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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.     serial_t *sd = (serial_t *)d->data;
  42.  
  43.     if (ch == '\n')
  44.         serial_write(d, '\r');
  45.     /* Wait until transmit buffer empty */
  46.     while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
  47.         ;
  48.     SERIAL_WRITE(sd->port, ch);
  49. }
  50.  
  51. static void serial_enable(chardev_t *d)
  52. {
  53.     kb_enabled = true;
  54. }
  55.  
  56. static void serial_disable(chardev_t *d)
  57. {
  58.     kb_enabled = false;
  59. }
  60.  
  61. int serial_init(void)
  62. {
  63.     int i = 0;
  64.     if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
  65.         sconf[i].port = SERIAL_COM1;
  66.         sconf[i].irq = SERIAL_COM1_IRQ;
  67.         /* Enable interrupt on available data */
  68.         i++;
  69.     }
  70.     return i;
  71. }
  72.  
  73. /** Read character from serial port, wait until available */
  74. static char serial_do_read(chardev_t *dev)
  75. {
  76.     serial_t *sd = (serial_t *)dev->data;
  77.     char ch;
  78.  
  79.     while (!(SERIAL_READ_LSR(sd->port) & 1))
  80.         ;
  81.     ch = SERIAL_READ(sd->port);
  82.  
  83.     if (ch =='\r')
  84.         ch = '\n';
  85.     return ch;
  86. }
  87.  
  88.  
  89. /** Process keyboard interrupt. Does not work in simics? */
  90. static void serial_interrupt(int n, void *stack)
  91. {
  92.     serial_t *sd = (serial_t *)console.data;
  93.     char ch;
  94.  
  95.     if (!(SERIAL_READ_LSR(sd->port) & 1))
  96.         return;
  97.     ch = SERIAL_READ(sd->port);
  98.  
  99.     if (ch =='\r')
  100.         ch = '\n';
  101.     chardev_push_character(&console, ch);
  102. }
  103.  
  104.  
  105.  
  106. static chardev_operations_t serial_ops = {
  107.     .resume = serial_enable,
  108.     .suspend = serial_disable,
  109.     .write = serial_write,
  110.     .read = serial_do_read
  111. };
  112.  
  113. iroutine old_timer;
  114. /** Do polling on timer interrupt */
  115. static void timer_replace(int n, istate_t *istate)
  116. {
  117.     old_timer(n, istate);
  118.     serial_interrupt(n, istate);
  119. }
  120.  
  121. void serial_console(void)
  122. {
  123.     serial_t *sd = &sconf[0];
  124.  
  125.  
  126.     chardev_initialize("serial_console", &console, &serial_ops);
  127.     console.data = sd;
  128.     kb_enabled = true;
  129.  
  130. //  int_register(2, "serial_drvr", serial_interrupt);
  131.     /* I don't know why, but the serial interrupts simply
  132.      * don't work on simics
  133.      */
  134.     old_timer = int_register(TIMER_IRQ, "serial_drvr_poll", timer_replace);
  135.    
  136.     stdin = &console;
  137.     stdout = &console;
  138. }
  139.