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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 <cpu.h> |
45 | #include <arch/asm.h> |
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46 | #include <arch.h> |
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508 | jermar | 47 | #include <typedefs.h> |
511 | jermar | 48 | #include <console/chardev.h> |
49 | #include <console/console.h> |
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576 | palkovsky | 50 | #include <interrupt.h> |
1956 | decky | 51 | #include <sysinfo/sysinfo.h> |
52 | #include <ddi/irq.h> |
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1 | jermar | 53 | |
1754 | jermar | 54 | /* Keyboard commands. */ |
512 | jermar | 55 | #define KBD_ENABLE 0xf4 |
56 | #define KBD_DISABLE 0xf5 |
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57 | #define KBD_ACK 0xfa |
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58 | |||
670 | vana | 59 | /* |
893 | jermar | 60 | * 60 Write 8042 Command Byte: next data byte written to port 60h is |
895 | jermar | 61 | * placed in 8042 command register. Format: |
893 | jermar | 62 | * |
63 | * |7|6|5|4|3|2|1|0|8042 Command Byte |
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64 | * | | | | | | | `---- 1=enable output register full interrupt |
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65 | * | | | | | | `----- should be 0 |
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66 | * | | | | | `------ 1=set status register system, 0=clear |
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67 | * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit |
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68 | * | | | `-------- disable keyboard I/O by driving clock line low |
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69 | * | | `--------- disable auxiliary device, drives clock line low |
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70 | * | `---------- IBM scancode translation 0=AT, 1=PC/XT |
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71 | * `----------- reserved, should be 0 |
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72 | */ |
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670 | vana | 73 | |
893 | jermar | 74 | #define i8042_SET_COMMAND 0x60 |
1759 | palkovsky | 75 | #define i8042_COMMAND 0x69 |
894 | jermar | 76 | |
77 | #define i8042_BUFFER_FULL_MASK 0x01 |
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893 | jermar | 78 | #define i8042_WAIT_MASK 0x02 |
1759 | palkovsky | 79 | #define i8042_MOUSE_DATA 0x20 |
670 | vana | 80 | |
575 | palkovsky | 81 | static void i8042_suspend(chardev_t *); |
82 | static void i8042_resume(chardev_t *); |
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511 | jermar | 83 | |
84 | static chardev_operations_t ops = { |
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85 | .suspend = i8042_suspend, |
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878 | vana | 86 | .resume = i8042_resume, |
1896 | jermar | 87 | .read = i8042_key_read |
511 | jermar | 88 | }; |
89 | |||
1956 | decky | 90 | /** Structure for i8042's IRQ. */ |
91 | static irq_t i8042_irq; |
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576 | palkovsky | 92 | |
1956 | decky | 93 | /** Wait until the controller reads its data. */ |
94 | static void i8042_wait(void) { |
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95 | while (i8042_status_read() & i8042_WAIT_MASK) { |
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96 | /* wait */ |
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97 | } |
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98 | } |
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99 | |||
1474 | palkovsky | 100 | void i8042_grab(void) |
1 | jermar | 101 | { |
1956 | decky | 102 | ipl_t ipl = interrupts_disable(); |
103 | |||
895 | jermar | 104 | i8042_wait(); |
894 | jermar | 105 | i8042_command_write(i8042_SET_COMMAND); |
895 | jermar | 106 | i8042_wait(); |
894 | jermar | 107 | i8042_data_write(i8042_COMMAND); |
895 | jermar | 108 | i8042_wait(); |
1956 | decky | 109 | |
110 | spinlock_lock(&i8042_irq.lock); |
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111 | i8042_irq.notif_cfg.notify = false; |
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112 | spinlock_unlock(&i8042_irq.lock); |
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113 | interrupts_restore(ipl); |
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1474 | palkovsky | 114 | } |
1956 | decky | 115 | |
1474 | palkovsky | 116 | void i8042_release(void) |
117 | { |
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1956 | decky | 118 | ipl_t ipl = interrupts_disable(); |
119 | spinlock_lock(&i8042_irq.lock); |
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120 | if (i8042_irq.notif_cfg.answerbox) |
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121 | i8042_irq.notif_cfg.notify = true; |
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122 | spinlock_unlock(&i8042_irq.lock); |
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123 | interrupts_restore(ipl); |
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1474 | palkovsky | 124 | } |
670 | vana | 125 | |
1956 | decky | 126 | static irq_ownership_t i8042_claim(void) |
1474 | palkovsky | 127 | { |
1956 | decky | 128 | return IRQ_ACCEPT; |
129 | } |
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1474 | palkovsky | 130 | |
1956 | decky | 131 | static void i8042_irq_handler(irq_t *irq, void *arg, ...) |
132 | { |
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133 | if (irq->notif_cfg.notify && irq->notif_cfg.answerbox) |
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134 | ipc_irq_send_notif(irq); |
