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> |
Matt Domsch | 0584396 | 2009-11-02 11:51:24 -0600 | [diff] [blame] | 13 | #include <acpi/acpi_hest.h> |
Greg KH | bc56b9e | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 14 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ |
| 17 | #define CARDBUS_RESERVE_BUSNR 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | /* Ugh. Need to stop exporting this to modules. */ |
| 20 | LIST_HEAD(pci_root_buses); |
| 21 | EXPORT_SYMBOL(pci_root_buses); |
| 22 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 23 | |
| 24 | static int find_anything(struct device *dev, void *data) |
| 25 | { |
| 26 | return 1; |
| 27 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 29 | /* |
| 30 | * Some device drivers need know if pci is initiated. |
| 31 | * Basically, we think pci is not initiated when there |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 32 | * is no device to be found on the pci_bus_type. |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 33 | */ |
| 34 | int no_pci_devices(void) |
| 35 | { |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 36 | struct device *dev; |
| 37 | int no_devices; |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 38 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 39 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
| 40 | no_devices = (dev == NULL); |
| 41 | put_device(dev); |
| 42 | return no_devices; |
| 43 | } |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 44 | EXPORT_SYMBOL(no_pci_devices); |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | /* |
| 47 | * PCI Bus Class Devices |
| 48 | */ |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 49 | static ssize_t pci_bus_show_cpuaffinity(struct device *dev, |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 50 | int type, |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 51 | struct device_attribute *attr, |
Alan Cox | 4327edf | 2005-09-10 00:25:49 -0700 | [diff] [blame] | 52 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | int ret; |
Mike Travis | 588235b | 2009-01-04 05:18:02 -0800 | [diff] [blame] | 55 | const struct cpumask *cpumask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Mike Travis | 588235b | 2009-01-04 05:18:02 -0800 | [diff] [blame] | 57 | cpumask = cpumask_of_pcibus(to_pci_bus(dev)); |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 58 | ret = type? |
Mike Travis | 588235b | 2009-01-04 05:18:02 -0800 | [diff] [blame] | 59 | cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) : |
| 60 | cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask); |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 61 | buf[ret++] = '\n'; |
| 62 | buf[ret] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | return ret; |
| 64 | } |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 65 | |
| 66 | static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev, |
| 67 | struct device_attribute *attr, |
| 68 | char *buf) |
| 69 | { |
| 70 | return pci_bus_show_cpuaffinity(dev, 0, attr, buf); |
| 71 | } |
| 72 | |
| 73 | static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev, |
| 74 | struct device_attribute *attr, |
| 75 | char *buf) |
| 76 | { |
| 77 | return pci_bus_show_cpuaffinity(dev, 1, attr, buf); |
| 78 | } |
| 79 | |
| 80 | DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL); |
| 81 | DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | /* |
| 84 | * PCI Bus Class |
| 85 | */ |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 86 | static void release_pcibus_dev(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 88 | struct pci_bus *pci_bus = to_pci_bus(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | if (pci_bus->bridge) |
| 91 | put_device(pci_bus->bridge); |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 92 | pci_bus_remove_resources(pci_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | kfree(pci_bus); |
| 94 | } |
| 95 | |
| 96 | static struct class pcibus_class = { |
| 97 | .name = "pci_bus", |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 98 | .dev_release = &release_pcibus_dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | static int __init pcibus_class_init(void) |
| 102 | { |
| 103 | return class_register(&pcibus_class); |
| 104 | } |
| 105 | postcore_initcall(pcibus_class_init); |
| 106 | |
| 107 | /* |
| 108 | * Translate the low bits of the PCI base |
| 109 | * to the resource type |
| 110 | */ |
| 111 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) |
| 112 | { |
| 113 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) |
| 114 | return IORESOURCE_IO; |
| 115 | |
| 116 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) |
| 117 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| 118 | |
| 119 | return IORESOURCE_MEM; |
| 120 | } |
| 121 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 122 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 123 | { |
| 124 | u64 size = mask & maxbase; /* Find the significant bits */ |
| 125 | if (!size) |
| 126 | return 0; |
| 127 | |
| 128 | /* Get the lowest of them to find the decode size, and |
| 129 | from that the extent. */ |
| 130 | size = (size & ~(size-1)) - 1; |
| 131 | |
| 132 | /* base == maxbase can be valid only if the BAR has |
| 133 | already been programmed with all 1s. */ |
| 134 | if (base == maxbase && ((base | size) & mask) != mask) |
| 135 | return 0; |
| 136 | |
| 137 | return size; |
| 138 | } |
| 139 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 140 | static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar) |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 141 | { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 142 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { |
| 143 | res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; |
| 144 | return pci_bar_io; |
| 145 | } |
| 146 | |
| 147 | res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
| 148 | |
Peter Chubb | e354597 | 2008-10-13 11:49:04 +1100 | [diff] [blame] | 149 | if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 150 | return pci_bar_mem64; |
| 151 | return pci_bar_mem32; |
| 152 | } |
| 153 | |
Yu Zhao | 0b400c7 | 2008-11-22 02:40:40 +0800 | [diff] [blame] | 154 | /** |
| 155 | * pci_read_base - read a PCI BAR |
| 156 | * @dev: the PCI device |
| 157 | * @type: type of the BAR |
| 158 | * @res: resource buffer to be filled in |
| 159 | * @pos: BAR position in the config space |
| 160 | * |
| 161 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 162 | */ |
Yu Zhao | 0b400c7 | 2008-11-22 02:40:40 +0800 | [diff] [blame] | 163 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 164 | struct resource *res, unsigned int pos) |
| 165 | { |
| 166 | u32 l, sz, mask; |
| 167 | |
Michael S. Tsirkin | 1ed6743 | 2009-10-29 17:24:59 +0200 | [diff] [blame] | 168 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 169 | |
| 170 | res->name = pci_name(dev); |
| 171 | |
| 172 | pci_read_config_dword(dev, pos, &l); |
Michael S. Tsirkin | 1ed6743 | 2009-10-29 17:24:59 +0200 | [diff] [blame] | 173 | pci_write_config_dword(dev, pos, l | mask); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 174 | pci_read_config_dword(dev, pos, &sz); |
| 175 | pci_write_config_dword(dev, pos, l); |
| 176 | |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 177 | if (!sz) |
| 178 | goto fail; /* BAR not implemented */ |
| 179 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 180 | /* |
| 181 | * All bits set in sz means the device isn't working properly. |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 182 | * If it's a memory BAR or a ROM, bit 0 must be clear; if it's |
| 183 | * an io BAR, bit 1 must be clear. |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 184 | */ |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 185 | if (sz == 0xffffffff) { |
| 186 | dev_err(&dev->dev, "reg %x: invalid size %#x; broken device?\n", |
| 187 | pos, sz); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 188 | goto fail; |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 189 | } |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 190 | |
| 191 | /* |
| 192 | * I don't know how l can have all bits set. Copied from old code. |
| 193 | * Maybe it fixes a bug on some ancient platform. |
| 194 | */ |
| 195 | if (l == 0xffffffff) |
| 196 | l = 0; |
| 197 | |
| 198 | if (type == pci_bar_unknown) { |
| 199 | type = decode_bar(res, l); |
| 200 | res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN; |
| 201 | if (type == pci_bar_io) { |
| 202 | l &= PCI_BASE_ADDRESS_IO_MASK; |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 203 | mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 204 | } else { |
| 205 | l &= PCI_BASE_ADDRESS_MEM_MASK; |
| 206 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; |
| 207 | } |
| 208 | } else { |
| 209 | res->flags |= (l & IORESOURCE_ROM_ENABLE); |
