1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2e05b3b4aSPaul Mackerras /* 3e05b3b4aSPaul Mackerras * Common pmac/prep/chrp pci routines. -- Cort 4e05b3b4aSPaul Mackerras */ 5e05b3b4aSPaul Mackerras 6e05b3b4aSPaul Mackerras #include <linux/kernel.h> 7e05b3b4aSPaul Mackerras #include <linux/pci.h> 8e05b3b4aSPaul Mackerras #include <linux/delay.h> 9e05b3b4aSPaul Mackerras #include <linux/string.h> 10e05b3b4aSPaul Mackerras #include <linux/init.h> 11e05b3b4aSPaul Mackerras #include <linux/capability.h> 12e05b3b4aSPaul Mackerras #include <linux/sched.h> 13e05b3b4aSPaul Mackerras #include <linux/errno.h> 1457c8a661SMike Rapoport #include <linux/memblock.h> 15c89ca593SMathieu Malaterre #include <linux/syscalls.h> 166e99e458SBenjamin Herrenschmidt #include <linux/irq.h> 17f90bb153SBenjamin Herrenschmidt #include <linux/list.h> 1866524b22SStephen Rothwell #include <linux/of.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 2093087948SPaul Gortmaker #include <linux/export.h> 21e05b3b4aSPaul Mackerras 22e05b3b4aSPaul Mackerras #include <asm/processor.h> 23e05b3b4aSPaul Mackerras #include <asm/io.h> 24e05b3b4aSPaul Mackerras #include <asm/sections.h> 25e05b3b4aSPaul Mackerras #include <asm/pci-bridge.h> 26c3bd517dSMilton Miller #include <asm/ppc-pci.h> 27e05b3b4aSPaul Mackerras #include <asm/byteorder.h> 287c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 29e05b3b4aSPaul Mackerras #include <asm/machdep.h> 30e05b3b4aSPaul Mackerras 31e05b3b4aSPaul Mackerras #undef DEBUG 32e05b3b4aSPaul Mackerras 33e05b3b4aSPaul Mackerras unsigned long isa_io_base = 0; 34e05b3b4aSPaul Mackerras unsigned long pci_dram_offset = 0; 35e05b3b4aSPaul Mackerras int pcibios_assign_bus_offset = 1; 369445aa1aSAl Viro EXPORT_SYMBOL(isa_io_base); 379445aa1aSAl Viro EXPORT_SYMBOL(pci_dram_offset); 38e05b3b4aSPaul Mackerras 39e05b3b4aSPaul Mackerras static void fixup_cpc710_pci64(struct pci_dev* dev); 40e05b3b4aSPaul Mackerras 41e05b3b4aSPaul Mackerras /* By default, we don't re-assign bus numbers. We do this only on 42e05b3b4aSPaul Mackerras * some pmacs 43e05b3b4aSPaul Mackerras */ 44fc3fb71cSBenjamin Herrenschmidt static int pci_assign_all_buses; 45e05b3b4aSPaul Mackerras 467b6b574cSBenjamin Herrenschmidt /* This will remain NULL for now, until isa-bridge.c is made common 477b6b574cSBenjamin Herrenschmidt * to both 32-bit and 64-bit. 487b6b574cSBenjamin Herrenschmidt */ 497b6b574cSBenjamin Herrenschmidt struct pci_dev *isa_bridge_pcidev; 507b6b574cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 517b6b574cSBenjamin Herrenschmidt 52e05b3b4aSPaul Mackerras static void 53e05b3b4aSPaul Mackerras fixup_cpc710_pci64(struct pci_dev* dev) 54e05b3b4aSPaul Mackerras { 55e05b3b4aSPaul Mackerras /* Hide the PCI64 BARs from the kernel as their content doesn't 56e05b3b4aSPaul Mackerras * fit well in the resource management 57e05b3b4aSPaul Mackerras */ 58e05b3b4aSPaul Mackerras dev->resource[0].start = dev->resource[0].end = 0; 59e05b3b4aSPaul Mackerras dev->resource[0].flags = 0; 60e05b3b4aSPaul Mackerras dev->resource[1].start = dev->resource[1].end = 0; 61e05b3b4aSPaul Mackerras dev->resource[1].flags = 0; 62e05b3b4aSPaul Mackerras } 63e05b3b4aSPaul Mackerras DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 64e05b3b4aSPaul Mackerras 657f102d61SPali Rohár #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) 667f102d61SPali Rohár 677f102d61SPali Rohár static u8* pci_to_OF_bus_map; 687f102d61SPali Rohár static int pci_bus_count; 697f102d61SPali Rohár 70e05b3b4aSPaul Mackerras /* 71e05b3b4aSPaul Mackerras * Functions below are used on OpenFirmware machines. 