/* * SMC1 raw console serial I/O. * * This driver is an example of `POLLING' or `INTERRUPT' input. * * To compile with interrupt-driven input, define M360_SMC1_INTERRUPT * in the make customization file for this bsp (gen68360.cfg). * * Author: * 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). * Copyright assigned to U.S. Government, 1994. * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * * http://www.OARcorp.com/rtems/license.html. * * $Id$ */ #include #include #include #include "m68360.h" #if (defined (M360_SMC1_INTERRUPT)) # define RXBUFSIZE 16 static void *smc1ttyp; #else # define RXBUFSIZE 1 #endif /* * I/O buffers and pointers to buffer descriptors */ static volatile char rxBuf[RXBUFSIZE]; static volatile m360BufferDescriptor_t *smcRxBd, *smcTxBd; /* * Device-specific routines */ #if (defined (M360_SMC1_INTERRUPT)) static rtems_isr smc1InterruptHandler (rtems_vector_number v) { /* * Buffer received? */ if (m360.smc1.smce & 0x1) { m360.smc1.smce = 0x1; while ((smcRxBd->status & M360_BD_EMPTY) == 0) { rtems_termios_enqueue_raw_characters (smc1ttyp, (char *)smcRxBd->buffer, smcRxBd->length); smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP | M360_BD_INTERRUPT; } } /* * Buffer transmitted? */ if (m360.smc1.smce & 0x2) { m360.smc1.smce = 0x2; if ((smcTxBd->status & M360_BD_READY) == 0) rtems_termios_dequeue_characters (smc1ttyp, smcTxBd->length); } m360.cisr = 1UL << 4; /* Clear SMC1 interrupt-in-service bit */ } #endif static void smc1Initialize (void) { /* * Allocate buffer descriptors */ smcRxBd = M360AllocateBufferDescriptors (1); smcTxBd = 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 *)smcRxBd - (char *)&m360; m360.smc1p.tbase = (char *)smcTxBd - (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 = RXBUFSIZE; /* * Set up SMC1 parameter RAM UART-specific parameters */ m360.smc1p.un.uart.max_idl = 10; m360.smc1p.un.uart.brklen = 0; m360.smc1p.un.uart.brkec = 0; m360.smc1p.un.uart.brkcr = 0; /* * Set up the Receive Buffer Descriptor */ smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP | M360_BD_INTERRUPT; smcRxBd->length = 0; smcRxBd->buffer = rxBuf; /* * Setup the Transmit Buffer Descriptor */ smcTxBd->status = M360_BD_WRAP; /* * 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; #if (defined (M360_SMC1_INTERRUPT)) { rtems_isr_entry old_handler; rtems_status_code sc; sc = rtems_interrupt_catch (smc1InterruptHandler, (m360.cicr & 0xE0) | 0x04, &old_handler); m360.smc1.smcm = 3; /* Enable SMC1 TX and RX interrupts */ m360.cimr |= 1UL << 4; /* Enable SMC1 interrupts */ } #endif } static int smc1Read (int minor) { unsigned char c; if (smcRxBd->status & M360_BD_EMPTY) return -1; c = rxBuf[0]; smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP; return c; } /* * Device-dependent write routine * Interrupt-driven devices: * Begin transmission of as many characters as possible (minimum is 1). * Polling devices: * Transmit all characters. */ static int smc1Write (int minor, const char *buf, int len) { #if (defined (M360_SMC1_INTERRUPT)) smcTxBd->buffer = (char *)buf; smcTxBd->length = len; smcTxBd->status = M360_BD_READY | M360_BD_WRAP | M360_BD_INTERRUPT; #else while (len--) { static char txBuf; while (smcTxBd->status & M360_BD_READY) continue; txBuf = *buf++; smcTxBd->buffer = &txBuf; smcTxBd->length = 1; smcTxBd->status = M360_BD_READY | M360_BD_WRAP; } #endif return 0; } /* *************** * BOILERPLATE * *************** */ /* * Reserve resources consumed by this driver */ void console_reserve_resources( rtems_configuration_table *configuration ) { rtems_termios_reserve_resources (configuration, 1); } /* * Initialize and register the device */ rtems_device_driver console_initialize( rtems_device_major_number major, rtems_device_minor_number minor, void *arg ) { rtems_status_code status; /* * Set up TERMIOS */ rtems_termios_initialize (); /* * Do device-specific initialization */ smc1Initialize (); /* * Register the device */ status = rtems_io_register_name ("/dev/console", major, 0); if (status != RTEMS_SUCCESSFUL) rtems_fatal_error_occurred (status); return RTEMS_SUCCESSFUL; } /* * Open the device */ rtems_device_driver console_open( rtems_device_major_number major, rtems_device_minor_number minor, void * arg ) { rtems_status_code sc; #if (defined (M360_SMC1_INTERRUPT)) rtems_libio_open_close_args_t *args = arg; sc = rtems_termios_open (major, minor, arg, NULL, NULL, NULL, smc1Write, 1); smc1ttyp = args->iop->data1; #else sc = rtems_termios_open (major, minor, arg, NULL, NULL, smc1Read, smc1Write, 0); #endif return sc; } /* * Close the device */ rtems_device_driver console_close( rtems_device_major_number major, rtems_device_minor_number minor, void * arg ) { return rtems_termios_close (arg); } /* * Read from the device */ rtems_device_driver console_read( rtems_device_major_number major, rtems_device_minor_number minor, void * arg ) { return rtems_termios_read (arg); } /* * Write to the device */ rtems_device_driver console_write( rtems_device_major_number major, rtems_device_minor_number minor, void * arg ) { return rtems_termios_write (arg); } /* * Handle ioctl request. * Should set hardware line speed, bits/char, etc. */ rtems_device_driver console_control( rtems_device_major_number major, rtems_device_minor_number minor, void * arg ) { return rtems_termios_ioctl (arg); }