ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /os/manga/uartks8695.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/uart.h"
/*
* KS8695 uart; similar to 8250 etc but registers are slightly different,
* and interrupt control is quite different
*/
enum {
UartFREQ = CLOCKFREQ,
};
/*
* similar to i8250/16450/16550 (slight differences)
*/
enum { /* I/O ports */
Rbr = 0, /* Receiver Buffer (RO) */
Thr = 1, /* Transmitter Holding (WO) */
Fcr = 2, /* FIFO Control */
Lcr = 3, /* Line Control */
Mcr = 4, /* Modem Control */
Lsr = 5, /* Line Status */
Msr = 6, /* Modem Status */
Div = 7, /* Divisor */
Usr = 8, /* Status */
};
enum { /* Fcr */
FIFOena = 0x01, /* FIFO enable */
FIFOrclr = 0x02, /* clear Rx FIFO */
FIFOtclr = 0x04, /* clear Tx FIFO */
FIFO1 = 0x00, /* Rx FIFO trigger level 1 byte */
FIFO4 = 0x40, /* 4 bytes */
FIFO8 = 0x80, /* 8 bytes */
FIFO14 = 0xC0, /* 14 bytes */
};
enum { /* Lcr */
Wls5 = 0x00, /* Word Length Select 5 bits/byte */
Wls6 = 0x01, /* 6 bits/byte */
Wls7 = 0x02, /* 7 bits/byte */
Wls8 = 0x03, /* 8 bits/byte */
WlsMASK = 0x03,
Stb = 0x04, /* 2 stop bits */
Pen = 0x08, /* Parity Enable */
Eps = 0x10, /* Even Parity Select */
Stp = 0x20, /* Stick Parity */
Brk = 0x40, /* Break */
Dlab = 0x80, /* Divisor Latch Access Bit */
};
enum { /* Mcr */
Dtr = 0x01, /* Data Terminal Ready */
Rts = 0x02, /* Ready To Send */
Out1 = 0x04, /* UART OUT1 asserted */
Out2 = 0x08, /* UART OUT2 asserted */
Dm = 0x10, /* Diagnostic Mode loopback */
};
enum { /* Lsr */
Dr = 0x01, /* Data Ready */
Oe = 0x02, /* Overrun Error */
Pe = 0x04, /* Parity Error */
Fe = 0x08, /* Framing Error */
Bi = 0x10, /* Break Interrupt */
Thre = 0x20, /* Thr Empty */
Temt = 0x40, /* Tramsmitter Empty */
FIFOerr = 0x80, /* error in receiver FIFO */
LsrInput = FIFOerr|Oe|Pe|Fe|Dr|Bi, /* input status only */
};
enum { /* Msr */
Dcts = 0x01, /* Delta Cts */
Ddsr = 0x02, /* Delta Dsr */
Teri = 0x04, /* Trailing Edge of Ri */
Ddcd = 0x08, /* Delta Dcd */
Cts = 0x10, /* Clear To Send */
Dsr = 0x20, /* Data Set Ready */
Ri = 0x40, /* Ring Indicator */
Dcd = 0x80, /* Data Set Ready */
};
enum { /* Usr */
Uti = 0x01, /* INTST[9]=1=> =1, interrupt is timeout; =0, receive FIFO trigger */
};
typedef struct Ctlr {
ulong* regs;
int irq;
int iena;
Lock;
int fena;
} Ctlr;
extern PhysUart ks8695physuart;
static Ctlr ks8695_ctlr[1] = {
{ .regs = (ulong*)PHYSUART,
.irq = IRQuts, /* base: ts then rs, ls, ms */
},
};
static Uart ks8695_uart[1] = {
{ .regs = &ks8695_ctlr[0],
.name = "eia0",
.freq = UartFREQ,
.phys = &ks8695physuart,
.special= 0,
