forked from luck/tmp_suning_uos_patched
3f8daeacd7
This moves the remaining common bits in to pci-lib. Thereby reducing pci.c/pci-new.c to simple bus fixups and controller registration. As more platforms are moved over, the old code will disappear completely and the pci-new bits will be rolled in to pci-lib, eventually replacing pci.c completely. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/*
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* New-style PCI core.
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*
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* Copyright (c) 2002 M. R. Brown
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* Copyright (c) 2004 - 2009 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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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/init.h>
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#include <linux/dma-debug.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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/*
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* The PCI controller list.
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*/
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static struct pci_channel *hose_head, **hose_tail = &hose_head;
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static int pci_initialized;
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static void __devinit pcibios_scanbus(struct pci_channel *hose)
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{
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static int next_busno;
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struct pci_bus *bus;
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/* Catch botched conversion attempts */
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BUG_ON(hose->init);
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bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
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if (bus) {
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next_busno = bus->subordinate + 1;
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/* Don't allow 8-bit bus number overflow inside the hose -
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reserve some space for bridges. */
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if (next_busno > 224)
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next_busno = 0;
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pci_bus_size_bridges(bus);
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pci_bus_assign_resources(bus);
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pci_enable_bridges(bus);
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}
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}
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static DEFINE_MUTEX(pci_scan_mutex);
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void __devinit register_pci_controller(struct pci_channel *hose)
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{
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if (request_resource(&iomem_resource, hose->mem_resource) < 0)
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goto out;
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if (request_resource(&ioport_resource, hose->io_resource) < 0) {
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release_resource(hose->mem_resource);
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goto out;
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}
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*hose_tail = hose;
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hose_tail = &hose->next;
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/*
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* Do not panic here but later - this might hapen before console init.
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*/
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if (!hose->io_map_base) {
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printk(KERN_WARNING
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"registering PCI controller with io_map_base unset\n");
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}
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/*
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* Scan the bus if it is register after the PCI subsystem
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* initialization.
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*/
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if (pci_initialized) {
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mutex_lock(&pci_scan_mutex);
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pcibios_scanbus(hose);
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mutex_unlock(&pci_scan_mutex);
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}
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return;
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out:
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printk(KERN_WARNING
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"Skipping PCI bus scan due to resource conflict\n");
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}
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static int __init pcibios_init(void)
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{
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struct pci_channel *hose;
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/* Scan all of the recorded PCI controllers. */
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for (hose = hose_head; hose; hose = hose->next)
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pcibios_scanbus(hose);
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pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);
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dma_debug_add_bus(&pci_bus_type);
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pci_initialized = 1;
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return 0;
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}
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subsys_initcall(pcibios_init);
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static void pcibios_fixup_device_resources(struct pci_dev *dev,
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struct pci_bus *bus)
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{
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/* Update device resources. */
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struct pci_channel *hose = bus->sysdata;
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unsigned long offset = 0;
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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if (!dev->resource[i].start)
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continue;
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if (dev->resource[i].flags & IORESOURCE_PCI_FIXED)
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continue;
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if (dev->resource[i].flags & IORESOURCE_IO)
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offset = hose->io_offset;
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else if (dev->resource[i].flags & IORESOURCE_MEM)
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offset = hose->mem_offset;
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dev->resource[i].start += offset;
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dev->resource[i].end += offset;
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}
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}
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/*
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* Called after each bus is probed, but before its children
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* are examined.
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*/
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void __devinit __weak pcibios_fixup_bus(struct pci_bus *bus)
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{
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struct pci_dev *dev = bus->self;
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struct list_head *ln;
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struct pci_channel *chan = bus->sysdata;
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if (!dev) {
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bus->resource[0] = chan->io_resource;
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bus->resource[1] = chan->mem_resource;
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}
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for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
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dev = pci_dev_b(ln);
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if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
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pcibios_fixup_device_resources(dev, bus);
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}
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}
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