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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. #include <ddi/irq.h>
  41.  
  42. #define SERIAL_IRQ 2
  43.  
  44. static irq_t serial_irq;
  45. static chardev_t console;
  46. static serial_t sconf[SERIAL_MAX];
  47. static bool kb_enabled;
  48.  
  49. static void serial_write(chardev_t *d, const char ch)
  50. {
  51.     serial_t *sd = (serial_t *)d->data;
  52.  
  53.     if (ch == '\n')
  54.         serial_write(d, '\r');
  55.     /* Wait until transmit buffer empty */
  56.     while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
  57.         ;
  58.     SERIAL_WRITE(sd->port, ch);
  59. }
  60.  
  61. static void serial_enable(chardev_t *d)
  62. {
  63.     kb_enabled = true;
  64. }
  65.  
  66. static void serial_disable(chardev_t *d)
  67. {
  68.     kb_enabled = false;
  69. }
  70.  
  71. int serial_init(void)
  72. {
  73.     int i = 0;
  74.     if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
  75.         sconf[i].port = SERIAL_COM1;
  76.         sconf[i].irq = SERIAL_COM1_IRQ;
  77.         /* Enable interrupt on available data */
  78.         i++;
  79.     }
  80.     return i;
  81. }
  82.  
  83. /** Read character from serial port, wait until available */
  84. static char serial_do_read(chardev_t *dev)
  85. {
  86.     serial_t *sd = (serial_t *)dev->data;
  87.     char ch;
  88.  
  89.     while (!(SERIAL_READ_LSR(sd->port) & 1))
  90.         ;
  91.     ch = SERIAL_READ(sd->port);
  92.  
  93.     if (ch =='\r')
  94.         ch = '\n';
  95.     return ch;
  96. }
  97.  
  98. static void serial_handler(void)
  99. {
  100.     serial_t *sd = (serial_t *) console.data;
  101.     char ch;
  102.  
  103.     if (!(SERIAL_READ_LSR(sd->port) & 1))
  104.         return;
  105.     ch = SERIAL_READ(sd->port);
  106.  
  107.     if (ch =='\r')
  108.         ch = '\n';
  109.     chardev_push_character(&console, ch);
  110. }
  111.  
  112. /** Process keyboard interrupt. Does not work in simics? */
  113. static void serial_irq_handler(irq_t *irq, void *arg, ...)
  114. {
  115.     if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox))
  116.         ipc_irq_send_notif(irq);
  117.     else
  118.         serial_handler();
  119. }
  120.  
  121. static irq_ownership_t serial_claim(void)
  122. {
  123.     return IRQ_ACCEPT;
  124. }
  125.  
  126. static chardev_operations_t serial_ops = {
  127.     .resume = serial_enable,
  128.     .suspend = serial_disable,
  129.     .write = serial_write,
  130.     .read = serial_do_read
  131. };
  132.  
  133. void serial_console(devno_t devno)
  134. {
  135.     serial_t *sd = &sconf[0];
  136.  
  137.  
  138.     chardev_initialize("serial_console", &console, &serial_ops);
  139.     console.data = sd;
  140.     kb_enabled = true;
  141.    
  142.     irq_initialize(&serial_irq);
  143.     serial_irq.devno = devno;
  144.     serial_irq.inr = SERIAL_IRQ;
  145.     serial_irq.claim = serial_claim;
  146.     serial_irq.handler = serial_irq_handler;
  147.     irq_register(&serial_irq);
  148.  
  149.     /* I don't know why, but the serial interrupts simply
  150.      * don't work on simics
  151.      */
  152.     timer_fnc = &serial_handler;
  153.    
  154.     stdin = &console;
  155.     stdout = &console;
  156. }
  157.  
  158. /** @}
  159.  */
  160.