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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   i8042 processor driver.
  35.  *
  36.  * It takes care of low-level keyboard functions.
  37.  */
  38.  
  39. #include <genarch/kbd/i8042.h>
  40. #include <arch/drivers/kbd.h>
  41. #include <genarch/kbd/key.h>
  42. #include <genarch/kbd/scanc.h>
  43. #include <genarch/kbd/scanc_pc.h>
  44. #include <genarch/drivers/legacy/ia32/io.h>
  45. #include <cpu.h>
  46. #include <arch/asm.h>
  47. #include <arch.h>
  48. #include <console/chardev.h>
  49. #include <console/console.h>
  50. #include <interrupt.h>
  51. #include <sysinfo/sysinfo.h>
  52. #include <ipc/irq.h>
  53.  
  54. i8042_instance_t lgcy_i8042_instance = {
  55.     .i8042 = (i8042_t *) I8042_BASE,
  56. };
  57.  
  58. /* Keyboard commands. */
  59. #define KBD_ENABLE  0xf4
  60. #define KBD_DISABLE 0xf5
  61. #define KBD_ACK     0xfa
  62.  
  63. /*
  64.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  65.  *     placed in 8042 command register. Format:
  66.  *
  67.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  68.  *     | | | | | | | `---- 1=enable output register full interrupt
  69.  *     | | | | | | `----- should be 0
  70.  *     | | | | | `------ 1=set status register system, 0=clear
  71.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  72.  *     | | | `-------- disable keyboard I/O by driving clock line low
  73.  *     | | `--------- disable auxiliary device, drives clock line low
  74.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  75.  *     `----------- reserved, should be 0
  76.  */
  77.  
  78. #define i8042_SET_COMMAND   0x60
  79. #define i8042_COMMAND       0x69
  80.  
  81. #define i8042_BUFFER_FULL_MASK  0x01
  82. #define i8042_WAIT_MASK         0x02
  83. #define i8042_MOUSE_DATA        0x20
  84.  
  85. static void i8042_suspend(chardev_t *);
  86. static void i8042_resume(chardev_t *);
  87.  
  88. static chardev_operations_t ops = {
  89.     .suspend = i8042_suspend,
  90.     .resume = i8042_resume,
  91. };
  92.  
  93. /** Structure for i8042's IRQ. */
  94. static irq_t i8042_kbd_irq;
  95. static irq_t i8042_mouse_irq;
  96.  
  97. static irq_ownership_t i8042_claim(irq_t *irq)
  98. {
  99.     i8042_instance_t *i8042_instance = irq->instance;
  100.     i8042_t *dev = i8042_instance->i8042;
  101.     if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  102.         return IRQ_ACCEPT;
  103.     else
  104.         return IRQ_DECLINE;
  105. }
  106.  
  107. static void i8042_irq_handler(irq_t *irq)
  108. {
  109.     i8042_instance_t *instance = irq->instance;
  110.     i8042_t *dev = instance->i8042;
  111.  
  112.     uint8_t data;
  113.     uint8_t status;
  114.        
  115.     if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
  116.         data = pio_read_8(&dev->data);
  117.            
  118.         if ((status & i8042_MOUSE_DATA))
  119.             return;
  120.  
  121.         if (data & KEY_RELEASE)
  122.             key_released(data ^ KEY_RELEASE);
  123.         else
  124.             key_pressed(data);
  125.     }
  126. }
  127.  
  128. /** Initialize i8042. */
  129. void
  130. i8042_init(devno_t kbd_devno, inr_t kbd_inr, devno_t mouse_devno,
  131.     inr_t mouse_inr)
  132. {
  133.     i8042_t *dev = lgcy_i8042_instance.i8042;
  134.  
  135.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  136.     stdin = &kbrd;
  137.    
  138.     irq_initialize(&i8042_kbd_irq);
  139.     i8042_kbd_irq.devno = kbd_devno;
  140.     i8042_kbd_irq.inr = kbd_inr;
  141.     i8042_kbd_irq.claim = i8042_claim;
  142.     i8042_kbd_irq.handler = i8042_irq_handler;
  143.     i8042_kbd_irq.instance = &lgcy_i8042_instance;
  144.     irq_register(&i8042_kbd_irq);
  145.    
  146.     irq_initialize(&i8042_mouse_irq);
  147.     i8042_mouse_irq.devno = mouse_devno;
  148.     i8042_mouse_irq.inr = mouse_inr;
  149.     i8042_mouse_irq.claim = i8042_claim;
  150.     i8042_mouse_irq.handler = i8042_irq_handler;
  151.     i8042_mouse_irq.instance = &lgcy_i8042_instance;
  152.     irq_register(&i8042_mouse_irq);
  153.    
  154.     trap_virtual_enable_irqs(1 << kbd_inr);
  155.     trap_virtual_enable_irqs(1 << mouse_inr);
  156.    
  157.     /*
  158.      * Clear input buffer.
  159.      * Number of iterations is limited to prevent infinite looping.
  160.      */
  161.     int i;
  162.     for (i = 0; (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) &&
  163.         i < 100; i++) {
  164.         (void) pio_read_8(&dev->data);
  165.     }
  166.    
  167.     sysinfo_set_item_val("kbd", NULL, true);
  168.     sysinfo_set_item_val("kbd.devno", NULL, kbd_devno);
  169.     sysinfo_set_item_val("kbd.inr", NULL, kbd_inr);
  170. #ifdef KBD_LEGACY
  171.     sysinfo_set_item_val("kbd.type", NULL, KBD_LEGACY);
  172. #endif
  173.     sysinfo_set_item_val("mouse", NULL, true);
  174.     sysinfo_set_item_val("mouse.devno", NULL, mouse_devno);
  175.     sysinfo_set_item_val("mouse.inr", NULL, mouse_inr);
  176. }
  177.  
  178. /* Called from getc(). */
  179. void i8042_resume(chardev_t *d)
  180. {
  181. }
  182.  
  183. /* Called from getc(). */
  184. void i8042_suspend(chardev_t *d)
  185. {
  186. }
  187.  
  188. /** @}
  189.  */
  190.