drivers/pci/hotplug/cpci_hotplug_pci.c

   1 /*
   2  * CompactPCI Hot Plug Driver PCI functions
   3  *
   4  * Copyright (C) 2002,2005 by SOMA Networks, Inc.
   5  *
   6  * All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or (at
  11  * your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  16  * NON INFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Send feedback to <scottm@somanetworks.com>
  24  */
  25
  26 #include <linux/config.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/pci.h>
  30 #include <linux/proc_fs.h>
  31 #include "../pci.h"
  32 #include "pci_hotplug.h"
  33 #include "cpci_hotplug.h"
  34
  35 #define MY_NAME "cpci_hotplug"
  36
  37 extern int cpci_debug;
  38
  39 #define dbg(format, arg...)                                     \
  40         do {                                                    \
  41                 if (cpci_debug)                                 \
  42                         printk (KERN_DEBUG "%s: " format "\n",  \
  43                                 MY_NAME , ## arg);              \
  44         } while (0)
  45 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  46 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  47 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  48
  49 #define ROUND_UP(x, a)          (((x) + (a) - 1) & ~((a) - 1))
  50
  51
  52 u8 cpci_get_attention_status(struct slot* slot)
  53 {
  54         int hs_cap;
  55         u16 hs_csr;
  56
  57         hs_cap = pci_bus_find_capability(slot->bus,
  58                                          slot->devfn,
  59                                          PCI_CAP_ID_CHSWP);
  60         if (!hs_cap)
  61                 return 0;
  62
  63         if (pci_bus_read_config_word(slot->bus,
  64                                      slot->devfn,
  65                                      hs_cap + 2,
  66                                      &hs_csr))
  67                 return 0;
  68
  69         return hs_csr & 0x0008 ? 1 : 0;
  70 }
  71
  72 int cpci_set_attention_status(struct slot* slot, int status)
  73 {
  74         int hs_cap;
  75         u16 hs_csr;
  76
  77         hs_cap = pci_bus_find_capability(slot->bus,
  78                                          slot->devfn,
  79                                          PCI_CAP_ID_CHSWP);
  80         if (!hs_cap)
  81                 return 0;
  82         if (pci_bus_read_config_word(slot->bus,
  83                                      slot->devfn,
  84                                      hs_cap + 2,
  85                                      &hs_csr))
  86                 return 0;
  87         if (status)
  88                 hs_csr |= HS_CSR_LOO;
  89         else
  90                 hs_csr &= ~HS_CSR_LOO;
  91         if (pci_bus_write_config_word(slot->bus,
  92                                       slot->devfn,
  93                                       hs_cap + 2,
  94                                       hs_csr))
  95                 return 0;
  96         return 1;
  97 }
  98
  99 u16 cpci_get_hs_csr(struct slot* slot)
 100 {
 101         int hs_cap;
 102         u16 hs_csr;
 103
 104         hs_cap = pci_bus_find_capability(slot->bus,
 105                                          slot->devfn,
 106                                          PCI_CAP_ID_CHSWP);
 107         if (!hs_cap)
 108                 return 0xFFFF;
 109         if (pci_bus_read_config_word(slot->bus,
 110                                      slot->devfn,
 111                                      hs_cap + 2,
 112                                      &hs_csr))
 113                 return 0xFFFF;
 114         return hs_csr;
 115 }
 116
 117 int cpci_check_and_clear_ins(struct slot* slot)
 118 {
 119         int hs_cap;
 120         u16 hs_csr;
 121         int ins = 0;
 122
 123         hs_cap = pci_bus_find_capability(slot->bus,
 124                                          slot->devfn,
 125                                          PCI_CAP_ID_CHSWP);
 126         if (!hs_cap)
 127                 return 0;
 128         if (pci_bus_read_config_word(slot->bus,
 129                                      slot->devfn,
 130                                      hs_cap + 2,
 131                                      &hs_csr))
 132                 return 0;
 133         if (hs_csr & HS_CSR_INS) {
 134                 /* Clear INS (by setting it) */
 135                 if (pci_bus_write_config_word(slot->bus,
 136                                               slot->devfn,
 137                                               hs_cap + 2,
 138                                               hs_csr))
 139                         ins = 0;
 140                 else
 141                         ins = 1;
 142         }
 143         return ins;
 144 }
 145
 146 int cpci_check_ext(struct slot* slot)
 147 {
 148         int hs_cap;
 149         u16 hs_csr;
 150         int ext = 0;
 151
 152         hs_cap = pci_bus_find_capability(slot->bus,
 153                                          slot->devfn,
 154                                          PCI_CAP_ID_CHSWP);
 155         if (!hs_cap)
 156                 return 0;
 157         if (pci_bus_read_config_word(slot->bus,
 158                                      slot->devfn,
 159                                      hs_cap + 2,
 160                                      &hs_csr))
 161                 return 0;
 162         if (hs_csr & HS_CSR_EXT)
 163                 ext = 1;
 164         return ext;
 165 }
 166
 167 int cpci_clear_ext(struct slot* slot)
 168 {
 169         int hs_cap;
 170         u16 hs_csr;
 171
 172         hs_cap = pci_bus_find_capability(slot->bus,
 173                                          slot->devfn,
 174                                          PCI_CAP_ID_CHSWP);
