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aa23bdc0a8
Tell the PCI core about host bridge address translation so it can take care of bus-to-resource conversion for us. CC: Michal Simek <monstr@monstr.eu> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
1647 lines
46 KiB
C
1647 lines
46 KiB
C
/*
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* Contains common pci routines for ALL ppc platform
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* (based on pci_32.c and pci_64.c)
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*
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* Port for PPC64 David Engebretsen, IBM Corp.
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* Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
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*
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* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
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* Rework, based on alpha PCI code.
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*
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* Common pmac/prep/chrp pci routines. -- Cort
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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/string.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mm.h>
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#include <linux/list.h>
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#include <linux/syscalls.h>
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#include <linux/irq.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.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/pci-bridge.h>
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#include <asm/byteorder.h>
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static DEFINE_SPINLOCK(hose_spinlock);
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LIST_HEAD(hose_list);
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/* XXX kill that some day ... */
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static int global_phb_number; /* Global phb counter */
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/* ISA Memory physical address */
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resource_size_t isa_mem_base;
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static struct dma_map_ops *pci_dma_ops = &dma_direct_ops;
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unsigned long isa_io_base;
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unsigned long pci_dram_offset;
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static int pci_bus_count;
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void set_pci_dma_ops(struct dma_map_ops *dma_ops)
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{
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pci_dma_ops = dma_ops;
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}
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struct dma_map_ops *get_pci_dma_ops(void)
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{
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return pci_dma_ops;
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}
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EXPORT_SYMBOL(get_pci_dma_ops);
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struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
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{
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struct pci_controller *phb;
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phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
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if (!phb)
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return NULL;
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spin_lock(&hose_spinlock);
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phb->global_number = global_phb_number++;
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list_add_tail(&phb->list_node, &hose_list);
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spin_unlock(&hose_spinlock);
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phb->dn = dev;
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phb->is_dynamic = mem_init_done;
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return phb;
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}
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void pcibios_free_controller(struct pci_controller *phb)
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{
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spin_lock(&hose_spinlock);
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list_del(&phb->list_node);
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spin_unlock(&hose_spinlock);
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if (phb->is_dynamic)
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kfree(phb);
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}
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static resource_size_t pcibios_io_size(const struct pci_controller *hose)
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{
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return resource_size(&hose->io_resource);
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}
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int pcibios_vaddr_is_ioport(void __iomem *address)
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{
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int ret = 0;
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struct pci_controller *hose;
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resource_size_t size;
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spin_lock(&hose_spinlock);
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list_for_each_entry(hose, &hose_list, list_node) {
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size = pcibios_io_size(hose);
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if (address >= hose->io_base_virt &&
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address < (hose->io_base_virt + size)) {
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ret = 1;
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break;
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}
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}
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spin_unlock(&hose_spinlock);
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return ret;
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}
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unsigned long pci_address_to_pio(phys_addr_t address)
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{
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struct pci_controller *hose;
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resource_size_t size;
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unsigned long ret = ~0;
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spin_lock(&hose_spinlock);
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list_for_each_entry(hose, &hose_list, list_node) {
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size = pcibios_io_size(hose);
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if (address >= hose->io_base_phys &&
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address < (hose->io_base_phys + size)) {
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unsigned long base =
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(unsigned long)hose->io_base_virt - _IO_BASE;
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ret = base + (address - hose->io_base_phys);
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break;
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}
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}
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spin_unlock(&hose_spinlock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_address_to_pio);
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/*
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* Return the domain number for this bus.
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*/
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int pci_domain_nr(struct pci_bus *bus)
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{
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struct pci_controller *hose = pci_bus_to_host(bus);
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return hose->global_number;
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}
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EXPORT_SYMBOL(pci_domain_nr);
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/* This routine is meant to be used early during boot, when the
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* PCI bus numbers have not yet been assigned, and you need to
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* issue PCI config cycles to an OF device.
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* It could also be used to "fix" RTAS config cycles if you want
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* to set pci_assign_all_buses to 1 and still use RTAS for PCI
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* config cycles.
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*/
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struct pci_controller *pci_find_hose_for_OF_device(struct device_node *node)
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{
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while (node) {
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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 (hose->dn == node)
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return hose;
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node = node->parent;
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}
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return NULL;
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}
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static ssize_t pci_show_devspec(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev;
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struct device_node *np;
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pdev = to_pci_dev(dev);
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np = pci_device_to_OF_node(pdev);
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if (np == NULL || np->full_name == NULL)
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return 0;
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return sprintf(buf, "%s", np->full_name);
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}
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static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
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/* Add sysfs properties */
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int pcibios_add_platform_entries(struct pci_dev *pdev)
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{
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return device_create_file(&pdev->dev, &dev_attr_devspec);
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}
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void pcibios_set_master(struct pci_dev *dev)
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{
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/* No special bus mastering setup handling */
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}
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char __devinit *pcibios_setup(char *str)
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{
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return str;
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}
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/*
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* Reads the interrupt pin to determine if interrupt is use by card.
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* If the interrupt is used, then gets the interrupt line from the
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* openfirmware and sets it in the pci_dev and pci_config line.
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*/
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int pci_read_irq_line(struct pci_dev *pci_dev)
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{
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struct of_irq oirq;
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unsigned int virq;
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/* The current device-tree that iSeries generates from the HV
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* PCI informations doesn't contain proper interrupt routing,
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* and all the fallback would do is print out crap, so we
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* don't attempt to resolve the interrupts here at all, some
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* iSeries specific fixup does it.
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*
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* In the long run, we will hopefully fix the generated device-tree
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* instead.
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*/
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pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
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#ifdef DEBUG
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memset(&oirq, 0xff, sizeof(oirq));
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#endif
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/* Try to get a mapping from the device-tree */
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if (of_irq_map_pci(pci_dev, &oirq)) {
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u8 line, pin;
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/* If that fails, lets fallback to what is in the config
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* space and map that through the default controller. We
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* also set the type to level low since that's what PCI
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* interrupts are. If your platform does differently, then
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* either provide a proper interrupt tree or don't use this
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* function.
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*/
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if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
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return -1;
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if (pin == 0)
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return -1;
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if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
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line == 0xff || line == 0) {
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return -1;
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}
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pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
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line, pin);
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virq = irq_create_mapping(NULL, line);
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if (virq)
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irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
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} else {
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pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
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oirq.size, oirq.specifier[0], oirq.specifier[1],
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oirq.controller ? oirq.controller->full_name :
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"<default>");
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virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
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oirq.size);
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}
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if (!virq) {
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pr_debug(" Failed to map !\n");
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return -1;
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}
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pr_debug(" Mapped to linux irq %d\n", virq);
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pci_dev->irq = virq;
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return 0;
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}
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EXPORT_SYMBOL(pci_read_irq_line);
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/*
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* Platform support for /proc/bus/pci/X/Y mmap()s,
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* modelled on the sparc64 implementation by Dave Miller.
