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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 |
1842 | jermar | 34 | * @brief Zilog 8530 serial port / keyboard driver. |
1754 | jermar | 35 | * |
1842 | jermar | 36 | * Note that this file is derived from the i8042.c. |
37 | * The i8042 driver could be persuaded to control |
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38 | * the z8530 at least in the polling mode. |
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39 | * As a result, this file may contain inaccurate |
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40 | * and z8530-irrelevant constants, code and comments. |
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41 | * Still it miraculously works. |
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1702 | cejka | 42 | */ |
43 | |||
1842 | jermar | 44 | #include <genarch/kbd/z8530.h> |
1843 | jermar | 45 | #include <genarch/kbd/key.h> |
1842 | jermar | 46 | #include <genarch/kbd/scanc.h> |
47 | #include <genarch/kbd/scanc_sun.h> |
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48 | #include <arch/drivers/z8530.h> |
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1 | jermar | 49 | #include <arch/interrupt.h> |
50 | #include <cpu.h> |
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51 | #include <arch/asm.h> |
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52 | #include <arch.h> |
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508 | jermar | 53 | #include <typedefs.h> |
511 | jermar | 54 | #include <console/chardev.h> |
55 | #include <console/console.h> |
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576 | palkovsky | 56 | #include <interrupt.h> |
1 | jermar | 57 | |
1754 | jermar | 58 | /* Keyboard commands. */ |
512 | jermar | 59 | #define KBD_ENABLE 0xf4 |
60 | #define KBD_DISABLE 0xf5 |
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61 | #define KBD_ACK 0xfa |
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62 | |||
670 | vana | 63 | /* |
893 | jermar | 64 | * 60 Write 8042 Command Byte: next data byte written to port 60h is |
895 | jermar | 65 | * placed in 8042 command register. Format: |
893 | jermar | 66 | * |
67 | * |7|6|5|4|3|2|1|0|8042 Command Byte |
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68 | * | | | | | | | `---- 1=enable output register full interrupt |
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69 | * | | | | | | `----- should be 0 |
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70 | * | | | | | `------ 1=set status register system, 0=clear |
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71 | * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit |
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72 | * | | | `-------- disable keyboard I/O by driving clock line low |
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73 | * | | `--------- disable auxiliary device, drives clock line low |
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74 | * | `---------- IBM scancode translation 0=AT, 1=PC/XT |
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75 | * `----------- reserved, should be 0 |
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76 | */ |
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670 | vana | 77 | |
1842 | jermar | 78 | #define z8530_SET_COMMAND 0x60 |
79 | #define z8530_COMMAND 0x69 |
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894 | jermar | 80 | |
1842 | jermar | 81 | #define z8530_BUFFER_FULL_MASK 0x01 |
82 | #define z8530_WAIT_MASK 0x02 |
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83 | #define z8530_MOUSE_DATA 0x20 |
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670 | vana | 84 | |
1842 | jermar | 85 | /* |
86 | * These codes read from z8530 data register are silently ignored. |
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895 | jermar | 87 | */ |
1842 | jermar | 88 | #define IGNORE_CODE 0x7f /* all keys up */ |
895 | jermar | 89 | |
1842 | jermar | 90 | static void z8530_suspend(chardev_t *); |
91 | static void z8530_resume(chardev_t *); |
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511 | jermar | 92 | |
1843 | jermar | 93 | chardev_t kbrd; |
511 | jermar | 94 | static chardev_operations_t ops = { |
1842 | jermar | 95 | .suspend = z8530_suspend, |
96 | .resume = z8530_resume, |
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878 | vana | 97 | .read = key_read |
511 | jermar | 98 | }; |
99 | |||
1842 | jermar | 100 | static void z8530_interrupt(int n, istate_t *istate); |
101 | static void z8530_wait(void); |
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576 | palkovsky | 102 | |
1474 | palkovsky | 103 | static iroutine oldvector; |
104 | /** Initialize keyboard and service interrupts using kernel routine */ |
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1842 | jermar | 105 | void z8530_grab(void) |
1 | jermar | 106 | { |
1842 | jermar | 107 | oldvector = exc_register(VECTOR_KBD, "z8530_interrupt", (iroutine) z8530_interrupt); |
108 | z8530_wait(); |
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109 | z8530_command_write(z8530_SET_COMMAND); |
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110 | z8530_wait(); |
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111 | z8530_data_write(z8530_COMMAND); |
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112 | z8530_wait(); |
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1474 | palkovsky | 113 | } |
114 | /** Resume the former interrupt vector */ |
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1842 | jermar | 115 | void z8530_release(void) |
1474 | palkovsky | 116 | { |
117 | if (oldvector) |
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118 | exc_register(VECTOR_KBD, "user_interrupt", oldvector); |
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119 | } |
