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1844 | 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 | |||
29 | /** @addtogroup genarch |
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30 | * @{ |
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31 | */ |
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32 | /** |
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33 | * @file |
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34 | * @brief NS 16550 serial port / keyboard driver. |
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35 | */ |
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36 | |||
37 | #include <genarch/kbd/ns16550.h> |
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38 | #include <genarch/kbd/key.h> |
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39 | #include <genarch/kbd/scanc.h> |
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40 | #include <genarch/kbd/scanc_sun.h> |
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41 | #include <arch/drivers/ns16550.h> |
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42 | #include <arch/interrupt.h> |
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43 | #include <cpu.h> |
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44 | #include <arch/asm.h> |
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45 | #include <arch.h> |
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46 | #include <typedefs.h> |
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47 | #include <console/chardev.h> |
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48 | #include <console/console.h> |
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49 | #include <interrupt.h> |
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50 | |||
51 | #define LSR_DATA_READY 0x01 |
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52 | |||
53 | /* |
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54 | * These codes read from ns16550 data register are silently ignored. |
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55 | */ |
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56 | #define IGNORE_CODE 0x7f /* all keys up */ |
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57 | |||
58 | static void ns16550_suspend(chardev_t *); |
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59 | static void ns16550_resume(chardev_t *); |
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60 | |||
61 | chardev_t kbrd; |
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62 | static chardev_operations_t ops = { |
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63 | .suspend = ns16550_suspend, |
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64 | .resume = ns16550_resume, |
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65 | .read = key_read |
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66 | }; |
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67 | |||
68 | void ns16550_interrupt(int n, istate_t *istate); |
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69 | void ns16550_wait(void); |
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70 | |||
71 | /** Initialize keyboard and service interrupts using kernel routine */ |
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72 | void ns16550_grab(void) |
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73 | { |
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74 | /* TODO */ |
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75 | } |
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76 | |||
77 | /** Resume the former interrupt vector */ |
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78 | void ns16550_release(void) |
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79 | { |
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80 | /* TODO */ |
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81 | } |
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82 | |||
83 | /** Initialize ns16550. */ |
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84 | void ns16550_init(void) |
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85 | { |
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86 | ns16550_grab(); |
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87 | chardev_initialize("ns16550_kbd", &kbrd, &ops); |
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88 | stdin = &kbrd; |
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89 | } |
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90 | |||
91 | /** Process ns16550 interrupt. |
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92 | * |
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93 | * @param n Interrupt vector. |
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94 | * @param istate Interrupted state. |
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95 | */ |
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96 | void ns16550_interrupt(int n, istate_t *istate) |
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97 | { |
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98 | /* TODO */ |
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99 | } |
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100 | |||
101 | /** Wait until the controller reads its data. */ |
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102 | void ns16550_wait(void) { |
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103 | } |
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104 | |||
105 | /* Called from getc(). */ |
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106 | void ns16550_resume(chardev_t *d) |
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107 | { |
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108 | } |
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109 | |||
110 | /* Called from getc(). */ |
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111 | void ns16550_suspend(chardev_t *d) |
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112 | { |
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113 | } |
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114 | |||
115 | char key_read(chardev_t *d) |
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116 | { |
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117 | char ch; |
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118 | |||
119 | while(!(ch = active_read_buff_read())) { |
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120 | uint8_t x; |
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121 | while (!(ns16550_lsr_read() & LSR_DATA_READY)) |
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122 | ; |
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123 | x = ns16550_rbr_read(); |
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124 | if (x != IGNORE_CODE) { |
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125 | if (x & KEY_RELEASE) |
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126 | key_released(x ^ KEY_RELEASE); |
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127 | else |
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128 | active_read_key_pressed(x); |
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129 | } |
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130 | } |
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131 | return ch; |
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132 | } |
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133 | |||
134 | /** Poll for key press and release events. |
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135 | * |
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136 | * This function can be used to implement keyboard polling. |
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137 | */ |
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138 | void ns16550_poll(void) |
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139 | { |
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140 | uint8_t x; |
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141 | |||
142 | while (((x = ns16550_lsr_read() & LSR_DATA_READY))) { |
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143 | x = ns16550_rbr_read(); |
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144 | if (x != IGNORE_CODE) { |
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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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152 | |||
153 | /** @} |
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154 | */ |