!size) |
| 173 | return 0; |
| 174 | |
| 175 | /* Get the lowest of them to find the decode size, and |
| 176 | from that the extent. */ |
| 177 | size = (size & ~(size-1)) - 1; |
| 178 | |
| 179 | /* base == maxbase can be valid only if the BAR has |
| 180 | already been programmed with all 1s. */ |
| 181 | if (base == maxbase && ((base | size) & mask) != mask) |
| 182 | return 0; |
| 183 | |
| 184 | return size; |
| 185 | } |
| 186 | |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 187 | static u64 pci_size64(u64 base, u64 maxbase, u64 mask) |
| 188 | { |
| 189 | u64 size = mask & maxbase; /* Find the significant bits */ |
| 190 | if (!size) |
| 191 | return 0; |
| 192 | |
| 193 | /* Get the lowest of them to find the decode size, and |
| 194 | from that the extent. */ |
| 195 | size = (size & ~(size-1)) - 1; |
| 196 | |
| 197 | /* base == maxbase can be valid only if the BAR has |
| 198 | already been programmed with all 1s. */ |
| 199 | if (base == maxbase && ((base | size) & mask) != mask) |
| 200 | return 0; |
| 201 | |
| 202 | return size; |
| 203 | } |
| 204 | |
| 205 | static inline int is_64bit_memory(u32 mask) |
| 206 | { |
| 207 | if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == |
| 208 | (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) |
| 209 | return 1; |
| 210 | return 0; |
| 211 | } |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
| 214 | { |
| 215 | unsigned int pos, reg, next; |
| 216 | u32 l, sz; |
| 217 | struct resource *res; |
| 218 | |
| 219 | for(pos=0; pos<howmany; pos = next) { |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 220 | u64 l64; |
| 221 | u64 sz64; |
| 222 | u32 raw_sz; |
| 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | next = pos+1; |
| 225 | res = &dev->resource[pos]; |
| 226 | res->name = pci_name(dev); |
| 227 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
| 228 | pci_read_config_dword(dev, reg, &l); |
| 229 | pci_write_config_dword(dev, reg, ~0); |
| 230 | pci_read_config_dword(dev, reg, &sz); |
| 231 | pci_write_config_dword(dev, reg, l); |
| 232 | if (!sz || sz == 0xffffffff) |
| 233 | continue; |
| 234 | if (l == 0xffffffff) |
| 235 | l = 0; |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 236 | raw_sz = sz; |
| 237 | if ((l & PCI_BASE_ADDRESS_SPACE) == |
| 238 | PCI_BASE_ADDRESS_SPACE_MEMORY) { |
Amos Waterland | 3c6de92 | 2005-09-22 00:48:19 -0700 | [diff] [blame] | 239 | sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK); |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 240 | /* |
| 241 | * For 64bit prefetchable memory sz could be 0, if the |
| 242 | * real size is bigger than 4G, so we need to check |
| 243 | * szhi for that. |
| 244 | */ |
| 245 | if (!is_64bit_memory(l) && !sz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | continue; |
| 247 | res->start = l & PCI_BASE_ADDRESS_MEM_MASK; |
| 248 | res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK; |
| 249 | } else { |
| 250 | sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff); |
| 251 | if (!sz) |
| 252 | continue; |
| 253 | res->start = l & PCI_BASE_ADDRESS_IO_MASK; |
| 254 | res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK; |
| 255 | } |
| 256 | res->end = res->start + (unsigned long) sz; |
Ivan Kokshaysky | 8845256 | 2008-03-30 19:50:14 +0400 | [diff] [blame] | 257 | res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN; |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 258 | if (is_64bit_memory(l)) { |
H. Peter Anvin | 17d6dc8 | 2006-04-18 17:19:52 -0700 | [diff] [blame] | 259 | u32 szhi, lhi; |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 260 | |
H. Peter Anvin | 17d6dc8 | 2006-04-18 17:19:52 -0700 | [diff] [blame] | 261 | pci_read_config_dword(dev, reg+4, &lhi); |
| 262 | pci_write_config_dword(dev, reg+4, ~0); |
| 263 | pci_read_config_dword(dev, reg+4, &szhi); |
| 264 | pci_write_config_dword(dev, reg+4, lhi); |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 265 | sz64 = ((u64)szhi << 32) | raw_sz; |
| 266 | l64 = ((u64)lhi << 32) | l; |
| 267 | sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | next++; |
| 269 | #if BITS_PER_LONG == 64 |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 270 | if (!sz64) { |
| 271 | res->start = 0; |
| 272 | res->end = 0; |
| 273 | res->flags = 0; |
| 274 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 276 | res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK; |
| 277 | res->end = res->start + sz64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | #else |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 279 | if (sz64 > 0x100000000ULL) { |
| 280 | printk(KERN_ERR "PCI: Unable to handle 64-bit " |
| 281 | "BAR for device %s\n", pci_name(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | res->start = 0; |
| 283 | res->flags = 0; |
Bjorn Helgaas | ea28502 | 2006-06-09 11:28:29 -0700 | [diff] [blame] | 284 | } else if (lhi) { |
H. Peter Anvin | 17d6dc8 | 2006-04-18 17:19:52 -0700 | [diff] [blame] | 285 | /* 64-bit wide address, treat as disabled */ |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 286 | pci_write_config_dword(dev, reg, |
| 287 | l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK); |
H. Peter Anvin | 17d6dc8 | 2006-04-18 17:19:52 -0700 | [diff] [blame] | 288 | pci_write_config_dword(dev, reg+4, 0); |
| 289 | res->start = 0; |
| 290 | res->end = sz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | #endif |
| 293 | } |
| 294 | } |
| 295 | if (rom) { |
| 296 | dev->rom_base_reg = rom; |
| 297 | res = &dev->resource[PCI_ROM_RESOURCE]; |
| 298 | res->name = pci_name(dev); |
| 299 | pci_read_config_dword(dev, rom, &l); |
| 300 | pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE); |
| 301 | pci_read_config_dword(dev, rom, &sz); |
