system.c
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/*
* 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);