platform/gp2x/940.c

   1 #include "940shared.h"\r
   2 \r
   3 /* this code assumes that we live @ 0x3000000 bank */\r
   4 //static volatile unsigned short *gp2x_memregs = (void *) 0x0xbd000000;\r
   5 //static volatile unsigned long  *gp2x_memregl = (void *) 0x0xbd000000;\r
   6 \r
   7 static _940_data_t *shared_data = (_940_data_t *) 0x100000;\r
   8 static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)  0x200000;\r
   9 YM2612 *ym2612_940;\r
  10 int *mix_buffer;\r
  11 \r
  12 // from init.s\r
  13 void wait_irq(void);\r
  14 void spend_cycles(int c);\r
  15 void cache_clean(void);\r
  16 void cache_clean_flush(void);\r
  17 \r
  18 //      asm volatile ("mov r0, #0" ::: "r0");\r
  19 //      asm volatile ("mcr p15, 0, r0, c7, c6,  0" ::: "r0"); /* flush dcache */\r
  20 //      asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r
  21 \r
  22 void Main940(int startvector)\r
  23 {\r
  24         ym2612_940 = &shared_data->ym2612;\r
  25         mix_buffer = shared_data->mix_buffer;\r
  26 \r
  27         // debug\r
  28         shared_ctl->vstarts[startvector]++;\r
  29         asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
  30 \r
  31         /* unmask IRQs */\r
  32 \r
  33         for (;; shared_ctl->loopc++)\r
  34         {\r
  35 /*\r
  36                 while (!shared_ctl->busy)\r
  37                 {\r
  38                         //shared_ctl->waitc++;\r
  39                         spend_cycles(256);\r
  40                 }\r
  41 */\r
  42                 if (!shared_ctl->busy)\r
  43                 {\r
  44                         wait_irq();\r
  45                 }\r
  46 \r
  47                 switch (shared_ctl->job)\r
  48                 {\r
  49                         case JOB940_YM2612INIT:\r
  50                                 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
  51                                 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
  52                                 break;\r
  53 \r
  54                         case JOB940_YM2612RESETCHIP:\r
  55                                 YM2612ResetChip_();\r
  56                                 break;\r
  57 \r
  58                         case JOB940_PICOSTATELOAD:\r
  59                                 YM2612PicoStateLoad_();\r
  60                                 break;\r
  61 \r
  62                         case JOB940_YM2612UPDATEONE: {\r
  63                                 int i, dw, *wbuff;\r
  64                                 if (shared_ctl->writebuffsel == 1) {\r
  65                                         wbuff = (int *) shared_ctl->writebuff1;\r
  66                                 } else {\r
  67                                         wbuff = (int *) shared_ctl->writebuff0;\r
  68                                 }\r
  69 \r
  70                                 /* playback all writes */\r
  71                                 for (i = 2048/2; i > 0; i--) {\r
  72                                         UINT16 d;\r
  73                                         dw = *wbuff++;\r
  74                                         d = dw;\r
  75                                         if (d == 0xffff) break;\r
  76                                         YM2612Write_(d >> 8, d);\r
  77                                         d = (dw>>16);\r
  78                                         if (d == 0xffff) break;\r
  79                                         YM2612Write_(d >> 8, d);\r
  80                                 }\r
  81 \r
  82                                 YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);\r
  83 //                              cache_clean_flush();\r
  84                                 cache_clean();\r
  85 //                              asm volatile ("mov r0, #0" ::: "r0");\r
  86 //                              asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r
  87                                 break;\r
  88                         }\r
  89                 }\r
  90 \r
  91                 shared_ctl->busy = 0;\r
  92         }\r
  93 }\r