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