drivers/staging/tidspbridge/pmgr/io.c

   1 /*
   2  * io.c
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * IO manager interface: Manages IO between CHNL and msg_ctrl.
   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 /*  ----------------------------------- Platform Manager */
  27 #include <dspbridge/dev.h>
  28
  29 /*  ----------------------------------- This */
  30 #include <ioobj.h>
  31 #include <dspbridge/io.h>
  32
  33 /*
  34  *  ======== io_create ========
  35  *  Purpose:
  36  *      Create an IO manager object, responsible for managing IO between
  37  *      CHNL and msg_ctrl
  38  */
  39 int io_create(struct io_mgr **io_man, struct dev_object *hdev_obj,
  40                      const struct io_attrs *mgr_attrts)
  41 {
  42         struct bridge_drv_interface *intf_fxns;
  43         struct io_mgr *hio_mgr = NULL;
  44         struct io_mgr_ *pio_mgr = NULL;
  45         int status = 0;
  46
  47         *io_man = NULL;
  48
  49         /* A memory base of 0 implies no memory base: */
  50         if ((mgr_attrts->shm_base != 0) && (mgr_attrts->sm_length == 0))
  51                 status = -EINVAL;
  52
  53         if (mgr_attrts->word_size == 0)
  54                 status = -EINVAL;
  55
  56         if (!status) {
  57                 dev_get_intf_fxns(hdev_obj, &intf_fxns);
  58
  59                 /* Let Bridge channel module finish the create: */
  60                 status = (*intf_fxns->io_create) (&hio_mgr, hdev_obj,
  61                                                       mgr_attrts);
  62
  63                 if (!status) {
  64                         pio_mgr = (struct io_mgr_ *)hio_mgr;
  65                         pio_mgr->intf_fxns = intf_fxns;
  66                         pio_mgr->dev_obj = hdev_obj;
  67
  68                         /* Return the new channel manager handle: */
  69                         *io_man = hio_mgr;
  70                 }
  71         }
  72
  73         return status;
  74 }
  75
  76 /*
  77  *  ======== io_destroy ========
  78  *  Purpose:
  79  *      Delete IO manager.
  80  */
  81 int io_destroy(struct io_mgr *hio_mgr)
  82 {
  83         struct bridge_drv_interface *intf_fxns;
  84         struct io_mgr_ *pio_mgr = (struct io_mgr_ *)hio_mgr;
  85         int status;
  86
  87         intf_fxns = pio_mgr->intf_fxns;
  88
  89         /* Let Bridge channel module destroy the io_mgr: */
  90         status = (*intf_fxns->io_destroy) (hio_mgr);
  91
  92         return status;
  93 }