drivers/pci/hotplug/pci_hotplug.h

   1 /*
   2  * PCI HotPlug Core Functions
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <greg@kroah.com>
  26  *
  27  */
  28 #ifndef _PCI_HOTPLUG_H
  29 #define _PCI_HOTPLUG_H
  30
  31
  32 /* These values come from the PCI Hotplug Spec */
  33 enum pci_bus_speed {
  34         PCI_SPEED_33MHz                 = 0x00,
  35         PCI_SPEED_66MHz                 = 0x01,
  36         PCI_SPEED_66MHz_PCIX            = 0x02,
  37         PCI_SPEED_100MHz_PCIX           = 0x03,
  38         PCI_SPEED_133MHz_PCIX           = 0x04,
  39         PCI_SPEED_66MHz_PCIX_ECC        = 0x05,
  40         PCI_SPEED_100MHz_PCIX_ECC       = 0x06,
  41         PCI_SPEED_133MHz_PCIX_ECC       = 0x07,
  42         PCI_SPEED_66MHz_PCIX_266        = 0x09,
  43         PCI_SPEED_100MHz_PCIX_266       = 0x0a,
  44         PCI_SPEED_133MHz_PCIX_266       = 0x0b,
  45         PCI_SPEED_66MHz_PCIX_533        = 0x11,
  46         PCI_SPEED_100MHz_PCIX_533       = 0x12,
  47         PCI_SPEED_133MHz_PCIX_533       = 0x13,
  48         PCI_SPEED_UNKNOWN               = 0xff,
  49 };
  50
  51 /* These values come from the PCI Express Spec */
  52 enum pcie_link_width {
  53         PCIE_LNK_WIDTH_RESRV    = 0x00,
  54         PCIE_LNK_X1             = 0x01,
  55         PCIE_LNK_X2             = 0x02,
  56         PCIE_LNK_X4             = 0x04,
  57         PCIE_LNK_X8             = 0x08,
  58         PCIE_LNK_X12            = 0x0C,
  59         PCIE_LNK_X16            = 0x10,
  60         PCIE_LNK_X32            = 0x20,
  61         PCIE_LNK_WIDTH_UNKNOWN  = 0xFF,
  62 };
  63
  64 enum pcie_link_speed {
  65         PCIE_2PT5GB             = 0x14,
  66         PCIE_LNK_SPEED_UNKNOWN  = 0xFF,
  67 };
  68
  69 struct hotplug_slot;
  70 struct hotplug_slot_attribute {
  71         struct attribute attr;
  72         ssize_t (*show)(struct hotplug_slot *, char *);
  73         ssize_t (*store)(struct hotplug_slot *, const char *, size_t);
  74 };
  75 #define to_hotplug_attr(n) container_of(n, struct hotplug_slot_attribute, attr);
  76
  77 /**
  78  * struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
  79  * @owner: The module owner of this structure
  80  * @enable_slot: Called when the user wants to enable a specific pci slot
  81  * @disable_slot: Called when the user wants to disable a specific pci slot
  82  * @set_attention_status: Called to set the specific slot's attention LED to
  83  * the specified value
  84  * @hardware_test: Called to run a specified hardware test on the specified
  85  * slot.
  86  * @get_power_status: Called to get the current power status of a slot.
  87  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  88  *      will be used when this value is requested by a user.
  89  * @get_attention_status: Called to get the current attention status of a slot.
  90  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  91  *      will be used when this value is requested by a user.
  92  * @get_latch_status: Called to get the current latch status of a slot.
  93  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  94  *      will be used when this value is requested by a user.
  95  * @get_adapter_status: Called to get see if an adapter is present in the slot or not.
  96  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  97  *      will be used when this value is requested by a user.
  98  * @get_address: Called to get pci address of a slot.
  99  *      If this field is NULL, the value passed in the struct hotplug_slot_info
 100  *      will be used when this value is requested by a user.
 101  * @get_max_bus_speed: Called to get the max bus speed for a slot.
