ref: 402741bc017cfa9602e7d8ea8645696ace54f4cd
dir: /sys/src/9/bitsy/uartsa1110.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/netif.h"
/* this isn't strictly an sa1110 driver. The rts/cts stuff is h3650 specific */
static void sa1110_uartpower(Uart *, int);
enum
{
/* ctl[0] bits */
Parity= 1<<0,
Even= 1<<1,
Stop2= 1<<2,
Bits8= 1<<3,
SCE= 1<<4, /* synchronous clock enable */
RCE= 1<<5, /* rx on falling edge of clock */
TCE= 1<<6, /* tx on falling edge of clock */
/* ctl[3] bits */
Rena= 1<<0, /* receiver enable */
Tena= 1<<1, /* transmitter enable */
Break= 1<<2, /* force TXD3 low */
Rintena= 1<<3, /* enable receive interrupt */
Tintena= 1<<4, /* enable transmitter interrupt */
Loopback= 1<<5, /* loop back data */
/* data bits */
DEparity= 1<<8, /* parity error */
DEframe= 1<<9, /* framing error */
DEoverrun= 1<<10, /* overrun error */
/* status[0] bits */
Tint= 1<<0, /* transmit fifo half full interrupt */
Rint0= 1<<1, /* receiver fifo 1/3-2/3 full */
Rint1= 1<<2, /* receiver fifo not empty and receiver idle */
Breakstart= 1<<3,
Breakend= 1<<4,
Fifoerror= 1<<5, /* fifo error */
/* status[1] bits */
Tbusy= 1<<0, /* transmitting */
Rnotempty= 1<<1, /* receive fifo not empty */
Tnotfull= 1<<2, /* transmit fifo not full */
ParityError= 1<<3,
FrameError= 1<<4,
Overrun= 1<<5,
};
extern PhysUart sa1110physuart;
//static
Uart sa1110uart[2] = {
{ .regs = (void*)UART3REGS,
.name = "serialport3",
.freq = ClockFreq,
.bits = 8,
.stop = 1,
.parity = 'n',
.baud = 115200,
.phys = &sa1110physuart,
.special = 0,
.next = &sa1110uart[1], },
{ .regs = (void*)UART1REGS,
.name = "serialport1",
.freq = ClockFreq,
.bits = 8,
.stop = 1,
.parity = 'n',
.baud = 115200,
.phys = &sa1110physuart,
.putc = µcputc,
.special = 0,
.next = nil, },
};
static Uart* µcuart;
#define R(p) ((Uartregs*)((p)->regs))
#define SR(p) ((Uartregs*)((p)->saveregs))
/*
* enable a port's interrupts. set DTR and RTS
*/
static void
sa1110_uartenable(Uart *p, int intena)
{
ulong s;
s = R(p)->ctl[3] & ~(Rintena|Tintena|Rena|Tena);
if(intena)
R(p)->ctl[3] = s |Rintena|Tintena|Rena|Tena;
else
R(p)->ctl[3] = s | Rena|Tena;
}
/*
* disable interrupts. clear DTR, and RTS
*/
static void
sa1110_uartdisable(Uart *p)
{
R(p)->ctl[3] &= ~(Rintena|Tintena|Rena|Tena);
}
static long
sa1110_uartstatus(Uart *p, void *buf, long n, long offset)
{
char str[256];
ulong ctl0;
ctl0 = R(p)->ctl[0];
snprint(str, sizeof(str),
"b%d c%d d%d e%d l%d m%d p%c r%d s%d i%d\n"
"dev(%d) type(%d) framing(%d) overruns(%d)%s%s%s%s\n",
p->baud,
p->hup_dcd,
0,
p->hup_dsr,
(ctl0 & Bits8) ? 8 : 7,
0,
(ctl0 & Parity) ? ((ctl0 & Even) ? 'e' : 'o') : 'n',
0,
(ctl0 & Stop2) ? 2 : 1,
1,
p->dev,
p->type,
