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