| 302 | pci_write_config_dword(dev, rom, l); |
| 303 | if (l == 0xffffffff) |
| 304 | l = 0; |
| 305 | if (sz && sz != 0xffffffff) { |
Amos Waterland | 3c6de92 | 2005-09-22 00:48:19 -0700 | [diff] [blame] | 306 | sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | if (sz) { |
| 308 | res->flags = (l & IORESOURCE_ROM_ENABLE) | |
Gary Hade | bb44609 | 2007-12-11 17:09:13 -0800 | [diff] [blame] | 309 | IORESOURCE_MEM | IORESOURCE_PREFETCH | |
Ivan Kokshaysky | 8845256 | 2008-03-30 19:50:14 +0400 | [diff] [blame] | 310 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | |
| 311 | IORESOURCE_SIZEALIGN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | res->start = l & PCI_ROM_ADDRESS_MASK; |
| 313 | res->end = res->start + (unsigned long) sz; |
| 314 | } |
| 315 | } |
| 316 | } |
| 317 | } |
| 318 | |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 319 | void __devinit pci_read_bridge_bases(struct pci_bus *child) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | struct pci_dev *dev = child->self; |
| 322 | u8 io_base_lo, io_limit_lo; |
| 323 | u16 mem_base_lo, mem_limit_lo; |
| 324 | unsigned long base, limit; |
| 325 | struct resource *res; |
| 326 | int i; |
| 327 | |
| 328 | if (!dev) /* It's a host bus, nothing to read */ |
| 329 | return; |
| 330 | |
| 331 | if (dev->transparent) { |
| 332 | printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); |
Ivan Kokshaysky | 90b5492 | 2005-06-07 04:07:02 +0400 | [diff] [blame] | 333 | for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++) |
| 334 | child->resource[i] = child->parent->resource[i - 3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | for(i=0; i<3; i++) |
| 338 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; |
| 339 | |
| 340 | res = child->resource[0]; |
| 341 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); |
| 342 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); |
| 343 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; |
| 344 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; |
| 345 | |
| 346 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { |
| 347 | u16 io_base_hi, io_limit_hi; |
| 348 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
| 349 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); |
| 350 | base |= (io_base_hi << 16); |
| 351 | limit |= (io_limit_hi << 16); |
| 352 | } |
| 353 | |
| 354 | if (base <= limit) { |
| 355 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
Daniel Yeisley | 9d26512 | 2005-12-05 07:06:43 -0500 | [diff] [blame] | 356 | if (!res->start) |
| 357 | res->start = base; |
| 358 | if (!res->end) |
| 359 | res->end = limit + 0xfff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | res = child->resource[1]; |
| 363 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); |
| 364 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); |
| 365 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| 366 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| 367 | if (base <= limit) { |
| 368 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
| 369 | res->start = base; |
| 370 | res->end = limit + 0xfffff; |
| 371 | } |
| 372 | |
| 373 | res = child->resource[2]; |
| 374 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); |
| 375 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); |
| 376 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
| 377 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; |
| 378 | |
| 379 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { |
| 380 | u32 mem_base_hi, mem_limit_hi; |
| 381 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
| 382 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); |
| 383 | |
| 384 | /* |
| 385 | * Some bridges set the base > limit by default, and some |
| 386 | * (broken) BIOSes do not initialize them. If we find |
| 387 | * this, just assume they are not being used. |
| 388 | */ |
| 389 | if (mem_base_hi <= mem_limit_hi) { |
| 390 | #if BITS_PER_LONG == 64 |
| 391 | base |= ((long) mem_base_hi) << 32; |
| 392 | limit |= ((long) mem_limit_hi) << 32; |
| 393 | #else |
| 394 | if (mem_base_hi || mem_limit_hi) { |
| 395 | printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev)); |
| 396 | return; |
| 397 | } |
| 398 | #endif |
| 399 | } |
| 400 | } |
| 401 | if (base <= limit) { |
| 402 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| 403 | res->start = base; |
| 404 | res->end = limit + 0xfffff; |
| 405 | } |
| 406 | } |
| 407 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 408 | static struct pci_bus * pci_alloc_bus(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
| 410 | struct pci_bus *b; |
| 411 | |
Eric Sesterhenn | f5afe80 | 2006-02-28 15:34:49 +0100 | [diff] [blame] | 412 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (b) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | INIT_LIST_HEAD(&b->node); |
| 415 | INIT_LIST_HEAD(&b->children); |
| 416 | INIT_LIST_HEAD(&b->devices); |
| 417 | } |
| 418 | return b; |
| 419 | } |
| 420 | |
Adrian Bunk | cbd4e05 | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 421 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
| 422 | struct pci_dev *bridge, int busnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | { |
| 424 | struct pci_bus *child; |
| 425 | int i; |
| 426 | |
| 427 | /* |
| 428 | * Allocate a new bus, and inherit stuff from the parent.. |
| 429 | */ |
| 430 | child = pci_alloc_bus(); |
| 431 | if (!child) |
| 432 | return NULL; |
| 433 | |
| 434 | child->self = bridge; |
| 435 | child->parent = parent; |
| 436 | child->ops = parent->ops; |
| 437 | child->sysdata = parent->sysdata; |
Michael S. Tsirkin | 6e325a6 | 2006-02-14 18:52:22 +0200 | [diff] [blame] | 438 | child->bus_flags = parent->bus_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | child->bridge = get_device(&bridge->dev); |
