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1844 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2001-2006 Jakub Jermar |
1844 | jermar | 3 | * All rights reserved. |
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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1931 | jermar | 41 | #include <arch/drivers/kbd.h> |
1844 | jermar | 42 | #include <arch/drivers/ns16550.h> |
1920 | jermar | 43 | #include <ddi/irq.h> |
1931 | jermar | 44 | #include <ipc/irq.h> |
1844 | jermar | 45 | #include <cpu.h> |
46 | #include <arch/asm.h> |
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47 | #include <arch.h> |
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48 | #include <typedefs.h> |
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49 | #include <console/chardev.h> |
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50 | #include <console/console.h> |
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51 | #include <interrupt.h> |
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1931 | jermar | 52 | #include <arch/interrupt.h> |
1880 | jermar | 53 | #include <sysinfo/sysinfo.h> |
1931 | jermar | 54 | #include <synch/spinlock.h> |
1844 | jermar | 55 | |
56 | #define LSR_DATA_READY 0x01 |
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57 | |||
1921 | jermar | 58 | /** Structure representing the ns16550. */ |
59 | static ns16550_t ns16550; |
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60 | |||
61 | /** Structure for ns16550's IRQ. */ |
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62 | static irq_t ns16550_irq; |
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63 | |||
1844 | jermar | 64 | /* |
65 | * These codes read from ns16550 data register are silently ignored. |
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66 | */ |
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67 | #define IGNORE_CODE 0x7f /* all keys up */ |
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68 | |||
69 | static void ns16550_suspend(chardev_t *); |
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70 | static void ns16550_resume(chardev_t *); |
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71 | |||
72 | static chardev_operations_t ops = { |
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73 | .suspend = ns16550_suspend, |
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74 | .resume = ns16550_resume, |
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1896 | jermar | 75 | .read = ns16550_key_read |
1844 | jermar | 76 | }; |
77 | |||
1931 | jermar | 78 | void ns16550_interrupt(void); |
1844 | jermar | 79 | |
80 | /** Initialize keyboard and service interrupts using kernel routine */ |
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81 | void ns16550_grab(void) |
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82 | { |
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1944 | jermar | 83 | ipl_t ipl = interrupts_disable(); |
84 | |||
1931 | jermar | 85 | ns16550_ier_write(&ns16550, IER_ERBFI); /* enable receiver interrupt */ |
86 | |||
87 | while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) |
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88 | (void) ns16550_rbr_read(&ns16550); |
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89 | |||
1944 | jermar | 90 | spinlock_lock(&ns16550_irq.lock); |
1932 | jermar | 91 | ns16550_irq.notif_cfg.notify = false; |
1944 | jermar | 92 | spinlock_unlock(&ns16550_irq.lock); |
93 | interrupts_restore(ipl); |
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1844 | jermar | 94 | } |
95 | |||
96 | /** Resume the former interrupt vector */ |
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97 | void ns16550_release(void) |
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98 | { |
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1944 | jermar | 99 | ipl_t ipl = interrupts_disable(); |
100 | spinlock_lock(&ns16550_irq.lock); |
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1932 | jermar | 101 | if (ns16550_irq.notif_cfg.answerbox) |
102 | ns16550_irq.notif_cfg.notify = true; |
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1944 | jermar | 103 | spinlock_unlock(&ns16550_irq.lock); |
104 | interrupts_restore(ipl); |
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1844 | jermar | 105 | } |
106 | |||
1921 | jermar | 107 | /** Initialize ns16550. |
108 | * |
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109 | * @param devno Device number. |
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110 | * @param inr Interrupt number. |
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111 | * @param vaddr Virtual address of device's registers. |
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112 | */ |
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113 | void ns16550_init(devno_t devno, inr_t inr, uintptr_t vaddr) |
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1844 | jermar | 114 | { |
115 | chardev_initialize("ns16550_kbd", &kbrd, &ops); |
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116 | stdin = &kbrd; |
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1880 | jermar | 117 | |
1921 | jermar | 118 | ns16550.devno = devno; |
119 | ns16550.reg = (uint8_t *) vaddr; |
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120 | |||
121 | irq_initialize(&ns16550_irq); |
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122 | ns16550_irq.devno = devno; |
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123 | ns16550_irq.inr = inr; |
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124 | ns16550_irq.claim = ns16550_claim; |
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125 | ns16550_irq.handler = ns16550_irq_handler; |
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126 | irq_register(&ns16550_irq); |
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127 | |||
