linux-imx

/*

 * Minimalist driver for a generic PCI-to-EISA bridge.

 *

 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>

 *

 * This code is released under the GPL version 2.

 *

 * Ivan Kokshaysky <ink@jurassic.park.msu.ru> :

 * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA.

 */

​

#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/eisa.h>

#include <linux/pci.h>

#include <linux/module.h>

#include <linux/init.h>

​

/* There is only *one* pci_eisa device per machine, right ? */

static struct eisa_root_device pci_eisa_root;

​

static int __init pci_eisa_init(struct pci_dev *pdev)

{

    int rc, i;

    struct resource *res, *bus_res = NULL;

​

    if ((rc = pci_enable_device (pdev))) {

        dev_err(&pdev->dev, "Could not enable device\n");

        return rc;

    }

​

    /*

     * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI

     * device, so the resources available on EISA are the same as those

     * available on the 82375 bus.  This works the same as a PCI-PCI

     * bridge in subtractive-decode mode (see pci_read_bridge_bases()).

     * We assume other PCI-EISA bridges are similar.

     *

     * eisa_root_register() can only deal with a single io port resource,

    *  so we use the first valid io port resource.

     */

    pci_bus_for_each_resource(pdev->bus, res, i)

        if (res && (res->flags & IORESOURCE_IO)) {

            bus_res = res;

            break;

        }

​

    if (!bus_res) {

        dev_err(&pdev->dev, "No resources available\n");

        return -1;

    }

​

    pci_eisa_root.dev       = &pdev->dev;

    pci_eisa_root.res       = bus_res;

    pci_eisa_root.bus_base_addr = bus_res->start;

    pci_eisa_root.slots     = EISA_MAX_SLOTS;

    pci_eisa_root.dma_mask      = pdev->dma_mask;

    dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root);

​

    if (eisa_root_register (&pci_eisa_root)) {

        dev_err(&pdev->dev, "Could not register EISA root\n");

        return -1;

    }