| 440 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 441 | /* initialize some portions of the bus device, but don't register it |
| 442 | * now as the parent is not properly set up yet. This device will get |
| 443 | * registered later in pci_bus_add_devices() |
| 444 | */ |
| 445 | child->dev.class = &pcibus_class; |
| 446 | sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
| 448 | /* |
| 449 | * Set up the primary, secondary and subordinate |
| 450 | * bus numbers. |
| 451 | */ |
| 452 | child->number = child->secondary = busnr; |
| 453 | child->primary = parent->secondary; |
| 454 | child->subordinate = 0xff; |
| 455 | |
| 456 | /* Set up default resource pointers and names.. */ |
| 457 | for (i = 0; i < 4; i++) { |
| 458 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
| 459 | child->resource[i]->name = child->name; |
| 460 | } |
| 461 | bridge->subordinate = child; |
| 462 | |
| 463 | return child; |
| 464 | } |
| 465 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 466 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | { |
| 468 | struct pci_bus *child; |
| 469 | |
| 470 | child = pci_alloc_child_bus(parent, dev, busnr); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 471 | if (child) { |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 472 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | list_add_tail(&child->node, &parent->children); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 474 | up_write(&pci_bus_sem); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 475 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return child; |
| 477 | } |
| 478 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 479 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 480 | { |
| 481 | struct pci_bus *parent = child->parent; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 482 | |
| 483 | /* Attempts to fix that up are really dangerous unless |
| 484 | we're going to re-assign all bus numbers. */ |
| 485 | if (!pcibios_assign_all_busses()) |
| 486 | return; |
| 487 | |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 488 | while (parent->parent && parent->subordinate < max) { |
| 489 | parent->subordinate = max; |
| 490 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); |
| 491 | parent = parent->parent; |
| 492 | } |
| 493 | } |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* |
| 496 | * If it's a bridge, configure it and scan the bus behind it. |
| 497 | * For CardBus bridges, we don't scan behind as the devices will |
| 498 | * be handled by the bridge driver itself. |
| 499 | * |
| 500 | * We need to process bridges in two passes -- first we scan those |
| 501 | * already configured by the BIOS and after we are done with all of |
| 502 | * them, we proceed to assigning numbers to the remaining buses in |
| 503 | * order to avoid overlaps between old and new bus numbers. |
| 504 | */ |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 505 | int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
| 507 | struct pci_bus *child; |
| 508 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 509 | u32 buses, i, j = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | u16 bctl; |
| 511 | |
| 512 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); |
| 513 | |
| 514 | pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n", |
| 515 | pci_name(dev), buses & 0xffffff, pass); |
| 516 | |
| 517 | /* Disable MasterAbortMode during probing to avoid reporting |
| 518 | of bus errors (in some architectures) */ |
| 519 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
| 520 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, |
| 521 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); |
| 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) { |
| 524 | unsigned int cmax, busnr; |
| 525 | /* |
| 526 | * Bus already configured by firmware, process it in the first |
| 527 | * pass and just note the configuration. |
| 528 | */ |
| 529 | if (pass) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 530 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | busnr = (buses >> 8) & 0xFF; |
| 532 | |
| 533 | /* |
| 534 | * If we already got to this bus through a different bridge, |
| 535 | * ignore it. This can happen with the i450NX chipset. |
| 536 | */ |
| 537 | if (pci_find_bus(pci_domain_nr(bus), busnr)) { |
| 538 | printk(KERN_INFO "PCI: Bus %04x:%02x already known\n", |
| 539 | pci_domain_nr(bus), busnr); |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 540 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Rajesh Shah | 6ef6f0e | 2005-04-28 00:25:49 -0700 | [diff] [blame] | 543 | child = pci_add_new_bus(bus, dev, busnr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | if (!child) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 545 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | child->primary = buses & 0xFF; |
| 547 | child->subordinate = (buses >> 16) & 0xFF; |
Gary Hade | 1194925 | 2007-10-08 16:24:16 -0700 | [diff] [blame] | 548 | child->bridge_ctl = bctl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | cmax = pci_scan_child_bus(child); |
| 551 | if (cmax > max) |
| 552 | max = cmax; |
| 553 | if (child->subordinate > max) |
| 554 | max = child->subordinate; |
| 555 | } else { |
| 556 | /* |
| 557 | * We need to assign a number to this bus which we always |
| 558 | * do in the second pass. |
| 559 | */ |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 560 | if (!pass) { |
| 561 | if (pcibios_assign_all_busses()) |
| 562 | /* Temporarily disable forwarding of the |
| 563 | configuration cycles on all bridges in |
| 564 | this bus segment to avoid possible |