 102  *      If this field is NULL, the value passed in the struct hotplug_slot_info
 103  *      will be used when this value is requested by a user.
 104  * @get_cur_bus_speed: Called to get the current bus speed for a slot.
 105  *      If this field is NULL, the value passed in the struct hotplug_slot_info
 106  *      will be used when this value is requested by a user.
 107  *
 108  * The table of function pointers that is passed to the hotplug pci core by a
 109  * hotplug pci driver.  These functions are called by the hotplug pci core when
 110  * the user wants to do something to a specific slot (query it for information,
 111  * set an LED, enable / disable power, etc.)
 112  */
 113 struct hotplug_slot_ops {
 114         struct module *owner;
 115         int (*enable_slot)              (struct hotplug_slot *slot);
 116         int (*disable_slot)             (struct hotplug_slot *slot);
 117         int (*set_attention_status)     (struct hotplug_slot *slot, u8 value);
 118         int (*hardware_test)            (struct hotplug_slot *slot, u32 value);
 119         int (*get_power_status)         (struct hotplug_slot *slot, u8 *value);
 120         int (*get_attention_status)     (struct hotplug_slot *slot, u8 *value);
 121         int (*get_latch_status)         (struct hotplug_slot *slot, u8 *value);
 122         int (*get_adapter_status)       (struct hotplug_slot *slot, u8 *value);
 123         int (*get_address)              (struct hotplug_slot *slot, u32 *value);
 124         int (*get_max_bus_speed)        (struct hotplug_slot *slot, enum pci_bus_speed *value);
 125         int (*get_cur_bus_speed)        (struct hotplug_slot *slot, enum pci_bus_speed *value);
 126 };
 127
 128 /**
 129  * struct hotplug_slot_info - used to notify the hotplug pci core of the state of the slot
 130  * @power: if power is enabled or not (1/0)
 131  * @attention_status: if the attention light is enabled or not (1/0)
 132  * @latch_status: if the latch (if any) is open or closed (1/0)
 133  * @adapter_present: if there is a pci board present in the slot or not (1/0)
 134  * @address: (domain << 16 | bus << 8 | dev)
 135  *
 136  * Used to notify the hotplug pci core of the status of a specific slot.
 137  */
 138 struct hotplug_slot_info {
 139         u8      power_status;
 140         u8      attention_status;
 141         u8      latch_status;
 142         u8      adapter_status;
 143         u32     address;
 144         enum pci_bus_speed      max_bus_speed;
 145         enum pci_bus_speed      cur_bus_speed;
 146 };
 147
 148 /**
 149  * struct hotplug_slot - used to register a physical slot with the hotplug pci core
 150  * @name: the name of the slot being registered.  This string must
 151  * be unique amoung slots registered on this system.
 152  * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
 153  * @info: pointer to the &struct hotplug_slot_info for the initial values for
 154  * this slot.
 155  * @release: called during pci_hp_deregister to free memory allocated in a
 156  * hotplug_slot structure.
 157  * @private: used by the hotplug pci controller driver to store whatever it
 158  * needs.
 159  */
 160 struct hotplug_slot {
 161         char                            *name;
 162         struct hotplug_slot_ops         *ops;
 163         struct hotplug_slot_info        *info;
 164         void (*release) (struct hotplug_slot *slot);
 165         void                            *private;
 166
 167         /* Variables below this are for use only by the hotplug pci core. */
 168         struct list_head                slot_list;
 169         struct kobject                  kobj;
 170 };
 171 #define to_hotplug_slot(n) container_of(n, struct hotplug_slot, kobj)
 172
 173 extern int pci_hp_register              (struct hotplug_slot *slot);
 174 extern int pci_hp_deregister            (struct hotplug_slot *slot);
 175 extern int pci_hp_change_slot_info      (struct hotplug_slot *slot,
 176                                          struct hotplug_slot_info *info);
 177 extern struct subsystem pci_hotplug_slots_subsys;
 178
 179 #endif
 180