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* -- paulus.
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*/
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/*
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* Adjust vm_pgoff of VMA such that it is the physical page offset
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* corresponding to the 32-bit pci bus offset for DEV requested by the user.
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*
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* Basically, the user finds the base address for his device which he wishes
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* to mmap. They read the 32-bit value from the config space base register,
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* add whatever PAGE_SIZE multiple offset they wish, and feed this into the
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* offset parameter of mmap on /proc/bus/pci/XXX for that device.
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*
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* Returns negative error code on failure, zero on success.
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*/
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static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
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resource_size_t *offset,
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enum pci_mmap_state mmap_state)
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{
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struct pci_controller *hose = pci_bus_to_host(dev->bus);
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unsigned long io_offset = 0;
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int i, res_bit;
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if (hose == 0)
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return NULL; /* should never happen */
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/* If memory, add on the PCI bridge address offset */
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if (mmap_state == pci_mmap_mem) {
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#if 0 /* See comment in pci_resource_to_user() for why this is disabled */
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*offset += hose->pci_mem_offset;
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#endif
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res_bit = IORESOURCE_MEM;
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} else {
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io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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*offset += io_offset;
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res_bit = IORESOURCE_IO;
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}
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/*
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* Check that the offset requested corresponds to one of the
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* resources of the device.
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*/
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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struct resource *rp = &dev->resource[i];
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int flags = rp->flags;
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/* treat ROM as memory (should be already) */
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if (i == PCI_ROM_RESOURCE)
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flags |= IORESOURCE_MEM;
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/* Active and same type? */
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if ((flags & res_bit) == 0)
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continue;
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/* In the range of this resource? */
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if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
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continue;
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/* found it! construct the final physical address */
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if (mmap_state == pci_mmap_io)
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*offset += hose->io_base_phys - io_offset;
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return rp;
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}
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return NULL;
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}
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/*
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* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
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* device mapping.
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*/
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static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
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pgprot_t protection,
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enum pci_mmap_state mmap_state,
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int write_combine)
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{
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pgprot_t prot = protection;
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/* Write combine is always 0 on non-memory space mappings. On
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* memory space, if the user didn't pass 1, we check for a
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* "prefetchable" resource. This is a bit hackish, but we use
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* this to workaround the inability of /sysfs to provide a write
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* combine bit
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*/
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if (mmap_state != pci_mmap_mem)
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write_combine = 0;
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else if (write_combine == 0) {
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if (rp->flags & IORESOURCE_PREFETCH)
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write_combine = 1;
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}
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return pgprot_noncached(prot);
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}
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/*
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* This one is used by /dev/mem and fbdev who have no clue about the
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* PCI device, it tries to find the PCI device first and calls the
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* above routine
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*/
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pgprot_t pci_phys_mem_access_prot(struct file *file,
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unsigned long pfn,
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unsigned long size,
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pgprot_t prot)
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{
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struct pci_dev *pdev = NULL;
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struct resource *found = NULL;
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resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
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int i;
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if (page_is_ram(pfn))
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return prot;
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prot = pgprot_noncached(prot);
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for_each_pci_dev(pdev) {
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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struct resource *rp = &pdev->resource[i];
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int flags = rp->flags;
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/* Active and same type? */
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if ((flags & IORESOURCE_MEM) == 0)
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continue;
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/* In the range of this resource? */
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if (offset < (rp->start & PAGE_MASK) ||
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offset > rp->end)
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continue;
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found = rp;
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break;
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}
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if (found)
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break;
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}
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if (found) {
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if (found->flags & IORESOURCE_PREFETCH)
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prot = pgprot_noncached_wc(prot);
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pci_dev_put(pdev);
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}
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pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
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(unsigned long long)offset, pgprot_val(prot));
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return prot;
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}
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/*
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* Perform the actual remap of the pages for a PCI device mapping, as
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* appropriate for this architecture. The region in the process to map
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* is described by vm_start and vm_end members of VMA, the base physical
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* address is found in vm_pgoff.
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* The pci device structure is provided so that architectures may make mapping
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* decisions on a per-device or per-bus basis.
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*
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* Returns a negative error code on failure, zero on success.
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*/
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int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
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enum pci_mmap_state mmap_state, int write_combine)
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{
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resource_size_t offset =
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((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
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struct resource *rp;
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int ret;
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rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
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if (rp == NULL)
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return -EINVAL;
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vma->vm_pgoff = offset >> PAGE_SHIFT;
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vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
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vma->vm_page_prot,
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mmap_state, write_combine);
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ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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return ret;
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}
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/* This provides legacy IO read access on a bus */
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int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
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{
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unsigned long offset;
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struct pci_controller *hose = pci_bus_to_host(bus);
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struct resource *rp = &hose->io_resource;
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void __iomem *addr;
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/* Check if port can be supported by that bus. We only check
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* the ranges of the PHB though, not the bus itself as the rules
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* for forwarding legacy cycles down bridges are not our problem
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* here. So if the host bridge supports it, we do it.
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*/
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offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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offset += port;
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if (!(rp->flags & IORESOURCE_IO))
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return -ENXIO;
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if (offset < rp->start || (offset + size) > rp->end)
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return -ENXIO;
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addr = hose->io_base_virt + port;
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switch (size) {
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case 1:
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*((u8 *)val) = in_8(addr);
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return 1;
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case 2:
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if (port & 1)
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return -EINVAL;
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*((u16 *)val) = in_le16(addr);
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return 2;
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case 4:
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if (port & 3)
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return -EINVAL;
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*((u32 *)val) = in_le32(addr);
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return 4;
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}
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return -EINVAL;
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}
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|
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/* This provides legacy IO write access on a bus */
|
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int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
|
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{
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unsigned long offset;
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struct pci_controller *hose = pci_bus_to_host(bus);
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struct resource *rp = &hose->io_resource;
|
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void __iomem *addr;
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|
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/* Check if port can be supported by that bus. We only check
|
|
* the ranges of the PHB though, not the bus itself as the rules
|
|
* for forwarding legacy cycles down bridges are not our problem
|
|
* here. So if the host bridge supports it, we do it.