| 210 | l &= PCI_ROM_ADDRESS_MASK; |
| 211 | mask = (u32)PCI_ROM_ADDRESS_MASK; |
| 212 | } |
| 213 | |
| 214 | if (type == pci_bar_mem64) { |
| 215 | u64 l64 = l; |
| 216 | u64 sz64 = sz; |
| 217 | u64 mask64 = mask | (u64)~0 << 32; |
| 218 | |
| 219 | pci_read_config_dword(dev, pos + 4, &l); |
| 220 | pci_write_config_dword(dev, pos + 4, ~0); |
| 221 | pci_read_config_dword(dev, pos + 4, &sz); |
| 222 | pci_write_config_dword(dev, pos + 4, l); |
| 223 | |
| 224 | l64 |= ((u64)l << 32); |
| 225 | sz64 |= ((u64)sz << 32); |
| 226 | |
| 227 | sz64 = pci_size(l64, sz64, mask64); |
| 228 | |
| 229 | if (!sz64) |
| 230 | goto fail; |
| 231 | |
Matthew Wilcox | cc5499c | 2008-07-28 13:39:00 -0400 | [diff] [blame] | 232 | if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) { |
Bjorn Helgaas | 865df57 | 2009-11-04 10:32:57 -0700 | [diff] [blame] | 233 | dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", |
| 234 | pos); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 235 | goto fail; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | res->flags |= IORESOURCE_MEM_64; |
| 239 | if ((sizeof(resource_size_t) < 8) && l) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 240 | /* Address above 32-bit boundary; disable the BAR */ |
| 241 | pci_write_config_dword(dev, pos, 0); |
| 242 | pci_write_config_dword(dev, pos + 4, 0); |
| 243 | res->start = 0; |
| 244 | res->end = sz64; |
| 245 | } else { |
| 246 | res->start = l64; |
| 247 | res->end = l64 + sz64; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 248 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", |
Bjorn Helgaas | a369c79 | 2009-10-06 15:33:44 -0600 | [diff] [blame] | 249 | pos, res); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 250 | } |
| 251 | } else { |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 252 | u32 size = pci_size(l, sz, mask); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 253 | |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 254 | if (!size) { |
| 255 | dev_err(&dev->dev, "reg %x: invalid size " |
| 256 | "(l %#x sz %#x mask %#x); broken device?", |
| 257 | pos, l, sz, mask); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 258 | goto fail; |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 259 | } |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 260 | |
| 261 | res->start = l; |
Bjorn Helgaas | c519a5a | 2010-03-19 14:56:27 -0600 | [diff] [blame] | 262 | res->end = l + size; |
Vincent Legoll | f393d9b | 2008-10-12 12:26:12 +0200 | [diff] [blame] | 263 | |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 264 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | out: |
| 268 | return (type == pci_bar_mem64) ? 1 : 0; |
| 269 | fail: |
| 270 | res->flags = 0; |
| 271 | goto out; |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 272 | } |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
| 275 | { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 276 | unsigned int pos, reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 278 | for (pos = 0; pos < howmany; pos++) { |
| 279 | struct resource *res = &dev->resource[pos]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 281 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | if (rom) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 285 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | dev->rom_base_reg = rom; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 287 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
| 288 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | |
| 289 | IORESOURCE_SIZEALIGN; |
| 290 | __pci_read_base(dev, pci_bar_mem32, res, rom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | } |
| 293 | |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 294 | static void __devinit pci_read_bridge_io(struct pci_bus *child) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | { |
| 296 | struct pci_dev *dev = child->self; |
| 297 | u8 io_base_lo, io_limit_lo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | unsigned long base, limit; |
| 299 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | res = child->resource[0]; |
| 302 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); |
| 303 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); |
| 304 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; |
| 305 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; |
| 306 | |
| 307 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { |
| 308 | u16 io_base_hi, io_limit_hi; |
| 309 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
| 310 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); |
| 311 | base |= (io_base_hi << 16); |
| 312 | limit |= (io_limit_hi << 16); |
| 313 | } |
| 314 | |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 315 | if (base && base <= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
Daniel Yeisley | 9d26512 | 2005-12-05 07:06:43 -0500 | [diff] [blame] | 317 | if (!res->start) |
| 318 | res->start = base; |
| 319 | if (!res->end) |
| 320 | res->end = limit + 0xfff; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 321 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 322 | } else { |
| 323 | dev_printk(KERN_DEBUG, &dev->dev, |
Bjorn Helgaas | 7b8ff6d | 2010-03-16 15:53:03 -0600 | [diff] [blame] | 324 | " bridge window [io %#06lx-%#06lx] (disabled)\n", |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 325 | base, limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | static void __devinit pci_read_bridge_mmio(struct pci_bus *child) |
| 330 | { |
| 331 | struct pci_dev *dev = child->self; |
| 332 | u16 mem_base_lo, mem_limit_lo; |
| 333 | unsigned long base, limit; |
| 334 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
| 336 | res = child->resource[1]; |
| 337 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); |
| 338 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); |
| 339 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| 340 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 341 | if (base && base <= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
| 343 | res->start = base; |
| 344 | res->end = limit + 0xfffff; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 345 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 346 | } else { |
| 347 | dev_printk(KERN_DEBUG, &dev->dev, |
Bjorn Helgaas | 7b8ff6d | 2010-03-16 15:53:03 -0600 | [diff] [blame] | 348 | " bridge window [mem %#010lx-%#010lx] (disabled)\n", |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 349 | base, limit + 0xfffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child) |
| 354 | { |
| 355 | struct pci_dev *dev = child->self; |
| 356 | u16 mem_base_lo, mem_limit_lo; |
| 357 | unsigned long base, limit; |
| 358 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
| 360 | res = child->resource[2]; |
| 361 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); |
| 362 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); |
| 363 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
| 364 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; |
| 365 | |
| 366 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { |
| 367 | u32 mem_base_hi, mem_limit_hi; |
| 368 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
| 369 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); |
| 370 | |
| 371 | /* |
| 372 | * Some bridges set the base > limit by default, and some |
| 373 | * (broken) BIOSes do not initialize them. If we find |
| 374 | * this, just assume they are not being used. |
| 375 | */ |
| 376 | if (mem_base_hi <= mem_limit_hi) { |
| 377 | #if BITS_PER_LONG == 64 |
| 378 | base |= ((long) mem_base_hi) << 32; |
| 379 | limit |= ((long) mem_limit_hi) << 32; |
| 380 | #else |
| 381 | if (mem_base_hi || mem_limit_hi) { |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 382 | dev_err(&dev->dev, "can't handle 64-bit " |
| 383 | "address space for bridge\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | return; |
| 385 | } |
| 386 | #endif |
| 387 | } |
| 388 | } |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 389 | if (base && base <= limit) { |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 390 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
| 391 | IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| 392 | if (res->flags & PCI_PREF_RANGE_TYPE_64) |
| 393 | res->flags |= IORESOURCE_MEM_64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | res->start = base; |
| 395 | res->end = limit + 0xfffff; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 396 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 397 | } else { |
| 398 | dev_printk(KERN_DEBUG, &dev->dev, |
Bjorn Helgaas | 7b8ff6d | 2010-03-16 15:53:03 -0600 | [diff] [blame] | 399 | " bridge window [mem %#010lx-%#010lx pref] (disabled)\n", |
