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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * Copyright (c) 2006 Josef Cejka
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup kbd_port
  31.  * @ingroup kbd
  32.  * @{
  33.  */
  34. /** @file
  35.  * @brief i8042 port driver.
  36.  */
  37.  
  38. #include <ddi.h>
  39. #include <libarch/ddi.h>
  40. #include <ipc/ipc.h>
  41. #include <async.h>
  42. #include <unistd.h>
  43. #include <sysinfo.h>
  44. #include <kbd_port.h>
  45. #include <kbd.h>
  46. #include "i8042.h"
  47.  
  48. /* Interesting bits for status register */
  49. #define i8042_OUTPUT_FULL  0x1
  50. #define i8042_INPUT_FULL   0x2
  51. #define i8042_MOUSE_DATA   0x20
  52.  
  53. /* Command constants */
  54. #define i8042_CMD_KBD 0x60
  55. #define i8042_CMD_MOUSE  0xd4
  56.  
  57. /* Keyboard cmd byte */
  58. #define i8042_KBD_IE        0x1
  59. #define i8042_MOUSE_IE      0x2
  60. #define i8042_KBD_DISABLE   0x10
  61. #define i8042_MOUSE_DISABLE 0x20
  62. #define i8042_KBD_TRANSLATE 0x40
  63.  
  64. /* Mouse constants */
  65. #define MOUSE_OUT_INIT  0xf4
  66. #define MOUSE_ACK       0xfa
  67.  
  68. static irq_cmd_t i8042_cmds[] = {
  69.     {
  70.         .cmd = CMD_PIO_READ_8,
  71.         .addr = NULL,   /* will be patched in run-time */
  72.         .dstarg = 1
  73.     },
  74.     {
  75.         .cmd = CMD_BTEST,
  76.         .value = i8042_OUTPUT_FULL,
  77.         .srcarg = 1,
  78.         .dstarg = 3
  79.     },
  80.     {
  81.         .cmd = CMD_PREDICATE,
  82.         .value = 2,
  83.         .srcarg = 3
  84.     },
  85.     {
  86.         .cmd = CMD_PIO_READ_8,
  87.         .addr = NULL,   /* will be patched in run-time */
  88.         .dstarg = 2
  89.     },
  90.     {
  91.         .cmd = CMD_ACCEPT
  92.     }
  93. };
  94.  
  95. static irq_code_t i8042_kbd = {
  96.     sizeof(i8042_cmds) / sizeof(irq_cmd_t),
  97.     i8042_cmds
  98. };
  99.  
  100. static uintptr_t i8042_physical;
  101. static uintptr_t i8042_kernel;
  102. static i8042_t * i8042;
  103.  
  104. static void wait_ready(void) {
  105.     while (pio_read_8(&i8042->status) & i8042_INPUT_FULL)
  106.         ;
  107. }
  108.  
  109. static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);
  110.  
  111. int kbd_port_init(void)
  112. {
  113.     int mouseenabled = 0;
  114.     void *vaddr;
  115.  
  116.     i8042_physical = sysinfo_value("kbd.address.physical");
  117.     i8042_kernel = sysinfo_value("kbd.address.kernel");
  118.     if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
  119.         return -1;
  120.     i8042 = vaddr;
  121.  
  122.     async_set_interrupt_received(i8042_irq_handler);
  123.  
  124.     /* Disable kbd, enable mouse */
  125.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  126.     wait_ready();
  127.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  128.     wait_ready();
  129.     pio_write_8(&i8042->data, i8042_KBD_DISABLE);
  130.     wait_ready();
  131.  
  132.     /* Flush all current IO */
  133.     while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
  134.         (void) pio_read_8(&i8042->data);
  135.    
  136.     /* Enable kbd */
  137.     i8042_kbd.cmds[0].addr = &((i8042_t *) i8042_kernel)->status;
  138.     i8042_kbd.cmds[3].addr = &((i8042_t *) i8042_kernel)->data;
  139.     ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"), 0, &i8042_kbd);
  140.  
  141.     int newcontrol = i8042_KBD_IE | i8042_KBD_TRANSLATE;
  142.     if (mouseenabled)
  143.         newcontrol |= i8042_MOUSE_IE;
  144.    
  145.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  146.     wait_ready();
  147.     pio_write_8(&i8042->data, newcontrol);
  148.     wait_ready();
  149.    
  150.     return 0;
  151. }
  152.  
  153. static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
  154. {
  155.     int status = IPC_GET_ARG1(*call);
  156.  
  157.     if ((status & i8042_MOUSE_DATA))
  158.         return;
  159.  
  160.     int scan_code = IPC_GET_ARG2(*call);
  161.  
  162.     kbd_push_scancode(scan_code);
  163.     return;
  164. }
  165.  
  166. /**
  167.  * @}
  168.  */
  169.