libgloss/mips/jmr3904-io.c

   1
   2
   3 #define READ_UINT8( _register_, _value_ ) \
   4         ((_value_) = *((volatile unsigned char *)(_register_)))
   5
   6 #define WRITE_UINT8( _register_, _value_ ) \
   7         (*((volatile unsigned char *)(_register_)) = (_value_))
   8
   9  /* - Board specific addresses for serial chip */
  10 #define DIAG_BASE       0xfffff300
  11 #define DIAG_SLCR       (DIAG_BASE+0x00)
  12 #define DIAG_SLSR       (DIAG_BASE+0x04)
  13 #define DIAG_SLDICR     (DIAG_BASE+0x08)
  14 #define DIAG_SLDISR     (DIAG_BASE+0x0C)
  15 #define DIAG_SFCR       (DIAG_BASE+0x10)
  16 #define DIAG_SBRG       (DIAG_BASE+0x14)
  17 #define DIAG_TFIFO      (DIAG_BASE+0x20)
  18 #define DIAG_RFIFO      (DIAG_BASE+0x30)
  19
  20 #define BRG_T0          0x0000
  21 #define BRG_T2          0x0100
  22 #define BRG_T4          0x0200
  23 #define BRG_T5          0x0300
  24
  25
  26 #define READ_UINT16( _register_, _value_ ) \
  27      ((_value_) = *((volatile unsigned short *)(_register_)))
  28
  29 #define WRITE_UINT16( _register_, _value_ ) \
  30      (*((volatile unsigned short *)(_register_)) = (_value_))
  31
  32 unsigned char
  33 inbyte (void)
  34 {
  35   unsigned char c;
  36   unsigned short disr;
  37
  38   for (;;)
  39     {
  40       READ_UINT16 (DIAG_SLDISR, disr);
  41       if (disr & 0x0001)
  42         break;
  43     }
  44   disr = disr & ~0x0001;
  45   READ_UINT8 (DIAG_RFIFO, c);
  46   WRITE_UINT16 (DIAG_SLDISR, disr);
  47   return c;
  48 }
  49
  50 void
  51 outbyte (unsigned char c)
  52 {
  53   unsigned short disr;
  54
  55   for (;;)
  56     {
  57       READ_UINT16 (DIAG_SLDISR, disr);
  58       if (disr & 0x0002)
  59         break;
  60     }
  61   disr = disr & ~0x0002;
  62   WRITE_UINT8 (DIAG_TFIFO, c);
  63   WRITE_UINT16 (DIAG_SLDISR, disr);
  64 }
  65
  66 /* Stuff required to setup IO on this board */
  67 void board_serial_init (void)
  68 {
  69   WRITE_UINT16 (DIAG_SLCR, 0x0020);
  70   WRITE_UINT16 (DIAG_SLDICR, 0x0000);
  71   WRITE_UINT16 (DIAG_SFCR, 0x0000);
  72   WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5);
  73 }
  74
  75 /* If you want this to be initialized as part of the stuff which gets called
  76    by crt0, it should be named 'hardware_init_hook'.
  77    Local implementations may want to move or add to this function OR
  78    do the initializations after main() is entered.
  79 */
  80 void hardware_init_hook(void)
  81 {
  82   board_serial_init() ;
  83 }
  84
  85 /* Structure filled in by get_mem_info.  Only the size field is
  86    actually used (by sbrk), so the others aren't even filled in.  */
  87
  88 struct s_mem
  89 {
  90   unsigned int size;
  91   unsigned int icsize;
  92   unsigned int dcsize;
  93 };
  94
  95 /* mem_size is provided in the linker script so that we don't have to
  96    define it here. */
  97 extern char _mem_size[];
  98
  99 void
 100 get_mem_info (mem)
 101      struct s_mem *mem;
 102 {
 103   mem->size = (unsigned int)_mem_size;
 104 }