Yinghai Lu | cd81e1e | 2010-01-22 01:02:22 -0800 | [diff] [blame] | 400 | base, limit + 0xfffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | } |
| 403 | |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 404 | void __devinit pci_read_bridge_bases(struct pci_bus *child) |
| 405 | { |
| 406 | struct pci_dev *dev = child->self; |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 407 | struct resource *res; |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 408 | int i; |
| 409 | |
| 410 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ |
| 411 | return; |
| 412 | |
| 413 | dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n", |
| 414 | child->secondary, child->subordinate, |
| 415 | dev->transparent ? " (subtractive decode)" : ""); |
| 416 | |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 417 | pci_bus_remove_resources(child); |
| 418 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) |
| 419 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; |
| 420 | |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 421 | pci_read_bridge_io(child); |
| 422 | pci_read_bridge_mmio(child); |
| 423 | pci_read_bridge_mmio_pref(child); |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 424 | |
| 425 | if (dev->transparent) { |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 426 | pci_bus_for_each_resource(child->parent, res, i) { |
| 427 | if (res) { |
| 428 | pci_bus_add_resource(child, res, |
| 429 | PCI_SUBTRACTIVE_DECODE); |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 430 | dev_printk(KERN_DEBUG, &dev->dev, |
| 431 | " bridge window %pR (subtractive decode)\n", |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 432 | res); |
| 433 | } |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 434 | } |
| 435 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 438 | static struct pci_bus * pci_alloc_bus(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | { |
| 440 | struct pci_bus *b; |
| 441 | |
Eric Sesterhenn | f5afe80 | 2006-02-28 15:34:49 +0100 | [diff] [blame] | 442 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | if (b) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | INIT_LIST_HEAD(&b->node); |
| 445 | INIT_LIST_HEAD(&b->children); |
| 446 | INIT_LIST_HEAD(&b->devices); |
Alex Chiang | f46753c | 2008-06-10 15:28:50 -0600 | [diff] [blame] | 447 | INIT_LIST_HEAD(&b->slots); |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 448 | INIT_LIST_HEAD(&b->resources); |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 449 | b->max_bus_speed = PCI_SPEED_UNKNOWN; |
| 450 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | return b; |
| 453 | } |
| 454 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 455 | static unsigned char pcix_bus_speed[] = { |
| 456 | PCI_SPEED_UNKNOWN, /* 0 */ |
| 457 | PCI_SPEED_66MHz_PCIX, /* 1 */ |
| 458 | PCI_SPEED_100MHz_PCIX, /* 2 */ |
| 459 | PCI_SPEED_133MHz_PCIX, /* 3 */ |
| 460 | PCI_SPEED_UNKNOWN, /* 4 */ |
| 461 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ |
| 462 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ |
| 463 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ |
| 464 | PCI_SPEED_UNKNOWN, /* 8 */ |
| 465 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ |
| 466 | PCI_SPEED_100MHz_PCIX_266, /* A */ |
| 467 | PCI_SPEED_133MHz_PCIX_266, /* B */ |
| 468 | PCI_SPEED_UNKNOWN, /* C */ |
| 469 | PCI_SPEED_66MHz_PCIX_533, /* D */ |
| 470 | PCI_SPEED_100MHz_PCIX_533, /* E */ |
| 471 | PCI_SPEED_133MHz_PCIX_533 /* F */ |
| 472 | }; |
| 473 | |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 474 | static unsigned char pcie_link_speed[] = { |
| 475 | PCI_SPEED_UNKNOWN, /* 0 */ |
| 476 | PCIE_SPEED_2_5GT, /* 1 */ |
| 477 | PCIE_SPEED_5_0GT, /* 2 */ |
Matthew Wilcox | 9dfd97f | 2009-12-13 08:11:35 -0500 | [diff] [blame] | 478 | PCIE_SPEED_8_0GT, /* 3 */ |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 479 | PCI_SPEED_UNKNOWN, /* 4 */ |
| 480 | PCI_SPEED_UNKNOWN, /* 5 */ |
| 481 | PCI_SPEED_UNKNOWN, /* 6 */ |
| 482 | PCI_SPEED_UNKNOWN, /* 7 */ |
| 483 | PCI_SPEED_UNKNOWN, /* 8 */ |
| 484 | PCI_SPEED_UNKNOWN, /* 9 */ |
| 485 | PCI_SPEED_UNKNOWN, /* A */ |
| 486 | PCI_SPEED_UNKNOWN, /* B */ |
| 487 | PCI_SPEED_UNKNOWN, /* C */ |
| 488 | PCI_SPEED_UNKNOWN, /* D */ |
| 489 | PCI_SPEED_UNKNOWN, /* E */ |
| 490 | PCI_SPEED_UNKNOWN /* F */ |
| 491 | }; |
| 492 | |
| 493 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) |
| 494 | { |
| 495 | bus->cur_bus_speed = pcie_link_speed[linksta & 0xf]; |
| 496 | } |
| 497 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); |
| 498 | |
Matthew Wilcox | 45b4cdd5 | 2009-12-13 08:11:34 -0500 | [diff] [blame] | 499 | static unsigned char agp_speeds[] = { |
| 500 | AGP_UNKNOWN, |
| 501 | AGP_1X, |
| 502 | AGP_2X, |
| 503 | AGP_4X, |
| 504 | AGP_8X |
| 505 | }; |
| 506 | |
| 507 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) |
| 508 | { |
| 509 | int index = 0; |
| 510 | |
| 511 | if (agpstat & 4) |
| 512 | index = 3; |
| 513 | else if (agpstat & 2) |
| 514 | index = 2; |
| 515 | else if (agpstat & 1) |
| 516 | index = 1; |
| 517 | else |
| 518 | goto out; |
| 519 | |
| 520 | if (agp3) { |
| 521 | index += 2; |
| 522 | if (index == 5) |
| 523 | index = 0; |
| 524 | } |
| 525 | |
| 526 | out: |
| 527 | return agp_speeds[index]; |
| 528 | } |
| 529 | |
| 530 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 531 | static void pci_set_bus_speed(struct pci_bus *bus) |
| 532 | { |
| 533 | struct pci_dev *bridge = bus->self; |
| 534 | int pos; |
| 535 | |
Matthew Wilcox | 45b4cdd5 | 2009-12-13 08:11:34 -0500 | [diff] [blame] | 536 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
| 537 | if (!pos) |
| 538 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); |
| 539 | if (pos) { |
| 540 | u32 agpstat, agpcmd; |
| 541 | |
| 542 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); |
| 543 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); |
| 544 | |
| 545 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); |
| 546 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); |
| 547 | } |
| 548 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 549 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
| 550 | if (pos) { |
| 551 | u16 status; |
| 552 | enum pci_bus_speed max; |
| 553 | pci_read_config_word(bridge, pos + 2, &status); |
| 554 | |
| 555 | if (status & 0x8000) { |
| 556 | max = PCI_SPEED_133MHz_PCIX_533; |
| 557 | } else if (status & 0x4000) { |
| 558 | max = PCI_SPEED_133MHz_PCIX_266; |
| 559 | } else if (status & 0x0002) { |
| 560 | if (((status >> 12) & 0x3) == 2) { |
| 561 | max = PCI_SPEED_133MHz_PCIX_ECC; |
| 562 | } else { |
| 563 | max = PCI_SPEED_133MHz_PCIX; |
| 564 | } |
| 565 | } else { |
| 566 | max = PCI_SPEED_66MHz_PCIX; |
| 567 | } |
| 568 | |
| 569 | bus->max_bus_speed = max; |
| 570 | bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf]; |
| 571 | |
| 572 | return; |
| 573 | } |
| 574 | |
| 575 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); |
| 576 | if (pos) { |
| 577 | u32 linkcap; |
| 578 | u16 linksta; |
| 579 | |
| 580 | pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap); |
| 581 | bus->max_bus_speed = pcie_link_speed[linkcap & 0xf]; |
| 582 | |
| 583 | pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta); |
| 584 | pcie_update_link_speed(bus, linksta); |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | |
Adrian Bunk | cbd4e05 | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 589 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
| 590 | struct pci_dev *bridge, int busnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | struct pci_bus *child; |
| 593 | int i; |
| 594 | |
| 595 | /* |
| 596 | * Allocate a new bus, and inherit stuff from the parent.. |
| 597 | */ |
| 598 | child = pci_alloc_bus(); |
| 599 | if (!child) |
| 600 | return NULL; |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | child->parent = parent; |
| 603 | child->ops = parent->ops; |
| 604 | child->sysdata = parent->sysdata; |
Michael S. Tsirkin | 6e325a6 | 2006-02-14 18:52:22 +0200 | [diff] [blame] | 605 | child->bus_flags = parent->bus_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 607 | /* initialize some portions of the bus device, but don't register it |
| 608 | * now as the parent is not properly set up yet. This device will get |
| 609 | * registered later in pci_bus_add_devices() |
| 610 | */ |
| 611 | child->dev.class = &pcibus_class; |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 612 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
| 614 | /* |
| 615 | * Set up the primary, secondary and subordinate |
| 616 | * bus numbers. |
| 617 | */ |
| 618 | child->number = child->secondary = busnr; |
| 619 | child->primary = parent->secondary; |
| 620 | child->subordinate = 0xff; |
| 621 | |
Yu Zhao | 3789fa8 | 2008-11-22 02:41:07 +0800 | [diff] [blame] | 622 | if (!bridge) |
| 623 | return child; |
| 624 | |
| 625 | child->self = bridge; |