72e05b3b4aSPaul Mackerras */ 73e05b3b4aSPaul Mackerras static void 74e05b3b4aSPaul Mackerras make_one_node_map(struct device_node* node, u8 pci_bus) 75e05b3b4aSPaul Mackerras { 76a7f67bdfSJeremy Kerr const int *bus_range; 77e05b3b4aSPaul Mackerras int len; 78e05b3b4aSPaul Mackerras 79e05b3b4aSPaul Mackerras if (pci_bus >= pci_bus_count) 80e05b3b4aSPaul Mackerras return; 81e2eb6392SStephen Rothwell bus_range = of_get_property(node, "bus-range", &len); 82e05b3b4aSPaul Mackerras if (bus_range == NULL || len < 2 * sizeof(int)) { 83b7c670d6SRob Herring printk(KERN_WARNING "Can't get bus-range for %pOF, " 84b7c670d6SRob Herring "assuming it starts at 0\n", node); 85e05b3b4aSPaul Mackerras pci_to_OF_bus_map[pci_bus] = 0; 86e05b3b4aSPaul Mackerras } else 87e05b3b4aSPaul Mackerras pci_to_OF_bus_map[pci_bus] = bus_range[0]; 88e05b3b4aSPaul Mackerras 8966524b22SStephen Rothwell for_each_child_of_node(node, node) { 90e05b3b4aSPaul Mackerras struct pci_dev* dev; 91a7f67bdfSJeremy Kerr const unsigned int *class_code, *reg; 92e05b3b4aSPaul Mackerras 93e2eb6392SStephen Rothwell class_code = of_get_property(node, "class-code", NULL); 94e05b3b4aSPaul Mackerras if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 95e05b3b4aSPaul Mackerras (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 96e05b3b4aSPaul Mackerras continue; 97e2eb6392SStephen Rothwell reg = of_get_property(node, "reg", NULL); 98e05b3b4aSPaul Mackerras if (!reg) 99e05b3b4aSPaul Mackerras continue; 10050ed5780SSinan Kaya dev = pci_get_domain_bus_and_slot(0, pci_bus, 10150ed5780SSinan Kaya ((reg[0] >> 8) & 0xff)); 102ab462768SAlan Cox if (!dev || !dev->subordinate) { 103ab462768SAlan Cox pci_dev_put(dev); 104e05b3b4aSPaul Mackerras continue; 105ab462768SAlan Cox } 106e05b3b4aSPaul Mackerras make_one_node_map(node, dev->subordinate->number); 107ab462768SAlan Cox pci_dev_put(dev); 108e05b3b4aSPaul Mackerras } 109e05b3b4aSPaul Mackerras } 110e05b3b4aSPaul Mackerras 111407a7671SPali Rohár static void __init 112e05b3b4aSPaul Mackerras pcibios_make_OF_bus_map(void) 113e05b3b4aSPaul Mackerras { 114e05b3b4aSPaul Mackerras int i; 115a4c9e328SKumar Gala struct pci_controller *hose, *tmp; 116a7f67bdfSJeremy Kerr struct property *map_prop; 1178c8dc322SStephen Rothwell struct device_node *dn; 118e05b3b4aSPaul Mackerras 1195cbded58SRobert P. J. Day pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 120e05b3b4aSPaul Mackerras if (!pci_to_OF_bus_map) { 121e05b3b4aSPaul Mackerras printk(KERN_ERR "Can't allocate OF bus map !\n"); 122e05b3b4aSPaul Mackerras return; 123e05b3b4aSPaul Mackerras } 124e05b3b4aSPaul Mackerras 125e05b3b4aSPaul Mackerras /* We fill the bus map with invalid values, that helps 126e05b3b4aSPaul Mackerras * debugging. 127e05b3b4aSPaul Mackerras */ 128e05b3b4aSPaul Mackerras for (i=0; i<pci_bus_count; i++) 129e05b3b4aSPaul Mackerras pci_to_OF_bus_map[i] = 0xff; 130e05b3b4aSPaul Mackerras 131e05b3b4aSPaul Mackerras /* For each hose, we begin searching bridges */ 132a4c9e328SKumar Gala list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 13344ef3390SStephen Rothwell struct device_node* node = hose->dn; 13444ef3390SStephen Rothwell 135e05b3b4aSPaul Mackerras if (!node) 136e05b3b4aSPaul Mackerras continue; 137e05b3b4aSPaul Mackerras make_one_node_map(node, hose->first_busno); 138e05b3b4aSPaul Mackerras } 1398c8dc322SStephen Rothwell dn = of_find_node_by_path("/"); 