|
|
*/
|
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offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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offset += port;
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|
|
if (!(rp->flags & IORESOURCE_IO))
|
|
return -ENXIO;
|
|
if (offset < rp->start || (offset + size) > rp->end)
|
|
return -ENXIO;
|
|
addr = hose->io_base_virt + port;
|
|
|
|
/* WARNING: The generic code is idiotic. It gets passed a pointer
|
|
* to what can be a 1, 2 or 4 byte quantity and always reads that
|
|
* as a u32, which means that we have to correct the location of
|
|
* the data read within those 32 bits for size 1 and 2
|
|
*/
|
|
switch (size) {
|
|
case 1:
|
|
out_8(addr, val >> 24);
|
|
return 1;
|
|
case 2:
|
|
if (port & 1)
|
|
return -EINVAL;
|
|
out_le16(addr, val >> 16);
|
|
return 2;
|
|
case 4:
|
|
if (port & 3)
|
|
return -EINVAL;
|
|
out_le32(addr, val);
|
|
return 4;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* This provides legacy IO or memory mmap access on a bus */
|
|
int pci_mmap_legacy_page_range(struct pci_bus *bus,
|
|
struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(bus);
|
|
resource_size_t offset =
|
|
((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
|
|
resource_size_t size = vma->vm_end - vma->vm_start;
|
|
struct resource *rp;
|
|
|
|
pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
|
|
pci_domain_nr(bus), bus->number,
|
|
mmap_state == pci_mmap_mem ? "MEM" : "IO",
|
|
(unsigned long long)offset,
|
|
(unsigned long long)(offset + size - 1));
|
|
|
|
if (mmap_state == pci_mmap_mem) {
|
|
/* Hack alert !
|
|
*
|
|
* Because X is lame and can fail starting if it gets an error
|
|
* trying to mmap legacy_mem (instead of just moving on without
|
|
* legacy memory access) we fake it here by giving it anonymous
|
|
* memory, effectively behaving just like /dev/zero
|
|
*/
|
|
if ((offset + size) > hose->isa_mem_size) {
|
|
#ifdef CONFIG_MMU
|
|
printk(KERN_DEBUG
|
|
"Process %s (pid:%d) mapped non-existing PCI"
|
|
"legacy memory for 0%04x:%02x\n",
|
|
current->comm, current->pid, pci_domain_nr(bus),
|
|
bus->number);
|
|
#endif
|
|
if (vma->vm_flags & VM_SHARED)
|
|
return shmem_zero_setup(vma);
|
|
return 0;
|
|
}
|
|
offset += hose->isa_mem_phys;
|
|
} else {
|
|
unsigned long io_offset = (unsigned long)hose->io_base_virt - \
|
|
_IO_BASE;
|
|
unsigned long roffset = offset + io_offset;
|
|
rp = &hose->io_resource;
|
|
if (!(rp->flags & IORESOURCE_IO))
|
|
return -ENXIO;
|
|
if (roffset < rp->start || (roffset + size) > rp->end)
|
|
return -ENXIO;
|
|
offset += hose->io_base_phys;
|
|
}
|
|
pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
|
|
|
|
vma->vm_pgoff = offset >> PAGE_SHIFT;
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot);
|
|
}
|
|
|
|
void pci_resource_to_user(const struct pci_dev *dev, int bar,
|
|
const struct resource *rsrc,
|
|
resource_size_t *start, resource_size_t *end)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(dev->bus);
|
|
resource_size_t offset = 0;
|
|
|
|
if (hose == NULL)
|
|
return;
|
|
|
|
if (rsrc->flags & IORESOURCE_IO)
|
|
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
|
|
|
|
/* We pass a fully fixed up address to userland for MMIO instead of
|
|
* a BAR value because X is lame and expects to be able to use that
|
|
* to pass to /dev/mem !
|
|
*
|
|
* That means that we'll have potentially 64 bits values where some
|
|
* userland apps only expect 32 (like X itself since it thinks only
|
|
* Sparc has 64 bits MMIO) but if we don't do that, we break it on
|
|
* 32 bits CHRPs :-(
|
|
*
|
|
* Hopefully, the sysfs insterface is immune to that gunk. Once X
|
|
* has been fixed (and the fix spread enough), we can re-enable the
|
|
* 2 lines below and pass down a BAR value to userland. In that case
|
|
* we'll also have to re-enable the matching code in
|
|
* __pci_mmap_make_offset().
|
|
*
|
|
* BenH.
|
|
*/
|
|
#if 0
|
|
else if (rsrc->flags & IORESOURCE_MEM)
|
|
offset = hose->pci_mem_offset;
|
|
#endif
|
|
|
|
*start = rsrc->start - offset;
|
|
*end = rsrc->end - offset;
|
|
}
|
|
|
|
/**
|
|
* pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
|
|
* @hose: newly allocated pci_controller to be setup
|
|
* @dev: device node of the host bridge
|
|
* @primary: set if primary bus (32 bits only, soon to be deprecated)
|
|
*
|
|
* This function will parse the "ranges" property of a PCI host bridge device
|
|
* node and setup the resource mapping of a pci controller based on its
|
|
* content.
|
|
*
|
|
* Life would be boring if it wasn't for a few issues that we have to deal
|
|
* with here:
|
|
*
|
|
* - We can only cope with one IO space range and up to 3 Memory space
|
|
* ranges. However, some machines (thanks Apple !) tend to split their
|
|
* space into lots of small contiguous ranges. So we have to coalesce.
|
|
*
|
|
* - We can only cope with all memory ranges having the same offset
|
|
* between CPU addresses and PCI addresses. Unfortunately, some bridges
|
|
* are setup for a large 1:1 mapping along with a small "window" which
|
|
* maps PCI address 0 to some arbitrary high address of the CPU space in
|
|
* order to give access to the ISA memory hole.
|
|
* The way out of here that I've chosen for now is to always set the
|
|
* offset based on the first resource found, then override it if we
|
|
* have a different offset and the previous was set by an ISA hole.
|
|
*
|
|
* - Some busses have IO space not starting at 0, which causes trouble with
|
|
* the way we do our IO resource renumbering. The code somewhat deals with
|
|
* it for 64 bits but I would expect problems on 32 bits.