 175         if (!hs_cap)
 176                 return -ENODEV;
 177         if (pci_bus_read_config_word(slot->bus,
 178                                      slot->devfn,
 179                                      hs_cap + 2,
 180                                      &hs_csr))
 181                 return -ENODEV;
 182         if (hs_csr & HS_CSR_EXT) {
 183                 /* Clear EXT (by setting it) */
 184                 if (pci_bus_write_config_word(slot->bus,
 185                                               slot->devfn,
 186                                               hs_cap + 2,
 187                                               hs_csr))
 188                         return -ENODEV;
 189         }
 190         return 0;
 191 }
 192
 193 int cpci_led_on(struct slot* slot)
 194 {
 195         int hs_cap;
 196         u16 hs_csr;
 197
 198         hs_cap = pci_bus_find_capability(slot->bus,
 199                                          slot->devfn,
 200                                          PCI_CAP_ID_CHSWP);
 201         if (!hs_cap)
 202                 return -ENODEV;
 203         if (pci_bus_read_config_word(slot->bus,
 204                                      slot->devfn,
 205                                      hs_cap + 2,
 206                                      &hs_csr))
 207                 return -ENODEV;
 208         if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
 209                 hs_csr |= HS_CSR_LOO;
 210                 if (pci_bus_write_config_word(slot->bus,
 211                                               slot->devfn,
 212                                               hs_cap + 2,
 213                                               hs_csr)) {
 214                         err("Could not set LOO for slot %s",
 215                             slot->hotplug_slot->name);
 216                         return -ENODEV;
 217                 }
 218         }
 219         return 0;
 220 }
 221
 222 int cpci_led_off(struct slot* slot)
 223 {
 224         int hs_cap;
 225         u16 hs_csr;
 226
 227         hs_cap = pci_bus_find_capability(slot->bus,
 228                                          slot->devfn,
 229                                          PCI_CAP_ID_CHSWP);
 230         if (!hs_cap)
 231                 return -ENODEV;
 232         if (pci_bus_read_config_word(slot->bus,
 233                                      slot->devfn,
 234                                      hs_cap + 2,
 235                                      &hs_csr))
 236                 return -ENODEV;
 237         if (hs_csr & HS_CSR_LOO) {
 238                 hs_csr &= ~HS_CSR_LOO;
 239                 if (pci_bus_write_config_word(slot->bus,
 240                                               slot->devfn,
 241                                               hs_cap + 2,
 242                                               hs_csr)) {
 243                         err("Could not clear LOO for slot %s",
 244                             slot->hotplug_slot->name);
 245                         return -ENODEV;
 246                 }
 247         }
 248         return 0;
 249 }
 250
 251
 252 /*
 253  * Device configuration functions
 254  */
 255
 256 int cpci_configure_slot(struct slot* slot)
 257 {
 258         unsigned char busnr;
 259         struct pci_bus *child;
 260
 261         dbg("%s - enter", __FUNCTION__);
 262
 263         if (slot->dev == NULL) {
 264                 dbg("pci_dev null, finding %02x:%02x:%x",
 265                     slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
 266                 slot->dev = pci_get_slot(slot->bus, slot->devfn);
 267         }
 268
 269         /* Still NULL? Well then scan for it! */
 270         if (slot->dev == NULL) {
 271                 int n;
 272                 dbg("pci_dev still null");
 273
 274                 /*
 275                  * This will generate pci_dev structures for all functions, but
 276                  * we will only call this case when lookup fails.
 277                  */
 278                 n = pci_scan_slot(slot->bus, slot->devfn);
 279                 dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n);
 280                 if (n > 0)
 281                         pci_bus_add_devices(slot->bus);
 282                 slot->dev = pci_get_slot(slot->bus, slot->devfn);
 283                 if (slot->dev == NULL) {
 284                         err("Could not find PCI device for slot %02x", slot->number);
 285                         return 1;
 286                 }
 287         }
 288
 289         if (slot->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 290                 pci_read_config_byte(slot->dev, PCI_SECONDARY_BUS, &busnr);
 291                 child = pci_add_new_bus(slot->dev->bus, slot->dev, busnr);
 292                 pci_do_scan_bus(child);
 293                 pci_bus_size_bridges(child);
 294         }
 295
 296         pci_bus_assign_resources(slot->dev->bus);
 297
 298         dbg("%s - exit", __FUNCTION__);
 299         return 0;
 300 }
 301
 302 int cpci_unconfigure_slot(struct slot* slot)
 303 {
 304         int i;
 305         struct pci_dev *dev;
 306
 307         dbg("%s - enter", __FUNCTION__);
 308         if (!slot->dev) {
 309                 err("No device for slot %02x\n", slot->number);
 310                 return -ENODEV;
 311         }
 312
 313         for (i = 0; i < 8; i++) {
 314                 dev = pci_get_slot(slot->bus,
 315                                     PCI_DEVFN(PCI_SLOT(slot->devfn), i));
 316                 if (dev) {
 317                         pci_remove_bus_device(dev);
 318                         slot->dev = NULL;
 319                 }
 320         }
 321         dbg("%s - exit", __FUNCTION__);
 322         return 0;
 323 }