include/asm-cris/arch-v32/hwregs/dma.h

   1 /* $Id: dma.h,v 1.7 2005/04/24 18:30:58 starvik Exp $
   2  *
   3  * DMA C definitions and help macros
   4  *
   5  */
   6
   7 #ifndef dma_h
   8 #define dma_h
   9
  10 /* registers */ /* Really needed, since both are listed in sw.list? */
  11 #include "dma_defs.h"
  12
  13
  14 /* descriptors */
  15
  16 // ------------------------------------------------------------ dma_descr_group
  17 typedef struct dma_descr_group {
  18   struct dma_descr_group       *next;
  19   unsigned                      eol        : 1;
  20   unsigned                      tol        : 1;
  21   unsigned                      bol        : 1;
  22   unsigned                                 : 1;
  23   unsigned                      intr       : 1;
  24   unsigned                                 : 2;
  25   unsigned                      en         : 1;
  26   unsigned                                 : 7;
  27   unsigned                      dis        : 1;
  28   unsigned                      md         : 16;
  29   struct dma_descr_group       *up;
  30   union {
  31     struct dma_descr_context   *context;
  32     struct dma_descr_group     *group;
  33   }                             down;
  34 } dma_descr_group;
  35
  36 // ---------------------------------------------------------- dma_descr_context
  37 typedef struct dma_descr_context {
  38   struct dma_descr_context     *next;
  39   unsigned                      eol        : 1;
  40   unsigned                                 : 3;
  41   unsigned                      intr       : 1;
  42   unsigned                                 : 1;
  43   unsigned                      store_mode : 1;
  44   unsigned                      en         : 1;
  45   unsigned                                 : 7;
  46   unsigned                      dis        : 1;
  47   unsigned                      md0        : 16;
  48   unsigned                      md1;
  49   unsigned                      md2;
  50   unsigned                      md3;
  51   unsigned                      md4;
  52   struct dma_descr_data        *saved_data;
  53   char                         *saved_data_buf;
  54 } dma_descr_context;
  55
  56 // ------------------------------------------------------------- dma_descr_data
  57 typedef struct dma_descr_data {
  58   struct dma_descr_data        *next;
  59   char                         *buf;
  60   unsigned                      eol        : 1;
  61   unsigned                                 : 2;
  62   unsigned                      out_eop    : 1;
  63   unsigned                      intr       : 1;
  64   unsigned                      wait       : 1;
  65   unsigned                                 : 2;
  66   unsigned                                 : 3;
  67   unsigned                      in_eop     : 1;
  68   unsigned                                 : 4;
  69   unsigned                      md         : 16;
  70   char                         *after;
  71 } dma_descr_data;
  72
  73 // --------------------------------------------------------------------- macros
  74
  75 // enable DMA channel
  76 #define DMA_ENABLE( inst ) \
  77    do { reg_dma_rw_cfg e = REG_RD( dma, inst, rw_cfg );\
  78         e.en = regk_dma_yes; \
  79         REG_WR( dma, inst, rw_cfg, e); } while( 0 )
  80
  81 // reset DMA channel
  82 #define DMA_RESET( inst ) \
  83    do { reg_dma_rw_cfg r = REG_RD( dma, inst, rw_cfg );\
  84         r.en = regk_dma_no; \
  85         REG_WR( dma, inst, rw_cfg, r); } while( 0 )
  86
  87 // stop DMA channel
  88 #define DMA_STOP( inst ) \
  89    do { reg_dma_rw_cfg s = REG_RD( dma, inst, rw_cfg );\
  90         s.stop = regk_dma_yes; \
  91         REG_WR( dma, inst, rw_cfg, s); } while( 0 )
  92
  93 // continue DMA channel operation
  94 #define DMA_CONTINUE( inst ) \
  95    do { reg_dma_rw_cfg c = REG_RD( dma, inst, rw_cfg );\
  96         c.stop = regk_dma_no; \
  97         REG_WR( dma, inst, rw_cfg, c); } while( 0 )
  98
  99 // give stream command
 100 #define DMA_WR_CMD( inst, cmd_par ) \
 101    do { reg_dma_rw_stream_cmd r = {0}; \
 102         do { r = REG_RD( dma, inst, rw_stream_cmd ); } while( r.busy ); \
 103         r.cmd = (cmd_par); \
 104         REG_WR( dma, inst, rw_stream_cmd, r ); \
 105       } while( 0 )
 106
 107 // load: g,c,d:burst
 108 #define DMA_START_GROUP( inst, group_descr ) \
 109    do { REG_WR_INT( dma, inst, rw_group, (int) group_descr ); \
 110         DMA_WR_CMD( inst, regk_dma_load_g ); \
 111         DMA_WR_CMD( inst, regk_dma_load_c ); \
 112         DMA_WR_CMD( inst, regk_dma_load_d | regk_dma_burst ); \
 113       } while( 0 )
 114
 115 // load: c,d:burst
 116 #define DMA_START_CONTEXT( inst, ctx_descr ) \
 117    do { REG_WR_INT( dma, inst, rw_group_down, (int) ctx_descr ); \
 118         DMA_WR_CMD( inst, regk_dma_load_c ); \
 119         DMA_WR_CMD( inst, regk_dma_load_d | regk_dma_burst ); \
 120       } while( 0 )
 121
 122 // if the DMA is at the end of the data list, the last data descr is reloaded
 123 #define DMA_CONTINUE_DATA( inst ) \
 124 do { reg_dma_rw_cmd c = {0}; \
 125      c.cont_data = regk_dma_yes;\
 126      REG_WR( dma, inst, rw_cmd, c ); } while( 0 )
 127
 128 #endif