|
|
*
|
|
* - Some 32 bits platforms such as 4xx can have physical space larger than
|
|
* 32 bits so we need to use 64 bits values for the parsing
|
|
*/
|
|
void __devinit pci_process_bridge_OF_ranges(struct pci_controller *hose,
|
|
struct device_node *dev,
|
|
int primary)
|
|
{
|
|
const u32 *ranges;
|
|
int rlen;
|
|
int pna = of_n_addr_cells(dev);
|
|
int np = pna + 5;
|
|
int memno = 0, isa_hole = -1;
|
|
u32 pci_space;
|
|
unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size;
|
|
unsigned long long isa_mb = 0;
|
|
struct resource *res;
|
|
|
|
printk(KERN_INFO "PCI host bridge %s %s ranges:\n",
|
|
dev->full_name, primary ? "(primary)" : "");
|
|
|
|
/* Get ranges property */
|
|
ranges = of_get_property(dev, "ranges", &rlen);
|
|
if (ranges == NULL)
|
|
return;
|
|
|
|
/* Parse it */
|
|
pr_debug("Parsing ranges property...\n");
|
|
while ((rlen -= np * 4) >= 0) {
|
|
/* Read next ranges element */
|
|
pci_space = ranges[0];
|
|
pci_addr = of_read_number(ranges + 1, 2);
|
|
cpu_addr = of_translate_address(dev, ranges + 3);
|
|
size = of_read_number(ranges + pna + 3, 2);
|
|
|
|
pr_debug("pci_space: 0x%08x pci_addr:0x%016llx "
|
|
"cpu_addr:0x%016llx size:0x%016llx\n",
|
|
pci_space, pci_addr, cpu_addr, size);
|
|
|
|
ranges += np;
|
|
|
|
/* If we failed translation or got a zero-sized region
|
|
* (some FW try to feed us with non sensical zero sized regions
|
|
* such as power3 which look like some kind of attempt
|
|
* at exposing the VGA memory hole)
|
|
*/
|
|
if (cpu_addr == OF_BAD_ADDR || size == 0)
|
|
continue;
|
|
|
|
/* Now consume following elements while they are contiguous */
|
|
for (; rlen >= np * sizeof(u32);
|
|
ranges += np, rlen -= np * 4) {
|
|
if (ranges[0] != pci_space)
|
|
break;
|
|
pci_next = of_read_number(ranges + 1, 2);
|
|
cpu_next = of_translate_address(dev, ranges + 3);
|
|
if (pci_next != pci_addr + size ||
|
|
cpu_next != cpu_addr + size)
|
|
break;
|
|
size += of_read_number(ranges + pna + 3, 2);
|
|
}
|
|
|
|
/* Act based on address space type */
|
|
res = NULL;
|
|
switch ((pci_space >> 24) & 0x3) {
|
|
case 1: /* PCI IO space */
|
|
printk(KERN_INFO
|
|
" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
|
|
cpu_addr, cpu_addr + size - 1, pci_addr);
|
|
|
|
/* We support only one IO range */
|
|
if (hose->pci_io_size) {
|
|
printk(KERN_INFO
|
|
" \\--> Skipped (too many) !\n");
|
|
continue;
|
|
}
|
|
/* On 32 bits, limit I/O space to 16MB */
|
|
if (size > 0x01000000)
|
|
size = 0x01000000;
|
|
|
|
/* 32 bits needs to map IOs here */
|
|
hose->io_base_virt = ioremap(cpu_addr, size);
|
|
|
|
/* Expect trouble if pci_addr is not 0 */
|
|
if (primary)
|
|
isa_io_base =
|
|
(unsigned long)hose->io_base_virt;
|
|
/* pci_io_size and io_base_phys always represent IO
|
|
* space starting at 0 so we factor in pci_addr
|
|
*/
|
|
hose->pci_io_size = pci_addr + size;
|
|
hose->io_base_phys = cpu_addr - pci_addr;
|
|
|
|
/* Build resource */
|
|
res = &hose->io_resource;
|
|
res->flags = IORESOURCE_IO;
|
|
res->start = pci_addr;
|
|
break;
|
|
case 2: /* PCI Memory space */
|
|
case 3: /* PCI 64 bits Memory space */
|
|
printk(KERN_INFO
|
|
" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
|
|
cpu_addr, cpu_addr + size - 1, pci_addr,
|
|
(pci_space & 0x40000000) ? "Prefetch" : "");
|
|
|
|
/* We support only 3 memory ranges */
|
|
if (memno >= 3) {
|
|
printk(KERN_INFO
|
|
" \\--> Skipped (too many) !\n");
|
|
continue;
|
|
}
|
|
/* Handles ISA memory hole space here */
|
|
if (pci_addr == 0) {
|
|
isa_mb = cpu_addr;
|
|
isa_hole = memno;
|
|
if (primary || isa_mem_base == 0)
|
|
isa_mem_base = cpu_addr;
|
|
hose->isa_mem_phys = cpu_addr;
|
|
hose->isa_mem_size = size;
|
|
}
|
|
|
|
/* We get the PCI/Mem offset from the first range or
|
|
* the, current one if the offset came from an ISA
|
|
* hole. If they don't match, bugger.
|
|
*/
|
|
if (memno == 0 ||
|
|
(isa_hole >= 0 && pci_addr != 0 &&
|
|
hose->pci_mem_offset == isa_mb))
|
|
hose->pci_mem_offset = cpu_addr - pci_addr;
|
|
else if (pci_addr != 0 &&
|
|
hose->pci_mem_offset != cpu_addr - pci_addr) {
|
|
printk(KERN_INFO
|
|
" \\--> Skipped (offset mismatch) !\n");
|
|
continue;
|
|
}
|
|
|
|
/* Build resource */
|
|
res = &hose->mem_resources[memno++];
|
|
res->flags = IORESOURCE_MEM;
|
|
if (pci_space & 0x40000000)
|
|
res->flags |= IORESOURCE_PREFETCH;
|
|
res->start = cpu_addr;
|
|
break;
|
|
}
|
|
if (res != NULL) {
|
|
res->name = dev->full_name;
|
|
res->end = res->start + size - 1;
|
|
res->parent = NULL;
|
|
res->sibling = NULL;
|
|
res->child = NULL;
|
|
}
|
|
}
|
|
|
|
/* If there's an ISA hole and the pci_mem_offset is -not- matching
|
|
* the ISA hole offset, then we need to remove the ISA hole from
|
|
* the resource list for that brige
|
|
*/
|
|
if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) {
|
|
unsigned int next = isa_hole + 1;
|
|
printk(KERN_INFO " Removing ISA hole at 0x%016llx\n", isa_mb);
|
|
if (next < memno)
|
|
memmove(&hose->mem_resources[isa_hole],
|
|
&hose->mem_resources[next],
|
|
sizeof(struct resource) * (memno - next));
|
|
hose->mem_resources[--memno].flags = 0;
|
|
}
|
|
}
|
|
|
|
/* Decide whether to display the domain number in /proc */
|
|
int pci_proc_domain(struct pci_bus *bus)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This header fixup will do the resource fixup for all devices as they are
|
|
* probed, but not for bridge ranges
|
|
*/
|
|
static void __devinit pcibios_fixup_resources(struct pci_dev *dev)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(dev->bus);
|
|
int i;
|
|
|
|
if (!hose) {
|
|
printk(KERN_ERR "No host bridge for PCI dev %s !\n",
|
|
pci_name(dev));
|
|
return;
|
|
}
|
|
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
|
|
struct resource *res = dev->resource + i;
|
|
if (!res->flags)
|
|
continue;
|
|
if (res->start == 0) {
|
|
pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]" \
|
|
"is unassigned\n",
|
|
pci_name(dev), i,
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end,
|
|
(unsigned int)res->flags);
|
|
res->end -= res->start;
|
|
res->start = 0;
|
|
res->flags |= IORESOURCE_UNSET;
|
|
continue;
|
|
}
|
|
|
|
pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]\n",
|
|
pci_name(dev), i,
|
|
(unsigned long long)res->start,\
|
|
(unsigned long long)res->end,
|
|
(unsigned int)res->flags);
|
|
}
|
|
}
|
|
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
|
|
|
|
/* This function tries to figure out if a bridge resource has been initialized
|
|
* by the firmware or not. It doesn't have to be absolutely bullet proof, but
|
|
* things go more smoothly when it gets it right. It should covers cases such
|
|
* as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
|
|
*/
|
|
static int __devinit pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
|
|
struct resource *res)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(bus);
|
|
struct pci_dev *dev = bus->self;
|
|
resource_size_t offset;
|
|
u16 command;
|
|
int i;
|
|
|
|
/* Job is a bit different between memory and IO */
|
|
if (res->flags & IORESOURCE_MEM) {
|
|
/* If the BAR is non-0 (res != pci_mem_offset) then it's
|
|
* probably been initialized by somebody
|
|
*/
|
|
if (res->start != hose->pci_mem_offset)
|
|
return 0;
|
|
|
|
/* The BAR is 0, let's check if memory decoding is enabled on
|
|
* the bridge. If not, we consider it unassigned
|
|
*/
|
|
pci_read_config_word(dev, PCI_COMMAND, &command);
|
|
if ((command & PCI_COMMAND_MEMORY) == 0)
|
|
return 1;
|
|
|
|
/* Memory decoding is enabled and the BAR is 0. If any of
|
|
* the bridge resources covers that starting address (0 then
|
|
* it's good enough for us for memory
|
|
*/
|
|
for (i = 0; i < 3; i++) {
|
|
if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
|
|
hose->mem_resources[i].start == hose->pci_mem_offset)
|
|
return 0;
|
|
}
|
|
|
|
/* Well, it starts at 0 and we know it will collide so we may as
|
|
* well consider it as unassigned. That covers the Apple case.