1408c8dc322SStephen Rothwell map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 141a7f67bdfSJeremy Kerr if (map_prop) { 142a7f67bdfSJeremy Kerr BUG_ON(pci_bus_count > map_prop->length); 143a7f67bdfSJeremy Kerr memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 144a7f67bdfSJeremy Kerr } 1458c8dc322SStephen Rothwell of_node_put(dn); 146e05b3b4aSPaul Mackerras #ifdef DEBUG 147e05b3b4aSPaul Mackerras printk("PCI->OF bus map:\n"); 148e05b3b4aSPaul Mackerras for (i=0; i<pci_bus_count; i++) { 149e05b3b4aSPaul Mackerras if (pci_to_OF_bus_map[i] == 0xff) 150e05b3b4aSPaul Mackerras continue; 151e05b3b4aSPaul Mackerras printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 152e05b3b4aSPaul Mackerras } 153e05b3b4aSPaul Mackerras #endif 154e05b3b4aSPaul Mackerras } 155e05b3b4aSPaul Mackerras 156e05b3b4aSPaul Mackerras 157a2954a7eSPali Rohár #ifdef CONFIG_PPC_PMAC 158e05b3b4aSPaul Mackerras /* 159e05b3b4aSPaul Mackerras * Returns the PCI device matching a given OF node 160e05b3b4aSPaul Mackerras */ 16198d9f30cSBenjamin Herrenschmidt int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 162e05b3b4aSPaul Mackerras { 163e05b3b4aSPaul Mackerras struct pci_dev *dev = NULL; 16498d9f30cSBenjamin Herrenschmidt const __be32 *reg; 16598d9f30cSBenjamin Herrenschmidt int size; 166e05b3b4aSPaul Mackerras 16798d9f30cSBenjamin Herrenschmidt /* Check if it might have a chance to be a PCI device */ 16898d9f30cSBenjamin Herrenschmidt if (!pci_find_hose_for_OF_device(node)) 169e05b3b4aSPaul Mackerras return -ENODEV; 17098d9f30cSBenjamin Herrenschmidt 17198d9f30cSBenjamin Herrenschmidt reg = of_get_property(node, "reg", &size); 17298d9f30cSBenjamin Herrenschmidt if (!reg || size < 5 * sizeof(u32)) 173e05b3b4aSPaul Mackerras return -ENODEV; 17498d9f30cSBenjamin Herrenschmidt 17598d9f30cSBenjamin Herrenschmidt *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 17698d9f30cSBenjamin Herrenschmidt *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 177e05b3b4aSPaul Mackerras 178e05b3b4aSPaul Mackerras /* Ok, here we need some tweak. If we have already renumbered 179e05b3b4aSPaul Mackerras * all busses, we can't rely on the OF bus number any more. 180e05b3b4aSPaul Mackerras * the pci_to_OF_bus_map is not enough as several PCI busses 181e05b3b4aSPaul Mackerras * may match the same OF bus number. 182e05b3b4aSPaul Mackerras */ 183e05b3b4aSPaul Mackerras if (!pci_to_OF_bus_map) 184e05b3b4aSPaul Mackerras return 0; 185e05b3b4aSPaul Mackerras 186e05b3b4aSPaul Mackerras for_each_pci_dev(dev) 187e05b3b4aSPaul Mackerras if (pci_to_OF_bus_map[dev->bus->number] == *bus && 188e05b3b4aSPaul Mackerras dev->devfn == *devfn) { 189e05b3b4aSPaul Mackerras *bus = dev->bus->number; 190e05b3b4aSPaul Mackerras pci_dev_put(dev); 191e05b3b4aSPaul Mackerras return 0; 192e05b3b4aSPaul Mackerras } 193e05b3b4aSPaul Mackerras 194e05b3b4aSPaul Mackerras return -ENODEV; 195e05b3b4aSPaul Mackerras } 196e05b3b4aSPaul Mackerras EXPORT_SYMBOL(pci_device_from_OF_node); 197a2954a7eSPali Rohár #endif 198e05b3b4aSPaul Mackerras 19970454458SPali Rohár #ifdef CONFIG_PPC_CHRP 200e05b3b4aSPaul Mackerras /* We create the "pci-OF-bus-map" property now so it appears in the 201e05b3b4aSPaul Mackerras * /proc device tree 202e05b3b4aSPaul Mackerras */ 203e05b3b4aSPaul Mackerras void __init 204e05b3b4aSPaul Mackerras pci_create_OF_bus_map(void) 205e05b3b4aSPaul Mackerras { 206e05b3b4aSPaul Mackerras struct property* of_prop; 2078c8dc322SStephen Rothwell struct device_node *dn; 208e05b3b4aSPaul