diff options
Diffstat (limited to 'arch/powerpc/kernel/pci_64.c')
-rw-r--r-- | arch/powerpc/kernel/pci_64.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c new file mode 100644 index 0000000000..e27342ef12 --- /dev/null +++ b/arch/powerpc/kernel/pci_64.c @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Port for PPC64 David Engebretsen, IBM Corp. + * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. + * + * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM + * Rework, based on alpha PCI code. + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/list.h> +#include <linux/syscalls.h> +#include <linux/irq.h> +#include <linux/vmalloc.h> +#include <linux/of.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/byteorder.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> + +/* pci_io_base -- the base address from which io bars are offsets. + * This is the lowest I/O base address (so bar values are always positive), + * and it *must* be the start of ISA space if an ISA bus exists because + * ISA drivers use hard coded offsets. If no ISA bus exists nothing + * is mapped on the first 64K of IO space + */ +unsigned long pci_io_base; +EXPORT_SYMBOL(pci_io_base); + +static int __init pcibios_init(void) +{ + struct pci_controller *hose, *tmp; + + printk(KERN_INFO "PCI: Probing PCI hardware\n"); + + /* For now, override phys_mem_access_prot. If we need it,g + * later, we may move that initialization to each ppc_md + */ + ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot; + + /* On ppc64, we always enable PCI domains and we keep domain 0 + * backward compatible in /proc for video cards + */ + pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); + + /* Scan all of the recorded PCI controllers. */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + pcibios_scan_phb(hose); + + /* Call common code to handle resource allocation */ + pcibios_resource_survey(); + + /* Add devices. */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + pci_bus_add_devices(hose->bus); + + /* Call machine dependent fixup */ + if (ppc_md.pcibios_fixup) + ppc_md.pcibios_fixup(); + + printk(KERN_DEBUG "PCI: Probing PCI hardware done\n"); + + return 0; +} + +subsys_initcall_sync(pcibios_init); + +int pcibios_unmap_io_space(struct pci_bus *bus) +{ + struct pci_controller *hose; + + WARN_ON(bus == NULL); + + /* If this is not a PHB, we only flush the hash table over + * the area mapped by this bridge. We don't play with the PTE + * mappings since we might have to deal with sub-page alignments + * so flushing the hash table is the only sane way to make sure + * that no hash entries are covering that removed bridge area + * while still allowing other busses overlapping those pages + * + * Note: If we ever support P2P hotplug on Book3E, we'll have + * to do an appropriate TLB flush here too + */ + if (bus->self) { +#ifdef CONFIG_PPC_BOOK3S_64 + struct resource *res = bus->resource[0]; +#endif + + pr_debug("IO unmapping for PCI-PCI bridge %s\n", + pci_name(bus->self)); + +#ifdef CONFIG_PPC_BOOK3S_64 + __flush_hash_table_range(res->start + _IO_BASE, + res->end + _IO_BASE + 1); +#endif + return 0; + } + + /* Get the host bridge */ + hose = pci_bus_to_host(bus); + + pr_debug("IO unmapping for PHB %pOF\n", hose->dn); + pr_debug(" alloc=0x%p\n", hose->io_base_alloc); + + iounmap(hose->io_base_alloc); + return 0; +} +EXPORT_SYMBOL_GPL(pcibios_unmap_io_space); + +void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size) +{ + struct vm_struct *area; + unsigned long addr; + + WARN_ON_ONCE(paddr & ~PAGE_MASK); + WARN_ON_ONCE(size & ~PAGE_MASK); + + /* + * Let's allocate some IO space for that guy. We don't pass VM_IOREMAP + * because we don't care about alignment tricks that the core does in + * that case. Maybe we should due to stupid card with incomplete + * address decoding but I'd rather not deal with those outside of the + * reserved 64K legacy region. + */ + area = __get_vm_area_caller(size, VM_IOREMAP, PHB_IO_BASE, PHB_IO_END, + __builtin_return_address(0)); + if (!area) + return NULL; + + addr = (unsigned long)area->addr; + if (ioremap_page_range(addr, addr + size, paddr, + pgprot_noncached(PAGE_KERNEL))) { + vunmap_range(addr, addr + size); + return NULL; + } + + return (void __iomem *)addr; +} +EXPORT_SYMBOL_GPL(ioremap_phb); + +static int pcibios_map_phb_io_space(struct pci_controller *hose) +{ + unsigned long phys_page; + unsigned long size_page; + unsigned long io_virt_offset; + + phys_page = ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE); + size_page = ALIGN(hose->pci_io_size, PAGE_SIZE); + + /* Make sure IO area address is clear */ + hose->io_base_alloc = NULL; + + /* If there's no IO to map on that bus, get away too */ + if (hose->pci_io_size == 0 || hose->io_base_phys == 0) + return 0; + + /* Let's allocate some IO space for that guy. We don't pass + * VM_IOREMAP because we don't care about alignment tricks that + * the core does in that case. Maybe we should due to stupid card + * with incomplete address decoding but I'd rather not deal with + * those outside of the reserved 64K legacy region. + */ + hose->io_base_alloc = ioremap_phb(phys_page, size_page); + if (!hose->io_base_alloc) + return -ENOMEM; + hose->io_base_virt = hose->io_base_alloc + + hose->io_base_phys - phys_page; + + pr_debug("IO mapping for PHB %pOF\n", hose->dn); + pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n", + hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc); + pr_debug(" size=0x%016llx (alloc=0x%016lx)\n", + hose->pci_io_size, size_page); + + /* Fixup hose IO resource */ + io_virt_offset = pcibios_io_space_offset(hose); + hose->io_resource.start += io_virt_offset; + hose->io_resource.end += io_virt_offset; + + pr_debug(" hose->io_resource=%pR\n", &hose->io_resource); + + return 0; +} + +int pcibios_map_io_space(struct pci_bus *bus) +{ + WARN_ON(bus == NULL); + + /* If this not a PHB, nothing to do, page tables still exist and + * thus HPTEs will be faulted in when needed + */ + if (bus->self) { + pr_debug("IO mapping for PCI-PCI bridge %s\n", + pci_name(bus->self)); + pr_debug(" virt=0x%016llx...0x%016llx\n", + bus->resource[0]->start + _IO_BASE, + bus->resource[0]->end + _IO_BASE); + return 0; + } + + return pcibios_map_phb_io_space(pci_bus_to_host(bus)); +} +EXPORT_SYMBOL_GPL(pcibios_map_io_space); + +void pcibios_setup_phb_io_space(struct pci_controller *hose) +{ + pcibios_map_phb_io_space(hose); +} + +#define IOBASE_BRIDGE_NUMBER 0 +#define IOBASE_MEMORY 1 +#define IOBASE_IO 2 +#define IOBASE_ISA_IO 3 +#define IOBASE_ISA_MEM 4 + +SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus, + unsigned long, in_devfn) +{ + struct pci_controller* hose; + struct pci_bus *tmp_bus, *bus = NULL; + struct device_node *hose_node; + + /* Argh ! Please forgive me for that hack, but that's the + * simplest way to get existing XFree to not lockup on some + * G5 machines... So when something asks for bus 0 io base + * (bus 0 is HT root), we return the AGP one instead. + */ + if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) { + struct device_node *agp; + + agp = of_find_compatible_node(NULL, NULL, "u3-agp"); + if (agp) + in_bus = 0xf0; + of_node_put(agp); + } + + /* That syscall isn't quite compatible with PCI domains, but it's + * used on pre-domains setup. We return the first match + */ + + list_for_each_entry(tmp_bus, &pci_root_buses, node) { + if (in_bus >= tmp_bus->number && + in_bus <= tmp_bus->busn_res.end) { + bus = tmp_bus; + break; + } + } + if (bus == NULL || bus->dev.of_node == NULL) + return -ENODEV; + + hose_node = bus->dev.of_node; + hose = PCI_DN(hose_node)->phb; + + 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 -EINVAL; + } + + return -EOPNOTSUPP; +} + +#ifdef CONFIG_NUMA +int pcibus_to_node(struct pci_bus *bus) +{ + struct pci_controller *phb = pci_bus_to_host(bus); + return phb->node; +} +EXPORT_SYMBOL(pcibus_to_node); +#endif + +#ifdef CONFIG_PPC_PMAC +int pci_device_from_OF_node(struct device_node *np, u8 *bus, u8 *devfn) +{ + if (!PCI_DN(np)) + return -ENODEV; + *bus = PCI_DN(np)->busno; + *devfn = PCI_DN(np)->devfn; + return 0; +} +#endif |