| 565 | conflicts in the second pass between two |
| 566 | bridges programmed with overlapping |
| 567 | bus ranges. */ |
| 568 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, |
| 569 | buses & ~0xffffff); |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 570 | goto out; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 571 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
| 573 | /* Clear errors */ |
| 574 | pci_write_config_word(dev, PCI_STATUS, 0xffff); |
| 575 | |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 576 | /* Prevent assigning a bus number that already exists. |
| 577 | * This can happen when a bridge is hot-plugged */ |
| 578 | if (pci_find_bus(pci_domain_nr(bus), max+1)) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 579 | goto out; |
Rajesh Shah | 6ef6f0e | 2005-04-28 00:25:49 -0700 | [diff] [blame] | 580 | child = pci_add_new_bus(bus, dev, ++max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | buses = (buses & 0xff000000) |
| 582 | | ((unsigned int)(child->primary) << 0) |
| 583 | | ((unsigned int)(child->secondary) << 8) |
| 584 | | ((unsigned int)(child->subordinate) << 16); |
| 585 | |
| 586 | /* |
| 587 | * yenta.c forces a secondary latency timer of 176. |
| 588 | * Copy that behaviour here. |
| 589 | */ |
| 590 | if (is_cardbus) { |
| 591 | buses &= ~0xff000000; |
| 592 | buses |= CARDBUS_LATENCY_TIMER << 24; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * We need to blast all three values with a single write. |
| 597 | */ |
| 598 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); |
| 599 | |
| 600 | if (!is_cardbus) { |
Gary Hade | 1194925 | 2007-10-08 16:24:16 -0700 | [diff] [blame] | 601 | child->bridge_ctl = bctl; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 602 | /* |
| 603 | * Adjust subordinate busnr in parent buses. |
| 604 | * We do this before scanning for children because |
| 605 | * some devices may not be detected if the bios |
| 606 | * was lazy. |
| 607 | */ |
| 608 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | /* Now we can scan all subordinate buses... */ |
| 610 | max = pci_scan_child_bus(child); |
Kristen Accardi | e3ac86d | 2006-01-17 16:57:01 -0800 | [diff] [blame] | 611 | /* |
| 612 | * now fix it up again since we have found |
| 613 | * the real value of max. |
| 614 | */ |
| 615 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } else { |
| 617 | /* |
| 618 | * For CardBus bridges, we leave 4 bus numbers |
| 619 | * as cards with a PCI-to-PCI bridge can be |
| 620 | * inserted later. |
| 621 | */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 622 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
| 623 | struct pci_bus *parent = bus; |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 624 | if (pci_find_bus(pci_domain_nr(bus), |
| 625 | max+i+1)) |
| 626 | break; |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 627 | while (parent->parent) { |
| 628 | if ((!pcibios_assign_all_busses()) && |
| 629 | (parent->subordinate > max) && |
| 630 | (parent->subordinate <= max+i)) { |
| 631 | j = 1; |
| 632 | } |
| 633 | parent = parent->parent; |
| 634 | } |
| 635 | if (j) { |
| 636 | /* |
| 637 | * Often, there are two cardbus bridges |
| 638 | * -- try to leave one valid bus number |
| 639 | * for each one. |
| 640 | */ |
| 641 | i /= 2; |
| 642 | break; |
| 643 | } |
| 644 | } |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 645 | max += i; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 646 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | /* |
| 649 | * Set the subordinate bus number to its real value. |
| 650 | */ |
| 651 | child->subordinate = max; |
| 652 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
| 653 | } |
| 654 | |
Gary Hade | cb3576f | 2008-02-08 14:00:52 -0800 | [diff] [blame] | 655 | sprintf(child->name, |
| 656 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), |
| 657 | pci_domain_nr(bus), child->number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 659 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 660 | while (bus->parent) { |
| 661 | if ((child->subordinate > bus->subordinate) || |
| 662 | (child->number > bus->subordinate) || |
| 663 | (child->number < bus->number) || |
| 664 | (child->subordinate < bus->number)) { |
Joe Perches | a6f29a9 | 2007-11-19 17:48:29 -0800 | [diff] [blame] | 665 | pr_debug("PCI: Bus #%02x (-#%02x) is %s " |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 666 | "hidden behind%s bridge #%02x (-#%02x)\n", |
| 667 | child->number, child->subordinate, |
| 668 | (bus->number > child->subordinate && |
| 669 | bus->subordinate < child->number) ? |
Joe Perches | a6f29a9 | 2007-11-19 17:48:29 -0800 | [diff] [blame] | 670 | "wholly" : "partially", |
| 671 | bus->self->transparent ? " transparent" : "", |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 672 | bus->number, bus->subordinate); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 673 | } |
| 674 | bus = bus->parent; |
| 675 | } |
| 676 | |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 677 | out: |
| 678 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); |
| 679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | return max; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Read interrupt line and base address registers. |
| 685 | * The architecture-dependent code can tweak these, of course. |
| 686 | */ |
| 687 | static void pci_read_irq(struct pci_dev *dev) |
| 688 | { |
| 689 | unsigned char irq; |
| 690 | |
| 691 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); |
Kristen Accardi | ffeff78 | 2005-11-02 16:24:32 -0800 | [diff] [blame] | 692 | dev->pin = irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | if (irq) |
| 694 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); |
