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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(const char *pnpid, resource_size_t start, resource_size_t end, int port)
- {
- struct resource *res;
- char *regionid;
- regionid = kmalloc(16, GFP_KERNEL);
- if (regionid == NULL)
- 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 == 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: %s range 0x%llx-0x%llx %s reserved\n",
- pnpid, port ? "ioport" : "iomem",
- (unsigned long long)start, (unsigned long long)end,
- NULL != res ? "has been" : "could not be");
- }
- static void reserve_resources_of_dev(const struct pnp_dev *dev)
- {
- int i;
- for (i = 0; i < PNP_MAX_PORT; i++) {
- if (!pnp_port_valid(dev, i))
- continue;
- if (pnp_port_start(dev, i) == 0)
- continue; /* disabled */
- 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))
- continue; /* invalid */
- reserve_range(dev->dev.bus_id, pnp_port_start(dev, i),
- pnp_port_end(dev, i), 1);
- }
- for (i = 0; i < PNP_MAX_MEM; i++) {
- if (!pnp_mem_valid(dev, i))
- continue;
- reserve_range(dev->dev.bus_id, pnp_mem_start(dev, i),
- pnp_mem_end(dev, i), 0);
- }
- 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);
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