linux/drivers/eisa/pci_eisa.c
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   1/*
   2 * Minimalist driver for a generic PCI-to-EISA bridge.
   3 *
   4 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
   5 *
   6 * This code is released under the GPL version 2.
   7 *
   8 * Ivan Kokshaysky <ink@jurassic.park.msu.ru> :
   9 * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/device.h>
  14#include <linux/eisa.h>
  15#include <linux/pci.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18
  19/* There is only *one* pci_eisa device per machine, right ? */
  20static struct eisa_root_device pci_eisa_root;
  21
  22static int __init pci_eisa_init(struct pci_dev *pdev)
  23{
  24        int rc, i;
  25        struct resource *res, *bus_res = NULL;
  26
  27        if ((rc = pci_enable_device (pdev))) {
  28                printk (KERN_ERR "pci_eisa : Could not enable device %s\n",
  29                        pci_name(pdev));
  30                return rc;
  31        }
  32
  33        /*
  34         * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI
  35         * device, so the resources available on EISA are the same as those
  36         * available on the 82375 bus.  This works the same as a PCI-PCI
  37         * bridge in subtractive-decode mode (see pci_read_bridge_bases()).
  38         * We assume other PCI-EISA bridges are similar.
  39         *
  40         * eisa_root_register() can only deal with a single io port resource,
  41        *  so we use the first valid io port resource.
  42         */
  43        pci_bus_for_each_resource(pdev->bus, res, i)
  44                if (res && (res->flags & IORESOURCE_IO)) {
  45                        bus_res = res;
  46                        break;
  47                }
  48
  49        if (!bus_res) {
  50                dev_err(&pdev->dev, "No resources available\n");
  51                return -1;
  52        }
  53
  54        pci_eisa_root.dev              = &pdev->dev;
  55        pci_eisa_root.res              = bus_res;
  56        pci_eisa_root.bus_base_addr    = bus_res->start;
  57        pci_eisa_root.slots            = EISA_MAX_SLOTS;
  58        pci_eisa_root.dma_mask         = pdev->dma_mask;
  59        dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root);
  60
  61        if (eisa_root_register (&pci_eisa_root)) {
  62                printk (KERN_ERR "pci_eisa : Could not register EISA root\n");
  63                return -1;
  64        }
  65
  66        return 0;
  67}
  68
  69/*
  70 * We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init().
  71 *   Otherwise pnp resource will get enabled early and could prevent eisa
  72 *   to be initialized.
  73 * Also need to make sure pci_eisa_init_early() is called after
  74 * x86/pci_subsys_init().
  75 * So need to use subsys_initcall_sync with it.
  76 */
  77static int __init pci_eisa_init_early(void)
  78{
  79        struct pci_dev *dev = NULL;
  80        int ret;
  81
  82        for_each_pci_dev(dev)
  83                if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) {
  84                        ret = pci_eisa_init(dev);
  85                        if (ret)
  86                                return ret;
  87                }
  88
  89        return 0;
  90}
  91subsys_initcall_sync(pci_eisa_init_early);
  92
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