Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Bjorn Helgaas | a8c78f7 | 2007-01-18 16:43:27 -0700 | [diff] [blame] | 6 | * (c) Copyright 2007 Hewlett-Packard Development Company, L.P. |
| 7 | * Bjorn Helgaas <bjorn.helgaas@hp.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
Rafael J. Wysocki | 0f1b414 | 2015-06-18 18:32:02 +0200 | [diff] [blame] | 10 | #include <linux/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/pnp.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/ioport.h> |
| 17 | |
| 18 | static const struct pnp_device_id pnp_dev_table[] = { |
| 19 | /* General ID for reserving resources */ |
Bjorn Helgaas | 9dd7846 | 2007-07-26 10:41:20 -0700 | [diff] [blame] | 20 | {"PNP0c02", 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | /* memory controller */ |
Bjorn Helgaas | 9dd7846 | 2007-07-26 10:41:20 -0700 | [diff] [blame] | 22 | {"PNP0c01", 0}, |
| 23 | {"", 0} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | }; |
| 25 | |
Rafael J. Wysocki | 0f1b414 | 2015-06-18 18:32:02 +0200 | [diff] [blame] | 26 | #ifdef CONFIG_ACPI |
| 27 | static bool __reserve_range(u64 start, unsigned int length, bool io, char *desc) |
| 28 | { |
| 29 | u8 space_id = io ? ACPI_ADR_SPACE_SYSTEM_IO : ACPI_ADR_SPACE_SYSTEM_MEMORY; |
| 30 | return !acpi_reserve_region(start, length, space_id, IORESOURCE_BUSY, desc); |
| 31 | } |
| 32 | #else |
| 33 | static bool __reserve_range(u64 start, unsigned int length, bool io, char *desc) |
| 34 | { |
| 35 | struct resource *res; |
| 36 | |
| 37 | res = io ? request_region(start, length, desc) : |
| 38 | request_mem_region(start, length, desc); |
| 39 | if (res) { |
| 40 | res->flags &= ~IORESOURCE_BUSY; |
| 41 | return true; |
| 42 | } |
| 43 | return false; |
| 44 | } |
| 45 | #endif |
| 46 | |
Bjorn Helgaas | 9a007b3 | 2009-10-06 15:34:00 -0600 | [diff] [blame] | 47 | static void reserve_range(struct pnp_dev *dev, struct resource *r, int port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | char *regionid; |
Kay Sievers | c85e37c | 2009-01-06 10:44:38 -0800 | [diff] [blame] | 50 | const char *pnpid = dev_name(&dev->dev); |
Bjorn Helgaas | 9a007b3 | 2009-10-06 15:34:00 -0600 | [diff] [blame] | 51 | resource_size_t start = r->start, end = r->end; |
Rafael J. Wysocki | 0f1b414 | 2015-06-18 18:32:02 +0200 | [diff] [blame] | 52 | bool reserved; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | regionid = kmalloc(16, GFP_KERNEL); |
Bjorn Helgaas | b933e19 | 2007-10-16 23:31:11 -0700 | [diff] [blame] | 55 | if (!regionid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | return; |
Bjorn Helgaas | b933e19 | 2007-10-16 23:31:11 -0700 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | snprintf(regionid, 16, "pnp %s", pnpid); |
Rafael J. Wysocki | 0f1b414 | 2015-06-18 18:32:02 +0200 | [diff] [blame] | 59 | reserved = __reserve_range(start, end - start + 1, !!port, regionid); |
| 60 | if (!reserved) |
Bjorn Helgaas | b933e19 | 2007-10-16 23:31:11 -0700 | [diff] [blame] | 61 | kfree(regionid); |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | /* |
| 64 | * Failures at this point are usually harmless. pci quirks for |
| 65 | * example do reserve stuff they know about too, so we may well |
| 66 | * have double reservations. |
| 67 | */ |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 68 | dev_info(&dev->dev, "%pR %s reserved\n", r, |
Rafael J. Wysocki | 0f1b414 | 2015-06-18 18:32:02 +0200 | [diff] [blame] | 69 | reserved ? "has been" : "could not be"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Bjorn Helgaas | b933e19 | 2007-10-16 23:31:11 -0700 | [diff] [blame] | 72 | static void reserve_resources_of_dev(struct pnp_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 74 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | int i; |
| 76 | |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 77 | for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { |
Bjorn Helgaas | aee3ad8 | 2008-06-27 16:56:57 -0600 | [diff] [blame] | 78 | if (res->flags & IORESOURCE_DISABLED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | continue; |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 80 | if (res->start == 0) |
Bjorn Helgaas | 5859554 | 2007-01-18 16:43:46 -0700 | [diff] [blame] | 81 | continue; /* disabled */ |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 82 | if (res->start < 0x100) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | /* |
| 84 | * Below 0x100 is only standard PC hardware |
| 85 | * (pics, kbd, timer, dma, ...) |
| 86 | * We should not get resource conflicts there, |
| 87 | * and the kernel reserves these anyway |
| 88 | * (see arch/i386/kernel/setup.c). |
| 89 | * So, do nothing |
| 90 | */ |
| 91 | continue; |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 92 | if (res->end < res->start) |
Bjorn Helgaas | 5859554 | 2007-01-18 16:43:46 -0700 | [diff] [blame] | 93 | continue; /* invalid */ |
| 94 | |
Bjorn Helgaas | 9a007b3 | 2009-10-06 15:34:00 -0600 | [diff] [blame] | 95 | reserve_range(dev, res, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Bjorn Helgaas | 95ab366 | 2008-04-28 16:34:26 -0600 | [diff] [blame] | 98 | for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { |
Bjorn Helgaas | aee3ad8 | 2008-06-27 16:56:57 -0600 | [diff] [blame] | 99 | if (res->flags & IORESOURCE_DISABLED) |
Bjorn Helgaas | a8c78f7 | 2007-01-18 16:43:27 -0700 | [diff] [blame] | 100 | continue; |
| 101 | |
Bjorn Helgaas | 9a007b3 | 2009-10-06 15:34:00 -0600 | [diff] [blame] | 102 | reserve_range(dev, res, 0); |
Bjorn Helgaas | a8c78f7 | 2007-01-18 16:43:27 -0700 | [diff] [blame] | 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Bjorn Helgaas | 9dd7846 | 2007-07-26 10:41:20 -0700 | [diff] [blame] | 106 | static int system_pnp_probe(struct pnp_dev *dev, |
| 107 | const struct pnp_device_id *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
| 109 | reserve_resources_of_dev(dev); |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static struct pnp_driver system_pnp_driver = { |
Bjorn Helgaas | 07d4e9a | 2007-07-26 10:41:21 -0700 | [diff] [blame] | 114 | .name = "system", |
Bjorn Helgaas | 9dd7846 | 2007-07-26 10:41:20 -0700 | [diff] [blame] | 115 | .id_table = pnp_dev_table, |
Bjorn Helgaas | 07d4e9a | 2007-07-26 10:41:21 -0700 | [diff] [blame] | 116 | .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, |
| 117 | .probe = system_pnp_probe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | }; |
| 119 | |
| 120 | static int __init pnp_system_init(void) |
| 121 | { |
| 122 | return pnp_register_driver(&system_pnp_driver); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Reserve motherboard resources after PCI claim BARs, |
| 127 | * but before PCI assign resources for uninitialized PCI devices |
| 128 | */ |
| 129 | fs_initcall(pnp_system_init); |