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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.  /** @addtogroup mips32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <interrupt.h>
  36. #include <arch/cp0.h>
  37. #include <arch/drivers/serial.h>
  38. #include <console/chardev.h>
  39. #include <console/console.h>
  40.  
  41. static chardev_t console;
  42. static serial_t sconf[SERIAL_MAX];
  43. static bool kb_enabled;
  44.  
  45. static void serial_write(chardev_t *d, const char ch)
  46. {
  47.     serial_t *sd = (serial_t *)d->data;
  48.  
  49.     if (ch == '\n')
  50.         serial_write(d, '\r');
  51.     /* Wait until transmit buffer empty */
  52.     while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
  53.         ;
  54.     SERIAL_WRITE(sd->port, ch);
  55. }
  56.  
  57. static void serial_enable(chardev_t *d)
  58. {
  59.     kb_enabled = true;
  60. }
  61.  
  62. static void serial_disable(chardev_t *d)
  63. {
  64.     kb_enabled = false;
  65. }
  66.  
  67. int serial_init(void)
  68. {
  69.     int i = 0;
  70.     if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
  71.         sconf[i].port = SERIAL_COM1;
  72.         sconf[i].irq = SERIAL_COM1_IRQ;
  73.         /* Enable interrupt on available data */
  74.         i++;
  75.     }
  76.     return i;
  77. }
  78.  
  79. /** Read character from serial port, wait until available */
  80. static char serial_do_read(chardev_t *dev)
  81. {
  82.     serial_t *sd = (serial_t *)dev->data;
  83.     char ch;
  84.  
  85.     while (!(SERIAL_READ_LSR(sd->port) & 1))
  86.         ;
  87.     ch = SERIAL_READ(sd->port);
  88.  
  89.     if (ch =='\r')
  90.         ch = '\n';
  91.     return ch;
  92. }
  93.  
  94.  
  95. /** Process keyboard interrupt. Does not work in simics? */
  96. static void serial_interrupt(int n, void *stack)
  97. {
  98.     serial_t *sd = (serial_t *)console.data;
  99.     char ch;
  100.  
  101.     if (!(SERIAL_READ_LSR(sd->port) & 1))
  102.         return;
  103.     ch = SERIAL_READ(sd->port);
  104.  
  105.     if (ch =='\r')
  106.         ch = '\n';
  107.     chardev_push_character(&console, ch);
  108. }
  109.  
  110.  
  111.  
  112. static chardev_operations_t serial_ops = {
  113.     .resume = serial_enable,
  114.     .suspend = serial_disable,
  115.     .write = serial_write,
  116.     .read = serial_do_read
  117. };
  118.  
  119. iroutine old_timer;
  120. /** Do polling on timer interrupt */
  121. static void timer_replace(int n, istate_t *istate)
  122. {
  123.     old_timer(n, istate);
  124.     serial_interrupt(n, istate);
  125. }
  126.  
  127. void serial_console(void)
  128. {
  129.     serial_t *sd = &sconf[0];
  130.  
  131.  
  132.     chardev_initialize("serial_console", &console, &serial_ops);
  133.     console.data = sd;
  134.     kb_enabled = true;
  135.  
  136. //  int_register(2, "serial_drvr", serial_interrupt);
  137.     /* I don't know why, but the serial interrupts simply
  138.      * don't work on simics
  139.      */
  140.     old_timer = int_register(TIMER_IRQ, "serial_drvr_poll", timer_replace);
  141.    
  142.     stdin = &console;
  143.     stdout = &console;
  144. }
  145.  
  146.  /** @}
  147.  */
  148.  
  149.