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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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 genarch
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief   NS 16550 serial port / keyboard driver.
  35.  */
  36.  
  37. #include <genarch/kbd/ns16550.h>
  38. #include <genarch/kbd/key.h>
  39. #include <genarch/kbd/scanc.h>
  40. #include <genarch/kbd/scanc_sun.h>
  41. #include <arch/drivers/ns16550.h>
  42. #include <arch/interrupt.h>
  43. #include <cpu.h>
  44. #include <arch/asm.h>
  45. #include <arch.h>
  46. #include <typedefs.h>
  47. #include <console/chardev.h>
  48. #include <console/console.h>
  49. #include <interrupt.h>
  50. #include <sysinfo/sysinfo.h>
  51.  
  52. #define LSR_DATA_READY  0x01
  53.  
  54. /*
  55.  * These codes read from ns16550 data register are silently ignored.
  56.  */
  57. #define IGNORE_CODE 0x7f        /* all keys up */
  58.  
  59. static void ns16550_suspend(chardev_t *);
  60. static void ns16550_resume(chardev_t *);
  61.  
  62. chardev_t kbrd;
  63. static chardev_operations_t ops = {
  64.     .suspend = ns16550_suspend,
  65.     .resume = ns16550_resume,
  66.     .read = key_read
  67. };
  68.  
  69. void ns16550_interrupt(int n, istate_t *istate);
  70. void ns16550_wait(void);
  71.  
  72. /** Initialize keyboard and service interrupts using kernel routine */
  73. void ns16550_grab(void)
  74. {
  75.     /* TODO */
  76. }
  77.  
  78. /** Resume the former interrupt vector */
  79. void ns16550_release(void)
  80. {
  81.     /* TODO */
  82. }
  83.  
  84. /** Initialize ns16550. */
  85. void ns16550_init(void)
  86. {
  87.     ns16550_grab();
  88.     chardev_initialize("ns16550_kbd", &kbrd, &ops);
  89.     stdin = &kbrd;
  90.    
  91.     sysinfo_set_item_val("kbd", NULL, true);
  92.     sysinfo_set_item_val("kbd.irq", NULL, 0);
  93.     sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address);
  94. }
  95.  
  96. /** Process ns16550 interrupt.
  97.  *
  98.  * @param n Interrupt vector.
  99.  * @param istate Interrupted state.
  100.  */
  101. void ns16550_interrupt(int n, istate_t *istate)
  102. {
  103.     /* TODO */
  104. }
  105.  
  106. /** Wait until the controller reads its data. */
  107. void ns16550_wait(void)
  108. {
  109. }
  110.  
  111. /* Called from getc(). */
  112. void ns16550_resume(chardev_t *d)
  113. {
  114. }
  115.  
  116. /* Called from getc(). */
  117. void ns16550_suspend(chardev_t *d)
  118. {
  119. }
  120.  
  121. char key_read(chardev_t *d)
  122. {
  123.     char ch;   
  124.  
  125.     while(!(ch = active_read_buff_read())) {
  126.         uint8_t x;
  127.         while (!(ns16550_lsr_read() & LSR_DATA_READY))
  128.             ;
  129.         x = ns16550_rbr_read();
  130.         if (x != IGNORE_CODE) {
  131.             if (x & KEY_RELEASE)
  132.                 key_released(x ^ KEY_RELEASE);
  133.             else
  134.                 active_read_key_pressed(x);
  135.         }
  136.     }
  137.     return ch;
  138. }
  139.  
  140. /** Poll for key press and release events.
  141.  *
  142.  * This function can be used to implement keyboard polling.
  143.  */
  144. void ns16550_poll(void)
  145. {
  146.     uint8_t x;
  147.  
  148.     while (((x = ns16550_lsr_read() & LSR_DATA_READY))) {
  149.         x = ns16550_rbr_read();
  150.         if (x != IGNORE_CODE) {
  151.             if (x & KEY_RELEASE)
  152.                 key_released(x ^ KEY_RELEASE);
  153.             else
  154.                 key_pressed(x);
  155.         }
  156.     }
  157. }
  158.  
  159. /** @}
  160.  */
  161.