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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 <ddi.h>
  47. #include "i8042.h"
  48.  
  49. /* Interesting bits for status register */
  50. #define i8042_OUTPUT_FULL  0x1
  51. #define i8042_INPUT_FULL   0x2
  52. #define i8042_MOUSE_DATA   0x20
  53.  
  54. /* Command constants */
  55. #define i8042_CMD_KBD 0x60
  56. #define i8042_CMD_MOUSE  0xd4
  57.  
  58. /* Keyboard cmd byte */
  59. #define i8042_KBD_IE        0x1
  60. #define i8042_MOUSE_IE      0x2
  61. #define i8042_KBD_DISABLE   0x10
  62. #define i8042_MOUSE_DISABLE 0x20
  63. #define i8042_KBD_TRANSLATE 0x40
  64.  
  65. /* Mouse constants */
  66. #define MOUSE_OUT_INIT  0xf4
  67. #define MOUSE_ACK       0xfa
  68.  
  69. static irq_cmd_t i8042_cmds[] = {
  70.     {
  71.         .cmd = CMD_PIO_READ_8,
  72.         .addr = NULL,   /* will be patched in run-time */
  73.         .dstarg = 1
  74.     },
  75.     {
  76.         .cmd = CMD_BTEST,
  77.         .value = i8042_OUTPUT_FULL,
  78.         .srcarg = 1,
  79.         .dstarg = 3
  80.     },
  81.     {
  82.         .cmd = CMD_PREDICATE,
  83.         .value = 2,
  84.         .srcarg = 3
  85.     },
  86.     {
  87.         .cmd = CMD_PIO_READ_8,
  88.         .addr = NULL,   /* will be patched in run-time */
  89.         .dstarg = 2
  90.     },
  91.     {
  92.         .cmd = CMD_ACCEPT
  93.     }
  94. };
  95.  
  96. static irq_code_t i8042_kbd = {
  97.     sizeof(i8042_cmds) / sizeof(irq_cmd_t),
  98.     i8042_cmds
  99. };
  100.  
  101. static uintptr_t i8042_physical;
  102. static uintptr_t i8042_kernel;
  103. static i8042_t * i8042;
  104.  
  105. static void wait_ready(void) {
  106.     while (pio_read_8(&i8042->status) & i8042_INPUT_FULL)
  107.         ;
  108. }
  109.  
  110. static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);
  111.  
  112. int kbd_port_init(void)
  113. {
  114.     int mouseenabled = 0;
  115.     void *vaddr;
  116.  
  117.     i8042_physical = sysinfo_value("kbd.address.physical");
  118.     i8042_kernel = sysinfo_value("kbd.address.kernel");
  119.     if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
  120.         return -1;
  121.     i8042 = vaddr;
  122.  
  123.     async_set_interrupt_received(i8042_irq_handler);
  124.  
  125.     /* Disable kbd, enable mouse */
  126.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  127.     wait_ready();
  128.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  129.     wait_ready();
  130.     pio_write_8(&i8042->data, i8042_KBD_DISABLE);
  131.     wait_ready();
  132.  
  133.     /* Flush all current IO */
  134.     while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
  135.         (void) pio_read_8(&i8042->data);
  136.    
  137.     /* Enable kbd */
  138.     i8042_kbd.cmds[0].addr = &((i8042_t *) i8042_kernel)->status;
  139.     i8042_kbd.cmds[3].addr = &((i8042_t *) i8042_kernel)->data;
  140.     ipc_register_irq(sysinfo_value("kbd.inr"), device_assign_devno(), 0, &i8042_kbd);
  141.  
  142.     int newcontrol = i8042_KBD_IE | i8042_KBD_TRANSLATE;
  143.     if (mouseenabled)
  144.         newcontrol |= i8042_MOUSE_IE;
  145.    
  146.     pio_write_8(&i8042->status, i8042_CMD_KBD);
  147.     wait_ready();
  148.     pio_write_8(&i8042->data, newcontrol);
  149.     wait_ready();
  150.    
  151.     return 0;
  152. }
  153.  
  154. static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
  155. {
  156.     int status = IPC_GET_ARG1(*call);
  157.  
  158.     if ((status & i8042_MOUSE_DATA))
  159.         return;
  160.  
  161.     int scan_code = IPC_GET_ARG2(*call);
  162.  
  163.     kbd_push_scancode(scan_code);
  164.     return;
  165. }
  166.  
  167. /**
  168.  * @}
  169.  */
  170.