| 695 | dev->irq = irq; |
| 696 | } |
| 697 | |
Bartlomiej Zolnierkiewicz | 01abc2a | 2007-04-23 23:19:36 +0200 | [diff] [blame] | 698 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
Randy Dunlap | 76e6a1d | 2006-12-29 16:47:29 -0800 | [diff] [blame] | 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | /** |
| 701 | * pci_setup_device - fill in class and map information of a device |
| 702 | * @dev: the device structure to fill |
| 703 | * |
| 704 | * Initialize the device structure with information about the device's |
| 705 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
| 706 | * Called at initialisation of the PCI subsystem and by CardBus services. |
| 707 | * Returns 0 on success and -1 if unknown type of device (not normal, bridge |
| 708 | * or CardBus). |
| 709 | */ |
| 710 | static int pci_setup_device(struct pci_dev * dev) |
| 711 | { |
| 712 | u32 class; |
| 713 | |
| 714 | sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
| 715 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| 716 | |
| 717 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); |
Auke Kok | b8a3a52 | 2007-06-08 15:46:30 -0700 | [diff] [blame] | 718 | dev->revision = class & 0xff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | class >>= 8; /* upper 3 bytes */ |
| 720 | dev->class = class; |
| 721 | class >>= 8; |
| 722 | |
| 723 | pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev), |
| 724 | dev->vendor, dev->device, class, dev->hdr_type); |
| 725 | |
| 726 | /* "Unknown power state" */ |
Daniel Ritz | 3fe9d19 | 2005-08-17 15:32:19 -0700 | [diff] [blame] | 727 | dev->current_state = PCI_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | /* Early fixups, before probing the BARs */ |
| 730 | pci_fixup_device(pci_fixup_early, dev); |
| 731 | class = dev->class >> 8; |
| 732 | |
| 733 | switch (dev->hdr_type) { /* header type */ |
| 734 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| 735 | if (class == PCI_CLASS_BRIDGE_PCI) |
| 736 | goto bad; |
| 737 | pci_read_irq(dev); |
| 738 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); |
| 739 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 740 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 741 | |
| 742 | /* |
| 743 | * Do the ugly legacy mode stuff here rather than broken chip |
| 744 | * quirk code. Legacy mode ATA controllers have fixed |
| 745 | * addresses. These are not always echoed in BAR0-3, and |
| 746 | * BAR0-3 in a few cases contain junk! |
| 747 | */ |
| 748 | if (class == PCI_CLASS_STORAGE_IDE) { |
| 749 | u8 progif; |
| 750 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); |
| 751 | if ((progif & 1) == 0) { |
Linus Torvalds | af1bff4 | 2007-12-10 07:40:54 -0800 | [diff] [blame] | 752 | dev->resource[0].start = 0x1F0; |
| 753 | dev->resource[0].end = 0x1F7; |
| 754 | dev->resource[0].flags = LEGACY_IO_RESOURCE; |
| 755 | dev->resource[1].start = 0x3F6; |
| 756 | dev->resource[1].end = 0x3F6; |
| 757 | dev->resource[1].flags = LEGACY_IO_RESOURCE; |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 758 | } |
| 759 | if ((progif & 4) == 0) { |
Linus Torvalds | af1bff4 | 2007-12-10 07:40:54 -0800 | [diff] [blame] | 760 | dev->resource[2].start = 0x170; |
| 761 | dev->resource[2].end = 0x177; |
| 762 | dev->resource[2].flags = LEGACY_IO_RESOURCE; |
| 763 | dev->resource[3].start = 0x376; |
| 764 | dev->resource[3].end = 0x376; |
| 765 | dev->resource[3].flags = LEGACY_IO_RESOURCE; |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 766 | } |
| 767 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | break; |
| 769 | |
| 770 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ |
| 771 | if (class != PCI_CLASS_BRIDGE_PCI) |
| 772 | goto bad; |
| 773 | /* The PCI-to-PCI bridge spec requires that subtractive |
| 774 | decoding (i.e. transparent) bridge must have programming |
| 775 | interface code of 0x01. */ |
Kristen Accardi | 3efd273 | 2005-11-02 16:55:49 -0800 | [diff] [blame] | 776 | pci_read_irq(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | dev->transparent = ((dev->class & 0xff) == 1); |
| 778 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); |
| 779 | break; |
| 780 | |
| 781 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ |
| 782 | if (class != PCI_CLASS_BRIDGE_CARDBUS) |
| 783 | goto bad; |
| 784 | pci_read_irq(dev); |
| 785 | pci_read_bases(dev, 1, 0); |
| 786 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 787 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); |
| 788 | break; |
| 789 | |
| 790 | default: /* unknown header */ |
| 791 | printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n", |
| 792 | pci_name(dev), dev->hdr_type); |
| 793 | return -1; |
| 794 | |
| 795 | bad: |
| 796 | printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n", |
| 797 | pci_name(dev), class, dev->hdr_type); |
| 798 | dev->class = PCI_CLASS_NOT_DEFINED; |
| 799 | } |
| 800 | |
| 801 | /* We found a fine healthy device, go go go... */ |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | /** |
| 806 | * pci_release_dev - free a pci device structure when all users of it are finished. |
| 807 | * @dev: device that's been disconnected |
| 808 | * |
| 809 | * Will be called only by the device core when all users of this pci device are |
| 810 | * done. |
| 811 | */ |
| 812 | static void pci_release_dev(struct device *dev) |
| 813 | { |
| 814 | struct pci_dev *pci_dev; |
| 815 | |
| 816 | pci_dev = to_pci_dev(dev); |
Ben Hutchings | 94e6108 | 2008-03-05 16:52:39 +0000 | [diff] [blame] | 817 | pci_vpd_release(pci_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | kfree(pci_dev); |
| 819 | } |
| 820 | |
Keshavamurthy, Anil S | 994a65e | 2007-10-21 16:41:46 -0700 | [diff] [blame] | 821 | static void set_pcie_port_type(struct pci_dev *pdev) |
