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320 lines
7.8 KiB
320 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Common pmac/prep/chrp pci routines. -- Cort |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/pci.h> |
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#include <linux/delay.h> |
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#include <linux/string.h> |
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#include <linux/init.h> |
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#include <linux/capability.h> |
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#include <linux/sched.h> |
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#include <linux/errno.h> |
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#include <linux/memblock.h> |
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#include <linux/syscalls.h> |
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#include <linux/irq.h> |
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#include <linux/list.h> |
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#include <linux/of.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <asm/processor.h> |
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#include <asm/io.h> |
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#include <asm/prom.h> |
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#include <asm/sections.h> |
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#include <asm/pci-bridge.h> |
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#include <asm/ppc-pci.h> |
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#include <asm/byteorder.h> |
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#include <linux/uaccess.h> |
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#include <asm/machdep.h> |
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#undef DEBUG |
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unsigned long isa_io_base = 0; |
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unsigned long pci_dram_offset = 0; |
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int pcibios_assign_bus_offset = 1; |
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EXPORT_SYMBOL(isa_io_base); |
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EXPORT_SYMBOL(pci_dram_offset); |
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void pcibios_make_OF_bus_map(void); |
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static void fixup_cpc710_pci64(struct pci_dev* dev); |
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static u8* pci_to_OF_bus_map; |
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/* By default, we don't re-assign bus numbers. We do this only on |
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* some pmacs |
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*/ |
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static int pci_assign_all_buses; |
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static int pci_bus_count; |
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/* This will remain NULL for now, until isa-bridge.c is made common |
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* to both 32-bit and 64-bit. |
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*/ |
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struct pci_dev *isa_bridge_pcidev; |
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EXPORT_SYMBOL_GPL(isa_bridge_pcidev); |
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static void |
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fixup_cpc710_pci64(struct pci_dev* dev) |
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{ |
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/* Hide the PCI64 BARs from the kernel as their content doesn't |
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* fit well in the resource management |
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*/ |
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dev->resource[0].start = dev->resource[0].end = 0; |
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dev->resource[0].flags = 0; |
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dev->resource[1].start = dev->resource[1].end = 0; |
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dev->resource[1].flags = 0; |
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} |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); |
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/* |
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* Functions below are used on OpenFirmware machines. |
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*/ |
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static void |
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make_one_node_map(struct device_node* node, u8 pci_bus) |
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{ |
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const int *bus_range; |
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int len; |
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if (pci_bus >= pci_bus_count) |
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return; |
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bus_range = of_get_property(node, "bus-range", &len); |
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if (bus_range == NULL || len < 2 * sizeof(int)) { |
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printk(KERN_WARNING "Can't get bus-range for %pOF, " |
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"assuming it starts at 0\n", node); |
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pci_to_OF_bus_map[pci_bus] = 0; |
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} else |
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pci_to_OF_bus_map[pci_bus] = bus_range[0]; |
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for_each_child_of_node(node, node) { |
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struct pci_dev* dev; |
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const unsigned int *class_code, *reg; |
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class_code = of_get_property(node, "class-code", NULL); |
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if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && |
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(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) |
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continue; |
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reg = of_get_property(node, "reg", NULL); |
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if (!reg) |
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continue; |
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dev = pci_get_domain_bus_and_slot(0, pci_bus, |
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((reg[0] >> 8) & 0xff)); |
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if (!dev || !dev->subordinate) { |
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pci_dev_put(dev); |
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continue; |
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} |
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make_one_node_map(node, dev->subordinate->number); |
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pci_dev_put(dev); |
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} |
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} |
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void |
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pcibios_make_OF_bus_map(void) |
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{ |
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int i; |
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struct pci_controller *hose, *tmp; |
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struct property *map_prop; |
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struct device_node *dn; |
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pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); |
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if (!pci_to_OF_bus_map) { |
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printk(KERN_ERR "Can't allocate OF bus map !\n"); |
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return; |
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} |
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/* We fill the bus map with invalid values, that helps |
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* debugging. |
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*/ |
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for (i=0; i<pci_bus_count; i++) |
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pci_to_OF_bus_map[i] = 0xff; |
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/* For each hose, we begin searching bridges */ |
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list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
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struct device_node* node = hose->dn; |
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if (!node) |
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continue; |
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make_one_node_map(node, hose->first_busno); |
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} |
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dn = of_find_node_by_path("/"); |
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map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); |
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if (map_prop) { |
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BUG_ON(pci_bus_count > map_prop->length); |
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memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); |
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} |
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of_node_put(dn); |
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#ifdef DEBUG |
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printk("PCI->OF bus map:\n"); |
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for (i=0; i<pci_bus_count; i++) { |
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if (pci_to_OF_bus_map[i] == 0xff) |
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continue; |
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printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); |
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} |
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#endif |
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} |
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/* |
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* Returns the PCI device matching a given OF node |
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*/ |
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int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) |
