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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. i8042_instance_t lgcy_i8042_instance = {
  54.     .i8042 = (i8042_t *) I8042_BASE,
  55. };
  56.  
  57. /* Keyboard commands. */
  58. #define KBD_ENABLE  0xf4
  59. #define KBD_DISABLE 0xf5
  60. #define KBD_ACK     0xfa
  61.  
  62. /*
  63.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  64.  *     placed in 8042 command register. Format:
  65.  *
  66.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  67.  *     | | | | | | | `---- 1=enable output register full interrupt
  68.  *     | | | | | | `----- should be 0
  69.  *     | | | | | `------ 1=set status register system, 0=clear
  70.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  71.  *     | | | `-------- disable keyboard I/O by driving clock line low
  72.  *     | | `--------- disable auxiliary device, drives clock line low
  73.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  74.  *     `----------- reserved, should be 0
  75.  */
  76.  
  77. #define i8042_SET_COMMAND   0x60
  78. #define i8042_COMMAND       0x69
  79.  
  80. #define i8042_BUFFER_FULL_MASK  0x01
  81. #define i8042_WAIT_MASK         0x02
  82. #define i8042_MOUSE_DATA        0x20
  83.  
  84. static void i8042_suspend(chardev_t *);
  85. static void i8042_resume(chardev_t *);
  86.  
  87. static chardev_operations_t ops = {
  88.     .suspend = i8042_suspend,
  89.     .resume = i8042_resume,
  90. };
  91.  
  92. static irq_ownership_t i8042_claim(irq_t *irq)
  93. {
  94.     i8042_instance_t *i8042_instance = irq->instance;
  95.     i8042_t *dev = i8042_instance->i8042;
  96.     if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  97.         return IRQ_ACCEPT;
  98.     else
  99.         return IRQ_DECLINE;
  100. }
  101.  
  102. static void i8042_irq_handler(irq_t *irq)
  103. {
  104.     i8042_instance_t *instance = irq->instance;
  105.     i8042_t *dev = instance->i8042;
  106.  
  107.     uint8_t data;
  108.     uint8_t status;
  109.        
  110.     if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
  111.         data = pio_read_8(&dev->data);
  112.            
  113.         if ((status & i8042_MOUSE_DATA))
  114.             return;
  115.  
  116.         if (data & KEY_RELEASE)
  117.             key_released(data ^ KEY_RELEASE);
  118.         else
  119.             key_pressed(data);
  120.     }
  121. }
  122.  
  123. /** Initialize i8042. */
  124. bool
  125. i8042_init(i8042_t *dev, devno_t devno, inr_t inr)
  126. {
  127.     i8042_instance_t *instance;
  128.  
  129.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  130.     stdin = &kbrd;
  131.    
  132.     instance = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
  133.     if (!instance)
  134.         return false;
  135.    
  136.     instance->devno = devno;
  137.     instance->i8042 = dev;
  138.    
  139.     irq_initialize(&instance->irq);
  140.     instance->irq.devno = devno;
  141.     instance->irq.inr = inr;
  142.     instance->irq.claim = i8042_claim;
  143.     instance->irq.handler = i8042_irq_handler;
  144.     instance->irq.instance = instance;
  145.     irq_register(&instance->irq);
  146.    
  147.     trap_virtual_enable_irqs(1 << inr);
  148.    
  149.     /*
  150.      * Clear input buffer.
  151.      */
  152.     while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
  153.         (void) pio_read_8(&dev->data);
  154.    
  155.     /*
  156.      * This is the necessary evil until the userspace driver is entirely
  157.      * self-sufficient.
  158.      */
  159.     sysinfo_set_item_val("kbd", NULL, true);
  160.     sysinfo_set_item_val("kbd.devno", NULL, devno);
  161.     sysinfo_set_item_val("kbd.inr", NULL, inr);
  162. #ifdef KBD_LEGACY
  163.     sysinfo_set_item_val("kbd.type", NULL, KBD_LEGACY);
  164. #endif
  165.  
  166.     return true;
  167. }
  168.  
  169. /* Called from getc(). */
  170. void i8042_resume(chardev_t *d)
  171. {
  172. }
  173.  
  174. /* Called from getc(). */
  175. void i8042_suspend(chardev_t *d)
  176. {
  177. }
  178.  
  179. /** @}
  180.  */
  181.