drivers/pci/hotplug/pciehp.h

   1 /*
   2  * PCI Express Hot Plug Controller Driver
   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  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29 #ifndef _PCIEHP_H
  30 #define _PCIEHP_H
  31
  32 #include <linux/types.h>
  33 #include <linux/pci.h>
  34 #include <linux/pci_hotplug.h>
  35 #include <linux/delay.h>
  36 #include <linux/sched.h>                /* signal_pending() */
  37 #include <linux/pcieport_if.h>
  38 #include <linux/mutex.h>
  39
  40 #define MY_NAME "pciehp"
  41
  42 extern int pciehp_poll_mode;
  43 extern int pciehp_poll_time;
  44 extern int pciehp_debug;
  45 extern int pciehp_force;
  46 extern struct workqueue_struct *pciehp_wq;
  47
  48 #define dbg(format, arg...)                                             \
  49         do {                                                            \
  50                 if (pciehp_debug)                                       \
  51                         printk("%s: " format, MY_NAME , ## arg);        \
  52         } while (0)
  53 #define err(format, arg...)                                             \
  54         printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
  55 #define info(format, arg...)                                            \
  56         printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
  57 #define warn(format, arg...)                                            \
  58         printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
  59
  60 #define ctrl_dbg(ctrl, format, arg...)                                  \
  61         do {                                                            \
  62                 if (pciehp_debug)                                       \
  63                         dev_printk(, &ctrl->pcie->device,               \
  64                                         format, ## arg);                \
  65         } while (0)
  66 #define ctrl_err(ctrl, format, arg...)                                  \
  67         dev_err(&ctrl->pcie->device, format, ## arg)
  68 #define ctrl_info(ctrl, format, arg...)                                 \
  69         dev_info(&ctrl->pcie->device, format, ## arg)
  70 #define ctrl_warn(ctrl, format, arg...)                                 \
  71         dev_warn(&ctrl->pcie->device, format, ## arg)
  72
  73 #define SLOT_NAME_SIZE 10
  74 struct slot {
  75         u8 bus;
  76         u8 device;
  77         u32 number;
  78         u8 state;
  79         struct timer_list task_event;
  80         u8 hp_slot;
  81         struct controller *ctrl;
  82         struct hpc_ops *hpc_ops;
  83         struct hotplug_slot *hotplug_slot;
  84         struct list_head        slot_list;
  85         char name[SLOT_NAME_SIZE];
  86         unsigned long last_emi_toggle;
  87         struct delayed_work work;       /* work for button event */
  88         struct mutex lock;
  89 };
  90
  91 struct event_info {
  92         u32 event_type;
  93         struct slot *p_slot;
  94         struct work_struct work;
  95 };
  96
  97 struct controller {
  98         struct mutex crit_sect;         /* critical section mutex */
  99         struct mutex ctrl_lock;         /* controller lock */
 100         int num_slots;                  /* Number of slots on ctlr */
 101         int slot_num_inc;               /* 1 or -1 */
 102         struct pci_dev *pci_dev;
 103         struct pcie_device *pcie;       /* PCI Express port service */
 104         struct list_head slot_list;
 105         struct hpc_ops *hpc_ops;
 106         wait_queue_head_t queue;        /* sleep & wake process */
 107         u8 slot_device_offset;
 108         u32 first_slot;         /* First physical slot number */  /* PCIE only has 1 slot */
 109         u8 slot_bus;            /* Bus where the slots handled by this controller sit */
 110         u32 slot_cap;
 111         u8 cap_base;
 112         struct timer_list poll_timer;
 113         int cmd_busy;
 114         unsigned int no_cmd_complete:1;
 115 };
 116
 117 #define INT_BUTTON_IGNORE               0
 118 #define INT_PRESENCE_ON                 1
 119 #define INT_PRESENCE_OFF                2
 120 #define INT_SWITCH_CLOSE                3
 121 #define INT_SWITCH_OPEN                 4
 122 #define INT_POWER_FAULT                 5
 123 #define INT_POWER_FAULT_CLEAR           6
 124 #define INT_BUTTON_PRESS                7
 125 #define INT_BUTTON_RELEASE              8
 126 #define INT_BUTTON_CANCEL               9
 127
 128 #define STATIC_STATE                    0
 129 #define BLINKINGON_STATE                1
 130 #define BLINKINGOFF_STATE               2
 131 #define POWERON_STATE                   3
 132 #define POWEROFF_STATE                  4
 133
 134 /* Error messages */
 135 #define INTERLOCK_OPEN                  0x00000002
 136 #define ADD_NOT_SUPPORTED               0x00000003