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135 | else { |
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136 | uint8_t x; |
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137 | uint8_t status; |
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138 | |||
139 | while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) { |
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140 | x = i8042_data_read(); |
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141 | |||
142 | if ((status & i8042_MOUSE_DATA)) |
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143 | continue; |
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144 | |||
145 | if (x & KEY_RELEASE) |
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146 | key_released(x ^ KEY_RELEASE); |
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147 | else |
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148 | key_pressed(x); |
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149 | } |
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150 | } |
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151 | } |
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1474 | palkovsky | 152 | |
1956 | decky | 153 | /** Initialize i8042. */ |
154 | void i8042_init(devno_t devno, inr_t inr) |
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155 | { |
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575 | palkovsky | 156 | chardev_initialize("i8042_kbd", &kbrd, &ops); |
511 | jermar | 157 | stdin = &kbrd; |
1956 | decky | 158 | |
159 | irq_initialize(&i8042_irq); |
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160 | i8042_irq.devno = devno; |
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161 | i8042_irq.inr = inr; |
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162 | i8042_irq.claim = i8042_claim; |
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163 | i8042_irq.handler = i8042_irq_handler; |
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164 | irq_register(&i8042_irq); |
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165 | |||
166 | trap_virtual_enable_irqs(1 << inr); |
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167 | |||
1194 | vana | 168 | /* |
1195 | jermar | 169 | * Clear input buffer. |
170 | * Number of iterations is limited to prevent infinite looping. |
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171 | */ |
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1956 | decky | 172 | int i; |
1195 | jermar | 173 | for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) { |
1194 | vana | 174 | i8042_data_read(); |
1753 | palkovsky | 175 | } |
1956 | decky | 176 | |
177 | sysinfo_set_item_val("kbd", NULL, true); |
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178 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
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179 | sysinfo_set_item_val("kbd.inr", NULL, inr); |
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180 | |||
181 | i8042_grab(); |
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1 | jermar | 182 | } |
508 | jermar | 183 | |
511 | jermar | 184 | /* Called from getc(). */ |
575 | palkovsky | 185 | void i8042_resume(chardev_t *d) |
511 | jermar | 186 | { |
187 | } |
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188 | |||
189 | /* Called from getc(). */ |
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575 | palkovsky | 190 | void i8042_suspend(chardev_t *d) |
511 | jermar | 191 | { |
192 | } |
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878 | vana | 193 | |
1896 | jermar | 194 | char i8042_key_read(chardev_t *d) |
878 | vana | 195 | { |
196 | char ch; |
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197 | |||
894 | jermar | 198 | while(!(ch = active_read_buff_read())) { |
1780 | jermar | 199 | uint8_t x; |
1753 | palkovsky | 200 | while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK)) |
894 | jermar | 201 | ; |
202 | x = i8042_data_read(); |
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1842 | jermar | 203 | if (x & KEY_RELEASE) |
204 | key_released(x ^ KEY_RELEASE); |
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205 | else |
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206 | active_read_key_pressed(x); |
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878 | vana | 207 | } |
208 | return ch; |
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209 | } |
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895 | jermar | 210 | |
211 | /** Poll for key press and release events. |
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212 | * |
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213 | * This function can be used to implement keyboard polling. |
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214 | */ |
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215 | void i8042_poll(void) |
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216 | { |
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1780 | jermar | 217 | uint8_t x; |
895 | jermar | 218 | |
219 | while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) { |
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220 | x = i8042_data_read(); |
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1842 | jermar | 221 | if (x & KEY_RELEASE) |
222 | key_released(x ^ KEY_RELEASE); |
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223 | else |
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224 | key_pressed(x); |
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895 | jermar | 225 | } |
226 | } |
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1702 | cejka | 227 | |
1754 | jermar | 228 | /** @} |
1702 | cejka | 229 | */ |