|
|
*/
|
|
return 1;
|
|
} else {
|
|
/* If the BAR is non-0, then we consider it assigned */
|
|
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
|
|
if (((res->start - offset) & 0xfffffffful) != 0)
|
|
return 0;
|
|
|
|
/* Here, we are a bit different than memory as typically IO
|
|
* space starting at low addresses -is- valid. What we do
|
|
* instead if that we consider as unassigned anything that
|
|
* doesn't have IO enabled in the PCI command register,
|
|
* and that's it.
|
|
*/
|
|
pci_read_config_word(dev, PCI_COMMAND, &command);
|
|
if (command & PCI_COMMAND_IO)
|
|
return 0;
|
|
|
|
/* It's starting at 0 and IO is disabled in the bridge, consider
|
|
* it unassigned
|
|
*/
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Fixup resources of a PCI<->PCI bridge */
|
|
static void __devinit pcibios_fixup_bridge(struct pci_bus *bus)
|
|
{
|
|
struct resource *res;
|
|
int i;
|
|
|
|
struct pci_dev *dev = bus->self;
|
|
|
|
pci_bus_for_each_resource(bus, res, i) {
|
|
if (!res)
|
|
continue;
|
|
if (!res->flags)
|
|
continue;
|
|
if (i >= 3 && bus->self->transparent)
|
|
continue;
|
|
|
|
pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",
|
|
pci_name(dev), i,
|
|
(unsigned long long)res->start,\
|
|
(unsigned long long)res->end,
|
|
(unsigned int)res->flags);
|
|
|
|
/* Try to detect uninitialized P2P bridge resources,
|
|
* and clear them out so they get re-assigned later
|
|
*/
|
|
if (pcibios_uninitialized_bridge_resource(bus, res)) {
|
|
res->flags = 0;
|
|
pr_debug("PCI:%s (unassigned)\n",
|
|
pci_name(dev));
|
|
} else {
|
|
pr_debug("PCI:%s %016llx-%016llx\n",
|
|
pci_name(dev),
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __devinit pcibios_setup_bus_self(struct pci_bus *bus)
|
|
{
|
|
/* Fix up the bus resources for P2P bridges */
|
|
if (bus->self != NULL)
|
|
pcibios_fixup_bridge(bus);
|
|
}
|
|
|
|
void __devinit pcibios_setup_bus_devices(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
pr_debug("PCI: Fixup bus devices %d (%s)\n",
|
|
bus->number, bus->self ? pci_name(bus->self) : "PHB");
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/* Setup OF node pointer in archdata */
|
|
dev->dev.of_node = pci_device_to_OF_node(dev);
|
|
|
|
/* Fixup NUMA node as it may not be setup yet by the generic
|
|
* code and is needed by the DMA init
|
|
*/
|
|
set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
|
|
|
|
/* Hook up default DMA ops */
|
|
set_dma_ops(&dev->dev, pci_dma_ops);
|
|
dev->dev.archdata.dma_data = (void *)PCI_DRAM_OFFSET;
|
|
|
|
/* Read default IRQs and fixup if necessary */
|
|
pci_read_irq_line(dev);
|
|
}
|
|
}
|
|
|
|
void __devinit pcibios_fixup_bus(struct pci_bus *bus)
|
|
{
|
|
/* When called from the generic PCI probe, read PCI<->PCI bridge
|
|
* bases. This is -not- called when generating the PCI tree from
|
|
* the OF device-tree.
|
|
*/
|
|
if (bus->self != NULL)
|
|
pci_read_bridge_bases(bus);
|
|
|
|
/* Now fixup the bus bus */
|
|
pcibios_setup_bus_self(bus);
|
|
|
|
/* Now fixup devices on that bus */
|
|
pcibios_setup_bus_devices(bus);
|
|
}
|
|
EXPORT_SYMBOL(pcibios_fixup_bus);
|
|
|
|
static int skip_isa_ioresource_align(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We need to avoid collisions with `mirrored' VGA ports
|
|
* and other strange ISA hardware, so we always want the
|
|
* addresses to be allocated in the 0x000-0x0ff region
|
|
* modulo 0x400.
|
|
*
|
|
* Why? Because some silly external IO cards only decode
|
|
* the low 10 bits of the IO address. The 0x00-0xff region
|
|
* is reserved for motherboard devices that decode all 16
|
|
* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
|
|
* but we want to try to avoid allocating at 0x2900-0x2bff
|
|
* which might have be mirrored at 0x0100-0x03ff..
|
|
*/
|
|
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
|
|
resource_size_t size, resource_size_t align)
|
|
{
|
|
struct pci_dev *dev = data;
|
|
resource_size_t start = res->start;
|
|
|
|
if (res->flags & IORESOURCE_IO) {
|
|
if (skip_isa_ioresource_align(dev))
|
|
return start;
|
|
if (start & 0x300)
|
|
start = (start + 0x3ff) & ~0x3ff;
|
|
}
|
|
|
|
return start;
|
|
}
|
|
EXPORT_SYMBOL(pcibios_align_resource);
|
|
|
|
/*
|
|
* Reparent resource children of pr that conflict with res
|
|
* under res, and make res replace those children.
