/* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 2011 Wind River Systems, * written by Ralf Baechle (ralf@linux-mips.org) */ #include <linux/bug.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/bootmem.h> #include <linux/export.h> #include <linux/init.h> #include <linux/types.h> #include <linux/pci.h> #include <linux/of_address.h> #include <asm/cpu-info.h> /* * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource * assignments. */ /* * The PCI controller list. */ static struct pci_controller *hose_head, **hose_tail = &hose_head; unsigned long PCIBIOS_MIN_IO; unsigned long PCIBIOS_MIN_MEM; static int pci_initialized; /* * 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. * * Why? Because some silly external IO cards only decode * the low 10 bits of the IO address. The 0x00-0xff region * is reserved for motherboard devices that decode all 16 * bits, so it's ok to allocate at, say, 0x2800-0x28ff, * but we want to try to avoid allocating at 0x2900-0x2bff * which might have be mirrored at 0x0100-0x03ff.. */ 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_controller *hose = dev->sysdata; resource_size_t start = res->start; if (res->flags & IORESOURCE_IO) { /* Make sure we start at our min on all hoses */ if (start < PCIBIOS_MIN_IO + hose->io_resource->start) start = PCIBIOS_MIN_IO + hose->io_resource->start; /* * Put everything into 0x00-0xff region modulo 0x400 */ if (start & 0x300) start = (start + 0x3ff) & ~0x3ff; } else if (res->flags & IORESOURCE_MEM) { /* Make sure we start at our min on all hoses */ if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start) start = PCIBIOS_MIN_MEM + hose->mem_resource->start; } return start; } static void pcibios_scanbus(struct pci_controller *hose) { static int next_busno; static int need_domain_info; LIST_HEAD(resources); struct pci_bus *bus; if (!hose->iommu) PCI_DMA_BUS_IS_PHYS = 1; if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY)) next_busno = (*hose->get_busno)(); pci_add_resource_offset(&resources, hose->mem_resource, hose->mem_offset); pci_add_resource_offset(&resources, hose->io_resource, hose->io_offset); pci_add_resource_offset(&resources, hose->busn_resource, hose->busn_offset); bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose, &resources); hose->bus = bus; need_domain_info = need_domain_info || hose->index; hose->need_domain_info = need_domain_info; if (!bus) { pci_free_resource_list(&resources); return; } next_busno = 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; } if (!pci_has_flag(PCI_PROBE_ONLY)) { pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); } pci_bus_add_devices(bus); } #ifdef CONFIG_OF void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node) { struct of_pci_range range; struct of_pci_range_parser parser; pr_info("PCI host bridge %s ranges:\n", node->full_name); hose->of_node = node; if (of_pci_range_parser_init(&parser, node)) return; for_each_of_pci_range(&parser, &range) { struct resource *res = NULL; switch (range.flags & IORESOURCE_TYPE_BITS) { case IORESOURCE_IO: pr_info(" IO 0x%016llx..0x%016llx\n", range.cpu_addr, range.cpu_addr + range.size - 1); hose->io_map_base = (unsigned long)ioremap(range.cpu_addr, range.size); res = hose->io_resource; break; case IORESOURCE_MEM: pr_info(" MEM 0x%016llx..0x%016llx\n", range.cpu_addr, range.cpu_addr + range.size - 1); res = hose->mem_resource; break; } if (res != NULL) of_pci_range_to_resource(&range, node, res); } } struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) { struct pci_controller *hose = bus->sysdata; return of_node_get(hose->of_node); } #endif static DEFINE_MUTEX(pci_scan_mutex); void register_pci_controller(struct pci_controller *hose) { struct resource *parent; parent = hose->mem_resource->parent; if (!parent) parent = &iomem_resource; if (request_resource(parent, hose->mem_resource) < 0) goto out; parent = hose->io_resource->parent; if (!parent) parent = &ioport_resource; if (request_resource(parent, hose->io_resource) < 0) { release_resource(hose->mem_resource); 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) { printk(KERN_WARNING "registering PCI controller with io_map_base unset\n"); } /* * 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; out: printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n"); } static void __init pcibios_set_cache_line_size(void) { struct cpuinfo_mips *c = ¤t_cpu_data; unsigned int lsize; /* * Set PCI cacheline size to that of the highest level in the * cache hierarchy. */ lsize = c->dcache.linesz; lsize = c->scache.linesz ? : lsize; lsize = c->tcache.linesz ? : lsize; BUG_ON(!lsize); pci_dfl_cache_line_size = lsize >> 2; pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); } static int __init pcibios_init(void) { struct pci_controller *hose; pcibios_set_cache_line_size(); /* Scan all of the recorded PCI controllers. */ for (hose = hose_head; hose; hose = hose->next) pcibios_scanbus(hose); pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq); pci_initialized = 1; return 0; } subsys_initcall(pcibios_init); static int pcibios_enable_resources(struct pci_dev *dev, int mask) { u16 cmd, old_cmd; int idx; struct resource *r; pci_read_config_word(dev, PCI_COMMAND, &cmd); old_cmd = cmd; for (idx=0; idx < PCI_NUM_RESOURCES; idx++) { /* Only set up the requested stuff */ if (!(mask & (1<<idx))) continue; r = &dev->resource[idx]; if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) continue; if ((idx == PCI_ROM_RESOURCE) && (!(r->flags & IORESOURCE_ROM_ENABLE))) continue; if (!r->start && r->end) { printk(KERN_ERR "PCI: Device %s not available " "because of resource collisions\n", pci_name(dev)); return -EINVAL; } if (r->flags & IORESOURCE_IO) cmd |= PCI_COMMAND_IO; if (r->flags & IORESOURCE_MEM) cmd |= PCI_COMMAND_MEMORY; } if (cmd != old_cmd) { printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd); pci_write_config_word(dev, PCI_COMMAND, cmd); } return 0; } unsigned int pcibios_assign_all_busses(void) { return 1; } int pcibios_enable_device(struct pci_dev *dev, int mask) { int err; if ((err = pcibios_enable_resources(dev, mask)) < 0) return err; return pcibios_plat_dev_init(dev); } void pcibios_fixup_bus(struct pci_bus *bus) { } EXPORT_SYMBOL(PCIBIOS_MIN_IO); EXPORT_SYMBOL(PCIBIOS_MIN_MEM); int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { unsigned long prot; /* * I/O space can be accessed via normal processor loads and stores on * this platform but for now we elect not to do this and portable * drivers should not do this anyway. */ if (mmap_state == pci_mmap_io) return -EINVAL; /* * Ignore write-combine; for now only return uncached mappings. */ prot = pgprot_val(vma->vm_page_prot); prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; vma->vm_page_prot = __pgprot(prot); return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start, vma->vm_page_prot); } char * (*pcibios_plat_setup)(char *str) __initdata; char *__init pcibios_setup(char *str) { if (pcibios_plat_setup) return pcibios_plat_setup(str); return str; }