mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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_ioport_range(char *pnpid, int start, int end)
|
||
|
|
{
|
||
|
|
struct resource *res;
|
||
|
|
char *regionid;
|
||
|
|
|
||
|
|
regionid = kmalloc(16, GFP_KERNEL);
|
||
|
|
if ( regionid == NULL )
|
||
|
|
return;
|
||
|
|
snprintf(regionid, 16, "pnp %s", pnpid);
|
||
|
|
res = request_region(start,end-start+1,regionid);
|
||
|
|
if ( res == NULL )
|
||
|
|
kfree( regionid );
|
||
|
|
else
|
||
|
|
res->flags &= ~IORESOURCE_BUSY;
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
printk(KERN_INFO
|
||
|
|
"pnp: %s: ioport range 0x%x-0x%x %s reserved\n",
|
||
|
|
pnpid, start, end,
|
||
|
|
NULL != res ? "has been" : "could not be"
|
||
|
|
);
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void reserve_resources_of_dev( struct pnp_dev *dev )
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i=0;i<PNP_MAX_PORT;i++) {
|
||
|
|
if (!pnp_port_valid(dev, i))
|
||
|
|
/* end of resources */
|
||
|
|
continue;
|
||
|
|
if (pnp_port_start(dev, i) == 0)
|
||
|
|
/* disabled */
|
||
|
|
/* Do nothing */
|
||
|
|
continue;
|
||
|
|
if (pnp_port_start(dev, i) < 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 (pnp_port_end(dev, i) < pnp_port_start(dev, i))
|
||
|
|
/* invalid endpoint */
|
||
|
|
/* Do nothing */
|
||
|
|
continue;
|
||
|
|
reserve_ioport_range(
|
||
|
|
dev->dev.bus_id,
|
||
|
|
pnp_port_start(dev, i),
|
||
|
|
pnp_port_end(dev, i)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
.remove = NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|