.next = nil, },
};
#define csr8r(c, r) ((c)->regs[(r)])
#define csr8w(c, r, v) ((c)->regs[(r)] = (v))
static long
ks8695_status(Uart* uart, void* buf, long n, long offset)
{
char *p;
Ctlr *ctlr;
uchar ier, lcr, mcr, msr;
ctlr = uart->regs;
p = malloc(READSTR);
mcr = csr8r(ctlr, Mcr);
msr = csr8r(ctlr, Msr);
ier = INTRREG->en;
lcr = csr8r(ctlr, Lcr);
snprint(p, READSTR,
"b%d c%d d%d e%d l%d m%d p%c r%d s%d i%d ier=%ux\n"
"dev(%d) type(%d) framing(%d) overruns(%d)%s%s%s%s\n",
uart->baud,
uart->hup_dcd,
(msr & Dsr) != 0,
uart->hup_dsr,
(lcr & WlsMASK) + 5,
(ier & (1<<IRQums)) != 0,
(lcr & Pen) ? ((lcr & Eps) ? 'e': 'o'): 'n',
(mcr & Rts) != 0,
(lcr & Stb) ? 2: 1,
ctlr->fena,
ier,
uart->dev,
uart->type,
uart->ferr,
uart->oerr,
(msr & Cts) ? " cts": "",
(msr & Dsr) ? " dsr": "",
(msr & Dcd) ? " dcd": "",
(msr & Ri) ? " ring": ""
);
n = readstr(offset, buf, n, p);
free(p);
return n;
}
static void
ks8695_fifo(Uart* uart, int level)
{
Ctlr *ctlr;
ctlr = uart->regs;
/*
* Changing the FIFOena bit in Fcr flushes data
* from both receive and transmit FIFOs; there's
* no easy way to guarantee not losing data on
* the receive side, but it's possible to wait until
* the transmitter is really empty.
*/
ilock(ctlr);
while(!(csr8r(ctlr, Lsr) & Temt))
;
/*
* Set the trigger level, default is the max.
* value.
*/
ctlr->fena = level;
switch(level){
case 0:
break;
case 1:
level = FIFO1|FIFOena;
break;
case 4:
level = FIFO4|FIFOena;
break;
case 8:
level = FIFO8|FIFOena;
break;
default:
level = FIFO14|FIFOena;
break;
}
csr8w(ctlr, Fcr, level);
iunlock(ctlr);
}
static void
ks8695_dtr(Uart* uart, int on)
{
Ctlr *ctlr;
int r;
/*
* Toggle DTR.
*/
ctlr = uart->regs;
r = csr8r(ctlr, Mcr);
if(on)
r |= Dtr;
else
r &= ~Dtr;
csr8w(ctlr, Mcr, r);
}
static void
ks8695_rts(Uart* uart, int on)
{
Ctlr *ctlr;
int r;
/*
* Toggle RTS.
*/
ctlr = uart->regs;
r = csr8r(ctlr, Mcr);
if(on)
r |= Rts;
else
r &= ~Rts;
csr8w(ctlr, Mcr, r);
}
static void
ks8695_modemctl(Uart* uart, int on)
{
Ctlr *ctlr;
ctlr = uart->regs;
ilock(&uart->tlock);
if(on){
INTRREG->en |= 1<<IRQums; /* TO DO */
uart->modem = 1;
uart->cts = csr8r(ctlr, Msr) & Cts;
}
else{
INTRREG->en &= ~(1<<IRQums);
uart->modem = 0;
uart->cts = 1;
}
iunlock(&uart->tlock);
/* modem needs fifo */
(*uart->phys->fifo)(uart, on);
}
static int
ks8695_parity(Uart* uart, int parity)
{
int lcr;
Ctlr *ctlr;
ctlr = uart->regs;
lcr = csr8r(ctlr, Lcr) & ~(Eps|Pen);
switch(parity){
case 'e':
lcr |= Eps|Pen;
break;
case 'o':
lcr |= Pen;
break;
case 'n':
default:
break;
}
csr8w(ctlr, Lcr, lcr);
uart->parity = parity;
return 0;
}
