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retrobsd/sys/pic32/uart.c
Serge Vakulenko 5cb608d7e1 Rename other disk drivers which needed rdisk. 
Delete device names from all the drivers.
Move device inslude files from include/sys to include/machine directory.
Only include files which have something useful for user layer
(like special ioctls codes) should be placed into sys.
2015-09-26 23:00:13 -07:00

511 lines
13 KiB
C
Raw Blame History

/*
* UART driver for PIC32.
*
* Copyright (c) 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/systm.h>
#include <sys/kconfig.h>
#include <machine/uart.h>
#define CONCAT(x,y) x ## y
#define BBAUD(x) CONCAT(B,x)
#ifndef UART_BAUD
#define UART_BAUD 115200
#endif
/*
* PIC32 UART registers.
*/
struct uartreg {
volatile unsigned mode; /* Mode */
volatile unsigned modeclr;
volatile unsigned modeset;
volatile unsigned modeinv;
volatile unsigned sta; /* Status and control */
volatile unsigned staclr;
volatile unsigned staset;
volatile unsigned stainv;
volatile unsigned txreg; /* Transmit */
volatile unsigned unused1;
volatile unsigned unused2;
volatile unsigned unused3;
volatile unsigned rxreg; /* Receive */
volatile unsigned unused4;
volatile unsigned unused5;
volatile unsigned unused6;
volatile unsigned brg; /* Baud rate */
volatile unsigned brgclr;
volatile unsigned brgset;
volatile unsigned brginv;
};
static struct uartreg *const uart[NUART] = {
(struct uartreg*) &U1MODE,
(struct uartreg*) &U2MODE,
(struct uartreg*) &U3MODE,
(struct uartreg*) &U4MODE,
(struct uartreg*) &U5MODE,
(struct uartreg*) &U6MODE
};
/*
* UART interrupt numbers.
*/
struct uart_irq {
int er;
int rx;
int tx;
};
static const struct uart_irq uirq[NUART] = {
{ PIC32_IRQ_U1E, PIC32_IRQ_U1RX, PIC32_IRQ_U1TX },
{ PIC32_IRQ_U2E, PIC32_IRQ_U2RX, PIC32_IRQ_U2TX },
{ PIC32_IRQ_U3E, PIC32_IRQ_U3RX, PIC32_IRQ_U3TX },
{ PIC32_IRQ_U4E, PIC32_IRQ_U4RX, PIC32_IRQ_U4TX },
{ PIC32_IRQ_U5E, PIC32_IRQ_U5RX, PIC32_IRQ_U5TX },
{ PIC32_IRQ_U6E, PIC32_IRQ_U6RX, PIC32_IRQ_U6TX },
};
struct tty uartttys[NUART];
static unsigned speed_bps [NSPEEDS] = {
0, 50, 75, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 500000, 576000, 921600, 1000000, 1152000, 1500000,
2000000, 2500000, 3000000, 3500000, 4000000
};
void cnstart (struct tty *tp);
/*
* Setup UART registers.
* Compute the divisor for 115.2 kbaud.
