// SPDX-License-Identifier: GPL-2.0-only /* * Common pmac/prep/chrp pci routines. -- Cort */ #include <linux/kernel.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/string.h> #include <linux/init.h> #include <linux/capability.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/memblock.h> #include <linux/syscalls.h> #include <linux/irq.h> #include <linux/list.h> #include <linux/of.h> #include <linux/slab.h> #include <linux/export.h> #include <asm/processor.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/sections.h> #include <asm/pci-bridge.h> #include <asm/ppc-pci.h> #include <asm/byteorder.h> #include <linux/uaccess.h> #include <asm/machdep.h> #undef DEBUG unsigned long isa_io_base = 0; unsigned long pci_dram_offset = 0; int pcibios_assign_bus_offset = 1; EXPORT_SYMBOL(isa_io_base); EXPORT_SYMBOL(pci_dram_offset); void pcibios_make_OF_bus_map(void); static void fixup_cpc710_pci64(struct pci_dev* dev); static u8* pci_to_OF_bus_map; /* By default, we don't re-assign bus numbers. We do this only on * some pmacs */ static int pci_assign_all_buses; static int pci_bus_count; /* This will remain NULL for now, until isa-bridge.c is made common * to both 32-bit and 64-bit. */ struct pci_dev *isa_bridge_pcidev; EXPORT_SYMBOL_GPL(isa_bridge_pcidev); static void fixup_cpc710_pci64(struct pci_dev* dev) { /* Hide the PCI64 BARs from the kernel as their content doesn't * fit well in the resource management */ dev->resource[0].start = dev->resource[0].end = 0; dev->resource[0].flags = 0; dev->resource[1].start = dev->resource[1].end = 0; dev->resource[1].flags = 0; } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); /* * Functions below are used on OpenFirmware machines. */ static void make_one_node_map(struct device_node* node, u8 pci_bus) { const int *bus_range; int len; if (pci_bus >= pci_bus_count) return; bus_range = of_get_property(node, "bus-range", &len); if (bus_range == NULL || len < 2 * sizeof(int)) { printk(KERN_WARNING "Can't get bus-range for %pOF, " "assuming it starts at 0\n", node); pci_to_OF_bus_map[pci_bus] = 0; } else pci_to_OF_bus_map[pci_bus] = bus_range[0]; for_each_child_of_node(node, node) { struct pci_dev* dev; const unsigned int *class_code, *reg; class_code = of_get_property(node, "class-code", NULL); if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) continue; reg = of_get_property(node, "reg", NULL); if (!reg) continue; dev = pci_get_domain_bus_and_slot(0, pci_bus, ((reg[0] >> 8) & 0xff)); if (!dev || !dev->subordinate) { pci_dev_put(dev); continue; } make_one_node_map(node, dev->subordinate->number); pci_dev_put(dev); } } void pcibios_make_OF_bus_map(void) { int i; struct pci_controller *hose, *tmp; struct property *map_prop; struct device_node *dn; pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); if (!pci_to_OF_bus_map) { printk(KERN_ERR "Can't allocate OF bus map !\n"); return; } /* We fill the bus map with invalid values, that helps * debugging. */ for (i=0; i<pci_bus_count; i++) pci_to_OF_bus_map[i] = 0xff; /* For each hose, we begin searching bridges */ list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { struct device_node* node = hose->dn; if (!node) continue; make_one_node_map(node, hose->first_busno); } dn = of_find_node_by_path("/"); map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); if (map_prop) { BUG_ON(pci_bus_count > map_prop->length); memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); } of_node_put(dn); #ifdef DEBUG printk("PCI->OF bus map:\n"); for (i=0; i<pci_bus_count; i++) { if (pci_to_OF_bus_map[i] == 0xff) continue; printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); } #endif } /* * Returns the PCI device matching a given OF node */ int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) { struct pci_dev *dev = NULL; const __be32 *reg; int size; /* Check if it might have a chance to be a PCI device */ if (!pci_find_hose_for_OF_device(node)) return -ENODEV; reg = of_get_property(node, "reg", &size); if (!reg || size < 5 * sizeof(u32)) return -ENODEV; *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; /* Ok, here we need some tweak. If we have already renumbered * all busses, we can't rely on the OF bus number any more. * the pci_to_OF_bus_map is not enough as several PCI busses * may match the same OF bus number. */ if (!pci_to_OF_bus_map) return 0; for_each_pci_dev(dev) if (pci_to_OF_bus_map[dev->bus->number] == *bus && dev->devfn == *devfn) { *bus = dev->bus->number; pci_dev_put(dev); return 0; } return -ENODEV; } EXPORT_SYMBOL(pci_device_from_OF_node); /* We create the "pci-OF-bus-map" property now so it appears in the * /proc device tree */ void __init pci_create_OF_bus_map(void) { struct property* of_prop; struct device_node *dn; of_prop = memblock_alloc(sizeof(struct property) + 256, SMP_CACHE_BYTES); if (!of_prop) panic("%s: Failed to allocate %zu bytes\n", __func__, sizeof(struct property) + 256); dn = of_find_node_by_path("/"); if (dn) { memset(of_prop, -1, sizeof(struct property) + 256); of_prop->name = "pci-OF-bus-map"; of_prop->length = 256; of_prop->value = &of_prop[1]; of_add_property(dn, of_prop); of_node_put(dn); } } void pcibios_setup_phb_io_space(struct pci_controller *hose) { unsigned long io_offset; struct resource *res = &hose->io_resource; /* Fixup IO space offset */ io_offset = pcibios_io_space_offset(hose); res->start += io_offset; res->end += io_offset; } static int __init pcibios_init(void) { struct pci_controller *hose, *tmp; int next_busno = 0; printk(KERN_INFO "PCI: Probing PCI hardware\n"); if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) pci_assign_all_buses = 1; /* Scan all of the recorded PCI controllers. */ list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { if (pci_assign_all_buses) hose->first_busno = next_busno; hose->last_busno = 0xff; pcibios_scan_phb(hose); pci_bus_add_devices(hose->bus); if (pci_assign_all_buses || next_busno <= hose->last_busno) next_busno = hose->last_busno + pcibios_assign_bus_offset; } pci_bus_count = next_busno; /* OpenFirmware based machines need a map of OF bus * numbers vs. kernel bus numbers since we may have to * remap them. */ if (pci_assign_all_buses) pcibios_make_OF_bus_map(); /* Call common code to handle resource allocation */ pcibios_resource_survey(); /* Call machine dependent post-init code */ if (ppc_md.pcibios_after_init) ppc_md.pcibios_after_init(); return 0; } subsys_initcall(pcibios_init); static struct pci_controller* pci_bus_to_hose(int bus) { struct pci_controller *hose, *tmp; list_for_each_entry_safe(hose, tmp, &hose_list, list_node) if (bus >= hose->first_busno && bus <= hose->last_busno) return hose; return NULL; } /* Provide information on locations of various I/O regions in physical * memory. Do this on a per-card basis so that we choose the right * root bridge. * Note that the returned IO or memory base is a physical address */ SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus, unsigned long, devfn) { struct pci_controller* hose; long result = -EOPNOTSUPP; hose = pci_bus_to_hose(bus); if (!hose) return -ENODEV; switch (which) { case IOBASE_BRIDGE_NUMBER: return (long)hose->first_busno; case IOBASE_MEMORY: return (long)hose->mem_offset[0]; case IOBASE_IO: return (long)hose->io_base_phys; case IOBASE_ISA_IO: return (long)isa_io_base; case IOBASE_ISA_MEM: return (long)isa_mem_base; } return result; }