static int
ks8695_stop(Uart* uart, int stop)
{
int lcr;
Ctlr *ctlr;
ctlr = uart->regs;
lcr = csr8r(ctlr, Lcr);
switch(stop){
case 1:
lcr &= ~Stb;
break;
case 2:
lcr |= Stb;
break;
default:
return -1;
}
csr8w(ctlr, Lcr, lcr);
uart->stop = stop;
return 0;
}
static int
ks8695_bits(Uart* uart, int bits)
{
int lcr;
Ctlr *ctlr;
ctlr = uart->regs;
lcr = csr8r(ctlr, Lcr) & ~WlsMASK;
switch(bits){
case 5:
lcr |= Wls5;
break;
case 6:
lcr |= Wls6;
break;
case 7:
lcr |= Wls7;
break;
case 8:
lcr |= Wls8;
break;
default:
return -1;
}
csr8w(ctlr, Lcr, lcr);
uart->bits = bits;
return 0;
}
static int
ks8695_baud(Uart* uart, int baud)
{
ulong bgc;
Ctlr *ctlr;
if(uart->freq == 0 || baud <= 0)
return -1;
ctlr = uart->regs;
bgc = (uart->freq+baud-1)/baud;
csr8w(ctlr, Div, bgc);
uart->baud = baud;
return 0;
}
static void
ks8695_break(Uart* uart, int ms)
{
Ctlr *ctlr;
int lcr;
/*
* Send a break.
*/
if(ms == 0)
ms = 200;
ctlr = uart->regs;
lcr = csr8r(ctlr, Lcr);
csr8w(ctlr, Lcr, lcr|Brk);
tsleep(&up->sleep, return0, 0, ms);
csr8w(ctlr, Lcr, lcr);
}
static void
ks8695_kick(Uart* uart)
{
int i;
Ctlr *ctlr;
if(uart->cts == 0 || uart->blocked)
return;
ctlr = uart->regs;
for(i = 0; i < 16; i++){
if(!(csr8r(ctlr, Lsr) & Thre))
break;
if(uart->op >= uart->oe && uartstageoutput(uart) == 0)
break;
csr8w(ctlr, Thr, *uart->op++);
}
}
static void
ks8695_modemintr(Ureg*, void *arg)
{
Ctlr *ctlr;
Uart *uart;
int old, r;
uart = arg;
ctlr = uart->regs;
r = csr8r(ctlr, Msr);
if(r & Dcts){
ilock(&uart->tlock);
old = uart->cts;
uart->cts = r & Cts;
if(old == 0 && uart->cts)
uart->ctsbackoff = 2;
iunlock(&uart->tlock);
}
if(r & Ddsr){
old = r & Dsr;
if(uart->hup_dsr && uart->dsr && !old)
uart->dohup = 1;
uart->dsr = old;
}
if(r & Ddcd){
old = r & Dcd;
if(uart->hup_dcd && uart->dcd && !old)
uart->dohup = 1;
uart->dcd = old;
}
}
static void
ks8695_rxintr(Ureg*, void* arg)
{
Ctlr *ctlr;
Uart *uart;
int lsr, r;
/* handle line error status here as well */
uart = arg;
ctlr = uart->regs;
while((lsr = csr8r(ctlr, Lsr) & LsrInput) != 0){
/*
* Consume any received data.
* If the received byte came in with a break,
* parity or framing error, throw it away;
* overrun is an indication that something has
* already been tossed.
*/
if(lsr & (FIFOerr|Oe))
uart->oerr++;
if(lsr & Pe)
uart->perr++;
if(lsr & Fe)
uart->ferr++;
if(lsr & Dr){
r = csr8r(ctlr, Rbr);
if(!(lsr & (Bi|Fe|Pe)))
uartrecv(uart, r);
}
}
}
static void
ks8695_txintr(Ureg*, void* arg)
{
uartkick(arg);
}
static void
ks8695_disable(Uart* uart)
{
Ctlr *ctlr;
/*
* Turn off DTR and RTS, disable interrupts and fifos.
