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/delay.h>
  35 #include <asm/semaphore.h>
  36 #include <asm/io.h>
  37 #include <linux/pcieport_if.h>
  38 #include "pci_hotplug.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
  46 /*#define dbg(format, arg...) do { if (pciehp_debug) printk(KERN_DEBUG "%s: " format, MY_NAME , ## arg); } while (0)*/
  47 #define dbg(format, arg...) do { if (pciehp_debug) printk("%s: " format, MY_NAME , ## arg); } while (0)
  48 #define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
  49 #define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
  50 #define warn(format, arg...) printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
  51
  52 struct pci_func {
  53         struct pci_func *next;
  54         u8 bus;
  55         u8 device;
  56         u8 function;
  57         u8 is_a_board;
  58         u16 status;
  59         u8 configured;
  60         u8 switch_save;
  61         u8 presence_save;
  62         u32 base_length[0x06];
  63         u8 base_type[0x06];
  64         u16 reserved2;
  65         u32 config_space[0x20];
  66         struct pci_resource *mem_head;
  67         struct pci_resource *p_mem_head;
  68         struct pci_resource *io_head;
  69         struct pci_resource *bus_head;
  70         struct pci_dev* pci_dev;
  71 };
  72
  73 struct slot {
  74         struct slot *next;
  75         u8 bus;
  76         u8 device;
  77         u32 number;
  78         u8 is_a_board;
  79         u8 configured;
  80         u8 state;
  81         u8 switch_save;
  82         u8 presence_save;
  83         u32 capabilities;
  84         u16 reserved2;
  85         struct timer_list task_event;
  86         u8 hp_slot;
  87         struct controller *ctrl;
  88         struct hpc_ops *hpc_ops;
  89         struct hotplug_slot *hotplug_slot;
  90         struct list_head        slot_list;
  91 };
  92
  93 struct pci_resource {
  94         struct pci_resource * next;
  95         u32 base;
  96         u32 length;
  97 };
  98
  99 struct event_info {
 100         u32 event_type;
 101         u8 hp_slot;
 102 };
 103
 104 struct controller {
 105         struct controller *next;
 106         struct semaphore crit_sect;     /* critical section semaphore */
 107         void *hpc_ctlr_handle;          /* HPC controller handle */
 108         int num_slots;                  /* Number of slots on ctlr */
 109         int slot_num_inc;               /* 1 or -1 */
 110         struct pci_resource *mem_head;
 111         struct pci_resource *p_mem_head;
 112         struct pci_resource *io_head;
 113         struct pci_resource *bus_head;
 114         struct pci_dev *pci_dev;
 115         struct pci_bus *pci_bus;
 116         struct event_info event_queue[10];
 117         struct slot *slot;
 118         struct hpc_ops *hpc_ops;
 119         wait_queue_head_t queue;        /* sleep & wake process */
 120         u8 next_event;
 121         u8 seg;
 122         u8 bus;
 123         u8 device;
 124         u8 function;
 125         u8 rev;
 126         u8 slot_device_offset;
 127         u8 add_support;
 128         enum pci_bus_speed speed;
 129         u32 first_slot;         /* First physical slot number */  /* PCIE only has 1 slot */
 130         u8 slot_bus;            /* Bus where the slots handled by this controller sit */
 131         u8 ctrlcap;
 132         u16 vendor_id;
 133         u8 cap_base;
 134 };
 135
 136 struct irq_mapping {
 137         u8 barber_pole;
 138         u8 valid_INT;
 139         u8 interrupt[4];
 140 };
 141
 142 struct resource_lists {
 143         struct pci_resource *mem_head;
 144         struct pci_resource *p_mem_head;
 145         struct pci_resource *io_head;
 146         struct pci_resource *bus_head;
 147         struct irq_mapping *irqs;
 148 };
 149
 150 #define INT_BUTTON_IGNORE               0
 151 #define INT_PRESENCE_ON                 1
 152 #define INT_PRESENCE_OFF                2
 153 #define INT_SWITCH_CLOSE                3
 154 #define INT_SWITCH_OPEN                 4
 155 #define INT_POWER_FAULT                 5
 156 #define INT_POWER_FAULT_CLEAR           6
 157 #define INT_BUTTON_PRESS                7
 158 #define INT_BUTTON_RELEASE              8
 159 #define INT_BUTTON_CANCEL               9
 160
 161 #define STATIC_STATE                    0
 162 #define BLINKINGON_STATE                1
 163 #define BLINKINGOFF_STATE               2
