release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/tidspbridge/include/dspbridge/rmm.h

   1 /*
   2  * rmm.h
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * This memory manager provides general heap management and arbitrary
   7  * alignment for any number of memory segments, and management of overlay
   8  * memory.
   9  *
  10  * Copyright (C) 2005-2006 Texas Instruments, Inc.
  11  *
  12  * This package is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  18  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  19  */
  20
  21 #ifndef RMM_
  22 #define RMM_
  23
  24 /*
  25  *  ======== rmm_addr ========
  26  *  DSP address + segid
  27  */
  28 struct rmm_addr {
  29         u32 addr;
  30         s32 segid;
  31 };
  32
  33 /*
  34  *  ======== rmm_segment ========
  35  *  Memory segment on the DSP available for remote allocations.
  36  */
  37 struct rmm_segment {
  38         u32 base;               /* Base of the segment */
  39         u32 length;             /* Size of the segment (target MAUs) */
  40         s32 space;              /* Code or data */
  41         u32 number;             /* Number of Allocated Blocks */
  42 };
  43
  44 /*
  45  *  ======== RMM_Target ========
  46  */
  47 struct rmm_target_obj;
  48
  49 /*
  50  *  ======== rmm_alloc ========
  51  *
  52  *  rmm_alloc is used to remotely allocate or reserve memory on the DSP.
  53  *
  54  *  Parameters:
  55  *      target          - Target returned from rmm_create().
  56  *      segid           - Memory segment to allocate from.
  57  *      size            - Size (target MAUS) to allocate.
  58  *      align           - alignment.
  59  *      dsp_address     - If reserve is FALSE, the location to store allocated
  60  *                        address on output, otherwise, the DSP address to
  61  *                        reserve.
  62  *      reserve         - If TRUE, reserve the memory specified by dsp_address.
  63  *  Returns:
  64  *      0:                Success.
  65  *      -ENOMEM:            Memory allocation on GPP failed.
  66  *      -ENXIO:     Cannot "allocate" overlay memory because it's
  67  *                              already in use.
  68  *  Requires:
  69  *      RMM initialized.
  70  *      Valid target.
  71  *      dsp_address != NULL.
  72  *      size > 0
  73  *      reserve || target->num_segs > 0.
  74  *  Ensures:
  75  */
  76 extern int rmm_alloc(struct rmm_target_obj *target, u32 segid, u32 size,
  77                         u32 align, u32 *dsp_address, bool reserve);
  78
  79 /*
  80  *  ======== rmm_create ========
  81  *  Create a target object with memory segments for remote allocation. If
  82  *  seg_tab == NULL or num_segs == 0, memory can only be reserved through
  83  *  rmm_alloc().
  84  *
  85  *  Parameters:
  86  *      target_obj:        - Location to store target on output.
  87  *      seg_tab:         - Table of memory segments.
  88  *      num_segs:        - Number of memory segments.
  89  *  Returns:
  90  *      0:        Success.
  91  *      -ENOMEM:    Memory allocation failed.
  92  *  Requires:
  93  *      RMM initialized.
  94  *      target_obj != NULL.
  95  *      num_segs == 0 || seg_tab != NULL.
  96  *  Ensures:
  97  *      Success:        Valid *target_obj.
  98  *      Failure:        *target_obj == NULL.
  99  */
 100 extern int rmm_create(struct rmm_target_obj **target_obj,
 101                              struct rmm_segment seg_tab[], u32 num_segs);
 102
 103 /*
 104  *  ======== rmm_delete ========
 105  *  Delete target allocated in rmm_create().
 106  *
 107  *  Parameters:
 108  *      target          - Target returned from rmm_create().
 109  *  Returns:
 110  *  Requires:
 111  *      RMM initialized.
 112  *      Valid target.
 113  *  Ensures:
 114  */
 115 extern void rmm_delete(struct rmm_target_obj *target);
 116
 117 /*
 118  *  ======== rmm_exit ========
 119  *  Exit the RMM module
 120  *
 121  *  Parameters:
 122  *  Returns:
 123  *  Requires:
 124  *      rmm_init successfully called.
 125  *  Ensures:
 126  */
 127 extern void rmm_exit(void);
 128
 129 /*
 130  *  ======== rmm_free ========
 131  *  Free or unreserve memory allocated through rmm_alloc().
 132  *
 133  *  Parameters:
 134  *      target:         - Target returned from rmm_create().
 135  *      segid:          - Segment of memory to free.
 136  *      dsp_address:    - Address to free or unreserve.
 137  *      size:           - Size of memory to free or unreserve.
 138  *      reserved:       - TRUE if memory was reserved only, otherwise FALSE.
 139  *  Returns:
 140  *  Requires:
 141  *      RMM initialized.
 142  *      Valid target.
 143  *      reserved || segid < target->num_segs.
 144  *      reserve || [dsp_address, dsp_address + size] is a valid memory range.
 145  *  Ensures:
 146  */
 147 extern bool rmm_free(struct rmm_target_obj *target, u32 segid, u32 dsp_addr,
 148                      u32 size, bool reserved);
 149
 150 /*
 151  *  ======== rmm_init ========
 152  *  Initialize the RMM module
 153  *
 154  *  Parameters:
 155  *  Returns:
 156  *      TRUE:   Success.
 157  *      FALSE:  Failure.
 158  *  Requires:
 159  *  Ensures:
 160  */
 161 extern bool rmm_init(void);
 162
 163 /*
 164  *  ======== rmm_stat ========
 165  *  Obtain  memory segment status
 166  *
 167  *  Parameters:
 168  *      segid:       Segment ID of the dynamic loading segment.
 169  *      mem_stat_buf: Pointer to allocated buffer into which memory stats are
 170  *                   placed.
 171  *  Returns:
 172  *      TRUE:   Success.
 173  *      FALSE:  Failure.
 174  *  Requires:
 175  *      segid < target->num_segs
 176  *  Ensures:
 177  */
 178 extern bool rmm_stat(struct rmm_target_obj *target, enum dsp_memtype segid,
 179                      struct dsp_memstat *mem_stat_buf);
 180
 181 #endif /* RMM_ */