1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Port for PPC64 David Engebretsen, IBM Corp. 4 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. 5 * 6 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM 7 * Rework, based on alpha PCI code. 8 */ 9 10 #undef DEBUG 11 12 #include <linux/kernel.h> 13 #include <linux/pci.h> 14 #include <linux/string.h> 15 #include <linux/init.h> 16 #include <linux/export.h> 17 #include <linux/mm.h> 18 #include <linux/list.h> 19 #include <linux/syscalls.h> 20 #include <linux/irq.h> 21 #include <linux/vmalloc.h> 22 23 #include <asm/processor.h> 24 #include <asm/io.h> 25 #include <asm/prom.h> 26 #include <asm/pci-bridge.h> 27 #include <asm/byteorder.h> 28 #include <asm/machdep.h> 29 #include <asm/ppc-pci.h> 30 31 /* pci_io_base -- the base address from which io bars are offsets. 32 * This is the lowest I/O base address (so bar values are always positive), 33 * and it *must* be the start of ISA space if an ISA bus exists because 34 * ISA drivers use hard coded offsets. If no ISA bus exists nothing 35 * is mapped on the first 64K of IO space 36 */ 37 unsigned long pci_io_base; 38 EXPORT_SYMBOL(pci_io_base); 39 40 static int __init pcibios_init(void) 41 { 42 struct pci_controller *hose, *tmp; 43 44 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 45 46 /* For now, override phys_mem_access_prot. If we need it,g 47 * later, we may move that initialization to each ppc_md 48 */ 49 ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot; 50 51 /* On ppc64, we always enable PCI domains and we keep domain 0 52 * backward compatible in /proc for video cards 53 */ 54 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); 55 56 /* Scan all of the recorded PCI controllers. */ 57 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 58 pcibios_scan_phb(hose); 59 60 /* Call common code to handle resource allocation */ 61 pcibios_resource_survey(); 62 63 /* Add devices. */ 64 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 65 pci_bus_add_devices(hose->bus); 66 67 /* Call machine dependent fixup */ 68 if (ppc_md.pcibios_fixup) 69 ppc_md.pcibios_fixup(); 70 71 printk(KERN_DEBUG "PCI: Probing PCI hardware done\n"); 72 73 return 0; 74 } 75 76 subsys_initcall(pcibios_init); 77 78 int pcibios_unmap_io_space(struct pci_bus *bus) 79 { 80 struct pci_controller *hose; 81 82 WARN_ON(bus == NULL); 83 84 /* If this is not a PHB, we only flush the hash table over 85 * the area mapped by this bridge. We don't play with the PTE 86 * mappings since we might have to deal with sub-page alignments 87 * so flushing the hash table is the only sane way to make sure 88 * that no hash entries are covering that removed bridge area 89 * while still allowing other busses overlapping those pages 90 * 91 * Note: If we ever support P2P hotplug on Book3E, we'll have 92 * to do an appropriate TLB flush here too 93 */ 94 if (bus->self) { 95 #ifdef CONFIG_PPC_BOOK3S_64 96 struct resource *res = bus->resource[0]; 97 #endif 98 99 pr_debug("IO unmapping for PCI-PCI bridge %s\n", 100 pci_name(bus->self)); 101 102 #ifdef CONFIG_PPC_BOOK3S_64 103 __flush_hash_table_range(res->start + _IO_BASE, 104 res->end + _IO_BASE + 1); 105 #endif 106 return 0; 107 } 108 109 /* Get the host bridge */ 110 hose = pci_bus_to_host(bus); 111 112 pr_debug("IO unmapping for PHB %pOF\n", hose->dn); 113 pr_debug(" alloc=0x%p\n", hose->io_base_alloc); 114 115 iounmap(hose->io_base_alloc); 116 return 0; 117 } 118 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space); 119 120 void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size) 121 { 122 struct vm_struct *area; 123 unsigned long addr; 124 125 WARN_ON_ONCE(paddr & ~PAGE_MASK); 126 WARN_ON_ONCE(size & ~PAGE_MASK); 127 128 /* 129 * Let's allocate some IO space for that guy. We don't pass VM_IOREMAP 130 * because we don't care about alignment tricks that the core does in 131 * that case. Maybe we should due to stupid card with incomplete 132 * address decoding but I'd rather not deal with those outside of the 133 * reserved 64K legacy region. 