*/
(*uart->phys->dtr)(uart, 0);
(*uart->phys->rts)(uart, 0);
(*uart->phys->fifo)(uart, 0);
ctlr = uart->regs;
if(ctlr->iena != 0){
intrdisable(IRQ, ctlr->irq, ks8695_txintr, uart, uart->name);
intrdisable(IRQ, ctlr->irq+1, ks8695_rxintr, uart, uart->name);
intrdisable(IRQ, ctlr->irq+2, ks8695_rxintr, uart, uart->name);
intrdisable(IRQ, ctlr->irq+3, ks8695_modemintr, uart, uart->name);
ctlr->iena = 0;
}
}
static void
ks8695_enable(Uart* uart, int ie)
{
Ctlr *ctlr;
ctlr = uart->regs;
/*
* Enable interrupts and turn on DTR and RTS.
* Be careful if this is called to set up a polled serial line
* early on not to try to enable interrupts as interrupt-
* -enabling mechanisms might not be set up yet.
*/
if(ctlr->iena == 0 && ie){
intrenable(IRQ, ctlr->irq, ks8695_txintr, uart, uart->name);
intrenable(IRQ, ctlr->irq+1, ks8695_rxintr, uart, uart->name);
intrenable(IRQ, ctlr->irq+2, ks8695_rxintr, uart, uart->name);
intrenable(IRQ, ctlr->irq+3, ks8695_modemintr, uart, uart->name);
ctlr->iena = 1;
}
(*uart->phys->dtr)(uart, 1);
(*uart->phys->rts)(uart, 1);
}
static Uart*
ks8695_pnp(void)
{
return ks8695_uart;
}
static int
ks8695_getc(Uart *uart)
{
Ctlr *ctlr;
ctlr = uart->regs;
while(!(csr8r(ctlr, Lsr)&Dr))
delay(1);
return csr8r(ctlr, Rbr);
}
static void
ks8695_putc(Uart *uart, int c)
{
serialputc(c);
#ifdef ROT
int i;
Ctlr *ctlr;
ctlr = uart->regs;
for(i = 0; !(csr8r(ctlr, Lsr)&Thre) && i < 256; i++)
delay(1);
csr8w(ctlr, Thr, c);
if(c == '\n')
while((csr8r(ctlr, Lsr) & Temt) == 0){ /* let fifo drain */
/* skip */
}
#endif
}
PhysUart ks8695physuart = {
.name = "ks8695",
.pnp = ks8695_pnp,
.enable = ks8695_enable,
.disable = ks8695_disable,
.kick = ks8695_kick,
.dobreak = ks8695_break,
.baud = ks8695_baud,
.bits = ks8695_bits,
.stop = ks8695_stop,
.parity = ks8695_parity,
.modemctl = ks8695_modemctl,
.rts = ks8695_rts,
.dtr = ks8695_dtr,
.status = ks8695_status,
.fifo = ks8695_fifo,
.getc = ks8695_getc,
.putc = ks8695_putc,
};
void
uartconsole(void)
{
Uart *uart;
uart = &ks8695_uart[0];
(*uart->phys->enable)(uart, 0);
uartctl(uart, "b38400 l8 pn s1");
consuart = uart;
uart->console = 1;
}
#define UR(p,r) ((ulong*)(p))[r]
void
serialputc(int c)
{
ulong *p;
if(c == 0)
return;
p = (ulong*)PHYSUART;
while((UR(p,Lsr) & Thre) == 0){
/* skip */
}
UR(p,Thr) = c;
if(c == '\n')
while((UR(p,Lsr) & Temt) == 0){ /* let fifo drain */
/* skip */
}
}
/*
* for iprint, just write it
*/
void
serialputs(char *data, int len)
{
ulong *p;
p = (ulong*)PHYSUART;
while(--len >= 0){
if(*data == '\n')
serialputc('\r');
serialputc(*data++);
}
while((UR(p,Lsr) & Temt) == 0){ /* let fifo drain */
/* skip */
}
}
void (*serwrite)(char*, int) = serialputs;