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670 | vana | 120 | |
1842 | jermar | 121 | /** Initialize z8530. */ |
122 | void z8530_init(void) |
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1474 | palkovsky | 123 | { |
124 | int i; |
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125 | |||
1842 | jermar | 126 | z8530_grab(); |
127 | /* Prevent user from accidentaly releasing calling z8530_resume |
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1474 | palkovsky | 128 | * and disabling keyboard |
129 | */ |
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130 | oldvector = NULL; |
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131 | |||
512 | jermar | 132 | trap_virtual_enable_irqs(1<<IRQ_KBD); |
1842 | jermar | 133 | chardev_initialize("z8530_kbd", &kbrd, &ops); |
511 | jermar | 134 | stdin = &kbrd; |
1195 | jermar | 135 | |
1194 | vana | 136 | /* |
1195 | jermar | 137 | * Clear input buffer. |
138 | * Number of iterations is limited to prevent infinite looping. |
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139 | */ |
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1842 | jermar | 140 | for (i = 0; (z8530_status_read() & z8530_BUFFER_FULL_MASK) && i < 100; i++) { |
141 | z8530_data_read(); |
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1195 | jermar | 142 | } |
1 | jermar | 143 | } |
144 | |||
1842 | jermar | 145 | /** Process z8530 interrupt. |
508 | jermar | 146 | * |
147 | * @param n Interrupt vector. |
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1708 | jermar | 148 | * @param istate Interrupted state. |
508 | jermar | 149 | */ |
1842 | jermar | 150 | void z8530_interrupt(int n, istate_t *istate) |
1 | jermar | 151 | { |
1780 | jermar | 152 | uint8_t x; |
153 | uint8_t status; |
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1 | jermar | 154 | |
1842 | jermar | 155 | while (((status=z8530_status_read()) & z8530_BUFFER_FULL_MASK)) { |
156 | x = z8530_data_read(); |
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1759 | palkovsky | 157 | |
1842 | jermar | 158 | if ((status & z8530_MOUSE_DATA)) |
1759 | palkovsky | 159 | continue; |
160 | |||
1753 | palkovsky | 161 | if (x & KEY_RELEASE) |
162 | key_released(x ^ KEY_RELEASE); |
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163 | else |
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164 | key_pressed(x); |
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165 | } |
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1 | jermar | 166 | trap_virtual_eoi(); |
167 | } |
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508 | jermar | 168 | |
895 | jermar | 169 | /** Wait until the controller reads its data. */ |
1842 | jermar | 170 | void z8530_wait(void) { |
171 | while (z8530_status_read() & z8530_WAIT_MASK) { |
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895 | jermar | 172 | /* wait */ |
173 | } |
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174 | } |
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175 | |||
511 | jermar | 176 | /* Called from getc(). */ |
1842 | jermar | 177 | void z8530_resume(chardev_t *d) |
511 | jermar | 178 | { |
179 | } |
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180 | |||
181 | /* Called from getc(). */ |
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1842 | jermar | 182 | void z8530_suspend(chardev_t *d) |
511 | jermar | 183 | { |
184 | } |
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878 | vana | 185 | |
1843 | jermar | 186 | char key_read(chardev_t *d) |
878 | vana | 187 | { |
188 | char ch; |
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189 | |||
894 | jermar | 190 | while(!(ch = active_read_buff_read())) { |
1780 | jermar | 191 | uint8_t x; |
1842 | jermar | 192 | while (!(z8530_status_read() & z8530_BUFFER_FULL_MASK)) |
894 | jermar | 193 | ; |
1842 | jermar | 194 | x = z8530_data_read(); |
895 | jermar | 195 | if (x != IGNORE_CODE) { |
196 | if (x & KEY_RELEASE) |
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197 | key_released(x ^ KEY_RELEASE); |
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198 | else |
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199 | active_read_key_pressed(x); |
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200 | } |
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878 | vana | 201 | } |
202 | return ch; |
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203 | } |
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895 | jermar | 204 | |
205 | /** Poll for key press and release events. |
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206 | * |
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207 | * This function can be used to implement keyboard polling. |
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208 | */ |
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1842 | jermar | 209 | void z8530_poll(void) |
895 | jermar | 210 | { |
1780 | jermar | 211 | uint8_t x; |
895 | jermar | 212 | |
1842 | jermar | 213 | while (((x = z8530_status_read() & z8530_BUFFER_FULL_MASK))) { |
214 | x = z8530_data_read(); |
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895 | jermar | 215 | if (x != IGNORE_CODE) { |
216 | if (x & KEY_RELEASE) |
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217 | key_released(x ^ KEY_RELEASE); |
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218 | else |
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219 | key_pressed(x); |
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220 | } |
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221 | } |
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222 | } |
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1702 | cejka | 223 | |
1754 | jermar | 224 | /** @} |
1702 | cejka | 225 | */ |