| 626 | child->bridge = get_device(&bridge->dev); |
| 627 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 628 | pci_set_bus_speed(child); |
| 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* Set up default resource pointers and names.. */ |
Yu Zhao | fde09c6 | 2008-11-22 02:39:32 +0800 | [diff] [blame] | 631 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
| 633 | child->resource[i]->name = child->name; |
| 634 | } |
| 635 | bridge->subordinate = child; |
| 636 | |
| 637 | return child; |
| 638 | } |
| 639 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 640 | 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] | 641 | { |
| 642 | struct pci_bus *child; |
| 643 | |
| 644 | child = pci_alloc_child_bus(parent, dev, busnr); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 645 | if (child) { |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 646 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | list_add_tail(&child->node, &parent->children); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 648 | up_write(&pci_bus_sem); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 649 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | return child; |
| 651 | } |
| 652 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 653 | 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] | 654 | { |
| 655 | struct pci_bus *parent = child->parent; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 656 | |
| 657 | /* Attempts to fix that up are really dangerous unless |
| 658 | we're going to re-assign all bus numbers. */ |
| 659 | if (!pcibios_assign_all_busses()) |
| 660 | return; |
| 661 | |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 662 | while (parent->parent && parent->subordinate < max) { |
| 663 | parent->subordinate = max; |
| 664 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); |
| 665 | parent = parent->parent; |
| 666 | } |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* |
| 670 | * If it's a bridge, configure it and scan the bus behind it. |
| 671 | * For CardBus bridges, we don't scan behind as the devices will |
| 672 | * be handled by the bridge driver itself. |
| 673 | * |
| 674 | * We need to process bridges in two passes -- first we scan those |
| 675 | * already configured by the BIOS and after we are done with all of |
| 676 | * them, we proceed to assigning numbers to the remaining buses in |
| 677 | * order to avoid overlaps between old and new bus numbers. |
| 678 | */ |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 679 | 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] | 680 | { |
| 681 | struct pci_bus *child; |
| 682 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 683 | u32 buses, i, j = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | u16 bctl; |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 685 | u8 primary, secondary, subordinate; |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 686 | int broken = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 689 | primary = buses & 0xFF; |
| 690 | secondary = (buses >> 8) & 0xFF; |
| 691 | subordinate = (buses >> 16) & 0xFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 693 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
| 694 | secondary, subordinate, pass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 696 | /* Check if setup is sensible at all */ |
| 697 | if (!pass && |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 698 | (primary != bus->number || secondary <= bus->number)) { |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 699 | dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n"); |
| 700 | broken = 1; |
| 701 | } |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | /* Disable MasterAbortMode during probing to avoid reporting |
| 704 | of bus errors (in some architectures) */ |
| 705 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
| 706 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, |
| 707 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); |
| 708 | |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 709 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
| 710 | !is_cardbus && !broken) { |
| 711 | unsigned int cmax; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | /* |
| 713 | * Bus already configured by firmware, process it in the first |
| 714 | * pass and just note the configuration. |
| 715 | */ |
| 716 | if (pass) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 717 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | /* |
| 720 | * If we already got to this bus through a different bridge, |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 721 | * don't re-add it. This can happen with the i450NX chipset. |
| 722 | * |
| 723 | * However, we continue to descend down the hierarchy and |
| 724 | * scan remaining child buses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | */ |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 726 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 727 | if (!child) { |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 728 | child = pci_add_new_bus(bus, dev, secondary); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 729 | if (!child) |
| 730 | goto out; |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 731 | child->primary = primary; |
| 732 | child->subordinate = subordinate; |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 733 | child->bridge_ctl = bctl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | cmax = pci_scan_child_bus(child); |
| 737 | if (cmax > max) |
| 738 | max = cmax; |
| 739 | if (child->subordinate > max) |
| 740 | max = child->subordinate; |
| 741 | } else { |
| 742 | /* |
| 743 | * We need to assign a number to this bus which we always |
| 744 | * do in the second pass. |
| 745 | */ |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 746 | if (!pass) { |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 747 | if (pcibios_assign_all_busses() || broken) |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 748 | /* Temporarily disable forwarding of the |
| 749 | configuration cycles on all bridges in |
| 750 | this bus segment to avoid possible |
| 751 | conflicts in the second pass between two |
| 752 | bridges programmed with overlapping |
| 753 | bus ranges. */ |
| 754 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, |
| 755 | buses & ~0xffffff); |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 756 | goto out; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
| 759 | /* Clear errors */ |
| 760 | pci_write_config_word(dev, PCI_STATUS, 0xffff); |
| 761 | |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 762 | /* Prevent assigning a bus number that already exists. |
| 763 | * This can happen when a bridge is hot-plugged */ |
| 764 | if (pci_find_bus(pci_domain_nr(bus), max+1)) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 765 | goto out; |
Rajesh Shah | 6ef6f0e | 2005-04-28 00:25:49 -0700 | [diff] [blame] | 766 | child = pci_add_new_bus(bus, dev, ++max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | buses = (buses & 0xff000000) |
| 768 | | ((unsigned int)(child->primary) << 0) |
| 769 | | ((unsigned int)(child->secondary) << 8) |
| 770 | | ((unsigned int)(child->subordinate) << 16); |
| 771 | |
| 772 | /* |
| 773 | * yenta.c forces a secondary latency timer of 176. |
| 774 | * Copy that behaviour here. |
| 775 | */ |
| 776 | if (is_cardbus) { |
| 777 | buses &= ~0xff000000; |
| 778 | buses |= CARDBUS_LATENCY_TIMER << 24; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * We need to blast all three values with a single write. |
| 783 | */ |
| 784 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); |
| 785 | |
| 786 | if (!is_cardbus) { |
Gary Hade | 1194925 | 2007-10-08 16:24:16 -0700 | [diff] [blame] | 787 | child->bridge_ctl = bctl; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 788 | /* |
| 789 | * Adjust subordinate busnr in parent buses. |
| 790 | * We do this before scanning for children because |
| 791 | * some devices may not be detected if the bios |
| 792 | * was lazy. |
| 793 | */ |
| 794 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | /* Now we can scan all subordinate buses... */ |
| 796 | max = pci_scan_child_bus(child); |
Kristen Accardi | e3ac86d | 2006-01-17 16:57:01 -0800 | [diff] [blame] | 797 | /* |
| 798 | * now fix it up again since we have found |
| 799 | * the real value of max. |
| 800 | */ |
| 801 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } else { |
| 803 | /* |
| 804 | * For CardBus bridges, we leave 4 bus numbers |
| 805 | * as cards with a PCI-to-PCI bridge can be |
| 806 | * inserted later. |
| 807 | */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 808 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
| 809 | struct pci_bus *parent = bus; |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 810 | if (pci_find_bus(pci_domain_nr(bus), |