|
|
*/
|
|
static int __init reparent_resources(struct resource *parent,
|
|
struct resource *res)
|
|
{
|
|
struct resource *p, **pp;
|
|
struct resource **firstpp = NULL;
|
|
|
|
for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
|
|
if (p->end < res->start)
|
|
continue;
|
|
if (res->end < p->start)
|
|
break;
|
|
if (p->start < res->start || p->end > res->end)
|
|
return -1; /* not completely contained */
|
|
if (firstpp == NULL)
|
|
firstpp = pp;
|
|
}
|
|
if (firstpp == NULL)
|
|
return -1; /* didn't find any conflicting entries? */
|
|
res->parent = parent;
|
|
res->child = *firstpp;
|
|
res->sibling = *pp;
|
|
*firstpp = res;
|
|
*pp = NULL;
|
|
for (p = res->child; p != NULL; p = p->sibling) {
|
|
p->parent = res;
|
|
pr_debug("PCI: Reparented %s [%llx..%llx] under %s\n",
|
|
p->name,
|
|
(unsigned long long)p->start,
|
|
(unsigned long long)p->end, res->name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle resources of PCI devices. If the world were perfect, we could
|
|
* just allocate all the resource regions and do nothing more. It isn't.
|
|
* On the other hand, we cannot just re-allocate all devices, as it would
|
|
* require us to know lots of host bridge internals. So we attempt to
|
|
* keep as much of the original configuration as possible, but tweak it
|
|
* when it's found to be wrong.
|
|
*
|
|
* Known BIOS problems we have to work around:
|
|
* - I/O or memory regions not configured
|
|
* - regions configured, but not enabled in the command register
|
|
* - bogus I/O addresses above 64K used
|
|
* - expansion ROMs left enabled (this may sound harmless, but given
|
|
* the fact the PCI specs explicitly allow address decoders to be
|
|
* shared between expansion ROMs and other resource regions, it's
|
|
* at least dangerous)
|
|
*
|
|
* Our solution:
|
|
* (1) Allocate resources for all buses behind PCI-to-PCI bridges.
|
|
* This gives us fixed barriers on where we can allocate.
|
|
* (2) Allocate resources for all enabled devices. If there is
|
|
* a collision, just mark the resource as unallocated. Also
|
|
* disable expansion ROMs during this step.
|
|
* (3) Try to allocate resources for disabled devices. If the
|
|
* resources were assigned correctly, everything goes well,
|
|
* if they weren't, they won't disturb allocation of other
|
|
* resources.
|
|
* (4) Assign new addresses to resources which were either
|
|
* not configured at all or misconfigured. If explicitly
|
|
* requested by the user, configure expansion ROM address
|
|
* as well.
|
|
*/
|
|
|
|
void pcibios_allocate_bus_resources(struct pci_bus *bus)
|
|
{
|
|
struct pci_bus *b;
|
|
int i;
|
|
struct resource *res, *pr;
|
|
|
|
pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
|
|
pci_domain_nr(bus), bus->number);
|
|
|
|
pci_bus_for_each_resource(bus, res, i) {
|
|
if (!res || !res->flags
|
|
|| res->start > res->end || res->parent)
|
|
continue;
|
|
if (bus->parent == NULL)
|
|
pr = (res->flags & IORESOURCE_IO) ?
|
|
&ioport_resource : &iomem_resource;
|
|
else {
|
|
/* Don't bother with non-root busses when
|
|
* re-assigning all resources. We clear the
|
|
* resource flags as if they were colliding
|
|
* and as such ensure proper re-allocation
|
|
* later.
|
|
*/
|
|
pr = pci_find_parent_resource(bus->self, res);
|
|
if (pr == res) {
|
|
/* this happens when the generic PCI
|
|
* code (wrongly) decides that this
|
|
* bridge is transparent -- paulus
|
|
*/
|
|
continue;
|
|
}
|
|
}
|
|
|
|
pr_debug("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx "
|
|
"[0x%x], parent %p (%s)\n",
|
|
bus->self ? pci_name(bus->self) : "PHB",
|
|
bus->number, i,
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end,
|
|
(unsigned int)res->flags,
|
|
pr, (pr && pr->name) ? pr->name : "nil");
|
|
|
|
if (pr && !(pr->flags & IORESOURCE_UNSET)) {
|
|
if (request_resource(pr, res) == 0)
|
|
continue;
|
|
/*
|
|
* Must be a conflict with an existing entry.
|
|
* Move that entry (or entries) under the
|
|
* bridge resource and try again.
|
|
*/
|
|
if (reparent_resources(pr, res) == 0)
|
|
continue;
|
|
}
|
|
printk(KERN_WARNING "PCI: Cannot allocate resource region "
|
|
"%d of PCI bridge %d, will remap\n", i, bus->number);
|
|
clear_resource:
|
|
res->start = res->end = 0;
|
|
res->flags = 0;
|
|
}
|
|
|
|
list_for_each_entry(b, &bus->children, node)
|
|
pcibios_allocate_bus_resources(b);
|
|
}
|
|
|
|
static inline void __devinit alloc_resource(struct pci_dev *dev, int idx)
|
|
{
|
|
struct resource *pr, *r = &dev->resource[idx];
|
|
|
|
pr_debug("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n",
|
|
pci_name(dev), idx,
|
|
(unsigned long long)r->start,
|
|
(unsigned long long)r->end,
|
|
(unsigned int)r->flags);
|
|
|
|
pr = pci_find_parent_resource(dev, r);
|
|
if (!pr || (pr->flags & IORESOURCE_UNSET) ||
|
|
request_resource(pr, r) < 0) {
|
|
printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
|
|
" of device %s, will remap\n", idx, pci_name(dev));
|
|
if (pr)
|
|
pr_debug("PCI: parent is %p: %016llx-%016llx [%x]\n",
|
|
pr,
|
|
(unsigned long long)pr->start,
|
|
(unsigned long long)pr->end,
|
|
(unsigned int)pr->flags);
|
|
/* We'll assign a new address later */
|
|
r->flags |= IORESOURCE_UNSET;
|
|
r->end -= r->start;
|
|
r->start = 0;
|
|
}
|
|
}
|
|
|
|
static void __init pcibios_allocate_resources(int pass)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
int idx, disabled;
|
|
u16 command;
|
|
struct resource *r;
|
|
|
|
for_each_pci_dev(dev) {
|
|
pci_read_config_word(dev, PCI_COMMAND, &command);
|
|
for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
|
|
r = &dev->resource[idx];
|
|
if (r->parent) /* Already allocated */
|
|
continue;
|
|
if (!r->flags || (r->flags & IORESOURCE_UNSET))
|
|
continue; /* Not assigned at all */
|
|
/* We only allocate ROMs on pass 1 just in case they
|
|
* have been screwed up by firmware
|
|
*/
|
|
if (idx == PCI_ROM_RESOURCE)
|
|
disabled = 1;
|
|
if (r->flags & IORESOURCE_IO)
|
|
disabled = !(command & PCI_COMMAND_IO);
|
|
else
|
|
disabled = !(command & PCI_COMMAND_MEMORY);
|
|
if (pass == disabled)
|
|
alloc_resource(dev, idx);
|
|
}
|
|
if (pass)
|
|
continue;
|
|
r = &dev->resource[PCI_ROM_RESOURCE];
|
|
if (r->flags) {
|
|
/* Turn the ROM off, leave the resource region,
|
|
* but keep it unregistered.
