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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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1880 | jermar | 50 | #include <sysinfo/sysinfo.h> |
1844 | jermar | 51 | |
52 | #define LSR_DATA_READY 0x01 |
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53 | |||
54 | /* |
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55 | * These codes read from ns16550 data register are silently ignored. |
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56 | */ |
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57 | #define IGNORE_CODE 0x7f /* all keys up */ |
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58 | |||
59 | static void ns16550_suspend(chardev_t *); |
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60 | static void ns16550_resume(chardev_t *); |
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61 | |||
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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1896 | jermar | 65 | .read = ns16550_key_read |
1844 | jermar | 66 | }; |
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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1880 | jermar | 89 | |
90 | sysinfo_set_item_val("kbd", NULL, true); |
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91 | sysinfo_set_item_val("kbd.irq", NULL, 0); |
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92 | sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address); |
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1911 | jermar | 93 | |
94 | ns16550_ier_write(IER_ERBFI); /* enable receiver interrupt */ |
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95 | |||
96 | while (ns16550_lsr_read() & LSR_DATA_READY) |
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97 | (void) ns16550_rbr_read(); |
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1844 | jermar | 98 | } |
99 | |||
100 | /** Process ns16550 interrupt. |
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101 | * |
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102 | * @param n Interrupt vector. |
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103 | * @param istate Interrupted state. |
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104 | */ |
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105 | void ns16550_interrupt(int n, istate_t *istate) |
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106 | { |
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107 | /* TODO */ |
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108 | } |
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109 | |||
110 | /** Wait until the controller reads its data. */ |
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1888 | jermar | 111 | void ns16550_wait(void) |
112 | { |
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1844 | jermar | 113 | } |
114 | |||
115 | /* Called from getc(). */ |
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116 | void ns16550_resume(chardev_t *d) |
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117 | { |
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118 | } |
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119 | |||
120 | /* Called from getc(). */ |
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121 | void ns16550_suspend(chardev_t *d) |
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122 | { |
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123 | } |
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124 | |||
1896 | jermar | 125 | char ns16550_key_read(chardev_t *d) |
1844 | jermar | 126 | { |
127 | char ch; |
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128 | |||
129 | while(!(ch = active_read_buff_read())) { |
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130 | uint8_t x; |
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131 | while (!(ns16550_lsr_read() & LSR_DATA_READY)) |
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132 | ; |
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133 | x = ns16550_rbr_read(); |
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134 | if (x != IGNORE_CODE) { |
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135 | if (x & KEY_RELEASE) |
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136 | key_released(x ^ KEY_RELEASE); |
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137 | else |
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138 | active_read_key_pressed(x); |
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139 | } |
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140 | } |
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141 | return ch; |
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142 | } |
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143 | |||
144 | /** Poll for key press and release events. |
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145 | * |
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146 | * This function can be used to implement keyboard polling. |
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147 | */ |
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148 | void ns16550_poll(void) |
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149 | { |
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150 | uint8_t x; |
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151 | |||
1911 | jermar | 152 | while (ns16550_lsr_read() & LSR_DATA_READY) { |
1844 | jermar | 153 | x = ns16550_rbr_read(); |
154 | if (x != IGNORE_CODE) { |
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155 | if (x & KEY_RELEASE) |
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156 | key_released(x ^ KEY_RELEASE); |
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157 | else |
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158 | key_pressed(x); |
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159 | } |
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160 | } |
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161 | } |
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162 | |||
163 | /** @} |
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164 | */ |