| 811 | max+i+1)) |
| 812 | break; |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 813 | while (parent->parent) { |
| 814 | if ((!pcibios_assign_all_busses()) && |
| 815 | (parent->subordinate > max) && |
| 816 | (parent->subordinate <= max+i)) { |
| 817 | j = 1; |
| 818 | } |
| 819 | parent = parent->parent; |
| 820 | } |
| 821 | if (j) { |
| 822 | /* |
| 823 | * Often, there are two cardbus bridges |
| 824 | * -- try to leave one valid bus number |
| 825 | * for each one. |
| 826 | */ |
| 827 | i /= 2; |
| 828 | break; |
| 829 | } |
| 830 | } |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 831 | max += i; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 832 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
| 834 | /* |
| 835 | * Set the subordinate bus number to its real value. |
| 836 | */ |
| 837 | child->subordinate = max; |
| 838 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
| 839 | } |
| 840 | |
Gary Hade | cb3576f | 2008-02-08 14:00:52 -0800 | [diff] [blame] | 841 | sprintf(child->name, |
| 842 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), |
| 843 | pci_domain_nr(bus), child->number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 845 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 846 | while (bus->parent) { |
| 847 | if ((child->subordinate > bus->subordinate) || |
| 848 | (child->number > bus->subordinate) || |
| 849 | (child->number < bus->number) || |
| 850 | (child->subordinate < bus->number)) { |
Bjorn Helgaas | 865df57 | 2009-11-04 10:32:57 -0700 | [diff] [blame] | 851 | dev_info(&child->dev, "[bus %02x-%02x] %s " |
| 852 | "hidden behind%s bridge %s [bus %02x-%02x]\n", |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 853 | child->number, child->subordinate, |
| 854 | (bus->number > child->subordinate && |
| 855 | bus->subordinate < child->number) ? |
Joe Perches | a6f29a9 | 2007-11-19 17:48:29 -0800 | [diff] [blame] | 856 | "wholly" : "partially", |
| 857 | bus->self->transparent ? " transparent" : "", |
Bjorn Helgaas | 865df57 | 2009-11-04 10:32:57 -0700 | [diff] [blame] | 858 | dev_name(&bus->dev), |
Bernhard Kaindl | d55bef5 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 859 | bus->number, bus->subordinate); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 860 | } |
| 861 | bus = bus->parent; |
| 862 | } |
| 863 | |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 864 | out: |
| 865 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); |
| 866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return max; |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Read interrupt line and base address registers. |
| 872 | * The architecture-dependent code can tweak these, of course. |
| 873 | */ |
| 874 | static void pci_read_irq(struct pci_dev *dev) |
| 875 | { |
| 876 | unsigned char irq; |
| 877 | |
| 878 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); |
Kristen Accardi | ffeff78 | 2005-11-02 16:24:32 -0800 | [diff] [blame] | 879 | dev->pin = irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | if (irq) |
| 881 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); |
| 882 | dev->irq = irq; |
| 883 | } |
| 884 | |
Benjamin Herrenschmidt | bb209c8 | 2010-01-26 17:10:03 +0000 | [diff] [blame] | 885 | void set_pcie_port_type(struct pci_dev *pdev) |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 886 | { |
| 887 | int pos; |
| 888 | u16 reg16; |
| 889 | |
| 890 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); |
| 891 | if (!pos) |
| 892 | return; |
| 893 | pdev->is_pcie = 1; |
Kenji Kaneshige | 0efea00 | 2009-11-05 12:05:11 +0900 | [diff] [blame] | 894 | pdev->pcie_cap = pos; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 895 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
| 896 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; |
| 897 | } |
| 898 | |
Benjamin Herrenschmidt | bb209c8 | 2010-01-26 17:10:03 +0000 | [diff] [blame] | 899 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 900 | { |
| 901 | int pos; |
| 902 | u16 reg16; |
| 903 | u32 reg32; |
| 904 | |
Kenji Kaneshige | 06a1cba | 2009-11-11 14:30:56 +0900 | [diff] [blame] | 905 | pos = pci_pcie_cap(pdev); |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 906 | if (!pos) |
| 907 | return; |
| 908 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
| 909 | if (!(reg16 & PCI_EXP_FLAGS_SLOT)) |
| 910 | return; |
| 911 | pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32); |
| 912 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
| 913 | pdev->is_hotplug_bridge = 1; |
| 914 | } |
| 915 | |
Matt Domsch | 0584396 | 2009-11-02 11:51:24 -0600 | [diff] [blame] | 916 | static void set_pci_aer_firmware_first(struct pci_dev *pdev) |
| 917 | { |
| 918 | if (acpi_hest_firmware_first_pci(pdev)) |
| 919 | pdev->aer_firmware_first = 1; |
| 920 | } |
| 921 | |
Bartlomiej Zolnierkiewicz | 01abc2a | 2007-04-23 23:19:36 +0200 | [diff] [blame] | 922 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
Randy Dunlap | 76e6a1d | 2006-12-29 16:47:29 -0800 | [diff] [blame] | 923 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | /** |
| 925 | * pci_setup_device - fill in class and map information of a device |
| 926 | * @dev: the device structure to fill |
| 927 | * |
| 928 | * Initialize the device structure with information about the device's |
| 929 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
| 930 | * Called at initialisation of the PCI subsystem and by CardBus services. |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 931 | * Returns 0 on success and negative if unknown type of device (not normal, |
| 932 | * bridge or CardBus). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | */ |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 934 | int pci_setup_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | { |
| 936 | u32 class; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 937 | u8 hdr_type; |
| 938 | struct pci_slot *slot; |
Gabe Black | bc577d2 | 2009-10-06 10:45:19 -0500 | [diff] [blame] | 939 | int pos = 0; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 940 | |
| 941 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) |
| 942 | return -EIO; |
| 943 | |
| 944 | dev->sysdata = dev->bus->sysdata; |
| 945 | dev->dev.parent = dev->bus->bridge; |
| 946 | dev->dev.bus = &pci_bus_type; |
| 947 | dev->hdr_type = hdr_type & 0x7f; |
| 948 | dev->multifunction = !!(hdr_type & 0x80); |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 949 | dev->error_state = pci_channel_io_normal; |
| 950 | set_pcie_port_type(dev); |
Matt Domsch | 0584396 | 2009-11-02 11:51:24 -0600 | [diff] [blame] | 951 | set_pci_aer_firmware_first(dev); |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 952 | |
| 953 | list_for_each_entry(slot, &dev->bus->slots, list) |
| 954 | if (PCI_SLOT(dev->devfn) == slot->number) |
| 955 | dev->slot = slot; |
| 956 | |
| 957 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) |
| 958 | set this higher, assuming the system even supports it. */ |
| 959 | dev->dma_mask = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
Greg Kroah-Hartman | eebfcfb | 2008-07-02 13:24:49 -0700 | [diff] [blame] | 961 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
| 962 | dev->bus->number, PCI_SLOT(dev->devfn), |
| 963 | PCI_FUNC(dev->devfn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | |
| 965 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); |
Auke Kok | b8a3a52 | 2007-06-08 15:46:30 -0700 | [diff] [blame] | 966 | dev->revision = class & 0xff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | class >>= 8; /* upper 3 bytes */ |
| 968 | dev->class = class; |
| 969 | class >>= 8; |
| 970 | |
Bjorn Helgaas | 34a2e15 | 2008-08-25 15:45:20 -0600 | [diff] [blame] | 971 | dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | dev->vendor, dev->device, class, dev->hdr_type); |
| 973 | |
Yu Zhao | 853346e | 2009-03-21 22:05:11 +0800 | [diff] [blame] | 974 | /* need to have dev->class ready */ |
| 975 | dev->cfg_size = pci_cfg_space_size(dev); |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | /* "Unknown power state" */ |
Daniel Ritz | 3fe9d19 | 2005-08-17 15:32:19 -0700 | [diff] [blame] | 978 | dev->current_state = PCI_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
| 980 | /* Early fixups, before probing the BARs */ |
| 981 | pci_fixup_device(pci_fixup_early, dev); |
Yu Zhao | f79b1b1 | 2009-05-28 00:25:05 +0800 | [diff] [blame] | 982 | /* device class may be changed after fixup */ |
| 983 | class = dev->class >> 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | switch (dev->hdr_type) { /* header type */ |
| 986 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| 987 | if (class == PCI_CLASS_BRIDGE_PCI) |
| 988 | goto bad; |
| 989 | pci_read_irq(dev); |
| 990 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); |
