of_platform.c

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/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *           <benh@kernel.crashing.org>
 *    and        Arnd Bergmann, IBM Corp.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#undef DEBUG

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mod_devicetable.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/atomic.h>

#include <asm/errno.h>
#include <asm/topology.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/eeh.h>

#ifdef CONFIG_PPC_OF_PLATFORM_PCI

/* The probing of PCI controllers from of_platform is currently
 * 64 bits only, mostly due to gratuitous differences between
 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
 * lacking some bits needed here.
 */

static int __devinit of_pci_phb_probe(struct platform_device *dev)
{
    struct pci_controller *phb;

    /* Check if we can do that ... */
    if (ppc_md.pci_setup_phb == NULL)
        return -ENODEV;

    pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);

    /* Alloc and setup PHB data structure */
    phb = pcibios_alloc_controller(dev->dev.of_node);
    if (!phb)
        return -ENODEV;

    /* Setup parent in sysfs */
    phb->parent = &dev->dev;

    /* Setup the PHB using arch provided callback */
    if (ppc_md.pci_setup_phb(phb)) {
        pcibios_free_controller(phb);
        return -ENODEV;
    }

    /* Process "ranges" property */
    pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);

    /* Init pci_dn data structures */
    pci_devs_phb_init_dynamic(phb);

    /* Create EEH devices for the PHB */
    eeh_dev_phb_init_dynamic(phb);

    /* Register devices with EEH */
#ifdef CONFIG_EEH
    if (dev->dev.of_node->child)
        eeh_add_device_tree_early(dev->dev.of_node);
#endif /* CONFIG_EEH */

    /* Scan the bus */
    pcibios_scan_phb(phb);
    if (phb->bus == NULL)
        return -ENXIO;

    /* Claim resources. This might need some rework as well depending
     * wether we are doing probe-only or not, like assigning unassigned
     * resources etc...
     */
    pcibios_claim_one_bus(phb->bus);

    /* Finish EEH setup */
#ifdef CONFIG_EEH
    eeh_add_device_tree_late(phb->bus);
#endif

    /* Add probed PCI devices to the device model */
    pci_bus_add_devices(phb->bus);

    return 0;
}

static struct of_device_id of_pci_phb_ids[] = {
    { .type = "pci", },
    { .type = "pcix", },
    { .type = "pcie", },
    { .type = "pciex", },
    { .type = "ht", },
    {}
};

static struct platform_driver of_pci_phb_driver = {
    .probe = of_pci_phb_probe,
    .driver = {
        .name = "of-pci",
        .owner = THIS_MODULE,
        .of_match_table = of_pci_phb_ids,
    },
};

static __init int of_pci_phb_init(void)
{
    return platform_driver_register(&of_pci_phb_driver);
}

device_initcall(of_pci_phb_init);

#endif /* CONFIG_PPC_OF_PLATFORM_PCI */