1 /* 2 * New-style PCI core. 3 * 4 * Copyright (c) 2004 - 2009 Paul Mundt 5 * Copyright (c) 2002 M. R. Brown 6 * 7 * Modelled after arch/mips/pci/pci.c: 8 * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org) 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file "COPYING" in the main directory of this archive 12 * for more details. 13 */ 14 #include <linux/kernel.h> 15 #include <linux/mm.h> 16 #include <linux/pci.h> 17 #include <linux/init.h> 18 #include <linux/types.h> 19 #include <linux/dma-debug.h> 20 #include <linux/io.h> 21 #include <linux/mutex.h> 22 #include <linux/spinlock.h> 23 #include <linux/export.h> 24 25 unsigned long PCIBIOS_MIN_IO = 0x0000; 26 unsigned long PCIBIOS_MIN_MEM = 0; 27 28 /* 29 * The PCI controller list. 30 */ 31 static struct pci_channel *hose_head, **hose_tail = &hose_head; 32 33 static int pci_initialized; 34 35 static void pcibios_scanbus(struct pci_channel *hose) 36 { 37 static int next_busno; 38 static int need_domain_info; 39 LIST_HEAD(resources); 40 struct resource *res; 41 resource_size_t offset; 42 int i; 43 struct pci_bus *bus; 44 45 for (i = 0; i < hose->nr_resources; i++) { 46 res = hose->resources + i; 47 offset = 0; 48 if (res->flags & IORESOURCE_IO) 49 offset = hose->io_offset; 50 else if (res->flags & IORESOURCE_MEM) 51 offset = hose->mem_offset; 52 pci_add_resource_offset(&resources, res, offset); 53 } 54 55 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose, 56 &resources); 57 hose->bus = bus; 58 59 need_domain_info = need_domain_info || hose->index; 60 hose->need_domain_info = need_domain_info; 61 if (bus) { 62 next_busno = bus->busn_res.end + 1; 63 /* Don't allow 8-bit bus number overflow inside the hose - 64 reserve some space for bridges. */ 65 if (next_busno > 224) { 66 next_busno = 0; 67 need_domain_info = 1; 68 } 69 70 pci_bus_size_bridges(bus); 71 pci_bus_assign_resources(bus); 72 } else { 73 pci_free_resource_list(&resources); 74 } 75 } 76 77 /* 78 * This interrupt-safe spinlock protects all accesses to PCI 79 * configuration space. 80 */ 81 DEFINE_RAW_SPINLOCK(pci_config_lock); 82 static DEFINE_MUTEX(pci_scan_mutex); 83 84 int register_pci_controller(struct pci_channel *hose) 85 { 86 int i; 87 88 for (i = 0; i < hose->nr_resources; i++) { 89 struct resource *res = hose->resources + i; 90 91 if (res->flags & IORESOURCE_IO) { 92 if (request_resource(&ioport_resource, res) < 0) 93 goto out; 94 } else { 95 if (request_resource(&iomem_resource, res) < 0) 96 goto out; 97 } 98 } 99 100 *hose_tail = hose; 101 hose_tail = &hose->next; 102 103 /* 104 * Do not panic here but later - this might happen before console init. 105 */ 106 if (!hose->io_map_base) { 107 printk(KERN_WARNING 108 "registering PCI controller with io_map_base unset\n"); 109 } 110 111 /* 112 * Setup the ERR/PERR and SERR timers, if available. 113 */ 114 pcibios_enable_timers(hose); 115 116 /* 117 * Scan the bus if it is register after the PCI subsystem 118 * initialization. 119 */ 120 if (pci_initialized) { 121 mutex_lock(&pci_scan_mutex); 122 pcibios_scanbus(hose); 123 mutex_unlock(&pci_scan_mutex); 124 } 125 126 return 0; 127 128 out: 129 for (--i; i >= 0; i--) 130 release_resource(&hose->resources[i]); 131 132 printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n"); 133 return -1; 134 } 135 136 static int __init pcibios_init(void) 137 { 138 struct pci_channel *hose; 139 140 /* Scan all of the recorded PCI controllers. */ 141 for (hose = hose_head; hose; hose = hose->next) 142 pcibios_scanbus(hose); 143 144 pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq); 145 146 dma_debug_add_bus(&pci_bus_type); 147 148 pci_initialized = 1; 149 150 return 0; 151 } 152 subsys_initcall(pcibios_init); 153 154 /* 155 * Called after each bus is probed, but before its children 156 * are examined. 157 */ 158 void pcibios_fixup_bus(struct pci_bus *bus) 159 { 160 } 161 162 /* 163 * We need to avoid collisions with `mirrored' VGA ports 164 * and other strange ISA hardware, so we always want the 165 * addresses to be allocated in the 0x000-0x0ff region 166 * modulo 0x400. 