| 991 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 992 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 993 | |
| 994 | /* |
| 995 | * Do the ugly legacy mode stuff here rather than broken chip |
| 996 | * quirk code. Legacy mode ATA controllers have fixed |
| 997 | * addresses. These are not always echoed in BAR0-3, and |
| 998 | * BAR0-3 in a few cases contain junk! |
| 999 | */ |
| 1000 | if (class == PCI_CLASS_STORAGE_IDE) { |
| 1001 | u8 progif; |
| 1002 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); |
| 1003 | if ((progif & 1) == 0) { |
Linus Torvalds | af1bff4 | 2007-12-10 07:40:54 -0800 | [diff] [blame] | 1004 | dev->resource[0].start = 0x1F0; |
| 1005 | dev->resource[0].end = 0x1F7; |
| 1006 | dev->resource[0].flags = LEGACY_IO_RESOURCE; |
| 1007 | dev->resource[1].start = 0x3F6; |
| 1008 | dev->resource[1].end = 0x3F6; |
| 1009 | dev->resource[1].flags = LEGACY_IO_RESOURCE; |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 1010 | } |
| 1011 | if ((progif & 4) == 0) { |
Linus Torvalds | af1bff4 | 2007-12-10 07:40:54 -0800 | [diff] [blame] | 1012 | dev->resource[2].start = 0x170; |
| 1013 | dev->resource[2].end = 0x177; |
| 1014 | dev->resource[2].flags = LEGACY_IO_RESOURCE; |
| 1015 | dev->resource[3].start = 0x376; |
| 1016 | dev->resource[3].end = 0x376; |
| 1017 | dev->resource[3].flags = LEGACY_IO_RESOURCE; |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 1018 | } |
| 1019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | break; |
| 1021 | |
| 1022 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ |
| 1023 | if (class != PCI_CLASS_BRIDGE_PCI) |
| 1024 | goto bad; |
| 1025 | /* The PCI-to-PCI bridge spec requires that subtractive |
| 1026 | decoding (i.e. transparent) bridge must have programming |
| 1027 | interface code of 0x01. */ |
Kristen Accardi | 3efd273 | 2005-11-02 16:55:49 -0800 | [diff] [blame] | 1028 | pci_read_irq(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | dev->transparent = ((dev->class & 0xff) == 1); |
| 1030 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 1031 | set_pcie_hotplug_bridge(dev); |
Gabe Black | bc577d2 | 2009-10-06 10:45:19 -0500 | [diff] [blame] | 1032 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
| 1033 | if (pos) { |
| 1034 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); |
| 1035 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); |
| 1036 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | break; |
| 1038 | |
| 1039 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ |
| 1040 | if (class != PCI_CLASS_BRIDGE_CARDBUS) |
| 1041 | goto bad; |
| 1042 | pci_read_irq(dev); |
| 1043 | pci_read_bases(dev, 1, 0); |
| 1044 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 1045 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); |
| 1046 | break; |
| 1047 | |
| 1048 | default: /* unknown header */ |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 1049 | dev_err(&dev->dev, "unknown header type %02x, " |
| 1050 | "ignoring device\n", dev->hdr_type); |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1051 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
| 1053 | bad: |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 1054 | dev_err(&dev->dev, "ignoring class %02x (doesn't match header " |
| 1055 | "type %02x)\n", class, dev->hdr_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | dev->class = PCI_CLASS_NOT_DEFINED; |
| 1057 | } |
| 1058 | |
| 1059 | /* We found a fine healthy device, go go go... */ |
| 1060 | return 0; |
| 1061 | } |
| 1062 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1063 | static void pci_release_capabilities(struct pci_dev *dev) |
| 1064 | { |
| 1065 | pci_vpd_release(dev); |
Yu Zhao | d1b054d | 2009-03-20 11:25:11 +0800 | [diff] [blame] | 1066 | pci_iov_release(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1067 | } |
| 1068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | /** |
| 1070 | * pci_release_dev - free a pci device structure when all users of it are finished. |
| 1071 | * @dev: device that's been disconnected |
| 1072 | * |
| 1073 | * Will be called only by the device core when all users of this pci device are |
| 1074 | * done. |
| 1075 | */ |
| 1076 | static void pci_release_dev(struct device *dev) |
| 1077 | { |
| 1078 | struct pci_dev *pci_dev; |
| 1079 | |
| 1080 | pci_dev = to_pci_dev(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1081 | pci_release_capabilities(pci_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | kfree(pci_dev); |
| 1083 | } |
| 1084 | |
| 1085 | /** |
| 1086 | * 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] | 1087 | * @dev: PCI device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | * |
| 1089 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices |
| 1090 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can |
| 1091 | * access it. Maybe we don't have a way to generate extended config space |
| 1092 | * accesses, or the device is behind a reverse Express bridge. So we try |
| 1093 | * reading the dword at 0x100 which must either be 0 or a valid extended |
| 1094 | * capability header. |
| 1095 | */ |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1096 | int pci_cfg_space_size_ext(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | u32 status; |
Zhao, Yu | 557848c | 2008-10-13 19:18:07 +0800 | [diff] [blame] | 1099 | int pos = PCI_CFG_SPACE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
Zhao, Yu | 557848c | 2008-10-13 19:18:07 +0800 | [diff] [blame] | 1101 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | goto fail; |
| 1103 | if (status == 0xffffffff) |
| 1104 | goto fail; |
| 1105 | |
| 1106 | return PCI_CFG_SPACE_EXP_SIZE; |
| 1107 | |
| 1108 | fail: |
| 1109 | return PCI_CFG_SPACE_SIZE; |
| 1110 | } |
| 1111 | |
Yinghai Lu | 57741a7 | 2008-02-15 01:32:50 -0800 | [diff] [blame] | 1112 | int pci_cfg_space_size(struct pci_dev *dev) |
| 1113 | { |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1114 | int pos; |
| 1115 | u32 status; |
Yinghai Lu | dfadd9ed | 2009-03-08 21:35:37 -0700 | [diff] [blame] | 1116 | u16 class; |
| 1117 | |
| 1118 | class = dev->class >> 8; |
| 1119 | if (class == PCI_CLASS_BRIDGE_HOST) |
| 1120 | return pci_cfg_space_size_ext(dev); |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1121 | |
Kenji Kaneshige | 06a1cba | 2009-11-11 14:30:56 +0900 | [diff] [blame] | 1122 | pos = pci_pcie_cap(dev); |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1123 | if (!pos) { |
| 1124 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 1125 | if (!pos) |
| 1126 | goto fail; |
| 1127 | |
| 1128 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); |
| 1129 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) |
| 1130 | goto fail; |
| 1131 | } |
| 1132 | |
| 1133 | return pci_cfg_space_size_ext(dev); |
| 1134 | |
| 1135 | fail: |
| 1136 | return PCI_CFG_SPACE_SIZE; |
Yinghai Lu | 57741a7 | 2008-02-15 01:32:50 -0800 | [diff] [blame] | 1137 | } |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | static void pci_release_bus_bridge_dev(struct device *dev) |
| 1140 | { |
| 1141 | kfree(dev); |
| 1142 | } |
| 1143 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1144 | struct pci_dev *alloc_pci_dev(void) |
| 1145 | { |
| 1146 | struct pci_dev *dev; |
| 1147 | |
| 1148 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); |
| 1149 | if (!dev) |
| 1150 | return NULL; |
| 1151 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1152 | INIT_LIST_HEAD(&dev->bus_list); |
| 1153 | |
| 1154 | return dev; |
| 1155 | } |
| 1156 | EXPORT_SYMBOL(alloc_pci_dev); |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | /* |
| 1159 | * Read the config data for a PCI device, sanity-check it |
| 1160 | * and fill in the dev structure... |
| 1161 | */ |
Adrian Bunk | 7f7b5de | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 1162 | 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] | 1163 | { |
| 1164 | struct pci_dev *dev; |
| 1165 | u32 l; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | int delay = 1; |
| 1167 | |
| 1168 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| 1169 | return NULL; |
| 1170 | |
| 1171 | /* some broken boards return 0 or ~0 if a slot is empty: */ |
| 1172 | if (l == 0xffffffff || l == 0x00000000 || |
| 1173 | l == 0x0000ffff || l == 0xffff0000) |
| 1174 | return NULL; |
| 1175 | |
| 1176 | /* Configuration request Retry Status */ |
| 1177 | while (l == 0xffff0001) { |
| 1178 | msleep(delay); |
| 1179 | delay *= 2; |
| 1180 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| 1181 | return NULL; |
| 1182 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
| 1183 | if (delay > 60 * 1000) { |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 1184 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | "responding\n", pci_domain_nr(bus), |
| 1186 | bus->number, PCI_SLOT(devfn), |
| 1187 | PCI_FUNC(devfn)); |
