release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/tidspbridge/pmgr/msg.c

   1 /*
   2  * msg.c
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * DSP/BIOS Bridge msg_ctrl Module.
   7  *
   8  * Copyright (C) 2005-2006 Texas Instruments, Inc.
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  */
  18 #include <linux/types.h>
  19
  20 /*  ----------------------------------- Host OS */
  21 #include <dspbridge/host_os.h>
  22
  23 /*  ----------------------------------- DSP/BIOS Bridge */
  24 #include <dspbridge/dbdefs.h>
  25
  26 /*  ----------------------------------- Trace & Debug */
  27 #include <dspbridge/dbc.h>
  28
  29 /*  ----------------------------------- Bridge Driver */
  30 #include <dspbridge/dspdefs.h>
  31
  32 /*  ----------------------------------- Platform Manager */
  33 #include <dspbridge/dev.h>
  34
  35 /*  ----------------------------------- This */
  36 #include <msgobj.h>
  37 #include <dspbridge/msg.h>
  38
  39 /*  ----------------------------------- Globals */
  40 static u32 refs;                /* module reference count */
  41
  42 /*
  43  *  ======== msg_create ========
  44  *  Purpose:
  45  *      Create an object to manage message queues. Only one of these objects
  46  *      can exist per device object.
  47  */
  48 int msg_create(struct msg_mgr **msg_man,
  49                       struct dev_object *hdev_obj, msg_onexit msg_callback)
  50 {
  51         struct bridge_drv_interface *intf_fxns;
  52         struct msg_mgr_ *msg_mgr_obj;
  53         struct msg_mgr *hmsg_mgr;
  54         int status = 0;
  55
  56         DBC_REQUIRE(refs > 0);
  57         DBC_REQUIRE(msg_man != NULL);
  58         DBC_REQUIRE(msg_callback != NULL);
  59         DBC_REQUIRE(hdev_obj != NULL);
  60
  61         *msg_man = NULL;
  62
  63         dev_get_intf_fxns(hdev_obj, &intf_fxns);
  64
  65         /* Let Bridge message module finish the create: */
  66         status =
  67             (*intf_fxns->pfn_msg_create) (&hmsg_mgr, hdev_obj, msg_callback);
  68
  69         if (!status) {
  70                 /* Fill in DSP API message module's fields of the msg_mgr
  71                  * structure */
  72                 msg_mgr_obj = (struct msg_mgr_ *)hmsg_mgr;
  73                 msg_mgr_obj->intf_fxns = intf_fxns;
  74
  75                 /* Finally, return the new message manager handle: */
  76                 *msg_man = hmsg_mgr;
  77         } else {
  78                 status = -EPERM;
  79         }
  80         return status;
  81 }
  82
  83 /*
  84  *  ======== msg_delete ========
  85  *  Purpose:
  86  *      Delete a msg_ctrl manager allocated in msg_create().
  87  */
  88 void msg_delete(struct msg_mgr *hmsg_mgr)
  89 {
  90         struct msg_mgr_ *msg_mgr_obj = (struct msg_mgr_ *)hmsg_mgr;
  91         struct bridge_drv_interface *intf_fxns;
  92
  93         DBC_REQUIRE(refs > 0);
  94
  95         if (msg_mgr_obj) {
  96                 intf_fxns = msg_mgr_obj->intf_fxns;
  97
  98                 /* Let Bridge message module destroy the msg_mgr: */
  99                 (*intf_fxns->pfn_msg_delete) (hmsg_mgr);
 100         } else {
 101                 dev_dbg(bridge, "%s: Error hmsg_mgr handle: %p\n",
 102                         __func__, hmsg_mgr);
 103         }
 104 }
 105
 106 /*
 107  *  ======== msg_exit ========
 108  */
 109 void msg_exit(void)
 110 {
 111         DBC_REQUIRE(refs > 0);
 112         refs--;
 113
 114         DBC_ENSURE(refs >= 0);
 115 }
 116
 117 /*
 118  *  ======== msg_mod_init ========
 119  */
 120 bool msg_mod_init(void)
 121 {
 122         DBC_REQUIRE(refs >= 0);
 123
 124         refs++;
 125
 126         DBC_ENSURE(refs >= 0);
 127
 128         return true;
 129 }