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112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
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/*
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* system.c - a driver for reserving pnp system resources
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*
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* Some code is based on pnpbios_core.c
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*
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*/
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#include <linux/pnp.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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static const struct pnp_device_id pnp_dev_table[] = {
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/* General ID for reserving resources */
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{ "PNP0c02", 0 },
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/* memory controller */
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{ "PNP0c01", 0 },
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{ "", 0 }
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};
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static void reserve_ioport_range(char *pnpid, int start, int end)
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{
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struct resource *res;
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char *regionid;
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regionid = kmalloc(16, GFP_KERNEL);
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if ( regionid == NULL )
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return;
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snprintf(regionid, 16, "pnp %s", pnpid);
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res = request_region(start,end-start+1,regionid);
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if ( res == NULL )
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kfree( regionid );
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else
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res->flags &= ~IORESOURCE_BUSY;
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/*
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* Failures at this point are usually harmless. pci quirks for
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* example do reserve stuff they know about too, so we may well
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* have double reservations.
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*/
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printk(KERN_INFO
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"pnp: %s: ioport range 0x%x-0x%x %s reserved\n",
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pnpid, start, end,
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NULL != res ? "has been" : "could not be"
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);
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return;
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}
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static void reserve_resources_of_dev( struct pnp_dev *dev )
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{
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int i;
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for (i=0;i<PNP_MAX_PORT;i++) {
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if (!pnp_port_valid(dev, i))
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/* end of resources */
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continue;
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if (pnp_port_start(dev, i) == 0)
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/* disabled */
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/* Do nothing */
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continue;
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if (pnp_port_start(dev, i) < 0x100)
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/*
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* Below 0x100 is only standard PC hardware
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* (pics, kbd, timer, dma, ...)
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* We should not get resource conflicts there,
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* and the kernel reserves these anyway
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* (see arch/i386/kernel/setup.c).
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* So, do nothing
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*/
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continue;
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if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
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/* invalid endpoint */
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/* Do nothing */
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continue;
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reserve_ioport_range(
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dev->dev.bus_id,
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pnp_port_start(dev, i),
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pnp_port_end(dev, i)
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);
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}
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return;
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}
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static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
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{
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reserve_resources_of_dev(dev);
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return 0;
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}
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static struct pnp_driver system_pnp_driver = {
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.name = "system",
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.id_table = pnp_dev_table,
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.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
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.probe = system_pnp_probe,
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.remove = NULL,
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};
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static int __init pnp_system_init(void)
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{
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return pnp_register_driver(&system_pnp_driver);
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}
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/**
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* Reserve motherboard resources after PCI claim BARs,
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* but before PCI assign resources for uninitialized PCI devices
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*/
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fs_initcall(pnp_system_init);
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