|
|
*/
|
|
u32 reg;
|
|
pci_read_config_dword(dev, dev->rom_base_reg, ®);
|
|
if (reg & PCI_ROM_ADDRESS_ENABLE) {
|
|
pr_debug("PCI: Switching off ROM of %s\n",
|
|
pci_name(dev));
|
|
r->flags &= ~IORESOURCE_ROM_ENABLE;
|
|
pci_write_config_dword(dev, dev->rom_base_reg,
|
|
reg & ~PCI_ROM_ADDRESS_ENABLE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
|
|
{
|
|
struct pci_controller *hose = pci_bus_to_host(bus);
|
|
resource_size_t offset;
|
|
struct resource *res, *pres;
|
|
int i;
|
|
|
|
pr_debug("Reserving legacy ranges for domain %04x\n",
|
|
pci_domain_nr(bus));
|
|
|
|
/* Check for IO */
|
|
if (!(hose->io_resource.flags & IORESOURCE_IO))
|
|
goto no_io;
|
|
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
|
|
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
|
|
BUG_ON(res == NULL);
|
|
res->name = "Legacy IO";
|
|
res->flags = IORESOURCE_IO;
|
|
res->start = offset;
|
|
res->end = (offset + 0xfff) & 0xfffffffful;
|
|
pr_debug("Candidate legacy IO: %pR\n", res);
|
|
if (request_resource(&hose->io_resource, res)) {
|
|
printk(KERN_DEBUG
|
|
"PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
|
|
pci_domain_nr(bus), bus->number, res);
|
|
kfree(res);
|
|
}
|
|
|
|
no_io:
|
|
/* Check for memory */
|
|
offset = hose->pci_mem_offset;
|
|
pr_debug("hose mem offset: %016llx\n", (unsigned long long)offset);
|
|
for (i = 0; i < 3; i++) {
|
|
pres = &hose->mem_resources[i];
|
|
if (!(pres->flags & IORESOURCE_MEM))
|
|
continue;
|
|
pr_debug("hose mem res: %pR\n", pres);
|
|
if ((pres->start - offset) <= 0xa0000 &&
|
|
(pres->end - offset) >= 0xbffff)
|
|
break;
|
|
}
|
|
if (i >= 3)
|
|
return;
|
|
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
|
|
BUG_ON(res == NULL);
|
|
res->name = "Legacy VGA memory";
|
|
res->flags = IORESOURCE_MEM;
|
|
res->start = 0xa0000 + offset;
|
|
res->end = 0xbffff + offset;
|
|
pr_debug("Candidate VGA memory: %pR\n", res);
|
|
if (request_resource(pres, res)) {
|
|
printk(KERN_DEBUG
|
|
"PCI %04x:%02x Cannot reserve VGA memory %pR\n",
|
|
pci_domain_nr(bus), bus->number, res);
|
|
kfree(res);
|
|
}
|
|
}
|
|
|
|
void __init pcibios_resource_survey(void)
|
|
{
|
|
struct pci_bus *b;
|
|
|
|
/* Allocate and assign resources. If we re-assign everything, then
|
|
* we skip the allocate phase
|
|
*/
|
|
list_for_each_entry(b, &pci_root_buses, node)
|
|
pcibios_allocate_bus_resources(b);
|
|
|
|
pcibios_allocate_resources(0);
|
|
pcibios_allocate_resources(1);
|
|
|
|
/* Before we start assigning unassigned resource, we try to reserve
|
|
* the low IO area and the VGA memory area if they intersect the
|
|
* bus available resources to avoid allocating things on top of them
|
|
*/
|
|
list_for_each_entry(b, &pci_root_buses, node)
|
|
pcibios_reserve_legacy_regions(b);
|
|
|
|
/* Now proceed to assigning things that were left unassigned */
|
|
pr_debug("PCI: Assigning unassigned resources...\n");
|
|
pci_assign_unassigned_resources();
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
|
|
/* This is used by the PCI hotplug driver to allocate resource
|
|
* of newly plugged busses. We can try to consolidate with the
|
|
* rest of the code later, for now, keep it as-is as our main
|
|
* resource allocation function doesn't deal with sub-trees yet.
