linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * system.c - a driver for reserving pnp system resources

 *

 * Some code is based on pnpbios_core.c

 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>

 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.

 *  Bjorn Helgaas <bjorn.helgaas@hp.com>

 */

​

#include <linux/pnp.h>

#include <linux/device.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/kernel.h>

#include <linux/ioport.h>

​

static const struct pnp_device_id pnp_dev_table[] = {

    /* General ID for reserving resources */

    {"PNP0c02", 0},

    /* memory controller */

    {"PNP0c01", 0},

    {"", 0}

};

​

static void reserve_range(struct pnp_dev *dev, struct resource *r, int port)

{

    char *regionid;

    const char *pnpid = dev_name(&dev->dev);

    resource_size_t start = r->start, end = r->end;

    struct resource *res;

​

    regionid = kmalloc(16, GFP_KERNEL);

    if (!regionid)

        return;

​

    snprintf(regionid, 16, "pnp %s", pnpid);

    if (port)

        res = request_region(start, end - start + 1, regionid);

    else

        res = request_mem_region(start, end - start + 1, regionid);

    if (res)

        res->flags &= ~IORESOURCE_BUSY;

    else

        kfree(regionid);

​

    /*

     * Failures at this point are usually harmless. pci quirks for

     * example do reserve stuff they know about too, so we may well

     * have double reservations.

     */

    dev_info(&dev->dev, "%pR %s reserved\n", r,

         res ? "has been" : "could not be");

}

​

static void reserve_resources_of_dev(struct pnp_dev *dev)

{

    struct resource *res;

    int i;

​

    for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {

        if (res->flags & IORESOURCE_DISABLED)

            continue;