| 822 | { |
| 823 | int pos; |
| 824 | u16 reg16; |
| 825 | |
| 826 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); |
| 827 | if (!pos) |
| 828 | return; |
| 829 | pdev->is_pcie = 1; |
| 830 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
| 831 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; |
| 832 | } |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /** |
| 835 | * pci_cfg_space_size - get the configuration space size of the PCI device. |
Randy Dunlap | 8f7020d | 2005-10-23 11:57:38 -0700 | [diff] [blame] | 836 | * @dev: PCI device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | * |
| 838 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices |
| 839 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can |
| 840 | * access it. Maybe we don't have a way to generate extended config space |
| 841 | * accesses, or the device is behind a reverse Express bridge. So we try |
| 842 | * reading the dword at 0x100 which must either be 0 or a valid extended |
| 843 | * capability header. |
| 844 | */ |
Benjamin Herrenschmidt | ac7dc65 | 2005-12-13 18:09:16 +1100 | [diff] [blame] | 845 | int pci_cfg_space_size(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | { |
| 847 | int pos; |
| 848 | u32 status; |
| 849 | |
| 850 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 851 | if (!pos) { |
| 852 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 853 | if (!pos) |
| 854 | goto fail; |
| 855 | |
| 856 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); |
| 857 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) |
| 858 | goto fail; |
| 859 | } |
| 860 | |
| 861 | if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL) |
| 862 | goto fail; |
| 863 | if (status == 0xffffffff) |
| 864 | goto fail; |
| 865 | |
| 866 | return PCI_CFG_SPACE_EXP_SIZE; |
| 867 | |
| 868 | fail: |
| 869 | return PCI_CFG_SPACE_SIZE; |
| 870 | } |
| 871 | |
| 872 | static void pci_release_bus_bridge_dev(struct device *dev) |
| 873 | { |
| 874 | kfree(dev); |
| 875 | } |
| 876 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 877 | struct pci_dev *alloc_pci_dev(void) |
| 878 | { |
| 879 | struct pci_dev *dev; |
| 880 | |
| 881 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); |
| 882 | if (!dev) |
| 883 | return NULL; |
| 884 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 885 | INIT_LIST_HEAD(&dev->bus_list); |
| 886 | |
Michael Ellerman | 4aa9bc9 | 2007-04-05 17:19:10 +1000 | [diff] [blame] | 887 | pci_msi_init_pci_dev(dev); |
| 888 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 889 | return dev; |
| 890 | } |
| 891 | EXPORT_SYMBOL(alloc_pci_dev); |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | /* |
| 894 | * Read the config data for a PCI device, sanity-check it |
| 895 | * and fill in the dev structure... |
| 896 | */ |
Adrian Bunk | 7f7b5de | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 897 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | { |
| 899 | struct pci_dev *dev; |
| 900 | u32 l; |
| 901 | u8 hdr_type; |
| 902 | int delay = 1; |
| 903 | |
| 904 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| 905 | return NULL; |
| 906 | |
| 907 | /* some broken boards return 0 or ~0 if a slot is empty: */ |
| 908 | if (l == 0xffffffff || l == 0x00000000 || |
| 909 | l == 0x0000ffff || l == 0xffff0000) |
| 910 | return NULL; |
| 911 | |
| 912 | /* Configuration request Retry Status */ |
| 913 | while (l == 0xffff0001) { |
| 914 | msleep(delay); |
| 915 | delay *= 2; |
| 916 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| 917 | return NULL; |
| 918 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
| 919 | if (delay > 60 * 1000) { |
| 920 | printk(KERN_WARNING "Device %04x:%02x:%02x.%d not " |
| 921 | "responding\n", pci_domain_nr(bus), |
| 922 | bus->number, PCI_SLOT(devfn), |
| 923 | PCI_FUNC(devfn)); |
| 924 | return NULL; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type)) |
| 929 | return NULL; |
| 930 | |
Michael Ellerman | bab41e9 | 2007-04-05 17:19:09 +1000 | [diff] [blame] | 931 | dev = alloc_pci_dev(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | if (!dev) |
| 933 | return NULL; |
| 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | dev->bus = bus; |
| 936 | dev->sysdata = bus->sysdata; |
| 937 | dev->dev.parent = bus->bridge; |
| 938 | dev->dev.bus = &pci_bus_type; |
| 939 | dev->devfn = devfn; |
| 940 | dev->hdr_type = hdr_type & 0x7f; |
| 941 | dev->multifunction = !!(hdr_type & 0x80); |
| 942 | dev->vendor = l & 0xffff; |
| 943 | dev->device = (l >> 16) & 0xffff; |
| 944 | dev->cfg_size = pci_cfg_space_size(dev); |
Linas Vepstas | 8208179 | 2006-07-10 04:44:46 -0700 | [diff] [blame] | 945 | dev->error_state = pci_channel_io_normal; |
Keshavamurthy, Anil S | 994a65e | 2007-10-21 16:41:46 -0700 | [diff] [blame] | 946 | set_pcie_port_type(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
| 948 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) |
| 949 | set this higher, assuming the system even supports it. */ |
| 950 | dev->dma_mask = 0xffffffff; |
| 951 | if (pci_setup_device(dev) < 0) { |
| 952 | kfree(dev); |
| 953 | return NULL; |
| 954 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 955 | |
Ben Hutchings | 94e6108 | 2008-03-05 16:52:39 +0000 | [diff] [blame] | 956 | pci_vpd_pci22_init(dev); |
| 957 | |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 958 | return dev; |
| 959 | } |
| 960 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 961 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 962 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | device_initialize(&dev->dev); |
| 964 | dev->dev.release = pci_release_dev; |
| 965 | pci_dev_get(dev); |
