114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// 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;
|
|
if (res->start == 0)
|
|
continue; /* disabled */
|
|
if (res->start < 0x100)
|
|
/*
|
|
* Below 0x100 is only standard PC hardware
|
|
* (pics, kbd, timer, dma, ...)
|
|
* We should not get resource conflicts there,
|
|
* and the kernel reserves these anyway
|
|
* (see arch/i386/kernel/setup.c).
|
|
* So, do nothing
|
|
*/
|
|
continue;
|
|
if (res->end < res->start)
|
|
continue; /* invalid */
|
|
|
|
reserve_range(dev, res, 1);
|
|
}
|
|
|
|
for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
|
|
if (res->flags & IORESOURCE_DISABLED)
|
|
continue;
|
|
|
|
reserve_range(dev, res, 0);
|
|
}
|
|
}
|
|
|
|
static int system_pnp_probe(struct pnp_dev *dev,
|
|
const struct pnp_device_id *dev_id)
|
|
{
|
|
reserve_resources_of_dev(dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct pnp_driver system_pnp_driver = {
|
|
.name = "system",
|
|
.id_table = pnp_dev_table,
|
|
.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
|
|
.probe = system_pnp_probe,
|
|
};
|
|
|
|
static int __init pnp_system_init(void)
|
|
{
|
|
return pnp_register_driver(&system_pnp_driver);
|
|
}
|
|
|
|
/*
|
|
* Reserve motherboard resources after PCI claim BARs,
|
|
* but before PCI assign resources for uninitialized PCI devices
|
|
*/
|
|
fs_initcall(pnp_system_init);
|