*/
void uartinit(int unit)
{
register struct uartreg *reg;
if (unit >= NUART)
return;
switch(unit) {
case 0:
#ifdef UART1_ENA_PORT
/* Enable UART1 phy - pin is assumed to be active low */
TRIS_CLR(UART1_ENA_PORT) = 1 << UART1_ENA_PIN;
LAT_CLR(UART1_ENA_PORT) = 1 << UART1_ENA_PIN;
udelay(2500);
#endif
break;
case 1:
#ifdef UART2_ENA_PORT
/* Enable UART2 phy - pin is assumed to be active low */
TRIS_CLR(UART2_ENA_PORT) = 1 << UART2_ENA_PIN;
LAT_CLR(UART2_ENA_PORT) = 1 << UART2_ENA_PIN;
udelay(2500);
#endif
break;
case 2:
#ifdef UART3_ENA_PORT
/* Enable UART3 phy - pin is assumed to be active low */
TRIS_CLR(UART3_ENA_PORT) = 1 << UART3_ENA_PIN;
LAT_CLR(UART3_ENA_PORT) = 1 << UART3_ENA_PIN;
udelay(2500);
#endif
break;
case 3:
#ifdef UART4_ENA_PORT
/* Enable UART4 phy - pin is assumed to be active low */
TRIS_CLR(UART4_ENA_PORT) = 1 << UART4_ENA_PIN;
LAT_CLR(UART4_ENA_PORT) = 1 << UART4_ENA_PIN;
udelay(2500);
#endif
break;
case 4:
#ifdef UART5_ENA_PORT
/* Enable UART5 phy - pin is assumed to be active low */
TRIS_CLR(UART5_ENA_PORT) = 1 << UART5_ENA_PIN;
LAT_CLR(UART5_ENA_PORT) = 1 << UART5_ENA_PIN;
udelay(2500);
#endif
break;
case 5:
#ifdef UART6_ENA_PORT
/* Enable UART6 phy - pin is assumed to be active low */
TRIS_CLR(UART6_ENA_PORT) = 1 << UART6_ENA_PIN;
LAT_CLR(UART6_ENA_PORT) = 1 << UART6_ENA_PIN;
udelay(2500);
#endif
break;
}
reg = uart[unit];
reg->brg = PIC32_BRG_BAUD (BUS_KHZ * 1000, UART_BAUD);
reg->sta = 0;
reg->mode =
PIC32_UMODE_PDSEL_8NPAR | /* 8-bit data, no parity */
PIC32_UMODE_ON; /* UART Enable */
reg->staset =
PIC32_USTA_URXEN | /* Receiver Enable */
PIC32_USTA_UTXEN; /* Transmit Enable */
}
int uartopen(dev_t dev, int flag, int mode)
{
register struct uartreg *reg;
register struct tty *tp;
register int unit = minor(dev);
if (unit >= NUART)
return (ENXIO);
tp = &uartttys[unit];
if (! tp->t_addr)
return (ENXIO);
reg = (struct uartreg*) tp->t_addr;
tp->t_oproc = uartstart;
if ((tp->t_state & TS_ISOPEN) == 0) {
if (tp->t_ispeed == 0) {
tp->t_ispeed = BBAUD(UART_BAUD);
tp->t_ospeed = BBAUD(UART_BAUD);
}
ttychars(tp);
tp->t_state = TS_ISOPEN | TS_CARR_ON;
tp->t_flags = ECHO | XTABS | CRMOD | CRTBS | CRTERA | CTLECH | CRTKIL;
}
if ((tp->t_state & TS_XCLUDE) && u.u_uid != 0)
return (EBUSY);
reg->sta = 0;
reg->brg = PIC32_BRG_BAUD (BUS_KHZ * 1000, speed_bps [tp->t_ospeed]);
reg->mode = PIC32_UMODE_PDSEL_8NPAR |
PIC32_UMODE_ON;
reg->staset = PIC32_USTA_URXEN | PIC32_USTA_UTXEN;
/* Enable receive interrupt. */
if (uirq[unit].rx < 32) {
IECSET(0) = 1 << uirq[unit].rx;
} else if (uirq[unit].rx < 64) {
IECSET(1) = 1 << (uirq[unit].rx-32);
} else {
IECSET(2) = 1 << (uirq[unit].rx-64);
}
return ttyopen(dev, tp);
}
/*ARGSUSED*/
int
uartclose (dev_t dev, int flag, int mode)
{
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
if (! tp->t_addr)
return ENODEV;
ttywflush(tp);
ttyclose(tp);
return(0);
