linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * PCI detection and setup code

 */

​

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/of_device.h>

#include <linux/of_pci.h>

#include <linux/pci_hotplug.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/cpumask.h>

#include <linux/aer.h>

#include <linux/acpi.h>

#include <linux/hypervisor.h>

#include <linux/irqdomain.h>

#include <linux/pm_runtime.h>

#include "pci.h"

​

#define CARDBUS_LATENCY_TIMER   176 /* secondary latency timer */

#define CARDBUS_RESERVE_BUSNR   3

​

static struct resource busn_resource = {

    .name   = "PCI busn",

    .start  = 0,

    .end    = 255,

    .flags  = IORESOURCE_BUS,

};

​

/* Ugh.  Need to stop exporting this to modules. */

LIST_HEAD(pci_root_buses);

EXPORT_SYMBOL(pci_root_buses);

​

static LIST_HEAD(pci_domain_busn_res_list);

​

struct pci_domain_busn_res {

    struct list_head list;

    struct resource res;

    int domain_nr;

};

​

static struct resource *get_pci_domain_busn_res(int domain_nr)

{

    struct pci_domain_busn_res *r;

​

    list_for_each_entry(r, &pci_domain_busn_res_list, list)

        if (r->domain_nr == domain_nr)

            return &r->res;

​

    r = kzalloc(sizeof(*r), GFP_KERNEL);

    if (!r)

        return NULL;

​

    r->domain_nr = domain_nr;

    r->res.start = 0;

    r->res.end = 0xff;

    r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;

​

    list_add_tail(&r->list, &pci_domain_busn_res_list);

​

    return &r->res;

}

​

static int find_anything(struct device *dev, void *data)

{

    return 1;

}

​

/*

 * Some device drivers need know if PCI is initiated.

 * Basically, we think PCI is not initiated when there

 * is no device to be found on the pci_bus_type.

 */

int no_pci_devices(void)

{

    struct device *dev;

    int no_devices;

​

    dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);

    no_devices = (dev == NULL);

    put_device(dev);

    return no_devices;

}

EXPORT_SYMBOL(no_pci_devices);

​

/*

 * PCI Bus Class

 */

static void release_pcibus_dev(struct device *dev)