drivers/staging/tidspbridge/rmgr/dspdrv.c

   1 /*
   2  * dspdrv.c
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * Interface to allocate and free bridge resources.
   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
  19 /*  ----------------------------------- Host OS */
  20 #include <linux/types.h>
  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 /*  ----------------------------------- Platform Manager */
  30 #include <dspbridge/drv.h>
  31 #include <dspbridge/dev.h>
  32 #include <dspbridge/dspapi.h>
  33
  34 /*  ----------------------------------- Resource Manager */
  35 #include <dspbridge/mgr.h>
  36
  37 /*  ----------------------------------- This */
  38 #include <dspbridge/dspdrv.h>
  39
  40 /*
  41  *  ======== dsp_init ========
  42  *      Allocates bridge resources. Loads a base image onto DSP, if specified.
  43  */
  44 u32 dsp_init(u32 *init_status)
  45 {
  46         char dev_node[MAXREGPATHLENGTH] = "TIOMAP1510";
  47         int status = -EPERM;
  48         struct drv_object *drv_obj = NULL;
  49         u32 device_node;
  50         u32 device_node_string;
  51
  52         if (!api_init())
  53                 goto func_cont;
  54
  55         status = drv_create(&drv_obj);
  56         if (status) {
  57                 api_exit();
  58                 goto func_cont;
  59         }
  60
  61         /* End drv_create */
  62         /* Request Resources */
  63         status = drv_request_resources((u32) &dev_node, &device_node_string);
  64         if (!status) {
  65                 /* Attempt to Start the Device */
  66                 status = dev_start_device((struct cfg_devnode *)
  67                                           device_node_string);
  68                 if (status)
  69                         (void)drv_release_resources
  70                             ((u32) device_node_string, drv_obj);
  71         } else {
  72                 dev_dbg(bridge, "%s: drv_request_resources Failed\n", __func__);
  73                 status = -EPERM;
  74         }
  75
  76         /* Unwind whatever was loaded */
  77         if (status) {
  78                 /* irrespective of the status of dev_remove_device we conitinue
  79                  * unloading. Get the Driver Object iterate through and remove.
  80                  * Reset the status to E_FAIL to avoid going through
  81                  * api_init_complete2. */
  82                 for (device_node = drv_get_first_dev_extension();
  83                      device_node != 0;
  84                      device_node = drv_get_next_dev_extension(device_node)) {
  85                         (void)dev_remove_device((struct cfg_devnode *)
  86                                                 device_node);
  87                         (void)drv_release_resources((u32) device_node, drv_obj);
  88                 }
  89                 /* Remove the Driver Object */
  90                 (void)drv_destroy(drv_obj);
  91                 drv_obj = NULL;
  92                 api_exit();
  93                 dev_dbg(bridge, "%s: Logical device failed init\n", __func__);
  94         }                       /* Unwinding the loaded drivers */
  95 func_cont:
  96         /* Attempt to Start the Board */
  97         if (!status) {
  98                 /* BRD_AutoStart could fail if the dsp execuetable is not the
  99                  * correct one. We should not propagate that error
 100                  * into the device loader. */
 101                 (void)api_init_complete2();
 102         } else {
 103                 dev_dbg(bridge, "%s: Failed\n", __func__);
 104         }                       /* End api_init_complete2 */
 105         DBC_ENSURE((!status && drv_obj != NULL) ||
 106                    (status && drv_obj == NULL));
 107         *init_status = status;
 108         /* Return the Driver Object */
 109         return (u32) drv_obj;
 110 }
 111
 112 /*
 113  *  ======== dsp_deinit ========
 114  *      Frees the resources allocated for bridge.
 115  */
 116 bool dsp_deinit(u32 device_context)
 117 {
 118         bool ret = true;
 119         u32 device_node;
 120         struct mgr_object *mgr_obj = NULL;
 121         struct drv_data *drv_datap = dev_get_drvdata(bridge);
 122
 123         while ((device_node = drv_get_first_dev_extension()) != 0) {
 124                 (void)dev_remove_device((struct cfg_devnode *)device_node);
 125
 126                 (void)drv_release_resources((u32) device_node,
 127                                         (struct drv_object *)device_context);
 128         }
 129
 130         (void)drv_destroy((struct drv_object *)device_context);
 131
 132         /* Get the Manager Object from driver data
 133          * MGR Destroy will unload the DCD dll */
 134         if (drv_datap && drv_datap->mgr_object) {
 135                 mgr_obj = drv_datap->mgr_object;
 136                 (void)mgr_destroy(mgr_obj);
 137         } else {
 138                 pr_err("%s: Failed to retrieve the object handle\n", __func__);
 139         }
 140
 141         api_exit();
 142
 143         return ret;
 144 }