}
/*ARGSUSED*/
int
uartread (dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
if (! tp->t_addr)
return ENODEV;
return ttread(tp, uio, flag);
}
/*ARGSUSED*/
int
uartwrite (dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
if (! tp->t_addr)
return ENODEV;
return ttwrite(tp, uio, flag);
}
int
uartselect (dev, rw)
register dev_t dev;
int rw;
{
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
if (! tp->t_addr)
return ENODEV;
return (ttyselect (tp, rw));
}
/*ARGSUSED*/
int
uartioctl (dev, cmd, addr, flag)
dev_t dev;
register u_int cmd;
caddr_t addr;
{
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
register int error;
if (! tp->t_addr)
return ENODEV;
error = ttioctl(tp, cmd, addr, flag);
if (error < 0)
error = ENOTTY;
return (error);
}
void
uartintr (dev)
dev_t dev;
{
register int c;
register int unit = minor(dev);
register struct tty *tp = &uartttys[unit];
register struct uartreg *reg = (struct uartreg *)tp->t_addr;
if (! tp->t_addr)
return;
/* Receive */
while (reg->sta & PIC32_USTA_URXDA) {
c = reg->rxreg;
ttyinput(c, tp);
}
if (reg->sta & PIC32_USTA_OERR)
reg->staclr = PIC32_USTA_OERR;
if (uirq[unit].rx < 32) {
IFSCLR(0) = (1 << uirq[unit].rx) | (1 << uirq[unit].er);
} else if (uirq[unit].rx < 64) {
IFSCLR(1) = (1 << (uirq[unit].rx-32)) | (1 << (uirq[unit].er-32));
} else {
IFSCLR(2) = (1 << (uirq[unit].rx-64)) | (1 << (uirq[unit].er-64));
}
/* Transmit */
if (reg->sta & PIC32_USTA_TRMT) {
led_control (LED_TTY, 0);
if (uirq[unit].tx < 32) {
IECCLR(0) = 1 << uirq[unit].tx;
IFSCLR(0) = 1 << uirq[unit].tx;
} else if (uirq[unit].tx < 64) {
IECCLR(1) = 1 << (uirq[unit].tx - 32);
IFSCLR(1) = 1 << (uirq[unit].tx - 32);
} else {
IECCLR(2) = 1 << (uirq[unit].tx - 64);
IFSCLR(2) = 1 << (uirq[unit].tx - 64);
}
if (tp->t_state & TS_BUSY) {
tp->t_state &= ~TS_BUSY;
ttstart(tp);
}
}
}
void uartstart (register struct tty *tp)
{
register struct uartreg *reg = (struct uartreg*) tp->t_addr;
register int c, s;
register int unit = minor(tp->t_dev);
if (! tp->t_addr)
return;
s = spltty();
if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
out: /* Disable transmit_interrupt. */
led_control (LED_TTY, 0);
splx (s);
return;
}
ttyowake(tp);
if (tp->t_outq.c_cc == 0)
goto out;
if (reg->sta & PIC32_USTA_TRMT) {
c = getc(&tp->t_outq);
reg->txreg = c & 0xff;
tp->t_state |= TS_BUSY;
}
/* Enable transmit interrupt. */
if (uirq[unit].tx < 32) {
IECSET(0) = 1 << uirq[unit].tx;
} else if (uirq[unit].tx < 64) {
IECSET(1) = 1 << (uirq[unit].tx - 32);
} else {
IECSET(2) = 1 << (uirq[unit].tx - 64);
}
led_control (LED_TTY, 1);
splx (s);
}
void uartputc(dev_t dev, char c)
{
int unit = minor(dev);
struct tty *tp = &uartttys[unit];
register struct uartreg *reg = uart[unit];
register int s, timo;
s = spltty();
again:
/*
* Try waiting for the console tty to come ready,
* otherwise give up after a reasonable time.
