drivers/firewire/fw-topology.h

   1 /*
   2  * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #ifndef __fw_topology_h
  20 #define __fw_topology_h
  21
  22 #include <linux/list.h>
  23 #include <linux/slab.h>
  24
  25 #include <asm/atomic.h>
  26
  27 enum {
  28         FW_NODE_CREATED,
  29         FW_NODE_UPDATED,
  30         FW_NODE_DESTROYED,
  31         FW_NODE_LINK_ON,
  32         FW_NODE_LINK_OFF,
  33         FW_NODE_INITIATED_RESET,
  34 };
  35
  36 struct fw_node {
  37         u16 node_id;
  38         u8 color;
  39         u8 port_count;
  40         u8 link_on : 1;
  41         u8 initiated_reset : 1;
  42         u8 b_path : 1;
  43         u8 phy_speed : 2; /* As in the self ID packet. */
  44         u8 max_speed : 2; /* Minimum of all phy-speeds on the path from the
  45                            * local node to this node. */
  46         u8 max_depth : 4; /* Maximum depth to any leaf node */
  47         u8 max_hops : 4;  /* Max hops in this sub tree */
  48         atomic_t ref_count;
  49
  50         /* For serializing node topology into a list. */
  51         struct list_head link;
  52
  53         /* Upper layer specific data. */
  54         void *data;
  55
  56         struct fw_node *ports[0];
  57 };
  58
  59 static inline struct fw_node *fw_node_get(struct fw_node *node)
  60 {
  61         atomic_inc(&node->ref_count);
  62
  63         return node;
  64 }
  65
  66 static inline void fw_node_put(struct fw_node *node)
  67 {
  68         if (atomic_dec_and_test(&node->ref_count))
  69                 kfree(node);
  70 }
  71
  72 struct fw_card;
  73 void fw_destroy_nodes(struct fw_card *card);
  74
  75 int fw_compute_block_crc(u32 *block);
  76
  77 #endif /* __fw_topology_h */