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 000000000..e27342ef1
--- /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