/* * 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 #include #include "m68360.h" /* console_initialize * * This routine initializes the console IO driver. * * Input parameters: NONE * * Output parameters: NONE * * Return values: */ /* * Place buffer descriptors at end of User Data/BD space in dual-port RAM */ #define consoleRxBd ((volatile m360BufferDescriptor_t *)((char *)m360.dpram1 + \ (sizeof(m360.dpram2) - 2*sizeof(m360BufferDescriptor_t)))) #define consoleTxBd ((volatile m360BufferDescriptor_t *)((char *)m360.dpram1 + \ (sizeof(m360.dpram2) - sizeof(m360BufferDescriptor_t)))) /* * I/O buffers can be in ordindary RAM */ static volatile char rxBuf, txBuf; rtems_device_driver console_initialize( rtems_device_major_number major, rtems_device_minor_number minor, void *arg ) { rtems_status_code status; /* * 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 */ m360.cr = M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SMC1 | M360_CR_FLG; while (m360.cr & M360_CR_FLG) continue; /* * 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; }