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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/powerpc/kernel/pci_64.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/pci_64.c')
-rw-r--r--arch/powerpc/kernel/pci_64.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
new file mode 100644
index 00000000000..3318d39b7d4
--- /dev/null
+++ b/arch/powerpc/kernel/pci_64.c
@@ -0,0 +1,277 @@
+/*
+ * 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.
+ *
+ * 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.
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.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 <asm/processor.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#include <asm/byteorder.h>
+#include <asm/machdep.h>
+#include <asm/ppc-pci.h>
+
+unsigned long pci_probe_only = 1;
+
+/* 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 = ISA_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;
+
+ if (pci_probe_only)
+ pci_add_flags(PCI_PROBE_ONLY);
+
+ /* 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);
+ pci_bus_add_devices(hose->bus);
+ }
+
+ /* Call common code to handle resource allocation */
+ pcibios_resource_survey();
+
+ printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");
+
+ return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+#ifdef CONFIG_HOTPLUG
+
+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 alignemnts
+ * 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_STD_MMU_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_STD_MMU_64
+ __flush_hash_table_range(&init_mm, res->start + _IO_BASE,
+ res->end + _IO_BASE + 1);
+#endif
+ return 0;
+ }
+
+ /* Get the host bridge */
+ hose = pci_bus_to_host(bus);
+
+ /* Check if we have IOs allocated */
+ if (hose->io_base_alloc == 0)
+ return 0;
+
+ pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name);
+ pr_debug(" alloc=0x%p\n", hose->io_base_alloc);
+
+ /* This is a PHB, we fully unmap the IO area */
+ vunmap(hose->io_base_alloc);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
+
+#endif /* CONFIG_HOTPLUG */
+
+static int __devinit pcibios_map_phb_io_space(struct pci_controller *hose)
+{
+ struct vm_struct *area;
+ 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_UP(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.
+ */
+ area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
+ if (area == NULL)
+ return -ENOMEM;
+ hose->io_base_alloc = area->addr;
+ hose->io_base_virt = (void __iomem *)(area->addr +
+ hose->io_base_phys - phys_page);
+
+ pr_debug("IO mapping for PHB %s\n", hose->dn->full_name);
+ 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);
+
+ /* Establish the mapping */
+ if (__ioremap_at(phys_page, area->addr, size_page,
+ _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)
+ return -ENOMEM;
+
+ /* Fixup hose IO resource */
+ io_virt_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ 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 __devinit 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 __devinit 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
+
+long sys_pciconfig_iobase(long which, unsigned long in_bus,
+ unsigned long in_devfn)
+{
+ struct pci_controller* hose;
+ struct list_head *ln;
+ struct pci_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
+ */
+
+ for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
+ bus = pci_bus_b(ln);
+ if (in_bus >= bus->number && in_bus <= bus->subordinate)
+ break;
+ bus = NULL;
+ }
+ 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->pci_mem_offset;
+ 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