 164 #define POWERON_STATE                   3
 165 #define POWEROFF_STATE                  4
 166
 167 #define PCI_TO_PCI_BRIDGE_CLASS         0x00060400
 168
 169 /* Error messages */
 170 #define INTERLOCK_OPEN                  0x00000002
 171 #define ADD_NOT_SUPPORTED               0x00000003
 172 #define CARD_FUNCTIONING                0x00000005
 173 #define ADAPTER_NOT_SAME                0x00000006
 174 #define NO_ADAPTER_PRESENT              0x00000009
 175 #define NOT_ENOUGH_RESOURCES            0x0000000B
 176 #define DEVICE_TYPE_NOT_SUPPORTED       0x0000000C
 177 #define WRONG_BUS_FREQUENCY             0x0000000D
 178 #define POWER_FAILURE                   0x0000000E
 179
 180 #define REMOVE_NOT_SUPPORTED            0x00000003
 181
 182 #define DISABLE_CARD                    1
 183
 184 /* Field definitions in Slot Capabilities Register */
 185 #define ATTN_BUTTN_PRSN 0x00000001
 186 #define PWR_CTRL_PRSN   0x00000002
 187 #define MRL_SENS_PRSN   0x00000004
 188 #define ATTN_LED_PRSN   0x00000008
 189 #define PWR_LED_PRSN    0x00000010
 190 #define HP_SUPR_RM_SUP  0x00000020
 191
 192 #define ATTN_BUTTN(cap)         (cap & ATTN_BUTTN_PRSN)
 193 #define POWER_CTRL(cap)         (cap & PWR_CTRL_PRSN)
 194 #define MRL_SENS(cap)           (cap & MRL_SENS_PRSN)
 195 #define ATTN_LED(cap)           (cap & ATTN_LED_PRSN)
 196 #define PWR_LED(cap)            (cap & PWR_LED_PRSN)
 197 #define HP_SUPR_RM(cap)         (cap & HP_SUPR_RM_SUP)
 198
 199 /*
 200  * error Messages
 201  */
 202 #define msg_initialization_err  "Initialization failure, error=%d\n"
 203 #define msg_HPC_rev_error       "Unsupported revision of the PCI hot plug controller found.\n"
 204 #define msg_HPC_non_pcie        "The PCI hot plug controller is not supported by this driver.\n"
 205 #define msg_HPC_not_supported   "This system is not supported by this version of pciephd module. Upgrade to a newer version of pciehpd\n"
 206 #define msg_unable_to_save      "Unable to store PCI hot plug add resource information. This system must be rebooted before adding any PCI devices.\n"
 207 #define msg_button_on           "PCI slot #%d - powering on due to button press.\n"
 208 #define msg_button_off          "PCI slot #%d - powering off due to button press.\n"
 209 #define msg_button_cancel       "PCI slot #%d - action canceled due to button press.\n"
 210 #define msg_button_ignore       "PCI slot #%d - button press ignored.  (action in progress...)\n"
 211
 212 /* controller functions */
 213 extern int      pciehprm_find_available_resources       (struct controller *ctrl);
 214 extern int      pciehp_event_start_thread       (void);
 215 extern void     pciehp_event_stop_thread        (void);
 216 extern struct   pci_func *pciehp_slot_create    (unsigned char busnumber);
 217 extern struct   pci_func *pciehp_slot_find      (unsigned char bus, unsigned char device, unsigned char index);
 218 extern int      pciehp_enable_slot              (struct slot *slot);
 219 extern int      pciehp_disable_slot             (struct slot *slot);
 220
 221 extern u8       pciehp_handle_attention_button  (u8 hp_slot, void *inst_id);
 222 extern u8       pciehp_handle_switch_change     (u8 hp_slot, void *inst_id);
 223 extern u8       pciehp_handle_presence_change   (u8 hp_slot, void *inst_id);
 224 extern u8       pciehp_handle_power_fault       (u8 hp_slot, void *inst_id);
 225 /* extern void  long_delay (int delay); */
 226
 227 /* resource functions */
 228 extern int      pciehp_resource_sort_and_combine        (struct pci_resource **head);
 229
 230 /* pci functions */
 231 extern int      pciehp_set_irq                  (u8 bus_num, u8 dev_num, u8 int_pin, u8 irq_num);
 232 /*extern int    pciehp_get_bus_dev              (struct controller *ctrl, u8 *bus_num, u8 *dev_num, struct slot *slot);*/
 233 extern int      pciehp_save_config              (struct controller *ctrl, int busnumber, int num_ctlr_slots, int first_device_num);
 234 extern int      pciehp_save_used_resources      (struct controller *ctrl, struct pci_func * func, int flag);
 235 extern int      pciehp_save_slot_config         (struct controller *ctrl, struct pci_func * new_slot);
 236 extern void     pciehp_destroy_board_resources  (struct pci_func * func);
 237 extern int      pciehp_return_board_resources   (struct pci_func * func, struct resource_lists * resources);
 238 extern void     pciehp_destroy_resource_list    (struct resource_lists * resources);