| 966 | |
Christoph Hellwig | 8734813 | 2006-12-06 20:32:33 -0800 | [diff] [blame] | 967 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | dev->dev.dma_mask = &dev->dma_mask; |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 969 | dev->dev.dma_parms = &dev->dma_parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | dev->dev.coherent_dma_mask = 0xffffffffull; |
| 971 | |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 972 | pci_set_dma_max_seg_size(dev, 65536); |
FUJITA Tomonori | 59fc67d | 2008-02-04 22:28:14 -0800 | [diff] [blame] | 973 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 974 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | /* Fix up broken headers */ |
| 976 | pci_fixup_device(pci_fixup_header, dev); |
| 977 | |
| 978 | /* |
| 979 | * Add the device to our list of discovered devices |
| 980 | * and the bus list for fixup functions, etc. |
| 981 | */ |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 982 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | list_add_tail(&dev->bus_list, &bus->devices); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 984 | up_write(&pci_bus_sem); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 985 | } |
| 986 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 987 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 988 | { |
| 989 | struct pci_dev *dev; |
| 990 | |
| 991 | dev = pci_scan_device(bus, devfn); |
| 992 | if (!dev) |
| 993 | return NULL; |
| 994 | |
| 995 | pci_device_add(dev, bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
| 997 | return dev; |
| 998 | } |
Adrian Bunk | b73e968 | 2007-11-21 15:07:11 -0800 | [diff] [blame] | 999 | EXPORT_SYMBOL(pci_scan_single_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
| 1001 | /** |
| 1002 | * pci_scan_slot - scan a PCI slot on a bus for devices. |
| 1003 | * @bus: PCI bus to scan |
| 1004 | * @devfn: slot number to scan (must have zero function.) |
| 1005 | * |
| 1006 | * Scan a PCI slot on the specified PCI bus for devices, adding |
| 1007 | * discovered devices to the @bus->devices list. New devices |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 1008 | * will not have is_added set. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1010 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | { |
| 1012 | int func, nr = 0; |
| 1013 | int scan_all_fns; |
| 1014 | |
| 1015 | scan_all_fns = pcibios_scan_all_fns(bus, devfn); |
| 1016 | |
| 1017 | for (func = 0; func < 8; func++, devfn++) { |
| 1018 | struct pci_dev *dev; |
| 1019 | |
| 1020 | dev = pci_scan_single_device(bus, devfn); |
| 1021 | if (dev) { |
| 1022 | nr++; |
| 1023 | |
| 1024 | /* |
| 1025 | * If this is a single function device, |
| 1026 | * don't scan past the first function. |
| 1027 | */ |
| 1028 | if (!dev->multifunction) { |
| 1029 | if (func > 0) { |
| 1030 | dev->multifunction = 1; |
| 1031 | } else { |
| 1032 | break; |
| 1033 | } |
| 1034 | } |
| 1035 | } else { |
| 1036 | if (func == 0 && !scan_all_fns) |
| 1037 | break; |
| 1038 | } |
| 1039 | } |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 1040 | |
| 1041 | if (bus->self) |
| 1042 | pcie_aspm_init_link_state(bus->self); |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | return nr; |
| 1045 | } |
| 1046 | |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 1047 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | { |
| 1049 | unsigned int devfn, pass, max = bus->secondary; |
| 1050 | struct pci_dev *dev; |
| 1051 | |
| 1052 | pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number); |
| 1053 | |
| 1054 | /* Go find them, Rover! */ |
| 1055 | for (devfn = 0; devfn < 0x100; devfn += 8) |
| 1056 | pci_scan_slot(bus, devfn); |
| 1057 | |
| 1058 | /* |
| 1059 | * After performing arch-dependent fixup of the bus, look behind |
| 1060 | * all PCI-to-PCI bridges on this bus. |
| 1061 | */ |
| 1062 | pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number); |
| 1063 | pcibios_fixup_bus(bus); |
| 1064 | for (pass=0; pass < 2; pass++) |
| 1065 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1066 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| 1067 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| 1068 | max = pci_scan_bridge(bus, dev, max, pass); |
| 1069 | } |
| 1070 | |
| 1071 | /* |
| 1072 | * We've scanned the bus and so we know all about what's on |
| 1073 | * the other side of any bridges that may be on this bus plus |
| 1074 | * any devices. |
| 1075 | * |
| 1076 | * Return how far we've got finding sub-buses. |
| 1077 | */ |
| 1078 | pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n", |
| 1079 | pci_domain_nr(bus), bus->number, max); |
| 1080 | return max; |
| 1081 | } |
| 1082 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1083 | struct pci_bus * pci_create_bus(struct device *parent, |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1084 | int bus, struct pci_ops *ops, void *sysdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | { |
| 1086 | int error; |
| 1087 | struct pci_bus *b; |
| 1088 | struct device *dev; |
| 1089 | |
| 1090 | b = pci_alloc_bus(); |
| 1091 | if (!b) |
| 1092 | return NULL; |
| 1093 | |
| 1094 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| 1095 | if (!dev){ |
| 1096 | kfree(b); |
| 1097 | return NULL; |
| 1098 | } |
| 1099 | |
| 1100 | b->sysdata = sysdata; |
| 1101 | b->ops = ops; |
| 1102 | |
| 1103 | if (pci_find_bus(pci_domain_nr(b), bus)) { |
| 1104 | /* If we already got to this bus through a different bridge, ignore it */ |
| 1105 | pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); |
| 1106 | goto err_out; |
| 1107 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1108 | |
