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/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/pci.h>
  29 #include <linux/pci_hotplug.h>
  30 #include <linux/proc_fs.h>
  31 #include "../pci.h"
  32 #include "cpci_hotplug.h"
  33
  34 #define MY_NAME "cpci_hotplug"
  35
  36 extern int cpci_debug;
  37
  38 #define dbg(format, arg...)                                     \
  39         do {                                                    \
  40                 if (cpci_debug)                                 \
  41                         printk (KERN_DEBUG "%s: " format "\n",  \
  42                                 MY_NAME , ## arg);              \
  43         } while (0)
  44 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  45 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  46 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  47
  48 #define ROUND_UP(x, a)          (((x) + (a) - 1) & ~((a) - 1))
  49
  50
  51 u8 cpci_get_attention_status(struct slot* slot)
  52 {
  53         int hs_cap;
  54         u16 hs_csr;
  55
  56         hs_cap = pci_bus_find_capability(slot->bus,
  57                                          slot->devfn,
  58                                          PCI_CAP_ID_CHSWP);
  59         if (!hs_cap)
  60                 return 0;
  61
  62         if (pci_bus_read_config_word(slot->bus,
  63                                      slot->devfn,
  64                                      hs_cap + 2,
  65                                      &hs_csr))
  66                 return 0;
  67
  68         return hs_csr & 0x0008 ? 1 : 0;
  69 }
  70
  71 int cpci_set_attention_status(struct slot* slot, int status)
  72 {
  73         int hs_cap;
  74         u16 hs_csr;
  75
  76         hs_cap = pci_bus_find_capability(slot->bus,
  77                                          slot->devfn,
  78                                          PCI_CAP_ID_CHSWP);
  79         if (!hs_cap)
  80                 return 0;
  81         if (pci_bus_read_config_word(slot->bus,
  82                                      slot->devfn,
  83                                      hs_cap + 2,
  84                                      &hs_csr))
  85                 return 0;
  86         if (status)
  87                 hs_csr |= HS_CSR_LOO;
  88         else
  89                 hs_csr &= ~HS_CSR_LOO;
  90         if (pci_bus_write_config_word(slot->bus,
  91                                       slot->devfn,
  92                                       hs_cap + 2,
  93                                       hs_csr))
  94                 return 0;
  95         return 1;
  96 }
  97
  98 u16 cpci_get_hs_csr(struct slot* slot)
  99 {
 100         int hs_cap;
 101         u16 hs_csr;
 102
 103         hs_cap = pci_bus_find_capability(slot->bus,
 104                                          slot->devfn,
 105                                          PCI_CAP_ID_CHSWP);
 106         if (!hs_cap)
 107                 return 0xFFFF;
 108         if (pci_bus_read_config_word(slot->bus,
 109                                      slot->devfn,
 110                                      hs_cap + 2,
 111                                      &hs_csr))
 112                 return 0xFFFF;
 113         return hs_csr;
 114 }
 115
 116 int cpci_check_and_clear_ins(struct slot* slot)
 117 {
 118         int hs_cap;
 119         u16 hs_csr;
 120         int ins = 0;
 121
 122         hs_cap = pci_bus_find_capability(slot->bus,
 123                                          slot->devfn,
 124                                          PCI_CAP_ID_CHSWP);
 125         if (!hs_cap)
 126                 return 0;
 127         if (pci_bus_read_config_word(slot->bus,
 128                                      slot->devfn,
 129                                      hs_cap + 2,
 130                                      &hs_csr))
 131                 return 0;
 132         if (hs_csr & HS_CSR_INS) {
 133                 /* Clear INS (by setting it) */
 134                 if (pci_bus_write_config_word(slot->bus,
 135                                               slot->devfn,
 136                                               hs_cap + 2,
 137                                               hs_csr))
 138                         ins = 0;
 139                 else
 140                         ins = 1;
 141         }
 142         return ins;
 143 }
 144
 145 int cpci_check_ext(struct slot* slot)
 146 {
 147         int hs_cap;
 148         u16 hs_csr;
 149         int ext = 0;
 150
 151         hs_cap = pci_bus_find_capability(slot->bus,
 152                                          slot->devfn,
 153                                          PCI_CAP_ID_CHSWP);
 154         if (!hs_cap)
 155                 return 0;
 156         if (pci_bus_read_config_word(slot->bus,
 157                                      slot->devfn,
 158                                      hs_cap + 2,
 159                                      &hs_csr))
 160                 return 0;
 161         if (hs_csr & HS_CSR_EXT)
 162                 ext = 1;
 163         return ext;
 164 }
 165
 166 int cpci_clear_ext(struct slot* slot)
 167 {
 168         int hs_cap;
 169         u16 hs_csr;
 170
 171         hs_cap = pci_bus_find_capability(slot->bus,
 172                                          slot->devfn,
 173                                          PCI_CAP_ID_CHSWP);
 174         if (!hs_cap)
 175                 return -ENODEV;
 176         if (pci_bus_read_config_word(slot->bus,
 177                                      slot->devfn,
 178                                      hs_cap + 2,
 179                                      &hs_csr))
 180                 return -ENODEV;
 181         if (hs_csr & HS_CSR_EXT) {
 182                 /* Clear EXT (by setting it) */
 183                 if (pci_bus_write_config_word(slot->bus,
 184                                               slot->devfn,
 185                                               hs_cap + 2,
 186                                               hs_csr))
 187                         return -ENODEV;
 188         }
 189         return 0;
 190 }
 191
 192 int cpci_led_on(struct slot* slot)
 193 {
 194         int hs_cap;
 195         u16 hs_csr;
 196
 197         hs_cap = pci_bus_find_capability(slot->bus,
 198                                          slot->devfn,
