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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 <genarch/kbd/key.h>
  41. #include <genarch/kbd/scanc.h>
  42. #include <genarch/kbd/scanc_pc.h>
  43. #include <arch/drivers/i8042.h>
  44. #include <cpu.h>
  45. #include <arch/asm.h>
  46. #include <arch.h>
  47. #include <console/chardev.h>
  48. #include <console/console.h>
  49. #include <interrupt.h>
  50. #include <sysinfo/sysinfo.h>
  51. #include <ipc/irq.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.     .read = i8042_key_read
  87. };
  88.  
  89. /** Structure for i8042's IRQ. */
  90. static irq_t i8042_kbd_irq;
  91. static irq_t i8042_mouse_irq;
  92.  
  93. void i8042_grab(void)
  94. {
  95.     ipl_t ipl = interrupts_disable();
  96.    
  97.     spinlock_lock(&i8042_kbd_irq.lock);
  98.     i8042_kbd_irq.notif_cfg.notify = false;
  99.     spinlock_unlock(&i8042_kbd_irq.lock);
  100.    
  101.     spinlock_lock(&i8042_mouse_irq.lock);
  102.     i8042_mouse_irq.notif_cfg.notify = false;
  103.     spinlock_unlock(&i8042_mouse_irq.lock);
  104.    
  105.     interrupts_restore(ipl);
  106. }
  107.  
  108. void i8042_release(void)
  109. {
  110.     ipl_t ipl = interrupts_disable();
  111.    
  112.     spinlock_lock(&i8042_kbd_irq.lock);
  113.     if (i8042_kbd_irq.notif_cfg.answerbox)
  114.         i8042_kbd_irq.notif_cfg.notify = true;
  115.     spinlock_unlock(&i8042_kbd_irq.lock);
  116.    
  117.     spinlock_lock(&i8042_mouse_irq.lock);
  118.     if (i8042_mouse_irq.notif_cfg.answerbox)
  119.         i8042_mouse_irq.notif_cfg.notify = true;
  120.     spinlock_unlock(&i8042_mouse_irq.lock);
  121.    
  122.     interrupts_restore(ipl);
  123. }
  124.  
  125. static irq_ownership_t i8042_claim(void)
  126. {
  127.     return IRQ_ACCEPT;
  128. }
  129.  
  130. static void i8042_irq_handler(irq_t *irq, void *arg, ...)
  131. {
  132.     if (irq->notif_cfg.notify && irq->notif_cfg.answerbox)
  133.         ipc_irq_send_notif(irq);
  134.     else {
  135.         uint8_t data;
  136.         uint8_t status;
  137.        
  138.         while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {
  139.             data = i8042_data_read();
  140.            
  141.             if ((status & i8042_MOUSE_DATA))
  142.                 continue;
  143.  
  144.             if (data & KEY_RELEASE)
  145.                 key_released(data ^ KEY_RELEASE);
  146.             else
  147.                 key_pressed(data);
  148.         }
  149.     }
  150. }
  151.  
  152. /** Initialize i8042. */
  153. void i8042_init(devno_t kbd_devno, inr_t kbd_inr, devno_t mouse_devno, inr_t mouse_inr)
  154. {
  155.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  156.     stdin = &kbrd;
  157.    
  158.     irq_initialize(&i8042_kbd_irq);
  159.     i8042_kbd_irq.devno = kbd_devno;
  160.     i8042_kbd_irq.inr = kbd_inr;
  161.     i8042_kbd_irq.claim = i8042_claim;
  162.     i8042_kbd_irq.handler = i8042_irq_handler;
  163.     irq_register(&i8042_kbd_irq);
  164.    
  165.     irq_initialize(&i8042_mouse_irq);
  166.     i8042_mouse_irq.devno = mouse_devno;
  167.     i8042_mouse_irq.inr = mouse_inr;
  168.     i8042_mouse_irq.claim = i8042_claim;
  169.     i8042_mouse_irq.handler = i8042_irq_handler;
  170.     irq_register(&i8042_mouse_irq);
  171.    
  172.     trap_virtual_enable_irqs(1 << kbd_inr);
  173.     trap_virtual_enable_irqs(1 << mouse_inr);
  174.    
  175.     /*
  176.      * Clear input buffer.
  177.      * Number of iterations is limited to prevent infinite looping.
  178.      */
  179.     int i;
  180.     for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
  181.         i8042_data_read();
  182.     }
  183.    
  184.     sysinfo_set_item_val("kbd", NULL, true);
  185.     sysinfo_set_item_val("kbd.devno", NULL, kbd_devno);
  186.     sysinfo_set_item_val("kbd.inr", NULL, kbd_inr);
  187.    
  188.     sysinfo_set_item_val("mouse", NULL, true);
  189.     sysinfo_set_item_val("mouse.devno", NULL, mouse_devno);
  190.     sysinfo_set_item_val("mouse.inr", NULL, mouse_inr);
  191.    
  192.     i8042_grab();
  193. }
  194.  
  195. /* Called from getc(). */
  196. void i8042_resume(chardev_t *d)
  197. {
  198. }
  199.  
  200. /* Called from getc(). */
  201. void i8042_suspend(chardev_t *d)
  202. {
  203. }
  204.  
  205. char i8042_key_read(chardev_t *d)
  206. {
  207.     char ch;   
  208.  
  209.     while(!(ch = active_read_buff_read())) {
  210.         uint8_t x;
  211.         while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
  212.             ;
  213.         x = i8042_data_read();
  214.         if (x & KEY_RELEASE)
  215.             key_released(x ^ KEY_RELEASE);
  216.         else
  217.             active_read_key_pressed(x);
  218.     }
  219.     return ch;
  220. }
  221.  
  222. /** Poll for key press and release events.
  223.  *
  224.  * This function can be used to implement keyboard polling.
  225.  */
  226. void i8042_poll(void)
  227. {
  228.     uint8_t x;
  229.  
  230.     while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
  231.         x = i8042_data_read();
  232.         if (x & KEY_RELEASE)
  233.             key_released(x ^ KEY_RELEASE);
  234.         else
  235.             key_pressed(x);
  236.     }
  237. }
  238.  
  239. /** @}
  240.  */
  241.