Mackerras 2097e1c4e27SMike Rapoport of_prop = memblock_alloc(sizeof(struct property) + 256, 2107e1c4e27SMike Rapoport SMP_CACHE_BYTES); 2118a7f97b9SMike Rapoport if (!of_prop) 2128a7f97b9SMike Rapoport panic("%s: Failed to allocate %zu bytes\n", __func__, 2138a7f97b9SMike Rapoport sizeof(struct property) + 256); 2148c8dc322SStephen Rothwell dn = of_find_node_by_path("/"); 2158c8dc322SStephen Rothwell if (dn) { 216e05b3b4aSPaul Mackerras memset(of_prop, -1, sizeof(struct property) + 256); 217e05b3b4aSPaul Mackerras of_prop->name = "pci-OF-bus-map"; 218e05b3b4aSPaul Mackerras of_prop->length = 256; 2191a38147eSStephen Rothwell of_prop->value = &of_prop[1]; 22079d1c712SNathan Fontenot of_add_property(dn, of_prop); 2218c8dc322SStephen Rothwell of_node_put(dn); 222e05b3b4aSPaul Mackerras } 223e05b3b4aSPaul Mackerras } 22470454458SPali Rohár #endif 225e05b3b4aSPaul Mackerras 2267f102d61SPali Rohár #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */ 2277f102d61SPali Rohár 228cad5cef6SGreg Kroah-Hartman void pcibios_setup_phb_io_space(struct pci_controller *hose) 22953280323SBenjamin Herrenschmidt { 23053280323SBenjamin Herrenschmidt unsigned long io_offset; 23153280323SBenjamin Herrenschmidt struct resource *res = &hose->io_resource; 23253280323SBenjamin Herrenschmidt 23353280323SBenjamin Herrenschmidt /* Fixup IO space offset */ 23438973ba7SBjorn Helgaas io_offset = pcibios_io_space_offset(hose); 23538973ba7SBjorn Helgaas res->start += io_offset; 23638973ba7SBjorn Helgaas res->end += io_offset; 23753280323SBenjamin Herrenschmidt } 23853280323SBenjamin Herrenschmidt 2393fd94c6bSBenjamin Herrenschmidt static int __init pcibios_init(void) 240e05b3b4aSPaul Mackerras { 241a4c9e328SKumar Gala struct pci_controller *hose, *tmp; 24256635681SPali Rohár #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 243a4c9e328SKumar Gala int next_busno = 0; 24456635681SPali Rohár #endif 245e05b3b4aSPaul Mackerras 246e05b3b4aSPaul Mackerras printk(KERN_INFO "PCI: Probing PCI hardware\n"); 247e05b3b4aSPaul Mackerras 248*0382a35bSPali Rohár #ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 249*0382a35bSPali Rohár /* 250*0382a35bSPali Rohár * Enable PCI domains in /proc when PCI bus numbers are not unique 251*0382a35bSPali Rohár * across all PCI domains to prevent conflicts. And keep PCI domain 0 252*0382a35bSPali Rohár * backward compatible in /proc for video cards. 253*0382a35bSPali Rohár */ 254*0382a35bSPali Rohár pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); 255*0382a35bSPali Rohár #endif 256*0382a35bSPali Rohár 2570e47ff1cSRob Herring if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 258fc3fb71cSBenjamin Herrenschmidt pci_assign_all_buses = 1; 259fc3fb71cSBenjamin Herrenschmidt 260e05b3b4aSPaul Mackerras /* Scan all of the recorded PCI controllers. */ 261a4c9e328SKumar Gala list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 26256635681SPali Rohár #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 263e05b3b4aSPaul Mackerras if (pci_assign_all_buses) 264e05b3b4aSPaul Mackerras hose->first_busno = next_busno; 26556635681SPali Rohár #endif 266e05b3b4aSPaul Mackerras hose->last_busno = 0xff; 267b5d937deSGrant Likely pcibios_scan_phb(hose); 26853280323SBenjamin Herrenschmidt pci_bus_add_devices(hose->bus); 26956635681SPali Rohár #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 270e05b3b4aSPaul Mackerras if (pci_assign_all_buses || next_busno <= hose->last_busno) 271e05b3b4aSPaul Mackerras next_busno = hose->last_busno + pcibios_assign_bus_offset; 27256635681SPali Rohár #endif 273e05b3b4aSPaul Mackerras } 2747f102d61SPali Rohár 2757f102d61SPali Rohár #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) 276e05b3b4aSPaul Mackerras pci_bus_count = next_busno; 277e05b3b4aSPaul Mackerras 278e05b3b4aSPaul Mackerras /* OpenFirmware based machines need a map of OF bus 279e05b3b4aSPaul Mackerras * numbers vs. kernel bus numbers since we may have to 280e05b3b4aSPaul Mackerras * remap them. 281e05b3b4aSPaul Mackerras */ 2826b82b3e4SAnton Vorontsov if (pci_assign_all_buses) 283e05b3b4aSPaul Mackerras pcibios_make_OF_bus_map(); 2847f102d61SPali Rohár #endif 285e05b3b4aSPaul Mackerras 2863fd94c6bSBenjamin Herrenschmidt /* Call common code to handle resource allocation */ 2873fd94c6bSBenjamin Herrenschmidt pcibios_resource_survey(); 288e05b3b4aSPaul Mackerras 2893f068aaeSSam Bobroff /* Call machine dependent fixup */ 2903f068aaeSSam Bobroff if (ppc_md.pcibios_fixup) 2913f068aaeSSam Bobroff ppc_md.pcibios_fixup(); 2923f068aaeSSam Bobroff 293e05b3b4aSPaul Mackerras /* Call machine dependent post-init code */ 294e05b3b4aSPaul Mackerras if (ppc_md.pcibios_after_init) 295e05b3b4aSPaul Mackerras ppc_md.pcibios_after_init(); 296e05b3b4aSPaul Mackerras 297e05b3b4aSPaul Mackerras return 0; 298e05b3b4aSPaul Mackerras } 299e05b3b4aSPaul Mackerras 300e05b3b4aSPaul Mackerras subsys_initcall(pcibios_init); 301e05b3b4aSPaul Mackerras 3020b1d40c4SKumar Gala static struct pci_controller* 303e05b3b4aSPaul Mackerras pci_bus_to_hose(int bus) 304e05b3b4aSPaul Mackerras { 305a4c9e328SKumar Gala struct pci_controller *hose, *tmp; 306e05b3b4aSPaul Mackerras 307a4c9e328SKumar Gala list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 308e05b3b4aSPaul Mackerras if (bus >= hose->first_busno && bus <= hose->last_busno) 309e05b3b4aSPaul Mackerras return hose; 310e05b3b4aSPaul Mackerras return NULL; 311e05b3b4aSPaul Mackerras } 312e05b3b4aSPaul Mackerras 313e05b3b4aSPaul Mackerras /* Provide information on locations of various I/O regions in physical 314e05b3b4aSPaul Mackerras * memory. Do this on a per-card basis so that we choose the right 315e05b3b4aSPaul Mackerras * root bridge. 316e05b3b4aSPaul Mackerras * Note that the returned IO or memory base is a physical address 317e05b3b4aSPaul Mackerras */ 318e05b3b4aSPaul Mackerras 3193691d614SAl Viro SYSCALL_DEFINE3(pciconfig_iobase, long, which, 3203691d614SAl Viro unsigned long, bus, unsigned long, devfn) 321e05b3b4aSPaul Mackerras { 322e05b3b4aSPaul Mackerras struct pci_controller* hose; 323e05b3b4aSPaul Mackerras long result = -EOPNOTSUPP; 324e05b3b4aSPaul Mackerras 325e05b3b4aSPaul Mackerras hose = pci_bus_to_hose(bus); 326e05b3b4aSPaul Mackerras if (!hose) 327e05b3b4aSPaul Mackerras return -ENODEV; 328e05b3b4aSPaul Mackerras 329e05b3b4aSPaul Mackerras switch (which) { 330e05b3b4aSPaul Mackerras case IOBASE_BRIDGE_NUMBER: 331e05b3b4aSPaul Mackerras return (long)hose->first_busno; 332e05b3b4aSPaul Mackerras case IOBASE_MEMORY: 3333fd47f06SBenjamin Herrenschmidt return (long)hose->mem_offset[0]; 334e05b3b4aSPaul Mackerras case IOBASE_IO: 335e05b3b4aSPaul Mackerras return (long)hose->io_base_phys; 336e05b3b4aSPaul Mackerras case IOBASE_ISA_IO: 337e05b3b4aSPaul Mackerras return (long)isa_io_base; 338e05b3b4aSPaul Mackerras case IOBASE_ISA_MEM: 339e05b3b4aSPaul Mackerras return (long)isa_mem_base; 340e05b3b4aSPaul Mackerras } 341e05b3b4aSPaul Mackerras 342e05b3b4aSPaul Mackerras return result; 343e05b3b4aSPaul Mackerras } 344