p->ferr,
p->oerr,
"",
"",
"",
"" );
return readstr(offset, buf, n, str);
}
/*
* set the buad rate
*/
static int
sa1110_uartbaud(Uart *p, int rate)
{
ulong brconst;
ulong ctl3;
if(rate <= 0)
return -1;
/* disable */
ctl3 = R(p)->ctl[3];
R(p)->ctl[3] = 0;
brconst = p->freq/(16*rate) - 1;
R(p)->ctl[1] = (brconst>>8) & 0xf;
R(p)->ctl[2] = brconst & 0xff;
/* reenable */
R(p)->ctl[3] = ctl3;
p->baud = rate;
return 0;
}
/*
* send a break
*/
static void
sa1110_uartbreak(Uart *p, int ms)
{
if(ms == 0)
ms = 200;
R(p)->ctl[3] |= Break;
tsleep(&up->sleep, return0, 0, ms);
R(p)->ctl[3] &= ~Break;
}
/*
* set bits/char
*/
static int
sa1110_uartbits(Uart *p, int n)
{
ulong ctl0, ctl3;
ctl0 = R(p)->ctl[0];
switch(n){
case 7:
ctl0 &= ~Bits8;
break;
case 8:
ctl0 |= Bits8;
break;
default:
return -1;
}
/* disable */
ctl3 = R(p)->ctl[3];
R(p)->ctl[3] = 0;
R(p)->ctl[0] = ctl0;
/* reenable */
R(p)->ctl[3] = ctl3;
p->bits = n;
return 0;
}
/*
* set stop bits
*/
static int
sa1110_uartstop(Uart *p, int n)
{
ulong ctl0, ctl3;
ctl0 = R(p)->ctl[0];
switch(n){
case 1:
ctl0 &= ~Stop2;
break;
case 2:
ctl0 |= Stop2;
break;
default:
return -1;
}
/* disable */
ctl3 = R(p)->ctl[3];
R(p)->ctl[3] = 0;
R(p)->ctl[0] = ctl0;
/* reenable */
R(p)->ctl[3] = ctl3;
p->stop = n;
return 0;
}
/*
* turn on/off rts
*/
static void
sa1110_uartrts(Uart*, int)
{
}
/*
* turn on/off dtr
*/
static void
sa1110_uartdtr(Uart*, int)
{
}
/*
* turn on/off modem flow control on/off (rts/cts)
*/
static void
sa1110_uartmodemctl(Uart *p, int on)
{
if(on) {
} else {
p->cts = 1;
}
}
/*
* set parity
*/
static int
sa1110_uartparity(Uart *p, int type)
{
ulong ctl0, ctl3;
ctl0 = R(p)->ctl[0];
switch(type){
case 'e':
ctl0 |= Parity|Even;
break;
case 'o':
ctl0 |= Parity;
break;
default:
ctl0 &= ~(Parity|Even);
break;
}
/* disable */
ctl3 = R(p)->ctl[3];
R(p)->ctl[3] = 0;
R(p)->ctl[0] = ctl0;
/* reenable */
R(p)->ctl[3] = ctl3;
return 0;
}
/*
* restart output if not blocked and OK to send
*/
static void
sa1110_uartkick(Uart *p)
{
int i;
R(p)->ctl[3] &= ~Tintena;
if(p->cts == 0 || p->blocked)
return;
for(i = 0; i < 1024; i++){
if(!(R(p)->status[1] & Tnotfull)){
R(p)->ctl[3] |= Tintena;
break;
}
if(p->op >= p->oe && uartstageoutput(p) == 0)
break;
R(p)->data = *p->op++;
}
}
/*
* take an interrupt
*/
static void
sa1110_uartintr(Ureg*, void *x)
{
Uart *p;
ulong s;
Uartregs *regs;
p = x;
regs = p->regs;
/* receiver interrupt, snarf bytes */
while(regs->status[1] & Rnotempty)
uartrecv(p, regs->data);
/* remember and reset interrupt causes */
s = regs->status[0];
regs->status[0] |= s;
if(s & Tint){
/* transmitter interrupt, restart */
uartkick(p);
}
if(s & (ParityError|FrameError|Overrun)){
