include/linux/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 <kristen.c.accardi@intel.com>
  26  *
  27  */
  28 #ifndef _PCI_HOTPLUG_H
  29 #define _PCI_HOTPLUG_H
  30
  31 /* These values come from the PCI Express Spec */
  32 enum pcie_link_width {
  33         PCIE_LNK_WIDTH_RESRV    = 0x00,
  34         PCIE_LNK_X1             = 0x01,
  35         PCIE_LNK_X2             = 0x02,
  36         PCIE_LNK_X4             = 0x04,
  37         PCIE_LNK_X8             = 0x08,
  38         PCIE_LNK_X12            = 0x0C,
  39         PCIE_LNK_X16            = 0x10,
  40         PCIE_LNK_X32            = 0x20,
  41         PCIE_LNK_WIDTH_UNKNOWN  = 0xFF,
  42 };
  43
  44 /**
  45  * struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
  46  * @owner: The module owner of this structure
  47  * @mod_name: The module name (KBUILD_MODNAME) of this structure
  48  * @enable_slot: Called when the user wants to enable a specific pci slot
  49  * @disable_slot: Called when the user wants to disable a specific pci slot
  50  * @set_attention_status: Called to set the specific slot's attention LED to
  51  * the specified value
  52  * @hardware_test: Called to run a specified hardware test on the specified
  53  * slot.
  54  * @get_power_status: Called to get the current power status of a slot.
  55  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  56  *      will be used when this value is requested by a user.
  57  * @get_attention_status: Called to get the current attention status of a slot.
  58  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  59  *      will be used when this value is requested by a user.
  60  * @get_latch_status: Called to get the current latch status of a slot.
  61  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  62  *      will be used when this value is requested by a user.
  63  * @get_adapter_status: Called to get see if an adapter is present in the slot or not.
  64  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  65  *      will be used when this value is requested by a user.
  66  *
  67  * The table of function pointers that is passed to the hotplug pci core by a
  68  * hotplug pci driver.  These functions are called by the hotplug pci core when
  69  * the user wants to do something to a specific slot (query it for information,
  70  * set an LED, enable / disable power, etc.)
  71  */
  72 struct hotplug_slot_ops {
  73         struct module *owner;
  74         const char *mod_name;
  75         int (*enable_slot)              (struct hotplug_slot *slot);
  76         int (*disable_slot)             (struct hotplug_slot *slot);
  77         int (*set_attention_status)     (struct hotplug_slot *slot, u8 value);
  78         int (*hardware_test)            (struct hotplug_slot *slot, u32 value);
  79         int (*get_power_status)         (struct hotplug_slot *slot, u8 *value);
  80         int (*get_attention_status)     (struct hotplug_slot *slot, u8 *value);
  81         int (*get_latch_status)         (struct hotplug_slot *slot, u8 *value);
  82         int (*get_adapter_status)       (struct hotplug_slot *slot, u8 *value);
  83 };
  84
  85 /**
  86  * struct hotplug_slot_info - used to notify the hotplug pci core of the state of the slot
  87  * @power_status: if power is enabled or not (1/0)
  88  * @attention_status: if the attention light is enabled or not (1/0)
  89  * @latch_status: if the latch (if any) is open or closed (1/0)
  90  * @adapter_status: if there is a pci board present in the slot or not (1/0)
  91  *
  92  * Used to notify the hotplug pci core of the status of a specific slot.
  93  */
  94 struct hotplug_slot_info {
  95         u8      power_status;
  96         u8      attention_status;
  97         u8      latch_status;
  98         u8      adapter_status;
  99 };
 100
 101 /**
 102  * struct hotplug_slot - used to register a physical slot with the hotplug pci core
 103  * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
 104  * @info: pointer to the &struct hotplug_slot_info for the initial values for
 105  * this slot.
 106  * @release: called during pci_hp_deregister to free memory allocated in a
 107  * hotplug_slot structure.
 108  * @private: used by the hotplug pci controller driver to store whatever it
 109  * needs.
 110  */
 111 struct hotplug_slot {
 112         struct hotplug_slot_ops         *ops;
 113         struct hotplug_slot_info        *info;
 114         void (*release) (struct hotplug_slot *slot);
 115         void                            *private;
 116
 117         /* Variables below this are for use only by the hotplug pci core. */
 118         struct list_head                slot_list;
 119         struct pci_slot                 *pci_slot;
 120 };
 121 #define to_hotplug_slot(n) container_of(n, struct hotplug_slot, kobj)
 122
 123 static inline const char *hotplug_slot_name(const struct hotplug_slot *slot)
 124 {
 125         return pci_slot_name(slot->pci_slot);
 126 }
 127
 128 int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus, int nr,
 129                       const char *name, struct module *owner,
 130                       const char *mod_name);
 131 int pci_hp_deregister(struct hotplug_slot *slot);
 132 int __must_check pci_hp_change_slot_info(struct hotplug_slot *slot,
 133                                          struct hotplug_slot_info *info);
 134
 135 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 136 #define pci_hp_register(slot, pbus, devnr, name) \
 137         __pci_hp_register(slot, pbus, devnr, name, THIS_MODULE, KBUILD_MODNAME)
 138
 139 /* PCI Setting Record (Type 0) */
 140 struct hpp_type0 {
 141         u32 revision;
 142         u8  cache_line_size;
 143         u8  latency_timer;
 144         u8  enable_serr;
 145         u8  enable_perr;
 146 };
 147
 148 /* PCI-X Setting Record (Type 1) */
 149 struct hpp_type1 {
 150         u32 revision;
 151         u8  max_mem_read;
 152         u8  avg_max_split;
 153         u16 tot_max_split;
 154 };
 155
 156 /* PCI Express Setting Record (Type 2) */
 157 struct hpp_type2 {
 158         u32 revision;
 159         u32 unc_err_mask_and;
 160         u32 unc_err_mask_or;
 161         u32 unc_err_sever_and;
 162         u32 unc_err_sever_or;
 163         u32 cor_err_mask_and;
 164         u32 cor_err_mask_or;
 165         u32 adv_err_cap_and;
 166         u32 adv_err_cap_or;
 167         u16 pci_exp_devctl_and;
 168         u16 pci_exp_devctl_or;
 169         u16 pci_exp_lnkctl_and;
 170         u16 pci_exp_lnkctl_or;
 171         u32 sec_unc_err_sever_and;
 172         u32 sec_unc_err_sever_or;
 173         u32 sec_unc_err_mask_and;
 174         u32 sec_unc_err_mask_or;
 175 };
 176
 177 struct hotplug_params {
 178         struct hpp_type0 *t0;           /* Type0: NULL if not available */
 179         struct hpp_type1 *t1;           /* Type1: NULL if not available */
 180         struct hpp_type2 *t2;           /* Type2: NULL if not available */
 181         struct hpp_type0 type0_data;
 182         struct hpp_type1 type1_data;
 183         struct hpp_type2 type2_data;
 184 };
 185
 186 #ifdef CONFIG_ACPI
 187 #include <acpi/acpi.h>
 188 #include <acpi/acpi_bus.h>
 189 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
 190 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags);
 191 int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
 192 int acpi_pci_detect_ejectable(acpi_handle handle);
 193 #else
 194 static inline int pci_get_hp_params(struct pci_dev *dev,
 195                                     struct hotplug_params *hpp)
 196 {
 197         return -ENODEV;
 198 }
 199 #endif
 200
 201 void pci_configure_slot(struct pci_dev *dev);
 202 #endif
 203