/*
* General Serial I/O functions.
*
* This file contains the functions for performing serial I/O. The actual
* system calls (console_*) should be in the BSP part of the source tree.
* That way different BSPs can use whichever SCI they wish for /dev/console.
*
* On-chip resources used:
* resource minor note
* SCI1 0
* SCI2 1
*
*
* MPC5xx port sponsored by Defence Research and Development Canada - Suffield
* Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca)
*
* Derived from
* c/src/lib/libcpu/powerpc/mpc8xx/console_generic/console_generic.c:
* Author: Jay Monkman (jmonkman@frasca.com)
* Copyright (C) 1998 by Frasca International, Inc.
*
* Derived from c/src/lib/libbsp/m68k/gen360/console/console.c written by:
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
*
* Modifications by Darlene Stewart <Darlene.Stewart@iit.nrc.ca>
* and Charles-Antoine Gauthier <charles.gauthier@iit.nrc.ca>
* Copyright (c) 1999, National Research Council of Canada
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/bspIo.h> /* for printk */
#include <mpc5xx.h>
#include <mpc5xx/console.h>
#include <bsp/irq.h>
/*
* SCI port descriptor table.
*/
typedef struct
{
volatile m5xxSCIRegisters_t *regs; /* hardware registers */
struct rtems_termios_tty *ttyp; /* termios data for this port */
} sci_desc;
static sci_desc sci_descs[] = {
{ &imb.qsmcm.sci1, 0 }, /* SCI 1 */
{ &imb.qsmcm.sci2, 0 }, /* SCI 2 */
};
/*
* Number of SCI port initialization calls made so far. Used to avoid
* installing the common interrupt handler more than once.
*/
int init_calls = 0;
/*
* Default configuration.
*/
static struct termios default_termios = {
0, /* input mode flags */
0, /* output mode flags */
CS8 | CREAD | CLOCAL | B9600, /* control mode flags */
0, /* local mode flags */
0, /* line discipline */
{ 0 } /* control characters */
};
extern uint32_t bsp_clock_speed;
/*
* Termios callback functions
*/
int
m5xx_uart_firstOpen(
int major,
int minor,
void *arg
)
{
rtems_libio_open_close_args_t *args = arg;
sci_desc* desc = &sci_descs[minor];
struct rtems_termios_tty *tty = args->iop->data1;
desc->ttyp = tty; /* connect tty */
if ( tty->device.outputUsesInterrupts == TERMIOS_IRQ_DRIVEN)
desc->regs->sccr1 |= QSMCM_SCI_RIE; /* enable rx interrupt */
return RTEMS_SUCCESSFUL;
}
int
m5xx_uart_lastClose(
int major,
int minor,
void* arg
)
{
sci_desc* desc = &sci_descs[minor];
desc->regs->sccr1 &= ~(QSMCM_SCI_RIE | QSMCM_SCI_TIE); /* disable all */
desc->ttyp = NULL; /* disconnect tty */
return RTEMS_SUCCESSFUL;
}
int
m5xx_uart_pollRead(
int minor
)
{
volatile m5xxSCIRegisters_t *regs = sci_descs[minor].regs;
int c = -1;
if ( regs ) {
while ( (regs->scsr & QSMCM_SCI_RDRF) == 0 )
;
c = regs->scdr;
}
return c;
}
ssize_t m5xx_uart_write(
int minor,
const char *buf,
size_t len
)
{
volatile m5xxSCIRegisters_t *regs = sci_descs[minor].regs;
regs->scdr = *buf; /* start transmission */
regs->sccr1 |= QSMCM_SCI_TIE; /* enable interrupt */
return 0;
}
ssize_t m5xx_uart_pollWrite(
int minor,
const char *buf,
size_t len
