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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1754 | jermar | 29 | /** @addtogroup genarch |
1702 | cejka | 30 | * @{ |
31 | */ |
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1754 | jermar | 32 | /** |
1757 | jermar | 33 | * @file |
1754 | jermar | 34 | * @brief i8042 processor driver. |
35 | * |
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36 | * It takes care of low-level keyboard functions. |
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1702 | cejka | 37 | */ |
38 | |||
1842 | jermar | 39 | #include <genarch/kbd/i8042.h> |
1843 | jermar | 40 | #include <genarch/kbd/key.h> |
1842 | jermar | 41 | #include <genarch/kbd/scanc.h> |
42 | #include <genarch/kbd/scanc_pc.h> |
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894 | jermar | 43 | #include <arch/drivers/i8042.h> |
1 | jermar | 44 | #include <arch/interrupt.h> |
45 | #include <cpu.h> |
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46 | #include <arch/asm.h> |
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47 | #include <arch.h> |
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508 | jermar | 48 | #include <typedefs.h> |
511 | jermar | 49 | #include <console/chardev.h> |
50 | #include <console/console.h> |
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576 | palkovsky | 51 | #include <interrupt.h> |
1 | jermar | 52 | |
1754 | jermar | 53 | /* Keyboard commands. */ |
512 | jermar | 54 | #define KBD_ENABLE 0xf4 |
55 | #define KBD_DISABLE 0xf5 |
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56 | #define KBD_ACK 0xfa |
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57 | |||
670 | vana | 58 | /* |
893 | jermar | 59 | * 60 Write 8042 Command Byte: next data byte written to port 60h is |
895 | jermar | 60 | * placed in 8042 command register. Format: |
893 | jermar | 61 | * |
62 | * |7|6|5|4|3|2|1|0|8042 Command Byte |
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63 | * | | | | | | | `---- 1=enable output register full interrupt |
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64 | * | | | | | | `----- should be 0 |
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65 | * | | | | | `------ 1=set status register system, 0=clear |
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66 | * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit |
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67 | * | | | `-------- disable keyboard I/O by driving clock line low |
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68 | * | | `--------- disable auxiliary device, drives clock line low |
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69 | * | `---------- IBM scancode translation 0=AT, 1=PC/XT |
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70 | * `----------- reserved, should be 0 |
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71 | */ |
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670 | vana | 72 | |
893 | jermar | 73 | #define i8042_SET_COMMAND 0x60 |
1759 | palkovsky | 74 | #define i8042_COMMAND 0x69 |
894 | jermar | 75 | |
76 | #define i8042_BUFFER_FULL_MASK 0x01 |
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893 | jermar | 77 | #define i8042_WAIT_MASK 0x02 |
1759 | palkovsky | 78 | #define i8042_MOUSE_DATA 0x20 |
670 | vana | 79 | |
575 | palkovsky | 80 | static void i8042_suspend(chardev_t *); |
81 | static void i8042_resume(chardev_t *); |
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511 | jermar | 82 | |
83 | static chardev_operations_t ops = { |
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84 | .suspend = i8042_suspend, |
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878 | vana | 85 | .resume = i8042_resume, |
1896 | jermar | 86 | .read = i8042_key_read |
511 | jermar | 87 | }; |
88 | |||
958 | jermar | 89 | static void i8042_interrupt(int n, istate_t *istate); |
895 | jermar | 90 | static void i8042_wait(void); |
576 | palkovsky | 91 | |
1474 | palkovsky | 92 | static iroutine oldvector; |
93 | /** Initialize keyboard and service interrupts using kernel routine */ |
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94 | void i8042_grab(void) |
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1 | jermar | 95 | { |
1474 | palkovsky | 96 | oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt); |
895 | jermar | 97 | i8042_wait(); |
894 | jermar | 98 | i8042_command_write(i8042_SET_COMMAND); |
895 | jermar | 99 | i8042_wait(); |
894 | jermar | 100 | i8042_data_write(i8042_COMMAND); |
895 | jermar | 101 | i8042_wait(); |
1474 | palkovsky | 102 | } |
103 | /** Resume the former interrupt vector */ |
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104 | void i8042_release(void) |
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105 | { |
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106 | if (oldvector) |
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107 | exc_register(VECTOR_KBD, "user_interrupt", oldvector); |
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108 | } |
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670 | vana | 109 | |
1474 | palkovsky | 110 | /** Initialize i8042. */ |
111 | void i8042_init(void) |
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112 | { |
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113 | int i; |
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114 | |||
115 | i8042_grab(); |