 137 #define CARD_FUNCTIONING                0x00000005
 138 #define ADAPTER_NOT_SAME                0x00000006
 139 #define NO_ADAPTER_PRESENT              0x00000009
 140 #define NOT_ENOUGH_RESOURCES            0x0000000B
 141 #define DEVICE_TYPE_NOT_SUPPORTED       0x0000000C
 142 #define WRONG_BUS_FREQUENCY             0x0000000D
 143 #define POWER_FAILURE                   0x0000000E
 144
 145 /* Field definitions in Slot Capabilities Register */
 146 #define ATTN_BUTTN_PRSN 0x00000001
 147 #define PWR_CTRL_PRSN   0x00000002
 148 #define MRL_SENS_PRSN   0x00000004
 149 #define ATTN_LED_PRSN   0x00000008
 150 #define PWR_LED_PRSN    0x00000010
 151 #define HP_SUPR_RM_SUP  0x00000020
 152 #define EMI_PRSN        0x00020000
 153 #define NO_CMD_CMPL_SUP 0x00040000
 154
 155 #define ATTN_BUTTN(ctrl)        ((ctrl)->slot_cap & ATTN_BUTTN_PRSN)
 156 #define POWER_CTRL(ctrl)        ((ctrl)->slot_cap & PWR_CTRL_PRSN)
 157 #define MRL_SENS(ctrl)          ((ctrl)->slot_cap & MRL_SENS_PRSN)
 158 #define ATTN_LED(ctrl)          ((ctrl)->slot_cap & ATTN_LED_PRSN)
 159 #define PWR_LED(ctrl)           ((ctrl)->slot_cap & PWR_LED_PRSN)
 160 #define HP_SUPR_RM(ctrl)        ((ctrl)->slot_cap & HP_SUPR_RM_SUP)
 161 #define EMI(ctrl)               ((ctrl)->slot_cap & EMI_PRSN)
 162 #define NO_CMD_CMPL(ctrl)       ((ctrl)->slot_cap & NO_CMD_CMPL_SUP)
 163
 164 extern int pciehp_sysfs_enable_slot(struct slot *slot);
 165 extern int pciehp_sysfs_disable_slot(struct slot *slot);
 166 extern u8 pciehp_handle_attention_button(struct slot *p_slot);
 167   extern u8 pciehp_handle_switch_change(struct slot *p_slot);
 168 extern u8 pciehp_handle_presence_change(struct slot *p_slot);
 169 extern u8 pciehp_handle_power_fault(struct slot *p_slot);
 170 extern int pciehp_configure_device(struct slot *p_slot);
 171 extern int pciehp_unconfigure_device(struct slot *p_slot);
 172 extern void pciehp_queue_pushbutton_work(struct work_struct *work);
 173 struct controller *pcie_init(struct pcie_device *dev);
 174 int pciehp_enable_slot(struct slot *p_slot);
 175 int pciehp_disable_slot(struct slot *p_slot);
 176 int pcie_enable_notification(struct controller *ctrl);
 177
 178 static inline struct slot *pciehp_find_slot(struct controller *ctrl, u8 device)
 179 {
 180         struct slot *slot;
 181
 182         list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
 183                 if (slot->device == device)
 184                         return slot;
 185         }
 186
 187         ctrl_err(ctrl, "%s: slot (device=0x%x) not found\n", __func__, device);
 188         return NULL;
 189 }
 190
 191 struct hpc_ops {
 192         int (*power_on_slot)(struct slot *slot);
 193         int (*power_off_slot)(struct slot *slot);
 194         int (*get_power_status)(struct slot *slot, u8 *status);
 195         int (*get_attention_status)(struct slot *slot, u8 *status);
 196         int (*set_attention_status)(struct slot *slot, u8 status);
 197         int (*get_latch_status)(struct slot *slot, u8 *status);
 198         int (*get_adapter_status)(struct slot *slot, u8 *status);
 199         int (*get_emi_status)(struct slot *slot, u8 *status);
 200         int (*toggle_emi)(struct slot *slot);
 201         int (*get_max_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
 202         int (*get_cur_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
 203         int (*get_max_lnk_width)(struct slot *slot, enum pcie_link_width *val);
 204         int (*get_cur_lnk_width)(struct slot *slot, enum pcie_link_width *val);
 205         int (*query_power_fault)(struct slot *slot);
 206         void (*green_led_on)(struct slot *slot);
 207         void (*green_led_off)(struct slot *slot);
 208         void (*green_led_blink)(struct slot *slot);
 209         void (*release_ctlr)(struct controller *ctrl);
 210         int (*check_lnk_status)(struct controller *ctrl);
 211 };
 212
 213 #ifdef CONFIG_ACPI
 214 #include <acpi/acpi.h>
 215 #include <acpi/acpi_bus.h>
 216 #include <acpi/actypes.h>
 217 #include <linux/pci-acpi.h>
 218
 219 static inline int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev)
 220 {
 221         u32 flags = (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
 222                      OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
 223         return acpi_get_hp_hw_control_from_firmware(dev, flags);
 224 }
 225
 226 static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
 227                         struct hotplug_params *hpp)
 228 {
 229         if (ACPI_FAILURE(acpi_get_hp_params_from_firmware(dev->bus, hpp)))
 230                 return -ENODEV;
 231         return 0;
 232 }
 233 #else
 234 #define pciehp_get_hp_hw_control_from_firmware(dev)     0
 235 #define pciehp_get_hp_params_from_firmware(dev, hpp)    (-ENODEV)
 236 #endif                          /* CONFIG_ACPI */
 237 #endif                          /* _PCIEHP_H */