1880 | jermar | 128 | sysinfo_set_item_val("kbd", NULL, true); |
1931 | jermar | 129 | sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550); |
1921 | jermar | 130 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
131 | sysinfo_set_item_val("kbd.inr", NULL, inr); |
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132 | sysinfo_set_item_val("kbd.address.virtual", NULL, vaddr); |
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1911 | jermar | 133 | |
1931 | jermar | 134 | ns16550_grab(); |
1844 | jermar | 135 | } |
136 | |||
1931 | jermar | 137 | /** Process ns16550 interrupt. */ |
138 | void ns16550_interrupt(void) |
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1844 | jermar | 139 | { |
1931 | jermar | 140 | /* TODO |
141 | * |
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142 | * ns16550 works in the polled mode so far. |
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143 | */ |
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1844 | jermar | 144 | } |
145 | |||
146 | /* Called from getc(). */ |
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147 | void ns16550_resume(chardev_t *d) |
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148 | { |
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149 | } |
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150 | |||
151 | /* Called from getc(). */ |
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152 | void ns16550_suspend(chardev_t *d) |
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153 | { |
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154 | } |
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155 | |||
1896 | jermar | 156 | char ns16550_key_read(chardev_t *d) |
1844 | jermar | 157 | { |
158 | char ch; |
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159 | |||
160 | while(!(ch = active_read_buff_read())) { |
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161 | uint8_t x; |
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1921 | jermar | 162 | while (!(ns16550_lsr_read(&ns16550) & LSR_DATA_READY)) |
1844 | jermar | 163 | ; |
1921 | jermar | 164 | x = ns16550_rbr_read(&ns16550); |
1844 | jermar | 165 | if (x != IGNORE_CODE) { |
166 | if (x & KEY_RELEASE) |
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167 | key_released(x ^ KEY_RELEASE); |
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168 | else |
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169 | active_read_key_pressed(x); |
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170 | } |
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171 | } |
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172 | return ch; |
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173 | } |
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174 | |||
175 | /** Poll for key press and release events. |
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176 | * |
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177 | * This function can be used to implement keyboard polling. |
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178 | */ |
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179 | void ns16550_poll(void) |
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180 | { |
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1931 | jermar | 181 | ipl_t ipl; |
1844 | jermar | 182 | |
1931 | jermar | 183 | ipl = interrupts_disable(); |
184 | spinlock_lock(&ns16550_irq.lock); |
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185 | |||
186 | if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) { |
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1932 | jermar | 187 | if (ns16550_irq.notif_cfg.notify && ns16550_irq.notif_cfg.answerbox) { |
1931 | jermar | 188 | /* |
189 | * Send IPC notification. |
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190 | */ |
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191 | ipc_irq_send_notif(&ns16550_irq); |
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192 | spinlock_unlock(&ns16550_irq.lock); |
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193 | interrupts_restore(ipl); |
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194 | return; |
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195 | } |
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196 | } |
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197 | |||
198 | spinlock_unlock(&ns16550_irq.lock); |
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199 | interrupts_restore(ipl); |
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200 | |||
1921 | jermar | 201 | while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) { |
1931 | jermar | 202 | uint8_t x; |
203 | |||
1921 | jermar | 204 | x = ns16550_rbr_read(&ns16550); |
1844 | jermar | 205 | if (x != IGNORE_CODE) { |
206 | if (x & KEY_RELEASE) |
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207 | key_released(x ^ KEY_RELEASE); |
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208 | else |
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209 | key_pressed(x); |
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210 | } |
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211 | } |
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212 | } |
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213 | |||
1919 | jermar | 214 | irq_ownership_t ns16550_claim(void) |
215 | { |
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1931 | jermar | 216 | return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY); |
1919 | jermar | 217 | } |
218 | |||
219 | void ns16550_irq_handler(irq_t *irq, void *arg, ...) |
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220 | { |
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1931 | jermar | 221 | panic("Not yet implemented, ns16550 works in polled mode.\n"); |
1919 | jermar | 222 | } |
223 | |||
1844 | jermar | 224 | /** @} |
225 | */ |