| 1188 | return NULL; |
| 1189 | } |
| 1190 | } |
| 1191 | |
Michael Ellerman | bab41e9 | 2007-04-05 17:19:09 +1000 | [diff] [blame] | 1192 | dev = alloc_pci_dev(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | if (!dev) |
| 1194 | return NULL; |
| 1195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | dev->bus = bus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | dev->devfn = devfn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | dev->vendor = l & 0xffff; |
| 1199 | dev->device = (l >> 16) & 0xffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1201 | if (pci_setup_device(dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | kfree(dev); |
| 1203 | return NULL; |
| 1204 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1205 | |
| 1206 | return dev; |
| 1207 | } |
| 1208 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1209 | static void pci_init_capabilities(struct pci_dev *dev) |
| 1210 | { |
| 1211 | /* MSI/MSI-X list */ |
| 1212 | pci_msi_init_pci_dev(dev); |
| 1213 | |
Rafael J. Wysocki | 63f4898 | 2008-12-07 22:02:58 +0100 | [diff] [blame] | 1214 | /* Buffers for saving PCIe and PCI-X capabilities */ |
| 1215 | pci_allocate_cap_save_buffers(dev); |
| 1216 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1217 | /* Power Management */ |
| 1218 | pci_pm_init(dev); |
Jesse Barnes | eb9c39d | 2008-12-17 12:10:05 -0800 | [diff] [blame] | 1219 | platform_pci_wakeup_init(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1220 | |
| 1221 | /* Vital Product Data */ |
| 1222 | pci_vpd_pci22_init(dev); |
Yu Zhao | 58c3a72 | 2008-10-14 14:02:53 +0800 | [diff] [blame] | 1223 | |
| 1224 | /* Alternative Routing-ID Forwarding */ |
| 1225 | pci_enable_ari(dev); |
Yu Zhao | d1b054d | 2009-03-20 11:25:11 +0800 | [diff] [blame] | 1226 | |
| 1227 | /* Single Root I/O Virtualization */ |
| 1228 | pci_iov_init(dev); |
Allen Kay | ae21ee6 | 2009-10-07 10:27:17 -0700 | [diff] [blame] | 1229 | |
| 1230 | /* Enable ACS P2P upstream forwarding */ |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1231 | pci_enable_acs(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1232 | } |
| 1233 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1234 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1235 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | device_initialize(&dev->dev); |
| 1237 | dev->dev.release = pci_release_dev; |
| 1238 | pci_dev_get(dev); |
| 1239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | dev->dev.dma_mask = &dev->dma_mask; |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1241 | dev->dev.dma_parms = &dev->dma_parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | dev->dev.coherent_dma_mask = 0xffffffffull; |
| 1243 | |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1244 | pci_set_dma_max_seg_size(dev, 65536); |
FUJITA Tomonori | 59fc67d | 2008-02-04 22:28:14 -0800 | [diff] [blame] | 1245 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | /* Fix up broken headers */ |
| 1248 | pci_fixup_device(pci_fixup_header, dev); |
| 1249 | |
Rafael J. Wysocki | 4b77b0a | 2009-09-09 23:49:59 +0200 | [diff] [blame] | 1250 | /* Clear the state_saved flag. */ |
| 1251 | dev->state_saved = false; |
| 1252 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1253 | /* Initialize various capabilities */ |
| 1254 | pci_init_capabilities(dev); |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 1255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | /* |
| 1257 | * Add the device to our list of discovered devices |
| 1258 | * and the bus list for fixup functions, etc. |
| 1259 | */ |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1260 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | list_add_tail(&dev->bus_list, &bus->devices); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1262 | up_write(&pci_bus_sem); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1263 | } |
| 1264 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 1265 | 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] | 1266 | { |
| 1267 | struct pci_dev *dev; |
| 1268 | |
Trent Piepho | 90bdb31 | 2009-03-20 14:56:00 -0600 | [diff] [blame] | 1269 | dev = pci_get_slot(bus, devfn); |
| 1270 | if (dev) { |
| 1271 | pci_dev_put(dev); |
| 1272 | return dev; |
| 1273 | } |
| 1274 | |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1275 | dev = pci_scan_device(bus, devfn); |
| 1276 | if (!dev) |
| 1277 | return NULL; |
| 1278 | |
| 1279 | pci_device_add(dev, bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | |
| 1281 | return dev; |
| 1282 | } |
Adrian Bunk | b73e968 | 2007-11-21 15:07:11 -0800 | [diff] [blame] | 1283 | EXPORT_SYMBOL(pci_scan_single_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1285 | static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn) |
| 1286 | { |
| 1287 | u16 cap; |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1288 | unsigned pos, next_fn; |
| 1289 | |
| 1290 | if (!dev) |
| 1291 | return 0; |
| 1292 | |
| 1293 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1294 | if (!pos) |
| 1295 | return 0; |
| 1296 | pci_read_config_word(dev, pos + 4, &cap); |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1297 | next_fn = cap >> 8; |
| 1298 | if (next_fn <= fn) |
| 1299 | return 0; |
| 1300 | return next_fn; |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1301 | } |
| 1302 | |
| 1303 | static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn) |
| 1304 | { |
| 1305 | return (fn + 1) % 8; |
| 1306 | } |
| 1307 | |
| 1308 | static unsigned no_next_fn(struct pci_dev *dev, unsigned fn) |
| 1309 | { |
| 1310 | return 0; |
| 1311 | } |
| 1312 | |
| 1313 | static int only_one_child(struct pci_bus *bus) |
| 1314 | { |
| 1315 | struct pci_dev *parent = bus->self; |
| 1316 | if (!parent || !pci_is_pcie(parent)) |
| 1317 | return 0; |
| 1318 | if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT || |
| 1319 | parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) |
| 1320 | return 1; |
| 1321 | return 0; |
| 1322 | } |
| 1323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | /** |
| 1325 | * pci_scan_slot - scan a PCI slot on a bus for devices. |
| 1326 | * @bus: PCI bus to scan |
| 1327 | * @devfn: slot number to scan (must have zero function.) |
| 1328 | * |
| 1329 | * Scan a PCI slot on the specified PCI bus for devices, adding |
| 1330 | * discovered devices to the @bus->devices list. New devices |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 1331 | * will not have is_added set. |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1332 | * |
| 1333 | * Returns the number of new devices found. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1335 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | { |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1337 | unsigned fn, nr = 0; |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1338 | struct pci_dev *dev; |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1339 | unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn; |
| 1340 | |
| 1341 | if (only_one_child(bus) && (devfn > 0)) |
| 1342 | return 0; /* Already scanned the entire slot */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1344 | dev = pci_scan_single_device(bus, devfn); |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1345 | if (!dev) |
| 1346 | return 0; |
| 1347 | if (!dev->is_added) |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1348 | nr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1350 | if (pci_ari_enabled(bus)) |
| 1351 | next_fn = next_ari_fn; |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1352 | else if (dev->multifunction) |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1353 | next_fn = next_trad_fn; |
| 1354 | |
| 1355 | for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) { |
| 1356 | dev = pci_scan_single_device(bus, devfn + fn); |
| 1357 | if (dev) { |
| 1358 | if (!dev->is_added) |
| 1359 | nr++; |
| 1360 | dev->multifunction = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | } |
| 1362 | } |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 1363 | |
Shaohua Li | 149e163 | 2008-07-23 10:32:31 +0800 | [diff] [blame] | 1364 | /* only one slot has pcie device */ |
| 1365 | if (bus->self && nr) |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 1366 | pcie_aspm_init_link_state(bus->self); |
| 1367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | return nr; |
| 1369 | } |
| 1370 | |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 1371 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | { |
| 1373 | unsigned int devfn, pass, max = bus->secondary; |
| 1374 | struct pci_dev *dev; |
| 1375 | |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1376 | dev_dbg(&bus->dev, "scanning bus\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | /* Go find them, Rover! */ |
| 1379 | for (devfn = 0; devfn < 0x100; devfn += 8) |