)
{
volatile m5xxSCIRegisters_t *regs = sci_descs[minor].regs;
size_t retval = len;
while ( len-- ) {
while ( (regs->scsr & QSMCM_SCI_TDRE) == 0 )
;
regs->scdr = *buf++;
}
return retval;
}
int
m5xx_uart_setAttributes(
int minor,
const struct termios *t
)
{
uint16_t sccr0 = sci_descs[minor].regs->sccr0;
uint16_t sccr1 = sci_descs[minor].regs->sccr1;
int baud;
/*
* Check that port number is valid
*/
if ( (minor < SCI1_MINOR) || (minor > SCI2_MINOR) )
return RTEMS_INVALID_NUMBER;
/* Baud rate */
baud = rtems_termios_baud_to_number( t->c_cflag & CBAUD );
if (baud > 0) {
sccr0 &= ~QSMCM_SCI_BAUD(-1);
sccr0 |= QSMCM_SCI_BAUD((bsp_clock_speed + (16 * baud)) / (32 * baud));
}
/* Number of data bits -- not available with MPC5xx SCI */
switch ( t->c_cflag & CSIZE ) {
case CS5: break;
case CS6: break;
case CS7: break;
case CS8: break;
}
/* Stop bits -- not easily available with MPC5xx SCI */
if ( t->c_cflag & CSTOPB ) {
/* Two stop bits */
} else {
/* One stop bit */
}
/* Parity */
if ( t->c_cflag & PARENB )
sccr1 |= QSMCM_SCI_PE;
else
sccr1 &= ~QSMCM_SCI_PE;
if ( t->c_cflag & PARODD )
sccr1 |= QSMCM_SCI_PT;
else
sccr1 &= ~QSMCM_SCI_PT;
/* Transmitter and receiver enable */
sccr1 |= QSMCM_SCI_TE;
if ( t->c_cflag & CREAD )
sccr1 |= QSMCM_SCI_RE;
else
sccr1 &= ~QSMCM_SCI_RE;
/* Write hardware registers */
sci_descs[minor].regs->sccr0 = sccr0;
sci_descs[minor].regs->sccr1 = sccr1;
return RTEMS_SUCCESSFUL;
}
/*
* Interrupt handling.
*/
static void
m5xx_sci_interrupt_handler (rtems_irq_hdl_param unused)
{
int minor;
for ( minor = 0; minor < NUM_PORTS; minor++ ) {
sci_desc *desc = &sci_descs[minor];
int sccr1 = desc->regs->sccr1;
int scsr = desc->regs->scsr;
/*
* Character received?
*/
if ((sccr1 & QSMCM_SCI_RIE) && (scsr & QSMCM_SCI_RDRF)) {
char c = desc->regs->scdr;
rtems_termios_enqueue_raw_characters(desc->ttyp, &c, 1);
}
/*
* Transmitter empty?
*/
if ((sccr1 & QSMCM_SCI_TIE) && (scsr & QSMCM_SCI_TDRE)) {
desc->regs->sccr1 &= ~QSMCM_SCI_TIE;
rtems_termios_dequeue_characters (desc->ttyp, 1);
}
}
}
void m5xx_sci_nop(const rtems_irq_connect_data* ptr)
{
}
int m5xx_sci_isOn(const rtems_irq_connect_data* ptr)
{
return 1;
}
/*
* Basic initialization.
*/
void
m5xx_uart_initialize (int minor)
{
/*
* Check that minor number is valid.
*/
if ( (minor < SCI1_MINOR) || (minor > SCI2_MINOR) )
return;
/*
* Configure and enable receiver and transmitter.
*/
m5xx_uart_setAttributes(minor, &default_termios);
/*
* Connect interrupt if not yet done.
*/
if ( init_calls++ == 0 ) {
rtems_irq_connect_data irq_data;
irq_data.name = CPU_IRQ_SCI;
irq_data.hdl = m5xx_sci_interrupt_handler;
irq_data.on = m5xx_sci_nop; /* can't enable both channels here */
irq_data.off = m5xx_sci_nop; /* can't disable both channels here */
irq_data.isOn = m5xx_sci_isOn;
if (!CPU_install_rtems_irq_handler (&irq_data)) {
printk("Unable to connect SCI Irq handler\n");
rtems_fatal_error_occurred(1);
}
imb.qsmcm.qdsci_il = /* set interrupt level in port */
QSMCM_ILDSCI(CPU_irq_level_from_symbolic_name(CPU_IRQ_SCI));
}
}