134 */ 135 area = __get_vm_area_caller(size, 0, PHB_IO_BASE, PHB_IO_END, 136 __builtin_return_address(0)); 137 if (!area) 138 return NULL; 139 140 addr = (unsigned long)area->addr; 141 if (ioremap_page_range(addr, addr + size, paddr, 142 pgprot_noncached(PAGE_KERNEL))) { 143 vunmap_range(addr, addr + size); 144 return NULL; 145 } 146 147 return (void __iomem *)addr; 148 } 149 EXPORT_SYMBOL_GPL(ioremap_phb); 150 151 static int pcibios_map_phb_io_space(struct pci_controller *hose) 152 { 153 unsigned long phys_page; 154 unsigned long size_page; 155 unsigned long io_virt_offset; 156 157 phys_page = ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE); 158 size_page = ALIGN(hose->pci_io_size, PAGE_SIZE); 159 160 /* Make sure IO area address is clear */ 161 hose->io_base_alloc = NULL; 162 163 /* If there's no IO to map on that bus, get away too */ 164 if (hose->pci_io_size == 0 || hose->io_base_phys == 0) 165 return 0; 166 167 /* Let's allocate some IO space for that guy. We don't pass 168 * VM_IOREMAP because we don't care about alignment tricks that 169 * the core does in that case. Maybe we should due to stupid card 170 * with incomplete address decoding but I'd rather not deal with 171 * those outside of the reserved 64K legacy region. 172 */ 173 hose->io_base_alloc = ioremap_phb(phys_page, size_page); 174 if (!hose->io_base_alloc) 175 return -ENOMEM; 176 hose->io_base_virt = hose->io_base_alloc + 177 hose->io_base_phys - phys_page; 178 179 pr_debug("IO mapping for PHB %pOF\n", hose->dn); 180 pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n", 181 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc); 182 pr_debug(" size=0x%016llx (alloc=0x%016lx)\n", 183 hose->pci_io_size, size_page); 184 185 /* Fixup hose IO resource */ 186 io_virt_offset = pcibios_io_space_offset(hose); 187 hose->io_resource.start += io_virt_offset; 188 hose->io_resource.end += io_virt_offset; 189 190 pr_debug(" hose->io_resource=%pR\n", &hose->io_resource); 191 192 return 0; 193 } 194 195 int pcibios_map_io_space(struct pci_bus *bus) 196 { 197 WARN_ON(bus == NULL); 198 199 /* If this not a PHB, nothing to do, page tables still exist and 200 * thus HPTEs will be faulted in when needed 201 */ 202 if (bus->self) { 203 pr_debug("IO mapping for PCI-PCI bridge %s\n", 204 pci_name(bus->self)); 205 pr_debug(" virt=0x%016llx...0x%016llx\n", 206 bus->resource[0]->start + _IO_BASE, 207 bus->resource[0]->end + _IO_BASE); 208 return 0; 209 } 210 211 return pcibios_map_phb_io_space(pci_bus_to_host(bus)); 212 } 213 EXPORT_SYMBOL_GPL(pcibios_map_io_space); 214 215 void pcibios_setup_phb_io_space(struct pci_controller *hose) 216 { 217 pcibios_map_phb_io_space(hose); 218 } 219 220 #define IOBASE_BRIDGE_NUMBER 0 221 #define IOBASE_MEMORY 1 222 #define IOBASE_IO 2 223 #define IOBASE_ISA_IO 3 224 #define IOBASE_ISA_MEM 4 225 226 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus, 227 unsigned long, in_devfn) 228 { 229 struct pci_controller* hose; 230 struct pci_bus *tmp_bus, *bus = NULL; 231 struct device_node *hose_node; 232 233 /* Argh ! Please forgive me for that hack, but that's the 234 * simplest way to get existing XFree to not lockup on some 235 * G5 machines... So when something asks for bus 0 io base 236 * (bus 0 is HT root), we return the AGP one instead. 237 */ 238 if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) { 239 struct device_node *agp; 240 241 agp = of_find_compatible_node(NULL, NULL, "u3-agp"); 242 if (agp) 243 in_bus = 0xf0; 244 of_node_put(agp); 245 } 246 247 /* That syscall isn't quite compatible with PCI domains, but it's 248 * used on pre-domains setup. We return the first match 249 */ 250 251 list_for_each_entry(tmp_bus, &pci_root_buses, node) { 252 if (in_bus >= tmp_bus->number && 253 in_bus <= tmp_bus->busn_res.end) { 254 bus = tmp_bus; 255 break; 256 } 257 } 258 if (bus == NULL || bus->dev.of_node == NULL) 259 return -ENODEV; 260 261 hose_node = bus->dev.of_node; 262 hose = PCI_DN(hose_node)->phb; 263 264 switch (which) { 265 case IOBASE_BRIDGE_NUMBER: 266 return (long)hose->first_busno; 267 case IOBASE_MEMORY: 268 return (long)hose->mem_offset[0]; 269 case IOBASE_IO: 270 return (long)hose->io_base_phys; 271 case IOBASE_ISA_IO: 272 return (long)isa_io_base; 273 case IOBASE_ISA_MEM: 274 return -EINVAL; 275 } 276 277 return -EOPNOTSUPP; 278 } 279 280 #ifdef CONFIG_NUMA 281 int pcibus_to_node(struct pci_bus *bus) 282 { 283 struct pci_controller *phb = pci_bus_to_host(bus); 284 return phb->node; 285 } 286 EXPORT_SYMBOL(pcibus_to_node); 287 #endif 288