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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. #ifdef ia64
  41. #include <arch/drivers/kbd.h>
  42. #endif
  43. #include <genarch/kbd/key.h>
  44. #include <genarch/kbd/scanc.h>
  45. #include <genarch/kbd/scanc_pc.h>
  46. #include <arch/drivers/i8042.h>
  47. #include <cpu.h>
  48. #include <arch/asm.h>
  49. #include <arch.h>
  50. #include <console/chardev.h>
  51. #include <console/console.h>
  52. #include <interrupt.h>
  53. #include <sysinfo/sysinfo.h>
  54. #include <ipc/irq.h>
  55.  
  56. /* Keyboard commands. */
  57. #define KBD_ENABLE  0xf4
  58. #define KBD_DISABLE 0xf5
  59. #define KBD_ACK     0xfa
  60.  
  61. /*
  62.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  63.  *     placed in 8042 command register. Format:
  64.  *
  65.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  66.  *     | | | | | | | `---- 1=enable output register full interrupt
  67.  *     | | | | | | `----- should be 0
  68.  *     | | | | | `------ 1=set status register system, 0=clear
  69.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  70.  *     | | | `-------- disable keyboard I/O by driving clock line low
  71.  *     | | `--------- disable auxiliary device, drives clock line low
  72.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  73.  *     `----------- reserved, should be 0
  74.  */
  75.  
  76. #define i8042_SET_COMMAND   0x60
  77. #define i8042_COMMAND       0x69
  78.  
  79. #define i8042_BUFFER_FULL_MASK  0x01
  80. #define i8042_WAIT_MASK         0x02
  81. #define i8042_MOUSE_DATA        0x20
  82.  
  83. static void i8042_suspend(chardev_t *);
  84. static void i8042_resume(chardev_t *);
  85.  
  86. static chardev_operations_t ops = {
  87.     .suspend = i8042_suspend,
  88.     .resume = i8042_resume,
  89.     .read = i8042_key_read
  90. };
  91.  
  92. /** Structure for i8042's IRQ. */
  93. static irq_t i8042_kbd_irq;
  94. static irq_t i8042_mouse_irq;
  95.  
  96. void i8042_grab(void)
  97. {
  98.     ipl_t ipl = interrupts_disable();
  99.    
  100.     spinlock_lock(&i8042_kbd_irq.lock);
  101.     i8042_kbd_irq.notif_cfg.notify = false;
  102.     spinlock_unlock(&i8042_kbd_irq.lock);
  103.    
  104.     spinlock_lock(&i8042_mouse_irq.lock);
  105.     i8042_mouse_irq.notif_cfg.notify = false;
  106.     spinlock_unlock(&i8042_mouse_irq.lock);
  107.    
  108.     interrupts_restore(ipl);
  109. }
  110.  
  111. void i8042_release(void)
  112. {
  113.     ipl_t ipl = interrupts_disable();
  114.    
  115.     spinlock_lock(&i8042_kbd_irq.lock);
  116.     if (i8042_kbd_irq.notif_cfg.answerbox)
  117.         i8042_kbd_irq.notif_cfg.notify = true;
  118.     spinlock_unlock(&i8042_kbd_irq.lock);
  119.    
  120.     spinlock_lock(&i8042_mouse_irq.lock);
  121.     if (i8042_mouse_irq.notif_cfg.answerbox)
  122.         i8042_mouse_irq.notif_cfg.notify = true;
  123.     spinlock_unlock(&i8042_mouse_irq.lock);
  124.    
  125.     interrupts_restore(ipl);
  126. }
  127.  
  128. static irq_ownership_t i8042_claim(void)
  129. {
  130.     return IRQ_ACCEPT;
  131. }
  132.  
  133. static void i8042_irq_handler(irq_t *irq, void *arg, ...)
  134. {
  135.     if (irq->notif_cfg.notify && irq->notif_cfg.answerbox)
  136.         ipc_irq_send_notif(irq);
  137.     else {
  138.         uint8_t data;
  139.         uint8_t status;
  140.        