*/
timo = 30000;
while ((reg->sta & PIC32_USTA_TRMT) == 0)
if (--timo == 0)
break;
if (tp->t_state & TS_BUSY) {
uartintr (dev);
goto again;
}
led_control (LED_TTY, 1);
reg->txreg = c;
timo = 30000;
while ((reg->sta & PIC32_USTA_TRMT) == 0)
if (--timo == 0)
break;
/* Clear TX interrupt. */
if (uirq[unit].tx < 32) {
IECCLR(0) = 1 << uirq[unit].tx;
} else if (uirq[unit].tx < 64) {
IECCLR(1) = 1 << (uirq[unit].tx - 32);
} else {
IECCLR(2) = 1 << (uirq[unit].tx - 64);
}
led_control(LED_TTY, 0);
splx(s);
}
char uartgetc(dev_t dev)
{
int unit = minor(dev);
register struct uartreg *reg = uart[unit];
int s, c;
s = spltty();
for (;;) {
/* Wait for key pressed. */
if (reg->sta & PIC32_USTA_URXDA) {
c = reg->rxreg;
break;
}
}
if (uirq[unit].rx < 32) {
IFSCLR(0) = (1 << uirq[unit].rx) | (1 << uirq[unit].er);
} else if (uirq[unit].rx < 64) {
IFSCLR(1) = (1 << (uirq[unit].rx-32)) | (1 << (uirq[unit].er-32));
} else {
IFSCLR(2) = (1 << (uirq[unit].rx-64)) | (1 << (uirq[unit].er-64));
}
splx(s);
return (unsigned char) c;
}
/*
* Test to see if device is present.
* Return true if found and initialized ok.
*/
static int
uartprobe(config)
struct conf_device *config;
{
int unit = config->dev_unit - 1;
int is_console = (CONS_MAJOR == UART_MAJOR &&
CONS_MINOR == unit);
int rx, tx;
static const int rx_tab[NUART] = {
GPIO_PIN('D',2), /* U1RX: 64pin - RD2, 100pin - RF2 */
GPIO_PIN('F',4), /* U2RX */
GPIO_PIN('G',7), /* U3RX */
GPIO_PIN('D',9), /* U4RX: 64pin - RD9, 100pin - RD14 */
GPIO_PIN('B',8), /* U5RX: 64pin - RB8, 100pin - RF12 */
GPIO_PIN('G',9), /* U6RX */
};
static const int tx_tab[NUART] = {
GPIO_PIN('D',3), /* U1TX: 64pin - RD3, 100pin - RF8 */
GPIO_PIN('F',5), /* U2TX */
GPIO_PIN('G',8), /* U3TX */
GPIO_PIN('D',1), /* U4TX: 64pin - RD1, 100pin - RD15 */
GPIO_PIN('B',14), /* U5TX: 64pin - RB14, 100pin - RF13 */
GPIO_PIN('G',6), /* U6TX */
};
if (unit < 0 || unit >= NUART)
return 0;
rx = rx_tab[unit];
tx = tx_tab[unit];
if (cpu_pins > 64) {
/* Ports UART1, UART4 and UART5 have different pin assignments
* for 100-pin packages. */
switch (unit + 1) {
case 1:
rx = GPIO_PIN('F',2);
tx = GPIO_PIN('F',8);
break;
case 4:
rx = GPIO_PIN('D',14);
tx = GPIO_PIN('D',15);
break;
case 5:
rx = GPIO_PIN('F',12);
tx = GPIO_PIN('F',13);
break;
}
}
printf("uart%d: pins rx=R%c%d/tx=R%c%d, interrupts %u/%u/%u", unit+1,
gpio_portname(rx), gpio_pinno(rx),
gpio_portname(tx), gpio_pinno(tx),
uirq[unit].er, uirq[unit].rx, uirq[unit].tx);
if (is_console)
printf(", console");
printf("\n");
/* Initialize the device. */
uartttys[unit].t_addr = (caddr_t) uart[unit];
if (! is_console)
uartinit(unit);
return 1;
}
struct driver uartdriver = {
"uart", uartprobe,
};
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