/*
* Initialize SMC1 for console IO.
*
* Based on the `gen68302' board support package, and covered by the
* original distribution terms.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* $Id$
*/
/*
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*/
#define GEN68360_INIT
#include <bsp.h>
#include <rtems/libio.h>
#include "m68360.h"
/* console_initialize
*
* This routine initializes the console IO driver.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
/*
* I/O buffers can be in ordindary RAM
*/
static volatile char rxBuf, txBuf;
static volatile m360BufferDescriptor_t *consoleRxBd, *consoleTxBd;
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
/*
* Allocate buffer descriptors
*/
consoleRxBd = M360AllocateBufferDescriptors (1);
consoleTxBd = M360AllocateBufferDescriptors (1);
/*
* Configure port B pins to enable SMTXD1 and SMRXD1 pins
*/
m360.pbpar |= 0xC0;
m360.pbdir &= ~0xC0;
m360.pbodr &= ~0xC0;
/*
* Set up BRG1 (9,600 baud)
*/
m360.brgc1 = M360_BRG_RST;
m360.brgc1 = M360_BRG_EN | M360_BRG_EXTC_BRGCLK | M360_BRG_9600;
/*
* Put SMC1 in NMSI mode, connect SMC1 to BRG1
*/
m360.simode |= M360_SI_SMC1_BRG1;
/*
* Set up SMC1 parameter RAM common to all protocols
*/
m360.smc1p.rbase = (char *)consoleRxBd - (char *)&m360;
m360.smc1p.tbase = (char *)consoleTxBd - (char *)&m360;
m360.smc1p.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE;
m360.smc1p.tfcr = M360_TFCR_MOT | M360_TFCR_DMA_SPACE;
m360.smc1p.mrblr = 1;
/*
* Set up SMC1 parameter RAM UART-specific parameters
*/
m360.smc1p.un.uart.max_idl = 0;
m360.smc1p.un.uart.brklen = 0;
m360.smc1p.un.uart.brkec = 0;
m360.smc1p.un.uart.brkcr = 0;
/*
* Set up the Receive Buffer Descriptor
*/
consoleRxBd->status = M360_BD_EMPTY | M360_BD_WRAP;
consoleRxBd->length = 0;
consoleRxBd->buffer = &rxBuf;
/*
* Setup the Transmit Buffer Descriptor
*/
consoleTxBd->length = 1;
consoleTxBd->status = M360_BD_WRAP;
consoleTxBd->buffer = &txBuf;
/*
* Set up SMC1 general and protocol-specific mode registers
*/
m360.smc1.smce = ~0; /* Clear any pending events */
m360.smc1.smcm = 0; /* Mask all interrupt/event sources */
m360.smc1.smcmr = M360_SMCMR_CLEN(9) | M360_SMCMR_SM_UART;
/*
* Send "Init parameters" command
*/
M360ExecuteRISC (M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SMC1);
/*
* Enable receiver and transmitter
*/
m360.smc1.smcmr |= M360_SMCMR_TEN | M360_SMCMR_REN;
status = rtems_io_register_name(
"/dev/console",
major,
(rtems_device_minor_number)0);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
return RTEMS_SUCCESSFUL;
}
/* is_character_ready
*
* Check to see if a character is available on the console port. If so,
* then return a TRUE (along with the character). Otherwise return FALSE.
*
* Input parameters: pointer to location in which to return character
*
* Output parameters: character (if available)
*
* Return values: TRUE - character available
* FALSE - no character available
*/
rtems_boolean is_character_ready(
char *ch /* -> character */
)
{
if (consoleRxBd->status & M360_BD_EMPTY)
return FALSE;
*ch = rxBuf;
consoleRxBd->status = M360_BD_EMPTY | M360_BD_WRAP;
return TRUE;
}
/* inbyte
*
* Receive a character from the console port
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: character read
*/
char inbyte( void )
{
char ch;
while (is_character_ready (&ch) == FALSE)
continue;
return ch;
}
/* outbyte
*
* Transmit a character to the console serial port
*
* Input parameters:
* ch - character to be transmitted
*
* Output parameters: NONE
*/
void outbyte(
char ch
)
{
if (ch == '\n')
outbyte('\r');
while (consoleTxBd->status & M360_BD_READY)
continue;
txBuf = ch;
consoleTxBd->status = M360_BD_READY | M360_BD_WRAP;
}
/*
* Open entry point
*/
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* Close entry point
*/
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* read bytes from the serial port. We only have stdin.
*/
rtems_device_driver console_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_libio_rw_args_t *rw_args;
char *buffer;
int maximum;
int count = 0;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
buffer[ count ] = inbyte();
if (buffer[ count ] == '\n' || buffer[ count ] == '\r') {
buffer[ count++ ] = '\n';
buffer[ count ] = 0;
break;
}
}
rw_args->bytes_moved = count;
return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
}
/*
* write bytes to the serial port. Stdout and stderr are the same.
*/
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
int count;
int maximum;
rtems_libio_rw_args_t *rw_args;
char *buffer;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
if ( buffer[ count ] == '\n') {
outbyte('\r');
}
outbyte( buffer[ count ] );
}
rw_args->bytes_moved = maximum;
return 0;
}
/*
* IO Control entry point
*/
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
