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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [mips/] [jmr3904-io.c] - Rev 182
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#define READ_UINT8( _register_, _value_ ) \ ((_value_) = *((volatile unsigned char *)(_register_))) #define WRITE_UINT8( _register_, _value_ ) \ (*((volatile unsigned char *)(_register_)) = (_value_)) /* - Board specific addresses for serial chip */ #define DIAG_BASE 0xfffff300 #define DIAG_SLCR (DIAG_BASE+0x00) #define DIAG_SLSR (DIAG_BASE+0x04) #define DIAG_SLDICR (DIAG_BASE+0x08) #define DIAG_SLDISR (DIAG_BASE+0x0C) #define DIAG_SFCR (DIAG_BASE+0x10) #define DIAG_SBRG (DIAG_BASE+0x14) #define DIAG_TFIFO (DIAG_BASE+0x20) #define DIAG_RFIFO (DIAG_BASE+0x30) #define BRG_T0 0x0000 #define BRG_T2 0x0100 #define BRG_T4 0x0200 #define BRG_T5 0x0300 #define READ_UINT16( _register_, _value_ ) \ ((_value_) = *((volatile unsigned short *)(_register_))) #define WRITE_UINT16( _register_, _value_ ) \ (*((volatile unsigned short *)(_register_)) = (_value_)) unsigned char inbyte (void) { unsigned char c; unsigned short disr; for (;;) { READ_UINT16 (DIAG_SLDISR, disr); if (disr & 0x0001) break; } disr = disr & ~0x0001; READ_UINT8 (DIAG_RFIFO, c); WRITE_UINT16 (DIAG_SLDISR, disr); return c; } void outbyte (unsigned char c) { unsigned short disr; for (;;) { READ_UINT16 (DIAG_SLDISR, disr); if (disr & 0x0002) break; } disr = disr & ~0x0002; WRITE_UINT8 (DIAG_TFIFO, c); WRITE_UINT16 (DIAG_SLDISR, disr); } /* Stuff required to setup IO on this board */ void board_serial_init (void) { WRITE_UINT16 (DIAG_SLCR, 0x0020); WRITE_UINT16 (DIAG_SLDICR, 0x0000); WRITE_UINT16 (DIAG_SFCR, 0x0000); WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5); } /* If you want this to be initialized as part of the stuff which gets called by crt0, it should be named 'hardware_init_hook'. Local implementations may want to move or add to this function OR do the initializations after main() is entered. */ void hardware_init_hook(void) { board_serial_init() ; } /* Structure filled in by get_mem_info. Only the size field is actually used (by sbrk), so the others aren't even filled in. */ struct s_mem { unsigned int size; unsigned int icsize; unsigned int dcsize; }; /* mem_size is provided in the linker script so that we don't have to define it here. */ extern char _mem_size[]; void get_mem_info (mem) struct s_mem *mem; { mem->size = (unsigned int)_mem_size; }
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