LXR coreboot-v2/src/devices/pciexp

   1/*
   2 * This file is part of the coreboot project.
   3 *
   4 * Copyright (C) 2005 Linux Networx
   5 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; version 2 of the License.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19 */
  20
  21#include <console/console.h>
  22#include <device/device.h>
  23#include <device/pci.h>
  24#include <device/pci_ids.h>
  25#include <device/pciexp.h>
  26
  27
  28static void pciexp_tune_dev(device_t dev)
  29{
  30        unsigned cap;
  31
  32        cap = pci_find_capability(dev, PCI_CAP_ID_PCIE);
  33        if (!cap) {
  34                /* error... */
  35                return;
  36        }
  37        // printk_debug("PCIe: tuning %s\n", dev_path(dev));
  38        /* TODO: Implement PCI Express tuning. */
  39}
  40
  41unsigned int pciexp_scan_bus(struct bus *bus, 
  42        unsigned min_devfn, unsigned max_devfn, 
  43        unsigned int max)
  44{
  45        device_t child;
  46        max = pci_scan_bus(bus, min_devfn, max_devfn, max);
  47        for(child = bus->children; child; child = child->sibling) {
  48                if (    (child->path.pci.devfn < min_devfn) ||
  49                        (child->path.pci.devfn > max_devfn))
  50                {
  51                        continue;
  52                }
  53                pciexp_tune_dev(child);
  54        }
  55        return max;
  56}
  57
  58
  59unsigned int pciexp_scan_bridge(device_t dev, unsigned int max)
  60{
  61        return do_pci_scan_bridge(dev, max, pciexp_scan_bus);
  62}
  63
  64/** Default device operations for PCI Express bridges */
  65static struct pci_operations pciexp_bus_ops_pci = {
  66        .set_subsystem = 0,
  67};
  68
  69struct device_operations default_pciexp_ops_bus = {
  70        .read_resources   = pci_bus_read_resources,
  71        .set_resources    = pci_dev_set_resources,
  72        .enable_resources = pci_bus_enable_resources,
  73        .init             = 0,
  74        .scan_bus         = pciexp_scan_bridge,
  75        .enable           = 0,
  76        .reset_bus        = pci_bus_reset,
  77        .ops_pci          = &pciexp_bus_ops_pci,
  78};
  79