if(s & ParityError)
p->parity++;
if(s & FrameError)
p->ferr++;
if(s & Overrun)
p->oerr++;
}
/* receiver interrupt, snarf bytes */
while(regs->status[1] & Rnotempty)
uartrecv(p, regs->data);
}
static Uart*
sa1110_pnp(void)
{
return sa1110uart;
}
static int
sa1110_getc(Uart *uart)
{
Uartregs *ur;
ur = uart->regs;
while((ur->status[1] & Rnotempty) == 0)
;
return ur->data;
}
static void
sa1110_putc(Uart *uart, int c)
{
Uartregs *ur;
ur = uart->regs;
/* wait for output ready */
while((ur->status[1] & Tnotfull) == 0)
;
ur->data = c;
while((ur->status[1] & Tbusy))
;
}
PhysUart sa1110physuart = {
.name= "sa1110",
.pnp= sa1110_pnp,
.enable= sa1110_uartenable,
.disable= sa1110_uartdisable,
.bits= sa1110_uartbits,
.kick= sa1110_uartkick,
.modemctl= sa1110_uartmodemctl,
.baud= sa1110_uartbaud,
.stop= sa1110_uartstop,
.parity= sa1110_uartparity,
.dobreak= sa1110_uartbreak,
.rts= sa1110_uartrts,
.dtr= sa1110_uartdtr,
.status= sa1110_uartstatus,
.power= sa1110_uartpower,
.getc= sa1110_getc,
.putc= sa1110_putc,
};
/*
* for iprint, just write it
*/
void
serialµcputs(uchar *str, int n)
{
Uartregs *ur;
if(µcuart == nil)
return;
ur = µcuart->regs;
while(n-- > 0){
/* wait for output ready */
while((ur->status[1] & Tnotfull) == 0)
;
ur->data = *str++;
}
while((ur->status[1] & Tbusy))
;
}
enum
{
/* gpclk register 0 */
Gpclk_sus= 1<<0, /* set uart mode */
};
Gpclkregs *gpclkregs;
/*
* setup all uarts (called early by main() to allow debugging output to
* a serial port)
*/
void
sa1110_uartsetup(int console)
{
Uart *p;
/* external serial port (eia0) */
p = &sa1110uart[0];
p->regs = mapspecial(UART3REGS, sizeof(Uartregs));
p->saveregs = xalloc(sizeof(Uartregs));
/* set eia0 up as a console */
if(console){
uartctl(p, "b115200 l8 pn s1");
(*p->phys->enable)(p, 0);
p->console = 1;
consuart = p;
}
intrenable(IRQ, IRQuart3, sa1110_uartintr, p, p->name);
/* port for talking to microcontroller (eia1) */
gpclkregs = mapspecial(GPCLKREGS, sizeof(Gpclkregs));
gpclkregs->r0 = Gpclk_sus; /* set uart mode */
p = &sa1110uart[1];
p->regs = mapspecial(UART1REGS, sizeof(Uartregs));
p->saveregs = xalloc(sizeof(Uartregs));
uartctl(p, "b115200 l8 pn s1");
µcuart = p;
p->special = 1;
(*p->phys->enable)(p, 0);
intrenable(IRQ, IRQuart1b, sa1110_uartintr, p, p->name);
}
static void
uartcpy(Uartregs *to, Uartregs *from)
{
to->ctl[0] = from->ctl[0];
// to->ctl[1] = from->ctl[1];
// to->ctl[2] = from->ctl[2];
to->ctl[3] = from->ctl[3];
}
static void
sa1110_uartpower(Uart *p, int powerup)
{
if (powerup) {
/* power up, restore the registers */
uartcpy(R(p), SR(p));
R(p)->status[0] = R(p)->status[0];
} else {
/* power down, save the registers */
uartcpy(SR(p), R(p));
}
}