167 */ 168 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 169 resource_size_t size, resource_size_t align) 170 { 171 struct pci_dev *dev = data; 172 struct pci_channel *hose = dev->sysdata; 173 resource_size_t start = res->start; 174 175 if (res->flags & IORESOURCE_IO) { 176 if (start < PCIBIOS_MIN_IO + hose->resources[0].start) 177 start = PCIBIOS_MIN_IO + hose->resources[0].start; 178 179 /* 180 * Put everything into 0x00-0xff region modulo 0x400. 181 */ 182 if (start & 0x300) 183 start = (start + 0x3ff) & ~0x3ff; 184 } 185 186 return start; 187 } 188 189 int pcibios_enable_device(struct pci_dev *dev, int mask) 190 { 191 return pci_enable_resources(dev, mask); 192 } 193 194 static void __init 195 pcibios_bus_report_status_early(struct pci_channel *hose, 196 int top_bus, int current_bus, 197 unsigned int status_mask, int warn) 198 { 199 unsigned int pci_devfn; 200 u16 status; 201 int ret; 202 203 for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) { 204 if (PCI_FUNC(pci_devfn)) 205 continue; 206 ret = early_read_config_word(hose, top_bus, current_bus, 207 pci_devfn, PCI_STATUS, &status); 208 if (ret != PCIBIOS_SUCCESSFUL) 209 continue; 210 if (status == 0xffff) 211 continue; 212 213 early_write_config_word(hose, top_bus, current_bus, 214 pci_devfn, PCI_STATUS, 215 status & status_mask); 216 if (warn) 217 printk("(%02x:%02x: %04X) ", current_bus, 218 pci_devfn, status); 219 } 220 } 221 222 /* 223 * We can't use pci_find_device() here since we are 224 * called from interrupt context. 225 */ 226 static void __init_refok 227 pcibios_bus_report_status(struct pci_bus *bus, unsigned int status_mask, 228 int warn) 229 { 230 struct pci_dev *dev; 231 232 list_for_each_entry(dev, &bus->devices, bus_list) { 233 u16 status; 234 235 /* 236 * ignore host bridge - we handle 237 * that separately 238 */ 239 if (dev->bus->number == 0 && dev->devfn == 0) 240 continue; 241 242 pci_read_config_word(dev, PCI_STATUS, &status); 243 if (status == 0xffff) 244 continue; 245 246 if ((status & status_mask) == 0) 247 continue; 248 249 /* clear the status errors */ 250 pci_write_config_word(dev, PCI_STATUS, status & status_mask); 251 252 if (warn) 253 printk("(%s: %04X) ", pci_name(dev), status); 254 } 255 256 list_for_each_entry(dev, &bus->devices, bus_list) 257 if (dev->subordinate) 258 pcibios_bus_report_status(dev->subordinate, status_mask, warn); 259 } 260 261 void __init_refok pcibios_report_status(unsigned int status_mask, int warn) 262 { 263 struct pci_channel *hose; 264 265 for (hose = hose_head; hose; hose = hose->next) { 266 if (unlikely(!hose->bus)) 267 pcibios_bus_report_status_early(hose, hose_head->index, 268 hose->index, status_mask, warn); 269 else 270 pcibios_bus_report_status(hose->bus, status_mask, warn); 271 } 272 } 273 274 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, 275 enum pci_mmap_state mmap_state, int write_combine) 276 { 277 /* 278 * I/O space can be accessed via normal processor loads and stores on 279 * this platform but for now we elect not to do this and portable 280 * drivers should not do this anyway. 281 */ 282 if (mmap_state == pci_mmap_io) 283 return -EINVAL; 284 285 /* 286 * Ignore write-combine; for now only return uncached mappings. 287 */ 288 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 289 290 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 291 vma->vm_end - vma->vm_start, 292 vma->vm_page_prot); 293 } 294 295 #ifndef CONFIG_GENERIC_IOMAP 296 297 void __iomem *__pci_ioport_map(struct pci_dev *dev, 298 unsigned long port, unsigned int nr) 299 { 300 struct pci_channel *chan = dev->sysdata; 301 302 if (unlikely(!chan->io_map_base)) { 303 chan->io_map_base = sh_io_port_base; 304 305 if (pci_domains_supported) 306 panic("To avoid data corruption io_map_base MUST be " 307 "set with multiple PCI domains."); 308 } 309 310 return (void __iomem *)(chan->io_map_base + port); 311 } 312 313 void pci_iounmap(struct pci_dev *dev, void __iomem *addr) 314 { 315 iounmap(addr); 316 } 317 EXPORT_SYMBOL(pci_iounmap); 318 319 #endif /* CONFIG_GENERIC_IOMAP */ 320 321 EXPORT_SYMBOL(PCIBIOS_MIN_IO); 322 EXPORT_SYMBOL(PCIBIOS_MIN_MEM); 323