|
|
*/
|
|
void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_bus *child_bus;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
if (r->parent || !r->start || !r->flags)
|
|
continue;
|
|
|
|
pr_debug("PCI: Claiming %s: "
|
|
"Resource %d: %016llx..%016llx [%x]\n",
|
|
pci_name(dev), i,
|
|
(unsigned long long)r->start,
|
|
(unsigned long long)r->end,
|
|
(unsigned int)r->flags);
|
|
|
|
pci_claim_resource(dev, i);
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(child_bus, &bus->children, node)
|
|
pcibios_claim_one_bus(child_bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
|
|
|
|
|
|
/* pcibios_finish_adding_to_bus
|
|
*
|
|
* This is to be called by the hotplug code after devices have been
|
|
* added to a bus, this include calling it for a PHB that is just
|
|
* being added
|
|
*/
|
|
void pcibios_finish_adding_to_bus(struct pci_bus *bus)
|
|
{
|
|
pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
|
|
pci_domain_nr(bus), bus->number);
|
|
|
|
/* Allocate bus and devices resources */
|
|
pcibios_allocate_bus_resources(bus);
|
|
pcibios_claim_one_bus(bus);
|
|
|
|
/* Add new devices to global lists. Register in proc, sysfs. */
|
|
pci_bus_add_devices(bus);
|
|
|
|
/* Fixup EEH */
|
|
/* eeh_add_device_tree_late(bus); */
|
|
}
|
|
EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
|
|
|
|
#endif /* CONFIG_HOTPLUG */
|
|
|
|
int pcibios_enable_device(struct pci_dev *dev, int mask)
|
|
{
|
|
return pci_enable_resources(dev, mask);
|
|
}
|
|
|
|
static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose, struct list_head *resources)
|
|
{
|
|
struct resource *res;
|
|
int i;
|
|
|
|
/* Hookup PHB IO resource */
|
|
res = &hose->io_resource;
|
|
|
|
/* Fixup IO space offset */
|
|
io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
|
|
res->start = (res->start + io_offset) & 0xffffffffu;
|
|
res->end = (res->end + io_offset) & 0xffffffffu;
|
|
|
|
if (!res->flags) {
|
|
printk(KERN_WARNING "PCI: I/O resource not set for host"
|
|
" bridge %s (domain %d)\n",
|
|
hose->dn->full_name, hose->global_number);
|
|
/* Workaround for lack of IO resource only on 32-bit */
|
|
res->start = (unsigned long)hose->io_base_virt - isa_io_base;
|
|
res->end = res->start + IO_SPACE_LIMIT;
|
|
res->flags = IORESOURCE_IO;
|
|
}
|
|
pci_add_resource_offset(resources, res, hose->io_base_virt - _IO_BASE);
|
|
|
|
pr_debug("PCI: PHB IO resource = %016llx-%016llx [%lx]\n",
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end,
|
|
(unsigned long)res->flags);
|
|
|
|
/* Hookup PHB Memory resources */
|
|
for (i = 0; i < 3; ++i) {
|
|
res = &hose->mem_resources[i];
|
|
if (!res->flags) {
|
|
if (i > 0)
|
|
continue;
|
|
printk(KERN_ERR "PCI: Memory resource 0 not set for "
|
|
"host bridge %s (domain %d)\n",
|
|
hose->dn->full_name, hose->global_number);
|
|
|
|
/* Workaround for lack of MEM resource only on 32-bit */
|
|
res->start = hose->pci_mem_offset;
|
|
res->end = (resource_size_t)-1LL;
|
|
res->flags = IORESOURCE_MEM;
|
|
|
|
}
|
|
pci_add_resource_offset(resources, res, hose->pci_mem_offset);
|
|
|
|
pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n",
|
|
i, (unsigned long long)res->start,
|
|
(unsigned long long)res->end,
|
|
(unsigned long)res->flags);
|
|
}
|
|
|
|
pr_debug("PCI: PHB MEM offset = %016llx\n",
|
|
(unsigned long long)hose->pci_mem_offset);
|
|
pr_debug("PCI: PHB IO offset = %08lx\n",
|
|
(unsigned long)hose->io_base_virt - _IO_BASE);
|
|
}
|
|
|
|
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
|
|
{
|
|
struct pci_controller *hose = bus->sysdata;
|
|
|
|
return of_node_get(hose->dn);
|
|
}
|
|
|
|
static void __devinit pcibios_scan_phb(struct pci_controller *hose)
|
|
{
|
|
LIST_HEAD(resources);
|
|
struct pci_bus *bus;
|
|
struct device_node *node = hose->dn;
|
|
|
|
pr_debug("PCI: Scanning PHB %s\n",
|
|
node ? node->full_name : "<NO NAME>");
|
|
|
|
pcibios_setup_phb_resources(hose, &resources);
|
|
|
|
bus = pci_scan_root_bus(hose->parent, hose->first_busno,
|
|
hose->ops, hose, &resources);
|
|
if (bus == NULL) {
|
|
printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
|
|
hose->global_number);
|
|
pci_free_resource_list(&resources);
|
|
return;
|
|
}
|
|
bus->secondary = hose->first_busno;
|
|
hose->bus = bus;
|
|
|
|
hose->last_busno = bus->subordinate;
|
|
}
|
|
|
|
static int __init pcibios_init(void)
|
|
{
|
|
struct pci_controller *hose, *tmp;
|
|
int next_busno = 0;
|
|
|
|
printk(KERN_INFO "PCI: Probing PCI hardware\n");
|
|
|
|
/* Scan all of the recorded PCI controllers. */
|
|
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
|
|
hose->last_busno = 0xff;
|
|
pcibios_scan_phb(hose);
|
|
if (next_busno <= hose->last_busno)
|
|
next_busno = hose->last_busno + 1;
|
|
}
|
|
pci_bus_count = next_busno;
|
|
|
|
/* Call common code to handle resource allocation */
|
|
pcibios_resource_survey();
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(pcibios_init);
|
|
|
|
static struct pci_controller *pci_bus_to_hose(int bus)
|
|
{
|
|
struct pci_controller *hose, *tmp;
|
|
|
|
list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
|
|
if (bus >= hose->first_busno && bus <= hose->last_busno)
|
|
return hose;
|
|
return NULL;
|
|
}
|
|
|
|
/* Provide information on locations of various I/O regions in physical
|
|
* memory. Do this on a per-card basis so that we choose the right
|
|
* root bridge.
|
|
* Note that the returned IO or memory base is a physical address
|
|
*/
|
|
|
|
long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
|
|
{
|
|
struct pci_controller *hose;
|
|
long result = -EOPNOTSUPP;
|
|
|
|
hose = pci_bus_to_hose(bus);
|
|
if (!hose)
|
|
return -ENODEV;
|
|
|
|
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 (long)isa_mem_base;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Null PCI config access functions, for the case when we can't
|
|
* find a hose.
|
|
*/
|
|
#define NULL_PCI_OP(rw, size, type) \
|
|
static int \
|
|
null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
|
|
{ \
|
|
return PCIBIOS_DEVICE_NOT_FOUND; \
|
|
}
|
|
|
|
static int
|
|
null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
|
|
int len, u32 *val)
|
|
{
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
}
|
|
|
|
static int
|
|
null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
|
|
int len, u32 val)
|
|
{
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
}
|
|
|
|
static struct pci_ops null_pci_ops = {
|
|
.read = null_read_config,
|
|
.write = null_write_config,
|
|
};
|
|
|
|
/*
|
|
* These functions are used early on before PCI scanning is done
|
|
* and all of the pci_dev and pci_bus structures have been created.
|
|
*/
|
|
static struct pci_bus *
|
|
fake_pci_bus(struct pci_controller *hose, int busnr)
|
|
{
|
|
static struct pci_bus bus;
|
|
|
|
if (!hose)
|
|
printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
|
|
|
|
bus.number = busnr;
|
|
bus.sysdata = hose;
|
|
bus.ops = hose ? hose->ops : &null_pci_ops;
|
|
return &bus;
|
|
}
|
|
|
|
#define EARLY_PCI_OP(rw, size, type) \
|
|
int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
|
|
int devfn, int offset, type value) \
|
|
{ \
|
|
return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \
|
|
devfn, offset, value); \
|
|
}
|
|
|
|
EARLY_PCI_OP(read, byte, u8 *)
|
|
EARLY_PCI_OP(read, word, u16 *)
|
|
EARLY_PCI_OP(read, dword, u32 *)
|
|
EARLY_PCI_OP(write, byte, u8)
|
|
EARLY_PCI_OP(write, word, u16)
|
|
EARLY_PCI_OP(write, dword, u32)
|
|
|
|
int early_find_capability(struct pci_controller *hose, int bus, int devfn,
|
|
int cap)
|
|
{
|
|
return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
|
|
}
|
|
|