 199                                          PCI_CAP_ID_CHSWP);
 200         if (!hs_cap)
 201                 return -ENODEV;
 202         if (pci_bus_read_config_word(slot->bus,
 203                                      slot->devfn,
 204                                      hs_cap + 2,
 205                                      &hs_csr))
 206                 return -ENODEV;
 207         if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
 208                 hs_csr |= HS_CSR_LOO;
 209                 if (pci_bus_write_config_word(slot->bus,
 210                                               slot->devfn,
 211                                               hs_cap + 2,
 212                                               hs_csr)) {
 213                         err("Could not set LOO for slot %s",
 214                             slot->hotplug_slot->name);
 215                         return -ENODEV;
 216                 }
 217         }
 218         return 0;
 219 }
 220
 221 int cpci_led_off(struct slot* slot)
 222 {
 223         int hs_cap;
 224         u16 hs_csr;
 225
 226         hs_cap = pci_bus_find_capability(slot->bus,
 227                                          slot->devfn,
 228                                          PCI_CAP_ID_CHSWP);
 229         if (!hs_cap)
 230                 return -ENODEV;
 231         if (pci_bus_read_config_word(slot->bus,
 232                                      slot->devfn,
 233                                      hs_cap + 2,
 234                                      &hs_csr))
 235                 return -ENODEV;
 236         if (hs_csr & HS_CSR_LOO) {
 237                 hs_csr &= ~HS_CSR_LOO;
 238                 if (pci_bus_write_config_word(slot->bus,
 239                                               slot->devfn,
 240                                               hs_cap + 2,
 241                                               hs_csr)) {
 242                         err("Could not clear LOO for slot %s",
 243                             slot->hotplug_slot->name);
 244                         return -ENODEV;
 245                 }
 246         }
 247         return 0;
 248 }
 249
 250
 251 /*
 252  * Device configuration functions
 253  */
 254
 255 int cpci_configure_slot(struct slot* slot)
 256 {
 257         struct pci_bus *parent;
 258         int fn;
 259
 260         dbg("%s - enter", __FUNCTION__);
 261
 262         if (slot->dev == NULL) {
 263                 dbg("pci_dev null, finding %02x:%02x:%x",
 264                     slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
 265                 slot->dev = pci_get_slot(slot->bus, slot->devfn);
 266         }
 267
 268         /* Still NULL? Well then scan for it! */
 269         if (slot->dev == NULL) {
 270                 int n;
 271                 dbg("pci_dev still null");
 272
 273                 /*
 274                  * This will generate pci_dev structures for all functions, but
 275                  * we will only call this case when lookup fails.
 276                  */
 277                 n = pci_scan_slot(slot->bus, slot->devfn);
 278                 dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n);
 279                 slot->dev = pci_get_slot(slot->bus, slot->devfn);
 280                 if (slot->dev == NULL) {
 281                         err("Could not find PCI device for slot %02x", slot->number);
 282                         return -ENODEV;
 283                 }
 284         }
 285         parent = slot->dev->bus;
 286
 287         for (fn = 0; fn < 8; fn++) {
 288                 struct pci_dev *dev;
 289
 290                 dev = pci_get_slot(parent, PCI_DEVFN(PCI_SLOT(slot->devfn), fn));
 291                 if (!dev)
 292                         continue;
 293                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
 294                     (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
 295                         /* Find an unused bus number for the new bridge */
 296                         struct pci_bus *child;
 297                         unsigned char busnr, start = parent->secondary;
 298                         unsigned char end = parent->subordinate;
 299
 300                         for (busnr = start; busnr <= end; busnr++) {
 301                                 if (!pci_find_bus(pci_domain_nr(parent),
 302                                                   busnr))
 303                                         break;
 304                         }
 305                         if (busnr >= end) {
 306                                 err("No free bus for hot-added bridge\n");
 307                                 pci_dev_put(dev);
 308                                 continue;
 309                         }
 310                         child = pci_add_new_bus(parent, dev, busnr);
 311                         if (!child) {
 312                                 err("Cannot add new bus for %s\n",
 313                                     pci_name(dev));
 314                                 pci_dev_put(dev);
 315                                 continue;
 316                         }
 317                         child->subordinate = pci_do_scan_bus(child);
 318                         pci_bus_size_bridges(child);
 319                 }
 320                 pci_dev_put(dev);
 321         }
 322
 323         pci_bus_assign_resources(parent);
 324         pci_bus_add_devices(parent);
 325         pci_enable_bridges(parent);
 326
 327         dbg("%s - exit", __FUNCTION__);
 328         return 0;
 329 }
 330
 331 int cpci_unconfigure_slot(struct slot* slot)
 332 {
 333         int i;
 334         struct pci_dev *dev;
 335
 336         dbg("%s - enter", __FUNCTION__);
 337         if (!slot->dev) {
 338                 err("No device for slot %02x\n", slot->number);
 339                 return -ENODEV;
 340         }
 341
 342         for (i = 0; i < 8; i++) {
 343                 dev = pci_get_slot(slot->bus,
 344                                     PCI_DEVFN(PCI_SLOT(slot->devfn), i));
 345                 if (dev) {
 346                         pci_remove_bus_device(dev);
 347                         pci_dev_put(dev);
 348                 }
 349         }
 350         pci_dev_put(slot->dev);
 351         slot->dev = NULL;
 352
 353         dbg("%s - exit", __FUNCTION__);
 354         return 0;
 355 }