  141.         while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {
  142.             data = i8042_data_read();
  143.            
  144.             if ((status & i8042_MOUSE_DATA))
  145.                 continue;
  146.  
  147.             if (data & KEY_RELEASE)
  148.                 key_released(data ^ KEY_RELEASE);
  149.             else
  150.                 key_pressed(data);
  151.         }
  152.     }
  153. }
  154.  
  155. /** Initialize i8042. */
  156. void i8042_init(devno_t kbd_devno, inr_t kbd_inr, devno_t mouse_devno, inr_t mouse_inr)
  157. {
  158.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  159.     stdin = &kbrd;
  160.    
  161.     irq_initialize(&i8042_kbd_irq);
  162.     i8042_kbd_irq.devno = kbd_devno;
  163.     i8042_kbd_irq.inr = kbd_inr;
  164.     i8042_kbd_irq.claim = i8042_claim;
  165.     i8042_kbd_irq.handler = i8042_irq_handler;
  166.     irq_register(&i8042_kbd_irq);
  167.    
  168.     irq_initialize(&i8042_mouse_irq);
  169.     i8042_mouse_irq.devno = mouse_devno;
  170.     i8042_mouse_irq.inr = mouse_inr;
  171.     i8042_mouse_irq.claim = i8042_claim;
  172.     i8042_mouse_irq.handler = i8042_irq_handler;
  173.     irq_register(&i8042_mouse_irq);
  174. #ifndef ia64   
  175.     trap_virtual_enable_irqs(1 << kbd_inr);
  176.     trap_virtual_enable_irqs(1 << mouse_inr);
  177. #endif 
  178.     /*
  179.      * Clear input buffer.
  180.      * Number of iterations is limited to prevent infinite looping.
  181.      */
  182.     int i;
  183.     for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
  184.         i8042_data_read();
  185.     }
  186.    
  187.     sysinfo_set_item_val("kbd", NULL, true);
  188.     sysinfo_set_item_val("kbd.devno", NULL, kbd_devno);
  189.     sysinfo_set_item_val("kbd.inr", NULL, kbd_inr);
  190. #ifdef KBD_LEGACY
  191.     sysinfo_set_item_val("kbd.type", NULL, KBD_LEGACY);
  192. #endif 
  193.     sysinfo_set_item_val("mouse", NULL, true);
  194.     sysinfo_set_item_val("mouse.devno", NULL, mouse_devno);
  195.     sysinfo_set_item_val("mouse.inr", NULL, mouse_inr);
  196.    
  197.     i8042_grab();
  198. }
  199.  
  200. /* Called from getc(). */
  201. void i8042_resume(chardev_t *d)
  202. {
  203. }
  204.  
  205. /* Called from getc(). */
  206. void i8042_suspend(chardev_t *d)
  207. {
  208. }
  209.  
  210. char i8042_key_read(chardev_t *d)
  211. {
  212.     char ch;   
  213.  
  214.     while(!(ch = active_read_buff_read())) {
  215.         uint8_t x;
  216.         while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
  217.             ;
  218.         x = i8042_data_read();
  219.         if (x & KEY_RELEASE)
  220.             key_released(x ^ KEY_RELEASE);
  221.         else
  222.             active_read_key_pressed(x);
  223.     }
  224.     return ch;
  225. }
  226.  
  227. /** Poll for key press and release events.
  228.  *
  229.  * This function can be used to implement keyboard polling.
  230.  */
  231. void i8042_poll(void)
  232. {
  233.     uint8_t x;
  234.  
  235.     while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
  236.         x = i8042_data_read();
  237.         if (x & KEY_RELEASE)
  238.             key_released(x ^ KEY_RELEASE);
  239.         else
  240.             key_pressed(x);
  241.     }
  242. }
  243.  
  244. /** @}
  245.  */
  246.