// SPDX-License-Identifier: GPL-2.0 /* * New-style PCI core. * * Copyright (c) 2004 - 2009 Paul Mundt * Copyright (c) 2002 M. R. Brown * * Modelled after arch/mips/pci/pci.c: * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org) */ #include #include #include #include #include #include #include #include #include #include unsigned long PCIBIOS_MIN_IO = 0x0000; unsigned long PCIBIOS_MIN_MEM = 0; /* * The PCI controller list. */ static struct pci_channel *hose_head, **hose_tail = &hose_head; static int pci_initialized; static void pcibios_scanbus(struct pci_channel *hose) { static int next_busno; static int need_domain_info; LIST_HEAD(resources); struct resource *res; resource_size_t offset; int i, ret; struct pci_host_bridge *bridge; bridge = pci_alloc_host_bridge(0); if (!bridge) return; for (i = 0; i < hose->nr_resources; i++) { res = hose->resources + i; offset = 0; if (res->flags & IORESOURCE_DISABLED) continue; if (res->flags & IORESOURCE_IO) offset = hose->io_offset; else if (res->flags & IORESOURCE_MEM) offset = hose->mem_offset; pci_add_resource_offset(&resources, res, offset); } list_splice_init(&resources, &bridge->windows); bridge->dev.parent = NULL; bridge->sysdata = hose; bridge->busnr = next_busno; bridge->ops = hose->pci_ops; bridge->swizzle_irq = pci_common_swizzle; bridge->map_irq = pcibios_map_platform_irq; ret = pci_scan_root_bus_bridge(bridge); if (ret) { pci_free_host_bridge(bridge); return; } hose->bus = bridge->bus; need_domain_info = need_domain_info || hose->index; hose->need_domain_info = need_domain_info; next_busno = hose->bus->busn_res.end + 1; /* Don't allow 8-bit bus number overflow inside the hose - reserve some space for bridges. */ if (next_busno > 224) { next_busno = 0; need_domain_info = 1; } pci_bus_size_bridges(hose->bus); pci_bus_assign_resources(hose->bus); pci_bus_add_devices(hose->bus); } /* * This interrupt-safe spinlock protects all accesses to PCI * configuration space. */ DEFINE_RAW_SPINLOCK(pci_config_lock); static DEFINE_MUTEX(pci_scan_mutex); int register_pci_controller(struct pci_channel *hose) { int i; for (i = 0; i < hose->nr_resources; i++) { struct resource *res = hose->resources + i; if (res->flags & IORESOURCE_DISABLED) continue; if (res->flags & IORESOURCE_IO) { if (request_resource(&ioport_resource, res) < 0) goto out; } else { if (request_resource(&iomem_resource, res) < 0) goto out; } } *hose_tail = hose; hose_tail = &hose->next; /* * Do not panic here but later - this might happen before console init. */ if (!hose->io_map_base) { pr_warn("registering PCI controller with io_map_base unset\n"); } /* * Setup the ERR/PERR and SERR timers, if available. */ pcibios_enable_timers(hose); /* * Scan the bus if it is register after the PCI subsystem * initialization. */ if (pci_initialized) { mutex_lock(&pci_scan_mutex); pcibios_scanbus(hose); mutex_unlock(&pci_scan_mutex); } return 0; out: for (--i; i >= 0; i--) release_resource(&hose->resources[i]); pr_warn("Skipping PCI bus scan due to resource conflict\n"); return -1; } static int __init pcibios_init(void) { struct pci_channel *hose; /* Scan all of the recorded PCI controllers. */ for (hose = hose_head; hose; hose = hose->next) pcibios_scanbus(hose); pci_initialized = 1; return 0; } subsys_initcall(pcibios_init); /* * We need to avoid collisions with `mirrored' VGA ports * and other strange ISA hardware, so we always want the * addresses to be allocated in the 0x000-0x0ff region * modulo 0x400. */ resource_size_t pcibios_align_resource(void *data, const struct resource *res, resource_size_t size, resource_size_t align) { struct pci_dev *dev = data; struct pci_channel *hose = dev->sysdata; resource_size_t start = res->start; if (res->flags & IORESOURCE_IO) { if (start < PCIBIOS_MIN_IO + hose->resources[0].start) start = PCIBIOS_MIN_IO + hose->resources[0].start; /* * Put everything into 0x00-0xff region modulo 0x400. */ if (start & 0x300) start = (start + 0x3ff) & ~0x3ff; } return start; } static void __init pcibios_bus_report_status_early(struct pci_channel *hose, int top_bus, int current_bus, unsigned int status_mask, int warn) { unsigned int pci_devfn; u16 status; int ret; for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) { if (PCI_FUNC(pci_devfn)) continue; ret = early_read_config_word(hose, top_bus, current_bus, pci_devfn, PCI_STATUS, &status); if (ret != PCIBIOS_SUCCESSFUL) continue; if (status == 0xffff) continue; early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_STATUS, status & status_mask); if (warn) pr_cont("(%02x:%02x: %04X) ", current_bus, pci_devfn, status); } } /* * We can't use pci_find_device() here since we are * called from interrupt context. */ static void __ref pcibios_bus_report_status(struct pci_bus *bus, unsigned int status_mask, int warn) { struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) { u16 status; /* * ignore host bridge - we handle * that separately */ if (dev->bus->number == 0 && dev->devfn == 0) continue; pci_read_config_word(dev, PCI_STATUS, &status); if (status == 0xffff) continue; if ((status & status_mask) == 0) continue; /* clear the status errors */ pci_write_config_word(dev, PCI_STATUS, status & status_mask); if (warn) pr_cont("(%s: %04X) ", pci_name(dev), status); } list_for_each_entry(dev, &bus->devices, bus_list) if (dev->subordinate) pcibios_bus_report_status(dev->subordinate, status_mask, warn); } void __ref pcibios_report_status(unsigned int status_mask, int warn) { struct pci_channel *hose; for (hose = hose_head; hose; hose = hose->next) { if (unlikely(!hose->bus)) pcibios_bus_report_status_early(hose, hose_head->index, hose->index, status_mask, warn); else pcibios_bus_report_status(hose->bus, status_mask, warn); } } #ifndef CONFIG_GENERIC_IOMAP void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port, unsigned int nr) { struct pci_channel *chan = dev->sysdata; if (unlikely(!chan->io_map_base)) { chan->io_map_base = sh_io_port_base; if (pci_domains_supported) panic("To avoid data corruption io_map_base MUST be " "set with multiple PCI domains."); } return (void __iomem *)(chan->io_map_base + port); } void pci_iounmap(struct pci_dev *dev, void __iomem *addr) { iounmap(addr); } EXPORT_SYMBOL(pci_iounmap); #endif /* CONFIG_GENERIC_IOMAP */ EXPORT_SYMBOL(PCIBIOS_MIN_IO); EXPORT_SYMBOL(PCIBIOS_MIN_MEM);