 239 extern int      pciehp_configure_device         (struct controller* ctrl, struct pci_func* func);
 240 extern int      pciehp_unconfigure_device       (struct pci_func* func);
 241
 242
 243 /* Global variables */
 244 extern struct controller *pciehp_ctrl_list;
 245 extern struct pci_func *pciehp_slot_list[256];
 246
 247 /* Inline functions */
 248
 249 static inline struct slot *pciehp_find_slot(struct controller *ctrl, u8 device)
 250 {
 251         struct slot *p_slot, *tmp_slot = NULL;
 252
 253         p_slot = ctrl->slot;
 254
 255         dbg("p_slot = %p\n", p_slot);
 256
 257         while (p_slot && (p_slot->device != device)) {
 258                 tmp_slot = p_slot;
 259                 p_slot = p_slot->next;
 260                 dbg("In while loop, p_slot = %p\n", p_slot);
 261         }
 262         if (p_slot == NULL) {
 263                 err("ERROR: pciehp_find_slot device=0x%x\n", device);
 264                 p_slot = tmp_slot;
 265         }
 266
 267         return p_slot;
 268 }
 269
 270 static inline int wait_for_ctrl_irq(struct controller *ctrl)
 271 {
 272         int retval = 0;
 273
 274         DECLARE_WAITQUEUE(wait, current);
 275
 276         dbg("%s : start\n", __FUNCTION__);
 277         add_wait_queue(&ctrl->queue, &wait);
 278         if (!pciehp_poll_mode)
 279                 /* Sleep for up to 1 second */
 280                 msleep_interruptible(1000);
 281         else
 282                 msleep_interruptible(2500);
 283
 284         remove_wait_queue(&ctrl->queue, &wait);
 285         if (signal_pending(current))
 286                 retval =  -EINTR;
 287
 288         dbg("%s : end\n", __FUNCTION__);
 289         return retval;
 290 }
 291
 292 /* Puts node back in the resource list pointed to by head */
 293 static inline void return_resource(struct pci_resource **head, struct pci_resource *node)
 294 {
 295         if (!node || !head)
 296                 return;
 297         node->next = *head;
 298         *head = node;
 299 }
 300
 301 #define SLOT_NAME_SIZE 10
 302
 303 static inline void make_slot_name(char *buffer, int buffer_size, struct slot *slot)
 304 {
 305         snprintf(buffer, buffer_size, "%04d_%04d", slot->bus, slot->number);
 306 }
 307
 308 enum php_ctlr_type {
 309         PCI,
 310         ISA,
 311         ACPI
 312 };
 313
 314 typedef u8(*php_intr_callback_t) (unsigned int change_id, void *instance_id);
 315
 316 int pcie_init(struct controller *ctrl, struct pcie_device *dev,
 317                 php_intr_callback_t attention_button_callback,
 318                 php_intr_callback_t switch_change_callback,
 319                 php_intr_callback_t presence_change_callback,
 320                 php_intr_callback_t power_fault_callback);
 321
 322
 323 /* This has no meaning for PCI Express, as there is only 1 slot per port */
 324 int pcie_get_ctlr_slot_config(struct controller *ctrl,
 325                 int *num_ctlr_slots,
 326                 int *first_device_num,
 327                 int *physical_slot_num,
 328                 u8 *ctrlcap);
 329
 330 struct hpc_ops {
 331         int     (*power_on_slot)        (struct slot *slot);
 332         int     (*power_off_slot)       (struct slot *slot);
 333         int     (*get_power_status)     (struct slot *slot, u8 *status);
 334         int     (*get_attention_status) (struct slot *slot, u8 *status);
 335         int     (*set_attention_status) (struct slot *slot, u8 status);
 336         int     (*get_latch_status)     (struct slot *slot, u8 *status);
 337         int     (*get_adapter_status)   (struct slot *slot, u8 *status);
 338
 339         int     (*get_max_bus_speed)    (struct slot *slot, enum pci_bus_speed *speed);
 340         int     (*get_cur_bus_speed)    (struct slot *slot, enum pci_bus_speed *speed);
 341
 342         int     (*get_max_lnk_width)    (struct slot *slot, enum pcie_link_width *value);
 343         int     (*get_cur_lnk_width)    (struct slot *slot, enum pcie_link_width *value);
 344
 345         int     (*query_power_fault)    (struct slot *slot);
 346         void    (*green_led_on)         (struct slot *slot);
 347         void    (*green_led_off)        (struct slot *slot);
 348         void    (*green_led_blink)      (struct slot *slot);
 349         void    (*release_ctlr)         (struct controller *ctrl);
 350         int     (*check_lnk_status)     (struct controller *ctrl);
 351 };
 352
 353 #endif                          /* _PCIEHP_H */