| 1380 | pci_scan_slot(bus, devfn); |
| 1381 | |
Yu Zhao | a28724b | 2009-03-20 11:25:13 +0800 | [diff] [blame] | 1382 | /* Reserve buses for SR-IOV capability. */ |
| 1383 | max += pci_iov_bus_range(bus); |
| 1384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | /* |
| 1386 | * After performing arch-dependent fixup of the bus, look behind |
| 1387 | * all PCI-to-PCI bridges on this bus. |
| 1388 | */ |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 1389 | if (!bus->is_added) { |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1390 | dev_dbg(&bus->dev, "fixups for bus\n"); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 1391 | pcibios_fixup_bus(bus); |
| 1392 | if (pci_is_root_bus(bus)) |
| 1393 | bus->is_added = 1; |
| 1394 | } |
| 1395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | for (pass=0; pass < 2; pass++) |
| 1397 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1398 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| 1399 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| 1400 | max = pci_scan_bridge(bus, dev, max, pass); |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * We've scanned the bus and so we know all about what's on |
| 1405 | * the other side of any bridges that may be on this bus plus |
| 1406 | * any devices. |
| 1407 | * |
| 1408 | * Return how far we've got finding sub-buses. |
| 1409 | */ |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1410 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | return max; |
| 1412 | } |
| 1413 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1414 | struct pci_bus * pci_create_bus(struct device *parent, |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1415 | int bus, struct pci_ops *ops, void *sysdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | { |
| 1417 | int error; |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1418 | struct pci_bus *b, *b2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | struct device *dev; |
| 1420 | |
| 1421 | b = pci_alloc_bus(); |
| 1422 | if (!b) |
| 1423 | return NULL; |
| 1424 | |
Geert Uytterhoeven | 6a3b3e2 | 2009-03-15 20:14:37 +0100 | [diff] [blame] | 1425 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | if (!dev){ |
| 1427 | kfree(b); |
| 1428 | return NULL; |
| 1429 | } |
| 1430 | |
| 1431 | b->sysdata = sysdata; |
| 1432 | b->ops = ops; |
| 1433 | |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1434 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
| 1435 | if (b2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | /* If we already got to this bus through a different bridge, ignore it */ |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1437 | dev_dbg(&b2->dev, "bus already known\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | goto err_out; |
| 1439 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1440 | |
| 1441 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | list_add_tail(&b->node, &pci_root_buses); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1443 | up_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | dev->parent = parent; |
| 1446 | dev->release = pci_release_bus_bridge_dev; |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 1447 | dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | error = device_register(dev); |
| 1449 | if (error) |
| 1450 | goto dev_reg_err; |
| 1451 | b->bridge = get_device(dev); |
Rafael J. Wysocki | a1e4d72 | 2010-02-08 19:16:33 +0100 | [diff] [blame] | 1452 | device_enable_async_suspend(b->bridge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1454 | if (!parent) |
| 1455 | set_dev_node(b->bridge, pcibus_to_node(b)); |
| 1456 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1457 | b->dev.class = &pcibus_class; |
| 1458 | b->dev.parent = b->bridge; |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 1459 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1460 | error = device_register(&b->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | if (error) |
| 1462 | goto class_dev_reg_err; |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1463 | error = device_create_file(&b->dev, &dev_attr_cpuaffinity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | if (error) |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1465 | goto dev_create_file_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
| 1467 | /* Create legacy_io and legacy_mem files for this bus */ |
| 1468 | pci_create_legacy_files(b); |
| 1469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | b->number = b->secondary = bus; |
| 1471 | b->resource[0] = &ioport_resource; |
| 1472 | b->resource[1] = &iomem_resource; |
| 1473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | return b; |
| 1475 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1476 | dev_create_file_err: |
| 1477 | device_unregister(&b->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | class_dev_reg_err: |
| 1479 | device_unregister(dev); |
| 1480 | dev_reg_err: |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1481 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | list_del(&b->node); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1483 | up_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | err_out: |
| 1485 | kfree(dev); |
| 1486 | kfree(b); |
| 1487 | return NULL; |
| 1488 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1489 | |
Sam Ravnborg | 0ab2b57 | 2008-02-17 10:45:28 +0100 | [diff] [blame] | 1490 | struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1491 | int bus, struct pci_ops *ops, void *sysdata) |
| 1492 | { |
| 1493 | struct pci_bus *b; |
| 1494 | |
| 1495 | b = pci_create_bus(parent, bus, ops, sysdata); |
| 1496 | if (b) |
| 1497 | b->subordinate = pci_scan_child_bus(b); |
| 1498 | return b; |
| 1499 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | EXPORT_SYMBOL(pci_scan_bus_parented); |
| 1501 | |
| 1502 | #ifdef CONFIG_HOTPLUG |
Alex Chiang | 3ed4fd9 | 2009-03-20 14:56:25 -0600 | [diff] [blame] | 1503 | /** |
| 1504 | * pci_rescan_bus - scan a PCI bus for devices. |
| 1505 | * @bus: PCI bus to scan |
| 1506 | * |
| 1507 | * Scan a PCI bus and child buses for new devices, adds them, |
| 1508 | * and enables them. |
| 1509 | * |
| 1510 | * Returns the max number of subordinate bus discovered. |
| 1511 | */ |
Alex Chiang | 5446a6b | 2009-04-01 18:24:12 -0600 | [diff] [blame] | 1512 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) |
Alex Chiang | 3ed4fd9 | 2009-03-20 14:56:25 -0600 | [diff] [blame] | 1513 | { |
| 1514 | unsigned int max; |
| 1515 | struct pci_dev *dev; |
| 1516 | |
| 1517 | max = pci_scan_child_bus(bus); |
| 1518 | |
Alex Chiang | 705b1aa | 2009-03-20 14:56:31 -0600 | [diff] [blame] | 1519 | down_read(&pci_bus_sem); |
Alex Chiang | 3ed4fd9 | 2009-03-20 14:56:25 -0600 | [diff] [blame] | 1520 | list_for_each_entry(dev, &bus->devices, bus_list) |
| 1521 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| 1522 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| 1523 | if (dev->subordinate) |
| 1524 | pci_bus_size_bridges(dev->subordinate); |
Alex Chiang | 705b1aa | 2009-03-20 14:56:31 -0600 | [diff] [blame] | 1525 | up_read(&pci_bus_sem); |
Alex Chiang | 3ed4fd9 | 2009-03-20 14:56:25 -0600 | [diff] [blame] | 1526 | |
| 1527 | pci_bus_assign_resources(bus); |
| 1528 | pci_enable_bridges(bus); |
| 1529 | pci_bus_add_devices(bus); |
| 1530 | |
| 1531 | return max; |
| 1532 | } |
| 1533 | EXPORT_SYMBOL_GPL(pci_rescan_bus); |
| 1534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | EXPORT_SYMBOL(pci_add_new_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | EXPORT_SYMBOL(pci_scan_slot); |
| 1537 | EXPORT_SYMBOL(pci_scan_bridge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
| 1539 | #endif |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1540 | |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1541 | static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1542 | { |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1543 | const struct pci_dev *a = to_pci_dev(d_a); |
| 1544 | const struct pci_dev *b = to_pci_dev(d_b); |
| 1545 | |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1546 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
| 1547 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; |
| 1548 | |
| 1549 | if (a->bus->number < b->bus->number) return -1; |
| 1550 | else if (a->bus->number > b->bus->number) return 1; |
| 1551 | |
| 1552 | if (a->devfn < b->devfn) return -1; |
| 1553 | else if (a->devfn > b->devfn) return 1; |
| 1554 | |
| 1555 | return 0; |
| 1556 | } |
| 1557 | |
Greg Kroah-Hartman | 5ff580c | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 1558 | void __init pci_sort_breadthfirst(void) |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1559 | { |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1560 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1561 | } |