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{ |
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struct pci_dev *dev = NULL; |
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const __be32 *reg; |
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int size; |
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/* Check if it might have a chance to be a PCI device */ |
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if (!pci_find_hose_for_OF_device(node)) |
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return -ENODEV; |
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reg = of_get_property(node, "reg", &size); |
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if (!reg || size < 5 * sizeof(u32)) |
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return -ENODEV; |
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*bus = (be32_to_cpup(®[0]) >> 16) & 0xff; |
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*devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; |
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/* Ok, here we need some tweak. If we have already renumbered |
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* all busses, we can't rely on the OF bus number any more. |
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* the pci_to_OF_bus_map is not enough as several PCI busses |
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* may match the same OF bus number. |
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*/ |
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if (!pci_to_OF_bus_map) |
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return 0; |
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for_each_pci_dev(dev) |
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if (pci_to_OF_bus_map[dev->bus->number] == *bus && |
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dev->devfn == *devfn) { |
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*bus = dev->bus->number; |
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pci_dev_put(dev); |
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return 0; |
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} |
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return -ENODEV; |
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} |
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EXPORT_SYMBOL(pci_device_from_OF_node); |
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/* We create the "pci-OF-bus-map" property now so it appears in the |
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* /proc device tree |
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*/ |
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void __init |
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pci_create_OF_bus_map(void) |
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{ |
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struct property* of_prop; |
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struct device_node *dn; |
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of_prop = memblock_alloc(sizeof(struct property) + 256, |
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SMP_CACHE_BYTES); |
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if (!of_prop) |
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panic("%s: Failed to allocate %zu bytes\n", __func__, |
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sizeof(struct property) + 256); |
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dn = of_find_node_by_path("/"); |
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if (dn) { |
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memset(of_prop, -1, sizeof(struct property) + 256); |
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of_prop->name = "pci-OF-bus-map"; |
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of_prop->length = 256; |
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of_prop->value = &of_prop[1]; |
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of_add_property(dn, of_prop); |
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of_node_put(dn); |
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} |
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} |
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void pcibios_setup_phb_io_space(struct pci_controller *hose) |
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{ |
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unsigned long io_offset; |
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struct resource *res = &hose->io_resource; |
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/* Fixup IO space offset */ |
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io_offset = pcibios_io_space_offset(hose); |
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res->start += io_offset; |
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res->end += io_offset; |
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} |
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static int __init pcibios_init(void) |
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{ |
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struct pci_controller *hose, *tmp; |
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int next_busno = 0; |
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printk(KERN_INFO "PCI: Probing PCI hardware\n"); |
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if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) |
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pci_assign_all_buses = 1; |
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/* Scan all of the recorded PCI controllers. */ |
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list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
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if (pci_assign_all_buses) |
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hose->first_busno = next_busno; |
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hose->last_busno = 0xff; |
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pcibios_scan_phb(hose); |
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pci_bus_add_devices(hose->bus); |
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if (pci_assign_all_buses || next_busno <= hose->last_busno) |
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next_busno = hose->last_busno + pcibios_assign_bus_offset; |
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} |
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pci_bus_count = next_busno; |
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/* OpenFirmware based machines need a map of OF bus |
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* numbers vs. kernel bus numbers since we may have to |
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* remap them. |
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*/ |
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if (pci_assign_all_buses) |
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pcibios_make_OF_bus_map(); |
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/* Call common code to handle resource allocation */ |
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pcibios_resource_survey(); |
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/* Call machine dependent fixup */ |
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if (ppc_md.pcibios_fixup) |
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ppc_md.pcibios_fixup(); |
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/* Call machine dependent post-init code */ |
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if (ppc_md.pcibios_after_init) |
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ppc_md.pcibios_after_init(); |
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return 0; |
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} |
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subsys_initcall(pcibios_init); |
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static struct pci_controller* |
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pci_bus_to_hose(int bus) |
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{ |
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struct pci_controller *hose, *tmp; |
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list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
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if (bus >= hose->first_busno && bus <= hose->last_busno) |
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return hose; |
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return NULL; |
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} |
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/* Provide information on locations of various I/O regions in physical |
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* memory. Do this on a per-card basis so that we choose the right |
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* root bridge. |
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* Note that the returned IO or memory base is a physical address |
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*/ |
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SYSCALL_DEFINE3(pciconfig_iobase, long, which, |
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unsigned long, bus, unsigned long, devfn) |
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{ |
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struct pci_controller* hose; |
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long result = -EOPNOTSUPP; |
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hose = pci_bus_to_hose(bus); |
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if (!hose) |
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return -ENODEV; |
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switch (which) { |
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case IOBASE_BRIDGE_NUMBER: |
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return (long)hose->first_busno; |
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case IOBASE_MEMORY: |
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return (long)hose->mem_offset[0]; |
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case IOBASE_IO: |
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return (long)hose->io_base_phys; |
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case IOBASE_ISA_IO: |
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return (long)isa_io_base; |
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case IOBASE_ISA_MEM: |
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return (long)isa_mem_base; |
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} |
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return result; |
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}
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