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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 <typedefs.h>
  48. #include <console/chardev.h>
  49. #include <console/console.h>
  50. #include <interrupt.h>
  51. #include <sysinfo/sysinfo.h>
  52. #include <ddi/irq.h>
  53.  
  54. /* Keyboard commands. */
  55. #define KBD_ENABLE  0xf4
  56. #define KBD_DISABLE 0xf5
  57. #define KBD_ACK     0xfa
  58.  
  59. /*
  60.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  61.  *     placed in 8042 command register. Format:
  62.  *
  63.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  64.  *     | | | | | | | `---- 1=enable output register full interrupt
  65.  *     | | | | | | `----- should be 0
  66.  *     | | | | | `------ 1=set status register system, 0=clear
  67.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  68.  *     | | | `-------- disable keyboard I/O by driving clock line low
  69.  *     | | `--------- disable auxiliary device, drives clock line low
  70.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  71.  *     `----------- reserved, should be 0
  72.  */
  73.  
  74. #define i8042_SET_COMMAND   0x60
  75. #define i8042_COMMAND       0x69
  76.  
  77. #define i8042_BUFFER_FULL_MASK  0x01
  78. #define i8042_WAIT_MASK     0x02
  79. #define i8042_MOUSE_DATA        0x20
  80.  
  81. static void i8042_suspend(chardev_t *);
  82. static void i8042_resume(chardev_t *);
  83.  
  84. static chardev_operations_t ops = {
  85.     .suspend = i8042_suspend,
  86.     .resume = i8042_resume,
  87.     .read = i8042_key_read
  88. };
  89.  
  90. /** Structure for i8042's IRQ. */
  91. static irq_t i8042_irq;
  92.  
  93. /** Wait until the controller reads its data. */
  94. static void i8042_wait(void) {
  95.     while (i8042_status_read() & i8042_WAIT_MASK) {
  96.         /* wait */
  97.     }
  98. }
  99.  
  100. void i8042_grab(void)
  101. {
  102.     ipl_t ipl = interrupts_disable();
  103.    
  104.     i8042_wait();
  105.     i8042_command_write(i8042_SET_COMMAND);
  106.     i8042_wait();
  107.     i8042_data_write(i8042_COMMAND);
  108.     i8042_wait();
  109.  
  110.     spinlock_lock(&i8042_irq.lock);
  111.     i8042_irq.notif_cfg.notify = false;
  112.     spinlock_unlock(&i8042_irq.lock);
  113.     interrupts_restore(ipl);
  114. }
  115.  
  116. void i8042_release(void)
  117. {
  118.     ipl_t ipl = interrupts_disable();
  119.     spinlock_lock(&i8042_irq.lock);
  120.     if (i8042_irq.notif_cfg.answerbox)
  121.         i8042_irq.notif_cfg.notify = true;
  122.     spinlock_unlock(&i8042_irq.lock);
  123.     interrupts_restore(ipl);
  124. }
  125.  
  126. static irq_ownership_t i8042_claim(void)
  127. {
  128.     return IRQ_ACCEPT;
  129. }
  130.  
  131. static void i8042_irq_handler(irq_t *irq, void *arg, ...)
  132. {
  133.     if (irq->notif_cfg.notify && irq->notif_cfg.answerbox)
  134.         ipc_irq_send_notif(irq);
  135.     else {
  136.         uint8_t x;
  137.         uint8_t status;
  138.        
  139.         while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {
  140.             x = i8042_data_read();
  141.            
  142.             if ((status & i8042_MOUSE_DATA))
  143.                 continue;
  144.            
  145.             if (x & KEY_RELEASE)
  146.                 key_released(x ^ KEY_RELEASE);
  147.             else
  148.                 key_pressed(x);
  149.         }
  150.     }
  151. }
  152.  
  153. /** Initialize i8042. */
  154. void i8042_init(devno_t devno, inr_t inr)
  155. {
  156.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  157.     stdin = &kbrd;
  158.    
  159.     irq_initialize(&i8042_irq);
  160.     i8042_irq.devno = devno;
  161.     i8042_irq.inr = inr;
  162.     i8042_irq.claim = i8042_claim;
  163.     i8042_irq.handler = i8042_irq_handler;
  164.     irq_register(&i8042_irq);
  165.    
  166.     trap_virtual_enable_irqs(1 << inr);
  167.    
  168.     /*
  169.      * Clear input buffer.
  170.      * Number of iterations is limited to prevent infinite looping.
  171.      */
  172.     int i;
  173.     for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
  174.         i8042_data_read();
  175.     }
  176.    
  177.     sysinfo_set_item_val("kbd", NULL, true);
  178.     sysinfo_set_item_val("kbd.devno", NULL, devno);
  179.     sysinfo_set_item_val("kbd.inr", NULL, inr);
  180.    
  181.     i8042_grab();
  182. }
  183.  
  184. /* Called from getc(). */
  185. void i8042_resume(chardev_t *d)
  186. {
  187. }
  188.  
  189. /* Called from getc(). */
  190. void i8042_suspend(chardev_t *d)
  191. {
  192. }
  193.  
  194. char i8042_key_read(chardev_t *d)
  195. {
  196.     char ch;   
  197.  
  198.     while(!(ch = active_read_buff_read())) {
  199.         uint8_t x;
  200.         while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
  201.             ;
  202.         x = i8042_data_read();
  203.         if (x & KEY_RELEASE)
  204.             key_released(x ^ KEY_RELEASE);
  205.         else
  206.             active_read_key_pressed(x);
  207.     }
  208.     return ch;
  209. }
  210.  
  211. /** Poll for key press and release events.
  212.  *
  213.  * This function can be used to implement keyboard polling.
  214.  */
  215. void i8042_poll(void)
  216. {
  217.     uint8_t x;
  218.  
  219.     while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
  220.         x = i8042_data_read();
  221.         if (x & KEY_RELEASE)
  222.             key_released(x ^ KEY_RELEASE);
  223.         else
  224.             key_pressed(x);
  225.     }
  226. }
  227.  
  228. /** @}
  229.  */
  230.