ref: 71292834bbafcf6bc409cfd7691f9e6650df025b
dir: /os/cerf405/uart.c/
#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "ureg.h" /* * uart for initial port */ typedef struct Uartregs Uartregs; struct Uartregs { uchar rbr; #define thr rbr #define dll rbr uchar ier; #define dlm ier uchar fcr; #define iir fcr uchar lcr; uchar mcr; uchar lsr; uchar msr; uchar scr; }; #define UARTREGS(n) ((Uartregs*)(PHYSUART0+(n)*0x100)) enum { /* ier */ Edssi= 1<<3, Elsi= 1<<2, Etbei= 1<<1, Erbfi= 1<<0, /* iir */ Fci0= 0<<4, Fci3= 3<<4, Ipl= 7<<1, Ip= 1<<0, /* fcr */ Rftl1= 0<<6, /* receiver trigger level 1, 16, 32, 56 */ Rftl16= 1<<6, Rftl32= 2<<6, Rftl56= 3<<6, Dms= 1<<3, /* =0, single transfer; =1, multiple transfers */ Tfr= 1<<2, /* transmitter fifo reset */ Rfr= 1<<1, /* receiver fifo reset */ Fifoe= 1<<0, /* =0, disable fifos; =1, enable fifos */ /* lcr */ Dlab= 1<<7, /* =0, normal; =1, dll/dlm visible */ Sb= 1<<6, /* set break */ Sp= 1<<5, /* =1, enable sticky parity */ Eps= 1<<4, /* =1, generate even parity */ Pen= 1<<3, /* =1, enable parity checking */ Sbs= 1<<2, /* =0, 1 stop bit; =1, 1.5 or 2 stop bits (see Wls) */ Wls= 3<<0, /* set to nbit-5 for nbit characters */ /* mcr */ Afc= 1<<5, /* =1, auto flow control enabled */ Loop= 1<<4, /* =1, loop back mode enabled */ Out2= 1<<3, /* =0, OUT2# active */ Out1= 1<<2, /* =0, OUT1# active */ Rts= 1<<1, /* =0, RTS# inactive (1); =1, RTS# active (0) */ Dtr= 1<<0, /* =0, DTS# inactive; =1, DTS# active */ /* lsr */ Rfe= 1<<7, /* error instances in fifo */ Temt= 1<<6, /* transmitter empty */ Thre= 1<<5, /* transmitter holding register/fifo empty */ Be= 1<<4, /* break (interrupt) */ Fe= 1<<3, /* framing error */ Pe= 1<<2, /* parity error */ Oe= 1<<1, /* overrun error */ Dr= 1<<0, /* receiver data ready */ /* msr */ Dcd= 1<<7, /* follows Out2 */ Ri= 1<<6, /* follows Out1 */ Dsr= 1<<5, /* follows Dtr */ Cts= 1<<4, /* follows Rts */ Ddcd= 1<<3, /* Dcd input changed */ Teri= 1<<2, /* Ri changed from 0 to 1 */ Ddsr= 1<<1, /* Dsr input changed */ Dcts= 1<<0, /* Cts input changed */ }; void (*serwrite)(char*, int) = uartputs; void uartinstall(void) { } void uartspecial(int, int, Queue**, Queue**, int (*)(Queue*, int)) { } void uartputc(int c) { Uartregs *r; if(c == 0) return; r = UARTREGS(0); while((r->lsr & Thre) == 0) {} r->thr = c; if(c == '\n') while((r->lsr & Thre) == 0) /* flush xmit fifo */ {} } void uartputs(char *data, int len) { int s; // if(!uartspcl && !redirectconsole) // return; s = splhi(); while(--len >= 0){ if(*data == '\n') uartputc('\r'); uartputc(*data++); } splx(s); } void uartwait(void) { }