| 1109 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | list_add_tail(&b->node, &pci_root_buses); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1111 | up_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
| 1113 | memset(dev, 0, sizeof(*dev)); |
| 1114 | dev->parent = parent; |
| 1115 | dev->release = pci_release_bus_bridge_dev; |
| 1116 | sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus); |
| 1117 | error = device_register(dev); |
| 1118 | if (error) |
| 1119 | goto dev_reg_err; |
| 1120 | b->bridge = get_device(dev); |
| 1121 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1122 | b->dev.class = &pcibus_class; |
| 1123 | b->dev.parent = b->bridge; |
| 1124 | sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus); |
| 1125 | error = device_register(&b->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | if (error) |
| 1127 | goto class_dev_reg_err; |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1128 | error = device_create_file(&b->dev, &dev_attr_cpuaffinity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | if (error) |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1130 | goto dev_create_file_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | |
| 1132 | /* Create legacy_io and legacy_mem files for this bus */ |
| 1133 | pci_create_legacy_files(b); |
| 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | b->number = b->secondary = bus; |
| 1136 | b->resource[0] = &ioport_resource; |
| 1137 | b->resource[1] = &iomem_resource; |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | return b; |
| 1140 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1141 | dev_create_file_err: |
| 1142 | device_unregister(&b->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | class_dev_reg_err: |
| 1144 | device_unregister(dev); |
| 1145 | dev_reg_err: |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1146 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | list_del(&b->node); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1148 | up_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | err_out: |
| 1150 | kfree(dev); |
| 1151 | kfree(b); |
| 1152 | return NULL; |
| 1153 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1154 | |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 1155 | struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1156 | int bus, struct pci_ops *ops, void *sysdata) |
| 1157 | { |
| 1158 | struct pci_bus *b; |
| 1159 | |
| 1160 | b = pci_create_bus(parent, bus, ops, sysdata); |
| 1161 | if (b) |
| 1162 | b->subordinate = pci_scan_child_bus(b); |
| 1163 | return b; |
| 1164 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | EXPORT_SYMBOL(pci_scan_bus_parented); |
| 1166 | |
| 1167 | #ifdef CONFIG_HOTPLUG |
| 1168 | EXPORT_SYMBOL(pci_add_new_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | EXPORT_SYMBOL(pci_scan_slot); |
| 1170 | EXPORT_SYMBOL(pci_scan_bridge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
| 1172 | #endif |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1173 | |
| 1174 | static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b) |
| 1175 | { |
| 1176 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
| 1177 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; |
| 1178 | |
| 1179 | if (a->bus->number < b->bus->number) return -1; |
| 1180 | else if (a->bus->number > b->bus->number) return 1; |
| 1181 | |
| 1182 | if (a->devfn < b->devfn) return -1; |
| 1183 | else if (a->devfn > b->devfn) return 1; |
| 1184 | |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * Yes, this forcably breaks the klist abstraction temporarily. It |
| 1190 | * just wants to sort the klist, not change reference counts and |
| 1191 | * take/drop locks rapidly in the process. It does all this while |
| 1192 | * holding the lock for the list, so objects can't otherwise be |
| 1193 | * added/removed while we're swizzling. |
| 1194 | */ |
| 1195 | static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list) |
| 1196 | { |
| 1197 | struct list_head *pos; |
| 1198 | struct klist_node *n; |
| 1199 | struct device *dev; |
| 1200 | struct pci_dev *b; |
| 1201 | |
| 1202 | list_for_each(pos, list) { |
| 1203 | n = container_of(pos, struct klist_node, n_node); |
| 1204 | dev = container_of(n, struct device, knode_bus); |
| 1205 | b = to_pci_dev(dev); |
| 1206 | if (pci_sort_bf_cmp(a, b) <= 0) { |
| 1207 | list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node); |
| 1208 | return; |
| 1209 | } |
| 1210 | } |
| 1211 | list_move_tail(&a->dev.knode_bus.n_node, list); |
| 1212 | } |
| 1213 | |
Greg Kroah-Hartman | 5ff580c | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 1214 | void __init pci_sort_breadthfirst(void) |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1215 | { |
| 1216 | LIST_HEAD(sorted_devices); |
| 1217 | struct list_head *pos, *tmp; |
| 1218 | struct klist_node *n; |
| 1219 | struct device *dev; |
| 1220 | struct pci_dev *pdev; |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1221 | struct klist *device_klist; |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1222 | |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1223 | device_klist = bus_get_device_klist(&pci_bus_type); |
| 1224 | |
| 1225 | spin_lock(&device_klist->k_lock); |
| 1226 | list_for_each_safe(pos, tmp, &device_klist->k_list) { |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1227 | n = container_of(pos, struct klist_node, n_node); |
| 1228 | dev = container_of(n, struct device, knode_bus); |
| 1229 | pdev = to_pci_dev(dev); |
| 1230 | pci_insertion_sort_klist(pdev, &sorted_devices); |
| 1231 | } |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1232 | list_splice(&sorted_devices, &device_klist->k_list); |
| 1233 | spin_unlock(&device_klist->k_lock); |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1234 | } |