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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.  
  53. /* Keyboard commands. */
  54. #define KBD_ENABLE  0xf4
  55. #define KBD_DISABLE 0xf5
  56. #define KBD_ACK     0xfa
  57.  
  58. /*
  59.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  60.  *     placed in 8042 command register. Format:
  61.  *
  62.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  63.  *     | | | | | | | `---- 1=enable output register full interrupt
  64.  *     | | | | | | `----- should be 0
  65.  *     | | | | | `------ 1=set status register system, 0=clear
  66.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  67.  *     | | | `-------- disable keyboard I/O by driving clock line low
  68.  *     | | `--------- disable auxiliary device, drives clock line low
  69.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  70.  *     `----------- reserved, should be 0
  71.  */
  72.  
  73. #define i8042_SET_COMMAND   0x60
  74. #define i8042_COMMAND       0x69
  75.  
  76. #define i8042_BUFFER_FULL_MASK  0x01
  77. #define i8042_WAIT_MASK     0x02
  78. #define i8042_MOUSE_DATA    0x20
  79.  
  80. static void i8042_suspend(chardev_t *);
  81. static void i8042_resume(chardev_t *);
  82.  
  83. static chardev_operations_t ops = {
  84.     .suspend = i8042_suspend,
  85.     .resume = i8042_resume,
  86. };
  87.  
  88. static irq_ownership_t i8042_claim(irq_t *irq)
  89. {
  90.     i8042_instance_t *i8042_instance = irq->instance;
  91.     i8042_t *dev = i8042_instance->i8042;
  92.     if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  93.         return IRQ_ACCEPT;
  94.     else
  95.         return IRQ_DECLINE;
  96. }
  97.  
  98. static void i8042_irq_handler(irq_t *irq)
  99. {
  100.     i8042_instance_t *instance = irq->instance;
  101.     i8042_t *dev = instance->i8042;
  102.  
  103.     uint8_t data;
  104.     uint8_t status;
  105.        
  106.     if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
  107.         data = pio_read_8(&dev->data);
  108.            
  109.         if ((status & i8042_MOUSE_DATA))
  110.             return;
  111.  
  112.         if (data & KEY_RELEASE)
  113.             key_released(data ^ KEY_RELEASE);
  114.         else
  115.             key_pressed(data);
  116.     }
  117. }
  118.  
  119. /** Initialize i8042. */
  120. bool
  121. i8042_init(i8042_t *dev, devno_t devno, inr_t inr)
  122. {
  123.     i8042_instance_t *instance;
  124.  
  125.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  126.     stdin = &kbrd;
  127.    
  128.     instance = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
  129.     if (!instance)
  130.         return false;
  131.    
  132.     instance->devno = devno;
  133.     instance->i8042 = dev;
  134.    
  135.     irq_initialize(&instance->irq);
  136.     instance->irq.devno = devno;
  137.     instance->irq.inr = inr;
  138.     instance->irq.claim = i8042_claim;
  139.     instance->irq.handler = i8042_irq_handler;
  140.     instance->irq.instance = instance;
  141.     irq_register(&instance->irq);
  142.    
  143.     trap_virtual_enable_irqs(1 << inr);
  144.    
  145.     /*
  146.      * Clear input buffer.
  147.      */
  148.     while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  149.         (void) pio_read_8(&dev->data);
  150.    
  151.     /*
  152.      * This is the necessary evil until the userspace driver is entirely
  153.      * self-sufficient.
  154.      */
  155.     sysinfo_set_item_val("kbd", NULL, true);
  156.     sysinfo_set_item_val("kbd.devno", NULL, devno);
  157.     sysinfo_set_item_val("kbd.inr", NULL, inr);
  158. #ifdef KBD_LEGACY
  159.     sysinfo_set_item_val("kbd.type", NULL, KBD_LEGACY);
  160. #endif
  161.  
  162.     return true;
  163. }
  164.  
  165. /* Called from getc(). */
  166. void i8042_resume(chardev_t *d)
  167. {
  168. }
  169.  
  170. /* Called from getc(). */
  171. void i8042_suspend(chardev_t *d)
  172. {
  173. }
  174.  
  175. /** @}
  176.  */
  177.