105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
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#define READ_UINT8( _register_, _value_ ) \
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((_value_) = *((volatile unsigned char *)(_register_)))
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#define WRITE_UINT8( _register_, _value_ ) \
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(*((volatile unsigned char *)(_register_)) = (_value_))
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/* - Board specific addresses for serial chip */
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#define DIAG_BASE 0xfffff300
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#define DIAG_SLCR (DIAG_BASE+0x00)
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#define DIAG_SLSR (DIAG_BASE+0x04)
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#define DIAG_SLDICR (DIAG_BASE+0x08)
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#define DIAG_SLDISR (DIAG_BASE+0x0C)
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#define DIAG_SFCR (DIAG_BASE+0x10)
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#define DIAG_SBRG (DIAG_BASE+0x14)
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#define DIAG_TFIFO (DIAG_BASE+0x20)
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#define DIAG_RFIFO (DIAG_BASE+0x30)
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#define BRG_T0 0x0000
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#define BRG_T2 0x0100
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#define BRG_T4 0x0200
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#define BRG_T5 0x0300
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#define READ_UINT16( _register_, _value_ ) \
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((_value_) = *((volatile unsigned short *)(_register_)))
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#define WRITE_UINT16( _register_, _value_ ) \
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(*((volatile unsigned short *)(_register_)) = (_value_))
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unsigned char
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inbyte (void)
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{
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unsigned char c;
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unsigned short disr;
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for (;;)
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{
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READ_UINT16 (DIAG_SLDISR, disr);
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if (disr & 0x0001)
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break;
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}
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disr = disr & ~0x0001;
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READ_UINT8 (DIAG_RFIFO, c);
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WRITE_UINT16 (DIAG_SLDISR, disr);
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return c;
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}
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void
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outbyte (unsigned char c)
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{
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unsigned short disr;
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for (;;)
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{
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READ_UINT16 (DIAG_SLDISR, disr);
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if (disr & 0x0002)
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break;
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}
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disr = disr & ~0x0002;
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WRITE_UINT8 (DIAG_TFIFO, c);
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WRITE_UINT16 (DIAG_SLDISR, disr);
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}
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/* Stuff required to setup IO on this board */
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void board_serial_init (void)
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{
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WRITE_UINT16 (DIAG_SLCR, 0x0020);
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WRITE_UINT16 (DIAG_SLDICR, 0x0000);
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WRITE_UINT16 (DIAG_SFCR, 0x0000);
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WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5);
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}
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/* If you want this to be initialized as part of the stuff which gets called
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by crt0, it should be named 'hardware_init_hook'.
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Local implementations may want to move or add to this function OR
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do the initializations after main() is entered.
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*/
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void hardware_init_hook(void)
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{
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board_serial_init() ;
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}
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/* Structure filled in by get_mem_info. Only the size field is
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actually used (by sbrk), so the others aren't even filled in. */
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struct s_mem
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{
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unsigned int size;
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unsigned int icsize;
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unsigned int dcsize;
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};
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/* mem_size is provided in the linker script so that we don't have to
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define it here. */
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extern char _mem_size[];
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void
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get_mem_info (mem)
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struct s_mem *mem;
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{
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mem->size = (unsigned int)_mem_size;
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}
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