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116 | /* Prevent user from accidentaly releasing calling i8042_resume |
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117 | * and disabling keyboard |
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118 | */ |
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119 | oldvector = NULL; |
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120 | |||
512 | jermar | 121 | trap_virtual_enable_irqs(1<<IRQ_KBD); |
575 | palkovsky | 122 | chardev_initialize("i8042_kbd", &kbrd, &ops); |
511 | jermar | 123 | stdin = &kbrd; |
1195 | jermar | 124 | |
1194 | vana | 125 | /* |
1195 | jermar | 126 | * Clear input buffer. |
127 | * Number of iterations is limited to prevent infinite looping. |
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128 | */ |
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129 | for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) { |
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1194 | vana | 130 | i8042_data_read(); |
1195 | jermar | 131 | } |
1 | jermar | 132 | } |
133 | |||
508 | jermar | 134 | /** Process i8042 interrupt. |
135 | * |
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136 | * @param n Interrupt vector. |
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1708 | jermar | 137 | * @param istate Interrupted state. |
508 | jermar | 138 | */ |
958 | jermar | 139 | void i8042_interrupt(int n, istate_t *istate) |
1 | jermar | 140 | { |
1780 | jermar | 141 | uint8_t x; |
142 | uint8_t status; |
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1 | jermar | 143 | |
1759 | palkovsky | 144 | while (((status=i8042_status_read()) & i8042_BUFFER_FULL_MASK)) { |
1753 | palkovsky | 145 | x = i8042_data_read(); |
1759 | palkovsky | 146 | |
147 | if ((status & i8042_MOUSE_DATA)) |
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148 | continue; |
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149 | |||
1753 | palkovsky | 150 | if (x & KEY_RELEASE) |
151 | key_released(x ^ KEY_RELEASE); |
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152 | else |
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153 | key_pressed(x); |
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154 | } |
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1 | jermar | 155 | trap_virtual_eoi(); |
156 | } |
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508 | jermar | 157 | |
895 | jermar | 158 | /** Wait until the controller reads its data. */ |
159 | void i8042_wait(void) { |
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160 | while (i8042_status_read() & i8042_WAIT_MASK) { |
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161 | /* wait */ |
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162 | } |
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163 | } |
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164 | |||
511 | jermar | 165 | /* Called from getc(). */ |
575 | palkovsky | 166 | void i8042_resume(chardev_t *d) |
511 | jermar | 167 | { |
168 | } |
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169 | |||
170 | /* Called from getc(). */ |
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575 | palkovsky | 171 | void i8042_suspend(chardev_t *d) |
511 | jermar | 172 | { |
173 | } |
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878 | vana | 174 | |
1896 | jermar | 175 | char i8042_key_read(chardev_t *d) |
878 | vana | 176 | { |
177 | char ch; |
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178 | |||
894 | jermar | 179 | while(!(ch = active_read_buff_read())) { |
1780 | jermar | 180 | uint8_t x; |
1753 | palkovsky | 181 | while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK)) |
894 | jermar | 182 | ; |
183 | x = i8042_data_read(); |
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1842 | jermar | 184 | if (x & KEY_RELEASE) |
185 | key_released(x ^ KEY_RELEASE); |
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186 | else |
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187 | active_read_key_pressed(x); |
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878 | vana | 188 | } |
189 | return ch; |
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190 | } |
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895 | jermar | 191 | |
192 | /** Poll for key press and release events. |
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193 | * |
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194 | * This function can be used to implement keyboard polling. |
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195 | */ |
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196 | void i8042_poll(void) |
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197 | { |
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1780 | jermar | 198 | uint8_t x; |
895 | jermar | 199 | |
200 | while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) { |
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201 | x = i8042_data_read(); |
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1842 | jermar | 202 | if (x & KEY_RELEASE) |
203 | key_released(x ^ KEY_RELEASE); |
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204 | else |
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205 | key_pressed(x); |
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895 | jermar | 206 | } |
207 | } |
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1702 | cejka | 208 | |
1754 | jermar | 209 | /** @} |
1702 | cejka | 210 | */ |