ref: 6c2f8fd5e4f0e0be44495a5526930fa3760cd87e
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)
{
}