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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <interrupt.h>
  30. #include <arch/cp0.h>
  31. #include <arch/drivers/serial.h>
  32. #include <console/chardev.h>
  33. #include <console/console.h>
  34.  
  35. static chardev_t console;
  36. static serial_t sconf[SERIAL_MAX];
  37. static bool kb_enabled;
  38.  
  39. static void serial_write(chardev_t *d, const char ch)
  40. {
  41.     int i;
  42.     serial_t *sd = (serial_t *)d->data;
  43.  
  44.     if (ch == '\n')
  45.         serial_write(d, '\r');
  46.     /* Wait until transmit buffer empty */
  47.     while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
  48.         ;
  49.     SERIAL_WRITE(sd->port, ch);
  50. }
  51.  
  52. static void serial_enable(chardev_t *d)
  53. {
  54.     kb_enabled = true;
  55. }
  56.  
  57. static void serial_disable(chardev_t *d)
  58. {
  59.     kb_enabled = false;
  60. }
  61.  
  62. int serial_init(void)
  63. {
  64.     int i = 0;
  65.     if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
  66.         sconf[i].port = SERIAL_COM1;
  67.         sconf[i].irq = SERIAL_COM1_IRQ;
  68.         /* Enable interrupt on available data */
  69.         i++;
  70.     }
  71.     return i;
  72. }
  73.  
  74. static chardev_operations_t serial_ops = {
  75.     .resume = serial_enable,
  76.     .suspend = serial_disable,
  77.     .write = serial_write
  78. };
  79.  
  80. /** Process keyboard interrupt. Does not work in simics? */
  81. static void serial_interrupt(int n, void *stack)
  82. {
  83.     serial_t *sd = (serial_t *)console.data;
  84.     char ch;
  85.  
  86.     if (!(SERIAL_READ_LSR(sd->port) & 1))
  87.         return;
  88.     ch = SERIAL_READ(sd->port);
  89.  
  90.     if (ch =='\r')
  91.         ch = '\n';
  92.     chardev_push_character(&console, ch);
  93. }
  94.  
  95.  
  96. iroutine old_timer;
  97. /** Do polling on timer interrupt */
  98. static void timer_replace(int n, void *stack)
  99. {
  100.     old_timer(n, stack);
  101.     serial_interrupt(n, stack);
  102. }
  103.  
  104. #include <print.h>
  105. chardev_t * serial_console(void)
  106. {
  107.     serial_t *sd = &sconf[0];
  108.  
  109.  
  110.     chardev_initialize("serial_console", &console, &serial_ops);
  111.     console.data = sd;
  112.     kb_enabled = true;
  113.  
  114. //  exc_register(2, "serial_drvr", serial_interrupt);
  115.     /* I don't know why, but the serial interrupts simply
  116.      * don't work on simics
  117.      */
  118.     old_timer = exc_register(TIMER_IRQ, "serial_drvr_poll", timer_replace);
  119.    
  120.  
  121.     return &console;
  122.    
  123. }
  124.