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Linux/drivers/pnp/system.c

  1 /*
  2  * system.c - a driver for reserving pnp system resources
  3  *
  4  * Some code is based on pnpbios_core.c
  5  * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
  6  * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
  7  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  8  */
  9 
 10 #include <linux/pnp.h>
 11 #include <linux/device.h>
 12 #include <linux/init.h>
 13 #include <linux/slab.h>
 14 #include <linux/kernel.h>
 15 #include <linux/ioport.h>
 16 
 17 static const struct pnp_device_id pnp_dev_table[] = {
 18         /* General ID for reserving resources */
 19         {"PNP0c02", 0},
 20         /* memory controller */
 21         {"PNP0c01", 0},
 22         {"", 0}
 23 };
 24 
 25 static void reserve_range(struct pnp_dev *dev, struct resource *r, int port)
 26 {
 27         char *regionid;
 28         const char *pnpid = dev_name(&dev->dev);
 29         resource_size_t start = r->start, end = r->end;
 30         struct resource *res;
 31 
 32         regionid = kmalloc(16, GFP_KERNEL);
 33         if (!regionid)
 34                 return;
 35 
 36         snprintf(regionid, 16, "pnp %s", pnpid);
 37         if (port)
 38                 res = request_region(start, end - start + 1, regionid);
 39         else
 40                 res = request_mem_region(start, end - start + 1, regionid);
 41         if (res)
 42                 res->flags &= ~IORESOURCE_BUSY;
 43         else
 44                 kfree(regionid);
 45 
 46         /*
 47          * Failures at this point are usually harmless. pci quirks for
 48          * example do reserve stuff they know about too, so we may well
 49          * have double reservations.
 50          */
 51         dev_info(&dev->dev, "%pR %s reserved\n", r,
 52                  res ? "has been" : "could not be");
 53 }
 54 
 55 static void reserve_resources_of_dev(struct pnp_dev *dev)
 56 {
 57         struct resource *res;
 58         int i;
 59 
 60         for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 61                 if (res->flags & IORESOURCE_DISABLED)
 62                         continue;
 63                 if (res->start == 0)
 64                         continue;       /* disabled */
 65                 if (res->start < 0x100)
 66                         /*
 67                          * Below 0x100 is only standard PC hardware
 68                          * (pics, kbd, timer, dma, ...)
 69                          * We should not get resource conflicts there,
 70                          * and the kernel reserves these anyway
 71                          * (see arch/i386/kernel/setup.c).
 72                          * So, do nothing
 73                          */
 74                         continue;
 75                 if (res->end < res->start)
 76                         continue;       /* invalid */
 77 
 78                 reserve_range(dev, res, 1);
 79         }
 80 
 81         for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 82                 if (res->flags & IORESOURCE_DISABLED)
 83                         continue;
 84 
 85                 reserve_range(dev, res, 0);
 86         }
 87 }
 88 
 89 static int system_pnp_probe(struct pnp_dev *dev,
 90                             const struct pnp_device_id *dev_id)
 91 {
 92         reserve_resources_of_dev(dev);
 93         return 0;
 94 }
 95 
 96 static struct pnp_driver system_pnp_driver = {
 97         .name     = "system",
 98         .id_table = pnp_dev_table,
 99         .flags    = PNP_DRIVER_RES_DO_NOT_CHANGE,
100         .probe    = system_pnp_probe,
101 };
102 
103 static int __init pnp_system_init(void)
104 {
105         return pnp_register_driver(&system_pnp_driver);
106 }
107 
108 /**
109  * Reserve motherboard resources after PCI claim BARs,
110  * but before PCI assign resources for uninitialized PCI devices
111  */
112 fs_initcall(pnp_system_init);
113 

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