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  1. /*
  2.  * Copyright (c) 2009 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.  
  52. /* Keyboard commands. */
  53. #define KBD_ENABLE  0xf4
  54. #define KBD_DISABLE 0xf5
  55. #define KBD_ACK     0xfa
  56.  
  57. /*
  58.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  59.  *     placed in 8042 command register. Format:
  60.  *
  61.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  62.  *     | | | | | | | `---- 1=enable output register full interrupt
  63.  *     | | | | | | `----- should be 0
  64.  *     | | | | | `------ 1=set status register system, 0=clear
  65.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  66.  *     | | | `-------- disable keyboard I/O by driving clock line low
  67.  *     | | `--------- disable auxiliary device, drives clock line low
  68.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  69.  *     `----------- reserved, should be 0
  70.  */
  71.  
  72. #define i8042_SET_COMMAND   0x60
  73. #define i8042_COMMAND       0x69
  74.  
  75. #define i8042_BUFFER_FULL_MASK  0x01
  76. #define i8042_WAIT_MASK     0x02
  77. #define i8042_MOUSE_DATA    0x20
  78.  
  79. static void i8042_suspend(chardev_t *);
  80. static void i8042_resume(chardev_t *);
  81.  
  82. static chardev_operations_t ops = {
  83.     .suspend = i8042_suspend,
  84.     .resume = i8042_resume,
  85. };
  86.  
  87. static irq_ownership_t i8042_claim(irq_t *irq)
  88. {
  89.     i8042_instance_t *i8042_instance = irq->instance;
  90.     i8042_t *dev = i8042_instance->i8042;
  91.     if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  92.         return IRQ_ACCEPT;
  93.     else
  94.         return IRQ_DECLINE;
  95. }
  96.  
  97. static void i8042_irq_handler(irq_t *irq)
  98. {
  99.     i8042_instance_t *instance = irq->instance;
  100.     i8042_t *dev = instance->i8042;
  101.  
  102.     uint8_t data;
  103.     uint8_t status;
  104.        
  105.     if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
  106.         data = pio_read_8(&dev->data);
  107.            
  108.         if ((status & i8042_MOUSE_DATA))
  109.             return;
  110.  
  111.         if (data & KEY_RELEASE)
  112.             key_released(data ^ KEY_RELEASE);
  113.         else
  114.             key_pressed(data);
  115.     }
  116. }
  117.  
  118. /** Initialize i8042. */
  119. bool
  120. i8042_init(i8042_t *dev, devno_t devno, inr_t inr)
  121. {
  122.     i8042_instance_t *instance;
  123.  
  124.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  125.     stdin = &kbrd;
  126.    
  127.     instance = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
  128.     if (!instance)
  129.         return false;
  130.    
  131.     instance->devno = devno;
  132.     instance->i8042 = dev;
  133.    
  134.     irq_initialize(&instance->irq);
  135.     instance->irq.devno = devno;
  136.     instance->irq.inr = inr;
  137.     instance->irq.claim = i8042_claim;
  138.     instance->irq.handler = i8042_irq_handler;
  139.     instance->irq.instance = instance;
  140.     irq_register(&instance->irq);
  141.    
  142.     trap_virtual_enable_irqs(1 << inr);
  143.    
  144.     /*
  145.      * Clear input buffer.
  146.      */
  147.     while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  148.         (void) pio_read_8(&dev->data);
  149.    
  150.     return true;
  151. }
  152.  
  153. /* Called from getc(). */
  154. void i8042_resume(chardev_t *d)
  155. {
  156. }
  157.  
  158. /* Called from getc(). */
  159. void i8042_suspend(chardev_t *d)
  160. {
  161. }
  162.  
  163. /** @}
  164.  */
  165.